bluuebunny/crossref_metadata_2025 huggingface dataset:
Study on system construction of integrating moral education into college English teaching
Authors: Yang Chunye , Xu Defeng
Published: May 2023

College English, as a general education curriculum with huge amounts of audiences, is the main filed to put moral education into practice. This paper, aiming to provide theoretical framework and practice guidance, focuses mainly on system construction of integrating moral education into college English. The paper, firstly illustrates the chronological development of moral education in China, followed by the literature review at home and abroad. Lastly, a hypothesis of top-level design from a macroscopic perspective and a teaching model from a microcosmic perspective are proposed, which form an integration with open access to adjusting according to practical situations of different universities, leading to diversification and specialization of the system of moral education in the “New Art” Era.
Research on the emergence mechanism of shared leadership: The mediating role of self-efficacy
Authors: Jiang Yiqing
Published: May 2023

Current academic research on shared leadership has focused on the impact of shared leadership, with relatively little research on its causes and operational mechanisms. To fill this gap, this paper identifies, analyzes, and tests the emergent mechanisms of shared leadership. Firstly, by defining the concept, I constructed a theoretical model of the study based on theories such as social exchange. Secondly, I used SPSS 25.0 and AMOS 24.0 software to analyze the 227 valid questionnaires collected. The results show that team member exchange has a significant positive impact on the emergence of shared leadership, and self-efficacy plays a positive mediating role.
“New Singing of Ancient Poems” in music education of primary and secondary schools
Authors: Li Nan , Xian Yingying
Published: May 2023

“The new singing of ancient poetry” refers to a musical innovation form that takes the ancient poetry culture as the source of lyrics and rearranges the melody with modern music style and lasting appeal. It makes ancient poetry discourse from the perspective of music and breaks the barriers to understanding the ancient poetry culture. In recent years, Chinese ancient poetry has attracted more and more people's attention and love because of its unique value of recreation in music, and has become an important source of poetry and music. Through the discussion of the form of “new singing of ancient poetry”, this paper hopes to arouse some music educators in primary and secondary schools to pay attention to how to guide students to learn the music culture of ancient poetry, so that the traditional culture of ancient poetry can play its charm in music education of primary and secondary schools.
Design of ideological and political teaching case of analytical chemistry based on EDTA Titrator
Authors: Niu Jinfen , Lu Leilei , Yu Xiaojiao , Zhao Ningning , Chang Zheng
Published: May 2023

Under the background of ideological and political education in the curriculum, according to the requirements of talent training in applied universities, the authors take the analytical chemistry curriculum as the implementation carrier of ideological and political education. Taking case teaching as an innovative means, a teaching case with EDTA as coordination titrant was designed. Based on the explanation of the principle that metal ions and coordination atoms coordinate to form stable compounds in Lewis acid-base theory, the ideological and political education was effectively combined with the teaching point of analytical chemistry knowledge, and the reason why EDTA had wide adaptability was proposed. From the perspective of ideological and political education, the teaching designs carried out with values education as the main line. The curriculum not only imparted professional knowledge, but also guided students' values. A reasonable teaching design can realize the educational goal of the same frequency resonance between professional courses and ideological and political education.
The evolution of a symbiotic ecosystem of Chinese e-commerce retail logistics in the post-COVID-19 epidemic era
Authors: Zhao Dan , Smirnova Elena Aleksandrovna
Published: May 2023

Since February 2020, the COVID-19 pandemic has spread across the world, greatly affecting the global economic situation and peoples lifestyles. Mass consumption has shifted from offline to online, suggesting a permanent trend and making e-commerce one of the few industries to go against the global trend of economic downturn. With a continuous increase in online consumption, the supporting logistics ecosystem has also evolved. By analyzing and comparing the development status of e-commerce logistics industries before and after the initial impact of COVID-19, this paper finds that after the initial impact of COVID-19, China's e-commerce logistics ecosystems are more stable, and an e-commerce logistics ecosystem in China, consisting of a guiding layer, a backbone layer, a filling layer, a basic layer and a bearing layer, has taken shape, providing strong support for the continued development of e-commerce in China.
Research on randomcity of conflict events in construction engineering projects
Authors: Liu Xiaohong , Hou Yiru , Wang Yi , Hou Xueliang
Published: May 2023

The conflict events that occurred in construction engineering projects (CEP) often bring about many adverse effects on project implementation and show a character of randomcity. To find out the occurring rule of conflict events, all sorts and occurring frequencies of conflict events in CEP are analyzed based on the investigation. The representing rule of conflict events in every stage has been revealed in a new concept referred to as the representation degree by the method of quantitative analysis combined with qualitative analysis. Then, according to the basic principle of the analytic hierarchy process, every stage’s judgment matrixes of conflict events are set up. Latent roots of these matrixes have revealed the influence order of cumulative results of conflict events at each stage. The harvest has obvious theoretical and practical value for forecasting conflict events, mastering the whole project situation, avoiding and reducing conflict events, and improving project management ability.
Exploration and practice of practical teaching of automobile inspection and maintenance major in higher vocational education under the background of “Three Education” reform
Authors: Zhu Chunhong , Song Jiantong , Fu Yiwei , Sui Meili
Published: May 2023

The “three education” reform was explicitly proposed in the National Vocational Education Reform Implementation Plan in January 2019, that is, the reform of teachers, teaching materials and teaching methods, which runs through the whole process of talent training, directly related to the fundamental issue of “who, how and for whom to train people”, and is the top priority of the development of higher vocational education in the new era. The biggest difference between higher vocational colleges and undergraduate colleges is to cultivate high-end skilled talents. The cultivation of skilled talents cannot be separated from practical teaching. Taking the automobile inspection and maintenance specialty in higher vocational colleges as an example, this paper analyzes the role and importance of each practical teaching link in cultivating students’ skills and other qualities.
Research on talent cultivation of software engineering under the background of integration of industry and education
Authors: Jiang Cuiyuan
Published: May 2023

With the rapid development of information technology, The Internet, Cloud Computing, Big Data Etc. Various emerging scientific and technological means and thinking modes are quietly and profoundly changing the thinking, production and learning methods of human society. At present, the education industry generally regards the integration of production and education as the path of vocational education development and personnel training, This paper discusses the current situation of the integration of industry and education, Analyze the problems in the process of the integration of industry and education, The talent cultivation scheme of software engineering under the background of integration of industry and education is proposed.
Design of MTI graduation examination syllabus and test paper
Authors: Liu Shan
Published: May 2023

At present, there is not any MTI graduation test system in China, although the enrollment of MTI students witnesses an increase. This paper presents MTI graduation written test construct and design of syllabus. It then elaborates on the test construct, modules, which is intended to clarify the purpose, significance and contents of MTI graduation test and shed new light on future large-scale test development and improvement of cultivation quality of MTI graduates.
Courses reform of mould courses based on field augmented reality facing engineering education certification
Authors: Zhang Hui , Chen Yao , Che Weiming , Guan Zhen , Zhu Xiaoyang , Zhu Chengshun
Published: May 2023

Mould courses are crucial components of the mechanical manufacturing course system, and their innovation and reform can inspire new approaches to college education reform, as for the engineering education certification process. The augmented reality mould disassembly and assembly teaching scheme that is proposed in this paper can help students master the structure and processing of complicated moulds, and thus make comprehensive use of the relating learning knowledge and skills. By understanding of the typical structural design and assembly of moulds, students can learn actively by interaction of the three teaching strands of instruction, case study, and assessment. This will raise the level of instruction throughout the courses as well as student participation and interest. The proposed AR auxiliary system is a new approach to essentially foster students’ capacity for independent learning, knowledge understanding, and innovation and production in the age of digital learning and engineering education certification.
Teaching reform of “production planning and control” for modern manufacturing industry
Authors: Hou Jun , Li Feng , Zhou HuiHui , Yang Hairu
Published: May 2023

"Production Planning and Control" is one of the major courses in Industrial Engineering, and its cross-cutting, adaptable, and practical characteristics require that the course should well integrate technology and management to meet the evolution of modern manufacturing industry. Through the study of the traditional teaching effectiveness of "Production Planning and Control", this paper pointed out the issues, including insufficient interaction, unappealing content, and lack of systematization of the knowledge. By introducing teaching reform approaches for the course, it proposes to combine various teaching methods, rearrange the teaching material, systematically plan the practical teaching links, and assess the learning effect through a diversified evaluation system, in order to promote students' motivation and learning enthusiasm, meanwhile improve the teaching effect of the course to meet the requirement of modern manufacturing industry for talents.
Exploring the innovation of Chinese cultural education practice from the perspective of inter-subjectivity theory
Authors: Chen Xuling
Published: May 2023

The theory of inter-subjectivity, which emphasizes the sharing of equal subjects through communication and interaction, contains a rich educational philosophy. The theory of inter-subjectivity guides the innovation and reform of Chinese cultural education practice, which is an important initiative to enhance students' sense of Chinese cultural identity and contains the logic of theory, action and thought. In the face of the practical difficulties of Chinese cultural education practice in universities, on the one hand, we can promote the intercultural communication of educational subjects by creating cultural environment and improving educational management. On the other hand, we can explore the intercultural common ground of educational subjects by designing practical activities and focusing on cultural knowledge to promote the high-quality development of Chinese cultural education reform in the new era.
Analysis of a hazardous factory explosion accident
Authors: Guo Shihui , Wang Zhiming , Cui Kunpeng , Xiao Chuan
Published: May 2023

Factory explosion accidents not only cause damages of factory facilities and equipment, or casualties usually, but also cause fire disaster due to various reasons, resulting in larger losses. After the occurrence of accidents, timely, accurate, and efficient response is an urgent need to protect the safety of people's lives and property. A hazardous Factory Explosion accident in North China in 2019 was taken as an example by this paper. It conducts research from four aspects, including the basic situation of the accident, the handling of the explosion accident, and the analysis of the cause of explosion accident. The useful advice and efficient disposal methods of accidents, the enhancement of disaster prevention and disaster relief capabilities, and the formation of a long-term mechanism to ensure the safety of people’s lives and property are expounded in this paper, in order to provide a reference for similar accident management.
Design of power control system for student dormitory
Authors: Liu Chunyan , Wang Shujiao , Sun Yanshan
Published: May 2023

This design is based on the residential building of boarding school as the research object. The STC89C52RC single-chip microcomputer is used as the main control chip, and the clock chip, temperature chip, smoke collection module, A/D conversion, LED digital tube display circuit, matrix keyboard, infrared wireless remote control and other controllers are used to control the power system and adjust the access control system. This system is applicable to all kinds of colleges and universities that have strict management on students' electricity consumption. It can automatically control the electricity consumption of students' dormitories according to the school management regulations, and can automatically make emergency response to emergencies such as fire.
Research of virtualized log management system in communication dispatching center of power grid
Authors: Ling Jianwen , Luo Yafei
Published: May 2023

Logs happen every day. They record all kinds of events of current network and its management facilities. Communication dispatchers can use it to aware network or facility failures. In the purpose of improving awareness of communication network and its management facilities, this research is focusing on a log management system for different types of communication devices and network management servers. From log system architecture, to actual situations of log collection. Then, the distribution of system, from bare-metal servers to virtual machines. Most a virtualized log management system is deployed and tested in a dispatching center of power grid.
Design and implementation of automatic sorting car based on OpenMV
Authors: Zhu Lin , Yang Yan
Published: May 2023

The system uses the OpenMV algorithm module combined with the k-means framework through the Euclidean distance formula to facilitate the automation of logistics sorting, which identifies the color of logistics parcels in the LAB color space. It sends the identified color information to the motion drive module, which sorts and transports the logistics parcels to the designated storage area. The fusion of algorithms allows the system to identify colors and transportation accurately.
Pattern segmentation based on PoolNet and boundary connectivity
Authors: Gu Xiaohong , Shang Shuyuan
Published: May 2023

Traditional image segmentation algorithms need to design features manually. Therefore, based on the advantage of PoolNet in object detection, this paper proposes a clothing pattern segmentation algorithm combining PoolNet detection and boundary connectivity. This algorithm has more fine edges than traditional segmentation. Especially in the case of similar background before and after, we can get more complete pattern elements, and have better results in segmentation accuracy.
A review of automatic coal volume measuring technologies
Authors: Li Dou , Luo Haoxuan , Wang Lin , Gao Jin , Cheng Li
Published: May 2023

In coal-fired power plants, how to timely inventory coal storage, in order to optimize the coal stock, and improve coal blending operation, and then carry out economic dispatch scientifically and reasonably, has always been an important topic. The traditional way of artificial method has big error, high cost and serious waste of resources. Ultrasonic measurement technology is greatly affected by time difference and dust. Measurement technology based on computer vision requires interpolation to fit the correction model. The above methods all have large measurement errors and have been eliminated by the market. This paper mainly introduces coal measuring technologies based on laser and uav tilt photography which have been researched and applied more recently. Their respective installation methods, characteristics and applicable working occasions are analyzed. They have the common characteristic that the 3d coordinate point cloud data of coal yard surface needs to be solved before the 3d model of coal yard can be generated and the coal storage amount can be calculated. In the case that the 3d coordinate point cloud data of coal yard of power plant cannot be obtained directly, 3d reconstruction can be carried out by using 2d images of coal yard in coal report, or by using neural network model, and then the coal volume can be checked. This research idea is of great significance to realize effective and accurate supervision of coal storage in power plants..
A flexible ensemble regression model of extreme learning machine for missing value imputation of DNA microarray data
Authors: Pan Xiuwei , Dong Wenlu , Yu Hualong
Published: May 2023

Missing value imputation (MVI) is important for DNA microarray data analysis because microarray data with missing values would significantly degrade the performance of the downstream analysis. Although there have been lots of MVI algorithms for dealing with the missing DNA microarray data, we note that most of them have a lack of robustness owing to only adopting the single model. In this paper, a flexible and robust MVI algorithm named EELMimpute is proposed to address missing DNA microarray data imputation problem. First, the algorithm constructs a relevant feature space for the missing target gene, where the relevant feature space only includes those co-expression genes of the target gene based on calculating their Pearson's correlation coefficients. Then, some fix-sized feature subspaces are randomly extracted from the relevant feature space to construct extreme learning machine (ELM) regression models between the extracted genes and the target gene. Furthermore, selecting those models without missing input gene values to construct the ensemble framework, and then imputing the missing gene by calculating the average output of all models included in the ensemble framework. Experimental results show that the EELMimpute algorithm is able to reduce the estimated errors in comparison with several previous imputation algorithms.
Risk Factors for Postdischarge Major Thromboembolism and Mortality in Hospitalized Patients with COVID-19 with Cardiovascular Comorbidities: Insights from the CORE-19 Registry
Authors: Giannis Dimitrios , Goldin Mark , Rahman Husneara , Sison Cristina P. , Lesser Martin L. , Ngu Sam , Tsang James , Qiu Michael , Sanghani Shreya , Yeh Jackson , Matsagkas Miltiadis , Arnaoutoglou Eleni , Spyropoulos Alex C.
Published: May 2023

Background Coronavirus disease 2019 (COVID-19) is associated with venous and arterial thromboembolism (VTE and ATE) and all-cause mortality (ACM) in hospitalized patients. High-quality data are needed on postdischarge outcomes in patients with cardiovascular disease.

Objectives To analyze outcomes and identify risk factors for ATE, VTE, and ACM in a high-risk subgroup of hospitalized COVID-19 patients with baseline cardiovascular disease.

Methods We investigated postdischarge rates and associated risk factors of ATE, VTE, and ACM in 608 hospitalized COVID-19 patients with coronary artery disease, carotid artery stenosis (CAS), peripheral arterial disease (PAD), or ischemic stroke.

Results Through 90 days postdischarge, outcome rates were: ATE 27.3% (10.2% myocardial infarction, 10.1% ischemic stroke, 13.2% systemic embolism, 12.7% major adverse limb event); VTE 6.9% (4.1% deep vein thrombosis, 3.6% pulmonary embolism); composite of ATE, VTE, or ACM 35.2% (214/608). Multivariate analysis showed significant association between this composite endpoint and age >75 years (odds ratio [OR]: 1.90, 95% confidence interval [CI]: 1.22–2.94, p = 0.004), PAD (OR: 3.23, 95% CI: 1.80–5.81, p ≤ 0.0001), CAS (OR: 1.74, 95% CI: 1.11–2.75, p = 0.017), congestive heart failure (CHF) (OR: 1.84, 95% CI: 1.02–3.35, p = 0.044), previous VTE (OR: 3.08, 95% CI: 1.75–5.42, p < 0.0001), and intensive care unit (ICU) admission (OR: 2.93, 95% CI: 1.81–4.75, p < 0.0001).

Conclusion COVID-19 inpatients with cardiovascular disease experience high rates of ATE, VTE, or ACM through 90 days postdischarge. Age >75 years, PAD, CAS, CHF, previous VTE, and ICU admission are independent risk factors.
Quantum structured light in high dimensions
Authors: Nape Isaac , Sephton Bereneice , Ornelas Pedro , Moodley Chane , Forbes Andrew
Published: May 2023

Structured light has become topical of late, where controlling light in all its degrees of freedom has offered novel states of light long predicted, enhanced functionality in applications, and a modern toolbox for probing fundamental science. Structuring light as single photons and entangled states allows the spatial modes of light to be used to encode a large alphabet, accessing high dimensional Hilbert spaces for fundamental tests of quantum mechanics and improved quantum information processing tasks. In this tutorial, we outline the basic concepts of high dimensional quantum states expressed in a basis of spatial modes (structured light) and explain how to create, control, and detect such quantum states in the laboratory with a focus on transverse spatial modes such as the orbital angular momentum and pixel (position) modes. Finally, we highlight some example applications of such quantum structured light, from communications to imaging.
Enhancing respiratory comfort with fan respirators: Computational analysis of carbon dioxide reduction, temperature regulation, and humidity control
Authors: Salati Hana , Warfield-McAlpine Patrick , Fletcher David F. , Inthavong Kiao
Published: May 2023

Respirators provide protection from inhalation exposure to dangerous substances, such as chemicals and infectious particles, including SARS-COVID-laden droplets and aerosols. However, they are prone to exposure to stale air as masks create a microclimate influenced by the exhaled air. As a result, exhaled air from lungs accumulating in the mask produces a warm and humid environment that has a high concentration of carbon dioxide (CO2), unsuitable for re-inhalation. Fans are a favorable option for respirators to ventilate the mask and remove the stale air. This study utilized computational fluid dynamics simulation consisting of a hybrid Reynolds-averaged Navier–Stokes-large eddy simulation turbulence method to compare the inhalation flow properties for different fan locations (bottom, top, and side) with regular respirator breathing. Three mask positions, top, side, and bottom, were evaluated under two breathing cycles (approximately 9.65 s of breathing time). The results demonstrated that adding a fan respirator significantly decreased internal mask temperature, humidity, and CO2 concentration. The average CO2 concentration decreased by 87%, 67%, and 73% for locations bottom, top, and side, respectively. While the top and side fan locations enhanced the removal of the exhaled gas mixture, the bottom-fan respirator was more efficient in removing the nostril jet gas mixture and therefore provided the least barrier to respiratory function. The results provide valuable insight into the benefits of fan respirators for long-term use for reducing CO2 concentration, mask temperature, and humidity, improving wearer safety and comfort in hazardous environments, especially during the COVID-19 pandemic.
Effects of ridge parameters on axial spreading of droplet impact on superhydrophobic surfaces
Authors: Gañán-Calvo Alfonso M.
Published: May 2023

Superhydrophobic surfaces decorated with macrostructures have presented remarkable potential in diverse engineering fields, such as aircraft anti-icing. Understanding the effects of the structure shape and size on droplet dynamics is crucial to the design and application of surfaces. Herein, we investigate the maximum axial spreading for droplets impacting on ridged superhydrophobic surfaces with varied ridge shapes and sizes. We propose a mathematical formula to describe the structure shape with profiles quantified by the shape factor, which is easily applied to structure-related studies. The effects of ridge shape and size on the maximum axial spreading coefficient are clarified. The axial spreading of droplets is inhibited by the ridge due to the outward flow of liquid above the ridge tip. The maximum axial spreading coefficient reduces when the ridge becomes sharper, which can be achieved by increasing the shape factor or the ridge height–width ratio. The complex effect of the ridge–droplet size ratio is divided into two regimes according to the shape factor. Furthermore, a prediction correlation of the maximum axial spreading coefficient is established, which involves the coupled effects of all parameters, agreeing well with experimental and simulation results.
Secondary bubble entrapment in shallow and deep water
Authors: Naidu S. Raghavendra , Bhattacharyya Soumarup , Poddar Kamal , Kumar Sanjay
Published: May 2023

The dynamics of a liquid drop impact on a liquid surface is experimentally studied in shallow and deep water. A novel mechanism of secondary bubble entrapment is observed during cavity collapse. It is found that the mechanism of secondary bubble entrapment differs slightly from the mechanism of primary bubble entrapment (regular entrapment). This is due to an increase in the Weber number and Froude number, which increases the maximum cavity depth and changes the cavity shape. It is also found that the secondary bubble formation is not only dependent on the impact velocity of the drop but also on the drop shape at the time of impact on the liquid surface. Secondary bubble entrapment was observed both in shallow and deep water, but the mechanism of bubble entrapment varies differently in shallow water and deep water. This is due to the effect of reservoir bottom on the flow field around the cavity in shallow water, which is absent in deep water. The secondary bubble entrapment phenomenon occurs for the lowest vertex cone angle of the cavity with a cusp base at the reservoir bottom, and the size of the secondary air bubble is found to be independent of the impact conditions. It is found that the vertex cone angle of the cavity depends on the Bond number, and it increases with increase in the Bond number at a given water depth.
Converbs of Sinitic varieties in Qīnghǎi‑Gānsù linguistic
area
Authors: Shao Mingyuan , Lin Xuna
Published: May 2023

This article discusses the semantic and syntactic properties of
converb markers =Shi, =Zhe, and
=Tala in Sinitic varieties in the Qīnghǎi-Gānsù Linguistic
Area (qgla), and defines them as converb enclitics rather than
conjunctions, modal particles, or other functional words. =Shi
is a conditional converb enclitic while =Tala is a terminative
converb enclitic; both enclitics derive their respective properties from Altaic
languages. The enclitic =Zhe expresses the coordinative and
narrative functions, derived from its Altaic source, and the conjunctional
function, which is an innovation. The productive use of the converbs coincides
with the sharp decline of serial verbs in Sinitic varieties in qgla, and such a phenomenon emerges through intense contact among the Altaic,
Sinitic and Tibetan languages in the area.
Púnandtio̍hin Penang Hokkien
Authors: Hing Jia Wen
Published: May 2023

Penang Hokkien was spoken by the early Hokkien settlers as a heritage language in a Malay dominant environment before it became a lingua franca of the Chinese communities in present-day Penang and its neighboring states in Northern Malaysia. Over two centuries, Penang Hokkien has assimilated Malay words and structures. This article discusses the forms and functions ofpúnandtio̍h, which have assimilated Malay elements as response strategies to two key triggers for deviation from the baseline Southern Min dialect: ambiguity and complex structure. Through a detailed study ofpúnandtio̍h, this article contributes to a better understanding of the development of a Malay-dominant heritage language that is based on a Chinese dialect spoken in the Malay peninsula.
Time–frequency Transformer with shifted windows for journal bearing-rotor systems fault diagnosis under multiple working conditions
Authors: Chen Feiyu , Wang Xiaojing , Zhu Yan , Yuan Weimin , Hu Yusheng
Published: May 2023

This paper proposes a new Time–frequency Transformer with shifted windows method (TFSwin-T) for fault diagnosis of journal sliding bearing-rotor systems under multiple working conditions. Current convolutional neural network models struggle with accurate diagnosis in complex and variable working conditions. TFSwin-T uses time–frequency representations of vibration signals to extract features from typical sliding bearing faults, such as scratch, fretting wear, pitting, and fatigue crack. Our model adapts to multiple speeds and reduces computing power consumption through the use of a Transformer encoder with shifted windows. We demonstrate the effectiveness of our optimal fault diagnosis model structure for both journal bearing and rotor fault diagnosis, with higher diagnostic precision and generalizability compared to benchmark models and other advanced methods in complex working conditions.
Swarming procedures to solve the novel perturbed delay third order singular model
Authors: Sabir Zulqurnain , Ben Said Salem , Al-Kouz Wael
Published: May 2023

The current study shows a novel singular perturbed delay third order model (NSPD-TOM) with its two categories using the conventional Lane-Emden mathematical model. The comprehensive details of the perturbed, shape/delay and singular terms are also provided for both categories of the NSPD-TOM. The numerical results for solving the NSPD-TOM are provided by applying the procedures of artificial neural networks together with the optimizations performances of global swarming and local active set methods. The NSPD-TOM is performed based on the accuracy, substantiation, and authenticity using the achieved and exact results comparison. Moreover, the stochastic procedure is further authenticated by applying the statistical operators to solve the NSPD-TOM.
Deep neural network method for solving the fractional Burgers-type equations with conformable derivative
Authors: Ye Yinlin , Liu Xinyi , Li Yajing , Fan Hongtao , Zhang Hongbing
Published: May 2023

In this article, we introduce the modified physics-informed neural network (PINN) method for finding data-driven solutions of three classes of time-fractional Burgers-type equations under the conformable sense. Since conformable derivative satisfies the chain rule, automatic differentiation can be applied to compute it directly to avoid truncation and other numerical discretization. In addition, the locally adaptive activation function and two effective weighting strategies are introduced to improve solution accuracy. As a result, three numerical examples indicate that the modified PINN method gives an efficient and reliable solution.
Effect of number of well and core radius on the binding energy and optical properties of multishell spherical quantum dot with parabolic potential
Authors: Kirak M
Published: May 2023

In the current study, the probability densities and binding energy of the ground state and first excited sate in multishell quantum dot with parabolic confinement potential have been examined. Also, the effects of core radius, the number of well in structure and the presence of impurity on the total optical absorption coefficient have been investigated. The finite difference method has been used to obtain the energy levels and related wave functions of the system within framework effective mass approximation. The results obtained reveal that the number of well, especially the first five values, have a considerable impact on the critical core values of binding energy. It is found that the presence of impurity and the number of wells cause a blue shift in the peak positions of total absorption coefficients. Moreover, our results show that these factors have an important effect on the magnitude of optical properties.
Dynamic characteristics of rectangular single-layered black phosphorus-based mass sensor
Authors: Ling Xueqing , Zhang Yiqing , Xu Feng
Published: May 2023

Recently, anisotropic black phosphorus (BP) has been reported to have significant physical and mechanical properties, and BP-based mass sensors have the latent applications in detecting the mass of nanoparticles attached on BP. In this paper, an orthotropic plate model (OPM) attached concentrated mass and molecular dynamics (MD) simulations are adopted to investigate the dynamic characteristics of rectangular single-layered BP-based (RSLBP-based) mass sensors. The influences of mass, position of the attachment and RSLBP size on the fundamental frequency of RSLBP-based mass sensor are discussed. The results show that when attachment mass increases, or the position of attachment moves from the edge to the middle of RSLBP, the fundamental frequency of the RSLBP-based mass sensor decreases. The fundamental frequency of RSLBP-based mass sensors decreases more significantly with increasing the attachment mass when the size of RSLBP is very small. The results calculated by OPM attached concentrated mass are agreed well with the results calculated by MD simulations, which indicates that the OPM attached concentrated mass can forecast the dynamic characteristics of RSLBP-based mass sensors significantly.
Cavitation erosion-corrosion behaviour of Fe-19Cr-15Mn-0.66 N high nitrogen austenitic stainless steel in sodium chloride solution
Authors: Li Liang , Qiao Yanxin , Zhou Huiling , Li Xin , Huang Lei , Yang Lanlan , Wang Lei
Published: May 2023

In this work, the cavitation erosion (CE)-corrosion behaviors of high nitrogen austenitic stainless steel (HNSS) Fe-19Cr-15Mn-0.66 N were investigated under both static and CE conditions in 0.5 mol l−1 NaCl solution. For the sample after 8 h CE, the cumulative mass loss increased by 15% in 0.5 mol l−1 NaCl solution compared to distilled water, indicating that the corrosive media promoted mass loss. The corrosion behavior of the samples under static and CE conditions was evaluated using electrochemical techniques. The results showed that compared with the samples under static conditions, the samples under CE had a higher corrosion rate, and the corrosion resistance of the samples gradually decreased with the prolongation of C E time.The open circuit potential and potentiodynamic polarization tests showed a higher corrosion rate under CE conditions. The electrochemical impedance spectroscopy results revealed a decrease in corrosion resistance with increasing CE time. The XPS results showed that CE has a significant effect on the composition of the passive film, promoting a notable increase in Cr2O3 and Fe2O3.
Structural, magnetic and magnetocaloric effect of pyrochlore iridate Er2Ir2O7
Authors: Ezairi Sara , Elouafi Assaad , Lmai Fatima , Tizliouine Abdeslam
Published: May 2023

The structural, morphological, magnetic and magnetocaloric properties of Er2Ir2O7 are investigated. The x-ray diffraction analysis showed that Er2Ir2O7 has a cubic structure with the Fđ3m space group. Using Williamson-Hall (W-H) plot, the crystallite size was found to be smaller than that obtained from the SEM image. Magnetic measurements revealed a weak ferromagnetic transition at TC = 140 K, caused by the appearance of magnetic order of the Ir moments. ΔT (temperature at full width of half maxima) was estimated to be 27 K and 40 K for magnetic field changes of 40 kOe and 50 kOe, corresponding to the relative cooling power (RCP) values of 98 J kg−1 and 128 J kg−1, respectively. Temperature-averaged Entropy Change (TEC) was calculated for all applied magnetic fields, and found to be slightly lower than

−
Δ

S

M

max

values, indicating less hysteresis loss in the compound Er2Ir2O7 during the magnetic transition. This study provides a new pyrochlore material for MCE magnetocaloric applications.
Theoretical investigations of optoelectronic and transport properties of halide based K2YAuX6 (X = Cl, Br) double perovskites
Authors: Mustafa Ghulam M , Waqar Raja , Saba Sadaf , Noor N A , Farooq Zahid , Imran Muhammad , Behram R B , Alanazi Yousef Mohammed
Published: May 2023

Intriguing optoelectronic and transport properties with huge compositional range and structural stability make double perovskites interesting for energy harvesting technologies. Here we theoretically investigate the structural, optical, mechanical, and transport properties of K2YAuX6 (X = Cl, Br) double perovskites using the WIEN2K code. Based on the calculated values of the tolerance factor and enthalpy of production, the thermodynamic and structural stability is affirmed. The ductile nature of these compositions is revealed in the computation of Poisson’s ratio (>0.26) and Pugh’s (1.75) ratio. The involvement of s-states of K, p-states of Cl/Br, and d-states of Y and Au in the formation of valence and conduction band edges is exhibited from the density of state plots. Using the Tran-Blaha mBJ potential and spin-orbital coupling, the energy bandgap value for K2YAuCl6 and K2YAuBr6 is reported as 3.20, and 2.70 eV, respectively, which is suitable for the fabrication of light-emitting diodes. Optical behavior is further explored regarding complex dielectric constant, refractive index, optical conductivity, optical loss, and absorption factor. The small value of thermal conductivity with large value of electrical conductivity, Seebeck coefficient, power factor, and figure of merit revealed the potential of these materials for the fabrication of light-emitting diodes and thermoelectric generators.
InSe–Te van derWaals heterostructures for current rectification and photodetection
Authors: Wang Hao , Xian Guo-Yu , Liu Li , Liu Xuan-Ye , Guo Hui , Bao Li-Hong , Yang Hai-Tao , Gao Hong-Jun
Published: May 2023

As the basis of modern electronics and optoelectronics, high-performance, multi-functional p–n junctions have manifested and occupied an important position. However, the performance of the silicon-based p–n junctions declines gradually as the thickness approaches to few nanometers. The heterojunction constructed by two-dimensional (2D) materials can significantly improve the device performance compared with traditional technologies. Here, we report the InSe–Te type-II van der Waals heterostructures with rectification ratio up to 1.56 × 107 at drain–source voltage of ± 2 V. The p–n junction exhibits a photovoltaic and photoelectric effect under different laser wavelengths and densities and has high photoresponsivity and detectivity under low irradiated light power. Moreover, the heterojunction has stable photo/dark current states and good photoelectric switching characteristics. Such high-performance heterostructured device based on 2D materials provides a new way for futural electronic and optoelectronic devices.
Electric modulation of anisotropic magnetoresistance in Pt/HfO2–x
/NiO
y
/Ni heterojunctions
Authors: Ye Xiaoyu , Zhu Xiaojian , Yang Huali , Duan Jipeng , Sun Cui , Li Run-Wei
Published: May 2023

Electric field control of magnetism through nanoionics has attracted tremendous attention owing to its high efficiency and low power consumption. In solid-state dielectrics, an electric field drives the redistribution of ions to create one-dimensional magnetic conductive nanostructures, enabling the realization of intriguing magnetoresistance (MR) effects. Here, we explored the electric-controlled nickel and oxygen ion migration in Pt/HfO2−x
/NiO
y
/Ni heterojunctions for MR modulation. By adjusting the voltage polarity and amplitude, the magnetic conductive filaments with mixed nickel and oxygen vacancy are constructed. This results in the reduction of device resistance by ∼103 folds, and leads to an intriguing partial asymmetric MR effect. We show that the difference of the device resistance under positive and negative saturation magnetic fields exhibits good linear dependence on the magnetic field angle, which can be used for magnetic field direction detection. Our study suggests the potential of electrically controlled ion migration in creating novel magnetic nanostructures for sensor applications.
Theoretical investigation of F-P cavity mode manipulation by single gold nanoparticles
Authors: Shi Xusheng , Luo Zhiqiang , Li Zhi-Yuan , Yu Huakang
Published: May 2023

The ability to manipulate microlaser is highly desirable towards high-performance optoelectronic devices. Here we demonstrate feasible mode manipulation of Fabry–Pérot type microlasers of a perovskite nanowire via incorporation of single gold nanoparticles. The influences of resonant wavelength, quality factor and emission directions are successively investigated using a two-dimensional finite-difference time-domain method. It is found that blueshift of resonant wavelength could be achieved together with either promoted or degraded quality factor of the microlaser via single Au NPs with varied sizes. Unidirectional emission could also be realized which is favorable for on-chip integration. Our results provide useful reference for feasible manipulation of light–matter interactions and mode selection.
Non-exotic static spherically symmetric thin-shell wormhole solution in f (Q, T ) gravity*
Authors: Tayde Moreshwar , Ghosh Sayantan , Sahoo P.K.
Published: May 2023

In this study, we conduct an analysis of traversable wormhole solutions within the framework of linear

gravity, ensuring that all energy conditions hold for the entire spacetime. The solutions presented in this paper are derived through a comprehensive analytical examination of the parameter space associated with the wormhole model. This involves considering the exponents governing the redshift and shape functions, as well as the radius of the wormhole throat (

), the redshift function value at the throat (

), and the model parameters (α and β). Moreover, we establish bounds on these free parameters, which guarantee the satisfaction of the energy conditions throughout spacetime and also provide two solutions. Furthermore, we use the Israel junction condition to observe the stability of a thin-shell around the wormhole. Finally, we calculate the null energy condition criteria as well as the potential for the thin-shell and how it varies with the chosen shape function.
A parametric study of ultra-short laser surface patterning of freeze foamed TCP-Zr: effects of laser parameters on surface morphology
Authors: Filipov E , Angelova L , Ahlhelm M , Avdeev G , Buchvarov I , Daskalova A
Published: May 2023

The application of ultra-short lasers pulses in surface modification has gained a significant interest as they allow precise patterning of materials without inducing any collateral thermal damages. Tricalcium phosphate (TCP) is a widely exploited material for scaffolds in bone tissue engineering; however, such composites could lack the appropriate porosity that is crucial for the tissue regeneration process. This article presents a combination of fabricating porous ceramic scaffolds and their processing by a femtosecond (fs) laser for enhancement of the surface properties. The morphological observation revealed evident differences on the exterior of the treated zones, as the dense structure was preserved but the porosity of the surface appeared improved. An X-ray diffraction analysis showed that the laser treatment increased the crystallinity of ZrO2 and TCP, thus stabilizing the material. The laser-induced surface microporosity substantially changed the wetting state of the scaffolds’ surfaces making them hydrophilic. Based on these findings, we could state that the femtosecond laser processing of TCP-ZrO2 composites could have the potential to improve their applications in fields such as bone tissue engineering.
Lidar monitoring of the aerosol content in the near-ground atmospheric layers over Sofia
Authors: Grigorov I , Schumanov K
Published: May 2023

Lidar measurements provide possibility to determine and localize the sources of aerosol emissions in the air, to determine the presence of airborne transport of dust in the atmosphere, to track in real-time aerosol movement above vast territories [1-4]. Presently, along with building networks of ground lidar stations, such as the European Aerosol Research Lidar Network (EARLINET), it becomes more and more important to develop and refine the lidar methods of processing the data from measurements to retrieve the necessary information [5]. The present study comments on results of aerosols monitoring in the lowest atmospheric layers above Sofia by using lidar remote sensing. More than 20 lidar measurements were carried out in the period January – June 2022. The lidar system emitted laser pulses nearly horizontally within the planetary boundary layer (PBL); the reflected pulses were collected to calculate the range-corrected signals and to produce color-coded time-distance diagrams. These diagrams, superimposed on a map of the city to illustrate the location of the aerosol layers were published on the website of the Laser Radar Laboratory of the Institute of Electronics (IE-BAS) at: http://www.ie-bas.org/Departments/LidarData_Horizont/Quicklooks-Horizont.htm.
Application of fluorescence spectroscopy for analysis of different onion varieties during storage in storehouse
Authors: Mihalev M S , Vladimirova – Mihaleva L S , Slavova V , Genova S
Published: May 2023

The present study aimed to establish the application of fluorescence spectroscopy for a comparison of three onion genotypes after harvest and at certain intervals of storage period. The genotypes were stored in a storehouse under ambient conditions. This will allow the method to be applied as non-invasive in quality control of onion production during storage. The experimental studies were performed with sixty-three accessions (21 after three months of storage, 21 after 6 months of storage and 21 after 9 months of storage). The equipment for emission fluorescence spectra generation is mobile and has applicability in local characteristics of the production. In its adjustment (optical tuning) a systematic engineering approach based on the classical principles of modern optoelectronics is applied. The results of the experiment will contribute to the optimization of the time for analysis of onion genotypes and will support the breeding process in its initial stages when it is necessary to qualify a large set of samples.