城市民用建筑节能探讨

简要阐述了城市民用建筑节能的必要性，论述了节能应遵循的基本原则。提出民用建筑节能潜力不可估量,意义重大。     

Phase transformation and crystal growth behavior of 8mol% (SmO1.5, GdO1.5, and YO1.5) stabilized ZrO2 powders

Nanocrystalline powders of ZrO2–8mol%SmO1.5(8SmSZ), ZrO2–8mol%GdO1.5 (8GdSZ), and ZrO2–8mol%YO1.5 (8YSZ) were prepared by a simple reverse-coprecipitation technique. Differential thermal analysis/thermogravimetry (DTA/TG), Fourier transform infra-red spectroscopy (FTIR), X-ray diffraction (XRD), Raman spectroscopy, and high-resolution transmission electron microscopy (HRTEM) were used to study the phase transformation and crystal growth behavior. The DTA results showed that the ZrO2 freeze-dried precipitates crystallized at 529, 465, and 467°C in the case of 8SmSZ, 8GdSZ, and 8YSZ, respectively. The XRD and Raman results confirmed the presence of tetragonal ZrO2 when the dried precipitates were calcined in the temperature range from 600 to 1000°C for 2 h. The crystallite size increased with increasing calcination temperature. The activation energies were calculated as 12.39, 12.45, and 16.59 kJ/mol for 8SmSZ, 8GdSZ, and 8YSZ respectively.     

乳腺X线机检定方法研究

乳腺X线机是临床医疗常用仪器,其性能直接关系到病人的生命安全。本文介绍了乳腺X线机的原理和相关参数的检定方法。     

我国房地产市场现状分析和对策研究

从分析我国房地产市场存在的问题入手,提出了启动我国房地产市场的若干对策.     

热力学第三定律与经典理想气体模型的适用条件

指出了经典理想气体与热力学第三定律不相容,在低温情况下,应考虑到量子效应的简并性,经典理想气体概念已不再适用.虽然绝对零度不能达到,但可用物理方法无限趋近它,目前的量级已达pK.     

Rapid reductive degradation of azo dyes by a unique structure of amorphous alloys

An Fe-based amorphous alloy was found to significantly enhance the reductive degradation of an azo dye in aqueous solution. The surface-area normalized rate constant was up to 2.0 L m-2 min-1 at room temperature,an order of magnitude larger than any previously reported value. The activation energy of the degradation process was calculated according to the Arrhenius equation,and a much lower value than those previously reported was obtained. Valence band measurement indicated that a depressed valence band maximum and a widened empty band were established in the amorphous ribbon. The unique structure of the amorphous alloy is important-it may reduce the activation energy of the degradation process and enhance the activity of the electrons,thus accelerating the degradation process.     

氖泡式验电笔验电“反常”现象分析

应用传输理论,解释了电源插座零线断路时出现＂反常＂现象的原因：2绝缘导线长距离并行且相距较近。指出,此带电现象在低压下,一般不会对人体造成伤害。     

论奥德姆的生态哲学思想

奥德姆生态哲学思想有三个基本方面,贯穿其中的是能量概念。一是从物质范式到能量范式的转化。二是以能量概念为前提,主张整体论的研究,同时有限承认还原论的地位。三是以能量范式和整体论为前提,主张人与自然相贯通的审视视野,并由此展开其应用生态学的思想。     

用于AMS的RFQ加速器能散问题研究

将 RFQ 作为加速器质谱系统(AMS)的加速器是AMS小型化的一条可能途径,减小 RFQ 加速器的输出束流能散是实现这一途径的关键.对 RFQ 加速器成形段部分对束流输出能散影响的分析表明,在减小调制系数、极间电压、同步相位,使各参数匹配的同时,适当地增大纵向聚焦力可显著降低 RFQ 输出束流能散.利用变参量 RFQ 动力学模拟程序 RFQDYN 进行模拟优化,得到输出束流能散为0.4%的 RFQ 加速器物理设计.     

西门子S7产品在智能配电系统中的应用

本文主要介绍西门子S7300、S7200系列可编程序控制器及西门子工业现场总线,并通过某酒厂配电室的监控工程实际应用,加以描述其主要特点及功能.