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Towards high degree of c-axis orientation in MgB_(2) bulks

Journal of Magnesium and Alloys 2022年第8期10卷 2173-2184页

作者： M.A.Grigoroscuta G.v.Aldica M.Burdusel v.sandu A.Kuncser I.Pasuk A.M.Ionescu T.S.Suzuki O.vasylkiv P.Badica National Institute of Materials Physics 405A Street AtomistilorMagurele 077125Romania National Institute for Materials Science 1-2-1 SengenIbarakiTsukuba 305-0047Japan

The paper presents fabrication and characterization of spark plasma sintered textured(001) MgB_(2)with a record degree of orientation of about 40% and 16% by high-energy ultra-sonication and slip casting in high magnetic field(12 T) and 0 T magnetic field, *** characterization was performed by X-ray diffraction, and electron microscopy. The analysis revealed unexpected preferred orientation also in the MgO secondary phase due to the epitaxial growth of(111) MgO on(001) MgB_(2). The influence of oriented microstructure on the superconducting characteristics expressed by critical current density(J_(c)), irreversibility field(H_(irr)), and on the pinning properties were assessed. High anisotropy versus sample orientation in applied magnetic field, H, was observed for J_(c), Hirr, pinning activation energy(U^(*))extracted from relaxation measurements. The zero-field critical current, J_(c0)and F_(p),maxare weakly or not dependent on the direction of H,while the other indicated parameters are significantly influenced. Results enable control of superconducting parameters by further optimization of microstructure through MgB_(2) texturing as a novel and viable strategy for development of bulk MgB2with enhanced properties when taking advantage of its anisotropy.

关键词： Textured MgB_(2)bulk Slip casting Spark plasma sintering Critical current density Pinning force Pinning activation energy

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Magnetic properties of glass-ceramics obtained by crystallization of iron-rich borosilicate glasses

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Journal of Advanced Ceramics 2017年第3期6卷 251-261页

作者： v. sandu E. CIMPOIASU A. KUNCSER M. S. NICOLESCU National Institute of Materials Physics Bucharest Magurele 077125 Romania Department of Physics US Naval Academy Annapolis MD USA National Institute of Materials Physics Bucharest Magurele 077125 RomaniaFaculty of Physics Bucharest University Bucharest-Magurele 077125 Romania

The specific dynamic magnetic response and magnetic relaxation phenomena in magnetite-based glass-ceramics by controlled crystallization of Fe-rich borosilicate glasses with 25 wt% Fe2O3, in the presence of two types of nucleating agents, Cr2O3 and P2O5, were investigated. The magnetic response is complex and shows contributions arising from two subsystems: a system with collective characteristics, superspin-glass like, and another one with single particle characteristics (superparamagnetic) with dipolar interaction. The nucleating agents have strong influence on the characteristic temperatures and anisotropy energy.

关键词： magnetite glass-ceramics AC susceptibility magnetic relaxation nucleating agent

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Could there be an interplay between periodontal changes and pancreatic malignancies?

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World Journal of Clinical Cases 2023年第3期11卷 545-555页

作者： Bogdan Silviu Ungureanu Dorin Nicolae Gheorghe Flavia Mirela Nicolae sandu Ramboiu Petru Adrian Radu valeriu MarinȘurlin victor Dan Eugen Strambu Dan Ionut Gheonea Alexandra Roman PetraȘurlin Department of Gastroenterology University of Medicine and Pharmacy of CraiovaCraiova 200349Romania Department of Periodontology Research Center of Periodontal-Systemic ImplicationsUniversity of Medicine and Pharmacy of CraiovaCraiova 200349Romania Department 1st of Surgery University of Medicine and Pharmacy of CraiovaCraiova 200349Romania Department of General Surgery “Carol Davila”University of Medicine and PharmacyBucharest 020021Romania Department of Periodontology "Iuliu Hațieganu"University of Medicine and PharmacyCluj-Napoca 400012Romania

The term"periodontal disease"refers to a group of chronic inflammatory illnesses caused by specific microorganisms from subgingival biofilm,that affect the toothsupporting *** research has also shown that periodontal infection plays a role in aggravating systemic disease states at distal sites,reinforcing the significance of the oral cavity for general ***,it has been suggested that gastroenterological malignancies may be promoted by hematogenous,enteral or lymphatic translocation of *** the past 25 years,the global burden of pancreatic cancer(PC)has more than doubled,making it one of the major causes of cancer-related *** has been linked to at least 50%increased risk of PC and it could be considered a risk factor for this malignancy.A recent study performed on 59000 African American women with a follow up of 21 years showed that participants who had poor dental health had higher chances of *** findings,according to researchers,might be related to the inflammation that some oral bacteria *** the mortality of PC,periodontitis considerably raises the chance of dying from *** alterations in the gut,oral cavity and pancreatic tissues of PC patients occur when compared to healthy flora,demonstrating a link between PC and *** may also contribute to PC development,although the underlying pathway is not yet *** function of the microbiome in PC risk has drawn more focus over the last *** risk of PC has been linked to the oral microbiome,specifically increased levels of Porphyromonas gingivalis and Aggregatibacter actinomycetemcomitans and decreased relative abundance of Leptotrichia and Fusobacteria,suggesting that it may have an impact on the inflammatory condition by expanding,altering,and regulating the commensal *** who received periodontal treatment had significantly decreased incidence rate ratios for *** analyzing patterns in

关键词： Periodontal disease Pancreatic cancer Microbiome Periodontitis Periopathogens Periodontal medicine

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超声波辅助提取干制石榴皮多酚工艺研究

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武夷学院学报 2015年第3期34卷 39-42页

作者：张婷婷卓清菊邹美玲谢三都武夷学院茶与食品学院福建武夷山354300 福建师范大学闽南科技学院福建泉州362332

本实验以干制石榴皮为原材料,采用超声波辅助酒石酸亚铁法制备多酚,通过单因素实验和正交实验确定最佳提取工艺条件为:乙醇浓度30%(v/v),提取时间25min,超声功率120W,料液比(g/m L)1:40,在此工艺条件下,多酚的提取率为20.21%。

关键词：干制石榴皮多酚超声波提取

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