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- special520 2015-08-23 00:00:00
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- 王鑫啊0088 2015-08-23 00:00:00
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- 請高手們解紅字:四面八方
2015-08-22 09:15:27
428
2
- 兩道解答題，請幫我好嗎?
- 一.人類從古至今，發(fā)明放大鏡和顯微鏡的歷史中，出現(xiàn)了哪些的科學(xué)家和重大的科學(xué)時間? 二.從古至今放大鏡和顯微鏡對人類作出了哪些貢獻(xiàn)? (只要列舉幾位和幾件事就可以了) 幫我啊``下午5點前幫我搞定可以不?
2007-03-13 13:31:00
301
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- 請各位高手相助－英語翻譯
- openingceremonyplenarylecturefiltrationfiltrationintheframeworkofglobalisationandtechnicalinnovationSolid-Liqiud-SeparationbyCakeFiltration-StateoftheArtandFutureExpectat... opening ceremony plenary lecture filtration filtration in the framework of globalisation and technical innovation Solid-Liqiud-Separation by Cake Filtration-State of the Art and Future Expectations. Gas Separation with supported ionic liqiud membranes Alternative permeate recovery systems for pervaporation A. Seeberger，C.Kern，A，Jess，University of Bayreuth，Germany concentration and dewatering of ethanol by organophilic and hydrophilic zeolite membranes safe drinking water for everybody?Membrane technology from small scale and viceversa Two years experience with Germanys largest two stage ultrafiltration plant for drinking water production. Potable water production by membrane processes Effect of bacterial deformation on microorganisms’ removal functionalized and doped nanofiber filtration media with lonex and antimicrobial properties the development of an enhanced surface filtration medium based on short metal fibres for applications in food & beverage，chemical & pharmaceutical industry Commercial applications for DisruptorTM alumina nanofiber filter media Assessment of the cleanable dust filtration behaviour of surface treated needle felts by characterisation parameter determined by image analysis 展開
2008-10-13 09:32:23
856
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- 烘箱溫度控制高手請幫忙！?。?！
- 有聽說過一種通過控制加熱功率的百分比輸出來控制烘箱溫度的方法！請問是使用壽命儀表或者元件來實現(xiàn)的?。。?！求高手幫忙！或者有沒有其他方法通過控制加熱功率來實現(xiàn)烘箱的溫控！！... 有聽說過一種通過控制加熱功率的百分比輸出來控制烘箱溫度的方法！請問是使用壽命儀表或者元件來實現(xiàn)的?。。。∏蟾呤謳兔?！ 或者有沒有其他方法通過控制加熱功率來實現(xiàn)烘箱的溫控?。。。。。≌埜嬖V幫忙！ 展開
2016-02-15 21:10:22
426
1
- 請高手介紹一些筆記本電腦
- 想買筆記本電腦，3000元左右！游戲功能強(qiáng)大一點，玩大部分游戲不卡的！可以無線上網(wǎng)的，不知道是買組裝機(jī)還是原裝機(jī)，這樣的電腦大概是什么配置，Z好給些賣電腦網(wǎng)站我！小弟感激不盡！
2009-05-29 05:10:15
410
3
- 請問玩孤島危機(jī)2的高手們
- 怎么升級納米裝備，我是新手，認(rèn)不得怎么升級，還有納米裝備咋解鎖?。?
2012-01-24 01:39:58
460
3
- 有關(guān)負(fù)離子發(fā)生器的一個問題，請高手們解答?。ǔ晒獯鹪僮芳?0懸賞）
- 請問高手們 為什么我在做負(fù)離子發(fā)生器時，變壓器從6KV升級到8KV，負(fù)離子的釋出量是增大不少，但卻會產(chǎn)生一種高頻，而這種高頻的聲音讓人好難受，希望有人能盡快解答，感激不盡?。?！
2008-04-28 15:43:05
776
5
- 請大師們幫忙測測命運
- 性別：男出生：公歷2003年9月16日、農(nóng)歷2003年8月20日，凌晨00：40分請問取名有講究嗎... 性別：男 出生：公歷2003年9月16日、農(nóng)歷2003年8月20日，凌晨00：40分 請問取名有講究嗎 展開
2008-05-20 20:23:05
455
2
- 硬度十度，請老師們評測？謝謝！
2015-10-09 06:13:50
519
3
- 請高手回答：什么是行程編碼？ 請解釋！
2017-12-15 17:34:17
703
1
- 大腸桿菌檢測的問題，請高手幫忙
- 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肉湯陽性管數(shù)查MPN表得到的，那么后面的復(fù)發(fā)酵試驗和生化試驗是不是可以不用做的啊? 后面是不是就是為了驗證以上檢測的準(zhǔn)確性的呢？ 請高手賜教，不勝感激涕零
2010-05-10 10:10:32
609
1
- 請高手幫我翻譯一下這一段。。。
- Carbonnanomaterialsarenovelmanufacturedmaterials，havingwidespreadpotentialapplications.Adsorptionofhydrophobicorganiccompounds(HOCs)bycarbonnanomaterialsmayenhancetheirto... Carbon nanomaterials are novel manufactured materials， having widespread potential applications. Adsorption of hydrophobic organic compounds (HOCs) by carbon nanomaterials may enhance their toxicity and affect the fate， transformation， and transport of HOCs in the environment. In this research， adsorption of naphthalene， phenanthrene， and pyrene onto six carbon nanomaterials， including fullerenes， single-walled carbon nanotubes ， and multiwalled carbon nanotubes was investigated， which is the first systematic study on polycyclic aromatic hydrocarbons (PAHs) sorption by various carbon nanomaterials. All adsorption isotherms were nonlinear and were fitted well by the Polanyi-Manes model (PMM). Through both isotherm modeling and constructing “characteristic curve”， Polanyi theory was useful to describe the adsorption process of PAHs by the carbon nanomaterials. The three fitted parameters (Q0， a， and b) of PMM depended on both PAH properties and the nature of carbon nanomaterials. For different PAHs， adsorption seems to relate with their molecular size， i.e.， the larger the molecular size， the lower the adsorbed volume capacity (Q0)， but higher a and b values. For different carbon nanomaterials， adsorption seems to relate with their surface area， micropore volume， and the volume ratios of mesopore to micropore. Quantitative relationships between these sorbent properties and the estimated parameters of PMM were obtained. These relationships may represent a first fundamental step toward establishing empirical equations for quantitative prediction of PAH adsorption by carbon nanomaterials and possibly other forms of carbonaceous (geo-) sorbents， and for evaluating their environmental impact. In addition， high adsorption capacity of PAHs by carbon nanotubes may add to their high environmental risks once released to the environment， and result in potential alteration of PAHs fate and bioavailability in the environment. 展開
2010-01-13 13:35:43
372
1
- 高手請教你 怎么調(diào)試壓力控制器
2012-11-23 03:33:32
394
2
- 請懂GPS的高手進(jìn)來
- 1.試述偽距測量和載波測量的原理。 2.什么是GPS定位和GPS相對定位？ 3.在偽距測量中，為什么在同一觀測點接收機(jī)必須至少同時接收到四顆衛(wèi)星的信號才能解出接收機(jī)所處的位置和三維坐標(biāo)？ 4.試述單點與動態(tài)定位和偽距差分動態(tài)定位的原理。 5.試述GPS測量... 1.試述偽距測量和載波測量的原理。 2.什么是GPS定位和GPS相對定位？ 3.在偽距測量中，為什么在同一觀測點接收機(jī)必須至少同時接收到四顆衛(wèi)星的信號才能解出接收機(jī)所處的位置和三維坐標(biāo)？ 4.試述單點與動態(tài)定位和偽距差分動態(tài)定位的原理。 5.試述GPS測量的誤差來源以及如何采取措施或減弱這些誤差對測量結(jié)果的影響。 另外請給我一些GPS相關(guān)的文章、論文之類的。謝謝 展開
2006-04-07 15:46:29
524
2
- 請高手鑒定我的玉器
2013-07-21 20:15:28
435
2
- 請高手幫忙翻譯一下 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
2018-11-22 17:49:22
330
0
- 分貝疊加問題，請高手幫忙
- 有一種設(shè)備的噪音為3米處55分貝，如果五臺這種設(shè)備放在一起，那所產(chǎn)生的噪音是多大？求公式及原理？請詳細(xì)解答，會增加懸賞的，拜托了，高手們... 有一種設(shè)備的噪音為3米處55分貝，如果五臺這種設(shè)備放在一起，那所產(chǎn)生的噪音是多大？求公式及原理？請詳細(xì)解答，會增加懸賞的，拜托了，高手們 展開
2013-08-31 01:54:22
1088
2
- 請高手高手高高手幫忙翻譯下面的設(shè)備名稱
- 請幫忙翻譯下：謝謝！斑點酶解系統(tǒng)自動斑點切取系統(tǒng)蛋白純化系統(tǒng)基因芯片掃描系統(tǒng)二維電泳梯度膠制備系統(tǒng)全自動電泳儀多通道懸液芯片系統(tǒng)體內(nèi)可見光成像系統(tǒng)如果您翻譯的十分準(zhǔn)確，我... 請幫忙翻譯下：謝謝！ 斑點酶解系統(tǒng) 自動斑點切取系統(tǒng) 蛋白純化系統(tǒng) 基因芯片掃描系統(tǒng) 二維電泳梯度膠制備系統(tǒng) 全自動電泳儀 多通道懸液芯片系統(tǒng) 體內(nèi)可見光成像系統(tǒng) 如果您翻譯的十分準(zhǔn)確，我將再加Z高分（好像是100分）。 我要英文，謝謝！ 展開
2009-07-21 06:02:17
773
6
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