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立方晶体Bi_(12) GeO_(20) 的三阶弹性常数(英文)

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中国科学技术大学学报 2001年第2期31卷 197-201页

作者： wu kun-yu SHAO Ji-hong 吴昆裕邵继红 Department of Electronic Engineering and Information Science USTC合肥230026 中国科学技术大学电子工程与信息科学系

用超声脉冲回波重合方法测量了立方晶体Bi12 GeO2 0 中九种不同模式纯纵波和切变波自然声速值随流体静压力和单轴压力的变化关系 ,由此实验结果 ,用Thurston和Brugger的理论 ,确定了Bi12 GeO2 0 晶体全部独立的三阶弹性常数 .

关键词：立方晶体 Bi12GeO20 三阶弹性常数声速

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接种微生物对煤矿废弃基质的改良与培肥作用

煤炭学报 2006年第3期31卷 365-368页

作者：毕银丽吴福勇武玉坤中国矿业大学(北京)资源与安全工程学院北京100083

针对煤矿废弃物煤矸石和粉煤灰生态治理难的特点,将它们作为生物基质来进行利用将是一种很好的途径,通过接种菌根真菌与根瘤菌,对废弃基质进行生物改良,结果表明,植物根系对基质理化性状有一定的改良与培肥作用,提高了基质pH和EC值,使... 详细信息

针对煤矿废弃物煤矸石和粉煤灰生态治理难的特点,将它们作为生物基质来进行利用将是一种很好的途径,通过接种菌根真菌与根瘤菌,对废弃基质进行生物改良,结果表明,植物根系对基质理化性状有一定的改良与培肥作用,提高了基质pH和EC值,使之更趋近于植物正常生长的酸碱范围.两种微生物都能够与植物形成较好的共生关系,长期种植豆科植物有利于基质中N的积累.双接根瘤菌和AM菌根真菌促进了植株对煤矿区固体废弃物中难溶性P的吸收和利用.

关键词：微生物煤矿废弃物改良与培肥

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融合特征值与优化划分的改进FCM聚类算法

计算机工程与设计 2017年第4期38卷 1076-1080页

作者：武玉坤浙江邮电职业技术学院管理与信息学院浙江绍兴312016

通过研究传统FCM和改进FCM算法,针对现有算法中存在收敛速度不够、聚类精度不高等问题,提出一种基于FCM算法的融合特征值和优化划分FCM的改进聚类算法。融合优化划分与特征值,获取特征值向量迭代计算公式,实现自适应更新。实验结果表明... 详细信息

通过研究传统FCM和改进FCM算法,针对现有算法中存在收敛速度不够、聚类精度不高等问题,提出一种基于FCM算法的融合特征值和优化划分FCM的改进聚类算法。融合优化划分与特征值,获取特征值向量迭代计算公式,实现自适应更新。实验结果表明,该方法能够有效计算并获取样本特征值向量,改进算法聚类分析效果优于FCM、W-FCM、OP-FCM算法,所提改进算法具有实际应用价值。

关键词：模糊聚类算法特征值优化划分聚类精度迭代计算公式

Dynamic Regulation of Hydrogen Bonding Networks and Solvation Structures for Synergistic Solar‑Thermal Desalination of Seawater and Catalytic Degradation of Organic Pollutants

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Nano-Micro Letters 2025年第2期17卷 548-565页

作者： Ming‑yuan yu Jing wu Guang Yin Fan‑Zhen Jiao Zhong‑Zhen yu Jin Qu Beijing Key Laboratory of Advanced Functional Polymer Composites Beijing University of Chemical TechnologyBeijing 100029People’s Republic of China State Key Laboratory of Organic‑Inorganic Composites College of Materials Science and EngineeringBeijing University of Chemical TechnologyBeijing 100029People’s Republic of China

Although solar steam generation strategy is efficient in desalinating seawater,it is still challenging to achieve continuous solar-thermal desalination of seawater and catalytic degradation of organic ***,dynamic regulations of hydrogen bonding networks and solvation structures are realized by designing an asymmetric bilayer membrane consisting of a bacterial cellulose/carbon nanotube/Co_(2)(OH)_(2)CO_(3)nanorod top layer and a bacterial cellulose/Co_(2)(OH)_(2)CO_(3)nanorod(BCH)bottom ***,the hydrogen bonding networks inside the membrane can be tuned by the rich surface–OH groups of the bacterial cellulose and Co_(2)(OH)_(2)CO_(3)as well as the ions and radicals in situ generated during the catalysis ***,both SO_(4)^(2−)and HSO_(5)−can regulate the solvation structure of Na^(+)and be adsorbed more preferentially on the evaporation surface than Cl^(−),thus hindering the de-solvation of the solvated Na^(+)and subsequent nucleation/growth of ***,the heat generated by the solar-thermal energy conversion can accelerate the reaction kinetics and enhance the catalytic degradation *** work provides a flow-bed water purification system with an asymmetric solar-thermal and catalytic membrane for synergistic solar thermal desalination of seawater/brine and catalytic degradation of organic pollutants.

关键词： Solar steam generation Seawater desalination Catalytic degradation Bacterial cellulose Cobalt hydroxycarbonate nanorods

Mechanism Study on the Effect of Retarder on Polyurethane Setting Time Based on Molecular Simulation

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Journal of wuhan University of Technology(Materials Science) 2025年第1期40卷 224-231页

作者： wu yuxuan XU Wenyuan yu Tianlai JI Yongcheng School of Civil Engineering Northeast Forestry UniversityHarbin 150040China

This study identified castor oil and phosphate ester as effective retarders through setting time,tensile,and flexural tests,and determined their optimal *** mechanism by which phosphate ester affects the setting time of polyurethane was further investigated using molecular dynamics *** transform infrared spectroscopy was also employed to systematically study the physical and chemical interactions between phosphate esters and polyurethane *** results demonstrate that a 1%concentration of phosphate ester provides the most effective retarding effect with minimal impact on the strength of *** phosphate ester is added to the B component of the two-component polyurethane system,its interaction energy with component A decreases,as do the diffusion coefficient and aggregation degree of component B on the surface of component *** reduction in interaction slows the setting ***,the addition of phosphate ester to polyurethane leads to the disappearance or weakening of functional groups,indicating competitive interactions within the phosphate ester components that inhibit the reaction rate.

关键词： polyurethane retarder setting time molecular dynamics diffusion coefficient

A new horizon for neuroscience:terahertz biotechnology in brain research

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维普期刊数据库

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Neural Regeneration Research 2025年第2期20卷 309-325页

作者： Zhengping Pu yu wu Zhongjie Zhu Hongwei Zhao Donghong Cui Shanghai Key Laboratory of Psychotic Disorders Shanghai Mental Health CenterShanghai Jiao Tong University School of MedicineShanghaiChina Department of Psychiatry Kangci Hospital of JiaxingTongxiangZhejiang ProvinceChina Shanghai Synchrotron Radiation Facility Shanghai Advanced Research InstituteChinese Academy of SciencesShanghaiChina Key Laboratory of Interfacial Physics and Technology Shanghai Institute of Applied PhysicsChinese Academy of ScienceShanghaiChina National Facility for Protein Science in Shanghai Shanghai Advanced Research InstituteChinese Academy of SciencesShanghaiChina

Terahertz biotechnology has been increasingly applied in various biomedical fields and has especially shown great potential for application in brain *** this article,we review the development of terahertz biotechnology and its applications in the field of *** evidence indicates promising prospects for the use of terahertz spectroscopy and terahertz imaging techniques in the diagnosis of amyloid disease,cerebrovascular disease,glioma,psychiatric disease,traumatic brain injury,and myelin *** vitro and animal experiments have also demonstrated the potential therapeutic value of terahertz technology in some neuropsychiatric *** the precise underlying mechanism of the interactions between terahertz electromagnetic waves and the biosystem is not yet fully understood,the research progress in this field shows great potential for biomedical noninvasive diagnostic and therapeutic ***,the biosafety of terahertz radiation requires further exploration regarding its two-sided efficacy in practical *** review demonstrates that terahertz biotechnology has the potential to be a promising method in the field of neuropsychiatry based on its unique advantages.

关键词： biological effect brain neuron neuropsychiatry neuroscience non-thermal effect terahertz imaging terahertz radiation terahertz spectroscopy terahertz technology

重庆三叠系碳酸盐岩热储热水水文地球化学特征

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长江流域资源与环境 2015年第8期24卷 1351-1357页

作者：肖琼王鹏伍坤宇中国地质科学院岩溶地质研究所国土资源部/广西岩溶动力学重点实验室广西桂林541004 西南大学地理科学学院重庆400715 中山大学地理与规划学院水资源与环境系广东广州510275

地下热水的水文地球化学特征研究有利于地下热水的开发,对重庆三叠系碳酸盐岩热储热水的研究可以更好地实现重庆地下热水的可持续开发。通过2009年1月和2009年7月对重庆市三叠系碳酸盐岩热储热水进行野外监测、取样和室内分析,发现重庆... 详细信息

地下热水的水文地球化学特征研究有利于地下热水的开发,对重庆三叠系碳酸盐岩热储热水的研究可以更好地实现重庆地下热水的可持续开发。通过2009年1月和2009年7月对重庆市三叠系碳酸盐岩热储热水进行野外监测、取样和室内分析,发现重庆三叠系碳酸盐岩热储热水水化学性质相近,pH呈中性,水温30℃~50℃,电导率为1 320μs/cm^3 250μs/cm,水化学类型为SO4-Ca(Mg)型,是典型的碳酸盐岩热储中-低温地下热水。温泉水的主要阳离子为Ca2+和Mg2+,阴离子为SO42-和HCO3-,除青木关温泉外,SO42-和Ca2+、Mg2+随时空变化较小,体现了碳酸盐岩中石膏与地下热水的水-岩作用对地下热水水文地球化学特征的控制。热水中的方解石和白云石都处于饱和与不饱和的临界状态,没有明显钙华沉积的现象;Na-K-Mg-Ca图解显示各个季节地下热水的物质来源基本一致,均没有达到水岩平衡状态。

关键词：三叠系碳酸盐岩地下热水水文地球化学特征水-岩作用

东西部扶贫协作:模式的研究与未来的发展——以北京市东西部扶贫协作为例

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贵州民族研究 2021年第3期42卷 87-95页

作者：万鹏飞吴雨坤北京大学政府管理学院北京100871

东西部扶贫协作是中国三大扶贫模式之一,是打赢脱贫攻坚战、实现先富帮后富、最终实现共同富裕目标的关键举措,对提高西部地区城乡居民收入、改善基础设施、增强综合实力起到了重要作用。基于文献研究与实地调研,以北京市为例,文章从基... 详细信息

东西部扶贫协作是中国三大扶贫模式之一,是打赢脱贫攻坚战、实现先富帮后富、最终实现共同富裕目标的关键举措,对提高西部地区城乡居民收入、改善基础设施、增强综合实力起到了重要作用。基于文献研究与实地调研,以北京市为例,文章从基本概念、历史沿革、体制机制等方面对东西部扶贫协作模式进行了系统深入的研究,对模式的未来发展作了前瞻性的探讨和展望。

关键词：扶贫东西部扶贫协作脱贫标准

Broadband and perfect terahertz absorber based on multilayer metamaterial with cross-ring patterned structures

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Optoelectronics Letters 2025年第1期21卷 1-6页

作者： WEN Jin LIU Zhanzhi wu Zhengwei PAN yu ZHANG Ying School of Science Xi'an Shiyou University Shaanxi Key Laboratory of Measurement and Control Technology for Oil and Gas Wells

Broadband and perfect terahertz absorber based on multilayer metamaterial using cross-ring patterned structures is proposed and investigated. The structure of the absorber is double absorption layers consisting of a chromium cross ring and eight isosceles right triangles. The unique structure of the double absorbing layers excites the electric dipole multimode resonance, giving rise to high absorption performance. Meanwhile, the influence of construal parameters on absorber behavior is also discussed. The numerical results show that the absorption achieves over 90% ranging from 2.45 THz to 6.25 THz and 99% absorption in the range of 3.7—5.3 THz. The realization of broadband and perfect absorber is described using the impedance matching principle. It is obviously found that the absorber is insensitive to the high angle of incidence for both transverse electric(TE) and transverse magnetic(TM) polarizations. Compared with the former reports, this absorber has remarkable improved absorption efficiency and smaller period. The terahertz absorber may be found applications in the fields of energy capture and thermal detection.

关键词： Metamaterials