bluuebunny/crossref_metadata_2025 huggingface dataset:
Characterization of Bacillus nealsonii strain KBH10 capable of reducing aqueous mercury in laboratory-scale reactor
Authors: Farooqi Asifa , Din Ghufranud , Hayat Rameesha , Badshah Malik , Khan Samiullah , Shah Aamer Ali
Published: March 2021

The environmental release of mercury is continuously increasing with high degree of mobility, transformation and amplified toxicity. Improving remediation strategies is becoming increasingly important to achieve more stringent environmental safety standards. This study develops a laboratory-scale reactor for bioremediation of aqueous mercury using a biofilm-producing bacterial strain, KBH10, isolated from mercury-polluted soil. The strain was found resistant to 80 mg/L of HgCl2 and identified as Bacillus nealsonii via 16S rRNA gene sequence analysis. The strain KBH10 was characterized for optimum growth parameters and its mercury biotransformation potential was validated through mercuric reductase assay. A packed-bed column bioreactor was designed for biofilm-mediated mercury removal from artificially contaminated water and residual mercury was estimated. Strain KBH10 could grow at a range of temperature (20–50 °C) and pH (6.0–9.0) with optimum temperature established at 30 °C and pH 7.0. The optimum mercuric reductase activity (77.8 ± 1.7 U/mg) was reported at 30 °C and was stable at a temperature range of 20–50 °C. The residual mercury analysis of artificially contaminated water indicated 60.6 ± 1.5% reduction in mercury content within 5 h of exposure. This regenerative process of biofilm-mediated mercury removal in a packed-bed column bioreactor can provide new insight into its potential use in mercury bioremediation.
ANÁLISE DE DADOS QUALITATIVOS COM O R
Authors: Passos Iara Cunha
Published: March 2021

O artigo se propõe a apresentar o RQDA, pacote da linguagem R para análise qualitativa, como uma alternativa a softwares proprietários para esse tipo de pesquisa que hoje são bastante populares, tais como NVivo e Atlas.ti. Em um primeiro momento, discute-se a trajetória dos softwares de apoio à análise qualitativa de dados, conhecidos pela sigla em inglês CAQDAS (Computer-assisted Qualitative Data Analysis Software). Em seguida, o artigo apresenta a linguagem R e o pacote RQDA, com instruções para a suas instalações. Por fim, a partir de exemplos, são mostradas funcionalidades, como a importação de arquivos e codificações, além de outras algumas aplicações de análise qualitativa de dados.
Self-regulation of students’ public activity during the digitalization of the social space
Authors: Narkhov Dmitry Yu. , Narkhova Elena N. , Mishin Lev V. , Melnikova Elena P.
Published: March 2021

This article studies the problem of social activity of the students of the Sverdlovsk Region in the context of intensified digitalization of the social space caused by the forced self-isolation. The purpose of this paper is to analyze the self-regulation of students’ social activity in the conditions of digitalization of the social space. Following the traditions of the Ural scientific sociological school and the concepts of multidimensionality and self-organization of youth, as well as using community, activity, and other sociological approaches, the authors use a terminological series of concepts of the student educational community and its social activity. They distinguish the terms “classical (traditional) community”, acting in a real socio-cultural space, “virtual community”, the social action of which is transferred to cyberspace, and “digital community”, occupying an intermediate position and acting in a multidimensional real-virtual sociocultural space. The social activity of students is considered as one of the types (along with educational and professional) social activity and a form of actual general cultural socialization. Employing the materials of empirical research in 2020 and with the involvement of data from the secondary analysis of regional monitoring, the authors study the factors, intensity, and dynamics of social activity of students. The results reveal the ideas of students about people serving as role models and multidirectional tendencies in value attitudes — to help society and specific people and to material success and comfort. New data were obtained on the social problems of concern to students, the preferred type of public activity, attitude towards the citizenship of the Russian Federation, the dynamics of participation in electoral processes, collective actions, participation in the work of public organizations and charitable events. The attitude of students to youth public organizations and conditions for active participation of young people in social and political activities is revealed. The authors conclude on the reorientation of a significant part of the student body towards the priority of the personal over the public and about the further stratification and atomization of the student community.
Blended Acceptance and Commitment Therapy Versus Face-to-face Cognitive Behavioral Therapy for Older Adults With Anxiety Symptoms in Primary Care: Pragmatic Single-blind Cluster Randomized Trial
Authors: Witlox Maartje , Garnefski Nadia , Kraaij Vivian , de Waal Margot W M , Smit Filip , Bohlmeijer Ernst , Spinhoven Philip
Published: March 2021

Background

Anxiety symptoms in older adults are prevalent and disabling but often go untreated. Most trials on psychological interventions for anxiety in later life have examined the effectiveness of face-to-face cognitive behavioral therapy (CBT). To bridge the current treatment gap, other treatment approaches and delivery formats should also be evaluated.

Objective

This study is the first to examine the effectiveness of a brief blended acceptance and commitment therapy (ACT) intervention for older adults with anxiety symptoms, compared with a face-to-face CBT intervention.

Methods

Adults aged between 55-75 years (n=314) with mild to moderately severe anxiety symptoms were recruited from general practices and cluster randomized to either blended ACT or face-to-face CBT. Assessments were performed at baseline (T0), posttreatment (T1), and at 6- and 12-month follow-ups (T2 and T3, respectively). The primary outcome was anxiety symptom severity (Generalized Anxiety Disorder-7). Secondary outcomes were positive mental health, depression symptom severity, functional impairment, presence of Diagnostic and Statistical Manual of Mental Disorders V anxiety disorders, and treatment satisfaction.

Results

Conditions did not differ significantly regarding changes in anxiety symptom severity during the study period (T0-T1: B=.18, P=.73; T1-T2: B=−.63, P=.26; T1-T3: B=−.33, P=.59). Large reductions in anxiety symptom severity (Cohen d≥0.96) were found in both conditions post treatment, and these were maintained at the 12-month follow-up. The rates of clinically significant changes in anxiety symptoms were also not different for the blended ACT group and CBT group (χ21=0.2, P=.68). Regarding secondary outcomes, long-term effects on positive mental health were significantly stronger in the blended ACT group (B=.27, P=.03, Cohen d=0.29), and treatment satisfaction was significantly higher for blended ACT than CBT (B=3.19, P<.001, Cohen d=0.78). No other differences between the conditions were observed in the secondary outcomes.

Conclusions

The results show that blended ACT is a valuable treatment alternative to CBT for anxiety in later life.

Trial Registration

Netherlands Trial Register TRIAL NL6131 (NTR6270); https://www.trialregister.nl/trial/6131
Phylogenetic and Mutational Analysis of Lassa Virus Strains Isolated in Nigeria: Proposal for an In Silico Study (Preprint)
Authors: Kolawole Daniel , Raji Hayatu , Okeke Malachy Ifeanyi
Published: March 2021

BACKGROUND

In 2018, the total number of Lassa fever cases in Nigeria was significantly higher than that observed in previous years. Hence, studies had attempted to determine the underlying cause. However, reports using phylogenetic methods to analyze this finding ruled out the emergence of potentially more transmissible Lassa virus strains or an increase in human-to-human viral transmission as the cause underlying the increase in cases. Two years later, the situation seems even worse as the number of confirmed cases has reached an all-time high according to situational reports released by the Nigerian Center for Disease Control.

OBJECTIVE

Considering the increasing trend of Lassa fever cases and related mortality, the major objective of this study is to map mutations within the genomes of Lassa virus isolates from 2018 and 2019 using the reference sequence available at the National Center for Biotechnology Information as a benchmark and compare them to the genomes of viruses isolated during 1969-2017. This study would also attempt to identify a viral marker gene for easier identification and grouping. Finally, the time-scaled evolution of Lassa virus in Nigeria will be reconstructed.

METHODS

After collecting the sequence data of Lassa virus isolates, Bayesian phylogenetic trees, a sequence identity matrix, and a single nucleotide polymorphism matrix will be generated using BEAST (version 2.6.2), Base-By-Base, and DIVEIN (a web-based tool for variant calling), respectively.

RESULTS

Mining and alignment of Lassa virus genome sequences have been completed, while mutational analysis and the reconstruction of time-scaled maximum clade credibility trees, congruence tests for inferred segments, and gene phylogeny analysis are ongoing.

CONCLUSIONS

The findings of this study would further the current knowledge of the evolutionary history of the Lassa virus in Nigeria and would document the mutations in Nigerian isolates from 1969 to 2019.

INTERNATIONAL REGISTERED REPORT

DERR1-10.2196/23015
Clinical Characteristics of Children With COVID-19 in the United Arab Emirates: Cross-sectional Multicenter Study (Preprint)
Authors: Ennab Farah , ElSaban Mariam , Khalaf Eman , Tabatabaei Hanieh , Khamis Amar Hassan , Devi Bindu Radha , Hanif Kashif , Elhassan Hiba , Saravanan Ketharanathan , Cremonesini David , Popatia Rizwana , Malik Zainab , Ho Samuel B , Abusamra Rania
Published: March 2021

BACKGROUND

COVID-19 has infected over 123 million people globally. The first confirmed case in the United Arab Emirates (UAE) was reported on January 29, 2020. According to studies conducted in the early epicenters of the pandemic, COVID-19 has fared mildly in the pediatric population. To date, there is a lack of published data about COVID-19 infection among children in the Arabian region.

OBJECTIVE

This study aims to investigate the clinical characteristics, laboratory findings, treatment, and outcomes of children with COVID-19.

METHODS

This cross-sectional, multicenter study included children with confirmed COVID-19 infection admitted to 3 large hospitals in Dubai, UAE, between March 1 and June 15, 2020. Serial COVID-19 polymerase chain reaction (PCR) testing data were collected, and patients’ demographics, premorbid clinical characteristics, and inpatient hospital courses were examined.

RESULTS

In all, 111 children were included in our study and represented 22 nationalities. Of these, 59 (53.2%) were boys. The mean age of the participants was 7 (SD 5.3) years. About 15.3% of children were younger than 1 year. Only 4 (3.6%) of them had pre-existing asthma, all of whom had uneventful courses. At presentation, of the 111 children, 43 (38.7%) were asymptomatic, 68 (61.2%) had mild or moderate symptoms, and none (0%) had severe illness requiring intensive care. Fever (23/111, 20.7%), cough (22/111, 19.8%), and rhinorrhea (17/111, 15.3%) were the most common presenting symptoms, and most reported symptoms resolved by day 5 of hospitalization. Most patients had no abnormality on chest x-ray. The most common laboratory abnormalities on admission included variations in neutrophil count (22/111, 24.7%), aspartate transaminase (18/111, 22.5%), alkaline phosphatase (29/111, 36.7%), and lactate dehydrogenase (31/111, 42.5%). Children were infrequently prescribed targeted medications, with only 4 (3.6%) receiving antibiotics. None of the 52 patients tested for viral coinfections were positive. COVID-19 PCR testing turned negative at a median of 10 days (IQR: 6-14) after the first positive test. Overall, there was no significant difference of time to negative PCR results between symptomatic and asymptomatic children.

CONCLUSIONS

This study of COVID-19 presentations and characteristics presents a first look into the burden of COVID-19 infection in the pediatric population in the UAE. We conclude that a large percentage of children experienced no symptoms and that severe COVID-19 disease is uncommon in the UAE. Various laboratory abnormalities were observed despite clinical stability. Ongoing surveillance, contact tracing, and public health measures will be important to contain future outbreaks.

CLINICALTRIAL
“Ndableg,” “Ra Sah Ngeyel”: Verbal Offense through Banners about the COVID-19 Pandemic
Authors: Munandar Aris
Published: March 2021

Frustration can be expressed in public in different ways. During the Covid-19 pandemic, the grassroots protestors in Yogyakarta vent their frustrations triggered by the uncertainty through banners, which are simple, yet send messages of the country’s wrongdoings in dealing with the pandemic. This paper discusses verbal violence through negative sentiments expressed in the banners the Yogyakarta grassroots organizations use to respond to the Covid-19 pandemic prevention campaign. This study collected the data from 20 banners displayed in rural areas in Sleman regency, Yogyakarta, during March through April 2020. The analysis applied a sociopragmatic approach. The findings reveal the banners’ strong negative tones targetted to the lower-working class which reflect an inaccurate understanding of the fundamental concept of Covid-19 preventive measures and mitigation. Stigmatization of the lower-working class is underway to hurt the cohesion of society. The negative tones can escalate people’s anxiety, counterproductive to Covid-19 pandemic mitigation as it is against the wisdom of coping with the pandemic with a peaceful mind. Therefore, it suggests that evaluation by the agents of authority is imperative to prevent misunderstanding of the Covid-19 pandemic and build effective communication skills.
Blunders of Government Communication: The Political Economy of COVID-19 Communication Policy in Indonesia
Authors: Masduki Masduki
Published: March 2021

Government officials and politicians have been both a help and hindrance in the public dissemination of information during the COVID-19 pandemic. The intervention of a president and his/her ministries with their political and economic interests is particularly problematic when they employ a tactical approach rather than provide accurate and effective disaster information. This paper utilizes a political-economy approach to analyze the link between COVID-19 communication policies and practices with the interests of politics and market stability in Indonesia. In this paper, the author drills into the extent to which the country’s president and ministries manage their political interests in times of global pandemic. The ways they interact with the public during various stages of disaster are crucial because society is severely disrupted, with the government serving as the sole actor. This study uses qualitative methods and all materials are managed from an extensive review of current literature, policy analysis, and field observation. This paper finds that Indonesian government communication during the COVID-19 pandemic period (February– June 2020) has been dominated by a desire to maintain a strong power of the ruling authority and to secure market stability. Two factors—pro-market communication policies and manufactured- politicized COVID-19 data—have occurred. This paper contributes to the literature by focusing on the political and economic approach over the mediated discourses surrounding the pandemic.
PROMOTING MEASURES FOR PREVENTING CONFLICTS BETWEEN FARMERS AND CATTLE HERDSMEN IN RURAL COMMUNITIES OF BENUE STATE, NIGERIA
Authors: EN MBAH , NE AMAH , BS MITU
Published: March 2021

Objective: The study was carried out to identify measures for preventing conflicts between farmers and cattle herdsmen in rural communities of Benue State, Nigeria. The specific objectives were to: Describe the socioeconomic characteristics of the respondents; ascertain the causes of conflict between farmers and cattle herdsmen in the study area; and identify measures required for preventing conflicts between farmers and cattle herdsmen.

Methods: Data were collected from a sample of one hundred and eighteen (118) respondents in four communities in the study area using a well-structured questionnaire. Descriptive statistics such as frequency, percentage, mean, and standard deviation were used for data analysis.

Results: Majority (90.7%) of the respondents had farming as a major source of livelihood, 55.1% were male while 62.7% were married. Damage to crops by cattle (x̄=2.72), uncontrolled grazing (x̄=2.52), herders claiming the land as common property (x̄=2.40), and destruction of farmland (x̄=2.30) were the major causes of conflicts. Measures required for preventing conflicts between farmers and cattle herdsmen include herdsmen education on the effects of the conflict (x̄=2.21), signing of a peace accord by both parties (x̄=2.12), establishment of ranches (x̄=2.06), implementation of law prohibiting open grazing (x̄=2.05), and disarming both parties (x̄=1.87).

Conclusion: Educating farmers and herdsmen on the effects of the conflict, signing of a peace accord agreement by both parties, establishment of ranches, implementation of law prohibiting open grazing, and disarming both parties were measures required for preventing conflicts between farmers and cattle herdsmen. It is recommended that law enforcement agencies should enforce law on open grazing to avoid conflicts between farmers and cattle herdsmen in the area.
REVIEW OF CHARACTERISTIC FEATURES OF ABHRAKA WSR TO PINAKA ABHRAKA
Authors: GUPTA JAY PRAKASH , GOYAL MANISHA , AGARWAL RAJARAM
Published: March 2021

Rasashastra (Vedic chemistry) is the root branch of the Ayurveda (the science of life) that deals with herbomineral preparations. Abhraka (mica) is a mineral that classified in Maharasa group of Rasashastra. It contains several elements such as Si, Fe, Al, Mg, Na, and K as main ingredients. Four types of abhrakas are described in the Classics of Rasashastra including pinaka. Property of Pinaka is told that when it is heated on fire, the layers get separates. Intake of its bhasma causes severe constipation. The characteristic effect of pinak abhraka can be correlated with muscovite – paragonite micas. Because their perfect basal cleavage allows them to be split into thin, flexible sheets. Muscovite–paragonite series group of mica having hydrous potassium, sodium, aluminum, and silicate minerals. In this hydrous group, aluminum hydroxide causes constipation. In this paper, an attempt will be made to explain how does pinaka abhrak causes severe constipation.
ACCESS TO HANDHYGIENE IN SOUTH EAST ASIA IN RELATION TO COVID-19: A REVIEW
Authors: AHMED IMTEYAZ , WANI A AJAZ
Published: March 2021

The present review aims at gathering refocus on access to handwashing in South East Asia. It is because, here nearly half of the households, schools and about one fourth of the health care centers lack the basic handwashing facility and that too at the time when about one third of global new COVID-19 positive cases are getting reported from this region these days. Data on access to, handwashing device having soap and water availability, in South Asia is mainly based on the World Health Organization (WHO) and United Nations Children’s Fund (UNICEF JMP) Joint Monitoring Programme for Water Supply, Sanitation, and Hygiene (WHO/UNICEF JMP 2020). In addition various relevant research and review papers were reviewed using the key words such as handwashing, South East Asia, Hand hygiene, and COVID-19. There is a high need to reaccess the factor of hand hygiene in South East Asia in relation to COVID-19 for the control of the present pandemic and other such challenges, particularly in South East Asia.
MICROSCOPE IN DENTISTRY: A REVIEW ARTICLE
Authors: MUKHERJEE SUMAN , DASGUPTA SHARMISTHA
Published: March 2021

The microscope has been one of the oldest yet most exquisite inventions in human history. The lenses changed the future of medical science and its abstraction forever. Previously, humans never know much about the source of disease, but today we know that the universe of microbes is vaster and more limitless than it ever was. However, the microscope is not just limited to laboratory in vitro research and study; it has remodeled dentistry more today than ever. This article describes the various types of microscopes used in periodontics, endodontics, and oral pathology in dentistry.
CIRCUMSTANCES AND PROBLEMS OF STREET CHILDREN IN GONDAR CITY ADMINISTRATION: IN A QUALITATIVE STUDY
Authors: ABERA BISET YALEW , TAA BUSHA
Published: March 2021

Objective: This research aimed to investigate the circumstances and problems of street children in Gondar city administration.  

Methods: To achieve the research objectives, qualitative method and Phenomenological design were employed to investigate the daily lived experience of street children. The data were collected by using in-depth interview, FGD and key informants   and analyzed thematically.  Purposive and snowballing sampling techniques in this study were employed to select participants.  

Results: The findings of the study showed that children joined the street due to lack of family planning, divorce, parental detachment, poverty, abuse, and neglect, socio- cultural issues  and peer pressure.   They are encountered rape, inadequate basic needs social exclusion, and health problems and inaccessibility of health services.

Conclusion:  Street children additionally face more troubles once they are on the street that is surely going to have an effect on their development.
THE SUBSTANCE AND IMPLICATIONS OF INTEGRAL PLANNING IN LOCAL GOVERNMENT UNITS
Authors: Vukonjanski Igor
Published: March 2021

Local development planning in local government units (municipalities and towns) has always played an important social role in all countries. In recent decades, this area has been regulated by adequate laws, which differ greatly from one another primarily due to an underdeveloped science-based theory of local development. According to the recently constructed theory, two local planning systems were identified. The first system (of a long-standing tradition) is called the partial system because local and overall social development in a particular country is solely taken care of by a country that has its own development interests. The second (new) system is called the integral system, which implies partner relations between the state and the most influential professional democratic forces that participate in development planning activities. The comparison of these two systems points to the great advantages of the integral system of local planning over the partial one; for this reason, developed countries are increasingly switching to the use of the integral system. Due to the insufficiently developed theory of local planning, this scientific article aims to contribute to supplementing the integral system of local development by projecting its general implications for local self-government and the associated nation-state, as well as the international community. Based on relevant research methods, the obtained results have shown that the implementation of this system implicitly causes positive fundamental social changes which enable less developed countries in particular to catch up with the developed countries much faster and much more efficiently.
THE HISTORICAL DEVELOPMENT OF THE INSTITUTE OF CO-PERPETRATION IN CRIMINAL LAW
Authors: Golubović Bojana , Mirić Filip
Published: March 2021

Co-perpetration is one of the most complex forms of committing a crime. The paper presents the development of this institute, beginning with the legal sources of the ancient world, but also the slave and feudal criminal legislation. The authors also analyze the emergent forms of this institute in French bourgeois and German parity law. Finally, the authors deal with this institute in the criminal legislation of feudal and bourgeois Serbia, the Kingdom of Yugoslavia, but also in the modern criminal legislation of the Republic of Serbia. The aim of the paper is to point out possible directions for reform of this very important institute of criminal law.
FORENSIC EVIDENCE: SCIENCE AND THE CRIMINAL LAW
Authors: Mirić Filip
Published: March 2021

The Book Forensic Evidence: Science and the Criminal Law is intended to serve as an introductionand guide to the appreciation and understanding of the significant historical, contemporary, and future relationship between the world of the forensic sciences and the criminal justice system. This book is not intended to be a close study of forensic science, nor was it ever conceived as becoming one. It is devoted to a study of the judicial response to uses of forensic science in all phases of criminal procedure. The audience to which this study is directed are those intimately or potentially involved in that relationship: police, forensic scientists, prosecutors, defense lawyers, and professors and students- future lawyers.
BEHAVIOURAL ECONOMICS AND PUBLIC POLICIES: SOME INTRODUCTORY ISSUES
Authors: Mojašević Aleksandar
Published: March 2021

The paper aims to inform the domestic public about the basic concepts of behavioural economics, its historical development and intellectual basis, the application of its findings in policymaking, and its effectiveness in current practical application. In the first part of the paper, the author presents the basic concepts of behavioural economics: the nudge, the choice architecture, the libertarian paternalism, cognitive biases, and others. The second part of the paper provides a concise overview of the critiques directed at behavioural economics and libertarian paternalism (Posner's critique, Mitchell's critique), and a review of the empirical validity of certain behavioural economics phenomena. The third part presents the use of behavioural findings to inform the design of public policy in different domains (the behavioural public policy), along with numerous examples, mostly from the practice of the Behavioural Insights Team in the United Kingdom.
BUOYANCY AND CHEMICAL REACTION EFFECTS ON MHD FREE CONVECTIVE SLIP FLOW OF NEWTONIAN AND POLAR FLUID THROUGH POROUSMEDIUM IN THE PRESENCE OF THERMAL RADIATION AND OHMIC HEATING WITH DUFOUR EFFECT
Authors: Choudhary Komal , Jha Abhay Kumar , Mishra Lakshmi Narayan , Vandana Ms.
Published: March 2021

The present paper investigates the effects of thermal radiation, joule heating on an unsteady hydro magnetic free convective flow of a viscous electrically conductive Newtonian and polar fluid past a semi-infinite vertical plate embedded in a porous media in the presence of heat absorption, chemical reaction, slip flow and Dufour effect. Analytical perturbation solutions are obtained for the velocity, temperature and concentration fields as well as for the skin friction coefficient, Nusselt number and Sharewood number. The results are presented in graphical forms to study the effects of various parameters.
Totally real submanifolds of (LCS)n-manifolds
Authors: Hui Shyamal Kumar , Pal Tanumoy
Published: March 2021

The present paper deals with the study of totally real submanifolds and C-totally real submanifolds of (LCS)n-manifolds withrespect to Levi-Civita connection as well as quarter symmetric metric connection. It is proved that scalar curvature of C-totally real submanifolds of (LCS)n-manifold with respect to both the said connections are same.
On Numerical Evaluation of Packet-Error Rate for Binary Phase-Modulated Signals Reception over Generalized-K Fading Channels
Authors: Marjanović Zvezdan , Milić Dejan N. , Đorđević Goran T.
Published: March 2021

We present a numerical evaluation of packet error rate (PER) for digital binary phase modulations over wireless communication channels. The analysis is valid for a quasistatic fading communication channel, where multipath fading and shadowing appear simultaneously. The approach is based on numerical evaluation of signal-to-noise ratio threshold that is further used in PER computation. We analyze the threshold and PER dependence on signal power, multipath fading and shadowing severity, as well as packet length.
On the quasi-conformal curvature tensor of an almost Kenmotsu manifold with nullity distributions
Authors: Dey Dibakar , Majhi Pradip
Published: March 2021

The object of the present paper is to characterize quasi-conformally flat and $\xi$-quasi-conformally flat almost Kenmotsu manifolds with  $(k,\mu)$-nullity and $(k,\mu)'$-nullity distributions respectively. Also we characterize almost Kenmotsu manifolds with vanishing extended quasi-conformal curvature tensor and extended $\xi$-quasi-conformally flat almost Kenmotsu manifolds such that the characteristic vector field $\xi$ belongs to the $(k,\mu)$-nullity distribution.
A BRANCH-AND-BOUND ALGORITHM FOR A PSEUDO-BOOLEAN OPTIMIZATION PROBLEM WITH BLACK-BOX FUNCTIONS
Authors: Masich Igor S. , Kazakovtsev Lev A.
Published: March 2021

We consider a conditional pseudo-Boolean optimization problem with both the objective function and all constraint functions given algorithmically (black-box functions) and defined on {0, 1}n only. We suppose that these functions have certain properties, for example, unimodality and monotonicity. To solve problems of this type, we propose an optimization algorithm based on finding boundary points of the feasible region and the branch-and-bound method. The developed algorithm is aimed at the reception of an exact solution of an optimization problem. In addition, this algorithm can be used as an improvement of approximate algorithms such as the greedy heuristic and the random search algorithms for finding boundary points. Even after a small number of iterations (branchings), a significant improvement of the found feasible solution is achieved.
PROJECTIVE CHANGE BETWEEN RANDERS METRIC AND EXPONENTIAL (A, B)-METRIC
Authors: Yadav Ganga Prasad , Pandey Paras Nath
Published: March 2021

In this paper, we find the conditions to characterize projective change between two  (A, B)-metrics, such as exponential (A, B)-metric,  and Randers metric L=A+B on a manifold with dim n > 2, where A and A are two Riemannian metrics, B and B are two non-zero 1-forms. Further, we discussed the special curvature properties of two classes of (A, B)-metrics.
ON TZITZEICA CURVES IN EUCLIDEAN 3-SPACE E^3
Authors: Bayram Bengü , Tunç Emrah , Arslan Kadri , Öztürk Günay
Published: March 2021

In this study, we consider Tzitzeica curves (Tz-curves) in Euclidean 3-space E^3. We characterize such curves according to their curvatures. We show that there is no Tz-curve with constant curvatures (W-curves). We consider Salkowski (TC-curve) and Anti-Salkowski curves.
NONLINEAR INVARIANTS OF PLANAR POINT CLOUDS TRANSFORMED BY MATRICES
Authors: Kotsios Stylianos , Melas Evangelos
Published: March 2021

The goal of this paper is to present invariants of planar point clouds, thatis functions which take the same value before and after a linear transformation of aplanar point cloud via a 2 × 2 invertible matrix. In the approach we adopt here, theseinvariants are functions of two variables derived from the least squares straight line ofthe planar point cloud under consideration. A linear transformation of a point cloudinduces a nonlinear transformation of these variables. The said invariants are solutionsto certain Partial Differential Equations, which are obtained by employing Lie theory.We find cloud invariants in the general case of a four−parameter transformation matrix, as well as, cloud invariants of various one−parameter sets of transformations which can be practically implemented. Case studies and simulations which verify our findings are also provided.
Determining Solutions of Fuzzy Cellular Neural Networks with Fluctuating Delays
Authors: Stanimirovic Ivan P.
Published: March 2021

This pap er deals with the problem of nonp erio dic arrange ments for fuzzy cell neuralsystems with fluctuating delays. By utiliz ing c ompre ssion mapping and Krasnoselski’ssettled p oint hyp othesis and developing some appropriate Lyapunov functionals, ade quateconditions are s et up for the presence and worldwide exp onential solidness of solutions ofFCNNs with fluctuating delays. In addition, illustrative examples are set up to exhibit amo del.
COMPUTING TRIANGULATIONS OF THE CONVEX POLYGON IN PHP/MYSQL ENVIRONMENT
Authors: Mašović Sead H. , Saračević Muzafer H. , Stanimirović Predrag S. , Krtolica Predrag V.
Published: March 2021

In this paper we implement Block method for convex polygon triangulation in web environment (PHP/MySQL). Our main aim is to show the advantages of usage of web technologies in performing complex algorithm from computer graphics. The basic assumption is that one obtained results we store in database and use it for other calculation. Databases are convenient and structured methods of sharing and retrieving data. We have performed a comparative analysis of developed program with respect to two criteria: CPU time in generating triangulation and CPU time in reading results from database.
FIXED POINT OF MULTIVALUED CONTRACTIONS IN ORTHOGONAL MODULAR METRIC SPACES
Authors: Hosseini Hoda , Gordji Majid Eshaghi
Published: March 2021

In this paper we generalize the notion of O−set and establish some fixedpoint theorems for ⊥ − α − ψ−contraction multifunction in the setting of orthogonalmodular metric spaces. As consequences of these results we deduce some theorems inorthogonal modular metric spaces endowed with a graph and partial order. Finally,we establish some theorems for integral type contraction multifunctions and give someexamples to demonstrate the validity of the results.
ON PARAMETRIZED HERMITE-HADAMARD TYPE INEQUALITIES
Authors: Khan Muhammad Adil , Khurshid Yousaf
Published: March 2021

In recent years, many results have been devoted to the well-known Hermite-Hadamard inequality. This inequality has many applications in the area of pure and applied mathematics. In this paper, our main aim is to give a parametrized inequality of the Hermite-Hadamard type and its applications to f-divergence measures and means.First, we prove the identity associated with the right side of the Hermite-Hadamard inequality. By using this identity, the convexity of the function and some well-known inequalities, we obtain several results for the inequality. The inequalities derived here also point out some known results as their special cases.
RADICAL TRANSVERSAL SCR-LIGHTLIKE SUBMANIFOLDS OF INDEFINITE KAEHLER MANIFOLDS
Authors: Yadav Akhilesh
Published: March 2021

In this paper, we introduce the notion of radical transversal screen Cauchy-Riemann (SCR)-lightlike submanifolds of indefinite Kaehler manifolds giving a charac-terization theorem with some non-trivial examples of such submanifolds. Integrabilityconditions of distributions D1, D2, D and D? on radical transversal SCR-lightlike sub-manifolds of an indefinite Kaehler manifold have been obtained. Further, we obtainnecessary and sufficient conditions for foliations determined by the above distributionsto be totally geodesic.
HILBERT MATRIX AND DIFFERENCE OPERATOR OF ORDER m
Authors: Kirisci Murat , Polat Harun
Published: March 2021

In this paper, some applications of the Hilbert matrix in image processing and cryptology are mentioned and an algorithm related to the Hilbert view of a digital image is given. New matrix domains are constructed and some of their properties are investigated. Furthermore, dual spaces of new matrix domains are computed and matrix transformations are characterized. Finally, examples of transformations of new spaces are given.
NONLINEAR SINGULAR STURM-LIOUVILLE PROBLEMS WITH IMPULSIVE CONDITIONS
Authors: Allahverdiev Bilender P. , Tuna Husein
Published: March 2021

In this paper, we consider a non-linear impulsive Sturm-Liouville problem on semiinfinite intervals in which the limit-circle case holds at infinity for THE Sturm-Liouville expression. We prove the existence and uniqueness theorems for this problem.
RICCI SOLITONS AND GRADIENT RICCI SOLITONS ON NEARLY KENMOTSU MANIFOLDS
Authors: Ayar Gülhan , Yıldırım Mustafa
Published: March 2021

In this paper, we study nearly Kenmotsu manifolds with Ricci soliton and we obtain certain conditions about curvature tensors.
CONDITIONAL LEAST SQUARES ESTIMATION OF THE PARAMETERS OF HIGHER ORDER RANDOM ENVIRONMENT INAR MODElS
Authors: Laketa Petra N. , Nastic Aleksandar S.
Published: March 2021

Two different random environment INAR models of higher order, precisely RrNGINARmax(p) and RrNGINAR1(p), are presented as a new approach to modeling non-stationary nonnegative integer-valued autoregressive processes. The interpretation of these models is given in order to better understand the circumstances of their application to random environment counting processes. The estimation statistics, defined using the Conditional Least Squares (CLS) method, is introduced and the properties are tested on the replicated simulated data obtained by RrNGINAR models with different parameter values. The obtained CLS estimates are presented and discussed.
ON CAPABLE GROUPS OF ORDER p4
Authors: Salahshour Mohammad Ali , Ashrafi Ali Reza
Published: March 2021

A group $H$ is said to be capable, if there exists another group$G$ such that $\frac{G}{Z(G)}~\cong~H$, where $Z(G)$ denotes thecenter of $G$. In a recent paper \cite{2}, the authorsconsidered the problem of capability of five   non-abelian $p-$groups of order $p^4$ into account. In this paper, we continue this paper by considering three other groups of order $p^4$.  It is proved that the group $$H_6=\langle x, y, z \mid x^{p^2}=y^p=z^p= 1, yx=x^{p+1}y, zx=xyz, yz=zy\rangle$$ is not capable. Moreover, if $p > 3$ is  prime and $d \not\equiv 0, 1 \ (mod \ p)$ then the following groups are not capable:\\{\tiny $H_7^1=\langle x, y, z \mid x^{9} = y^3 = 1, z^3 = x^{3}, yx = x^{4}y, zx = xyz, zy = yz \rangle$,\\$H_7^2= \langle x, y, z \mid x^{p^2} = y^p = z^p = 1, yx = x^{p+1}y, zx = x^{p+1}yz, zy = x^pyz \rangle,$ \\$H_8^1=\langle x, y, z \mid x^{9} = y^3 = 1, z^3 = x^{-3}, yx = x^{4}y, zx = xyz, zy = yz \rangle$,\\$H_8^2=\langle x, y, z \mid x^{p^2} = y^p = z^p = 1, yx = x^{p+1}y, zx = x^{dp+1}yz, zy = x^{dp}yz \rangle$.}
ON THE ROOTS OF TOTAL DOMINATION POLYNOMIAL OF GRAPHS, II
Authors: Alikhani Saeid , Jafari Nasrin
Published: March 2021

Let $G = (V, E)$ be a simple graph of order $n$. A  total dominating set of $G$ is a subset $D$ of $V$, such that every vertex of $V$ is adjacent to at least one vertex in  $D$. The total domination number of $G$ is  minimum cardinality of  total dominating set in $G$ and is denoted by $\gamma_t(G)$. The total domination polynomial of $G$ is the polynomial $D_t(G,x)=\sum_{i=\gamma_t(G)}^n d_t(G,i)$, where $d_t(G,i)$ is the number of total dominating sets of $G$ of size $i$. In this paper, we study roots of the total domination polynomial of some graphs.  We show that  all roots of $D_t(G, x)$ lie in the circle with center $(-1, 0)$ and radius $\sqrt[\delta]{2^n-1}$, where $\delta$ is the minimum degree of $G$. As a consequence, we prove that if $\delta\geq \frac{2n}{3}$,  then every integer root of $D_t(G, x)$ lies in the set $\{-3,-2,-1,0\}$.
ON A DESIGN FROM PRIMITIVE REPRESENTATIONS OF THE FINITE SIMPLE GROUPS
Authors: Rahimipour Ali Reza
Published: March 2021

In this paper we present a design construction from primitive permutation representations of a finite simple group G. The group G acts primitively onthe points and transitively on the blocks of the design. The construction has this property that with some conditions we can obtain t-design for t >=2. We examine our design for fourteen sporadic simple groups. As a result we found a 2-(176,5,4) design with full automorphism group M22.
FAULT-TOLERANT METRIC DIMENSION OF CIRCULANT GRAPHS
Authors: Seyedi Narjes , Maimani Hamid Reza
Published: March 2021

A set $W$ of vertices in a graph $G$ is called a resolving setfor $G$ if for every pair of distinct vertices $u$ and $v$ of $G$ there exists a vertex $w \in W$ such that the distance between $u$ and $w$ is different from the distance between $v$ and $w$. The cardinality of a minimum resolving set is called the metric dimension of $G$, denoted by $\beta(G)$. A resolving set $W'$ for $G$ is fault-tolerant if $W'\setminus \left\lbrace w\right\rbrace $ for each $w$ in $W'$, is also a resolving set and the fault-tolerant metric dimension of $G$ is the minimum cardinality of such a set, denoted by $\beta'(G)$. The circulant graph is a graph with vertex set $\mathbb{Z}_{n}$, an additive group of integers modulo $n$, and two vertices labeled $i$ and $j$ adjacent if and only if $i -j \left( mod \ n \right)  \in C$, where $C \in \mathbb{Z}_{n}$ has the property that $C=-C$ and $0 \notin C$. The circulant graph is denoted by $X_{n,\bigtriangleup}$ where $\bigtriangleup = \vert C\vert$. In this paper, we study the fault-tolerant metric dimension of a family of circulant graphs $X_{n,3}$ with connection set $C=\lbrace 1,\dfrac{n}{2},n-1\rbrace$ and circulant graphs $X_{n,4}$ with connection set $C=\lbrace \pm 1,\pm 2\rbrace$.
CURVES OF CONSTANT BREADTH ACCORDING TO DARBOUX FRAME IN GALILEAN SPACE G3>
Authors: Gun Bozok Hülya
Published: March 2021

In this work, the curves of constant breadth according to Darboux frame in the 3-dimensional Galilean Space are investigated. Firstly the curves of constant breadth according to Darboux frame are determined then the diﬀerential equation of the constant breadth curve with this frame is found. After that some special cases of this diﬀerential equation are researched.
A NEW CHARACTERIZATION OF CURVES IN MINKOWSKI 4-SPACE E_1^4
Authors: Kişi Ilim , Öztürk Günay , Arslan Kadri
Published: March 2021

In this study, we attend to the curves whose position vectors are written as alinear combination of their Serret-Frenet vectors in Minkowski 4-Space E_1^4. We characterize such curves with regard to their curvatures. Further, we get certain consequences of T-constant and N-constant types of curves in E_1^4.
FIXED POINTS FOR TWO PAIRS OF ABSORBING MAPPINGS IN WEAK PARTIAL METRIC SPACES
Authors: Popa Valeriu , Patriciu Alina-Mihaela
Published: March 2021

In this paper, a general fixed point theorem for two pairs of absorbing mappings in weak partial metric space, using implicit relations, has been proved.
f−BIHARMONIC CURVES WITH TIMELIKE NORMAL VECTOR ON LORENTZIAN SPHERE
Authors: Acet Bilal Eftal
Published: March 2021

In this paper, we study $f-$biharmonic curves as the critical points of the $f-$bienergy functional $E_{2}(\psi )=\int_{M}f\mid \tau (\psi )^{2}\mid \vartheta _{g}$, on a Lorentzian para-Sasakian manifold $M$. We give necessary and sufficient conditions for a curve such that has a timelike principal normal vector on lying a $4$-dimensional conformally flat, quasi-conformally flat and conformally symmetric Lorentzian para-Sasakian manifold to be an $f-$biharmonic curve. Moreover, we introduce proper $f-$biharmonic curves on the Lorentzian sphere $S_{1}^{4}.$
INEQUALITIES FOR GRADIENT EINSTEIN AND RICCI SOLITONS
Authors: Blaga Adara-Monica , Crasmareanu Mircea
Published: March 2021

This short note concerns with two inequalities in the geo\-me\-try of gradient Einstein solitons $(g, f, \lambda )$ on a smooth manifold $M$. These inequalities provide some relationships between the curvature of the Riemannian metric $g$ and the behavior of the scalar field $f$ through two quadratic equations satisfied by the scalar $\lambda $. The similarity with gradient Ricci solitons and a slightly generalization involving a $g$-symmetric endomorphism $A$ are provided.
DELTA^m STATISTICAL CONVERGENCE OF ORDER alpha FOR DOUBLE SEQUENCES OF FUNCTIONS
Authors: Çinar Muhamed , Et Mikail
Published: March 2021

In this paper, we introduce and examine the concepts of Delta^m pointwise and Delta^m uniform statistical convergence of order alpha for double sequences of real valued functions. Also we give the concept of Delta^m statistically Cauchy sequence for double sequences of real valued functions and prove that it is equivalent to Delta^m pointwise statistical convergence of order alpha for double sequences of real valued functions. Also some relations between S_alpha^ 2(Delta^m,f )-statistical convergence and strong [w_p^2]_alpha (Delta^m,f )-summability are given.
ON SOME TOPOLOGICAL PROPERTIES IN GRADUAL NORMED SPACES
Authors: Ettefagh Mina , Y. Azari Farnaz , Etemad Sina
Published: March 2021

In this paper, we have investigated some topological properties of sets in a given gradual normed space. We have stated gradual Hausdorff property and then,we have studied the relationship between gradual closed sets and gradual compact sets. Also, we have given a result about having the closure point for an innite set in a gradual normed space. In the end, we have provided some illustrative examples.
SOME STATISTICAL CONVERGENCE TYPES OF ORDER $\alpha$ FOR DOUBLE SET SEQUENCES
Authors: Ulusu Uğur , Gülle Esra
Published: March 2021

In this study, we have introduced the concepts of Wijsman statistical convergence of order $\alpha$, Hausdorff statistical convergence of order $\alpha$ and Wijsman strongly $p$-Ces\`{a}ro summability of order $\alpha$ for double set sequences. Also, we have investigated some properties of these concepts and examined the relationships among them.
k-TYPE SLANT HELICES FOR SYMPLECTIC CURVE IN 4-DIMENSIONAL SYMPLECTIC SPACE
Authors: Cetin Esra Cicek , Bektaş Mehmet
Published: March 2021

In this study, we have expressed the notion of $k$-type slant helix in $4$-symplectic space. Also, we have generated some differential equations for $k$-type slant helix of symplectic regular curves.
\eta-RICCI SOLITONS IN LORENTZIAN \alpha-SASAKIAN MANIFOLDS
Authors: Haseeb Abdul , Prasad Rajendra
Published: March 2021

In the present paper, we have studied $\eta$-Ricci solitons in Lorentzian \\ $\alpha-$Sasakian manifolds satisfying certain curvature conditions. The existence of $\eta-$Ricci soliton in a Lorentzian $\alpha-$Sasakian manifold has been proved by a concrete example.
EXISTENCE AND UNIQUENESS RESULTS FOR A COUPLED SYSTEM OF HADAMARD FRACTIONAL DIFFERENTIAL EQUATIONS WITH MULTI-POINT BOUNDARY CONDITIONS
Authors: Houas Mohamed , Melha Khellaf Ould
Published: March 2021

In this paper, we have studied existence and uniqueness of solutions for a coupled system of multi-point boundary value problems for Hadamard fractional differential equations. By applying principle contraction and Shaefer's fixed point theorem new existence results have been obtained.
ON f-KENMOTSU MANIFOLDS AND THEIR SUBMANIFOLDS WITH QUARTER SYMMETRIC METRIC CONNECTIONS
Authors: Sarkar Avijit , Biswas Nirmal
Published: March 2021

The object of the present paper is to study invariant submanifolds of f-Kenmotsu manifolds with respect to quarter symmetric metric connections. Some necessary and sufficient conditions for such submanifolds to be totally geodesic have been deduced. Also we construct an example of a submanifold of a five-dimensional f-Kenmotsu manifold to justify our results.
ON (p, q)-STANCU-SZÁSZ-BETA OPERATORS AND THEIR APPROXIMATION PROPERTIES
Authors: Mursaleen Mohammad , Al-Abied Ahmed Ahmed Hussin Ali , Khan Faisal , Salman Mohammed Abdullah
Published: March 2021

In the present paper, we introduce the generalized form of (p; q)-analogue of the Szász-Beta operators with Stancu type parameters. We derived the local approximation properties of these operators and obtained the convergence rate and weighted approximation.
CHARACTERIZATION OF ORDERED SEMIGROUPS BASED 0N (|;qk)-QUASI-COINCIDENT WITH RELATION
Authors: Khan Faiz Muhammad , Yufeng Nie , Khan Madad , Zhang Weiwei
Published: March 2021

Based on generalized quasi-coincident with relation, new types of fuzzy bi-ideals of an ordered semigroup S are introduced. Level subset and characteristic functions are used to linked ordinary bi-ideals and (2;2_(|;qk))fuzzy bi-ideals of an ordered semigroup S: Further, upper/lower parts of (2;2 _(|;qk))-fuzzy bi-ideals of S are determined. Finally, some well known classes of ordered semigroups like regular, left (resp. right) regular and completely regular ordered semigroups are characterized by the properties of (2;2_(|;qk))-fuzzy bi-ideals.