ASP.NET上传图片

在Web应用程序开发的过程中,经常需要上传图片,以ASP.NE开发平台为例,详细介绍了两种常见的上传图片的方式,并对比了每种方法的优劣,对于实际应用有一定的借鉴意义。     

A non-contact graphene surface scattering rate characterization method at microwave frequency by combining Raman spectroscopy and coaxial connectors measurement

A non-contact method is proposed to characterize graphene at microwave frequency by combining Raman spectroscopy and Amphenol Precision Connector (APC-7). The CVD-grown graphene is transferred to the ring-shape Teflon substrate and characterized by Raman spectroscopy to estimate its doping density and the related Fermi energy. The graphene is then sandwiched between two APC-7 coaxial connectors and S parameters under transverse electromagnetic (TEM) mode normal incident waves are measured to extract the surface conductivity through transmission matrix, in which the de-embedding process can be avoided. By combing the Kubo formula with our proposed circuit model, the scattering rate of graphene on Teflon substrate is obtained and analyzed.     

漏磁检测技术在新疆某油田的应用

长输管道长期埋在地下,随着时间的推移,会发生腐蚀、穿孔和泄露等,对环境造成污染,甚至引起突发的灾难事故,危及人身安全,因此,急需进行腐蚀检测。腐蚀内检测技术由于其直观性、准确性和快捷性得到了快速的发展。介绍了目前国内外最常见最实用的漏磁内检测技术的原理、检测系统的组成及其在新疆某油田输气管道的应用。以期对今后的检测工作起到总结和指导作用。     

A reliable and sensitive time-resolved fluorescent immunochromatographic assay (TRFICA) for ochratoxin A in agro-products

Immunochromatographic assays (ICAs) are considered as a suitable diagnostic tool for the detection of mycotoxins. Mycotoxins and especially, ochratoxin A are analytes with more demanding sensitivity requirements. To enhance the sensitivity of current immunochromatographic assays for ochratoxin A (OTA), a novel sensitive ICA was developed in this study. In the assay, microspheres enclosing fluorescent europium (III) [Eu(III)] nanoparticles (EuNPs) were used as a label for OTA monoclonal antibody (OTA-mAb) conjugation. Accordingly, assay was called time-resolved fluorescent immunochromatographic assay (TRFICA). The test strip was composed of three parts: a sample pad, nitrocellulose membrane and an absorbent pad. As for detection, a proper concentration of conjugated microspheres was pipetted into the microtube and sample extract was added to it. Then the strip was inserted into the tube and the fluid flow along the strip. The TRFICA results were obtained in 8 min and read by a portable TRFICA strip reader. The established method allows quantitative determination of OTA with limit of detection as low as 1.0 μg kg⁻¹ in the samples. For validation, spiked samples including wheat, maize, soybean and rice were respectively assayed by TRFICA and a standard high performance liquid chromatography equipped with a fluorescence detector (HPLC-FLD), and good agreement of results was obtained between two methods.     

Influence of Cu on the mechanical and tribological properties of Ti3SiC2

Ti₃SiC₂/Cu composites with different contents of Cu were fabricated by mechanical alloying and spark plasma sintering method. The phase composition and structure of the composites were analyzed by X-ray diffractometry and scanning electron microscopy equipped with energy dispersive spectroscopy. The mechanical and tribological properties of Ti₃SiC₂/Cu composites were tested and analyzed compared with monolithic Ti₃SiC₂ in details. The results show that the Cu leads to the decomposition of Ti₃SiC₂ to produce TiC_x, Ti₅Si₃C_y, Cu₃Si, and TiSi₂C_z. The friction coefficient and wear rate of the composites are lower than that of monolithic Ti₃SiC₂, which is ascribed to the fixing effect of hard TiC_x, Ti₅Si₃C_y, and Cu₃Si to inhibit the abrasive friction and wear. However, at elevated temperatures (ranging from room temperature to 600 °C) the friction and wear of the composites are higher than those at room temperature. Plastic flowing and tribo-oxidation wear accompanied by material transference contribute to the increased friction and wear at elevated temperatures.     

地矿三维建模及可视化的研究

地矿三维建模及其三维可视化对地质、矿藏信息的获取及地质现象解释具有十分重要的意义。采用基于TIN的多层DEM方法，实现层状地矿实体模型的三维重构，借助于OpenGL图形库实现了层状实体模型的三维可视化，并对模型进行了光照渲染、漫游和切割等操作。     

东营凹陷和高邮凹陷古近系沉积特征对比研究

东营凹陷和高邮凹陷分属渤海湾盆地与苏北盆地，是中国东部中、新生代陆相断陷盆地中的典型凹陷，无论从构造角度、沉积特征还是从石油地质条件，都具有颇为重要的代表意义。因此，本文立足沉积学理论的基本观点，综合利用前人研究成果，以构造区带为单元，以构造与沉积演化为主线，以沉积相时空展布为内容。以沉积充填特征为核心，采用逐一对比的方法，总结出东营凹陷与高邮凹陷古近系构造格局与沉积格局“整体上类似、局部上差异”的根本性原因及其控制因素。     

β-环糊精对曲拉通X-114紫外光谱抗干扰性能的影响

辛基苯基聚氧乙烯醚（曲拉通X-114）和脂肪醇聚氧乙烯醚（AEO-9）之间的相互作用能对水溶液中曲拉通X-114的紫外光谱产生明显影响。实验结果表明,在200～350nm范围内,曲拉通X-114的最大吸收波长为223nm,AEO-9的紫外吸光度接近于0;在水溶液中,AEO-9能减弱曲拉通X-114的紫外吸光度,降幅达3.4%;AEO-9还能显著降低曲拉通X-114的表观临界胶束浓度（cmc）,当AEO-9的浓度从0增加到0.050mmol/L 和0.100mmol/L时,曲拉通X-114的表观cmc从0.219mmol/L分别降至0.207mmol/L和0.202mmol/L。实验结果进一步表明,β-环糊精（β-CD）能有效降低AEO-9对曲拉通X-114的紫外吸光度及表观cmc的影响,在曲拉通 X-114和AEO-9复配水溶液中,按物质的量比1∶1加入β-CD,复配水溶液中曲拉通X-114的回收率从95.8%～103.3%变化至99.0%～100.1%,表明了β-CD能明显降低AEO-9对曲拉通X-114的干扰作用。红外光谱表征结果（FTIR）、核磁共振氢谱表征（¹H NMR）及热重差热分析表征结果（TG-DSC）表明,曲拉通X-114进入β-CD 分子空腔并形成包结物,是阻断曲拉通X-114分子形成混合胶束以及消除AEO对曲拉通X-114的干扰的主要原因。     

化学反应工程课程教学改革初探

化学反应工程是化工类学生的专业核心课,对培养学生的化学工程基础、强化工程分析能力具有十分重要的作用。针对化学反应工程课程的特点和教学现状,从教学内容的选取、教学手段、教学方法和考核方式四个方面进行了有益的教学改革,提高了学生学习的兴趣,取得了较好的教学效果。     

超声波对表面活性剂溶液的作用试验

通过试验研究了超声波对脂肪醇聚氧乙烯醚硫酸钠(AES)和聚山梨酯-80(Tween-80)溶液表面张力系数的影响,测量了AES溶液化学需氧量的变化。得到:掺入AES和Tween-80表面活性剂后,水的表面张力系数显著降低了,表面活性剂的浓度越大,其表面张力越小。表面活性剂溶液经超声波处理后:表面张力系数有一定的上升,超声波功率越大、作用时间越长,表面张力系数上升越大;随着超声波作用时间的增加,AES溶液的化学需氧量越来越小,但随作用时间的增加,下降的趋势变慢。