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空气相对湿度对袋式除尘系统木粉尘过滤性能影响实验研究

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林业机械与木工设备 2025年第1期53卷 27-33页

作者：花军郑文晗黄孝华东北林业大学机电工程学院黑龙江哈尔滨150040 中山市天蓝除尘设备有限公司广东中山528400

针对木制品加工生产线采用的袋式除尘系统滤袋过滤性能易受空气相对湿度影响的问题,通过实验研究了空气相对湿度对木粉尘过滤阻力、过滤效率、清灰周期等参数的影响,确定对木粉尘除尘效果相对有利的空气相对湿度区间,以指导实际生产应... 详细信息

针对木制品加工生产线采用的袋式除尘系统滤袋过滤性能易受空气相对湿度影响的问题,通过实验研究了空气相对湿度对木粉尘过滤阻力、过滤效率、清灰周期等参数的影响,确定对木粉尘除尘效果相对有利的空气相对湿度区间,以指导实际生产应用中木粉尘除尘的空气相对湿度调控。实验研究结果表明:空气相对湿度越高,过滤阻力增长越慢,对过滤性能的影响作用越好;在一定工作范围内过滤效率基本不受空气相对湿度变化影响,均可达到99.99%;测试范围内,清灰周期在70%RH之前逐渐升高、超过70%RH之后逐渐降低,过滤性能品质因子在60%RH时增长至0.01612,超过60%RH后小幅度降低。空气相对湿度在60%~70%时,袋式除尘系统过滤木粉尘效果较好、清灰能耗较低。这一研究结果为木制品生产企业利用袋式除尘系统处理木粉尘提供了可参考的数据支持。

关键词：袋式除尘系统空气相对湿度木粉尘过滤性能实验

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银发数字鸿沟:影响因素、类型及跨越之策

成人教育 2025年第3期45卷 34-41页

作者：陈杰马丽华黄悦琦上海开放大学静安分校上海200040 华东师范大学上海200062 上海市静安区业余大学上海200040

助力老年人跨越数字鸿沟,事关民生。通过半结构访谈发现,银发数字鸿沟存在机能、安全、支持和意愿四个影响因素,其外在表现为不同程度的技能沟。通过问卷调查,采用聚类分析法,归纳出老年人智能手机运用基本类型和每一类型的主要特点,确... 详细信息

助力老年人跨越数字鸿沟,事关民生。通过半结构访谈发现,银发数字鸿沟存在机能、安全、支持和意愿四个影响因素,其外在表现为不同程度的技能沟。通过问卷调查,采用聚类分析法,归纳出老年人智能手机运用基本类型和每一类型的主要特点,确定游离型、激进型、谨慎型为银发数字鸿沟的三个基本类型,其分别揭示了银发数字鸿沟的程度之深、跨越之险及跨越之难。在此基础上,提出推进数字安全教育、老年学习团队活动、互联网无障碍改造及居委教育资源下沉等四项建议,以优化老年数字教育,促进老年人融入数字社会。

关键词：老年人数字鸿沟影响因素类型

Microstructure and Mechanical Properties of Mg–RE–TM Cast Alloys Containing Long Period Stacking Ordered Phases: A Review

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Acta Metallurgica Sinica(English Letters) 2019年第3期32卷 269-285页

作者： huan Liu He huang Jia-Peng Sun Ce Wang Jing Bai Ai-Bin Ma xian-hua Chen College of Mechanics and Materials Hohai University College of Materials Science and Engineering Southeast University National Engineering Research Center for Magnesium Alloys (CCMg) Chongqing University

Casting magnesium alloys hold the greatest share of magnesium application products due to their short processing period, low cost and near net shape forming. Compared with conventional commercial magnesium alloys or other Mg–RE-based alloys, the novel Mg–RE–TM cast alloys with long period stacking ordered(LPSO) phases usually possess a higher strength and are promising candidates for aluminum alloy applications. Up to now, two ways: alloying design and casting process control(including subsequent heat treatments), have been predominantly employed to further improve the mechanical properties of these alloys. Alloying with other elements or ceramic particles could alter the solidifi cation pattern of alloys, change the morphology of LPSO phases and refi ne the microstructures. Diff erent casting techniques(conventional casting, rapidly solidifi cation, directional solidifi cation, etc.) introduce various microstructure characteristics, such as dendritic structure, nanocrystalline, metastable phase, anisotropy. Further heat treatments could activate the transformation of various LPSO structures and precipitation of diverse precipitates. All these evolutions exert great impacts on the mechanical properties of the LPSO-containing alloys. However, the underlying mechanisms still remain a subject of debate. Therefore, this review mainly provides the state of the art of the casting magnesium alloys research and the accompanying challenges and summarizes some topics that merit future investigation for developing high-performance Mg–RE–TM cast alloys.

关键词： Magnesium alloys Long period stacking ordered phase Casting Heat treatment Phase transformations Mechanical properties

[Cs_(6)Cl][Ga_(5)GeQ_(12)](Q=S,Se):two novel porous layered chalcohalides exhibiting two-band emission and ion exchange properties

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Science China Chemistry 2022年第10期65卷 1903-1910页

作者： Ruiqi Wang xian Zhang Fuqiang huang Beijing National Laboratory for Molecular Sciences State Key Laboratory of Rare Earth Materials Chemistry and ApplicationsCollege of Chemistry and Molecular EngineeringPeking UniversityBeijing 100871China Qian Xuesen Laboratory of Space Technology China Academy of Space TechnologyBeijing 100094China State Key Laboratory of High-Performance Ceramics and Superfine Microstructure Shanghai Institute of CeramicsChinese Academy of SciencesShanghai 200050China

The salt-inclusion materials have drawn significant attention for their manifold structural chemistry and novel physical/chemical ***,two new salt-inclusion chalcohalides,[Cs_(6)Cl][Ga_(5)GeQ_(12)](Q=S,Se),have been discovered via hightemperature flux *** two isostructural compounds are constructed by porous[Ga_(5)GeQ_(12)]^(5−)layers with[ClCs_(6)]^(5+)octahedra filled in the ***[Ga_(5)GeQ_(12)]^(5−)layer is composed of the honeycomb-like(Ga/Ge)_(18)Q_(42)rings containing(Ga/Ge)_(3)Q_(9)trimer as basic *** band gaps of the two compounds are 3.90 and 2.89 eV,respectively.[Cs_(6)Cl][Ga_(5)GeS_(12)]exhibits interesting two-band emission properties which are related to the intermediate-band electronic structure revealed by density functional theory(DFT)*** to the porous layered structure,[Cs_(6)Cl][Ga_(5)GeS_(12)]exhibits topological ion exchange ability towards Cd^(2+)ions with the maximum sorption capacity of 250 mg/g and high distribution coefficient(Kd)near 106 mL/*** work further enriches the structural diversity of salt-inclusion materials and extends their potential application range to ion exchange adsorption.

关键词： heteroanionic compound layered structure two-band emission ion exchange properties

Stereoselective Synthesis of δd-Selanyl Allylic Alcohols by Hydrozirconation of Propargyl Selenides

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Chinese Chemical Letters 2003年第3期14卷 255-256页

作者： Mei hua XIE xian huang 等 DepartmentofChemistry ZhejiangUniversityXi-xiCampushangzhou310028 StateKeyLaboratoryofOrganometallicChemistry ShanghaiInstituteofOrganicChemistryChineseAcademyofSciencesShanghai

Hydrozirconation of propargyl selenides afford (E)-3-selanyl vinylzirconocenes chlorides 2. Intermediates 2 reacted with aldehydes to obtain d-selanyl allylic alcohols.

关键词： Hydrozirconation propargyl selenides aldehydes allylic alcohols.

盐酸维拉帕米(注射用)细菌内毒素检查方法建立

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中国药业 2025年第1期34卷 73-77页

作者：黄宪莫玉焕广西壮族自治区药品检验研究院广西南宁530021

目的建立盐酸维拉帕米(注射用)细菌内毒素的检查方法。方法按2020年版《中国药典(四部)》通则1143细菌内毒素检查法及指导原则9251细菌内毒素检查法应用指导原则,分别采用凝胶法、动态浊度法、动态显色法对3批样品中细菌内毒素的检测方... 详细信息

目的建立盐酸维拉帕米(注射用)细菌内毒素的检查方法。方法按2020年版《中国药典(四部)》通则1143细菌内毒素检查法及指导原则9251细菌内毒素检查法应用指导原则,分别采用凝胶法、动态浊度法、动态显色法对3批样品中细菌内毒素的检测方法进行干扰试验,确定不干扰浓度,对盐酸维拉帕米(注射用)进行细菌内毒素检测。结果凝胶法稀释40倍可去除干扰,动态浊度法稀释400倍的细菌内毒素回收率为122.15%~141.76%,动态显色法稀释400倍的细菌内毒素回收率为83.25%~95.02%,3批样品的细菌内毒素检测结果均符合规定。结论凝胶法、动态浊度法、动态显色法均可用于盐酸维拉帕米(注射用)的细菌内毒素检查。

关键词：盐酸维拉帕米(注射用) 细菌内毒素凝胶法动态浊度法动态显色法干扰试验

基于互补约束和绝对值线性化松弛的日前无功计划优化

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电力系统自动化 2025年第3期49卷 156-169页

作者：黄华徐泰山高宗和柏琳陆进军涂孟夫电网运行风险防御技术与装备全国重点实验室江苏省南京市211106 国电南瑞科技股份有限公司江苏省南京市211106 国网电力科学研究院有限公司(南瑞集团有限公司) 江苏省南京市211106

为高效求解大规模非线性含多时段耦合绝对值约束和整数变量的日前无功计划优化问题,提出了一种基于互补约束和绝对值线性化松弛的两阶段优化算法。通过线性化方法松弛多时段耦合绝对值约束,并基于互补条件和离散变量等价转换,将原问题... 详细信息

为高效求解大规模非线性含多时段耦合绝对值约束和整数变量的日前无功计划优化问题,提出了一种基于互补约束和绝对值线性化松弛的两阶段优化算法。通过线性化方法松弛多时段耦合绝对值约束,并基于互补条件和离散变量等价转换,将原问题转换为含互补约束的连续数学规划问题。将求解步骤分为两个阶段,并采用内点法依次求解。首先,不计互补约束,快速获得离散变量近似优化解;然后,求解含互补约束的完整模型以获得离散变量和连续变量的精确优化解。此外,为减少内点法迭代时综合海森矩阵的计算量,提出了一种快速稀疏存储计算方法。IEEE 118节点等标准测试系统和实际省级电网的仿真结果表明了所提算法的有效性、快速性及其在实际大规模电力系统的工程适用性。

关键词：日前无功计划动态无功优化混合整数规划绝对值线性化松弛互补约束内点法

Homoclinic Solutions for a Class of Second Order Discrete Hamiltonian Systems

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Acta Mathematica Sinica,English Series 2012年第3期28卷 609-622页

作者： xian hua TANG Xiao Yan LIN School of Mathematical Sciences and Computing Technology Central South University Department of Mathematics Huaihua College

Consider the second order discrete Hamiltonian systems

关键词： Homoclinic solution discrete Hamiltonian system critical point

High-quality voice conversion system based on GMM statistical parameters and RBF neural network

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The Journal of China Universities of Posts and Telecommunications 2014年第5期21卷 68-75,93页

作者： CHEN xian-tong ZHANG Ling-hua College of Telecommunications and Information Engineering Nanjing University of Posts and Telecommunications

A voice conversion （VC） system was designed based on Gaussian mixture model （GMM） and radial basis function （RBF） neural network. As a voice conversion model, RBF network needs quantities of training data to improve its performance. For one speech, the networks trained by different segments of data have different transformation effects. Since trying segment by segment to obtain the best conversion effect is complex, a conversion method was proposed, that uses GMM for statistics before training RBF network to aim at the problem. The speech transformation and representation using adaptive interpolation of weighted spectrum （STRAIGHT） model is used for accurate extraction of vocal tract spectrum. Then GMM is used to classify the numerous spectral parameters. The obtained mean parameters were trained in RBF network. Experiment reveals that, the soft classification ability of GMM can promptly realize the reduction and classification of training data under the premise of ensuring the training effect. The selection complexity is decreased thereafter. Compared to the conventional RBF network training methods, this method can make the transformation of spectral parameters more effective and improve the quality of converted speech.

关键词： VC system STRAIGHT vocal tract spectrum GMM RBF