The 15 Best Places to Buy Patio Furniture and Outdoor Furniture Online

Though it's on the more expensive side, Crate and Barrel has some gorgeous outdoor furniture that is worth investing in. You will find everything from loungers to pillows to planters that are all weather-resistant. Plus, with a ton of matching pieces, it's a great place to look for inspiration as well.

Why is a rifle barrel rifled?

To impart spin to the bullet so it may be gyroscopically stabilized, thus promoting accuracy

vidal sassoon 3 barrel waver?

My friend bought this and we tried it as soon as we got back to the house... at first it did not seem to work, but then it sorta worked...needless to say it is not great, you can do better curls with a curling iron, I would not waste you money. I give it a thumbs down!!.

How is a airguns barrel rifled?

when you say it's smooth (most rifling should be smooth to an extent) do you mean it does not have the lands and grooves of a traditionally rifled barrel I.E. is it Polygonal rifling? Rifling can be done in a number of different methods, the man above is indeed correct, broached rifling is done by passing a broaching tool down a barrel blank. But there is also the process of hammer forging, where a blank is cold hammered around a mandrel which contains the reverse image of the rifling you are trying to create. Hammer forged barrels are quite common in airguns. A new method being used over this side of the pond for airguns is a smooth bore barrel with the last few inches of the barrel being pressed from the outside to produce Polygonal rifling over the last few inches, which in theory is all that's needed to stabilize an airgun pellet in a moderately powered airgun.

Barrel racers - advice? Show name opinions?

You could do a few could smooch/kiss at him, or you could pack a whip a d just flag it at him like they do on the track. My mom has a gelding who does not like whips so all you have to do is flag it a few times and he knows what to do. Also when your at home practice getting him to move out. When I smooch my horses better me moving....and when I am in a run and smooch they better speed up. When at home if they do not and get lazy they get lit up for being lazy. So after they learn what a smooch means they know not to waste time in moving. Also if he has not been on the pattern long running wise be is not really going to know how to move out so it will take time. So you migh have to learn a bit of patience....all part of the training process. And do not let him get away with broncing out when you kick, pack an over and under and lite him up I do not care if he WAS abused it does not make that acceptable. He just has your number...

Barrel of Water riddle? REALLY HARD.?

The level water should be marked on the container used to add the 1 gallon of water into the barrel. Now drill a hole in the barrel and when the water pours out collect your gallon of water in the same container by filling it up to the mark you had made earlier!!!

How many barrels of water required to refine a barrel of average crude oil?

You can refine a barrel of oil without any water but sometimes it is more economic to do so. In those cases, the amount of water is very small closer to a gallon or two per barrel

Does barrel length matter for handguns?

As far as I know depending on the state you live in, sellers could only sell guns up to a certain measurement of barrel length, for a fact if you want a shrub nose on a revolver, you might need a permit. All i know is that shotgun's barrels have to be long otherwise you would be carrying a legal weapon with and illegal mod. Investigate the weapon of your choise and investigate the barrel length requirements in your state.

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I Am in Search of a Barrel Racing Saddle....?
I Am in Search of a Barrel Racing Saddle....?
Billy Cook is the kind I have, but I do not know where to get them, they are really good though. They are for sale on and lots of other catalogs like that, but they are expensive. They have return policies though if you do not like it. Just make sure if you buy a cheap one that it is good quality and wo not fall apart1. I'm trying to understand double barrel "Regulation" better. Does it mean that if I point a double barrel?double shotguns are not the best choice for slug guns. Folks think that slugs can damage the rib and the way a double (o/U or SxS) is made ... some wont handle slug pressures. Doubles and regulation... remember-they are made to deliver shot loads. If you fire the barrels at the same point of aim... the shot patterns should overlap...sort of a figure 8 shaped shot dispersion. dont expect a double shotgun to "cloverleaf' slugs2. Airsoft SCAR inner barrel length?Echo 1 Scar H3. Was the MG-42 barrel change a simple process?Using a specially made heat resistant mitt, the ammo bearer could quickly replace the barrel of a MG-42 in a matter of 3 seconds.all he has to do is lift the barrel locking tray, and pull out the barrel.Was the MG-42 barrel change a simple process?.4. What does a flatline barrel do for me?Like nerdcore said, it wo not add distance to your gun, and at farther distances, chances are it wo not break. However he's wrong when he says it does not improve accuracy. I have shot my uncles tippmann A5 with a my other cousins flatline on it (he needed a new barrel so my cousin let him borrow it), and that baby floats. It slows down the fps a good bit, but it's kinda wierd just how straight it shoots for how far. But if you guys only call paint hits, or if the other people are untruthful. It's not really necessary, and even if it is more accurate, it's slower so there's a lesser chance of it breaking on impact.5. Hypothetical question about extremely short shotgun barrel?Its spread would probably be so bad it would not have enough force to do anything. You would get a lot of flash and bang but no real damage dealing. A barrel needs to be long enough for the powder to burn in and produce the velocity that gives the shell its lethality. So basically too short and you get nothing6. rochester bc 1 barrel carb with choke thermostat?the hardest part is running the choke cable, right along with your throttle, jc whitney will probably have just what you need, but go back a few years to like 64 or 65 for the length you need and when manual choke was the norm7. what is a "screwed barrel"?difficult stuff. check out using a search engine. that will could actually help!8. Anyone have the recipe for Cracker Barrel cole slaw?Pickle Barrel Coleslaw Recipe9. New law (tax) for oil companies...your thoughts?I would love to see the big oil companies brought down to their knees as much as the next guy. Everyone has a good point though, about the tax being passed on to the consumer. What they need to do is institute this new tax and couple it with a cap to cut off price gouging. (definition of oil company price gouging: the price per barrel of oil goes up & the price of gas also goes up, but when the price per barrel drops, the price of gas stays the same.) *** How come the oil companies are treated like 'God'? - untouchable***10. Can police determine a specific brand and model of a murder weapon just by close examination of a bullet? Or is it just a fictional thing that makes cop shows more interesting?Short answer is that such is less than depicted by TV and movie fiction, but often the likely maker of the firearm can be determined by just examining the recovered bullet.Some gun makers have a distinctive style of barrel boring and rifling that is only rarely replicated by any other barrel makers, if at all
How to Make the Perfect Bed in Minutes - Infobarrel
A neat, well-made bed can create the most impressive statement.Here's how to transform your own into showroom-beautiful (and all you need are a fitted sheet, a flat sheet and a blanket):Put on the fitted sheet-To get each corner to slip on easily and stay in place, start by covering one corner at the head of the bed. Then, do the opposite corner at the foot (on the diagonal). Do the same for the other two corners.Add the flat sheet-Put the flat sheet on the bed face-down. Why Later, when you cuff the top sheet at the head of the bed, the border will show.Tuck the flat sheet-Next, tuck the base of the flat sheet into the foot of the bed. Then pull the sheet toward the head of the bed and smooth the sides.Tuck the corners-After tucking the sheet in at the foot, tuck the excess from the foot into the side. Then, tuck the side flap in. The idea is to make a pleat at the corners.Top with the blanket-To add a blanket, start by tucking it in at the foot of the bed. Then, fold the sheet and blanket together at the sides and head of the bed. For the best look, allow for a 10" cuff at the head.For a great way to give your sheets or comforters a boost, try a quick ribbon trim. Simply attach a length of ribbon using iron-on fusible (available at craft stores).Here's some inexpensive and easy ways to make your bed a showcase:To create a rich-looking canopy, mount a standard 24"-30" curtain rod to the wall. Then, slide a pair of standard curtain panels or even twin sheets on to the pole.Show off a folding screen by sliding it behind the head of your bed. For a boost of natural beauty, hang a few stems from the screen.For updated, yet rustic flair, just line up a few 6"-wide pine planks to create a fence-like headboard that's a real attention-getter.Add a touch of romance with a drape of mosquito netting. Then pin on some daisy appliquÃs (available from a craft store) for a bit of pizzazz and color.Use standard shutters as a headboard alternative. You can give the shutters a softer look by draping them with a sheer panel.
Bed Bug Prevention and Control - Infobarrel
The best way to avoid bed bugs is bed bug prevention. There are several ways to prevent bed bugs or at least try to prevent them. Most people don't think that they can get bed bugs. They tend to believe that you have to be unsanitary or dirty to get bed bugs. This is because people have been saying it forever, but the problem is that it isn't true. It doesn't matter how clean you are you can still get bed bugs. It's not a matter of cleanliness it's a problem of awareness. People aren't aware of how to get bed bugs in the first place. Therefore, they don't know what to look for or even know that they should be looking.To ensure bed bug prevention you need to be vigilant in taking precautions necessary. One of the easiest ways to prevent bed bugs is to invest in a bed bug mattress cover. They zip on and keep the pesky bugs from getting embedded into the mattress where they love to live. They love it there because they know that you're not far away. They're lazy and smart. Also, put two sided tape on the legs of the beds, so that they will get stuck trying to climb up. In addition, keep bedding from touching the floor.Get the vacuum cleaner going and use those attachments that you hate taking off and on. Vacuum everything that is vacuumable (is that a word). Do it often did I mention do it often Also, get rid of the bag don't leave it in the house. While vacuuming and cleaning use a flashlight and do frequent inspections bed bugs hate light and thrive in warm, dark places. Oh, and let the sunshine in as much as possible.Bed Bug Prevention- TravelingBring a bed bug mattress cover with you and use it in every place you stay. When you put the mattress cover on inspect the mattress closely in the seams and look for tears etc. Look for small dark dots which are feces of the bed bug; dried blood. Inspect the sheets and beds covers, even if they did put clean ones on the bugs get restless and start looking for new blood.Don't sit luggage on the floor, but instead put it on a chair or in the closet. Do likewise with your clothes and everything else in the suitcase. Once the suitcase is empty zip it back up. Bed bug prevention requires thought and staying a step ahead of hungry bed bugs. Did you know that a bed bug can live up to a year without food or water They might be pretty hungry by the time they get to you.When you get home from a trip or vacation vacuum luggage and wash clothing in very hot water and send suits to the cleaners. Inspect purse thoroughly, dump it out and really get a good look. Bed bugs can flatten out and hide easily in tight places.There are a few other places worth mentioning and they are movie theaters, garage sales and thrift stores. Movie theaters are dark and you sit still for about 2 hours giving bed bugs opportunity. Used clothing and furniture can have bed bugs hiding in them. Inspect carefully and wash with very hot water or steam clean with a fabric steamer. Bed bugs are hitchhikers and take a ride any way they can.Bed Bug Prevention- ControlAll of the tips for bed bug prevention help to control them as well. To add to these you first need to purchase bed bug insecticide dust. Apply bed bug dust to cracks and crevices throughout the home. Sprinkle a light dusting on the mattress. Don't worry there are natural and organic bed bug dust products that are eco friendly that kill bed bugs and their eggs.Keep your home uncluttered the more clutter the easier it is for bed bugs to hide. For bed bug control to be effective get rid of unnecessary junk that you haven't used in months possibly years. I know all you pack rats shudder at the thought, but would you rather risk bed bug infestationConsider a bed bug kit at home just in case you really do discover bed bugs. This way you have something there to attack them right away. After all, they do attack you don't they Bed bug kits are available online and at hardware stores everywhere.One thing for sure is that bed bug prevention means you need to be proactive and vigilant. Don't get caught off guard and end up paying hundreds of dollars for bed bug extermination. Not to mention all the work involved in preparation for exterminators to treat the home. It is also very stressful to deal with bed bug infestation and removal. Take action now to prevent bed bugs.Articles of interest:Dangers of Bed Bugs
Introduction to Mayline Drafting Tables - Infobarrel
Mayline drafting tables are some high quality drafting tables (also known as drawing boards, drawing tables, or architect's tables) that are used by artists and architects alike. These are open, multi-purpose desks that can be used for a wide array of drawings and projects. From inventors to architects to drawers and artists, there are many uses for these desks. While antique drafting tables have a special emphasis on actual drawing, modern versions like the Mayline drafting table are truly multi-purpose, and even often come with side sections that can support computers and other modern technology - making these products extremely useful and adaptable for a wide array of consumers.Brief History of Mayline Drafting TablesMayline drafting tables continue to be some of the most popular drawing tables around, and it's not hard to note why. As their own website attests, the Mayline company has been around since 1939, and they designed high quality furniture and work spaces for architects, engineers, and other similar professionals from the very beginning. Today Mayline is known for having many of the best drafting tables (also called drawing tables) around. The variety in different designs and full use of office furniture makes these highly desirable.This company started with the idea of being an engineering supply company, and it's a niche that has served them well. With five different company subsects, this corporation makes a lot more than Mayline drafting tables, but this is still the product that the company hangs their name on, and for good reason.Also Called Drawing TablesDrafting tables is the technical term for what these pieces of professional office furniture are, although another common term is drawing tables. If you hear "drawing table" or "drafting table," you're basically hearing about the same thing. Mayline drafting tables are among the most popular, and the use of these interchangable terms is understandable considering both reflect a professional function of the office furniture's use. So if the topic ever comes up, or the paragraph begins with one term then switches to another, don't be confused.A Mayline drafting table and a Mayline drawing table is the exact same thing.Mayline Drafting Tables History & UsesThe original drafting tables came during the Industrial Revolution, and were multi-purpose desks where large and complex drawings and plans could be spread out. In early use, they were often in a gentleman's study, allowing for a pursuit of aristocratic arts or interests. As the economy changed and technology changed, so did the use of these tables, which were often also called "mechanical desks" because of the way they functioned.Modern drafting tables and drawing boards are still most commonly used by engineers and architects. Most modern drating tables are made of metal and specialized so that modern technology and practices can be practiced with ease with these pieces of office furniture.One little interesting note: it was from these pieces of antique office furniture that the term "Well back to the drawing board," came from, usually referring to drastic changes to ideas that failed or were voted down and often also referred to an engineering or technical issue.Conclusion on Mayline Office TablesMayline Office Tables are among the most popular because the company has a long history that many experienced consumers trust. This isn't a run down on other competitors' products: there are plenty of good companies who produce very good drafting tables that any engineer or architect would be very happy with, but Mayline has constantly been mentioned as one of the best for good reason, and when you'have nearly 70 years of happy return customers to back you up, it's hard to argue.I hope you found this hub on Mayline drafting tables helpful, and if you're looking for a new drawing table, it doesn't get much better than what this company has to offer. Now if you want a good follow up, check out this place for some great ergonomic mesh office chairs.
Back to School Help!Read Details! Get 10Points For1 with Best Outfit!?
Back to School Help!Read Details! Get 10Points For1 with Best Outfit!?
go to and type in first ay of school and people make collages of what to wear and on the side it tell you wear you can buy it i love that website go check it out• Related QuestionsHow do you like my first chapter?It sounds just like Twilight only difference is the chick is the vamp. I bet next chapter will feature a boy who has an 'aura' that makes her want to suck his blood or something equally ridiculous.Your originality staggers me.------Is this an incredibly stupid idea?technicality you shouldn't get in trouble for that... but i have gotten in trouble for similar things when i was in school... they called it a distraction to other students (i was doing the goth thing before it was popular).------What to wear now in Miami?TRAVEL LIGHT AND ALWAYS BRING A CHANGE OF CLOTHES FOR A NIGHT ON THE TOWN!! tHE BEACH IS THE NECESSARY BIKINI REGARDLESS, AND THE NIGHT LIFE IS NOT MUCH MORE IF YOUR LOOKIN FOR A GREAT TIME...........iT IS MIAMI!!!!!------Should I wear a dress or a skirt on Valentine's Day?It depends upon the weather for me really. Within the fall I like to wear longer skirts and in the wintertime I wear longer ones with my boots, however in the spring and summer I prefer to wear short summer dresses------am looking for a wedding gown that i saw in a magazine years ago, fell in love with it. now cant find it help?Have you gone to a bridal shop yet? There may be some that have an archive of sorts of wedding gowns (photos, magazines, etc) that you may be able to find something close if not 'the one'.Good luck & Congrats------Can anyone read about these dreams for me please?Well, i think you like this guy. But you may be scared and unsure of what your friends think of it. try talking to your friends :)help me? thanks ------how do i look cute with my dress code?oh, that must be tough but one word ACCESSORIES! i now leave you to think...try: hope you find something you like :)------Ladies what is a good outfit for fall weather?girl jeans--ripped.((makes guys look so effin sexy))brown and red colors.((to make you blend in with the season))and some nice high heels that are so god damm gourgous it makes girls jeloushahahhope this helpssexy bioch------How is my intro for my story?i don't think you should say "all the more scary looking" in paragraph # 2. and in paragraph # 3 maybe u should say the doll looked most appauling afyter seeing the red yarn stiched over the mouth. Other than that AWESOME!------How would someone with this personality look/dress like?So if she is wealthy and artistic, probably like beige trousers with a navy blue jacket and white top. OR mayeb this outfit jpg.------This is the first half of chapter 1 in my book I'm writing. Can anyone read it and tell me how it is?omfg that is such a good story it makes me think of the twilight saga i love how you give so many details and describe his face i love the names and you need to keep on writing keep me updated------What shall i do about my daughter starting middle school???!?Woah, when I was that age I went to bed at 9:00 and read for an hour. I would say 8:30 - 10:00. Take her on a shopping spree at Justice. They have 40% off sales and cute clothes too. No more movies and chocolate------does anybody want to make me an outfit?Age: 15 Gender: woman form: in maximum circumstances Skater with incredibly Like, Prep colors: Any shade of green, Black, pink, Blue, pink clothing: T-Shirts, Hoodies, skinny denims shops: PacSun, Delias, heat concern count number, Abercrombie shoes: communicate, autos upload-ons: Necklaces, rings------Back to school clothes shopping list!!?I like girls in jeans. It makes them look more home town like and it doesn't look like they try too much but if you are looking to get this men attention, this might not be what you would like------beauty tips for young teen plz?were just the same but im tall not short lolthis is what goes on menavy blue, tan , dark greensskinny jeansflats or kitten heelst-shirts on long vestslongs coats that elongats your figuehope this helps------shorts and a band-aid, or should i cover it up.?Shorts Shorts Shorts.Oh god Please Do Not Wear A Long Sleeve ShirtUnder A Spaghetti Strap Dress.Just Wear Shorts and Everything Will Be Fine,I Mean If You Have Your Ankle Brace,Then Why Does A Band Aid Matter.------Can i wear a long sleeves dress to prom?Hello:Yeah go for it. but if you'd like to be in style try making one out of clean unused plastic garbage/trash/bin bags. That material is in style these days. I hope I helped, if not I'm sorry.------Can i just wear a t-shirt and pants for ice skating and not a long sleeve or with jacket?well it depends if your a good skater or not ....if its your first time ... wear jeans ... it don't hurt as much when you fall over ... and also wear a jacketthe temperature is normally 0-3 degrees in indoor rinks------Winter mommies...what type of outfit?i live in michigan. so it may be a little different. plus my son was born in march. but he went home in a university of michigan sleeper. we had a huge snow storm the day my son was born too------fashion/dress for teen girls in boston?Boston gets very cold in the fall/winter so make sure you pack a lot of warm clothes such as jackets, sweatshirts/pants, jeans, long sleeves, etc...In September, you could probably wear shorts if it's early in the month------Cute Ways To Dress For School?This Site Might Help You.RE:Cute Ways To Dress For School?I really like blue jeans and layering shirts , what are some things i can use as comfy assecories and some cute casual things to do with my hair THANKS------At a traditional Catholic wedding w/o communion at 7pm, do I have to wear a long dress??I like girls in jeans. It makes them look more home town like and it generally does not look like they try too hard but if you are looking to get this men attention, this might not be what you want------I think one of my students is being neglected/abused?well...don't you have an obligation to report anything out of the ordinary?? I would talk to the guidance counselor at your school and see what the next approach would be...they are better equipped for situations like yours. good luck------I'm fashionably challenged please help?well, 10 things that a teenage girl must have in her wardrobe are1) a little black dress2) a trench coat3) heels4) neutral coloured flats5) neutral coloured handbag6) a cardigan7) a blazer8) a day dress9) good pair of jeans10) an all occasions top------What is your school's dress code?bottoms, below fingertips3finger sleeveswe are allowed to wear any type of shoes, including flipflopspajamas are not a problem, (besides by style)those saggy type hats are acceptable, but not like sports capsheadbands everyone wears themhoodsno------Which of these dresses do you like the most?hey, i like the first one which is pink. It will really suit your age. If you changed the color to Black would also be nice. I have noticed that all of the dresses are short. Yet they are really pretty!------Anyone else have a daughter/s like this?Well u cant get her all dresses because school starts in the fall which means winter is right around the corner and you just said that she'll wear pants wen its cold so yes get her some pants as well :)------Why do females athletes wear tiny clothing and males dont?Sad to say but I think they want to make a fashion statement. Who knows maybe it's an endorsement for the clothing and so they get money for it. You are right others do just fine and even win some!.------Do women care how a man dresses or is that only shallow immature girls who do?Clothes do matter to me, because they tell you a lot about someone.I just know that I'm going to probably get along better with a guy who has really casual style and dresses for comfort and function rather than fashion.------What is the Disneyland dress code you must have to work there?I really like little skirts and the real way i fix it being brief is leggings and coloured tights. Not the methods with holes however the ones that virtually look like leggings but are obviously tights as a result of material------15 year old girl always comes to class with injuries?Yes, because if there is an abusive parent, someone needs to intervene. Same case if this student's injuries were self-inflicted, which would indicate depression.Unless she secretly fights criminals in her free time and picked up injuries from there.------what can i wear over or under this dress to be warm at a New York evening Wedding? Shoes - Or if you don't like them look at the rest of the shoes on the site.------What kind of hairstyle will look nice with this dress?Angel,it incredibly is a quite gown,yet as a guy,i think of somewhat like the type interior the image,it exhibits the gown and your self greater powerful,in case you spot my factor,so have an astounding time to------Why am I the only one to dress for the cold appropriately at school?I asked myself this same question when I moved to CT. In the winter it gets cold. However, I see many people in shorts and a zipped or pullover sweater. No lie, I even seen this one girl in flip flops.------Anyone with a sense of fashion... please help?I have a good look Somethign like that.------Wearing A Cherry Red Dress To A Wedding?I like females in jeans. It makes them look more city like and it generally does not look like they are trying too hard but if you're trying to get this guys attention, this may well not be what you would like------What would you call my style???? :)?It's really cute and laid back. I think it's more of a girly style with a slight edge.Also, if you want to add details, you can. It's under the edit link on your question or something.------I need a new wardrobe for fall I'm 23. I want advice on what basic essentials I should get to mix and makeGet classic clothes that don't go out of style, and accessorize. The accessories can change with time and you can wear the same clothes as a base. You keep up with fashion trends this way, and save money too.------Where can I find a sweater dress for a reasonable price?urban planet, urban outfitters, costa blanca....those are the only ones i can think of, and i dont know if you have one near you or not.also, a good suggestion, thrift stores! cheap, and you never know what youll find:)------Fall wardrobe for school aged children?my daughter wears uniforms, so i replace them as needed. i never went heavy into shopping as they had plenty of clothes from the summer to last a few months into the school year. i replaced clothes as need then, too------I'm 15 and going to a Georgia wedding in November. What should I wear?!?This is a pretty dress, it's short so not too dressy, but still elegant. Forever 21 has lots of cute dresses...and cheap! ------Why do people think that western riders are pur redneck hillbillies that don't care about their horse?Same reason people think english riders are stuck up snobs that wear their jods so tight so the sticks don't fall out of their butts. Ignorance and bigotry.There are amazing riders of both disciplines. And total jerks in both.------Survey: What is your style? (GIRLS)?1. jeggins and pumps and top and cardigan2. demin skirt and tank top (if its actually hot)3. jeans/jeggins or skirt with tights, uggs and hoodie4. jeggins and hoodie, pumps or uggs5. hollister, river island, primark..random ones6. pink7. down and straightened------What do you think? I'll answer yours if you answer mine. A little bit long, but please help. I'm confused!?It does sound like he likes you, but he may be shy about it or unsure of what to do. You may need to make the first move if you really want something to happen between the two of you------for grae 8 grad i have a dress its like not straps or tube tops its full length and full sleeves but all the?Psh no,it sounds like there trying to be too grown up and to slut-like.As long as your dress is pretty and is not covering your body from the top pf your head to the floor, u should be fine.------Have no idea what to wear on first day?!? would work well :) I suggest lose fitting but not baggy shirt with shorts or boyfriend jeans :P------what is this fall's fashion?cuffed high boots, skinny jeans, and stripped long sleeve sweaters. Thick belts around the waist with a long white shirt and black leggings, kimono styke dresses and peep toe shoes... Try looking at this months issues of Lucky fashion magazine and glamour.
Design Scheme of Multi-channel Voltage Measurement Based on Stm32
Design Scheme of Multi-channel Voltage Measurement Based on Stm32
This design proposes a design scheme of multi-channel voltage measurement based on STM32 chip, and the measurement range is between 0-10V. The built-in A / D of STM32 samples the multi-channel voltage values to obtain the corresponding digital quantity. Then the corresponding analog voltage value is obtained according to the proportional relationship between digital quantity and analog quantity, which is displayed by TFTLCD display equipment, and the multi-channel collected data is stored in SD card.1. IntroductionIn recent years, data acquisition and its application have attracted more and more attention, and data acquisition system has developed rapidly. It can be widely used in various fields.Data acquisition technology is one of the important branches of information science. Data acquisition is also a process of obtaining object information from one or more signals. Data acquisition is an important link in industrial control systems. It is usually realized by some single chip microcomputer systems with relatively independent functions. As an indispensable part of the measurement and control system, the performance characteristics of data acquisition directly affect the whole system.Voltage measurement is the most universal. It is of great significance to study and design methods and instruments to improve voltage measurement accuracy. In the design of voltage measurement, single chip microcomputer as controller is the core of the whole design. In addition, there must be an analog-to-digital converter (ADC) in the design. ADC is used to directly collect analog voltage and convert analog signal into digital signal. It directly affects the accuracy and speed of data acquisition.2. System overviewThe microcontroller of this design adopts STM32 single chip microcomputer.STM32 Series MCU is designed based on the Cortex-M3 core of arm company. Its clock frequency reaches 72mhz. It is a high-performance product among similar products. It has the advantages of high performance, low cost and low power consumption. It is a good choice in embedded application design. The A / D converter in the design adopts STM32 built-in ADC. STM32 ADC is a 12 bit successive approximation analog-to-digital converter.It has up to 18 channels and can measure 16 external and 2 internal signal sources. The A / D conversion of each channel can be performed in single, continuous, scanning or intermittent mode. The conversion results can be stored in the 16 bit data register in left or right alignment. The maximum input clock can reach 14mhzThis design can measure the voltage value of 8 channels, the measurement range is 0-10V, and the display error is ± 0.001V. LCD displays the voltage value and waveform in real time, and microSD card synchronously stores the data. The system principle block diagram is shown in Figure 1.Design scheme of multi-channel voltage measurement based on stm323.3 LCD control circuitThe LCD used in this design is 2.4 inches, 320 & times; 240 resolution. The LCD module is controlled by the FSMC interface of STM32.FSMC (flexible static memory controller) can be changed into static storage controller. It is a unique storage control mechanism of STM32 series high storage density microcontroller with internal integration of flash of more than 256Kb and suffixes Xc, XD and Xe. By setting the special function register, FSMC can send corresponding data / address / control signal types according to different external memory types to match the speed of the signal, so that STM32 series microcontrollers can not only apply various external static memories of different types and speeds, Moreover, it can expand a variety of different types of static memory without adding external devices, so as to meet the comprehensive requirements of system design for storage capacity, product volume and cost.In STM32, one end of FSMC is connected to core Cortex-M3 through internal high-speed bus AHB, and the other end is an external bus for extended memory. After the access signal of the kernel to the external memory is sent to the AHB bus, it is converted into a signal conforming to the communication protocol of the external memory through the FSMC and sent to the corresponding pin of the external memory to realize the data interaction between the kernel and the external memory. FSMC acts as a bridge, which can not only convert the signal type, but also adjust the signal width and timing, so as to shield the differences of different storage types and make them no difference to the kernel.FSMC can connect devices such as nor / PSRAM / NAND / PC card, and has FSMC_ A [25:0] has 26 address buses and FSMC [15:0] has 16 data buses. In addition, the extended storage space of FSMC is divided into 8 blocks. Select the block of the operation through the address line. In this way, the LCD will operate as a memory with one address space.3.4 SD card drive circuitThe SD card used in this design is microSD, also known as TF card. MicroSD card is a very small flash memory card, which is mainly used in mobile phones. However, due to its small volume and the continuous improvement of storage capacity, it has been used in GPS devices, portable music players, digital cameras and some flash memory disks. The pin diagram of microSD card is shown in Figure 9.MicroSD card, like SD card, has SPI and SDIO operation buses. Compared with SDIO bus, SPI bus has simple interface, but its speed is slow. We use SDIO mode.MicroSD card has 4 data lines in SDIO mode.In fact, microSD has 1-wire mode and 4-wire mode in SDIO mode, that is, 1 or 4 data lines are used respectively. Of course, the speed of 4-wire mode is faster than that of 1-wire mode, but the operation is more complex. The 4-wire mode of SDIO is used in this design. The hardware connection diagram of microSD card is shown in Figure 3.STM32 MCU Chinese official websiteSTMicroelectronics / St / STM
How Does Temperature Affect the Speed of Sound?
How Does Temperature Affect the Speed of Sound?
As other answers show, the speed of sound is slightly influenced by temperature.Much more interesting is the influence of gradients in temperature! The usual distribution of temperature at different heights is: high at ground level, decreasing upwards. This profile, with slightly higher sound velocity at ground level causes wave fronts to curve upwards. Sometimes the temperature profile is inverse, from ground level to a certain height, in the order of hundreds of meters. This inversion layer acts as a reflector, causing sound to propagate over much larger distances.It is not the speed as such, but the differences in speed that have important influence on sound propagation.1. How to increase my running speed?No, leaping prime does now not make you a quicker runner. Speed is muscular so you will do whole frame paintings along side plyometrics, which can be exceptional varieties of bounding and leaping to construct explosive force. To get greater at going for walks you ought to run. If you are employed on lifting and doing the plyometrics you are going to have the groundwork to upgrade your going for walks. What form of going for walks are you running for? If it's soccer then you definitely will have to coach for brief bursts of velocity. If it's one other game you have got to appear on the distances required on your game. A huge aspect of velocity it response. That manner the begin. Whether it's out of the blocks in a race, or attending to a fly ball within the outfield. Speed is vigor so that you ought to be ready to loosen up rise up tall, maintain your elbows at ninety levels, swing them directly entrance to again, and now not throughout your frame. Land at the balls of your ft.2. Water flows through a 1.5 cm diameter pipe into a 275 liter bathtub, which it fills in 5 minutes. What is the speed of the water in the pipe?Mass of 275 litres of Water divided by 5 minutes x 60 seconds = Time of 300 secondsMass Flow Rate of 0.9166 litres per secondThis is excessive amount of water in Speed or Velocity to fill a bathtub in 300 seconds. See IPHE & CIBSE CoP & Technical Guidance on maximum flow rate for 15 mm smooth wall copper pipework. The water pressure is another factor is consider.Water flows through a 1.5 cm diameter pipe into a 275 liter bathtub, which it fills in 5 minutes. What is the speed of the water in the pipe?.3. Not getting the download speed I should be getting?you download a file to what ? a phone or a computer? ethernet or wirelessly ? you need to be more clear on how to ask a question, even with my godlike powers i cant read your mind4. Need help gaining speed/trimming fat?challenging task. browse in google. that will may help!5. Why are people so insistent that speed of light is constant for all observers and is the maximum traveling speed?In special relativity, when the speed of light is constant for everyone, time can be different. When different travellers or observers have light remain constant, their time can change to allow for this. So try to wrap your head around the fact that different observers can have differences in time, and this allows the speed of light to remain constant for all observers.6. fur nice fan motor Polly have to be smaller to make the fan go faster?Motor pulley larger or driven pulley smaller will increase speed7. What are the technical factors in a processor that determine its speed?Clock Speed of the Processor and its primary cache size determines its speed in terms of throughput8. Is faster than the speed of light possible?well ist just a theory so it could be or couldnt be true.....einstien said if we could go the speed of light then we cold time travel...other people say it is still expanding....what i want to know is how can all of that crap fit into somthing the size of a pin head lol.9. How to train for faster picking speed on guitar?Assuming we are talking about alternate picking, there are basically two exercise methods for building speed.The first and the better known one is to start slow. Set your metronome to a comfortable tempo and play the exercise a few times. Then go up 2 bpms or so and repeat. Continue alternating between plus two and minus one. Back down some 10 bpm when you hit your limit and work your way up from there again. You can go up 10 bpm or so from time to time just to see how it feels. The second one is to practice in bursts. Start with two notes and play as fast as you can. Then add the third and continue from there. This method is not as well known as the first one but is every bit as useful. You can also start from the most difficult spot on the exercise and add notes on both sides.Practicing scales only is probably not the best way to go. There are specially crafted exercise sets to build speed that isolate common patterns. Troy Stetina's book Speed Mechanics contains one such set.In terms of technique, on your left hand, only apply enough pressure to avoid buzz. You will get tired very quickly if you exert more force than necessary. The lighter your left hand touch is, the easier it is to play fast. It's easier said than done but that's the whole idea of practicing.On your right hand, I would not worry that much about wrist vs. elbow unless you are aiming for Guiness speed record. Wrist movement is probably a bit better but there's nothing wrong with a combination of wrist and elbow. Guitarists argue about it all the time but there are superb guitarists in both camps which proves that both techniques are equally viable. Just avoid finger movement, it does not work for fast playing
What Is WiFi? Just Tell Me What It Is, and What It's Used For.?
What Is WiFi? Just Tell Me What It Is, and What It's Used For.?
Wi-Fi= wireless fidelity and what everyone else said1. i want to acess internet on my psp and my pc.i heard about this wifi link.i don't what a wifi is.plz help?you are not going to get free internet. if you want internet you have to pay for it. all Wi-Fi is, is you plugging a router into your internet connection, then the router transmits a signal.2. What WiFi router should I buy for my 800 SF apartment?Any wifi router provided by the internet provider will do and serve the purpose...An apartment area of 800 sq. ft is small enough which can easily be served by the company provided hardwares!You would not want to have a very strong signal that anyone outside your apartment can tap into!3. What is wifi and how do I know if my house has it?Wi-Fi is a wireless internet connection that things like laptops, wireless cards, and game systems use connect to the internet. If you do not have a wireless router, you do not have Wi-Fi4. What Wifi usb Adpter Is Better?Neither, they are both low quality. Buy from a reputable brand5. what is wifi actually? how does it works?it's a wireless connection. you can connect any computing device as long as you have a wireless nic enabled on that certain device. to access the internet you need to be in a "hotspot" that's the place where you can get your signal to connect to the internet6. How can I find out what Wifi networks my iPhone knows about?I think the only way is to actually be in range of the network that you want to get rid of. You can not actually see what networks you have stored, not that I know of, but if you want to get rid of a network.Settings > Wifi > Then select the blue arrow on the right of the network that you are connected to and click "Forget this Network".7. How do I find out what wifi chipset my phone has?I simply used the dmesg command in a terminal emulator and scrolled until I found anything named bcm432x... and wlan. Think thats it. I have lg p5008. I'm not entirely sure what WiFi is?Have a look at the wikipedia article. Usually you would get a DSL connection and set up your wireless network at home. The wireless network connection is also called W-LAN or WiFi, but in this context, WiFi has nothing to do with the ISP. Not sure if in your region any provider sells internet acces via WiFi, this is not a common thing to do.9. What is wifi and what does it do for a phone?If you have internet at home and have a wireless router you can connect wirelessly to it and get on the internet etc. on your phone. Hope this helps!10. 802.11 standards compliant methods of forming a LAN. Unlike Ethernet, data does not travel along a cable, but rather, wirelessly, at a frequency of 2.4GHz (802.11b/g) or 5.0GHz (802.11n and the antiquated 802.11a)11. What is "WiFi" and can you explain ,more about it? I'm GOnna buy a laptop.?well if you want wifi in your home you have to have an internet connection threw a modem..ex comcast, qwest, at&t. you will need to purchase a wireless router, its just another device that hooks into your modem. so no it is not free, but it is a one time charge because your ISP will not charge you to have the wireless router hooked up...and where you can use it is in your home. you can also connect to wifi at places like starbucks, and that is free as well.12. What WiFi router brands or models are considered to be secure? [closed]For cheap solution I use a wifi router well supported by dd-wrt alternative firmware. Here you can find supported models database.For more advanced, trouble-safe solution I use Ubiquiti UniFi - the AC-Lite model is really good.13. What is a bluetooth? what is WIFI? And what is a BLU RAY DVD?Bluetooth is a wireless technology for connecting electronic devices to each other. For instance there are Bluetooth Headphones, Bluetooth Cell Phone Ear Pieces, etc... If you want to be able to use the Bluetooth Ear Pieces with your cellphone, your cellphone must be Bluetooth compatible. WiFi is a method of connecting to the internet wirelessly. For instance many big cities may have "WiFi Hotspots". If you are in these WiFi Hotspots and you have your laptop or any other device that can connect to the internet wirelessly, you can surf the web wirelessly as long as you are in that particular area. And Blu-Ray is Sony's High Definition format disc. The difference between Blu-Ray and Regular DVD is that Blu-Ray can produce 1080p HD quality picture and Blu-Ray can hold more data. A Single Layer Blu-Ray disc can hold 25GB and a Dual Layer DVD can hold 50GB. A standard DVD can only hold around 8.5GB total. Basically if you have a HDTV, Blu-Ray would be the best choice for getting the best picture quality with clear, crisp viewing quality.
Which Is Better, WiFi Or ZigBee Wireless Technology
Which Is Better, WiFi Or ZigBee Wireless Technology
Wireless replacing wired has become an irreversible trend, which can also be said to be a new industry. At present, there are two technical camps of ZigBee and WiFi in the field of smart home, and WiFi and ZigBee have their own advantages in wireless technology. Among the most popular wireless technologies in the industry, WiFi technology and ZigBee technology are the most worthy of competition. So which is more advantageous, WiFi or ZigBee? Who will become the mainstream in the future? This is worth discussing.WiFi: WiFi technology is the fastest transmission technology at present. The product cost is low and it is more popular in current life. However, the devices that can be connected with WiFi are limited. The actual scale of adding WiFi network to devices generally will not exceed 16. In the development of, the number of switches, lighting and home appliances will certainly be far more than 16, so WiFi has its advantages, but it has great limitations, Limited development.ZigBee is a two-way wireless communication technology with low complexity, high security and short-range transmission. It has the characteristics of strong scalability and can be embedded in various household devices. ZigBee also has advantages in security.1. The future smart home network will be a smart network, which can sensitively perceive the changes of data and traffic of each node; Be able to intelligently allocate, repair and deal with network resources; It has the attribute of "self-learning and self-organization".. However, in the practical application of families, switches, lighting, curtains, anti-theft devices, etc. will not move after installation.2. ZigBee supports up to 65000 nodes, but can WiFi connect more than 100 devices? The answer is No. So large capacity is good.For example, LVMI smart home, that is, Xiaomi's smart home brand, basically supports ZigBee protocol.When it comes to LVMI, I recommend their smart gateway. The smart home market is very messy. Sometimes we are excited to buy it and find that it does not support it. Therefore, when we buy it, we should see what the device supports or does not support. Of course, the best thing is to buy a gateway with high compatibility. LVMI's gateway product not only supports ZigBee protocol, but also is compatible with homekit. This product supports 32 aqara devices of green rice, which can be connected with Apple's "home" app. After that, it can control the associated devices on IOS devices and Siri directly. I think most young people now use fruit machines to compare prices. In this way, it is still very friendly to most IOS users. For fruit powder users, the biggest advantage of this product is price. At present, the smart home products supporting homekit on Apple's official website are very expensive. Even a simple smart socket costs 295 yuan. Through the aqara gateway of LVMI, the cost of access equipment can be reduced.Well, comprehensive comparison, WiFi is relatively more convenient, but ZigBee will be more stable and support more devices. If you only want to use one or two smart devices, WiFi can be used. If you want to create a complete set of smart home ecological chain, it is obvious that ZigBee is more in line with your requirements. Xiaobian is more optimistic about ZigBee. After all, home is developing towards the trend of comprehensive intelligence, Technology with multiple devices can ensure this. No matter what kind of technology, we hope to constantly update and improve, and making our products convenient is the king.
Smart Home Promotes Building Intercom into Thousands of Households, with Large Stock and Incremental
Smart Home Promotes Building Intercom into Thousands of Households, with Large Stock and Incremental
In the large densely populated cities of Beijing, Shanghai, Guangzhou and Shenzhen and the rising second and third tier cities, the housing demand is increasing year by year. The huge floating population not only promotes the rapid development of low-end real estate resources in the first tier cities, but also extends the complex industrial chain around the buildings. In particular, the development slogan of "smart city" put forward by the state in recent two years gives hope to the market that lives on security products around buildings in addition to real estate developers.Smart home promotes building intercom into thousands of householdsAt present, more and more building intercom manufacturers begin to go deep into the field of smart home and combine building intercom system with smart home system. This is reflected in the construction of "digital building" and "smart home industry ecosystem":Combined with the smart home system, in addition to the traditional intercom unlocking function, the building intercom also integrates many convenient functions such as SMS notification, mobile app remote control, security alarm, indoor monitoring and viewing, elevator call, home control, information home and so on.Building intercom and smart home complement each other, further improving the value-added space and cost performance of both, thus bringing huge space for function expansion.In the future, it is expected to take advantage of the upsurge of smart home to develop rapidly in the wave of home intelligence, and will carry more home control functions.Smart community derived demand brings new business opportunities for building intercomIn addition to the smart home, the building intercom system, as the entrance of the smart community, realizes the extension of multiple functions such as identity confirmation, access control, security monitoring, human-computer interaction and so on by combining AI technology.The consumer demand derived from the smart community can be said to bring new business opportunities to the building intercom industry. In the process of continuous promotion of the smart community, many building intercom enterprises see the future business opportunities and begin to make corresponding layout and planning on products and solutions. Using information means, Internet and Internet of things technology, develop community oriented Internet of things system and information platform, and provide real-time, fast, efficient and low-cost Internet of things, interconnection and intelligence for the community on this basis. For example, it launched smart community management, smart life services, smart travel and other related solutions, and continued to pay attention to the field of community and personal security.High, middle and low-end take all stock and incremental market space is largeAs an upstream industry of real estate, building intercom has significantly increased the demand for medium and low-end building intercom products under the condition that the state vigorously promotes the construction of affordable housing and indemnificatory housing.With the implementation of smart city construction, the demand for high-end building intercom products is also increasing day by day. The application of high-definition visualization and face recognition in the field of building intercom is accelerating.At the same time, after more than 20 years of development, many communities equipped with building intercom in the early stage are facing problems such as disrepair and backward configuration. Therefore, the equipment renewal demand of old communities has also become a new round of market growth point of building intercom system.Overall, China's housing market will continue to develop. According to the relevant development strategies of the State Council, China will build 10 billion square meters of housing by 2020. For building intercom enterprises, there is a large development space for building intercom related products in both stock market and incremental market.Conclusion: in a word, opening up the integration and docking with comprehensive life service platforms and community operation platforms such as third-party payment, smart city, video surveillance, community o2o e-commerce, smart home and community elderly care, that is to provide overall solutions for communities and families, which has become the future development trend of deepening reform, transformation and upgrading of building intercom enterprises. Moreover, with the gradual improvement of community infrastructure, building intercom enterprises also need to change from the role of product provider to the role of supporting service provider.
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