室内空气污染因素对人体的危害及净化技术措施

介绍了室内主要污染因素即化学性、生物性、物理性因素对人体健康的危害及室内空气净化方法：吸附过滤净化技术、低温等离子体技术、臭氧净化技术、光催化技术。主要叙述了纳米光催化技术的原理、光催化剂的制备方法及纳米光催化技术在室内空气净化中的应用。     

Quantum confinement effect in SiO2 films containing Ge microcrystallites

SiO₂ thin films embedded with Ge microcrystallites (Ge-SiO₂ films) were prepared by RF-magnetron co-sputtering method from a composite target of Ge and SiO₂. The average size of Ge crystallites can be modulated by the experiment parameters. The optical absorption and non-linear optical properties of Ge-SiO₂ films were measured. The blue shift of the optical absorption edge, the saturated absorption and two-photon absorption under the condition of resonant absorption have been observed, and are discussed according to the quantum confinement effect.     

胶料介电特性的全填充短路波导测试和分析

采用微波测试法中的全填充短路波导测试法测试炭黑胶料硫化过程中介电特性———介电常数εｒ和介电损耗因子ｔａｎδ的变化。测试分析结果表明,随着胶料交联密度增大,εｒ增大;炭黑粒径越小、比表面积越大、结构越高,胶料的ｔａｎδ越大;同一硫化条件下,ＮＲ、ＢＲ、ＳＢＲ、充油顺丁橡胶和充油丁苯橡胶胶料的εｒ顺次减小。     

东方Cheese发酵过程中异黄酮、苷元及组分的研究

东方Cheese经毛霉发酵能去除某些过敏源,这种无盐制品深受日本民众欢迎。文中通过正交试验优化了东方Cheese中异黄酮的提取条件。采用了三波长二标样法和HPLC测定异黄酮含量和组成。检测了东方Cheese发酵过程中异黄酮含量及组成的变化:异黄酮的总量降低了37.90%;其中糖苷由34.02μg/mL降至3.11μg/mL(即已有90.86%糖苷转化为苷元),苷元含量则相应的由0.97μg/mL升至18.62μg/mL。认为异黄酮总量降低以及组成变化的主要因素是糖苷到苷元分子质量的降低和样品含水量提高;发酵后期限制组成变化的主要因素是底物浓度的降低。     

水平双向地震作用下薄壁方形截面钢桥墩#br# 抗震性能试验及实用算法研究

钢板局部失稳破坏是钢桥墩结构典型的地震失效模式之一,但目前仍缺乏既能考虑局部失稳影响,又可方便用于工程设计的结构地震反应计算方法。通过对2个薄壁方形截面钢桥墩试件施加沿斜向的水平反复荷载,研究结构的地震破坏形式和抗震性能;在钢材修正双曲面滞回模型的基础上,通过对结构参数分析结果的数据拟合,建立考虑钢板局部失稳影响的方形截面钢桥墩纤维模型算法。结果表明：薄壁方形截面钢桥墩结构在水平双向地震作用下,首先会发生墩底钢板局部失稳,在荷载达到最高点后墩底焊缝处出现超低周疲劳破坏,在两种地震破坏的共同作用下结构承载力迅速下降;通过与试验结果的对比,验证结构地震有效损伤域Ld内的纤维单元采用等效滞回模型能准确反映钢板的局部失稳效应,为工程设计提供一种高精度的实用计算方法。     

Optimizing Data Placement of Loops for Energy Minimization with Multiple Types of Memories

Strict real-time processing and energy efficiency are required by high-performance Digital Signal Processing (DSP) applications. Scratch-Pad Memory (SPM), a software-controlled on-chip memory with small area and low energy consumption, has been widely used in many DSP systems. Various data placement algorithms are proposed to effectively manage data on SPMs. However, none of them can provide optimal solution of data placement problem for array data in loops. In this paper, we study the problem of how to optimally place array data in loops to multiple types of memory units such that the energy and time costs of memory accesses can be minimized. We design a dynamic programming algorithm, Iterational Optimal Data Placement (IODP), to solve data placement problem for loops for processor architectures with multiple types of memory units. According to the experimental results, the IODP algorithm reduced the energy consumption by 20.04 % and 8.98 % compared with a random memory placement method and a greedy algorithm, respectively. It also reduced the memory access time by 19.01 % and 8.62 % compared with a random memory placement method and a greedy approach.     

Iodized oil enhances the thermal effect of high-intensity focused ultrasound on ablating experimental liver cancer

The influence of the biological medium on high-intensity focused ultrasound (HIFU) therapy for ablating experimental liver cancer was studied. In study 1, the temperature rise in the focal zone in the presence of iodized oil or castor oil was observed in vitro. The results showed that HIFU with iodized oil produced a higher and faster temperature rise than did HIFU with castor oil, whether high-power (500 W/cm2) or relatively low-power (136 W/cm2) conditions were used (P = 0.0008 and P = 0.0004 respectively). With the excised liver samples, the temperature also rose higher and more rapidly after injection of iodized oil into the liver than when castor oil was injected (P = 0.0239), and the target liver tissue revealed more radically and extensive destruction with iodized oil than with castor oil. In study 2, 48 nude mice, bearing primary liver cancer LTNM4 implanted subcutaneously, were randomly divided into four groups. Group I (n = 12) were the controls, group II (n = 12) were injected with iodized oil alone, group III (n = 12) received HIFU treatment, and group IV (n = 12) were exposed to HIFU after iodized oil injection. Significant inhibition of tumor growth was seen in groups III and IV as compared with group I or group II (P < 0.05), the tumor growth inhibition rate on the 28th day after treatment being 87% and 93% respectively. Significantly improved survival was noted in groups III and IV compared with groups I and II (P < 0.05). Histologically, group IV showed more complete tumor necrosis than did group III. These data suggest that HIFU combined with iodized oil might have achieve of synergism, location and targeting in the treatment of liver cancer.     

三十米高杆灯的风致振动的测量研究

本文通过环境激励的响应分析，研究了３０米高杆灯的动特性。然后，在发生风致振动的实际条件下，测量了振动频率和振型以及当时的风速，确认振动的原因是一种流固耦合作用形成的风的尾流脱落激励引起结构共振。文中讨论了环境激励响应测量的理论依据，测量方法、数据采集和分析技术，并给出了避免风致振动的理论依据及有关设计公式。