bluuebunny/crossref_metadata_2025_split huggingface dataset:
A note on the ternary purely exponential diophantine equation Ax + By = Cz with A + B = C2
Authors: kizildere Elif , le Maohua , Soydan Gökhan 
Published: August 2020

AbstractLet l,m,r be fixed positive integers such that 2| l, 3lm, l > r and 3 | r. In this paper, using the BHV theorem on the existence of primitive divisors of Lehmer numbers, we prove that if min{rlm2 − 1,(l − r)lm2 + 1} > 30, then the equation (rlm2 − 1)x + ((l − r)lm2 + 1)y = (lm)z has only the positive integer solution (x,y,z) = (1,1,2).
Some properties of harmonic numbers
Authors: Wu Bing-Ling , Yan Xiao-Hui 
Published: August 2020

AbstractLet Hn be the n-th harmonic number and let vn be its denominator. It is known that vn is even for every integer . In this paper, we study the properties of Hn and prove that for any integer n, vn = en(1+o(1)). In addition, we obtain some results of the logarithmic density of harmonic numbers.
Numerical solution of linear differential equations by Walsh polynomials approach
Authors: György Gát  , Toledo Rodolfo 
Published: August 2020

AbstractIn 1975 C. F. Chen and C. H. Hsiao established a new procedure to solve initial value problems of systems of linear differential equations with constant coefficients by Walsh polynomials approach. However, they did not deal with the analysis of the proposed numerical solution. In a previous article we study this procedure in case of one equation with the techniques that the theory of dyadic harmonic analysis provides us. In this paper we extend these results through the introduction of a new procedure to solve initial value problems of differential equations with not necessarily constant coefficients.
On sharpening of inequalities for a class of polynomials satisfying p(z)≡znp(1/z)
Authors: Dhankhar Ritu , Govil Narendra Kumar , Kumar Prasanna 
Published: August 2020

AbstractLet be a polynomial of degree n. Further, let and . Then according to the well-known Bernstein inequalities, we have and . It is an open problem to obtain inequalities analogous to these inequalities for the class of polynomials satisfying p(z) ≡ znp(1/z). In this paper we obtain some inequalites in this direction for polynomials that belong to this class and have all their coefficients in any sector of opening γ, where 0 γ < π. Our results generalize and sharpen several of the known results in this direction, including those of Govil and Vetterlein [3], and Rahman and Tariq [12]. We also present two examples to show that in some cases the bounds obtained by our results can be considerably sharper than the known bounds.
On star Lindelöf spaces
Authors: Xuan Wei-Feng , Song Yan-Kui 
Published: August 2020

AbstractIn this paper, we prove that if X is a space with a regular Gδ-diagonal and X2 is star Lindelöf then the cardinality of X is at most 2c. We also prove that if X is a star Lindelöf space with a symmetric g-function such that {g2(n, x): n ∈ ω} = {x} for each x ∈ X then the cardinality of X is at most 2c. Moreover, we prove that if X is a star Lindelöf Hausdorff space satisfying Hψ(X) = κ then e(X) 22κ; and if X is Hausdorff and we(X) = Hψ(X) = κsubset of a space then e(X) 2κ. Finally, we prove that under V = L if X is a first countable DCCC normal space then X has countable extent; and under MA+¬CH there is an example of a first countable, DCCC and normal space which is not star countable extent. This gives an answer to the Question 3.10 in Spaces with property (DC(ω1)), Comment. Math. Univ. Carolin., 58(1) (2017), 131-135.
Descartes’ rule of signs, Rolle’s theorem and sequences of compatible pairs
Authors: Cheriha Hassen , Gati Yousra , Kostov Vladimir Petrov 
Published: August 2020

AbstractConsider the sequence s of the signs of the coefficients of a real univariate polynomial P of degree d. Descartes’ rule of signs gives compatibility conditions between s and the pair (r+,r−), where r+ is the number of positive roots and r− the number of negative roots of P. It was recently asked if there are other compatibility conditions, and the answer was given in the form of a list of incompatible triples (s; r+,r−) which begins at degree d = 4 and is known up to degree 8. In this paper we raise the question of the compatibility conditions for , where (resp.) is the number of positive (resp. negative) roots of the i-th derivative of P. We prove that up to degree 5, there are no other compatibility conditions than the Descartes conditions, the above recent incompatibilities for each i, and the trivial conditions given by Rolle’s theorem.
TOKSİK LİDERLİĞİN ÜRETKENLİK KARŞITI İŞ DAVRANIŞLARI VE İŞTEN AYRILMA NİYETİ ÜZERİNDEKİ ETKİSİNE YÖNELİK BİR MODEL ÖNERİSİ
Authors: AKCA İhsan , TUZCUOĞLU Ferruh 
Published: August 2020

Bilgi çağı olarak nitelendirilen günümüz iş hayatında çalışanların örgütsel sürdürülebilirlik için taşıdığı önem oldukça fazladır. İnsan unsurunun üretim faktörlerinin en değerlisi haline gelmesi bu önemi arttırmaktadır. Çalışanların örgütsel süreçler için gayret ve çaba göstermesinde onları etkileyecek liderlik yaklaşımlarının olması bireysel ve kurumsal performansı ve tatmini arttırmaktadır. Bu kapsamda çalışan davranışlarının örgütsel çıktılar üzerinde belirleyici olması araştırmacıları davranışsal tutumlar üzerine çalışmalar yapmaya yöneltmektedir. Son yıllarda popüler bir kavram olarak ele alınan toksik liderlik, örgütler ve çalışanlar için istenmeyen bir unsur olarak kabul edilmektedir. Toksik liderliğin çalışan davranışlarını ve tutumlarını olumsuz yönde etkileyebileceği düşüncesi bu çalışmada yer alan model önerisinin temelini oluşturmaktadır. Yıkıcı ve yıpratıcı bir liderlik türü olan toksik liderliğin üretkenlik karşıtı iş davranışlarının oluşumunu hızlandırması beklenmektedir. Ayrıca toksik liderliğin çalışanların örgütte kalma istekliliklerini azaltarak bireyleri işten ayrılma niyetine yönlendirebileceği öngörülmektedir. Bu çalışmada toksik liderlik, üretkenlik karşıtı iş davranışları ve işten ayrılma niyeti değişkenleri kavramsal olarak ele alınmış ve bu değişkenler arası ilişkileri ortaya çıkarmak üzere araştırma soruları oluşturulmuştur.
The experience with repetitive peripheral magnetic stimulation in subjects with lumbosacral radiculopathy
Authors: Blokhina V. N. , Kopachka M. M. , Troshina E. M. , Kanshin D. S. , Nikolaev S. G. 
Published: August 2020

Introduction. Lumbosacral radiculopathy is а leading cause of long-term disability. Taking into a consideration the duration of treatment radiculopathy, the risk of developing adverse reactions when taking analgesics, non-steroidal anti-inflammatory drugs, the physiotherapeutic method — repetitive peripheral magnetic stimulation may become a promising method of therapy.Aim of the study. Assessment of the effectiveness of the complex treatment for patients with lumbosacral radiculopathy using the course of the repetitive peripheral magnetic stimulation.Materials and methods. Forty patients with lumbosacral radiculopathy were enrolled in the open non-randomized study, were divided into 2 parallel groups. The patients of the 1st group received a course of traditional treatment and a course of the repetitive peripheral magnetic stimulation. The patients of the 2nd group were treated with the traditional treatment without the course of the stimulation. A magnetic stimulator MagPro (Magventure, Denmark) was used for repetitive peripheral magnetic stimulation.Results. A significant difference (p <0.001) was registered regarding the reduction of pain syndrome and the improvement of the functional status after treatment in both groups. 14 (70 %) patients of the first group achieved a pain visual analogue scale relief by 50 % after 10 repetitive peripheral magnetic stimulation sessions, while 6 (30 %) patients did this after 15 repetitive peripheral magnetic stimulation sessions. We did not observed a statistically significant differences (p >0.05) in pain syndrome, functional status, anxiety level at the end of follow-up between the groups.Conclusion. We did not receive the benefits of the repetitive peripheral magnetic stimulation course in comparison with a traditional treatment of a lumbosacral radiculopathy. Further placebo-controlled studies to study the effect of repetitive peripheral magnetic stimulation on pain and anxiety in patients with back pain and radiculopathy are required.
Nerve ultrasound in the assessment of cross-sectional area in healthy children
Authors: Bedova M. A. , Klimkin A. V. , Voitenkov V. B. , Skripchenko N. V. 
Published: August 2020

Introduction. Nerve ultrasound continues to progress due to improved technical equipment and knowledge, but so far not enough research has been done to determine the normative values of the cross-sectional area in children, and the obtained results differ between laboratories and researchers.Aim of the study. To determine the normative values of peripheral nerves» cross-sectional area in children 5–18 years old.Materials and methods. High resolution nerve ultrasound of brachial plexus, median, ulnar, radial, femoral, sciatic, tibial and peroneal nerves was performed in 30 children in real time. Nerve trunks were visualized throughout the limb from both sides. The cross-sectional area of the nerves was measured by a manual tracing method with the rounding of the hypoechogenic contours of the nerve trunk. Nerves’ crosssectional area was measured at distal and proximal sites. The obtained data were statistically processed using Excel and Statistica 10.Results. No bilateral cross-sectional area’s differences were found in children. Boys had significantly thicker nerves compared to girls, older age group (13–17 years old) compared to younger ones. There was a significant correlation between cross-sectional area of the median nerve at the level of the wrist, sciatic nerve and children’ height and weight.Conclusions. The normal values of cross-sectional area in children can be used in the practical work of a neurologists, neurophysiologists and ultrasound technicians.
Adaptogens: modern realities and prospects for the search of new effective and safe medicines (review of literature and authors’ research)
Authors: Nekrasa Ivan Anatolevich , Bibik Elena Yu. , Frolov Konstantin A. , Dotsenko Viktor V. , Krivokolysko Sergey G. 
Published: August 2020

In present medical practice adaptogens and antihypoxants are a promising, but still insufficiently studied group of medicines. The largest evidence base among plant adaptogens was developed for ginseng, aralia, eleutherococcus, lemongrass, rhodiola, leuzea, sterculia. Antihypoxants, like trimetazidine, meldonium, succinic and -aminobutyric acid medications are included in the clinical guidelines. They have the most pronounced antihypoxic effects in a variety of diseases and pathological conditions, accompanied by impaired energy metabolism in the tissues. But their effect is not always high due to the variety of etiological factors causing hypoxia.
Tetrahydropyrido[2,1-b][1,3,5]thiadiazine derivatives characterized by various pharmacodynamic effects with low toxicity which opens up prospects for a detailed further study. In animal experiments, the most pronounced adaptogenic and antidepressant effects is exerted by compounds TD-0348 and TD-0479, superior in strength to the antihypoxants used in modern clinical practice, the classic plant adaptogen ginseng.
Natriuretic response to hypervolemia and injection of diuretics in patients with chronic heart failure
Authors: Frolov Dmitrij S. , Shustov Sergej B. , Sveklina Tatyana S. , Sardinov Ruslan T. , Saluhov Vladimir V. 
Published: August 2020

Relevance. The article analyze the results of changes in the diuretic and natriuretic response to standard hypervolemic load and the injection of a diuretic in patients with chronic heart failure with preserved and reduced left ventricular ejection fraction.
Purpose. Evaluation of changes in the natriuretic response to hypervolemia and diuretic injection in patients with chronic heart failure.
Materials and methods. 25 men with chronic heart failure were examined; the average age was 68 y. o. (67; 73). Of these, 13 patients with chronic heart failure and a left ventricular ejection fraction (LVEF) of less than 50 % entered the first studied group and 12 patients with chronic heart failure with preserved LVEF (more than 50%), who entered the second studied group. In all the patients, hypervolemia was induced by Ringers solution, followed by the injection of furosemide and the registration of diuresis and natriuresis.
Results. When analyzing natriuresis in the studied patients, it was found that at the same concentration of serum sodium, there is a multidirectional reaction to the excretion of sodium in the urine in both groups. At the same time, the rates of diuresis in both groups did not differ significantly.
Conclusion. Thus, with chronic heart failure and reduced LVF less than 50% patients had a lower natriuresis compared to those studied with preserved LVF. In the patients with chronic heart failure fluid overload on the mixed response it is noted that if the urine sodium level is at the lower limit of normal in patients with reduced LVF less than 50%, then, against the background of stimulation of diuresis, sodium begins to be excreted more intensively. In the patients with chronic heart failure with preserved LVF, the urine sodium level is at the upper limit of the norm and when furosemide is stimulated, there is a decrease in its excretion.
Risk factors for cardiovascular complications in patients with left breast cancer in daily clinical practice
Authors: Poroshina Elena G. , Vologdina Irina V. , Zhabina Razifa M. , Stanzhevsky Andrey A. , Krasilnikova Larisa A. 
Published: August 2020

Purpose. Detection of adherence to a healthy lifestyle (HLS) and evaluation of behavioral risk factors for cardiovascular complications (CVC), including psychosocial, in patients with left breast cancer at the stage of chemoradiotherapy in daily clinical practice.
Materials and methods. The patients were hospitalized for 3D conformal radiation therapy on the bed of the left breast with a total radiation dose (TRD) of 39 Gy (equivalent to 48 Gy of conventional fractionation). All the patients had a Madden mastectomy at the previous stages followed by doxorubicin therapy at a cumulative dose not exceeding 360 mg/m2. Determination of all components of a healthy lifestyle was carried out according to the data of interviewing the participants. The risk category of cardiovascular complications was assessed according to the SCORE scale. Additional characteristics including psychosocial factors were assessed. The examination included ECG and echocardiography.
Results. At the initial examination, 58% of middle-aged patients and 74% of elderly patients showed comorbidity, while 18% of middle-aged patients and 29% of elderly patients had multiple comorbidities. Low adherence to healthy lifestyle in the patients was primarily associated with low physical activity due to the existing pain syndrome caused by both the tumor process itself and the surgical intervention. Physical activity in both groups was significantly lower than in the general population. High risk of CVC was significantly more common in the elderly patients. Systolic and diastolic dysfunction as a manifestation of cardiotoxicity after the previous stage of doxorubicin therapy were detected in middle-aged patients in 35.7% of the cases, in the elderly patients in 56.5% of the cases (HR 0.643, 95% CI 0.470-0.880). Psychosocial factors such as acute chronic stress and family problems were the most common. All the examined patients showed moderate reactive anxiety. The elderly patients showed a high level of personal anxiety.
Conclusions. The obtained data suggest that in breast cancer patients, low adherence to HLS is primarily associated with low physical activity and unhealthy diet and to a much lesser extent smoking, which is of great importance in the formation of a healthy lifestyle in these patients in the future. In elderly patients, the study significantly more often identified risk factors such as obesity, high blood pressure, hypercholesterolemia and hyperglycemia. These patients revealed increased level of personal anxiety. This highlights the need for an expanded study of not only the main but also additional risk factors.
Characteristics Of Treating Arabic Grammar In Educational Books For Russian Orientalists/ خصائص معالجة النحو العربي في كتب تعليمية للمستشرقين الروس
Authors: Yakşi Mukarama 
Published: August 2020

This study aimed to identify the characteristics of grammatical rules treatment in educational books of Russian orientalists in teaching the Arabic language. Because of the rare study, this topic. This paper analyzes and evaluates one of the books of teaching Arabic grammar to non-Arabic speakers. It aims to reveal its different aspects in organizing and using grammatical rules, determining what is useful for them in teaching Arabic grammar to help in using the target language, and making some recommendations that contribute to this. The results are indicating that the book's treatment of grammatical rules is distinctly different. That follows the functional progression and focuses on the treatment of the similarities and differences between the grammatical of Arabic and Russian languages. Furthermore, it is interesting to provide how to use the rules, so that the learner can gradually form compound and straightforward sentences, which helps him use the target language.
Corporation's Criminal Liability in Indonesia: A Response to the Weak Enforcement of Corporate Social Responsibility
Authors: Kurniawan Syukri , Disemadi Hari Sutra 
Published: August 2020

Corporate Social Responsibility (CSR) is a corporate commitment to contribute to sustainable economic development by focusing on the balance between attention to economic, social, and environmental aspects. This paper argues that corporations are subject to criminal law, which can be subject to criminal liability if they do not carry out CSR obligations. This study aims to find out the linkage of sanctions arrangements and the urgency of regulations on criminal liability if the corporation does not carry out CSR obligations. In practice, CSR is only based on corporate awareness and commitment. In the meantime, CSR enforcement's most basic weakness is the absence of strict sanctions for corporations that deny CSR, especially in terms of criminal sanctions. Instead, the sanction is limited to administrative as set out in Act No. 25/2007 on Investment, with a lack of legislation governing criminal sanctions against CSR prevention. In so doing, there is a need to introduce sanctions against corporations that deny CSR, by taking into account adverse impacts to the environment and community.
KEYWORDS: Corporate Social Responsibility, Criminal Liability, Corporations.
DEVELOPMENT OF ASSESSMENT INSTRUMENTS BASED ON HOTS AT SURABAYA VOCATIONAL HIGH SCHOOL
Authors: Hartono Rudi , Pahlevi Triesninda 
Published: August 2020

This study aims to produce assessment instruments according to Higher Order Thinking Skills (HOTS) in General Administration subjects at Basic Competencies 3.9 The Implementation of Office Layout, and 3.10 The Implementation of Communication in the Workplace as many as 40 items of multiple-choice, and to decide the feasibility level of the questions in measuring students' HOTS based on the validation results from the material expert, evaluation expert, and linguist. This study is Research and Development (R&D) adapted Sugiyono's development model that has been adopted into 5 stages: potential and problems, data collection, product design, design validation, and design revision. Then, the research instruments used by the researcher were the validation sheet from the expert of material, evaluation, and the linguist. Furthermore, the validation result from the material expert was 98.3% (very strong). Besides, the validation result of the evaluation expert was 100% (very strong). Moreover, the validation results from the linguist were 98.7% (very strong). Therefore, the average validation result was 99% with the interpretations of criteria were "very strong" and feasible to use. In conclusion, the development of assessment instruments based on HOTS at Surabaya vocational high school was feasible to use in measuring students' HOTS.
Keywords: An Assessment Instrument Development, General Administration, HOTS.
A STUDY ON SELF PERCEIVED ASSESSMENT SKILLS OF BASIC EDUCATION SCHOOL TEACHERS
Authors: Yar Zar Chit  
Published: August 2020

The main of this study was to investigate the self-perceived assessment skills of basic education teachers. A total of 228 teachers from primary, middle and high schools (public and private schools) at Pyawbwe Township in Myanmar participated in this study. Descriptive research design and survey method were used in this study. An instrument: Self-Perceived Assessment Skills Questionnaire was used to collect required data. According to the results, there were significant differences in teachers’ constructing, administering assessment skills, and performance assessment skills by gender at 0.05 levels. Similarly, there were also significant differences in teachers’ grading skills and overall self-perceived assessment skills by gender at 0.01 levels. Besides, it was also found that there were significant differences in teachers’ performance assessment skills and grading skills by school type at 0.05 levels. Moreover, in the comparison of teachers’ self-perceived assessment skills by position, the mean score of junior teachers is the highest and the mean score of primary teachers is the lowest. Similarly, in the comparison of teachers’ self-perceived assessment skills by service, the mean score of teachers who have above 30-years service is the highest. Finally, this study expects that the school administrators can get any idea to recover and promote the teachers’ assessment skills with the cooperation of experts.
Fronteras autonómicas y áreas protegidas: un análisis de tres reservas de la biosfera en la interfaz entre Galicia, Asturias y León
Authors: Vila Lage Roberto , Paül Carril Valerià , Trillo Santamaría Juan Manuel 
Published: August 2020

Durante las últimas décadas, se ha declarado un elevado número de áreas protegidas transfronterizas (APT). Una de las categorías más destacadas son las reservas de la biosfera transfronterizas. Estas APT suelen concebirse en el marco de las fronteras internacionales; sin embargo, estos instrumentos pueden ser también aplicados en el caso de fronteras internas —entendidas, en este estudio, como los límites administrativos que separan las comunidades autónomas (CCAA)–. Este artículo procura trasladar las bases teóricas de la conservación transfronteriza a tres reservas de la biosfera situadas en el límite entre Galicia, Asturias y León. Se trata de la Reserva de la Biosfera de Río Eo, Oscos y Terras de Burón; la Reserva de la Biosfera de Os Ancares Lucenses e Montes de Cervantes, Navia e Becerreá; y la Reserva de la Biosfera de los Ancares Leoneses. A través de técnicas de investigación cualitativas, mediante la realización de entrevistas semiestructuradas a actores destacados de esos territorios, se analiza la percepción sobre el funcionamiento de esta figura. Esta investigación revela que la cooperación horizontal entre CCAA sigue siendo débil y que contar con dispositivos de gestión conjunta no garantiza el éxito en su funcionamiento.