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- 制备色谱的书都有哪些? 请大家帮忙推荐一下,感谢!
2011-01-19 03:00:20
385
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- 大家帮忙推荐一款3K一下的女性笔记本电脑
- 用途主要是:上网 看电影 偶尔办公一下,当然要性价比高一点的 我看中了一款微星的 下面有参数 朋友们看看还有没有更好的推荐,或者对下面这款 进行一下 评价 微星VR430X QL622G2参数<<返回微星VR430X QL622综述 <<返回查看微星笔记本电脑主要性能 上市... 用途主要是:上网 看电影 偶尔办公一下,当然要性价比高一点的 我看中了一款微星的 下面有参数 朋友们看看还有没有更好的推荐,或者对下面这款 进行一下 评价 微星VR430X QL622G2参数<<返回微星VR430X QL622综述 <<返回查看微星笔记本电脑主要性能 上市时间 2009年03月 网上报价 2999 产品类型 家用 产品定位 日常办公本 处理器系列 AMD 速龙 处理器型号 AMD Athlon 64 X2 QL-62 标称主频 2GHz 前端总线 1800MHz 主板芯片组 AMD RS780+SB700 标配内存容量 2GB 内存类型 DDRII Z大支持内存 4GB 硬盘/光驱 硬盘容量 250GB 硬盘描述 5400转 光驱类型 DVD刻录机 设计类型 光驱内置 光驱描述 支持DVD SuperMulti双层刻录 显卡/音效 显卡类型 集成显卡 显卡芯片 AMD Radeon HD3200 显存/位宽 共享内存容量 显存类型 无 音频系统 内置立体声音效芯片 显示屏 屏幕尺寸 14.1英寸 屏幕比例 16:10 屏幕分辨率 1280×800 背光技术 CCFL背光 尺寸/重量 笔记本重量 2200g 外形尺寸 330×240×25-37mm 机壳材质 复合材质 网络通信 无线网卡 支持802.11b/g/n无线协议 网卡描述 1000Mbps以太网卡 支持蓝牙 无 调制解调器 56K 鼠标/键盘 指取设备 触摸板 接口 USB接口 3×USB2.0 扩展接口 ExpressCard 读卡器 3合一读卡器(MMC/SD/MS) 视频输出 VGA接口 其他接口 RJ45R、J11、耳机/麦克风输出 电源描述 电池类型 6芯锂电池 续航时间 具体时间视使用环境而定 电源适配器 100V/240V 自适应交流电源供应器 其他 操作系统 Windows Vista Home Premium 附带软件 驱动软件 随机附件 电源适配器、软件光盘、说明书 其他性能 集成130万像素摄像头 其他特点 参数纠错du家ACV亮屏炫彩技术,du家ACS智能散热系统,du家ECO节能电源管理系统 展开
2009-11-05 07:22:16
471
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- 帮忙翻译一下,万分感谢
- 说明一下860DSP是一个信号测量仪器的型号 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... 说明一下860DSP是一个信号测量仪器的型号 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. 展开
2010-12-10 08:46:08
525
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- 哪个牌子的试验机比较好?请大家推荐一下
2015-06-01 14:41:56
297
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- 男性尿常规检验报告.请大家帮忙解读分析一下~
- 细菌BACT 结果: 28.70 单位H/ul 参考值 0~11.4 尿比重SG 结果: 1.035 单位H 参考值1.003~1.030 红细胞计数RBC 结果:13.60 单位/ul 参考值0~15 白细胞计数WBC 结果11.80 ... 细菌BACT 结果: 28.70 单位H/ul 参考值 0~11.4 尿比重SG 结果: 1.035 单位H 参考值1.003~1.030 红细胞计数RBC 结果:13.60 单位/ul 参考值0~15 白细胞计数WBC 结果11.80 单位/ul 参考值0~18 上皮细胞EC 结果1.50 单位/ul 参考值0~5.7 管型CAST 结果0.26 单位/ul 参考值:0~2.25 病理管型P.CAST 结果0 单位/ul 参考值0~0.5 结晶数量XTAL 结果0 单位/ul 参考值0~10 小圆上皮细胞SRC 结果1.40 单位/ul 参考值0~3 酵母细胞YLC 结果0 单位/ul 参考值0~10 电导率CONDUCT 结果17.80 单位mS/cn 参考值0~39 粘液丝MUCUS 结果0 尿路感染症UTI 结果:未提示 红细胞信息RBCINF 结果:未提示 颜色U 结果:淡黄 尿糖GLU 结果:正常 尿胆红素BIL 结果:阴性(-) 参考值:阴性 尿酮体KET 结果2+ 参考值:阴性 尿潜血BLD 结果:阴性(-) 参考值:阴性 尿PH值 结果:6.50 参考值:5~9 尿蛋白PRO 结果:2+ 参考值:阴性 尿胆原UBG 结果:1+ 参考值:阴性 尿亚硝酸盐NIT 结果:阴性(-) 参考值:阴性 尿白细胞检查LEU 结果:阴性(-) 参考值:阴性 浑浊度TURB 结果:阴性(-) 管型镜检CAST 结果:未检出 展开
2012-10-28 05:04:53
616
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- 大家能不能推荐一本关于多肽合成的书
2018-03-06 12:24:08
335
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- 组织匀浆机,均质器,高速组织捣碎机--有何不同,大家帮忙推荐一下!
- 做食品,刚成立的实验室,标准上写了这些仪器,不太了解,希望专家能给解释一下,顺便可以给推荐一下仪器型号。不胜感激!!
2010-07-19 01:36:15
666
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- 进口的液氮罐有哪些品牌,帮忙推荐一下?
2012-06-11 15:54:34
358
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- 帕萨特左前速度传感器g47故障怎么解决,请大家帮忙一下
2015-05-31 04:07:54
519
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- 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
2012-11-13 20:08:52
502
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- 请大家帮忙找一款笔记本电脑
- 要求价格4000左右,配置要差不多的,至少能玩游戏上网顺畅的。在线等。
2009-07-10 21:57:57
424
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- 想买一个燃气壁挂采暖热水炉,请大家推荐一下 谢谢。
2012-11-10 01:53:24
345
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- 想买数码相机,请大家帮帮忙推荐!
- 想买个数码相机,女生用,性能好,功能好,外观好,拍的照片好看,还有是拍夜景照要好看,(本人比较爱夜间出动,喜欢看灯火夜景,呵呵);至于相机外观,个人很喜欢索尼的,可是好像... 想买个数码相机,女生用,性能好,功能好,外观好,拍的照片好看,还有是拍夜景照要好看,(本人比较爱夜间出动,喜欢看灯火夜景,呵呵);至于相机外观,个人很喜欢索尼的,可是好像说性能还是佳能的好,所以想请各位数码摄影界的大侠们不吝赐教,推荐一些你们觉得好的适合我的数码相机,价格不限,谢谢各位!!! 补充一下:因为是女生用的,所以不想要太大大笨重,要小巧可爱点的,呵呵。对了,麻烦各位推荐时请说明具体牌子具体型号,谢谢了! 展开
2009-03-05 07:02:25
544
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- 加速度传感器都有哪些品牌,大家都用过哪些牌子的,推荐一个
2012-08-09 13:17:34
665
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- 帮忙推荐几本关于数字图像处理,机器视觉,MATLAB的书
- 我要几本分别关于数字图像处理 机器视觉 MATLAB 的书名 有作者 有出版时间 有出版社名称。 Z好再给一本英文的关于机器视觉的。谢谢你们了~!!
2008-06-07 06:32:33
439
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- 下傅里叶红外光谱仪,请大家推荐一下哪个型号的比较
2018-12-09 03:55:59
325
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- 做桥梁振动监测,需要低频,频带宽的传感器,大家帮忙推荐一下,谢谢!
2012-11-23 12:20:18
392
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- 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
2007-05-22 09:38:51
452
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- 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
2018-11-22 17:49:22
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- #八一建军节——科技铸盾,仪器护航#
- 如何选择到合适的磷青铜绞线?磷青铜绞线的质量...如何选择到合适的磷青铜绞线?磷青铜绞线的质量解析和如何选择到合适的绞线?磷青铜绞线是一种特殊的铜合金导线,由铜、锡和磷等元素组成,具有很好的机械性能、电气性能和耐腐蚀性。磷青铜绞线基本定义与特性:磷青铜是铜与锡、磷的合金,质地坚硬,可制弹簧。典型成分为铜(90%)、锡(6-9%)及磷(0.03-0.6%)锡元素提升合金的强度和耐腐蚀性,磷则细化晶粒、增强耐磨性铸造性能。耐磨性:表面氧化层使其在特殊环境下耐腐蚀,使用寿命长导电性:保持铜很好导电性能的同时有化电子传输路径非铁磁性:不含铁元素,避免在强磁场环境中产生额外能量损耗弹性:受到外力作用时能迅速恢复原状
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