Reflections on China's Institutional Reform on Urban Planning Decision-making:A Case Study on Shenzhen Urban Planning Committee

With the establishment of a market economy, the deepening of market-oriented reforms, and an increased awareness of rights protection, the role of government as sole investor and manager of urban construction projects     

电磁兼容抗干扰测试仪器的校准

电磁兼容抗干扰测试仪器是电磁兼容测试中重要的一类测试仪器,但对于这些仪器的校准测试仍然没有国家计量检定规程或校准规范.本文对上述仪器的校准方法和校准仪器进行了介绍.     

单片数字集成电路开发成本的数学模型

本文给出了集成电路工艺流片、测试、封装成本的数学模型,并用设计成本量化模型计算了三种数字集成电路的成本,计算结果与实际结果吻合良好。     

氧离子束辅助激光淀积生长ZnO/Si的研究

利用X射线衍射(XRD),X射线摇摆曲线(XRC)和X射线光电子能谱(XPS)分析方法对氧离子束辅助激光淀积生长的ZnO/Si异质结薄膜进行了分析.结果表明:用该法可生长出高度c轴单一取向ZnO薄膜,XRC的半高宽度(FWHM)仅为2.918°.表明此生长方法经优化,可生长出单晶质量很好的ZnO/Si薄膜.     

Cell culture imaging using microimpedance tomography

We present a novel, inexpensive, and fast microimpedance tomography system for two-dimensional imaging of cell and tissue cultures. The system is based on four-electrode measurements using 16 planar microelectrodes (5 microm x 4 mm) integrated into a culture chamber. An Agilent 4294A impedance analyzer combined with a front-end amplifier is used for the impedance measurements. Two-dimensional images are obtained using a reconstruction algorithm. This system is capable of accurately resolving the shape and position of a human hair, yielding vertical cross sections of the object. Human epithelial stem cells (YF 29) are also grown directly on the device surface. Tissue growth can be followed over several days. A rapid resistivity decrease caused by permeabilized cell membranes is also monitored, suggesting that this technique can be used in electroporation studies.     

Catechin stability of EGC- and EGCG-enriched tea drinks produced by a two-step extraction procedure

Catechin content of green tea drinks commercially available is reported to be very low in comparison with tea traditionally prepared, due to catechins conversion to their corresponding epimers during production. The purpose of this present study was to produce catechin-enriched tea drinks according to a two-step brewing procedure and to verify the catechin stability of those enriched drinks during storage. Those results confirmed that it is possible to produce EGC- and EGCG-enriched tea drinks regardless of the green tea used. Good extraction efficiencies were reached for the first and second extraction steps with catechin extraction yields ranging from 63.6% to 84.8%. Furthermore, it appeared that the catechin content in the two enriched tea drinks demonstrated a great stability since no significant degradation occurred within 8 weeks of storage. This simple two-step extraction procedure could be considered as an interesting way to produce enriched green tea drinks with more potent and stable bioactive catechins.     

Mesoscale pore structure of a high-performance concrete by coupling focused ion beam/scanning electron microscopy and small angle X-ray scattering

This contribution couples (a) Small angle X-ray scattering (SAXS) experiments of a high-performance concrete (HPC) at the millimetric scale, and (b) Focused ion beam/scanning electron microscopy (FIB/SEM) of the cement paste of the HPC, with 10-20 nm voxel size. The aim is to improve the understanding of the 3D pore network of the HPC at the mesoscale (tens of nm), which is relevant for fluid transport. The mature HPC is an industrial concrete, based on pure Portland CEMI cement, and planned for use as structural elements for deep underground nuclear waste storage. Small angle X-ray scattering patterns are computed from the 3D pore images given by FIB/SEM (volumes of 61-118 μm³). They are positively correlated with SAXS measurements (volumes of 5 mm³). Aside from correlations with FIB/SEM data, experimental SAXS allows to investigate a wider range of effects on the pore structure. These are mainly the HPC drying state, the presence of aggregates (by analyzing data on cement paste alone), and the use of Poly Methyl MethAcrylate resin impregnation.     

Erhöhung der Energieeffizienz der Crossflow‐Filtration durch keramische Rohrmembranen einer neuen Generation

The effect of cross‐flow filtration of liquids relies on the continuous and controlled circulation of fluids in linear channels. The flow rate is of crucial importance to the economy of the process. TAMI Industries is investigating the use of so‐called additive processes to produce ceramic supports with geometric structures that cannot be produced using traditional technologies. In comparison to conventional geometries, it is possible to increase the permeate output without increasing the energy consumption or correspondingly reducing the energy consumption at the same permeate output.