bluuebunny/crossref_metadata_2025 huggingface dataset:
Análise dos discursos no Instagram sobre os papéis de gênero atribuídos aos brinquedos
Authors: Ribeiro Marislei Da Silveira , Silva Micael Machado da
Published: December 2020

Este artigo propõe analisar os discursos sobre os brinquedos na mídia social, Instagram. O intuito é discutir as estratégias dos discursos legitimados nas conversações que ocorrem sobre o que é para meninas e o que é para meninos a partir do caso de Theo Sholles Lima. Para tal, foi empregada como metodologia a Análise de Discurso de Linha Francesa que permite analisar o discurso em três níveis: sujeito, sentido e ideologia.
Los desórdenes informativos en un sistema de comunicación democrático
Authors: Aba-Catoira Ana
Published: December 2020

La desinformación constituye un asunto de relevancia pública que pone el foco de atención sobre la circulación de contenidos en redes digitales, su conexión con la defensa del sistema democrático y los efectos lesivos que produce en los derechos de la ciudadanía. No se trata de un problema nuevo, pero, ahora, se utilizan las redes para difundir bulos que responden a intereses de distinta naturaleza, pero siempre con el objetivo de impactar en la confianza en las instituciones y, en definitiva, en el orden social establecido. El análisis de nuestro marco normativo nos ofrece suficientes instrumentos para luchar contra estos desórdenes desechando la tentación de defender una regulación restrictiva de las libertades informativas on line o una intervención más intensa en Internet. Las políticas públicas de fortalecimiento democrático pueden ser un instrumento adecuado incidiendo en la colaboración público-privado para defender nuestro sistema democrático frente a los innumerables retos y amenazas que nos acechan.
Del juramento o promesa de acatar la Constitución en el ámbito parlamentario
Authors: Anguita Susi Alberto
Published: December 2020

La introducción, en el ámbito legal y reglamentario, del requisito del juramento o promesa para adquirir la plena condición de parlamentario ha suscitado en los últimos años una interesante polémica dado que este trámite, cuya trascendencia jurídica y política es discutible, ha sido utilizado por los parlamentarios para llevar a cabo proclamas y reivindicaciones de todo tipo, desvirtuándose de esta forma los límites constitucionales marcados por el Tribunal Constitucional en cuanto al cumplimiento de este requisito.
The Self-Concept of Ale Rasa Beta Rasa in the Orang Basudara Community in Ambon (Studies on the Community of Passo and Batumerah Country)
Authors: Matakena Fransina , Watloly Aholiab , Agustang Andi , Adam Arlin , Alim Andi
Published: December 2020

Ambon city is known as a city with diverse cultural wisdom. Local wisdom has moral values that are always taught from generation to generation by the Ambonese community orally or in writing. In Maluku culture, there are strong territorial ties to Genolosis in resolving conflicts or social structures built by ancestors to bridge differences in Maluku. One of the efforts to care for the Maluku community's social order is to revive the concept of ale rasa beta rasa in the orang Basudara community. The idea of "ale rasa beta rasa" is a manifestation of a cognitive effort by the Moluccans to create a harmonious, safe, and peaceful brotherly relationship. This research aims to analyze the implementation self-concept of ale rasa beta rasa in the orang Basudara community. This research uses a descriptive qualitative method—research location in Ambon City in the Study of Passo and Batumerah Community Communities, Maluku Province. Data collection was carried out by observation, in-depth interviews, and or focused group discussion (FGD). The research results show that Ale (you) taste beta (I) feel a concept that sociologically contains deep meaning for the Ambonese community. There are philosophical values in the expression Ale Rasa Beta Rasa . The value content is not only material for thought, but in the form of daily praxis to respect, feel, and carry out customary sacred duties. The values of Ale Rasa Beta Rasa function entirely and totally in carrying out the development of the life of the Basudara in Maluku. These values can operate functionally in building harmony, peace, progress, and the welfare of the Maluku nation's children. Ale and Beta have not only a communicative textual function but also a taste function as an expression of the heart and spirit of brotherhood. Ale rasa beta rasa becomes a means of reconciliation for conflicts between siblings. There is a content of philosophical values in the expression Ale Rasa Beta Rasa. it's just that the valuable content is still thoughtful and is manifested in everyday behavior to share, feel, and carry out sacred traditional events. There is a relationship between the values of Ale Rasa Beta Rasa and the self-concept and life context of the Basudara in Maluku, especially in the Pela relationship between Negeri Batumerah and Passo.
Maize Goddesses and Aztec Gender Dynamics
Authors: Collins Gabriel Silva , Foias Antonia E.
Published: December 2020

This article provides new evidence for understanding Aztec religion and worldviews as multivalent rather than misogynistic by analyzing an Aztec statue of a female deity (Worcester Art Museum, accession no. 1957.143). It modifies examination strategies employed by H. B. Nicholson amongst comparable statues, and in doing so argues for the statue’s identification as a specific member of a fertility deity complex—most likely Xilonen, the Goddess of Young Maize. The statue’s feminine nature does not diminish its relative importance in the Aztec pantheon, but instead its appearance and the depicted deity’s accompanying historical rituals suggest its valued position in Aztec life. As documented by Alan R. Sandstrom and Molly H. Bassett, modern Nahua rituals and beliefs concerning maize and fertility goddesses add to the conclusions drawn from the studied statue and suggest that historical Aztec religion had a complementary gender dynamic.
‘Franc cavallier de bona fe’, v. 8466: su alcuni elementi intertestuali nel Jaufre
Authors: Lecco Margherita Maria
Published: December 2020

On a very original narrative system, Jaufre's novel is constructed through inter-textual references and relationships withmany contemporary romance texts. The work presented here tries to highlight specific relationships that connect thenovel with the Première Continuation Perceval and with the novel by Renaut de Beaujeu Le Bel Inconnu.
Anne de Graville Translates Alain Chartier: Identifying the Manuscript Source in the Margins of B.N. fr. 2253
Authors: McRae Joan E.
Published: December 2020

An examination of the single manuscript of Anne de Graville’s Rondeaux, a ‘translation’ of Alain Chartier’s La Belle Dame sans mercy, as well as consideration of Carl Wahlund’s 1897 critical edition reveals that Anne used several manuscripts and early printed editions in establishing the version of Chartier’s poem written in the margins of BN fr 2253. The base exemplar was most likely St. Petersburg, National Library of Russia MS fr. f° v. XIV. 0007, with variants found in BN fr 20026, BN fr 924, and the early printed editions.
Dieta, drogas y cerebro: ¿Es la comida ultraprocesada una puerta de entrada a la adicción?
Authors: Blanco-Gandia M Carmen , Gonzalez-Portilla Macarena , Rodriguez-Arias Marta
Published: December 2020

Los alimentos altos en grasas y azúcares nos resultan placenteros porque producen una estimulación del circuito de recompensa, el mismo que activan las drogas. En un contexto en el que una dieta no saludable y el consumo de drogas son habituales desde la adolescencia, es importante investigar cuáles son sus consecuencias. Este artículo presenta la relación existente entre la ingesta de comida especialmente sabrosa, el sistema de refuerzo cerebral y el consumo de drogas. Estudios con modelos animales han mostrado que la ingesta intermitente de dieta rica en grasa durante la adolescencia incrementa el consumo de cocaína y etanol. La investigación reciente evidencia el papel fundamental de la dieta, tanto en la adquisición como en el tratamiento de las adicciones.
Disentangling nutrition facts from fiction: Towards healthy and sustainable consumption in industrialized societies
Authors: Gómez-Donoso Clara , Martínez-González Miguel A. , Bes-Rastrollo Maira
Published: December 2020

Over the last centuries, in the context of industrialization, globalization, and urbanization, profound dietary changes have occurred. Ubiquitous access to cheap, readily available and highly palatable unhealthy products, together with aggressive marketing that significantly influences social norms, have led to overconsumption of energy-dense, nutrient-poor foods. This has not only been associated with a higher prevalence of obesity and diet-related non-communicable diseases, but also with detrimental effects on the world’s natural resources. Broader and braver public health measures favoring the availability and affordability of healthy, minimally processed foods should be implemented in conjunction with educational strategies to re-encourage a healthy and sustainable food consumption.
Macro-and microfinance indicators as the “markers” of borderline dangerous economic states of the territory
Authors: Samoilova Liudmila Konstantinovna
Published: December 2020

Leaning on the analysis of the provisions of economic science, which article assesses interrelation between the links of financial system of the country on the one hand, and the impact of the level of financial soundness of businesses and households upon financial security of public law entities on the other; as well as dependence of satisfaction of needs of the individual in public goods on the fullness of centralized monetary funds. Such dependence requires peculiar approach towards determination of financial self-sufficiency of micro-and macroeconomic agents; however, the majority of elaborations focus solely on the public finance, which become the reason for emergence of borderline state of regional economy upon the criterion of its protection from threats – conditionally secure or pseudo secure. In this regard, the goal of this article lies in development of the system of financial-economic indicators and their threshold values; its implementation is aimed at identification of negative trend – indicators of destructive processes in the national economy. The following methods were applied in the course of this research: general scientific – analysis, synthesis, induction, deduction for revealing the peculiarities of ensuring economic security of public law entities in the financial sector; specific scientific – statistical analysis for assessing financial-economic parameters of development of the territory; methods of qualitative assessment of the systems for differentiating the regions upon the criterion of security from financial threats. Considering mutual impact of public and private finance, the author develops the system of financial-economic indicators, the positive dynamics of which testifies to consolidation of financial self-sufficiency of economy of the territory; while negative dynamics in the medium and long-term period testifies to destabilization of certain vital processes of macro - and micro-subjects. Its peculiarity consists in combination of basic and additional coefficients that reflect financial situation of economic agents of various level and determination of their “thresholds”. Implementation of the author's approach in assessment of functionality of financial system of the country is aimed at identification of occurrence causes of borderline dangerous economic states of the territories.
La reforma al proceso ejecutivo: estudio del impacto que sobre este tiene el análisis económico del derecho
Authors: Hernández Villarreal Gabriel
Published: December 2020

Múltiples y de antaño han sido las propuestas encaminadas a reformar el proceso ejecutivo, mas todas ellas han tenido que afrontar el hecho de que en éste se entroncan dos procedimientos que son de naturaleza diversa, lo que ha generado un desplazamiento hacia un tipo de proceso que ya no tiene como objeto único la ejecución, sino que también persigue la declaración del derecho. Adicionalmente, tales propuestas de cambio se han centrado en los aspectos normativos, dejando de lado —por lo menos en forma explícita— cualquier consideración acerca de la escuela de pensamiento más influyente en los últimos 30 años, como es la del análisis económico del derecho. Bajo ese contexto y desde una perspectiva liberal, propia de la corriente del denominado garantismo procesal, la presente obra no solo se ocupa de diferenciar las distintas clases de títulos ejecutivos y las variadas ejecuciones que podrían adelantarse con base en ellos, así como de proponer unos cambios en el diseño del procedimiento empleado para lograr el cumplimiento de las obligaciones que se reclaman por esta vía; sino además de exponer el impacto directo que sobre tales modificaciones tiene en una economía de mercado el análisis económico del derecho.
Reproducing kernel particle boundary element-free method for elasticity
Authors: Qin Yi-Xiao  , Cheng Yu-Min  ,   (1)上海大学上海市应用数学和力学研究所，上海  200072; (2)上海大学上海市应用数学和力学研究所，上海  200072;太原科技大学，太原  030024
Published: December 2020

By combining the reproducing kernel particle method (RKPM) and boundary integral equation method for elasticity, the reproducing kernel particle boundary element-free (RKP-BEF) method is presented in this paper. Formulae for the RKP-BEF method are derived. The discrete boundary integral equations of the RKP-BEF method are established by considering the numerical integral schemes and the treatment of singular integrals, and the formulae of the displacement and stress of inner points for the RKP-BEF method are given. The RKP-BEF method has a higher precision as the smoothness of the shape function of RKP method is the same as that of the kernel function, and the values of polynomials at interpolating points can be exactly reconstructed. Numerical examples are given for verifying the effectiveness and correctness of the RKP-BEF method presented in this paper.
Mei symmetry of generalized Hamilton systems with additional terms
Authors: Jia Li-Qun  , Zheng Shi-Wang  ,   (1)江南大学理学院，无锡  214122; (2)商丘师范学院物理与信息工程系,商丘  476000
Published: December 2020

The definition and the criterion of Mei symmetry of generalized Hamilton systems with additional terms is studied in this paper. A necessary and sufficient condition for Mei symmetry of systems to be Lie symmetry is given. The Hojman conserved quantity for the differential equation of motion of generalized Hamilton system with additional terms being Mei symmetry can be deduced indirectly by Lie symmetry. An example is given to show the application of this result.
A modification potential method for total cross section calculation of electron scattering by molecules at medium and high energies
Authors: Shi De-Heng  , Sun Jin-Feng  , Liu Yu-Fang  , Ma Heng  , Zhu Zun-Lue  ,   河南师范大学物理与信息工程学院,新乡  453007
Published: December 2020

Taking into consideration the overlapping effect of electron clouds between two atoms in a molecule, a modification method is presented which can be used to calculate the total cross sections for electron scattering from numerous molecules at medium and high energies. The modified complex optical potential composed of static, exchange, polarization plus absorption is directly employed to calculate the total cross sections for electron scattering from isoelectronic molecules (HCl, H2S, PH3 and SiH4) over the energy range 30—5000eV using the additivity rule model at Hartree-Fock level. The obtained quantitative molecular total cross sections are compared with those obtained by experiments and other theories wherever available, and good agreement is obtained. It is shown that the additivity rule model together with the modified complex optical potential can give much better results than the unmodified one. So, the modification potential method presented here can improve the accuracy of the total cross section calculations of electron scattering from molecules.
Analysis of energy and force of self-adatom on Pt(110) surface by modified analytical embedded-atom method
Authors: Shu Yu  , Zhang Jian-Min  , Xu Ke-Wei  ,   (1)陕西师范大学物理学与信息技术学院，西安  710062; (2)西安交通大学金属材料强度国家重点实验室，西安  710049
Published: December 2020

The energy and normal force of self-adatom on Pt(110) surface have been calculated by the modified analytical embedded atom method. The most stable position for a Pt adatom on Pt(110) surface is 0.11 nm above the hollow of the first layer atoms, and the best path for a Pt adatom migrating from a hollow to neighbor hollow is along the close-packed direction. On leaving the surface, the adatom will go through the repulsive, transitional and attractive regions, successively. In the repulsive and transitional regions, due to stronger pair interaction potential between adatom and the first layer atoms, the contour maps of the energy and normal force could be seen simply as a duplicate of the Pt(110) surface. This is consistent with the results of pair potential theory and embedded atom method. The complicated contour maps of the energy and normal force were obtained in the attractive region due to relatively increasing effects of the many-body interactions and nonspherical distribution of the electrons of the atoms in the crystal.
Experimental study of a transient X-ray laser pumped by a picosecond pulsed laser
Authors: Wang Chen  , Fang Zhi-Heng  , Wang Wei  , Xiong Jun  , Sun Jin-Ren  , Wu Jiang  , Fu Si-Zu  , Gu Yuan  , Wang Shi-Ji  , Zhang Guo-Ping  , Zheng Wu-Di  , Huang Guan-Long  , Guan Fu-Yi  , Xie Xing-Long  , Lin Zun-Qi  ,   (1)北京应用物理与计算数学研究所，北京  100088; (2)上海激光等离子体研究所，上海  201800; (3)中国科学院上海光学精密机械研究所，上海  201800
Published: December 2020

This paper presented the results of experimental studies on transient soft X-ray laser using a picosecond pulsed laser facility.A rather intensive Ni-like Ag X-ray laser at 13.9nm with output energy of about 5—10nJ was obtained by irradiating the solid flat targets with a several hundred picosecond long laser pulse in combination with an 1ps ultra-short laser pulse.
Research on pulse shape properties of high-power Nd:glass laser frequency tripling
Authors: Zhao Shu-Lin  , Zhu Bao-Qiang  , Zhan Ting-Yu  , Cai Xi-Jie  , Liu Ren-Hong  , Yang Lin  , Zhang Zhi-Xiang  , Bi Ji-Jun  ,   中国科学院上海光学精密机械研究所，上海  201800
Published: December 2020

On the laser driver “Shenguang Ⅱ”, eight fundamental beams have realized power balance. By changing detuning values of parameters of the frequency tripling systems, the output pulse shapes of the output beams are mutually compared. The experiment results indicate that for the type Ⅱ-type Ⅱ polarization-mismatch frequency tripling system, when the input intensity is about 1GW/cm2, of the three parameters that influence the freguency tripling efficiency, polarization detuning angle Δθp has the most important effect on the pulse shape. When all three parameters of tripling system are at the optimized values, the full width at half maximum of pulse shape τ reaches minimum. This work describes the method of crystal adjustment to actualize the power balance of the eight frequency tripling beams.
A compensated compact microstrip resonant cell with photonic band-gap performance
Authors: Gu Jian-Zhong  , Lin Shui-Yang  , Wang Chuang  , Yu Xiao-Jing  , Sun Xiao-Wei  ,   (1)中国科学院上海微系统与信息技术研究所，上海  200050; (2)中国科学院上海微系统与信息技术研究所，上海  200050;中国科学院研究生院,北京  100049
Published: December 2020

A compensated compact microstrip resonant cell (C-CMRC) with photonic band-gap (PBG) performance is presented in this paper. Two open microstrip stub-lines are added at the center of the compact microstrip resonant cell (CMRC) to compensate for the unbalanced change of inductance and capacitance in low pass band. It can significantly improve the return loss and insertion loss. Furthermore, the C-CMRC with capacitive loading leads to a stronger slow-wave and enlarged stop-band bandwidth. A low pass filter with 3 C-CMRC resonators in series has been designed according to the PBG performance. The period is only 0.15λg due to the slow-wave effect. Comparison with the general PBG period of 0.5λg, the circuit size is reduced effectively. The original CMRC and the C-CMRC with open stub lines are designed, fabricated and measured to validate the improved performance. A low pass filter with 3 C-CMRC resonators is also designed with 1.26dB insertion loss below 1.8GHz and more than 25dB stop-band from 2.6 to 9GHz.
Calculation of structure and properties of one-dimensional silica nanomaterials based on first-principle
Authors: Xu Can  , Cao Juan  , Gao Chen-Yang  ,   (1)兰州大学物理科学与技术学院，兰州  730000; (2)兰州大学物理科学与技术学院，兰州  730000;兰州大学磁学与磁性材料教育部重点实验室，兰州  730000
Published: December 2020

We have studied silica single and double chain based on two-membered ring and nanotubes based on three-membered ring using the density-functional theory at 6-31G(d) level. The average binding energy, electronic structure and vibration frequency were calculated. Our calculations show that the average binding energy and energy gap monotonically change with increasing SiO2 units. Infrared spectrum indicated that the frequency and intensity of radial and tangential vibration shift obviously. Radial vibration frequency shifts to high frequency while tangential vibration frequency shifts to low frequency showing the existence of quantum size effect and anisotropic property of vibration in SiO2 nanomaterial.
Laser induced thermoelectric voltage effect in La0.67Pb0.33MnO3 thin films doped with Ag
Authors: Tan Song-Lin  , Zhang Hui  , Cui Wen-Dong  , Yuan Yuan  , Zhang Peng-Xiang  ,   昆明理工大学光电子新材料研究所，昆明  650051
Published: December 2020

The La0.67Pb0.33MnO3 (LPMO) thin films doped with Ag on vicinal-cut LaAlO3 substrates were prepared using standard pulsed laser deposition technique, in which laser induced thermoelectric voltage (LITV) effect was found. With Ag doping level x (x is defined as,x=massAg/massLPMO) increasing from 0.00 to 0.10, the response time of LITV signals in LPMO thin films firstly decreases (reaching minimum at 0.06), and then increases (still less than that with zero Ag doping). Further, an optimal film thickness was found, at which the peak voltage and response time of LITV signals to reaches maximum and minimum, respectively. The response time of LITV in the LPMO thin films are substantially smaller than that of La0.67Ca0.33MnO3 thin films at the same Ag doping level.
The conduction process and the equivalent barrier height in ZnO-Bi2O3 based varistor ceramics
Authors: Cheng Peng-Fei  , Li Sheng-Tao  , Jiao Xing-Liu  ,   西安交通大学电力设备电气绝缘国家重点实验室，西安  710049
Published: December 2020

The relationship between the equivalent barrier height of ZnO-Bi2O3 based varistor ceramics and normalized applied voltage was studied and it was found that the equivalent barrier height is influenced by normalized voltage greatly. With the increase of normalized voltage the equivalent barrier height increases firstly, then changes little and finally decreases quickly. Because the Schottky barrier height at the reverse-biased side is higher than that at the forward-biased side, the equivalent barrier height is determined by the former. The changing trend of the equivalent barrier height with normalized voltage indicates three steps of conduction. Firstly, in low normalized voltage range the velocity of electron injection from the forward-biased barrier area into the amorphous layer at grain-boundary is lower than that of ejection from traps in the amorphous layer into the reverse-biased barrier area. Thus the equivalent barrier height increases with the growth of normalized voltage. Secondly, in medium normalized voltage range, the injection velocity and the ejection velocity of electron is equal and the equivalent barrier height reaches its maximum value. Finally, in high normalized voltage range the injection velocity of electron is quicker than the ejection velocity of electron and the equivalent barrier decreases with the increase of the normalized voltage. In the end the Schottky barrier will break electrically. At the same time the relationship between the equivalent barrier height and the leakage current was analyzed and it was found that the leakage current is determined by an exponential function of the difference between the equivalent barrier heights when normalized voltage is 1 and 0.75.
Core-level photoemission of Sm fullerides
Authors: Wang Xiao-Xiong  , Li Hong-Nian  ,   浙江大学物理系，杭州  310027
Published: December 2020

Phases and core-levels of Sm-intercalated C60 thin films are researched with X-ray photoemission spectroscopy. The solid solution phase dominates until the stoichiometry of Sm0.5C60. Below the intercalation level of Sm2.75C60, the sample is phase-separated into the solid solution phase and Sm2.75C60, while the sample is not the mixture of Sm2.75C60 and Sm6C60 with the Sm concentration higher than Sm2.75C60. Experimental data of Sm 4f and 4d clearly reveal the valence state of Sm is divalent for Sm fullerides. Two subpeaks of divalent Sm 3d5/2 level are found.
Effect of polymer conductance on polarization properties of 0-3 piezoelectric composite
Authors: Xu Ren-Xin  , Chen Wen  , Zhou Jing  ,   武汉理工大学材料科学与工程学院，武汉  430070
Published: December 2020

The equivalent electrical model of 0-3 piezoelectric composite was proposed to analyze the effect of polymer conductance on the polarization properties of the composite. The relationship between the polarization properties in polyaniline-doped 0-3 lead zirconate titanate/pelyvinylidene fluoride composite and the polymer conductance was studied. Both the theoretical and experimental results show that the polarization of the composite increases with the polymer conductance.
Preparation and luminescence characteristics of BaZr(BO3)2:Eu
Authors: Gou Jing  , Wang Yu-Hua  , Li Feng  , He Ling  ,   兰州大学物理科学与技术学院，兰州  730000
Published: December 2020

BaZr(BO3)2:Eu phosphor was successfully prepared by thermal decomposition of the corresponding nitrates. The luminescence properties of BaZr(BO3)2:Eu were investigated under 254 and 147nm excitation. In the emission spectrum of BaZr(BO3)2:Eu excited by 254nm, the main peak is located at about 612nm, which is due to the electric dipole transition of 5D0—7F2 of Eu3+. But in the emission spectrum excited by 147nm, the main peak is located at about 592nm, which is due to the magnetic dipole transition of 5D0—7F1 of Eu3+. Analysis of the excitation spectra indicated that Eu3+ occupying the non-centrosymmetric site Ba2+ can be excited preferentially by 254nm light, but under 147nm excitation, Eu3+ occupying centrosymmetric site Zr4+ can be excited preferentially. It shows that BaZr(BO3)2:Eu is not a suitable red phosphor for plasma display panel.
Optical properties of laser ablated Ag:BaTiO3 composite films
Authors: Yang Guang  , Chen Zheng-Hao  ,   (1)华中科技大学光电子科学与工程学院,武汉  430074;中国科学院物理研究所,北京  100080; (2)中国科学院物理研究所,北京  100080
Published: December 2020

Nanocomposite films composed of Ag particles embedded in BaTiO3 matrix were grown on MgO(100) substrates by pulsed laser deposition. The structures of the films were determined by X-ray diffraction. The size and shape of the Ag particles were observed by transmission electron microscopy. The X-ray photoelectron spectroscopy results showed that Ag is in the metallic state. The optical absorption properties were measured from 300 to 800nm, and the absorption peaks due to the surface plasmon resonance of Ag particles were observed. With increasing annealing temperature and Ag concentration, the peak absorption increased and shifted to longer wavelength (red-shift).
Vacancy-type defects induced by He-implantation in ZnO studied by a slow positron beam
Authors: Chen Zhi-Quan  , Kawasuso Atsuo  ,   (1)日本原子力研究所，日本群马  370-1292; (2)武汉大学物理系，武汉  430072
Published: December 2020

ZnO single crystals were implanted with He ions of energy of 20—100keV. The total implantation dose was 4.4×1015cm-2. Doppler broadening of positron annihilation spectra were measured using a slow positron beam to study the implantation-induced defects. The results suggest that after implantation, divacancies or larger vacancy clusters are produced. After annealing below 400℃, He impurity begins to occupy the vacancy clusters. Upon further annealing above 400℃, the vacancy clusters grow in size. At annealing temperature of above 800℃, He atom is released from the vacancy clusters, and the vacancies begin to recover and are annealed out at 1000℃.
Spectra analysis of Yb: Y3Al5O12 crystals with different Yb doping concentration
Authors: Wang Xiao-Dan  , Zhao Zhi-Wei  , Xu Xiao-Dong  , Song Ping-Xin  , Jiang Ben-Xue  , Xu Jun  , Deng Pei-Zhen  ,   (1)中国科学院上海光学精密机械研究所，上海  201800; (2)中国科学院上海光学精密机械研究所，上海  201800;中国科学院研究生院，北京  100049
Published: December 2020

Yb：Y3Al5O12(Yb:YAG) single crystals with Yb3+ doping level of 5.4at%, 16.3at%, 27.1at%, 53.6at%, and 100at% were grown by the Czochralski method. The effects of different Yb3+ doping level on the absorption spectra and fluorescence spectra were studied. The results showed that the real absorption coefficient of the absorption peaks increases linearly with the increasing of Yb3+ doping level in Yb:YAG crystals. Absorption band oscillator strengths of Yb：YAG crystals were calculated with Smakula formula and the effects of different Yb3+ doping level on the oscillator strengths were also studied. The concentration quenching of fluorescence was observed when the Yb3+ doping level reached 27.1at% in Yb:YAG crystals. The shape of fluorescence spectra of Yb:YAG could be significantly influenced when the Yb3+ doping level is higher than 53.6at%.
Theoretical research of magnetic drug targeting guided by an outside magnetic field
Authors: Xiong Ping  , Guo Ping  , Xiang Dong  , He Ji-Shan  ,   (1)南华大学数理学院，衡阳  421001; (2)中南大学信息物理工程学院，长沙  410083; (3)中南大学信息物理工程学院，长沙  410083；南华大学数理学院，衡阳  421001
Published: December 2020

This paper reports the systematic study of supporting forces and moving track of the ferromagnetic drug particulates in target therapy is performed using the electromagnetic theory. We have obtained the rules of action and effect of magnetic fields and blood stream and the walls of blood vessel on the ferromagnetic drug particulates. At the same time, we also give out the new method of magnetic drug targeting, namely, we make use of the magnetic navigating device located outside human body to produce the variable magnetic fields to realize magnetic drug targeting. The result of our research gives the conditions of carrying out magnetic medication target treatment.
New form of the Kerr solution and its tunneling radiation
Authors: Jiang Qing-Quan  , Wu Shuang-Qing  ,   (1)华中师范大学物理科学与技术学院,武汉  430079; (2)华中师范大学物理科学与技术学院,武汉  430079;西华师范大学理论物理研究所,南充  637002
Published: December 2020

Parikh recently viewed the black hole radiation as a semi-classical tunneling process, and showed that the radiation spectrum for the static Schwarzschild and Reissner-Nordstrm black holes is not pure thermal after considering the self-gravity interaction. In this paper, we adopt the new form of the Kerr solution presented by Doran and extend Parikh's work to investigate the tunneling radiation of a rotating black hole. We obtain a corrected radiation spectrum, which is related to the change of Bekenstein-Hawking entropy. It is not pure thermal, but is consistent with the underlying unitary theory.
Anti-control of chaos on the degenerate optical parametric oscillator
Authors: Feng Xiu-Qin  , Shen Ke  ,   长春理工大学物理系,长春  130022
Published: December 2020

We present a method of anti-control of chaos on the degenerate optical parametric oscillator via modulating the reduced decay rate of the fundamental mode with a sinusoid wave to convert the steady state without output of subharmonical mode or periodic state into chaotic state. Numerical simulation shows that there are different chaotic orbits corresponding to different modulation amplitude and modulating angular frequency only if the maximum Lyapunov exponent of the system is positive. The maximum Lyapunov exponent as a function of modulation amplitude and modulating angular frequency is calculated respectively. We point out here that converting the steady state without output of subharmonical mode into chaotic state is more difficult than converting the periodic state into chaotic state because narrower range of modulation amplitude and modulating angular frequency can be used in the former case.
Observation of ultrafast excited-state dynamical evolution in B800 absorption band of light harvesting 2 (LH2) extracted from Rb. Sphaeroides 601
Authors: Liu Wei-Min  , Liu Yuan  , Xu Chun-He  , Qian Shi-Xiong  ,   (1)复旦大学物理系,上海  200433; (2)中国科学院植物生态生理研究所，上海  200032
Published: December 2020

Photodynamics of two kinds of peripheral antenna complexes light harvesting 2 (LH2) of Rb. Sphaeroides 601, namely the native LH2 and B800-released LH2, where B800-BChls were partially or completely removed with different pH treatments, were studied using femtosecond pump-probe technique at different laser wavelengths. The obtained results for these samples demonstrate that under the excitation around B800 absorption band, the photoabsorption and photobleaching dynamics are caused by the direct excitation of upper excitonic levels of B850 and excited state of B800 pigments, respectively.
Study on thermal damage to balsaming lens induced by multi-pulse laser
Authors: Niu Yan-Xiong  , Yu Ye  , Duan Xiao-Feng  , Zhang Peng  , Wu Dong-Sheng  , Wang Xiu-Sheng  ,   (1)解放军军械工程学院光学与电子工程系,石家庄  050003; (2)解放军军械工程学院光学与电子工程系,石家庄  050003;清华大学精密仪器测试技术与仪器国家重点实验室,北京  100084;天津大学精密仪器与光电子工程学院,光电信息技术科学教育部重点实验室,天津  300072
Published: December 2020

Balsaming lens will be damaged when irradiated by laser of certain power. The model of one-dimension unstable temperature field during the interaction between multiple-pulse laser and material is established, and the transient temperature distribution of glass material of balsaming lens is calculated. The fusion moment and the moment when cementing material melts are researched by means of numerical calculation. Experiments about damage in several balsaming lenses of the same kind irradiated by multiple-pulse CO2 laser, the parameters of which are 10Hz, 200ns and 20WM, are carried out. It is found that when the irradiation time reaches 12s, the front surface of balsaming lens is molten. When the irradiation time reaches 30s, colorized dapples are suddenly formed in the cementing layer of samples. It indicates that cementing material is intenerated and balsaming lens is thoroughly damaged. The result of theoretical analysis exhibits good agreement with the experimental result.
Structure and analytic potential energy functions of the molecules BH2 and AlH2
Authors: Sun Jin-Feng  , Wang Jie-Min  , Shi De-Heng  , Zhang Ji-Cai  ,   (1)河南师范大学物理与信息工程学院,新乡  453007; (2)洛阳师范学院物理与电子科学系,洛阳  471022;河南师范大学物理与信息工程学院,新乡  453007
Published: December 2020

Quadratic configuration interaction (QCISD) method has been used to optimize the possible ground-state structures of BH2 and AlH2 molecules. The results show that the ground state of BH2 molecule has C2v symmetry and is in the 2A1 state. The parameters of structure and the harmonic frequencies are RBH=0.1187nm, ∠HBH=128.7914°, De=3.65eV,ν1(a1)=1020.103cm-1,ν2(a1)=2598.144cm-1 and ν3(b2)=2759.304cm-1, respectively. The results also show that the ground state of AlH2 molecule has C2v symmetry and is in the 2A1 state. The parameters of structure and the harmonic frequencies are of RAlH=0.1592nm, ∠HAlH=118.095°, De=2.27eV,ν1(a1)=780.81cm-1,ν2(a1)=1880.81cm-1 and ν3(b2)=1910.46cm-1, respectively. The potential energy functions of BH2 and AlH2 have been derived from the many-body expansion theory. The potential energy functions describe correctly the configurations and the dissociation energies of the two ground-state molecules. Molecular reaction kinetics of BH+H and AlH+H based on the potential energy functions is discussed briefly.
Quantitative analysis of the trace element in Cu-Pb alloy by the LIBS
Authors: Cui Zhi-Feng  , Zhang Xian-Yi  , Yao Guan-Xin  , Wang Xiao-Li  , Xu Xin-Sheng  , Zheng Xian-Feng  , Feng Er-Yin  , Ji Xue-Han  ,   安徽师范大学原子与分子物理研究所，芜湖  241000
Published: December 2020

Under the optimum experimental condition, the analytical spectral lines of the Fe and Ni trace elements in Pb-Cu alloy are determined in the experiment. The laser-induced breakdown spectroscopy(LIBS) calibration curves of the Fe and Ni trace elements are also determined in buffer gases He, Ar, Air and in vacuum. The standard fit errors for the calibration curves are in the range from 0.02 to 0.08.
Precision measurement of excited spectra of oxygen ions
Authors: Yang Zhi-Hu  , Zhang Xiao-An  , Zhao Yong-Tao  , Yin Wei-Wei  , Li Ning-Xi  ,   (1)中国科学院近代物理研究所,兰州  730000; (2)中国科学院近代物理研究所,兰州  730000;咸阳师范学院物理系,咸阳  712000
Published: December 2020

Spectra of the ionized oxygen atom were researched with the Pro-500i monochromator equipped with CCD. The beam foil method was used at energy of 2 MeV in a 2×1.7 Tandem accelerator. In this work, we report 201 spectral lines determined in the region 250—350 nm, and most spectral lines were attributed to n，l energy level transitions from OⅡ to OⅣ atoms. Our experimental results are in good agreement with existing theoretical calculations. Many lines reported in this paper have not been measured in past experiments, and a majority of them are week transitional lines.
The linear theory of helically corrugated gyro-TWT
Authors: Zhang Ya-Xin  , Zhu Da-Jun  , Liu Sheng-Gang  , Wang E-Feng  ,   电子科技大学物理电子学院,成都  610054
Published: December 2020

Based on the theory of coupled-wave, the dispersion equation and coupling condition of helically corrugated waveguide are obtained by the method of impedance perturbation. Then the nonlinear coupled equations are obtained from the relativistic equation which describes the motion of electrons. The numerical calculation and analysis of cold cavity by PIC software are applied to analyze both hot and cold dispersion characteristics of this waveguide.
Geometry and electronic properties of bimetallic AunY(n=1—9) clusters
Authors: Mao Hua-Ping  , Wang Hong-Yan  , Zhu Zheng-He  , Tang Yong-Jian  ,   (1)四川大学原子分子物理所,成都  610065; (2)中国工程物理研究院激光聚变研究中心,绵阳  621900; (3)重庆三峡学院化学与环境工程系, 万州  404000;四川大学原子分子物理所,成都  610065
Published: December 2020

A systematic study on the equilibrium geometries and electronic properties of Y-doped gold clusters has been studied by density functional theory calculations. The stability and electronic properties of doped gold clusters are similar to that of pure gold clusters. Their inonization potential and electron affinities alter with odd-even oscillation as a function of the number of atoms. The magic-number behaviour is observed in the Y-doped gold cluster cations, which is in good agreement with the mass spectrum experiment. Thus Au2Y+ and Au6Y+ are more stable than other clustered cations. The most stable isomers of the Y-doped gold cluster tend to have the maximized coordination number of Au atom.
Radiation trapping forces acting on a two-layered spherical particle in a Gaussian beam
Authors: Han Yi-Ping  , Du Yun-Gang  , Zhang Hua-Yong  ,   西安电子科技大学理学院，西安  710071
Published: December 2020

Based on the generalized Lorenz-Mie theory (GLMT), the incident fundamental Gaussian beam is expanded in terms of the vector spherical harmonics. We present an expression of radiation trapping forces acting on a multilayered spherical particle in a Gaussian beam by using the theory of electromagnetic momentum, and, as an example, numerical results are given to an axial two-layer absorbing spherical particle, along with a discussion about the influence of the beam waist radius, relative complex refractive index and thickness of the two layers on trapping forces.
The beam quality of vectorial nonparaxial Hermite-Laguerre-Gaussian beams
Authors: Kang Xiao-Ping  , He Zhong  , Lü Bai-Da  ,   (1)琼州大学物理系，五指山  572200; (2)四川大学激光物理与化学研究所,成都  610064; (3)四川大学激光物理与化学研究所,成都  610064;琼州大学物理系，五指山  572200
Published: December 2020

Based on the vectorial Rayleigh-Sommerfeld diffraction integrals, the closed-form expressions of vectorial nonparaxial circularly polarized Hermite-Laguerre-Gaussian (HLG) beams in the far-field are derived. The vectorial nonparaxial circularly polarized Gaussian beam is treated as a special case of our general formulae. The power in the bucket (PIB) is extended to the nonparaxial regime, where the intensity is replaced by the z component of the time-averaged Poynting vector, and used to characterize the beam quality of nonparaxial beams in the far field. Numerical calculation and analysis show the dependence of the PIB of vectorial nonparaxial HLG beams on the waist width-to-wavelength ratio w0/λ, as well as on the parameter α, mode indexes n and m, and bucket's size chosen.
Study on the performance of high precision achromatic retarder
Authors: Zhao Pei-Tao  , Li Guo-Hua  , Wu Fu-Quan  , Peng Han-Dong  , Zhang Yin-Chao  , Zhao Yue-Feng  , Wang Lian  , Liu Yu-Li  ,   (1)曲阜师范大学激光研究所，曲阜  273165; (2)曲阜师范大学激光研究所，曲阜  273165;中国科学院研究生院，北京  100049;中国科学院安徽光学精密机械研究所，国家863计划大气光学重点实验室，合肥  230031; (3)中国科学技术大学化学物理系，合肥  230026; (4)中国科学院安徽光学精密机械研究所，国家863计划大气光学重点实验室，合肥  230031; (5)中国科学院研究生院，北京  100049;中国科学院安徽光学精密机械研究所，国家863计划大气光学重点实验室，合肥  230031
Published: December 2020

Achromatic retarder is a device to be used in wide spectral range for optical phase retardation. The phase retardation is constant when the wavelength is changed. Modern polarization technology and optical modulation demand high precision for the measurement of achromatic retarder. Based on the principle of polarizing modulation, this paper sets up an experiment system for measuring the phase retardation for high precision achromatic retarder of rhombic shape. The results indicate that the principle of high precision achromatic retarder is correct and the measurement error is less than 1%, it reaches a high precision and satisfies the requirement of application.
Research on the diffraction characteristics of phase modulated laser beams dispersed spectrally
Authors: Jiang Xiu-Juan  , Zhou Shen-Lei  , Lin Zun-Qi  , Zhu Jian  ,   (1)中国工程物理研究院上海激光等离子体研究所，上海  201800; (2)中国科学院上海光学精密机械研究所高功率激光物理国家实验室，上海  201800
Published: December 2020

It is simulated numerically the transmission of beams phase modulated and spectrally dispersed by the unit for smoothing by spectral dispersion put in the laser driver for inertial confinement fusion. The results show that the diffraction spot of a spectrally dispersed beam becomes larger and its near-field uniformity is improved, while there exists area where the intensity is nearly even within the far-field spot. The effects of the main parameters of the electro-optic phase modulator and the grating in the unit on the diffraction characteristics of the beams are further discussed, and it is found that intensity modulation emerges in the far-field spot under some conditions.
Electromagnetic theory of enhanced diffraction for a binary metallic grating
Authors: Liu Min-Min  , Zhang Guo-Ping  , Zou Ming  ,   (1)华中师范大学物理科学与技术学院，武汉  430079; (2)华中师范大学物理科学与技术学院，武汉  430079;湖北民族学院物理系，恩施  445000; (3)华中师范大学物理科学与技术学院，武汉  430079;武汉化工学院理学院，武汉  430074
Published: December 2020

The diffraction electromagnetic field is calculated by rigorous coupled-wave theory for a binary metallic grating of nanometric dimensions. We discuss in detail the influence of the ratio of grating ridge width to grating period, the depth of groves and the angle of incident wave for the enhancement of diffraction electromagnetic field. Calculations for silver grating and gold grating result in some important conclusions.
Emission spectrum of a cascade three-level atom with orthogonal dipoles interacting with a single-mode field
Authors: Zhou Qing-Chun  ,   江苏科技大学物理系,镇江  212003
Published: December 2020

Under the assumption of orthogonal electrical dipole moments of a cascade three-level atom with equally spaced energy levels, the full quantum theory is applied to study the emission spectrum of the atom interacting resonantly with a single-mode electromagnetic field in an ideal cavity. Spectral calculations for both the intensity-dependent and intensity-independent couplings are performed and the spectra in the cases of orthogonal dipole moments and parallel dipole moments are compared. It is found that some spectral lines disappear for the atom with parallel dipoles due to destructive interference leading to fewer lines compared with the spectrum of the atom with orthogonal dipole moments.
Impact of a cover layer to high impedance ground plane band-gap
Authors: Zheng Qiu-Rong  , Fu Yun-Qi  , Lin Bao-Qin  , Yuan Nai-Chang  ,   国防科学技术大学电子科学与工程学院，长沙  410073
Published: December 2020

In this paper a kind of high impedance substrate surface covered with different dielectric layer is analyzed by periodic moment method, their band-gap diagrams are described. Meanwhile, the propagating property of surface wave of the high impedance ground plane with different dielectric covering is tested, the results of theoretic analysis are validated. Our results can be helpful for the design of high impedance ground plane with a dielectric cover layer.
Study on displacement measurement with optical feedback of dual frequency laser
Authors: Mao Wei  , Zhang Shu-Lian  , Zhang Lian-Qing  , Zhu Jun  , Li Yan  ,   清华大学精密测试技术及仪器国家重点实验室，北京  100084
Published: December 2020

A novel displacement measurement with optical feedback of dual frequency laser has been put forward, which has been investigated both theoretically and experimentally. Intensities of the laser and the two orthogonally polarized modes are detected. It is found that the laser output power will be modulated when the object moves. When the displacement of the object is half wavelength, the signal of optical feedback has two peaks with the same depth of modulation. So the resolution of displacement sensor can be doubled. It is also found that when the object changes its moving direction, the order of intensity variation of the two modes will be changed. It can be used to judge the direction of the displacement. The simulation results are in good agreement with the experimental results. It is indicated that the sensor has advantages of simplicity, high resolution, direction identification cepability, large measurement range, operation in high optical feedback regime, and so on.
New scheme for wavelength monitoring with 1pm resolution
Authors: Feng Yao-Jun  , Cao Zhuang-Qi  , Chen Lin  , Shen Qi-Shun  ,   上海交通大学物理系，上海  200240
Published: December 2020

Based on the study of the metal-cladding waveguide on submillimeter scale, a new scheme for wavelength monitoring is proposed in this paper. The free space coupling technique is utilized to excite the ultrahigh-order mode to act as a probe, which is considered to be very sensitive to the wavelength change. It is experimentally demonstrated that a wavelength drift of 1pm is monitored.
Compensation of temporal dispersion for acousto-optical deflector scanning femtosecond laser
Authors: Li De-Rong  , Lü Xiao-Hua  , Wu Ping  , Luo Qing-Ming  , Chen R. Wei  , Zeng Shao-Qun  ,   (1)生物医学光子学教育部重点实验室，华中科技大学，武汉  430074; (2)生物医学光子学教育部重点实验室，华中科技大学，武汉  430074;耶鲁大学神经生物学系，New Haven,CT,06511; (3)耶鲁大学神经生物学系，New Haven,CT,06511
Published: December 2020

The temporal dispersion effect and compensation approach of femtosecond laser scanning by an acousto-optical deflector (AOD) was studied. The group delay dispersion (GDD) of a single AOD at 800nm wavelength is about 9300fs2. Based on the principle of angular dispersion of AOD and the prism, an approach that uses single prism pre-compensating an AOD for the temporal dispersion was designed and demonstrated by experiments. At center frequency (70MHz) of the AOD, a 398fs pulse is compressed to 122fs, the range of pulse width on the entire bandwidth (50MHz—90MHz) is 120fs—180fs. This approach is demonstrated to be effective on compensation of temporal dispersion for AOD scanning femtosecond laser.