检索结果-南通市图书馆

Study of chemical forms of phosphorus and their bioavailability in the sediments

在线全文

学校读者我要写书评

暂无评论

Acta Oceanologica Sinica 2004年第2期23卷 317-327页

作者： ZHENGAirong SHENHaiwei LIWenquan DepartmentofOceanography／InstituteofSubtropicalOceanography XiamenUniversityXiamen361005China graduateschoolofOceanography UniversityofRhodeIslandNarragansett02882USA

Chemical forms of phosphorus in the sediments of the Daya Bay, the Zhujiang River estuary , and the Xiamen Bay are measured with extraction solutions of MgCl2. NaOH, and HC1. Their availabilities to Chlorella sp. and Isochrysis galbana are estimated by using sediments as the sole source of P in the bioassays. The results show that the contents of total phosphorus (TP) in these sediments are 449.3. 650.1 and 643.9 mg/kg, respectively. The contents of non-apatite inorganic P (NAIP) extracted with MgCl2.and NaOH from 3.sediments are 168.8, 146.6 and 118.1 mg/kg, respectively, and account for 18.3. -3.0}6% of TP. The phosphorus extracted with HC1 solution is greater than that extracted with NaOH solution and the lowest extracted P is MgCl2.extractable P. The greatest relative growth rates of Chlorella sp. and Isochrysis galbana cultured with sediments are in the range of 4.3. -2..9%. The increasing biomasses of these algae correspond to NAIP and AAPP (the estimated algal-available particulate P). AAPP accounts for 42.4% -78.2. of NAIP, 2..1 % - 2..1% of total inorganic P, and 11.8% - 2..3. of TP, respectively.

关键词： chemical forms phosphorus bioavailability,sediment

连续前路腰丛神经阻滞用于膝关节置换术后镇痛的临床观察

在线全文

学校读者我要写书评

暂无评论

天津医科大学学报 2009年第4期15卷 583-585页

作者：邓姗高鲁渤天津医科大学研究生院天津300070 天津市天津医院天津医科大学肿瘤医院

目的:观察不同浓度罗哌卡因连续前路腰丛神经阻滞用于全膝关节置换(TKP)术后镇痛的效果。方法:选择ASAI～Ⅱ级,择期在全身麻醉下行TKP术的患者45例,随机分为3.:静脉持续芬太尼组(A组),0.2.罗哌卡因组(B组)和0.15%罗哌卡因组(C组),每组1... 详细信息

目的:观察不同浓度罗哌卡因连续前路腰丛神经阻滞用于全膝关节置换(TKP)术后镇痛的效果。方法:选择ASAI～Ⅱ级,择期在全身麻醉下行TKP术的患者45例,随机分为3.:静脉持续芬太尼组(A组),0.2.罗哌卡因组(B组)和0.15%罗哌卡因组(C组),每组15例,所有患者均采取静吸复合全身麻醉。A组患者术后持续静脉输注芬太尼镇痛,B组和C组患者分别通过前路腰丛阻滞导管持续输注0.2.罗哌卡因和0.15%罗哌卡因镇痛。3.患者均持续镇痛50h。记录静息及被动运动时视觉模拟评分(VAS)、肌力分级、镇静程度及副作用发生情况。结果:B组和C组患者术后8、12.2.、48h静息和运动时VAS评分均明显低于A组,P3.患者肌力均良好,无统计学差异。A组患者镇静过度、恶心及镇痛不全发生率均较高。结论:0.15%或0.2.罗哌卡因连续前路腰丛神经阻滞用于全膝关节置换术后镇痛效果良好,对肌力影响小,副作用发生率低。

关键词：全膝关节置换术连续前路腰丛神经阻滞罗哌卡因术后镇痛

在线全文

学校读者我要写书评

暂无评论

矩阵推理测验中的错误类型分析

心理科学 2010年第3期33卷 663-665页

作者：李中权孔明张厚粲周仁来南京大学社会学院心理系南京210093 苏州大学医学院临床心理学研究所苏州215123 北京师范大学心理学院北京100875

计算机自动化项目生成已逐渐被用来应对矩阵推理测验曝光的问题,然而对诱选项该如何设置却没有很好的文献支持。现有与矩阵推理测验(如瑞文测验)相关的大量研究中,研究者都只使用正确作答数或者错误率,对个体所犯错误信息的深入探查较... 详细信息

计算机自动化项目生成已逐渐被用来应对矩阵推理测验曝光的问题,然而对诱选项该如何设置却没有很好的文献支持。现有与矩阵推理测验(如瑞文测验)相关的大量研究中,研究者都只使用正确作答数或者错误率,对个体所犯错误信息的深入探查较少。通过对3.0名大学生在矩阵推理测验作答时产生的错误答案的编码分析,发现可将所有被试的错误模型分成4种类型,其中出现最多的是不完整解答错误(IC),忽视项目涉及的部分规则。中高能力者的错误都集中在IC类型上,而低能力者在四种错误类型上的分布相对平均些。这一结果支持了矩阵推理测验的认知模型,也为计算机自动化项目生成的诱选项编制提供参考。

关键词：矩阵推理测验计算机自动化项目生成错误分析诱选项工作记忆

Research On Inversion For Blast Furnace Surface Distribution

在线全文

学校读者我要写书评

暂无评论

Research On Inversion For Blast Furnace Surface Distribution

Disuccinimidyl suberate cross-linked hemoglobin as a novel red blood cell substitute

第2.届中国控制与决策会议

作者： Qingwen Hou 1,2., Xianzhong Chen 1,2., Zhiwei Xu 1,2.1. {3. of Automation & Electrical Engineering, University of Science and Technology beijing, beijing 100083.0} Key Laboratory of the Ministry of Education of china for Advanced Control for Iron and Steel Process, University of Science and Technology beijing, beijing 100083

Based on the working principle of FMCW radar and features of rough material surface, a novel surface inversion method is proposed. First, CZT transform is applied to get the spectrum distribution of beat signal. Then, energy center method is used in calculation of center distance. Finally, the center distance and distance distribution are respectively used as the key interpolation points and interpolation constraints in the ultimate surface inversion process. During the simulation, the author uses MATLAB to simulate the target beat signal under different incident conditions to study the influencing factors of spectrum distribution. Experiment of the coke bulk solid measurement shows that the interpolation surface and the actual coke material surface are basically the same.

关键词： FMCW radar blast furnaces burden surface time-frequency analysis inversion interpolation.

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

Science china(Life Sciences) 2005年第1期48卷 49-60页

作者： LU Xiuling, ZHENG Chunyang, XU Yuhong & SU Zhiguo National Key Laboratory of Biochemical Engineering, Institute of Process Engineering, Chinese academy of Sciences, beijing 100080,{2. {3. of Life Science and Technology, beijing University of Chemical Technology, beijing 10002.,{2. National Key Laboratory of Biochemical Engineering Institute of Process Engineering Chinese Academy of Sciences Beijing 100080 China

Disuccinimidyl suberate (DSS) intramolecularly cross-linked hemoglobin (Hb) was developed as a novel red blood cell substitute. A multi-angle laser light scattering detector coupled with size exclusion HPLC was applied to determine the molecular weight of the modified Hb. SDS-PAGE was also used as a complement. It was proved that 83.8% of the product was intramolecularly cross-linked Hb with weight-average molecular weights (Mw) of 67.5 kD, 12. was dimeric Hb with Mw of 146.6 kD, and 4.2. was trimeric Hb with Mw of 3.6.4 kD. The tetramer structure of the cross-linked Hb was stable as shown in size-exclusion chromatography using a mobile phase containing 1 mol/L MgCI2. Analysis by LC-MS demonstrated that the reaction of DSS with Hb mainly took place between the two a subunits within a Hb molecule, resulting in stabilization of the tetramer structure. However, the cross-linking was not site-specific. The P50 of the cross-linked Hb decreased from 2..8 mmHg to 14.3.mmHg, and the Hill coefficient decreased from 2.2. to 1.41. Result of isoelectric focusing showed that the pi of DSS cross-linked Hb was in the range of 4.6-5.2. similar to that of serum albumin. The safety of DSS cross-linked Hb was favored by animal tests on rats and guinea pigs. Exchange transfusion experiment with DSS cross-linked Hb using rats as a model indicated no pressor effect or other significant side effects. The characteristics and properties of DSS cross-linked Hb were also compared with that of diaspirin cross-linked Hb reported in the literature.

关键词： hemoglobin, disuccinimidyl suberate, cross-link, red blood cell substitute.

在线全文

学校读者我要写书评

暂无评论

航空器燃烧仓内的静电特性研究

系统仿真学报 2008年第S2期20卷 401-403页

作者：李彦旭崔占忠徐立新陈曦江苏大学电气信息工程学院镇江212013 北京理工大学机电学院北京100081

在对航空器燃烧仓内火焰筒进行建模的基础上,通过仿真的方法得到了火焰筒内碳黑粒子的浓度曲线。利用燃烧仓内的荷电示意图,建立了相应的荷电数学模型,并对其进行了仿真分析,得出了碳黑粒子性质是影响燃烧仓静电特性重要因素的结论。

关键词：燃烧仓静电特性碳黑粒子数值仿真

在线全文

学校读者我要写书评

暂无评论

行驶动力学参数对RDE实验结果的影响研究

汽车工程 2018年第4期40卷 389-395,442页

作者：宋彬葛蕴珊尹航杨正军王欣谭建伟北京理工大学机械与车辆学院北京100081 北京电动车辆协同创新中心北京100081 中国环境科学研究院北京100012

为更有效控制机动车的实际道路排放,轻型车国六法规中规定了实际行驶排放(RDE)的实验要求。由于没有固定的驾驶循环,道路交通状况和驾驶员的驾驶行为对RDE实验结果有重要影响,进而影响对车辆实际排放的客观评价。本文选择典型车辆研究... 详细信息

为更有效控制机动车的实际道路排放,轻型车国六法规中规定了实际行驶排放(RDE)的实验要求。由于没有固定的驾驶循环,道路交通状况和驾驶员的驾驶行为对RDE实验结果有重要影响,进而影响对车辆实际排放的客观评价。本文选择典型车辆研究了不同驾驶行为对实际道路车辆排放的影响。实验结果表明:NO_x和PN排放量与车辆的动力学参数v·a_(pos_)[95]和RPA具有明显的相关性,而CO排放量与车辆动力学参数之间的相关性不明显。市区工况下,NO_x排放量随动力学参数v·a_(pos_)[95]的增大而增大,而PN排放量随动力学参数RPA的增加而增加;在市郊和高速工况下,NO_x排放量与动力学参数RPA有较强的相关性,而PN排放量则与动力学参数v·a_(pos_)[95]和RPA都有较强的相关性。

关键词：污染物排放 RDE测试动力学参数排放法规

CAR-FOLLOWING MODEL BASED ON DRIVING BEHAVIOR AND RESEARCH ON THE STABILITY OF THE MODEL

在线全文

学校读者我要写书评

暂无评论

CAR-FOLLOWING MODEL BASED ON DRIVING BEHAVIOR AND RESEARCH O...

Consensus of Multi-Agent Systems with General Linear Dynamics and Reduced-Order Protocols

第一届交通运输工程国际学术会议

作者： Hao-Ran Zhang1 2.Wei Wang3.and Gang Ren4 1school of Transportation Southeast University Postcode: 2.0096 Nanjing Jiangsu {3. 2.1} Highway Planning and Design Institute (HPDI) Consultants INC. Postcode:100010 beijing {3. 3.1} of Transportation Southeast University Postcode: 2.0096 Nanjing Jiangsu {3. 4school of Transportation Southeast University Postcode: 2.0096 Nanjing Jiangsu {3.

Established car-following model based on driving behavior, and look forward to be applied in traffic simulation, traffic safety and intelligent transport control. Researched on different driving behavior and established car-following model correspondingly. By analyzing the model, determined the reasonable value range of the parameters and simulated various car-following processes. The car-following model established based on driving behavior can simulate actual driving behavior precisely. The value range of parameters of car-following models established according to different driving behavior is different. Different driving behavior requires different safe headway. When the values of the parameter exceed the rational range, the corresponding car-following behavior is unsafely. We drew the conclusion by simulation of car-following motorcade: taking safe time headway as definition of safe headway is superior to using safe space headway;vehicles in fluctuant motorcade must keep longer safe headway than in stable motorcade;the accelerating or decelerating performance of vehicles has small influence to safe headway;vehicles have better accelerating performance must keep longer safe headway, and vehicle has worse decelerating performance requires longer safe headway.

关键词： traffic safety traffic simulation driving behavior car-following car-following model safe headway

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

Consensus of Multi-Agent Systems with General Linear Dynamic...