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Multi-segmented nanowires for vortex magnetic domain wall racetrack memory

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Chinese Physics B 2023年第12期32卷 582-588页

作者： M Al Bahri M Al Hinaai t Al Harthy Department of Basic Sciences A'Sharqiyah UniversityPost Box 42PC 400IbraOman

A vortex domain wall's(VW) magnetic racetrack memory's high performance depends on VW structural stability,high speed, low power consumption and high storage density. In this study, these critical parameters were investigated in magnetic multi-segmented nanowires using micromagnetic simulation. thus, an offset magnetic nanowire with a junction at the center was proposed for this purpose. this junction was implemented by shifting one portion of the magnetic nanowire horizontally in the x-direction(l) and vertically(d) in the y-direction. the VW structure became stable by manipulating magnetic properties, such as magnetic saturation(M_(4)) and magnetic anisotropy energy(K_(u)). In this case, increasing the values of M_(4) ≥ 800 kA/m keeps the VW structure stable during its dynamics and pinning and depinning in offset nanowires,which contributes to maintenance of the storage memory's lifetime for a longer period. It was also found that the VW moved with a speed of 500 m/s, which is desirable for VW racetrack memory devices. Moreover, it was revealed that the VW velocity could be controlled by adjusting the offset area dimensions(l and d), which helps to drive the VW by using low current densities and reducing the thermal-magnetic spin fluctuations. Further, the depinning current density of the VW(J_(d)) over the offset area increases as d increases and l decreases. In addition, magnetic properties, such as the M_(4) and K_(u),can affect the depinning process of the VW through the offset area. For high storage density, magnetic nanowires(multisegmented) with four junctions were designed. In total, six states were found with high VW stability, which means three bits per cell. Herein, we observed that the depinning current density(J_(d)) for moving the VW from one state to another was highly influenced by the offset area geometry(l and d) and the material's magnetic properties, such as the M_(4) and K_(u).

关键词： micromagnetic simulation vortex domain wall racetrack memory multi-segmented magnetic nanowire spin transfer torque

Endoscopy in the Philippines

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中国消化内镜 2008年第9期2卷 42-43页

作者： Jonard t.Co University of Santo tomas Hospital Chinese General Hospital and Medical Center Metropolitan Medical Center

Endoscopy has gained fame and acceptance due toits proven value in its diagnostic and therapeuticaspects. Quality levels of endoscopy practice hasbeen benchmarked as the the only way to

关键词：内镜消化系统诊断方法治疗方法

FOSt PALEOZOIC FORMAtIONS OF tHE MN YIN AND LAI WU VALLEYS OF SHANtUNG.

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地质学报 1923年第Z1期 29-33页

作者： H.C.t’AN

INtRODUCtION. I was appointed to accompany Dr. J. G. Andersson to take a trip incentral Shantung. especially in Men Yin (蒙阴) and Lai Wu (莱芜),valleys,for the purpose of collecting fossils and observing the post-Pal... 详细信息

关键词： FOSt PAL N YIN AND LAI WU VALLEYS OF SHANtUNG EOZOIC FORMAtIONS OF tHE M

Does glioblastoma cyst fluid promote sciatic nerve regeneration?

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Neural Regeneration Research 2015年第10期10卷 1643-1649页

作者： Rafet ?zay Abit Akta? Mevlüt ?zgür ta?kap?l?o?lu Bora Gürer Bülent Erdo?an Yusuf ?ükrü ?a?lar Department of Neurosurgery Diskapi Y?ld?r?m Beyaz?t Educational and Research Hospital Department of Histology and Embryology Faculty of Veterinary Medicine Istanbul University Department of Neurosurgery School of Medicine Uluda? University Fatih Sultan Mehmet Education and Research Hospital Department of Neurosurgery School of Medicine Fatih University Department of Neurosurgery School of Medicine Ankara University

Glioblastoma cyst fluid contains growth factors and extracellular matrix proteins which are known as neurotrophic and neurite-promoting agents. therefore, we hypothesized that glioblastoma cyst fluid can promote the regeneration of injured peripheral nerves. to validate this hypothesis, we transected rat sciatic nerve, performed epineural anastomosis, and wrapped the injured sciatic nerve with glioblastoma cyst fluid- or saline-soaked gelatin sponges. Neurological function and histomorphological examinations showed that compared with the rats receiving local saline treatment, those receiving local glioblastoma cyst fluid treatment had better sciatic nerve function, fewer scars, greater axon area, counts and diameter as well as fiber diameter. these findings suggest that glioblastoma cyst fluid can promote the regeneration of injured sciatic nerve and has the potential for future clinical application in patients with peripheral nerve injury.

关键词： nerve regeneration peripheral nerve injury sciatic nerve injury cyst fluid glioblastoma growth factors neural regeneration

Compositional complexity dependence of dislocation density and mechanical properties in high entropy alloy systems

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Progress in Natural Science:Materials International 2020年第4期30卷 545-551页

作者： P.thirathipviwat G.Song J.Bednarcik U.Kühn t.Gemming K.Nielsch J.Han Leibniz Institute of Solid State and Materials Research (IFW Dresden) Frontier Research Center for Applied Atomic Sciences Ibaraki University Division of Advanced Materials Engineering and Institute for rare metals Kongju National University Institute of Physic Pavol Jozef Safarik University in Ko?ice Deutsches Elektronen-Synchrotron (DESY) Institute of Materials Science Technische Universit?t Dresden Institute of Applied Physics Technische Universit?t Dresden korea Institute for Rare Metals Korea Institute of Industrial Technology (KITECH)

this study focuses on a quantitative analysis of dislocation accumulation after cold plastic deformation and mechanical properties of Fe Ni Co Cr Mn and ti Nb Hf ta Zr high entropy alloys(HEAs) which are single phase fcc and bcc solid solutions, respectively. In order to study the role of compositional complexity from unary to quinary compositions on dislocation accumulation and mechanical properties after plastic deformation, the single solid solution phase forming sub-alloys of the two HEAs were investigated. All studied samples revealed a large plastic deformability under cold-rotary swaging process by 85–90% area reduction without intermediate annealing. the dislocation density of all studied samples, determined by Williamson-Hall method on synchrotron X-ray diffraction patterns, were between 1014-1015m-2dependent on the alloy composition. the level of dislocation density after plastic deformation is not only affected by the number of constituent element but the lattice distortion and intrinsic properties in terms of stacking fault energy, modulus misfit, and melting point also impact the dislocation storage. the level of dislocation density determines the level of mechanical properties because of a resistance to dislocation motions. the hardness and yield compressive strength of the studied samples are proportional to the level of dislocation density.

关键词： High entropy alloys Dislocation density Synchrotron XRD Mechanical properties

the Shanghai Connection: Ingredients for a Successful International Collaboration

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上海精神医学 1992年第S1期 37-41页

作者： William t. Liu

the Shanghai Study of Alzheimer’s Disease and Dementia is one of the most successful multidisciplinary U.S.-China collaborative research project. In this article, the author recalls the events which led to the verbal agreement to collaborate and discusses the major ingredients for a successful international research project. these include: mutual trust between collaborating investigators, not treating the local investigators as hired hands, pledge of support in research technology transfers and manpower training, strong leadership support in Shanghai, and respect for the research interest of one’s colleagues. the cooperation model of collaboration is better in executing complex international research projects than that of an authority-based research organization which encourages aggressive competition.

关键词： UCSD

Green-synthetized selenium nanoparticles using berberine as a promising anticancer agent

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Journal of Integrative Medicine 2022年第1期20卷 65-72页

作者： Mohamed S.Othman Sofian t.Obeidat Amal H.Al-Bagawi Mohamed A.Fareid Alaa Fehaid Ahmed E.Abdel Moneim Basic Sciences Department Deanship of Preparatory YearUniversity ofHa'ilHail 2240Saudi Arabia Faculty of Biotechnology October University for Modem Science and ArtsGiza 12451Egypt Chemistry Department Faculty of ScienceUniversity of Ha%Hail 2240Saudi Arabia Department of Botany and Microbiology Faculty of ScienceAl-Azhar UniversityCairo 35527Egypt Forensic Medicine and toxicology Department Faculty of Veterinary MedicineMansoura UniversityDakahlia 35516Egypt Zoology and Entomology Department Faculty of ScienceHelwan UniversityCairo 11795Egypt

Objective: the chemo-preventative and therapeutic properties of selenium nanoparticles(se NPs) have been documented over recent decades and suggest the potential uses of se NPs in medicine. Biogenic se NPs have higher biocompatibility and stability than chemically synthesized nanoparticles, which enhances their medical applications, especially in the field of cancer therapy. this study evaluated the potential of green-synthetized se NPs by using berberine(Ber) as an antitumor agent and elucidated the mechanism by which these molecules combat Ehrlich solid tumors(ESts).Methods: se NPs containing Ber(se NPs-Ber) were synthesized using Ber and Na2 se O3 and characterized with Fourier transform infrared spectroscopy. Sixty male Swiss albino mice were then acclimatized for one week, injected with Ehrlich ascites tumor cells, and divided into four groups: ESt, ESt + cisplatin(5 mg/kg), ESt + Ber(20 mg/kg), and ESt + se NPs-Ber(0.5 mg/kg). At the end of a 16-day observation period, 12 mice from each group were euthanized to analyze differences in the body weight, tumor size,gene expression, and oxidative stress markers in the four groups. three mice from each group were kept alive to compare the survival ***: treatment with se NPs-Ber significantly improved the survival rate and decreased the body weight and tumor size, compared to the ESt group. se NPs-Ber reduced oxidative stress in tumor tissue,as indicated by a decrease in the lipid peroxidation and nitric oxide levels and an increase in the glutathione levels. Moreover, se NPs-Ber activated an apoptotic cascade in the tumor cells by downregulating the B-cell lymphoma 2(Bcl-2) expression rate and upregulating the Bcl-2-associated X protein and caspase-3 expression rates. se NPs-Ber also considerably improved the histopathological alterations in the developed tumor tissue, compared to the ESt ***: Our study provides a new insight into the potential role of green-synthesized se NPs by using Ber as

关键词： selenium nanoparticles Berberine Ehrlich solid tumor Oxidative stress Apoptosis

亚致死剂量UV-C辐照抑制铜绿微囊藻生长的效果

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清华大学学报（自然科学版） 2010年第9期50卷 1412-1415页

作者：陶益毛献忠张锡辉袁侃 Doris W t Au 清华大学深圳研究生院环境工程与管理研究中心深圳518055 香港城市大学生物与化学系香港

铜绿微囊藻是中国典型的水华蓝藻。该文研究亚致死剂量短波紫外线（UV-C）辐照对其生长的抑制效果。采用准平行光束仪进行定量辐照处理,用共聚焦激光扫描显微镜进行藻细胞计数,用流式细胞术识别藻细胞膜完整性,三维荧光光谱分析藻蓝蛋... 详细信息

铜绿微囊藻是中国典型的水华蓝藻。该文研究亚致死剂量短波紫外线（UV-C）辐照对其生长的抑制效果。采用准平行光束仪进行定量辐照处理,用共聚焦激光扫描显微镜进行藻细胞计数,用流式细胞术识别藻细胞膜完整性,三维荧光光谱分析藻蓝蛋白及叶绿a的相对荧光水平。结果表明：对初始密度为106个/mL铜绿微囊藻,UV-C辐照能抑制藻细胞生长,亚致死剂量范围是50-100 mJ/cm^2,抑制效果可以持续7 d。

关键词：铜绿微囊藻亚致死剂量UV-C辐照生长抑制细胞膜完整性湖泊

INNERVAtION OF tHE AURICULAR MUSCULAtURE At tHE BAse OF INseRtION OF tHE AtRIO-VENtRICULAR VALVES

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Science China Mathematics 1952年第1期 102-106页

作者： K.t.tCHENG Institute of Physiology and Biochemistry Academia Sinica

Summary the musculature at the base of insertion of the atrio-ventricular values of the dog’s heart receives a notable amount of autonomic nervous fibers. the majority of these fibers end in metaterminal apparatuses ... 详细信息

关键词： INNERVAtION OF tHE AURICULAR MUSCULAtURE At tHE BAse OF INseRtION OF tHE AtRIO-VENtRICULAR VALVES