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spin Hall effect in prototype Rashba ferroelectrics GeTe and snTe

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npj Computational Materials 2020年第1期6卷 1607-1613页

作者： Haihang Wang Priya Gopal silvia Picozzi stefano Curtarolo Marco Buongiorno Nardelli jagoda sławińska Department of Physics University of North TexasDentonTX 76203USA Consiglio Nazionale delle Ricerche Istituto SPINUOS L’AquilaSede di lavoro CNR-SPIN c/o Univ.G.D’Annunzio66100 ChietiItaly Center for Autonomous Materials Design Duke UniversityDurhamNC 27708USA Materials science Electrical EngineeringPhysics and ChemistryDuke UniversityDurhamNC 27708USA

Ferroelectric Rashba semiconductors(FERsCs)have recently emerged as a promising class of spintronics materials.The peculiar coupling between spin and polar degrees of freedom responsible for several exceptional properties,including ferroelectric switching of Rashba spin texture,suggests that the electron’s spin could be controlled by using only electric fields.In this regard,recent experimental studies revealing charge-to-spin interconversion phenomena in two prototypical FERsCs,GeTe and snTe,appear extremely relevant.Here,by employing density functional theory calculations,we investigate spin Hall effect(sHE)in these materials and show that it can be large either in ferroelectric or paraelectric structure.We further explore the compatibility between doping required for the practical realization of sHE in semiconductors and polar distortions which determine Rashba-related phenomena in FERsCs,but which could be suppressed by free charge carriers.

关键词： structure Rashba ferroelectric

Milestones and current achievements in development of multifunctional bioscaffolds for medical application

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Bioactive Materials 2021年第8期6卷 2412-2438页

作者： jagoda Litowczenko Marta J.Wózniak-Budych Katarzyna staszak Karolina Wieszczycka stefan Jurga Bartosz Tylkowski NanoBioMedical Centre Adam Mickiewicz University in PoznanWszechnicy Piastowskiej 3PoznanPoland Institute of Technology and Chemical Engineering Poznan University of Technologyul.Berdychowo 4PoznanPoland Eurecat Centre Tecnològic de CatalunyaChemical Technologies UnitMarcel⋅líDomingo s/nTarragona43007Spain

Tissue engineering(TE)is a rapidly growing interdisciplinary field,which aims to restore or improve lost tissue function.Despite that TE was introduced more than 20 years ago,innovative and more sophisticated trends and technologies point to new challenges and development.Current challenges involve the demand for multifunctional bioscaffolds which can stimulate tissue regrowth by biochemical curves,biomimetic patterns,active agents and proper cell types.For those purposes especially promising are carefully chosen primary cells or stem cells due to its high proliferative and differentiation potential.This review summarized a variety of recently reported advanced bioscaffolds which present new functions by combining polymers,nanomaterials,bioactive agents and cells depending on its desired application.In particular necessity of study biomaterial-cell interactions with in vitro cell culture models,and studies using animals with in vivo systems were discuss to permit the analysis of full material biocompatibility.Although these bioscaffolds have shown a significant therapeutic effect in nervous,cardiovascular and muscle,tissue engineering,there are still many remaining unsolved challenges for scaffolds improvement.

关键词： Innovative materials Biomimetric materials scaffolds Regenerative medicine

Absorption and emission modulation in a Mos2–GaN（0001） heterostructure by interface phonon–exciton coupling

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Photonics Research 2019年第12期7卷 1511-1520页

作者： YUBA POUDEL jagoda sLawiNska PRIYA GOPAL sAIRAMAN sEETHARAMAN ZACHARIAH HENNIGHAUsEN sWAsTIK KAR FRANCIs D'sOUZA MARCO BUONGIORNO NARDELLI ARUP NEOGI Department of Physics University of North TexasDentonTexas 76203USA Department of Chemistry University of North TexasDentonTexas 76203USA Department of Physics Northeastern UniversityBostonMassachusetts 02115USA

semiconductor heterostructures based on layered two-dimensional transition metal dichalcogenides(TMDs)interfaced to gallium nitride(Ga N)are excellent material systems to realize broadband light absorbers and emitters due to their close proximity in the lattice constants.The surface properties of a polar semiconductor such as Ga N are dominated by interface phonons,and thus the optical properties of the vertical heterostructure are influenced by the coupling of these carriers with phonons.The activation of different Raman modes in the heterostructure caused by the coupling between interfacial phonons and optically generated carriers in a monolayer Mos_2–Ga N(0001)heterostructure is observed.Different excitonic states in Mos_2 are close to the interband energy state of intraband defect state of Ga N.Density functional theory(DFT)calculations are performed to determine the band alignment of the interface and revealed a type-I heterostructure.The close proximity of the energy levels and the excitonic states in the semiconductors and the coupling of the electronic states with phonons result in the modification of carrier relaxation rates.Modulation of the excitonic absorption states in Mos_2 is measured by transient optical pump-probe spectroscopy and the change in emission properties of both semiconductors is measured by steady-state photoluminescence(PL)emission spectroscopy.There is significant red-shift of the C excitonic band and faster dephasing of carriers in Mos_2.However,optical excitation at energy higher than the bandgap of both semiconductors slows down the dephasing of carriers and energy exchange at the interface.Enhanced and blue-shifted PL emission is observed in Mos_2.Ga N band-edge emission is reduced in intensity at room temperature due to increased phonon-induced scattering of carriers in the Ga N layer.Our results demonstrate the relevance of interface coupling between the semiconductors for the development of optical and electronic applications.

关键词： spectroscopy. coupling interface

An experimental and theoretical investigation of a small,high aspect-ratio,free-piston,two-stroke engine

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Propulsion and Power Research 2020年第4期9卷 326-343页

作者： Chiluwata E.Lungu Mael Disseau Daniel C.stubbs Jechiel jagoda David E.scarborough General Electric Company GreenvilleSouth Carolina29615USA Georgia Institute of Technology AtlantaGeorgia30332USA Truett McConnel University ClevelandGeorgia30528USA Auburn University AuburnAlabama36849USA

This paper presents a design for a novel,palm sized,high-aspect-ratio engine.To simplify fabrication and keep the device unobtrusive,a design incorporating a two-cycle engine having a flat,rectangular piston with spring return was selected.An experimental engine based on this concept producing a significant amount of useful work was developed.Although results were encouraging,this geometry raised many issues to be investigated and resolved,including the effects of piston sealing,scavenging,heat losses,and combustion efficiency.Due to the complex interplay between these effects,experimental investigation was time consuming and simple models were found to be inadequate.Therefore,a more complex theoretical model accounting for these effects was developed and used to evaluate the sensitivity of engine performance to each of these parameters.The predictions of this model were used to develop recommendations for improving the experimentally developed engine.

关键词： Micro-combustion Power generation Free-piston engine Internal combustion engine Palm power

Influence of Temperature and Current on Hydrogen Evolution during Cathodic Polarisation of AI-Ga Alloys

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材料科学与工程（中英文A版） 2011年第4X期1卷 552-555页

作者： jagoda Radogevic Lea Kukoc-Modun Ratko Mimica Igor Janjatovic FEsB Department of Mechanical Technology Split Croatia KTF Department of Analytical Chemistry Split Croatia NEXE Group d.d. Nasice Croatia

The yield of hydogen formed during cathodic polarization of five Al-Ga binary alloys in neutral salt solutions was measured volumetrically as a function of current density, temperature and gallium content in the alloy. Al-Ga alloys had been prepared from super pure (99.99%) Al base. The yield of hydrogen was established to be about 2 at all current densities and at low temperatures, while with increasing temperature it approached the value of 4. With the increase of gallium content in the alloy, the yield of hydrogen decreases.

关键词：二元合金电流密度阴极极化 AI 温度析氢 GA 极化过程

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妊娠期癫痫发作的应急处理

国外医学（妇产科学分册） 1992年第3期19卷 155-157页

作者： jagoda A Riggio s 崔书章柴艳芬

妊娠期癫痫应用抗癫痫药物有某些致畸作用,癫痫发作未控制对胎儿的危险较之使用抗癫痫药物更大。癫痫持续状态的处理需用静脉苯酰安定、苯妥英钠或苯巴比妥。胎儿的良好预后取决于对发作的迅速控制。对子痫的处理尚有争议。目前,处理子... 详细信息

妊娠期癫痫应用抗癫痫药物有某些致畸作用,癫痫发作未控制对胎儿的危险较之使用抗癫痫药物更大。癫痫持续状态的处理需用静脉苯酰安定、苯妥英钠或苯巴比妥。胎儿的良好预后取决于对发作的迅速控制。对子痫的处理尚有争议。目前,处理子痫发作可采用处理癫痫持续状态的方法。

关键词：妊娠癫痫

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欧洲来津留学生跨文化适应研究

欧洲来津留学生跨文化适应研究

作者：颖茉（jagoda sIDOR）天津大学

学位级别：硕士

随着中国的快速发展,中国逐渐成为越来越多的欧洲学生的首要留学选择。中欧之间存在着巨大的文化差异,因而欧洲来津留学生在跨文化适应过程中不可避免遇到各种困难。本文主要针对欧洲来津留学生,对南开大学、天津大学、天津外国语大学... 详细信息

随着中国的快速发展,中国逐渐成为越来越多的欧洲学生的首要留学选择。中欧之间存在着巨大的文化差异,因而欧洲来津留学生在跨文化适应过程中不可避免遇到各种困难。本文主要针对欧洲来津留学生,对南开大学、天津大学、天津外国语大学、天津师范大学、天津工业大学、天津科技大学及天津财经大学87名来自于16个欧洲国家的留学生从跨文化适应的方面进行了问卷调查,对其中16名留学生进行了访谈。笔者使用数据分析软件sPss 25.0统计了自己制作的网络调查问卷的数据,随后分析了统计数据及其背后的意义,进一步了解了欧洲来津留学生跨文化适应的总体状况。绪论部分主要阐述了本论文的研究背景、研究目的和其背后的研究意义,并对所调查到有关系或者有帮助作用的论文进行阐述;在第二章主要介绍了对该论文的设计方向和所设定的目标对象进行的研究;第三章通过对问卷与访谈数据的整理,对西方留学生的跨文化适应进行了分析和研究;最后一章则对总体的研究结果进行概括和总结,并对从欧洲来津欧洲留学生在跨文化适应方向遇到的问题尽可能的给出了相应的解决方案。研究发现,在讨论和分析欧洲来天津留学生所面临的关于跨文化适应的问题是,他们的心理适应性是最强的,最弱的是语言适应性。具体而言,欧洲来津留学生的心理适应性>生活适应性>人际适应性>学习适应性>语言适应性。通过进一步的分析,本文发现:性别、在津时间长短、汉语水平、学费来源、学习类型是影响欧洲来津留学生的跨文化适应的主要因素。其中性别对人际适应与学习适应拥有显著影响,在津时间长短对语言适应性拥有显著影响,汉语水平对生活适应性及语言适应性拥有显著影响,学费来源对语言适应性拥有显著影响,并且学习类型对学习适应性拥有显著影响。除此之外,通过调查与进一步的访谈的结果可知文化差异、思乡病、缺少真心的中国朋友、网络不便、语言障碍是来津欧洲留学生面对的主要问题之一。通过与7名拥有中国津外生活经验的学生的访谈可知天津的特点为:较适合上学、天津人说话较好理解、接近中国首都北京、天津的美食好适应等。

关键词：欧洲来津留学生跨文化适应文化休克

大白鼠淋巴结移植——功能结构和细胞学的变化以及影响其再生的因素

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中国修复重建外科杂志 1992年第1期6卷 44-47页

作者：刘宁飞 jagoda Maldik Waldermar L.Olszewski 张涤生上海第二医科大学第九人民医院整复外科 Dep. surgical Res. Transplant. Medical Res. Center Polish Academy of Sciences Warsaw.

本实验研究了大白鼠肠系膜淋巴结移植后的结构、功能以及细胞学的变化。同时观察了白细胞间介素2(Il-2)和棒状杆菌(Corynebacterium Parum C.P.)对移植后淋巴结再生的影响。结果表明淋巴结移植后体积逐渐缩小,细胞成份不断减少,丧失了... 详细信息

本实验研究了大白鼠肠系膜淋巴结移植后的结构、功能以及细胞学的变化。同时观察了白细胞间介素2(Il-2)和棒状杆菌(Corynebacterium Parum C.P.)对移植后淋巴结再生的影响。结果表明淋巴结移植后体积逐渐缩小,细胞成份不断减少,丧失了正常的组织结构和功能。而淋巴结移植后其输入淋巴管再生的失败是导致其退化的主要原因。IL-2可能具有调节淋巴结内再循环淋巴细胞的作用而有利于维持移植后淋巴结的完整性。

关键词：淋巴结移植输入淋巴管

有一种新的基因组织结构的传染性支气管炎病毒(IBV)

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有一种新的基因组织结构的传染性支气管炎病毒(IBV)