英語翻譯
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UNIPHOS-400 multiparameter UV/IR based Fire Detector detects fire by detecting simultaneously three important characteristics of fire viz. UV radiation in the solar blind region of 185-260 nm， IR emission from the hot CO2 which invariab... UNIPHOS-400 multiparameter UV/IR based Fire Detector detects fire by detecting simultaneously three important characteristics of fire viz. UV radiation in the solar blind region of 185-260 nm， IR emission from the hot CO2 which invariably is present in and around a fire and the continuum black body IR radiation from the fire. This microprocessor based detector is housed in a flameproof enclosure with a viewing window. It is mounted on a wall mountable stand with provision to adjust the field of view to bring the viewing window in line of sight of the likely spot where fire can occur. The detector gives a fire alarm (red led glows) when all the three chosen fire parameters are detected. Simultaneously a relay output is available. When any one of IR or UV radiation is detected yellow led glows to give a warn alarm and also a relay output is available. The detector also provides an analog 4-20mA output and a RS485 digital output to indicate the above events. 展開
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- 覃晴晴6 2015-08-17 00:00:00
- 好難懂---
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- 瓶子*19 2015-08-17 00:00:00
- UNIPHOS-400多參數(shù)UV / IR基于火災(zāi)探測器 通過同時檢測三個重要的消防檢測 即火的特性。在太陽盲紫外輻射 的185-260納米的區(qū)域，從熱紅外二氧化碳排放量這 不約而同地出現(xiàn)在和周圍火災(zāi)和連續(xù) 從火黑體紅外線輻射。 這種基于微處理器的探測器安裝在一個防火 外殼與觀察窗。它被安裝在一 壁掛式支架與規(guī)定進(jìn)行調(diào)整的領(lǐng)域 鑒于帶來的觀景窗在視線的可能行 那個地方火災(zāi)的危險。 該探測器給出了一個火災(zāi)報警（紅色LED亮）當(dāng)所有的 檢測到三個選擇火參數(shù)。同時 繼電器輸出可用。當(dāng)IR或UV任一項 被檢測到的輻射黃色LED發(fā)光給予警告警報 也是一個繼電器輸出可用。該檢測器還 提供模擬4-20mA輸出和RS485數(shù)字 輸出，以指示上述事件。
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- 李白iiY 2015-08-17 00:00:00
- UNIPHOS-400多參數(shù)紫外/紅外火警探測器通過同時探測三個重要的火災(zāi)數(shù)據(jù)來發(fā)現(xiàn)火情。分別是不可見光區(qū)域波長185-260納米的紫外線，火災(zāi)中間和周圍散發(fā)出的熱二氧化碳放射出的紅外線以及火焰發(fā)出的連續(xù)的黑體紅外線。這種基于微處理器的探測器被安裝在擁有觀測玻璃的防火外殼中。它可放置在壁掛架上通過調(diào)整視野來使得探測器通過觀測玻璃可檢測火情可能發(fā)生的地點。 一旦三種數(shù)據(jù)被同時探測到，探測器會發(fā)出火災(zāi)警報（紅光）。同時繼電器輸出開始工作。當(dāng)紫外線數(shù)據(jù)或紅外線數(shù)據(jù)被探測到，探測器發(fā)出黃光，繼電器輸出開始工作。探測器也提供類似的4-20毫安的電流輸出和RS485電子輸出來顯示上述各種情況。
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熱門問答
- 英語翻譯
- UNIPHOS-400 multiparameter UV/IR based Fire Detector detects fire by detecting simultaneously three important characteristics of fire viz. UV radiation in the solar blind region of 185-260 nm， IR emission from the hot CO2 which invariab... UNIPHOS-400 multiparameter UV/IR based Fire Detector detects fire by detecting simultaneously three important characteristics of fire viz. UV radiation in the solar blind region of 185-260 nm， IR emission from the hot CO2 which invariably is present in and around a fire and the continuum black body IR radiation from the fire. This microprocessor based detector is housed in a flameproof enclosure with a viewing window. It is mounted on a wall mountable stand with provision to adjust the field of view to bring the viewing window in line of sight of the likely spot where fire can occur. The detector gives a fire alarm (red led glows) when all the three chosen fire parameters are detected. Simultaneously a relay output is available. When any one of IR or UV radiation is detected yellow led glows to give a warn alarm and also a relay output is available. The detector also provides an analog 4-20mA output and a RS485 digital output to indicate the above events. 展開
2015-08-16 09:24:04
444
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- 英語翻譯
- Forexample，intest，measurement，andcontrol，engineershaveusedvirtualinstrumentationtodownsizeautomatedtestequipment(ATE)whileexperiencinguptoa10timesincreaseinproductivityga... For example， in test， measurement， and control， engineers have used virtual instrumentation to downsize automated test equipment (ATE) while experiencing up to a 10 times increase in productivity gains at a fraction of the cost of traditional instrument solutions. Last year 25，000 companies in 90 countries invested in more than 6 million virtual instrumentation channels from National Instruments. 會的人幫忙翻譯一下，我翻譯的不通順，沒有中文的感覺。請高手幫助！菜鳥級別繞道。 展開
2013-02-17 07:55:07
589
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- 英語翻譯求助
- The scheduler function involves planning how to produce the current volume of orders in the FMS， considering the current status of machine tools， work-in-process， tooling， fixtures， and so on. [91 The scheduling can be done automatically or... The scheduler function involves planning how to produce the current volume of orders in the FMS， considering the current status of machine tools， work-in-process， tooling， fixtures， and so on. [91 The scheduling can be done automatically or can be assisted by an operator. Most FMS control systems combine automatic and manual scheduling; the system generates an initial schedule that can be changed manually by the operator. The dispatcher function involves carrying out the schedule and coordinating the activities on the shop floor， that is， deciding when and where to transport a pallet， when to start a process on a machining center， and so on. The monitor function is concerned with monitoring work progress， machine status， alarm messages， and so on， and providing input to the scheduler and dispatcher as well as generating various production reports and alarm messages. A transport control module manages the transportation of parts and palettes within the system. Having an AGV system with multiple vehicles， the routing control logic can become rather sophisticated and become a critical part of the FMS control software. A load/unload module with a terminal at the loading area shows the operators which parts to introduce to the system and enables him or her to update the status of the control system when parts are3. Materials Handling System The automated materials handling system is a fundamental component that helps mold a group of independent CNC machines into a comprehensive FMS. The system must be capable of accepting workpieces mounted on pallets and moving them from workstation to workstation as needed. It must also be able to place workpieces on hold as they wait to be processed at a given workstation. The materials handling system must be able to unload a workpiece at one station and load another for transport to the next station. It must accommodate computer control and be completely compatible with other components in the flexible manufacturing system. Finally， the materials handling system for an FMS must be able to withstand the rigors of a shop environment. Some FMSes are configured with automated guided vehicles (AGVs) as a principal means of materials handling. 展開
2009-03-31 17:58:44
556
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- 跪求英語翻譯。
- Experiment SiO2 films with a thickness of 300 nm were grown on (100) p-Si substrates， with a resistivity of 4 W cm， using thermal oxidation at 1，000 C， for 90 min. Monte Carlo simulationcode (TRIM) was used to calculate the adequate ene... Experiment SiO2 films with a thickness of 300 nm were grown on (100) p-Si substrates， with a resistivity of 4 W cm， using thermal oxidation at 1，000 C， for 90 min. Monte Carlo simulationcode (TRIM) was used to calculate the adequate energy in order to place the maximum Ge concentration at the middle of the SiO2 film. SiO2 matrices were implanted with Ge74+ ions at RT， with 250 keV energy， using implantation doses of [0.5， 0.8， 1， 2， 3 and 4] · 1016 cm–2. After ion implantation， the samples were annealed at 1，000 C for 1 h in a forming gas atmosphere to precipitate Ge and to form the nanocrystallites. Raman spectra were obtained using a triple grating T- 64000 Jobin-Yvon spectrometer， with 1 cm–1 spectral resolution. The 514 nm line of the argon laser was used to excite the samples. All samples were measured at RT; the laser power on the sample was 9 mW. The diameter of the laser spot was 50 lm and the integration time was 30 min. The resonant Raman spectra were obtained in the backscattering configuration. The orientation of the Si substrate is fundamental to polarize the laser light， allowing the second-order Raman Si peak， at about 300 cm–1， to be suppressed not masking the Raman peaks corresponding to Ge-nc. PL spectra were measured at RT with a 240 nm excitation source， using a Spex Fluoromax spectrometer with a R298 Hamamatsu photomultiplier. Compositional analysis of the SiO2 matrix was carried out using a DIGILAB infra-red Fourier transform spectrometer. The system was purged with dry N2 to reduce the infrared (IR) absorption from H2O and CO2. Transmittance measurements were carried out within the 400– 4，000 cm–1 range at 300 K. The beam spot size was about 5 mm diameter and the resolution was 4 cm–1. In all cases a non-processed Si substrate sample was used as a reference. Results and discussions Figure 1 presents the Raman spectra of the films implanted with various doses [0.5; 0.8; 1; 2; 3; 4] · 1016 cm–2， followed by annealing forming-gas， (92% N2 + 8% H2) at 1，000 C， for 1 h. The position of the peak for bulk Ge was determined at 302.4 cm–1 and this value is used to compare with Ge-nc peaks. The Raman spectra of the implanted samples clearly show three bands: 210–280， 304 and 430 cm–1. The first one， 210–280 cm–1， is associated with amorphous Ge compounds. Such band was expected as the samples have been annealed at 1，000 C， therefore above the Ge melting temperature (938.3 C) [10]. At this temperature， Ge precipitates as liquid droplets inside a viscous oxide matrix. The second band was near 304 cm–1， and can be associated with Ge-nc. This band is in good agreement with the work reported by Wu et al. [11]. Finally， the third band at 430 cm–1 is related to local Si–Si vibrations [12]. 展開
2018-12-06 19:16:01
390
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- 科技英語翻譯
- 哪位高手幫忙翻譯一下，非常感謝！??！ Casted titanium for dental crowns has been investigated by means of X-ray Photoelectron Spectroscopy (XPS)， X-Ray Di?raction (XRD) and Scanning Electron Microscopy (SEM). The samples were prepare... 哪位高手幫忙翻譯一下，非常感謝?。?！ Casted titanium for dental crowns has been investigated by means of X-ray Photoelectron Spectroscopy (XPS)， X-Ray Di?raction (XRD) and Scanning Electron Microscopy (SEM). The samples were prepared according to the Ohara process. XRD analysis revealed that the investment consisted essentially of SiO2， Mg2P2O7， SiO2?H2O and Mg2SiO4. SEM experiments combined with EDX analysis revealed the following atomic concentrations Si (62.6%)， Mg (19.7%)， P (17.1%)， and Ca (0.6%). After casting， the titanium samples exhibit a rough and irregular surface， and XRD analysis indicated that titanium contains essentially the α phase and traces of the β phase. After demoulding titanium samples， the investment side which was in contact with titanium was black colored， proving the reaction between titanium and the investment. XPS analysis performed on this side of the investment indicated that the Si 2p peak presents a shoulder on the low binding energy side and thus suggest that SiO2 has been transformed into metallic Si. 展開
2018-11-19 21:52:36
362
0
- 英語翻譯(2)
- Keywords:Epoxides;Amines;2-Aminoalcohols;Yttriumnitratehexahydrate;RegioselectivityAminoalcoholsconstituteanimportantclassofcompoundshavingbothchemicalandbiologicalapplic... Keywords: Epoxides; Amines; 2-Amino alcohols; Yttrium nitrate hexahydrate; Regioselectivity Amino alcohols constitute an important class of compoundshaving both chemical and biological applications. They are important pharmacophores present in various inhibitors and are used as building blocks for the synthesis of biologically active natural products， insecticidal agents and chiral auxillaries for asymmetric reactions.1a–f They act as starting materials for the synthesis of oxazolines which are useful in the polymer industry.1g Owing to their widespread applications， the synthesis of amino alcohols has received much attention in recent years. Traditionally， 2-amino alcohols are prepared by heating an epoxide with an excess of amine at elevated temperature. The use of a high temperature leads to undesired side reactions and also limits the applicability towards temperature sensitive substrates. To overcome these drawbacks various promoters such as ZnCl2，2 ScOTf，3 MgBr2OEt2，4 67 9 bismuth salts，5 CoCl2， CuBF4， DIPAT，8 Ti(OiPr)4， 1011 12TaCl5， ZrCl4， Sm(OTf)3， potassium dodecatungstocobaltate， 13 and aluminosilicate14 have been employed for the above transformation. The use of non-conventional techniques such as microwave irradiation at elevated temperaturehas also been reported.15 Recently， the use of Al(OTf)3 (1 mol %) as catalyst in toluene at reflux has also been reported.16 Although significant advances have been made in this area， low regioselectivity， longer reaction time， use of elevated temperature， high catalyst loading， toxic solvents and lower substrate compatibilitylimit their applications.Thus there is a need to develop an efficient catalytic protocol for ring opening of various epoxides with aliphatic， aromatic andheteroaromatic amines under ambient conditions 展開
2008-05-21 01:00:39
366
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- 藥學(xué)英語翻譯
- Havingbrieflyexaminedthestructureoforganicpackingsandthevariousroutesintheirmanufacture，themostimportantfeaturesmaybesummarizedasfollows:>Hydrophilicaswellaslipophilicorg... Having briefly examined the structure of organic packings and the various routes in their manufacture， the most important features may be summarized as follows: > Hydrophilic as well as lipophilic organic packings are synthesized with a controlled pore and surface structure depending on the type of monomer/comonomer and the polymerization reaction. Surface structure can be altered by controlled consecutive surface reactions. > In accordance with the bulk composition， polymer packings are stable across almost the entire pH range， particularly under strong alkaline conditions. > Chemical stability is affected by oxidizing and reducing solutions. > Although cross-linking reactions have been optimised in as much as rigid pressure stable particles can be manufactured， some remaining swelling property is often noted when changing the solvent composition in HPLC. > As in the manufacture of silica， porosity， pore size， and surface area of polymer packings can be adjusted over a wide range， and micro-， meso-， and macro- as well as non-porous beads are synthesized reproducibly. 3.2.4.2 Hydrophobic Polymer Stationary Phases The synthesis of cross-linked copolymers of styrene and divinylbenzene has been studied intensively and is well documented. The starting monomer is styrene， and divinylbenzene (DVB) is used as cross-linker. The amount of DVB can reach up to 55wt.%. At 55% DVB， the copolymer shows practically no swelling and possesses a permanent porosity. Figure 3.21 illustrates the network structure of poly(styrenedivinylbenzene) (St-DVB). Commercial products differ in bead size and pore size. There are even non-porous products on the market， designed for the rapid separation of peptides and proteins by reversed phase HPLC (Maa and Horvath， 1988). St-DVB copolymers are stable in the pH range 0–14. They find increasing application in the separation of low molecular weight compounds， peptides， and proteins by means of reversed phase chromatography (Tanaka et al.， 1987， Tweeten and Tweeten， 1986) and as parent materials for the synthesis of derivatized packings in interaction chromatography of biopoly-mers (Unger et al.， 1987， Regnier， 1987). Numerous other organophilic polymer packings have been synthesized for size exclusion and interactive HPLC after suitable derivatization. They are reviewed in depth by Mikes (1988). 展開
2010-11-30 04:37:20
443
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- 應(yīng)用化學(xué)專業(yè)英語翻譯
- Herein， we present a template approach that allows for the incorporation of normally labile metal centers， such as copper(I)， copper(II)， and silver(I)， into DNA branch points(Scheme 1 a). Remarkably high structural stability and chir-al... Herein， we present a template approach that allows for the incorporation of normally labile metal centers， such as copper(I)， copper(II)， and silver(I)， into DNA branch points(Scheme 1 a). Remarkably high structural stability and chir-ality transfer to the metal complex are demonstrated. More-over， we have used this approach to generate the first example of a dynamic multimetallic metal–DNA assembly， with three metal complexes as the corners， single-stranded DNA as the sides， and multiple DNA double strands at the periphery (Scheme 1 d). We demonstrate quantitative and reversible structural switching of these metal–DNA nanostructures by adding specific DNA strands， resulting in controlled modu-lation of the metal–metal distances.This contribution thus allows the programmable generation of structurally dynamic multimetallic metal–DNA assemblies， with anticipated appli-cations in nanoelectronics， nanooptics， artificial photosyn-thesis， high-density data storage， and catalysis. To create stable and electroactive metal–DNA junctions，we examined the attachment of the ligand bis(2，9-diphenyl)-1，10-phenanthroline (dpp) to DNA (Scheme 1 a). This ligand has been used by the groups of Sauvage and others to generate interwoven structures.[10]It forms complexes such as [Cu(dpp)2]+， whose redox potential falls within the compat-ible window for DNA bases (+ 0.8 to-0.7V vs. saturated calomel electrode， SCE) 展開
2013-05-02 09:56:40
546
1
- 化學(xué)專業(yè)英語翻譯
- 以Na2WO4.2H2O和Zn(NO3)2.6H2O為原料，采用水熱法制備出ZnWO4納米晶催化劑。以曙紅B為目標(biāo)降解物，研究了ZnWO4催化劑的光催化性能，探討了水熱溫度、水熱時間和水熱溶液pH值對ZnWO4催化劑的結(jié)晶形態(tài)及光催化活性的影響規(guī)律，結(jié)果表明:在酸性條件下制備的ZnWO4為片... 以Na2WO4.2H2O和Zn(NO3)2.6H2O為原料，采用水熱法制備出ZnWO4納米晶催化劑。以曙紅B為目標(biāo)降解物，研究了ZnWO4催化劑的光催化性能，探討了水熱溫度、水熱時間和水熱溶液pH值對ZnWO4催化劑的結(jié)晶形態(tài)及光催化活性的影響規(guī)律，結(jié)果表明:在酸性條件下制備的ZnWO4為片狀結(jié)構(gòu)，鏈狀分布，而在堿性條件下為棒狀結(jié)構(gòu)。在180℃，24 h的制備條件下，ZnWO4催化劑顯示出Z高的光催化活性。水熱溶液pH=5和pH=8時制得的催化劑在2 h內(nèi)對5 mg/L的曙紅B溶液的脫色率分別達(dá)到86%和95%。制備過程中溶液的pH值，催化劑的晶態(tài)和比表面積是影響催化劑活性的重要因素。 展開
2011-01-01 00:21:43
445
3
- 專業(yè)英語翻譯，急用
- This paper presents a procedure for preparing a nanofluid which is solid–liquid composite material consisting of solid nanoparticles with sizes typically of 1–100 nm suspended in liquid. By means of the procedure， Cu–H2O nanofluids with... This paper presents a procedure for preparing a nanofluid which is solid–liquid composite material consisting of solid nanoparticles with sizes typically of 1–100 nm suspended in liquid. By means of the procedure， Cu–H2O nanofluids with and without dispersant were prepared， whose sediment photographs and particle size distribution were given to illustrate the stability and evenness of suspension with dispersant. Aiming at the dispersion of nano-Cu is regarded as the guide of heat transfer enhancement， the dispersion behavior of Cu nanoparticles in water were studied under different pH values， different dispersant types and concentration by the method of zeta potential， absorbency and sedimentation photographs. The results show that zeta potential has good corresponding relation with absorbency， and the higher absolute value of zeta potential and the absorbency are， the better dispersion and stability in system is. The absolute value of zeta potential and the absorbency are higher at pH 9.5. Hexadecyl trimethyl ammonium bromide (CATB) and sodium dodecylbenzenesulfonate (SDBS) can significantly increase the absolute value of zeta potential of particle surfaces by electrostatic repulsions， and polyoxyethylene (10) nonyl phenyl ether (TX-10) can form a thick hydration layer on the particle surfaces by steric interference， which leads to the enhancement of the stability for Cu suspensions. In the 0.1% copper nano-suspensions， the optimizing concentrations for TX-10， CATB， and SDBS are 0.43， 0.05， and 0.07%， respectively， which have the best dispersion results. . 2007 Elsevier Inc. All rights reserved. Keywords: Copper nano-suspensions; Dispersion and stability; Zeta potential; Absorbency 展開
2011-05-09 17:15:02
575
2
- 機械英語翻譯網(wǎng)站
- The varying rates of thermal expansion are the basis of the bimetal thermostat. The metal stripe of the thermostat have greatly different thermal expansion coefficients. When they are bonded together and heated， the metal with the high expa... The varying rates of thermal expansion are the basis of the bimetal thermostat. The metal stripe of the thermostat have greatly different thermal expansion coefficients. When they are bonded together and heated， the metal with the high expansion rate elongates much more than the other strip. This causes the strips to bend and touch the contact point. The lead screw goes through a pair of half nuts， which are fixed to the rear of the apron. When actuating a certain lever， the half nuts are clamped together and engage with the rotating lead screw as a single nut， which is fed， together with the carriage， along the bed. The width of cut is the width of the workpiece in contact with the cutter in a direction normal to the feed. We can easily see that the width of cut should decrease with increasing depth of cut to keep the load and power requirement below those that can be met by the cutter and the machine tool， respectively. The control unit coordinates the operations of all the other components. It controls the input and output information between the computer and the outside world through the I/O section， synchronizes the transfer of signals between the various sections of the computer， and commands the other sections in the performance of their functions. 展開
2008-12-12 12:48:55
512
3
- 機械加工設(shè)備怎么英語翻譯
2016-12-11 23:09:27
506
1
- 英語翻譯，急急！！在線等
- 光譜分析儀，拉力試驗機，動平衡試驗機，金相顯微鏡，碳硫分析儀，沖天爐，地砂線，精密數(shù)控車床，精密數(shù)控磨床。翻譯成英語啊。在線等。非常急。非常感謝
2008-10-28 05:27:04
582
2
- 的英語翻譯 用英語怎么說
2017-11-28 05:12:35
1661
3
- 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
2
- 散分了，英語翻譯高手快來
- 1.INTRODUCTION The aim of this validation study has been to demonstrate that the method AD-TM-R165335-F051-POW-LD-000959-v2 is suitable for determination of the particle size distribution of R165335 – F051 by means of laser diffraction. T... 1.INTRODUCTION The aim of this validation study has been to demonstrate that the method AD-TM-R165335-F051-POW-LD-000959-v2 is suitable for determination of the particle size distribution of R165335 – F051 by means of laser diffraction. The following compounds have been used in the validation. 2. METHOD VALIDATION 2.1. Precision 2.1.1. Analysis Repeatability – test results and acceptance criteria Analysis repeatability expresses the precision of the analytical method under the same operating conditions over a short interval of time. The repeatability of the method has been determined by the 6-fold analysis of 1 sample of the drug product batch by 1 analyst on 1 day， using 1 instrument. Based on the volume distribution， for each analysis the dV10， dV50 and dV90 cumulative undersizes are reported. In addition， for each series of particle size data the averages， standard deviations， relative standard deviations (RSD)， and 95% confidence intervals are reported. For evaluation purposes， the RSD values are compared with the acceptance criteria. 2.1.2. Intermediate Precision – test results and acceptance criteria Intermediate precision expresses the within laboratory variations， e.g.different days， different analysts， etc. For this purpose， the intermediate precision of the method has been determined by 2 analysts， each analysing the product in 6-fold. The analyses have been done using 1 instrument，whereas analyst 1 performed a 6-fold analysis on day 1， and analyst 2 performed a 6-fold analysis on day 2. The validation data as obtained for the analysis repeatability testing will be used as the analyst 1 data set. Based on the volume distribution， for each analysis the dV10， dV50 and dV90 cumulative undersizes are reported. In addition， for each series of particle size data the averages， standard deviations， relative standard deviations (RSD)， and 95% confidence intervals are reported. For evaluation purposes，the RSD values are compared with the acceptance criteria. Participating Analysts: ? Analyst 1: Global Analytical Development， Method Development， Beers (Belgium) ? Analyst 2: Global Analytical Development， Stability Evaluation and Release， Beers (Belgium) 2.1.3. Conclusions The particle size method AD-TM-R165335-F051-POW-LD-000959-v2 has been demonstrated to show an adequate analysis repeatability and intermediate precision. 2.2. Robustness The robustness of the analytical method has been tested during the method development and is a measure of its capacity to remain unaffected by small but deliberate variations in method parameters. The capability of method AD-TM-R165335-F051-LD-000959-v2 to remain unaffected has been tested by varying the following parameter: 1. Slid Width (and thereby the mass flow of the product in the instrument) 2.2.1. Conclusions The robustness of the method has been demonstrated by showing the validity of the method after small deliberate changes to the slid width. 展開
2008-02-02 02:56:24
543
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- 擠出機英語翻譯。。。在線等。高分懸賞
- Simplified Flow Theory for Screw Extruders The flow behavior of a viscous liquid in the channel of an extruder screw is shown to be similar to the flow behavior of viscous liquids between infinite parallel plates， one of which is station... Simplified Flow Theory for Screw Extruders The flow behavior of a viscous liquid in the channel of an extruder screw is shown to be similar to the flow behavior of viscous liquids between infinite parallel plates， one of which is stationary and the other moving. Assuming Newtonian behavior of the liquid， a differential equation was derived which relates the rate of extrusion and the die pressure to the screw and die geometry and to the operating variables. Integrated flow equations are given for the special case in which the viscosity of the liquid is constant throughout the screw channel (isothermal extrusion). Equations are also given for the case in which the dimensions of the screw channel are functions of their position along the length of the screw. IN THE preceding paper ( 1 )o f this symposium the literature pertaining to the problem of viscous flow in extruders was reviewed. In this paper the development of simplified but more useful flow equations is presented. The synibols and nomenclature used in this paper are defined in the preceding paper (1). The flow mechanism of the viscous liquid in the helical channel of the screw can be better understood if one imagines that the channel be unrolled and laid out on a flat surface. Figure 1 shows this concept of the screw channel. If the lower plate， representing the screw surface， is held stationary and the upper plate， representing the barrel surface， is moved in the direction of the arrow， the relative motions will be the same as those existing in an extruder where the barrel is stationary and the screw rotates. Assuming that the liquid wets both surfaces， the motion of the barrel drags the viscous liquid along with it， while the stationary plate exerts an equal and opposite drag. The velocity of the liquid， relative to the screw， is a maximum at the barrel surface and zero at the screw surface. There is also a directional factor involved， since the channel is inclined at angle p to the direction of motion. Therefore， in computing the flow rate in the channel we break up the velocity into two components: one of these acts directly down the channel， and the other acts at right angles to it. We call the component which acts down the channel drag velocity， and the component which acts at right angles to this transverse velocity. At the end of the channel there is generally a die or some other restriction to flow. This sets up a pressure gradient down the channel causing a flow in the reverse direction to the drag flon. There is one other flow that must be considered. Generally the screw does not fit perfectly inside the barrel. In other words， there is a clearance between the top of the screw threads and the barrel surface. 展開
2009-03-29 12:37:44
653
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- 跪求，英語翻譯，萬分感謝?。?！急急急！??！
- In this study， active reforming catalysts for use of gasification of biomass compounds in aqueous medium were developed by depo-sition of platinum on various supports (activated carbon， titanium dioxide， alumina， single-walled and multi-wal... In this study， active reforming catalysts for use of gasification of biomass compounds in aqueous medium were developed by depo-sition of platinum on various supports (activated carbon， titanium dioxide， alumina， single-walled and multi-walled carbon nano-tubes， graphene oxide and tungsten oxide-zirconium oxide) using nanotechnological approaches in supercritical carbon dioxide media. The effects of supports and platinum reduction methods have been investigated to optimize the catalytic activity of sup-ported platinum catalyst for hydrogen-rich gas production by aqueous-phase reforming of wheat straw biomass hydrolysates and glucose solution. 展開
2013-04-23 12:18:38
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- 化學(xué)專業(yè)英語翻譯 不要翻譯工具
- D，L252單取代海因是工業(yè)生產(chǎn)D2氨基酸的重要前體[1～3]。海因酶具有底物特異性，D2海因酶(EC3151212)可轉(zhuǎn)化外消旋的D，L252單取代海因中的D型消旋體成為D2N2氨甲酰氨基酸，剩余的L252單取... D ，L252單取代海因是工業(yè)生產(chǎn) D2氨基酸的重要前體[1～3 ]。海因酶具有底物特異性 ，D2海因酶(EC 3151212)可轉(zhuǎn)化外消旋的D ，L252單取代海因中的D型消旋體成為D2N2氨甲酰氨基酸 ，剩余的L252單取代海因由于完全不被 D2海因酶所作用 ，如圖 1所示 ，先進(jìn)行消旋 ，從而使得 D ，L2海因完全轉(zhuǎn)化為光學(xué)純的 D2N2氨甲酰氨基酸 ，并進(jìn)一步被轉(zhuǎn)化為D2氨基酸。因此 ，52單取代海因的自發(fā)消旋成為L2或D2N2氨甲酰氨基酸生產(chǎn)中的一個重要的步驟。若海因的自發(fā)消旋速率遠(yuǎn)低于海因水解酶的水解速率 ，則海因的消旋將成為D2N2氨甲酰氨基酸生產(chǎn)中的一個限速步驟。目前關(guān)于 52單取代海因的消旋的文獻(xiàn)非常少 ，海因消旋的細(xì)節(jié)問題也沒有被完全揭示。 1 材料與方法 111 實驗材料 L2丙氨酸(國家生化工程ZX) 、 L2苯丙氨酸(國家生化工程ZX) 、氰酸鈉(江都化工廠) ，其他試劑為國產(chǎn)分析純試劑。 112 實驗方法 11211 52取代海因衍生物的制備 采用Henze2Speer法[4～5 ]進(jìn)行52取代海因衍生物的制備: 反應(yīng)溫度為60～80 ℃。反應(yīng)6 h后 ，加入鹽酸酸化 ，繼續(xù)加熱 8 h ，冷卻后過濾得到的固體用酒精和水的混合溶液重結(jié)晶 ，得到無色晶狀目的產(chǎn)物。因使用的氨基酸不同 ，反應(yīng)條件略有變化 ，產(chǎn)率一般為40 %～80 % ，所得的52取代海因具有和底物氨基酸相同的旋光方向。 11212 海因衍生物的消旋 a.精確稱量41000 g L252甲基海因 ，溶解于蒸餾水中 ，定容至250 mL ，測定其旋光度 ，并以此值為未消旋化的起始數(shù)據(jù)。 b.用 6 mol/ L 的 NaOH溶液調(diào)整海因溶液 pH值達(dá)810 ，90 ℃水浴2 h ，于旋光儀上測定其旋光度。 c.同 b ，依次調(diào)節(jié)溶液pH值為710、 810、 910 ，分別測定其旋光度。 d.同 b ，依次于50 ℃水浴中及室溫下恒溫2 h ，分別測定其旋光度 ，并與起始數(shù)據(jù)對比 ，計算消旋比 r ( %) :r =αt/α0 ，其中αt 為 t 時間溶液的旋光度 ，α0為溶液初始旋光度。 11213 海因的堿解 精確稱量41000 g L252甲基海因 ，溶解于蒸餾水中 ，定容至 250 mL ，用 NaOH溶液和鹽酸分別調(diào)至pH = 2、 8、 12 ， 90 ℃水浴反應(yīng)4 h ，中間取樣測定其N2氨甲酰丙氨酸濃度。 11214 海因的轉(zhuǎn)化 采用012 %的海因溶液 ，按 w (底物)∶ w (菌泥)= 1∶ 5的比例 ，于pH 915 ，溫度40 ℃下進(jìn)行轉(zhuǎn)化。 取樣:取樣10 mL ，加入 5 mL 三停止反應(yīng) ，搖勻 ，放冰箱待測。 3 結(jié) 論 311 海因的消旋遵循本文所提出的碳負(fù)離子理論 ，其消旋過程為一級反應(yīng)動力學(xué)過程。由海因消旋的半衰期可看出提高溫度和pH對海因的消旋均有利 ，但pH過高的情況下海因則會發(fā)生堿解反應(yīng)從而造成損失。 312 本文采用的海因轉(zhuǎn)化酶系中所含為 D2海因酶 ，對D2海因的轉(zhuǎn)化活性非常高 ，由此可見 ，如若采用的轉(zhuǎn)化體系中沒有消旋酶的存在 ，則海因的消旋成為海因酶轉(zhuǎn)化生產(chǎn)光學(xué)活性氨基酸的一個限速步驟。 展開
2009-06-08 13:22:45
706
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