bluuebunny/crossref_metadata_2025 huggingface dataset:
La violencia contra las mujeres con discapacidad en tiempos de COVID-19 y experiencias grupales de sororidad online
Authors: Castellanos-Torres Esther , Caballero Pérez Isabel
Published: December 2020

Castellanos-Torres, E. y Caballero, I. (2020). “La violencia contra las mujeres con discapacidad en tiempos de COVID-19 y experiencias grupales de sororidad online”. Revista Española de Discapacidad, 8(2).
Consecuencias y retos de la sostenibilidad en relación con la discapacidad tras el COVID-19
Authors: Martín Rodríguez José Antonio
Published: December 2020

Martín, J. A. (2020). “Consecuencias y retos de la sostenibilidad en relación con la discapacidad tras el COVID-19”. Revista Española de Discapacidad, 8(2)
Sello de calidad profesional en atención temprana
Authors: Belda Oriola Juan Carlos , Rodríguez Suárez Antía
Published: December 2020

Belda, J. C. y Rodríguez, A. (2020). “Sello de calidad profesional en atención temprana”. Revista Española de Discapacidad, 8(2).
Clinical Features of Idiopathic Nephrotic Syndrome and Factors Associated with its Relapse in Children: A Population-Based Study
Authors: Seyezadeh Abolhassan , Tohidi Mohamad Reza , Sheikhi Somaye , Seyedzadeh Mohammad Saleh , Hookari Sara
Published: December 2020

Background: Idiopathic Nephrotic Syndrome (INS), which is caused by a defect in the glomerular filtration barrier, is the most common chronic glomerular disease in children. Objectives: The present study aimed to assess the clinical features of INS and some recurrence-related factors in children. Methods: This population-based, cross-sectional study was conducted on 302 children with INS referring to the Pediatric Nephrology Clinic of Imam Reza Hospital of Kermanshah city, Iran, during 1998-2018. Results: The mean age (SD) at the time of diagnosis and the follow-up duration were 4.87 (2.89) years and 49.83 (37.52) months, respectively. The numbers of boys and girls were 185 (61.9%) and 114 (38.1%), respectively. The mean number (SD) of recurrences, annual recurrence rate during the follow-up, and the time to the first recurrence after responding to treatment were 1.71 (1.91), 0.48 (0.77), and 10.15 (10.63) months, respectively. The most common type of INS was steroid-dependent/frequent relapse, with a frequency of 151 (50.5%). Furthermore, 33 (11.0%) and 266 (89.0%) patients were resistant and respondent to treatment, respectively. There was a statistically significant relationship between age at the time of diagnosis and the type of INS (P = 0.007). Conclusions: This study revealed a statistically significant association between higher age and steroid resistance. However, in steroid responders, there was no relationship between gender, age at the time of diagnosis, and the time to the first recurrence, and the recurrence rate.
Serum Copper Level in Patients with Heart Failure and Its Related Factors
Authors: Taghavi Sepideh , Naderi Nasim , Amin Ahmad , Mobini Sara , Safavirad Amine , Malakouti Mahfam
Published: December 2020

Background: Congestive Heart Failure (CHF) is a debilitating disorder that affects 1-2% of the general population. Despite recent advances in the management of heart failure, symptomatic heart failure still has a poor prognosis, so the importance of evaluating these patients is emphasized. The micronutrients are not produced in the body, but they should be taken in the required amount of diet, and their required amount is generally less than 100 mg per day. Copper deficiency leads to hypertrophic cardiomyopathies in several experimental models, which ultimately leads to systolic and diastolic cardiac function impairment. Copper deficiency is the only nutritional factor that increases cholesterol, blood pressure, homocysteine, and uric acid, leads to glucose intolerance, and increases thrombotic and oxidative damage. Objectives: The aim of this assessment is to examine the serum copper level in patients with Heart failure hospitalized in Rajaie Cardiovascular, Medical and Research Center and its related factors in the period of 2017-18. Methods: This as a prospective descriptive study conducted on patients with heart failure hospitalized in Rajaee Cardiovascular, Medical and Research Center. Research variables included serum copper level, Pro-BNP serum level, heart failure etiology, Seattle Heart Failure Model (SHFM), age, gender, BMI, history of diabetes, history of airway disease, duration of heart failure diagnosis, smoking, presence of shortness of breath, the amount of ejection fraction (EF), initial blood pressure, serum hemoglobin levels, white blood cell count, creatinine, cholesterol, sodium and uric acid. Accordingly, 80 patients with heart failure have been evaluated and the results of the evaluation of patients have been put together based on the aims of the study. Results: Of the evaluated cases, there were 52 (65%) male and 35 (28%) female. The mean and standard deviation of the patients' age was 49.9 ± 16.2 years, also the mean and standard deviation of serum copper was 189.28 ± 58.3 (range:80-150). The evaluated indices in this study included severe NYHA (P = 0.90), ejection fraction (EF) in echocardiography (P = 0.40), serum Pro BNP (P = 0.45) and prognosis of disease according to Seattle Heart Failure Model (P = 0.63), because non of the patients copper serum level were under the baseline we could not found statistically significant relationship between serum copper level and EF, pro BNP, NYHA function class and prognosis of the disease according to Seattle Heart failure model, while there was a significant statistical relationship between serum copper levels and etiology of heart failure (P = 0.02). Conclusions: Copper does not have a significant effect on the status of patients with heart failure, and only some differences were observed in the etiology of heart failure.
The Effectiveness of a Nursing Care Program Supplemented with Iron Intake on Anemia and Fatigue in Cancer Patients Undergoing Chemotherapy
Authors: Barahoui Zeinab , Kiyani Fatemeh , Lashkari Tayebe , Tasbandi Mojtaba
Published: December 2020

Background: Fatigue is one of the most common complications of cancer. Anemia can be one of the most prevalent causes of fatigue in cancer patients. Objectives: The present study aimed to explore the effectiveness of a nursing care program supplemented with iron intake on the anemia and fatigue in cancer patients undergoing chemotherapy. Methods: The present study was conducted in a quasi-experimental design on two groups of 90 cancer patients in selected hospitals. The participants were selected via convenience sampling and were randomly assigned to the control and intervention groups. Before the intervention, the Functional Assessment of Cancer Therapy - Anemia (FACT-An) was completed by the patients in both groups. The patients in the control group did not receive any special care other than receiving 150 mg of iron daily. However, the patients in the intervention group received 150 mg of iron daily and attended a nursing care program with four individual training sessions (one session per week). Follow-up was performed for three weeks, and the questionnaire was completed again by the participants in both groups. The collected data were analyzed using the independent samples t-test, paired-samples t-test, and chi-square test in SPSS software (version 22). The data analysis process was performed at a significance level of less than 0.05. Results: The mean scores for the patient hemoglobin in the intervention and control groups after the intervention were 11.84 ± 0.58 and 11.10 ± 67.29, showing a significant increase in favor of the intervention group (P < 0.001). Furthermore, the results of the independent samples t-test showed that the mean score of fatigue for the patients in the intervention group (29.37 ± 9.56) was significantly lower than that of the participants in the control group (47.55 ± 11.22) (P < 0.001). Conclusions: The present study showed that the implementation of a nursing care program for cancer patients receiving iron supplementation positively affects iron-related blood parameters and fatigue among these patients. Therefore, to control cancer patients' fatigue, medical staff must pay special attention to these training and care programs supplemented with iron intake.
The Effect of Teach-Back Training on Self-Care and Readmission of Patients with Heart Failure
Authors: Mesbahi Hediyeh , Kermansaravi Fatihe , Kiyani Fatemeh
Published: December 2020

Background: Teach-back training is one of the interactive teaching methods that assess the learner's understanding by asking questions and provide a proper educational context for behavior change. Involving patients with heart failure in treatment is a top priority. Objectives: Accordingly, the present study aimed to explore the effect of teach-back training on self-care and readmission of patients with heart failure. Methods: The present quasi-experimental study was conducted on 80 patients with heart failure in the Coronary Care Unit (CCU) and Post Coronary Care Unit (PCCU) of teaching hospitals affiliated to Zahedan University of Medical Sciences in southeastern Iran in 2019. The patients were selected via the convenience sampling method and randomly placed into two intervention and control groups. In the intervention group, self-care training was performed individually using the teach-back method in four sessions, each lasting 30 to 60 minutes. In contrast, the participants in the control group conventionally received self-care training. The instruments used to collect the data were the demographic information form and the European Heart Failure Self Care Behavior (EHFSCB). The EHFSCB was completed by the participants in the two groups in two stages before and three months after the intervention. The number of readmissions and the number of visits to the doctor at the end of the third month after discharge were recorded for all patients by directly asking the patients. The collected data were analyzed using SPSS-22 software, the independent samples t-test, paired-samples t-test, and chi-square test at a significant level of P < 0.05. Results: After three months, the mean scores of total self-care behaviors during the intervention were significantly different between the two groups (P < 0.001). Besides, the average number of readmissions due to heart disease three months after the intervention showed the positive effect of the intervention in reducing readmissions in patients in the intervention group (P = 0.002). Conclusions: This study showed that teach-back training could affect self-care behaviors positively and reduce the number of readmissions of patients with heart failure. Therefore, it is recommended that nurses use this training method to teach self-care behaviors to heart patients.
Appscapes in everyday life
Authors: Lai Signe Sophus , Flensburg Sofie
Published: December 2020

It has long been acknowledged that the use of ‘free’ mobile apps comes at a price, but few empirical studies have looked into this supposed trade-off. This article combines qualitative interviews with mappings of infrastructures for datafication in order to study the implications of mobile app usage from the perspective of individual users. It analyses users’ understanding of online tracking, maps the infrastructural tenets of mobile datafication, and finds a disconnect between what users believe happens to their data and the actua data harvesting and distribution mechanisms of their apps. We thereby argue that users’ resigned attitudes should be understood in light of the material conditions of the app economy and, as such, that user and infrastructure studies should join forces in exploring and enhancing users’ agency, empowerment and emancipation.
Analýza orientalizmu v Bowieho skladbe „China Girl“ / Analysis of Orientalism in David Bowie’s Song “China Girl”
Authors:   Univerzita Palackého v Olomouci, Filozofická fakulta, Katedra asijských studií, Křížkovského 14, 779 00 Olomouc, Czech Rep., Vaseková Veronika
Published: December 2020

Among other areas, Orientalism is widespread in pop music. The aim of this essay is to analyze Chinese Orientalism in the song and video “China Girl” by British singer David Bowie. Bowie is known for his interest in Asian cultures, signified most notably by the influence of Japanese style on Bowie’s musical performances, among other examples. The song “China Girl” initiated a passionate discussion about racist motives in the video clip; although Bowie is known for his opposition to racism, and the intended purpose of the video was to criticize racism, it is clear from the public and professional discussion that this intention may have failed. Displaying racist motives without a proper commentary is always problematic. Although Bowie’s song “China Girl” is often mentioned in academic texts as an example of Orientalism, its detailed analysis has not yet been processed. In my analysis, I will focus on the ornamental and content Orientalism of the video clip. I will also consider the extent to which Orientalism can be dangerous if individual stereotypes are described without a proper context.
Vliv politické situace na identitu Rusínů na Slovensku a Ukrajině The / Influence of the Political Situation in Slovakia and Ukraine on the Identity of Rusyns
Authors:   Arcadia University, 450 S. Easton Road, Glenside, Pennsylvania, United States, Kovář Jakub
Published: December 2020

The main topic of this article is the influence of the political situation in Slovakia and Ukraine on the identity of the Rusyn minority. The purpose is to clarify if the political situation in these countries can influence the identity of these people, and how. First, the Rusyn people and their identity, including the factors that are most influential to identity, are discussed. The author focuses on the phenomena such as culture, religion, and Rusyn organizations and their influence on the Rusyn identity. Is it possible that the political situation can somehow influence this identity through these factors? This article compares the past and current situation of the Rusyn minorities in Slovakia and Ukraine, as well as the different situations in both countries to the other. The methods used during the field research in Slovakia, Ukraine and Poland include interviews and the participant observation.
Ecosystem Restoration Policy and Implementation in Production Forest in Indonesia
Authors:   Graduate Program of Forest Management Science, Faculty of Forestry and Environment, IPB University, Academic Ring Road, Campus IPB Dramaga, Bogor, Indonesia 16680, Pareira M H J , Kartodihardjo H , Bahruni Bahruni
Published: December 2020

The issuance of the Ministry of Forestry Regulation (Number SK 159/Menhut-II/2004) on Ecosystem Restoration in Production Forest marked a paradigm shift in production forest management in Indonesia from timber to ecosystem-based. By 2019, the Ministry of Environment and Forestry (MoEF) has issued 16 ecosystem restoration concessions (ERC) in production forest totaling 622,826 ha, or only 21% out of the 3 million ha of MoEF's target. Although this policy was considered a breakthrough and it garnered significant attention, currently, there is no comprehensive assessment on the development of ERC policy and its impacts on achieving MoEF's target. Applied a combination of policy content, process, and implementation analysis, and rational policy analysis, this research examined the gaps in ER policy and implementation and identified policy space to pursue necessary policy improvement. The findings suggested that existing policy remains inadequate to support the implementation of ERC from the licensing process to performance evaluation. This study has identified the need to revise the applicable regulations to facilitate the objectives of ERC management unit, and the objective of ecosystem restoration in the production forest. Revisions include ecological, social, and economic aspects using available policy space that supported by the coalition of actors within the Ecosystem Restoration Working Group.
Another Law in Indonesia: Customary Land Tenure System Coexisting with State Order in Mutis Forest
Authors:   Graduate School of Bioresource and Bioenvironmental Sciences, Kyushu University, 744 Motooka Nishiku Fukuoka, Japan 819-0395, Budiman I , Fujiwara T , Sato N , Pamungkas D
Published: December 2020

Local wisdom has been coexisting with the state system in several places in Indonesia. The Mountain Mutis Nature Reserve in East Nusa Tenggara province is the strict nature reserves, but a customary land tenure system, called suf, exists so far in the nature reserve. The objectives of this study are (1) to organize the historical territorialization process, (2) to clarify the customary land tenure system and activities for livelihoods by local people, and (3) to discuss the challenges of its land tenure system to manage forests sustainably as well as policy methods to harmonize legal pluralism in Mutis Area. Field observation and in-depth interviews with key informants were employed for data collection, and the collected data were analyzed by a qualitative descriptive method. The findings showed the traditional reward and punishment systems regarding extracting non-timber forest products, grazing livestock, and preventing forest fires were working well for sustainable forest management. However, increased pressure on forests due to future population growth appears to have an impact on the traditional system. It also showed the government officers and local people started some discussions to recognize the suf in the formal legal order. However, there were institutional problems to introduce current state systems. Therefore, it is required to flexibly operate or revise the state laws according to the actual situation to harmonize society between state and people.
Optimizing Household Economic Resource to Lessen Population Pressures on Villages around Kerinci Seblat National Park Bengkulu Province
Authors:   Department of Agricultural Socio-Economics, Faculty of Agriculture University of Bengkulu  Jl. W. R. Supratman, Kandang Limun, Muara Bangka Hulu, Bengkulu, Indonesia 38371, Sukiyono K , Widiono S
Published: December 2020

Villages around Kerinci Seblat National Park (Taman Nasional Kerinci Seblat, TNKS) have experienced population pressure. This condition which if not addressed immediately will encourage the community around the TNKS to enter and encroach the forest to meet their household needs. This is getting worse along with the finding that the community around TNKS also does not have many alternative sources of income. For this reason, designing strategies for optimizing household economic to lessen population pressures are noteworthy. Focus group discussion (FGD) and analysis hierarchy process (AHP) was applied to design and to determine development strategy for household economic empowerment and twenty-five key informants including fifteen farmer households were interviewed. The AHP results conclude that the production aspect is the most important that needs to be given priority in the development of plantation production. This conclusion is based on its highest relative priorities (weights), i.e., 0.298. Of the three programs identified and using weight result of AHP, community seed assistance is the most important program in the development of plantation production (weight of 0.494). The seed assistance program is the most important compared to providing soft loans (weight of 0.29) and expanding to production inputs accessibility (weight of 0.216). Meanwhile, human resource development aspects are the most attractive strategy for food crop production development, especially rice, with a weight of 0.325. Aspects of human resource development are more focused on improving farmer knowledge in cultivation than marketing and post-harvest handling aspects. Optimization of pekarangan resources is directed to the development of the chicken farm (weight = 0.274) focused on improving the production aspect (weight = 0.328). Among three priority programs, day-old chicken assistance (weight = 0.512) is more needed than access to soft loans (weight = 0.242) and feed programs (weight = 0.246).
Diversity of Amphibians and Reptiles in Various Anthropogenic Disturbance Habitats in Nantu Forest, Sulawesi, Indonesia
Authors:   Department of Forest Resources Conservation and Ecotourism, Faculty of Forestry and Environment, IPB University, Academic Ring Road, Campus IPB Dramaga, Bogor, Indonesia 16680, Kusrini M D , Khairunnisa L R , Nusantara A , Kartono A P , Prasetyo L B , Ayuningrum N T , Faz F H
Published: December 2020

The Nantu Forest in Gorontalo Province, Sulawesi, Indonesia holds one of the few remaining pristine habitats in the island. The reserve is surrounded by human habituation which provide opportunity to study the impact of forest lost on biodversity. In addition, data on Nantu mostly focused on big mammals, as there is no previous herpetofauna survey at the area. Sampling of amphibian and reptile was conducted in June 2013 and in May–June 2014 using Visual Encounter Survey method, glue traps and transect sampling in seven different sites at the eastern part of Nantu. We categorized four habitat types based on human disturbances: high disturbed habitat (HDH), moderate disturbed habitat (MDH), low disturbed habitat (LDH) and pristine habitat (PH). A total of 680 individual amphibians (4 families; 17 species) and 119 individual reptiles (9 families; 29 species) were recorded. Species richness and species composition for amphibians and reptiles differs according to the level of human disturbances. Low level disturbances habitat demonstrated the highest diversity of amphibians and reptiles, whereas as expected, high distubed habitat showed the lowest diversity. Anthropogenic pressures in forest will decrease species richness of amphibian and reptiles. Although most amphibian and reptiles will be able to persist in low disturbances habitat, forest-dependent species will be lost when pristine forests are disturbed.
Conservation of Damar Mata Kucing (Shorea javanica): A Review on the Aspect of Trade System
Authors:   1Graduate Program of Tropical Biodiversity Conservation, Faculty of Forestry and Environment, IPB University, Academic Ring Road, Campus IPB Dramaga, Bogor, Indonesia 16680, Nur'aini H
Published: December 2020

Damar mata kucing (Shorea javanica) is one of the non-timber forest products (NTFP)s that has been widely managed and utilized by local people around the Pesisir Barat Lampung Province. The majority of repong damar has been cut down, especially during the last 15 years. One of the reasons for decreasing community interest in managing repong dammar is the decreasing of dammar gum prices. This research aimed to analyze the market system of dammar cultivation in Pesisir Barat, Lampung Province. Descriptive analysis was used to determine the local community's knowledge, skill, and opinion in the trading channel. For further analysis, marketing margin and farmers' share were also used to analyze the price differentiation from the producer's level to the consumer's level. Based on the study results, there are three channels of the dammar gum market in Pesisir Barat Lampung. Most of the farmers (up to 85.71% of total) in Pekon Pahmungan use trading channels 1 and 2 to sell their harvested dammar. Meanwhile, based on the analysis of profit margin, it appears that farmers in channels 1 and 2 are trading actors that receive the lowest profit margin (IDR7,100 kg-1 and IDR8,100 kg-1) compared to trading channel 3 (IDR14,000 kg-1). Farmer's share obtained by dammar farmers in this study was 55.30% on channel 1, 52.20% on channel 2, and 76.80% on channel 3. Livelihood, limitation on capital, lack of information and networking, knowledge and abilities to tree management and harvested dammar, knowledge of another use of dammar gum, and the ability to use technology directly affecting farmers' position in the dammar gum trading system.
Improved meshless local Petrov-Galerkin method for two-dimensional potential problems
Authors: Zheng Bao-Jing  , Dai Bao-Dong  ,   Department of Engineering Mechanics, Taiyuan University of Science and Technology, Taiyuan 030024, china
Published: December 2020

In this paper, combining the moving Kriging interpolation method and meshless local Petrov-Galerkin method, an improved meshless local Petrov-Galerkin method is presented, in which the Heaviside step function is used as test function over the local weak form. The present method is applied to two-dimensional potential problems and the corresponding discrete equations are derived. Because the shape functions so-obtained possess the Kronecker delta property, the essential boundary conditions can be enforced as the FEM; furthermore, the Heaviside step function is used as the test function, there is no domain integral, and only a regular boundary integral is involved. In this paper, the choice of the important parameters is studied. Numerical examples show that the present method has simpler numerical procedures and lower computation cost, in addition, the essential boundary conditions can be implemented directly.
An analytical solution for opening-up vesicle based on the circular biconcave shape
Authors: Li Shu-Ling  , Zhang Shao-Guang  ,   College of Physics and Information Technology, Shaanxi Normal University, Xi'an 710062, China
Published: December 2020

The numerical and the analytical studies of the opening-up vesicles have become hot topics since the experimental observation by A. Saitoh et al. This paper deals with how to obtain the analytical solution of an opening-up shape from the Ouyang biconcave analytical solution. We find only two of the three boundary conditions for the vesicle rims to be independent. The second boundary condition can be satisfied by the Gaussian bending modulus kg=-2, then we obtain the geometric equation for the rims of an opening-up vesicle from the first boundary condition. By analyzing the Ouyang analytic solutions for a closed circular biconcave vesicle and periodic noduloidlike vesicle, we obtain three kinds of shapes with tube topology, which are the convex tube, the toruslike tube, and the catenoidlike tube.
Radiation powers of magnetic dipole and electric quadrupole in magnetic anisotropic medium
Authors: Hong Qing-Quan  , Yu Yan-Zhong  , Cai Zhi-Shan  , Chen Mu-Sheng  , Lin Shun-Da  ,   School of physics and information engineering, Quanzhou Normal University, Quanzhou 362000,China
Published: December 2020

Under the frame of classical electrodynamics, the electromagnetic radiation in magnetic anisotropic medium is investigated in this paper. The radiation power expressions for magnetic dipole and electronic quadrupole in magnetic anisotropic medium are in derived. Furthermore, the results, which are achieved by inserting the μr in isotropic medium into the obtained expressions, are agreed with the references. And the correctness of the obtained expressions is verified. The research results demonstrate that the radiation powers of magnetic dipole and electronic quadrupole are related to the μr in magnetic anisotropic medium. This conclusion is very helpful for determining the radiation effects of magnetic dipole and electronic quadrupole in magnetic anisotropic medium.
Dynamical entanglement of vibrations in the linear triatomic molecule by the algebraic approach
Authors: Feng Hai-Ran  , Li Peng  , Zheng Yu-Jun  , Ding Shi-Liang  ,   (1)Department of Physics and Information Engineering, Jining University, Jining 273155, China; (2)Department of Physics, Shandong University, Jinan 250100, China
Published: December 2020

In this paper the dynamical entanglements of anharmonic vibrations in the linear triatomic molecules are researched by the Lie algebraic approach. The linear entropy and the Von Neumann entropy are analytically obtained for both initial Fock states and coherent states. The dynamical properties of entanglement in molecules HCN and DCN are discussed.
Effect of non-standard interaction on Daya Bay experiment
Authors: Lu Gong-Ru  , Feng Lei  , Yang Jin-Min  ,   (1)College of Physics and Information Engineering, Henan Normal University, Xinxiang 453007, China; (2)Key Laboratory of Frontiers in Theoretical Physics, Institute of Theoretical Physics, Academia Sinica, Beijing 100190, China
Published: December 2020

The goal of the Daya Bay reactor experiment is to determine unknown neutrino mixing angle θ13. The non-standard interactions (NSIs) of the neutrinos will affect the neutrino oscillation probability. In this paper we check the Daya Bay experimental sensitivity to θ13 in the presence of NSIs. Clearly, in this single experiment the values of θ13 and NSIs cannot be determined. The experimental observation of neutrino oscillation indicates a non-zero θ13. But if we do not observe the neutrino oscillation, it will not be meant that the value of θ13 must be zero.
Valid gain range of space for atom laser
Authors: Yuan Du-Qi  ,   Department of Physics and Information Technology, Baoji University of Sciences and Arts, Baoji 721007, China
Published: December 2020

The density of states for an ideal Bose gas in a γ-dimensional potential is obtained. Morever, the spatial distribution of particle numerical density is derived in the Thomas-Fermi semiclassical approximation. On this basis, the valid gain range of space for atom laser (that is the valid trapped range of ideal Bose gas in γ-dimensional potential) is given, and the influence of some important factors is also discussed.
Digital secure communication scheme based on improved cellular automata
Authors: Zhang Xu  , Ren Wei  , Tang Dong-Ni  , Tang Guo-Ning  ,   College of Physics and Technology,Guangxi Normal University,Guilin 541004,China
Published: December 2020

In order to enhance the encryption speed and secrecy of the current chaotic secure communication system,a scheme of digital secure communication based on the stream cipher produced by real-time synchronization is presented. A improved cellular automata is used for encryption in the secure communication scheme while the expanded key technology and confusion technology are adopted. Numerical results show that the secure communication scheme can produce good pseudo-randomness stream ciphers while it has very fast speeds of encryption and decryption and high anti-attack ability.
Stabilization of chaotic behaviour and spiking current in thyristor with time-delayed feedback control
Authors: Tan Ping-An  , Zhang Bo  , Qiu Dong-Yuan  ,   College of Electric Power,South China University of Technology,Guangzhou 510640,China
Published: December 2020

A new method is proposed for the stabilization of spatio temporal chaos in a thyristor device. The valid control of unstable periodic orbits (UPOs) of the chaotic system is achieved by combining time-delayed feedback control (TDFC) with the use of phase space compression. Based on the stability theory of linear periodic system,the linear stability analysis of the controlled system is discussed by using the Floquets theorem,and the feedback gain of TDFC was optimized through the Floquet exponents. The results show that the spatio temporally unstable periodic orbits embedded in a chaotic attractor of the spatially extended system can be stabilized by using the proposed method,and the spiking current filaments can also be inhibited well.
Transitions of different rhythm patterns of neuronal firing activity
Authors: Yang Zhuo-Qin  ,   Shcool of Mathematics and System Sciences and Key Laboratory of Mathematics and Behavioral Semantics,Beihang University,Beijing 100083,China
Published: December 2020

Transitions of different neuronal firing patterns in the Chay model are explored by numerical simulation of three firing sequences observed in experiments on neural pacemakers, and the bifurcation analysis of limit cycle. Firstly,the transitions of periodic firing patterns through a pair of period-doubling bifurcations are obtained. Secondly,a supercritical and a subcritical period-doubling bursting sequences with different appearances lead to chaos,and then transit to an inverse period-doubling spiking sequence in different ways,separately. Finally,we reveal the true nature of period-adding bursting sequence without chaotic bursting,which is closely related to period-doubling bifurcation.
Study on traffic flow affected by the road turning
Authors: Xue Yu  , Liang Yu-Juan  ,   (1)Department of Physics and Electronics Engineering,Hechi University,Yizhou 546300,China; (2)Institute of Physical Science and Engineering,Guangxi University,Nanning 530004,China
Published: December 2020

Base on the NaSch model, an improved single-lane cellular automaton traffic flow model for especial road is proposed via considering effects of curvature radii, arc length and friction factor on the vehicle movement. By numerical simulation for the traffic flow with different curvature radii, arc length and friction factor, it is found that our improved model can reflect accurately the influence of special sections of a road on the running vehicles, meanwhile visualize the complex nonlinear phenomenon traffic waves of alternate running and stopping as in actual traffics. The reflecting phenomenon in actual traffics indicates that traffic accidents and congestion can be avoided by increase the curvature radii, friction factor of road turning, the capacity of road can be enhanced also.
BiMnO3 nanopowders synthesized at low temperature and low pressure nanoparticles and their physical properties
Authors: Yao Chang-Da  , Gong Jiang-Feng  , Geng Fang-Fang  , Gao Hong  , Xu Yun-Ling  , Zhang Ai-Mei  , Tang Chun-Mei  , Zhu Wei-Hua  ,   (1)Collage of Physics Hehai University,Nanjing 210098,China; (2)Collage of Physics Hehai University,Nanjing 210098,China; National Laboratory of Solid State Microstructures Nanjing University,Nanjing 210093,China
Published: December 2020

Perovskite-type BiMnO3, in which ferroelectricity and ferromagnetism co-exist,has potential applications in sensor and information storage. Usually, BiMnO3 is synthesized under high temperature and high pressure in a gold capsule,which restricts its application and development extremely. In this paper, we synthesize the BiMnO3 nanopowders with MnCl2·4H2O,Bi2O3, NaOH,HNO3 and polyglycol at 100 ℃ by the co-precipitation method successfully, in which the conditions of temperature and pressure are reduced, thereby economizing the energy sources and lowering the cost. Their microstructure and magnetic properties are measured by using X-ray diffraction (XRD), transmission electron microscope(TEM) and vibration sample magnetometer(VSM). The effects of synthetical condition and the calcined temperature are also discussed.
Analysis of single photon detector based on the reflection of coaxial cables
Authors: Cheng Nan  , Huang Gang-Feng  , Wang Jin-Dong  , Wei Zheng-Jun  , Guo Jian-Ping  , Liao Chang-Jun  , Liu Song-Hao  ,   Laboratory of Photonic Information Technology,School for Information and Optoelectronic Science and Engineering,South China Normal University,Guangzhou 510631,China
Published: December 2020

In this paper are analyzed the characteristics of the single photon detector (SPD) with using coaxial cables as reflection lines to cancel transient spikes noises, particularly,the characteristics of variations in bias voltage of the avalanche photodiode (APD) and output signal. Based on the theoretical analyses,the principle of the timing relation between single photon pulses and the two gate pluses is discussed. Also, the condition and the effect of transient spikes cancellation are achieved. And the minimal detecting period is obtained. Finally,we conduct some experiments to verify our theory. In our experiment,the noise rejection ratio is 25.1dB. The results accord with our theory satisfactorily. Our results will be helpful in designing and optimizing single photon detectors.
A method of estimating residence time of atmospheric aerosol and its preliminary experimental verification
Authors: Liu Wei  , Lin Jun  , Xiao De-Tao  , Wei Nan-Nan  , Zhou Qing-Zhi  , Wang Guang-Hua  , Shan Jian  ,   (1)Shanghai Institute of Applied Physics; Chinese Academy of Sciences,Shanghai 201800,China; (2)Shool of Nuclear Science and Technology,University of South China,Hengyang 421001,China
Published: December 2020

A method of estimating residence time of atmospheric aerosol (RTAA) is established based on the relationship between specific activity ratio of radon daughters in atmospheric particles and average life of the particles. The method is further testified in a standard radon chamber. When specific activity of radon is 1.816 kBq/m3 in the chamber,the RTAA is estimated to be 112.17 min,which is in agreement with the mean-ventilation time in the chamber,104.17 min. Therefore,the residence time of the atmospheric aerosol can be estimated by using the specific activity ratios of radionuclide in the same decay chain,such as 214Bi/214Pb, 210Bi/210Pb and 210Po/210Pb.
Analysis on high frequency performance of THz GaAs Schottky mixer diode
Authors: Fan Guo-Li  , Jiang Yue-Song  , Liu Li  , Li Fang  ,   School of Electronic and Information Engineering,BeiHang University,Beijing 100191,China
Published: December 2020

In the THz frequency range,several new high effects will restrict diode high-frequency performance. With the thermionic emission theory and the tunnel theory,the high-frequency performance of epitaxial Schottky diodes is re-evaluated and the structure parameters are optimized with using the cut-off frequency as a figure of merit. The results show that when the operation frequency is higher than the plasma frequency,the diode is equivalent to a capacitance with losing the frequency mixing performance. With the increase of frequency,increasing the doping density of substrate can reduce the substrate plasma resonance effect. The plasma resonance frequency of epitaxial layer is an important factor but transit time effect must be considered. The higher operation frequency can be obtained through reducing the anode diameter and the epilayer thickness,and increasing the epilayer doping density. The results have an important reference value in developing the room temperature THz mixing diodes.
A novel method to realize the nanometer scale grid deposition
Authors: Zhang Wen-Tao  , Zhu Bao-Hua  ,   School of Electronic Engineering, Guilin University of Electronic Technology, Guilin 541004, China
Published: December 2020

The technology of laser-focused atomic deposition can be used to develop the nanostructure transfer standard of length. In this paper, a novel method is used to fabricate the nanometer structure through chromium atomic deposition. By the designed pre-collimated hole with three apertures, the chromium atomic beam may be divided into three parts. The middle part is for the atom beam to react with the standing wave and the deposition on the substrate with periodic distribution and the other two parts which can not be blocked by the substrate are for the atom beam to react with the detecting laser beam, and can be used to inspect the characteristic of atomic beam. This can provide some guidance for the progress of deposition. The simulatiion results show that the full width of half maximum is 6.2 nm and the contrast is 28:1 by using this special pre-collimated hole. On the other hand, the full width of half maximum and contrast are 32 nm and 8∶1 without using this special hole.
Study on the method and experiment of time-resolved coherent anti-Stokes Raman scattering using supercontinuum excitation
Authors: Yu Ling-Yao  , Yin Jun  , Wan Hui  , Liu Xing  , Qu Jun-Le  , Niu Han-Ben  , Lin Zi-Yang  ,   (1)Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province, College of Optoelectronic Engineering, Shenzhen University, Shenzhen 518060, China; (2)Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province, College of Optoelectronic Engineering, Shenzhen University, Shenzhen 518060, China; College of Optoelectronic Science and Engineering, Huazhong Universit
Published: December 2020

In this paper, we present the development and experimental results of a time-resolved coherent anti-Stokes Raman scattering (CARS) experiment setup that is based on supercontinuum excitation and precise time-delay control. The output of a Ti-sapphire femtosecond laser is divided into two parts. One part is used to pump a photonic crystal fiber (PCF) to generate supercontinuum spectrum which is used as pump and stokes beams. The other part of the femtosecond laser is used as the probe light. Dimethyl sulfoxid, a sample with broad range of Raman spectrum was tested. Experimental results show that this system can inhibit the non-resonant background noise effectively and obtain CARS spectrum of dimethyl sulfoxide in the frequency range of 690—3200 cm-1 in one measurement, which means that spectrum range of the acquired CARS spectrum of dimethyl sulfoxide is 2500 cm-1. We also present experimental results of supercontinuum generation using a PCF.
Research on improve the SNR of ultracold cesium molecule rovibronic spectrum via best optimization parameter control
Authors: Zhang Yi-Chi  , Wu Ji-Zhou  , Ma Jie  , Zhao Yan-Ting  , Wang Li-Rong  , Xiao Lian-Tuan  , Jia Suo-Tang  ,   State Key Laboratory of Quantum Optics and Quantum Optics Devices, College of Physics and Electronics Engineering, Shanxi University, Taiyuan 030006,China
Published: December 2020

Ultracold atom photoassociation spectroscopy is significant for studying the long-range molecular potential energy structure. The signal-noise ratio of ultracold Cesium Molecule photoassociation Rovibronic Spectrum is one of the indicators as a measure of detection technology which directly affect the distinguishing ability and detection sensitivity of the spectra. We obtain an long-range ultracold cesium molecular hyperfine rovibration spectra by modulating the fluorescence spectroscopy. We find that demodulation parameters have a significant impact to the signal-noise ratio of spectra by studying the demodulation parameters such as integration time and sensitivity, which show nonlinear relation with the ratio. We achieve the optimal control of the signal-noise ratio for spectrum according to our experiment, which laid an important foundation for further studying the long-range state rovibration level of ultracold cesium molecule.
The theory study of electronic structures and spectram properties of WnNim(n+m≤7; m=1, 2) clusters
Authors: Tang Hui-Shuai  , Zhang Xiu-Rong  , Gao Cong-Hua  , Wu Li-Qing  ,   (1)Research Institute of Higher Education, Jiangsu University of Science and Technology, Zhenjiang 212003,China; (2)School of Materials Science and Engineering, Jiangsu University of Science and Technology;Zhenjiang 212003,China
Published: December 2020

Possible geometrical structures of WnNim (n+m≤7; m=1, 2) clusters have been optimized by using the density functional theory (B3PW91) at the LANL2DZ level. For the ground state structures, the NBO,vibration frequencies, spectrum and polarizability are studied. The calculated results show: the hybrid phenomenon is very strong within W and Ni atoms, while weak in the W-Ni atoms. In the process of forming alloy clusters, the charge transfer happens owing to the interaction of W and Ni so that most of Ni atom is positive and while W atom is negative. The optical properties indicated, the number of the vibrational peak is the most in the IR and Raman of W6Ni cluster, the IR and raman absorption peak of W5Ni2 is the strongest and the IR absorption peak of W2Ni has only one; the bonding between atoms shows stronger with the increasing of W content in the WnNim (n+m≤7; m=1, 2) clusters.
Backward-wave oscillation in high power broadband helical traveling wave tube
Authors: Hu Yu-Lu  , Yang Zhong-Hai  , Li Bin  , Li Jian-Qing  , Huang Tao  , Jin Xiao-Lin  , Zhu Xiao-Fang  , Liang Xian-Pu  ,   Vacuum Electronics National Laboratory, University of Electronic Scieuce and Technology of China,Chengdu 610054, China
Published: December 2020

A 2D nonlinear beam-wave interaction is built to simulate the backward-wave oscillation(BWO) in a Helical traveling wave tube, based on the 1D beam-wave interaction model by taking into account the angular speed which is affected by magnetic field. The normalized oscillation start-up length with different space charge parameter is compared with that obtained from a equivalent circuit model in small signal, showing that they are close to each other. Also, the simulated results are in accordance with the measurements in a 8—18 GHz Helical TWT. The factors affecting the BWO are studied, by which some methods to suppress the BWO are improved.
Octagonal split resonant rings composite metal-wires to realize negative refraction
Authors: Sun Ming-Zhao  , Zhang Chun-Min  , Sun Xiao-Ping  ,   Non-equilibrium Condensed Matter and Quantum Engineering Laboratory of the Key Laboratory of Ministry of Education;School of Science , Xi'an Jiaotong University, Xi'an 710049 , China
Published: December 2020

Traditional C-shaped split resonant ring(SRR) composite metal wire periodic structure is studied through simulation and experiment. Comparing the simulation result of negative permeability material based on periodic structure of octagonal SRR with that of closed split resonant rings (CSRRs), we ind that octagonal SRRs can produce negative permeability. A new kind of left-handed material combined with octagonal resonators and copper wires is de signed, and the simulation result shows that the structure has good left-hand property in a certain frequency band. Experimental samples of two different sizes are fabricated, in which negative refraction happens in ranges of 9.8—15 GHz and 9.5—15 GHz separately: small size sample has more broad negative band but lower transmission rate.By comparison with the experiment result of C-shaped sample we ind that the octagonal SRR hasa high transmission rate , but energy transmitting through new designed structure shows a more proportion in negative field, which demonstrates better negative behavior. This has important significance on design and study on new periodic structures of left-handed materials.
Imaging electron-optics and spatial-temporal aberrations for a bi-electrode spherical concentric system with electrostatic focusing
Authors: Zhang Zhi-Quan  , Zhang Yi-Fei  , Zhou Li-Wei  , Gong Hui  ,   (1)Department of Control Enginering, Institute of Armored Force Engineering, Beijing 100072, China; (2)School of Photonics, Beijing Institute of Technology, Beijing 100081,China
Published: December 2020

In the present paper, based on the practical electron ray equation and the electron motion equation,for a bi-electrode concentric spherical system with electrostatic focusing, the spatial-temporal trajectories of moving electrons emitted from the photocathode are obtained, the exact and the approximate formulae for image position and flight time of electrons are deduced. Starting from the solutions of spatial-temporal trajectories, the electron optical spatial-temporal properties of this system are then discussed. A unified definition of spatial-temporal aberrations is given, in which the lateral aberration can be regarded as a combination of paraxial lateral aberration and geometrical lateral aberration; and the temporal aberration can be regarded as a comibination of paraxial temporal aberration and geometrical temporal aberration. All expressions of these corresponding aberrations are deduced.
Propagation of the electromagnetic field in anisotropic relief gratings
Authors: Tang Shi-Hong  , Li Jian-Long  , Fu Ke-Xiang  , Zhu Shi-Fu  ,   (1)College of physics science and technology,Sichuan University, Chengdu 610064, China; (2)Department of materials science, Sichuan University, Chengdu 610064,China
Published: December 2020

The propagation of the electromagnetic field in anisotropic relief gratings has been analysis, and the recursive algorithm of RTRA has been extended to the anisotropic medium in this paper. The numerical calculation shows that the space distribution of the electromagnetic field in each sub-micro-layer changes with the varying transmission depth in the relief grating, the space distribution in each sub-micro-layer is more uniformed than that in isotropic grating and the optical parameters of the anisotropic relief grating and the incident beam have a large impact on the space distribution of the electromagnetic field in relief grating and so on.