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，原來的4/4拍，怎麽忽然變成了3/4拍？為什麽沒有一拍的休止符（紅箭頭處）？紅箭頭前的一拍要拉成一拍然後休息一拍，還是拉成兩拍？謝謝！[
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我和我的中學同學。我們是男校，沒有沾花惹草的緋聞，隻有還像昨天一樣的記憶。
我把照片的日期刪掉了。
我是前排左1。應該是班裏生日最晚的，一百米跑得最慢的。
中間左2的同學在文革中去外地串聯“支左",大概是在四川”犧牲“了。那是文革中有一天，忽然間在大街上看到大幅標語“為xxx烈士報仇”才得知的。功課很好的一個同學，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】。
理查德瓦格納
（5/22/1813-2/13/1883）
貝多芬的音樂支配著19世紀上半期，瓦格納的音樂則籠罩著它的後半期。瓦格納的歌劇改編了音樂的進程。以超人自居的瓦格納，以自己的歌劇和實踐給世界創造了一個作為藝術家的英雄，而且到達了前所未有的程度。
[
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Sonicboomisanimpulsivenoisesimilartothunder.Itiscausedbyanobjectmovingatthespeedofsound--about343meterspersecondor767milesperhouratsealevelandat68degreesFahrenheit.
Whentwoobjectsreachthesamefrequency,aphenomenoninphysicscalledresonanceoccurs.
Resonanceisaphenomenonthatoccurswhenanobjectorsystemissubjectedtoanexternalforceorvibrationthatmatchesitsnaturalfrequency.Whenthishappens,theobjec...[
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