高分求翻译在线等有点长请耐心点，我可以追加分阶段大侠帮忙

梦殇国际丶乒ds 2009-06-04 01:23:43 320 浏览

1. NOTE The Effect of Lanthanide Oxides as a Support for Ruthenium Catalysts in Ammonia Synthesis 2. Ruthenium is known to show significant activity for ammonia synthesis， particularly when promoted with alkali metal compounds， some showin... 1. NOTE The Effect of Lanthanide Oxides as a Support for Ruthenium Catalysts in Ammonia Synthesis 2. Ruthenium is known to show significant activity for ammonia synthesis， particularly when promoted with alkali metal compounds， some showing greater activity than iron catalysts under atmospheric pressure (1， 2). In fact， ruthenium catalysts may be regarded as second-generation ammonia catalysts right alongside iron catalysts. Currently， a type of ruthenium catalyst is already being used in a commercial ammonia plant (3)， proving its potential for promising applications in industry. 3. In conclusion， we found that lanthanide oxides (CeO2， Sm2O3， La2O3) were the most effective supports for ammonia synthesis. Furthermore， a significant increase in activity was observed by reduction at high temperatures. Among lanthanide oxides， Ru/Sm2O3 and Ru/La2O3 were found to be more active while only Ru/CeO2 maintained stable activity for a long period of time. Our further studies will focus on the role hydrogen poisoning playing in these systems. 展开

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我的爱断线 2009-06-05 00:00:00

1.注意影响稀土氧化物作为支持钌催化剂氨合成 2.钌是众所周知的呈现出显着的活动，氨合成，特别是在推动与碱金属的化合物，一些表现出更大的活动比铁催化剂常压下（ 1 ， 2 ）。事实上，钌催化剂可被视为第二代合成氨催化剂权利与铁催化剂。目前，一种钌催化剂已用于商业合成氨厂（ 3 ），证明其潜在的应用前景的产业。 3.Z后，我们发现，稀土氧化物（氧化铈， Sm2O3 ，氧化镧）是Z有效的支持氨合成。此外，大量增加的活动，观察减少在高温下。其中稀土氧化物， Ru/Sm2O3和Ru/La2O3被认为是更积极的，而只有Ru/CeO2保持稳定的活动，在很长一段时间。我们进一步的研究将侧重于氢中毒的作用发挥这些系统中。

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awardui 2009-06-05 00:00:00

呵呵这是我朋友翻译的 ... 你看看吧.. 1. 注意镧系元素氧化物的作用作为支持在氨综合的钌催化剂 2.钌比铁催化剂知道显示氨综合的重大活动，特别当促进与碱性金属的化合物，一些陈列更加巨大的活动在大气压(1， 2)下。实际上，钌催化剂也许认为第二代氨催化剂沿着铁催化剂。目前，钌催化剂的类型用于一棵商业氨植物(3)已经，证明它的潜力为在产业的有为的应用。 3.总而言之，我们发现镧系元素氧化物(CeO2、 Sm2O3， La2O3)是Z有效的支持氨综合。此外，在活动的显著地增加由减少观察在高温。在镧系元素氧化物之中，当仅Ru/CeO2长期以来维护了稳定的活动时间时，发现Ru/Sm2O3和Ru/La2O3更加活跃的。我们的进一步研究将集中于使用在这些系统的角色氢毒化。

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捕依仕推 2009-06-05 00:00:00

1. 注意镧系元素氧化物的作用作为支持在氨综合的钌催化剂 2.钌比铁催化剂知道显示氨综合的重大活动，特别当促进与碱性金属的化合物，一些陈列更加巨大的活动在大气压(1， 2)下。实际上，钌催化剂也许认为第二代氨催化剂沿着铁催化剂。目前，钌催化剂的类型用于一棵商业氨植物(3)已经，证明它的潜力为在产业的有为的应用。 3.总而言之，我们发现镧系元素氧化物(CeO2、Sm2O3， La2O3)是Z有效的支持氨综合。此外，在活动的显著地增加由减少观察在高温。在镧系元素氧化物之中，当仅Ru/CeO2长期以来维护了稳定的活动时间时，发现Ru/Sm2O3和Ru/La2O3更加活跃的。我们的进一步研究将集中于使用在这些系统的角色氢毒化。

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高分求翻译在线等有点长请耐心点，我可以追加分阶段大侠帮忙: 1. NOTE The Effect of Lanthanide Oxides as a Support for Ruthenium Catalysts in Ammonia Synthesis 2. Ruthenium is known to show significant activity for ammonia synthesis， particularly when promoted with alkali metal compounds， some showin... 1. NOTE The Effect of Lanthanide Oxides as a Support for Ruthenium Catalysts in Ammonia Synthesis 2. Ruthenium is known to show significant activity for ammonia synthesis， particularly when promoted with alkali metal compounds， some showing greater activity than iron catalysts under atmospheric pressure (1， 2). In fact， ruthenium catalysts may be regarded as second-generation ammonia catalysts right alongside iron catalysts. Currently， a type of ruthenium catalyst is already being used in a commercial ammonia plant (3)， proving its potential for promising applications in industry. 3. In conclusion， we found that lanthanide oxides (CeO2， Sm2O3， La2O3) were the most effective supports for ammonia synthesis. Furthermore， a significant increase in activity was observed by reduction at high temperatures. Among lanthanide oxides， Ru/Sm2O3 and Ru/La2O3 were found to be more active while only Ru/CeO2 maintained stable activity for a long period of time. Our further studies will focus on the role hydrogen poisoning playing in these systems. 展开

高分求人工翻译一段话好的话再追加在线翻译者谢绝入内: 本文主要实现了基于LABVIEW的数字随动系统的网络实验开发，在LABVIEW软件环境下编写数字随动系统PID控制器的程序，运用LABVIEW平台的强大扩展功能将此套实验系统发布到网络之上，并设... 本文主要实现了基于LABVIEW的数字随动系统的网络实验开发，在LABVIEW软件环境下编写数字随动系统PID控制器的程序，运用LABVIEW平台的强大扩展功能将此套实验系统发布到网络之上，并设定相应的控制使用权限和安全保护功能，首先，本文运用C语言，自动控制原理等相关知识，使用图形化编辑语言G语言在LABVIEW平台上编写框图形式的PID控制程序，并制作相应的程序前面板，使数字随动系统的控制过程操作更简便，原理更直观；在之后LABVIEW网络通讯功能的设计中，选择利用前面板发布技术这种Z为简单易行的途径实现虚拟仪器的远程发布和控制，又使用了LABVIEW WEB服务中的API密匙来设置远程客户端访问和控制的权限，保证了数字随动系统虚拟仪器远程实验的安全要求。在各部分设计过程的介绍中，还列举了其他很多方法，都将各种可行方案的优缺点进行了评述和对比，并选出Z优的设计方案加以实现。展开

高分请高手帮忙翻译英文文献资料（4）: Whenliquidisheateditevaporates.Theevaporationprocessisdependentonpressure，temperatureandcompositionoftheliquidandgas.Gascanalsocondense.Inadditionthereisaconvectiveheattr... When liquid is heated it evaporates. The evaporation process is dependent on pressure， temperature and composition of the liquid and gas. Gas can also condense. In addition there is a convective heat transfer between the liquid and gas zone that must be considered. The surfaces in the gas zone also radiates from the shell to the liquid. During the blowdown process mass is usually evacuated from the gas zone， but also liquid might be released. The rate of release is dependent on density and pressure as well as the release area. As pressure and temperature change， the properties of all materials change. This has to be considered in a prediction of a blowdown process. The main purpose of a blowdown process is as earlier stated to maintain integrity of the equipment. The strength properties of the shell are the key factor on that matter. The strength is dependent on the inside pressure as well as the support forces. If the exposing forces produce stress that exceeds the ultimate tensile stress (UTS) in some regions， the integrity of the equipment is no longer maintained. In the design phase of a process plant， these aspects are crucial and must be included as a dimensional factor. For that reason prediction of the blowdown process is essential. Lately some new standards has been introduced to the industry on this matter [3] and [4]. VessFire [1] and [2] is a multi physics system designed for calculation of this kind of problems. It has been applied for some time in the oil and process industry on many projects. The system satisfies the requirements for predictions outlined in [3] and [4]. It includes all aspects described above including integrity of the shell. As part of the verification process some experiments where performed. Some of the experiments are presented here. EXPERIMENTAL STUDY The purpose of the experiments was to investigate the evaporation process and the heat transfer to the liquid and vapour. In a complex system it is important to reduce unknown parameters as far as possible. Exposure from a flame is difficult to control. Flux measurements are point values and not necessarily representative for the average exposure. In order to control the heat exposure it was decided to apply an electric heating system. The system and the verification of the system is described in [5]， [6] and [8]. The furnace was built inside a supporting tube. Figure 2 shows a general arrangement of the experimental outfit. A 0.05 mm stainless steel foil formed as a tube， 300 mm in diameter， generated the heat. The power supply was based on a 3-phase alternating current system giving 48 Volt output as maximum. The top exposure had a limit of 300 kW. The foil had a surface of about 1 m2， giving a heat flux up to 300 kW/m2. The power input could be continuously regulated from zero to maximum load. Each experiment was started from zero and brought up to the required load within a few seconds. After that the surface temperature of the heating foil was kept constant during the exposure period. Experiments with both dry objects as well as water filled object were performed. In this paper only water filled experiments are presented Figure 2 General arrangements drawing of the experimental furnace including the specimen and its support Figure 3 Illustration of the heating unit. The black part is copper conductors for the foil. The grey part is the heating foil exposing the specimen. The foil is equipped with thermo-elements all marked H， except H5 which is the temperature in a copper ring and H6 which is the temperature between the insulation and the supporting tube. 展开

急求英语达人帮忙翻译段文章，在线等谢谢: The incorporation of silicon from the quartz-made growth chamber， characteristic of NIRIM-type reactor is insignificant in our samples， if any. The peak at 1.681 eV from the Si–V defect is totally absent from our films (not shown here)， wh... The incorporation of silicon from the quartz-made growth chamber， characteristic of NIRIM-type reactor is insignificant in our samples， if any. The peak at 1.681 eV from the Si–V defect is totally absent from our films (not shown here)， which supports the good quality of these films. The improvement of the crystalline quality of {111} films is explained by the weak ion bombardment of the sample during its growth outside the plasma ball. Raman measurements (not shown in this work) have also confirmed the high crystalline quality of our films， in particular in the low doping range. Very high boron concentrations (up to 5×1021 cm−3) have been reached at this growth position， outside the plasma ball. 展开

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

求个网管软件在线急等！！！采纳追加！！: 以前见过一种就是可以自行冲费会员卡号可以自己填钱可以预存下次上机直接输入卡号和密码就能上机的那种软件忘了叫什么名字了有类似的软件也行谢谢我朋友网吧就10～15台电脑就像控制收... 以前见过一种就是可以自行冲费会员卡号可以自己填钱可以预存下次上机直接输入卡号和密码就能上机的那种软件忘了叫什么名字了有类似的软件也行谢谢我朋友网吧就10～15台电脑就像控制收费不用刷卡的那种软件就好展开

成绩单翻译在线等: 生物工艺实验1《分子生物学》课程论文《生物工艺学》教学实习基因工程原理生物工艺学1《微生物遗传学》课程论文生物工程综合教学实习生物工艺实验2生物反应器生物工艺学2生物工程综合... 生物工艺实验1 《分子生物学》课程论文《生物工艺学》教学实习基因工程原理生物工艺学1 《微生物遗传学》课程论文生物工程综合教学实习生物工艺实验2 生物反应器生物工艺学2 生物工程综合专业实践《生物反应器》课程设计生物工程实习模块2 展开

急求翻译请帮忙翻译一下这篇英文资料，急用！！！！: Wells-BrookfieldCone/PlateRapidDeterminationOfAbsoluteViscosityIntroductionTheWells-BrookfieldCone/PlateViscometergivesresearchersasophisticatedinstrumentforroutinelydete... Wells-Brookfield Cone/Plate Rapid Determination Of Absolute Viscosity Introduction The Wells-Brookfield Cone/Plate Viscometer gives researchers a sophisticated instrument for routinely determining absolute viscosity of fluids in small sample volumes. Its cone and plate geometry provides the precision necessary for development of complete rheological data. Principle of Operation The Wells-Brookfield Cone/Plate Viscometer is a precise torque meter which is driven at discrete rotational speeds. The torque measuring system， which consists of a calibrated beryllium-copper spring connecting the drive mechanism to a rotating cone， senses the resistance to rotation caused by the presence of sample fluid between the cone and a stationary flat plate. The resistance to the rotation of the cone produces a torque that is proportional to the shear stress in the fluid. The amount of torque is indicated either on a dial or digital display， depending on model. This reading is easily converted to absolute centipoise units (mPa.s) from pre-calculated range charts. Alternatively， viscosity can be calculated from the known geometric constants of the cone， the rate of rotation， and the stress related torque. See Range Tables The correct relative position of cone and plate is obtained by following a simple mechanical procedure without the need for external gauges or supplementary instrumentation. The stationary plate forms the bottom of a sample cup which can be removed， filled with .5 ml to 2.0 ml of sample fluid (depending on cone in use)， and remounted without disturbing the calibration. The sample cup is jacketed and has tube fittings for connection to a constant temperature circulating bath. The system is accurate to within ?.0% of the working range. Reproducibility is to within ?.2%. Working temperature range is from 0oC to 100oC. 展开

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

请帮忙翻译一下，拜托: A new kind of TiO2 nanotube array/Ni(OH)2 (TiO2/Ni(OH)2) composite electrode with the storage ability of light energy was prepared by the deposition of Ni(OH)2 on the TiO2 nanotube array， which was synthesized by anodizing Ti foils in an HF... A new kind of TiO2 nanotube array/Ni(OH)2 (TiO2/Ni(OH)2) composite electrode with the storage ability of light energy was prepared by the deposition of Ni(OH)2 on the TiO2 nanotube array， which was synthesized by anodizing Ti foils in an HF aqueous solution. SEM and XRD results showed that Ni(OH)2 particles were well distributed on high density， well-ordered and uniform TiO2 nanotube arrays. The photoelectrochemical properties of the TiO2/Ni(OH)2 electrode were investigated in NaHCO3/NaOH buffer solution (pH 10) by means of UV–vis absorption spectra， cyclic voltammogram (CV) and photocurrent measurements. It was found that the TiO2/Ni(OH)2 electrode was highly sensitive to light and exhibited excellent photoelectrochromic properties. Upon UV irradiation， the photogenerated holes by TiO2 nanotube arrays can oxidize Ni(OH)2 to NiOOH， and thus the TiO2/Ni(OH)2 electrode can be photo-charged by light。1. Introduction Among many visible light photocatalysts， TiO2nanostructures have attracted much attention due to high photocatalytic activ-ity， nontoxicity， chemical stability and huge potential applications [1–6]. The TiO2 nanotube array is one of most attention-getting TiO2nanostructures because of large surface area and outstanding charge transport properties. TiO2nanotube arrays can be utilized in dye-sensitized solar cells[7–9]， photocatalysis and hydrogen gas sensing [10]. So far， a variety of methods have been attempted to prepare TiO2 nanotube arrays， such as hydrothermal synthe-sis[11]， Langmuir–Blodgett technique [12]， solution casting [13] and anodization technique[10，14]， etc. Among these methods， the anodization technique has many advantages of low cost， low tem-perature and easy to be scaled up to large-area preparation. Recently， anewkindof photo-functional systemwith theenergy storage ability has been developed by coupling TiO2 photosen-sitive electrode with energy storage materials. In Takahashi and Tatsuma’swork[15]，aTiO2/Ni(OH)2bilayer thinfilmwas suggested for the oxidative energy storage. In this case， a redox-activep-type semiconductor Ni(OH)2is coupled withn-type TiO2photocatalyst to formap–njunction，WhenTiO2is illuminatedby light， holesgen-erated at the junction are separated from excited electrons， trans-ported into the bulk of Ni(OH)2and oxidized Ni(OH)2to NiOOH. Therefore， the oxidative energy storage system was constructed 展开

求无损检测视频教程射线优先高分求有追加: 求无损检测视频教程射线优先高分求有追加考试要用急求有检验员视频教程更佳... 求无损检测视频教程射线优先高分求有追加考试要用急求有检验员视频教程更佳展开

挤出机英语翻译。。。在线等。高分悬赏: 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. 展开

高分求光学薄膜物理专业英语翻译有追加: 翻译论文摘要给出了部分关键词希望对你您有所帮助也希望您对我有所帮助呵呵部分关键字：带通滤光片近红外膜系设计短波通 ZX波长透射率 key words :pass-band optical filter； near infrared; film system design;short wave pass；centr... 翻译论文摘要给出了部分关键词希望对你您有所帮助也希望您对我有所帮助呵呵部分关键字：带通滤光片近红外膜系设计短波通 ZX波长透射率 key words :pass-band optical filter； near infrared; film system design;short wave pass；central wavelength ；transmittance 翻译正文如下：摘要：随着矿难的频频发生，瓦斯探测器的灵敏度越来越受到人们重视。本文中的红外吸收型甲烷检测仪便具有选择性强，灵敏度高等优点。其中近红外滤光片为该装置的核心部件。本文介绍了利用特征矩阵法进行薄膜设计的制作方法。采用Si和SiO2作为薄膜材料，利用ZX波长不同的长波通和短波通滤光片对接，以完成近红外波段的带通滤光片设计。该滤光片ZX波长为1651nm，并在该波长附近的透射率可达到95%。能翻多少翻多少一句也行呀呵呵 google的就免了，翻得好有追加，人格担保~~ 展开

请各位大虾帮忙翻译一下：: Withmorethan6millionnewmeasurementchannelssoldlastyear，NationalInstrumentsisaworldwideleaderinvirtualinstrumentation.Engineershaveusedvirtualinstrumentationformorethan25y... With more than 6 million new measurement channels sold last year， National Instruments is a worldwide leader in virtual instrumentation. Engineers have used virtual instrumentation for more than 25 years to bring the power of flexible software and PC technology to test， control， and design applications making accurate analog and digital measurements from DC to 2.7 GHz. This document provides an excellent introduction to virtual instrumentation as well as additional resources for continued research. What is virtual instrumentation? With virtual instrumentation， software based on user requirements defines general-purpose measurement and control hardware functionality. Virtual instrumentation combines mainstream commercial technologies， such as the PC， with flexible software and a wide variety of measurement and control hardware， so engineers and scientists can create user-defined systems that meet their exact application needs. With virtual instrumentation， engineers and scientists reduce development time， design higher quality products， and lower their design costs. 展开

请高手帮忙翻译一下 3: 2.2.1. Physical and physicochemical characterization The particle size distribution of the Ch-zeolite was determined using a laser diffraction equipment (CILASk 1064) and standard wet sieving (Mesh Tylerk series). Scanning electron mic... 2.2.1. Physical and physicochemical characterization The particle size distribution of the Ch-zeolite was determined using a laser diffraction equipment (CILASk 1064) and standard wet sieving (Mesh Tylerk series). Scanning electron microscopy (SEM-PHILIPSk XL20) was used for photomicrographs as well as to analyse the Ch-zeolite composition (Energy Dispersion X-ray， EDX). The sample was initially placed in a vacuum chamber for coating with a thin layer (few nanometers) of gold (Au). The specific surface area of the material was measured by the methylene blue technique and by nitrogen gas adsorption methods， with the latter also providing information about particle porosity. In the methylene blue adsorption method， aqueous solutions (50 ml) of methylene blue (100 mg l 1) were agitated using an orbital shaker (Marconik) for an hour at room temperature in the presence of different quantities of the Ch-zeolite (0.05–0.3 g). The suspensions were then allowed to settle for 23 h and the resulting supernatants were centrifuged at 5000 rpm before the analysis of the residual methylene blue concentration. Results obtained correspond to averaged values of three different experiments. The specific surface area was evaluated by the Langmuir model， assuming the formation， at high concentrations， of a dye monolayer and 1.08 nm2 molecule 1， for the cross-sectional area (Van den Hul and Lyklema， 1968). The Ch-zeolite specific surface area was evaluated by the nitrogen gas adsorption method， using automated equipment (Autosorb 1-Quantachrome Instrumentsk)， employing multipoint BET isotherm adsorption data fitting. Also from these data， the porosity of the material was evaluated through parameters such as volume of total pores (d < 206 nm)， surface area and volume of micropores (d < 2 nm; Micropore Analysis Method). Zeta potential measurements for the natural and ammonia loaded zeolite， as a function of medium pH， were determined using a Zeta Plusk equipment (Brookhaven Instruments). Suspensions (0.01% v/v) of the Ch-zeolite， previously sieved below 37 Am (400 Mesh Tylerk)， in a 10 3 mol l 1 solution of KNO3 were used and the medium pH was controlled with the addition of HNO3 (pH< 7) and KOH (pH>7)， separately. For the Ch-zeolite saturated with ammonia， suspensions of the material were prepared by the same procedure， except that the sample was loaded with 100 mg NH3–N l 1 of ammonia. 展开

请专家帮忙翻译一下，谢谢！: 粒度检测方法与优缺点比较粉末粒度分布的测量方法经过百余年的发展，据统计至少已经发展了上百种，但随着科技的发展，有些方法被逐步淘汰，有些方法得到了改进和发展（如激光散射法、动态光散射等），并在生产、科研中得到了广泛的应用，现在普遍使用的测量... 粒度检测方法与优缺点比较粉末粒度分布的测量方法经过百余年的发展，据统计至少已经发展了上百种，但随着科技的发展，有些方法被逐步淘汰，有些方法得到了改进和发展（如激光散射法、动态光散射等），并在生产、科研中得到了广泛的应用，现在普遍使用的测量方法有筛分法、显微图像法、光透沉降法、激光散射（衍射）法等几种，下面简单介绍几种常用的粒度测量方法。 ▲ 筛分法是一种具有很长历史的粒度测定方法，筛分法粒度测量是利用一组筛孔大小不同的标准筛将粉末进行筛分，然后对每个筛上样品分别进行称重，进而得到以质量为量纲的粒度分布数据，并可由分布结果计算出如Dv50等其它参数。筛分滶要特点是测量成本低廉，操作简单，但存在着如重复性差，测量时间较长，不能对5um以下的颗粒进行测量等缺点。 ▲显微图像分析法利用光学或电子显微镜及计算机图像识别技术对颗粒粒度及粒度分布，颗粒形貌进行测量，分析的方法。这种方法不仅能够测量粒度分布而且能够直接观察到颗粒的形状，是目前唯yi的一种可目视的直观测试方法，这种特点也是其它粒度测量仪器所不具备。这种方法的优点是直观、简便、费用低，缺点是由于取样量很少，为使测量结果代表性，必须增加待测颗粒的个数（一般认为测量颗粒的个数应在1000个以上），这就相应啬了测量时间，及测试人员的工作强度，但由于能够对颗粒形貌（如长径比等）进行测量，目前也有广泛应用。 ▲光透沉降法沉降法粒度测试的理论基础是斯托克司定律和比尔定律。前者给出颗粒沉降速度与粒径的关系，后者阐明光透过率与粒径重量的关系。可简单的描述为：在沉降液中，有若干相同比重的颗粒，如果同一时刻，从同一位置开始下降，则不同直径的颗粒到达测量区的时间是不同的，根据颗粒到达测量区的时间，及光强的强弱，就可以计算出颗粒的粒径，及相应粒径的颗粒在颗粒群中占有的比例。采用此种原理的测量仪器有比较长的使用历史，但随着科技的发展和测量手段的进步，此方法的缺点也日益突出，如测量时间长，重复性误差大等。 ▲ 激光散射法颗粒测量仪器是以富朗和菲衍射（Fraunhofer diffraction）和米氏散射（Mie scattering）为理论基础。此理论可以简单理解为沿直线传播的平行激光束，在传播过程中遇到颗粒的遮挡后，传播方向发生了改变（即发生了衍射和散射现象），并且大颗粒使激光改变的角度小，小颗粒改变大。（实际上是由于颗粒的遮挡在无限远处形成了一个爱里斑，爱里斑87%的能量集中在ZX亮环，且颗粒直径越大，ZX环越小，颗粒直径越小ZX亮环越大）。如果能在不同角度上接收光能，对于相应的的角度，其光能是对应直径的颗粒集合发生衍射（散射）造成的，相应其他角度上光能的强弱也就反应了对应直径颗粒在整个颗粒集合中占有的比例。 ▲ 采用激光粒度测量仪器相对于光透沉降粒度测量仪器具有很多优点： 1. 原理先进，并且由于测试过程中没有需要预先设定的参数（如样品比重、介质黏度、环境温度等），及在测量过程中随时改变的条件，因此测量结果准确、可靠。 2. 测量速度快，测试时间与样品粒度分布无关，典型测试过程一般小于一分钟； 3. 每次测试，多次对样品进行扫描，测试结果重复性好； 4. 进样方式种类多，可适用于各种类样品。展开

加速度传感器输出（急，在线等，给高分）: 远东测振（原北京测振仪器厂）的YDI-37内装电路加速度计的输出有人了解吗？网址是这个：http://www.vmif.com/product7.html 与技术支持交流得到的是：输出为交流电压信号，正负5V范围。关键是不理解这个交流电压信号输出，以前用到的都是直流输出的。请知情... 远东测振（原北京测振仪器厂）的YDI-37内装电路加速度计的输出有人了解吗？网址是这个：http://www.vmif.com/product7.html 与技术支持交流得到的是：输出为交流电压信号，正负5V范围。关键是不理解这个交流电压信号输出，以前用到的都是直流输出的。请知情人帮忙解答一下。谢谢了。在线等！展开

请帮忙分析下是什么问题~主板？电源？在线等，谢谢~~~: 昨晚用电脑正看电影，突然就黑屏了，机箱的声音也和正常运转时不太一样，长按电源键关机再重启后，就一直黑屏，但还有进入系统的声音（64位win7），再重启后，还是一直黑屏，但再也没有进入系统的声音了去装电脑的店里检修，老板说是显卡坏了，要返厂修，给... 昨晚用电脑正看电影，突然就黑屏了，机箱的声音也和正常运转时不太一样，长按电源键关机再重启后，就一直黑屏，但还有进入系统的声音（64位win7），再重启后，还是一直黑屏，但再也没有进入系统的声音了去装电脑的店里检修，老板说是显卡坏了，要返厂修，给我临时借了一块（用这个显卡能正常开机和显示了），就这样抱着机子回家，再开机发现集成的网卡怎么也找不到了（可能刚才在店里也没注意到），所以上不了网，但至少还可以看下载好的电影，又是看了1小时左右，突然又黑屏，重启也是黑屏，且没有进入系统的声音，只是机箱在工作，透过半透明的侧盖也能看到各部风扇都在转动着，可显示器没反应，好像没开机一样。而且，这次长按关机键不能关机了，变为短暂关机后马上重启，只有拔掉电源线才可关机。。。请教各位，这到底是什么部件出了问题，主板？电源？对了，之前我那块显卡是需要电源的，而电脑老板借我的显卡不需要电源。展开