bluuebunny/crossref_metadata_2025 huggingface dataset:
Review of scientific research in ISO 9001 and ISO 14001: a bibliometric analysis
Authors:   Escuela Superior de Ingeniería y Tecnología (ESIT). Universidad Internacional de la Rioja (UNIR). Avda. de la Paz, 137. 26006 La Rioja (España) – natalia.orviz@unir.net, Orviz Martínez Natalia , Cuervo Carabel Tatiana ,   Escuela Superior de Ingeniería y Tecnología (ESIT). Universidad Internacional de la Rioja (UNIR). Avda. de la Paz, 137. 26006 La Rioja (España) – tatiana.cuervo@unir.net, Arce García Sergio ,   Escuela Superior de Ingeniería y Tecnología (ESIT). Universidad Internacional de la Rioja (UNIR). Avda. de la Paz, 137. 26006 La Rioja (España) – sergio.arce@unir.net
Published: December 2020

The aim of this paper is to determine a bibliometric study through the Web of Science (WoS) database, to know the state of the art of the ISO 9001 and ISO 14001 standards. This is done through a search for publications, from the year of standard’s publication until the year 2018. The main contribution of this work is to take a view from the research lines taken to date in this emerging knowledge field, analyzing the countries, institutions, the most productive authors, as well as the main scientific journals that publish on the subject. Three main lines of research for ISO 9001 were related to its compression and benefits, its integration with other management systems, and its relationship to the financial performance of companies have been identified. On the other hand, around ISO 14001 there were four lines of research associated with its relationship with financial performance and sustainable development, its integration with other management systems, and its association with other environmental management systems, such as EMAS. From the review carried out, the need to deepen issues that have not yet received adequate attention from researchers, such as the rapid expansion of certifications in emerging countries imposed directly and indirectly by developed countries, is highlighted, the difficulties in the adoption process of norms and the perception of the implementation and certification of the ISO management systems by different interest groups, inter alia.
A Systematic Literature Review of the Potential Therapeutic Effects of Ayahuasca Tea Prepared From the Use of Banisteriopsis Caapi and Psychotria Viridis
Authors: Trevisani Adriane Cordeiro , Trevisani João Pedro Cordeiro , Haverroth Moacir , Melo Ailton Da Cruz , Santos Isabela Carvalho dos , Barbosa Lidiane Nunes , Gonçalves Daniela Dib
Published: December 2020

Ayahuasca is a drink of indigenous origin made as a decoction obtained from medicinal plants found mainly in Acre, state of Brazil, which are the leaves of Psychtoria viridis, popularly known as “chacrona” in Brazil, and the stem of Banisteriopsis caapi, commonly known as mariri or jagube. The decoction is used in religious practices for the therapy of diseases that affect the human being, such as psychological disorders, neurological, parasitic and bacterial infections. Considering the existing bioactive compounds and the therapeutic potential of ayahuasca, this study aims to carry out a literature review of scientific articles (PubMed, Scielo and LILACS) in order to gather knowledge within 30 years of study about the therapeutic potentials of ayahuasca. In the current literature, the studies focus on the area of neuropsychology, dealing with ayahuasca as a form of therapy for neurological and neuromotor disorders. In addition, antimicrobial, antiparasitic, immunomodulatory, and antioxidant actions have already been reported. However, new studies are still needed in these areas in order to evaluate the efficacy and safety of ayahuasca and its component plant species, in order to use it as an alternative therapy, especially in the population from which the traditional knowledge about this beverage came from.
Functional Continuum Questionnaire
Authors: Broderick Jill
Published: December 2020

Thirty years ago, the Functional Continuum Questionnaire (FCQ) was developed to measure functional outcomes using biofeedback in an occupational therapy context. Initially, the assessment was designed to identify dysfunction in various areas that influence occupational behavior (daily tasks) and performance, to identify goals for therapy. Over time, the FCQ was reformatted to produce a score that correlates as a discreet point on a continuum of function/dysfunction (functional continuum). This score may be used as a pre- and post-assessment to evaluate patients' perception of change in function as an outcome of biofeedback and occupational therapy. The FCQ is presented in this article along with the functional continuum. A brief discussion about the theoretical framework—the model of human occupation—is provided. The statements used in the FCQ describe components of occupational behavior from the model, providing a comprehensive set of factors influencing occupational performance. The FCQ was also designed to provide a perspective regarding the unique focus of occupational therapy interventions, which can be communicated through the use of this tool. The FCQ has been used in my private practice over the past 30 years. It is an easy-to-use self-assessment tool that provides measurable data to identify patients' specific challenges in occupational performance as well as their overall perception of their function.
Comparing Muscle Activity and Spine Shape in Various Sitting Styles
Authors: Peper Erik , Krüger Björn , Gokhale Esther , Harvey Richard
Published: December 2020

Lower back pain is experienced by approximately 70% of the world's population, contributing to the worldwide burden of disease. Americans experience lower back pain at an estimated economic cost of $560–$635 billion. One contributing factor for back pain is posture, and more particularly, lack of awareness of dysfunctional posture. For example, many people sit in a slouched or forward-bent position, exacerbated by poor ergonomics while sitting or extended use of handheld digital devices while standing, such as looking down at a smartphone for long periods of time. This report describes a stacksitting technique that is one of the components of the Gokhale Method® for healthy, relaxed sitting and increased awareness of posture. The stacksitting process is illustrated with a case study, where the shape of the spine and the muscle activity are analyzed in parallel during three sitting styles: slouching, arched, and stacksitting. The spine curvature was characterized by the Gokhale SpineTracker™ wearable, which consists of five sensor units attached along the subjects' spines that are used to plot the spinal curve on a digital device such as a smartphone, tablet, or computer. Surface electromyographic (SEMG) recordings were made from the right upper trapezius, left upper trapezius, right midback, and left midback with a second device (Myoscan Pro sensors recorded with Biograph Procomp Infinity) while participants were seated in three postures: a slouched (forward-bent) position, an upright arched position, and an upright stacksitting position as trained by a Gokhale Method teacher. The case observations showed no significant difference in trapezius SEMG activity during each of the three positions. There was a slight increase in SEMG activity of the midback during stacksitting (1.1 μV) as compared with when slouched (0.64 μV), and a significant increase in SEMG activity when sitting arched (4.9 μV). As expected, the spinal activity tracking device showed significant straightening of the lower spine during the stacksitting position as compared with the slouched and arched positions. The observations suggest that the stacksitting position can be taught to others in a way that allows the vertebrae to be parallel to each other with very low levels of corresponding muscle activity. In contrast, sitting in an arched or slouched position could increase asymmetrical pressure on the disks, contributing to vertebral wedging, which could also contribute to spinal disk bulging and eventual back injury. The observations suggest that proper coaching may foster a stacksitting position of the spine, which could foster a healthier posture than slouched or arched spinal positions.
Modificação de Opinião dos Auditores por Risco de Continuidade Operacional no Brasil
Authors: Ponte Darlan Moura , Dantas José Alves , Nunes Danielle Montenegro Salamone
Published: December 2020

O presente estudo teve por objetivo identificar o contexto em que os auditores independentes modificam a opinião de auditoria com base no risco de continuidade operacional, no que concerne à evolução temporal de casos, ao perfil das firmas de auditoria, aos segmentos econômicos das companhias auditadas e aos assuntos utilizados como justificativa para a tipificação do risco de continuidade operacional. Foram examinados 2.884 relatórios –de auditoria sobre as demonstrações financeiras anuais de 338 companhias não financeiras listadas na B3, no período de 2009 a 2017. Os exames revelaram 87 relatórios com opinião modificada associada ao risco de continuidade operacional e que: (i) há uma tendência de crescimento do número de relatórios com menção ao risco de continuidade operacional; (ii) entre as firmas de auditoria, a BDO auditoria é aquela com o maior número de emissões de relatórios de auditoria sobre continuidade operacional; (iii) fatores como a crise econômica parecem explicar a concentração dos eventos de modificação de opinião por risco de continuidade operacional em determinados setores da economia, com destaque para o setor de tecidos, vestuário e calçados; e (iv) dentre os assuntos que geraram a modificação de opinião sobre continuidade operacional pelo auditor ‘prejuízos e passivo a descoberto’ foi o que teve maior incidência, confirmando pesquisas anteriores sobre o tema e as próprias orientações da NBC TA 570. O estudo contribui para a expansão da literatura nacional sobre o risco de continuidade operacional, principalmente se for considerada a incipiência de trabalhos desenvolvidos a respeito do tema no Brasil e a discussão sobre o papel desempenhado pelos auditores a respeito.Auditoria; Relatório de Auditoria; Opinião Modificada; Continuidade Operacional.
Folha de rosto
Authors: Klein Luciana
Published: December 2020

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De effecten van de coronamaatregelen voor mensen met een beperking vanuit een juridisch oogpunt
Authors: Swaanenburg-van Roosmalen M.
Published: December 2020

De effecten van de coronamaatregelen voor mensen met een beperking vanuit een juridisch oogpunt

Coronamaatregelen zijn zeer divers (zowel publiek als privaat) en kunnen verschillend uitpakken voor mensen met een beperking, al naar gelang hun omstandigheden, zoals de plaats waar zij wonen, werken en onderwijs volgen. Hoe verschillend individuele situaties van mensen met een beperking ook kunnen zijn, bij alle maatregelen rond corona moeten juridische analyses de rechten van mensen met een beperking betrekken: niet alleen in het licht van de Grondwet en wetgeving met waarborgen ter zake, maar ook van mensenrechtenverdragen en dan vooral het VN-verdrag Handicap. Het VN-verdrag Handicap is in coronatijd onverminderd van kracht. Uit het verdrag volgt dat ook bij de totstandkoming van coronamaatregelen nauw overleg geboden is met mensen met een beperking en hun representatieve organisaties. Deze bijdrage geeft aan welke aspecten bij het beoordelen van verschillende concrete coronamaatregelen in het bijzonder van belang zijn, gezien het VN-verdrag Handicap.
Wanneer je leven bepaald wordt door de wet
Authors: Dijkstra E.
Published: December 2020

Wanneer je leven bepaald wordt door de wet

Voor veel mensen met een functiebeperking geldt dat zij op wettelijk geregelde voorzieningen moeten vertrouwen voor hun basale levensbehoeften. De aannames van de wetgever betreffende welke noden van deze groep tot de verantwoordelijkheid van de maatschappij behoren, bepalen dus de mate waarin zij in deze behoeften kunnen voorzien en hoe zij – en hun omgeving – hun leven kunnen inrichten. In dit artikel wordt onderbouwd waarom de huidige aannames van de wetgever een grote groep mensen met een functiebeperking in de steek laten. In de participatiemaatschappij staan deelname aan de reguliere arbeidsmarkt en vertrouwen op het eigen netwerk namelijk centraal. Dientengevolge schiet de huidige sociale zekerheid voor mensen die niet of niet gedeeltelijk kunnen werken en geen daadkrachtig netwerk te hebben, veelal tekort. Een begin van de oplossing van dit probleem, zo wordt voorgesteld, is het opnieuw waarderen van bijdragen buiten de reguliere arbeidsmarkt en het uitbreiden en bestendigen van de voorzieningen voor mensen met een functiebeperking.
Opvang in de Wmo? Alleen als je het echt niet zelf kan!
Authors: Klein Egelink E. , Veenman L. , Vermaat M.F.
Published: December 2020

Opvang in de Wmo? Alleen als je het echt niet zelf kan!

Burgers kunnen dak- of thuisloos raken. Velen lossen dat probleem voor kortere of langere termijn zelf op. Sommigen lukt dat niet. Zij kloppen bij de gemeente aan voor opvang. Dat kan op grond van de Wmo 2015. Maar niet iedereen wordt opgevangen en deel van hen die wel opvang krijgt, wordt na verloop van tijd weer uit de opvang gezet. Zonder huis, thuis of dak boven hun hoofd. Toch vinden gemeenten dat deze mensen ‘zelfredzaam’ zijn. In dit artikel gaan wij in op de vraag wat gemeenten op grond van de Wmo 2015 moet doen en hoe de rechtspraak luidt. Of gemeenten buiten de Wmo ook ingevolge internationale verdragen tot een vorm van opvang zijn verplicht, valt buiten het bestek van dit artikel.
Levenstestament en bewind in relatie tot het VN-verdrag Handicap
Authors: Ogier J.S.
Published: December 2020

Levenstestament en bewind in relatie tot het VN-verdrag Handicap

Beschermingsmaatregelen zijn van bijzonder belang voor mensen met een (verstandelijke) beperking die hun wil niet kunnen uiten. Daarmee is het VN-verdrag Handicap ook van toepassing op deze maatregelen. Met de opkomst van het notariële levenstestament kan men zich afvragen of deze nieuwe vorm van bescherming voldoet aan het Verdrag. Tegelijk werpt het de vraag op of huidige wettelijke beschermingsmaatregelen dat wel doen. In dit artikel onderzoek ik in hoeverre het levenstestament en beschermingsbewind in overeenstemming zijn met het Verdrag.
Art. 6:13 Awb in de fuik?
Authors: van der Veen G.A. (Gerrit)
Published: December 2020

Art. 6:13 Awb in de fuik?

Auteur gaat in dit redactioneel in op de discussie over het vereiste om voor beroep bij de bestuursrechter bezwaar aan te tekenen bij het bestuursorgaan, in milieuzaken.
‘Battenoord’ op losse schroeven: tijd voor prejudiciële vragen
Authors: Bröring H.E. (Herman) , Koers A.W. (Albert)
Published: December 2020

‘Battenoord’ op losse schroeven: tijd voor prejudiciële vragen. Is het Activiteitenbesluit wel rechtsgeldig?

Auteurs gaan naar aanleiding van het arrest van het HvJ EU (Vlarem II) in op de vraag of het Activiteitenbesluit geldig is ondanks dat er geen strategische milieubeoordeling is opgesteld.
De Europese grenzen aan winstuitkering door zorgaanbieders
Authors: Glas L.R. , van de Gronden J.W. , Veenbrink J.M.
Published: December 2020

De Europese grenzen aan winstuitkering door zorgaanbieders

Regulering van winstuitkering is een politiek discussiepunt. Het kan dan ook voorkomen dat regulering van winstuitkering tot een lappendeken aan wetgeving leidt. Dit artikel gaat na welke ruimte het Europees Verdrag voor de Rechten van de Mens (EVRM) en het Unierecht laten om politieke compromissen te sluiten op het gebied van winstuitkering door zorgaanbieders.
O gerenciamento de danos ambientais na sociedade de risco e a emergência de um direito ambiental transnacional privado
Authors: Dantas Bruno , Dos Santos Caio Victor Ribeiro
Published: December 2020

O dano ambiental é típico da sociedade de risco: invisível, global e de potencial catastrófico. Por apresentar variáveis bem mais complexas que o ilícito civil comum, exige um tratamento específico e diferenciado da ordem jurídica. Conduzido pelo método dedutivo, em pesquisa bibliográfica que se serviu de obras nacionais e estrangeiras, este artigo objetiva discorrer sobre a natureza do dano ambiental, buscando lançar luz sobre pontos essenciais e fornecer subsídios para seu correto tratamento pelo ordenamento jurídico. Após discorrer sobre a natureza do dano ambiental e a tensão de correntes que divergem quanto ao seu enfrentamento, o artigo demonstra a emergência de um direito ambiental transnacional, pautado na criação de obrigações ambientais pela via dos contratos, como uma nova luz no tratamento e prevenção da ocorrência de danos ambientais.
Supporting family as a form of family support
Authors: Niesyty Dominika
Published: December 2020

The aim of the article is to analyse the functioning of supporting families. They play an important role in the process of supporting the natural family experiencing difficulties in caring for and bringing up children. In their work with the family, they carry out tasks related to the care and education of children, running a household, shaping and fulfilling social roles. Supporting families are appointed and function on behalf of the commune pursuant to the Act of 9 June 2011 on supporting the family and the foster care system. The article presents legal aspects and figures on the performance of supporting families. The legal aspect includes the performance rules, the recruitment scheme, taking into account a number of requirements and the scope of tasks performed by supporting families. The statistical data presents an analysis of the trends of changes regarding the number of functioning families, the time spent by children in the care of supporting families and the number of supported families. Supporting families become each time more popular form of support for a natural family experiencing caring and upbringing difficulties. By embracing a family with support, members of the supporting family play the role of the authority of behaviour for parents and the role of a “positive adult” model for children. The supporting family is a model of parenting, an authority in fulfilling social roles, a guide for the change made and a teacher of everyday family life. By implementing the entrusted tasks resulting from the Act and the contract concluded with the head of the commune, the supporting family supervises the overall development of the family as a system and its individual members.
The potential of mentoring and befriending as a complementary form of support for a professional social service system
Authors: Chrostowska Bożena
Published: December 2020

Contemporary reality brings many adverse social phenomena, both for individuals and entire groups. The assistance provided by professional support systems are insufficient as in Poland as in the world. The important role of professionally organized volunteering in solving social problems is emphasized in the context of implementing tasks in the field of social services. Noteworthy proposal successfully implemented in United Kingdom are mentoring and befriending programs functioning there as a standard of assistance to people at risk of social exclusion. This form of volunteering is still little known in Poland and mentoring programs are not popular. It is difficult to find works in Polish on studies related to volunteering in the form of befriending and mentoring. Therefore, the article is to fill the gap in this regard. The article presents the assumptions, organization, forms of this type off support as well as its benefits and limitations basing mainly on the example of the solutions used in United Kingdom. Considering the growing demand in Poland for measures preventing social exclusion or supporting the process of (re)integration, the British examples as well as the existing conceptualisations and practices related to mentoring and befriending may be used as inspiration.
Bilder und visuelles Erinnern in und durch Medien. Gedanken zu einer Ethik der Anerkennung und Sichtbarkeit
Authors: Grittmann Elke
Published: December 2020

Dokumentarische Fotografien und Bewegtbilder - speziell historischer Aufnahmen - spielen in Erinnerungsdiskursen und Gedenken in und durch Medien eine besondere Rolle. Das gilt für das mediale Gedenken an den Holocaust ebenso wie an die friedliche Revolution 1989, an 9/11 oder an jüngere Ereignisse wie den Anschlag in Halle 2019. Visuelles Erinnern birgt spezifische ethische Herausforderungen im journalistischen Produktions- und Publikationskontext. Die kommunikationswissenschaftliche Erinnerungsforschung beobachtet ferner eine „Transnationalisierung“ und „Transkulturalisierung“ medialer Erinnerungsdiskurse und -praktiken. Angesichts dieser Transformationen wird sichtbar, dass sich die Funktionen von Bildern im medialen Erinnern mit den bisherigen Theorien kollektiver Erinnerung nicht mehr adäquat erfassen lassen und neue ethische Fragen aufwerfen.
Friedenslogik – ein heuristisches Projekt
Authors: Birckenbach Hanne-Margret , Jaberg Sabine
Published: December 2020

The logic of peace approach is a heuristic project. It can be developed in two ways. The first one begins with concept-related reflections. In this perspective, the discrimination between peace and security becomes part of peace itself. Furthermore, the logic of peace is characterized by abstract parameters like sociality, symmetry, and averseness to violence. The second way starts with the analysis of the contemporary peace discourse. It adds a conflict-orientated perspective and generates a set of five questions and answers - for instance with regard to the defined problem and its causes. Both ways lead to the same end, but each of them deserves more elaboration.
Betriebliche Integration von Geflüchteten: Handlungsperspektiven und soziales Innovationspotential
Authors: Gonser Monika
Published: December 2020

Der vorliegende Beitrag diskutiert den strategischen Fokus sowie die institutionellen Logiken, Strukturen und Maßnahmen der betrieblichen Integration von Geflüchteten und untersucht das soziale Innovationspotential dieses Bereichs nach Nicholls und Murdock (2012). Aufbauend auf empirischen Daten von 14 Unternehmen, die in den Jahren 2016 und 2017 Geflüchtete beschäftigten, sowie einer NRO, bietet die Studie einen Überblick über relevante Motivationen, Ansätze und Mittel betrieblicher Integration Geflüchteter in den untersuchten Fällen. Als zentrale Befunde sind günstige Vorbedingungen für soziale Innovationen bei a) neuen Formen der Kooperation zwischen Wirtschaft und Zivilgesellschaft und b) der Nutzung der Digitalisierung im Matching-Prozess zu nennen.
Time Frequency Analysis of Wavelet and Fourier Transform
Authors: Wirsing Karlton
Published: December 2020

Signal processing has long been dominated by the Fourier transform. However, there is an alternate transform that has gained popularity recently and that is the wavelet transform. The wavelet transform has a long history starting in 1910 when Alfred Haar created it as an alternative to the Fourier transform. In 1940 Norman Ricker created the first continuous wavelet and proposed the term wavelet. Work in the field has proceeded in fits and starts across many different disciplines, until the 1990’s when the discrete wavelet transform was developed by Ingrid Daubechies. While the Fourier transform creates a representation of the signal in the frequency domain, the wavelet transform creates a representation of the signal in both the time and frequency domain, thereby allowing efficient access of localized information about the signal.
Utilization of Starch in Food and Allied Industries in Africa: Challenges and Prospects
Authors: Olayemi Raji Akeem
Published: December 2020

The shortage of food supply has affected the food situation in most developing tropical countries, resulting into a high incidence of hunger and malnutrition. This has also affected the attainment of self sufficiency in starch production for food, pharmaceutical and industrial usage. The review critically appraised the challenges that food and allied industries are facing on the utilization of starch as their major raw material. Information on various conventional and non conventional starch sources were provided, starch forms, properties and recent advances in starch modification methods were discussed. Starch applications in food and allied industries were mentioned and various challenges facing common starch sources were stated. Possibly, utilization of unconventional lesser known crops as starch sources might broadening the present narrow commonly cultivated starch sources, while value addition and good agricultural practices might improve the productivity of conventional starch sources.
Navigating the Jargon of Molecular Testing in Non-Hodgkin Lymphoma
Authors: Hsi Eric D.
Published: December 2020

The many different subtypes of non-Hodgkin lymphoma can be distinguished by histopathology, immunophenotype, and underlying genetic abnormalities. Molecular testing is routinely used by pathologists for diagnosis and prognosis, and to aid in guiding therapy selection (targeted or nontargeted). The different tools and techniques used for molecular testing are based on abnormality type and tissue available.
Jahn-Teller effect in the Nb planar atomic sheet
Authors: Chen Lu-Zhuo  , Wang Xiao-Chun  , Wen Yu-Hua  , Zhu Zi-Zhong  ,   (1)厦门大学物理系，厦门大学理论物理与天体物理研究所，厦门 361005; (2)厦门大学物理系，厦门大学理论物理与天体物理研究所，厦门 361005；清华大学物理系，北京 100084
Published: December 2020

The structural stability and electronic structures of Nb planar atomic sheets are studied by employing first-principles plane wave pseudopotential method based on the density functional theory. The calculations for all the 2-dimensional lattice structures show that, as a result of Jahn-Teller effect, the high-symmetry square and hexagonal two-dimensional structures are metastable. The most stable structures are the low-symmetry oblique and centered rectangular structures, which are the distorted structures of the hexagonal 2-D structure due to Jahn-Teller effect. The 2-D rectangular structure of Nb atomic sheet can not be formed. The relative structural stabilities, the electronic energy bands and the density of states are discussed based on the ab initio calculations and the Jahn-Teller effect.
Synchrotron radiation photoemission studies on Fe/ZnO(0001) interface
Authors: Wang Guo-Dong  , Zhang Wang  , Zhang Wen-Hua  , Li Zong-Mu  , Xu Fa-Qiang  ,   中国科学技术大学国家同步辐射实验室，合肥 230029
Published: December 2020

The growth, interfacial reaction, and electronic structure of Fe on ZnO(0001) surface were studied using synchrotron radiation photoemission spectroscopy(SRPES). It was found that Fe layer grows in a way similar to the Stranski-Krastanov mode at room temperature. After～2? Fe deposited on the surface, the growth mode changes from the layer-by-layer to a mixed mode. At low coverage, about one monolayer of iron (ca. 1.5?) is oxidized by the outer oxygen atoms on ZnO(0001) surface. Analysis of the valence band and the Fe3p photoemission spectra indicated that below 2? coverage, Fe2+ species exists at the Fe/ZnO interface, followed by the formation of a metallic iron overlayer. A sharp Fermi edge appears at 5.1? coverage, indicating the formation of the bulk metallic Fe film. Furthermore, work-function of the sample decreases to a minimum of 4.5eV at 0.2? Fe, then goes to 4.9eV with the formation of a dipole layer at the interface.
Thermoelectric properties of nonstoichiometric Ag1－xPb18SbTe20 materials
Authors: Yan Yong-Gao  , Tang Xin-Feng  , Liu Hai-Jun  , Yin Ling-Ling  , Zhang Qing-Jie  ,   武汉理工大学材料复合新技术国家重点实验室，武汉 430070
Published: December 2020

Ag1-xPb18SbTe20(x＝0，0.25，0.5，0.75) samples were prepared by melt-quench-spark plasma sintering(SPS). As the Ag content decreased, a second phase Sb2Te3 occurred in samples and the carrier concentration increased to 5×1018cm-3 and then ceased to increase as Ag content decreased further. The carrier mobility decreased first, and then increased, as the Ag content decreased. As temperature increased, the carrier scattering mechanism shifted gradually from ionized impurity scattering to acoustic phonon scattering. As the Ag content decreased, the electric conductivity increased while the Seebeck coefficient decreased, and the thermal conductivity show an increasing trend.
Ultraviolet light emitting diode based on ZnO nanowires
Authors: Sun Hui  , Zhang Qi-Feng  , Wu Jin-Lei  ,   北京大学电子学系，北京 100871
Published: December 2020

The ultraviolet light emitting diode based on n-ZnO-nanowire/p-Si heterojunction was fabricated. Quasi-arrays of ZnO nanowires were grown on p-Si substrates using a simple low-temperature hydrothermal method that would be easily extended to mass production. As-grown ZnO nanowires showed good crystallinity, a preferable c axial orientation, and strong ultraviolet emission under optical excitation. Different kinds of cathodes were made to form the electrical contact. The I-V characteristics were diode-like. Under forward bias, the heterojunction diode emitted strong ultraviolet light at 387nm and weaker green light.
Spin waves in ferromagnetic/antiferrmagnetic bilayers under the stress field
Authors: Pan Jing  , Zhou Lan  , Tao Yong-Chun  , Hu Jing-Guo  ,   (1)南京师范大学物理科学与技术学院,南京 210097; (2)扬州大学物理科学与技术学院,扬州 225002
Published: December 2020

Using a method of free energy minimization, the spin wave, namely the ferromagnetic resonance, of ferromagnetic (FM)/antiferromagnetic (AFM) bilayers under the stress field has been investigated. The thin FM film is taken to be a single crystal with cubic or uniaxial magnetocrystalline anisotropy, while the thickness of AFM layer is semi-infinite and has single uniaxial magnetocrystalline anisotropy. Numerical calculation shows that stress field and the interface coupling strength will affect the behavior of FM resonance only under low magnetic field, and there are two branches of FMR modes at the critical field, which distinguishes between the weak and strong external field. The critical field depends on the direction of stress field. On the other hand, the change of the direction of the stress field can weakly affect magnetocrystalline anisotropies axis of FM layer.
Texture and magnetic properties of nanocomposite Pr2Fe14B/α-Fe melt-spun ribbons
Authors: Yang Bai  , Shen Bao-Gen  , Zhao Tong-Yun  , Sun Ji-Rong  ,   中国科学院物理研究所磁学国家重点实验室和北京凝聚态物理国家实验室，北京 100080
Published: December 2020

The effect of quenching rate on texture formation and magnetic properties of nanocomposite Pr2Fe14B/α-Fe melt-spun ribbons has been investigated. The c-axis texture of Pr2Fe14B phase perpendicular to the ribbon plane was found on free surface of melt-spun ribbons prepared by optimized melt-spun technique. The formation of c-axis texture mainly result from the crystallites of Pr2Fe14B growing up along the flow of heat, which is induced by the contact of melt alloy with the surface of Cu wheel. The texture of Pr2Fe14B phase does not penetrate through the thickness of melt-spun ribbons, and the incompletely textured structure does not bring about remanence enhancement. Anisotropic nanocomposite Pr2Fe14B/α-Fe ribbons were obtained by eliminating the unaligned part of the ribbons melt-spun at 16m/s through acid-etching and polishing the side of ribbons in contact with the roller surface during spinning. Both Br and iHc of the anisotropic ribbon measured along the direction perpendicular to the plane were improved obviously due to the c-axis alignment of Pr2Fe14B phase.
Morphology and absorption properties of Ag-SiO2 composite films
Authors: Zhao Ya-Li  , Gao Fan  , Wang Zhuang-Bing  , Ming Hai  , Xu Xiao-Liang  ,   (1)合肥工业大学理学院,合肥 230011; (2)中国科学技术大学物理系,合肥 230026; (3)中国科学院中国科学技术大学结构分析重点实验室,合肥 230026;中国科学技术大学物理系,合肥 230026
Published: December 2020

Ag/SiO2multilayers were prepared by RF magnetron sputtering. Via rapid thermal treatment, most of Ag nanoparticles move up to the surface. By changing the layer thickness of Ag and SiO2, Ag particles of different size, density and shape were obtained. The effect of factors such as size, density and shape of the Ag particle, on resonance absorption is also investigated. We change the annealing time according to the diffusion length. Ag particles with a facet parallel to substrate are obtained under adequate annealing time (17.5min). Since the atoms easily transport between particles within the facets, the radius of Ag particle decreases, and tends to a critical size. Correspondingly, the resonance absorption band becomes narrower and blueshift occurrs.
Electron cloud model of residential trip distribution
Authors: Wang Dian-Hai  , Jing Chao  , Yao Rong-Han  ,   吉林大学交通学院，长春 130022
Published: December 2020

The research showed that the probability density curve of residential trip distribution is very similar to the probability density curve of electron in ground state of hydrogen atom. The characteristics of residential trip distribution can be well described by the electron cloud model in quantum mechanics. In this paper a residential trip distribution model is built by simulating electron cloud according to the radial probability density function of electron in hydrogen atom. Then the model is validated by the sample survey data in Changchun city and San Francisco area. The application model is further put forward and its calibration method and process are given by using an example. The model can quantitatively describe the state of residential trip distribution in urban planning and urban traffic planning.
Lie symmetries and Hojman conserved quantities of one kind of differential equations of motion of nonholonomic systems
Authors: Hu Chu-Le  ,   呼伦贝尔学院物理系，海拉尔 021008
Published: December 2020

The Lie symmetries and Hojman conserved quantities of one kind of differential equations of motion of nonholonomic systems are studied. The determining equations and the restriction equations of Lie symmetries of the system are obtained. The condition under which a conserved quantity exists is established and the form of the conserved quantity is given. An example is given to illustrate the application of the result.
Entangled coherent states and their nonclassical effects
Authors: Xia Yun-Jie  , Gao De-Ying  ,   曲阜师范大学物理工程学院, 曲阜 273165
Published: December 2020

By introducing orthogonal basis，the entangled coherent states are converted to discrete ones. We calculate their entanglement by concurrence their nonclassical effects，such as squeezing and antibunching. We find that the entanglement always follows either one of squeezing or antibunching and the entanglement increases with the increase of one of the nonclassical effects.
Controlling chaos using half period delay-nonlinear feedback
Authors: Yu Hong-Jie  , Zheng Ning  ,   上海交通大学船建学院工程力学系，上海 200240
Published: December 2020

A method of chaos control using half period delayed-nonlinear feedback based on stability criterion is proposed in present paper. By a suitable separation of chaotic system, a special nonlinear function is obtained. Using the sum of nonlinear function about the chaotic output signal and its half period delayed output signal a continuous feedback input perturbation is constructed. Self-symmetric directly unstable periodic orbits can be stabilized by the method without using any external force. The method retains the advantages of performing the self-control of delay feedback control and overcomes its limitations. Beside, the validity of control is ensured due to the stability criterion. The control can be started at any moment, and it is convenient and flexible. The coupled coupling Duffing oscillator is taken as a numerical example. The results of numerical simulation show the validity of the method.
Study on measurement of concentration of uni-polarity particles
Authors: Sun Jian  , Bai Min-Dong  , Mao Cheng-Qi  , Bai Xi-Yao  ,   大连海事大学物理系，高气压强电场电离放电辽宁省重点实验室，大连 116026
Published: December 2020

At present, the methods using parallel plates and probes for detecting the plasma in the strong field have some limitations in measuring the charged particles produced by gas with high flow rate at atmospheric pressure. In this paper, a new detector with a spherical probe was proposed and was used to measure the charged particle concentration under the conditions of various gas velocities, electric field intensities and distances, as well as to study the spatial distribution of plasma. The result of the new method when was compared with that of DLY air ion detector indicates that the concentration detected by the former is near to the real value. Moreover, the detector with a spherical probe has advantages of as simple operation, small volume and convenience of local test, which contribute to the research of spatial distribution of plasma.
Structural stability of Se and Te nanowires
Authors: Yang Jiong  , Zhang Wen-Qing  ,   中国科学院上海硅酸盐研究所，高性能陶瓷和超微结构国家重点实验室,上海 200050
Published: December 2020

Structural stability for selenium and tellurium nanowires is studied by combining first-principles method and empirical approach. This is an interesting topic due to the fact that the Se and Te crystals are composed of triangular Se and Te chains and that the chain-chain interaction is relatively weak. Nanowires of small diameters (<30?) are studied by first-principles calculations. Meanwhile, an empirical method that considers only the interaction between chains is also proposed in order to study the nanowires of larger diameters. The nanowires with hexagonal cross section are more stable, though the hexagon is not always perfect in shape due to the limitation of chain number. This result agrees with the widely accepted stable structures of selenium and tellurium nanowires.
Numerical calculation of optical cross section and scattering matrix for soot aggregation particles
Authors: Huang Chao-Jun  , Liu Ya-Feng  , Wu Zhen-Sen  ,   (1)陕西理工学院物理系，汉中 723001; (2)西安电子科技大学理学院，西安 710071
Published: December 2020

Using the discrete-dipole approximation (DNA) method, after calculating optical characteristics of the single soot aggregation particle, we obtained the relationships of scattering cross section, absorption cross section and asymmetry parameter of soot aggregation particle with the changing incident angles, which provide an efficient approach for the research of radiative transportation of wave in soot particles. We propose the angular distribution of scattering matrix elements of soot particles at different incident angles, which provides a theoretical approach for the research of scattering characteristics, polarization characteristics, and the structural characteristics of the scatterer.
Electronic structures of CaWO4 crystal with F type color center
Authors: Shao Ze-Xu  , Zhang Qi-Ren  , Liu Ting-Yu  , Chen Jian-Yu  ,   上海理工大学 理学院，上海 200093
Published: December 2020

The electronic structure of CaWO4 crystal containing F-type color centers are studied within the framework of the fully relativistic self-consistent Direc-Slater theory, using a numerically discrete variational (DV-Xα) method. We come to a conclusion that F and F+ color centers exhibit donor energy level located in the forbidden band. The optical transition energies are 1.92eV and 2.42eV, respectively, which correspond to the 650nm and 515nm absorption bands. It is predicted that the 650nm and 515nm absorption bands originate from the F and F+ centers in CaWO4 crystals.
The influence of deposition temperature on the structure of microcrystalline silicon film
Authors: Chen Yong-Sheng  , Gao Xiao-Yong  , Yang Shi-E  , Lu Jing-Xiao  , Gu Jin-Hua  ,   郑州大学物理工程学院材料物理重点实验室，郑州 450052
Published: December 2020

Undoped hydrogenated silicon films have been prepared from a gas mixture of silane and hydrogen, at deposition temperature varying from 200—450℃ in an ultrahigh vacuum system using RFPECVD technique. Raman scattering, SEM and UV spectrophotometer are used to analyse the structure changes of microcrystalline silicon films throughout the deposition temperature range. Results show that at lower deposition temperature, the crystalline volume fraction of μc-Si:H films increased with the increasing of deposition temperature. Exceeding a certain temperature, the crystalline volume fraction decreased with further increasing of deposition temperature. This is attributed to a change in the dominant film growth process from surface-diffusion-limited at low deposition temperatures to flux-limited at higher deposition temperatures.
Rectifying characteristics of La1－xSrxMnO3/TiO2(x=0.2, 0.15, 0.04) pn heterojunctions
Authors: Li Tong  , Li Chi-Ping  , Zhang Ming  , Wang Bo  , Yan Hui  ,   北京工业大学材料科学与工程学院，北京 100022
Published: December 2020

La1-xSrxMnO3(LSMO)/TiO2 pn heterojunctions have been successfully synthesized by RF magnetron sputtering and they exhibit good rectifying properties. The diffusion potentials increase with increasing Sr concentration, which may be attributed to the increased carrier concentration. And the diffusion potential increases with decreasing measurement temperature, which may have resulted from modification of the interface electronic structure of La1-xSrxMnO3/TiO2 pn heterojunction with changing temperatures. It is worth noting that the metal-insulator (M-I) transition of LSMO can also be observed in pn heterojunctions and the increased sheet-resistance of pn heterojunctions at low temperature is related to the introduction of TiO2.
Energy band design for Si/SiGe quantum cascade laser
Authors: Lin Gui-Jiang  , Zhou Zhi-Wen  , Lai Hong-Kai  , Li Cheng  , Chen Song-Yan  , Yu Jin-Zhong  ,   (1)厦门大学物理系，厦门大学半导体光子学研究中心，厦门 361005; (2)厦门大学物理系，厦门大学半导体光子学研究中心，厦门 361005;中国科学院半导体研究所集成光电子国家重点实验室，北京 100083
Published: December 2020

This paper introduces in detail the working principle of Si/SiGe Quantum cascade laser(QCL). Appropriate parameters are used to calculate the hole subband structure of Si/Si1-xGex quantum well using a six-band k·p method.The dispersion relation and energy band for different layer thickness and compositions are investigated. Meanwhile,the energy separations between hole subbands in Si/Si1-xGex/Si quantum wells are also analyzed. Finally the calculated results are used for the Si/SiGe QCL design，which will be beneficial to the structure optimization of Si/SiGe QCL.
Investigation of concentration quenching effect in Tm3+-doped NaY(WO4)2 crystal
Authors: Han Lin  , Song Feng  , Zou Chang-Guang  , Su Jing  , Yan Li-Hua  , Tian Jian-Guo  , Zhang Guang-Yin  ,   南开大学物理科学学院光子学中心，天津 300071
Published: December 2020

Upconversion blue emissions of Tm3+ ions with different doping (0.5at.%, 3 at.%, 5 at.%) in NaY(WO4)2 crystals are investigated under 800nm diode laser excitation. The upconversion mechanism and the dependence of upconversion efficiency on ion concentration are analyzed with respect to the absorption spectra, fluorescence spectra, and parameters calculated by Judd-Ofelt theory. Four ion-ion interaction processes: 3H5+1G4→3H6+1D2, 3H5+3H5→3H6+3F3, 1G4+3H6→3F4+3F3,1G4+3H6→3F3+3F4, which influence the upconversion dominantly in Tm3+ heavy-doped system, are demonstrated theoretically and experimentally. The results indicate that cross-relaxation and cooperative upconversion are the dominant processes affecting the blue emission efficiency.
Study of Si-doped Sb2Te3 films for phase change memory
Authors: Zhang Zu-Fa  , Zhang Yin  , Feng Jie  , Cai Yan-Fei  , Lin Yin-Yin  , Cai Bing-Chu  , Tang Ting-Ao  , Chen Bomy  ,   (1)Silicon Storage Technology Inc.，Sunnyvale，CA94086，USA; (2)复旦大学专用集成电路和系统国家重点实验室，上海 200433; (3)上海交通大学“薄膜与微细技术”教育部重点实验室，“微米/纳米加工技术”国家级重点实验室，微纳科学技术研究院，上海 200030
Published: December 2020

Silicon doped Sb2Te3 films were deposited by three target (Si, Sb and Te) co-sputtering. For comparison, Ge2Sb2Te5 and Sb2Te3 films were also prepared. Memory cells (pore size=10 μm×10　μm) were fabricated by micro-fabrication to further study their storage performance. Results indicate that silicon doping increases the crystallization temperature. Meanwhile, silicon doping drastically enhances the resistivity ratio (high resistance state/low resistance state) to 106 by increasing both amorphous resistivity and crystal resistivity so as to further increasing the ON/OFF ratio of memory cell. Compared with Ge2Sb2Te5 film, 16at%Si-Sb2Te3 film has a higher crystalline resistivity and lower melting temperature, which are helpful to the reduction of RESET current. Memory cell with silicon doped Sb2Te3 film poccesses memory storage characteristics, and it can be reversibly switched between the high resistance state (RESET status) and the low resistance state (SET status). The SET status can be triggered by electrical pulse of 3V, 500ns and it comes back to the RESET status when 4V, 20ns pulse is applied, while Ge2Sb2Te5 cells, with the same structure can't be switched back to RESET state.
Investigation of pure ionization cross-sections of neon induced by C3+ collision
Authors: Lu Yan-Xia  , Chen Xi-Meng  , Ding Bao-Wei  , Fu Hong-Bin  , Cui Ying  , Shao Jian-Xiong  , Zhang Hong-Qiang  , Gao Zhi-Min  ,   兰州大学核科学与技术学院,兰州 730000
Published: December 2020

This paper presents the measurement results of absolute cross-sections of ion-atom collision in detail. The pure cross-sections of Nei+(i=1—4) induced by C3+ were investigated using coincidence technique. Comparing our experimental results with those of n-body classical trajectory Monte Carlo method, it is found that the changes of pure cross sections with increasing energy have the same trend in the two cases. The causes of discrepancies between them are discussed. The mechanism of multiple-ionization is analyzed. The highly charged recoil ions come mainly from the Auger effect. The electron-electron interaction comes in to effect as the incident energy increases. The cross-sections of all kinds of reactions can be measured in this way using the same equipment and projectile ions can be various within a wide range of energy.
First principles study of lowest energy structures and electronic properties of GenB(n=12—19) clusters
Authors: Jing Qun  , Zhang Jun  , Wang Qing-Lin  , Luo You-Hua  ,   (1)河南大学物理与电子学院，开封 475004; (2)河南大学物理与电子学院，开封 475004;华东理工大学理学院，上海 200237
Published: December 2020

The geometrical structures and electronic properties of GenB (n=12—19) clusters have been studied using first principles with generalized gradient approximation. The results show that GenB (n=12—19) clusters have large energy gap. The lowest energy structures of GenB (n=12—19) clusters have two different element, such as Ge9 and Ge10, cluster configuration. There are two different models capable of forming GenB clusters, which are the cluster with B atom concaved in Gen, and the cluster in which B substitutes Gen+1. 17 is the magic number of GenB (n=12—19) clusters.
Pulse shape control by Brillouin amplification of two Brillouin amplifiers
Authors: Yang Jun  , Lü Zhi-Wei  , He Wei-Ming  , Ruan Shuang-Chen  ,   (1)哈尔滨工业大学光电子技术研究所，哈尔滨 150001; (2)深圳大学电子科学与技术学院,深圳 518060; (3)深圳大学电子科学与技术学院,深圳 518060;哈尔滨工业大学光电子技术研究所，哈尔滨 150001
Published: December 2020

A novel scheme using a main Brillouin amplifier in combination with a reshaping Brillouin amplifier is suggested to control the stimulated Brillouin scattering pulse shape. In this scheme, the main amplifier coarsely controls the pulse shape by changing the delay time between the pump and the Stokes seed, and the reshaping amplifier fine_tunes the pulse shape, especially the rise edge of the pulse by adjusting the distance between the two cells. Dependence of the pulse shape on the distance between the two amplifiers is experimentally researched. The results show that the encounter time and the distance between two amplifiers are the most important parameters for controlling the pulse shape. This scheme is a simple and efficient way to precisely control the pulse shape.