基于模糊评价方法的三全公司社会责任业绩评价

从社会责任视角出发,以三全食品有限公司为研究对象,运用多维度的企业业绩评价指标体系,采用层次分析法和模糊评价法对其业绩进行综合评价。     

Numerical Analysis of the Output-Pulse Shaping Capability of Linear Transformer Drivers

Output-pulse shaping capability of a linear transformer driver (LTD) module under different conditions is studied, by conducting the whole circuit model simulation by using the PSPICE code. Results indicate that a higher impedance profile of the internal transmission line would lead to a wider adjustment range for the output current rise time and a narrower adjustment range for the current peak. The number of cavities in series has a positive effect on the output-pulse shaping capability of LTD. Such an improvement in the output-pulse shaping capability can primarily be ascribed to the increment in the axial electric length of LTD. For a triggering time interval longer than the time taken by a pulse to propagate through the length of one cavity, the output parameters of LTD could be improved significantly. The present insulating capability of gas switches and other elements in the LTD cavities may only tolerate a slightly longer deviation in the triggering time interval. It is feasible for the LTD module to reduce the output current rise time, though it is not useful to improve the peak power effectively.     

Development of Ultra-Low Noise HEMTs for Cryoelectronics at ≤4.2 K

We report on DC and noise characteristics at 4.2 K of High Electron Mobility Transistors (HEMTs) which have been realized at LPN/CNRS. This work is aimed to develop high performance, low-power, low-frequency noise and low-temperature field-effect transistors for the future cryoelectronics. A high quality two-dimensional electron gas (2DEG) based on AlGaAs/GaAs heterostructure has been used to realize appropriately designed HEMTs with different gate configurations. With these transistors, we have obtained, for example, a transconductance of about 100 mS and a voltage gain of 26 with a power dissipation of less than 100 μW at 4.2 K; and a corresponded equivalent input voltage noise of 1.2 nV/Hz^1/2 at 1 kHz and as low as 0.12 nV/Hz^1/2 at 100 kHz.     

直线脉冲变压器技术回顾与展望

直线脉冲变压器是近年来发展最迅速的高功率脉冲驱动源.介绍了快放电直线脉冲变压器的应用前景、工作原理,回顾了直线脉冲变压器的技术发展历程,分析了不同时期的结构特点,阐述了开关、触发系统、磁芯等关键技术研究现状和今后研究重点.最后总结了直线脉冲变压器发展动向及可能涉及的相关技术.     

SINOSTEEL LUOYANG INSTITUTE OF REFRACTORIES RESEARCH CO.,LTD

正Sinosteel Luoyang Institute of Refractories Research Co.,Ltd.(LIRR)is a science and technology enterprise affiliated to Sinosteel Corporation,China.LIRR,established in 1963,is the only large integrated research institute and the center of technology,science,information and services in refractories industry.Its business scope covers refractory products,testing equipment,     

Improvement of 3Y-TZP aging behavior by means of zirconia-based protective layers

In this work 3 mol.% yttria-stabilized zirconia (Y-TZP) disks were pressed and subsequently coated, aiming at producing reliable protective coatings to avoid Low Temperature Degradation (LTD) of Y-TZP. Suspensions of 12Ce-TZP or 5Y-PSZ (5 mol.% yttria stabilized zirconia) powders with different solid contents were used as coatings. Accelerated aging was conducted for times of 2, 6 and 18 hours at 134 °C. Specimens were analyzed using XRD, SEM and Colorimetry. Suspensions with solid content of 23 wt% prepared with 12 mol% ceria stabilized zirconia showed coarsening porosity, while all other suspensions achieved acceptable results for this property. Suspensions with 28 wt% Ce-TZP and 23 wt% Y-PSZ were the selected conditions for the LTD studies. They were selected among the remaining conditions, based on their enhanced color properties and surface density, displaying layers with ∼7 μm and 5-10 μm, respectively. Coatings enhanced resistance to LTD.     

The role of carbon nanotubes on the stability of tetragonal zirconia polycrystals

The effect of single walled carbon nanotubes (SWNT) at zirconia grain boundaries on the stability of a tetragonal zirconia polycrystalline matrix has been explored in as–sintered composites and after low–temperature hydrothermal degradation (LTD) experiments. For this purpose, highly–dense 3?mol% Y₂O₃–doped tetragonal zirconia polycrystalline (3YTZP) ceramics and SWNT/3YTZP composites were prepared by spark plasma sintering (SPS). Quantitative X–ray diffraction analysis and microstructural observations point out that an increasing amount of well–dispersed SWNT bundles surrounding zirconia grains decreases the metastable tetragonal phase retention in the ceramic matrix after sintering. In contrast, the tetragonal ceramic grains in composites with SWNTs are less sensitive to the presence of water, i.e. to undergo a martensitic transformation under LTD conditions, than monolithic 3YTZP ceramics. The SWNT incorporation diminishes micro–cracking due to tetragonal to monoclinic ZrO₂ phase transformation in the composites.     

低温助剂miralan LTD在毛用活性染料中的应用

应用低温助剂miralan LTD和毛用活性染料对羊毛进行低温染色.通过测定在不同温度下染料的上染率、表现得色深度值、皂洗牢度等指标,分析了助剂和毛用活性染料对羊毛染色性能的影响,并探讨了低温助剂miralan LTD的作用机理.实验结果表明,在选用的染料中加入低温助剂miralan LTD之后,染色温度可以降低到80al85℃,上染率有所提高,染色织物的表观色深值和匀染性优于常规染色,皂洗牢度指标达到常规98℃染色水平.     

2.5GW 长脉冲功率模块优化设计与实验研究

为LTD 型重复频率脉冲驱动源研制了一种阻抗6Ω、功率2.5GW的长脉冲功率模块。为了提高单模块输出功率、 优化模块空间结构、减小脉冲波形畸变,采用了两个放电开关同步驱动四条环形Blumlein PFN 的设计思想,实现高压电 脉冲对直线变压器初级线圈的四端口对称馈电。借助激光触发火花开关技术,初步开展了LTD 电压叠加实验研究,在两 级2.5GW 脉冲功率模块上获得了功率5.2GW、半宽160ns、重频5Hz 的脉冲输出。