bluuebunny/crossref_metadata_2025 huggingface dataset:
In vitro screening of rhizospheric Aspergillus strains for potassium solubilization from Maharashtra, India
Authors: Gore Nileema S. , Navale Annasaheb M.
Published: August 2021

The biggest proportions of K in soil are insoluble minerals and other deposits. Microorganisms play a central role in the natural K cycle and it solubilize by microorganisms through the produc on of acids and it will be available for plant. Their use in agriculture can favor a reduc on in agro-chemical use and support ecofriendly crop production. In the present study, among the nineteen isolates, three fungal isolates from the rhizosphere soils of Maharashtra, India has been found promising solubilizers of potash mineral (Mica). The amount of potassium released from muscovite mica by the isolate (potassium solubilizing fungi) KSF 3 (334.66 mgl-1) at 10 days after incubation, recorded the highest potassium solubilization than control showed 42.81 mgl-1. The significant reduction in pH of the medium of initially adjusted pH of 7.0 i.e. pH 3.80 was recorded by isolating KSF 3. Based on the colonial morphology and microscopic appearance, the selected three efficient fungi were identified as Aspergillus spp. Among all isolates, KSF 3 was showed highest zone of solubilization of potassium from KCl, 50.00 mm followed by KSF 13 (49.63 mm from K2SO4) and KSF 13 (49.33 mm from KCl). There is need of bioactivation of soil K reserves as well as applied K-bearing minerals so as to alleviate the potash fertilizer storage in India. Therefore, the application of potassium solubilizing fungi is a promising approach for increasing K availability in soils.
Hydrodynamics of Small Transient Brightenings in the Solar Corona
Authors: Rajhans Abhishek , Tripathi Durgesh , Kashyap Vinay L.
Published: August 2021

Small scale transients occur in the solar corona at much higher frequencies than flares and play a significant role in coronal dynamics. Here we study three well-identified transients discovered by Hi-C and also detected by the EUV channels of the Atmospheric Imaging Assembly (AIA) on board the Solar Dynamics Observatory. We use 0D enthalpy-based hydrodynamical simulations and produce synthetic light curves to compare with AIA observations. We have modeled these transients as loops of ∼1.0 Mm length depositing energies ∼1023 erg in ∼50 s. The simulated synthetic light curves show reasonable agreement with the observed light curves. During the initial phase, conduction flux from the corona dominates over the radiation, like impulsive flaring events. Our results further show that the time-integrated net enthalpy flux is positive, hence into the corona. The fact that we can model the observed light curves of these transients reasonably well by using the same physics as those for nanoflares, microflares, and large flares, suggests that these transients may have a common origin.
Measuring the Magnetic Origins of Solar Flares, Coronal Mass Ejections, and Space Weather
Authors: Judge Philip , Rempel Matthias , Ezzeddine Rana , Kleint Lucia , Egeland Ricky , Berdyugina Svetlana V. , Berger Thomas , Bryans Paul , Burkepile Joan , Centeno Rebecca , de Toma Giuliana , Dikpati Mausumi , Fan Yuhong , Gilbert Holly , Lacatus Daniela A.
Published: August 2021

We take a broad look at the problem of identifying the magnetic solar causes of space weather. With the lackluster performance of extrapolations based upon magnetic field measurements in the photosphere, we identify a region in the near-UV (NUV) part of the spectrum as optimal for studying the development of magnetic free energy over active regions. Using data from SORCE, the Hubble Space Telescope, and SKYLAB, along with 1D computations of the NUV spectrum and numerical experiments based on the MURaM radiation–magnetohydrodynamic and HanleRT radiative transfer codes, we address multiple challenges. These challenges are best met through a combination of NUV lines of bright Mg ii, and lines of Fe ii and Fe i (mostly within the 4s–4p transition array) which form in the chromosphere up to 2 × 104 K. Both Hanle and Zeeman effects can in principle be used to derive vector magnetic fields. However, for any given spectral line the τ = 1 surfaces are generally geometrically corrugated owing to fine structure such as fibrils and spicules. By using multiple spectral lines spanning different optical depths, magnetic fields across nearly horizontal surfaces can be inferred in regions of low plasma β, from which free energies, magnetic topology, and other quantities can be derived. Based upon the recently reported successful sub-orbital space measurements of magnetic fields with the CLASP2 instrument, we argue that a modest space-borne telescope will be able to make significant advances in the attempts to predict solar eruptions. Difficulties associated with blended lines are shown to be minor in an Appendix.
La pandémie du covid-19 et son impact économique sur le secteur privé de l’enseignement supérieur au Congo Brazzaville
Authors: Makany Luyindula G. Davy , Batchi Macaire , Makany Roger Armand
Published: August 2021

Les établissements publics et privés d’enseignement supérieur ont été fermés par le gouvernement le 19 mars 2020 suite à l’apparition le 18 mars 2020 au Congo du 3 ème cas de contamination du covid-19. Bien qu’étant en concurrence, ces établissements ont mis en œuvre une stratégie de coopétition en vue d’obtenir du gouvernement la décision de la reprise de leurs activités. Les établissements privés d’enseignement supérieur (EPRES) n’ont malheureusement pas bénéficié de la moindre mesure d’accompagnement de l’État. Une enquête menée auprès des 38 EPRES à partir d’un questionnaire a mis en lumière au moyen de la méthode statistique de l’analyse en composantes principales que les deux charges déterminantes caractérisant l’impact économique sont les charges des gestes barrières puis les charges fixes. Le plan factoriel principal a permis de construire des typologies des EPRES décrivant leur positionnement par rapport à l’impact économique qu’ils ont subi.
Impact des variations du prix international du pétrole sur la croissance économique au Cameroun
Authors: Saha Jean Claude , Moussa Elhadji Saidou
Published: August 2021

Nous décomposons d’abord les variations des recettes d’exportation du pétrole du Cameroun en deux parts : l’une due aux variations du prix et l’autre due aux variations des quantités. Nous trouvons que de 1985 à 2015, 140,171 % des variations des recettes pétrolières sont dues aux variations du prix et -40,171 % aux variations des quantités. Ensuite, l’estimation d’un modèle économétrique ADRL révèle que ces variations, dues au prix, influencent positivement la croissance. Le Cameroun gagnerait à au moins stabiliser sa production du pétrole afin de se mettre à l’abris des conséquences négatives des baisses de recettes dues aux baisses de prix et d’être capable de tirer le maximum de profit des variations positives des recettes dues aux hausses du prix du pétrole.
Global boundedness of radial solutions to a parabolic-elliptic chemotaxis system with flux limitation and nonlinear signal production
Authors: Yi Hong , Mu Chunlai , Qiu Shuyan , Xu Lu
Published: August 2021

The following degenerate chemotaxis system with flux limitation and nonlinear signal production

   \begin{document}$ \begin{equation*} \begin{cases} u_t = \nabla\cdot(\frac{u\nabla u}{\sqrt {u^{2}+|\nabla u|^{2}}})-\chi\nabla\cdot(\frac{u\nabla v}{\sqrt {1+|\nabla v|^{2}}}) \quad &in\quad B_{R}\times(0, +\infty), \\ 0 = \Delta v-\mu (t)+u^{\kappa}, \quad \mu(t): = \frac{1}{|\Omega|}\int_{\Omega}u^{\kappa}(\cdot, t) \quad &in\quad B_{R}\times(0, +\infty) \end{cases} \end{equation*} $\end{document}

is considered in balls \begin{document}$ B_R = B_R(0)\subset \mathbb{R}^n $\end{document} for \begin{document}$ n\geq 1 $\end{document} and \begin{document}$ R>0 $\end{document} with no-flux boundary conditions, where \begin{document}$ \chi>0, \kappa>0 $\end{document}. We obtained local existence of unique classical solution and extensibility criterion ruling out gradient blow-up, and moreover proved global existence and boundedness of solutions under some conditions for \begin{document}$ \chi, \kappa $\end{document} and \begin{document}$ \int_{B_R}u_{0} $\end{document}.
Strategies and Implementation Paths for Curriculum Setting of Digital Media Major in the Digital Age
Authors: Zhou Zhiqi , Dong Bo
Published: August 2021

The professional courses of digital media major face several problems: too many influencing factors, unclear implementation strategy, and difficulty in evaluating the implementation effect. To solve these problems, this paper explores strategies and implementation paths for the professional courses of digital media major in the digital age. Firstly, the essential elements in curriculum setting were discussed, and the symptoms of the relevant problems were summarized; On this basis, the authors derived detailed strategies for the curriculum setting of digital media major. To ensure the effectiveness and reasonability of the professional courses of digital media major, an evaluation system and an evaluation model were constructed for judging the implementation effect of these courses. The research provides a strong support for the smooth implementation of the designed professional courses of digital media major, and a good reference for theorists and engineers in the relevant fields.
A Conceptual Framework to Aid Attribute Selection in Machine Learning Student Performance Prediction Models
Authors: Khan Ijaz Muhammad , Ahmad Abdul Rahim , Jabeur Nafaa , Mahdi Mohammed Najah
Published: August 2021

One of the important key applications of learning analytics is offering an opportunity to the institutions to track the student’s academic activities and provide them with real-time adaptive consultations if the student academic performance diverts towards the inadequate outcome. Still, numerous barriers exist while developing and implementing such kind of learning analytics applications. Machine learning algorithms emerge as useful tools to endorse learning analytics by building models capable of forecasting the final outcome of students based on their available attributes. The machine learning algorithm’s performance demotes with using the entire attributes and thus a vigilant selection of predicting attributes boosts the performance of the produced model. Though, several constructive techniques facilitate to identify the subset of productive attributes, however, the challenging task is to evaluate if the prediction attributes are meaningful, explicit, and controllable by the students. This paper reviews the existing literature to come up with the student’s attributes used in developing prediction models. We propose a conceptual framework which demonstrates the classification of attributes as either latent or dynamic. The latent attributes may appear significant but the student is not able to control these attribute, on the other hand, the student has command to restrain the dynamic attributes. Each of the major class is further categorized to present an opportunity to the researchers to pick constructive attributes for model development.
3D Polygon Mesh Encryption Based on 3D Lorenz Chaotic Map
Authors: Alsalam Ali Nashwan , S. Rahma Abdul Monem , H. Shaker Shaimaa
Published: August 2021

The multimedia application developments in recent years lead to the widespread of 3D model applications. It becomes more popular in various fields as well as exchanging it over the internet. The security of the 3D models is a very important issue now a day, so the scheme for encrypting the 3D model will be proposed in this work. In this proposed scheme, the 3D polygon mesh model will be protected through the encrypting process based on a 3D Lorenz Chaotic map where the vertices value of the 3D polygon mesh model will be modified using 3D keys generated by 3D Lorenz Chaotic Map, which has excellent property and provides a good diffusion. The proposed scheme was implemented on various 3D models, which have a different number of vertices and faces. The experimental results show that the proposed scheme has good encryption results, which were noted through completely deforming and changing the whole shape of the 3D models. The Hausdorff Distance (HD) and histogram metrics are adopted to calculate the matching degree between the original and extracted model. The results show that the original and extracted model are identical through the values of HD, where they are approximately zero, and the histogram visually is identical.    
Determinants of Consumption Behaviors of Korean Pop Culture in Taiwan
Authors: Lee Sunmi , Wu Chien-Hsing
Published: August 2021

This paper presents a qualitative analysis of associations between intrinsic (e.g., functional), extrinsic (e.g., social) and cultural consumption values, and consumption behavior of Korean pop cultural contents (KPCC) in Taiwan. Moderation effects of Korean language abilities on associations are also investigated. Results show that intrinsic consumption value has the strongest association with KPCC consumption behaviors. Functional, epistemic, and conditional values have strong associations, whereas emotional and social exhibit weak associations. Cultural value is not a strong predictor of consuming KPCCs due to Korean and Taiwan cultural characteristics not being substantially different. Language abilities weakly moderate relationships between KPCC consumption values and consumption behaviors. Implications and suggestions are addressed. The research contributes findings and implications to the domain of KPCC marketing and retailing in Taiwan.
Graph Database to Enhance Supply Chain Resilience for Industry 4.0
Authors: Hong Young-Chae , Chen Jing
Published: August 2021

Supply chain network in the automotive industry has complex, interconnected, multiple-depth relationships. Recently, the volume of supply chain data increases significantly with Industry 4.0. The complex relationships and massive volume of supply chain data can cause visibility and scalability issues in big data analysis and result in less responsive and fragile inventory management. The authors develop a graph data modeling framework to address the computational problem of big supply chain data analysis. In addition, this paper introduces Time-to-Stockout analysis for supply chain resilience and shows how to compute it through a labeled property graph model. The computational result shows that the proposed graph data model is efficient for recursive and variable-length data in supply chain, and relationship-centric graph query language has capable of handling a wide range of business questions with impressive query time.
Integrating Mathematical and Simulation Approach for Optimizing Production and Distribution Planning With Lateral Transshipment in a Supply Chain
Authors: Ji Jirasak , Chiadamrong Navee
Published: August 2021

Supply chain planning aims to maximize the chain's profit and find an effective way to integrate production and distribution. A mathematical and simulation-based optimizations are two common disciplines in which this study integrates both of them together to consolidate their advantages. A mathematical model is formulated to find an optimal production-distribution plan. Then, the result is fed into a simulation model operating under uncertainty to verify the feasibility of the plan. Our integrated approach tries to find a feasible plan that satisfies both required customer service level and makespan limitation where safety stock is used to hedge against uncertainties, and lateral transshipment is used for emergency measures against excessive fluctuation of customer demand. A case study that optimizes the profit of an entire chain is used to demonstrate the algorithm. The outcomes of the study show that our proposed approach can yield feasible results (with near or even optimal solution) with much faster computational time as compared to the traditional simulation-based optimization.
The Fluctuating Décor of Youth Identity in Post-Colonial South Africa
Authors: Radebe Jah-Xolani
Published: August 2021

This paper aims to discuss South African youths living in democratic South Africa, it will look critically on the youth definition and, highlight a brief outlook on the youth and society in the African context. It will look African youths as centre of social interfaces and revolution, due to their role in in different structures, culture, sacraments, and social movement. Moreover, it will examine the Born Free generation is an attempt to trigger a dialogue necessary to challenge youth identity crises, youth disparities in education, housing, health care and employment opportunities. Lastly, this paper will look closer on conditions facing young Blacks in today’s South Africa in relation to identity crisis, challenges and opportunities of today’s youths.
Review of Cross-Border E-Commerce and Directions for Future Research
Authors: Hazarika Bidyut B. , Mousavi Reza
Published: August 2021

The emergence of Cross-Border E-commerce (CBeC) has brought substantial changes to both businesses and consumers. Although CBeC businesses have existed for less than a decade, many academic researchers addressed important issues in this context. It is essential to evaluate what has been studied through a structured review of the literature and derive meaningful insights given that research on this topic is new and largely fragmented. Therefore, this study conducts a review of CBeC literature to find the current gaps and fragmentation to provide guidelines for future research. The review shows that research in this domain needs more attention and enforcement to address the current research gaps. Addressing the current gaps helps academia build a rigorous body of knowledge and enables practitioners to solve challenging business problems.
The Impact of Risk-Aware Consumer Trust on CB E-Commerce Platforms and Purchase Intention
Authors: Sun Yi , Li Yunrong
Published: August 2021

Cross-border e-commerce(CBRC) is increasingly affecting the value of traditional trade due to its rich variety, convenient operation, and free of time and space restrictions, and has also changed the consumer's Shopping habits. However, the development of CBEC still faces many problems, resulting in domestic consumers' willingness to consume on CBEC platforms is not high. Based on the above background, the research content of this paper is the influence of consumer trust on purchase intention based on perceived risk of CBEC platforms. In this paper, a questionnaire survey is used to collect data for simulation. The results show that from the regression results of the five dimensions of trust on purchase intention, the adjusted R2 is 0.466, indicating a high degree of fit. When the exploratory value in perceived promotional gains is high, it will leave consumers in an irrational state and weaken the perception of risk.
Empirical Study on the Influencing Factors of WeChat Business Integrity
Authors: Xiao Yangling , Tong Bingjun , Sheng Yanmei , Cui Mingxin
Published: August 2021

With the increasing popularity of the smart phones and electronic payment, WeChat shopping has become a trendy lifestyle for many people. However, the issue of WeChat business integrity has gradually appeared due to the virtuality of the Internet. This paper analyzed the development of WeChat business and its business integrity. The influencing factors of WeChat business integrity and related hypotheses had been studied based on theoretical and practical analysis. The reliability and validity of the data collected through questionnaires were tested with SPSS24.0. Empirical analysis was done to the hypotheses by using the structural equation model. The results indicated that products and service quality, after-sale guarantee, payment security and Word-of-mouth had a prominent positive effect on the integrity of WeChat business.
Information Usefulness and Attitude Formation a Double-Dependent Variable Model (DDV) to Examine the Impacts of Online Reviews on Consumers
Authors: Lu Jinting , Bai Haiqing
Published: August 2021

With the popularity of online shopping, a large body of studies have paid much attention to the factors influencing consumers’ information seeking and assessing. However, theoretical development and empirical testing are still not enough to explain this phenomenon, that is, during the information seeking and assessing process, what factor play a decisive role is a question needed to be deeply explored. This study, thus, aim to understand the impact of the attributes of online reviews on consumer. In addition, we find that review volume (RV: a heuristic factor) have direct impacts on perceived usefulness (PU) and attitudes (ATT), while source credibility (SC: another heuristic factor) only influences the perceived usefulness (PU), but no effects on attitudes (ATT). As for the moderating effects, perceived social-psychological risk (PSR) moderates the effects of both reviews volume (RV) and source credibility (SC) on perceived usefulness and attitudes. We explored the reasons underlying those findings , and also discuss implications for both researchers and practitioners.
Impact of Board Structure Characteristics on Financial Performance: Evidence from Selected Listed Companies in Colombo Stock Exchange
Authors: Fernando W. N. S. , Weligamage S. S.
Published: August 2021

This study examines the impact of board structure characteristics on financial performance and the contribution of the code of best practices on corporate governance in determining board effectiveness. This study investigates whether board structure characteristics impact financial performance, as measured by Earning Per Share (EPS) and Return on Assets (ROA). Independent variables are board size, Board Meetings, Board Composition, Independent Board Committees, and Board Shareholding. Fifty companies listed in Colombo Stock Exchange (CSE) from 16 sectors were selected as sample size based on the turnover of the year 2019 for the period of 2017 to 2019. The data were analyzed using descriptive statistics, correlation analysis, and multiple regression analysis. According to the data analysis findings, this study found that the board structure characteristics significantly affect EPS and do not affect ROA. Findings also revealed that board size, board composition, board shareholdings indicators significantly impact EPS and board composition, and board shareholdings negatively affect the EPS. This study has provided useful information mainly to the PLCs in Sri Lanka in terms of the importance of compliance with the code of best practice on corporate governance toward enhancing board structure characteristics.
The Impact of Sustainability Reporting on Firms’ Financial Performance
Authors: Thayaraj M. S. , Karunarathne W. V. A. D.
Published: August 2021

This research investigates the impact of Sustainability Reporting on Firms' Financial Performance: Special Reference to the Listed Companies in the Colombo Stock Exchange in Sri Lanka. The study evaluates the impact of economic, environmental, and social disclosures as the sustainability reporting on the firm's financial performance, including Listed Companies in Sri Lanka. It was able to identify the level of disclosures on sustainability performance is lower than the expectation and compare foreign listed entities. As the sustainability disclosure is not a mandatory part to be provided in annual reports and voluntarily disclosing the performances are very low. Thus, 102 listed companies with Sustainability reporting of selected for the analysis purpose from 138 listed companies. All these companies follow the Global Reporting Initiative (GRI) G4 guidelines. This study considers secondary data collected from the annual reports, both from the Financial and Non-Financial reporting. The descriptive analysis, correlation tests, and regression analysis have conducted for analyzing purposes. The findings show a moderate positive relationship between the sustainability reporting, including economic, environmental, and social disclosures and ROA on financial performance. Thus, the consideration either on sustainability performance or on financial performance a company can achieve a moderate positive vibe of the year.
IL-33 Induces Sema4A Expression in Dendritic Cells and Exerts Antitumor Immunity
Authors: Suga Yasuhiko , Nagatomo Izumi , Kinehara Yuhei , Koyama Shohei , Okuzaki Daisuke , Osa Akio , Naito Yujiro , Takamatsu Hyota , Nishide Masayuki , Nojima Satoshi , Ito Daisuke , Tsuda Takeshi , Nakatani Takeshi , Nakanishi Yoshimitsu , Futami Yu , Koba Taro , Satoh Shingo , Hosono Yuki , Miyake Kotaro , Fukushima Kiyoharu , Shiroyama Takayuki , Iwahori Kota , Hirata Haruhiko , Takeda Yoshito , Kumanogoh Atsushi
Published: August 2021

Cancer immunotherapy has shown great promise as a new standard therapeutic strategy against cancer. However, the response rate and survival benefit remain unsatisfactory because most current approaches, such as the use of immune checkpoint inhibitors, depend on spontaneous antitumor immune responses. One possibility for improving the efficacy of immunotherapy is to promote antitumor immunity using adjuvants or specific cytokines actively. IL-33 has been a candidate for such cytokine therapies, but it remains unclear how and in which situations IL-33 exerts antitumor immune effects. In this study, we demonstrate the potent antitumor effects of IL-33 using syngeneic mouse models, which included marked inhibition of tumor growth and upregulation of IFN-γ production by tumor-infiltrating CD8+ T cells. Of note, IL-33 induced dendritic cells to express semaphorin 4A (Sema4A), and the absence of Sema4A abolished the antitumor activity of IL-33, indicating that Sema4A is intrinsically required for the antitumor effects of IL-33 in mice. Collectively, these results not only present IL-33 and Sema4A as potential therapeutic targets but also shed light on the potential use of Sema4A as a biomarker for dendritic cell activation status, which has great value in various fields of cancer research, including vaccine development.
Protein Immunization Induces Memory CD4+ T Cells That Lack Th Lineage Commitment
Authors: Sircy Linda M , Harrison-Chau Malia , Novis Camille Leite , Baessler Andrew , Nguyen Jacklyn , Hale J Scott
Published: August 2021

Acute viral infection generates lineage-committed Th1 and T follicular helper (Tfh) memory cells that recall their lineage-specific functions following secondary challenge with virus. However, the lineage commitment of effector and memory Th cells in vivo following protein vaccination is poorly understood. In this study, we analyzed effector and memory CD4+ T cell differentiation in mice (Mus musculus) following adjuvanted glycoprotein immunization compared with acute lymphocytic choriomeningitis virus infection. Glycoprotein immunization induced CXCR5− non-Tfh effector and memory CD4+ T cells that surprisingly had not undergone polarization toward any particular Th cell lineage but had undergone memory differentiation. However, upon challenge with virus, these Th lineage–nonpolarized memory CD4+ T cells were able to generate Th1 secondary effector cells, demonstrating their lineage plasticity. In addition, Tfh and memory Tfh cells were generated in response to protein immunization, and these cells differed from infection-induced Tfh cells by their lack of the transcription factor Tbet. Rechallenge experiments demonstrated that viral infection, but not protein immunization, during either the primary or secondary immune response, restricts the recall of Bcl6 expression and the generation of germinal center Tfh cells. Together, these data demonstrate that protein immunization generates a combination of nonpolarized memory cells that are highly plastic and memory Tfh cells that can undergo further Th1-like modulation during a secondary response to viral infection.
FcRn-Targeted Mucosal Vaccination against Influenza Virus Infection
Authors: Ochsner Susan Park , Li Weizhong , Rajendrakumar Arunraj Mekhemadhom , Palaniyandi Senthilkumar , Acharya Gyanada , Liu Xiaoyang , Wang Gefei , Krammer Florian , Shi Meiqing , Tuo Wenbin , Pauza C David , Zhu Xiaoping
Published: August 2021

The respiratory tract is constantly exposed to various airborne pathogens. Most vaccines against respiratory infections are designed for the parenteral routes of administration; consequently, they provide relatively minimal protection in the respiratory tract. A vaccination strategy that aims to induce the protective mucosal immune responses in the airway is urgently needed. The FcRn mediates IgG Ab transport across the epithelial cells lining the respiratory tract. By mimicking this natural IgG transfer, we tested whether FcRn delivers vaccine Ags to induce a protective immunity to respiratory infections. In this study, we designed a monomeric IgG Fc fused to influenza virus hemagglutinin (HA) Ag with a trimerization domain. The soluble trimeric HA-Fc were characterized by their binding with conformation-dependent HA Abs or FcRn. In wild-type, but not FcRn knockout, mice, intranasal immunization with HA-Fc plus CpG adjuvant conferred significant protection against lethal intranasal challenge with influenza A/PR/8/34 virus. Further, mice immunized with a mutant HA-Fc lacking FcRn binding sites or HA alone succumbed to lethal infection. Protection was attributed to high levels of neutralizing Abs, robust and long-lasting B and T cell responses, the presence of lung-resident memory T cells and bone marrow plasma cells, and a remarkable reduction of virus-induced lung inflammation. Our results demonstrate for the first time, to our knowledge, that FcRn can effectively deliver a trimeric viral vaccine Ag in the respiratory tract and elicit potent protection against respiratory infection. This study further supports a view that FcRn-mediated mucosal immunization is a platform for vaccine delivery against common respiratory pathogens.
Students' perspective on integrated teaching in medical education
Authors: Shrivastava Saurabh RamBihariLal , Shrivastava Prateek Saurabh
Published: August 2021

The concept of integrated teaching in medical education has been advocated to provide meaningful connections between the topics and problems which are interrelated so that understanding between theory and practical application can be ameliorated. The integrated teaching has been associated with multiple advantages for both the teachers and students. However, it is important to explore the educational initiative in terms of the opportunity which it presents to the students, as eventually our aim is to produce a competent medical graduate. However, for the successful implementation of the integrated teaching and accomplishment of the intended learning outcomes, we have to give due consideration for the existing challenges. There are no doubts that challenges exist from the perspective of administrators and from the faculty perspective, but we cannot ignore the potential challenges attributed to the students. In conclusion, integrated teaching has been linked with multiple benefits for the students in the medical education. However, we have to understand the opportunity and the challenges attributed to the same from the students' perspective for better and successful implementation.
Diet and cancer
Authors: Paul Swapan Kumar , Ghosh Amrita , Pal Ranabir , Pal Shrayan
Published: August 2021

Cancer arising out of diets and protective role of diet from cancers to preserve health and nutritional status is a debate in the healthcare arena. In search of perennial conflict on diet and cancer, researchers of this review emphasized conceptual and contextual details from commonly used dietary items and practices for optimum healthcare model. Twenty-four research studies were identified from 91 potentially relevant data bases and published literatures to collate an updated idea of diet and cancer. Studies were selected on, first; all emerging nutritional plans and related reports on cancer among published literature were sketchily searched. Second, “diet” and 'cancer control was also sourced from different journals, conference proceedings, and different media reports, Third, published reports from apex bodies of global importance like different professional national and international organizations were given due weightage. We have assembled diversity of opinion on prevention and control of cancer in different academic sources. Although there is no paucity of quantitative and qualitative data on diet and cancer, there is dearth of scientific and valid suggestions from scholars on this sensitive issue. In a holistic approach, we require more translational research about diet and cancer with definitive and conclusive evidences for day-to-day application in medical practice for the improvement in clinical approach of this complex debatable paradigm.
Cutaneous Metastases in a Case of Adenocarcinoma Cervix with Atypical Presentation
Authors: Arora Sandeep , Dabas Rajeshwari , Ranjan Eeshaan , Rout Aradhana
Published: August 2021

Cutaneous metastasis of carcinoma cervix is quite uncommon, with a reported incidence of 0.1%–4.4%, with zosteriform or dermatomal distribution being a rare presentation. Although zosteriform cutaneous metastases have been reported with other malignancies, namely lung carcinoma, breast carcinoma, and malignant melanoma, there are no reports of dermatomal cutaneous metastases with adenocarcinoma cervix. We report a case of adenocarcinoma cervix who developed cutaneous metastases in an unusual dermatomal distribution mimicking herpes zoster.
Spectrum of Cervical Epithelial Abnormalities in Immune Surveillance Patients and its Association with CD4 Count
Authors: Baveja Puneet , Singh Sharanjit , Yadav Arun Kumar
Published: August 2021

Background:

Cervical cancer is the fourth most common cancer worldwide. It is well-known that cervical carcinoma progresses from a preinvasive disease, which can be picked up easily by routine cervical smear examination. Studies have shown that dysplasia is five times more common in females with human immunodeficiency virus (HIV) than in healthy controls. This study aimed to find if any association existed between CD4 count, viral load, parity, hemoglobin level, age at first childbirth, duration of highly active antiretroviral therapy, and cervical epithelial abnormalities.

Methods:

The present study was a 4-year retrospective study conducted in the Department of Pathology at a tertiary care hospital of Western Maharashtra. The liquid-based Pap smear slides of HIV patients reported during the period were retrieved and reviewed. The data collected were tabulated and analyzed using the SPSS software. Statistical test was used to find an association between various clinicopathological variables and smear findings.

Results:

Pap smear abnormalities were found in 14% of the patients. The present study found a statistically significant association between Pap smear abnormalities and CD4 count, viral load, and the hemoglobin level of the patient.

Conclusion:

There is a high prevalence of Pap smear abnormalities in HIV-positive patients. CD4 count, hemoglobin level, and viral load can be used as surrogate markers for deciding the frequency of Pap smear in HIV patients.
Some results on the Flynn–Poonen–Schaefer conjecture
Authors: Eliahou Shalom , Fares Youssef
Published: August 2021

For
$c \in \mathbb {Q}$
, consider the quadratic polynomial map
$\varphi _c(z)=z^2-c$
. Flynn, Poonen, and Schaefer conjectured in 1997 that no rational cycle of
$\varphi _c$
under iteration has length more than
$3$
. Here, we discuss this conjecture using arithmetic and combinatorial means, leading to three main results. First, we show that if
$\varphi _c$
admits a rational cycle of length
$n \ge 3$
, then the denominator of c must be divisible by
$16$
. We then provide an upper bound on the number of periodic rational points of
$\varphi _c$
in terms of the number s of distinct prime factors of the denominator of c. Finally, we show that the Flynn–Poonen–Schaefer conjecture holds for
$\varphi _c$
if
$s \le 2$
, i.e., if the denominator of c has at most two distinct prime factors.
C*-algebras where every element is a limit of products of positive elements
Authors: Robert Leonel
Published: August 2021

We obtain a characterization of the unital C*-algebras with the property that every element is a limit of products of positive elements, thereby answering a question of Murphy and Phillips.
Coarse graining and large-$N$ behavior of the $d$-dimensional $N$-clock model
Authors: Cicalese Marco , Orlando Gianluca , Ruf Matthias
Published: August 2021

We study the asymptotic behavior of the

N

-clock model, a nearest neighbors ferromagnetic spin model on the

d

-dimensional cubic

\varepsilon

-lattice in which the spin field is constrained to take values in a discretization

\mathcal{S}_N

of the unit circle

\mathbb{S}^{1}

consisting of

N

equispaced points. Our

\Gamma

-convergence analysis consists of two steps: we first fix

N

and let the lattice spacing

\varepsilon \to 0

, obtaining an interface energy in the continuum defined on piecewise constant spin fields with values in

\mathcal{S}_N

; at a second stage, we let

N \to +\infty

. The final result of this two-step limit process is an anisotropic total variation of

\mathbb{S}^1

-valued vector fields of bounded variation.
A Fast Otsu Thresholding Method Based on an Improved 2D Histogram
Authors: Tan Yanli , Zhao Yongqiang
Published: August 2021

The regional division of a traditional 2D histogram is difficult to obtain satisfactory image segmentation results. Based on the gray level-gradient 2D histogram, we proposed a fast 2D Otsu method based on integral image. In this method, the average gray level is replaced by the gray level gradient in the neighborhood of pixels, and the edge features of the image are extracted according to the gray level difference between adjacent pixels to improve the segmentation effect. Calculating the integral image from the two-dimensional histogram reduces the computational complexity of searching the optimal threshold, thus reducing the amount of computation. The simulation results demonstrate that the proposed algorithm has better performance in image segmentation, with the increased computational speed and improved real-time capability.
Multi-type Parameter Prediction of Traffic Flow Based on Time-space Attention Graph Convolutional Network
Authors: Zhang Guoxing , Wang Haixiao , Yin Yuanpu
Published: August 2021

Graph Convolutional Neural Networks are more and more widely used in traffic flow parameter prediction tasks by virtue of their excellent non-Euclidean spatial feature extraction capabilities. However, most graph convolutional neural networks are only used to predict one type of traffic flow parameter. This means that the proposed graph convolutional neural network may only be effective for specific parameters of specific travel modes. In order to improve the universality of graph convolutional neural networks. By embedding time feature and spatio-temporal attention layer, we propose a spatio-temporal attention graph convolutional neural network based on the attention mechanism of the neural network. Through experiments on passenger flow data and vehicle speed data of two different travel modes (Hangzhou Metro Data and California Highway Data), it is verified that the proposed spatio-temporal attention graph convolutional neural network can be used to predict passenger flow and vehicle speed simultaneously. Meanwhile, the error distribution range of the proposed model is minimum, and the overall level of prediction results is more accurate.
Philippe Halsman’ın “Jumpology” Adını Verdiği Portre Fotoğrafları ve Yüzü Farklı Görme Biçimi
Authors: SOYGÜDER Şebnem
Published: August 2021

Philippe Halsman, dünyanın önemli ve ilginç portre fotoğrafçılarındandır. Günümüzde çoğumuzun belleğinde yer eden ikonik kabul edebileceğimiz, ünlülere ait birçok portre fotoğrafı Halsman’a aittir. 1940’lardan 50’lere kadar Amerika’daki ünlülerin (artistler, sanatçılar, siyasetçiler, devlet adamları vb.) portrelerini çektikten sonra (ki bunlar başta LIFE olmak üzere pek çok önemli dergi kapağında yer almıştır) 1950’lerin başında model olarak ele aldığı bu kişileri “zıplatarak” fotoğraflamış ve yeni bir görme biçimi ortaya çıkarmıştır. Bu çekim tekniğine de “jumpology” yani zıplama bilimi ismini vermiştir. Makalede ünlüleri zıplatma sebebi ve “yüz” hakkındaki görüşlerinden bahsedilecektir. Çalışmamızda özellikle Salvador Dali ile birlikte tasarlayıp hiçbir photoshop gibi fotoğraf düzenleme uygulaması kullanmadan çektiği ve objelerin havada asılı kaldığı anı görüntülemeye çalıştığı ilk fotoğrafı olan Dali Atomicus isimli eser anlatılacaktır. Çünkü bu eser, uzun süre kullanacağı ve dünya fotoğraf mirasının önemli bir parçası olan havada asılı kalma, zıplatma (jumpology) tekniği Halsman’ın farklı görme biçiminin başlangıcı olmuştur. Çalışma tarihsel nitel bir araştırma yöntemidir ve amaca yönelik seçilen örnek fotoğraflar Halsman’a ait olan eserlerden bazılarıdır.
Saberes em Narrativas de uma comunidade tradicional: oralidade e decolonialidade
Authors: Durães Nelcira Aparecida , Ramos Jarbas Siqueira
Published: August 2021

Resumo: Este artigo propõe refletir sobre a importância das narrativas orais como forma de resistência de comunidades tradicionais, bem como a valorização dos saberes transmitidos por essa via. Para tanto, dividimos a nossa discussão em três eixos: o primeiro trata da caracterização das comunidades tradicionais, o segundo busca apresentar um entendimento sobre oralidade e o terceiro traz à tona a experiência do contato com a comunidade rural de Morro Alto e suas oralidades. Buscamos perceber as oralidades como saberes incorporados, colados às experiências e às existências das pessoas em comunidade, e como importante elemento para fortalecimento de uma perspectiva epistemológica e metodológica decolonial.
Múltiplas Vozes e Múltiplos Sentidos do Pertencimento Étnico: estudo de remanescentes indígenas Kiriris e Payayás
Authors: Souza Leila Damiana Almeida dos Santos , Souza Kleber Peixoto de
Published: August 2021

Apresentamos nesse artigo aspectos epistemológicos que contribuem para análise da constituição da identidade étnica de um dos grupos humanos que compõe a diversidade dos remanescentes dos povos indígenas Kiriris e Payayás, no distrito de Missão do Sahy, em Senhor do Bonfim, Bahia.  Metodologicamente nos valemos da história oral para nos aproximarmos dos processos constitutivos dos remanescentes indígenas e, consequentemente, contribuirmos para o fortalecimento cultural dos ascendentes dos Kiriris e Payayás que ali residem. Os resultados nos apontam que, por meio de uma ação dialógica, foi possível contribuir com o processo de construção da identidade étnica dos sujeitos envolvidos.
Novel Key Recovery Attack on Secure ECDSA Implementation by Exploiting Collisions between Unknown Entries
Authors: Jin Sunghyun , Lee Sangyub , Cho Sung Min , Kim HeeSeok , Hong Seokhie
Published: August 2021

In this paper, we propose a novel key recovery attack against secure ECDSA signature generation employing regular table-based scalar multiplication. Our attack exploits novel leakage, denoted by collision information, which can be constructed by iteratively determining whether two entries loaded from the table are the same or not through side-channel collision analysis. Without knowing the actual value of the table entries, an adversary can recover the private key of ECDSA by finding the condition for which several nonces are linearly dependent by exploiting only the collision information. We show that this condition can be satisfied practically with a reasonable number of digital signatures and corresponding traces. Furthermore, we also show that all entries in the pre-computation table can be recovered using the recovered private key and a sufficient number of digital signatures based on the collision information. As case studies, we find that fixed-base comb and T_SM scalar multiplication are vulnerable to our attack. Finally, we verify that our attack is a real threat by conducting an experiment with power consumption traces acquired during T_SM scalar multiplication operations on an ARM Cortex-M based microcontroller. We also provide the details for validation process.
Optimal Sizing of a Pv-Wind Hybrid System Using Measured and Generated Database
Authors:   LabSET), Department of Renewable Energies, Faculty of Technology, USDB, Blida, Algeria, Benallal Abdellah , Cheggaga Nawel ,   LabSET), Department of Renewable Energies, Faculty of Technology, USDB, Blida, Algeria
Published: August 2021

Renewable energy hybrid systems give a good solution in isolated sites, in the Algerian desert; wind and solar potentials are considerably perfect for a combination in a renewable energy hybrid system to satisfy local village electrical load and minimize the storage requirements, which leads to reduce the cost of the installation. For a good sizing, it is essential to know accurately the solar potential of the installation area also wind potential at the same height where wind electric generators will be placed. In this work, we optimize a completely autonomous PV-wind hybrid system and show the techno-economical effects of the height of the wind turbine on the sizing of the hybrid system. We also compare the simulation results obtained from using wind speed measured data at 10 meters and 40 meters of height with the ones obtained from using wind speed extrapolation on HOMER software.
Survey of Six Maximum Power Point Tracking Algorithms under Standard Test conditions
Authors:   Department of Electrical Engineering, Laboratoire d’électrotechnique de Skikda «LES», Université du 20 Août 1955, Skikda 21000, Algeria, Bouakkaz Mohammed Salah , Boukadoum Ahcene ,   Department of Electrical Engineering, Laboratoire d’électrotechnique de Skikda «LES», Université du 20 Août 1955, Skikda 21000, Algeria, Boudebbouz Omar ,   Department of Electrical Engineering, Laboratoire d’électrotechnique de Skikda «LES», Université du 20 Août 1955, Skikda 21000, Algeria, Attoui Issam ,   Department of Electrical Engineering, Laboratoire d’électrotechnique de Skikda «LES», Université du 20 Août 1955, Skikda 21000, Algeria, Boutasseta Nadir ,   Department of Electrical Engineering, Laboratoire d’électrotechnique de Skikda «LES», Université du 20 Août 1955, Skikda 21000, Algeria, Bouraiou Ahmed ,   Unité de Recherche en Energies Renouvelables en Milieu Saharien,URERMS, Centre de Développement des Energies Renouvelables ,CDER, 01000 Adrar, Algeria.
Published: August 2021

In this work, a survey is carried out on six MPPT algorithms which include conventional and artificial intelligence based approaches. Maximum Power Point Tracking (MPPT) algorithms are used in PV systems to extract the maximum power in varying climatic conditions. The following most popular MPPT techniques are being reviewed and studied: Hill Climbing (HC), Perturb and Observe (P&O), Incremental Conductance (INC), Open-Circuit Voltage (OCV), Short Circuit Current (SCC), and Fuzzy Logic Control (FLC). The algorithms are evaluated, analyzed, and interpreted using a Matlab-Simulink environment to show the performance and limitations of each algorithm
Complicações protéticas na implantodontia: uma revisão de literatura
Authors: Siqueira Alexandre Gomes de , Ribeiro Eduardo Dias , Lima Saulo Anderson Neves de , Formiga Filho Amaro Lafayette Nobre , Aguiar Anne Helena Duarte de , Leite Josélia da Silva
Published: August 2021

A odontologia moderna está cada vez mais tecnológica e envolvida na interdisciplinaridade, a implantodontia não é diferente e anda a passos largos no avanço de suas técnicas e procedimentos, ao lado da prótese dentária vem alcançando novos patamares e possibilitando o tratamento reabilitador oral de cada vez mais pacientes, atualmente a maior parte dos casos de edentulismo podem ser tratadas por meio da instalação de implantes dentários, infelizmente alguns casos ainda encontram insucesso, e isso pode ser relacionado a diferentes processos, como problemas biomecânicos e biológicos dentre os quais podemos citar as fraturas, afrouxamentos e processos inflamatórios. Sabendo da importância do constante aprimoramento nas técnicas cirúrgicas e de instalação de peças protéticas o presente artigo tem por objetivo apresentar uma revisão de literatura sobre as complicações protéticas na implantodontia, de modo a prevenir a ocorrência desses problemas.