发展以低成本和软技术为核心的江西省绿色建筑

绿色建筑将成为未来建筑的发展趋势。针对本省经济社会发展水平,江西省现阶段应以＂因地制宜＂、＂经济适用＂、＂本土科技＂为原则,大力推广以低成本和软技术为核心的绿色建筑,从而推进绿色建筑的全面发展,实现节能减排的战略目标。     

浅谈软土地基倒垂观测孔的施工方法

结合西霞院工程实例,浅述了软土地基地质条件下倒垂观测孔的造孔、测斜、计算以及安装埋设的方法,指出软土地基倒垂观测孔的施工技术难点及应注意的问题.     

Contribution of soft tissue deformation below the sacrum to the measurement of total height loss in sitting

This study investigated the contribution of soft tissue deformation below the sacrum (S) and vertical spinal creep to total height loss (THL) measured in sitting. Eight asymptomatic subjects (four males, four females) aged between 21 and 51 years were measured. Simultaneous measurement of THL and S were commenced after the subjects had been sitting for 5 min. THL was recorded while subjects were positioned in a seated stadiometer, which controlled their spinal posture. S was measured by placing an ultrasound transducer at the level of the top of the subject's sacrum. Over 25 min of sitting with loaded and unloaded interventions applied to their spine, different response characteristics between S and THL were noted. This study demonstrated that soft tissues below the sacrum could contribute up to 30% on average of total height loss. This suggests that researchers should take into account the soft tissue deformation outside the spine when studying vertical creep in sitting.     

聚丙烯反应器熔融指数预测控制算法

针对双环管聚丙烯反应器中的熔融指数难以在线测量的问题,采用机理建模方法建立熔融指数软测量模型。为了实现预测控制,将软测量模型转化为Hammerstein模型形式作为预测模型。并基于这个预测模型设计预测控制器,实现了聚合反应过程的熔融指数预测控制,仿真结果验证了该方法的有效性。     

Corrosion of amorphous and nanocrystalline Fe-based alloys and its influence on their magnetic behavior

Nanocrystalline soft magnetic materials with low coercivity, high saturation magnetization and high permeability are commonly used as cores in transformers and generators in stress and field sensors. The influence of factors connected with corrosion is almost impossible to eliminate. In the present work, a comparative study of the electrochemical behavior of Fe₇₈Si₁₃B₉ and Fe_73.5Si_13.5B₉Nb₃Cu₁ amorphous and nanocrystallized alloys, tested in 0.5 M NaCl solution, has been performed by linear polarization and electrochemical impedance spectroscopy methods. Changes of magnetic properties including coercivity, induction and magnetic retentivity were analyzed. These properties were investigated as a function of the structure of primary amorphous ribbons and as a function of corrosion environment type, in which longitudinally and transversely cut ribbon specimens were exposed for 15 days. The best magnetic properties were found for the Fe₇₈Si₉B₁₃ ribbon after a structural relaxation at a temperature of 350 °C for an hour and for the Fe_73.5Si_13.5B₉Nb₃Cu₁ ribbon after a primary crystallization at a temperature of 550 °C for an hour. Corrosion did not cause the direct degradation of the magnetic properties of the Fe₇₈Si₉B₁₃ and Fe_73.5Si_13.5B₉Nb₃Cu₁ alloys. The corrosion processes occurring on the surface of the Fe_73.5Si_13.5B₉Nb₃Cu₁ alloy ribbon with the amorphous structures improve induction B_s. Most probably it is connected with the decrease of undesirable stresses blocking a motion of magnetic domain walls on the ribbon surface. Changes of corrosion mechanism depending on structure and applied solution were analyzed. The electrochemical impedance experiment were performed at open circuit potential for amorphous and nanocrystalline specimens. Two electrochemical corrosion mechanisms of Fe_73.5Si_13.5B₉Nb₃Cu₁ alloy in 0.5 M NaCl solution were found. Charge transfer control mechanism is typical for amorphous (as received) alloys. Mixed mechanism-mass transport and charge transfer controlled was observed for nanocrystalline Fe_73.5Si_13.5B₉Nb₃Cu₁ alloy.     

DC-DC变换器技术现状及未来

从工程实际的角度介绍了DC-DC技术的现状及发展，给出当今国际顶级DC-DC产品的实用技术、专利技术及普遍采用的特有技术。指出了半导体技术进步给DC-DC技术带来的巨大变化。并指出了DC-DC的新型变换电路托朴和数字化方向。     

Electromagnetic shielding properties of soft magnetic metal and ferrite composites for application to suppress noise in a radio frequency range

Electromagnetic shielding properties of soft magnetic metal alloy (Fe-Al-Si) flakes and Ni-Zn ferrite composites for effective suppression of broadband and high frequency noise were investigated. In the soft magnetic composites, the maxima of reflection loss were shifted to high frequency with increase in content of Ni-Zn ferrite. The composites with content of 50 and 70% ferrite exhibited broadband absorptive characteristics. The broadband character- istics might be caused by the extended resonance due to an overlap between imaginary permeability and permittivity of the two composites over the frequency range from 2 to 10 GHz.     

电动机软起动器的应用

本文对软起动器的特点作了介绍并对现场应用控制电路的设计进行了探讨。     

振动沉管碎石桩在加固软弱地基中的应用

结合吉化公司动力厂水煤浆贮罐工程实际，对振动沉管碎石桩的成桩模式进行对比试验并对复合地基进行静载试验，通过对试验结果进行分析，提出对振动沉管碎石桩施工工艺的改进措施同时介绍了振动沉管碎石桩的加固机理，对抓动沉管碎石桩在地基处理中的广泛应用具有重要意义。     

程序Java化过程中的软件工程策略

由于Java语言具有的诸多特性以及Internet和嵌入式系统的普及，对已经投入应用的使用C 语言编写的软件进行Java移植，在软件活动中的比例越来越大以及这一活动过程的特殊性，针对其过程进行的管理控制与开发方法和传统软件活动有所不同，因此讨论了针对移植的策略，并以一个移植项目——FTP Plus为例，证明这些策略的有效性。