β-榄香烯立体结构的分子力学研究

利用分子力学计算方法研究了β-榄香烯的构型和构象．通过能量最小化,对所有构象空间进行烯基取代基旋转势能极小点的全面搜索,确定了β-榄香烯的优势空间构象;并且与β-榄香烯衍生物的单晶X-射线衍射结构测定的有关结果做了比较和讨论     

影响大强度负荷后血乳酸清除速率的因素

为揭示大强度负荷后放松活动强度、运动员运动水平和机能水平与血乳酸清除速率之间的关系,选择２２名游泳运动员进行实验。结果表明：放松活动强度影响血乳酸清除速率,血乳酸下降曲线存在“拐点”现象,其位置与运动员个体训练水平,机体血乳酸清除能力有关;运动员运动等级水平高、ＩＬＡＴ指数小则血乳酸清除能力强。     

HPLC检测鳗鱼中部分氟喹诺酮类药物残留

建立了高效液相色谱法检测鳗鱼中恩诺沙星、环丙沙星、诺氟沙星等合成抗菌剂残留的方法。样品以乙腈为提取剂,经脱脂、净化、浓缩,用流动相溶解。用高效液相色谱荧光检测器测定恩诺沙星、环丙沙星、诺氟沙星。各标准曲线线性范围0.05~1.20μg/ml,线性相关系数r=0.9911-0.9943,实验回收率为55.0%~85.9%,RSD在5.58%~7.38%(n=5),检测低限分别为1μg/kg,2μg/kg,2μg/kg。     

关于古代希腊、罗马解放奴隶现象的思考

奴隶解放是奴隶制社会的一个重要现象。从军事、政治、经济、奴隶主个人情感及娱乐等方面探讨了奴隶制国家和奴隶主个人解放奴隶的原因。     

对我国优秀女子标枪运动员最后用力阶段右肩与右髋速度特征的三维运动学分析

运用三维运动学分析方法对参加第 13届亚运会的我国 6名优秀女子标枪运动员的最后用力阶段的技术动作进行解析 ,结果表明 :最后用力阶段右髋动作加快与制动的时机不甚理想 ,躯干相关肌群有过早收缩发力的现象 ,从而影响右肩速度的变化 ;发现右肩速度超过右髋速度的时机也不理想 ,右肩与右髋的动量传递效果与右脚的拖拉制动动作连接不紧 ,以至减小了最后用力的效果     

妇科肿瘤患者化疗后骨髓Ⅳ级抑制的护理

通过１４例妇科肿瘤患者化疗后骨髓Ⅳ级抑制的护理,探讨在无隔离层流室的条件下医疗护理的信度和效度,经过护理人员的精心护理和医疗干预,除２例病情好转后放弃继续治疗外,１２例均痊愈出院,说明只要及早发现并对高危因素进行评估,采取积极的措施,化疗后骨髓Ⅳ级抑制是能得到控制和康复的。     

Scaling the cricket pitch to fit junior players

ABSTRACT

Studies in several sports have shown the benefits of adapting the playing environment to fit junior players. Frequently the changes are pragmatic choices based on space constraints or existing line markings, or the result of simple scaling based on stature. In this study, a method of scaling the cricket pitch length is presented which is based on the age-specific size and performance of the bowlers and batters. The objective was a pitch length which enabled young bowlers to bowl good length deliveries while releasing the ball at a more downward angle, similar to elite bowlers. The steeper release angle has the benefit of reducing the sensitivity of the ball flight distance to the variability of ball release. Based on data from county standard under-10 and under-11 players a pitch length of 16.22 yards (14.83 m) was calculated, 19% shorter than previously recommended for under-11s in England. A shorter pitch also increases the temporal challenge for batters, encouraging a wider variety of shots and improved anticipation skills. Pitch lengths scaled in this way to fit the players’ abilities as they develop will enable a more consistent ball release by bowlers and more consistent temporal demand for batters.     

Adolescent exposure to violence and adult illicit drug use

Informed by a strain theory perspective, this study utilizes data on adolescent exposure to violence (AEV) from a prospective, longitudinal, national household probability sample that originally consisted of 1,725 respondents, first interviewed as adolescents in 1977 and last interviewed in middle adulthood in 2003. Findings from bivariate correlations and logistic regression models indicate that AEV is associated with both adolescent and adult illicit drug use, but some of the association between AEV and adult illicit drug use becomes nonsignificant when controlling for adolescent illicit drug use. Specific types of AEV associated with adult illicit drug use differ by gender. Implications, limitations, and future research directions are discussed.     

浅析戒毒康复者的意志力训练

为了帮助戒毒康复者摆脱毒品困扰,恢复正常生活,本文阐述了戒毒康复者的意志力在戒毒康复过程中的重要意义,并提出了训练和强化戒毒康复者意志力的方法。通过强化戒毒康复者戒毒康复的内部动机,提高戒毒人员意志力,加强戒毒康复者的自控能力和抗诱惑能力,帮助戒毒康复人员摆脱毒品的诱惑。     

张力索网结构零应力态与预应力态计算方法

研究目的：减小张力索网结构所求实际预应力与预期预应力之间的差异,并更完善地描述结构力学行为。创新要点：提出张力索网结构全过程分析概念,并用10个状态描述了其物理或分析的状态,以及15个过程揭示了状态间内在的逻辑关系和力学分析理论;在应力释放分析中,采用逆分析法提出了一种用于求解合理零应力状态的迭代计算方法;在预应力成形分析中,为获取预应力状态建立了另一种迭代计算方法。研究方法：应力释放分析主要包括四个步骤：构件无应力长度及伸长量计算,最小范数最小二乘法,数值迭代方法,和执行程序（图4）;预应力成形分析在能量方程的基础上提出了控制方程的显式表达式,并为避免初始刚度矩阵的奇异问题而采用了合理自应力模态（图5）。重要结论：比较本文提出的计算方法与动力松弛法得到的零应力态,发现结果吻合良好,证明计算过程收敛性良好且结果准确。在预应力成形分析中,采用本文迭代方法可以有效消除所求实际预应力与预期预应力之间的差异。此外,提出的所有计算方法都符合模块化流程,具有广泛适用性。