特拉匹伟

Tea is one of the most widely consumed beverages in the world, and is produced from the tea plant Camellia sinensis. Depending on the processing methods of the leaves of Camellia sinensis after harvesting, green, oolong, or black tea is obtained. This Application Note shows the comprehensive 2D-LC analysis of purine alkaloids and catechins in green and black tea using the Agilent 1290 Infi nity II 2D-LC solution. The precision of retention time and peak volume is determined, and the purine alkaloids caffeine and theobromine as well as the catechins catechin, epicatechin, and epigallocatechin gallate contained in green and black tea are quantified.

赛默飞世尔科技双三元液相色谱系统，双三元系统是UltiMate® 3000系列色谱的卓越组合，通过共享自动进样器、柱温箱、软件实现两套分析系统的功能。 无论是常规分析、微量分析或纳升级分析，双三元系统均能提供完美的解决方案。 UltiMate® 3000系列色谱仪凭借其卓越的性能、创新的理念、丰富的配置， 在2006年匹兹堡展会上荣获IBO金奖赛默飞双三元液相色谱-环境水中阿特拉津

Tomographic PIV as a full volume 3D-3C flow field measurement technique can also be appliedto thin sheets used in standard PIV. Tomographic PIV and Stereo PIV are compared with experimental datafrom an impinging jet in water. The field of view is 60 mm x 40 mm, the light sheet thickness is varied from8 to 55 pixel. Images have been recorded with 4 cameras to gain results from two independent Stereo PIVsystems and from Tomographic PIV using 2-4 cameras. Different error sources for both techniques arequantified. It is shown that instantaneous flow fields from Tomographic PIV deviate less from each of thetwo stereo systems, than the two stereo systems deviate from each other. A systematic error pattern isidentified for the two stereo systems, which is not present for Tomographic PIV. Thin volume TomographicPIV allows the calculation of multiple vector planes. Two planes can be calculated even for the thinnest lightsheet (8 pixel) providing the full 3x3 strain-tensor. Thicker sheets with up to twelve vector planes allow thevisualization of the small vortex structures in this experiment.

2021年 10 月，厦门大学化学与化工学院任斌教授课题组在 Anal.Chem. 上发表题为《Collaborative Low-Rank Matrix Approximation-Assisted Fast Hyperspectral Raman Imaging and Tip-Enhanced Raman Spectroscopic Imaging》的论文，开发了协同低秩矩阵逼近(CLRMA)算法，加快高光谱拉曼成像(HRI)和针尖增强拉曼技术（TERS）成像速度。

Thanks to confocal Raman spectroscopy we have been able to investigate in vivo the epidermis chemical composition in its thickness. In depth measurements allowed us to observe modifications of the relative concentration of some components (water, proteins) depending on the depth in the skin and on its state of hydration.The use of larger numerical aperture objectives would be helpful to emphasize the in-depth variations because of the possible gain in axial resolution and therefore in-depth discrimination. Indeed, the operator could then probe in depth with a smaller step size.As a possible gain on the above measurements, the use of more powerful commercially available NIR diode lasers would yield up to ten times more laser power at the sample (60-80 mW) and would result in a tremendous improvement in terms of signal collection and integration time.?

采用LC1620A液相色谱和C18柱，在波长254nm处测定水中阿特拉津分离效果和测定结果良好，测定的重复性和线性都满足HJ 587-2010的要求。

The quantification of a panel of antiepileptic drugs in human plasma has been implemented and analytically validated on a TSQ Quantum Access MAX mass spectrometer using the MassTox TDM Series A kit for antiepileptics from Chromsystems. The TSQ Quantum Access MAX mass spectrometer proved to have the proper sensitivity, accuracy, and precision for the application of this analytical method to clinical research.

膜曝气-生物膜反应器（MABR）是一种新型的膜-生物废水处理工艺，在MABR中采用基因工程菌生物膜可以强化难降解污染物的生物去除. 本研究在SPG膜表面形成基因工程菌生物膜，运行SPG膜曝气-生物膜反应器（SPG-MABR）处理阿特拉津废水，考察了气压、 挂膜生物量和液体流速对SPG-MABR运行性能的影响，以及基因工程菌生物膜的变化. 结果表明，提高气压可以增大透氧系数，从而提高阿特拉津和COD的去除速率以及复氧速率. 提高挂膜生物量能够加快阿特拉津和COD的生物去除，但生物膜厚度增加使得氧传质阻力增大，复氧速率降低. 层流状态下减小SPG-MABR中的液体流速，有利于污染物向生物膜扩散传质，从而提高污染物去除速率. 气压为300 kPa、 生物量为25 g· m-2、 液体流速为0.05 m· s-1时，SPG-MABR反应器对阿特拉津5 d的去除率可以达到98.6%. 在SPG-MABR运行过程中，基因工程菌生物膜呈现微生物多态化趋势. 生物膜表面逐渐被其他微生物细胞覆盖，基因工程菌分布减少，生物膜内部仍以基因工程菌细胞为主.

The flow of an air curtain mounted above a doorway in which was placed a mannequinwas studied using stereo particle image velocimetry. The study revealed that the interferenceof the air curtain flow was limited to a region near the doorway. The air curtain flow stagnatesaround the top surfaces of the mannequin. A high level of turbulence also existed in thisregion. The turbulence diminished rapidly past the mannequin and increased in a thin regionnear the floor as the flow entered the floor vents

IntroductionThe groundbreaking Symmetry CMOS-based EBSD detector, together with the powerful AZtec® software, is capableof acquiring EBSD and EDS data at speeds in excess of 3000 indexed patterns per second (pps). These speeds, twiceas fast as those achievable with conventional CCD-based detectors, are further enhanced by the fact that extremepixel-binning of the diffraction patterns is not necessary. This means that the quality of the data collected usingSymmetry is significantly better than with CCD-based detectors, both in terms of hit rate and also angular accuracy.In this application note we give examples of how Symmetry can be used to characterise the microstructures in twoexample metals at high speeds, providing reliable statistics in affordable timescales.

采用三台LaVision公司的ImagerProHS高速相机，加上DaVis7.4软件平台，对风洞中的翼型进行了时间分辨层析PIV测量，并用一种新型的高效准确的MTE-MART算法，对结果进了分析处理，并比较了这种算法与其它多种算法的性能。

层析-PIV，Tomo-PIV是德国LaVision公司独有的能够测量获得高分辨率全体积3分量速度矢量场的系统。本篇介绍了先进的运动追踪增强粒子重构算法MTE-MART的原理和应用。采用这种算法，在相同的硬件配置下，可以处理更高浓度的粒子场，得到空间分辨率更高的速度矢量场。

Tea is one of the most widely consumed beverages in the world, and is produced from the tea plant Camellia sinensis. Depending on the processing methods of the leaves of Camellia sinensis after harvesting, green, oolong, or black tea is obtained. This Application Note shows the comprehensive 2D-LC analysis of purine alkaloids and catechins in green and black tea using the Agilent 1290 Infi nity II 2D-LC solution. The precision of retention time and peak volume is determined, and the purine alkaloids caffeine and theobromine as well as the catechins catechin, epicatechin, and epigallocatechin gallate contained in green and black tea are quantified.

通过Lasertec的hybrid共聚焦显微镜对OLED行业遇到的缺陷问题进行有效的测量，如ITO平整度、发光层均匀性等缺陷。

比较空白、原料药及不同API含量样品的拉曼光谱图，发现随含量变化815cm-1处峰强度变化明显。因此选择815cm-1处峰作为该API的定量相关目标峰。

以克拉霉素为模型药物，通过液中干燥法制备克拉霉素-乙基纤维素微球，并用海藻酸钠进行包裹，最后壳聚糖包衣以增强微囊的生物粘附性能，制备出以乙基纤维素为核心材料，海藻酸钠、壳聚糖为包衣材料的克拉霉素-乙基纤维素-海藻酸钠-壳聚糖微囊。考察了影响微囊体外释药的因素及其在大鼠胃粘膜上的粘附性能。结果表明，克拉霉素-乙基纤维素-海藻酸钠-壳聚糖微囊不仅具有显著的缓释效果，且在大鼠胃粘膜上具有良好的粘附性能。

The wakes of wall mounted circular cylinders of very lowaspect ratio have been investigated in a wind tunnel. Besidesplanar PIV, also high resolution tomographic PIV was usedto capture the flow phenomena downstream of the cylinder.By changing the velocity U￥ and the cylinder height h at aconstant aspect ratio L = h=D, a wide database of differentflow conditions was obtained. The resulting relative height ofthe boundary layer thickness d was 0:6 h=d 2:5, while theReynolds number based on the length l between leading edgeand cylinder centre Rel was 57 000 Rel 188 000. A pair ofcounter-rotating vortices was found in the wake of the cylinder.The rotation sense is such, that in the center of the wake apositive vertical velocity component results. Also horseshoevortices were found next to these trailing vortices. The relativeheight of the incoming boundary layer has a large impact on thedevelopment, strength and dissipation of the vortex system.

徐老师团队主要利用共聚焦拉曼对半导体的两个重要参数进行了分析： 1. EPI 层厚度 ，因为不同的半导体器件对于外延EPI 层厚度的要求并不相同，因此，获知 EPI 厚度并对其 进行准确控制 是制备半导体器件的重要一步。 2. 载流子浓度 ，作为一个重要的电学性能参数，研究这一浓度分布情况，也可以帮助优化半导体的加工参数，比如指导离子注入剂量、退火温度和时间等关键加工参数的调控。

采用立陶宛Ekspla公司的SL系列高能皮秒激光器对国际热核聚变实验堆（ITER）计划相关靶材料样品进行了激光诱导击穿光谱学（LIBS）测量和研究。

拉曼光谱技术可以用来获取反映物质组成结构信息的指纹图谱。而表面增强拉曼（SERS）技术可以将通常非常微弱的拉曼信号强度放大到1百万倍以上。 Klarite芯片的独特设计和生产工艺使得它具有优秀的重现性，无论是医学诊断，药物检测 还是刑侦，国土安全等应用，Klarite芯片都可以一展身手。产品特点可重复性 -- 由于采用半导体制造工艺，获得了卓越的测试结果可重复性灵敏度 -- 百万倍的信号增强特异性 -- 保留丰富的固有拉曼信息灵活性 -- 多种样品制备方法应用由于Klarite芯片所具有的高度可重复性。使得它可以被广泛应用于工业和科研应用中。-- 国防和国土安全 （包括生化危险探测）-- 产品认证-- 食品分析-- 制药工业-- 刑侦

1.Gluten composition, gluten quality, and dough-mixing properties of high-yielding wheats derived from crosses between common and synthetic wheats2.Comparing Mixolab® parameters obtained with slow and faster dough-mixing test protocols

The Tomographic-PIV measurement system performances are experimentally assessed within the presentstudy. The technique is applied to the turbulent air flow past circular cylinders in two configurations, namely thethin light sheet and the thick light sheet. In the first case the Tomo-PIV measurements are compared withstereoscopic PIV, which is assumed as a reference result. Image signal conditioning by pre-processing seems to beessential in order to achieve an accurate particle field reconstruction in presence of background light and electronicnoise. The comparison shows that the two techniques are basically equivalent in the thin light sheet configuration.The 3D measurements are performed with the thick light sheet technique where the instantaneous velocity vectordistribution is measured over a domain of 31x26x10 mm3 yielding 28x24x5 velocity vectors. The vortex wake past acircular section cylinder is visualized within the volume snapshots and the time-averaged flow representation showsa consistent flow pattern with respect to the geometric boundary conditions with the separated shear layers alignedalong the cylinder axis.

Along with the rapid growth of research of microfluidics, monitoring and understanding micro flowbehavior is a challenge for researchers. Particle Image Velocimetry (PIV), a powerful tool thatmakes flow visible, was extended to microscale by Santiago et al. 1998. In this paper, we presentedthe micro Particle Image Velocimetry (μ PIV) system at Nanyang Technological University (NTU),its calibration and characterizations of microfluidic devices using μ PIV. Since the fully developedmicrochannel flow has been well investigated, it is suitable to calibrate the measurements of μ PIV.In our experiment, an in-channel microdispenser fabricated on printed circuit board is used to form amicrochannel. A syringe pump forces water that contains fluorescent particles. The flow field is obtainedby μ PIV. At the same time, a three-dimensional model with ANSYS/FLOTRAN was used.The comparison between the two results demonstrates that our μ PIV system works well. Furthermorewe use this system to characterize a Tesla valve - a non-moving part valve. The valve consistsof a fluid channel structure that has rectification property, which favors forward flow while hampersreverse flow. The velocity fields are also validated by ANSYS/FLOTRAN.

Tea is one of the most widely consumed beverages in the world, and is produced from the tea plant Camellia sinensis. Depending on the processing methods of the leaves of Camellia sinensis after harvesting, green, oolong, or black tea is obtained. This Application Note shows the comprehensive 2D-LC analysis of purine alkaloids and catechins in green and black tea using the Agilent 1290 Infi nity II 2D-LC solution. The precision of retention time and peak volume is determined, and the purine alkaloids caffeine and theobromine as well as the catechins catechin, epicatechin, and epigallocatechin gallate contained in green and black tea are quantified.

方法包是赛默飞世尔科技色谱质谱部应用部门针对客户需求提出的简易仪器使用流程，方法包内所涉及的化合物均为常见的能在 GC/MS 上检测的化合物，如农药残留、多环芳烃、多氯联苯、多溴联苯和多溴联苯醚、邻苯二甲酸酯等。方法包的作用就是能使客户更快更简便得使用仪器，尽快上手。方法包包括进样方法，数据处理方法（TraceFinder 方法文件夹），相关应用文章，相关标准，色谱柱信息，前处理方法，数据文件等，客户可以直接调用进样方法和数据处理方法完成阿特拉津等化合物的定性定量分析。

超声作用对渗流带泥沙中阿特拉津消散的影响Sonication Effects on Atrazine Dissipation in Vadose Zone Sediment Slurries使用格哈特Laboshake振荡器120rpm连续振荡10天The slurries were stabilized for 10 days on a Shaker (120 rpm,Laboshake, Gerhardt, Konigswinter, Germany)

In this paper a comparative study is presented to assess the uncertainty of two methods for 3C3D velocimetry in microscopic flows: stereoscopic micro-particle image velocimetry (S-μPIV) and wavefront-deformation, or astigmatism, micro-particle tracking velocimetry (WD-μPTV). First, the main parameters affecting both methods’ measurement uncertainty are identified, described and quantified. Second, the test case of flow over a backward-facing step is analyzed using both methods. For comparison standard 2D-2C μPIV measurements and numerical flow simulations are shown as well. Advantages and disadvantages of both methods are discussed.

建立了饮用水中有机磷及阿特拉津等9种农药的气质联用检测方法；实验结果表明，国产气质联用仪GC-MS3100可以满足此方面的检测要求。

A novel technique to increase the accuracy of multiplicative algebraic reconstructiontechnique (MART) reconstruction from tomographic particle image velocimetry (PIV)recordings at higher seeding density than currently possible is presented. The motion trackingenhancement (MTE) method is based on the combined utilization of images from two or moreexposures to enhance the reconstruction of individual intensity fields. The working principle isfirst introduced qualitatively, and the mathematical background is given that explains how theMART reconstruction can be improved on the basis of an improved first guess object obtainedfrom the combination of non-simultaneous views reduced to the same time instant deformingthe 3D objects by an estimate of the particle motion field. The performances of MTE arequantitatively evaluated by numerical simulation of the imaging, reconstruction and imagecorrelation processes. The cases of two or more exposures obtained from time-resolvedexperiments are considered. The iterative application of MTE appears to significantly improvethe reconstruction quality, first by decreasing the intensity of the ghost images and second, byincreasing the intensity and the reconstruction precision for the actual particles. Based oncomputer simulations, the maximum imaged seeding density that can be dealt with is tripledwith respect to the MART analysis applied to a single exposure.

上海伯东德国 Pfeiffer 热销款皮拉尼真空计 TPR 270 全新升级上市,测量准确,反应迅速,简单好用的优点外，还具有以下升级优点：1）真空计延展测量范围：1,000 -1 to 10-4 hPa2）提高测量精度：± 10 %3）可靠性更高-从2004年上市以来主要应用于大批量 OEM4）皮拉尼真空计优越的热稳定性，更完美的设计外观Pfeiffer 德国普发皮拉尼真空计 TPR 270 与同款真空计 TPR 280 对比，测量范围更广，测量精度更高型号 接口 测量范围 工作温度 测量精度 极限压力 重量 TPR 270 DN 16 ISO-KFDN 16 CF-F 1X10-4 - 1000 hPa 80 °C ± 10 % 400 kPa 135g TPR 280 DN 16 ISO-KFDN 16 CF-R1/8" NPT8 VCR 5X10-4 - 1000 hPa 80 °C ± 15 % 1000 kPa 80g TPR 280 DN 16 ISO-KFDN 16 CF-R 5X10-4 - 1000 hPa 250°C ± 15 % 1000 kPa 130g TPR 281(抗腐蚀系列) DN 16 ISO-KFDN 16 CF-R 5X10-4 - 1000 hPa 80 °C/250°C ± 15 % 1000 kPa 80g Pfeiffer 德国普发皮拉尼真空计 TPR 系列测量范围从1000 hPa 到 5 10-4 hPa,设计紧凑,测量准确,反应迅速,简单好用,适合一般的真空应用, Pfeiffer德国普发皮拉尼真空计TPR 系列多种接口可选.* 全系列真空产品维修保养促销活动:活动期间所有维修保养产品免收检测费,定期做保养服务可有效延长产品使用寿命,减少企业生产成本!上海伯东销售维修德国普发 Pfeiffer全系列产品已有10余年,公司自 1995 年成立以来已累计为数千家客户提供销售维修服务,维修次数累计超过数万余次保证 100 ％ 德国普发 Pfeiffer 原厂维修保养料件和受德国 Pfeiffer 专业培训的工程师,并用 Pfeiffer 原装进口检测设备对维修后的产品做全方面的性能测试,保证维修质量,并在上海,台湾等地区设立维修保养中心.上海伯东凭借其专业的技术背景及良好的服务质量是中国地区多家大型企业和国家研究机构长期合作指定供应商.上海伯东主要经营产品:德国普发Pfeiffer涡轮分子泵,干式真空泵,罗茨真空泵,旋片真空泵:应用于各种条件下的真空计，氦质谱检漏仪，质谱分析仪，以及美国考夫曼公司 KRI 离子源 离子枪 霍尔源，美国HVA真空阀门，Polycold冷冻机等