bluuebunny/crossref_metadata_2025 huggingface dataset:
The Evaluation and Suggestion for the Development of Dried Tangerine Peels Industry a Case Study of Xinhui
Authors: Wang Xinyao
Published: May 2021

n the market of dried tangerine peels, Xinhui dried tangerine peels industry, which is represented by Xinhui Dried Tangerine Peels Village (XDV)”, is the most representative among other dried tangerine peels. In the paper, the case study and qualitative method are used to analyze the current condition of the Xinhui dried tangerine peels industry, and to provide suggestions for the future development of the Xinhui dried tangerine peels industry. It turns out that the disadvantages of XDV are the relatively low popularity, a large number of small-sized competitors, and the small differentiation between XDV and other small producers, while the advantages of XDV are its deep culture and the high quality of XDV products. Therefore, the appropriate method for the future development of the XDV is the branding strategy since the disadvantages of the XDV can be solved by branding strategy, and the advantages are corresponding to the application of branding strategy. There are several steps to take to reach the success of the branding strategy in several aspects. The first step is to define a clear value proposition, which makes the direction of the development clear. Secondly, XDV should use a diversification strategy for the future development of its products. Also, with the improvement of products, promotion is necessary for the future development of XDV because a good promotion can attract more potential consumers and help XDV remain popular. Lastly, with high popularity, the price of the Xinhui dried tangerine peels from XDV should be lower since the sales have already made up for the cost of maintaining the “high-cost” channel. As a result, the development methods that this paper provides for the researchers and businessmen of Xinhui dried tangerine peels market would be helpful to apply and confirm in the future.
Logic management of leadership strategy from the perspective of value innovation
Authors: Wang Fei
Published: May 2021

The reason why many enterprises can not achieve high growth is that their leadership and management strategic logic is still limited by the traditional management logic based on competition. However, in order to obtain sustained high growth, we must take customer value as the guidance and carry out value innovation, so as to make enterprises form lasting competitive advantages that are hard to imitate.
Study on Countermeasures of improving public health emergency management system in Liaoning Province Based on epidemic control survey data
Authors: Ying Sun
Published: May 2021

In the current round of prevention and control of cowid-19, Liaoning Province closely combines the current new situation, new changes and new characteristics, improves the normal prevention and control mechanism of timely discovery, rapid disposal, precise control and effective disposal, ensures that the management measures are effective and the work is in place, so as to create a healthy environment, maintain social stability and protect people's health. However, at the same time, through the statistics of the proportion of technical personnel and management personnel, the proportion of professional personnel, the number of disease control personnel per 10000 people and other data, we found that there are obvious shortcomings in the public health emergency management system of our province. Therefore, we should seize the opportunity, sum up the experience, draw lessons, pay close attention to the shortcomings, plug the loopholes, develop the advantages and avoid the disadvantages, and comprehensively improve the ability to deal with major public health emergencies.
Study of the Constrained Resources to Projects Based on the Random Networks
Authors: Li Mingyu , Yang Li
Published: May 2021

In this paper, a number of concurrent network projects with random activities are studied, and the proposed model enables people to control various resources such as rare and expensive resources transported from outside in a short time. For each project, the schedule date and the admissible confidence probability of timely completion of the project were defined. The initial instants of realization of all projects, the required total power of each of the reproducible resources, the delivery schedule of rare reproducible resources that are not at the disposal of the project management system, and the schedule of beginning all activities were determined. The minimal nonoperational costs, such as penalty provisions for failure to execute the project in time, fines for idling of the rare external resources, costs of resource lease were used as the target function. The developed model can be used to plan and supervise one or more random PERT-like network projects. It can significantly reduce the cost of project implementation.
How to Motivate Engineering and Technical Personnel to Innovate? The Impact of Human Resource Management Strength on Employee Innovation Behavior
Authors: Ruijuan Yang , Jiale Song , Chengli Shi
Published: May 2021

Based on a survey of 611 engineering and technical personnel in Chinese manufacturing enterprises, this paper uses hierarchical regression analysis and structural equation model to examine the influence path of human resources management strength on employee innovation behavior. Further, the Bootstrap method was used to test the mediating effect. The results show that human resource management strength has a significant positive impact on employee innovation behavior and its two dimensions. Organizational atmosphere and employee psychological conditions play multiple mediating roles between human resource management strength and employee innovation behavior. Compared with employees’ psychological conditions, organizational atmosphere has a more significant mediating effect on innovation ideas generate. There is no significant difference between the mediating effect of organizational climate and employee psychological conditions on the implementation of innovation ideas generate.
Innovation and supervision of rural Internet Finance
Authors: Linna Fu
Published: May 2021

Rural Internet finance has become an important support for the development of rural economy in China, and its business field and scope continue to expand. In the process of rapid development of rural Internet finance, it not only brings new opportunities for rural economic development, but also brings new challenges to rural economic stability. From the perspective of promoting the sustainable and healthy development of rural Internet finance, this paper analyzes the current situation and risks of China’s rural Internet finance innovation and development, and puts forward measures and Countermeasures to strengthen supervision and reduce risks.
Analysis of Contemporary College Students’ Employment Model Based on Logit Model and Machine Learning
Authors: Li Huanhuan
Published: May 2021

With the emergence of Internet big data, cloud computing, artificial intelligence and other new technologies, employment positions have also undergone profound changes. Small, medium and micro enterprises, new business forms and new models put forward new requirements for employment services in Colleges and universities. Starting from the current situation of College Students’ employment, this paper analyzes the reasons for the difficulty of College Students' employment and discusses how to solve the problem. In view of the group differences in the employment of college graduates, this paper puts forward some countermeasures and suggestions to speed up the development of service industry and promote employment, formulates the long-term strategy for the development of talent training institutions, and constructs an advanced account management system for college students. This paper analyzes the students' self-concept from the aspects of social needs, the change mode of school cultural concept and the lack of professional development. On the issue of College Students' employment, this paper analyzes the characteristics of College Students' employment and the needs of employers with the employment supply and demand as the main line. The results show that up to 26% of the graduates work in enterprises and at least 14% in administrative organs.
Research of Project Portfolio Selection Model Based on Organizational Strategy
Authors: Wang Yaping
Published: May 2021

Based on the theory of the existing research of the project portfolio management, the paper analyzes the key factors of the project portfolio selection, and evaluates them using the fuzzy comprehensive evaluation method. Finally, the paper builds a project portfolio choice integer programming model based on 0/1 integer programming, which is based on the organizations strategies.
Influencing Factors and Promotion Strategies of Enterprise Safety Management Effectiveness
Authors: Yuanshuai Wang , Chunhui Yang , FuZe Shao
Published: May 2021

In order to deeply explore the influencing factors of corporate safety behavior management efficacy, this paper utilizes Chinese engineering corporations as research objects, the paper explores the impact of corporate safety culture and safety training investment on corporate safety management effectiveness, also the interacting impact of f corporate safety culture and safety training investment on corporate safety management efficacy. The empirical results show that corporate safety culture and safety training investment both have a positive impact on corporate safety management effectiveness, also the interacting effect is positive. The research in this paper therefore provides new solutions and perspective for improving the effectiveness of corporate security behavior management, which has great significance for management practice.
Efficiency evaluation of unattended convenience store based on bi-level DEA with multi-followers
Authors: Yang Zhuang , Hui Li , Chen Xudong
Published: May 2021

As an application of digital concepts, unattended convenience stores are widely disseminated and considered one of the trends of future business development. It is an important consideration for the development of unattended convenience stores to determine the potential of operation efficiency and improve inefficient units. This paper establishes a bi-level DEA model with multi-followers and uses weak disposability technology to deal with undesirable intermediate measures, aiming to accurately evaluate the performance of the whole bi-level system of unattended convenience stores and each participant. Thus, extended Kuhn-Tucker conditions are applied to solve the proposed model. It is found that the benefit efficiency of the lower subsystem always belongs to the maximum and minimum benefit efficiency of all followers, and the benefit efficiency of the system is between the upper and lower benefit efficiency. Using a case study of unattended convenience stores in the Chengdu area, the validity and practicability of the model in the evaluation of benefit efficiency are shown and more explicit management opinions are provided.
Analysis on green innovation cooperation of government, industry, University and Research Institute from the perspective of evolutionary game under the conditions of informationization
Authors: Duan Zhaoqian , Zhu WeiJian , Bai Dan
Published: May 2021

Under the new normal of the economy where informatization and industrialization are deeply integrated, the balanced development of economy and ecology is increasingly important. How to promote the development of green innovation through policy means under the conditions of informatization and realize the balanced development of economy and ecology is a key issue for the government.. The development of informatization has facilitated the dissemination of information, knowledge, and funds between enterprises and academic institutions, promoted the establishment of mutual trust and cooperation between enterprises and academic institutions, and improved the efficiency of green technology knowledge conversion. Based on the evolutionary game theory, this paper constructs a game model of green innovation cooperation between government, industry, University and Research Institute, analyzes the strategy selection of government, enterprise and university research side in the game process, and studies the stability of green innovation cooperation of government, industry, University and Research Institute. The analysis results show that default fines, excess income, government subsidies, etc. have an impact on the benefits of green innovation, and on this basis, relevant policy recommendations are put forward for government-industry-university-research green innovation cooperation under the conditions of informatization.
Research Overview of Job Crafting Based on Knowledge Graph
Authors: Liu Hui , Jiarui Fang
Published: May 2021

Based on the relevant theories of social network research, this research uses CiteSpace software, taking the literature on job crafting research published in the web of science core corpus database 2000-2019 as the research object. Word analysis, cluster analysis and other analysis methods study and interpret 441 documents and data, draw a cooperative map of authors in the field of job crafting, knowledge maps of highyielding countries, knowledge maps of co-word analysis, and cluster analysis knowledge map to reflect current status and development trends in the research field, so that future research can find a suitable research direction and promote the further research of job crafting.
Analyst-Firm Relations and Reciprocity: Evidence from China
Authors: Hou Jianlei , Zhao Shangmei , Yang Haijun
Published: May 2021

This paper quantifies the analyst-firm relations based on an informational characteristic-model of analyst coverage innovatively. Furtherly, the rationality of analyst-firm relations is investigated based on the reciprocity between analysts and target firms by examining the impact of analyst-firm relations on stock recommendation and analysts’ earnings forecasting performance. Empirical results suggest that analysts are prompted by close analyst-firm relations to render relatively positive rating for target firms and reciprocated by more firm-specific information for better earnings forecasting performance.
Research on the application of Lean production mode in enterprises——Take Desi fogg company for example
Authors: Ji Xiaoli
Published: May 2021

Lean production is the third milestone of industrialization in human history. This is a revolutionary production and operation practice. Its core idea is to reduce waste, establish an efficient production system, improve corporate profits. It represents the direction in which manufacturing, or manufacturing standards, are moving today. With the continuous advancement of the information revolution, manufacturing enterprises must re-integrate external environmental information, transform their ideas and methods, and at the same time use big data and artificial intelligence to strengthen the manufacturing industry and form a new production mode.

This article expounds the theory of lean production and basic methods from the perspective of big data and artificial intelligence. It combined with desi fogg existing organizational structure, site management, quality management, product development, production organization, problems existed in the aspects of applied research in the core of lean production ideas and principles, proposed the desi fogg lean production plan, and solve the management problems of the production process and waste of resources, establish the enterprise system of lean production system, and improve the level of the site management、 production quality and enterprise competitiveness.
Cost stickiness, corporate risk and management shareholding
Authors: Yan Zhang
Published: May 2021

Normally, the cost stickiness in enterprises further reduces the efficiency of asset allocation and the accuracy of earnings decision, thus aggravating the risk taking. This paper takes Chinese A-share listed companies from 2009 to 2019 as samples to empirically test the impact of cost stickiness on enterprise risk and the moderating effect of long-term incentive mechanism on this impact. The results show that cost stickiness increases corporate risk significantly. Management shareholding further aggravates the impact of cost stickiness on corporate risk. After further analysis, it is found that cost stickiness significantly increases corporate investment risk, meanwhile, cost anti-stickiness also significantly increases corporate risk, and management shareholding also aggravates the impact of cost anti-stickiness. This study further expands the research on the economic consequences of cost stickiness, also provides new ideas for enterprises to control the level of management shareholding to further restrain the degree of cost stickiness.
Non-linear Effect of Exchange Rate on Economic Growth in OECD Countries——Panel data analysis based on PSTR model
Authors: Kong Shuning
Published: May 2021

Based on the panel data of 35 OECD countries from 2001 to 2019, this paper empirically analyzes the nonlinear effect of exchange rate on economic growth of countries through PSTR model. The results show that exchange rate appreciation has a certain role in promoting economic growth. When the value of the local currency is high, the exchange rate appreciation has a stronger effect on promoting economic growth; when the value of the local currency is low, the exchange rate appreciation has a weaker effect on economic growth. Further research shows that when the local currency value is low, the development of export trade has a strong positive impact on economic growth, while the inflow of FDI has a weak effect on economic growth. When the currency value is low, the promotion effect of export trade on economic growth is relatively weak, while the inflow of FDI shows a stronger promoting effect on economic development, and the nonlinear effect of exchange rate on economic growth is positive. It is the comprehensive effect of these channels.
Research on performance evaluation mechanism of fresh agricultural products distribution system
Authors: He-Kailun  , Min Luo
Published: May 2021

Performance evaluation of fresh agricultural products public distribution system includes evaluation index and evaluation method. The distribution system is a strategic organization, the Balanced ScoreCard method should be used for index design, and the evaluation indexes include distribution enterprises, distribution centers and alliances. For the evaluation method, the fuzzy comprehensive evaluation method combining qualitative and quantitative methods is selected. Scientific evaluation mechanism provides the basis for the development strategy of distribution system.
Development and Transformation Strategies of Banking Industry under the Background of Fintech
Authors: Sun Fujia
Published: May 2021

In recent years, emerging technologies such as blockchain, big data, and artificial intelligence have developed rapidly and been applied in the financial field, which has caused earth-shaking changes in the overall structure of the financial industry and exerted a profound impact on the banking industry in particular. This paper starts with an overview of financial technology, analyzes the opportunities and challenges faced by the banking industry in the context of financial technology, and makes relevant recommendations on the coordinated development and transformation of the banking industry.
Innovative Construction of Online Teaching Models for "Double Teachers" Teachers in the Internet Era
Authors: Cheng Jie , Bie Birong
Published: May 2021

Based on the teaching platform, the implementation of "dual-teacher" classrooms is different from the previous "large classes". Small classes scattered in different locations can share excellent teachers, which can not only ensure the quality of teaching, but also truly alleviate the shortage of teachers. This research first defines the concept of "dual-professional" teachers, and then clearly expounds the connotation and essential characteristics of "dual-professional" teachers, and analyzes the model construction of the current teacher team construction and "dual-professional" teacher team construction in China. Constructing an Internet-based "dual-professional" teacher innovation model, expounding the characteristics of dual-professional teaching and MOOC in detail, explaining the significance and advantages of blending dual-professional teaching and MOOC teaching, and studying related theories based on the foundation, then take this college as an example to summarize the mixed teaching practice of the curriculum fusion dual-teaching and MOOC teaching through case studies and make attribution analysis. The questionnaire survey method is used to investigate the learning data of students. The experimental results show that the students' three-dimensional goals can be achieved well under the mixed teaching; the comprehensive performance has been greatly improved, and the teaching effect of 1+1>2 has been achieved; teachers and students are more satisfied with this blended teaching. At the same time, through the development of the mixed teaching practice of this course, teachers and students are familiar with MOOC teaching, discover and use high-quality MOOC resources on the Internet; arouse the interest of teachers and students in the construction of MOOC in this school; improve the information literacy of teachers and students.
Influence of Network New Media on the Digital Dissemination of Chinese Literature
Authors: Wu Xudi
Published: May 2021

The significance and value of literature itself determine the importance of literary communication, and literary text communication contains the communication of literary value and significance. Communication is the carrier of transmitting literary works and the bridge between literature and audience. At present, the network new media has become the most frequently used media platform for the public, providing an independent space for individual information production, accumulation, sharing and dissemination. In this paper, literature communication is defined as "the communication of literary text", taking the literature communication caused by "Wang Guozhen's death" as the research object, through the analysis of the content of relevant information and the questionnaire survey of the audience, the statistics show that the people who get the information through wechat circle of friends are the most, accounting for 33%, and the influence of network new media on literature communication and the reasons for its influence are analyzed.
Evaluation of financial investment risk of enterprises
Authors: Ni Jiangwei
Published: May 2021

this paper mainly focuses on the evaluation of enterprise financial investment risk. Based on the current situation of enterprise financial investment risk management, this paper first analyzes the overview of enterprise financial investment risk assessment basis, then introduces the relevant influencing factors of enterprise financial investment risk assessment, and finally combines qualitative and quantitative concepts with specific investment situation to establish risk In order to enhance the quality and effect of enterprise financial investment risk assessment, the purpose is to provide reference for relevant research.
Erythema elevatum et diutinum – eine mögliche IgA-vermittelte Reaktion nach einer Behandlung mit Adalimumab
Authors: Al-Gburi S. , Appelt L. , Beissert S. , Aschoff R.
Published: May 2021

Das Erythema elevatum et diutinum ist eine eigenständige Form der leukozytoklastischen Vaskulitis, die mit systemischen Krankheiten assoziiert sein kann. Hier präsentieren wir Ihnen einen Patienten, der nach jahrelanger Therapie mit Adalimumab schmerzhafte Knoten an den Füßen und Knien entwickelte. Begleitend zeigte sich eine prominente (polyklonale) IgA-Hypergammaglobulinämie ohne Anhalt für eine hämatoonkologische Grunderkrankung. Dapson erwies sich als eine effektive Therapieoption.
Bullöses Sweet-Syndrom nach einem Zeckenstich
Authors: Heil J. , Abraham S. , Eckardt C. , Laske J. , Beissert S. , Günther C.
Published: May 2021

Wir berichten über einen Patienten, der eine Woche nach einem Zeckenstich Fieber und Papulovesikel entwickelte. Eine disseminierte Borrelien-Infektion sowie eine blasenbildende Erkrankung konnte ausgeschlossen werden. Sowohl klinisch als auch histologisch bestätigte sich ein bullöses Sweet-Syndrom, sodass eine systemische Steroidtherapie begonnen wurde. Darunter besserten sich die Beschwerden des Patienten rasch.

Die Umfelddiagnostik ergab weder Hinweise auf eine hämatologische Erkrankung noch auf eine Medikamenteneinnahme als Auslöser. Dieser Fall deutet darauf hin, dass auch Arthropodenstiche als Trigger für ein Sweet-Syndrom in Betracht gezogen werden können.
Palladium-Catalyzed Aerobic Oxidative Carbonylation of Amines Enables the Synthesis of Unsymmetrical N,N′-Disubstituted Ureas
Authors: Zeng Honglan , Du Hongyan , Han Wei , Gong Xu , Zhang Jie
Published: May 2021

A ligand-free palladium-catalyzed aerobic oxidative carbonylation of amines for the synthesis of ureas, particular unsymmetrically N,N′-disubstituted ureas, which cannot be accessed by any other palladium-catalyzed oxidative carbonylation of amines to date, is presented. An array of symmetrical and unsymmetrical ureas were straightforwardly synthesized by using inexpensive, readily available, stable, and safe amines with good to excellent yields under a pressure of 1 atm. This novel method employs oxygen as the sole oxidant and offers an attractive alternative to transition-metal-based oxidant systems
Polymers Made by Inverse Vulcanization for Use as Mercury Sorbents
Authors: Chalker Justin M. , Mann Maximilian , Worthington Max J. H. , Esdaile Louisa J.
Published: May 2021

Inverse vulcanization is a process in which highly abundant and low-cost elemental sulfur is copolymerized with an unsaturated organic molecule such as a polyene. This process has provided a variety of useful materials with high sulfur content—typically 50% or greater in sulfur by mass. These materials have garnered increasing interest in research as sorbents for mercury, due to the high affinity of sulfur for mercury. In this review, the features of mercury sorbents made by inverse vulcanization are presented. Additionally, case studies are provided to illustrate the variety of polymer architectures accessible with this chemistry, the versatility of these materials in mercury remediation, and prospects for industrial use.

1 Introduction

2 Sulfur Polymers by Inverse Vulcanization

3 Sulfur Polymers as Mercury Sorbents

4 Increasing Surface Area to Improve Mercury Uptake

5 Crosslinker Considerations

6 Sorption of Different Forms of Mercury

7 Life-Cycle Management

8 Conclusions and Outlook
Effects of the Graft Type Used for Anterior Cruciate Ligament Reconstruction on Isokinetic Muscle Strength and Quality of Life
Authors: Yapali Gökmen , Kürklü Galip Bilen
Published: May 2021

There is no consensus about which graft type should be used in patients who will undergo anterior cruciate ligament (ACL) reconstruction so far. In this study, it was aimed to compare the quality of life, knee functions, and isokinetic muscle strength of patients who underwent ACL reconstruction with hamstring tendon (HT) and bone–tendon–bone (BTB) autografts. Total 40 patients with ACL reconstruction (20 in HT group and 20 in BTB group), at least 1 year after the operation, all injured during sports activity were included in this study. Flexor and extensor muscle groups of both affected and unaffected knees at angular velocities of 60 and 180 degrees/s were recorded. Lysholm knee score questionnaire and Short Form (SF)-36 were administered to all patients before the isokinetic tests. No statistically significant differences were found between the groups at any angular velocity in isokinetic evaluation. Furthermore, there was no statistically significant difference between the groups in regard to Lysholm score. However, there was a statistically significant difference between the groups in SF-36 physical function domain score (p < 0.01). The results demonstrated that the SF-36 questionnaire can easily be applied to this patient population. There was only one significant difference in the SF-36 physical function component scores between the two groups. The quality of life, knee functions, and isokinetic muscle strength were similar in patients who underwent ACL reconstruction with HT and BTB.
Does Treatment with Dexmedetomidine Intra-articularly Improve Postoperative Pain and Rehabilitation after Anterior Cruciate Ligament Reconstruction?
Authors: Ülgey Ayşe , Bayram Adnan , Aksu Recep , Altuntaş Resul , Güney Ahmet , Güler Gülen
Published: May 2021

This study aims to evaluate the analgesic efficacy of dexmedetomidine added to levobupivacaine following anterior cruciate ligament (ACL) surgery. Fifty patients undergoing ACL reconstruction were included. Group DL (dexmedetomidin-levobupivacaine) received 20 mL 0.5% levobupivacaine plus 1 mL (100 μg) dexmedetomidine. Group L (levobupivacaine) patients received 20 mL 0.5% levobupivacaine plus 1 mL saline 10 minutes before tourniquet release. A patient-controlled analgesia (PCA) pump was then connected, delivering 0.5 mg at every 10 minutes and 1-mg morphine and 75-mg diclofenac sodium was used as a rescue analgesic. Postoperative pain was evaluated 0, 2, 4, 6, 12, and 24 hours after extubation at rest and during movement. A rehabilitation program was started after surgery. Postoperative continuous passive motion (CPM) starting time, postoperative leg flexion angle, and straight leg lifting time were evaluated for each group. There were no significant differences between the groups in terms of demographic data and operation time. Morphine consumption, analgesic requirements, and visual analogue scale (VAS) assessments were significantly lower in group DL during the 24-hour period after surgery. The time to start CPM in the postoperative period was significantly shorter in group DL. Passive joint flexion angle was significantly higher in group DL. Postoperative straight leg lifting time was significantly shorter in group DL. Adding dexmedetomidine to the intra-articular levobupivacaine provided better postoperative pain control and improved rehabilitation period after ACL surgery.
Chronic Epidural Hematoma: Still a Rare Entity?
Authors: Banga Manpreet Singh , Sandeep B. V. , Dixit Sourabh
Published: May 2021

Introduction Extradural hematoma diagnosed more than 14 days after head injury is classified as a chronic extradural hematoma (CEDH). In the present study, we presented a series of 8 patients with CEDH in a span of 6 months.

Materials and Methods In this article, we reported 8 cases of CEDH who presented to Nil Ratan Sircar Medical College, Kolkata, West Bengal, India, within a span of 6 months.

Discussion Extratemporal epidural hematomas (EDHs) are often due to venous bleeding from the diploic veins or dural sinuses or to delayed rupture of a middle meningeal pseudoaneurysm. In these cases, cerebrospinal fluid may redistribute from the lateral ventricles and thus allowing room for the enlarging hematoma producing vague neurological symptoms and signs. The incidence rate of CEDH reported in the literature ranges from 3.9 to 30% of all EDHs. Computed tomography (CT) scan in CEDH often shows a low-density center surrounded by a high-density margin. Calcification of the displaced dura mater may also occur. Some are identified incidentally, whereas others are diagnosed when investigating for persistent and/or progressive neurological symptoms. Symptomatic CEDH should be surgically evacuated and has an excellent outcome the earlier it is done. In patients with no or mild symptoms, normal neurological status, and a small-sized CEDH spontaneous resolution may be expected.

Conclusion In the post-CT era, it is always said that CEDH is a rare entity. However, in developing countries we still encounter a large number of such cases and the question arises whether CEDH is still a rare entity.
Endoscopic Management of Gastroparesis
Authors: Seeras Kevin , Docimo Salvatore
Published: May 2021

Gastroparesis is a complex pathology that continues to evolve in its diagnosis and treatment. Throughout the years, we have gained a more thorough understanding of normal and pathologic physiology of the stomach, which has allowed us to garner different approaches to the treatment of gastroparesis. We aim to evaluate the current literature regarding diagnosis and treatment of gastroparesis with a specific focus on the endoscopic management of this pathology.
Barchan dune shapes almost always the same
Authors: Ishimaru Matthew
Published: May 2021

In crescent shaped dunes known as barchans, different grain properties lead to changes in particle distribution within dunes without affecting overall morphology.
Adoption of reinforcement learning for the intelligent control of a microfluidic peristaltic pump
Authors: Abe Takaaki , Oh-hara Shinsuke , Ukita Yoshiaki
Published: May 2021

We herein report a study on the intelligent control of microfluidic systems using reinforcement learning. Integrated microvalves are utilized to realize a variety of microfluidic functional modules, such as switching of flow pass, micropumping, and micromixing. The application of artificial intelligence to control microvalves can potentially contribute to the expansion of the versatility of microfluidic systems. As a preliminary attempt toward this motivation, we investigated the application of a reinforcement learning algorithm to microperistaltic pumps. First, we assumed a Markov property for the operation of diaphragms in the microperistaltic pump. Thereafter, components of the Markov decision process were defined for adaptation to the micropump. To acquire the pumping sequence, which maximizes the flow rate, the reward was defined as the obtained flow rate in a state transition of the microvalves. The present system successfully empirically determines the optimal sequence, which considers the physical characteristics of the components of the system that the authors did not recognize. Therefore, it was proved that reinforcement learning could be applied to microperistaltic pumps and is promising for the operation of larger and more complex microsystems.
Hybrid assemblies of octagonal C and BN monolayers and their electronic properties
Authors: Gaikwad Prashant Vijay , Kshirsagar Anjali
Published: May 2021

Two-dimensional materials and their assemblies have attracted considerable attention due to their versatile properties for various applications. Among them, recently proposed octagonal monolayers (o-MLs) of C and BN are investigated for thermal, dynamical, and energetic stability. These robust o-MLs are then probed for patterned hybrid assemblies due to inherent low lattice mismatch and metallic and wide bandgap insulator combination to study their electronic structure for applications. Carbon substitution in boron nitride in the form of eight membered rings is found to be stable, and the variation of the substituted rings in the patterned hybrid o-MLs changes the structure from an insulating phase to a metallic phase. Such predicted structures may provide impetus for their practical realization.
Development of Faraday rotation measurements on Keda Reconnection eXperiment (KRX) device
Authors: Liu D. K. , Ding W. X. , Mao W. Z. , Zhang Q. F. , Fan F. B. , Sang L. L. , Lu Q. M. , Xie J. L.
Published: May 2021

The Faraday-effect based polarimeter and interferometer are developed for non-perturbation magnetic field and density measurements on the Keda Reconnection eXperiment (KRX) device. The magnetic reconnection is externally driven by a pair of parallel current plates. To design this instrument and provide an alternative way to facilitate theory–experiment comparisons via forward modeling of the diagnostics process with full plasma dynamics given by simulation, we develop a synthetic diagnostics based on 2D photonic integrated circuit simulation for magnetic reconnection on the KRX. The view-line geometry is optimized and wavelengths (1 mm) of the polarimeter and interferometer are selected to ensure the sensitivity of measurement on the KRX. We have simulated magnetic reconnection on the x-line (x–z plane) with horizontal viewing and vertical viewing for line of sight measurements. It is found that the current sheet width and indicator of magnetic reconnection can be inferred directly from the dynamics of Faraday rotation even with the line-integrated character of polarimeter–interferometer diagnostics.
The mechanical characteristics and control of high temperature superconducting magnetic docking mechanism
Authors: Zhang Mingliang , Yu Deshui , Deng Zigang , Liu Pengfei , Niu Jiangchuan , Yu Zhiqiang , Liu Yingshuo , Xu Xinyang
Published: May 2021

The space docking mechanism is one of the important ways to set up a space station, which is an important platform to explore the space. The traditional docking mechanism has achieved a series of docking missions, but it has the problems of large impact and plume pollution, which has the risk to affect the normal work of high precise instrument and equipment installed on spacecraft. In order to solve the drawback of the traditional docking mechanism, the high temperature superconducting magnetic docking mechanism (a novel docking mechanism) consisting of a high temperature superconductor (HTS) bulk installed on a target spacecraft module and an electromagnet installed on a tracking spacecraft module is proposed to be designed based on the flux pinning effect of a HTS. The diamagnetic and trapped magnetic field characteristics of a HTS can be considered to propose an equivalent method of processing HTS (equivalent processing method). Moreover, the equivalent processing method is verified by way of experiment. The mechanical characteristics of the high temperature superconducting magnetic docking mechanism in the case of different parameters are studied using the equivalent processing method. Based on the mechanical characteristics, the dynamic model of the novel docking mechanism is established in order to analyze the dynamic response in the case of different control laws. Furthermore, the docking performance of the high temperature superconducting magnetic docking mechanism is evaluated based on three indicators, that is, maximum overshoot, peak time, and adjustment time.
Ultrahigh sensitive transient absorption spectrometer
Authors: Li Huang , Hu Gang , Li Bo-Han , Zeng Wen , Zhang Jingquan , Wang Xingan , Zhou Chuanyao , Ren Zefeng , Yang Xueming
Published: May 2021

Transient absorption (TA) spectroscopy is considered as a powerful technique that reflects the ultrafast dynamics of photogenerated carriers in photoelectric and photocatalysis materials. However, limited by its sensitivity, the photogenerated carrier density in TA measurements of solar energy materials is usually much higher than that in the real working condition. Here, we present a combination of kHz macro-pulse and MHz micro-pulse technique for an ultrahigh sensitive TA spectrometer, which improves the sensitivity to the 10−7 level of ΔOD. It enables us to study ultrafast carrier dynamics pumped by very low power, which can avoid the influence of many-body interactions and the nonlinear effect associated with high carrier density. This work provides a novel TA method with ultrahigh sensitivity, which will play an important role in investigating the carrier dynamics of semiconductors in the working condition.
Metallic ferromagnetic selenospinel composites of CuCr2Se4–CdCr2Se4 with double negative electromagnetic parameters
Authors: Yin Feng , Yan Kelan , Shen Liming , Bao Ningzhong
Published: May 2021

Random metamaterial with negative electric permittivity (ε < 0) and negative magnetic permeability (μ < 0) is a group of attractive alternatives to ordered double negative metamaterials (DNMs) with periodic unit cells; however, the preparation of random DNMs with a relatively convenient preparation process and their electromagnetic property adjustment are of challenge. Here, we report the preparation of metallic ferromagnetic selenospinel composites, xCdCr2Se4·(1−x)CuCr2Se4, from metallic powders by using a simple solid-state reaction process, and double negative ε and μ have been observed in the frequency range of 120–650 MHz for 0.2CdCr2Se4·0.8CuCr2Se4 and 73–520 MHz for 0.4CdCr2Se4·0.6CuCr2Se4. The negative ε is owing to the plasmonic state of delocalized carriers in the metallic ferromagnetic CuCr2Se4, which can be described with the Drude model. The suppression of the magnetic resonance induced by the eddy current has been alleviated by the proper addition of the paramagnetic semiconductor CdCr2Se4. A theoretical model deduced from Maxwell's equation has been constructed based on the skin effect to elucidate the magnetic resonance-dependent negative permeability. Our work introduces the metallic ferromagnetic chalcospinels into the field of random DNMs and sheds light on the theoretical understanding and tuning mechanism on the double negative properties.
A kernel-modulated SIR model for Covid-19 contagious spread from county to continent
Authors: Geng Xiaolong , Katul Gabriel G. , Gerges Firas , Bou-Zeid Elie , Nassif Hani , Boufadel Michel C.
Published: May 2021

Significance

Spatial analysis of daily Covid-19 cases at the US county scale revealed a dynamic multifractal scaling of infections, spanning from 10 to 2,600 km and consistently trending toward that of the susceptible population. A susceptible–infected–recovered model was expanded to include spatial spread across counties using a spatial kernel. The reproduction number
R
b
(average number of persons infected by an infected person) decreased because of interventions (masks, social distancing). The model shows that reducing
R
b
in isolation is not sufficient to stem the spread of the disease and concomitant measures such as curfews and lockdowns may be needed. The
R
b
of 2.0 estimated here in July to October 2020 is large, hinting at super-spreaders and super-spreader events.
Crosslinguistic influence on L2 implicature computation for determiners
Authors: Cho Jacee
Published: May 2021

This paper explores the extent to which L1-Korean L2-English speakers’ L1 influences the computation of
conversational implicatures for the definite and demonstrative determiners the and that in
English. Both the and that denote unique referents, but that carries
implication of contrast (Roberts, 2002). Following Submaxim 2 of the Gricean Quantity
Maxim, using that instead of unmarked the implicates that the referent is being implicitly
contrasted with other members of the same noun. Korean has no equivalent for the and the demonstrative
ku ‘that’ is situated on the semantic scale between the and that. This
partial overlap could influence L1-Korean L2-English speakers’ implicature computation even though ku also
carries implication of contrast. Acceptability judgment data indicate that unlike native speakers, L2 speakers did not show
sensitivity to infelicitous use of that, indicating difficulty computing implicatures. Results are discussed in
terms of crosslinguistic influence at the semantics-pragmatics interface in L2 acquisition.
Lysosome biogenesis: Regulation and functions
Authors: Yang Chonglin , Wang Xiaochen
Published: May 2021

Lysosomes are degradation centers and signaling hubs in cells and play important roles in cellular homeostasis, development, and aging. Changes in lysosome function are essential to support cellular adaptation to multiple signals and stimuli. Therefore, lysosome biogenesis and activity are regulated by a wide variety of intra- and extracellular cues. Here, we summarize current knowledge of the regulatory mechanisms of lysosome biogenesis, including synthesis of lysosomal proteins and their delivery via the endosome–lysosome pathway, reformation of lysosomes from degradative vesicles, and transcriptional regulation of lysosomal genes. We survey the regulation of lysosome biogenesis in response to nutrient and nonnutrient signals, the cell cycle, stem cell quiescence, and cell fate determination. Finally, we discuss lysosome biogenesis and functions in the context of organismal development and aging.
Constrained chromatin accessibility in PU.1-mutated agammaglobulinemia patients
Authors: Le Coz Carole , Nguyen David N. , Su Chun , Nolan Brian E. , Albrecht Amanda V. , Xhani Suela , Sun Di , Demaree Benjamin , Pillarisetti Piyush , Khanna Caroline , Wright Francis , Chen Peixin Amy , Yoon Samuel , Stiegler Amy L. , Maurer Kelly , Garifallou James P. , Rymaszewski Amy , Kroft Steven H. , Olson Timothy S. , Seif Alix E. , Wertheim Gerald , Grant Struan F.A. , Vo Linda T. , Puck Jennifer M. , Sullivan Kathleen E. , Routes John M. , Zakharova Viktoria , Shcherbina Anna , Mukhina Anna , Rudy Natasha L. , Hurst Anna C.E. , Atkinson T. Prescott , Boggon Titus J. , Hakonarson Hakon , Abate Adam R. , Hajjar Joud , Nicholas Sarah K. , Lupski James R. , Verbsky James , Chinn Ivan K. , Gonzalez Michael V. , Wells Andrew D. , Marson Alex , Poon Gregory M.K. , Romberg Neil
Published: May 2021

The pioneer transcription factor (TF) PU.1 controls hematopoietic cell fate by decompacting stem cell heterochromatin and allowing nonpioneer TFs to enter otherwise inaccessible genomic sites. PU.1 deficiency fatally arrests lymphopoiesis and myelopoiesis in mice, but human congenital PU.1 disorders have not previously been described. We studied six unrelated agammaglobulinemic patients, each harboring a heterozygous mutation (four de novo, two unphased) of SPI1, the gene encoding PU.1. Affected patients lacked circulating B cells and possessed few conventional dendritic cells. Introducing disease-similar SPI1 mutations into human hematopoietic stem and progenitor cells impaired early in vitro B cell and myeloid cell differentiation. Patient SPI1 mutations encoded destabilized PU.1 proteins unable to nuclear localize or bind target DNA. In PU.1-haploinsufficient pro–B cell lines, euchromatin was less accessible to nonpioneer TFs critical for B cell development, and gene expression patterns associated with the pro– to pre–B cell transition were undermined. Our findings molecularly describe a novel form of agammaglobulinemia and underscore PU.1’s critical, dose-dependent role as a hematopoietic euchromatin gatekeeper.
Highly responsive ZnO nanorods array ultraviolet photodetectors modificated with reduced graphene oxide layer
Authors: Jiang Jing , Luo Guangcan , Zhang Ziling , Tan Bo , Guo Xuxiang , Li Wei , Zhang Jingquan
Published: May 2021

In this paper, we demonstrate a new heterojunction ultraviolet (UV) photodetector in a superstrate configuration, i.e. glass/FTO/ZnO NRs/rGO/Au, constructed via the dip-coated method to form reduced graphene oxide (rGO) layer on the surface of ZnO nanorod arrays (NRs). The rGO compensates for surface oxygen vacancies by the oxygen-containing groups and improves the crystal properties of ZnO NRs after annealing. Furthermore, the carrier mobility and work function are effectively increased after Au doping. Under UV irradiation, the electron–hole pairs generated by ZnO NRs are separated with bias voltage, and the electrons and holes are collected via fluorine-doped tin dioxide (FTO) and rGO/Au, respectively. The rGO acts as a hole transport layer, which reduces the recombination of carriers and increases the current density, giving rise to a higher responsivity (67.48 A W−1 at −1.5 V bias) than pure ZnO NRs photodetectors.