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Search Results: 1 - 10 of 30619 matches for " 董萌 "
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八氯二丙醚对BALB/c3T3细胞恶性转化的研究
,
中国公共卫生 , 2003, DOI: 10.11847/zgggws2003-19-09-24
Abstract: ?目的检测八氯二丙醚(S2)的细胞恶性转化作用。方法采用传代细胞系BALB/c3T3细胞进行细胞毒性实验确定转化实验的剂量范围,再进行细胞转化实验并对转化细胞进行恶性行为鉴定。结果S2各剂量组均能诱发该细胞出现典型的细胞转化灶,并呈剂量-反应关系;软琼脂培养证明转化细胞为恶性转化细胞。结论S2具有致BALB/c3T3细胞恶性转化作用,有必要进行深入研究。
反正切形式跟踪微分器设计及相平面分析
,张平
控制理论与应用 , 2010,
Abstract: 跟踪微分器可以从不连续或含有噪声的测量信号中提取连续滤波信号和微分信号.本文从二阶跟踪微分器的加速度函数式入手,提出一种反正切形式的跟踪微分器结构,利用李雅普诺夫第二方法证明其具有全局一致渐进稳定性,利用相平面分析方法研究,说明原点是稳定结点或稳定焦点,并给出跟踪微分器参数调节的定性规律和约束条件.最后在含有噪声的方波输入下进行仿真,结果表明反正切形式跟踪微分器可以兼顾跟踪快速性与过渡过程平稳性,并且具有很好的滤波效果,可以给出连续平滑的跟踪信号和微分信号,而且待调节的参数较少,具有工程实用价值.
含硫化铁结核薄煤层采煤机工作机构载荷问题
赵丽娟,
煤炭学报 , 2009,
Abstract: 通过对含硫化铁结核薄煤层采煤机工作机构实际工况的分析,建立了复杂煤层条件下采煤机滚筒的受力模型,利用Matlab软件编制了滚筒瞬时负载的模拟程序;生成了滚筒瞬时负载的文本文件,并将其成功地导入机械系统运动学和动力学仿真软件ADAMS环境下建立的采煤机截割部刚柔耦合虚拟样机系统中,为定量研究采煤机截割部工作的可靠性提供了条件,使复杂煤层赋存条件下的薄煤层实现综采成为可能.研究结果表明,利用Matlab能准确地模拟复杂地质条件下采煤机工作机构遇到大块、硬结核体时滚筒瞬时负载的剧烈变化;Matlab文件操作函数生成负载文本的方法,能有效处理具有非线性、时变性、强耦合的复杂载荷问题.
煤矿井下近水平定向钻进配套钻杆的研制
田东庄,石智军,龚城,
煤炭科学技术 , 2013,
Abstract: 针对进口定向钻进装备配套钻具在使用过程中出现的问题,结合我国煤矿具体地质赋存特点和定向钻进技术要求,通过对定向钻进配套钻具工作条件分析、材料优选、结构优化和性能检测,确定了中心通缆钻杆的螺纹结构和信号传递装置结构,研制成功了高强度?73mm中心通缆钻杆及其配套钻具,并制定了钻杆的性能检测标准。现场工业性试验期间,利用?73mm中心通缆钻杆实现了煤矿井下近水平定向钻进钻孔深度1212m,钻进过程中信号传递实时、高效、可靠,可满足煤矿井下随钻测量千米孔深定向钻进的使用要求。
鹿胎与仔鹿的成分及药理比较
杨洗尘,金香,
中国中药杂志 , 1991,
Abstract: <正>鹿胎为稀贵中药,用于月经不调,宫冷不孕,崩漏带下,肾虚体弱,是“鹿胎膏”和“女宝”等中成药的原料。商品鹿胎的来源,
β-内酰胺类抗生素对吗啡耐受及依赖作用
,华进,宫泽辉
药学学报 , 2008,
Abstract: 为了研究头孢曲松及其类似物是否具有对抗吗啡耐受及依赖作用和头孢曲松对抗吗啡耐受的量效关系,本文采用小鼠热板舔足模型及纳洛酮戒断模型对头孢曲松、头孢拉定和头孢替安等6种β-内酰胺类抗生素进行观察,并与生理盐水对照组比较。100mg·ml-1头孢曲松和头孢噻肟在吗啡形成耐受模型后第10天可能最大镇痛百分率(pmap)分别为74.95%和65.94%,与生理盐水组(22.99%)比较具有显著性。100和50mg·kg-1头孢曲松对戒断实验小鼠30min内平均跳跃次数为3.8和3.6,与对照组(20.9)比较具有显著性。结果表明,100mg·kg-1头孢曲松和头孢噻肟对吗啡诱导的耐受和躯体依赖具有显著的抑制作用。头孢曲松具有剂量依赖性的抗吗啡耐受作用。
度量生物性状广义相关系数的抽样分布及假设检验
,袁志发?
西北农林科技大学学报(自然科学版) , 2010,
Abstract: 【目的】完善生物性状非线性相关性的广义相关系数理论体系,为实际育种工作提供一套完整的理论体系。【方法】采用构造综合指标,借助于一元线性回归模型,对度量生物性状线性、非线性相关性的广义相关系数的抽样分布及假设检验问题进行研究。【结果】该广义相关系数服从f分布或t分布,可用f检验或者t检验对该相关系数与0之间的差异显著性进行检验。【结论】建立的广义相关系数检验方法计算简单、无信息损失,线性与非线性广义相关系数的定义、性质、抽样分布及假设检验问题都予以解决,丰富了多元统计学内容。
牛黄解毒片的遗传毒性研究
,,王姝
癌变·畸变·突变 , 2009,
Abstract: ?背景与目的:评价牛黄解毒片是否具有遗传毒性作用。材料与方法:采用ames试验、小鼠骨髓细胞微核试验和小鼠精子畸形试验对牛黄解毒片进行遗传毒性检测。结果:ames试验各剂量组回变菌落数均未超过溶剂对照组的2倍,3个剂量组的微核率和精子畸形率与溶剂对照组比较,差异均无统计学意义(p>0.05)。结论:在本试验条件下,牛黄解毒片未见遗传毒性作用。
可见光催化剂Fe3O4/BiOI的制备及其催化活性研究
Study on Preparation and Catalytic Activity of Fe3O4/BiOI under Visible Light Radiation
 [PDF]

张强, 陈耀, 小霞, 崔逸, 申贵宾, 燕启社
Water pollution and treatment (WPT) , 2016, DOI: 10.12677/WPT.2016.43011
Abstract:
采用水热法合成了磁性的、可见光响应的Fe3O4/BiOI复合光催化剂,运用X射线衍射(XRD),扫描电子显微镜(SEM),紫外–可见漫反射光谱(UV-vis DRS)对所制备的光催化剂进行了表征,结果显示所制备的复合光催化剂的粒径范围为0.5~2 μm且形貌呈球形结构。在可见光照射下,通过降解甲基橙测定不同比例复合光催化剂的活性大小,结果表明当Fe3O4的负载量为5%时,复合光催化剂具有最佳的光催化活性,甲基橙的降解率可达81%;而单纯的BiOI的降解率仅为40%。通过外部磁场的作用,Fe3O4/BiOI复合光催化剂能快速彻底地从体系中分离。复合光催化剂实现了外部磁场控制的循环回收利用,在实际应用中具有潜在的价值。
Magnetic Fe3O4/BiOI composite photocatalysts with visible light response were successfully fab-ricated through hydrothermal method and characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), UV-visible diffuse reflection spectroscopy (UV-vis DRS) respectively. The characterization results show that the grain sizes of composite photocatalysts samples were varied from 0.5 μm to 2 μm and their morphologies were spheroid. The activities of composite photocatalysts with different proportions were evaluated by photodegradation of methyl orange under visible-light irradiation. Results show that the 5% Fe3O4/BiOI composite photocatalyst has the best photocatalytic activity. After 120 min of irradiation, removal rate of methyl orange reached to 81%, which was superior to the pure BiOI (40%). By the effect of the external magnetic field, the composite photocatalysts can be quickly and completely separated from the system, indicating a potential prospect in the practical application.
经电子支气管镜孔道注射博来霉素治疗咽喉部血管瘤的疗效观察
蒋虹,,梁勇军
- , 2018,
Abstract: 摘要: 摘要:目的??探讨经电子支气管镜孔道局部注射博来霉素治疗咽喉部血管瘤的临床疗效。方法?对该科2010年1月-2017年6月收治的有完整资料的34例咽喉部血管瘤患者进行回顾性分析。所有患者均经电子支气管镜孔道进行博来霉素的局部注射治疗,最多注射6次,最少2次,平均4.5次,以电子支气管镜检查瘤体大小变化作为疗效观察的主要评价指标。结果?所有患者均表面麻醉下完成手术,痊愈28例(82.4%),有效6例(17.6%),总有效率100.0%。1例因为血管瘤瘤体大,行预防性气管切开,1个月后顺利拔管。所有患者术后复查血常规及胸片,未出现白细胞减少及肺纤维化等不良反应。结论?经电子支气管镜孔道注射博来霉素治疗咽喉部血管瘤效果显著,具有创伤小,安全性高、可反复治疗和对喉功能保留好等优点,值得在临床上推广应用。
Abstract: Abstract: Objective?To investigate the clinical effect of local injection of Bleomycin in treatment for laryngeal and pharyngeal hemangioma with the association of electronic bronchoscope.?Methods?We conducted a retrospective analysis of the clinical data of 34 patients who diagnoses with laryngeal and pharyngeal hemangioma from January 2010 to June 2017. All the patients received local injection treatment of Bleomycin with the association of electronic bronchoscope. The injection frequencies were 6 times at most and twice at least, and the average was 4.5 times. With the changes of the size of the tumor as examined by electronic bronchoscope as a primary evaluation index.?Result?All the patients received the treatment under surface anesthesia. 28 cases (82.4%) were cured, and 6 cases (17.6%) were improved. The total effective rates of the group was 100.0%. One patient with giant hemangioma received preventive tracheotomy and was successfully extubated after 1 month. There was no case appeared adverse effect such as aleucocytosis and pulmonary fibrosis in all the patients who were reexamined of blood routine and chest X-ray after treatment.?Conclusion?The advantage of the methods of Bleomycin local injection treatment for pharynx and larynx hemangioma with the association of electronic bronchoscope was significant effective, which with small trauma, high security, repeatable treatment, good protection of larynx function and it was worthy of promoting in clinical practice.
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