西部大开发战略的经济学思考     

李东海  孟丽 《西北师大学报》2001,38(3):114-118

西部大开发战略的提出标志着我国经济发展战略的重大转变,也是实现经济均衡发展的重要举措,如何实现西部经济快速起飞,关键在于实现三个转变：经济发展战略从“梯度推移论”到西部跳跃发展;经济发展环境从偏向沿海地区向西部地区转移;经济发展重点从城市偏向改革到注重农村市场开拓。  相似文献   

First-rib stress fracture in two adolescent swimmers: a case report     

Sara Low  Michael Kern 《Journal of sports sciences》2016,34(13):1266-1270

First-rib stress fractures have been described in adolescent athletes in various sports, with only one prior case report of first-rib stress fractures in an adolescent female swimmer. There is a need for research on the cause, management, and prevention of these injuries as they lead to significant morbidity and critical time away from sport for these aspiring athletes. We aimed to describe first-rib stress fractures as a potential cause for non-specific atraumatic chronic shoulder pain in adolescent swimmers and to discuss the different presentations, unique risk factors, treatment, and potential injury prevention strategies of such fractures. We discussed two such cases which were successfully treated with activity modification with restriction of all overhead activity, gradually progressive physical therapy and a return to swimming protocol. First-rib stress fractures can vary in presentation and should be in the differential diagnosis in adolescent swimmers with chronic shoulder pain. These injuries can be successfully managed with rest from overhead activities and physical therapy. Gradual return to competitive swimming can be achieved even with non-union of a first-rib stress fracture. Emphasis on balanced strength training in different muscle groups and proper swimming technique is essential to prevent these injuries.  相似文献   

低温胁迫下镧对水稻种子萌发的影响   总被引：3，自引：0，他引：3  

刘惠娜  钟东方  许良政 《嘉应学院学报》2007,25(3):72-76

以水稻(Oryza sativa)种子为实验材料,研究了不同浓度稀土元素镧浸种对水稻种子低温萌发的影响。结果表明:15℃低温胁迫抑制水稻种子的萌发,浸种期用硝酸镧处理能够提高种子的抗逆性。低浓度((50~250)×10-6mol/L)硝酸镧浸种能提高水稻种子发芽率、发芽势、呼吸速率和过氧化氢酶活性,提高种子抗寒能力,实验发现用硝酸镧处理种子萌发以250×10-6mol/L浓度为最佳,低温胁迫下,发芽率提高9.67%,呼吸速率提高56.25%,过氧化氢酶活性提高1.73%。350×10-6mol/L以上高浓度对水稻种子的萌发无明显影响。  相似文献   

Effect of repeat-sprint training in hypoxia on post-exercise interleukin-6 and F2-isoprostanes     

Paul S. R. Goods  Brian Dawson  Grant J. Landers  Christopher J. Gore  Kevin Croft  Peter Peeling 《European Journal of Sport Science》2016,16(8):1047-1054

This investigation examined the oxidative stress (F₂-Isoprostane; F₂-IsoP) and inflammatory (interleukin-6; IL-6) responses to repeat-sprint training in hypoxia (RSH). Ten trained male team sport athletes performed 3(sets)*9(repetitions)*5?s cycling sprints in simulated altitude (3000?m) and sea-level conditions. Mean and peak sprint power output (MPO and PPO) were recorded, and blood samples were collected pre-exercise, and again at 8 and 60?min post-exercise. Both MPO and PPO were significantly reduced in hypoxia (compared to sea-level) in the second (MPO: 855?±?89 vs. 739?±?95?W, p?=?.006; PPO: 1024?±?114 vs. 895?±?112?W, p?=?.010) and third (MPO: 819?±?105 vs. 686?±?83?W, p?=?.008; PPO: 985?±?125 vs. 834?±?99?W, p?=?.008) sets, respectively. IL-6 was significantly increased from pre- to 1?h post-exercise in both hypoxia (0.7?±?0.2 vs. 2.4?±?1.4?pg/mL, p?=?.004) and sea-level conditions (0.7?±?0.2 vs. 1.6?±?0.3?pg/mL, p?d?=?0.80) suggesting higher IL-6 levels of post-hypoxia. F₂-IsoP was significantly lower 1?h post-exercise in both the hypoxic (p?=?.005) and sea-level (p?=?.002) conditions, with no differences between trials. While hypoxia can impact on exercise intensity and may result in greater post-exercise inflammation, it appears to have little effect on oxidative stress. These results indicate that team sport organisations with ready access to hypoxic training facilities could confidently administer RSH without significantly increasing the post-exercise inflammatory or oxidative stress response.  相似文献   

水分胁迫下亚精胺对小麦幼苗蛋白质含量与蛋白酶活性的影响   总被引：1，自引：0，他引：1  

段辉国  黄作喜  卿东红  齐泽民 《内江师范学院学报》2006,21(2):69-72

研究了水分胁迫下亚精胺对小麦幼苗相对含水量、叶绿素总量、蛋白质含量和蛋白酶活性的影响。结果显示,亚精胺预处理延缓水分胁迫下小麦幼苗叶片含水量、叶绿素含量和蛋白质含量的下降,抑制蛋白酶活性的上升。表明亚精胺预处理对水分胁迫的小麦幼苗具有防衰抗旱的保护作用。  相似文献   

烟囱倾倒时最容易断裂的位置     

肖庆华 《重庆职业技术学院学报》2004,13(1):99-100

烟囱倾倒过程中,通过对横截面上切应力及拉伸(压缩)应力的计算,确定了倾倒时烟囱被破坏的主要力学原因及表现是,在外侧强大的拉应力作用下,烟囱从外侧开始被拉断.  相似文献   

Social Work Intervention with White Collared Employees and Their Families     

Y.?S.?SiddeGowdaEmail author 《International journal for the advancement of counseling》2004,26(4):421-432

This investigation presents a framework for understanding and also to test the efficacy of Social Work intervention on the well being of the white collared employee (industrial employee) and his/her family. A comprehensive and intensive personal- family exploration was done to uncover the relatedness of seemingly disparate areas of the clients lives. A total of 80 executives (industrial employees) served as subjects. A baseline assessment was done using structured, standardized interview-schedules/questionnaires. The results of the study can be enumerated as follows: After the Social Work intervention, the executives in occupational profile, there were significant changes in Role perception, overload, role conflict, low status and poor peer relations. In coping strategies there was significant improvement in sub-scales like problem solving and unproductive coping. Significant reduction was noticed in their proneness to heart disease, depression, inadequate mental mastery, and perceived ill health. There was significant improvement in their family group support, and in their expressiveness, achievement, orientation, active-recreational and organizational characteristics.  相似文献   

弧形混凝土结构温度应力计算研究     

黎永索  卫军 《湖南城市学院学报》2003,24(6):10-13

对弧形混凝土结构温度应力的计算研究表明，弧形结构的环向应力沿高度方向基本一致，可以简化为拱单元计算，拱单元的支座约束可以用“等效暗柱”来计算；结构两侧温差对弧形结构的环向应力的影响较轴线温差变化的影响更大，控制温度裂缝主要是控制结构物两侧的温差．通过设置滑动层，减小结构的抗侧移刚度。则弧形混凝土结构可以作无缝设计．  相似文献   

大体积混凝土温度应力造成裂缝的控制     

ZHENG You wei 《福建工程学院学报》2001,(Z1)

分析大体积砼温度裂缝 ,提出降低温度应力、防止大体积砼裂缝几项措施  相似文献   

聚合物多元醇改善普通聚氨酯软泡压陷的性能研究     

王玫瑰 《广东轻工职业技术学院学报》2002,1(2):29-30

为了改善普通聚氨酯软泡的压陷性能，采用添加聚合物多元醇，并对照其添加前后的物性。研究结果表明：聚合物多元醇能有效地提高聚氨酯软泡的压陷性能。  相似文献