混凝土裂缝产生的原因及预防措施

分析混凝土结构塑性收缩裂缝，塑性沉降裂缝，温度裂缝的原因及预防措施。     

大学生激情犯罪的预防浅析

当前大学生激情犯罪较为突出,在大学生犯罪中所占的比例较大,对社会造成很大的危害。从大学生激情犯罪的内涵、原因入手,提出了预防大学生激情犯罪的措施,希望能对抑制或减少大学生激情犯罪有所帮助。     

轮滑教学中造成运动损伤的原因及其预防

作为一项新兴时尚运动,轮滑进入课堂也只是近几年的事.因为该项运动的特点,学生在运动中极易受伤.针对这一现状,作者对怀化学院04、05级选修轮滑课学生运动损伤的情况进行了调查,认为不能掌握正确的运动技术、准备活动不充分、场地器材的质量较差、身体机能欠佳是发生运动损伤的主要原因,并针对上述原因提出了相关的预防措施.     

健美操运动损伤之初探

近年来，我国健美操运动如雨后春笋迅速发展，但起步较晚，又受物质条件及其科研工作滞后等因素影响；训练中常出现各种损伤，影响了运动技术水平的提高和受训学生的身心健康，通过对武汉体院122名健美操专选班学生参加健美操训练的调查，探索研究了健美操运动损伤规律及预防措施，为受训学生创造最佳成绩，最大限度延长其运动年限，减少伤病事故发生，以及为体育院校顺利完成健美操专业训练课程及其选修课程提供参考依据。     

Investigation of iodine concentration in salt,water and soil along the coast of Zhejiang,China

Objective: We aim to describe the environment iodine concentration in salt, water and soil along Zhejiang Province coast in the China foreland. It will be helpful for us to judge whether this area is insufficient in iodine and universal iodized salt is necessary or not. Methods: We collected iodized salt samples, drinking water samples (tap water in the towns, and well water or spring water in the villages), water samples from different sources (ditches, lakes, rivers) and soil samples through random sampling in June, 2005. Salt, water and soil iodine was detected by arsenic-cerium redox method. Statistical analysis was expressed as mean±SEMby Windows SPSS 13.0. Results: (1) The iodine concentration in salt was 27.9±4.33 mg/kg (n=108). (2) Seventy-five water samples were collected. The water iodine value was 0.6～84.8 μg/L (mean of 11.66 μg/L). The watershed along the Qiantang River has significantly higher iodine content than the water in Lin'an in mountain area (P＜0.01). The iodine content and mean iodine content of tap water, well or spring water and natural water sources were 4.30±2.43 μg/L (n=34), 23.59±27.74 μg/L (n=19)and 12.72±10.72 μg/L (n=22) respectively. This indicated that among environmental water sources, the ditch iodine content was the highest with river water iodine being the lowest (P＜0.01). (3) Soil iodine value was 0.11～2.93 mg/kg (mean of 1.32 mg/kg).Though there was no statistical difference of soil iodine in different districts (P=0.131), soil iodine content correlated positively with water iodine content. Conclusion: Iodine concentration in salt accords with national policy of adding iodine in salt. Foreland has more iodine in water than mountain area. The data reflected that water and soil iodine in foreland area was not high, which suggests universal iodized salt should be necessary. Environment iodine has relatively close association with pollution.     

循环流化床锅炉结焦的预防措施

循环流化床锅炉技术是近十几年迅速发展起来的一项高效、清洁燃烧技术.随着大量的循环流化床锅炉投入生产运行,循环流化床锅炉的运行特点逐渐为大家所掌握.但由于其固有的一些特点,运行中仍经常出现问题.结焦就是循环流化床锅炉运行中较为常见的故障,它直接影响到锅炉的安全经济运行.笔者根据几年来的流化床锅炉调试和运行经验,谈谈关于预防循环流化床锅炉结焦的一些体会,供循环流化床锅炉运行人员参考.     

正确认识和预防“非典”

1.什么是传染性非典型肺炎? 非典型是相对典型而言.根据患肺炎病人的临床表现,医学诊断上将其分为典型肺炎和非典型肺炎.     

楼层渗水原因及预防措施

有水楼层，主要是厨房，卫生间渗漏是一个长期存在的质量通病，在设计，施工及安装方面应采取措施。     

套塑膜袋苹果日灼病发生原因及预防措施

苹果日灼病是一种常发性生理病害,近年来在套塑膜袋果园发生严重,其主要原因是套塑膜袋苹果的果面温度较未套袋苹果提高4～5℃,气温骤升加速并加重其发病.采取避开气温骤升期套袋,并加强肥水管理,提高树势等措施,可使日灼果率降到2%以下.     

体育教学中伤害事故原因分析及预防措施

体育教学由于其学科的特殊性，学生伤害事故时有发生，虽然教育部颁布的《学生伤害事故处理办法》(以下简称《办法》)已对处理伤害事故提供政策依据，但作为体育教育工作者，不能认为有《办法》可依，一切就可以高枕无忧，而是应当认真探究引发事故的原因，采取有效措施，防患于未然才是最重要的。