辉锑矿矿浆电解浸出机理的研究

研究了辉锑矿矿浆电解阳极室浸出反应机理．结果表明，辉锑矿的溶解符合核收缩模型的动力学规律，浸出速率受混合过程控制，表观活化能为25.10KJ/mol．浸出主反应是辉锑矿被阳极上析出的氯氧化，SCl2是氧化反应的中间产物．     

Multigrid computation for curve fitting in the wavelet domain

A multi-layer multigrid algorithm for curve fitting in the wavelet domain is presented. This algorithm is achieved by applying a wavelet transform to each grid of the conventional multigrid structure. Using a wavelet transform, the convergent rate in each grid is improved and the total system can converge more quickly     

A CMOS channel-select filter for a direct-conversion wirelessreceiver

A highly selective and linear switched-capacitor channel-select filter is fabricated in 1-μm CMOS for a direct-conversion wireless receiver operating in the 902-928 MHz ISM band. The filter selects a 230-kHz wide channel and attenuates by at least 50 dB from 320 kHz to 57 MHz. The input IP3 is +30 dBm, the input-referred noise in the passband is 70 nV/√Hz, and the circuit takes 4.6 mA from a 3.3 V supply. Direct subsampling of the 915 MHz RF input signal by the filter front-end is also demonstrated with only a small degradation in linearity. The input noise voltage is halved in a redesign while keeping the current drain unchanged     

大花水水电站引水隧洞聚丙烯纤维喷锚混凝土试验研究

大花水水电站引水隧洞洞径较大，且地质状况复杂，拟在较好地质条件的Ⅱ、Ⅲ类围岩洞段采用掺聚丙烯纤维的喷锚混凝土代替常规钢筋混凝土衬砌方案。经室内喷锚混凝土配合比及施工工艺试验研究后，提供了可供现场使用的喷锚混凝土配合比，并提出了现场施工工艺要求，为该工程引水隧洞喷锚混凝土施工创造了有利条件。     

太湖流域河道内用水控制指标分析计算

河道内用水控制指标是反映水资源供需平衡状况、协调河道内外用水、统筹上下游用水关系及流域和区域水资源配置优化程度的重要指标。文中根据太湖流域特点,选取了太湖及平原河网区13个代表站的水位资料,通过频率分析法和Tennant法,提出在满足生活、生产和生态用水条件下,太湖和流域平原河网区代表站允许的最低旬平均水位控制指标,及黄浦江松浦大桥断面允许的最小月净泄量控制指标。     

从住吉的长屋看安藤的建筑设计内涵

使安藤一举成名的"住吉的长屋"(1976)是大阪旧区中的小住宅。通过对住吉的长屋的介绍并从建筑设计角度进行剖析,论述了安藤如何使空间与自然相结合,如何用几何形体与纯粹空间诠释本土文化,给空间注入光的活力,进而赋予建筑以精神。     

Precipitation behavior of σ phase in fusion zone of dissimilar stainless steel welds during multi-pass GTAW process

The purpose of this study is to investigate the precipitation characteristics of σ phase in the fusion zone of stainless steel welds at various welding passes during a tungsten are welding (GTAW) process. The morphology, quantity, and chemical composition of the δ-ferrite and σ phase were analyzed using optical microscopy (OM), a ferritscope (FS), a X-ray diffractometer (XRD), scanning electron microscopy (SEM), an electron probe micro-analyzer (EPMA), and a wavelength dispersive spectrometer (WDS), respectively. Massive δ-ferrite was observed in the fusion zone of the first pass welds during welding of dissimilar stainless steels. The σ phase precipitated at the inner δ-ferrite particles and decreased δ-ferrite content during the third pass welding. The σ and δ phases can be stabilized by Si element, which promoted the phase transformation of σ→ϱ+λ₂ in the fusion zone of the third pass welds. It was found that the σ phase was a Fe−Cr−Si intermetallic compound found in the fusion zone of the third pass welds during multi-pass welding.     

上海市吴淞工业区大气PM2.5水溶成分的元素分析及细胞毒性研究

通过ICP-MS测定了上海市吴淞地区大气PM2.5水溶成分金属元素含量,通过四唑盐(MTT)测定细胞存活率,通过超氧化歧化酶(SOD)和丙二醛(MDA)两个指标测定细胞氧化损伤,琼脂糖凝胶电泳测定细胞内DNA损伤,流式细胞仪(Flow cytometry)检测细胞凋亡和周期等实验研究了大气PM2.5水溶成分的细胞毒性.实验结果表明:PM2.5可溶成分中Zn元素含量最高,PM2.5在一定浓度范围内能导致细胞死亡,引起细胞的氧化损伤,影响DNA的复制,阻碍细胞增殖,但没有诱导细胞凋亡.PM2.5中可溶金属离子对细胞毒性表现为联合作用.     

数字图像边缘检测算子的性能实验比较

本文对数字图像中几种具有代表性的边缘检测算子进行了理论分析，并通过VC编程实验，对各种算法进行实现，通过比较得出了各自的优缺点和适用范围。     

渝东地区石炭系储层特征及分布规律研究

在对岩性、物性、微观孔隙结构、主控因素等研究的基础上，依据测井储层处理并结合地震储层预测研究储层分布规律认为：渝东地区石炭系储层除厚度变化大外，其特征与川东有很大的相似性，储集岩为颗粒云岩、晶粒云岩、角砾云岩，储层物性以黄龙组二段最好，为低孔低渗储层。储集空间为孔隙、裂逢和洞穴，主要孔隙类型为粒间溶孔、粒内溶孔、砾间溶孔、砾内溶孔，裂缝发育。储集类型为裂缝-孔隙型，以Ⅱ、Ⅲ类储层为主。储层主要受到沉积微相、成岩作用及后期构造活动影响和控制；主要分布在黄龙组二段，厚度变化大即0m-30m，总体上呈西厚东薄。池34井区-寨沟4井区-云安3井区一带是有利储层的主要分布区。