Preparation of catalyst for a polymer electrolyte fuel cell using a novel spherical carbon support

In this study, the support Pt catalyst was supported by a novel spherical carbon using a convenient technique. Two different preparation methods utilizing a nanocolloidal solution method without heat treatment were developed (methods 1 and 2). The scanning electron microscope (SEM) and transmission electron microscope (TEM) observations showed that the Pt nanoparticles (particle size) were supported, with higher dispersion being achieved with method 2 than method 1. The peak of the Pt metal was confirmed from the X-ray diffraction (XRD) measurement. Based on the inductively coupled plasma mass spectrometry (ICP-MS) measurements, Pt loading was 19.5 wt.% in method 1 and approximately 50 wt.% in method 2. The Pt specific surface area of the Pt/novel spherical carbon catalyst calculated from the cyclic voltammetry (CV) measurement result was larger than that of the commercially available Pt/Ketjen catalyst. These results indicated that the Pt nanoparticles were supported in high dispersion without heat treatment using novel spherical carbon as a carbon support.     

采用CBL技术改造中原乙烯BA-101炉

采用CBL气体裂解技术对中原乙烯原BA-101(SRT-Ⅳ-HS)型炉进行了改造。改造后裂解炉辐射段炉管构型更新为适应裂解气体原料的辐射炉管,操作条件改善,运行周期大幅延长达144天。改造投资省,效果好,各项指标达到或超过设计值,给企业带来良好的经济效益。     

光学透镜的高精度定心无变形胶合技术

介绍了一种光学透镜胶合的高精度定心和面形无变形技术的原理、方法及工艺特点。     

纳米三氧化二砷磁性脂质体的热化疗作用对卵巢癌细胞nm23H1及c-myc的影响

为了研究纳米三氧化二砷磁性脂质体(NMLA)的热化疗作用对卵巢癌HO-8910细胞nm23H1和c-myc mRNA表达有无影响。以培养液做对照,分别将空白脂质体、三氧化二砷(As2O3)溶液、纳米As2O3脂质体、纳米磁性脂质体(NML)、NMLA作用于人浆液性卵巢癌HO-8910细胞,并用高频交变磁场(AMF)对经过NML和NMLA处理的HO-8910细胞作进一步热疗处理,RT-PCR方法检测各组细胞nm23H1和c-myc的mRNA表达情况。实验发现,As2O3使nm23H1mRNA的表达上调,热疗对其无影响;单纯As2O3及热疗均使c-mycmRNA的表达下调,纳米As2O3磁性脂质体的热化疗对其下调作用更为显著。上述结果表明,NMLA可在高频AMF作用下对卵巢癌细胞进行热化疗,机制与nm23H1和c-myc的表达相关。     

Phase appearance during polymerization of fluorinated polyimide monomers and deposition into the microscopic‐scale trenches in supercritical carbon dioxide

The phase appearance during the synthesis of fluorinated polyamic acid (PAA) from 2,2‐bis(3,4‐anhydrodicarboxyphenyl)‐hexafluoropropane (6FDA) and 2,2′‐bis(trifluoromethyl)?4,4′‐diaminobiphenyl (TFDB) in supercritical carbon dioxide (scCO₂) was investigated to obtain fundamental data for the deposition of fluorinate polyimides (PI) using scCO₂. All polymerizations were carried out at 30 MPa for 60 min. The experimental temperatures ranged from 50 to 70 °C, and each of the monomer concentrations ranged from 0.67 × 10^?5 to 3.3 × 10^?5 mol cm^?3. The holding time of the transparent phases, which was the time from the beginning of the polymerization to the appearance of a turbid phase, was increased with either a decrease in the polymerization temperature or a decrease in the initial monomer concentration. The holding time of the fluorinated PAA was longer than that of the monomers of Kapton‐type PAA. The deposition of PI into the microscopic‐scale trenches that had formed on the silicon wafer was successful in scCO₂. © 2016 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2016 , 133, 43334.     

Angioarchitecture and morphology of temporomandibular joint of Monodelphis domestica

The opossum Monodelphis domestica presents movement of the temporomandibular joint (TMJ) reflecting adaptation to eating habits similar to movement in humans, but the structure of the TMJ is not yet known. Thus, nine young M. domestica, of both sexes were weighed, anesthetized with xylazine (10 mg kg^?1), and ketamine (70 mg kg^?1) and processed for: 1. The analyses of the macroscopic angioarchitecture after latex injection, as well as the topography of the TMJ; 2. The analysis of microvascularization after injection of Mercox resin and corrosion of soft tissue with NaOH using scanning electron microscopy and; 3. The histological evaluation of the TMJ with an optical microscope. Macroscopic analysis of the latex injected vessels revealed the distribution of the arteries from the common carotid artery, receiving branches of the superficial temporal and maxillary arteries. The mandibular condyle has the long axis in the lateral–lateral direction, and is convex in the anterior–posterior direction. Its topography was determined in relation to the eye and external acoustic meatus. With scanning electron microscopy, microvascularization consists of arterioles of varying diameter (85–15 µm) of the meandering capillary network in the retrodiscal region, and a network of straight capillaries in the TMJ anterior region. Via light microscopy the TMJ has similar histological features to those of humans. These macroscopic, microscopic and ultrastructural data from TMJ of the M. domestica could be a suitable model for TMJ physiology and pathophysiology studies for then speculate on possible human studies. Microsc. Res. Tech. 79:806–813, 2016. © 2016 Wiley Periodicals, Inc.     

基于OpenGL的卫星轨道可视化技术研究

在VC 6.0环境中运用OpenGL开发实现具有交互功能的卫星轨道预测并进行三维显示.介绍了实现可视化过程所需的几个关键技术.