基于ZSSC3008的智能应变式传感器设计

针对压阻式传感器存在的零点偏差、满度偏差以及输出信号的非线性误差,提出了采用ZSSC3008传感器信号调理芯片进行补偿校准的方案;描述了传感器补偿系统的整体构架,阐述了ZSSC3008的硬件结构、应用电路设计以及对传感器的补偿过程;实验结果表明:用上位机补偿校准软件对传感器补偿后,实现了传感器的一致性以及输出信号与压力良好的线性关系,并具有操作效率高的优点。     

Proton Conducting Borosiloxane Solid Electrolytes and Their Composites with Nafion®

A variety of proton conducting borosiloxane solid electrolytes containing -SO₃H groups as proton sources were prepared. The presence of boron as a Lewis acid in the inorganic-organic hybrid structure was thought to lead to enhanced -SO₃H dissociation, while the incorporation of alkyl groups overcame the tendency of the materials towards deliquescence at high temperatures and high relative humidity. Robust films, prepared from composites of borosiloxane electrolyte and Nafion® 117, were thermally stable and exhibited superior proton conducting characteristics to Nafion® 117.     

自组装法制备Nafion117/蒙脱土复合膜

用经过处理的有机蒙脱土,以乙醇为分散剂,Nafion117膜为原料,在超声波振荡下进行自组装,制备了Nafion117/蒙脱土复合膜.采用红外光谱(FT-IR)和扫描电镜(SEM)测定了掺杂前后Nafion117膜结构的变化.结果表明,掺杂膜已经进行了自组装,蒙脱土沉积到Nafion117膜上构筑成一种特殊的复合膜.     

加速腐蚀试验方法的比较

分别采用溶剂型涂料和水性涂料体系,考察了NORSOK M-501循环腐蚀试验、ASTM B117盐雾试验、ASTM 5894循环腐蚀试验和单独的ASTM 5894盐雾试验对涂层的影响.结果表明,NORSOK M-501循环对底材的腐蚀主要足缝隙腐蚀和物理作用,而ASTM 5894循环主要是物理作用和微酸性条件下的均匀腐蚀.     

117mSn－DTPMP的制备及其生物性质研究

合成了具有亲骨性的氨基膦酸配体－DTPMP（二乙基三胺基五亚甲基膦酸）,制备了117mSn(Ⅳ)－DTPMP,对配合物的稳定性、亲脂性作了研究,考察了它在小鼠体内的分布。将其生物性质与已有文献报道的117mSn(Ⅳ)－DTPA作了比较。结果表明117mSn(Ⅳ)－DTPMP的制备方法简单,配合物稳定性好,亲水,在小鼠体内的生物行为表明117mSn(Ⅳ)－DTPMP的靶向摄取率即骨摄取率较高,高于国外文献报道的117mSn(Ⅳ)－DTPA,是一种极具潜力的新型放射性药物。     

Alpha induced reactions on Cd up to 38.5 MeV: Experimental and theoretical studies of the excitation functions

The energy dependence of the cross sections of threshold reactions induced by alpha particles on targets of natural cadmium is studied in the energy range from threshold up to 38 MeV. Using a stacked foil irradiation technique and classical gamma-spectroscopy the formation of the radioisotopes ^{110,113m+g,117m}Sn, ^{108m,g,109g,110m,g,111cum,113m,114m,115m,116m,117m,g}In and ^111m,115gCd was assessed. The newly obtained excitation functions were compared with earlier published values, measured either on enriched or natural Cd targets. The results of calculations based on theoretical models of nuclear reactions obtained by the codes ALICE-IPPE, EMPIRE and GNASH are presented. Thick target yields and production routes for some medically relevant radioisotopes are discussed.     

Development and operation of a 150 W air-feed direct methanol fuel cell stack

A five-cell 150 W air-feed direct methanol fuel cell (DMFC) stack was demonstrated. The DMFC cells employed Nafion 117^® as a solid polymer electrolyte membrane and high surface area carbon supported Pt-Ru and Pt catalysts for methanol electrooxidation and oxygen reduction, respectively. Stainless steel-based stack housing and bipolar plates were utilized. Electrodes with a 225 cm² geometrical area were manufactured by a doctor-blade technique. An average power density of about 140 mW cm^–2 was obtained at 110 °C in the presence of 1 M methanol and 3 atm air feed. A small area graphite single cell (5 cm²) based on the same membrane electrode assembly (MEA) gave a power density of 180 mW cm^–2 under similar operating conditions. This difference is ascribed to the larger internal resistance of the stack and to non-homogeneous reactant distribution. A small loss of performance was observed at high current densities after one month of discontinuous stack operation.     

The DNA Sequence of Cosmid 14–13b from Chromosome XIV of Saccharomyces cerevisiae Reveals an Unusually High Number of Overlapping Open Reading Frames

This work is part of the effort for sequencing chromosome XIV of Saccharomyces cerevisiae. Cosmid 14–13b contains a 37·8 kb insert derived from a partial Sau3A digestion of the genome, cloned into the BamHI site of the vector Pou6. The strategy used for sequencing is based on the fragmentation of the whole cosmid by sonication, followed by shotgun sequencing on an Applied Biosystem DNA sequencer. The clones with inserts corresponding to the vector were identified by dot-blot hybridization, without the need of sequencing. The analysis of the DNA sequence reveals 29 open reading frames (ORFs) longer than 300 bases. Nine ORFs are internal to some other ORFs. Similarity searches against DNA and protein data banks show that six ORFs correspond to already known yeast genes (OMP1, PSU1, MLS1, RPC19, DBP2, CYB5) and one ORF matches the sequence of a putative yeast gene (ESBP6). The cosmid sequence has been submitted to the EMBL data bank under Accession Number Z69382.©1997 John Wiley & Sons, Ltd.     

^117Sn^m-DTPMP的制备及其在小鼠体内的生物分布

合成了具有亲骨性的氨基膦酸配体二乙基三胺基五亚甲基膦酸（DTPMP）,制备了^117Sn^m（Ⅳ）-DTPMP,并研究其稳定性、亲脂性以及在小鼠体内的生物分布。结果表明,^117Sn^m（Ⅳ）-DTPMP的制备方法简单,稳定性好,亲水,标记率〉95％;在小鼠体内的生物分布表明,^117Sn^m（Ⅳ）-DTPMP的靶向摄取率即骨摄取率较高,注射1h之后达（22．26±2．02）％ID／g,是一种极具潜力的新型放射性药物。     

濮城油田复合型多段塞深部调剖技术

针对濮城油田油藏的地质特征与流体分布状况，利用不同调剖剂的不同作用空间，采用复合型多段塞对该油田的注水井进行深剖调剖。现场应用表明，该技术能扩大油藏的水驱波及体积，提高水驱动用程度，达到稳油控水的目的。该技术在濮城油田的成功应用，对其它类似油藏的开发有一定的借鉴与指导意义。