示波器 SWPVAR 翻譯

Fly19975 2012-01-28 18:49:12 724 瀏覽

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天人三問 2017-06-20 00:00:00

示波器 SWPVAR Oscilloscope SWPVAR

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370026575susu 2012-01-29 00:00:00

描微調(diào) 掃描微調(diào)（SWP VAR）此旋鈕開關(guān)在校正位置時(shí)，掃描因數(shù)從掃描時(shí)間選擇開關(guān)讀出。當(dāng)開關(guān)不在校正位置時(shí)，可連續(xù)微調(diào)掃描因數(shù)。

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FyfyY5H1h1 2017-06-20 00:00:00

您問的這個(gè)示波器中的SWPVAR不用翻譯，我來告訴您它的含義吧。這個(gè)SWPVAR實(shí)際上是模擬示波器校正時(shí)要用到的“周期的調(diào)節(jié)按鈕”通常它在示波器周期單位設(shè)定大按鈕的左邊，標(biāo)記是SWP VAP。下面給你介紹下有關(guān)校正的操作細(xì)節(jié)。示波器周期數(shù)調(diào)節(jié) 　　通常需要校正的主要是電壓峰峰值和周期數(shù)的調(diào)節(jié)，這也是對波形的測試內(nèi)容。這些調(diào)節(jié)由按鈕VOLTS/DIV、TIME/DIV、SWP.VAR，VOLTS/DIV共同配合完成，各按鈕上的標(biāo)志指向哪一個(gè)數(shù)值，表示這一數(shù)值就是顯示屏的坐標(biāo)軸上每一格的單位數(shù)值。橫坐標(biāo)表示周期，縱坐標(biāo)表示電壓幅值，例如：VOLTS/DIV白色指定點(diǎn)撥在1V，即表示縱坐標(biāo)的每一小格的電壓幅值為2V；在TIME/DIV上將指定點(diǎn)指向1mSV，即表示橫坐標(biāo)的每一小格的周期為1mS。再根據(jù)波形所占的單位格數(shù)，就可以直接讀出（或者經(jīng)驗(yàn)算后讀出）波形的幅度和周期，進(jìn)而用來判斷是非曲直、分析故障原因了。　　在正式進(jìn)行校正之前，根據(jù)示波器左下角校正的參考數(shù)值，應(yīng)把電壓擋撥到單位1V、把周期擋位撥到1mS的位置上（當(dāng)然，你也可以選擇其它為單位值），同時(shí)還要確認(rèn)使用哪一個(gè)CHANNEL（哪一蹤）或者兩個(gè)CHANNEL一起使用（到底使用哪個(gè)，就看你把MODE的選擇功能撥到哪個(gè)位置上了）：CH1（diyi蹤）、CH2（第二蹤）、DUAL（兩蹤同時(shí)使用）、ADD（雙蹤疊加）。按POWER開始調(diào)整，把輸入耦合方式撥到GDN（輸入到地），這是用來對波形的ZX位置校正的，配合此功能鍵的還有POSTION（波形上下調(diào)節(jié)按鈕）。由于我們所測量的波形常常是脈沖信號波形，所以當(dāng)ZX位置調(diào)整完畢后，在一般情況下都會把擋位撥到AC（交流輸入），而DC檔位（直流輸入）在平時(shí)較為少用。輸入方式　　將輸入方式設(shè)到AC后，將信號傳輸線的探頭接到校正的測試口，即可在顯示屏上看到方波。但這時(shí)的方波不一定是標(biāo)準(zhǔn)的（正確的），有可能電壓的峰峰值不足，周期不對，這個(gè)時(shí)候就是考驗(yàn)?zāi)銓@示波器各功能的熟悉程度了。在電壓按鈕的軸ZX有一個(gè)按鈕，是用來對電壓值的補(bǔ)償?shù)?，在正常情況下將它右旋到卡位鎖定，就可以正常使用了。如果出現(xiàn)鎖定后仍不能回復(fù)校正參數(shù)值的情況，就要利用這個(gè)電壓幅值補(bǔ)償電位器來補(bǔ)償了。而周期的調(diào)節(jié)按鈕則沒有那么隱蔽，它在周期單位設(shè)定大按鈕的左邊，標(biāo)記是SWP VAP，它可以對波形周期的調(diào)整。同時(shí)，在SWP VAPR的左邊還有一個(gè)POSMCN按鈕，其作用是將波形水平平移(右下圖)，它是協(xié)調(diào)WSP VAP使用的，讓我們能更準(zhǔn)確方便地觀察或調(diào)節(jié)波形的周期，這些都可以將示波器的原始波形設(shè)置成符合校正參考數(shù)值。如果遇到了這種情況：探頭接到校正測試口時(shí)波形不能靜止下來。則有可能是因?yàn)檫@個(gè)位于周期大按鈕右邊的LEVEL還沒有調(diào)試好。LEVEL的名稱叫“尋跡電平”，而它的實(shí)際作用是用來水平同步補(bǔ)充控制，當(dāng)兩蹤同時(shí)使用時(shí)往往會出現(xiàn)水平不能同步，這個(gè)時(shí)候就要考慮到LEVEL頂頭上的TRIC. ALT按鍵了，這是強(qiáng)制性鎖定。如果你熟悉使用這些鍵，把示波器的原始波形校正并不是困難的事。注意事項(xiàng) 　　校正波形不能不特別注意的一個(gè)地方就是：信號傳輸線的信號衰減擋位(見圖15)。當(dāng)其撥到*1時(shí)，表示無衰減（平時(shí)設(shè)置點(diǎn)）；撥在*10時(shí)，表示衰減10倍，通常在輸入信號的頻率過低時(shí)，它相應(yīng)的周期會變得很大，這時(shí)就要先進(jìn)行衰減再作測試了，不過還是要在測試出的結(jié)果中提升10倍才行，這樣才是原來的波形值。還有一個(gè)就是位于SWP VAP和POSMCN中間的擴(kuò)大按鍵（*10盤 MAC）當(dāng)周期單位數(shù)設(shè)置在Z低的微秒值都還不能看清波形時(shí)，或是說當(dāng)波形的頻率很高時(shí)，就要運(yùn)用到這個(gè)擴(kuò)大按鍵了。也就是說，所謂的擴(kuò)大和衰減只是對周期而言，而對電壓幅度則不起作用，而且不論是擴(kuò)大還是衰減，調(diào)整波形完畢后都要相應(yīng)地將周期的倍數(shù)縮小或放大。為了使波形的讀數(shù)更加精確、清晰，在原始校正波形時(shí)一定要把波形調(diào)得Z準(zhǔn)、Z清晰、線條調(diào)至Z精細(xì)，只有這樣讀數(shù)才會Z為準(zhǔn)確誤差才會減至Z少，對故障分析有舉足輕重的作用。 Z后還有一點(diǎn)需要注意：校正波形調(diào)整完畢后，所有補(bǔ)償按鈕都不能調(diào)動(dòng)或更改（即SWP VAP和電壓補(bǔ)償），否則要再次對示波器重新校正一次

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示波器 SWPVAR 翻譯:

急??！labview 英文幫助的翻譯只要信號發(fā)生器和示波器: 跪求哪位大俠給個(gè)labviewHTL幫助的翻譯，只要信號發(fā)生器和示波器的部分！！在線等！有的直接發(fā)到我郵箱，小弟不勝感激！lennon868@tom.com不弄這個(gè)HTML的了，只要是說LABVIEW信號發(fā)生... 跪求哪位大俠給個(gè)labview HTL幫助的翻譯，只要信號發(fā)生器和示波器的部分！！在線等！有的直接發(fā)到我郵箱，小弟不勝感激！ lennon868@tom.com 不弄這個(gè)HTML的了，只要是說LABVIEW信號發(fā)生器方面的文獻(xiàn)就行，中文5000字左右沒人能給嗎。。。無奈啦，呼喚哪位大俠來拯救下有的直接發(fā)我郵箱，立馬加分展開

翻譯翻譯，請高手幫我翻譯一下這個(gè)說明: Followthesysteminstallationinstructionscarefullyandinthespecifiedorder.ThesoftwaremustbeinstalledonthecomputerbeforeconnectingtheUSBcable.2.1FacilitiesRequirementsFacilit... Follow the system installation instructions carefully and in the specified order. The software must be installed on the computer before connecting the USB cable. 2.1 Facilities Requirements Facilities requirements for the alpha-SE system are listed in Table 2-1 and the system dimensions are given in Fig. 2-1. As shown in Fig. 2-2， the alpha-SE tool requires a clear work area of 20 by 18 inches (500 by 460 mm)， excluding the operator computer. 2.2 Unpacking the Hardware Opening the Shipping Container Move the alpha-SE shipping container to the area where the tool will be installed. Open the container and remove the top and side pieces of packing foam. Carefully remove all smaller components from the shipping container， verifying that you received all components， as shown in Fig. 2-3. Finally， remove the alpha-SE ellipsometer and position it on your clear 20” by 18” (510 by 460 mm) workspace. Caution: The alpha-SE ellipsometer without sample chuck weighs approximately 37 lbs. (16 kg.). Please find an assistant to lift the alpha-SE unit out of the shipping carton and on to clear work surface. 展開

生物化學(xué)翻譯: To show that HAX-1 degradation is part of the apoptotic process and any involvement Omi may have， we used the ucf-101 inhibitor. ucf-101 is a specific inhibitor of the proteolytic activity of Omi and has been described previously (13). When... To show that HAX-1 degradation is part of the apoptotic process and any involvement Omi may have， we used the ucf-101 inhibitor. ucf-101 is a specific inhibitor of the proteolytic activity of Omi and has been described previously (13). When HK-2 cells were treated with cisplatin in the presence of ucf-101， the percentage of apoptotic cells decreased and the inhibitor significantly blocked HAX-1 degradation. This effect was more pronounced when a higher concentration of the inhibitor was used. To confirm the specificity of the inhibitor in this system and exclude the possibility that another protease rather than Omi is involved in HAX-1 cleavage， we used cell lines derived from mnd2 mice (9). The parent cell line (mnd2-MSCV) derived from mouse embryo fibroblasts has no detectable Omi proteolytic activity (9). The same cell line has been transfected with wild type human Omi cDNA (mnd2-MSCV-Omi) and expresses high levels of active Omi protein (14). We found that in mnd2-MSCV cells， when induced to undergo apoptosis with various stimuli， the number of apoptotic cells was very low. Furthermore， no detectable cleavage of HAX-1 was observed. This is in contrast with the mnd2-MSCV-Omi cells where apoptosis was robust， and HAX-1 levels were inversely proportional to the degree of apoptosis. This experiment clearly shows that Omi is solely responsible for HAX-1 cleavage， which is essential for apoptosis under the conditions used in these experiments. HAX-1 subcellular localization depends on cell type (21， 30) and has been reported to be present in the mitochondria， cytoplasm， or plasma membrane (10， 21， 22， 30). We performed subcellular fractionation to investigate where HAX-1 cleavage by Omi takes place. We found that， in HEK293 cells， HAX-1 was predominantly present in the mitochondria， and this localization did not change in response to apoptotic stimuli. This suggests that Omi can initiate apoptosis in the mitochondria by cleaving HAX-1 protein. This is in accord with a recent study that shows Omi can induce apoptosis in human neutrophils treated with TNF- without being released from the mitochondria (7). Although several studies clearly define HAX-1 as an anti-apoptotic protein， the mechanism of its function is unknown. HAX-1 has sequence similarity to Bcl-2 family of proteins (10， 22). 展開

求翻譯。。。。。。。。。。。: During the preparation of the nano-products， these nano-units， such as nanoparticles， nanoclusters， nanowires and nanorods， can also self-assemble into the novel structural aggregates by several routes， including electron irradiation deposi... During the preparation of the nano-products， these nano-units， such as nanoparticles， nanoclusters， nanowires and nanorods， can also self-assemble into the novel structural aggregates by several routes， including electron irradiation deposition [19]， chemical vapor deposition [20]， laser vaporization-condensation [21]， charge transferring [22]， an organic reagent-assisted method [23]， solution-liquid-solid method [24] and catalytic vapor-liquid-solid growth [25]. With these routes， various nanoscale or microscale aggregates can demonstrate novel architectures， including tree-like， web-like， spherical， nanowire-like， network and fishbone-like aggregates. As a well-known method for producing the nanocapsules， however， arc-discharge has been rarely used to synthesize the aggregates self-assembled by the nanocapsules prepared simultaneously in arc-discharge. Nevertheless， it is possible that the arc-discharge can be developed into a new way to synthesize the aggregates. In the present work， we utilized arc-discharge technique with modified strategies， involving changing the hydrogen pressure， introducing gadolinium - aluminum alloy ingot as the anode and adjusting the elements percent of the anode according to their evaporation pressure， to synthesize a new type of nanocapsules， with intermetallic compound GdAl2 as core and amorphous Al2O3 as shell， which enlarge the family of the magnetic nanocapsules. At the same time， the regularly aligned three-dimensional macro-aggregates self-assembled by the nanocapsules without any template and catalyst were simultaneously synthesized in arc-discharge process. 展開

機(jī)械翻譯!!: 13.本系列儀器采用電流、電壓雙組取樣并經(jīng)單片處理后顯示，其讀數(shù)直觀、準(zhǔn)確。由于儀器采用了負(fù)載四線制取樣，從面消除了負(fù)載導(dǎo)線電阻對電顯示的影響。電路的電壓限幅，使得實(shí)驗(yàn)更加安全，可靠。 16.采用古埃法（gu-ai method）研究分子結(jié)構(gòu)，測量順磁和逆... 13.本系列儀器采用電流、電壓雙組取樣并經(jīng)單片處理后顯示，其讀數(shù)直觀、準(zhǔn)確。由于儀器采用了負(fù)載四線制取樣，從面消除了負(fù)載導(dǎo)線電阻對電顯示的影響。電路的電壓限幅，使得實(shí)驗(yàn)更加安全，可靠。 16.采用古埃法（gu-ai method）研究分子結(jié)構(gòu)，測量順磁和逆磁磁化率。主要結(jié)構(gòu)有：電磁鐵和恒流電源、數(shù)字式高斯計(jì)（霍爾效應(yīng)）、安培計(jì)和伏特計(jì)、配有照明系統(tǒng)的控制盤。系統(tǒng)采用了PID電子調(diào)節(jié)，全數(shù)字電源（0~10A無級調(diào)節(jié)），無需水冷卻，使得儀器動(dòng)礦層運(yùn)行更加穩(wěn)定可靠，防止因操作不當(dāng)而造成儀器損壞。 34. 本儀器由光學(xué)系統(tǒng)和信號處理系統(tǒng)兩部分組成，它根據(jù)光拍頻原理設(shè)計(jì)，通過光電轉(zhuǎn)換檢測，在普通示波器上同時(shí)觀察和比較兩束光的波形和相位，測量光程差和位相差，求得光速。采用新的分頻、觸發(fā)措施，能在示波器上觀察到精確、清晰的波形。 35.本裝置用霍爾效應(yīng)的原理測量螺線管軸向磁場強(qiáng)度分布。能判斷半導(dǎo)體載流子的符號，移開螺線管，可做共軛線圈實(shí)驗(yàn)。此裝置由測定儀和專用電源兩部分組成，實(shí)驗(yàn)儀上裝有螺線管、霍爾元件、二維移動(dòng)標(biāo)尺及IM，IH，VH轉(zhuǎn)換開關(guān)。專用電源提供霍爾元件工作電流IH，螺線管勵(lì)磁電流IM以及對霍爾電壓VH的測量。電流和電壓的測量均采用3 1/2位數(shù)顯表，測量精度高。翻出來后我再給分!一定會追加分!Z少50分!! 展開

幫忙翻譯: AttachingtheSampleChuckYouwillneeda#2Phillipsscrewdriverforthisstep.FollowingthedetailsshowninFig.2-4，installthesamplechuckbyfirstaligningthepinsonthebottomofthesamplechu... Attaching the Sample Chuck You will need a #2 Phillips screwdriver for this step. Following the details shown in Fig. 2-4， install the sample chuck by first aligning the pins on the bottom of the sample chuck with the receptacles on the alpha- SE base. Then tighten the upper two captive thumb screws. Next， use the Phillips screwdriver to tighten the lower two captive screws. Don’t over tighten the screws! It will make it difficult to remove them in the future; just ensure that the screws are snug. Finally， connect the vacuum line from the sample chuck to the vacuum fitting on the alpha-SE base. Releasing the Z-stage Shipping Lock To access the Z-stage shipping lock， first loosen the captive screw on the lamp/shipping lock access door， then open the access door by rotating 180°， as shown in Fig. 2-5. To release the Z-stage shipping lock， stand in front of the ellipsometer and use your left hand to balance the weight of the Z-stage (you will feel it lift up slightly). It will be difficult to release the shipping lock if you apply too much or not enough upward force. Next， use your right hand to move the shipping lock to the operating position (to the right， see Fig. 2-6). If the lock is hard to move， you can use a tool to gain more leverage. The shipping lock will move about 1/3” [8mm] to the right. Checking the Lamp Check that the QTH lamp in fully seated in the lamp housing. The lamp is located behind the actuator screw (see Fig. 2-6) and has two white wires protruding from the back of the lamp. Simply push down on the lamp ensuring that the lamp is fully seated in the lamp housing. Rotate the lamp/shipping lock access door to the closed position and hand tighten the captive screw. 拒絕翻譯軟件，翻譯軟件我自己也會用不是用翻譯軟件我就看不懂，只是，上來找人翻譯就是希望翻譯出比較容易看懂，不需要自己對照就可以看的說明書，如果用翻譯軟件，根本就詞不達(dá)意，還是要自己對著原文件核實(shí) 既然用了那么多積分，就希望有相當(dāng)?shù)某晒?，如果用翻譯軟件混積分，那就是人品問題了還有，某些人不要不懂亂說混積分展開

求助翻譯: 問題一：請問“在GF254硅膠板上，取樣點(diǎn)板，在254nm紫外光下觀察結(jié)果”這句話該如何翻譯？ZD是不知道“取樣點(diǎn)板”怎么翻譯問題二：麻煩高手幫忙翻譯一下2Results2.1柱色譜分離結(jié)果The... 問題一：請問 “在GF254硅膠板上，取樣點(diǎn)板，在254 nm紫外光下觀察結(jié)果” 這句話該如何翻譯？ ZD是不知道“取樣點(diǎn)板”怎么翻譯問題二：麻煩高手幫忙翻譯一下 2 Results 2. 1 柱色譜分離結(jié)果 The results of separation by column chromatography 柱色譜分離過程中，氯仿∶甲醇95∶5和90∶10洗脫出來的流分經(jīng)過反復(fù)的硅膠柱色譜分離純化得到組分C3。 2. 2 薄層色譜檢測結(jié)果 The results of Thin-layer chromatography. 組分C3在GF254硅膠板上展開后，可在254nm紫外燈下直觀觀測為單點(diǎn)，見圖1。 2. 3 GX液相色譜分析和制備單體化合物對組分C3 進(jìn)行GX液相制備，色譜圖顯示有4個(gè)色譜峰(見圖2) ，分離效果較好，收集4個(gè)單峰組分，得到4個(gè)化合物1～4，對以上4個(gè)化合物進(jìn)行GX液相分析，均為單峰，見圖3～4。 3 化合物的結(jié)構(gòu)鑒定通過制備液相收集得到4個(gè)化合物，對其中3個(gè)化合物進(jìn)行結(jié)構(gòu)鑒定: 化合物1，淡黃色晶體， UV λmax nm (logε) : 248 nm。E IMS，m / z 501. 3 [M + 1 ] + ，分子量為500。化合物1氫譜顯示7個(gè)甲基信號;δ1. 02， 0. 93， 0. 78 ( each 3H， s) ， 0. 89 ( 3H， d， J =6. 4Hz) ， 1. 23， 1. 25 ( each 3H， d， J = 5. 2Hz) ， 1. 22(3H， s) ，一個(gè)連氧碳上的氫信號δ3. 23 (1H， dd， J= 10 Hz) ，符合三萜化合物的結(jié)構(gòu)，可以證明化合物1為三萜類化合物。化合物2， UV λmax nm ( logε) : 250 nm。E IMS，m / z 515. 3 [M + 1 ] + ，分子量為514。化合物2的氫譜顯示7個(gè)甲基信號δ0. 77， 0. 94， 1.01， 1. 22， 1. 23 (3H， s) ， 0. 82 (3H， d， 10. 2 Hz) ，一個(gè)連氧碳上的氫信號δ3. 22 ( 1H， dd， J = 10. 5Hz) ，一個(gè)甲氧基上的氫信號δ3. 66 (3H， s) ，符合三萜化合物的結(jié)構(gòu)，可以證明化合物2為三萜化合物。化合物3， UV λmax nm ( logε) : 254 nm。EIMS，m / z 531. 2 [M + 1 ] + ，分子量為514?；衔? 的氫譜(見附錄)顯示7 個(gè)甲基信號δ0.78， 0. 82， 0. 87， 1. 03， 1. 24， 1. 31 ( 3H， s) ， 1. 17(3H， d， 6. 6 Hz) ，一個(gè)乙?；系臍湫盘?. 10(3H， s) ，一個(gè)甲氧基團(tuán)的氫信號3. 68 (3H， s) ，符合三萜化合物的結(jié)構(gòu)，可以證明化合物3為三萜化合物。化合物4結(jié)構(gòu)較復(fù)雜，不能確定是三萜化合物。二樓的辛苦了，非常感謝你的回答。不過好像沒有明白我的意思，而且有g(shù)oogle之嫌。展開

高分求高手翻譯，不要機(jī)械翻譯: Bimetallic dendrimer-encapsulated nanoparticles(DENs)are important materials，because they have demonstrated improvement in performance compared to the monometallic DENs in many systems when they are used as catalysts.This tutorial review fo... Bimetallic dendrimer-encapsulated nanoparticles(DENs)are important materials，because they have demonstrated improvement in performance compared to the monometallic DENs in many systems when they are used as catalysts.This tutorial review focuses on the recent research advances in bimetallic DENs with respect to their synthesis，characterization，and applications as catalysts.Bimetallic DENs can be made mainly via three routes:co-complexation，sequential loading，and partial displacement.The research in bimetallic DENs has been significantly promoted by the advancement of characterization instruments.The performances of bimetallic DENs as homogeneous and heterogeneous catalysts in organic synthesis have been compared with both monometallic DENs and their physical mixtures.It is concluded that the synergistic electronic effect in bimetallic nanoparticles enhances their catalytic activities. 能翻譯多少都可以的展開

軟件翻譯和人工翻譯哪個(gè)好:

白度翻譯能不能拍照翻譯古文？:

chinct怎么翻譯: chinct怎么翻譯

Stf翻譯啥意思:

THE SPORTING ROBOT 翻譯: My name is Hua Fei and I am a sporting robot of the 23rd century. I am an expert at high flying exercises. I jump from spaceships and as I fall I turn， dive， circle and dance until I softly land as close as I can to the finishing line. Robo... My name is Hua Fei and I am a sporting robot of the 23rd century. I am an expert at high flying exercises. I jump from spaceships and as I fall I turn， dive， circle and dance until I softly land as close as I can to the finishing line. Robot competitions in the23rd century are truly a popular sport. Fans from all over China watch their handheld TVs when a competition comes on. Last time I took part in the 78th Olympics on a flying island above Brussels in the sky. I won the silver medal for my performance. This year I had the honour to be chosen again. I wanted to meet robots from other countries and explore ideas about our sport. However， my programmer fell ill the week before we were going to leave. It was very painful for her and I felt very frightened. I no longer felt so confident that I would win. The day of the competition was rather cold for my legs and my special oil began to freeze. I paused before I jumped from the starting place on a little spaceship but then I began my performance. At the correct moment I tried to open my parachute but there was a problem. It only opened a little. Instead of flying softly to earth I began to fall faster and faster so that I could not turn， dive， circle or dance. My heart stopped beating as I landed heavily on a mountain covered with snow. This is why I am writing to you from my hospital bed with two broken legs and a fragile head. I did not win anything at the Olympics after all. I need the factory to build me two new legs and an even bigger head. Then I will be able to compete once more. Let's hope for greater success in the next Olympics! 全文翻譯請不要發(fā)機(jī)翻的很蛋疼展開

reducer如何翻譯？: 機(jī)械零配件中reducer如何翻譯？

拉力試驗(yàn)機(jī)怎么翻譯:

求化學(xué)翻譯: Graphite powder (<20m)， hydrazine， ammonia， N，Ndimethylformamide (DMF)， dopamine， 0.01M phosphate buffered saline (PBS; 0.138M NaCl， 0.0027M KCl， pH 7.4)， and ascorbic acid were purchased form Aldrich and used as received. Doubly disti... Graphite powder (<20m)， hydrazine， ammonia， N，Ndimethylformamide (DMF)， dopamine， 0.01M phosphate buffered saline (PBS; 0.138M NaCl， 0.0027M KCl， pH 7.4)， and ascorbic acid were purchased form Aldrich and used as received. Doubly distilled water was used throughout the whole experiments. The data of cyclic voltammetry (CV)， differential pulse voltammetry (DPV)， and electrochemical impedance spectra were obtained with a CHI 660 electrochemical workstation (CH instruments， Austin， TX). The electrochemical cell consisted of GCE (3mm diameter， Bioanalytical Systems， Inc.) as working electrode， Ag/AgCl (Bioanalytical Systems， Inc.) as reference electrode， and platinum wire as counter electrode. The impedance data were fitted to an appropriate equivalent circuit using ZsimpWin 3.0 software (Echem Software). The Raman spectra of graphene were obtained by micro-Raman system equipped with a homemade sample stage， a monochromator (SPEX 500 M)， and a CCD camera (Roger Scientific model 7346-001) with 514.5nm wavelength laser line. Graphene was characterized by field emission scanning electron microscope (SUPRA 55VP， Carl Zeiss) and atomic force microscope (NanostationII， Surface Imaging Systems). 展開

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