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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. 展開
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- 新華村社區5930 2007-05-23 00:00:00
- 本人專業對口 --國家儀器公司(或翻譯成國家儀器局)在虛擬儀器技術上世界lingxian,去年它們賣出了超過六十億件的新型測量通道.在長達25年的時間里,工程師們使用虛擬儀器,利用柔性軟件和微機技術的優勢來測試,控制并設計應用程序,使直流下仿真和數字測量的準確度達到了2.7兆赫茲.本文獻詳細的介紹了虛擬儀器以及一些研究進展資料. --什么是虛擬儀器技術? --采用虛擬儀器技術,基于使用者需求的軟件決定了通用化測控硬件的功能.虛擬儀器技術將諸如微機,柔性軟件和多種測控硬件等等聯結到一起,從而工程師和科學家能夠做出能夠滿足他們特定應用需求的系統.虛擬儀器技術使得工程師和科學家們提高了研發效率,設計出更高質低耗的產品.
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- 昕丫0106 2007-05-23 00:00:00
- 與超過6 百萬種新測量渠道去年被賣, 全國儀器是全世界領導在真正儀器工作。工程師使用真正儀器工作超過25 年帶來靈活的軟件和個人計算機技術的力量給測試、控制, 和設計應用做準確模式和數字式測量由DC 對2.7 千兆赫。這個文件提供介紹對真正儀器工作并且另外的資源為持續的研究。什么是真正儀器工作? 以真正儀器工作, 軟件根據用戶要求定義通用測量和控制硬件功能。真正儀器工作與靈活的軟件結合主流商業技術, 譬如個人計算機, 和各種各樣測量和控制硬件, 因此工程師和科學家能創造適應他們確切的應用需要的用戶定義的系統。以真正儀器工作, 工程師和科學家減少研制時間, 設計更加優質的產品, 和降低他們的設計費用。
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- 收鉆姓屏 2007-05-23 00:00:00
- 與多于六百萬新的測量通道去年賣了,國立器具在虛擬的使用儀器中是一位全世界的ling袖。 工程師已經用虛擬的使用儀器超過 25 年帶著有柔性軟件的力量和個人計算機技術到測試,控制, 而且設計發動正確的類比和數傳測量的申請從直流對 2.7個十億赫茲。這一份文件提供對虛擬的使用儀器和另外的資源優良的介紹給繼續的研究。 虛擬的使用儀器是什么? 藉由虛擬的使用儀器,以使用者需求為基礎的軟件定義泛用型的測量和控制硬件功能性。 虛擬的使用儀器聯合像個人計算機這樣的主流商業技術,藉由有柔性的軟件和各式各樣的測量和控制硬件,因此,工程師和科學家能產生會他們的精確申請需要的使用者定義的系統。藉由虛擬的使用儀器,工程師和科學家減少發展時間,設計較高的質量產品, 而且降低他們的設計費用。
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- 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. 展開
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- 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 展開
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- 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. 展開
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- 粒度檢測方法與優缺點比較 粉末粒度分布的測量方法經過百余年的發展,據統計至少已經發展了上百種,但隨著科技的發展,有些方法被逐步淘汰,有些方法得到了改進和發展(如激光散射法、動態光散射等), 并在生產、科研中得到了廣泛的應用,現在普遍使用的測量... 粒度檢測方法與優缺點比較 粉末粒度分布的測量方法經過百余年的發展,據統計至少已經發展了上百種,但隨著科技的發展,有些方法被逐步淘汰,有些方法得到了改進和發展(如激光散射法、動態光散射等), 并在生產、科研中得到了廣泛的應用,現在普遍使用的測量方法有篩分法、顯微圖像法、光透沉降法、激光散射(衍射)法等幾種,下面簡單介紹幾種常用的粒度測量方法。 ▲ 篩分法 是一種具有很長歷史的粒度測定方法,篩分法粒度測量是利用一組篩孔大小不同的標準篩將粉末進行篩分,然后對每個篩上樣品分別進行稱重,進而得到以質量為量綱的粒度分布數據,并可由分布結果計算出如Dv50等其它參數。篩分滶要特點是測量成本低廉,操作簡單,但存在著如重復性差,測量時間較長,不能對5um以下的顆粒進行測量等缺點。 ▲顯微圖像分析法 利用光學或電子顯微鏡及計算機圖像識別技術對顆粒粒度及粒度分布,顆粒形貌進行測量,分析的方法。這種方法不僅能夠測量粒度分布而且能夠直接觀察到顆粒的形狀,是目前唯yi的一種可目視的直觀測試方法,這種特點也是其它粒度測量儀器所不具備。這種方法的優點是直觀、簡便、費用低,缺點是由于取樣量很少,為使測量結果代表性,必須增加待測顆粒的個數(一般認為測量顆粒的個數應在1000個以上),這就相應嗇了測量時間,及測試人員的工作強度,但由于能夠對顆粒形貌(如長徑比等)進行測量,目前也有廣泛應用。 ▲光透沉降法 沉降法粒度測試的理論基礎是斯托克司定律和比爾定律。前者給出顆粒沉降速度與粒徑的關系,后者闡明光透過率與粒徑重量的關系。可簡單的描述為:在沉降液中,有若干相同比重的顆粒,如果同一時刻,從同一位置開始下降,則不同直徑的顆粒到達測量區的時間是不同的,根據顆粒到達測量區的時間,及光強的強弱,就可以計算出顆粒的粒徑,及相應粒徑的顆粒在顆粒群中占有的比例。采用此種原理的測量儀器有比較長的使用歷史,但隨著科技的發展和測量手段的進步,此方法的缺點也日益突出,如測量時間長,重復性誤差大等。 ▲ 激光散射法 顆粒測量儀器是以富朗和菲衍射(Fraunhofer diffraction)和米氏散射(Mie scattering)為理論基礎。此理論可以簡單理解為沿直線傳播的平行激光束,在傳播過程中遇到顆粒的遮擋后,傳播方向發生了改變(即發生了衍射和散射現象),并且大顆粒使激光改變的角度小,小顆粒改變大。(實際上是由于顆粒的遮擋在無限遠處形成了一個愛里斑,愛里斑87%的能量集中在ZX亮環,且顆粒直徑越大,ZX環越小,顆粒直徑越小ZX亮環越大)。如果能在不同角度上接收光能, 對于相應的的角度,其光能是對應直徑的顆粒集合發生衍射(散射)造成的,相應其他角度上光能的強弱也就反應了對應直徑顆粒在整個顆粒集合中占有的比例。 ▲ 采用激光粒度測量儀器相對于光透沉降粒度測量儀器具有很多優點: 1. 原理先進,并且由于測試過程中沒有需要預先設定的參數(如樣品比重、介質黏度、環境溫度等),及在測量過程中隨時改變的條件, 因此測量結果準確、可靠。 2. 測量速度快,測試時間與樣品粒度分布無關,典型測試過程一般小于一分鐘; 3. 每次測試,多次對樣品進行掃描,測試結果重復性好; 4. 進樣方式種類多,可適用于各種類樣品。 展開
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- 急求翻譯 請幫忙翻譯一下這篇英文資料,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. 展開
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- BLD +3 *10.0mg/1 KET +1 * 1.0mmo1/1
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- IFRS13willhelpincreasetransparencywhenentitiesusemodelstomeasurefairvalue,particularlywhenusersneedmoreinformationaboutmeasurementuncertainty,suchaswhenthemarketforanasse... IFRS 13 will help increase transparency when entities use models to measure fair value, particularly when users need more information about measurement uncertainty, such as when the market for an asset or a liability has become less active. IFRS 13 requires entities to disclose information about the valuation techniques and inputs used to measure fair value, as well as information about the uncertainty inherent in fair value measurements (which was of particular concern during the global fi nancial crisis). Some of those disclosures, including the fair value hierarchy, were already introduced in March 2009 through an amendment to IFRS 7 Financial Instruments: Disclosures. Those disclosures have been relocated to IFRS 13. The requirements in IFRS 13 also incorporate the guidance in a FASB Staff Position (FSP) issued in April 2009. 展開
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- 說明一下860DSP是一個信號測量儀器的型號 Here is a good explanation of how the 860 in spectrum mode uses the different settings like dwell wide, narrow, and averaging to look at the spectrum data differently. 860 DSPI Spectrum Analyzer Set... 說明一下860DSP是一個信號測量儀器的型號 Here is a good explanation of how the 860 in spectrum mode uses the different settings like dwell wide, narrow, and averaging to look at the spectrum data differently. 860 DSPI Spectrum Analyzer Settings Explanation In the 860 DSPI there are 3 different and unique spectrum analyzer “Detectors”. These detectors may alter the view of a signals appearance, depending on which is selected. Each detector can show a different picture on the same signal because of the way the detector functions. An important selection to our spectrum analyzer is the amount of digital snap shots to be taken. This will be the amount of digital snapshots that is taken in the allocated bandwidth before showing a picture. With this said, the more sampling that is put into the spectrum analyzer the slower it will seem to update, but more opportunity to capture ingress and other interference that can happen inside a cable plant. Dwell Wide- Dwell Wide takes the largest snapshot out of the amount taken, then the 7.5 MHz spectrum is peak held as the 860 DSPI tunes across the selected frequencies in 250 kHz steps. Example: In Dwell Wide, with a 32 sampling rate set, this in turn means the 860 will dwell or sit on a portion of the spectrum defined above, take 32 snap shots, and then display the picture with the max amplitude before moving on to the next portion of bandwidth. Dwell Narrow- Dwell Narrow takes the largest snapshot out of the amount taken, then a 250 kHz spectrum slice is peak held as the 860 DSPI tunes across the selected frequencies in 250 kHz steps. The difference between Dwell Narrow and Dwell Wide is that Dwell Narrow only peak holds across a 250 kHz slice, where as Dwell wide peak holds the entire 7.5 MHz. Example: In Dwell Narrow, with a 32 sampling rate set, this in turn means the 860 will go to the first 7.5 MHz of the spectrum it will look at a 250 kHz slice of the 7.5 MHz and take its 32 samples. These 32 samples will be done in a peak hold fashion, then display the sample that contains the largest signal. Averaging: This detector when selected looks at a 7.5 MHz portion of the spectrum. When it tunes to the first 7.5 MHz portion of the spectrum, it takes into account how much sampling is selected, then takes it’s digital snapshots on the entire 7.5 MHz, averages those pictures together, then shows the final averaged picture. This detector is used for looking at large amounts of bandwidth. Example: In Averaging, with a 32 sampling rate set, this in turn means the 860 will go to the first 7.5 MHz of the spectrum, take it’s 32 digital snap shots, average those together, and show the average of the 32 snapshots. 展開
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- ThequalitysystemofthecompanyisinconformitywithISO9002.Makingcomprehensiveuseofbiotechnology,thecompanyspecializesinmanufacturingandsellingC-4seriesorganicacidsandchiralpr... The quality system of the company is in conformity with ISO 9002 . Making comprehensive use ofbiotechnology, the company specializes in manufacturing and selling C-4series organic acids and chiral products. These products are widely used in many fields such as food, phamaceutical and chemical industries, and are well accepted by the overseas markets. The man products are L-Malic acid , DL-Malic acid, L(+)-Tartaric acid , Fumaric acid, Maleic acid and other organic acids. Annual productivity amounts to 20,000 tones. The company has become an important manufacturer of C-4 series organic acids in the world . All the products of the company have respectively met the different international aadvanced standards such as Food chemicals Codex, U.S. Pharmacopoeia ,British Pharmacopoeia and the products have obtained Star-K Kosher certificate. Above 70% of the Companys products are exported to Japan, Europe, Australias, the United states and middle East , and they are renown and well recognized in the international markets. The company will devote itself to research and development of enzyme technology and organic electrochemistry. It will continuously introduce new food additives, chiral pharmaceutical intermediates, chiral auxiliaries and chiral drugs. Depending on superior quality, good service and high reputation, the company is willing to establish a long-term mutually beneficial business partnership with overseas customers and continue contribute to the happy life of humans. 展開
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- LabVIEWisapowerfulandcomplexprogrammingenvironment.LabVIEWisshortforLaboratoryVirtualInstrumentEngineeringWorkbench.Itisapowerfulandflexibleinstrumentationandanalysissoft... LabVIEW is a powerful and complex programming environment. LabVIEW is short for Laboratory Virtual Instrument Engineering Workbench. It is a powerful and flexible instrumentation and analysis software development application created by the folks at National Instruments—a company that creates hardware and software products that leverage computer technology to help engineers and scientists take measurements, control processes, and analyze and storem data. National Instruments was founded over twenty-five years ago in Austin, Texas by James Truchard (known as Dr. T), Jeffrey Kodosky, and William Nowlin. At the time, all three men were working on sonar applications for the U.S. Navy at the Applied Research Laboratories at The University of Texas at Austin. Searching for a way to connect test equipment to DEC PDP-11 computers, Dr. T decided to develop an interface bus. He recruited Jeff and Bill to join him in his endeavor, and together they successfully developed LabVIEW and the notion of a “virtual instrument.” In the process they managed to infuse their new company—National Instruments—with an entrepreneurial spirit that still pervades the company today. Engineers and scientists in research, development, production, test, and service industries as diverse as automotive, semiconductor, aerospace, electronics, chemical, telecommunications, and pharmaceutical have used and continue touse LabVIEW to support their work. LabVIEW is a major player in the area of testing and measurements, industrial automation, and data analysis. For example, scientists at NASA’s Jet Propulsion Laboratory used LabVIEW to analyze and display Mars Pathfinder Sojourner rover engineering data, including the position and temperature of the rover, how much power remained in the rover’s battery, and generally to monitor Sojourner’s overall health. LabVIEW provides an extensive library of virtual instruments and functions to help you in your programming. It includes conventional program debugging tools with which you can set breakpoints, single-step through the program, and animate the execution so you can observe the flow of data. 畢業設計急用,望高手幫忙翻譯一下 展開
- 直線位移傳感器(電子尺)如何使用,如何安裝,請各位大蝦指教一下
- 天津工業大學有環境掃描電鏡嗎?列個聯系電話。請各位大蝦幫忙
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- 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. 展開
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- 無機前處理室主要開展食品樣品中無機檢測進儀器前的預處理工作。通過向食品樣品中加入強氧化性酸,采用微波消解技術或電熱板加熱技術使被測無機組分從復雜的樣品中分離出來,除去對分... 無機前處理室主要開展食品樣品中無機檢測進儀器前的預處理工作。通過向食品樣品中加入強氧化性酸,采用微波消解技術或電熱板加熱技術使被測無機組分從復雜的樣品中分離出來,除去對分析測定有干擾的基本物質,制成便于測定的溶液形式。樣品的預處理過程都是在無機前處理室進行的。 主要儀器:ETHOS A微波消解儀、SD500電熱板、Mill-Q Advandage A10超純水儀等。 光譜室主要開展食品、飲用水等樣品中重金屬元素含量檢測工作,各類儀器針對不同的物質進行檢測有其各自的優勢。原子吸收光譜儀耶拿ZEEnie-700系列儀器主要用于鉛、鎘、銅、鉻、錳、鋅、鐵、鈣、鎂、鉀、鈉等項目檢測,雙道原子熒光光度計吉天AFS-820a系列儀器主要用于砷、汞、錫等項目檢測。光譜分析技術已經被廣泛應用于食品和水質檢測、環境保護、醫藥衛生等領域。 主要儀器:原子吸收光譜儀耶拿ZEEnie-700系列、雙道原子熒光光度計AFS-820a系列。 承檢項目:食品、飲用水中重金屬鉛、鎘、銅、鉻、錳、鋅、鐵、鈣、鎂、鉀、鈉、砷、汞、錫等。 要英文的謝謝 展開
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- 請求項2記載の透明硬脆材料のレーザ加工裝置において、前記半透過ミラー及び前記反射ミラーにおける凹面のそれぞれの焦點位置が、同位置となるよう配置したことを特徴とするレーザ加工裝置。
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- 摘要: 目的 生物制品原輔材料踢的生物負載量是藥品生產環境中所污染的微生物來源之一, 本論文對生物制品中經常用到的磷酸氫二鈉、磷酸二氫鈉、聚乙二醇4000、蛋白胨、酵母粉、聚山梨酯80、醋酸鈉7 種原輔材料進行生物負載量研究。方法 采用薄膜過濾法 (尺寸50... 摘要: 目的 生物制品原輔材料踢的生物負載量是藥品生產環境中所污染的微生物來源之一, 本論文對生物制品中經常用到的磷酸氫二鈉、磷酸二氫鈉、聚乙二醇4000、蛋白胨、酵母粉、聚山梨酯80、醋酸鈉7 種原輔材料進行生物負載量研究。方法 采用薄膜過濾法 (尺寸50mm, 孔徑 0145∧m)進行集菌過濾, 分別用玫瑰紅鈉瓊脂培養基, 馬鈴薯葡萄糖瓊脂培養基, 胰酪大豆瓊脂培養基進行培養, 統計出樣品中所含霉菌、酵 母菌、需氧菌的數量。結果 聚山梨酯80、聚乙二醇4000 中未檢出微生物, 負載量極低; 蛋白胨、酵母粉中檢出的微生物含量超過5000 個g, 生物負載量很高; 無機鹽類的醋酸鈉、磷酸二氫鈉、磷酸氫二鈉的負載量比較低, 但是存在污染的方險。結論 在原輔材料的使用過程中, 應注意它們所帶微生物對生產環境的污染, 尤其是蛋白胨、酵母粉等高含菌量原料的污染 關鍵詞: 生物負載量; 原輔材料; 薄膜過濾法 展開
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- 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. 展開
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- Molecularionsatm/z=494.3,496.3,518.3,520.3,522.3,and524.3,indicativeofLPCcontainingC16:1,C16:0,C18:3,C18:2,C18:1,andC18:0fattyacidsatsn-1position,weredetectedC16:1具體指的... Molecular ions at m/z = 494.3, 496.3,518.3, 520.3, 522.3, and 524.3, indicative of LPC containing C16:1, C16:0, C18:3, C18:2, C18:1, and C18:0 fatty acids at sn-1 position, were detected C16:1具體指的是什么呀?是16C,含一個雙鍵嗎??還有sn指的是什么位置呀? 展開
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- 真菌毒素檢測儀應用場景主要檢測糧油谷物及飼料...真菌毒素檢測儀應用場景主要檢測糧油谷物及飼料中真菌毒素含量,包括黃曲霉毒素、玉米赤霉烯酮、嘔吐毒素、伏馬毒素、赭曲霉毒素、T-2毒素等等,檢測樣品涵蓋糧食谷物(大米、玉米、小麥、大麥、高粱等)及其制品、飼料及其原料、食用油脂、牛奶及其制品等;產品適用于地方糧庫、谷物生產企業、飼料廠、各類畜牧養殖企業、面粉廠、食品加工廠、第三方檢測機構及各級監管部門
- 便攜式COD測定儀技術參數檢測項目:COD;...便攜式COD測定儀技術參數檢測項目:COD;檢測量程:10-15000mg/L(分段);檢測方法:水質化學需氧量快速檢測法參考標準:HJ/T399-2007; 比色方式:預制比色試管16mm;比色皿50mm(含)以下;操作系統:安卓智能操作系統;屏幕顯示:8英寸高清觸摸屏,1024*768分辨率;示值誤差:≤±5%;重復性:<0.5%;穩定性:<0.5%;分辨率:0.001;光學穩定性:≤±0.001Abs/20分鐘(10萬小時壽命);自動校準:儀器具有自動校準功能;打印方式:微型熱敏打印機;操作視頻:≥4個項目的操作步驟演示視頻;
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