基于双DSP及VI技术的无线测控系统设计

针对工业测控的现状和需求,提出一种新型测控方案,并对其关键技术进行了研究。系统采用双DSP工作模式,并在此基础上提出了并行FFT算法,实现了双余度数据采集及处理,提高了数据处理效率;采用RS 485无线通信方式实现数据和控制信号收发;上位机端基于LabVIEW开发平台实现了信号收发,并提供ODBC数据库接口,将虚拟仪器技术和面向Internet的Web技术有机结合起来,很好地满足了监测系统互联和资源共享的需求。     

多正极混合型超级电容器的研制

通过结构优化组合,采用铝化成箔(Al/Al2O3)极片为正极,活性炭极片(AC/Al)为负极,研制了电压为16V的多正极混合超级电容器。通过增加正极数量,进一步提高能量密度。多项电化学性能测试显示:多正极混合超级电容器具有快速充放电能力,与1000μF铝电解电容器相比,能量密度提高了约9倍,阻抗曲线接近理想电容器,内阻约为0.05?。     

Self-inhibition in amiloride-sensitive sodium channels in taste receptor cells

Recognition of antigen by T cells requires the formation of a specialized junction between the T cell and the antigen-presenting cell. This junction is generated by the recruitment and the exclusion of specific proteins from the contact area. The mechanisms that regulate these events are unknown. Here we demonstrate that ligand engagement of the adhesion molecule, CD2, initiates a process of protein segregation, CD2 clustering, and cytoskeletal polarization. Although protein segregation was not dependent on the cytoplasmic domain of CD2, CD2 clustering and cytoskeletal polarization required an interaction of the CD2 cytoplasmic domain with a novel SH3-containing protein. This novel protein, called CD2AP, is likely to facilitate receptor patterning in the contact area by linking specific adhesion receptors to the cytoskeleton.     

Loss of H19 imprinting and up-regulation of H19 and SNRPN in a case with malignant mixed Müllerian tumor of the uterus

An unusual clinical presentation of a patient with neuronal intestinal dysplasia is presented. A 46-year-old male noted a palpable mass in the right lower quadrant of his abdomen for two months. A computed axial tomographic scan showed a thickened wall of the cecum with a tumor-like appearance. The excised specimen consisted of a mass caused by the thickened, edematous wall of the dilated cecum and appendix. The wall of the cecum and appendix measured up to 2.5 and 0.8 cm, respectively, in thickness. Microscopic studies showed extensive hyperplasia and hypertrophy of the ganglia and nerve plexuses and hypertrophy of the muscularis propria, consistent with neuronal intestinal dysplasia.     

不同比例LA/ALA对HepG2细胞炎症因子的影响

选取植物油中典型的多不饱和脂肪酸亚油酸(LA)和α-亚麻酸(ALA)为原料,分为7个不同摩尔浓度配比实验组(组1,LA;组2,10∶1 LA/ALA;组3,5∶1 LA/ALA;组4,1∶1 LA/ALA;组5,1∶5 LA/ALA;组6,1∶10 LA/ALA;组7,ALA)体外评估不同比例n-6/n-3 PUFAs对HepG2细胞炎症因子的影响。结果表明:60μmol/L各实验组均可降低HepG2细胞产生的促炎因子TNF-α和IL-6水平,提高抗炎因子IL-10和抗炎介质LXA4水平,其中组4(1∶1 LA/ALA)作用最显著。     

浅谈新建本科院校化学类实验教学质量的保障

为确保化学类专业实验教学质量,实现新建本科院校培养高级应用型人才的培养目标,构建了一套化学类专业实验教学质量保障体系,并在实践中取得了良好的成效。     

Molasses and air blown coal tar pitch binders for the production of metallurgical quality formed coke from anthracite fines or coke breeze

The effect of the type and the amount of hardeners, such as ammonium nitrate, ammonium carbonate and nitric acid on the molasses bonded briquettes prepared from anthracite fines or coke breeze were investigated. Amongst the hardener studied the best results were obtained with 2.5% ammonium nitrate hardener. The briquettes produced with this hardener were highly water resistant but not waterproof and their tensile strengths were not adequate to be used as a substitute for the metallurgical coke. Therefore, the briquettes were prepared with molasses containing 2.5% ammonium nitrate hardener and air blown coal tar pitch blended binder. When the blended binder was used for the production of anthracite fines or coke breeze briquettes, after curing at 200 °C for 2 h, they became waterproof and their tensile strengths were found to be sufficient to be used as a substitute for coke oven coke. The briquettes after curing could be directly charged into the blast furnace without carbonizing them at high carbonization temperatures. Since molasses and coal tar pitch, are relatively cheap and readily available materials, the process investigated could be economical way of producing high quality formed coke.     

The influence of annealing on the crystallization and tribological behavior of MWNT/PEEK nanocomposites

In this study, annealing influence on crystallization and scratch behavior of neat and multi‐wall carbon nanotube (MWNT) reinforced poly(ether ether ketone) (PEEK) nanocomposites have been investigated. Crystallization behavior of normal and annealed samples was investigated by using differential scanning calorimeter (DSC). Scratch behavior of normal and annealed samples was investigated by using micro scratch tester. In DSC analysis, it was detected that, melting enthalpy of annealed neat PEEK was increased sharply when compared to neat PEEK. Melting enthalpies of annealed PEEK nanocomposites prepared with addition of up to 1 wt% MWNT were increased with a decreased trend. However, nanocomposites with higher contents of MWNTs (>1 wt%) were dramatically affected by annealing process and melting enthalpy decreased sharply. Friction coefficient values of “annealed MWNT reinforced PEEK composites” were found to be lower than “normal PEEK composites.” Annealing process affects scratch hardness of both annealed and MWNT reinforced PEEK. Annealed nanocomposites with various MWNT concentrations showed higher scratch hardness values than normal PEEK nanocomposites. POLYM. COMPOS., 2011. © 2011 Society of Plastics Engineers     

基于信息检索课的大学生信息检索行为调查研究

信息检索课程的系统化讲授,对于大学生优化信息检索行为,提高信息检索使用效率具有不容忽视的教学辅助作用.立足问卷调查形成的一系列相关数据,探讨大学生信息检索行为存在问题,最终在课程教学中提出优化大学生信息检索的对策:明确信息检索目的,提升实施效果;有效提升检索行为实施频率,增强综合质量;使得信息获取多元发展,优化成效凸显...     

天然气加热炉的腐蚀原因及防护对策

天然气加热炉的腐蚀是一个普遍现象.本文从引起腐蚀的因素人手,详细剖析腐蚀发生的原因,提出监测和治理相结合的方法,系统地介绍了几种常用的防腐技术,包括添加缓蚀剂、使用耐腐蚀材料、界面涂层、电化学防腐及其它相关防腐技术.