谁能帮我翻译一下这段英文文献啊

九流选手 2011-03-22 08:43:56 361 浏览

Fig. 1 shows that diamond particles are dispersed in the copper matrix. Since the diamond particles are easy to be stripped off during mechanical polishing， small pits are left on the surface of samples. When the samples were analyzed b... Fig. 1 shows that diamond particles are dispersed in the copper matrix. Since the diamond particles are easy to be stripped off during mechanical polishing， small pits are left on the surface of samples. When the samples were analyzed by electron probe for carbon， the particles displayed high carbon peaks， as shown in Fig. 2. Fig. 3 exhibits the analyzed result for extracted product of the copper–diamond composite by X-ray diffraction (XRD) analysis. It is shown that three dif- fraction peaks exist， shown as A， B and C， respectively. The interplanar distances corresponding to the three peaks and standard ones for diamond are compared in Table 1. The measured values of the interplanar distances are in good agreement with the standard ones， demon- strating that the extracted product should be the carbon in diamond state. Fig. 4(a) gives a TEM micrograph showing distribution and morphology of diamond particles (indicated as A， B， and C) in the copper–diamond composite. The calibration of interplanar distance for diffraction rings in Fig. 4(b) was given in Table 2. Compared to Table 1， it is also demon- strated that the calibrated interplanar distances for the diffraction rings conform to the standard ones of diamond. Therefore， it is believed that the graphitization of diamond particles hardly occurs after sintering at 1150–1220 K in the copper–diamond composite. Although diamond is a metastable allotropic modifica- tion of carbon， the graphitization of diamond particles in the copper–diamond composite did not occur， or the degree of graphitization was too small to be found. It is believed that the beginning temperature of graphi- tization would be associated with the purity of diamond powders. The impurities such as some metallic elements reduce the beginning temperature of diamond graphitiza- tion. When diamond is fabricated by the static synthesis method， Fe and Ni are often used as catalysts and are present in diamond as impurities to decrease the beginning temperature of graphitization [6]. It is understandable that both for the graphitization and its reverse reactions， their activation energies can be decreased by catalytic agents. Compared with the diamond fabricated by static synthesis， the diamond powders prepared by explosion method do not contain metallic impurities， thus leading to an obvious increase in the beginning temperature of graphitization. Hence， the detonation synthetic diamond might be more resistant to graphitization and probably suitable for the electric contact materials. 展开

参与评论

登录后参与评论

全部评论(2条)

clockwork_陈 2011-03-23 00:00:00

手机发不了这么多，明天再译

赞(16)

回复(0)

评论

评论
登录后参与评论
夏妍的夏天的 2011-03-23 00:00:00

Fig. 1 shows that diamond particles are dispersed in the copper matrix. 图形一展示了钻石颗粒可以分散在铜质型片里 Since the diamond particles are easy to be stripped off during mechanical polishing， small pits are left on the surface of samples. 由于这些钻石颗粒在化学抛光的过程中很容易分离出来，所以样品的表面会留下小凹痕 When the samples were analyzed by electron probe for carbon， the particles displayed high carbon peaks， as shown in Fig. 2. 当这些样品电子探针被分解时，这些微粒表现出高的碳值（carbon peak是某化学术语吧，不了解）就如2图所示 Fig. 3 exhibits the analyzed result for extracted product of the copper–diamond composite by X-ray diffraction (XRD) analysis. (图三展示了对铜钻石的提取物质用X-ray(XRD分析方法）分析的分析结果)。。 It is shown that three diffraction peaks exist， shown as A， B and C， respectively. （他说明如果衍射峰存在的话，就分别像A，B，C） The interplanar distances corresponding to the three peaks and standard ones for diamond are compared in Table 1. （这些对应三个峰的晶面间的距离，和标准值在图一中作了对比） The measured values of the interplanar distances are in good agreement with the standard ones， demon- strating that the extracted product should be the carbon in diamond state. (经过测试的晶面间的距离和标准值一致，说明这些提取物质应该是钻石形态时的碳）（神马竟然还有钻石形态，总不能是钻石州吧） Fig. 4(a) gives a TEM micrograph showing distribution and morphology of diamond particles (indicated as A， B， and C) in the copper–diamond composite. 图四A是一个TEM显微照片展示了铜钻石合成体的的分布及形态，就如ABC图所展示的 The calibration of interplanar distance for diffraction rings in Fig. 4(b) was given in Table 2. 图四晶面间的距离衍射环的校准在图表2中 Compared to Table 1， it is also demonstrated that the calibrated interplanar distances for the diffraction rings conform to the standard ones of diamond. 与一相比，他也说明了图四晶面间的距离衍射环的校准与标准样本相符 Therefore， it is believed that the graphitization of diamond particles hardly occurs after sintering at 1150–1220 K in the copper–diamond composite. 所以说，钻石颗粒的石墨化几乎不会发生在尽力了1150-1220k在铜钻化合物烧结过后 Although diamond is a metastable allotropic modification of carbon， the graphitization of diamond particles in the copper–diamond composite did not occur， or the degree of graphitization was too small to be found. （尽管钻石是碳的同素异形体，钻石的石墨化在铜钻化合物中不会发生，或者就是石墨化程度很小，没有发现） It is believed that the beginning temperature of graphi- tization would be associated with the purity of diamond powders. 我们相信石墨化的温度和钻石的纯度有关 The impurities such as some metallic elements reduce the beginning temperature of diamond graphitization. 像金属元素这些杂志，减低了需要石墨化的温度 When diamond is fabricated by the static synthesis method， Fe and Ni are often used as catalysts and are present in diamond as impurities to decrease the beginning temperature of graphitization （在用静电合成方法构造钻石时，Fe和镍是作为催化剂的，他们也作为杂质减低了钻石石墨化的温度） [6]. It is understandable that both for the graphitization and its reverse reactions， their activation energies can be decreased by catalytic agents. （这很容易理解，石墨化合它的逆向反应，他们的发生能力都会因为催化剂而降低） Compared with the diamond fabricated by static synthesis，the diamond powders prepared by explosion method do not contain metallic impurities， thus leading to an obvious increase in the beginning temperature of graphitization. （与用静电合成方法构造的钻相比石，用爆炸方法取得的钻石不包含金属杂志，提高了石墨化的起始的温度） Hence， the detonation synthetic diamond might be more resistant to graphitization and probably suitable for the electric contact materials. （因此，爆炸合成的钻石更加能抵制石墨化，同时也更合适和电接触的物质，就是带电体）

赞(3)

回复(0)

评论

评论
登录后参与评论

热门问答

谁能帮我翻译一下这段英文文献啊: Fig. 1 shows that diamond particles are dispersed in the copper matrix. Since the diamond particles are easy to be stripped off during mechanical polishing， small pits are left on the surface of samples. When the samples were analyzed b... Fig. 1 shows that diamond particles are dispersed in the copper matrix. Since the diamond particles are easy to be stripped off during mechanical polishing， small pits are left on the surface of samples. When the samples were analyzed by electron probe for carbon， the particles displayed high carbon peaks， as shown in Fig. 2. Fig. 3 exhibits the analyzed result for extracted product of the copper–diamond composite by X-ray diffraction (XRD) analysis. It is shown that three dif- fraction peaks exist， shown as A， B and C， respectively. The interplanar distances corresponding to the three peaks and standard ones for diamond are compared in Table 1. The measured values of the interplanar distances are in good agreement with the standard ones， demon- strating that the extracted product should be the carbon in diamond state. Fig. 4(a) gives a TEM micrograph showing distribution and morphology of diamond particles (indicated as A， B， and C) in the copper–diamond composite. The calibration of interplanar distance for diffraction rings in Fig. 4(b) was given in Table 2. Compared to Table 1， it is also demon- strated that the calibrated interplanar distances for the diffraction rings conform to the standard ones of diamond. Therefore， it is believed that the graphitization of diamond particles hardly occurs after sintering at 1150–1220 K in the copper–diamond composite. Although diamond is a metastable allotropic modifica- tion of carbon， the graphitization of diamond particles in the copper–diamond composite did not occur， or the degree of graphitization was too small to be found. It is believed that the beginning temperature of graphi- tization would be associated with the purity of diamond powders. The impurities such as some metallic elements reduce the beginning temperature of diamond graphitiza- tion. When diamond is fabricated by the static synthesis method， Fe and Ni are often used as catalysts and are present in diamond as impurities to decrease the beginning temperature of graphitization [6]. It is understandable that both for the graphitization and its reverse reactions， their activation energies can be decreased by catalytic agents. Compared with the diamond fabricated by static synthesis， the diamond powders prepared by explosion method do not contain metallic impurities， thus leading to an obvious increase in the beginning temperature of graphitization. Hence， the detonation synthetic diamond might be more resistant to graphitization and probably suitable for the electric contact materials. 展开

拜托！谁能帮我翻译一下这段文字？？: 摘要：在物质文明飞速发展的今天，传感器技术作为一门新兴学科已经得到了大规模的开发和应用。现在随着科学技术的进步以及电子计算机、机器人、自动控制技术和单片机嵌入系统的迅速发展，迫切需要形形的传感器。显而易见，传感器在现代科学技术领域中占... 摘要：在物质文明飞速发展的今天，传感器技术作为一门新兴学科已经得到了大规模的开发和应用。现在随着科学技术的进步以及电子计算机、机器人、自动控制技术和单片机嵌入系统的迅速发展，迫切需要形形的传感器。显而易见，传感器在现代科学技术领域中占有极其重要的地位。了解、掌握和应用传感器已成为电子专业技术人员的必需技能。本文以酒精测试仪为例，详细阐述了气体传感器的工作原理，并与实际电路相结合，对其具体工作过程进行了分析探讨，对以气敏元件为基础构成的传感器的未来发展趋势与应用也有所探讨。酒精测试仪主要应用于交通JC测试司机是否有酒后驾驶的情况出现，从而避免交通隐患，保证车辆安全行驶。与之相关的气体传感器设备如：有毒气体报警器、自动去湿装置、自动空气净化换气扇等也逐渐出现在人们的视线中，可见传感器技术在人们日常生活中所起的作用越来越大。通过阅读本文，读者可以了解到气体传感器的工作原理、理论基础和实际应用。关键词：气体传感器酒精半导体气敏元件展开

请翻译一下这段英文1，谢谢: Materials For the present study， the matrix was ABS supplied by Formosa Co. The reinforcements were polyacrylonitrile based high strength CFs. The properties of materials used were given in Table 1. Carbon fibre surface treatment Carbon fi... Materials For the present study， the matrix was ABS supplied by Formosa Co. The reinforcements were polyacrylonitrile based high strength CFs. The properties of materials used were given in Table 1. Carbon fibre surface treatment Carbon fibres were oxidised by boiling in HNO3 under reflux for 5 h (T5120uC). Afterwards， the nitric acid oxidised fibres were washed with distilled water to neutral pH. Fibre surface composition The fibres were characterised by X-ray photoelectron spectroscopy (ESCA 300， Scienta， Sweden) to determine the level of functionalisation of the modified fibres. An initial survey scan was performed to determine the detectable elements， followed by high resolution scans. The entire X-ray photoelectron spectrum was energy referenced to the C1s peak of graphite (bending energy5284?5 eV). Composite preparation Before processing， ABS pellets and CFs were dried in a vacuum oven for 4 h at 80uC. Composites containing 0， 5， 10， 15， 20， 25 and 30 wt-% SCF were prepared by melt mixing in a co-rotating twin screw extruder (Thermoprism TSE 16 TC， L/D:24). The ABS pellets and CFs were fed from the main and side feeders respectively. The molten composite obtained from the die of the extruder was water cooled and pelletised. The extrusion conditions were arranged， as shown in Table 2. The viscosity of the melt containing CFs depends on the viscosity of the polymer matrix as well as the processing temperature. To avoid unfavourable shearing conditions， the melt temperature is kept as high as possible regarding thermal degradation. Before PA6 was blended to promote interfacial adhesion， vacuum drying of the ABS and PA6 pellets was carried out at 80uC for 4 and 12 h respectively. The 0， 10， 20 and 30 wt-% PA6 containing batches were fed through the main feeder to the twin screw extruder. The extrudate was water cooled and chopped into small pellets. The produced ABS/PA6 pellets were vacuum dried again at 80uC for 12 h. To prepare the SCF reinforced ABS/PA6 composites， the blend was introduced into the twin screw extruder from the main feeder， and SCFs were fed from the side feeder. The twin screw extruder was operated at the same processing conditions used during the blend preparation. The extrudate was again water cooled and chopped into small pellets. The extrusion grades of resin were used to make the extrudate form fully. The specimens for the mechanical characterisation experiments were moulded using a laboratory scale injection moulding machine (microinjector， model 1998; Daca Instruments) at a barrel temperature of 230uC and mould temperature of 80uC. The injection moulding machine used in this study was a laboratory type microinjector. The principle of the operation is that the preweighed (，2?5 g) raw material is loaded into the cylindrical barrel and allowed to melt at a preset barrel temperature for 1 min.Then the molten plastic is pushed through an injection tip by a piston. 展开

？？？？？谁能帮我翻译几个英文——激光雷达？？？？？: 关于激光雷达的论文 1、LO 2、header board 3、inductive beams

谁能翻译这段英文，化学专业方面的，很难: This work examines the behaviour of fluorine modified b-PbO2 electrodes in the processes of O2 and O3 evolution in sulphuric acid. The electrochemical kinetic analyses of these processes are based on quasi-steady-state polarisation and impe... This work examines the behaviour of fluorine modified b-PbO2 electrodes in the processes of O2 and O3 evolution in sulphuric acid. The electrochemical kinetic analyses of these processes are based on quasi-steady-state polarisation and impedance data. The good agreement between the two sets of measurements allows some basic conclusions to be drawn. In particular， the O2 evolution process is always inhibited at F-doped PbO2 electrodes， and impedance results suggest possible changes in the mechanism， with electrodesorption of intermediates becoming more important as the concentration of the doping element increases. The interpretation of the data for the less positive potentials region invokes the specific adsorption of SO4 as a factor influencing the kinetics of O2 evolution. The current efficiency for O3 formation as a function of the amount of NaF added to the PbO2 growth solution reaches a maximum for a concentration of 0.01 mol dm3. A plausible cause for the decrease on the higher concentration side is the discharge of adsorbed SO4 2 (or HSO4 ) eventually yielding persulphate. This reaction is known to be favoured in the presence of a relatively high amount of fluoride in the electrolyte. An analysis of the results of modified neglect of diatomic differential overlap (MNDO) calculations on Pb cluster models and of X-ray photoelectron spectroscopy (XPS) data suggests that the coverage by weakly adsorbed oxygen species (OH and H2O) is an important parameter that is influenced by F-doping. © 1999 Elsevier Science Ltd. All rights reserved. 展开

急！！！谁能帮我翻译一下？万分感谢！: Definitions: APQP ASDE BOM EPR ESWP Advanced Product Quality Planning Advanced Supplier Development Engineer Bill of Material Early Program Review Early Sourcing Work Plan. A report including Commodity Classification (Metals，... Definitions: APQP ASDE BOM EPR ESWP Advanced Product Quality Planning Advanced Supplier Development Engineer Bill of Material Early Program Review Early Sourcing Work Plan. A report including Commodity Classification (Metals， Non- Metals， Electrical/electronics)， source-required dates， cost targets， and production tooling kick-off required dates for all purchased components. The document representing the European ESWP is On Track， the NA is PPTM. Procedure # VP-014 LRR On Track PPAP PPTM PSW RPC SDE SOP SPE VPDS vTPS Procedure: Launch Readiness Review European version of the Early Sourcing Work Plan (ESWP) Production Part Approval Process Purchased Parts Tracking Matrix (ESWP/PPTM): The North American version of the ESWP. The ESWP/PPTM is an Access Database maintained by NA Program Purchasing (vTPS) to capture all Forward Model Purchase Component information. Part Submission Warrant Regional Program Coordinator is a function within SPE in Europe and South America. Supplier Development Engineer Start Of Production (sometimes referred to as Job 1) Supplier Performance Engineer (combined ASD and SD Engineer) Visteon Product Development System ， PD/Program Management Gateway process used to manage the successful launch of new model programs. The North American data storage system which holds all PPTM/ESWP data. vTPS is an Access Database Responsibility: Process Map/Flowchart (1) Lead: RPC/SPE (EU & SA) (1) Lead – ASDE (NA & Asia) Conduct High Impact Assessment assign ASD / SP engineer on formal W/support from: Program sourcing and / or change of BOM. Buyer PD Engineer Program Manager – All Regions (2) Notes/Deliverables (1) Inputs:  ESWP or local equivalent from VP-040 Project Supply Management Outputs:  High Impact Assessment Form (VF-014a or local equivalent) Notes:  Conduct High Impact Assessment and record results per local work instructions (2) Lead: RPC/SPE (EU & SA) Lead – ASDE (NA & Asia) W/support from: Program Buyer - All Regions， Buyer - All Regions (3) Lead: Program Buyer (NA & EU & Asia) Lead: RPC/SPE (SA) (4) No No (2) Is the part High Impact? (3) Can Supplier achieve PSW Timing? Yes Go to Step # 5. Yes Go to Step # 8. (3) Notes:  Record PPAP status on local tracking system. (4) Hard Copies of This Document are Uncontrolled Page 2 of 4 (4) Acceptable risk to Yes 展开

求助，英文文献翻译~: PMMA has good compatibility with PVC due to specific interaction of a hydrogen bonding type between carbonyl groups (C=O) of PMMA and hydrogen from (CHCl) groups of PVC (Belhaneche-Bensemra et al.， 2002; Ramesh et al.， 2002). Zhou et al... PMMA has good compatibility with PVC due to specific interaction of a hydrogen bonding type between carbonyl groups (C=O) of PMMA and hydrogen from (CHCl) groups of PVC (Belhaneche-Bensemra et al.， 2002; Ramesh et al.， 2002). Zhou et al. (2001) studied the relationship between the coating thickness of PMMA on the surface of talc and mechanical properties of PMMA-g-talc/PVC composites， and found that there existed a critical thickness. Xie (2001) found that the PMMA coating on talc improved the dispersion of talc in the PVC matrix and enhanced the interfacial adhesion between talc and PVC. There appears to be a critical coating thickness of PMMA on the talc surface for optimum toughening. Quan et al. (2002) reported improved toughness and intension of the PVC composites filled with CaCO3/ACR core-shell complex particles prepared by in-situ emulsion polymerization of acrylic ester. In the present work， PMMA coated on the surface of CaCO3 nanoparticles by in-situ emulsion polymerization was characterized by FT-IR and 1H-NMR. The effects of PMMA thickness and particle fraction on the mechanical properties of PMMA-coated CaCO3 /PVC nanocomposites were also investigated. 展开

求助，英文文献翻译！: 2. Experimental 2.1 Materials Nano-CaCO3 particles (D50: 30−70 nm by TEM (Fig. 1) and BET: ca.17m2·g-1) were supplied by Shanghai Zhuoyue Nanotech Corporation. Methyl methacrylate (MMA， Shanghai Lingfeng Chemicals) was purified ... 2. Experimental 2.1 Materials Nano-CaCO3 particles (D50: 30−70 nm by TEM (Fig. 1) and BET: ca.17m2·g-1) were supplied by Shanghai Zhuoyue Nanotech Corporation. Methyl methacrylate (MMA， Shanghai Lingfeng Chemicals) was purified by distillation under reduced pressure; potassium persulphate (K2S2O8， initiator， Shanghai Lingfeng Chemicals) was of chemical grade. Silane coupling agent A174 (γ-methacryloxypropyltrimethoxysilane) was purchased from Shanghai Yaohua Factory. Polyvinylchloride (PVC， WS-1000S) was supplied by Shanghai Chlor-Alkali Chemical Co.， Ltd. Fig. 1 Morphology of untreated CaCO3 nanoparticles. Fig. 2 Morphology of PMMA-coated CaCO3 nanoparticles. 2.2 PMMA emulsion polymerization on CaCO3 nanoparticles 2.2.1 Surface silanation of nano-CaCO3 particles The nano-CaCO3 particles were homogeneously dispersed in ethanol (solid content 20%) by a sonication dispersion equipment. The slurry was then heated to 80°C with stirring， and the silane coupling agent A174 (5%， calculated based on the weight of nano-CaCO3 particles) was added into the slurry. After the slurry was stirred for 120 min at 80°C， it was filtered and the filter cake was then dried at 120°C in low vacuum for 120 min to obtain silanated CaCO3 powders. 展开

求翻译英文文献: 2.2. Material Characterizations. A field emission scanning electron microscope (SEM， JEOL 6701F) was used to investigate the morphologies， particle sizes of the samples. Transmission electron microscopy and elemental compositions of the ... 2.2. Material Characterizations. A field emission scanning electron microscope (SEM， JEOL 6701F) was used to investigate the morphologies， particle sizes of the samples. Transmission electron microscopy and elemental compositions of the samples were determined by JEM-2100F (JEOL) coupled with an energy-dispersive X-ray spectroscopy (EDX， Phoenix) system. Wide-angle and low-angle X-ray powder diffraction (XRD) of the as-obtained samples were recorded on a Rigaku D/max-2500 with Cu Kα radiation (λ = 1.540 56 Å) operated at 40 kV and 200 mA. Raman measurements were performed using a DXR from Thermo Scientific with a laser wavelength of 532 nm. To calculate the pore size distribution and pore volumes， the nitrogen absorption and desorption isotherms were measured at 77.3 K with an Autosorb-1 specific surface area analyzer from Quantachrome. The content of N in N-doped porous carbon was determined by NHC elemental analysis using Flash EA 1112. Thermogravimetric (TG) analysis of S/C composite was performed on TG/DTA 6300 in an N2 flow to obtain the S content in the composite. A four-contact method was applied to measure the powder electronic conductivity of porous carbons. The powder sample was pressed to disk at 4 MPa with two stainless-steel plungers， whose resistance was measured by a Keithley 2400 digital multimeter in fourwire mode. The conductivity of the sample was calculated according to the resistance and the size of the disk. Information of the surface elements was obtained by X-ray photoelectron spectroscopy (XPS) performed on the Thermo Scientific ESCALab 250Xi using 200 W monochromatic Al Kα radiation. The 500 μm X-ray spot was used for XPS analysis. The base pressure in the analysis chamber was about 3 × 10−10 mbar. All reported data of XPS binding energy are calibrated based on the hydrocarbon C 1s line at 284.8 eV from adventitious carbon. Spectra were fitted with Lorentzian−Gaussian functions and smart background using Thermo Avantage software. 展开

纳米材料英文文献加翻译:

谁帮我翻译一下: LabVIEWTM(LaboratoryVirtualInstrumentEngineeringWorkbench)isapowerfulinstrumentationandanalysisprogramminglanguageforPCsrunningMicrosoftWindows，SunSPARCstations，AppleMaci... LabVIEWTM (Laboratory Virtual Instrument Engineering Workbench) is a powerful instrumentation and analysis programming language for PCs running Microsoft Windows， Sun SPARCstations， Apple Macintosh computers， Concurrent PowerMax， and HP-UX workstations. LabVIEW departs from the sequential nature of traditional programming languages and features a graphical programming environment and all the tools needed for data acquisition， analysis， and presentation. With this graphical programming language， called “G，” you can program in a block diagram notation， the natural design notation of scientists and engineers. After you create a block diagram program， LabVIEW compiles it into machine code. LabVIEW integrates data acquisition， analysis， and presentation in one system. For acquiring data and controlling instruments， LabVIEW supports RS-232/422， IEEE 488 (GPIB)， and VXI， including Virtual Instrument Software Architecture (VISA) functions， as well as plug-in data acquisition (DAQ) boards. An instrument library with drivers for hundreds of instruments simplifies instrument control applications. For analyzing data， the extensive Analysis library contains functions for signal generation， signal processing， filters， windows， statistics， regression， linear algebra， and array arithmetic. Because LabVIEW is graphical in nature， it is inherently a data presentation package. LabVIEW can generate charts， graphs， and customized， user-defined graphics. 尽量翻的好一点，谢谢能不能对GOOGLE自动翻译过的稍加修改下展开

通信方面的英文文献翻译！！: 以下是文献的一部分，愿意帮忙的高手留下邮箱，我把文件发给你，若能完成，加分：SpatialCompressiveSensingApproachForFieldDirectionalityEstimation.I.INTRODUCTIONVarietyoft... 以下是文献的一部分，愿意帮忙的高手留下邮箱，我把文件发给你，若能完成，加分： Spatial Compressive Sensing Approach For Field Directionality Estimation. I. INTRODUCTION Variety of techniques for field directionality estimation were studied in literature [1]-[5]. Thus， a theoretical analysis of the relationship between the hydrophone array output and the noise field was conducted in [1]-[5]. The developed techniques were based on the array beamformer output or the crossspectral matrix between outputs of array elements [4]-[5]. The problem of a field directionality estimation in ocean， using horizontal line towed array was also addressed in literature [5]- [8]. Recently， problems of direction of arrival and field directionality estimation for moving sensors arrays have attracted renewed interest [9]-[12]. It was shown that an array motion can improve an array performance assuming temporal coherence of successive samples [10]-[11]. In [12]， the wavefield sampling method that exploits the linear relationship between the noise field and the collection of beamformer outputs over various array orientations was proposed. It was shown that the wavefield sampling (WS) method outperforms other tested methods. This algorithm was implemented via the recursive estimation method and its convergence to the unique solution was promised for a specific set of array orientations and beamformer look directions. However， a method for a proper array orientation and beamformer look direction sequence selection remains an open question. The quality of the field directionality estimation is determined by the angular resolution. The higher angular resolution is， the more accurate estimation of the far field sources， and better detection performance can be achieved. One of fundamental relations in the array signal processing is that the angular resolution is directly proportional to the number of the array elements [13]. This relation motivates the desire for longer arrays that can achieve higher resolution. Unfortunately， the requirement contradicts the implementation and installation limitations that motivate shorter arrays. Moreover， implementation of longer arrays for maneuvering platforms such as unmanned underwater vehicles (UUV) can even be impossible [14]. These contradictions motivate the quest for alternative array signal processing methods. Usually， the field directionality is modeled as a finite set of strong far-field narrow-band sources and an isotropic lowpower noise [1]. In this work， the model of the field directionality is adopted in the following way. First， the bearing angle space is uniformly sampled into a large number of discrete angles. Next， it is assumed that ether the high energy that corresponds to the far-field strong sources or the low-energy that corresponds to the isotropic noise is received at the sensor array from every of these discrete azimuth angles. 展开

谁能帮我系统的介绍一下糖尿病啊??: 1.平常应该吃什么?不应该吃什么?2.什么药物(市场能买到的?)3.有什么主义的事项?4.病理... 1.平常应该吃什么?不应该吃什么? 2.什么药物(市场能买到的?) 3.有什么主义的事项? 4.病理展开

谁帮我翻译一下，谢谢: ···until TLC analysis indicated the absence of dipolarophile.

翻译翻译，请高手帮我翻译一下这个说明: Followthesysteminstallationinstructionscarefullyandinthespecifiedorder.ThesoftwaremustbeinstalledonthecomputerbeforeconnectingtheUSBcable.2.1FacilitiesRequirementsFacilit... Follow the system installation instructions carefully and in the specified order. The software must be installed on the computer before connecting the USB cable. 2.1 Facilities Requirements Facilities requirements for the alpha-SE system are listed in Table 2-1 and the system dimensions are given in Fig. 2-1. As shown in Fig. 2-2， the alpha-SE tool requires a clear work area of 20 by 18 inches (500 by 460 mm)， excluding the operator computer. 2.2 Unpacking the Hardware Opening the Shipping Container Move the alpha-SE shipping container to the area where the tool will be installed. Open the container and remove the top and side pieces of packing foam. Carefully remove all smaller components from the shipping container， verifying that you received all components， as shown in Fig. 2-3. Finally， remove the alpha-SE ellipsometer and position it on your clear 20” by 18” (510 by 460 mm) workspace. Caution: The alpha-SE ellipsometer without sample chuck weighs approximately 37 lbs. (16 kg.). Please find an assistant to lift the alpha-SE unit out of the shipping carton and on to clear work surface. 展开

这段韩语怎么翻译:

这个万用表面板按键上的英文谁能帮忙翻译一下，非常感谢:

请高手帮我翻译一下这一段。。。: 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. 展开

能帮我翻译一下吗？谢谢: 能不能帮我翻译一下这几句话啊？（1）HeterOgeneous Green Catalyst for Oxidation of Cyclohexene and Cyclooctene with Hydrogen Peroxide in the Presence of Host(Nanocavity of Y—zeolite)／Guest(N4一Cu(II) Schif Base Complex)Nanocomposite... 能不能帮我翻译一下这几句话啊？（1）HeterOgeneous Green Catalyst for Oxidation of Cyclohexene and Cyclooctene with Hydrogen Peroxide in the Presence of Host(Nanocavity of Y—zeolite)／Guest(N4一Cu(II) Schif Base Complex)Nanocomposite Material （2）Department of Chemistry，Faculty of Science，Alzahra University Vanak，Tehran，P.O ．1993891176，Iran (3)Department of Chemistry，K．N Toosi University of Technology， Tehran P O．Box 16315-1618．Iran （4）Incorporation of copper(II)in NaY(metal exchanged Y-zeolite 谢谢啦！展开

大哥大姐谁帮我翻译一下: Since its advent in the early 1970s the logic analyser has become arguably the most important single piece of test equipment in the digital designer’s armoury. It is now a far more versatile instrument than its early predecessors， still ... Since its advent in the early 1970s the logic analyser has become arguably the most important single piece of test equipment in the digital designer’s armoury. It is now a far more versatile instrument than its early predecessors， still offering a complete solution to today’s ever more complex digital design and measurement challenges. As with most modern test equipment， the ongoing development of logic analysers has been fuelled by continual improvements in microprocessor technology， allowing cost-effective implementation of advanced measurement techniques. This continual development has been driven， to a great extent， by the need to be able to debug complex microprocessor-based or highspeed state machine designs. As the inclusion of microprocessor or VLSl components into circuit design becomes more and more routine， the instrument manufacturer must maintain the logic analyser as a user-friendly， relatively-low-cost solution to modern digital design and test problems. In addition， however， as these components increase in both complexity and performance， the instrument manufacturer must be able to support state-of-the-art measurement techniques， while still offering the digital design engineer the same depth of general-purpose circuit analysis.Clearly， as design complexity increases， an increasing volume of measurement data must be represented and manipulated in such a way that it can be quickly and easily interpreted by the engineer. The basic logic analyser provides a means of monitoring software execution， digital hardware operation and， more importantly to many， the interaction between the two. Being the only instrument that can comprehensively bridge this notional divide between hardware and software， the logic analyser is often given the role of arbitrator in the search for that elusive system bug. 展开

仪器网（yiqi.com）欢迎您！

联系我们

关注我们