检索结果-南通市图书馆

China Journal of Accounting Research 2012年第3期5卷 251-268页

作者： Zhiying hu weixing Cai Jinjin Han Rula Sa Dong Ling School of Economics University of Science and TechnologyChina

Using a sample of IPO companies on the Shenzhen Small and Median Enterprise Board and the ChiNext Stock Market between 2005 and 2009, this paper analyzes the effect of venture capital participation on accounting information quality. We find that venture capitalists have a significant effect on earnings management, with reduced discretionary accruals before the expiration of the equity lock-up period and enhanced discretionary accruals after the expiration of the equity lock-up period. Our findings support the moral hazard hypothesis of venture capital, but not the certification/monitoring role of venture capital in IPOs. In addition, we find that venture capital plays a more important role in the earnings management of non-state-owned IPO companies than of state-owned companies.

关键词： Venture capital Earnings management IPO Lock-up period

Bone marrow stromal cell versus neural stem cell transplantation in a C6 glioma rat model

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Neural Regeneration Research 2010年第7期5卷 502-507页

作者： Hanjun Tu Juntao hu Yanxia Lue Li Zhang hui Wang Zhangming Zhou weixing Wang Department of Surgery Renmin Hospital of Wuhan University Wuhan 430060 Hubei Province China Department of Neurosurgery Taihe Hospital of Yunyang Medical College Shiyan 442000 Hubei Province China Department of Physiology Yunyang Medical College Shiyan 442000 Hubei Province China

BACKGROUND： Embryonic neural stem cells （NSCs） have provided positive effects for the treatment of glioma. However, the source for embryonic NSCs remains limited and high amplification conditions are required. Bone marrow stromal cells （BMSCs） have been proposed for the treatment of glioma. OBJECTIVE： To investigate biological changes in NSCs and BMSCs following transplantation into rat models of glioma. DESIGN, TIME AND SETTING： A randomized, controlled, animal experiment was performed at the Embryonic Stem Cell Research Laboratory of Yunyang Medical College from February 2006 to August 2008. MATERIALS： The rat C6 glioma cell line was purchased from Institute of Biochemistry and Cell Biology, Shanghai Institutes for Biological Sciences, Chinese Academy of Sciences; mouse anti-bromodeoxyuridine （BrdU） monoclonal antibody and Cy3-1abeled goat anti-mouse IgG antibody was purchased from Upstate, USA. METHODS： A total of 95 Sprag6ue Dawley rats were randomly assigned to three groups： NSC （n = 35）, transplanted with 〉 6 × 10^6 NSCs via left medial hind limb; BMSC （n = 35）, transplanted with 〉 1 × 10^6 BMSCs via left medial hind limb; model group （n = 25）, injected with the same volume of 0.1 mmol/L phosphate buffered saline. MAIN OUTCOME MEASURES： Gliomal growth and size were assessed by nuclear magnetic resonance, and glioma morphological features were observed following hematoxylin-eosin staining and BrdU immunohistochemistry 3 and 4 weeks following transplantation. RESULTS： The average survival of rats in the BMSC, NSC, and model groups was 4.03, 4.28, and 3.88 weeks. At 3 weeks, there was no significant difference in the average glioma diameter between the BMSC and model groups （P 〉 0.05）. However, gliomal diameter was significantly decreased in the NSC group compared with the model group （P 〈 0.05）. At 4 weeks, there was no statistical difference between the groups （P 〉 0.05）. BrdU immunohistochemistry revealed that BMSCs and NSCs appeared to migrate to the gliomas.

关键词： neural stem cells bone marrow stromal cells C6 glioma cell transplantation rats

A RESEARCH ON THE CONSTRUCTION OF VIRTUAL-CIRCUIT SERVICE PERFORMANCE MODELS BY IDENTIFICATION METHODS

在线全文

学校读者我要写书评

暂无评论

A RESEARCH ON THE CONSTRUCTION OF VIRTUAL-CIRCUIT SERVICE PE...

Yield and Quality Performance of Japonica Rice Varieties Grown in the Late Season in a Double Rice Cropping System of China

1992 International Conference on Communication Technology ICCT’92

作者： Jiang weixing hu Daoyuan Shi Meilin Dept.of Computer Science and Technology Tsinghua University

＜正＞The user oriented performance of a virtual-circuit provided by packet-switching networks is often approximatly modeled as a tandem-queue with certain *** determine the parameters of the model,a good understanding about the internal structure of the virtual-circuit is usually required in the approaches now *** may add heavy burden on the *** this paper,we present a new approach for the determination of the model’s parameters, relying on end-to-end measurements of the virtual-circuit *** problem of the parameters determination can then be generally characterized as the problem of tandem-queue identification,which is still an open *** the help of discretalization approximation,a set of algebraic equations describing the relations between the internal parameters and the external measures of the tandem-queue is ***,the problem of tandem-queue identification can be solved by finding the solutions of the *** an example to demonstrate the major features of the solution process,an identification algorithm for the tandem-queues which contain two queues having regards to certain constraints is ***,the key considerations involved in extending the algorithm to general tandem-queues are briefly addressed.

关键词：

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

Agricultural Science & Technology 2015年第1期16卷 70-76,98页

作者： Shan huANG hu HE Xiufu ZHANG weixing ZHANG Xiaohua PAN Collaborative Innovation Center for the Modernization Production of Double Cropping Rice/Jiangxi Key Laboratory of Crop Physiology Ecology and Genetic Breeding Ministry of Education Jiangxi Agricultural University China National Rice Research Institute

Meeting the demand for high-quality japonica rice is a major challenge facing China's grain security. In the present study, a two-year field experiment was conducted to investigate the yield, quality, and profitability of japonica rice varieties(including hybrids and inbreds) grown in the late season as compared with local elite indica hybrids in a double rice cropping system of China where indicas are traditionally planted. Indica hybrids had significantly longer vegetative(from sowing to heading) and total(from sowing to maturity) growth durations than japonicas in both2011 and 2012, while reproductive growth duration(from heading to maturity) was longer for indica hybrids than for japonicas in 2011 but not in 2012. Indica hybrids produced higher grain yield than japonicas in 2011, but with no significant differences in 2012. Japonicas had higher brown rice, milled rice, and head rice percentages than indicas, but had lower gelatinization temperature and amylose content,while with no significant differences in gel consistency and protein content. Indica hybrids tended to have lower chalky grain percentage and chalkiness degree than japonicas, though the differences were not statistically significant due to large genotypic variations. The net returns were 16.1% and 9.9% greater for indica hybrids than for japonica hybrids and japonica inbreds in 2011, with only 3.8% and 1.3% in2012, respectively. Thus, our results suggest that replacing indicas with japonica varieties as late rice may not be feasible at the present site unless locally adapted japonica varieties are developed.

关键词： Grain quality Indica Japonica Late rice Yield

在线全文

学校读者我要写书评

暂无评论

社区恶性肿瘤防治模型的建设与创新

中国医药科学 2012年第24期2卷 200-200,206页

作者：杨永贵李峰胡卫星丁亚男江苏省大丰市小海中心卫生院江苏大丰224100 江苏省盐城市疾病预防控制中心江苏盐城224000 江苏省大丰市疾病预防控制中心江苏大丰224200

目的探讨社区恶性肿瘤防治模型的建设与创新。方法选取100名社区人员进行以健康教育为主的问卷调查,对调查结果进行分析。结果 100名参与人员对恶性肿瘤发生原因的知晓率、临床表现的知晓率、预防措施的知晓率及防治知识的知晓率,治疗... 详细信息

目的探讨社区恶性肿瘤防治模型的建设与创新。方法选取100名社区人员进行以健康教育为主的问卷调查,对调查结果进行分析。结果 100名参与人员对恶性肿瘤发生原因的知晓率、临床表现的知晓率、预防措施的知晓率及防治知识的知晓率,治疗后高于治疗前,差异有统计学意义(P<0.05)。结论有效的健康教育是防止癌症发病几率,提高社区人员癌症知晓率的最佳方式。

关键词：恶性肿瘤防治模型建设创新

养元健骨汤联合常规补钙对老年股骨粗隆间骨折髓内钉术后患者骨密度及骨折愈合速度的影响

同方期刊数据库博看期刊评论

在线全文

学校读者我要写书评

暂无评论

中国药业 2024年第15期33卷 84-87页

作者：朱发军张屹胡东陈辉王晶臧红春吴新淼王维星张永光侍氢江苏省宿迁市中西医结合医院江苏宿迁223800

目的探讨养元健骨汤联合常规补钙对老年股骨粗隆间骨折髓内钉术后患者骨密度及骨折愈合速度的影响。方法选取医院2018年1月至2022年2月收治的老年股骨粗隆间骨折行髓内钉术的患者90例,按随机数字表法分为常规补钙组和养元健骨汤组,各4... 详细信息

目的探讨养元健骨汤联合常规补钙对老年股骨粗隆间骨折髓内钉术后患者骨密度及骨折愈合速度的影响。方法选取医院2018年1月至2022年2月收治的老年股骨粗隆间骨折行髓内钉术的患者90例,按随机数字表法分为常规补钙组和养元健骨汤组,各45例。两组患者术后均予常规补钙治疗,养元健骨汤组患者加用养元健骨汤,均持续治疗1个月。结果养元健骨汤组总有效率为93.33%,显著高于常规补钙组的73.33%(P 0.05)。结论养元健骨汤联合常规补钙治疗老年股骨粗隆间骨折髓内钉术后的临床疗效良好,能增加患者的骨密度,加快骨折愈合速度,且安全性良好。

关键词：养元健骨汤常规补钙股骨骨折髓内钉术骨密度骨折愈合速度

基于Moldflow的拉链链牙成型工艺参数优化

在线全文

学校读者我要写书评

暂无评论

塑料 2024年第4期53卷 145-150页

作者：胡茗朝张莉杨志曹淼龙浙江科技学院机械与能源工程学院浙江杭州310023 台州学院智能制造学院浙江台州318000 浙江伟星实业发展股份有限公司浙江临海317024

针对拉链链牙注塑工艺参数对成型质量影响较大的问题,分析了拉链链牙的结构特征,利用Moldflow软件对拉链链牙进行模流仿真分析,发现,翘曲变形是影响链牙成型的重要因素。以链牙X方向的最大收缩变形为优化目标,注射时间、熔体温度、保压... 详细信息

针对拉链链牙注塑工艺参数对成型质量影响较大的问题,分析了拉链链牙的结构特征,利用Moldflow软件对拉链链牙进行模流仿真分析,发现,翘曲变形是影响链牙成型的重要因素。以链牙X方向的最大收缩变形为优化目标,注射时间、熔体温度、保压时间、模具温度为试验因素,进行4因素4水平正交试验,对试验结果进行经极差与方差分析,得到上述工艺参数与收缩变形量的影响关系,并选出一组最优的工艺参数组合为注射时间为2 s,熔体温度为195℃,保压时间为2.5 s,模具温度为70℃。经仿真验证,优化后,X方向最大收缩变形降低了8.09%。通过实验验证,优化工艺参数可有效改善链牙注塑成型质量。

关键词：拉链模流仿真翘曲变形正交试验收缩变形

Olivine-norite rock detected by the lunar rover Yutu-2 likely crystallized from the SPA-impact melt pool

在线全文

学校读者我要写书评

暂无评论

National Science Review 2020年第5期7卷 913-920页

作者： Honglei Lin Zhiping He Wei Yang Yangting Lin Rui Xu Chi Zhang Meng-hua Zhu Rui Chang Jinhai Zhang Chunlai Li Hongyu Lin Yang Liu Sheng Gou Yong Wei Sen hu Changbin Xue Jianfeng Yang Jie Zhong Xiaohui Fu weixing Wan Yongliao Zou Key Laboratory of Earth and Planetary Physics Institute of Geology and Geophysics Chinese Academy of Sciences Key Laboratory of Space Active Opto-Electronics Technology Shanghai Institute of Technical Physics Chinese Academy of Sciences State Key Laboratory of Lunar and Planetary Sciences Macau University of Science and Technology Beijing Institute of Space Mechanics and Electricity State Key Laboratory of Space Weather National Space Science CenterChinese Academy of Sciences State Key Laboratory of Remote Sensing Science Institute of Remote Sensing and Digital Earth Chinese Academy of Sciences Key Laboratory of Electronics and Information Technology for Space System National Space Science Center Chinese Academy of Sciences Xi'an Institute of Optics and Precision Mechanics Chinese Academy of Sciences Institute of Optics and Electronics Chinese Academy of Sciences Shandong Provincial Key Laboratory of Optical Astronomy and Solar-Terrestrial Environment Institute of Space SciencesShandong University

Chang’E-4 landed in the South Pole-Aitken (SPA) basin,providing a unique chance to probe the composition of the lunar *** landing site is located on ejecta strips in Von Karman crater that possibly originate from the neighboring Finsen crater.A surface rock and the lunar regolith at 10 sites along the rover Yutu-2 track were measured by the onboard Visible and Near-Infrared Imaging Spectrometer in the first three lunar days of mission *** situ spectra of the regolith have peak band positions at 1and 2μm,similar to the spectral data of Finsen ejecta from the Moon Mineralogy Mapper,which confirms that the regolith’s composition of the landing area is mostly similar to that of Finsen *** rock spectrum shows similar band peak positions,but stronger absorptions,suggesting relatively fresh *** rock may consist of 38.1±5.4%low-Ca pyroxene,13.9±5.1%olivine and 48.0±3.1%plagioclase,referred to as *** plagioclase-abundant and olivine-poor modal composition of the rock is inconsistent with the origin of the mantle,but representative of the lunar lower ***,the rock crystallized from the impact-derived melt pool formed by the SPA-impact event via mixing the lunar crust and mantle *** scenario is consistent with fast-cooling thermal conditions of a shallow melt pool,indicated by the fine to medium-sized texture (<3 mm) of the rock and the SPA-impact melting model[Icarus2012;220:730-43].

关键词： impact basin lunar interior composition visible and near-infrared spectra lunar rover Yutu-2 Chang’E-4 mission

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

PPP项目范式选择与风险分配的关系研究

土木工程学报 2011年第9期44卷 139-146页

作者：胡振刘华金维兴西安建筑科技大学陕西西安710055

基于15个案例,分析PPP项目三种范式选择方案与风险分配之间的相关关系,结果发现:一部分项目风险的分配方案与范式选择无关,这类风险的主要特征是产生主体明确且能够防范,风险事件的发生直接针对PPP项目;另一部分项目风险分配方案与范式... 详细信息

基于15个案例,分析PPP项目三种范式选择方案与风险分配之间的相关关系,结果发现:一部分项目风险的分配方案与范式选择无关,这类风险的主要特征是产生主体明确且能够防范,风险事件的发生直接针对PPP项目;另一部分项目风险分配方案与范式选择高度相关,其相关关系体现为随着范式私有化程度的提高,民间实体承担的风险也在逐渐增大,而且随着范式选择的不同,风险转移的时机和程度也有所差异,这类风险的主要特征是风险事件产生于政府或第三方,民间实体没有能力进行防范,风险损失需要在政府和民间实体之间进行分配。研究结论可为提高我国PPP项目风险分配的科学性提供指导和借鉴。

关键词： PPP 范式选择风险分配

The first time observations of low-latitude ionospheric irregularities by VHF radar in Hainan

在线全文

学校读者我要写书评

暂无评论

The first time observations of low-latitude ionospheric irre...