Efficient visible light driven photocatalytic removal of NO with aerosol flow synthesized B, N-codoped TiO2 hollow spheres

In this study, we demonstrate that aerosol assisted flow synthesized B, N-codoped TiO(2) photocatalyst possesses superior photocatalytic activity to pure and single element doped counterparts on the degradation of NO in a flow system under both simulated solar light and visible light irradiation. Characterization results revealed that B, N-codoped TiO(2) photocatalyst was composed of hollow microspheres. Boron and nitrogen were in the form of Ti-O-B and N-Ti-O structures, respectively. The introduction of B and N into the TiO(2) lattice could effectively tune the band gap of TiO(2) and extend its optical response to the visible-light region. The synergistic effect of B and N codoping on visible light driven photocatalytic activity enhancement of TiO(2) was discussed on the basis of experimental results.     

The link between ethnic diversity and scientific impact: the mediating effect of novelty and audience diversity

Scientometrics - Understanding the nature and value of scientific collaboration is essential for sound management and proactive research policies. One component of collaboration is the composition...     

应用静态破碎技术拆除高13层的框架楼

通过采用静态破碎剂拆除13层框架楼的实例,介绍了等能分布破碎设计原理。通过密布孔、细处理、断横梁、开地板、剔除钢筋等手段弱化框架与立柱强度,有效地控制了静态定向,加快了破碎坍塌速度,攻克了慢载倾倒、难控制定向及胀裂而不倒的难题,实现了安全无公害、低碳环保的拆除效果。在应用静态破碎技术拆除高层框架楼实践中积累了一些成功经验,可供同类工程借鉴参考。     

Extremely narrowed spontaneous emission spectrum induced by elliptically polarized light

Abstract

We demonstrate the control of spontaneous emission from a five-level atom embedded in a modified reservoir under the action of a single control beam with elliptical polarization. For different initial-state preparations, we take into account the influence of the phase difference between the two circularly polarized components of the control beam on the behavior of spontaneous emission. For the ground initial states, the spontaneous emission spectrum usually shows ultranarrow central lines which are greatly enhanced. In contrast, for the excited initial states, these enhanced ultranarrow lines are significantly suppressed due to the destructive quantum interference. Furthermore, our numerical simulations indicate that the multipeak structure appears in the presence of the elliptically polarized control beam and external magnetic field. Such a scheme for controlling spontaneous emission may find applications in high-precision spectroscopy.     

Analysis and enhancement of the detection performance of the PMF-FFT acquisition algorithm for spread spectrum communication systems

针对扩频通信系统部分匹配滤波结合快速傅立叶变换(PMF-FFT)捕获算法由于FFT对频偏补偿不完全而引起相关能量衰减从而导致检测概率降低的问题,研究了检测器的输出特性,利用剩余频偏存在时检测器输出相关能量扩展的特点,提出了将相邻检测单元输出值累加作为检测变量的相邻bin联合检测方案,理论推导了该方案的虚警概率、检测概率.仿真结果表明,与原检测方案相比,该方案不仅能够提高检测概率,而且在不同剩余频偏条件下的检测具有良好的鲁棒性,适用于高动态低信噪比条件下扩频信号的快速捕获.     

鞋底止滑性能的研究进展

论述了鞋底止滑性能的研究目的和意义以及国内外在鞋底止滑性能方面的研究现状 ,在此基础上对其发展趋势作了预测 ,有助于进一步研究鞋底的止滑性能和提高鞋子的防滑性能。     

非淀粉多糖复合酶制剂对肉鸡养分表观利用率及肠道组织形态结构的影响

研究非淀粉多糖(NSP)复合酶制剂对肉鸡养分表观利用率以及肠道组织形态结构的影响.结果表明:NSP复合酶制剂F对肉鸡玉米-豆粕型饲粮1～21 d养分表观利用率无改善趋势(P＞0.20);对肉鸡玉米-豆粕-DDGS型饲粮22～42 d干物质、能量表观消化利用率有提高趋势(P＜0.20).NSP复合酶制剂F对采食玉米-豆粕型饲粮的肉鸡1～21 d肠道组织形态结构表现正负双面效应,能显著降低采食玉米-豆粕- DDGS型饲粮的肉鸡生长后期空肠肌层厚度,改善空肠的组织形态结构.     

The effect of osmosis pretreatment on hot‐air drying and microwave drying characteristics of chili (Capsicum annuum L.) flesh

Chili flesh pretreated with or without osmotic dehydration (OD) was dried in the hot‐air drying (AD) oven at 50–80 °C or in the microwave drying (MD) oven at 60–180 W. Results showed that the samples osmotically treated in mixed solution (10% salt + 50% sucrose) had the best dehydration effect as compared with single salt or sugar solutions. During the drying process, osmotically treated samples had one falling‐rate period and their effective moisture diffusivities (D_eff) showed a rapidly linear increase with the decrease in moisture content, while directly drying samples showed a three‐phase falling‐rate period and their D_eff increased gradually at the initial period and then rapidly at the final period. When the moisture content decreased, the activation energy increased gradually; however, for AD after OD, it decreased. Among all the processes, MD at 60 W after OD presented the largest vitamin C retention rate and the best colour difference, needing less drying time.     

胰蛋白酶的提取纯化及酶学性质的研究

选用新鲜猪胰脏,经破碎、酸化、过滤、盐析等步骤后制得粗酶液,将粗酶液分离纯化得纯胰蛋白酶,研究了pH值、温度、吸光值对胰蛋白酶的酶学性质的影响,进而得出胰蛋白的酶学性质和最适的生理活性.     

大麦糟水溶性膳食纤维提取工艺的优化

用Box-Benhnken中心组合实验设计探讨了碱法提取大麦糟可溶性膳食纤维(SDF)的最佳工艺条件,建立了包括NaOH质量分数,提取温度,反应时间和液固比的4因素回归模型。结果表明,大麦糟SDF的最佳提取工艺参数为:NaOH质量分数为1.10%,提取温度为72℃,反应时间为75 min,液固比为20∶1,在此条件下大麦糟SDF提取率达19.28%(原料中SDF含量为21.21%)。