摘要：描述了n 沟道动态电位DTMOs半导体器件的直流和高频特性 ,该器件制造采用了低功耗cMOssOc工艺 ,同时也包含了高密度嵌入式DRAM技术 .在本工作中的DTMOs器件在较早时候就发现性能优于本体接地 (GB)和本体浮地 (FB)的MOsFET器件 .本器件具有无特性曲线缠绕、gm=93 6μs/ μm ,gout=3 6μs/ μm ,Ion/Ioff=2 10 μA/ 0 .1pA ,在Vdd=1V时fmax=3 2GHz的良好特性 ,特别适用于低电压嵌入式基频电路并具有对射频RF前端电路的极佳性能 ,因此可以使嵌入式DRAM、数字电路、模拟电路和RF射频电路混合于一体 ,用在超低功耗、低成本的sOc(系统集成 )

摘要：The fields of regenerative medicine and tissue engineering offer new therapeutic options to restore,maintain or improve tissue function following disease or *** maximize the biological function of a tissue-engineered clinical product,specific conditions must be maintained within a bioreactor to allow the maturation of the product in preparation for ***,the bioreactor should be designed to mimic the mechanical,electrochemical and biochemical environment that the product will be exposed to in ***-time monitoring of the functional capacity of tissue-engineered products during manufacturing is a critical component of the quality management *** present review provides a brief overview of bioreactor engineering *** addition,strategies for bioreactor automation,in-line product monitoring and quality assurance are discussed.

摘要：试验旨在确定纤维分解酶对高精料(48%日粮干物质)或低精料(33%日粮干物质)日粮泌乳奶牛生产性能的影响。第1个试验,将体重为589±20kg的泌乳22±3d荷斯坦奶牛60头采用2×2因子试验,随机分为低精料日粮(Lc组)、加酶低精料日粮(LcE组)、高精料日粮(Hc组)和加酶高精料日粮(HcE组)。添加酶3.4mg·kg-1干物质,每天把酶喷到全混合日粮上,试验期63d。第2个试验,在4个18d时期,采用4×4拉丁方设计,选择装有瘤胃套管的奶牛4头,测定对瘤胃发酵和原位瘤胃干物质降解的影响。试验结果表明,酶不会影响奶牛干物质采食量(23.9、22.3kg·d-1)或产奶量(32.8、34.2kg·d-1),但是降低估计甲烷产量,提高挥发性脂肪酸总浓度(114.5、125.7mM)、干物质表观总消化道消化率(69.8%、72.6%)、粗蛋白(69.2%、73.3%)、酸性洗涤纤维(50.4%、54.8%)、中性洗涤纤维(53.7%、55.4%)和产奶效率(1.44、1.60㎏牛奶·kg-1干物质)。饲喂较多的精料,提高奶牛干物质采食量(21.5、24.8kg·d-1)、产奶量(32.2、34.7kg·d-1)、乳蛋白产量(0.89、0.99kg·d-1)和干物质(69.9%、72.6%),但是降低瘤胃pH(6.31、6.06)。与饲喂Hc奶牛比较,饲喂LcE的奶牛有较低的干物质采食量(20.8、25.7kg·d-1)和粗蛋白采食量(3.9、4.8kg·d-1),较高的瘤胃pH(6.36、6.10),相似的产奶量(33.2±1.1kg·d-1)。因此,饲喂LcE奶牛的产奶效率比饲喂Hc奶牛高(1.69、1.42kg牛奶·kg-1干物质)。这种纤维分解酶提高了干物质、粗蛋白、中性洗涤纤维和酸性洗涤纤维的消化率,提高奶牛的产奶效率。给低精料日粮应用酶可获得与饲喂未添加酶的高精料日粮奶牛一样多的产奶量。

摘要：In this paper, the nonlinear state feedback controller has been developed to control the pressures of the oxygen and the hydrogen in the PEM（Proton Exchange Membrane） fuel cell system. Nonlinear model of the PEM fuel cell system was introduced to study the design problems of the state observer and model based controller. A cascade observer using the filtering technique was used to estimate the pressure derivatives of the cathode and the anode in the system. In order to estimate the pressures of the cathode and the anode, the sliding mode observer was designed by using these pressure derivatives. To estimate the oxygen pressure and the hydrogen pressure in the system, the nonlinear state observer was designed by using the cathode pressure estimates and the anode it. These results will be very useful to design the state feedback controller. The validity of the proposed observers and the controller has been investigated by using a Lyapunov＇s stability analysis strategy.

摘要：Numerical simulation technology was applied for optimizing the casting design and conditions in large cast iron castings for marine engine. By the simulation of mold filling and solidification sequences the problems of the previous casting conditions were analyzed and marked improvements for large cylinder liner parts were derived from these results. Especially the amount and positions of chills were optimized to increase the mechanical properties and to minimize the shrinkage and microporosity in the castings. Ultrasonic testing, penetration testing and mechanical property testing were carried out for the parts with the modified casting conditions. It showed that no defects in the castings were found and the productivity could be distinctly increased. The mechanical properties satisfied also the specification demanded.

摘要：本文研究了一种埋入式MEMs(微电子机械系统 )无线应变片性能的实验标定方法。通过引入一个当量应变片 ,遵照标准应变片的标定规定 ,本文设计了实用有效的实验标定步骤。分别对标准应变片和MEMs试样进行完全相同的拉伸实验 ,从而得到埋入MEMs应变片的应变片系数 (灵敏度 )为 13,同时获得在实验试样的制作条件下 ,测量应变与实际应变之比为 2。

摘要：DRAM器件制造商通过缩小设计规则、芯片尺寸来提高存储器性能和密度的方法，正面临着众多挑战。增大电容面积，使用更高介电常数的材料，以及减薄介电材料厚度等方法都能够继续延续电容的形式和功能。

摘要：主要探讨了硫酸干吸塔设计的制造材料、塔底结构、填料类型、分酸器类型、除雾器和衬砖,对合金塔和衬砖塔进行了对比。介绍了硫酸干吸塔的类型、确定酸塔直径需考虑的因素、填料高度的计算,以及酸塔的安装、更换和维护保养。

摘要：铁电纳米粒子悬浮在向列相液晶母体中,增强介电各向异性,而且对施加的电场信号敏感。本文也展示了纳米粒子对所述复合材料可实现的总的相变的作用。这种方法也许可应用于设计新型显示材料。

摘要：研究了在250MPa喷油压力下轻型柴油机喷油器喷嘴几何结构对燃油耗和废气排放特性的影响。试验中采用的发动机是1台排量为0.4L的单缸压燃式发动机。柴油燃料喷射装置在250MPa喷油压力条件下工作。分别比较了具有8、9和10个喷孔的3种喷油器。随喷油器喷孔数的增加,喷孔直径缩小,由105μm减小至95μm,点火延迟缩短。在不采用废气再循环(EGR)的条件下,具有多喷孔数的喷油器颗粒物(PM)排放更少。该结果表明,小喷孔直径改善了燃油雾化效果,燃油喷雾面积与大喷孔数喷油器保持相同。尽管如此,这三种喷油器在更高EGR率和更高喷油压力下的氮氧化物(NOx)和PM折中关系类似。高喷油压力对减少PM排放效果最为明显,而在这些条件下,喷孔几何结构对PM排放几乎不产生影响。在这种条件下,更大喷孔直径导致的喷雾贯穿距离增大也有助于减少PM排放。由于这三种喷油器具有相同的燃油体积流量和类似的缸内压力轨迹,因此,其指示燃油消耗率均处于相同的水平。另外,在采用相同喷孔直径(95μm)条件下,验证了8孔和10孔喷油器喷孔数的影响。喷油速率越高,喷雾次数越多,喷孔数由8增至10,燃油耗越低,PM排放越少。试验结果为车用发动机喷油器喷嘴喷孔数和喷孔直径优化设计提供了参考标准。