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Search Results: 1 - 10 of 36757 matches for " 雷昌蛟 "
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试析《经典释文》为常用异读字注常见音的原因
,杨军
安徽大学学报(哲学社会科学版) , 2014,
Abstract: 根据注音目的和注音原则,经典常用而有异读的字据义当读常见音时,《经典释文》一般是不注音的,因为常用异读字据义所读的常见音通行易识。但实际情况是,部分常用异读字据义当读常见音时,《释文》也出现了少量注音的情况,注音形式或“如字”,或反切,或直音。为常用异读字注常见音主要有肯定所见版本用字的正确,通过注常见音的办法来减少直接注异读音的数量,提示读者就按与常见音相关联的常见义去理解等原因。
基于遗传算法的HEV控制策略优化
Optimizing HEV Control Strategy Based on Genetic Algorithm

李军,徐杨,朱亚洲,
- , 2015,
Abstract: 混合动力汽车控制策略参数的选取对系统性能有重大的影响。为此,建立了以动力性能为约束指标、以燃油消耗率和排放为评价指标的混合动力汽车控制策略参数优化模型,并对控制策略参数进行优化。利用加权系数法整合评价指标,结合遗传算法工具箱GATBX对控制策略参数进行多目标优化,并利用ADVISOR对优化前后的性能进行仿真。仿真结果表明:在保证动力性的前提下有效降低了混合动力汽车燃料消耗量和排放,其中油耗和NOx降低了17%,HC和CO降低了大约7%。
The selection of parameters for a hybrid electric vehicle (HEV) control strategy has a significant influence on its performance. An optimization model for the HEV control strategy is set up to optimize the parameters of the HEV control strategy, including a constraint indicator of power performance and an evaluation indicator of fuel consumption and emissions. Since the parameter optimization for the HEV control strategy is a multi-objective optimization problem, evaluation indicators are integrated into one objective function by weighting their coefficients. GATBX (Genetic Algorithms Tool Box) was used to optimize the parameters for the HEV control strategy, and the performance of the optimized HEV was simulated by ADVISOR. The simulation results and their analysis show that the optimized control strategy can effectively reduce fuel consumption and emissions without sacrificing power performance and fuel consumption and that NOx emission is reduced by 17% and that HC and CO emissions are reduced by about 7%
中间锦鸡儿黄酮类成分的研究
,陈博,孙智华,
药学学报 , 2003,
Abstract: 目的研究中间锦鸡儿的化学成分。方法用溶剂法、色谱法分离化学成分,用波谱法鉴定其结构。结果从中间锦鸡儿中分离得到10个黄酮类化合物,分别鉴定为5,7,4′-三羟基-3,3′-二甲氧基黄酮(1),3,5,7,8,4′-五羟基-3′-甲氧基黄酮(2),槲皮素(3),柠檬黄酮醇(4),槲皮素-3-甲醚(5),2(s)-7,3′,5′-三羟基二氢黄酮(6),5,7,3′,4′-四羟基-3,8-二甲氧基黄酮(7),紫铆查尔酮(8),甘草素(9)和5,7,4′-三羟基-3,8二甲氧基黄酮(10)。结论化合物6为新化合物,其余皆首次从中间锦鸡儿中分离得到。
基于对焦深度法的自动调焦方案设计与实验验证
The Scheme Design and Test Verification of Automatic Focusing Based on Depth from Focus Method
 [PDF]

, 汪向阳, 陈佐龙, 周磊, 孙明,
Journal of Sensor Technology and Application (JSTA) , 2015, DOI: 10.12677/JSTA.2015.33008
Abstract: 相比于传统自动调焦方法,基于图像处理的光电自动调焦技术具有智能化、速度快、准确性高、便于控制等优势,已成为自动调焦技术研究的主流方向。本文首先通过构建模型,详细阐述了基于图像处理的光电自动调焦原理和流程,并简要介绍了两种常用自动调焦方法;接着,基于对焦深度法给出了本文设计的自动调焦方案;最后,利用搭建的原理性样机开展了自动调焦实验,验证了本文方案的可行性。
Compared with the traditional automatic focusing method, the photoelectric automatic focusing technology has become the main research direction due to its advantages, such as high intelligence, speediness, accuracy and convenient control. In this paper, the principle photoelectric automatic focusing based on imaging processing is stated in detail, and two common automatic focusing methods are introduced in brief. Then, this automatic focusing scheme is designed and put forward. At last, the automatic focusing test is carried out, and its feasibility is verified.
c(2×2)-(K+CO)在Co{1010}表面吸附的NEXAFS研究
,唐景
物理学报 , 1999,
Abstract: 对CO和K共吸附在CO{1010}表面的系统进行了O的1s NEXAFS理论研究,证实吸附分子CO的键长比气体状态时增长约0.01nm.用MSC(多重散射团簇)理论计算谱与实验结果比较发现:在原π峰右侧出现了一个新的弱结构.证明了此结构是由于K通过钴衬底对CO的间接作用造成的,它具有π共振的性质.
具有反馈的批到达离开门限与减1服务轮询系统
玉洁,鲁韦
重庆大学学报 , 2002, DOI: 10.11835/j.issn.1000-582X.2002.03.013
Abstract: 考虑了具有贝努利反馈的批到达服务轮询系统:对于离开门眼服务规则下的轮询系统,得到了Fi1(Z1,Z2,…,ZN)与Fi(Z1,Z2,…,ZN)的关系,各站轮询时刻的平均队长;服务器的轮询周期、服务器每次在各站的停留时间、访问间隔时间。对于减1服务规则下轮询系统而言,推导了Fi1(Z1,Z2,…,ZN)与Fi(Z1,Z2,…,ZN)与的关系以及服务器每次在各站的停留时间。
植物细胞固相培养研究进展
,
中国生物工程杂志 , 1990,
Abstract: 模拟植物体内的代谢环境及微生物的发酵培养而建立的植物细胞固相培养技术在有用的次生产物,如:药品、香料、甜味剂和食品色素等的商业化生产中有着重大意义。由于固相培养技术有以下优点,因而在本世纪八十年代已得到了迅速发展。(1)固相细胞间紧密接触及细胞的拟组织化可形成同一结构组织,从而促进合成途径的表达。
多孔介质毛细压力-饱和度的滞后特性
胡雪,杜建华,周磊,树业,刘翔
自然科学进展 , 2001,
Abstract: 通过对5种不同窄筛分沙样进行吸湿-排湿实验,获得了两种不同湿迁移途径下的毛细压力-饱和度关系曲线.结果表明,吸湿-排湿过程有明显的毛细滞后存在,而且沙样的粒径愈小,滞后效应的影响愈显著.传统的实验数据处理方法使用Leverett-UdeⅡ方程进行数据关联,由于J函数忽略了毛细滞后的影响,方法并不十分有效.使用突破压力和恢复压力作为能够表征滞后特性的特征压力,并对吸湿及排湿过程分别按实验数据拟合形状函数,结果表明,能更好地关联实验数据及拟合吸湿-排湿曲线.
基于数值模拟的雅砻江流域风能资源初步评估
Numerical simulations of the wind energy resources in the Yalong River area

杨明祥,王浩,蒋云钟,晓辉,宋健
- , 2018, DOI: 10.16511/j.cnki.qhdxxb.2018.22.013
Abstract: 针对传统评估手段在大范围风能资源评估中的不足,基于数值天气模式,从2000至2016年再分析资料中获得了雅砻江流域近17年的高分辨率风速模拟资料,并对雅砻江全流域风能资源进行了初步评估。评估内容主要包括平均风速空间分布、风功率密度空间分布、风速年内分布以及年风能可利用小时空间分布等。初步掌握了雅砻江流域风能资源的时空特征,分析结果表明:流域内存在一定比例的风能资源富集区,如宁蒗河与敢鱼河之间、甘孜所在经度线两侧、安宁河谷等成片区域。该研究为进一步的风能资源详查与实地观测提供了依据。
Abstract:Large scale wind energy resources are difficult to accurately assess. This study uses a numerical weather prediction model and wind data from 2000 to 2016 to calculate the wind speeds in the Yalong River area for about 17 years. The wind energy resources in the Yalong River area are assessed in terms of the spatial distribution of the average wind speed, the spatial distribution of the wind energy density, the annual distribution of the wind speed, and the temporal and spatial distribution of the annual exploitable wind energy. The analyses give the temporal and spatial features of the wind energy resources in the Yalong River area. There are several wind resource rich regions in the Yalong River area, such as the region near the longitude line of Ganzi, the region between the Ninglang River and the Ganyu River, and the Anning River valley. These results can be used for site selection for wind energy resources.
用显微镜观察并用胶厚样品相结构形态的新方法
吴祥龙,李浩,王梦,谢其,许春华,林裔珍
化工学报 , 1984,
Abstract: 该文探索了用高锰酸钾水溶液对某些含有不饱和键的通用烃类橡胶的并用胶厚样品表面进行单面染色的方法,用显微镜观察并用胶相结构形态.实验表明,对相容性很小的、具有明显分离相的并用胶如丁腈胶和三元乙丙胶的并用,该法尤为灵敏;对相容性很大的、无明显分离相的并用胶如天然胶和顺丁胶的并用,当胶料分散不均匀时,该法仍很灵敏;对某些不饱和胶与饱和塑料并用的两相结构如顺丁胶与低密度聚乙烯并用,三相结构如乙烯-醋酸乙烯共聚物、丁苯胶、聚乙烯并用,该法也很灵敏.该法仪器简单、操作方便、染色药品无毒、反差强、形态无畸变、应用广,为工业上快速检查并用工艺及并用物分散的均匀程度提供一个简单有效的手段.
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