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化工专业英语求翻译

w张女士 2013-11-13 05:23:50 386  浏览
  • Hollow polymeric spheres have been attracting increasing interest because of their potential applications, which range from targeted drug delivery to advanced functional materi- als.[1,2] Because of their hollow core structure, such poly... Hollow polymeric spheres have been attracting increasing interest because of their potential applications, which range from targeted drug delivery to advanced functional materi- als.[1,2] Because of their hollow core structure, such polymeric spheres can encapsulate large quantities of guest moleculesÐ especially those spheres with functionalities within the empty coreÐand release them at a later stage in a controlled man- ner. Although hollow polymeric spheres with dimensions in the micrometer and submicrometer regions are readily con- structedÐby layer-by-layer deposition of polyelectrolytes onto a template core,[3±6] polymerizing monomers in lipid vesi- cles,[7,8] emulsion polymerization,[9,10] pH-induced micelliza- tion of a grafted copolymer,[11] and by the assembly of posi- tively charged polyelectrolytes and negatively charged nanoparticles[12]Ðthe synthesis of hollow spheres 100 nm or less in size has only recently become the subject of research activity. Several different routes, such as the self-assembly of block copolymers in a selective solvent,[13,14] the deposition of polyelectrolytes on a decomplexable or soluble core,[15,16] and microemulsion (as well as miniemulsion) polymerization,[17,18] have been developed to form hollow polymeric nanospheres. Although some of these methods have been quite successful, these strategies require the core templates to be removed in order to create a hollow interior, or need large quantities of surfactants to form nanosized micelles. Furthermore, although the majority of the proposed applications of hollow nano- spheres or nanocapsules are concentrated in the biomedical field, most of the hollow polymeric spheres described to date are ill-suited for such purposes. Therefore, materials (in par- ticular for the surfaces of the hollow nanospheres) that are biocompatible, non-toxic, and sometimes also biodegradable, are highly desirable. Herein, we demonstrate a simple and di- rect method for fabricating hollow polymeric nanospheres with biocompatible and biodegradable macromolecules. In this approach, hollow polymeric nanospheres were formed in a completely aqueous system without the aid of surfactants, 展开

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  • 久伴派大星pM7 2013-11-14 00:00:00
    因其在从靶向给药到先进的功能材料领域的潜在应用,聚合物空心球受到越来越多的关注。由于它们的中空结构,聚合物球能包覆大量的客体分子,尤其是那些具有内空心功能的聚合物球,能在之后的阶段以受控的方式释放它们。虽然尺寸在微米和亚微米区域的空心聚合物球体很容易被一层层沉积在模板的核心聚合电解质构造而成,但是聚合单体在脂质囊泡,乳液聚合,pH诱导胶束化的接枝共聚物,和由带正电荷的聚电解质的组装和带负电的纳米粒子的空心微球的合成100nm或更小的大小,只是在Z近才成为研究活动的主题。几个不同的路线,比如嵌段共聚物在选择性溶剂的自组装,聚合电解质在不可复合的或可溶的核心的沉积,微乳液(以及实验)聚合,已经发展形成空心聚合物纳米团簇。尽管其中的一些方法已经相当成功,这些策略需要核心模板被删除以创建一个中空的内部,或者需要大量的表面活性剂形成纳米胶束。此外,虽然大多数的提出应用空心簇或所研发的纳米囊都集中在生物医学领域,大多数的空心聚合物领域描述到目前为止已经不适合这种用途。因此,材料(特别是对于表面的空心纳米团簇)是生物相容的,无毒的,有时也可生物降解性,是非常可取的。在这里,我们展示了一个简单直接的方法制造空心聚合物纳米球的生物相容性和生物降解的大分子。在这种方法中,在一个完全的含水系统形成了空心聚合物纳米球而不借助表面活性剂。

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化工专业英语求翻译
Hollow polymeric spheres have been attracting increasing interest because of their potential applications, which range from targeted drug delivery to advanced functional materi- als.[1,2] Because of their hollow core structure, such poly... Hollow polymeric spheres have been attracting increasing interest because of their potential applications, which range from targeted drug delivery to advanced functional materi- als.[1,2] Because of their hollow core structure, such polymeric spheres can encapsulate large quantities of guest moleculesÐ especially those spheres with functionalities within the empty coreÐand release them at a later stage in a controlled man- ner. Although hollow polymeric spheres with dimensions in the micrometer and submicrometer regions are readily con- structedÐby layer-by-layer deposition of polyelectrolytes onto a template core,[3±6] polymerizing monomers in lipid vesi- cles,[7,8] emulsion polymerization,[9,10] pH-induced micelliza- tion of a grafted copolymer,[11] and by the assembly of posi- tively charged polyelectrolytes and negatively charged nanoparticles[12]Ðthe synthesis of hollow spheres 100 nm or less in size has only recently become the subject of research activity. Several different routes, such as the self-assembly of block copolymers in a selective solvent,[13,14] the deposition of polyelectrolytes on a decomplexable or soluble core,[15,16] and microemulsion (as well as miniemulsion) polymerization,[17,18] have been developed to form hollow polymeric nanospheres. Although some of these methods have been quite successful, these strategies require the core templates to be removed in order to create a hollow interior, or need large quantities of surfactants to form nanosized micelles. Furthermore, although the majority of the proposed applications of hollow nano- spheres or nanocapsules are concentrated in the biomedical field, most of the hollow polymeric spheres described to date are ill-suited for such purposes. Therefore, materials (in par- ticular for the surfaces of the hollow nanospheres) that are biocompatible, non-toxic, and sometimes also biodegradable, are highly desirable. Herein, we demonstrate a simple and di- rect method for fabricating hollow polymeric nanospheres with biocompatible and biodegradable macromolecules. In this approach, hollow polymeric nanospheres were formed in a completely aqueous system without the aid of surfactants, 展开
2013-11-13 05:23:50 386 1
【生物专业英语】摘要翻译
Abstract:Heavymetals,suchascadmium,copper,lead,chromiumandmercury,areimportantenvironmentalpollutants,particularlyinareaswithhighanthropogenicpressure.Theirpresenceinthea... Abstract: Heavy metals, such as cadmium, copper, lead, chromium and mercury, are important environmental pollutants, particularly in areas with high anthropogenic pressure. Their presence in the atmosphere, soil and water, even in traces can cause serious problems to all organisms, and heavy metal bioaccumulation in the food chain especially can be highly dangerous to human health. Heavy metals enter the human body mainly through two routes namely: inhalation and ingestion, ingestion being the main route of exposure to these elements in human population. Heavy metals intake by human populations through food chain has been reported in many countries. Soil threshold for heavy metal toxicity is an important factor affecting soil environmental capacity of heavy metal and determines heavy metal cumulative loading limits. For soil-plant system, heavy metal toxicity threshold is the highest permissible content in the soil (total or bioavailable concentration) that does not pose any phytotoxic effects or heavy metals in the edible parts of the crops does not exceed food hygiene standards. Factors affecting the thresholds of dietary toxicity of heavy metal in soil-crop system include: soil type which includes soil pH, organic matter content, clay mineral and other soil chemical and biochemical properties; and crop species or cultivars regulated by genetic basis for heavy metal transport and accumulation in plants. In addition, the interactions of soil-plant root-microbes play important roles in regulating heavy metal movement from soil to the edible parts of crops. Agronomic practices such as fertilizer and water managements as well as crop rotation system can affect bioavailability and crop accumulation of heavy metals, thus influencing the thresholds for assessing dietary toxicity of heavy metals in the food chain. This paper reviews the phytotoxic effects and bioaccumulation of heavy metals in vegetables and food crops and assesses soil heavy metal thresholds for potential dietary toxicity. 用翻译软件的免回,哥也有,真诚求助高手! 展开
2010-12-13 19:23:10 520 1
急求帮我翻译一段电力专业英语文章啊!!
What's therole of the Supercapacitor? The supercapacitor resembles a regular capacitorwith the exception that it offers very high capacitance in a small package.Energy storage is by means of static charge rather than of an electro-che... What's therole of the Supercapacitor? The supercapacitor resembles a regular capacitorwith the exception that it offers very high capacitance in a small package.Energy storage is by means of static charge rather than of an electro-chemicalprocess that is inherent to the battery. Applying a voltage differential on thepositive and negative plates charges the supercapacitor. This concept issimilar to an electrical charge that builds up when walking on a carpet. Thesupercapacitor concept has been around for a number of years. Newer designsallow higher capacities in a smaller size. Whereas a regular capacitor consists ofconductive foils and a dry separator, the supercapacitor crosses into batterytechnology by using special electrodes and some electrolyte. There are threetypes of electrode materials suitable for the supercapacitor. They are: highsurface area activated carbons, metal oxide and conducting polymers. The highsurface electrode material, also called Double Layer Capacitor (DLC), is leastcostly to manufacture and is the most common. It stores the energy in thedouble layer formed near the carbon electrode surface. 展开
2013-06-11 09:00:02 456 3
求翻译这段话,化工相关的,20分奉上
ThethreelevelcontrollersareproportionalwithKC=2.ThepressurecontrollershavetheAspendefaultsettingsofKC=20and•I=12min.Thetwocompositioncontrollersaretunedsequentially... The three level controllers are proportional with K C = 2. The pressure controllers have the Aspen default settings of K C = 20 and •I = 12 min. The two composition controllers are tuned sequentially. Since the CCxD loop is blending two streams, its dynamics are fast with the composition deadtime the only dynamic element in the loop. So the distillate composition controller CCxD is tuned with the bottoms loop on manual. Then the bottoms composition controller CCxB is tuned with the distillate loop on automatic. Deadtimes of 3 min are inserted in the loops to account for composition measurement delays. Relay-feedback testing and Tyreus-Luyben settings give controller tuning constants K C = 0.40 and _ I = 37 min for the CCxB controller and K C = 22 and _ I = 13 min for the CCxD controller. 展开
2018-11-17 07:21:42 258 0
麻烦帮我翻译以下文章(生物专业英语)
The most common means of agitation of liquid media is by placing the culture vessels on a drum(for test tubes)or a disk(for flasks)slowly rotating around a near horizontal axis. This assures good aeration of the liquid cultures with little... The most common means of agitation of liquid media is by placing the culture vessels on a drum(for test tubes)or a disk(for flasks)slowly rotating around a near horizontal axis. This assures good aeration of the liquid cultures with little mechanical damage to the cells.Agitation can also be achieved by placing culture flasks on reciprocating or gyrotory platform shakers.Gyrotoy (horizontal rotary orbit)shakers are preferred over reciprocating (horizontal linear motion)ones for a variety of reasons .The performance of the gyrotory shaker is determined by the speed of agitation and angle position of the flasks,with optimal aeration occurring in flasks tilted about 45° from the vertical.A new shaker design is the "tapping" motion shaker in which the culture is agitated by a magnetic bar moving up and down.This vertical movement of the bar is less injurious to cells than rotary movement of the bar at the bottom of the flask used in some conventional culture systems. 展开
2008-05-30 20:14:03 643 2
化学专业英语·翻译·谢\(^o^)/YES!
Fig. 1 illustrates the microstructure and surface morphology of samples which include the bare substrate, the fluorinated with and without CeO2 thin film. Fig. 1a shows the initial surface state of the polished bare substrate. Some fine ste... Fig. 1 illustrates the microstructure and surface morphology of samples which include the bare substrate, the fluorinated with and without CeO2 thin film. Fig. 1a shows the initial surface state of the polished bare substrate. Some fine steaks resulting from the polishing progress are visible in the image. The surface is considerably rough and the activity of surface for magnesium alloy is various from sample to sample and within the same sample due to the presence of different phases [24,25]. In Fig. 1b, the micrograph was taken when the sample was fluorinated in the 20% HF for 20 h. There are a large number of pores and cracks on the surface of this sample; however, we cannot find the presence of remarked grinding scratches originated from the sample preparation on the surface in contrast with the bare substrate. It is well known that the magnesium alloy reacts with HF to form the fluoride coating via displacement reaction and the fluoride is insoluble, thus form a barrier on the surface of magnesium alloy. The pores and cracks distributed uneven also suggest that the activities on the surface of magnesium alloy are not very identical. The SEM image of the fluorinated sample with CeO2 thin film is shown in Fig. 1c. As can be seen from this image, most of the pores and cracks existed on the surface of the fluorinated sample have disappeared which is ascribed to the presence of CeO2 thin film. Moreover, the surface of CeO2 thin film is more uniform and more compact than that of the fluorinated sample, and this may explain why this kind of samples is the best corrosion resistant. XPS analysis is performed aiming at identifying the chemical composition of the film and the typical survey scan spectra are shown in Fig. 2. The main element peaks of Mg, C, O, F and Ce are shown in the spectra. A significant amount of carbon is present on the surface of the sample due to some contaminant that originates from the polishing, cleaning and heat-treatment procedure; moreover, there may be some remnant since the deficiently burning for celloidin during the heat-treatment. There are three peaks in the survey scan spectra as follows: Mg 2p3/2 at about 50 eV, Mg 2s at about 88 eV and Mg Auger peak at about 301 eV. The peak of Mg 2p around 50 eV is shown in Fig. 2 which reveals only one peak at 50.2 eV belonging to Mg 2p being the fingerprint for Mg2+ in the transitional region. Hence, it is most probable that the presence of Mg in the coating is a result of the formation of MgF2 in the course of the fluorinated process and the formation of MgO during the heat-treatment. Both the main components of O 1s peak located at 530.6 eV and the F 1s peak located at 684.7 eV give the evidence that the major states are MgO and MgF2. It is found that almost a pure Ce(IV) state in the spectrum of CeO2 and this is similar to these reported by Škoda et al. [26]. 展开
2009-03-30 12:58:40 364 1
请帮我翻译一段专业英语吧。。急用。。多谢。。。
Practical applications of colossal magnetoresistive(CMR) oxides are limited by the large magnetic fields and/or low temperature required to observe a significant change in electric resistivity[1-5]. In recent years,research on tunneling mag... Practical applications of colossal magnetoresistive(CMR) oxides are limited by the large magnetic fields and/or low temperature required to observe a significant change in electric resistivity[1-5]. In recent years,research on tunneling magnetoresistance(TMR) is a very active field because of its scientific interest and potential technological applications[6].Polycrystalline Sr2FeMoO6 perovskite is a candidate for magnetic sensors owing to its high ferromagnetic transition temperature …(Tc~420K)and the half-metallic electronic band structure predicted theoretically [7]. The conduction electrons in this compound are expected to be highly spin-polarized even at room temperature. More recently, perovskite Sr2FeMoO6 with nanometer grain size showed large magnetoresistance(~20%) at a low magnetic field of 4k Oe and at room temperature[8].Dai et al.[9]observed two different ordered structures in polycrystalline Sr2FeMoO6 perovskite: the double perovskite and the superstructure with tripled c-axis(ST).In this paper, another new layered structure of body-centered tetragonal phase (BT) is reported for the polycrystalline magnetoresistive Sr2FeMoO6 sample. Ceramic samples of Sr2FeMoO6 were prepared by standard solid state reaction. Stoichiometric materials of SrCO3,Fe2O3 and MoO3 were mechanically mixed, and then calcined at 950℃ for 4h in air.The calcined mixture was then ball-milled and made into pellets followed by sintering at 1250℃for 4h in carbon monoxide atmosphere.Transmission electron microscopy(TEM) specimens were prepared by mechanical polishing,dimpling and ion milling.Electron diffraction patterns were taken at 120kV using a Phillips CM12 electron microscope, and high resolution TEM imaging was conducted using JEOL 2010 microscope. Energy dispersion of X-rays(EDX) was conducted by TEM attached with EDAX PV9100. 展开
2009-05-20 03:06:41 406 1
求翻译。。。。。。。。。。。
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. 展开
2008-06-09 10:41:10 334 1
Determine the weight per milliliter by dividing the weight in g, 化工上的 求翻译
Determine the weight per milliliter by dividing the weight in g, of the quantity of liquid, which fills the pycnometer at 25°C, by the capacity expressed in ml, of the pycnometer at the same temperature.
2011-06-18 02:54:15 390 4
帮忙翻译 化工文献 在线等 拒绝使用自动翻译
Nano-sized Beta zeolites, with a crystal size of 80–100 nm, were synthesized via surface wet method. The nano-sized Hbeta zeolites exhibit much higher activity and stability in the Friedel–Crafts acylation of anisole and toluene with acet... Nano-sized Beta zeolites, with a crystal size of 80–100 nm, were synthesized via surface wet method. The nano-sized Hbeta zeolites exhibit much higher activity and stability in the Friedel–Crafts acylation of anisole and toluene with acetic anhydride than theconventional zeolites of largeparticle size.The smallcrystalsize of nano-sized zeolitesmay bringon more accessible activesites and then enhance the catalytic activity. The exposed pore openings in nano-sized zeolites allow a fast desorption of heavy products from the catalyst and can then reduce the occupancy of active sites by the adsorption of products ,this can then alleviate the catalyst deactivation and improve the catalyst stability deactivation and improve the catalyst stability. 急用 在线等 拒绝用自动翻译 因为这个谁都会 如果有超级好用的自动在线翻译或软件也可以推荐 展开
2009-05-31 04:30:04 394 4
继续求翻译
Ethylacetate(Quimis,p.a.),methanol(Quimis,p.a.),sec-butanol(Merck,HPLCgrade),oleicacid(Merck,extrapure),hydrogenperoxide(Interox,70%,w/waqueoussolution),aluminumoxideforc... Ethyl acetate (Quimis, p.a.), methanol (Quimis, p.a.), sec- butanol (Merck, HPLC grade), oleic acid (Merck, extra pure), hydrogen peroxide (Interox, 70%, w/w aqueous solution), aluminum oxide for chromatography (Fluka, 0.05–0.15 mm), aluminum oxide for column chromatography (Acros Organics, activated, acidic, 0.1–0.5 mm), aluminum tri-sec-butoxide (Aldrich, 99.99%), oxalic acid (Synth, p.a.), di-n-butyl ether (Fluka, >99%) and soybean oil (Cargill) were used as received. The solution of anhydrous hydrogen peroxide (24%, w/w) in ethyl acetate was prepared from aqueous H2O2 (70%, w/w) in ethyl acetate by azeotropic distillation with a Dean-Stark apparatus [14] The products were identified by gas chromatography–mass spectroscopy (GC–MS) using a Hewlett-Packard 5890 gas chromatograph equipped with a AT-Wax column and interfaced with a Hewlett-Packard 5971A mass spectrometer. Helium was used as the carrier gas. A similarly equipped Hewlett-Packard5890 gas chromatograph using nitrogen as the carrier gas and a flame ionization detector was used for product quantification, with the help of calibration curves. 展开
2009-03-18 10:12:57 387 3
求翻译文献
Anionsarecommonlyfoundintheenvironmentandbiologicalsystems.Forinstance,fluorideiswidelyusedindentalcareapplicationsandexhibitsinhibitionofcertainenzymefunctions.1Inadditi... Anions are commonly found in the environment and biological systems. For instance, fluoride is widely used in dental care applications and exhibits inhibition of certain enzyme functions.1 In addition to playing a central role in biological regulation, chloride is also a major groundwater contaminant that can corrode steel and concrete.2 Thyroid hormone synthesis largely determines iodine content.3 Acetate is a possible tracer for malignancies and has been extensively investigated in prostate cancer and its metastases.4 Phosphate ion is biologically and environmentally significant.5 Cyanide exerts adverse effects on human health as well as environment at low concentrations. Determining anions concentration is thus of primary concern in many areas, including food processing, industry, and clinic analysis.6 However, hydrophilic anions, such as F- and Cl-, form strong hydrogen bonds with protic solvents. Therefore, developing fluorescent probes based on electrostatic interactions for anions functioning in polar protic solvents is both challenging and currently infeasible. 展开
2009-12-15 12:42:12 365 6
求韩语翻译
3원 촉매然 백금 같은 금속으로 된 수십 나노미터 크기의 촉매 입자가 별집 &... 3원 촉매然 백금 같은 금속으로 된 수십 나노미터 크기의 촉매 입자가 별집 모양의 틀에 발라져 있는 것입니다、 求准确翻译 PS 3元催化剂是安装在汽车排气管上的 展开
2012-12-19 08:48:48 384 1
文献求翻译
Since the formation of a titanacyclopropane en route to cyclopropylamines can only occur with alkylmagnesium halides that contain a b-hydrogen atom, Grignard reagents without b-hydrogens appeared to be the most promising reagents for th... Since the formation of a titanacyclopropane en route to cyclopropylamines can only occur with alkylmagnesium halides that contain a b-hydrogen atom, Grignard reagents without b-hydrogens appeared to be the most promising reagents for the synthesis of primary tert-alkylamines from nitriles (Scheme 1). Thus propionitrile (1a), phenylmagnesium bromide (2) and Ti(Oi-Pr)4 were chosen to optimize the reaction conditions. In the protocol for the synthesis of cyclopropylamines,10 Ti(Oi-Pr)4 is already present in the diethyl ether solution of a nitrile, before two equivalents of the Grignard reagent are added. As this did not appear to be optimal for the synthesis of primary tertalkylamines, the Grignard reagent was added before Ti(Oi-Pr)4. With 2 equivalents of PhMgBr, 0.1 equivalent of Ti(Oi-Pr)4, and 1 equivalent of propionitrile (1a), the primary tert-alkylamine 8a was not formed at all. With an equimolar quantity of Ti(Oi-Pr)4, the amine 8a was produced in a low yield (11%) but with 1 equivalent of Ti(Oi- Pr)4 and 3 equivalents of the Grignard reagent 2, a 60% yield of 8a was obtained. Monitoring of the reaction by workup of aliquots of the reaction mixture showed that the first addition of 2 to form the N-magnesio derivative of the corresponding imine was rapid, whereas the subsequent second addition of the Grignard reagent 2 required heating under reflux for up to 24 hours. In tetrahydrofuran instead of diethyl ether, the amine 8a was formed in a very low yield, if at all. 展开
2012-08-31 01:19:05 380 5
求化学翻译
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). 展开
2012-03-12 11:00:58 355 2
急求翻译
我认为一个人应当将自己的优点发挥到极限,这不仅有助于挖掘其自身的Z大价值,而且能够Z大限度地实现其自身的社会价值。 我Z大的优点在于经过将近6年在武汉大学的测绘遥感专业的刻苦学习,我打下了一个非常扎实的专业基础。同时,我的思维敏捷,对于地球空... 我认为一个人应当将自己的优点发挥到极限,这不仅有助于挖掘其自身的Z大价值,而且能够Z大限度地实现其自身的社会价值。 我Z大的优点在于经过将近6年在武汉大学的测绘遥感专业的刻苦学习,我打下了一个非常扎实的专业基础。同时,我的思维敏捷,对于地球空间信息科研成果与产业化之间的关联,有很灵敏的感触和浓厚的兴趣,富有开创性思维,并有多项目的实践经验。我的缺点是没有一个自己的duchuang的核心理论或者技术,然后我认为这对于我来说也是一个机会。 明年的7月份将要取得我的硕士学位,这段 时间里我的主要任务是做好毕业设计。我打算毕业后花四年时间在加拿大滑铁卢大学环境学院完成我的博士位,目前我已经收到来滑铁卢大学研究生院的入学邀请。我之所以申请这个博士生项目的原因如下: (1)在我的硕士阶段,我参与了实验室的“5.12地震遥感信息收集与灾情评估项目组”,主要负责搜集加拿大与美国利用雷达影像在防灾减灾中的成功应用。在我这段时间的研究中我发现LiDAR技术是集激光、定位系统(GPS)和惯性导航系统(INS)三种技术与一身的空间测量新技术,其在遥感、测绘、环境监测、防灾减灾中等领域具有广阔的发展前景和应用需求。而加拿大正是以环境管理和激光雷达技术于世,这些都是ZG当前中长期发展急需发展的交叉学科和技术。我在滑铁卢的研究将是“land-based mobile LIDAR data processing and the application for Emergency Response”,相信四年之后,我学成回国,必将能够大显身手、回报祖国。 (2)ZG测绘遥感领域在科学研究上已经取得了辉煌的成就,但是在技术产业化以及本行业项目管理上,则远远落后与欧美国家,很多技术的Z高成就是论文而不是产品或者服务。学习与实习并重的合作教育(co-operative education)也是滑铁卢大学同其办学的一大特色,学生在课程进行期间将在相关机构工作以作实习,它目前进行的合作教育计划是Z大。在滑铁卢的学习,我将充分利用合作教育的机会,申请到加拿大空间信息领域的公司实习,学习他们的项目管理经验以及如何将技术转化为应用。回国后,结合ZG的国情,致力于将测绘遥感技术直接GX地应用于服务社会。 另外,我得知滑铁卢大学的孔子学院已于去年揭幕。通过我在滑铁卢大学的朋友我也了解到滑铁卢大学的孔子学院目前也十分缺乏中文老师。我已经跟那边的孔子学院的系主任取得联系,他们对我的汉语写作和表达能力十分满意并且欢迎我到他们学院志愿为为学生补习汉语。尽管我的能力有限,但是我会尽力用我的真诚和热情去帮助他们了解和欣赏美丽的ZG语言和文化,一点一点地去用行动实践我的诺言——让自己将来做一个关心社会,对社会的发展有贡献的人。 展开
2008-11-15 18:56:56 495 2
化学专业英语
10、TheuseofLewis-acidcatalystsinmodernorganichasbeenstudiedextensivelyduringthelastdecade.Nowadaystheresearchisfocusonthemoreversatile,moreselective,andmorereactivecatal... 10、The use of Lewis-acid catalysts in modern organic has been studied extensively during the last decade. Nowadays the research is focus on the more versatile, more selective, and more reactive catalyst. It has been found that gold Lewis acids are effective to catalyze the formation of C-C and oxidation reactions as the heterogeneous or the homogeneous catalysts. In particular, gold-catalyzed oxidation reactions have been applied in the epoxidation, oxidation of alcohols and aldehydes, and the oxidative cleavage of C-C double bonds. Sulfides oxidation is one of the most important organic processes, because the corresponding organosulfur compounds are versatile intermediates in organic synthesis and are useful for the preparation of biologically and medically important products. To the best knowledge, two examples of gold Lewis acid reveal the catalytic property in the reaction of sulfides to sulfoxides. 11、Anhydrous ethers is generally used as the solvent in the preparation of a Grignard reagent Actually, the ether plays a more important role in the reaction than merely that of solvent. Ether molecules combine with the various components of a Grignard reagent to form complex etherates. For example, one of the components in phenyl magnesium bromide-ether solution is a complex. 展开
2008-06-10 00:23:27 292 5
帮忙翻译下化工的英语。。用在线词典翻译部正确
A reversed-phase ion-pairing high-performance liquid chromatography (RP-HPIPC) method for the separation of a complex mixture of heparin-derived oligosacchrides has been developed by a stepwise optimization of the mobile phase, in which the... A reversed-phase ion-pairing high-performance liquid chromatography (RP-HPIPC) method for the separation of a complex mixture of heparin-derived oligosacchrides has been developed by a stepwise optimization of the mobile phase, in which the concentration of ion-pairing reagent, mobile phase pH, and acetonitrile concentration were varied. The resolution of more than 30 oligosaccharide components was obtained, under optimized conditions, in an analysis time of less than 30 min. This represents the first RP-HPLC method that can separate a complex mixture of both small and large sulfated oligosaccharides in a single chromatographic step. The heparin-derived oligosaccharides, in this mixture, can also be separated under a second set of RP-HPIPC conditions using a volatile ion-pairing reagent, tributylammonium acetate, to aid in the recovery of individual sulfated oligosaccharides. Moreover, it was possible to replace sodium chloride gradient, required for eluting highly sulfated oligosaccharides, with a fixed, low concentration of a volatile salt, ammonium acetate, by utilizing an acetonitrile gradient. This solvent system might make it possible to directly interface this RP-HPIPC separation with mass spectral analysis. 2003 Elsevier B.V. All rights reserved. Keywords: Ion-pairing reagents; Gradient elution; Oligosaccharides 展开
2010-06-01 05:49:52 613 4
高分求高手翻译,不要机械翻译
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. 能翻译多少都可以的 展开
2009-03-24 13:04:22 299 2
帮忙翻译一下化工方面的单词 英语
碱值测定器试剂移液管锥形瓶酸式滴定管甲基黄溴甲酚绿混合指示剂盐酸标准溶液摩尔/升酸式滴定管... 碱值 测定器 试剂 移液管 锥形瓶 酸式滴定管 甲基黄溴甲酚绿混合指示剂 盐酸标准溶液 摩尔/升 酸式滴定管 展开
2010-01-17 06:38:39 561 5

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