芳纶纤维在轮胎工业中的应用

笔者主要介绍了芳纶纤维(包括长纤维和短纤维)的性能及其在轮胎工业的应用，同时简要叙述了芳纶纤维的分类和发展历史。     

芳纶橡胶输送带的接头强度研究

针对芳纶橡胶输送带接头强度保持率低的问题,本研究以国内外芳纶橡胶输送带接头方案为基础,采用指型插接方案,系统性地探究了指型长径比、贴胶厚度、织物增强层结构等因素对接头强度的影响。实验证明接头强度随长径比的增大而升高;贴胶厚度在1mm时接头强度达到最大,此后接头强度随贴胶厚度的增加而降低;织物增强层沿经向放置的接头强度提高87%,接头强度保持率达到带体强度的60%。     

节能型活性染料的发展状况

综述了开发节能型活性染料的重要性.重点介绍了适用于冷轧堆染色、小浴比染色和涤/棉一浴法染色用活性染料以及高固色率活性染料的发展状况;通过提高染料的耐碱性、溶解度、染深性以及固着率等方面来达到节能减排的目的.     

CY-61100车床尾座铸造过程仿真优化研究

对CY-61100车床尾座铸件充型及凝固过程进行了数值模拟及优化研究。根据模拟的结果及铸造缺陷预测,改进及优化了尾座浇注系统,在工厂实际浇铸生产应用中取得了良好效果。并由此建立了铸造过程CAE仿真优化技术与传统铸造工艺设计有效结合的先进铸造工艺设计模式。     

中国天然气勘探开发现状及物探技术需求

2000年以来,中国石油天然气集团公司在鄂尔多斯盆地、四川盆地、塔里木盆地、松辽盆地、柴达木盆地、渤海湾盆地等的天然气勘探中不断获得新的发现,初步形成了东部、中部、西部协调发展的合理布局。现阶段面临的问题是如何尽快将资源优势转化为经济优势。目前,我国天然气主要储集层为碎屑岩、碳酸盐岩和火山岩三大岩石类型。碎屑岩储层特征表现为我国中部丘陵地区的低孔、低渗的致密砂岩以及西部复杂高陡构造的孔隙砂岩;碳酸盐岩和火山岩储层普遍埋藏较深,非均质性强,缝洞单元难以刻画。因此,必须采用有针对性的地球物理勘探技术,优先发展碎屑岩气藏检测勘探技术,强化地震岩石物理等基础研究,加快碳酸盐岩、火山岩气藏检测技术攻关。同时开展高密度、多波地震勘探等前沿技术研究,为定量评价和产能建设提供技术保障。     

提高储层预测精度技术思路与对策

采用地质、地震、测井人员协同一体化作业，对地下地质目标进行综合预测与评价，可提高储层预测精度，降低预测结果的多解性。主要方法是针对不同的区块，采用不同的方法和对策，首先从单井储层划分对比入手，建立储层沉积模式，同时对地震数据目的层段进行精细解释，建立地层构造模式，用沉积、构造等地质规律来指导和约束反演；利用测井资料对地震资料进行精细标定，建立各井的单井波阻抗模型，建立井数据和地震数据沟通的桥梁；在严格的测井约束、地质模型约束、层位控制下进行储层反演；充分利用地质、地震反演结果、地震参数提取及分析结果、测井、测试和分析化验等资料对储层预测结果进行综合分析与评价。该方法应用于长庆、大庆、准噶尔等实际区块，取得了较好的效果。     

Rapid detection of a Schistosoma mansoni circulating antigen excreted in urine of infected individuals by using a monoclonal antibody

Schistosoma circulating antigens were used to indicate the infection intensity and to assess cure. An immunoglobulin G2a (IgG2a) mouse monoclonal antibody was used in a fast dot-enzyme-linked immunosorbent assay (ELISA; FDA) for rapid and simple diagnosis of schistosomiasis in the field. Seven hundred Egyptians were parasitologically examined for Schistosoma mansoni and other parasitic infections. A rectal biopsy was done as a "gold standard" for individuals showing no S. mansoni eggs in their feces. Egg counts were obtained by the Kato smear method for only 100 of 152 individuals with eggs in their feces. Specific anti-schistosome IgG antibodies were evaluated in sera by ELISA. Urine samples from the 700 individuals were tested by FDA for detection of the circulating antigen. The assay showed a sensitivity of 93% among 433 infected individuals and a specificity of 89% among 267 noninfected individuals. FDA showed the highest efficiency of antigen detection (91%) compared with the efficiency of antibody detection by ELISA (75%) and stool analysis (60%). In addition, FDA detected infected patients with 20 eggs/g of feces. Also, the sensitivity of FDA ranged from 90 to 94% among samples from patients with different clinical stages of schistosomiasis. All the assay steps can be completed within 30 min at room temperature for 96 urine samples. The monoclonal antibody identified a 74-kDa antigen in different antigenic extracts of S. mansoni and Schistosoma haematobium and in the urine of infected individuals. In addition, a 30-kDa degradation product was identified only in the urine samples. On the basis of these results, FDA should be used as a rapid tool for the sensitive and specific diagnosis of Schistosoma infection.     

Bronchopulmonary dysplasia. Impact of surfactant replacement therapy

Many functional dyspepsia treatment trials have until recently suffered from important weaknesses in study design. A major problem has been the low number of studies that have used validated outcome measures. Fortunately, progress has been made in this area. The evidence for the efficacy of antacids, H2-receptor antagonists, omeprazole, domperidone, cisapride and anti-Helicobacter therapy is reviewed. Although several of these have shown benefit, it is unclear whether this may be a result of the inclusion of patients with unrecognized gastro-oesophageal reflux disease. The data on anti-Helicobacter therapy are conflicting.     

Increased density of microtubule associated protein 2-immunoreactive neurons in the prefrontal white matter of schizophrenic subjects

Recent studies have suggested that schizophrenia may be related to prenatal disturbances in the cortical subplate, a transient but essential structure in the formation of cerebral cortical circuitry. Although most subplate neurons die during later development, some remain as the interstitial neurons of the adult white matter. In this study we used a monoclonal antibody against the cytoskeletal protein, microtubule associated protein-2 (MAP2), to quantify the density and distribution of labeled neurons in postmortem brain specimens containing the prefrontal white matter from five schizophrenic cases and matched controls. In both schizophrenics and matched controls, the density of white matter neurons decreased with increasing white matter depth. However, the mean density of MAP2-immunoreactive neurons was greater in the superficial white matter of the schizophrenic subjects compared to the matched controls. In contrast, no difference in the density of labeled neurons was seen in the deeper white matter. These findings are consistent with an abnormality in the development of the cortical subplate in at least some cases of schizophrenia.     

Binocular stereo algorithm based on the disparity-gradient limit and using optimization theory

A new algorithm for stereo matching is presented, based on the idea of imposing a limit on disparity gradients allowed in the matched image. The matching problem will be expressed as one of maximizing a certain function, subject to constraints. Standard methods from optimization theory may then be used to find a solution.