1.Arduinoprojects:
WithArduinoUNO:
Materials:
ArduinoUnoV3,5pieces
DisplayRGBLEDboardsorstripes:
A&C(onthepictureabove):RGBLED5050,1meterstrip(60RGBLEDs),2pieces
B:Fibonacci256v3.1boardfromevilgeniuslabs.com,1piece
D:RGBLED5050,WS2812Bringpanel(1ring,15RGBLEDs).1piece(DisnotanArduinoproject,itisthesecondproject,checkproject2belowplease)
E:RGBLED5050,WS2812B8x32m...[
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小提琴曲，原来的4/4拍，怎么忽然变成了3/4拍？为什么没有一拍的休止符（红箭头处）？红箭头前的一拍要拉成一拍然后休息一拍，还是拉成两拍？谢谢！[
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我和我的中学同学。我们是男校，没有沾花惹草的绯闻，只有还像昨天一样的记忆。
我把照片的日期删掉了。
我是前排左1。应该是班里生日最晚的，一百米跑得最慢的。
中间左2的同学在文革中去外地串联“支左",大概是在四川”牺牲“了。那是文革中有一天，忽然间在大街上看到大幅标语“为xxx烈士报仇”才得知的。功课很好的一个同学，太可惜了[
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Ifabatteryisonashelfandyoudonothingwithit,itsvoltagewilldropgradually,whichiscalledshelflifeofthatparticularbattery.Ihaverecordeddailyvoltagedropofdifferentrechargeablebatteriesformorethan10years.Ionlyputthefirsttwotothreeyear'sdataonthegraph,sincethesoftwarei'musingwillnothandlethatamountofdata.Thebatterieswhichvoltageswererecordeddailyare:1.Rayovacrechargeable,AAA,NiMH.1.2V2.EnergizerAAA...[
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1.Lithiumionshelflife.Method:Justrecordthebatteryvoltageeachdayfor3years,usingamultimeter.Result:Lithium-ionbattery(9V)shelflifein3years:2.Lithium-ionchargingcharacteristics.Method:Charginglithium-ionbatterywithaconstantvoltageandaconstantcurrent,recordthevoltageandcurentinevery5minutes.Battery:NikonEN-EL3abattery(7.4V,1500mAh):WhydoIchoose8.4Vand0.6A?BecausethechargerfromNikonMH-18specified8.4Van...[
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Lithium-ionbatteriesisalmosteverywherenowadays,inyourphone,inyourlaptop.Accordingtothelinkbelow,
https://www.google.com/search?q=the+life+of+lithium+ion+battery&rlz=1C1IHCB_enUS722US729&oq=the+life+of+lithium+ion+battery&gs_lcrp=EgZjaHJvbWUyBggAEEUYOTIKCAEQABgPGBYYHjIICAIQABgWGB4yCggDEAAYDxgWGB4yCAgEEAAYFhgeMggIBRAAGBYYHjINCAYQABiGAxiABBiKBTINCAcQABiGAxiABBiKBTINCAgQABiGAxiABBiKBTIN...[
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Thegardenisinzone6.
From:https://www.brecks.com/zone_finder
Tomato,cucumber,pepper:
A.Seedinginroom:
OnMarch18,putseedsoftomato,pepper,cucumbersindirt.
Soil:
Inpapercups,fillthebottomhalfofthepapercupwithgardensoil,thenfillthemiddle1/4cupwithaseedingstarter(mixtureofsoilandfertilizer)andfillthetop1/4cupwithgardensoilagain.
Mixthetoptwosoilsandburytheseedsinaround0.5-1c...[
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Forclose-upphotography,someequipmentsareneededA.Macro(NikoncallsMicro)lenses:1.CanonMP-E65mmf/2.8,1-5x2.Canon60mmf/2.81x,internalfocus3.Tamron90mmf/2.8forNikon,1x4.Quantaray60mmf/2.8forNikon,1x5.Tamron60mmf/2.0forNikon1xinternalfocusAmacrolensisaspeciallens,youcouldtakearegularpictureaswellasaclose-uppicturewithit.Lifesizedobject'simagecanbetakenintoyourpicture.Mostmacrolenscanget1xsizeofyouro...[
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OneWXCfriendaskedmetowritesomethingaboutWagner,thisiswhatIreadandtranslated.Thisarticlebasicallyisasummarybytranslationfromabookchapter【1】。
理查德瓦格纳
（5/22/1813-2/13/1883）
贝多芬的音乐支配着19世纪上半期，瓦格纳的音乐则笼罩着它的后半期。瓦格纳的歌剧改编了音乐的进程。以超人自居的瓦格纳，以自己的歌剧和实践给世界创造了一个作为艺术家的英雄，而且到达了前所未有的程度。
[
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Sonicboomisanimpulsivenoisesimilartothunder.Itiscausedbyanobjectmovingatthespeedofsound--about343meterspersecondor767milesperhouratsealevelandat68degreesFahrenheit.
Whentwoobjectsreachthesamefrequency,aphenomenoninphysicscalledresonanceoccurs.
Resonanceisaphenomenonthatoccurswhenanobjectorsystemissubjectedtoanexternalforceorvibrationthatmatchesitsnaturalfrequency.Whenthishappens,theobjec...[
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