多晶硅压力传感器

研制一种多晶硅压力传感器．它采用一氧化硅介质膜隔离代替ｐ－ｎ结隔离，提高了工作温度；通过控制掺杂浓度，改善了温度特性．实验表明，该传感器灵敏度高，工作温限高，温度漂移小．     

Identification of the Kukersite-type source rocks in the Ordovician Stratigraphy from the Tarim Basin, NW China

Due to the importance of the Gloeocapsomorpha Prisca （G. prisca）-enriched source rocks, which belong to Kukersite-type source rocks in the Lower Paleozoic Ordovician strata, it has received great attentions during the petroleum exploration as to whether there are the Kukersite-type source rocks developed in the major hydrocarbon source strata of the Upper and Middle Ordovician in the Tarim Basin. Using pyrolysis-gas chromatography-mass spectrography to analyse kerogens from source rocks in the lime- mud mound with moderate maturity, study reveals that there are the Kukersite-type source rocks in the Ordovician strata of the Tarim Basin. The pyrolysis products showed a low content of 〉n-C19 normal alkanes with a significant odd-even predominance between n-C13 and n-Cl7, long-chain alky substituted alkylbenzene and alkylthiophene isomers and distinctive distribution of 5-N- alkyl-1, 3-Benzenediol and its homologous. Based on the geographic environment characteristics of G. Prisca, the molecular dis- tributions of crude oil from the Lower Paleozoic petroleum systems in the Tarim Basin and characteristics of kerogen pyrolysis products from the Middle and Upper Ordovician source rocks, the results suggested that it is less possible to develop the G. Pris- ca-enriched Kukersite-type source rocks in the major hydrocarbon source rocks in the Middle and Upper Ordovician strata in the Tarim Basin. However, the benthic macroalga and planktonic algae-enriched source rocks are the main contributors.     

一类离散不确定脉冲切换系统的H∞输出反馈控制

讨论了一类离散不确定脉冲切换系统的H∞输出反馈控制问题,该系统的状态矩阵和控制矩阵都带有不确定性和扰动,利用H∞控制理论和Lyapunov方法,给出了系统具有γ鲁棒性能的充分条件.     

分级变频的转矩平滑上升软起动器

采用基于恒压频比的分级变频方法,通过有规律地开通或者关断工频电源,获得可调的电压频率和幅值.分频后的三相电压组合很多,为了获得平滑上升且足够大的起动转矩,采用傅里叶变换提取上述电压组合中的基波电压的幅值和初始相位,按照恒压频比策略进行控制,然后逐步提高频率并起动电机,进行仿真并搭建基于单片机的实验电路.主电路由3对反并...     

Comparative proteomics analysis of <Emphasis Type="Italic">OsNAS1</Emphasis> transgenic <Emphasis Type="Italic">Brassica napus</Emphasis> under salt stress

Salt stress is one of the major abiotic stresses in agricultural plants worldwide. We used proteomics to analyze the differential expression of proteins in transgenic OsNAS1 and non-transformant Brassica napus treated with 20 mmol/L Na₂CO₃. Total protein from the leaves was extracted and separated through a high-resolution and highly repetitive two-dimensional electrophoresis (2-DE) technology system. Twelve protein spots were reproducibly observed to be upregulated by more than 2-fold between transgenic and non-transformant B. napus. These 12 spots were digested in-gel with trypsin and characterized by matrix-assisted laser-desorption/ionization time-of-flight mass spectrometry (MALDI-TOF-MS) to obtain the peptide mass fingerprints. Protein database searching revealed that 5 of these proteins are involved in salt tolerance: dehydrogenase, glutathione S-transferase, peroxidase, 20S proteasome beta subunit, and ribulose-1,5-bisphosphate carboxylase/oxygenase. The potential functions of these identified proteins in substance and energy metabolism, stress tolerance, protein degradation, and cell defense are discussed. The salt tolerance of the transgenic rapeseed was significantly improved by the introduction of the OsNAS1 gene from Brazilian upland rice of Oryza sativa (cv. IAPAR 9).     

氟苯尼考在两种鳗鲡体内残留及消除规律的研究

研究了氟苯尼考在日本鳗鲡和欧洲鳗鲡体内的残留消除规律.在25 ℃下,以30 mg/kg的剂量多次口灌给药后1、2、3、5、8、12、20、30 d,取鳗鲡的血浆和肌肉、肝脏、肾脏等样品,加入内标氯霉素混合,经萃取过滤后采用反相高效液相色谱法检测,测定的平均回收率在97.8%～101.3%之间,日内变异系数为(3.23±...     

交际范式构念下英语“新语法观”的理论接口及实践探索

本文主要从交际范式构念下大学英语语法技能教学实践模式出发,为英语"新语法观"教学技能找到理论接口,并提出其教学技能模式,对英语教师在英语语法技能教学中给予较为合理的支架,同时也为大学英语语法技能课堂教学改革提供坚实理论和实践依据。     

乳酸酯的合成研究

报道了合成乳酸酯的新方法，即以乳酸和醇为原料，在对甲苯磺酸催化下以氧化钙为脱水剂，采用索氏提取器进行回流脱水合成乳酸酯．应用该方法，酯化反应时间缩短到３ｈ，收率高达８１％～９８％．同时对影响收率诸因素进行了考察，最佳反应条件为乳酸醇对甲苯磺酸的摩尔比为２４２０１     

贵州黎平县亮叶含笑群落研究

本文通过调查、分析黎平县高场村亮叶含笑天然群落的物种组成、外貌特征和结构特征,计测了乔木层的物种多样性.结果表明,黎平县高场村天然亮叶含笑群落植物共有26科40属47种;群落垂直结构明显,分为乔木层、灌木层、草本层和层间植物;群落的物种多样性指数较高,物种丰富;亮叶含笑在群落中处于优势种地位;群落结构趋于稳定.