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- 奈何橋_002 2012-12-18 00:00:00
- 環(huán)球科學(xué)報(bào)道 蟑螂因?yàn)樗鼈冾B固而聲名狼藉，人們常常無(wú)奈地感嘆：就算經(jīng)歷了核戰(zhàn)，蟑螂也有可能生存下來(lái)。研究證明，這些人的感慨也不無(wú)道理。蟑螂沒(méi)有頭，也依然可以存活一個(gè)星期。在美國(guó)馬薩諸塞州的阿默斯特大學(xué)里，研究蟑螂進(jìn)化的生理學(xué)者和生物化學(xué)家約瑟夫.孔克解釋說(shuō)，明白了為什么蟑螂以及其他一些昆蟲(chóng)，沒(méi)有頭也能生存，就能明白為什么人類不行。如果人類被砍掉頭顱，馬上就會(huì)流血，血壓降低，妨礙了氧和養(yǎng)料的傳輸，無(wú)法供應(yīng)給維持生命所需的組織?？卓藢?xiě)道：“你會(huì)死于流血過(guò)多?！?趙交中ezgupke2o
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熱門問(wèn)答
- 請(qǐng)教高手幫忙:反射式光纖位移傳感器應(yīng)電路設(shè)計(jì)圖？
2012-12-17 08:04:49
412
1
- 下面哪個(gè)不是反射式光纖位移傳感器的特點(diǎn)
2016-04-09 01:25:52
393
1
- 光纖位移傳感器
- 對(duì)于測(cè)量戶外儀表箱體位置傾斜，移動(dòng)用哪種光纖傳感的方式測(cè)量比較適合~在線等！... 對(duì)于測(cè)量戶外儀表箱體位置傾斜，移動(dòng)用哪種光纖傳感的方式測(cè)量比較適合~在線等！ 展開(kāi)
2014-03-03 02:16:19
421
3
- 請(qǐng)電子制作高手幫忙設(shè)計(jì)一個(gè)信號(hào)發(fā)生器電路？
- 1、要求：（1）信號(hào)發(fā)生器能產(chǎn)生正弦波、方波和三角波種周期性波形。（2）輸出信號(hào)頻率在100Hz~1MHz內(nèi)可調(diào)。（3）在1K負(fù)載下，輸出正弦波信號(hào)的電壓峰-峰在0~5V可調(diào)。（4）輸出信號(hào)波... 1、要求： （1）信號(hào)發(fā)生器能產(chǎn)生正弦波、方波和三角波 種周期性波形。 （2）輸出信號(hào)頻率在100Hz~1MHz內(nèi)可調(diào)。 （3）在1K負(fù)載下，輸出正弦波信號(hào)的電壓峰-峰在0~5V可調(diào)。 （4）輸出信號(hào)波形無(wú)明顯失真。 （5）自制穩(wěn)壓電源。 2、發(fā)揮部分（可選）： （1）可實(shí)時(shí)顯示輸出信號(hào)的類型、幅度、頻率。 展開(kāi)
2009-04-25 02:08:35
434
2
- 電路分析，求電路中電源的功率，求高手幫忙解答，謝謝?。?！
2014-09-22 01:05:31
446
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- 電路分析，求電路中電源的功率，求高手幫忙解答，給好評(píng)，謝謝?。?！
2014-09-22 11:10:07
554
2
- 高手幫忙翻譯??！+100
- 虛擬儀器是一種新的測(cè)試與測(cè)控技術(shù)，近年來(lái)得到了迅速發(fā)展，基于虛擬儀器的機(jī)器視覺(jué)系統(tǒng)就是其領(lǐng)域的一個(gè)重要分支。本文圍繞基于虛擬儀器的機(jī)器視覺(jué)有關(guān)理論和其在玻璃瓶口缺陷檢測(cè)中... 虛擬儀器是一種新的測(cè)試與測(cè)控技術(shù)，近年來(lái)得到了迅速發(fā)展，基于虛擬儀器的機(jī)器視覺(jué)系統(tǒng)就是其領(lǐng)域的一個(gè)重要分支。本文圍繞基于虛擬儀器的機(jī)器視覺(jué)有關(guān)理論和其在玻璃瓶口缺陷檢測(cè)中的具體應(yīng)用進(jìn)行了研究。 針對(duì)玻璃瓶這一對(duì)象檢測(cè)的高精度、高準(zhǔn)確度、實(shí)時(shí)性的特點(diǎn)，本文提出了一種基于LabVIEW的數(shù)字圖像處理檢測(cè)方案，并在設(shè)計(jì)過(guò)程中解決了一系列關(guān)鍵問(wèn)題：利用硬件和軟件的編程實(shí)現(xiàn)了對(duì)玻璃瓶口的缺陷監(jiān)測(cè)；使用閾值進(jìn)行圖像的二值化處理，并進(jìn)行開(kāi)啟、閉合以增強(qiáng)圖像質(zhì)量；使用Vision Builder AI對(duì)有故障的圖像進(jìn)行故障特征識(shí)別； 通過(guò)理論研究與實(shí)驗(yàn)，證明了本文所提出的玻璃瓶口缺陷監(jiān)測(cè)方法是有效和可行的，為其機(jī)器視覺(jué)檢測(cè)的進(jìn)一步研究和開(kāi)發(fā)奠定了很好的基礎(chǔ) 請(qǐng)用專業(yè)術(shù)語(yǔ)，不要用在線翻譯。謝謝····好可以多加分 展開(kāi)
2008-06-10 11:03:29
488
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- 英語(yǔ)高手幫忙翻譯一下
- ThequalitysystemofthecompanyisinconformitywithISO9002.Makingcomprehensiveuseofbiotechnology，thecompanyspecializesinmanufacturingandsellingC-4seriesorganicacidsandchiralpr... The quality system of the company is in conformity with ISO 9002 . Making comprehensive use ofbiotechnology， the company specializes in manufacturing and selling C-4series organic acids and chiral products. These products are widely used in many fields such as food， phamaceutical and chemical industries， and are well accepted by the overseas markets. The man products are L-Malic acid ， DL-Malic acid， L(+)-Tartaric acid ， Fumaric acid， Maleic acid and other organic acids. Annual productivity amounts to 20，000 tones. The company has become an important manufacturer of C-4 series organic acids in the world . All the products of the company have respectively met the different international aadvanced standards such as Food chemicals Codex， U.S. Pharmacopoeia ，British Pharmacopoeia and the products have obtained Star-K Kosher certificate. Above 70% of the Companys products are exported to Japan， Europe， Australias， the United states and middle East ， and they are renown and well recognized in the international markets. The company will devote itself to research and development of enzyme technology and organic electrochemistry. It will continuously introduce new food additives， chiral pharmaceutical intermediates， chiral auxiliaries and chiral drugs. Depending on superior quality， good service and high reputation， the company is willing to establish a long-term mutually beneficial business partnership with overseas customers and continue contribute to the happy life of humans. 展開(kāi)
2009-09-17 10:19:02
583
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- 邏輯難題 高手幫忙 急。。。。。
- 有3頂白帽子和2定黑帽子。讓甲、乙、丙3人同向列成一隊(duì)，然后分別給他們各戴上一頂白帽子。丙可以看見(jiàn)甲乙，乙可以看到甲，甲則看不到乙丙。他們3人中，誰(shuí)可以正確推導(dǎo)出自己頭上所戴... 有3頂白帽子和2定黑帽子。讓甲、乙、丙3人同向列成一隊(duì)，然后分別給他們各戴上一頂白帽子。丙可以看見(jiàn)甲乙，乙可以看到甲，甲則看不到乙丙。他們3人中，誰(shuí)可以正確推導(dǎo)出自己頭上所戴的帽子的顏色？ 答案是甲，我想知道為什么？？？ 展開(kāi)
2010-07-24 03:42:23
361
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- 50分！高手幫忙翻譯一下
- LabVIEWisapowerfulandcomplexprogrammingenvironment.LabVIEWisshortforLaboratoryVirtualInstrumentEngineeringWorkbench.Itisapowerfulandflexibleinstrumentationandanalysissoft... LabVIEW is a powerful and complex programming environment. LabVIEW is short for Laboratory Virtual Instrument Engineering Workbench. It is a powerful and flexible instrumentation and analysis software development application created by the folks at National Instruments—a company that creates hardware and software products that leverage computer technology to help engineers and scientists take measurements， control processes， and analyze and storem data. National Instruments was founded over twenty-five years ago in Austin， Texas by James Truchard (known as Dr. T)， Jeffrey Kodosky， and William Nowlin. At the time， all three men were working on sonar applications for the U.S. Navy at the Applied Research Laboratories at The University of Texas at Austin. Searching for a way to connect test equipment to DEC PDP-11 computers， Dr. T decided to develop an interface bus. He recruited Jeff and Bill to join him in his endeavor， and together they successfully developed LabVIEW and the notion of a “virtual instrument.” In the process they managed to infuse their new company—National Instruments—with an entrepreneurial spirit that still pervades the company today. Engineers and scientists in research， development， production， test， and service industries as diverse as automotive， semiconductor， aerospace， electronics， chemical， telecommunications， and pharmaceutical have used and continue touse LabVIEW to support their work. LabVIEW is a major player in the area of testing and measurements， industrial automation， and data analysis. For example， scientists at NASA’s Jet Propulsion Laboratory used LabVIEW to analyze and display Mars Pathfinder Sojourner rover engineering data， including the position and temperature of the rover， how much power remained in the rover’s battery， and generally to monitor Sojourner’s overall health. LabVIEW provides an extensive library of virtual instruments and functions to help you in your programming. It includes conventional program debugging tools with which you can set breakpoints， single-step through the program， and animate the execution so you can observe the flow of data. 畢業(yè)設(shè)計(jì)急用，望高手幫忙翻譯一下 展開(kāi)
2007-06-12 15:44:11
687
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- 烘箱溫度控制高手請(qǐng)幫忙?。。?！
- 有聽(tīng)說(shuō)過(guò)一種通過(guò)控制加熱功率的百分比輸出來(lái)控制烘箱溫度的方法！請(qǐng)問(wèn)是使用壽命儀表或者元件來(lái)實(shí)現(xiàn)的！?。?！求高手幫忙！或者有沒(méi)有其他方法通過(guò)控制加熱功率來(lái)實(shí)現(xiàn)烘箱的溫控?。?.. 有聽(tīng)說(shuō)過(guò)一種通過(guò)控制加熱功率的百分比輸出來(lái)控制烘箱溫度的方法！請(qǐng)問(wèn)是使用壽命儀表或者元件來(lái)實(shí)現(xiàn)的！?。。∏蟾呤謳兔?！ 或者有沒(méi)有其他方法通過(guò)控制加熱功率來(lái)實(shí)現(xiàn)烘箱的溫控?。。。。?！請(qǐng)告訴幫忙！ 展開(kāi)
2016-02-15 21:10:22
426
1
- 超聲波清洗機(jī)的超聲波發(fā)生器的電路設(shè)計(jì)圖哪有？
- 超聲波清洗機(jī)的超聲波發(fā)生器的電路設(shè)計(jì)圖
2010-05-02 20:14:20
409
1
- 光纖位移傳感器大致線性范圍？
2014-12-30 20:20:43
409
1
- 請(qǐng)教高手這段話怎么翻譯
- Therefore， combining the results from the SEM， EDS， and XRD pattern， the phase composition of GWZM852 alloy could be inferred to include an a-Mg matrix and large block-shaped Mg12Zn(Y，Gd) phases distributed in a discontinuous network wi... Therefore， combining the results from the SEM， EDS， and XRD pattern， the phase composition of GWZM852 alloy could be inferred to include an a-Mg matrix and large block-shaped Mg12Zn(Y，Gd) phases distributed in a discontinuous network with some small block- and rod-shaped eutectic phases scattered at the edge of the Mg12Zn(Y， Gd) phases. 展開(kāi)
2013-03-13 08:33:03
425
4
- 如何使用標(biāo)定好的反射式光纖傳感探頭
2016-12-04 00:23:52
645
1
- 請(qǐng)教，超級(jí)電容的應(yīng)用電路
2017-04-15 01:49:29
340
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- 大腸桿菌檢測(cè)的問(wèn)題，請(qǐng)高手幫忙
- 如題，在大腸桿菌GB/T 4789.38 2008中，Z終的大腸桿菌數(shù)是根據(jù)LST肉湯陽(yáng)性管數(shù)查MPN表得到的，那么后面的復(fù)發(fā)酵試驗(yàn)和生化試驗(yàn)是不是可以不用做的啊? 后面是不是就是為了驗(yàn)證以上檢測(cè)的準(zhǔn)確性的呢？ 請(qǐng)高手賜教，不勝感激涕零
2010-05-10 10:10:32
609
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- 請(qǐng)高手幫忙翻譯一下 3
- 2.2.1. Physical and physicochemical characterization The particle size distribution of the Ch-zeolite was determined using a laser diffraction equipment (CILASk 1064) and standard wet sieving (Mesh Tylerk series). Scanning electron mic... 2.2.1. Physical and physicochemical characterization The particle size distribution of the Ch-zeolite was determined using a laser diffraction equipment (CILASk 1064) and standard wet sieving (Mesh Tylerk series). Scanning electron microscopy (SEM-PHILIPSk XL20) was used for photomicrographs as well as to analyse the Ch-zeolite composition (Energy Dispersion X-ray， EDX). The sample was initially placed in a vacuum chamber for coating with a thin layer (few nanometers) of gold (Au). The specific surface area of the material was measured by the methylene blue technique and by nitrogen gas adsorption methods， with the latter also providing information about particle porosity. In the methylene blue adsorption method， aqueous solutions (50 ml) of methylene blue (100 mg l 1) were agitated using an orbital shaker (Marconik) for an hour at room temperature in the presence of different quantities of the Ch-zeolite (0.05–0.3 g). The suspensions were then allowed to settle for 23 h and the resulting supernatants were centrifuged at 5000 rpm before the analysis of the residual methylene blue concentration. Results obtained correspond to averaged values of three different experiments. The specific surface area was evaluated by the Langmuir model， assuming the formation， at high concentrations， of a dye monolayer and 1.08 nm2 molecule 1， for the cross-sectional area (Van den Hul and Lyklema， 1968). The Ch-zeolite specific surface area was evaluated by the nitrogen gas adsorption method， using automated equipment (Autosorb 1-Quantachrome Instrumentsk)， employing multipoint BET isotherm adsorption data fitting. Also from these data， the porosity of the material was evaluated through parameters such as volume of total pores (d < 206 nm)， surface area and volume of micropores (d < 2 nm; Micropore Analysis Method). Zeta potential measurements for the natural and ammonia loaded zeolite， as a function of medium pH， were determined using a Zeta Plusk equipment (Brookhaven Instruments). Suspensions (0.01% v/v) of the Ch-zeolite， previously sieved below 37 Am (400 Mesh Tylerk)， in a 10 3 mol l 1 solution of KNO3 were used and the medium pH was controlled with the addition of HNO3 (pH< 7) and KOH (pH>7)， separately. For the Ch-zeolite saturated with ammonia， suspensions of the material were prepared by the same procedure， except that the sample was loaded with 100 mg NH3–N l 1 of ammonia. 展開(kāi)
2018-11-22 17:49:22
330
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