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Search Results: 1 - 10 of 257872 matches for " 李进 "
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关于分担一个值的亚纯函数的唯一性的一个注记
A Note on Uniqueness of Meromorphic Functions Sharing One Value
 [PDF]


Pure Mathematics (PM) , 2012, DOI: 10.12677/PM.2012.24040
Abstract: 本文研究了分担一个值的亚纯函数的唯一性,得到两个结果,这改进了张同对、吕魏然的一个结果。
 In this paper, we study the uniqueness of meromorphic functions sharing one value, prove two main theorems which generalize and improve some results earlier given by M. L. Fang and W. Hong, T. D. Zhang and W. R. Lv in [6]
差不嘎蒿的分布及其在天然植被演替中的地位

中国沙漠 , 1991,
Abstract: 在中国差不嘎蒿主要分布在北纬42~50°,东径116~124°之间的温带半湿润、半干旱区的沙地上。差不嘎蒿群落类型较多,植物种丰富,结构较复杂,在半流动、半固定沙地植物群落中占绝对优势,起建群种作用。差不嘎蒿生态幅广,从流动沙丘背风坡到固定沙丘均有分布,但其最适宜的生境是水分条件较好、有些风蚀与沙埋的半流动、半固定沙地。随沙丘固定程度的提高,差不嘎蒿将退出群落,让给级冷蒿、糙隐子草等植物。
差巴嘎蒿繁殖若干问题的探讨

中国沙漠 , 1994,
Abstract: 差巴嘎蒿(Artemasiahalodendron)营养繁殖的最佳材料是当年生带根基部营养枝;降水量是影响营养繁殖成活率的主导因子,栽植后5日内降水之和(x)与成活率(y)的相关系数为0.9701,回归方程为:y=34.0236+41.04671gx。营养繁殖应在有一定降水的条件下及时进行,最佳时间在6月中旬。不宜利用种子繁殖建立人工植被。
基于可信性的低碳物流网络设计多目标模糊规划问题

系统工程理论与实践 , 2015,
Abstract: ?通过物流网络的优化设计来控制碳排放是提高低碳物流绩效的一种重要途径.针对模糊环境下多级低碳物流网络设计的战略定位和配置问题,综合考虑多级物流网络参数的模糊性以及战术层的多商品流、多生产技术和多运输方式的选择决策,以最小化物流网络的总成本和总碳排放为目标,集成采用期望值规划方法和机会约束规划方法,建立了基于可信性的多目标模糊数学规划模型.该模型引入二氧化碳当量作为衡量物流网络对环境影响的评估指标.然后,设计了一种基于可信性测度的交互式模糊求解方法对多目标模糊规划模型予以求解.最后,通过算例验证了模型和算法的有效性和可行性.
铁路工程测绘工作的发展

铁道工程学报 , 1993,
Abstract:
人工樟子松-差不嗄蒿植被及其固沙作用

生态学杂志 , 1992,
Abstract: ?
低碳环境下闭环供应链网络设计多目标鲁棒模糊优化问题

- , 2018, DOI: 10.13195/j.kzyjc.2016.1536
Abstract: 针对低碳环境下多级闭环供应链网络设计的战略定位和配置问题,综合考虑网络参数的模糊性以及多产品流,以供应链网络的总成本和总碳排放最小为目标,建立多目标鲁棒模糊优化模型.该模型将机会约束的最低置信水平作为决策变量,实现目标函数期望值、最优鲁棒性和可行鲁棒性之间的有效平衡.最后,设计一种基于必要性测度的交互式$\varepsilon$约束模糊求解方法,并通过算例验证所提模型和算法的有效性和可行性.
金沙江下游梯级水库运行后水文情势变化分析—基于流量历时曲线的生态流量指标
Flow Regime Alteration in the Lower Jinsha River after the Operation of Cascade Reservoirs—By Eco-Flow Metrics Based on Flow Duration Curve
 [PDF]

,, 尹正杰
Journal of Water Resources Research (JWRR) , 2014, DOI: 10.12677/JWRR.2014.35046
Abstract:
为评价金沙江梯级水库联合调度对下游的影响,以屏山水文站1951~2011年的实测逐日流量序列为基础,通过梯级水库联合调度运行模拟得到模拟调度逐日流量数据,采用基于流量历时曲线的生态流量指标法(eco-flow metrics)对比调度前后水文情势变化特征,分析金沙江梯级水库联合调度在长系列、丰平枯典型年以及自然四季中对生态水文过程的影响。同时对比通过变动范围法(Range of Variability Approach, RVA)分析水文情势得到的结果,讨论生态流量指标法的适用性。结果表明,金沙江梯级水库运行会对水库下游水文情势的产生较为显著的影响,主要体现在低流量以及枯水期的变化之上;生态流量指标和RVA在水文情势分析结果上具有一定的相似性,两者结合一起可以更好地分析水文情势的变化。
To evaluate the flow regime change in the lower Jinsha River after the operation of cascade reser-voirs, the change characteristics of flow regime in different periods were evaluated based on ob-served daily flow series at Pingshan hydrological station from 1951 to 2011 and the scheduling simulation data from 2031 to 2091 by using the eco-flow metrics based on flow duration curve. Meanwhile, the applicability of eco-flow metrics to evaluate the flow regime was discussed and compared with the results of flow regime obtained by using Range of Variability Approach (RVA). The results show that the operation of cascade reservoirs will lead to a significant change in flow regime at Pingshan hydrological station, which is mainly reflected in low flow and changes in low flow period. The results of flow regime obtained by using eco-flow metrics and RVA have a certain degree of similarity. Therefore, combination of the two groups of metrics provides a sufficient measure of the changes in the flow regime.
高中生情绪智力与危险行为的相关研究
A Correlation Study on Emotional Intelligence and Risk Behaviors in Senior School Students
 [PDF]

林余, 淼云, ,
Advances in Psychology (AP) , 2014, DOI: 10.12677/AP.2014.41014
Abstract:   目的:探讨情绪智力与危险行为的关系,为高中生情绪智力的开发及危险行为的预防提供依据。方法:采用巴昂情商量表青少年版(EQ-i: YV)和青少年危险行为评定量表对559名高中生进行测试。结果:1) 男女的情绪智力无显著差异,男生的危险行为显著高于女生;学业成绩越好的学生情绪智力越高,危险行为越低。2) 情绪智力与危险行为呈负相关。3) 压力管理能力和一般心境联合解释了危险行为24.2%的变异量。结论:高中生情绪智力与危险行为之间存在显著的相关,可以通过提高学生的情绪智力来减少危险行为。 Purpose: To ascertain the relationship between their emotional intelligence (EQ) and risk behaviors (RB), and to provide the basis for developing their emotional intelligence and preventing their risk behaviors. Methods: 559 senior school students were evaluated with Emotional Quotient Inventory: Young Version (EQ-i: YV) and Teenagers’ Risk Behaviors Scale. Results: 1) Scores of RB among boys were higher than girls’, but no gender differences in EQ. Scores among good academic performance were higher than those among bad academic performance in EQ, but inversely in RB. 2) EQ had negatively correlated to RB. 3) Stress management and general mood in EQ accounted for 24.2% of the variance in RB. Conclusions:
从临床标本分离致病性L型细菌

微生物学通报 , 1988,
Abstract: 由于临床上对抗生素的长期使用,导致细菌发生变异而形成细胞壁缺陷型即细菌L型,此时临床所表现的症状和治疗前基本相似。我们于1985年检查了20份临床标本,分离出细菌L型14株,现将分离情况报道如下:
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