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Search Results: 1 - 10 of 58822 matches for " 董亚莹 "
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一类空间退化的捕食-食饵模型的全局分歧结构
Global bifurcation structure in a predator-prey model with a spatial degeneracy


- , 2018, DOI: 10.6040/j.issn.1671-9352.0.2017.580
Abstract: 摘要: 研究了一类空间退化异质环境中带有Holling II型反应函数的捕食-食饵模型。当食饵的生长率较弱时, 通过比较原理给出了任意正稳态解的先验估计, 再利用全局分歧理论证明了正稳态解集合形成一条有界的全局分歧曲线;当食饵的生长率较强时, 通过反证法得到了任意正稳态解的先验估计, 并利用全局分歧理论证明了正稳态解集合形成一条无界的全局分歧曲线。
Abstract: A predator-prey model with Holling type II response function in a spatially degenerate heterogeneous environment is studied. When the prey growth rate is weak, a priori estimates of any positive steady-state solution is first obtained by the comparison principle, and then we show that the set of positive steady-state solutions forms a bounded global bifurcation curve by the global bifurcation theory. When the prey growth rate is strong, a priori estimates of any positive steady-state solution is first obtained by using reduction to absurdity, and then we show that the set of positive steady-state solutions forms an unbounded global bifurcation curve by the global bifurcation theory
Hamilton-Jacobi方程的条件Lie-Bcklund对称和不变子空间
Invariant subspaces and conditional Lie-Bcklund symmetries of the Hamilton-Jacobi equation

,屈改珠
- , 2015, DOI: 1672-4291(2015)04-0006-04doi:10.15983/j.cnki.jsnu.2015.04.142
Abstract: 利用不变子空间方法和条件Lie-Bcklund对称研究Hamilton-Jacobi方程。得到方程允许的不变子空间等价于方程的高阶条件Lie-Bcklund对称。最后给出一些例子构造出Hamilton-Jacobi方程的广义泛函分离变量解
含萘聚芳醚酮共聚物热处理后产生自由基的ESR谱
凤霞,,,王贵宾,姜振华
波谱学杂志 , 2003,
Abstract: 萘环摩尔含量20%的聚芳醚酮(PANEK)无规共聚物在340℃空气条件下发生交联反应,经过不同时间的热处理后,在室温检测热处理后产生的自由基ESR谱.它们都有一条较强的单峰,随着热处理时间的增长,自由基ESR谱的幅度增强,将微波功率加大到200mW,谱线发生明显的变化,出现两条重叠在一起的谱线,说明含萘环聚芳醚酮在热处理过程中产生了两种不同的自由基.文中模拟、讨论了热处理过程中产生的两种自由基的归属,一种是RO·自由基,另一种是萘自由基,它们都参与交联反应,RO·自由基起主要作用.
稀土案的法律思考(DS431, DS432, DS433)
The Legal Thinking on Rare Earth Case (DS431, DS432, DS433)
 [PDF]

李英,
Open Journal of Legal Science (OJLS) , 2015, DOI: 10.12677/OJLS.2015.32006
Abstract:
2012年3月13日,美国、日本和欧盟就中国稀土、钨矿及钼矿的出口限制措施向世界贸易组织争端解决机构起诉,随后7月23日WTO争端解决机构决定成立专家组审查此案,2014年3月26日,专家组报告公布,随后4月17日、25日中国分别针对美国、欧盟及日本提出上诉,同年8月7日,WTO公布上诉机构报告,宣告中方败诉。本文通过对稀土案所涉及的法律问题进行研究,着重分析中国承担的WTO义务、GATT1994第20条“一般例外”条款的解释与援引、国家经济主权与WTO规则的博弈等,剖析中国在该案件中暴露出的国内法规政策与WTO规则的冲突、对WTO规则及其适用的理解不充分、在争端解决的诉讼程序中举证能力不足等方面的问题,探讨国家在WTO框架下如何运用WTO规则维护国家经济主权。
On March 13, 2012, the United States, Japan and the European Union prosecuted China in export restrictions of rare earth, tungsten and molybdenum mine to the WTO Dispute Settlement Body. On July 23, WTO Dispute Settlement Body decided to set up expert group to review the case. On March 26, 2014, the panel report was released; hereafter on April 17th China appealed United States to Appellate Body, and on 25th China appealed Japan and European Union to Appellate Body. On August 7, 2014, WTO Appellate Body report was released, declaring Chinese lost. This article will analyze the legal issues involved in the case of rare earth research, the obligations of China to WTO, interpretation and quote of Article 20 of the GATT 1994, the game of national economic sovereignty and WTO Rules. Through analyzing the conflict exposed from China’s domestic laws and policies in this case with the WTO rules, the insufficient understanding of WTO rules, the lack of capacity in the proceedings the burden of proof in dispute settlement, this article will discuss how to use WTO rules to safeguard the country’s economic sovereignty under the WTO frame- work.
胶原蛋白的高效制备及与明胶的鉴别
汤俊,魏东芝,张国钧,沈菊泉,,周文瑜,马志英,
食品科学 , 2010,
Abstract: ?在分析酸提取法和酶解法提取牛皮中胶原蛋白各自的优缺点后,研究并最终确定了一种提取牛皮中胶原蛋白的新方法——酸酶复合法,该法工艺简单,在相对较短的制备时间内,胶原蛋白的提取率可以达到54.5%,同时又保证了胶原蛋白的天然三螺旋结构。同时以对胶原蛋白性质的研究结果为基础,建立一种快速且准确的胶原蛋白和明胶的鉴定及质量评价方法——快速鉴定评价法,包括聚丙烯酰胺凝胶电泳、丹宁酸沉淀实验、胰蛋白酶敏感性实验和体外成纤维能力实验。酸酶复合法和快速鉴定评价法对胶原蛋白提取工艺的大规模生产应用及对市场上各种产品的鉴定及品质评价具有实际意义。
制印标本组构的简便方法
,
地质与勘探 , 1986,
Abstract: 在地质研究工作中,地质工作者为了直观地说明地质现象及其意义,总要对某些具特殊结构、构造的岩石、矿石标本磨成光块或光片进行显微照相或做素描图,附于文字资料中,以增强表达力。绘制素描图需要一定的技巧,虽可有意识地突出结构构造特点,但缺乏真实感;照相法虽然表达真实,但花费时间长,成本高。我们试验用EP650Z复印机,直印标本光面,印制成的结构构造图象,反差适中,层次分明,形像逼真,并能按比例缩放,经济实用,速度快。下面是在复印机上印制的标本光面的结构构造图。
《中华人民共和国卫生部药品标准》中药成方制剂(第三册)简介
,郭伟
中国中药杂志 , 1991,
Abstract: <正>为了更好地继承和发展中药事业,不断提高中成药生产质量,以确保人民用药安全有效,卫生部自1986年开始,对全国各省、市、自治区、直辖市生产的几千个品种的中药成方制剂进行了全面整顿,经过医学和药学审查,对其中符合卫生部部级标准的品种,逐一进行整理、修订,分期分批地收入《中华人民
实时三维超声心电图对扩张型心肌病左心功能及同步化评估的研究进展
,李青
天津医药 , 2013,
Abstract: ?
沉迷网络游戏对青少年犯罪的影响及对策研究
Influence of Addicted to Online Games on Juvenile Delinquency and Countermeasures
 [PDF]

, 李明蔚, 高皙
Open Journal of Legal Science (OJLS) , 2015, DOI: 10.12677/OJLS.2015.34008
Abstract:
青少年沉迷网络游戏的现象较为普遍。究其原因除了基于青少年自身特殊的心理因素外,也与网络游戏固有的“吸引力”相关,与青少年所处的家庭、学校等社会环境因素相关。网游沉迷容易滋长青少年的暴力心理与行为、高额上网及游戏费用容易引发其对金钱的过度需要、也容易在玩游戏过程中结识不良人群。网游沉迷的预防除了有赖于加强学校和家庭对青少年的教育引导、青少年自身强化自我保护的意识之外,还应借鉴域外成功经验,加强政府监管力度,强化网络游戏从业者的行业自律。
More and more young people are becoming addicted to online games nowadays. The main reasons include their mental immaturity, families, impact from schools and the society and the online games’ inherent attractiveness. Being addicted to online games not only results in violence and excessive demand for money for internet access and in-game purchases, but also makes them easier to be exposed to misbehavior people. It relies on adolescents’ self-protection awareness and better guidance from schools and families as well as successful experience from foreign countries, stronger government supervision, and more stringent discipline for online game industry to prevent adolescents from becoming addicted to online games.
山西省临猗县癫痫现状调查
Situation of Investigation on Epilepsy in Linyi County of Shanxi Province
 [PDF]

高伟,, 张晓云,
International Journal of Psychiatry and Neurology (IJPN) , 2016, DOI: 10.12677/IJPN.2016.53006
Abstract:
目的:分析我国农村地区癫痫病的现状,给国家对于癫痫病的管理方法提供决策。方法:于2015年5月到8月期间随访当地癫痫患者的病因、发作类型、诊治和预后,进行回顾性分析。结果:共入选癫痫患者188例,包括局灶性发作158例,全面性发作17例、点头发作1例,不能确定者12例。均服用苯巴比妥和丙戊酸钠片,疗效为无发作率为22%、显效率为21%、有效率为8%、无效率为49%。病因主要为脑外伤和高热惊厥。部分患者存在社交焦虑症。结论:患者不能正确认识癫痫的基本常识;临床医生要根据发作类型和个体化原则选择抗癫痫药物,推荐在农村地区免费发放的抗癫痫药物目录中增加卡马西平。
Objective: To explore the situation of epilepsy patients in rural areas of Shanxi province in order to provide reference for prevention and treatment of the disease. Methods: From May to August in 2015, 188 patients with epilepsy were retrospectively analyzed on etiology, diagnosis and treatment, classifications and prognosis in the local hospital. Results: All patients took respectively phenobarbital and valproate sodium, including 158 focal seizures, 17 generalized seizures, 1 nod attacks and 12 unclassified seizures. After treatment of antiepileptic drugs, 41 cases (22%) were seizure free; 55 cases (29%) were effectively controlled, while 92 cases (49%) were invalid. The main causes of these patients were brain trauma and febrile convulsion. Many patients had social anxiety in process of seizure. Conclusion: There is a lack of understanding on seizures of epilepsy patients. Antiepileptic drugs must be chosen with good therapeutic effect according to the type of seizure and individuation. In view of the causes and types of seizures, carbamazepine is recommended as a kind of basic antiepileptic drugs in rural areas.
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