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Search Results: 1 - 10 of 74041 matches for " 尹正杰 "
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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]

, 陈进,
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.
金沙江下游梯级水库防洪库容调整对川江防洪的影响分析
Effect of Cascade Reservoirs Operation for Flood Control on the Chuan River
 [PDF]

杨春花, 许继军,
Journal of Water Resources Research (JWRR) , 2012, DOI: 10.12677/JWRR.2012.15056
Abstract: 为弄清金沙江下游梯级水库防洪库容预留大小对川江河段防洪的作用,设定原设计防洪库容、防洪库容削减一半、不预留防洪库容三种防洪库容预留方案。根据金沙江下游四座梯级水库的汛期运行方式,对各防洪库容预留方案不同典型不同频率下的设计洪水进行调洪演算,防洪调度结果显示,当岷江和其它区间支流汇入洪量较大时,梯级水库对川江防洪的补偿作用不明显;当金沙江处洪量较大时,各防洪库容预留方案对川江河段防洪效果差异较大,相对其他两种方案,原设计防洪库容的方案对川江河段防洪效果较好;削减一半防洪库容的方案在遇较大洪水时对川江防洪有一定的影响;而不预留防洪库容的方案基本不能保证川江河段防洪安全。
In order to analyze the effect of cascade reservoir storages on flood control of the Chuan River, three flood control storage schemes, which are design flood control storage half of design flood control stor-age and none storage, are assumed. For the design flood with different frequencies, a flood control cascade operation model has been adopted to simulate the regulation of flood control operation. The results show that if inflow from the Min River and other tributaries are larger, the flood control effect of the lower Jinsha River cascade reservoirs on the Chuan River wouldn’t be significant. If inflow from the Jinsha River is larger, the effect of flood control on the Chuan River with each scheme will be different. The scheme of design flood control storage has the best flood control effect; while the scheme with none storage can’t guarantee flood control safety of the Chuan River.
Classification performance exploration of artificial immune recognition system for exacting operating rules of water supply reservoir
人工免疫识别系统提取水库供水调度规则的性能分析

王小林,成金华,,胡铁松
系统工程理论与实践 , 2009,
Abstract: 以北方某供水水库为例, 将人工免疫识别系统(Artificial immunerecognition system,AIRS)作为一种新兴数据挖掘方法用于水库调度规则提取研究,所获调度规则对检验样本的分类精度为86.1%,缺水指数为2.14(1014m6, 优于RBF提取调度规则的结果.进一步从调度规则与训练、检验样本之间的距离分布间接分析了在水库调度特征属性构成的高维非线性决策空间中亲和力测度方法、学习样本空间分布以及追加样本对AIRS提取供水调度规则的行为与性能的影响. 结果表明, ①HVDM(Heterogeneous value differencemetric)距离测度方法能融入调度决策先验知识,使AIRS提取的规则在空间分布上更接近训练、检验样本;②所获规则分类性能不仅取决于训练样本空间分布,也取决于检验样本的空间分布;③追加近期调度资料可以不断更新或补充规则,使其空间分布更适应未来水文环境变化.
新型拖拉机电液控制系统
,,朱忠祥,谢斌,毛恩荣,武兴
吉林大学学报(工学版) , 2008,
Abstract: 对具有锥阀式结构的电液控制系统在操作平顺性、液压冲击、发热、卸荷压力、响应特性等方面进行了详细的研究,提出利用动压反馈装置解决冲击问题。在本文所述条件下,农具提升时所引起的拖拉机俯仰角速度由原来拖拉机液压系统的0.3rad/s降到0.08rad/s,压力冲击峰值由4.0MPa降到2.8MPa,卸荷时控制阀块内部压力损失为0.12MPa,达到热平衡时的液压油温度为38℃,该电液控制系统的开关频率为5.5Hz。
一维空间中半线性波方程的渐近理论及应用

四川师范大学学报(自然科学版) , 1999,
Abstract: 研究一类具初值问题半线性波方程的渐近理论.在C2空间中得到了所给问题解的渐近合理性,并部分地回答C.J.Blom在1994年提出的问题更多还原
三维空间中一类波动方程的渐近理论

四川师范大学学报(自然科学版) , 1999,
Abstract: 研究三维空间中一类半线性波动方程解的渐近理论,在古典空间C2中得到了形式近似解的合理性在长时间t∈O(|ε|-1)内成立.和LaiSY及MuCL(Appl.MathJCV.,1997,12(3)321~322)中的同样结果比较,本文所用的限制条件更弱.更多还原
成人脊柱标本单侧椎板入路双侧减压前后腰椎管参数CT测量结果比较
刘鹏, 孙庆, 秦廷, 孙东,, 小荣, 崔林, 秦向征
吉林大学学报(医学版) , 2015, DOI: 10.13481/j.1671-587x.20150526
Abstract: 目的:采用解剖学方法探讨单侧入路双侧减压(ULBD)方法治疗退变性腰椎管狭窄症的可行性。方法:选取10具成人脊柱区标本,在尽可能地保护后方韧带复合体的前提下,对标本腰椎各节段进行ULBD手术,手术前后对腰椎各节段行CT扫描,测量上终板、间盘、下终板平面椎管面积、椎管前后径和左右横径。结果:手术后标本的上终板水平、间盘水平和下终板水平椎管纵径、横径及椎管面积均比手术前增大(P<0.01)。结论:在最大限度地保留后方韧带复合体的前提下,ULBD手术能够有效地进行腰椎管扩大,即完成神经减压。
情绪对前瞻记忆的影响及其神经基础
The Effects of Emotion on Prospective Memory and Its Neural Bases
 [PDF]

, 黄希庭
Advances in Psychology (AP) , 2016, DOI: 10.12677/AP.2016.64062
Abstract:
前瞻记忆是一种主动记起未来要执行某一种行为的能力,受到多种因素的影响。情绪是个体对客观事物是否满足自己的需要而产生的态度的主观体验,它对前瞻记忆具有一定影响。情绪对前瞻记忆影响的理论解释有Ellis和Ashbrook的资源分配理论和Eysenck和Calvo的加工效能理论。负性情绪和正性情绪对前瞻记忆的影响不同。未来应多关注积极情绪对前瞻记忆的影响及其神经生理机制。
The prospective memory is the ability of remembering to executive an act in the future on one’s own initiative and is affected by many factors. Emotion is the subjective experience of the individ-ual’s attitude to the objective things whether meet their needs. It has a certain effect on the pros-pective memory. Ellis and Ashbrook’s resource allocation model and Eysenck and Calvo’s processing efficiency theory serve as the theoretical explanations for emotion affecting prospective memory. Positive emotion and negative emotion have different effects on prospective memory. The future study should pay more attention to positive emotion and its neural bases of emotion influencing prospective memory.
三种益生菌对罗曼粉壳蛋鸡蛋品质的影响
Effect of three dietary supplementations of probiotic bacteria on egg quality of Lehmann Pink layers

龙爱琳,刘伦,刘嘉,,杨丽琴,,王彦,华东,朱庆,李天,赵小玲
- , 2016,
Abstract: 为探究三种草科鸡源益生菌(枯草芽孢杆菌、植物乳杆菌和戊糖片球菌)对鸡蛋蛋品质的影响.选用1日龄480羽罗曼粉壳蛋鸡,随机分为4组,每组3个重复,每个重复40只鸡,对照组(CP)饲喂基础饲粮,试验组在基础饲粮的基础上分别添加枯草芽孢杆菌(Bacillus subtilis,BS)、植物乳杆菌(Lactobacillus plantarum,LP)和戊糖片球菌(Pediococcu spentosaceus,PP),活菌数大于107 CFU/g.220d测定600枚鸡蛋的蛋品质:与对照组相比,饲料中添加植物乳杆菌(LP)和戊糖片球菌(PP)能分别使蛋黄颜色加深2.91%和1.68%(P<0.05).BS组与对照组相比,蛋黄重增加了4.09% (P<0.05);蛋壳厚度增加了9.64%(P<0.05);蛋重增加了3.22%(P<0.05).在改善蛋品质整体效果上,枯草芽孢杆菌优于植物乳杆菌,植物乳杆菌优于戊糖片球菌.本试验为微生态制剂在蛋鸡生产上的应用与推广提供了科学依据.
This experiment was conducted to investigate the impact of probiotics (Bacillus subtitles, Lactobacillus plantarum and Pediococcus pentosaceus) on egg quality of Caoke chicken. Four hundred and eighty new-born chicks of Lohmann Pink layers were randomly divided into 4 groups with 3 replicats. The control group was fed the basic diet (CP). And the experimental groups were added Bacillus subtitles (BS), Lactobacillus plantarum (LP), and Pediococcus pentosaceus (PP), respectively. The average amount of bacteria was no less than 107 CFU per day. The eggs quality (n = 600, at 220 d) differences among the experimental groups were shown as following: compared with the control group, the yolk color of group LP deepened by 2.91% (P<0.05), and group PP deepened by 1.68% (P<0.05), respectively. The average yolk weight of BS was heavier than the control group by 4.09% (P<0.05), and its average shell thickness was thicker than the control group by 9.64% (P<0.05), and the egg weight of BS was higher than the control group by 3.22 % (P<0.05). All analysis showed that egg quality traits were significantly affected by the three probiotics. Bacilli subtilize (BS) performed better than Lactobacillus plantarum (LP), and Lactobacillus plantarum (LP) performed better than Pediococcus pentosaceus (PP). This study provided the basic information for putting the three probiotic into egg production in chickens
图书营销渠道管理及其运行模式研究

科技与出版 , 2010,
Abstract: 图书营销渠道是实现出版企业价值、满足人们图书消费需求的必经通道。图书营销渠道管理的具体内涵包括图书营销战略管理、图书营销业务流程管理、图书营销渠道成员管理和图书营销渠道关系管理四个方面。图书营销渠道管理的运行模式就是围绕上述四个方面,根据出版企业内部运行机制和外部环境变化,以营销战略管理、渠道关系管理、渠道设计与渠道结构创新为重点,形成内部管理链、渠道成员管理链、渠道主客体管理链和渠道环境管理链。
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