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Search Results: 1 - 10 of 73187 matches for " 董顺斌 "
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基于信用透支的公平电子现金交易系统*
,王绍,胡磊,王昭
计算机应用研究 , 2007,
Abstract: 综合分析电子现金系统各种模型,针对目前电子现金交易系统存在的问题,提出了基于信用透支的公平电子现金交易协议。采用了多重签名算法,实现了银行与实时交易分离,提高系统的运行效率;并能够在发生经济纠纷时,根据纠纷双方提供的电子证据实施仲裁,保证交易公平性。
大黄素抗胆囊癌作用的研究进展
王瑞涛,尹涵,,袁伟,柳言平,刘昌
中国中药杂志 , 2014,
Abstract: 大黄素是一种从中草药中提取的有效活性成分,具有抗微生物、抗炎、抗氧化及清除氧自由基、抑制血小板聚集、改善微循环、保护多种器官组织以及广泛的抗肿瘤作用。原发性胆囊癌是胆道系统常见的恶性肿瘤,手术根治性切除率低,缺乏有效的辅助治疗措施。大黄素的广谱抗肿瘤效应已经得到证实,其在胆囊癌的治疗上是否具有确切疗效尚无可靠的临床试验,其抗胆囊癌作用有待进一步实验考证。该文就大黄素抗胆囊癌作用的相关研究进展做一综述。
对置活塞二冲程内燃机折叠曲柄系方案设计研究
张付军,,,章振宇,吴滔滔,雪飞
兵工学报 , 2014, DOI: 10.3969/j.issn.1000-1093.2014.03.001
Abstract: ?结合一种新型对置活塞内燃机折叠曲柄系设计要求,提出4种折叠曲柄系统方案,利用Matlab/Simulink和ADAMS建立了仿真模型,通过运动学和动力学特性分析进行方案优选。计算结果表明,与传统内燃机相比,这4种折叠曲柄系活塞运动学关于上止点具有明显的非对称性,相同转速下使得膨胀时间和压缩时间均不相同,因而将对气流湍动能、扫气质量和燃烧等容度均产生不同影响;动力学上,活塞侧压力较传统二冲程内燃机大幅度减小,有利于减小气缸壁的磨损。由于方案4具有空间结构布置灵活性大,系统平衡性较好,活塞运动规律有利于提高内燃机的充气效率和加快内燃机燃油与空气的混合速率,同时可以缩短着火延迟时期的特点,所以方案4为最优方案。
食管鳞癌淋巴结转移的蛋白质组分析
,李俊材,傅仲学,蒲江,黄开
重庆大学学报 , 2008, DOI: 10.11835/j.issn.1000-582X.2008.05.025
Abstract: 分析食管鳞癌转移淋巴结中鳞癌细胞与食管鳞癌组织中鳞癌细胞的蛋白质的表达差异,获取鉴别两者的分子标志物.用激光捕获显微切割技术分离出食管鳞癌转移淋巴结和食管鳞癌组织中较纯的鳞癌细胞,运用双向电泳和质谱的方法检测两者表达的差异蛋白,并用免疫印迹技术对差异候选蛋白进行分析、验证.发现29个差异蛋白点,通过质谱鉴定出6种有意义的蛋白,转移淋巴结中的鳞癌细胞中如peroxiredoxin1等5种蛋白表达明显增高,1种蛋白MTCBP-1表达下调.因此激光捕获显微切割可以有效地解决组织异质性的问题;食管鳞癌组织中的鳞癌细胞与转移淋巴结中的鳞癌细胞的2-DE蛋白质图谱具有明显的差异表达,提示食管鳞癌的淋巴结转移过程的发生是多种蛋白质功能共同作用的结果,从而造成肿瘤细胞迁移性和侵袭性的进一步增强.
Ni修饰碳纳米管促进合成气高效制甲醇Cu基催化剂研究
沈炳,武小满,张鸿,林国栋,
化学学报 , 2004,
Abstract: 利用化学还原沉积法,制备一类Ni高度分散/修饰的多壁碳纳米管基新型材料y%Ni/MWCNT(y%为质量百分数),并用其作为促进剂,制备共沉淀型y%Ni/MWCNT促进的合成气高效合成甲醇Cu-ZnO-Al2O3催化剂,Cu6Zn3Al1-x%(y%Ni/MWCNT)(x%为质量百分数).实验发现,Ni对MWCNT的预修饰能明显地提高单纯MWCNT促进的Cu-ZnO-A12O3催化剂对合成气转化为甲醇的催化活性.在2.0MPa,493K,V(H2)V(CO)V(CO2)V(N2)=623053,GHSV=2700mL(STP)·h-1·(g-cat.)-1的反应条件下,所观测CO转化率达34%,相应甲醇时空产率为442mg·h-1·(g-cat.)-1,分别是非促进的基质催化剂Cu6Zn3Al1[最佳操作温度513K时为320mg·h-1·(g-cat.)-1]和单纯MWCNT促进的催化剂Cu6Zn3Al1-12.5%MWCNT[最佳操作温度503K时为378mg·h-1·(g-cat.)-1]的1.38和1.17倍.在反应温度≤503K时产物中甲醇的选择性≥98%;当反应温度>503K时有可观量CH4的生成,其选择性随催化剂中M含量及反应温度上升而增加.为兼获较高的CO转化率及相应甲醇选择性,催化剂的组成以Cu6Zn3Al1-12.5%(8%Ni/MWCNT)为佳,反应温度以~493K为宜.结合催化体系的表征(XRD,TPR,TPD)等结果,讨论了y%Ni/MWCNT促进剂的作用本质.
双向凝胶电泳-飞行时间质谱技术鉴定食管上皮细胞癌变时14-3-3proteinε、s100a9的表达
李俊材,傅仲学,,蒲江,黄开
中国生物工程杂志 , 2008,
Abstract: [摘要]目的:分析食管鳞癌和正常食管上皮细胞蛋白质的表达差异,获取鉴别两者的分子标志物。方法:通过激光捕获显微切割技术分离escc肿瘤细胞和癌旁上皮细胞,通过双向电泳和质谱技术鉴定表达异常的蛋白,并通过蛋白免疫印记证实部分差异蛋白的表达。结果:建立了食管癌组织和正常食管上皮蛋白的双向凝胶电泳图谱,通过质谱技术鉴定出14-3-3proteinε、s100a9等蛋白在食管癌变时差异表达,蛋白印记结果证实14-3-3proteinε、s100a9的表达量在食管癌变时分别上调和下调。结论:激光捕获显微切割是蛋白质组研究中的一个突破性的技术,可以有效地解决组织异质性的问题;本实验检测到的差异蛋白例如14-3-3proteinε、s100a9可能成为鉴别食管癌组织和正常食管上皮特异性的分子标记物。
包虫囊肿腹腔破裂的相关因素分析及疗效评价
Efficacy evaluation and analysis of factors for hydatid cyst rupture into the peritoneal cavity: A systematic review

王瑞涛,,,,,,,,,,,
- , 2016, DOI: 10.7652/jdyxb201606020
Abstract: 摘要:目的 回顾性分析国内外文献中关于包虫囊肿患者发生囊肿腹腔破裂的相关因素及特点,总结其诊治及预防措施。方法 通过文献检索,收集并研究1988年-2014年间中文或英文发表的关于包虫囊肿腹腔破裂的文献,针对文中发生囊肿腹腔破裂的相关因素及特点进行回顾性分析。结果 纳入的包虫囊肿发生破裂的32篇文献中,国外14篇,国内18篇,共2044例资料,按地理分布,国外1007例,国内1037例;囊肿破裂894例,破入腹腔385例;男性491例,女性288例,余未提供;年龄3~76岁,平均年龄39.5岁;囊肿部位多位于肝脏;破裂的囊肿平均直径多大于10cm;囊肿多由外伤致使破裂;囊型包虫破裂后365例患者表现为腹痛、恶心呕吐、腹部压痛及反跳痛明显的腹膜炎体征,随着病情发展,176例患者出现全身过敏性反应,并发皮肤荨麻疹、过敏性休克等;患者白细胞数均会升高,结合临床表现及腹部超声或CT基本可以确诊;治疗均采用紧急手术剖腹探查,多数患者达临床治愈;术前准备时间长短与患者临床表现、及时就诊和确诊相关;紧急手术后327例患者给予阿苯达唑预防复发,复发率低。结论 包虫囊肿破裂主要发生于包虫流行区域,中青年男性常发生破裂,破裂囊肿多位于肝脏,破裂率与囊肿大小相关,破裂后患者主要表现为急腹症及全身过敏反应,及时确诊、紧急手术彻底清除病灶及囊液是治疗的关键,术后应用阿苯达唑可有效预防包虫囊肿复发。
ABSTRACT: Objective To retrospectively analyze domestic and foreign literature regarding the related factors and characteristics of hydatid cysts rupture into the abdominal cavity and summarize its diagnosis, treatment and preventive measures. Methods Through systematic and comprehensive literature search, we collected 32 articles on hydatid cyst rupture into the abdominal cavity, which were published in 1988-2014 in Chinese or English. Results The 32 articles on hydatid cyst rupture consisted of 14 ones published abroad and 18 domestic ones. Geographical distribution: Among the 2044 cases involved, 1007 were distributed abroad and 1037 in China. Types of cyst rupture: rupture in 894 cases and rupture into the abdominal cavity in 385 cases. Sex distribution: 491 male and 288 female patients. Range of age: 3-76 years old, with the mean age of 39.5. The pathogenic site: mostly in the liver. Ruptured cyst size: mostly larger than 10cm in diameter. Causes of rupture: mostly trauma. Clinical symptoms: With cystic hydatid breaking into the abdominal cavity, 365 patients had abdominal pain, nausea, vomiting, abdominal tenderness and obvious signs of peritonitis with bounce pain. As the disease worsened, 176 patients had systemic allergic reaction, concurrent skin urticaria, anaphylactic shock, and increased count of white blood cells. Combined with clinical manifestations and abdominal ultrasound or CT diagnosis, this disease could be confirmed. The treatment of this disease usually adopted emergency laparotomy surgery, after which clinical cure was achieved in most patients, and it was highly dependent on the patient’s clinical manifestation, timely diagnosis and diagnosis. Postoperative application of albendazole hydatid cyst on 327 patients led to low recurrence rate. Conclusion Hydatid cyst rupture mainly occurs in hydatid-prevalent areas and among young and middle-aged men. The symptom of hydatid cyst rupture into the peritoneal cavity is relatively common. Cyst
低碳经济内涵研究
Research on Connotation of Low Carbon Economy
 [PDF]

朱轶, 刘家
Journal of Low Carbon Economy (JLCE) , 2013, DOI: 10.12677/JLCE.2013.21002
Abstract:
低碳经济内涵研究是低碳经济基础理论研究中的一项重要内容,它是低碳经济理论体系形成和建立的基石。本文在回顾和总结理论界有关低碳经济内涵研究成果的基础上,对低碳经济的内涵进行了界定,提出了狭义和广义两个层次的概念体系。笔者认为,狭义的低碳经济本质上反映了碳排放与经济增长之间的矛盾,是关于两者之间的选择问题。而广义的低碳经济(即低碳发展)是一个可持续发展问题,它的建立和实施是为了更好地解决人类发展的延续性和自然资源承载能力、生态环境容量之间的冲突。低碳经济与低碳发展虽然存在着一定的区别,但是两者在出发点、根本任务以及最终目标上有着统一性。因此,低碳经济是低碳发展的初级阶段和必由之路,低碳发展是低碳经济的最终目标。
The study related to low carbon economy concept is an important content in the basic theory research of low carbon economy. It is a block that low carbon economy theoretical system founded on. This paper has reviewed and summarized the results related to the connotation of low carbon economy at present, and defined the connotation of low carbon economy. Meanwhile, it has offered the conceptual system which is consist of narrow sense and broad sense of low carbon economy. The author considers that the narrow sense in essence reflects the contradiction between carbon emission and economic growth and is a selection problem about both sides. On the other hand, the generalized low carbon economy (means the low carbon development) is in essence a sustainable development problem. Its establishment and implement is in order to better solve the conflict between the continuity of human development and natural resources carrying capacity, the ecological environmental capacity. Low carbon economy and low carbon development though there exist a certain distinction, but both in starting point, basic task and ultimate goal have unity. Therefore, low carbon economy is initial stage and only way of low carbon development, low carbon development is the ultimate goal of low carbon economic.
碳排放与市场失灵(一)——碳排放负外部效应及其治理路径
Carbon Emissions and Market Failure (1)——Carbon Negative External Effect and Governance Path
 [PDF]

朱轶, 刘家
Journal of Low Carbon Economy (JLCE) , 2014, DOI: 10.12677/JLCE.2014.32002
Abstract:

温室气体过量排放的经济根源是低碳经济学理论研究的重要内容,也是构建有效减排路径和机制的基础性问题。本文以市场失灵理论中的外部效应理论为基础,探讨了碳排放的外部性表现以及治理路径。通过构造一个简单的生产性负外部效应模型,定量分析了厂商合并方式消除外部性对碳排放量的影响,并归纳出了碳减排路径实现的条件。本文认为,碳减排可以通过内部化的方式实现,而且只有在受污染企业追求自身利益最大化存在障碍时才会发生。
The economic root of excessive emissions of greenhouse gases is an important content in the low carbon economy theory, in which the basic problem is how to build the effective path and mechanism of the carbon emission reduction. This paper, on the basis of external effect theory in the market failure theory, has discussed the carbon emission externality performance and governance path. By building up a simple model of productive negative external effects, it has quantitatively analyzed the influence on the amounts of carbon emissions to manufacturers combined in order to eliminate external, and summed up realization conditions for the carbon emission reduction path. The article considers that carbon emission reduction can be achieved through the internalization of external effect, and the event will occur only if polluted enterprises are facing the obstacles when they pursue the maximization profits.

内蒙古柳坝沟金矿床同位素年代学研究
章永梅,顾雪祥,程文,树义,黄志全,吕鹏瑞,张兴
矿床地质 , 2010,
Abstract:
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