传统建筑意趣的现代诠释

文章结合杭州西溪新天地的设计分析,从空间序列的建构、文化氛围的建构以及其中人员活动的建构等方面,讨论了现代开发方式与传统街坊理念之间的平衡之道。     

基于扰动观察法的最大功率跟踪的实现

对光伏并网逆变系统最大功率算法中的扰动观察法的实现问题进行研究。在分析光伏电池伏安特性的基础上,提出扰动观察法的实现算法。通过比较前后两次功率的大小来决定光伏电池电压扰动的方向,使光伏电池最终达到最大功率点。最大功率跟踪过程中直流侧存在功率脉动,干扰最大功率判断。合理设置滤波算法和采样周期,可滤除直流侧功率脉动。通过设置直流电压控制环节,使系统在最大功率跟踪过程中直流电压保持平稳。实验结果表明,该算法可有效跟踪光伏电池最大功率点,适用于光伏并网逆变系统。     

An in-vitro method for prediction of the digestible crude protein content in pig feeds

An in-vitro method using commercially available enzymes for the prediction of the in-vivo digestible crude protein content was developed and tested on seven feedstuffs and 16 diets for pigs. Fat-extracted feed samples were consecutively incubated with pepsin at pH 1 and pancreatin at pH 6.8. From the nitrogen content of the feed sample and of the residue after incubation the in-vitro digestibility of the crude protein was calculated. Using the linear regression of in-vitro on in-vivo digestible crude protein of samples obtained in feeding trials, the in-vivo digestible crude protein content (DXP_p) in g kg^?1 dry matter could be predicted. For feedstuffs and diets the correlation was 0.99 and 0.95 and the residual standard deviation 17 and 6 g kg^?1 dry matter, respectively. In a similar procedure the nitrogen solubilised during incubation with enzymes was analysed. The regression value was similar to that of the original procedure. However, this procedure was abandoned because it was more laborious.     

磁滞及磁饱和效应对磁光光纤传感器的影响

给出了ＩｎＢｉＣａＶＩＧ晶体的磁滞回线,详细分析了磁滞及磁饱和效应对磁光光纤传感器的影响。当所测磁场信号为交变量时,磁滞的影响主要是相位延迟,对幅度及频谱分布影响较小;饱和效应不仅使响应幅值减小,同时还导致明显的频谱变化。     

Ordered Mesoporous In2O3: Synthesis by Structure Replication and Application as a Methane Gas Sensor

The synthesis and characterization of ordered mesoporous In₂O₃ materials by structure replication from hexagonal mesoporous SBA‐15 silica and cubic KIT‐6 silica is presented. Variation of the synthesis parameters allows for different pore sizes and pore wall thicknesses in the products. The In₂O₃ samples turn out to be stable up to temperatures between 450 °C and 650 °C; such high thermal stability is necessary for their application as gas sensors. Test measurements show a high sensitivity to methane gas in concentrations relevant for explosion prevention. The sensitivity is shown to be correlated not only with the surface‐to‐volume ratio, but also with the nanoscopic structural properties of the materials.     

单晶体心立方金属铌裂纹尖端位错增殖行为的 原位研究

位错的增殖对体心立方金属材料的塑性性能有着非常重要的意义,目前对于体心立方位错增殖机制的动态研究主要依赖于计算模拟,实验研究很少见到报道,其位错增殖机制尚存在不确定性.本文利用透射电镜原位拉伸技术,实现了单晶体心立方金属铌(Nb)裂纹尖端位错增殖的原位动态实验观察,并提出了两个位错模型来解释位错增殖以及运动的机制.从实验上不仅证实了之前模拟的预测,而且对现有的模型进行了很好的补充,为体心立方金属材料的塑性变形机制提供了基础实验数据.     

可重构无线HDMI的高吞吐量LDPC码编码器设计

基于可重构理论,采用IEEE802.11n LDPC码编码的快速编码算法,提出了一种可重构的无线HDMI LDPC码编码器设计.该编码器能够支持3种不同码长,4种不同码率.在EP2S90F1020C5 FPGA下,最高频率为83 MHz,最高数据吞吐量为1.1 Gbit/s.     

半导体激光器端面泵浦 Nd∶YAG激光器用In_(0.25)Ga_(0.75) As吸收体被动锁模兼做输出镜

用金属有机气相淀积方法生长了一种新型的吸收体——低温InGaAs(LT-In0.25Ga0.75As).用这种吸收体兼做输出镜,实现了1.06μm半导体端面泵浦Nd∶YAG激光器被动锁模,脉冲宽度为皮秒量级,重复率为150MHz     

在系统可编程通用数字开关ispGDS14的原理及应用

介绍了Lattice公司生产的在系统可编程通用数字开关芯片ispGDS14的内部结构和性能特点，并通过实例说明了在GDS开发环境下对ispGDS14进行编程的方法。     

Investigation of local thermal nonequilibrium effects on oil in situ combustion simulation

In the models developed for oil in situ combustion so far, local thermal equilibrium (LTE) was assumed between reservoir rock and fluids without being validated. As presence of a combustion zone makes the validation of this assumption questionable, in this study a new two-energy equations model is developed describing the temperature fields of rock and fluids separately. Investigating the effect of local thermal nonequilibrium between rock and fluids indicates that LTE will fail if the grain's diameter size order exceeds a millimeter. In this case, using LTE will lead to overestimating the heat and mass transfer rates.