共查询到19条相似文献，搜索用时 296 毫秒
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杨安中 《安徽科技学院学报》1995,(4)
在缺硼上壤上进行秦油２号移栽穴内底施硼肥（６．０—１８．０ｋｇ·ｈｍ－２硼砂）和蕾苔期喷施硼肥（１．５—７．５ｋｇ·ｈｍ－２硼砂）试验。结果表明：移栽穴内底施硼肥以施用１５ｋｇ·ｈｍ－２硼砂增产幅度最大，增产达４８７．５ｋｇ·ｈｍ－２，增幅２０．１％；蕾苔期喷施以施用４．５ｋｇ·ｈｍ－２硼砂增产幅度最大，增产达２６５．５ｋｇ·ｈｍ－２，增幅１１．０％；“花而不实”诛率、裂茎株率均随施硼砂量的增加而下降，菌核病发生率与硼肥用量无关。 相似文献
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中草药对奶牛隐性乳房炎的治疗效果观察 总被引：2，自引：0，他引：2
选择皖南地区某奶牛场106头奶牛进行乳房炎流行病学调查。应用SMT诊断液对奶牛奶样进行检测，发现59头奶牛具有隐性乳房炎，其发病率达55．66％。应用中草药组方研制的中药超细散剂“消炎增乳散”对奶牛隐性乳房炎进行治疗。消炎增乳散混入饲料中喂服，每天200g，3天为一个疗程。对照组不使用药物预防和治疗。结果表明中药制剂“消炎增乳散”对奶牛隐性乳房炎的治疗愈为72．2％。 相似文献
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计表２数学教师计算机知识的掌握、使用情况表１学校设备配置情况３８６计算机４８６计算机５８６以上的计算机校园网络３１．１％４２．９％２６％元计算机知识掌握情况使用计算机的情况没有掌握能进行简单的文字处理能编写公式处理表格与数据能制作简单的课件几乎每天都用学计算机时用过偶然用过几次没用过１７人２６人２人３人２人１６人１６人１４人３５．４％５４．１％４．２％６．３％４．２％３３．３％３３．３％２９．２％算机辅助教学（ＣＡＩ）开始在我们的中学教育中实施应用,并产生了巨大的影响。为了了解当前中学数学ＣＡＩ… 相似文献
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整式乘除运算和整式加减运算一样，是代数式运算的基础，也是初中阶段一项重要的基本计算技能．熟练、准确地进行整式的混合运算，可为进一步地学习其他知识打下扎实的基础．本文着重介绍一些典型的有关整式乘除的综合应用问题，希望能对学学习有所帮助．□江苏例１已知３x＋１·２x－３x·２x＋１＝３６，求x．分析：若两个幂相等，且它们的底相同，则指数一定相等．在这里，可考虑先将底化为相同，再比较其指数．解：∵３x·２x（３－２）＝３６，６x＝３６，６x＝６２，所以x＝２．例２已知多项式A与（x－１）２的乘积为x３－３x２＋kx… 相似文献
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成立群 《河南职业技术师范学院学报》1997,25(2):28-30,40
通过连续三年对新乡市耕土壤养分动态监测结果表明，土壤有机质、速效磷、速效钾含量逐年下降，其中东部四县分别下降０．０３４２５％、２．５８７５和０．８８７５ｐｐｍ，中西部五县市分别下降０．１２４％、２．０１和３．３９ 相似文献
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１．在图１所示的盛水容器中,Ａ、Ｂ、Ｃ、Ｄ、Ｅ各点受到水的压强分别为ρＡ、ρＢ、ρＣ、ρＤ、ρＥ,将各点受到水的压强从大到小排列,应是２．在水平地面上放着一块底面积为Ｓ、高为ｈ的长方体铁块,现把它锻打成一个高为ｈ／２的圆柱体,竖放在水平面上,它对地面的压强是原来的倍。３．如图２,甲、乙、两三个容器中盛有三种不同的液体,它们的密度之比为１．８：１．２：１．质量之比为３：２：１．若三个容器底面积相同,且液体的深度相同,则容器底面积受到液体的压强之比为＿＿,压力之比为＿．４．履带式拖拉机的履带是用一块… 相似文献
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目前，我国高校毕业生的就业问题，成为全社会的关注焦点。据347所高职高专院校的人效数据统计，截止2003年月12月底高职高专毕业生就业率平均为87．6％，未就业率为11．7％，不就业率平均为0．7％。另外2003年12月底与6月底高职高专男女生的就业比，调查统计分别为：1．22：1与1．29：1。 相似文献
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目的寻求一种能够有效地保存乳牙生活根髓,提高活髓切断术成功率的方法．方法：选择102只患牙用2％戊二醛固定根髓断面后用含戊二难之盖髓剂盖髓,然后充填并观察半年至1年疗效,结果术后半年成功率为97．1％,术后1年成功率为95．7％,结论2％戊二醛法活髓切断术可大量替代神剂失活干尸术．具有操作安全,疗程缩短为一次等优点。 相似文献
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Guido Makransky Philip Havmose Maria Louison Vang Tonny Elmose Andersen Tine Nielsen 《高等教育研究与发展》2017,36(5):1003-1016
The aim of this study was to evaluate the predictive validity of a two-step admissions procedure that included a cognitive ability test followed by multiple mini-interviews (MMIs) used to assess non-cognitive skills, compared to grade-based admissions relative to subsequent drop-out rates and academic achievement after one and two years of study. The participants consisted of the entire population of 422 psychology students who were admitted to the University of Southern Denmark between 2010 and 2013. The results showed significantly lower drop-out rates after the first year of study, and non-significant lower drop-out rates after the second year of study for the admission procedure that included the assessment of non-cognitive skills though the MMI and the admissions test. Furthermore, this admission procedure resulted in a significant lower risk of failing the final exam after the first and second year of study, compared to the grade-based admissions procedure. Finally, students admitted through the MMI and the admissions test scored significantly higher on academic learning self-efficacy and critical thinking compared to students selected by grades. The implications for higher education admissions are discussed. 相似文献
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刘金铃 《福建工程学院学报》2011,9(1)
分析建筑现浇板由混凝土收缩和温差共同作用引起上下贯穿裂缝的产生机理,通过微元体建立建筑外周粱与室内板间的静力平衡关系,导出以混凝土极限收缩应变值ε反映混凝土材料质量影响的外梁温差应力计算公式,提出建筑现浇板预控贯穿裂缝的强度计算式及施工过程与使用过程的预控措施. 相似文献
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对42人47颗早期牙隐裂患牙,用作者提出的综合方法治疗后定期追踪2年以上,观察结果:总的牙齿保存率为95.74％,其中有26例患牙功能良好,临床检查和牙髓活力正常,结果提示:38.30％的早期牙隐裂患牙,其隐裂继续加深和开髓病变的发生均不易控制,宜及早做牙髓治疗和全冠修复。 相似文献
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Child Abuse and Neglect (CAN) is an important problem both in Turkey and worldwide. Unfortunately, we still don’t have enough and reliable data on this important subject. In this study, we aimed to investigate the prevalence of childhood maltreatment in a population of first year medical students in a Turkish university using the retrospective version of the ISPCAN Child Abuse Screening Tool (ICAST-R). One hundred seventy three first year medical students, aged between 18 and 24 years, who agreed to complete the ICAST-R questionnaire, were recruited in our study. Of 173 students who completed the survey, 51.4% are found to be subjected to at least one type of child abuse (physical, emotional or sexual). The prevalence is higher in male gender and the difference is statistically significant. Physical, emotional and sexual abuse exposure rates are found to be 23.1%, 40.5% and 11% respectively. Physical and emotional abuse rates are higher in male gender and the difference is statistically significant. We did not find any statistically significant association between gender and sexual abuse. Efforts to prevent child abuse and neglect are growing in our country, as they are worldwide. However, child abuse is still common and a problematic issue. It is important to determine the prevalence of child abuse in order to raise awareness. We need further studies investigating not only prevalence but also risk factors to have reliable data for our country. 相似文献
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The current study investigated whether the quality of school anti-bullying policies allows the drawing of any conclusions about the extent of bullying problems in schools. That is, do schools with a more detailed anti-bullying policy have lower rates of bullying? A total of 2377 children in primary schools (six year olds/year two: 1072; eight year olds/year four: 1305) were individually interviewed using a standard interview about bullying experiences. A detailed content analysis scheme that closely followed the core whole-school intervention approach was carried out on a total of 34 schools: 24.5% of the children reported being directly victimised very frequently and 45.9% reported being relationally victimised frequently or very frequently. No correlation between the content and quality of anti-bullying policies and the prevalence of direct bullying behaviour was found. Conversely, an inverse relationship was found for relational bullying behaviour: schools with the most detailed and comprehensive anti-bullying policies had a higher incidence of relational bullying and victimisation behaviour. Inspection of school anti-bullying policies per se provides little guide to the actual amount of direct bullying behaviour in schools. 相似文献
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This random assignment impact study of Big Brothers Big Sisters School-Based Mentoring involved 1,139 9- to 16-year-old students in 10 cities nationwide. Youth were randomly assigned to either a treatment group (receiving mentoring) or a control group (receiving no mentoring) and were followed for 1.5 school years. At the end of the first school year, relative to the control group, mentored youth performed better academically, had more positive perceptions of their own academic abilities, and were more likely to report having a "special adult" in their lives. However, they did not show improvements in classroom effort, global self-worth, relationships with parents, teachers or peers, or rates of problem behavior. Academic improvements were also not sustained into the second school year. 相似文献
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J E McCarroll J H Newby L E Thayer R J Ursano A E Norwood C S Fullerton 《Child abuse & neglect》1999,23(9):855-861
OBJECTIVE: To examine trends by year in reports of victims of child maltreatment in the US Army Central Registry (ACR) during the period 1975-97. We report the rates/1,000 children of Army families of initial substantiated cases from 1988-97 and the number of cases of maltreatment as a percentage of total victims for each year from 1975-97. Army data are compared to published reports from military service child abuse registries. METHODS: Numbers of cases of child maltreatment for each year were obtained from the ACR for major, minor, and total physical abuse, sexual abuse, emotional abuse, and neglect. Population figures for numbers of children were obtained from the Defense Manpower Data Center. RESULTS: The rates/1,000 for neglect have decreased by 24% from 1991-97, although the decrease has not been steady. The rates/1,000 of minor physical abuse declined 28% from 1993-97. The rates/1,000 of major physical abuse were basically unchanged from 1988-96, although the highest rate was recorded in 1997. The rates/1,000 of sexual abuse were also basically unchanged with the exception of increases in 1992-94 after which time the rates/1,000 returned to the pre-1992 levels. The rates/1,000 of emotional abuse cases more than doubled from 1988-97. CONCLUSIONS: While minor physical abuse and neglect have shown decreases over the past decade, major physical abuse has remained virtually unchanged and sexual and emotional abuse have shown fluctuations. All these forms of maltreatment are challenges to the Army Family Advocacy Program. 相似文献