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排序方式: 共有97条查询结果,搜索用时 15 毫秒
1.
目的探讨基于雨课堂的翻转课堂混合式教学模式在影像设备学X线课程中的应用效果。方法选取开设医学影像设备学课程学生135名,随机分成传统教学组、翻转课堂联合传统教学组、基于雨课堂的翻转课堂联合传统教学组,每组45名。每个组别使用相应的教学方式,结束教学后,通过调查问卷及理论知识测验等形式对教学效果进行评价。结果基于雨课堂的翻转课堂联合传统教学组理论成绩高于翻转课堂教学组、传统教学组,差异有统计学意义(P<0.05)。基于雨课堂的翻转课堂联合传统教学组、翻转课堂教学组理论成绩均高于传统教学组,差异有统计学意义(P<0.05)。结论基于雨课堂的翻转课堂的混合式教学模式在影像设备学X线课程教学中应用有良好的效果。  相似文献   
2.
To promote artificial rain in India and other such developing countries, in this article, we have proposed and analyzed a nonlinear mathematical model for cloud seeding by considering that aerosols are introduced proportional to the density of water vapors present in the atmosphere. The model is analyzed using Lyapunov's stability theory of differential equations. To reduce the cost of cloud seeding, an optimal control strategy is designed by incorporating four control parameters. We have shown the existence and uniqueness of solution of this optimal control problem, using Pontryagins Maximum Principle. To minimize the cost in making artificial rain, the optimal control problem provides the strategy for the rate of introduction of aerosols in the atmosphere. To capture the effects of environmental noise on control strategies, the model in deterministic framework is converted into stochastic framework. In this regard, the Hamilton-Jacobi-Bellman equation for stochastic control cost function has been formed. The stochastic analysis implies that the control strategy is effective in reducing the cost and increasing rainfall.  相似文献   
3.
经筋刺法治疗难治性周围性面神经麻痹临床观察   总被引:1,自引:0,他引:1  
目的 研究以石学敏教授"经筋、皮部"理论为指导的经筋刺法对难治性周围性面神经麻痹患者面部功能的改善作用.方法 将20例难治性周围性面神经麻痹的患者随机分为两组,治疗组与对照组各10例.对照组予普通针刺治疗,治疗组予经筋刺法治疗.治疗前及治疗后采用House-Brackmann分级量表进行评价分级,并比较两组患者临床疗效.结果 治疗组总有效率(90.0%)均优于对照组(80.0%),两组比较,差异有统计学意义(P<0.05).治疗组House-Brackmann分级量评分的改善优于对照组.结论 以石学敏教授"经筋、皮部"理论为指导的经筋刺法对难治性周围性面神经麻痹面部功能具有良好的改善作用.  相似文献   
4.
目的为了解北京市居民遭遇特大暴雨后,在既往健康教育工作及此次短期、密集、全覆盖的健康教育工作下,居民健康教育效果及需求,开展此次调查,进一步为制定防病措施提供依据。方法采用整群随机抽样的方法,通过北京公共卫生热线(12320)电话调查系统收集数据,对1232名北京市居民进行电话调查,包括一般情况、健康知识、信念、行为和健康传播需求相关内容。采用单因素分析和多因素非条件Lo—gistie回归分析。结果北京市暴雨影响地区居民正确的健康知识知晓率均高于80%,信念和行为具备率分别为90.9%和90.7%。直接受暴雨影响居民在防传染病和灾难逃生技巧信息两方面需求率(48.3%和42.6%)高于不直接受影响居民(37.4%和34.9%),差异有统计学意义。对需求率最高的防传染病知识进行Logistic回归分析提示:其影响因素包括年龄、文化程度及直接受暴雨影响(OR=0.72、0.69和1.59)。电视是居民主要的信息渠道(79.7%),主要的影响因素为年龄(OR=0.44)。结论北京市居民的健康教育工作效果突出,在保证大灾之后无大疫中发挥了不可或缺的作用。后期工作应着重结合居民防疫知识现况,调整健康教育重点内容与策略。  相似文献   
5.
Episodic acidification resulting in increased acidity and inorganic aluminum (Ali) is known to interfere with the parr-smolt transformation of Atlantic salmon (Salmo salar), and has been implicated as a possible cause of population decline. To determine the extent and mechanism(s) by which short-term acid/Al exposure compromises smolt development, Atlantic salmon smolts were exposed to either control (pH 6.7–6.9) or acid/Al (pH 5.4–6.3, 28–64 μg l−1 Ali) conditions for 2 and 5 days, and impacts on freshwater (FW) ion regulation, seawater (SW) tolerance, plasma hormone levels and stress response were examined. Gill Al concentrations were elevated in all smolts exposed to acid/Al relative to controls confirming exposure to increased Ali. There was no effect of acid/Al on plasma ion concentrations in FW however, smolts exposed to acid/Al followed by a 24 h SW challenge exhibited greater plasma Cl levels than controls, indicating reduced SW tolerance. Loss of SW tolerance was accompanied by reductions in gill Na+,K+-ATPase (NKA) activity and Na+,K+,2Cl (NKCC) cotransporter protein abundance. Acid/Al exposure resulted in decreased plasma insulin-like growth factor (IGF-I) and 3,3′,5′-triiodo-l-thyronine (T3) levels, whereas no effect of treatment was seen on plasma cortisol, growth hormone (GH), or thyroxine (T4) levels. Acid/Al exposure resulted in increased hematocrit and plasma glucose levels in FW, but both returned to control levels after 24 h in SW. The results indicate that smolt development and SW tolerance are compromised by short-term exposure to acid/Al in the absence of detectable impacts on FW ion regulation. Loss of SW tolerance during short-term acid/Al exposure likely results from reductions in gill NKA and NKCC, possibly mediated by decreases in plasma IGF-I and T3.  相似文献   
6.
从伤寒的体质、病因、病理、诊法、辨证、治则、治法、方药及其临床等方面对《伤寒论》研究层面进行分析,对《伤寒论〗研究思路、方法及未来研究发展趋势进行了讨论。  相似文献   
7.
This immunohistochemical study compares the expression of stress-response (heat-shock) protein (srp) 72, srp 27, αB-crystallin and ubiquitin in 86 primary human brain tumours and 21 carcinoma metastases to the central nervous system. Normal brain tissues were included for control purposes. Serial sections of formalin-fixed, paraffin-embedded tissues were used. Most meningiomas (17/23), glioblastomas (11/12) and breast carcinoma metastases (9/10) and some astrocytomas (7/13), pituitary tumours (4/9) and lung cancer metastases (5/11) had tumour cells that reacted with one or more of the antibodies used. Around 43% of the meningiomas and 25% of the glioblastomas expressed srp 72 only. Sole expression of srp 2 7, αB-crystallin or ubiquitin was seen in several tumours. Some meningiomas (3/23) and breast cancer metastases (4/10) co-expressed srp 72 and srp 27, and 1/3 of the glioblastomas co-expressed srp 27 and αB-crystallin. We conclude that primary and metastatic tumours of the brain produce stress-related proteins and that certain tumours concurrently express two or more srp's.  相似文献   
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10.
目的建立春雨烧伤凝胶剂中盐酸小檗碱含量测定的高效液相色谱法。方法色谱柱为Kromasil C18柱(4.6mm×250mm,5μm),流动相为乙腈-1%H3PO4-三乙胺(24∶76∶0.76),检测波长:345nm,流速:1.0mL/min,柱温:30℃。结果盐酸小檗碱在0.088~0.440μg(r=0.9997)之间具有良好的线性关系,平均回收率为98.13%,RSD=0.77%(n=6)。结论该法检测快速,精密度高,重现性好,可用于春雨烧伤凝胶剂的定量分析。  相似文献   
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