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民办高校思政课专题化差异性进阶式教学对学生思想政治素质的影响研究
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作者 陆启义 《中国军转民》 2024年第10期206-207,共2页
探讨民办高校思想政治课程在专题化差异性进阶式教学方面的实施情况及其对学生思想政治素质的影响。通过深入分析教学方法的差异性,研究发现这种教学模式在提升学生思想政治素质方面具有积极作用,有望为提高民办高校思政课程的教学质量... 探讨民办高校思想政治课程在专题化差异性进阶式教学方面的实施情况及其对学生思想政治素质的影响。通过深入分析教学方法的差异性,研究发现这种教学模式在提升学生思想政治素质方面具有积极作用,有望为提高民办高校思政课程的教学质量提供有益启示。 展开更多
关键词 民办高校 专题化教学 异性阶式教学 思想政治素质
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泵站进水流道差压与流量关系曲线回归方法研究
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作者 刘德祥 刘梅清 《中国农村水利水电》 2000年第11期37-38,共2页
大型泵站在采用进水流道差压法测流时 ,必须作回归计算 ,回归计算法直接影响到差压法测流的精度。提出一种相对误差最小的回归方法。理论分析与实例计算表明 ,本方法可改善回归效果 。
关键词 压法 回归计算 流量 泵站 水流道
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基于层次分析法的进线段差异性综合防雷改造措施
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作者 杨坡 窦卫东 +2 位作者 王勇 周勇 周利兵 《电气技术》 2014年第5期81-85,共5页
针对进线段采取差异性综合防雷改造措施:前四级杆塔安装差异性保护间隙、终端塔安装线路避雷器、降低前四级杆塔冲击接地阻抗,解决线路侧与变电站绝缘水平配合存在的问题,降低雷电侵入波峰值、陡度。根据层次分析法的基本原理及矿区电... 针对进线段采取差异性综合防雷改造措施:前四级杆塔安装差异性保护间隙、终端塔安装线路避雷器、降低前四级杆塔冲击接地阻抗,解决线路侧与变电站绝缘水平配合存在的问题,降低雷电侵入波峰值、陡度。根据层次分析法的基本原理及矿区电网供电特点,建立层级架构评估模型,通过求解相应判断矩阵、权重向量,对进线段综合防雷改造措施进行综合评估,最后得出进线段差异性综合防雷改造优先顺序:前四级杆塔安装差异性保护间隙、终端塔安装线路避雷器、降低前四级杆塔冲击接地阻抗,并通过ATP-EMTP对上述进线段改造措施的防雷效果进行仿真对比分析。 展开更多
关键词 层次分析法 线段异性综合防雷 ATP-EMTP 综合评估 保护间隙
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如何减少GPS测量垂线偏差对进洞观测方向的影响
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作者 侯文广 王庆玉 蔡一廷 《山西水利科技》 1999年第2期88-90,共3页
本文用理论及数据说明近洞的GPS点与进洞点,近距而高差大时,进洞点投点的垂线偏差,将影响隧洞横向正确贯通。
关键词 GPS 垂线偏 洞点高程 隧洞
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浅谈天然气进销差控制与管理 被引量:1
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作者 张恒 田云祥 《城市燃气》 2014年第7期30-35,共6页
进销差作为城市燃气企业控制输气成本的关键指标,本文从进销差产生的原因分析入手,针对居民用户、工商业用户,从天然气输入为起点,较为全面的阐述燃气企业在生产经营中有效控制进销差的一系列措施,从而加强进销差控制与管理。
关键词 计量管理 管存气
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进排气压力对气门式二冲程柴油机扫气过程的影响
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作者 付雪青 张岩 +4 位作者 丁占铭 庄安帮 朱伟 程江华 张树勇 《汽车安全与节能学报》 CAS CSCD 北大核心 2023年第1期125-132,共8页
为深入理解气门式二冲程发动机的扫气过程,以顶端入口进气道气门式二冲程柴油机为研究对象,在1 500 r/min转速下采用三维仿真研究了扫气过程中进排气压差和排气背压对缸内气体流动的影响机理。结果表明:由左侧进气道流入气缸的新鲜充量... 为深入理解气门式二冲程发动机的扫气过程,以顶端入口进气道气门式二冲程柴油机为研究对象,在1 500 r/min转速下采用三维仿真研究了扫气过程中进排气压差和排气背压对缸内气体流动的影响机理。结果表明:由左侧进气道流入气缸的新鲜充量形成逆滚流,其前锋面抵达排气门之前经右侧进气道流入气缸的新鲜充量主要影响排气纯度,而在之后排气纯度明显增加;压差从30 kPa增加至210 kPa时左侧排气道排气纯度增加,在中低压差下右侧排气道排气纯度较高,扫气品质系数先从0.61降低至0.52,之后增加至0.56且保持不变;定压差和背压从100 kPa增加至190 kPa时排气纯度接近,而扫气效率增加较慢,扫气品质系数从0.55降低至0.53。 展开更多
关键词 气门式二冲程柴油机 逆滚流 排气压 排气背压 扫气过程
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叠片式过滤器进出水管差压高原因分析及对策 被引量:1
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作者 魏冬 《科技创新导报》 2020年第17期55-56,共2页
采用美国沃特邦(BOWNT)公司生产的BOD SH 405/8FC型叠片式过滤器对进入超滤的生产水进行前置过滤,叠片式过滤器在运行3个月左右后压差普遍升高,导致超滤出水浊度偏高,经分析是由于沙子、铁锈垢堵塞叠片间的过滤沟槽和过滤器反洗参数设... 采用美国沃特邦(BOWNT)公司生产的BOD SH 405/8FC型叠片式过滤器对进入超滤的生产水进行前置过滤,叠片式过滤器在运行3个月左右后压差普遍升高,导致超滤出水浊度偏高,经分析是由于沙子、铁锈垢堵塞叠片间的过滤沟槽和过滤器反洗参数设置不合理造成的。先通过水冲洗再通过酸洗去除叠片式内铁锈和缩短反洗时间间隔等措施,叠片式过滤器进出水管压差明显降低,出水浊度降低,过滤效果得到明显提升。 展开更多
关键词 叠片式过滤器 出水管 浊度
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用进消差法控制库存储备初探
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作者 杨和民 《同煤科技》 1989年第1期44-46,共3页
关键词 库存 储备 仓库管理
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非互易闭锁移相器差相移步进量的问题
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作者 李黎 《电讯工程》 2001年第1期11-13,共3页
本文主要阐述了铁氧体移相器相移步进量对天线性能的影响。以及为了解决该问题的一些设计考虑,并给出子典型的一组C波段非互易闭锁式铁氧体移相器的差相步进量测试数据,取得了较为满意的效果。
关键词 非互易闭锁移相器 相移步 相控阵 铁氧体移相器
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用火焰矫正修复机械零件加工误差 被引量:4
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作者 冉传海 谢旦甲 《四川工程职业技术学院学报》 2007年第3期60-61,共2页
针对传统的修复方法,本文用实例介绍了火焰矫正在修复机械零件加工中尺寸缺陷的技术问题。
关键词 加热 收缩 膨胀 进差
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国家医药管理局等单位决定加强对进口医药商品的价格管理
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作者 唐德江 《中国药房》 CAS CSCD 1990年第4期44-,共1页
最近,国家医药管理局、国家物价局发出通知,决定加强对医药商品价格的管理和整顿,通知规定: 一、加强进口医药商品(指药品和医疗器械,下同)计划管理。
关键词 医药商品 购销
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Z地区天然气管网平衡差影响因素分析与天然气需求短期预测 被引量:2
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作者 李光越 王泽鑫 +3 位作者 于文广 李国军 石咏衡 张博越 《油气田地面工程》 2021年第6期62-70,共9页
为掌握管网进销平衡差波动规律,提前做好管网管存合理分配,基于Z地区天然气管网进销特征,结合近3年管网进销平衡差动态资料,从季节性、日期类型、天气温度等因素入手,分析了Z地区管网进销平衡差的影响因素,并采用方差分析方法对各影响... 为掌握管网进销平衡差波动规律,提前做好管网管存合理分配,基于Z地区天然气管网进销特征,结合近3年管网进销平衡差动态资料,从季节性、日期类型、天气温度等因素入手,分析了Z地区管网进销平衡差的影响因素,并采用方差分析方法对各影响因素进行综合评价,量化分析各因素对管网平衡差的影响程度,结果发现,冬季(供暖季)、节假日对于管网进销平衡差有显著的影响。根据方差分析结果,建立了关于管网销气量的神经网络短期预测模型。用BP、Elman、RBF神经网络模型预测日常管网销气,得到2020年3月整体销气预测值的平均相对误差分别为1.95%、1.51%、1.45%,均方根误差分别为781.34×104、703.65×104、655.31×104 m3。相比其他两种模型,RBF神经网络预测值更加贴近实际销气量,具有良好的预测结果。RBF神经网络模型预测重大节日管网销气,所得误差值稍大于日常情况下的预测值,但误差仍在合理的范围之内,证明该模型能够准确地预测重大节日下管网销气量,为Z地区管网调度运行、工况调整提供数据支持。 展开更多
关键词 天然气管网 销平衡 预测模型 神经网络 分析
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Full-Wave Analysis of Slotline Using Time-Domain Finite-Difference Method
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作者 李媛 罗贺琴 言华 《Transactions of Tianjin University》 EI CAS 2002年第1期43-47,共5页
The transmission and dispersive characteristics of slotline are calculated in this paper. The tail of Gaussion pulse is improved because a modified dispersive boundary condition (DBC) is adopted. It leads to a reduct... The transmission and dispersive characteristics of slotline are calculated in this paper. The tail of Gaussion pulse is improved because a modified dispersive boundary condition (DBC) is adopted. It leads to a reduction in computer memory requirements and computational time. The computational domain is greatly reduced to enable performance in personal computer. At the same time because edges of a boundary and summits are treated well, the computational results is more accurate and more collector. 展开更多
关键词 time domain finite difference SLOTLINE modified dispersive boundary condition
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Expression and Phylogenetic Analysis of Pea Actin Isoforms 被引量:5
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作者 江元清 赵武玲 《Acta Botanica Sinica》 CSCD 2002年第12期1456-1461,共6页
Pea ( Pisum sativum Linn.) actin gene family contains at least three isoforms (PEAcⅠ, PEAcⅡand PEAcⅢ), and the DNA sequence of these isoforms show high similarity in the coding regions and significant divergence... Pea ( Pisum sativum Linn.) actin gene family contains at least three isoforms (PEAcⅠ, PEAcⅡand PEAcⅢ), and the DNA sequence of these isoforms show high similarity in the coding regions and significant divergence in the untranslated regions. RT_PCR and Southern blotting using 3′_untranslated region (3′_UTR) as specific probe revealed that pea isoactin genes were expressed in roots, stems, leaves, tendrils, pollen and juvenile siliques, but displayed different patterns of transcript accumulation. Two_fold serial dilution electrophoresis showed PEAcⅠ mRNA preferentially accumulated in rapidly developing tissues: it peaked in seven days' stem; remained at a rather high level in leaves within a month but decreased significantly later; varied a little in tendrils and reached a median and a very low level respectively in juvenile siliques and in pollen. PEAcⅡ displayed somewhat similar expression pattern to PEAcⅠ. The observed differences in sequences and transcript accumulation patterns suggest that the individual pea actin genes may differ in their transcriptional regulation and cellular function. Phylogenetic tree of actins showed that pea actin isoforms are as diverged from each other as they are from other plant actins, and pea actins might have originated from a common ancestor before the divergence of the dicot and monocot plants. 展开更多
关键词 ACTIN 3′_untranslated region (3′_UTR) differential expression molecular evolution pea ( Pisum sativum )
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Molecular Characterization of Four ADF Genes Differentially Expressed in Cotton 被引量:4
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作者 张成伟 郭林林 +4 位作者 王秀兰 张辉 石海燕 许文亮 李学宝 《Journal of Genetics and Genomics》 SCIE CAS CSCD 北大核心 2007年第4期347-354,共8页
Actin depolymerizing factor (ADF), highly conserved in all eukaryotic cells, is a low molecular mass of actin-binding protein, which plays a key role in modulating the polymerizing and depolymerizing of the actin fi... Actin depolymerizing factor (ADF), highly conserved in all eukaryotic cells, is a low molecular mass of actin-binding protein, which plays a key role in modulating the polymerizing and depolymerizing of the actin filaments. Four cDNAs (designated GhADF2, GhADF3, GhADF4, and GhADF5, respectively) encoding ADF proteins were isolated from cotton (Gossypium hirsutum) fiber cDNA library. GhADF2 cDNA is 705 bp in length and deduces a protein with 139 amino acids. GhADF3 cDNA is 819 bp in length and encodes a protein of 139 amino acids. GhADF4 cDNA is 804 bp in length and deduces a protein with 143 amino acids. GhADF5 cDNA is 644 bp in length and encodes a protein of 141 amino acids. The molecular evolutionary relationship of these genes was analyzed by means of bioinformatics. GhADF2 is closely related to GhADF3 (99% identity) and PetADF2 (89% identity). GhADF4 is closely related to AtADF6 (78% identity), and GhADF5 is closely related to AtADF5 (83% identity). These results demonstrated that the plant ADF genes are highly conserved in structure. RT-PCR analysis showed that GhADF2 is predominantly expressed in fiber, whereas, GhADF5 is mainly expressed in cotyledons. On the other hand, it seems that GhADF3 and GhADF4 have no tissue specificity. Expression levels of different ADF genes may vary considerably in the same cell type, suggesting that they might be involved in regulating tissue development of cotton and the each ADF isoform may diverge to form the functional difference from the other ADFs during evolution. 展开更多
关键词 cotton ADF gene actin-depolymerizing factor sequence analysis molecular evolution gene different expression
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Progress in mRNA Differential Display
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作者 夏涛 蒋永华 +1 位作者 周涵韬 李碧荣 《Developmental and Reproductive Biology》 1996年第1期60-72,共13页
The mRNA Differential Display is a new molecular biological strategy for detecting and characterizing altered gene expression in eukaryotic cells which wad developed in 1992.Because of its simplicity,sensitivity and r... The mRNA Differential Display is a new molecular biological strategy for detecting and characterizing altered gene expression in eukaryotic cells which wad developed in 1992.Because of its simplicity,sensitivity and reproducibility,this method should find wide-ranging underpaid application developmental and molecular biology.Therecent successful applications of this method to gene hunting and the technological improvement promise great potential of mRNA Differential Display. 展开更多
关键词 mRNA Differential Display
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An Improved Differential Evolution for Optimization of Chemical Process 被引量:11
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作者 吴燕玲 卢建刚 孙优贤 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2008年第2期228-234,共7页
Differential evolution (DE) is an evolutionary optimization method, which has been successfully used in many practical cases. However, DE involves large computation time, especially, when used to optimize the compur... Differential evolution (DE) is an evolutionary optimization method, which has been successfully used in many practical cases. However, DE involves large computation time, especially, when used to optimize the compurationally expensive objective function. To overcome this .difficulty, the concept of immunity based on vaccination is used to help proliferate excellent schemata and to restrain the degenerate phenomenon. To improve the effective- ness of vaccines, a new vaccine autonomous obtaining method, and a method of deciding the probability of vacci- nation are proposed. In addition, a method for modifying the search space dynamically is proposed to enhance the possibility of converging to the true global optimum. Experiments showed that the improved DE performs better than the classical DE significantly. 展开更多
关键词 differential evolution VACCINE CONVERGENCE search space OPTIMIZATION
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努力开创中药工作新局面
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作者 马丁 《中草药》 CAS 1983年第4期1-3,共3页
中医药学是我国宝贵的文化遗产,有几千年的历史,对中华民族的生存繁衍、兴旺发达起了重要作用。毛泽东、周恩来等同志生前曾指出:'中国医药学是一个伟大的宝库,应当努力发掘,加以提高。''发扬祖国医药遗产,为社会主义建设... 中医药学是我国宝贵的文化遗产,有几千年的历史,对中华民族的生存繁衍、兴旺发达起了重要作用。毛泽东、周恩来等同志生前曾指出:'中国医药学是一个伟大的宝库,应当努力发掘,加以提高。''发扬祖国医药遗产,为社会主义建设服务。'我们应当大力发掘、整理、继承和提高,在今后社会主义现代化建设中,为保障人民身体健康,保护社会生产力,作出更大贡献。 展开更多
关键词 生产者 自治区 地区 集体福利基金 供销社 中药行业
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Differential evolution with controlled search direction 被引量:3
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作者 贾丽媛 何建新 +1 位作者 张弛 龚文引 《Journal of Central South University》 SCIE EI CAS 2012年第12期3516-3523,共8页
A novel and simple technique to control the search direction of the differential mutation was proposed.In order to verify the performance of this method,ten widely used benchmark functions were chosen and the results ... A novel and simple technique to control the search direction of the differential mutation was proposed.In order to verify the performance of this method,ten widely used benchmark functions were chosen and the results were compared with the original differential evolution(DE)algorithm.Experimental results indicate that the search direction controlled DE algorithm obtains better results than the original DE algorithm in term of the solution quality and convergence rate. 展开更多
关键词 differential evolution evolutionary algorithm search direction numerical optimization
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An Immune Self-adaptive Differential Evolution Algorithm with Application to Estimate Kinetic Parameters for Homogeneous Mercury Oxidation 被引量:12
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作者 胡春平 颜学峰 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2009年第2期232-240,共9页
A new version of differential evolution (DE) algorithm, in which immune concepts and methods are applied to determine the parameter setting, named immune self-adaptive differential evolution (ISDE), is proposed to... A new version of differential evolution (DE) algorithm, in which immune concepts and methods are applied to determine the parameter setting, named immune self-adaptive differential evolution (ISDE), is proposed to improve the performance of the DE algorithm. During the actual operation, ISDE seeks the optimal parameters arising from the evolutionary process, which enable ISDE to alter the algorithm for different optimization problems and improve the performance of ISDE by the control parameters' self-adaptation. The .performance of the proposed method is studied with the use of nine benchmark problems and compared with original DE algorithm ~nd-other well-known self-adaptive DE algorithms. The experiments conducted show that the ISDE clearly outperforms the other DE algorithms in all benchmark functions. Furthermore, ISDE is applied to develop the kinetic model for homogeneous mercury. (Hg) oxidation in flue gas, and satisfactory results are obtained. 展开更多
关键词 differential evolution immune system evolutionary computation parameter estimation
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