低碳钢的大应变低周疲劳

对三种低碳钢的不同缺口的轴对称圆柱形试样在大应变循环下的低周疲劳行为进行了研究。以考察失效周次在１００次以内的疲劳断裂行为。结果表明随着被控循环应变幅度的增大，低碳钢的低周疲劳寿命降低，断裂模式则由疲劳解理逐渐向延性韧窝过渡。缺口处的三向应力程度以及起始循环加载的静态损伤都对最终的疲劳失效有重要的影响。建议采用一种广义的循环应变参量上来概括影响这种大应变低周疲劳的诸因素，从而可以采用修正的Ｃｏｆｆｉｎ－Ｍａｎｓｏｎ关系式描述其疲劳行为

Comparison of uncut Roux-en-Y anastomosis and traditional Roux-en-Y anastomosis in the totally laparoscopic distal gastrectomy for gastric cancer: An analysis of multiple centers' data

目的对比非离断式(Uncut)Roux-en-Y吻合和传统Roux-en-Y吻合应用于全腹腔镜远端胃癌根治术后消化道重建的安全性和短期疗效。方法回顾性分析国内10家单位共60例远端胃癌根治术后全腹腔镜消化道重建的胃癌病人临床资料,根据消化道重建方式不同分为Uncut Roux-en-Y组(Uncut组)34例,传统Roux-enY组(传统组)26例。结果 Uncut Roux-en-Y吻合在消化道重建时间方面用时更短[(51.5±13.3)min vs.(80.4±16.2)min,P=0.000],出血量更少[(60.0±35.6)m L vs.(132.9±65.1)m L,P=0.000],且在进食半流饮食时间方面具有优势[(4.6±1.5)d vs.(7.2±2.3)d,P=0.000]。两组病人在留置胃管时间、术后排气时间、进食流质时间和术后住院时间方面差异无统计学意义。两组病人均无围手术期死亡病例,并发症发生率差异无统计学意义(8.8%vs.7.7%,P=0.875)结论 Uncut Roux-en-Y吻合和传统Roux-en-Y吻合应用于全腹腔镜下消化道重建安全可行,Uncut Roux-en-Y吻合在重建时间和控制出血量方面具有优势。Objective To compare the security and short-term effect of the digestive tract reconstruction during the totally laparoscopic distal gastrectomy for gastric cancer between the Uncut Roux-en-Y anastomosis and the traditional Roux- en- Y anastomosis. Methods The clinical data of 60 gastric cancer patients with digestive reconstruction underwent totally laparoscopic distal gastrectomy between December 2012 and June 2015 in 10 domestic hospital were analyzed retrospectively. According to the difference of digestive reconstruction,it can be divided into the Uncut Rouxen-Y anastomosis group with 34 patients and the traditional Roux-en-Y anastomosis group with 26 patients. Results In uncut Roux-en-Y anastomosis group,the operative time in digestive reconstruction was shorter[(51.5±13.3)min vs.(80.4±16.2)min,P=0.000]; the intraoperative blood loss was less[(60.0±35.6)m L vs.(132.9±65.1)m L,P=0.000];semi-liquid diet time was earlier[(4.6±1.5)d vs.(7.2±2.3)d,P=0.000]. However,there was no difference between the two groups on nasogastric tubegastrointestinaltwo groups on nasogastric tube,gastrointestinal transit,fluid diet and the duration of postoperative hospital stay. Both groups had no death case during the perioperative period and there was no significant statistical difference in the postoperative complication rates(8.8% vs. 7.7%,P=0.875).Conclusion The Uncut Roux- en- Y anastomosis and the traditional Roux-en-Y anastomosis are both safe and feasible for the digestive reconstruction under the totally laparoscopic distal gastrectomy for gastric cancer. Besides,the Uncut Roux- en- Yanastomosis has other advantages such as less reconstruction time and less bleeding.广东省科技计划项目(No.2014A020212591

中国西部开发重点区域规划前期研究

<font color="#ff0000">中国</font>科学院知识创新工程重大项目之课题(KZCX-10-09) 国务院<font color="#ff0000">西部</font>地区<font color="#ff0000">开发</font>领导小组办公室委托项目(西办综函[2002]11号):本书对<font color="#ff0000">西部</font><font color="#ff0000">重点</font>经济带的范围和等级给予定位，阐述了<font color="#ff0000">西部</font>主要中心城市的...&nbsp;&nbsp;中国科学院知识创新工程重大项目之课题(KZCX-10-09) 国务院西部地区开发领导小组办公室委托项目(西办综函[2002]11号

15.14 MeV/u ~(136)Xe离子引起的单粒子效应(英文)

研究了 1 5.1 4MeV/u136 　Xe离子在不同批次的 3 2k× 8bits静态存储器中所引起的单粒子效应 .获得了单粒子翻转和单粒子闭锁截面与入射角度的依赖关系 .将单粒子效应截面与灵敏区中沉积的能量相联系 ,而不是线性能量转移(LET)值 .估计了灵敏体积的深度和死层的厚度

1995～2011年CERN土壤环境元素含量数据集

土壤环境是地球环境的重要组成部分。目前土壤环境问题的关注重点在于土壤污染。我国土壤污染以无机污染为主。中国生态系统研究网络(Chinese Ecosystem Research Network,CERN)自1988年组建以来,在中国主要农田、森林、草原、荒漠、湿地生态系统中,按统一的规范,对与土壤环境状况有关的铁、锰、铜、锌、硼、钼、镉、铬、铅、镍、汞、砷、硒元素进行了长期定位监测。通过对CERN典型生态样地表层土壤环境元素监测数据进行加工处理,获得1995～2011年中国陆地生态系统土壤环境元素含量数据集。本数据集中13种土壤环境元素指标测定的相对误差平均为6.55%,重复测定的相对偏差为7.70%。同时附有完整的背景信息,保证了数据在空间和时间上的一致性。本数据集可以为全国和区域土壤环境质量评估、土壤污染风险评价以及环境土壤学研究等工作提供数据基础