bluuebunny/crossref_metadata_2025 huggingface dataset:
Numerical Simulation of Gas Dynamics and Particle Behavior in Low-Temperature Oxygen Fuel Spray Process
Authors: Shen C.H. , Shan Y.G. , Jia L.B.
Published: March 2024

Low-temperature oxygen fuel (LTOF) spraying is a modification of the high-velocity oxyfuel (HVOF) process. By injecting room temperature gas into the mixing chamber, process temperature is reduced, allowing temperature-sensitive materials to be successfully deposited. In the LTOF process, the gas mixture is accelerated to supersonic speeds through a Laval nozzle. The purpose of this work is to establish a 2D mathematical model to simulate gas dynamics and particle behavior during LTOF spraying. The model is used to predict the temperature and velocity of flow fields and the heating and trajectory of in-flight particles for different gas mixes, mass flow rates, particle sizes, and injection conditions.
Parameter Optimization of Dry-Ice Blasting during Plasma Spraying Process by Characterizing CoNiCrAlY Coatings
Authors: Dong S.-J. , Song B. , Liao H.-L. , Coddet C. , Hansz B.
Published: March 2024

This study investigates the effect of dry-ice blasting distance on the deposition of CoNiCrAlY coatings obtained by plasma spraying. Dry-ice blasting was used before, during, and after spraying and its effect on coating quality was measured. The results show how blasting distance influences the deposition efficiency as well as the microstructure, porosity, adhesion strength, hardness, and oxide content of plasma-sprayed coatings. The optimal dry-ice blasting distance was proposed as 25 mm.
Deposition Behaviors of Fe-Based Amorphous Materials in Vacuum Kinetic Spraying Process
Authors: Kwon Juhyuk , Park Hyungkwon , Lee Changhee
Published: March 2024

The aim of this study is to better understand the bonding mechanism of coatings produced by vacuum kinetic spraying. Fe-based amorphous alloy was selected as the feedstock material because it exhibits brittleness, similar to ceramics, as well as plasticity, in contrast. Prior to spraying, the powder was ball milled to a sufficiently small size to form an aerosol state. The powder was then deposited on glass substrates using different gas flow rates to control the kinetic energy of sprayed particles. Powder size and coating thickness were measured, the phases in the powder and coatings were analyzed, and the microstructure of the coatings was examined. The results show that the plasticity of feedstock materials and the size of the powder have a major effect on deposition behavior during vacuum kinetic spraying.
Wear Resistant Coatings on Ball Valves for Coal-Slurry Pipelines
Authors: Pershin L. , Mostaghimi J. , Maknoni Afshin , Ma Y.S. , Gao Q. , Chang Z.D. , Liu H.B. , Wu Q.M.
Published: March 2024

This work deals with the selection and deposition of wear-resistant coatings for ball valves used in coal slurry pipelines. Several NiCrBSi and WC-CoCr powders were deposited on stainless steel substrates by various methods, including atmospheric plasma spraying (APS) with and without post-process fusion, plasma transferred arc (PTA) spraying, and high-velocity oxyfuel (HVOF). The HVOF deposits had very low porosity and uniform carbide distribution in the metallic matrix. WC-CoCr coatings obtained by HVOF spraying were dense and well-adhered and experienced the least amount of mass loss in wear testing. As a result, they were recommended for testing in coal-water slurry pipelines and continue to perform well after more than two years.
Computational Simulation for Gas Heater of Cold Spray System
Authors: Guosheng Huang , Daming Gu , Xiangbo Li , Lukuo Xing
Published: March 2024

This paper demonstrates the use of commercial simulation software to evaluate a new heater design for cold gas spraying. The gas heater consists of a heating unit and a self-cooling housing. The heating unit is a coiled tube encased in an insulating enclosure. The housing is a double-walled shell through which gas continually circulates, carrying heat away from the outer surface of the insulating enclosure. Simulation results indicate that there is no heat loss in the design as verified by experimental testing.
Increasing the Bearing Capacity of the Base of the Pile Heel
Authors: SHULIATIEV S.O. , SHULIATIEV O.A. , SHIKHRANOV P.G. , OREKHOV V.V. , ROZENTAL N.K.
Published: March 2024

The results of experimental studies of methods for increasing the bearing capacity of the base of the pile heel are presented, as well as the sediment-load dependences for two piles with a reinforced heel using various technologies and one pile without reinforcement are presented. In recent years, several ways have been developed to increase the bearing capacity of the base of the pile heel, research on which has been carried out to a limited extent. Nevertheless, the issue of accounting for the bearing capacity of the heel is currently very acute, as it can play a key role in determining the bearing capacity of piles and the total number of piles.
Accumulated Deformations of the Historical Development of St. Petersburg
Authors: SHASHKIN V.A.
Published: March 2024

An analysis of the deformations of the ordinary historical buildings of St. Petersburg, accumulated over the past 150–200 years, is presented. An effective way to assess the accumulated unevenness of sediments and rolls of historical buildings is proposed, which makes it possible to obtain a reliable idea of the shape of the deformation of the building. On the example of a representative sample of buildings from two central parts of the city, it is shown which forms of deformations prevail in the historical center. It was revealed that in half of the cases deformations occur in the form of bending in the longitudinal direction and roll of the facade walls outward in the cross section, which is most dangerous for buildings. The dependences of the relative unevenness of the settlement of historical buildings on the ratios of their length and width to height are given. The reasons for the formation of a characteristic type of deformations in the form of a bend are noted. The results of the assessment of the accumulated relative unevenness of sediments that buildings received in the course of their existence made it possible to establish that the accumulated deformations are more than an order of magnitude higher than the maximum permissible values for similar structures of new construction. At the same time, the operational suitability of buildings is maintained, which indicates their durability under the condition of constant maintenance and regular repairs. It is proposed to take into account the accumulated unevenness of settlement when assessing the category of technical condition of historical buildings and monuments. On the basis of on the conducted research, proposals are made to clarify the requirements of the current norms regarding the appointment of maximum additional deformations of brick historical buildings and cultural heritage sites.
Study of Polymer Matrices Based on Blends of Polyvinyl Chloride and Grafted Copolymers
Authors: KHUZIAKHMETOVA K.R. , ABDRAKHMANOVA L.A. , VALIEVA D.M.
Published: March 2024

The development of mixed matrices is a well-established and suitable method for obtaining new polymeric materials. The combination of two different types of polymers allows you to get a new and unique material that has the properties of both polymers. This paper compares polymer matrices based on polyvinyl chloride (PVC) and various graft copolymers in order to select the optimal compositions for further filling. Domestic acrylonitrile butadiene styrene (ABS) and imported acrylonitrile styrene acrylate (ASA) were chosen as graft copolymers. Despite the manufacturability of copolymers, the subsequent extrusion of filled compositions is more appropriate with a PVC/ABS matrix, since power consumption during processing will be reduced. At the same time, the matrix based on a mixture of PVC/ASA polymers has higher strength properties, but PVC/ABS has the best effect as an impact-resistant matrix. Depending on the content of the copolymer, the structure of compositions based on polymer mixtures can be microdispersed or viscous and layered, which will determine the main physical and mechanical properties. In general, both matrices can be used for further filling, but with a copolymer content of less than 50 phr.
Mesopotamia and the Garden of Civilizations
Authors: Lewis Patrick C. , Coelho José Rafael Medeiros
Published: March 2024

This article draws on ethnographic fieldwork and analysis of mass media to explore how public life is perceived and made by residents in Turkey's Syrian borderlands. Deploying two case studies from the ethnically and religiously diverse border provinces of Mardin and Hatay, we investigate how people in these borderlands contest and renegotiate terms of solidarity across multiple forms of social difference, considering how this process both responds to and is reflected in larger shifts in Turkey's politics, economy, and public culture. In addition, we explore how differently positioned actors practice manifold forms of identification and competing forms of political alignment, paying close attention to how “ideological axes of social differentiation” (Gal and Irvine 2019) are deployed in understanding and making relations of solidarity and difference.
Staging Presence for Spatial Dignity
Authors: Ravenscroft Margaret
Published: March 2024

In exploring the figuration and physical presence of Little Amal, a 12-foot Syrian girl puppet and main character in a moving piece of epic public theater titled The Walk, I consider the dueling realities of welcomeness and unwantedness, hypervisibility and invisibility, spatial dignity and spatial denial faced by refugee girls, real and represented. Accessing a feminist refugee epistemology, I position Amal in contrast to yet another symbol of refugee girlhood—popstar M.I.A.—to move away from the typical simultaneously superfluous and stunted representations of sanctuary-seeking girls and toward a provocation that accepts their creative and complex lifeworlds.
Girls Rule Art!
Authors: Cureton Ashley
Published: March 2024

Arts-based programs can provide space for forcibly displaced youth to process pre-migration and resettlement experiences creatively. While these programs can facilitate growth and healing, limited research addresses forcibly displaced girls’ perceived benefits of engaging in arts-based programs. Through in-depth interviews with 20 high school girls who resettled in a Midwest City in the United States, I explore this group's motivation to engage in arts-based activities like dance, drama, and theater. My findings suggest that participants engaged in arts-based programs to explore their artistic interests, connect with other girls with similar cultural identities, and manage feelings of homesickness and loss. I discuss how schools and community organizations can tailor arts-based programs to help forcibly displaced girls manage socio-emotional and educational needs.
Before the Last Car
Authors: Strouse A. W.
Published: March 2024

This article explores the early queer history of the Mexico City Metro (from its planning stages in the late 1960s—and especially the subway’s embeddedness in the political and sexual repression emblematized by the student massacres of 1968 and 1971—through its first decade of operation). Drawing evidence from a variety of sources—literary works, essays and chronicles, newspaper accounts, and popular music, as well as from biographies of the planners of the Metro—the article argues that, from its inception, the Metro was understood by the state and by sexual-political dissidents as a mechanism for political and sexual control. But as the Metro more efficiently connected upper-class neighborhoods with of barrios populares, the Metro gradually became a zone of queer rebellion.
A gastronomic product specific to the Caucasus region culinary: Khinkali (ხინკალი) & Hinkal
Authors: Oğan Yener , Keskin Mehmet Ali , Bulut Zehra
Published: March 2024

In this research paper, the characteristics of khinkali and hinkal, which are a type of food specific to the Caucasus region, were examined within the context of Turkish and Georgian culinary cultures. The qualitative research method was adopted in the research and the purposive sampling technique was preferred. Face-to-face interviews were held in Artvin and Tbilisi with a total of ten participants, five of whom fulfilled the condition of preparing in Turkish and Georgian cuisines. At the end of the interviews, the data obtained from the participants were interpreted by conducting content analysis. This type of called “hinkal” in Turkish cuisine and “khinkali” in Georgian cuisine. The common features of product consist of “being a traditional product, learning the preparation at an early age, preparing the dough in similar ways, being widely consumed in cold winter months, having 5-6 pieces per portion on average, taking care to prepare it during holidays, serving it to guests, preparing it with family members, and laborious and time-consuming nature of preparation”. The most obvious differences between khinkali and hinkal are that they are folded in a half-moon shape in Turkish cuisine, roasted beef is used as a filling and consumed with pickles, whereas in Georgian cuisine they are folded as a bundle, ground beef is used as the stuffing, and it is consumed with either alcoholic or non-alcoholic beverages by sprinkling black pepper on it. In the study, it was concluded that both product types should be considered as gastronomic products. Besides, it was thought that determining common and different aspects by conducting similar studies on Turkish and Georgian cuisines, which have interacted with each other throughout history, would contribute to the relevant literature.
Synthesis of Antenna Array Radiation Pattern at Large Scanning Angles Using Genetic Algorithm
Authors: Dmitrieva V. , Korovin K. , Likontsev A.
Published: March 2024

At present, in most modern communication systems, for example, in modern satellite terminals, the use of scanning beam antennas, i. e. antenna arrays is assumed. At the same time, at large scanning angles, the side lobe level (SLL) increases strongly and decrease in the gain is observed. In this regard, the problem of finding a procedure for synthesizing an amplitude-phase distribution (APD) with low SLL and high gain (G) at large scanning angles comes up. One of the ways to reduce SLL and compensate for the decrease in G is to synthesize the optimal APD (in terms of the maximum G and minimum SLL) using optimization algorithms. At the same time, taking into account the characteristics of the radiation pattern of the array emitters requires numerical electrodynamic calculation. The goal of this paper is to develop a procedure for the synthesis of APD with low SLL for linear and rectangular antenna arrays at various, including large, scanning angles and compensation for G reduction using a genetic algorithm and numerical electrodynamic calculation. The methods for studying the characteristics of antenna radiators are numerical electrodynamic modeling by the finite element method (FEM) in Ansys HFSS computer-aided design system and optimization of the APD  for a given radiation pattern(RP) by a random search method using partial diagrams of antenna elements. The novelty is the combination of accurate numerical electrodynamic calculation of the RP of antenna elements and optimization search for APD for the synthesis of the required RP using partial diagrams. As a result, a procedure for APD synthesis of linear and uniform rectangular equidistant (for example, 8- and 64-element) antenna arrays has been developed, taking into account the exact electrodynamic characteristics of antenna elements and their mutual resistance. Radiation patterns were obtained taking into account the effect of neighboring elements, with the help of which, using a genetic algorithm, APDs on emitters were found at different scanning angles. The change in SLL and G of the antenna array is analyzed at different scanning angles using different APDs. The proposed algorithm allows to synthesize APD for a RP with low SLL and high G at scanning angles up to 40° for linear antenna array and up to 80° in the case of a uniform rectangular antenna array. The results of this work are relevant in the problems of radiation pattern synthesis, since the proposed solution provides a significant gain in the radiation pattern synthesis rate of APD of linear and rectangular antenna arrays, especially for systems with a large number of antenna elements. At the same time, it is possible to maintain a high G at large scanning angles, and achieve a significant reduction of SLL.
PENGARUH BRAND IMAGE, PRICE DAN SOCIAL MEDIA MARKETING, TERHADAP PURCHASE DECISION PADA PRODUK SEPATU LOKAL DI KOTA BENGKULU
Authors: Ramadhan M Fikri Rizqi , Daulay M Yasser Iqbal
Published: March 2024

Indonesia merupakan salah satu dari empat negara produsen sepatu terbesar di dunia. Di sisi lain, merek sepatu  luar negeri yang terkenal juga banyak di Indonesia. Ventela merupakan salah satu brand sepatu lokal ternama di Indonesia. Konsumen lokal mempunyai 4.444 preferensi mengenai negara asal produsen sepatu. Penduduk setempat lebih suka membeli sepatu bermerek lokal jika mereka memiliki selera yang berorientasi etnis dan menyukai merek lokal. Oleh karena itu, penelitian ini bertujuan untuk mengetahui "Pengaruh brand image, price, dan social media marketing, terhadap purchase decision pada produk sepatu lokal di kota bengkulu". Penelitian dilakukan dengan menggunakan kuesioner online, dan dikumpulkan 220 masyarakat kota Bengkulu. Penelitian ini menggunakan SmartPLS untuk menguji validitas, reaibilitas dan uji Hipotesis. Hasil penelitian ini menunjukan bahwa brand image, price, dan social media marketing berpengaruh terhadap purchase decision
القتل الموجب للتعويض في الشريعة والقانون
Authors: الجميلي خالد رشيد
Published: March 2024

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مشكلات المرأة في الفكر العربي
Authors: الجابري علي حسين
Published: March 2024

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ظاهرة النينو المناخية
Authors: السامرائي قصي عبد المجيد
Published: March 2024

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حكمة المشرع في منح الاعفاء للزوج اذا قتل زوجته حال تلبسها بالزنا- دراسة مقارنة
Authors: ربيع عماد محمد , الداودي غالب
Published: March 2024

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الحاجات الأساسية التي تتطلع اليها المرأة العراقية لمرحلة ما بعد الحصار
Authors: الزبيدي كامل علوان , مجول فيصل سناء
Published: March 2024

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المؤرخ العربي في فجر الألفية الثالثة وتأملات في الواقع العربي في القرن الحادي والعشرين
Authors: عبد الواحد محمود محمود
Published: March 2024

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الطبيعة في صورة ابن زيدون الشعرية
Authors: مولود خلف محمد
Published: March 2024

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الغزو المعماري المعاصر للمورث العمراني في مدينة الموصل القديمة
Authors: حميد الجنابي صلاح
Published: March 2024

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الطاقة المائية في العراق
Authors: محمد حبيب عبد العزيز
Published: March 2024

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المرأة العراقية ومواجهة تحديات المرحلة الراهنة ( الحرب والعولمة )
Authors: جلال توفيق انعام
Published: March 2024

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قراءة جيدة في شعر قيس بن الخطيم
Authors: القيسي أيهم عباس
Published: March 2024

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العلاقات العامة في الأحزاب والقوى السياسية العراقية
Authors: الشمري علي جبار , الشافعي عبد المحسن سلمان
Published: March 2024

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أثر الحرب العالمية الأولى على العلاقات الأمريكية - المكسيكية
Authors: سبتي حسن علي
Published: March 2024

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الزلزال وأثرها على القدس خلال العصر العباسي
Authors: الدليمي زكية حسن ابراهيم
Published: March 2024

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مساهمات الرازي في الفكر الاقتصادي الاسلامي
Authors: هاشم سعاد قاسم
Published: March 2024

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ON Assessing vocabulary learning and teaching
Authors: Abed Ahmed Qadoury , Gharab Ali Muhsin
Published: March 2024

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The Transformation of Love into a Destructive Power in Poe's The Black Cat
Authors: Jawad Esraa Jalal
Published: March 2024

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ملاحظات في المعجمات المحقَّقة المطبوعة
Authors: ياسين محمد حسن آل
Published: March 2024

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اثر العروض العملية الصامتة في مستويات المعرفة الفيزيائية وعمليات العلم لدى طالبات الصف الرابع العام
Authors: مصطفى فدوى عباس
Published: March 2024

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نحو رؤية لدراسة أسلوبية الشعر العراقي الحديث (أنموذجاً)
Authors: إسماعيل جمال جليل
Published: March 2024

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الثابت والمتغير في فلسفة التاريخ
Authors: مطلك فضيلة عباس
Published: March 2024

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القول في شعر امرئ القيس بنيوية اللافظ وسردية الملفوظ
Authors: الغزي عواد كاظم
Published: March 2024

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الذال بين الاشارية والموصولية في اللغات الساميه
Authors: عبد الامير محمد علي
Published: March 2024

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الصراع الروسي -الانجليزي حول المضايق في 1911
Authors: التكريتي هاشم
Published: March 2024

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مظاهر الزواج في أدب عصر ما قبل الإسلام
Authors: كامل اسراء طارق
Published: March 2024

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فجر الحضارة العربية القديمة رؤية تاريخية حول حضارات الأقوام العربية العتيقة (عاد ، ثمود ، مدين) دراسة من خلال النصوص والمصادر
Authors: الغيث عبد الله أبو
Published: March 2024

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الجذور الفكرية لمسألة التقريب بين المذاهب الإسلامية دراسة مقاربة لواقع الدولة في العصر الإسلامي
Authors: علي علي حسين , قادر عامر سلطان
Published: March 2024

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تطور الفكر الجغرافي الحديث
Authors: عباس ناجي
Published: March 2024

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معنى الراي العام
Authors: محمد فاضل زكي
Published: March 2024

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لامية الطغرائي
Authors: الطاهر علي جواد
Published: March 2024

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نظرية التعريف والدراسة العلمية
Authors: خليل ياسين
Published: March 2024

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في التخطيط الاخلاقي
Authors: الخشاب احمد
Published: March 2024

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Pain and the Non-Pharmacological Management of Pain in People with Parkinson’s Disease
Authors: Allen Natalie Elizabeth , Romaliiska Oksana , Naisby Jenni
Published: March 2024

Pain is a distressing and universal experience, yet everyone’s pain experience is influenced by a complex array of biological, psychological, and social factors. For people with Parkinson’s disease (PwP), these biopsychosocial factors include neurodegeneration and the psychological and social factors that accompany living with a chronic, neurodegenerative condition in addition to the factors experienced by those in the general population (e.g., living with co-morbidities such as osteoarthritis). The way these factors influence each individual is likely to determine which pain management strategies are optimal for them. This review first describes pain and the biopsychosocial model of pain. It explores how pain is classified in Parkinson’s disease (PD) and describes the three main types of pain: nociceptive, neuropathic, and nociplastic pain. This background provides context for a discussion of non-pharmacological pain management strategies that may aid in the management of pain in PwP; exercise, psychological strategies, acupuncture and massage. While there is little PD-specific research to inform the non-pharmacological management of pain, findings from current PD research are combined with that from chronic pain research to present recommendations for clinical practice. Recommendations include assessment that incorporates potential biopsychosocial contributors to pain that will then guide a holistic, multi-modal approach to management. As exercise provides overall benefits for PwP, those with chronic pain should be carefully monitored with exercise prescribed and adjusted accordingly. Research is needed to develop and evaluate multi-modal approaches to pain management that are delivered in a biopsychosocial framework.
Safety assessment of the steel structures of nuclear power plants units considering special operation conditions
Authors: Shugaylo Oleksandr , Bilyk Serhii
Published: March 2024

Special operation conditions of steel structures nuclear power plants units (elevated temperature of the surrounding environment, the need to consider the simultaneous action of several episodic impacts etc.) require using of special approaches to their safety assessment. Among the wide variety of steel structures at nuclear power plantsunits, the supporting structures of equipment and pipelines play an essential role in ensuring its safety. At the same time, state building codes oriented towards traditional steel structures that are subjected to standard loads and impacts, and do not consider mensioned special operating conditions. Regulatory acts on nuclear and radiation safety in this aspect contain general regulatory requirements, which is due to the modern concept of the development of the regulatory-legal framework of Ukraine for ensuring the safety of nuclear plants. Therefore, the existing regulatory and methodological support does not sufficiently cover the aspects of safety assessment of supporting structures, taking into account the special operation conditions. The article proposes approaches to assessing the safety of equipment and pipelines supporting structures nuclear power plants units, which consider both the special operation conditions and the degree of responsibility for ensuring safety during and after seismic hazards.
Methods of calculation and engineering protection of critical infrastructure objects and other strategic facilities against long-range projectiles
Authors: Mykhailovskyi Denys , Skliarov Ihor
Published: March 2024

Relevance. One of the key areas of russia's military operations against Ukraine is the destruction of critical infrastructure objects (CIO) of strategic importance. The main types of enemy means for air strikes on CIO are air-launched, ground-launched and water-launched missiles, as well as barrage munitions. The vast majority of the CIO were built in Ukraine above ground, without any engineering structural protection systems to counter air threats, explosions or other impacts related to military operations. The importance of developing the most effective methods of engineering structural protection of the CIO from various types of projectiles as soon as possible was demonstrated by the experience of Ukraine's war with russia, in particular, the analysis of the significant impact of damage to the CIO in the energy sector. At present, Ukraine has a certain lack of regulatory data for designing reliable protective structures for CIO. The aim of this work is to develop a regulatory base for making calculations for the possible impact of various types of forceful effects from air strikes, terrorist attacks, etc. when designing the CIO and other strategic facilities. Currently, the issue of organising the defence of critical infrastructure and other strategic objects is being systematically addressed on the basis of the "Country-Fortress" principle, which provides for the organisation of echeloned air defence combined with comprehensive civil and engineering defence measures. In addition, it is necessary to provide for the reliable protection of existing facilities, taking into account the hazards and threats of today. The process of reducing the risks of damage to the CIO involves identifying threats, their comprehensive assessment, developing measures to reduce threats and their prompt implementation, followed by an assessment of the measures effectiveness. Results. The presented methods of risk assessment of critical infrastructure damage, methods of their engineering and analytical calculations and methods of engineering structural protection against ammunition of various types allow developing an effective integrated system of protection of strategically important objects. The article deals with both the protection of existing facilities and the design of new ones, taking into account the requirements for engineering protection and civil defence.
Determination of the stress-deformed state of the grinding circle adjustment pencil
Authors: Belmas Ivan , Bilous Olena , Tantsura Anna , Puzyretskyi Illia , Shablia Oleksandr
Published: March 2024

Using the Ery stress function in a linear formulation, using the methods of the classical theory of elasticity, an algorithm for analytically determining the stress-strain state of the working part of the abrasive wheel straightening tool as a two-layer composite material was developed. The algorithm allows considering arbitrarily distributed normal and tangential loads of the working surface of the abrasive grain of the tool. It considers the mandrel's limitation of deformations of the grain and the material that attaches it to it, the compatibility of the deformation of the grain and the material of its attachment to the mandrel, and their mechanical properties.
Calculations performed according to the obtained algorithm allowed the following to be established. The maximum standard stresses on the working face of the grain exceed the corresponding stresses on the opposite face due to their more uniform distribution. The tangential stresses are almost uniformly distributed along the specified face. The material connecting the grain to the tool mandrel deforms almost uniformly due to its lower modulus of elasticity and smaller thickness than the abrasive grain's modulus of elasticity and thickness. Determining the stress-deformed state of the executive part of the pencil for correcting the working surfaces of grinding wheels for abrasive processing of materials makes it possible to specify the known mechanism of their interaction and increase the efficiency of the technological process of restoring the working surfaces of the tool for abrasive processing of metals.
Taking into account the simultaneous deformation of the abrasive grain and the material that attaches it to the pencil mandrel, determining their stress-strain states using the methods of the classical theory of elasticity allows us to consider the results obtained by the given algorithm as sufficiently reliable within the limits of linear deformation. It is advisable to direct further research to determine the durability of the "abrasive grain-bond" system under variable cyclic loads.
Stability of cylindrical anisotropic composite shells under torsion in a three-dimensional formulation
Authors: Trach Volodymyr , Podvornyi Andrii
Published: March 2024

The article presents a calculation of the stability of non-thin cylindrical anisotropic layered shells under the action of end torsional moments in a spatial formulation. The anisotropy of the used material is characterized by one plane of elastic symmetry of characteristics. This is caused by the mismatch between the main elastic directions of the composite fibrous orthotropic material and the axes of the curvilinear cylindrical coordinate system.
A three-dimensional inhomogeneous system of partial differential equations describing the subcritical stress-strain state within the linear theory of elasticity is derived using the Hu-Washizu variational principle. Reducing the dimension of the problem under consideration from three-dimensional to one-dimensional is carried out by taking into account the axial symmetry of the deformation of the cylindrical shell and using the method of straight lines along the generatrix.
Based on the modified Hu-Washizu variational principle, a three-dimensional system of homogeneous partial differential stability equations is derived within the framework of the spatial theory of elasticity. The reduction of a three-dimensional system to a one-dimensional one is carried out along the generatrix and in the circular direction - by expanding the components of stresses and displacements into double trigonometric series when applying the procedure of the Bubnov-Galorkin method, as well as taking into account the periodicity of the resolving functions.
An algorithm has been developed, implemented in the form of application software packages for PCs. In it, in a single computational process using the numerical method of discrete orthogonalization in the direction normal to the middle surface of the shell, the establishment of the parameters of the subcritical stress-strain state and the solution on this basis of stability problems for non-thin anisotropic cylindrical shells under the influence of torsion are combined.
The problem of the influence on the stability of an anisotropic cylindrical non-thin shell of an increase in the number of cross-reinforced layers depending on the angle of rotation of the main directions of elasticity of the material and the direction of application of torque is considered. The obtained results of stability calculations according to the proposed approach were compared with critical torsion loads calculated using an orthotropic model for calculating anisotropic shells. It is shown that for single-layer cylindrical shells the difference between the compared results reaches 69%. An increase in the number of cross-reinforced layers leads to a decrease in this discrepancy, and with seven to eight layers, the difference between the critical loads obtained using the described approach and the orthotropic model is within 5%. This result is consistent with those obtained using classical or refined theories of calculations of both thin and non-thin anisotropic cylindrical shells.
Simulation of flood inflammation due to destruction of hydrotechnical structures
Authors: Kotsiuruba Volodymyr , Mykhailovskyi Denys , Cherevko Ruslan , Кamalov Yevhen , Proshchyn Ihor
Published: March 2024

The article presents  the new results of scientific researches of technical aspects of forecasting the consequences of emergencies related to hydraulic accidents.Based on the analysis of statistical data, the relevance of the raised issue of the need to improve the existing scientific and methodological apparatus to justify the parameters of the breakthrough wave and the flood zone in the event of destruction of hydraulic structures is substantiated. The attention is focused on the need to take into account the condition of ensuring the consumption of bulk mass of water before the restoration of its domestic level in the lower reaches of the water barrier.This condition is the basis of an improved method for determining the parameters of active and passive flooding of the area, based on a three-dimensional model of the longitudinal section of the breakthrough of the hydraulic structure and the parameters of the breakthrough wave.Based on the results of verification of the proposed methodology, calculations and modeling according to the initial data in accordance with the developed situation of destruction of the hydro unit, a conclusion about the feasibility of its use for forecasting emergencies during hydraulic accidents was made.
Purification of wastewater using domestic carbon adsorbents and conducting physico-chemical analysis of water composition
Authors: Kolpek А. , Kazankapova М. , Perdekhanova A.
Published: March 2024

Various strategies are being implemented to improve water use efficiency in the face of increasing world population and increasing demand for depleting fresh water sources. Wastewater treatment and reuse are effective strategies, especially if the treated water can be reused. Water scarcity is a growing global problem caused by a combination of factors such as population growth, climate change and unsustainable water management practices.

         This article presents the results of a study in the accredited analytical laboratory of the treatment facilities of the State Industrial Complex "Astana Su Arnasy", where wastewater was treated with domestic carbon-containing adsorbents (Shubarkol, Shoptykol, humic acid, carbon molecular sieves, carbon black) and were carried out with chemical water analysis. The results of this study showed that samples obtained on the basis of carbon materials can be used as adsorbents for purifying liquid media (from suspended solids, heavy metal salts, surfactants, petroleum products, etc.).
PERBANDINGAN PENGGUNAAN BABY CHICK FEEDER TRAY TERHADAP PERTAMBAHAN BERAT BADAN AYAM BROILER UMUR 1 MINGGU
Authors: Daniar Mohamad Ardan , Widyani Retno , Permadi Rudi
Published: March 2024

ABSTRAKPenelitian ini bertujuan untuk mengetahui sejauh mana pengaruh perbedaan tempat pakan antara baby chick feeder dengan feeder tray terhadap pencapaian berat badan ayam umur 7 hari. Penelitian dilaksanakan di peternakan Ayam Broiler Desa Windu Jaya Kecamatan Sedong Kabupaten Cirebon pada tanggal 10 Desember 2012 sampai 2 Januari 2013. Materi yang digunakan adalah 3100 ekor ayam broiler dengan strain Lohman yang dibagi menjadi 2 bagian yakni kelompok A dan B yang masing-masing terdiri dari 1550 ekor ayam broiler. Penelitian dilakukan dengan metode eksperimental. Perlakuan yang diberikan adalah kelompok A diberikan tempat pakan dengan menggunakan baby chick feeder dan kelompok B diberikan tempat pakan dengan menggunakan feeder tray, kemudian dicatat pencapaian berat badan ayam umur 7 hari dengan menggunakan uji f dan perbandingan. Hasil penelitian menunjukan bahwa penggunaan baby chick feeder dan feeder tray berpengaruh terhadap berat badan ayam broiler. Hal ini disebabkan penggunaan baby chick feeder lebih terjamin ketersedian pakan, kebersihan pakan dan palatabilitas ayam lebih baik, tidak adanya pakan yang tumpah jika dibandingkan dengan feeder tray.Kata Kunci : ayam broiler, baby chick feeder dengan feeder tray
HUBUNGAN ANTARA PENERAPAN PANCA USAHA TERNAK DENGAN PRODUKTIVITAS PEMBIBITAN DOMBA GARUT
Authors: Somanjaya Rachmat , Widianingrum Dini , Carta Ace
Published: March 2024

Penelitian mengenai hubungan antara penerapan panca usaha ternak dengan produktivitas pembibitan Domba Garut telah dilaksanakan dari tanggal 10 sampai dengan 30 September 2012 di Kecamatan Kasokandel Kabupaten Majalengka. Tujuan penelitian untuk mengetahui hubungan antara penerapan panca usaha ternak dengan produktivitas pembibitan Domba Garut di Kecamatan Kasokandel. Penelitian menggunakan metode survei. Data primer diperoleh dari 100 peternak Domba Garut di wilayah Kecamatan Kasokandel Kabupaten Majalengka. Data sekunder diperoleh dari Dinas Hutbunak dan BP3K Kasokandel. Data dianalisis dengan menggunakan rumus korelasi Rank Spearman dan kemudian diinterpretasikan menurut aturan Guilford. Hasil penelitian menunjukan bahwa penerapan panca usaha ternak di Kecamatan Kasokandel berada pada kategori sedang, yaitu dengan nilai rata-rata 40,6. Produktivitas pembibitan domba Garut di Kecamatan Kasokandel berada pada kategori baik dengan nilai rata-rata 5,32. Secara komulatif terdapat hubungan yang sangat kuat antara penerapan panca usaha ternak dengan produktivitas pembibitan domba Garut (rs = 0,845).
Kata kunci : Panca Usaha Ternak; Produktivitas Pembibitan Domba Garut.
Prevalensi Polimorfisme Gen CYP2C19 dan Pengaruhnya Dalam Metabolisme Omeprazole Sebagai Prediktor Intoksikasi Obat Pada Etnis Melayu Di Sumatera Selatan
Authors: Triwani  , Hayati Lusia , Yoga Franz Sinatra
Published: March 2024

Cytochrome P450 2C19 (CYP2C19) adalah suatu kompleks enzim yang berperan dalam metabolism beberapa jenisobat dan merupakan bagian dari super family sitokrom P450. Polimorfisme genetic pada enzim tersebut berhubungandengan munculnya fenotip metabolism buruk (poor metabolizer/PM dan intermediate metabolizer/IMs ) yangmempunyai kemampuan yang buruk dalam memetabolisme obat-obatan yang menjadi substratnya. Telah dilakukan analisis genotipe dan fenotipe menggunakan PCR-RFLP dan bioanalisis kadar omreprazole pada 30 orang subjek penelitian dari etnis Melayu yang tinggal di Sumatera Selatan. Marker yang digunakan untuk menilai adanyapolimorfisme pada gen CYP2C19 adalah dua situspolimorfik yaitu ekson 5 (CYP2C19*2) dan ekson 4 (CYP2C19*3). Pita-pita DNA berukuran 321 bp untuk ekson 5 dan 271 bp untuk ekson 4 akan dihasilkan setelah amplifikasi DNA dengan metode PCR pada kondisi denaturasi selama 5 menit pada suhu 95oC; dilanjutkan dengan 60 detik pada suhu 95oC, 60 detik pada suhu 53oC dan 60 detik pada suhu 72oC sebanyak 30 siklus; serta polimerisasi akhir selama 5 menitpada 72oC. Selanjutnya dilakukan pemotongan DNA menggunakan enzim restriksi endonuklease SmaI (CYP2C19*2)pada suhu 30oC dan BamHI (CYP2C19*3) dengan inkubasi pada suhu 37oC selama 3jam. Bioanalisis kadar omeprazole dalam darah dengan LC-MS. Hasil penelitian ini menunjukkan adanya polimorfisme pada kedua situs akanmenghilangkan situs pemotongan enzim SmaIdan BamHI. Hasil penelitian menunjukkan 46,7% populasi Melayu Sumatera Selatan tergolong sebagai PM yang terdiri atas 13,3% homozigot mutandan 33,4% heterozigot mutan.Tingginya fenotip PM enzim CYP2C19 pada etnis Melayu di Sumatera Selatan diprediksi akan mempengaruhi metabolisme obat-obatan yang menjadi substrat. Akan tetapi, berdasarkan analisa korelasi spearman, nilaikorelasi 0,035 dengan p = 0,875. Hal ini berarti bahwa antara polimorfisme gen CYP2C19 dan kadar omeprazole dalam darah terdapatkorelasi lemah dan tidak bermakna. Hasil penelitian ini memberikan gambaran polimorfisme genetik yang tinggi pasien sindrom dispepsia dari populasi Melayu, yaitu hampir setengah dari subjek penelitian (46,7%).Terdapat korelasi yang lemah dan tidak bermakna antara polimorfisme dan kadar omeprazole.
Analisis Penggunaan Metode Kontrasepsi pada Pasangan Usia Subur (PUS) di Provinsi Aceh Tahun 2016
Authors: Andriani Mutia , Anwar Samsul
Published: March 2024

Program Keluarga Berencana (KB) memiliki beberapa tujuan antara lainuntuk mengendalikan laju pertumbuhan penduduk, peningkatan kepedulian dan peran serta masyarakat melalui pendewasaan usia perkawinan, pengaturan kelahiran, pembinaan ketahanan keluarga, dan peningkatan kesejahteraan keluarga guna mewujudkan keluarga kecil, bahagia, dan sejahtera.Penelitian ini bertujuan untuk mengetahui apakah terdapat perbedaan rata-rata jumlah pengguna KB yang signifikan antar setiap metode kontrasepsiyang digunakan oleh Pasangan Usia Subur (PUS) serta untuk mengetahui metode kontrasepsi mana yang paling banyak digunakan di Provinsi Aceh. Pendekatan yang digunakan dalam penelitian ini adalah pendekatan kuantitatif. Data yang digunakan merupakan data sekunder yang diperoleh dari BKKBN (Badan Koordinasi Keluarga Berencana Nasional)Provinsi Aceh. Metode analisis data yang digunakan dalam penelitian ini adalah Analysis of Variance (ANOVA). Hasil analisis Anova menunjukkan bahwa terdapat perbedaan rata-rata jumlah pengguna KB yang signifikan antar keenam metode kontrasepsi yang digunakan di Provinsi Aceh dengan p-value< 0.001. Lebih lanjut, berdasarkan uji lanjut Tukey, diketahui bahwa metode kontrasepsi suntik merupakan metode kontrasepsi yang paling banyak digunakan di Provinsi Aceh pada tahun 2016.
Hubungan Lama Penyimpanan Sampel Arsip Jaringan dalam Blok Parafin Terfiksasi Formalin dengan Kualitas Hasil Ekstraksi DNA Mitokondria Jaringan
Authors: Hafy Zen , Larasati Venny , Puspita Riana Sari , S Novizar , M Haekal , A Rafdi , R Sentani
Published: March 2024

Sampel arsip jaringan terfiksasi formalin dalam blok paraffin atau Formalin-fixed paraffin-embedded (FFPE) menyediakan sumber materi biologis yang melimpah dalam studi molekuler saat ini. Kualitas asam nukelat, terutama mtDNA yang diekstraksi dari jaringan FFPE dapat dipengaruhi oleh waktu penyimpanan. Penelitian ini dilakukan untuk mengetahui apakah lama waktu penyimpanan jaringan FFPE mempengaruhi kualitas hasil ekstraksi mtDNA di Bagian Patologi Anatomi RSUP Dr. Mohammad Hoesin Palembang. DNA diekstraksi dari 16 sampel arsip FFPE yang diambil secara acak dari Laboratorium Patologi Anatomi RSUP dr. Mohammad Hoesin Palembang. Sampel tersebut dibagi menjadi dua kelompok berdasarkan lama waktu penyimpanan (kurang dari 1 tahun dan 1 sampai 5 tahun). Isolat DNA dari kedua grup diamplifikasi menggunakan PCR dengan dua primer mitokondria yag didisain khusus masing-masing sepanjang 320 pb dan 142 pb. Visualisasi hasil PCR dilakukan dengan metode elektroforesis. Tidak ada sampel dari kedua kelompok lama waktu penyimpanan yang dapat diamplifikasi dengan menggunakan primer sepanjang 320pb. Namun, hasil PCR menggunakan primer 142 pb menunjukkan hasil yang positif pada semua sampel dari kedua kelompok lama waktu penyimpanan. Penelitian ini mengisyaratkan bahwa kualitas mtDNA hasil isolasi dari sampel arsip FFPE yang ada di Bagian Patologi Anatomi RSUP Dr. Mohammad Hoesin Palembang tidak dipengaruhi oleh lamanya waktu penyimpanan arsip. Lebih lanjut, penelitian ini menunjukkan bahwa mtDNA yang diekstraksi dari sampel arsip FFPE sudah mengalami degradasi sehingga kurang baik bila digunakan untuk analisis genetik yang membutuhkan amplikon DNA yang Panjang.
Hubungan Pengetahuan Akseptor KB terhadap Pemakaian Kontrasepsi Implan di Kota Palembang Tahun 2017
Authors: Yusnilasari  , Ariani Debby Utami Siska
Published: March 2024

Data Dinas Kesehatan Kota Palembang tahun 2014, dari 16 kecamatan yang ada di Kota Palembang, terdapat 4kecamatan yang proporsi peserta KB baru implan 0%, yaitu Kecamatan Ilir Barat II, Plaju, Kalidoni dan Sematang Borang dimana dari 4 kecamatan tersebut memiliki 6 puskesmas dengan masing-masing proporsi peserta KB baru implan juga 0% yaitu Puskesmas Makrayu, Plaju, Bukit Sangkal, Kalidoni, Sei Selincah dan Sematang Borang.Penelitian ini bertujuan untuk mengetahui hubungan pengetahuan akseptor KB terhadap pemakaian kontrasepsi implan di Kota Palembang tahun 2017. Desain penelitian ini adalah survey analitik dengan pendekatan cross sectional. Populasi yang digunakan peneliti adalah akseptor KB yang berada di wilayah kerja Puskesmas Makrayu, Plaju, Bukit Sangkal, Kalidoni, Sei Selincah dan Sematang Borang Kota Palembang tahun 2017 dengan jumlah sampel 30responden. Teknik pengambilan sampel menggunakan pendekatan simple random sampling. Analisa bivariat menggunakan uji statistik chi square (α = 0,05). Instrumen yang digunakan untuk pengumpulan data adalah kuesioner yang disebar di 6 puskesmas di Kota Palembang. Hasil penelitian mendapatkan p value 0,002 < α (0,05), ini menunjukkan bahwa ada hubungan antara pengetahuan responden dengan pemakaian alat kontrasepsi implan di Kota Palembang tahun 2017. Hasil uji juga didapatkan nilai OR=3,143. Kesimpulan dari hasil penelitian ini adalah ada hubungan antara pengetahuan responden dengan pemakaian alat kontrasepsi implan di Kota Palembang tahun 2017.Diharapkan untuk membangun informasi positif tentang KB Implan dengan melibatkan peran kader kesehatan melalui kegiatan penyuluhan dan penyebaran informasi tentang keberhasilan pemakaian implan.
Hubungan Obesitas dengan Kadar Asam Urat Darah pada Mahasiswa Program Studi Pendidikan Dokter Fakultas Kedokteran Universitas Sriwijaya
Authors: Soputra Ezra Hans , Sinulingga Sadakata , Subandrate
Published: March 2024

Asam urat merupakan produk akhir katabolisme purin yang disintesis terutama di hati dan diekskresikan melalui saluran kemih. Meningkatnya kadar asam urat darah dapat menyebabkan banyak penyakit seperti gout artritis, hipertensi dan penyakit ginjal. Individu dengan obesitas cenderung memiliki laju ekskresi ginjal yang lebih rendah dan mengalami peningkatan produksi asam urat. Penelitian ini dilakukan untuk mengetahui hubungan obesitas dengan kadar asam urat darah.Penelitian dengan rancangan cross-sectional ini mengambil sampel sebanyak 119 mahasiswa Program Studi Pendidikan Dokter Fakultas Kedokteran Universitas Sriwijaya dengan cara consecutive sampling. Berat badan, tinggi badan dan kadar asam urat kemudian diambil menggunakan alat ukur yang sesuai, dikategorikan dan diproses sesuai tujuan penelitian.Penelitian menemukan bahwa 27,5% perempuan dan 10,3% laki-laki memiliki hiperurisemia. Sebesar 39,3% mahasiswa obesitas dan 16,5% mahasiswa non-obesitas memiliki kadar asam urat tinggi. Hasil analisis bivariat bahwa obesitas dan jenis kelamin berhubungan dengan kadar asam urat (p=0,022 dan p=0,035 berturut-turut). Setelah dilakukan analisis multivariat, faktor yang berpengaruh terhadap kadar asam urat adalah obesitas. Obesitas memiliki hubungan yang signifikan terhadap kadar asam urat.