[Choice of medical treatment for renal colic: A survey of Chinese urologists]. [PDF]
Beijing Da Xue Xue Bao Yi Xue Ban, 2023 Wang MR +8 more
europepmc +1 more source
, 2014 [目的]了解中国学术期刊对机构知识库存缴政策的态度。[方法]从《中国科技期刊引证报告》中选择326个样本， 以电话通知的方式， 确保他们进行线上问卷调查。[结果]回收有效问卷195份， 回收有效率为65%强。其中， 74.9%的期刊赞同论文存储到机构知识库中。说明他们对机构知识库存储和传播科技论文的态度和建议是正面的。[局限]总体调查规模有限， 集中在质量较高、名声显著、已有期刊数字化基础的期刊， 调查结论未必适用于全部中国期刊。[结论]多数调查对象赞成机构知识库存缴与传播论文 ...
张晓丹 +4 more
core
[An investigation study on the technology and training level of ski patrol]. [PDF]
Beijing Da Xue Xue Bao Yi Xue BanBai P +7 more
europepmc +1 more source
[Associations between early onset of puberty and obesity types in children: Based on both the cross-sectional study and cohort study]. [PDF]
Beijing Da Xue Xue Bao Yi Xue Ban, 2022 Ma T +11 more
europepmc +1 more source
[Cross-century process of mental health surveys in China]. [PDF]
Beijing Da Xue Xue Bao Yi Xue BanHuang J, Liu Z, Zhang T, Huang Y.
europepmc +1 more source
, 2004 利用遥感信息进行国土资源调查,调查费用与调查精度是一对矛盾,而空间抽样提供了解决:这对矛盾的方法.针对空间抽样问题先验数据缺乏及受多因素影响的复杂情况,在前人方法单一且缺乏比较的应用模型基础上,提出空间抽样优化决策模型,该模型是经探索分析后采用多种可能组合方法获取精度变化图,多次实验回归模拟,归一化到同一坐标系中,采用离散化的决策函数计算比较得到抽样优化决策方案.通过遥感耕地调查的实验,结果表明用航片进行细小地物及耕地面积调查,Sandwich方法能较好实现投入与精度的平衡组合 ...
李连发, 王劲峰, 刘纪远
core
[A population-based survey of myopia on primary school students in an administrative district, 2019 to 2024]. [PDF]
Beijing Da Xue Xue Bao Yi Xue BanYang M +8 more
europepmc +1 more source
[The investigation on the acute, severe hepatitis of unknown origin in children]. [PDF]
Zhongguo Dang Dai Er Ke Za Zhi, 2022 Yao KH, Meng QH, Yu D.
europepmc +1 more source
[Survey on physical development and nutritional status of children aged 3-6 years in Urumqi City, 2018-2024]. [PDF]
Zhongguo Dang Dai Er Ke Za ZhiGuo YJ, Gao G, Zhao Z, Zhang DX.
europepmc +1 more source
[Nursery Services for Children Under 3 in Sichuan Province]. [PDF]
Sichuan Da Xue Xue Bao Yi Xue Ban, 2023 Zhao L +6 more
europepmc +1 more source