bluuebunny/crossref_metadata_2025 huggingface dataset:
Comportamentos de voz e silêncio em uma perspectiva multidimensional: caracterizando o fenômeno entre trabalhadores brasileiros
Authors: Andrade Rayana Santedicola , Bastos Antônio Virgílio Bittencourt
Published: December 2020

Neste estudo objetivamos descrever e explorar comportamentos de voz e silêncio (V&S) em uma perspectiva multidimensional com vistas a contribuir para seu entendimento e reduzir a lacuna empírica existente nesta perspectiva. Utilizando método descritivo, quantitativo e transversal foi possível, de forma pioneira no campo internacional, descrevermos os comportamentos de V&S em uma amostra de 476 trabalhadores inseridos em organizações diversas. As Escalas de Voz e de Silêncio nas Organizações permitiram identificarmos estes comportamentos, assim como suas relações com fatores demográficos e ocupacionais críticos para seu entendimento. Os resultados reforçaram a multidimensionalidade e simultaneidade de V&S, apontando a tendência dos trabalhadores a agruparem-se em padrões (clusters) e indicando diferenças significativas no modo de expressão ou retenção de informações ou sugestões relacionadas ao trabalho em virtude de características demográficas e ocupacionais. Realizamos considerações acerca do caráter descritivo, e recomendamos pesquisas com delineamentos mais complexos a partir do avanço do campo.
Wpływ dźwięku maskującego na zrozumiałość niepożądanych dźwięków mowy w biurach typu open space – wyniki badań własnych
Authors: Mikulski Witold
Published: December 2020

W artykule przedstawiono wyniki badania obliczeniowego, wpływu zastosowania dźwięków maskujących na zrozumiałość mowy na stanowiskach pracy w typowym pomieszczeniu biurowym open space. Jako dźwięki maskujące uwzględniono dźwięki o czterech charakterach widm częstotliwości i o poziomach dźwięku A z zakresu 25-45 dB. Kryteria oceny akustycznej biurowych pomieszczeń open space przyjęto wg PN-EN ISO 3382-3:2012 i PN-B-02151-4:2015 (właściwości akustyczne pomieszczenia) oraz PN-B-02151-2:2018 (poziom tła akustycznego, w tym i dźwięku maskującego). Wykazano, że jest możliwe uzyskanie odpowiednich warunków środowiska pracy (w tym własności akustycznych pomieszczenia) przy poziomie dźwięku A dźwięku maskującego z zakresu 31-37 dB (w zależności od rozpatrywanego jednego z czterech typów charakteru widma dźwięku maskującego).
Simplified analyses of stress induced
anisotropy in remolded soft clay under
undrained conditions
Authors: Lin P. , Li Z.-x. , Garg A. , Yadav J.S.
Published: December 2020

Purpose: The soil’s anisotropy induced by stress (i.e. stress induced anisotropy) has an
important effect on the behavior of soil. This paper focuses on analyzing the anisotropy of
remolded Shantou soft clay under compression stress path.
Design/methodology/approach: Experiments were executed by using three axle
experimental instruments. The data obtained from the plain strain tests were analyzed and
the relationship between stress and strain was calculated by using the modified Duncan-
Chang and Lade-Duncan models. The models were modified under the condition of plain
strain and cohesion.
Findings: It was concluded that in complex stress path conditions, the conventional triaxial
tests may not fully reflect the actual stress of soil and its response in the Duncan-Chang and
Lade-Duncan models.
Research limitations/implications: The formulation of Mohr-Coulomb failure criterion
in the plasticity framework is quite diffcult. As a result, dilatancy cannot be described. The
properties of soil in unload or drained conditions remain to be part of further investigated.
Practical implications: Based upon the two stiffness parameters, the modified Duncan-
Chang model has captured the soil behaviour in a very conformable way and is recommened
for practical modeling. These constitutive models of soil are widely used in the numerical
analyses of soil structure such as embankments.
Originality/value: Duncan-Chang and Lade-Duncan models widely used in engineering
practices are modes based on conventional triaxial cases. Both models have have some
inherent limitations to represent the stress-strain characteristics of soils, such as shear-induced
dilatancy and stress path dependency and required corrections. In this investigation, the tests
are carried out in undrained conditions. It is related to the properties of soil in load conditions.
CONHECIMENTO NECESSÁRIO PARA FUGIR DO JUROS NEGATIVOS
Authors: Godinho Bertoncello Alexandre , Natan dos Anjos Felipe
Published: December 2020

Interest rates in Brazil have historically been high and for this reason the form of investment in the country has always been unsophisticated, large investors made fixed income, as the CDI and small investors applied in savings. In the present national scenario 2019/2020, it is possible to observe that Brazil will have macroeconomic conditions very different from those experienced in recent years, with a decrease in the aggregate government supply, a reduction in the increase in public and household debt, and a great reduction in interest rates. interest. In the coming years it will be important to diversify investments, after all the phenomenon of negative interest in other markets will be a national reality. To obtain answers, quantitative and exploratoryapproaches were used, and later the comparative method, to corroborate the correlation between capital accumulation and the macroeconomic scenario. As a result, it was possible to ascertain that there is no correlation between the base interest rate and indebtedness, but that there is a relationship between the return on traditional investments and interest, at the same time, educational levels have a direct relationship with indebtedness and thus we conclude that there is a new monetary reality, but we still do not have a new reality for investors and borrowers in Brazil
SUSTENTABILIDADE E TECNOLOGIA NAS OBRAS DE RENZO PIANO
Authors: Aurélio Gimenes de Oliveira Marco , Pichioni Pellozo Thaís , Aparecida Teixeira Ferreira da Costa Korina
Published: December 2020

In this article, an analysis and comparison of two expressive works by the Italian architect Renzo Piano is proposed, following a logical line of the current High Technology for an EcoTechnology. This objective is achieved through bibliographic studies that allow the necessary theoretical detailing, in addition to the analysis of projects in focus: TheNational Center for Science and Technology (NEMO), in Amsterdam, and the California Academy of Natural Sciences, in the United States, from an architectural point of view. Similarities can be seen between the projects, mainly chronologically punctuated developments from the oldest to the most recent. The study shows, in this way, that it is possible to understand an improvement of the architect in view of the architectural currents, making his intentions and cares more clearly projected over time clearer.The theory of architectural study is Tectonics in line with the search for reduced impacts on the environment
FATORES DE RISCO ASSOCIADOS AO AGRAVAMENTO DE SEPSE EM PACIENTES EM UNIDADE DE TERAPIA INTENSIVA DE UM HOSPITAL DE ENSINO
Authors: Breda Nascimento Maioline Bianca , Lopes Pinto Robson , de Faria Forato Kawany , Vinicius Pimenta Rodrigues Marcus , Calciolari Rossi Renata , Cristina Negri Santos Elaine , Giuffrida Rogério
Published: December 2020

The objective of the study is to outline the profile of patients admitted to an Adult Intensive Care Unit of a Teaching Hospital inthe Interior of São Paulo with sepsis and to evaluate the risk factors and clinical characteristics associated with the evolution to sepsis considering as outcomes of worsening septic shock and death. Medical records of patients in the Adult ICU were analyzed from July 2017 to July 2019, and a case-control study was carried out on these patients, considering 3 outcomes: sepsis, septic shock and death. The study included 154 patients admitted to the ICU during the study period. Of these, 105 patients with sepsis were included. The risk factors found were hyperthermia, anemia, renal failure, hyperkalaemia and the need for mechanical ventilation. Further reflection on sepsis is necessary, which is still one of the main causes of death in the ICU, causing high socioeconomic impact due to the high hospital cost and limited therapies.
Macao Gaming Concession System: Present and Future Direction
Authors: Siu Lam Carlos , Lopes Dulce
Published: December 2020

Macao gaming concession is about to expire in June 2022, and such issues as the number of concessions and contract period have attracted much attention. This article introduces the evolution of Macao gaming system with emphasis on its concession duration, legal limit on the number of concessions, asset disposal and tax rate. As a result of its gaming liberalization, Macao has developed into the world’s casino capital. The gaming situation in Macao and in the gaming jurisdictions nearby is different from what it was twenty years ago. Although the current law requires a new public tender for awarding concessions, the increased number of gaming jurisdictions to target Macao would entail adjustment in its public policies to keep its gaming industry competitive. Additionally, the evolution of the relevant public policies and their interactions with touristic, infrastructural, environmental and urban planning policies would likely lead to some changes in the core of the current Macao gaming legislation. The authors indicated that the emergence of subconcessions and satellite casinos, the fractioning of spaces and utilities by different entities regarding asset reversion to the government, and the relationship between concessionaires and junket operators are some major issues, which require an improved legal framework designed to react expeditiously and effectively to the fast-moving industry for a sustained and consistent upward regulatory trajectory. Following this, revising and improving the current concession model would be crucial, even though it implies changes to the core of the current Macao gaming legislation.
Supramolecular Chemistry and DNA Interaction Studies of Ferrocenyl Ureas and Thioureas
Authors: Kausar Samia , Ali Altaf Ataf , Hamayun Muhammad , Badshah Amin , Razzaq Abdul
Published: December 2020

In this chapter, we have discussed the characteristics and bioapplicabilities of different ferrocene derivatives, for example, amides, amines, sulfonamide, and polymers, focusing mainly on urea and thiourea derivatives due to their autonomous and widespread spectroscopic action and bioactivities. Supramolecular chemistry of ferrocenyl ureas and thioureas is described owing to exploring their mode of interactions within and among the molecules and the role of these supramolecular structures in enhancing the DNA intercalation. DNA interaction studies of these ferrocenyl-based ureas and thioureas are explored with approaches like electrochemical study, viscosity measurements, molecular docking, electronic spectroscopy, dynamic light scattering (DLS), and radical scavenging activity. Attachment of ferrocene moiety to ureas an thiouereas closer to DNA is very promising strategy which most possibly boosts the probability of DNA damage and cell apoptosis which is responsible for enormous biological activities.
Improved Direct Torque Control Based on Neural Network of the Double-Star Induction Machine Using Deferent Multilevel Inverter
Authors: Haithem Lazreg Mohamed , Bentaallah Abderrahim
Published: December 2020

In this chapter, we will compare the performance of a multilevel direct torque control (DTC) control for the double-star induction machine (DSIM) based on artificial neural network (ANN). The application of DTC control brings a very interesting solution to the problems of robustness and dynamics. However, this control has some disadvantages such as variable switching frequency, size, and complexity of the switching tables and the strong ripple torque. A solution to this problem is to increase the output voltage level of the inverter and associate the DTC control with modern control techniques such as artificial neural networks. Theoretical elements and simulation results are presented and discussed. As results, the flux and torque ripple of the five-level DTC-ANN control significantly reduces compared to the flux and torque ripple of the three-level DTC-ANN control. By viewing the simulation results using MATLAB/Simulink for both controls, the results obtained showed a very satisfactory behavior of this machine.
Carbon Nanotubes: Applications to Energy Storage Devices
Authors: Amin Ruhul , Ramesh Kumar Petla , Belharouak Ilias
Published: December 2020

Carbon nanotubes (CNTs) are an extraordinary discovery in the area of science and technology. Engineering them properly holds the promise of opening new avenues for future development of many other materials for diverse applications. Carbon nanotubes have open structure and enriched chirality, which enable improvements the properties and performances of other materials when CNTs are incorporated in them. Energy storage systems have been using carbon nanotubes either as an additive to improve electronic conductivity of cathode materials or as an active anode component depending upon structural and morphological specifications. Furthermore, they have also been used directly as the electrode material in supercapacitors and fuel cells. Therefore, CNTs demand a huge importance due to their underlying properties and prospective applications in the energy storage research fields. There are different kinds of carbon nanotubes which have been successfully used in batteries, supercapacitors, fuel cells and other energy storage systems. This chapter focuses on the role of CNTs in the different energy storage and conversion systems and impact of their structure and morphology on the electrochemical performances and storage mechanisms.
Religious Consciousness
Authors: Bhattacharya Katyayanidas ,   Society for Indian Philosophy and Religion
Published: December 2020

The basis of religion lies in the nature of man as a thinking self-conscious being. As a thinking being, I can make my individual self and the world, which is opposed to it, the object of my thought and have the capacity to transcend the opposition and rise to a higher unity in which both these -- the self and not-self are comprehended as elements. It is by thought that we transcend the limits of finitude and share in a life which is universal and infinite, in which religion may be said to consist. Thought or self-consciousness is a universal principle in us and being universal, enables us to rise above our particularity and participate in the universal and absolute life or God.
The Many Harms of SETs in Higher Education
Authors: Mun Cecilea ,   Romanian Academy - Iasi Branch
Published: December 2020

In this paper, I call attention to the problem of continuing to rely on SETs for hiring, reappointment, promotion, and award decisions in higher education, including the problem of continuing to permit the use of SETs despite the clear and explicit acknowledgement of their shortcomings. I argue that to do so manifests a failure to acknowledge the weight of the actual and potential harms of SETs. I then provide an outline of such harms in order to clearly convey not only the weight but also the extent of such harms, especially on marginalized job candidates and non-privileged students. I also report the results of a recent survey I conducted in order to document any actual or possible harms that were committed against professional educators by the use of SETs in hiring, reappointment, or promotion decisions. I conclude by arguing that, given all of the foregoing, the use of SETs should be abolished for hiring, reappointment, promotion, and award decisions in higher education.
Some psychological impacts on judging in criminal cases within the Supreme Court of Cassation of the Republic of Serbia
Authors: Avramović Dragutin
Published: December 2020

Following hypothesis of Andrew Watson, American professor of Psychiatry and Law, the author analyses certain psychological impacts on behavior of judges and examines the relationship between their idiosyncrasies and their judicial decisions. The survey encompasses the judges of Criminal Department of the Supreme Court of Cassation of the Republic of Serbia and, also, for comparative reasons, the judges of Criminal Department of the First Basic Court in Belgrade. Considering the main issues there is no great discrepancy between answers given by the judges of the Supreme Court and those of the Basic Court. Most responses of the Serbian judges deviate from Watson's conclusions, namely: they do not admit that they feel frustrated due to heavy caseloads, the significant majority of judges are reluctant to acknowledge their prejudices and influence of biases on their ruling, the significant majority of judges are not burdened with the idea of possible misuse of their discretion, they nearly unanimously deny that public opinion and media pressure affect their rulings, etc. Generally, the judges in Serbia are not willing to admit that they cannot always overcome their own subjectivities.
Convention 108: Present importance and implementation
Authors: Murtezić Arben
Published: December 2020

The purpose of this paper is to highlight the significance of the Convention for the Protection of Individuals with regard to Automatic Processing of Personal Data (Convention 108) in the overall system of personal data protection, especially from the perspective of non-EU countries that are members of the Council of Europe. This is attempted primarily through the evaluation of correlation between the Convention 108 and ECHR and GDPR in its segment that regulates relationship between the EU and third countries. The interest for the issue of personal data protection has been increasing among legal and ICT professionals, academics, government officials and even a general public over the years. This has been particularly intensified by adopting General Data Protection Regulation (GDPR). However, the adoption of the GDPR did not diminish importance of the Convention 108. On the contrary, it seems that the 'adequacy' principle regarding the third countries proclaimed by the GDPR, stresses its importance. The paper begins with the brief overview of the Convention 108 principles and the modernization that is brought by Protocol of 2018, which coincides with the entry into force of much-mentioned GDPR. It continues with analysis of the relationship between the GDPR and Convention 108, with focus on elements decisively influencing the assessment of the adequacy of the level of protection. Even though there is no sign of equivalence between the right to privacy and personal data protection these matters inevitably intersect in practice. Therefore, the final section of the text summarizes the cases of the European Court of Human Rights invoking Convention 108, with the aim to demonstrate how it is interpreted by the highest judicial instance in Europe.
Bankruptcy over the deceased's estate (inheritance) as a form of personal bankruptcy
Authors: Čolović Vladimir
Published: December 2020

Bankruptcy over the deceased's estate is one of the forms of personal bankruptcy. This institute contains a number of specifics that according to certain elements separate it from the personal bankruptcy. However, most of the rules of personal bankruptcy must apply to this form of bankruptcy, given the status of the deceased, his property and heirs. In order to be able to define the rules of personal bankruptcy in case of bankruptcy over the deceased's estate, we must start from the basic rules of inheritance law concerning the acceptance of inheritance and debts of inheritance. Also, important elements must be defined from the standpoint of the rules of the personal bankruptcy, namely the status of the deceased before death, the source of creditors' claims, the status of inheritance, as well as the possibility of conducting a special personal bankruptcy against the heir. When we talk about the status of the deceased before death, we mean that he was engaged in some economic activity as an entrepreneur or he was a member of a company that has unlimited liability where he is liable with his property for the debts of that company. Finally, the deceased could be only a consumer. The author tries to answer whether the status of the deceased before death is important for conducting bankruptcy proceedings over the deceased's estate. The paper also pays attention to the German legislation, as well as to the US legislation in this area. German Insolvency Act regulates personal bankruptcy in detail, as well as bankruptcy over the deceased's estate. In addition, the author refers to some important provisions of the Act on inheritance of Serbia, as well as of the Act on consumer's bankruptcy of Croatia.
Using indicators to assess sustainable tourism development: The case of protected natural areas of Vojvodina (Northern Serbia)
Authors: Trišić Igor
Published: December 2020

The selected protected areas represent significant examples for analyzing the tourism offer whose results largely interpret the state and the perspective of sustainable development. Considering these indicators at the level of tourism development in the analyzed protected areas can contribute to the development of planning models and strategies of sustainable development. On the other hand, with proper implementation, the values of all elements of the environment that is significant for the users of the areas are directly improved which directly enables the sustainable development of a destination. Research data have been collected through a questionnaire, processed and displayed by the Chi-Square and Friedman Tests, which identified average values and obvious differences in displayed values of sustainable tourism development indicators in selected protected areas.
Poniendo el "marmor Cluniensis" en el mapa de "Hispania". El uso de la principal roca ornamental de color de procedencia ibérica en el interior peninsular en época romana
Authors: Virginia García-Entero
Published: December 2020

La calidad litológica y la riqueza y variedad cromática de las calizas y conglomerado de Espejón –marmor Cluniensis– estuvieron entre las razones que hicieron de estas rocas una de las más apreciadas entre los marmora hispanos explotados desde época augustea y ampliamente utilizadas en el interior peninsular durante todo el período romano. En el presente trabajo se analizan exhaustivamente las evidencias conocidas del uso del marmor Cluniensis en Hispania, contextualizando su empleo con el del resto de marmora presentes en los programa ornamentales públicos y privados de yacimientos hispanos, lo que nos permite valorar la integración de las calizas y conglomerado de Espejón en el mercado del marmor y proponer áreas de confluencia y competencia con materiales lapídeos de ámbito mediterráneo e ibérico.
Inteligencia artificial responsable y ciencia cívica
Authors: Terrones Rodríguez Antonio Luis
Published: December 2020

Tras los procesos de investigación e innovación en el campo de la inteligencia artificial (IA) subyacen relaciones políticas que pueden ser sometidas a una reflexión ética. La ciencia cívica pone en valor la comunicación como una herramienta para fortalecer los vínculos democráticos entre los entornos científicos y la ciudadanía. En este sentido, el propósito de este trabajo gira en torno a la formulación del concepto de inteligencia artificial responsable (IAR) impulsado desde los laboratorios abiertos como un espacio deliberativo para hacer posible el cultivo de habilidades cívicas y democráticas en el contexto tecnológico. Proporcionando de ese modo una orientación pragmática y fronética de los sistemas artificiales hacia los Objetivos de Desarrollo Sostenible. Este trabajo es el resultado de una investigación bibliográfica.
Economicidade da Técnica e Tecnicidade na Economia Neoclássica: uma Interlocução com Heidegger
Authors: Nascimento Antônio José
Published: December 2020

O presente artigo sustenta que é plausível se fazer derivar da analítica da técnica em Heidegger uma economicidade que radica no nexo metafísico-produtivista do caráter ontológico de ‘des-ocultação’ (Un-verborgenheit) da figura da técnica moderna, a qual, por sua vez, atua tanto na gênese da ciência moderna quanto na constituição mesma da economics como dictum racionalizador do incondicionado da vontade de poder da técnica. Não por acaso, a economics leva a cabo a conversão do homem em demandante compulsivo, em subjectum autodeterminado de uma vontade de querer propiciadora da exploração abusiva, razão por que se argumenta aqui em defesa da ideia de uma tecnicidade outra no interior do arcabouço teórico da vertente neoclássica.
Liberdade e democracia em conflito
Authors: Falabretti Ericson Sávio
Published: December 2020

A experiência democrática moderna indica que o nosso sistema político mantém uma relação de sobredeterminação com a liberdade. Toda forma de sistema político determina o alcance e o sentido da nossa liberdade, ao mesmo tempo em que a experiência concreta de liberdade modifica o sistema político. Sustentamos neste trabalho que a liberdade individual elevada ao princípio máximo de realização existencial e à consagração ideal de vida política é, ao mesmo tempo, o registro jurídico-político de que realmente vivemos em uma democracia, sem, contudo, deixar de se apresentar como força desestruturante do próprio regime democrático.
Utopismo e antiutopismo, em Bloch e Jonas
Authors: Valverde Antonio
Published: December 2020

Aos quarenta anos de O Princípio Responsabilidade, de Hans Jonas, o ensaio1 procede à sondagem exploratória e à análise da tensão ético-política acerca das concepções de utopia e de antiutopia, dispostas e posicionadas pelas filosofias blochiana e jonasiana. Se para Bloch o que tem movido — e, por certo, seguirá movendo — a humanidade recebe sua identidade da docta spes (a esperança compreendida), sob a forma utopia concreta, fundada na ontologia do "ainda-não consciente"; para Jonas, ao contrário, é necessário suplantar a mentalidade utópica, sobremaneira a tecnológica, derivada e executora do projeto baconiano, de modo a facilitar a consolidação da ética da responsabilidade destinada à civilização tecnológica. Se uma posição ético-política finda por interrogar a outra, intenciona-se a explicitação crítica de ambas argumentações, que poderá fornecer alguns elementos de compreensão do problema. A hipótese subjacente aponta para a parte mais vulnerável de O Princípio Responsabilidade, os capítulos V e VI, em que ocorrem a crítica jonasiana à utopia de pressupostos derivados da filosofia marxista, sintetizados e atualizados em O Princípio Esperança, de Ernst Bloch.
Teoria crítica, sujeitos políticos e a situação brasileira: entrevista com Vladimir Safatle
Authors: De Campos Ribeiro Felipe Figueiredo , Coelho Bruna , Anton Daphne , Mello Pisani Marília , Azeredo Fernanda
Published: December 2020

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Resenha: A dignidade da luta política: incursões pela filosofia de Michel Foucault. Caxias do Sul: EDUCS, 2020.
Authors: Galantin Daniel Verginelli
Published: December 2020

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Nonholonomic mapping theory and geometric formulation for rotation of a rigid body with one fixed point
Authors: Wang Yong  , Guo Yong-Xin  , Lü Qun-Song  , Liu Chang  ,   (1)北京理工大学应用力学系，北京  100081; (2)广东医学院基础学院，东莞  523808; (3)广东医学院实验管理处，东莞  523808; (4)辽宁大学物理学院，沈阳  110036
Published: December 2020

The method of nonholonomic mapping is adopted to construct a Riemann-Cartan space embedded in a known Riemann space. As a special case, Weitzenbock space is embedded in an Euclidean pace. By means of the nonholonomic mapping and d’Alembert-Lagrange principle a geodesic in a Riemann space is mapped to an autoparallel in a Riemann-Cartan space. The mapping theory is applied to the problem of rotation of a rigid body with a fixed point. It is proved that Euler equations for the rigid body are equations of geodesic in the Riemann configuration space described by Euler angles, whereas the equations in the pseudo-coordinate space corresponding to angular velocities of the rigid body are equations of autoparallel in the Riemann-Cartan space with constant torsion.
Time dependence of entropy flux and entropy production for a stochastic system with double singularities driven by non-Gaussian noise
Authors: Guo Pei-Rong  , Xu Wei  , Liu Di  ,   西北工业大学应用数学系，西安  710129
Published: December 2020

A stochastic system with double singularities driven by non-Gaussian noise is investigated. The Fokker-Plank equation of the system is obtained through the path-integral approach and the method of transformation. Based on the definition of Shannon’s information entropy, the time dependence of entropy flux and entropy production of the system is calculated both in the absence and in the presence of non-equilibrium constraint. The influences of the system dissipative parameter, the system singularity strength parameter, the noise correlation time and the noise deviation parameter on entropy flux and entropy production are discussed.
Effects of cross correlated noises on the mean first-passage time of optical bistable system
Authors: Wang Bing  , Yan Shao-Ping  , Wu Xiu-Qing  ,   安徽理工大学理学院，淮南  232001
Published: December 2020

The effects of multiplicative colored noise and additive white noise on the mean first-passage time （MFPT） T+（xs1→xs2） and T-（xs2→xs1） of an optical bistable system are investigated. The approximate Fokker-Planck equation is obtained based on the Novikov theorem and the Fox approach. The expression of MFPT is obtained in the steepest-descent approximation. Numerical results show that （1） the multiplicative noise intensity Q and additive noise intensity D play the same roles in T+（xs1→xs2） but different roles in T-（xs1→xs2）;（2）T+（xs1→xs2）increases with the increase of the self-correlation time τ but decreases with the increase of the correlation intensity λ；（3）T-（xs2→xs1）decreases with τ increasing， but increases with λ increasing.
A hyperchaos system with only one nonlinear term
Authors: Zhou Ping  , Wei Li-Jia  , Cheng Xue-Feng  ,   (1)重庆邮电大学网络化控制与智能仪器仪表教育部重点实验室，重庆  400065；重庆邮电大学应用物理研究所，重庆  400065; (2)重庆邮电大学应用物理研究所，重庆  400065
Published: December 2020

A novel four-dimensiond hyperchaos system with only one nonlinear term is reported. The Lyapunov exponents spectrum, periodic orbit, quasi- periodic orbit, and the chaos and hyperchaos attractor of this system are obtained. A circuit is designed to realize this system by electronic workbench. A synchronization method for the new hyperchaotic systems is established and the mathematical proof of the method is provided. The nonlinear terms in the response system are not dropped. Theoretical analysis and simulation results show that the method is effective.
Border collision bifurcation and chaotic control of discrete feedback transmission control protocol-random early detection system
Authors: Yang Tan  , Jin Yue-Hui  , Cheng Shi-Duan  ,   北京邮电大学网络与交换技术国家重点实验室，北京  100876
Published: December 2020

Various types of border collision bifurcations occurring in a discrete feedback transmission control protocol-random early detection （TCP-RED） system are analyzed based on normal form method. As the system parameters change, the system experiences the border collision and a sudden jump from a periodic attractor to a chaotic attractor leading to the intense vibration of the system and serious degradation of its performance. According to the linear stability condition of fixed point, a method of chaotic control is presented. With this method, the system can be stabilized to the fixed point by perturbing the state variable in the neighborhood of the fixed point. This method can significantly improve the performance and the resource utilization of TCP-RED system, and simulation results show that it is effective.
Short message spreading in complex networks and longevity of short message
Authors: Li Ming-Jie  , Wu Ye  , Liu Wei-Qing  , Xiao Jing-Hua  ,   北京邮电大学理学院,北京  100876
Published: December 2020

In order to find factors which influences on short message spreading, we compare short message propagation on three networks: scale-free, small-world and true-life short messages networks. The topology of short message network and the behaviors of mobile phone users play important roles in determining the behavior of a short message spreading. The impact of the scale-free network on the spread of short messages is twofold: messages spread more quickly than on small-world or true-life short messages networks, but longevity of short message is less than the other networks. Some behaviors of mobile phone users obviously influence the process of short message spreading. Meanwhile, we found that the longevity of short message relate to network diameter.
Structure and potential energy function of the ground state of BiH(D,T)
Authors: Wang Qing-Mei  , Ren Ting-Qi  , Zhu Ji-Liang  ,   曲阜师范大学物理工程学院,曲阜  273165
Published: December 2020

In this paper,the structure and dissociation energy of the ground state of BiH （D,T） are investigated by quantum mechanical ab initio method in the level QCISD/ LanL2DZ methods. Based on the theory of atomic and molecular statics, the reasonable dissociation limit for the ground state （X3Σ-）　of BiH　（D,T） is derived. The potential energy curve and relevant optical constants of this state are obtained by least square fitting to the Murrell-Sorbie function. All calculation results are in good agreement with the experimental data.
Structure and analytic potential energy function for the ground state of SiF2 molecule
Authors: Zhao Jun  , Cheng Xin-Lu  , Yang Xiang-Dong  , Zhu Zheng-He  ,   (1)长江大学物理科学与技术学院,荆州  434023; (2)四川大学原子与分子物理研究所,成都  610065
Published: December 2020

The density function （B3P86） method has been used to optimize the possible ground-state structure of SiF2 molecule. The results show that the ground state of SiF2 molecule has C2v symmetry and its electronic ground state is X1A1. The equilibrium parameters of the structure are RSi—F=0.1061　nm and De=13.8 eV. On the base of atomic and molecular reaction statics, the reasonable dissociation limit for the ground state of SiF2 molecule is determined. Then the analytic potential energy function of SiF2 molecule is derived by many-body expansion theory. The potential curves describe correctly the configurations and the dissociation energy for the SiF2 molecule.
Theoretical prediction of the shape of two-dimensional adatom islands on crystal surface
Authors: Yin Cong  , Xie Yi-Qun  , Gong Xiu-Fang  , Zhuang Jun  , Ning Xi-Jing  ,   (1)复旦大学光科学与工程系,上海  200433; (2)复旦大学现代物理研究所,上海  200433
Published: December 2020

By introducing a concept of condensing potential, a theoretical method is established to predict the geometric structure of two-dimensional （2D） adatom islands on crystal surface. Calculations based on semi-empirical potentials （surface-embedded-atom method potential and O. Johnson potential） show that on Cu（111） and Ag（111） surfaces the homoepitaxial 2D islands take on hexagons, while on Pt（111） surface the islands are truncated triangles, and on Cu（100） and Ag（100） surfaces the islands have square shape. These theoretical predictions are in good accordance with the experimental observations . Since calculation of the condensing potentials is independent of the size of islands, this theoretical model could be widely used to predict the shapes of 2D islands on various surfaces.
Analytic potential energy function of PH2(X2 B1) radical using coupled-cluster method in combination with the correlation-consistent basis sets
Authors: Zhang Dong-Ling  , Tang Qing-Bin  , Zhang Jin-Ping  , Shi De-Heng  , Yu Ben-Hai  ,   信阳师范学院物理电子工程学院,信阳  464000
Published: December 2020

The equilibrium geometries for the ground state of PH2 radical are calculated by using the coupled_cluster single_double model with a perturbative triple excitations （CCSD（T）） method in combination with the series of correlation-consistent basis sets of Dunning and co-workers. It can be found that the cc-pV5Z basis set is the most suitable basis set by comparing the calculations with the experiment. The results obtained at CCSD（T）/ cc-pV5Z level of theory are 0.14185 nm for the equilibrium bond length RP—H, 91.8624° for the bond angle αHPH, 3.483 eV for the dissociation energy De and 2399.9781, 1128.4213 and 2407.8374 cm-1 for the normal of vibrational frequencies（ν（a1）, ν2（a1） and ν3（b2）, respectively. The potential energy function of PH2 （C2v, X2B1） is derived using many-body expansion theory. The characters of structure and the change of energy are reflected correctly by the function.
Theoretical calculation of the differential cross section for He-BH collision system
Authors: Wang Rong-Kai  , Shen Guang-Xian  , Yang Xiang-Dong  ,   (1)贵州师范大学化学与材料科学学院,贵阳  550001；贵州师范大学原子与分子物理研究所,贵阳  550001; (2)贵州师范大学物理与电子科学学院,贵阳  550001；四川大学原子与分子物理研究所,成都  610065；贵州师范大学原子与分子物理研究所,贵阳  550001; (3)四川大学原子与分子物理研究所,成都  610065
Published: December 2020

For the first time, the elastic, inelastic and total differential cross sections for collision between He atom and the ground state of BH molecule have been calculated by using accepted exact close-coupling approximation method. The calculation is performed at the incident energies from 25 to 150 meV. Further, the change tendency and characteristics of the differential cross sections have been discussed. The calculated results show that the total differential cross section is the general rule and characteristics of collision between an atom and a diatomic molecule, the phenomenon of the scattering oscillation at large angles is more evident along with increase of the incident energy for low-lying rotational excitation state-to-state differential cross sections in He-BH collision system.
An experimental investigation of the cross-section ratios in the collisions of partially stripped Cq+，Oq+(q=1—4)on helium atom at the strong-interaction region
Authors: Zhou Chun-Lin  , Shao Jian-Xiong  , Chen Xi-Meng  , Gao Zhi-Min  , Wang Jun  , Sun Guang-Zhi  , Xi Fa-Yuan  , Chen Yi-Feng  , Chen Lin  , Ding Bao-Wei  , Wang Xing-An  , Lou Feng-Jun  , Xu Jun-Kui  , Qiu Xi-Yu  , Wang Fan  , Lü Y  ,   兰州大学核科学与技术学院,兰州  730000
Published: December 2020

We measured the cross-section ratios of helium induced by Cq+ and Oq+ （q=1—4） produced by the 2×1.7 MV tandem accelerator of Lanzhou University in the energy range from 20 to 500 keV. We obtained the two-dimensional spectrum by employing coincidence method combined with the MPA-3 data acquisition system. Thus, we obtained the ratios of direct ionization, projectile capture electrons and projectile loss electrons to the total cross-section which are denoted by of Rdirect， Rcapture and Rloss in this paper. A qualitative explanation of the competitive relation of the three reaction-channels and the emperical laws of the three reaction channels are separately presented.
Re-analysis of the experiment data of vertical migration of radon and its daughters under ideal condition
Authors: Hong Jin-Quan  , Le Ren-Chang  , He Zhi-Jie  , Ye Quan-Yi  , Chen Jian-Di  , Zhou Bao-Yong  ,   福建师范大学物理与光电信息科技学院，福州  350007
Published: December 2020

Helium-radon clusters will migrate upwards provided the clusters are made up of one radon atom and more than 8 helium atoms. With less than 8 the atoms, the specific gravity of the helium-radon clusters will be heavier than their buoyancy and the clusters will migrate downwards. Hence the average number of atoms will be greater 1a upwards-migrating clusters. The mathematical calculation has been done to obtain the average atomicity of clusters from experimental radon data. The results show that the number of α particles provided by uranium ore is insufficient, if not considering the diffusion of radon, because one radon atom needs to combine with 7.5 helium atoms. But if the diffusion of radon is taken into account, there will have enough number of α particles because one radon atom needs to combine with just 4.26—5.57 helium atoms. Therefore, the diffusion of radon cannot be ignored when we apply the migration mechanism of helium-radon clusters to explain the vertical migration experiment data of radon and its daughters.
The magnetism of M13-doped cagelike structure of gold clusters (M = Fe, Ti)：density functional calculations
Authors: Chen Xuan  , Peng Xia  , Deng Kai-Ming  , Xiao Chuan-Yun  , Hu Feng-Lan  , Tan Wei-Shi  ,   南京理工大学应用物理系,南京  210094
Published: December 2020

The geometric and magnetic properties of M13 and M13-doped Au20 （M = Fe, Ti） clusters have been studied using the generalized gradient approximation based on the density functional theory. The optimized geometries of the clusters are close to the Ih structure within 0.006—0.05 nm tolerance. The lowest-energy spin states of the Fe13 and Fe13-doped Au20 clusters are 44 μB and 38 μB, respectively, while there is week ferromagnetic interaction between the Fe and Au atoms for the Fe13-doped Au20 cluster. On the other hand, the lowest energy spin states of the Ti13 and Ti13-doped Au20 clusters are 6 μB and 4 μB, respectively. The magnetic ordering is in a week ferromagnetic arrangement between the 12 surface Ti atoms and Au atoms, while in a week antiferromagnetic arrangement between the 12 surface Ti atoms and the core Ti atom. Comparing with the bare Fe13 and Ti13 clusters, the magnetic moments of Fe13 and Ti13 in Fe13-doped Au20 and Ti13-doped Au20 clusters are reduced by 6.81 μB and 2.88 μB, respectively.
Phase singularities of speckle field produced by the scattering from Gaussian correlation random surfaces
Authors: Liu Man  , Cheng Chuan-Fu  , Song Hong-Sheng  , Teng Shu-Yun  , Liu Gui-Yuan  ,   (1)山东师范大学物理与电子科学学院,济南  250014; (2)山东师范大学物理与电子科学学院,济南  250014；山东建筑大学理学院,济南  250101; (3)山东师范大学物理与电子科学学院,济南  250014；山东轻工业学院数理学院,济南  250353
Published: December 2020

The two-dimensional speckle field and the phase produced by the Gaussian correlation random surfaces on the Fraunhofer plane were simulated. It was found that the zero-contour of the real and imaginary parts can be in the tangent and superposition situations besides the traditional intersection situation. The tangential points and the superposition-lines can also form phase singularities, around which the phase distribution shows the characteristics of discontinuity and symmetry and differs from the spiral distribution around the traditional singular points formed by the zero crossings of the real and imaginary parts. With the propagation of the optical wave, the relative positions of the zero-contour of the real and imaginary parts change from tangent to superposition, and then to intersection on the different observation plane with the simultaneously changes of the the phase singularities.
High quality digital holographic wave-front reconstruction system
Authors: Li Jun-Chang  , Zhang Ya-Ping  , Xu Wei  ,   (1)昆明理工大学工程力学系，昆明  650093; (2)昆明理工大学物理系，昆明  650093
Published: December 2020

The system of digital holographic wave-front reconstruction is studied based on Abbe imaging principle. The results show that the high-frequency angular spectral component of object light can arrive at charge-coupled device（CCD） detector through using imaging system to transform the object light field. To evaluate the quality of reconstructed object light field, the calculation formula to reconstruct wave-front at arbitrary position after the optical system on the CCD is derived, and pulse response of wave-front reconstruction system is researched when the object light arrives at CCD through paraxial optical system. Theoretical and experimental researches show that the object light field can be reconstructed with high quality when the CCD plane is close to the image surface.
An improved fast algorithm for chirp transforms and its applications
Authors: Shi Peng  , Liu Qiang  , Cao Guo-Wei  , Li Yong-Ping  ,   (1)中国科学技术大学物理系，合肥  230026; (2)中国科学技术大学中国科学院量子信息重点实验室，合肥  230026
Published: December 2020

A fast algorithm for chirp Z-transforms is improved form chirp Z-transform, which is developed by using two fast Fourier transforms and an analytical Gaussian kernel. Its computational complexity is less than a fast convolution algorithm. However, there are some problems when the algorithm is implemented, such as the discarding of the data, the smallness of the response domain, the bigness of the computational complexity and so on. To avoid the problems mentioned above, we make a change on the implementing of the algorithm in this paper. Then we compare the numerical results of some chirp systems with the analytical ones. The accuracy of Fourier transforms of Gaussian function is higher than the 10-15 order for most cases, and the accuracy of Fourier transforms of rectangle function is about the 10-3 order, which is essentially limited by the accuracy of the fast Fourier transform. Finially this algorithm is used to calculate some typical systems of scalar diffraction and fractional-order Fourier transforms, and the results are in good agreement with other published results in the literatures.
Exact calculations of the energy spectra and the dynamical properties of a two-level system
Authors: Ren Xue-Zao  , Jiang Dao-Lai  , Cong Hong-Lu  , Liao Xu  ,   西南科技大学理学院，绵阳  621010
Published: December 2020

Applying the method of coherent-state orthogonalization expansion，the energy spectra and the dynamical properties of the Jaynes-Cummings model with non-rotating wave approximation are calculated exactly. By comparison with the approximate analytical solutions, it is found that the approximate analytical solutions agree with our numerical exact solutions well both in weak coupling regime and in strong coupling regime, but not so well in intermediate strength coupling regime.
Measurement and analysis of the characteristics of transverse modes of a sealed-off He-N2-CO2 laser
Authors: Wang Wen-Peng  , Xu Zhou-Su  , Xu Jun  , Chen Gang  ,   浙江工业大学应用物理系，杭州  310023
Published: December 2020

The characteristics of the transverse modes of a sealed-off He-N2-CO2 laser are measured on-line by using a laser beam analyzer. The influence of the transverse modes on discharge current is observed. It is shown that this laser tube can easily operate on lower order modes under optimum discharge current，but hardly operate on the TEM00 mode. Under the condition of improved symmetry of laser tube and increasing the speed of cooling water, the laser can operate on the TEM00 mode. The variety of laser modes is analyzed through the kinetic process theoretically, which is helpful to the control and improvement of laser mode for high power lasers.
Femtosecond laser ablation of silicon wafers in air and water
Authors: Wang Rui  , Yang Jian-Jun  , Liang Chun-Yong  , Wang Hong-Shui  , Han Wei  , Yang Yang  ,   (1)河北工业大学材料科学与工程学院，天津  300130; (2)南开大学现代光学研究所，光电信息科学技术教育部重点实验室，天津  300071
Published: December 2020

In this paper, we investigate laser ablation of silicon wafers in air and water through using Ti:sapphire femtosecond laser with central wavelength of 800 nm and pulse duration of 50 fs—24 ps at a repetition rate of 1 kHz. Unique concentric rings are observed on the sample surfaces during the laser ablation in ambient air. Formation mechanisms of the inner and outer ablative structures are attributed to the thermal melting and Coulomb explosion, respectively. The influence of laser parameters, such as the laser energy, the number of pulses and the pulse duration on the radius of the ablation ring is observed experimentally. It is found that drilling a blind hole with large aspect ratio usually requires multiple laser shots with relatively small pulse energy. In the water surroundings, femtosecond laser ablation results in porous microstructure formation in the irradiated area. However, laser pulses with picosecond duration lead to large material removal by evidently nonthermal processes. Theoretical analysis suggests that this phenomenon could be explained by the photo-mechanical stress and bubble cavitation, which are strengthened with increasing pulse duration. The critical pulse width separating the two different ablation processes in the water ambience is determined experimentally for the first time.