温室气体氧化亚氮排放源的研究

N2O是一种重要的温室效应气体，不仅具有很强的温室效应，而且参与大气对流层和平流层的许多光化学反应，因而在全球变化研究中受到广泛关注。本文对大气N2O的排放源的最新研究进展进行了综述。大气N2O的排放源包括自然源和人为源。自然源包括海洋、森林、草地等，人为源包括生物质燃烧及工业排放。土壤N2O排放约占全球N2O排放60％左右，因此，土壤是重要的N2O排放源。     

电动汽车能量源的现状与发展

电动汽车对其能量源有着比较高的要求，能量源是制约电动汽车发展的重要因素之一。分析了电动汽车能量源的发展现状，比较了各种电动汽车能量源的工作原理与特点，展望了电动汽车能量源的发展前景。     

对小学教师压力影响源的研究

教师职业压力的形成是一个动态的心理过程。教师职业压力的形成源于职业压力源的存在。职业压力源的存在会引起教师对它们的理解和评价，不同的教师对职业压力源的认知评价也不同。教师经过对职业压力源的认知评价后，形成了对职业压力源的个人理解，从而采取相应的应对措施来减轻压力源带来的消极影响。     

试论校园网“软网源”建设的若干原则

文章给出了“软网源”的定义，阐述了校园网中软网源建设的重要性，充分分析了校园网中软网源建设各个方向的成因、作用及意义，并就软网源所涉及到的人为因素等方面作出了探讨。     

电压源与电流源等效变换的内耗分析

电压源与电流源等效变换的内耗分析李文祥电压源与电流源是两种互对偶的电路模型．在电路理论分析中，已利用二者的等效变换形成了一种很方便的解题方法。用这种方法借以化简电路的基本思路是，运用了逐步“合并同类项”的办法，即电压源相串时可以合并，电流源相并时可以...     

魏源后裔探究

文章介绍了魏源的子系后裔和女系后裔的概况，提供了探究魏源后裔的信息，对于深入研究魏源与魏源思想具有重要意义。     

C源、N源含量对水稻纹枯病菌生长的影响

采用二因素最优化设计方案，研究了培养基中C源、N源含量对水稻纹枯病菌生长的影响。结果表明在实验范围内[C源(淀粉)含量：5～55mg／mL，氮源(天冬酰胺)含量：0．05～3．95mg／mL]，N源对菌丝的生长、菌核鲜重及粒数的影响大于C源。根据综合分析，培养基中的C源和N源分别以45～47．5mg／mL及2．78～3．17mg／mL的组配对水稻纹枯病菌生长较为有利。     

基于WebGIS的税务征管动态监控系统的开发与应用

本文针对目前税收中税收户源管理中户源位置变化性大，不易控管的难题，结合WEB和GIS技术，对此类问题进行了研究，并提出了技术解决方案，实现对税源户管直观、全面、动态和高效的管理。     

关于海南黎族族源的研究

有关海南黎族的族源，总的来说有三种意见，即南来说、北来说以及两源和多源说。海南黎族的主体渊源于岭南土著古越族的一支骆越。最新的考古资料证明，她是海南岛最早的土著居民。在长期的历史发展过程中，她以民族融合的形式先后吸收过汉族、壮族、回族、正马来人乃至矮黑人(Pygmy)等多民族和种族的因素，是个一源多流的融合体。在族源问题上，不存在南来、北来以及两源和多源。     

对比法在<电工基础>教学中的应用

一、用对比法讲授新课《电工基础》学习难度较大，我在备课时对讲授方法进行了设计，常采用对比法。如在讲授电压源与电流源时，学生对电压源比较熟悉，觉得电流源不好理解。于是，我从两种电源在生产中的实例、物理模型、教学模型及各自特点一一加以对比。在对比中指出其相似和不同点，再进一步说明两种模型等效的原理，互换的条件。并提醒大家注意在互换中及以后的网络分析中分清理想电源和实际电源，注意与电压源并联的电阻及与电流源串联的电阻在什么条件下不予考虑，并各以一例来说明这些电阻对外部电路没有影响等等。在交流电路的分析…     

Validation of the use of foreign gas rebreathing method for non-invasive determination of cardiac output in heart disease patients

INTRODUCTION In the arsenal of cardiac functional parameters,cardiac output(CO),cardiac index(CI),and strokevolume(SV)are potentially important determinantsof hemodynamics,the measurement of which relieson complicated and sometimes invasive techniques.In the case of congestive heart failure,non-invasivemethods to provide accurate measures of these pa-rameters during exercise stress testing would addsignificant objectiveness to the test result.This couldbe of considerable importance for …     

Comparison of computed tomography and chest radiography in the detection of rib fractures in abused infants

PURPOSE: Chest radiographs (CXR) are the standard method for evaluating rib fractures in abused infants. Computed tomography (CT) is a sensitive method to detect rib fractures. The purpose of this study was to compare CT and CXR in the evaluation of rib fractures in abused infants. METHODS: This retrospective study included all 12 abused infants identified from 1999 to 2004 who had rib fractures and both CXR and CT (8 abdomen CTs, 4 chest CTs). CT exams had been performed for clinical indications, and were obtained within one day of the CXR. Studies were reviewed by two pediatric radiologists to determine the number, locations, and approximate ages of the rib fractures. A total of 225 ribs were completely (192) or partially (33) seen by CT, and the matched ribs on CXR were used for the analysis. RESULTS: The mean patient age was 2.5 months (1.2-5.6), with seven females and five males. While 131 fractures were visualized by CT, only 79 were seen by CXR (p<.001). One patient had fractures only seen by CT. There were significantly (p<.05) more early subacute (24 vs. 4), subacute (47 vs. 26), and old fractures (4 vs. 0) seen by CT than by CXR. Anterior (42 vs. 11), anterolateral (21 vs. 12), posterolateral (9 vs. 3) and posterior (39 vs. 24) fractures were better seen by CT than by CXR (p<.01). Bilateral fractures were detected more often by CT (11) than by CXR (6). CONCLUSIONS: While this study group is small, these findings suggest that CT is better than CXR in visualizing rib fractures in abused infants.     

论英汉长句的译法

本结合典型实例从理论和实践的角度论述英汉长句的主要译法：1．顺序法；2．逆序法；3．调整顺序法；4．分译法；5．综合法。这些译法建立在英汉两种语言的共性，特性及其习惯表达法的基础上。     

郑芝龙投明降清原因析论

郑芝龙生逢明末清初朝供更替的乱世，他先以海盗而投明，又以明之国公而降清，究其原因，不外以下几点：（1）传统观念的影响；（2）利益所驱；（3）人心世风的引导；（4）朝廷措置得当。值得特别指出的是：降清与郑芝个人的异域生活经历有相当大的关系。     

两种方法提取白茶中挥发性化学成分研究

报道了用固相微萃取法（ SPME）和水蒸汽蒸馏萃取法（ DE）提取白茶中挥发性物质,并用气相色谱-质谱联用方法对其挥发性化学成分进行分析．固相微萃取法分离并确定出35种化学成分,其中主要化学成分为苯甲醛（5．91％）﹑苯乙醇（5．46％）和芳樟醇（9．02％）．水蒸汽蒸馏萃取法分离并确定出39种化学成分,其中主要化学成分为苯甲醇（5．56％）﹑苯乙醇（8．22％）和芳樟醇（5．69％）．     

藏红花挥发性化学成分的气相色谱-质谱分析

通过分析藏红花挥发性化学成分,为藏红花的开发利用提供科学依据．采用同时蒸馏-萃取法提取藏红花挥发油,用气相色谱法分离,质谱法鉴定结构．结果表明藏红花挥发油的含量为4．30％,鉴定出46种化学成分,其中烯烃、烯烃氧化物及酸类化合物含量较高．     

Determination of the volatile fraction of coal tar

The coal tar was qualitative and quantitative anMyzed by gas chromatography （GC） method. 74 components were identified exactly by gas chromatographY-mass spectrometry （GC-MS）. 31 components （37%） were quantitatively analyzed by gas chromatography-flame ionization detector （GC-FID）. The linearity, accuracy, precision, limit of detection （LOD） and limit of quantitative （LOQ） determination were inspected. The scope of quantitative analysis by CC was discussed. The experimental results of thermogravimetric analysis （TGA） proved that GC quantitative analysis of the coal tar was reliable.     

Active changes of lignification-related enzymes in pepper response to Glomus intraradices and/or Phytophthora capsici

INTRODUCTION Plants have defense mechanisms against patho-gen infection by inducing systemic resistance in re-sponse to localized pretreatment with biological cotrol agents, thus making them resistant to subsequpathogen infection (Caruso et al., 1999; Hammschmidt, 1999; Mohammadi and Kazemi, 2002; yada et al., 1995; Pozo et al., 2002; Ray et al., 199Biological control of plant pathogens has receivmuch more attention. It is well known that plants amicroorganisms symbiosis is a defense m…     

Lymphotactin enhances the in-vitro immune efficacy of dendritoma formed by dendritic cells and mouse hepatocellular carcinoma cells

Objective: To investigate the in-vitro antitumor immune responses of dendritoma formed by mouse hepatocellular carcinoma (HCC) cells and lymphotactin (Lptn) gene modified dendritic cells (DCs). Method: DCs prepared from mouse bone marrow were genetically modified by lymphotactin adenovirus, and fused with H22 cells by polyethylene glycol (PEG). RT-PCR and ELISA were employed to identify lymphotactin expression at mRNA and protein level. Cell phenotypes and fusion efficiency was detected by FACS. The stimulatory effect of DC on T cells was detected by mixed lymphocyte reaction. The cytotoxicity activity against H22 cells was assayed by LDH method. Results: Lymphotactin could be efficiently expressed by DCLptn/H22 hybridoma. DCLptn/H22 cells could induce potent T cell proliferation effect and generate strong cytotoxic T lymphocyte (CTL) reaction against allogenic H22 cells. Conclusion: Lymphotactin genetic modification could enhance the in vitro immune activity of the dendritoma.     

Differences of math anxiety groups based on two measurements,MASS and EEG

This article investigated how mathematic anxiety (MA) of Korean middle school students could be reduced by comparing analytically their cognitive neuroscience and questionnaire results. We developed a three-hour Complex Treatment Program (CTP) on quadratic functions for the study. In the summer of 2016, we collected data of the pre and post MA questionnaires by Mathematics Anxiety Scale for Students (MASS), the percent of correct answers (PCA) and reaction time (RT) by E-prime program, and also brain-imaging data of the event related potentials (ERP) by Electroencephalograph (EEG) using computer-based functional F-G model. The result indicated the CTP to be effective with the group with higher math anxiety and the group with higher achievement respectively. The MASS result was verified with the better performance of PCA on type G, which was measured by E-prime program. Some interesting patterns were revealed on brain-imaging data by EEG, indicating more brain activities with the MA groups.