Results 101 to 110 of about 1,130,778 (144)

Effect of soil and water conservation on runoff and sediment in Pianguan River

, 2005
偏关河流域水土保持面积从1959年的1万1593hm2增加到1996年的5万5338hm2,占流域面积的28.90%。年径流量、常水径流量与年份和各类水土保持措施之间,均呈极显著负相关,年径流量与年降水量、汛期降水量和有效降水量,均呈显著正相关,而常水流量与年降水量、汛期降水量和有效降水量关系很弱;偏关河流域小型蒸发器测定的蒸发量与年份呈显著负相关,但径流和泥沙变化并没有增加,说明水土保持是引起径流量和泥沙量变化的主要原因。洪水径流量、年输沙量和洪水输沙量变化一致,与年降水量 ...
穆兴民, 张晓萍, 王飞, 李锐
core  

AISSA-Optimized Transformer Model for Sediment Concentration Prediction in Multi-Sediment Reservoir

工程科学与技术
为解决入库含沙量时间序列在剧烈波动和极端高值频发情形下建模精度不足的问题，提出一种面向多沙水库入库含沙量预测的 AISSA-Transformer 模型。该模型在 Transformer 的基础上，提出分布敏感自适应损失函数，根据样本分布自适应调整误差权重，增强对极端高含沙样本和突发峰值的预测能力；同时，改进麻雀搜索算法，通过混沌映射初始化、动态权重更新和多分布扰动机制，实现超参数全局优化并提高收敛稳定性。以小浪底水库 1998—2024 年入库含沙量及相关水沙与调度数据为研究对象，开展不同损失函数 ...
LI Ke, LI Tao, WANG Min, CUI Pei, GUO Ye, ZHU Binhao   +5 more
doaj  

[Determination of 38 antibiotic residues in honey by magnetic dispersive solid-phase extraction-liquid chromatography-tandem mass spectrometry]. [PDF]

Se Pu
Sun J, Zhang Y, Liu FM, Zhao W, Jin Y, Zhang L, Xue XF, Chen R, Zhou HT.   +8 more
europepmc   +1 more source

塔中春季水平能见度变化及影响因子分析

, 2008
利用2004、2005年3月至5月塔克拉玛干沙漠腹地塔中气象站的能见度仪自动监测资料,气温、气压、风速、相对湿度等地面气象常规沙尘观测记录以及PM10自动监测仪观测资料,分析了塔中水平能见度变化特征以及与气象因子、PM10的相关关系,气象因子与PM10对水平能见度有一定的制约关系,但并非简单的线形关系,不同时段,不同天气条件下 ...
陆辉, 魏文寿, 刘明哲
core  

[Preliminary evaluation of the efficacy and safety of telitacicept in children with IgA nephropathy]. [PDF]

Zhongguo Dang Dai Er Ke Za Zhi
Chen J, Yu XX, Shi XS, Chen B, Wu S, Zhong RR.   +5 more
europepmc   +1 more source

[Development and reliability and validity testing of the Medication Literacy Scale for patients with chronic heart failure]. [PDF]

Zhong Nan Da Xue Xue Bao Yi Xue Ban
Cheng L, Zheng F, Zhong Z, Hui M, Qin N, Liu H, Yao Z.   +6 more
europepmc   +1 more source

[Family Environmental Unpredictability and Adolescent Physiological and Psychological Health: The Buffering Role of Positive School Climate]. [PDF]

Xin Li Xue Bao
倩 高, 静 陈, 宁 孙, 佳 李, 薇 王, 媛 向, 珺 谢, 华 林, Qianqian G, Meijing C, Jianing S, Yijia LI, Wei W, Shiyuan X, Mingjun X, Danhua L.   +15 more
europepmc   +1 more source

[How I treat anaphylaxis in children]. [PDF]

Zhongguo Dang Dai Er Ke Za Zhi
Xie M, Wang X.
europepmc   +1 more source

[Development of a machine learning-based model for assessing pulmonary function in elderly patients]. [PDF]

Nan Fang Yi Ke Da Xue Xue Bao
Chen C, Zhang W, Cai Y, Ouyang M, Liang Y, Liang M, Liang H.   +6 more
europepmc   +1 more source

[Research advances in the preparation and structural characterization of depolymerized oligosaccharides from traditional Chinese medicine]. [PDF]

Se Pu
Liu JY, Zheng Y, Yan JY.
europepmc   +1 more source