藥學(xué)英語翻譯

宛新東海 2010-11-30 04:37:20 443 瀏覽

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

參與評論

評論

登錄后參與評論

全部評論(2條)

一粒粟9 2010-12-01 00:00:00

簡單的結(jié)構(gòu)有了有機(jī)包裝，不同的路線在他們的制造、Z重要的特征可歸納如下: >親水性以及合成有機(jī)包裝親與控制毛孔及表面結(jié)構(gòu)的負(fù)載量單體/單體含量和聚合反應(yīng)。能夠改變表面結(jié)構(gòu) 連續(xù)控制表面的反應(yīng)。根據(jù)大多數(shù)>組成、聚合物填料是穩(wěn)定的理解幾乎整個pH范圍，特別是在強(qiáng)堿性條件下。 >的化學(xué)穩(wěn)定性是受氧化性和減少的解決方案。 >雖然交聯(lián)反應(yīng)被優(yōu)化一樣，作為剛性的壓力我們可以生產(chǎn)穩(wěn)定粒子，有些剩下的腫脹財產(chǎn) 經(jīng)常注意變更溶劑成分在GX液相色譜。在生產(chǎn)》和白炭黑、孔隙度、孔徑、和表面面積的聚合物包裝可在一范圍內(nèi)自由調(diào)整——、中觀和微觀3 -，和宏觀- 可以作為合成珠子層。 3.2.4.2疏水性聚合物固定階段交聯(lián)共聚物的合成、苯乙烯、divinylbenzene的深入鉆研了和有明文規(guī)定。開始單體苯乙烯、 divinylbenzene(DVB)，是用來作為調(diào)控涂飾劑。數(shù)字移動電視的數(shù)量可達(dá) 55wt. %。對他們來說很有效果DVB、共聚物幾乎沒有腫脹，擁有了的孔隙度。圖3.21說明了網(wǎng)絡(luò)結(jié)構(gòu)對聚酯styrenedivinylbenzene) (St-DVB)。珠大小不同的商業(yè)產(chǎn)品和孔徑。甚至有層產(chǎn)品在市場上，設(shè)計(jì)的快速多肽和蛋白質(zhì)的分離通過反相GX液相色譜法(共和Horvath，1988)。St-DVB共聚物是穩(wěn)定的 0-14 pH范圍。他們發(fā)現(xiàn)越來越多地應(yīng)用低分子分離重量肽段和蛋白質(zhì)的化合物，通過反相色譜 (田中、蘇達(dá)權(quán)等，1987年，Tweeten和Tweeten，1986年)，作為父母的材料結(jié)果的綜合作用色譜填料biopoly-mers(Unger蘇達(dá)權(quán)等，1987年，Regnier，1987)。不計(jì)其數(shù)的其他organophilic聚合物合成了包裝大小排斥和互動GX液相色譜(HPLC)經(jīng)過合適的 derivatization。他們等方面的研究進(jìn)展，麥克一家深度(1988)。

贊(8)

回復(fù)(0)

評論

評論
登錄后參與評論
石上清泉1118 2010-12-01 00:00:00

簡略的查看有機(jī)包裝物的結(jié)構(gòu)和他們各種各樣的生產(chǎn)途徑，Z重要的特點(diǎn)可以總結(jié)如下：》親水性和親脂性有機(jī)包裝都是經(jīng)過一種可控的小孔和表面結(jié)構(gòu)合成的，這種結(jié)構(gòu)取決于單體|單聚體以及聚合反應(yīng)的類型。表面的結(jié)構(gòu)可以通過連續(xù)的表面反應(yīng)來改變。》與原始組成一致，多聚體包裝在整個PH范圍內(nèi)都穩(wěn)定，特別是強(qiáng)堿性環(huán)境。》化學(xué)穩(wěn)定性受到氧化性和還原性溶液的影響。》盡管交聯(lián)耦合反應(yīng)已經(jīng)在盡可能多的嚴(yán)格壓力下被優(yōu)化，穩(wěn)定的粒子可以制備出來，當(dāng)GX液相色譜法中的溶劑成分改變的時候，一些膨脹性質(zhì)經(jīng)常會注意到。》像硅膠的制作過程一樣，多聚體包裝的多孔性，孔徑大小和表面積可以在寬范圍內(nèi)調(diào)節(jié)，微的，內(nèi)消旋的，巨大的和無孔的玻璃粉可以可再生的合成。 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~· 我是藥英專業(yè)的學(xué)生，才疏學(xué)淺，半段文字翻譯了近半個小時，慚愧，你看看翻譯的是否可以，如果明天還沒有滿意答案，我會繼續(xù)翻譯下半段，晚安。 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~· 早上好，我繼續(xù)翻譯下面的 3.2.4.2。疏水的多聚體固定相苯乙烯和二乙烯基苯的交聯(lián)耦合共聚體的合成已經(jīng)被深入研究和很好的證實(shí)了。起始的單聚體是苯乙烯，二乙烯基苯作為耦合交聯(lián)劑。二乙烯基苯的量可以達(dá)到55wt.%(WT是什么意思我也不懂）在二乙烯基苯是55%時，共聚體幾乎沒有腫脹并且具有恒定的多孔性。圖3、21闡明了苯乙烯二乙烯基苯共聚體的框架結(jié)構(gòu)。商業(yè)產(chǎn)品在玻璃粉的尺寸和孔徑大小方面有差異。在市場上甚至有無孔的產(chǎn)品，它是為在反相GX液相色譜法中快速分離蛋白質(zhì)和肽類而設(shè)計(jì)的。(Maa and Horvath這兩個人在， 1988年).苯乙烯和二乙烯基苯聚合物在PH0-14穩(wěn)定。他們發(fā)現(xiàn)了依靠反相色譜分離小分子化合物，肽類和蛋白質(zhì)這種應(yīng)用的增加(Tanaka等人于1987和Tweeten and Tweeten二人與1986) 和在生物多聚體的交互色譜中合成衍生物包裝材料的過程中作為母體的增加。(Unger等人于1987， Regnier于1987)。大量的其他親有機(jī)物質(zhì)的聚合物包裝材料在合適的衍生反應(yīng)下通過空間排阻色譜和交互色譜被合成。他們被在1988年被Mikes 深入研究。我譯完了，希望能對你有幫助

贊(11)

回復(fù)(0)

評論

評論
登錄后參與評論

登錄或新用戶注冊

微信登錄
密碼登錄
短信登錄

請用手機(jī)微信掃描下方二維碼
快速登錄或注冊新賬號

微信掃碼，手機(jī)電腦聯(lián)動

注冊登錄即表示同意《儀器網(wǎng)服務(wù)條款》和《隱私協(xié)議》

熱門問答

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

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

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

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

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

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

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

藥學(xué)類英文翻譯?。?！急！??！: bicyclam coreceptors Cyclams Monocyclam pphenylenebis Bipharmacophore covalentlycoupled metalcyclams dizinc

藥學(xué)是干什么的？: 是學(xué)哪些東西的，畢業(yè)了可以做什么工作？

藥學(xué)專業(yè)畢業(yè)論文如何寫？: 本人就讀成人大專藥學(xué)專業(yè)，工作忙又要讀書！希望大家提供下藥學(xué)專業(yè)畢業(yè)論文參考資料！拜托了??！謝謝！謝謝！~... 本人就讀成人大專藥學(xué)專業(yè)，工作忙又要讀書！希望大家提供下藥學(xué)專業(yè)畢業(yè)論文參考資料！拜托了??！謝謝！謝謝！~ 展開

藥學(xué)的干熱滅菌名詞解釋:

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

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

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

機(jī)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

冰霜這種藥學(xué)名叫什么:

現(xiàn)代藥學(xué)的發(fā)展特征？:

機(jī)械加工設(shè)備怎么英語翻譯:

英語翻譯，急急??！在線等: 光譜分析儀，拉力試驗(yàn)機(jī)，動平衡試驗(yàn)機(jī)，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

紅外光譜儀在藥學(xué)中的應(yīng)用: 需要一篇小的議論文，介紹紅外光譜的應(yīng)用，尤其在藥學(xué)領(lǐng)域！希望能快點(diǎn)有答案! 急急急??！!

4月突出貢獻(xiàn)榜

推薦主頁

藥學(xué)英語翻譯

聯(lián)系我們

關(guān)注我們