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Journal of Magnesium and Alloys 2023年第9期11卷 3200-3213页

作者： T.Nakata C.Xu l.Geng S.Kamado Nagaoka University of Technology 1603-1KamitomiokaNagaoka 940-2188Japan School of Materials Science and Engineering Harbin Institute of Technology Harbin 150001China

The origin of unique parallel alignment of(0001) poles to transverse direction(TD) was investigated using Mg-3Al-0.4Mn(mass%)alloy sheets rolled with different process conditions. When rolling was performed with intermediate reheating, the alloy showed a sluggish static recrystallization(SRX) behavior during post-annealing, facilitating the nucleation and growth of statically recrystallized grains from extension twins. This resulted in the apparent texture component with the parallel alignment of the(0001) poles to the TD, and the sheet exhibited good ductility for both the rolling direction(RD) and TD. In contrast, continuous rolling without intermediate reheating led to the formation of severely deformed regions near double twins. SRX was promoted at such regions, forming a typical basal textural feature with weak RD-split of the(0001) poles. Although extension twins were formed after the continuous rolling, SRX was facilitated at the severely deformed regions with double twins, and the formation of the unique alignment of the(0001) poles to the TD was suppressed. The RD-split texture led to the large elongation to failure along the RD, while it along the TD decreased owing to the narrow distribution of the(0001)poles toward the TD, resulting in the in-plane anisotropy in ductility.

关键词： Magnesium Rolling Twinning Static recrystallization Texture

多触指刀闸式接地开关短路关合过程动稳定性仿真分析

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电器与能效管理技术 2024年第5期 75-81页

作者：万永峰吕鹏瑞郭鹏 91526部队广东湛江524000 上海电器科学研究所(集团)有限公司上海200063

接地开关是电力系统中使用量较大、应用较广的设备之一,其稳定性与可靠性对电网的运行安全起着重要作用。仿真研究多触指刀闸式接地开关短路关合过程的动稳定性。首先搭建接地开关短路关合故障系统模型,分析接地开关载流特点;其次以接... 详细信息

接地开关是电力系统中使用量较大、应用较广的设备之一,其稳定性与可靠性对电网的运行安全起着重要作用。仿真研究多触指刀闸式接地开关短路关合过程的动稳定性。首先搭建接地开关短路关合故障系统模型,分析接地开关载流特点;其次以接地开关为物理模型,分析关合过程状态并进行短路电流时域匹配;最后对接地开关关合过程中的动稳定性进行仿真分析。结果表明,接地开关短路电流时域匹配法可以分析接地开关关合过程中短路电流对动稳定性的影响,为大容量接地开关结构设计研发提供参考。

关键词：接地开关关合能力动稳定性时域匹配法

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Microstructure,Properties and Wear Behaviors of (Ni_3Al)_p Reinforced Cu Matrix Composites

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Journal of Materials Science & Technology 2011年第10期27卷 937-943页

作者： Ibrahim elikyrek Nese .Krpe Tugba ler Remzi Grler Metallurgical and Materials Engineering Department Faculty of Engineering and ArchitectureEski sehir Osmangazi University Institute of Metallurgy Eski sehir Osmangazi University

Pure copper and its composites reinforced with Ni3Al particles were produced by powder metallurgy （PM）. Ni3Al powders were produced by mechanical ball milling from vacuum arc melted compounds. The Ni3Al powders were characterized by X-ray diffraction （XRD）. The microscopy examinations revealed that the Ni3Al particles were distributed uniformly in the matrix. The effects of the particle fraction on the density, electrical conductivity, strength and dry sliding wear resistance of composite were investigated. It was found that the density and electrical conductivity of the composites decrease while the compression yield strength and wear resistance of composites increase with an increase in the particle fraction. The dry sliding wear tests were performed with pin-on-disk geometry. After sliding wear tests, the worn surfaces were examined by scanning electron microscopy （SEM） equipped with an energy dispersive X-ray spectrometer （EDS）. Results have shown that the wear mechanism is oxidative and adhesive.

关键词： Metal matrix composites Powder metallurgy Wear Intermetallics

Mitochondria as a therapeutic:a potential new frontier in driving the shift from tissue repair to regeneration

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Regenerative Biomaterials 2023年第1期10卷 1332-1355页

作者： Evan N.Main Thaiz M.Cruz Gary l.Bowlin Department of Biomedical Engineering University of Memphis330 Engineering Technology BuildingMemphisTN 38152USA

Fibrosis,or scar tissue development,is associated with numerous pathologies and is often considered a worst-case scenario in terms of wound healing or the implantation of a *** that remains is a disorganized,densely packed and poorly vascularized bundle of connective tissue,which was once functional *** creates a significant obstacle to the restoration of tissue function or integration with any ***,it is of paramount importance in tissue engineering and regenerative medicine to emphasize regeneration,the successful recovery of native tissue function,as opposed to repair,the replacement of the native tissue(often with scar tissue).A technique dubbed‘mitochondrial transplantation’is a burgeoning field of research that shows promise in in vitro,in vivo and various clinical applications in preventing cell death,reducing inflammation,restoring cell metabolism and proper oxidative balance,among other reported ***,there is currently a lack of research regarding the potential for mitochondrial therapies within tissue engineering and regenerative ***,this review explores these promising findings and outlines the potential for mitochondrial transplantation-based therapies as a new frontier of scientific research with respect to driving regeneration in wound healing and host-biomaterial interactions,the current successes of mitochondrial transplantation that warrant this potential and the critical questions and remaining obstacles that remain in the field.

关键词： mitochondrial transplantation host-biomaterial integration biomaterials wound healing fibrosis

Preparation of stimuli-responsive nano-sized capsules based on cyclodextrin polymers with redox or light switching properties

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Nano Research 2016年第7期9卷 2070-2078页

作者： Ewelina Wajs Thorbjorn T. Nielsen Kim l. larsen Alex Fragoso Nanobiotechnology & Bioanalysis Group Departament d'Enginyeria Quimica Universitat Rovira i Virgili Avinguda Paisos Catalans 26 43007 Tarragona Spain Department of Chemistry and Biosciences Aalborg University Frederik Bajers Vej 7H 9220 Aalborg SO Denmark

We report the preparation and encapsulation properties of stimuli-responsive nanocapsules, self-assembled by the noncovalent interactions of cyclodextrin- appended polymers （host） and complementary ferrocene or azobenzene carriers （guest）. The encapsulation process was significantly accelerated by applying （electro） chemical or light stimulus, enabling the easier and faster diffusion of guest molecules through the polymer layers. The nanocapsules were characterized by dynamic light scattering, confocal microscopy, ESEM, AFM, W-visible and fluorescence spectroscopy, and electrochemical techniques. The encapsulation and release properties of the nanocapsules were reversible and could be repeated several times, indicating that the prepared nanoassemblies are very stable.

关键词： nanocapsule cyclodextrin,ferrocene,azobenzene,stimuli-responsive materials,encapsulation

Prime waterfront real estate： Apple snails choose wild taro for oviposition sites

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Current Zoology 2011年第5期57卷 630-641页

作者： Colin H. KYlE Alexis W. KROPF Romi l. BURKS Department of Ecology and Evolution University of Chicago Chicago IL 60637 USA Department of Biology Southwestern University Georgetown TX 78626 USA

While difficult to prevent introductions, scientific research can help guide control efforts of exotic, invasive species. South American island apple snails Pomacea insularum have quickly spread across the United States Gulf Coast and few control measures exist to delay their spread. Usually occupying cryptic benthic habitats, female apple snails crawl out of the water to de-posit large, bright pink egg clutches on emergent objects. To help identify the most likely place to find and remove clutches, we conducted four lab experiments to investigate what specific object qualifies （i.e. material; shape and height; plant species; natural and artificial） attracted P. insularum females to lay clutches. In our fourth experiment, we specifically examined the relationship between female size and reproductive output. To further understand reproductive output, we quantified experimental clutch chara-cteristics （height above water, dimensions, mass, approximate volume, number of eggs, hatching efficiency）. Pomacea insu-larum females laid more clutches on plant material, chose round over flat surfaces and failed to differentiate between tall and short structures. In comparison to a common native plant in the eastern US, Pontederia cordata, snails clearly preferred to lay clutches on a widely distributed exotic, invasive plant （wild taro, Colocasia esculenta）. Unexpectedly, smaller snails showed higher overall total fecundity as well as more eggs per clutch than larger snails. Therefore, hand removal efforts of large fe-males may not be enough to slow down clutch production. Collectively, our results indicate that conservationists and managers should search emergent plants for P. insularum clutches carefully to guard against established populations [Current Zoology 57 （5）： 630-641, 2011].

关键词： Colocasia Wild taro Fecundity Substrate Reproduction Facilitation

Effects of common prebiotics on iron status and production of colonic short-chain fatty acids in anemic rats

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Food Science and Human Wellness 2021年第3期10卷 327-334页

作者： Fan Zhang Ken K.l.Yung Chi KongYeung Division of Science and Technology BNU-HKBU United International CollegeZhuhaiGuangdongChina Department of Biology Hong Kong Baptist UniversityHong KongChina Animal Science Department California Polytechnic State UniversitySan Luis ObispoCaliforniaUSA

Prebiotics may enhance iron absorption,and one plausible mechanism involves the production of shortchain fatty acids(SCFA)in the colon by intestinal *** objectives of this study were to determine the effects of common commercially-available prebiotics including fructooligosaccharide(FOS),inulin,FOS-inulin mixture,galactooligosaccharide(GOS),and lactulose on the iron status of anemic rats,and to monitor changes in the production of colonic *** Sprague-Dawley rats receiving a lowiron diet(12μg Fe/g diet)were supplemented with or without prebiotics(5%m/V in drinking water)for 5 *** concentration in rats supplemented with GOS after 3 weeks(4.3 g/dl)was significantly higher than rats without supplementation(3.7 g/dl),while FOS also significantly increased hemoglobin concentration after 4 weeks(4.1 g/dl vs.3.7 g/dl).All other prebiotics showed no *** rats showed lower overall SCFA production in the colon than normal rats,and only FOS signifi cantly increased the production of the three main SCFA(acetic acid,propionic acid and isobutyric acid)identifi ed in anemic rats,with other prebiotics showing no noticeable *** results suggest that GOS and FOS may slightly improve iron status of anemic rats,but the role of SCFA in the colon is not clear.

关键词： Iron Non-digestible oligosaccharides Short-chain fatty acids Prebiotics Rat

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基于CNN-lSTM的锂离子SOC估计

电气传动 2024年第2期54卷 26-31页

作者：刘娟雷辉吕金王洋徐德树天津电气科学研究院有限公司天津300180 电气传动国家工程研究中心天津300180 陕西龙门钢铁有限责任公司陕西韩城715400 天津天传电气传动有限公司天津300301

电池荷电状态(SOC)是锂离子电池管理技术中最重要的参数之一,高精度的SOC估计有利于储能电站的并网和控制。电池充放电数据不仅具有时序性,特征变量之间也存在一定空间关系,为提高估算方法的准确性和通用性,提出一种基于CNN-lSTM联合网... 详细信息

电池荷电状态(SOC)是锂离子电池管理技术中最重要的参数之一,高精度的SOC估计有利于储能电站的并网和控制。电池充放电数据不仅具有时序性,特征变量之间也存在一定空间关系,为提高估算方法的准确性和通用性,提出一种基于CNN-lSTM联合网络结构的锂离子电池SOC估计方法,先通过CNN特征提取获取了锂离子电池不同维度数据间的特征关系,然后经过lSTM网络结构提取其中的时间序列关系,联合网络充分获取了电池数据集的空间时间特性。实验结果表明,基于CNN-lSTM联合网络模型预测电池SOC平均误差控制在0.65%,较单独的CNN网络预测平均误差降低4.4%左右,较单独的lSTM网络预测的平均误差降低0.2%左右,具有较好的应用前景。

关键词：锂离子电池电池荷电状态卷积神经网络长短期记忆网络

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δ-WAVE FOR 1-D AND 2-D HYPERBOlIC SYSTEMS

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Journal of Computational Mathematics 1996年第3期14卷 256-262页

作者： S.l. Yang(Institute of Applied Mathematics, Chinese Academy of Sciences, Beijing, China) CHINESE ACAD SCI INST APPL MATHBEIJINGPEOPLES R CHINA

Here a new kind of nonlinear wave, which is called δ-wave, is described by some high resolution difference solutions for Riemann problems of one-dimensional (1-D) and two-dimensional (2-D) nonlinear hyperbolic systems in conservation laws. Some phenomena are numerically shown for the solutions of Riemann problems for 2-D gas dynamics systems

关键词： Zhang WAVE FOR 1-D AND 2-D HYPERBOlIC SYSTEMS

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晶体电光调制实验中常见“故障”诊断

大学物理实验 2024年第2期37卷 17-20页

作者：赵卉杨振清吕志清中国石油大学(北京)理学院北京102249

为了加深操作者对实验的理解,并通过实验学会对偏振光和非线性光学等知识的应用,从实验的原理入手,揭示了晶体电光调制实验中经常出现的“故障”原因,并提出解决方案。第一,实验中输出信号出现的绝大部分问题,都可以归结为光路没有达到... 详细信息

为了加深操作者对实验的理解,并通过实验学会对偏振光和非线性光学等知识的应用,从实验的原理入手,揭示了晶体电光调制实验中经常出现的“故障”原因,并提出解决方案。第一,实验中输出信号出现的绝大部分问题,都可以归结为光路没有达到最佳状态。此时可以通过观察干涉圆环图样进行初步判断,再用“两平行一正交”的法则对光路进行调节。第二,输出电压增量ΔV与入射光强I_(0)成正比例变化,和调制信号幅度成反比例变化。据此可以有效地将输出电压的增量控制在合理范围内,保证实验的成效。第三,当起偏器和检偏器平行时,增加偏压后输出电压不增反降。

关键词：晶体电光调制锥光干涉圆环偏振