摘要：试验旨在研究接受高温干燥对潜在多微生物益生素的影响。潜在多微生物益生素通过固体基质发酵生产,在低温（LT,40℃72h）或高温（hT,70℃36h）下干燥。试验1,288头断奶仔猪（体重6.43±0.68kg）根据体重分配给4个处理（每个处理4个猪圈,每个猪圈18头猪）。日粮处理为负对照组（NC组,不添加抗菌剂的基础日粮）、正对照组（PC组,基础日粮＋金霉素0.1%）、含LT益生素0.03%的基础日粮、含hT益生素0.03%的基础日粮。日粮分两个阶段饲喂,0~14d为第1阶段,15~28d为第2阶段。评估猪的生长性能、总消化道养分表观消化率（ATTD,第28天）和粪便微生物区系（第14和28天）。试验结果表明,在28d试验期中,与饲喂NC组日粮的猪只比较,饲喂PC组和益生素日粮的猪只有较高的平均日增重（P〈0.001）、酸性洗涤纤维进食量（P〈0.05）和饲料转化率（P〈0.01）。与饲喂NC组日粮的猪只比较,饲喂益生素日粮猪只干物质的ATTD和总能较高（P〈0.05）。第28天,与饲喂NC组日粮的猪只比较,饲喂PC组和益生素日粮猪只粪便中发现较少的梭状芽胞杆菌（P〈0.01）,不过,饲喂LT益生素和hT益生素日粮猪只之间的生长性能、干物质ATTD和总能及粪便梭状芽胞杆菌菌群相似。试验2,288头断奶仔猪（起始体重5.84±0.18kg）根据体重以2×2因子设计分为4个处理,研究添加或不添加抗生素（金霉素,0、0.1%）的2个hT（0.30、0.60%）益生素水平对生产性能、ATTD、小肠形态学及粪便与肠道菌群的影响。试验结果表明,饲喂hT益生素0.60%日粮的仔猪改善了总平均日增重、干物质ATTD、总能及粪便和肠道中的乳酸菌菌群,降低粪便和回肠中梭状芽胞杆菌和大肠杆菌群（第14天）（P〈0.05）。抗生素的加入改善了总的平均日增重、酸性洗涤纤维进食量和干物质ATTD（第14天）,降低粪便梭状芽胞杆菌菌群数量（第28天）（P〈0.05）。在饲喂hT益生素0.60%和抗生素日粮的猪只中,观察到空肠和回肠绒毛高度、回肠绒毛高度与腺窝深度的比值增加（P〈0.05）。试验结果表明,较高的干燥温度对潜在多微生物益生素的功效无影响。不过,高温干燥益生素以0.60%比例加入日粮时更有效,而抗生素的加入可改善猪只的生产性能,但是抗生素与益生素之间无交互作用。

摘要：A power management unit （PMU） chip supplying dual panel supply voltage, which has a low electro-magnetic interference （EMI） characteristic and is favorable for miniaturization, is designed. A two-phase charge pump circuit using external pumping capacitor increases its pumping current and works out the charge-loss problem by using bulk-potential biasing circuit. A low-power start-up circuit is also proposed to reduce the power consumption of the band-gap reference voltage generator. And the ring oscillator used in the ELVSS power circuit is designed with logic devices by supplying the logic power supply to reduce the layout area. The PMU chip is designed with MagnaChip＇s 0.25 μ high-voltage process. The driving currents of ELVDD and ELVSS are more than 50 mA when a SPICE simulation is done.

摘要：A multi-bit antifuse-type one-time programmable （OTP） memory is designed, which has a smaller area and a shorter programming time compared with the conventional single-bit antifuse-type OTP memory. While the conventional antifuse-type OTP memory can store a bit per cell, a proposed OTP memory can store two consecutive bits per cell through a data compression technique. The 1 kbit OTP memory designed with Magnachip 0.18 μm CMOS （complementary metal-oxide semiconductor） process is 34% smaller than the conventional single-bit antifuse-type OTP memory since the sizes of cell array and row decoder are reduced. And the programming time of the proposed OTP memory is nearly 50% smaller than that of the conventional counterpart since two consecutive bytes can be compressed and programmed into eight OTP cells at once. The layout area is 214 μm× 327 μ,, and the read current is simulated to be 30.4 μA.

摘要：介绍了所研制的1 100 kV、50 kA GIS用断路器的技术规范、基本结构及合闸电阻的合理布置;利用商用Maxwell2D,3D软件及专用的程序,对断路器灭弧室的电场分布情况进行了分析,对合闸电阻的热容量进行了计算,并做了相关的试验验证,证明该型断路器的开断性能良好,其所配用的合闸电阻的热容量满足使用要求。

摘要：A gas liquid centrifugal separator is widely used in industry on account of its simple geometry and little maintenance. These separators have considerable advantages over filters, scrubbers or precipitators in term of compact design, lower pressure drop and higher capacity. A gas liquid centrifugal separator is a device that utilizes centrifugal forces and low pressure caused by rotational motion to separate liquid from gas by density differences. Efficient and reliable separation is required for the optimum operation. These separators are often operated at less than peak efficiency due to the entrainment of separated liquid through an outlet pipe which is closely associated with the very complicated flow phenomena involved. Design parameters such as length of the separation space, vane exit angle, inlet to outlet diameter ratio, models for separation efficiency and pressure drop as a function of physical dimensions are not available in literature. This leaves the designer with very little to go on except known designs and experimentation. The aim of present study is to perform a parametric study to get higher efficiency for gas-liquid separator. A parametric study has been carded out with the help of CFD tools to analyze a separation performance of a centrifugal separator by varying the length of separator space. The best design parameters are analyzed based upon obtained results, tangential velocities, vortices, total pressure losses. From the present study several attempts are made to improve the performance of conventional centrifugal separators.

摘要：研究目的在于强调利用非连续裂隙网络建立水文地质模型所需的核心方法,在特定场地,建立可行的水文地质模型在隧道的排水系统设计和建设中是非常必要的。根据水晶岩石上钻探的试验结果,建立了hydroDFN模型,通过观察到的破裂现象和导水参数进行集中调试,以确认导水的参数。通过hydroDFN模块,计算等效块渗透系数,并把计算出来的等效块渗透系数和现场测试数据加以分析和比较。

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：为测定热处理对豆粕（SBM）表观回肠消化率和标准回肠消化率（SID）的影响，本试验将常规去壳豆粕（48.5%蛋白）分成4组，一份未经额外热处理，一份在125℃下高压蒸汽处理15 min，一份在125℃下高压蒸汽处理30 min，另一份在125℃下烘箱烘干30 min。制定四种豆粕-玉米淀粉型日粮配方，且每个配方只能使用上述四种豆粕中的一种，作为每种日粮中唯一氨基酸来源。用无氮日粮配方来估算基础内源性氨基酸损失。分别在初始体重为（25.3±2.0）kg的10头阉公猪回肠末端安装一个T-型瘘管。采用5×5拉丁方设计法，将试验猪分成5个日粮处理组，5个重复处理周期。每个处理周期持续7 d，在第6天和第7天收集回肠食糜。试验结果表明，随着高压蒸汽处理时间（0~30 min）的延长，蛋白质和所有氨基酸的表观回肠消化率和标准回肠消化率呈线性降低（P＜0.01）。糠氨酸含量和豆粕样品的颜色表明高压蒸汽处理导致豆粕产生美拉德反应。然而，125℃烘箱干燥30min并未改变豆粕中蛋白和氨基酸标准回肠消化率，也没有改变SBM的糠氨酸含量（P＞0.10），且烘箱处理的样品颜色表明该样品并未受到热处理破坏。总之，热蒸汽处理时间从0 min增至30 min，高压蒸汽处理豆粕的氨基酸消化率呈线性降低，降低原因很可能是由于125℃高压蒸汽处理导致豆粕产生美拉德反应。

摘要：本文对自生反应法合成碳化钛颗粒增强Ti-6Al4V基复合材料的制备过程进行了研究,设计了两种反应途径,并成功地制备出该类复合材料.碳化钛颗粒的体积百分含量可以通过处理温度、时间等工艺参数来控制,碳化钛的显微硬度达到2050～2300 kg/mm2左右.特别是,通过这一化学反应处理,钛基体中的氯含量被明显地降低.最后,测定了该类复合材料的硬度和拉伸性能,结果表明,其性能随碳化钛颗粒体积分数的增加而升高,特别其高温特性尤为明显.

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。