bluuebunny/crossref_metadata_2025 huggingface dataset:
การพัฒนาหลักสูตรฝึกอบรมเพื่อเพิ่มความสามารถในการจัดกิจกรรมเสริมหลักสูตรวิชาภาษาอังกฤษ สำหรับนักศึกษาครู วิชาเอกภาษาอังกฤษ มหาวิทยาลัยราชภัฏมหาสารคาม
Authors: ระวิพันธ์ พิฐชญาณ์ , สุจารี ทิพาพร , จันทชุม ณัฏฐชัย , Samano Pawaris
Published: October 2024

ภูมิหลังและวัตถุประสงค์: การจัดกิจกรรมเสริมหลักสูตรวิชาภาษาอังกฤษ มีความจำเป็นอย่างยิ่งที่ครูต้องมีความเข้าใจในการสอนภาษาและวัฒนธรรมไปพร้อมๆกัน เพื่อส่งเสริมวัฒนธรรมของชนชาติเจ้าของภาษานำสู่ความเข้าใจอันดีดังนั้นผู้สอนจึงจำเป็นต้องสร้างความเข้าใจและเตรียมความพร้อมเยาวชนสู่สังคมโลกสมัยใหม่ เพื่อให้สอดคล้องกับหลักสูตรแกนกลางการศึกษาขึ้นพื้นฐาน ผู้วิจัยจึงเล็งเห็นแนวทางแก้ปัญหาด้วยกิจกรรมเสริมหลักสูตรที่มีความสำคัญและจำเป็นมากในปัจจุบัน การวิจัยครั้งนี้มีวัตถุประสงค์เพื่อ 1. ศึกษาข้อมูลพื้นฐานและความต้องการในการพัฒนาหลักสูตรฝึกอบรม 2. พัฒนาหลักสูตรฝึกอบรม 3. นำหลักสูตรฝึกอบรมไปใช้ และ 4. ประเมินหลักสูตรฝึกอบรม
ระเบียบวิธีการวิจัย: การวิจัยแบ่งเป็น 4 ระยะได้แก่ ระยะที่ 1 การศึกษาข้อมูลพื้นฐานและความต้องการในการฝึกอบรม ระยะที่ 2 การพัฒนาหลักสูตร ระยะที่ 3 การนำหลักสูตรไปใช้และ ระยะที่ 4 การประเมินหลักสูตร กลุ่มตัวอย่างที่ใช้ในระยะที่ 1 ได้แก่ นักศึกษาครูจำนวน 108 คน และกลุ่มผู้ให้ข้อมูลในการสนทนากลุ่ม คือผู้เชี่ยวชาญและอาจารย์ผู้สอนจำนวน 11 คน ได้มาด้วยการเลือกแบบเจาะจง กลุ่มเป้าหมายที่ใช้ในระยะที่ 2 เป็นผู้ให้ข้อมูลในการสัมมนาผู้เชี่ยวชาญจำนวน 7 คน ระยะที่ 3 เป็นกลุ่มเป้าหมายจำนวน 30 คน และระยะที่ 4 คือผู้เข้ารับการฝึกอบรม และผู้เชี่ยวชาญ จำนวน 37 คน เครื่องมือที่ใช้ในการเก็บรวบรวมข้อมูลได้แก่ แบบสอบถาม แบบประเมินความสอดคล้องและความเหมาะสมของหลักสูตร แบบประเมินกิจกรรมและแบบทดสอบ สถิติที่ใช้ในการวิจัยข้อมูล ได้แก่ค่าเฉลี่ยส่วนเบี่ยงเบนมาตรฐาน และค่าร้อยละ
ผลการวิจัย: (1) สภาพปัจจุบันปัญหาเกี่ยวกับความสามารถในการจัดกิจกรรมเสริมหลักสูตรของนักศึกษาครูมีปัญหาร้อยละ 83 และมีความต้องการฝึกอบรมร้อยละ 91 และจากการสนทนากลุ่มของผู้เชี่ยวชาญและอาจารย์มีความคิดเห็นสอดคล้องกันคือ นักศึกษาครูควรได้รับการพัฒนาด้านการจัดกิจกรรมเสริมหลักสูตรวิชาภาษาอังกฤษทั้งด้านวิชาการและด้านภาษาและวัฒนธรรม รวมทั้งการวัดและการประเมินผล (2) การพัฒนาหลักสูตรฝึกอบรม พบว่าหลักสูตรฝึกอบรมมีองค์ประกอบทั้งหมด 7 องค์ประกอบคือ (2.1) ความเป็นมาและความสำคัญของปัญหา (2.2) หลักการของหลักสูตร (2.3) จุดมุ่งหมายของหลักสูตร (2.4) เนื้อหาของหลักสูตร (2.5) กิจกรรมการฝึกอบรม (2.6) สื่อและอุปกรณ์ (2.7) การวัดและการประเมินผล ส่วนผลของการประเมินความเหมาะสมของหลักสูตรโดยรวมอยู่ในระดับมาก และมีความสอดคล้องโดยรวมอยู่ในระดับมาก ซึ่งมากกว่าเกณฑ์ที่กำหนดคือ 3.5 ขึ้นไป จึงถือว่าหลักสูตรฝึกอบรมมีคุณภาพ สามารถนำไปพัฒนาต่อได้ (3) การนำหลักสูตรฝึกอบรมไปใช้ พบว่า คะแนนการจัดกิจกรรมระหว่างและการทดสอบหลังการฝึกอบรมของผู้เข้ารับการฝึกอบรม สูงกว่าเกณฑ์ 80 ร้อยละ 100 และความพึงพอใจที่มีต่อหลักสูตรฝึกอบรม อยู่ในระดับระดับมาก (4) การประเมินหลักสูตรฝึกอบรม ตามความคิดเห็นของผู้เชี่ยวชาญ และผู้ใช้หลักสูตร จำนวน 37 คน อยู่ในระดับมากที่สุด พบว่าโดยรวมประสิทธิภาพของหลักสูตร อยู่ในระดับมากที่สุด
สรุปผล: การศึกษาชี้ให้เห็นถึงความจำเป็นที่ชัดเจนในการเพิ่มความสามารถของครูนักเรียนในการวางแผนกิจกรรมนอกหลักสูตร โดยมีอัตราปัญหา 83% และความต้องการการฝึกอบรม 91% ทักษะของผู้เข้าร่วมได้รับการปรับปรุงอย่างมีประสิทธิผลด้วยโปรแกรมการฝึกอบรมที่ออกแบบมา ซึ่งถือว่ามีความเหมาะสมและสอดคล้องกันมาก โดยเห็นได้จากระดับความพึงพอใจและคะแนนที่เกินเกณฑ์ 80%
Съединените щати, планът Маршал и проблемите на европейското единство
Authors: Стоянов Борис
Published: October 2024

Проучването изследва променящото се отношение на Съединените щати към европейското обединение в края на 40-те години на ХХ век. Първоначално безразлични, САЩ в крайна сметка приемат европейския проект като ключов аспект на външната си политика. Тази промяна настъпва през 1947 г., когато САЩ признават многобройните ползи от европейската интеграция. С настъпването на Студената война САЩ обвързват интересите си със сигурността и стабилността на Западна Европа, разглеждайки я като демократичен и проспериращ регион. САЩ смятат Западна Европа за надежден партньор в глобалната свободна търговия и ограничаването на комунизма. Администрацията използва икономическите инструменти на плана „Маршал“, за да подкрепи създаването на Съединени европейски щати, като крайната стратегическа цел е да се постигне политическа федерация в бъдеще. Специално внимание е отделено на усилията на висши американски дипломати и политици да убедят Конгреса на САЩ и европейските партньори в ползите от интеграцията, както и на реакцията на западноевропейците на призивите за наднационално обединение, идващи отвъд Атлантика.
Кадрови проблеми в Историческия факултет през 1972 – 1982 г.
Authors: Огнянов Любомир
Published: October 2024

Статията е посветена на първоначалната история (1972 – 1982) на Историческия факултет на СУ „Св. Климент Охридски”. Акцентира се върху кадровото развитие на факултета през посочения период. Анализират се някои процеси и събития, отразени в публикуваните спомени на Илчо Димитров, Николай Генчев, Николай Тодоров и Петър Петров.
Фаталното докосване на демона Ламащу
Authors: Мукарзел Кабалан
Published: October 2024

Настоящата статия изследва някои описания на докосването от конкретен демон – Ламащу. Докосването, винаги споменавано с неговите последствия, е засвидетелствано главно в две групи писмени източници: ритуални заклинания и медицински писания. Специално внимание е отделено на глаголите, като основен граматичен инструмент за изразяване на действие.Заклинанията описват докосването с голям брой глаголи с различни значения. Разнообразие се наблюдава и в описанията на по-високо, фразеологично ниво. В тези текстове докосването е посочено като причина за широк семантичен диапазон от трагични събития като щети, неочаквана смърт и болести, които засягат както природата, така и хората, особено децата. Всички описания в заклинанията са изразени чрез използването на богат и образен литературен стил, повлиян от традициите в този вид литература. Използваните тук термини и фрази функционират като част от единна система от понятия с ритуално-етичен характер. В рамките на тази система докосването се определя като демонична атака. Медицинските текстове описват докосването с помощта на по-малък брой глаголи с по-тесен семантичен диапазон. В тези източници описанията на докосването на фразеологично ниво се изразяват предимно с две формулни фрази, свързани с ръката на демона и нейното име или епитет. Докосването се посочва като причина за различни заболявания при възрастни и деца, характеризиращи се със симптоми като нестабилна телесна температура, треска, болки в корема, жажда, непрекъснат плач (за бебета). Стилът на всички описания в медицинските писания е повлиян от техния прогностичен и диагностичен характер. Термините и фразите функционират тук като елементи също на единна система от понятия, но нейният характер е по-скоро патологичен и анатомичен. В рамките на тази система докосването на Ламащу се определя като диагноза. Двете групи текстове изразяват две паралелни гледни точки за дейността на демона, тъй като са съставени с различни практически цели. Въпреки това всички източници описват докосването като фатален акт, последван от болезнени последици за всички жертви.
A Comprehensive Analysis of Online Examination Frameworks and their Applicability to Open and Distance Learning in Namibia
Authors: Amakali Victoria Magano , Shalyefu Rakel Kavena , Asino Tutaleni I.
Published: October 2024

Demand for effective assessment methods in Open and Distance Learning (ODL) is rising due to its adaptable, inclusive approach to diverse student populations. Online examination frameworks have become essential tools for ODL. This study involved a scoping review of current online examination frameworks for ODL to establish how they are implemented in higher education institutions and identify the challenges of applying them in Namibia. Data from six electronic databases for the period 2017-2022 was collected using a scoping review methodology. Of the 97 articles identified, only ten satisfied the inclusion criteria. Six relevant online examination frameworks for ODL were identified and recommendations are made to adapt these for Namibian higher education institutions offering ODL.
DIAMOND VERTICAL PN SCHOTTKY DIODES WITH PRESISION NITROGEN-DOPED n- LAYER
Authors: Timoshenko Vera O. , Prikhodko Dmitrii D. , Tarelkin Sergey A. , Kornilov Nikolay V. , Luparev Nikolay V. , Golovanov Anton V.
Published: October 2024

In this work, we carried out the experiments to optimize vertical Schottky pn diodes with a nitrogen concentration in the n- layer of <10 ppb by varying the boron concentration in the substrate and the layer thickness. Schottky pn diodes were manufactured, representing a boron-doped diamond substrate with a thickness of 250 – 300 μm and linear dimensions of 2.5 – 4 mm, obtained by the temperature gradient method at high pressure and temperature, on which a low nitrogen doped layer with a thickness of approximately 5 μm and a nitrogen concentration of ~1 – 10 ppb was deposited. The concentration of boron in the substrate varied from 2 to 100 ppm. The area of the electrical contacts was 6.25 mm2.We investigated the current-voltage and capacitance-voltage characteristics of the diodes. The volt-farad characteristics showed the independence of the capacitance of diodes on the locking voltage, which indicates a complete depletion of the drift layer of the diode. This confirms that these diodes are pn Schottky diodes. The maximum integral forward current value was limited by the substrate resistance and amounted to 0.1 A at 10 V, with a Schottky contact area of 6.25 mm2. This is significantly lower than the record characteristics of diamond Schottky diodes. In addition, a direct relationship between the concentration of boron in the grown layer and the concentration of boron in the substrate was revealed. Thus, it is concluded that in order to achieve the lowest possible concentrations of donor centers in the n- layer and to prevent their overcompensation by acceptors, it is necessary to use boron-doped substrates with a boron concentration of ~1017 cm-3.
For citation:
Timoshenko V.O., Prikhodko D.D., Tarelkin S.A., Kornilov N.V., Luparev N.V., Golovanov A.V. Diamond vertical pn Schottky diodes with presision nitrogen-doped n- layer. ChemChemTech [Izv. Vyssh. Uchebn. Zaved. Khim. Khim. Tekhnol.]. 2024. V. 67. N 10. P. 73-79. DOI: 10.6060/ivkkt.20246710.11y.
HARD CARBON BASED ON PHENOL FORMALDEHYDE RESIN AS AN ANODE MATERIAL FOR SODIUM ION BATTERIES
Authors: Urvanov Sergey A. , Nasraoui Mariem , Filimonenkov Ivan S. , Mordkovich Vladimir Z.
Published: October 2024

This work is devoted to the development of anode material for sodium-ion batteries. Non-graphitizable carbon as known as hard carbon is most often used as such a material in research, since, unlike the situation with the problematic intercalation of sodium ions into graphite, here they can intercalate into pseudographitic domains and be reversibly adsorbed on surface edges, defects and nano-sized pores. In this research, samples of material for the anodes of sodium-ion batteries based on hard carbon obtained by carbonization under different conditions of a resol-type phenol-formaldehyde resin with a molar ratio of reagents of 1:1 were prepared and studied. Two series of experiments were carried out on the synthesis of ten anode materials: in which the effect of carbonization temperature (1000/1100/1200/1400 °C) and the effect of exposure time at a temperature of 1100 °C (30/60/90/120/180/240 min) were studied. All obtained materials are subjected to grinding and sifting to obtain a powder with a particle size of no more than 80 μm. The manufactured materials were studied by transmission electron microscopy, scanning electron microscopy and Raman spectroscopy. As a result of electrochemical measurements, it was found that the carbonization temperature of phenol-formaldehyde resin greatly affects the discharge capacity of the final material, which increases to 311 mAh/g in the first cycle when moving from 1000 to 1100 °C and then decreases. On the other hand, the dependence of capacity on exposure time is also not monotonic and has a certain optimum around 180 min. In all cases, the Coulombic efficiency in the first cycle varies from 70 to 85% and exceeds 80% for the sample held for 180 min at the temperature of 1100 °C.
For citation:
Urvanov S.A., Nasraoui M., Filimonenkov I.S., Mordkovich V.Z. Hard carbon based on phenol formaldehyde resin as an anode material for sodium ion batteries. ChemChemTech [Izv. Vyssh. Uchebn. Zaved. Khim. Khim. Tekhnol.]. 2024. V. 67. N 10. P. 80-87. DOI: 10.6060/ivkkt.20246710.12y.
MONOCRYSTALLINE DIAMOND MEMBRANES WITH A THICKNESS OF 10 MICRONS, MANUFACTURED BY PLASMA ETCHING
Authors: Golovanov Anton V. , Yun Maxim I. , Bondarenko Maria G. , Prosin Andrei A. , Tarelkin Sergey A.
Published: October 2024

New applications of high-quality synthetic diamond in sensors and integrated photonic circuits, which are being rapidly developed nowdays, often demand freestanding diamond membranes with a thickness of about 10 microns as a substrate. However, the process of thin single-crystal diamond membranes fabrication, as well as their subsequent processing are challenging due to the high hardness, chemical resistance and brittleness of the material. Our work demonstrates a method for creating freestanding diamond membranes mounted on a thick diamond substrate using reactive ion etching of single-crystalline diamond wafers in plasma with mechanical protective masks. The optimal thickness of a diamond wafer for membranes etching is determined in the range from 100 to 120 µm with mandatory plane-parallel polishing of the sides. We experimentally studied the interaction of RF discharge SF6 based plasma with diamond surface during deep etching with mechanical protective masks of various shapes. It was found that the use of thick masks leads to an uneven rate of diamond etching over the entire area of the formed membrane. We have assessed ion sputtering resistance of various mask materials in SF6 based plasma, and found the most promising mask materials for deep diamond etching (steel, copper, diamond). We have fabricated diamond membranes with a thickness of 11,5 µm (and more), mounted on a durable 60 µm (and more) thick frames, and studied their characteristics. After etching membrane surface roughness was less than 25 nm, and the unevenness of their thickness did not exceed 20%. Also, we compare different methods for controlling the depth of diamond etching and the thickness of the resulting membranes, including mechanical measurements, IR spectral reflectometry, optical profilometry and electron microscopy.
For citation:
Golovanov A.V., Yun M.I., Bondarenko M.G., Prosin A.A., Tarelkin S.A. Monocrystalline diamond membranes with a thickness of 10 microns, manufactured by plasma etching. ChemChemTech [Izv. Vyssh. Uchebn. Zaved. Khim. Khim. Tekhnol.]. 2024. V. 67. N 10. P. 55-64. DOI: 10.6060/ivkkt.20246710.1y.
POLYVINYL CHLORIDE BASED CARBON PASTE FOR SCREEN PRINTING OF ELECTRODES
Authors: Gryaznova Marina I. , Lugvishchuk Dmitry S. , Karaeva Aida R. , Mordkovich Vladimir Z.
Published: October 2024

This paper describes various compositions of electrically conductive pastes based on polyvinyl chloride, which are suitable for screen printing technology. These pastes are composite systems consisting of finely dispersed particles of a conductive filler, specifically various carbon modifications. These carbon particles are uniformly dispersed within a polymer binder. Electrically conductive carbon pastes therefore consist of three main components: the conductive carbon filler, the polymer binder, and a solvent. Other modifying or stabilizing additives can also be used in the paste, depending on the specific application. The paper investigates the optimal ratio of these components in pastes, specifically between the selected polymer binder (polyvinyl chloride) and the total amount of carbon fillers (graphite and carbon black). This allows to obtaine relatively high-quality electrodes with low electrical resistance. To further search of the minimum possible electrical resistivity value at the selected polyvinyl chloride concentration, an additional set of experiments was conducted with varying ratios of both carbon fillers. The results of a comparative analysis of the surface of the manufactured electrodes using scanning electron microscopy are presented, showing the difference in coating quality based on the composition. It is demonstrated that, in order to meet the required objectives, it is possible to produce electrically conductive carbon pastes with specific properties. Factors that lead to defects affecting both the screen printing process and final printed products are discussed. A unique graph illustrating the correlation between the possibility of screen printing the developed electrically conductive carbon paste and the final electrical resistivity values of the electrodes based on them is provided.
For citation:
Gryaznova M.I., Lugvishchuk D.S., Karaeva A.R., Mordkovich V.Z. Polyvinyl chloride based carbon paste for screen printing of electrodes. ChemChemTech [Izv. Vyssh. Uchebn. Zaved. Khim. Khim. Tekhnol.]. 2024. V. 67. N 10. P. 99-104. DOI: 10.6060/ivkkt.20246710.3y.
INVESTIGATION OF FLUORINATED DOUBLE-WALL CARBON NANOTUBES
Authors: Karaeva Aida R. , Khaskov Maxim A. , Kurzhumbaev Didar Zh. , Kulnitskiy Boris A. , Mordkovich Vladimir Z.
Published: October 2024

Experimental results of investigation of the original and fluorinated ultra-long double-walled carbon nanotubes (DWCNTs) with a length of at least 1000 μm are presented. The degree of fluoridation did not exceed 27 at.%. It has been shown that the process of fluorination of samples of double-walled carbon nanotubes deforms the outer surface of the nanotube wall although does not destroy its internal concentric structure, while the diameter of the fluorinated nanotube increases by 1.5-2 times. In addition, the fluorinated samples, which were thermochemically purified from iron particles and other forms of carbon before fluorination, demonstrated many split/cut ends of nanotubes. The effect of fluorination on the electrical properties of initial and purified samples of double-walled carbon nanotubes was studied. It was revealed that with an increase in temperature from 80 to 300 K for non-fluorinated and fluorinated purified nanotube samples, the resistivity decreases, which corresponds to the semiconductor nature of the conductivity. It was also revealed that when a sample of initial DWNT is fluorinated, a change in the nature of conductivity from semiconductor to metallic is observed. With an increase in temperature from 80 to 300 K, the resistance of the non-fluorinated sample of the original DWNTs decreased by 45%, while the resistance of the fluorinated sample increased by 11%. Despite the decrease in electrical conductivity as a result of fluorination of the purified samples, all samples remained conductors, which presumably indicates partial fluorination of the outer wall of the DWNTs while maintaining the structure of the inner wall. Thus, fluorination of double-walled carbon nanotubes with a well-aligned and concentric structure leads to the formation of fluorocarbon nanostructures, which can be promising materials for electronic nanodevices.
For citation:
Karaeva A.R., Khaskov M.A., Kurzhumbaev D.Zh., Kulnitskiy B.A., Mordkovich V.Z. Investigation of fluorinated double-wall carbon nanotubes. ChemChemTech [Izv. Vyssh. Uchebn. Zaved. Khim. Khim. Tekhnol.]. 2024. V. 67. N 10. P. 38-48. DOI: 10.6060/ivkkt.20246710.4y.
FUNCTIONAL MATERIALS BASED ON HARD CARBON DOPED WITH MOLYBDENUM: PREPARATION AND CHARACTERIZATION
Authors: Saenko Nikita S. , Zheleznov Veniamin V. , Mayorov Vitaly Yu. , Opra Denis P.
Published: October 2024

Hard carbon is one of the most promising candidates for a negative electrode material for sodium-ion batteries. Now, the design and adaptation of methods for producing hard carbon have gained wide attention in terms of not only ensuring the required electrochemical performance but also reducing production costs and expenses. Herein, we report a method for preparing new functional materials based on hard carbon doped with molybdenum. A viscose was used as a carbon precursor because of its low cost and availability, which made it possible to scale the technology. An ammonium molybdate aqueous solution was applied as the molybdenum source. The synthesis involves following main steps: impregnation of the fiber with a solution of ammonium molybdate and annealing at high temperatures under controlled atmosphere. The study investigates the effects of the type of initial viscose raw material (microfiber, technical thread, non-woven material), molybdenum content (Mo/C weight ratio varied in the range up to 5.1%), temperature (up to 1050 °C), and annealing atmosphere (argon or nitrogen) on the structural parameters, specific surface area, and yield of hard carbon products. The doped hard carbon has an almost 10% higher yield in comparison with the undoped one. It was shown that doping with molybdenum, due to the catalytic effect, stimulates the growth and ordering of graphite-like nanoclusters under the temperature, inducing the structure formation of hard carbon. This leads to a decrease in the temperature of hard carbon production as compared to analogues. It was found that changing the specific surface area with temperature depends on the molybdenum content. The lowest values of specific surface area were found for doped samples synthesized at 1050 °C.
For citation:
Saenko N.S., Zheleznov V.V., Mayorov V.Yu., Opra D.P. Functional materials based on hard carbon doped with molybdenum: preparation and characterization. ChemChemTech [Izv. Vyssh. Uchebn. Zaved. Khim. Khim. Tekhnol.]. 2024. V. 67. N 10. P. 122-130. DOI: 10.6060/ivkkt.20246710.7019.
PROSPECTS FOR USING A COBALT CATALYST FOR FISHER-TROPSCH SYNTHESIS BASED ON SYNTHETIC SILICA ALUMINA
Authors: Sineva Lilia V. , Asalieva Ekaterina Yu. , Gryaznov Kirill O. , Mordkovich Vladimir Z.
Published: October 2024

The possibility of the use of commercially available silica-alumina hydrate Siral-40, containing 40 wt.% of SiO2, in the composition of a composite cobalt Fischer–Tropsch synthesis (FTS) catalyst was studied. The use of silica aluminas may become a new promising direction in the development of catalysts for a shortened technological chain based on the use of bifunctional catalysts that make it possible to eliminate the hydroprocessing stage. In addition, such catalysts can be useful for expanding the range of products obtained, including those unconventional for single-reactor Fischer–Tropsch synthesis. The initial silica alumina powder was pretreated in air flow at different temperatures to adjust the concentration of acid cites on its surface. The initial and calcined powders were studied using X-ray diffraction analysis, IR spectroscopy and sorption methods. The catalysts were investigated by diffraction and sorption methods. It has been shown that an increase in the calcination temperature of the initial Siral-40 powder leads to a decrease in the specific surface area and pore volume of catalysts based on it, with temperatures above 900 °C having the greatest effect. The synthesized catalysts were active in FTS, and the composition of the obtained C5+ hydrocarbons depended more on the properties of the Siral-40 powder than the catalytic performance. The composition of C5+ hydrocarbons, obtained in the presence of all investigated catalysts contained at least 60% of diesel fraction and more than 30% of wide base oil fraction. Thus, synthetic amorphous silica aluminas are a promising component for new Fischer–Tropsch synthesis catalysts, which make it possible to obtain a wide range of products without the use of a deep hydroprocessing stage in the technological chain.
For citation:
Sineva L.V., Asalieva E.Yu., Gryaznov K.O., Mordkovich V.Z. Prospects for using a cobalt catalyst for Fisher-Tropsch synthesis based on synthetic silica alumina. ChemChemTech [Izv. Vyssh. Uchebn. Zaved. Khim. Khim. Tekhnol.]. 2024. V. 67. N 10. P. 88-98. DOI: 10.6060/ivkkt.20246710.7y.
ambivalencias del orientalismo. Percepciones sociales sobre China y los/as migrantes chinos/as en la Ciudad de Buenos Aires
Authors: Denardi Luciana Emilia , Badaró Máximo Carlos , Wang Zigang
Published: October 2024

En los últimos años, la República Popular China (RPC) ha adquirido mayor presencia en gran parte de los países de América Latina. En los medios de comunicación de la región, la valoración de este país tiende a ser negativa. Del mismo modo, las referencias mediáticas sobre los/as inmigrantes chinos/as fluctúan entre el exotismo y su asociación con prácticas ilegales o irregulares. Sin embargo, los estudios sobre las imágenes de este país en la sociedad argentina todavía son muy escasos. Para contribuir a revertir esta carencia, en 2021 realizamos una encuesta con el método IVR (interactive voice response) a 1.476 personas mayores de 16 años en la ciudad de Buenos Aires, con el objetivo de identificar sus imágenes y opiniones sobre China, las relaciones entre Argentina y China y los/as inmigrantes chinos/as radicados/as en la Argentina. Los resultados permiten dar cuenta de la multiplicidad de sentidos que adquieren las referencias a “China” y “los/as chinos/as” en los/as habitantes de la ciudad de Buenos Aires; de que la expansión global de la RPC no es uniforme ni unívoca, y de que las representaciones sobre dicho país y los/as migrantes chinos/as han comenzado a cambiar, por los altos porcentajes de imagen positiva recabados.
EPIDÉMIOLOGIE DES CANCERS UROLOGIQUES AU SERVICE D'UROLOGIE ET ANDROLOGIE DE L'HÔPITAL CENTRAL DE YAOUNDÉ
Authors: Fouda Jean Cedrick
Published: October 2024

Introduction Les cancers urologiques sont fréquents et se répartissent inégalement à travers le monde. En Afrique, ils représentent environ 8 à 40 % de l’ensemble des cancers selon les études. Ainsi, nous nous sommes proposé d’étudier le profil épidémiologique des cancers urologiques dans le service d’Urologie et d’Andrologie de l’Hôpital Central de Yaoundé. Méthodologie Nous avons mené une étude observationnelle portant sur des dossiers cliniques des patients porteurs des tumeurs malignes de l’appareil urogénital avec preuve histologique dans le Service d’Urologie et d’Andrologie de l’Hôpital Central de Yaoundé sur une période de 13 ans (2009-2021). Résultats Les cancers urologiques représentent 26% de notre pratique hospitalière avec une prédominance masculine pour un sexe ratio de 9/10. L’âge moyen était de 57±8,4 ans. Le cancer de la prostate était le premier cancer soit 90,9 % des cas suivi du cancer de la vessie (6,3 %) puis le cancer du rein (1,6%). Conclusion Les tumeurs uro-génitales concernent essentiellement le sujet masculin et sont dominés par le cancer de la prostate. Il serait intéressant d’ouvrir un registre de cancer.
ACTIVITE ANTI-INFLAMMATOIRE D’UN EXTRAIT DE CEIBA PENTANDRA SUR L’ŒDEME AIGU DE LA PATTE DE RAT INDUIT PAR LA CARRAGHENINE
Authors: SENE Mbaye
Published: October 2024

Ceiba pentandra est fréquemment employée en médecine traditionnelle africaine pour traiter diverses affections inflammatoires. Notre étude visait à évaluer l'activité anti-inflammatoire d'un extrait sec hydroéthanolique de la poudre des feuilles, reconstitué avec de l'eau physiologique. Le modèle d'œdème inflammatoire de la patte de rat induit par la carraghénine a été utilisé. Les rats ont reçu l'extrait à une dose de 10 mg/kg, tandis que l'acide acétylsalicylique (10 mg/kg) servait de référence et l'eau physiologique (1 ml/100 g) de témoin. Après administration orale, l'extrait a significativement prévenu l'œdème de la patte de rat à la 3ième et à la 5ième heure (p < 0,05). Ainsi, l'augmentation du pourcentage d'œdème inflammatoire de la patte était respectivement de 19,58 ± 9,48 %, 38,09 ± 12,04 % et 42,51 ± 10,77 % à 1 h, 3 h et 5 h après l'injection de carraghénine. Ces résultats démontrent que l'extrait de feuilles de Ceiba pentandra possède une activité anti-inflammatoire, justifiant ainsi son utilisation en médecine traditionnelle africaine pour prévenir ou traiter l'inflammation.
ETUDE DU MECANISME D’ACTION ANTIDIABETIQUE DE L’EXTRAIT TOTAL HYDRO-ALCOOLIQUE (EHA) DES ECORCES DE FAIDHERBIA ALBIDA
Authors: Doupa Dominique
Published: October 2024

Introduction : La présente étude avait pour objectif d’évaluer l’effet sur le glucose sanguin d’un extrait hydro-éthanolique des écorces de F. albida (Fabacées) sur un modèle d’étude du diabète. Matériel et méthodes : La poudre des écorces de Faidherbia albida a été traitée par extraction hydro-éthanolique. L’extrait hydro-alcoolique (EHA) obtenu a été caractérisé au plan phytochimique et testé chez des rats normoglycémiques, sur un test de tolérance au glucose et chez des rats diabétiques de type 2. Résultats : L’EHA renfermant des flavonoïdes, des tanins et dépourvu d’alcaloïdes, est sans effet sur la glycémie de base des rats normoglycémiques (0,88 ± 0,10 vs 0,77 ± 0,15 g/l) et (0,87 ± 0,03 vs 0,74 ± 0,06 g/L) respectivement aux doses de 100mg/kg et 300mg/kg per os. En revanche, il est anti-hyperglycémiant de façon dépendante de la dose sur un test de tolérance au glucose. En effet, aux doses de 100 et 300 mg/kg per os de l’EHA, le pic hyperglycémique après administration de glucose (4 g/kg, per os) était respectivement 1,21 ± 0,05 g/L et 1,04 ± 0,10 g/L vs 2,03 ± 0,28 g/L dans le groupe de contrôle. L’EHA est anti-hyperglycémiant sur un modèle de troubles de la sécrétion d’insuline induit par l’alloxane. En effet, à la dose de 100mg/kg per os, le glucose sanguin, au bout de huit (08) jours d’observation, était de 2,38 ± 0,55 g/L vs 3,82 ± 0,52 dans le groupe témoin (eau physiologique) et 1,91 ± 1,25 celui du groupe traité par le glibenclamide. Conclusion : Les composés des écorces de Faidherbia albida sont exclusivement anti-hyperglycémiants, probablement par un mécanisme mettant en jeu une amélioration de l’action de l’insuline au niveau des tissus périphériques. L’effet anti-hyperglycémiant de l’EHA pourrait être lié à la présence de flavonoïdes dans l’extrait. En perspective, nous envisageons de poursuive le fractionnement de l’extrait alcoolique par chromatographie liquide haute performance afin d’isoler la molécule présentant un intérêt dans le traitement du diabète de type 2
TÉRATOME KYSTIQUE OVARIEN CHEZ UNE ADOLESCENTE À PROPOS D’UN CAS AU SER[1]VICE DE CHIRURGIE GÉNÉRALE DE L’ HOPITAL GÉNÉRAL IDRISSA POUYE DE DAKAR (2020)
Authors: Samba Moussa Marieme
Published: October 2024

Le tératome kystique de l’ovaire est une pathologie fréquente qui peut se voir à tout âge mais surtout pendant l’âge d’activité génitale. C’est la seule forme bénigne des tumeurs germinales, c'est aussi la plus fréquente de toutes les tumeurs germinales. Nous rapportons le cas d’une adolescente de 17 ans qui présentait une masse abdomino pelvienne. La symptomatologie clinique d’une tumeur ovarienne présumée bénigne est non spécifique. Le diagnostic d’un tératome hétérokystique mature a été retenu après exploration chirurgicale et examen anatomopathologique de la pièce d’annexectomie droite. Les suites opératoires ont été simples.
MYELOME MULTIPLE COMPLIQUÉ D’UNE AMYLOSE AL AVEC MANIFESTATIONS SYSTÉMIQUES CHEZ UNE FEMME DE 58 ANS SUIVIE AU SERVICE D’HÉMATOLOGIE CLINIQUE DE DAKAR.
Authors: KEITA Mohamed
Published: October 2024

Les amyloses sont un groupe rare et hétérogène de maladies qui se caractérisent par le dépôt de protéines anormalement repliées dans les tissus. Le diagnostic précoce de l'amylose continue de poser un défi important et nécessite la participation de nombreuses spécialités cliniques et de laboratoire. La détermination du type de protéine est impérative avant qu'un traitement spécifique puisse être mis en place. L’atteinte cardiaque est à l’origine de la plupart des décès. Le myélome multiple est une cause non rare d’amylose AL. Nous rapportons le cas d’une patiente de 58 ans chez qui le diagnostic d’amylose AL a été posé au cours du suivi pour un myélome multiple
MULTITERRITORIALIDADE IMPOSTA POR BELO MONTE AOS REMOVIDOS PARA O RUC SÃO JOAQUIM
Authors: Alves dos Santos Bruno , Queiroz de Miranda Neto José
Published: October 2024

Este artigo investiga o processo de construção de novas territorialidades e as relações de pertencimento entre os sujeitos atingidos pela implantação da Usina Hidrelétrica de Belo Monte, focando especificamente no Reassentamento Urbano Coletivo (RUC) São Joaquim, localizado em Altamira, Pará. O estudo explora a problemática da transformação territorial provocada pela construção da usina, que desencadeou um processo de desterritorialização e subsequente reterritorialização entre os moradores deslocados. O principal objetivo é desvendar como esses moradores, agora realocados no RUC, desenvolvem novas formas de pertencimento e territorialidade, que reconstroem suas vidas em um contexto radicalmente alterado. Utilizando uma abordagem metodológica qualitativa, a pesquisa se apoia em trabalho de campo, entrevistas, dados secundários e fotografias no sentido de entender as vivências e percepções dos residentes do RUC. Os achados do estudo destacam a emergência de novos territórios e práticas espaciais dentro do RUC São Joaquim, ressaltando a existência de uma multiterritorialidade e a interação dinâmica com diversos grupos sociais. A desterritorialização enfrentada pelos moradores teve profundos impactos em suas relações sociais e identidade territorial, ocasionando uma profunda reconfiguração do espaço urbano e da dinâmica comunitária. Enfrentando diversos desafios, os moradores trabalham na reconstrução de relações de vizinhança e na reafirmação de sua territorialidade, num esforço para adaptar-se e encontrar sentido no novo ambiente urbano que agora habitam.
Impacto del uso de las redes sociales en la investigación educativa en estudiantes y académicos de universidad privada en Jalisco derivado del COVID-19
Authors:   Universidad del Valle de Atemajac, González Vázquez Mayra Isabel
Published: October 2024

Este proyecto de investigación busca analizar el impacto que tiene el uso de las redes sociales en la investigación educativa derivado del CO-VID-19, como un proceso de innovación en las instituciones de educación superior. La metodología utilizada es mixta de tipo exploratorio con un método deductivo, aplicando investigación de campo en el área de las ciencias económica administrativas, tanto a estudiantes de universidad privada en Jalisco, México y académicos de la Red Encuentra tu par.org.
Diferencias en el perfil de estudiantes de educación superior presencial y a distancia
Authors:   Universidad del Valle de Atemajac, Roque Rodríguez Ernesto
Published: October 2024

El objetivo de esta investigación fue identificar diferencias en el perfil de los estudiantes de educación superior tradicional o presencial y a distancia. Con la intención de reafirmar perfiles para ser considerados por las Instituciones de Educación Superior, así como para el diseño de programas académicos adecuados y de calidad. A raíz de la aparición de la pandemia del COVID-19 se hizo necesario conocer sobre la forma en que se pudiera mejorar la educación a distancia. Se trata de una investigación estadístico-descriptiva con uso de un método cuantitativo. La unidad de análisis fueron los estudiantes de dos universidades situadas en la Zona Metropolitana de Guadalajara.
THE INFLUENCE OF DIGITAL FINANCIAL LITERACY, PERCEPTION OF BENEFITS, AND INTEREST ON STUDENTS’ HABIT IN CARRYING OUT DIGITAL PAYMENT TRANSACTIONS
Authors: Hidayani
Published: October 2024

This study aims to examine the influence of three exogenous latent variables, namely digital financial literacy, perception of benefits, and interest in one endogenous latent variable, namely student habits in conducting digital payment transactions. the purpose of this study is to determine the influence of digital financial literacy, perceived benefits, and interest in student habits in conducting digital payment transactions with the following hypotheses: H1: Digital financial literacy has a positive effect on students' habits in conducting digital payment transactions.H2: The perception of benefits has a positive effect on students' habits in conducting digital payment transactions. H3: Interest has a positive effect on students' habits in making digital payment transactions.The sample of this study was students of the faculty of economics and business, Mulawarman University with a total of 154 respondents. Data was collected through questionnaires with simple random sampling techniques. The research data were analyzed using SmartPLS 4. The results of this study showed that the perception of benefits and interests had a significant positive effect on student habits, namely P value of 0.000 and 0.044, respectively. Meanwhile, digital financial literacy has a positive insignificant effect on student habits, namely the p value of 0.121.
DEVELOPMENT OF CREATIVE ECONOMY PRODUCTS BAKATAK SYRUP IN BATU JONGJONG TOURISM VILLAGE BAHOROK SUB-DISTRICT, LANGKAT REGENCY
Authors: Rosari Dina , Riady Iwan , Julianto
Published: October 2024

This study aims to explore and analyze the process of developing creative economy products, especially Bakatak Sirup, in Jongjong Stone Tourism Village. The research method used is qualitative with a case study approach. This research involves various parties involved in product development, including Bakatak fruit farmers, local businesses, and other stakeholders. This research focuses on the stages of product development, innovation in formulation and packaging, and the economic and social impact of the product on local communities. In-depth interview methods are used to gain views.  in-depth from business actors, while direct observations were made to contextually understand the production process of Bakatak Syrup. The results of this study are expected to provide a deep understanding of how the development of creative economy products can have a positive impact on the local economy and community involvement in the process. Qualitative analysis will be used to identify success factors, challenges faced, and implications of development of creative economy products in Jongjong Stone Tourism Village. This research is expected to contribute to the theoretical and practical understanding of the development of creative economy products at the local level, especially in the context of tourism villages. The findings of this study can be the basis for product developers, local governments, and related institutions to design policies that support the development of the creative economy in the area.
The History Of Palang Pintu As A Local Cultural Value Became An Icon Of Betawi Traditional Weddings
Authors: Handayani Yeni , Permana Rahayu , Nurbaity
Published: October 2024

This research aims to examine the history and symbolic meaning of the doorstop as a local cultural value which has become an icon in traditional Betawi weddings. The doorstop is an important element in traditional Betawi wedding ceremonies, which have existed since the 19th century and function as a symbol of unity and agreement between two families. Through a historical and qualitative approach, this research found that doorstops not only act as physical barriers, but also have a deep meaning that reflects the values ​​of family, togetherness, and respect for ancestral traditions. This research also shows that although the basic shape of doorstops remains consistent, there are variations in design and decoration that reflect the changing aesthetics and tastes of modern Betawi society. The research results emphasize the importance of preserving local cultural values ​​such as doorstops in facing the flow of globalization and modernization. A deep understanding of the history and meaning of doorstops can increase public appreciation for Betawi cultural values ​​and encourage conservation measures by the government and cultural organizations. Thus, the doorstop is not only a ritual element in a traditional Betawi wedding, but also a cultural symbol that is rich in meaning and important for maintaining the identity and cultural heritage of the Betawi people. This research highlights the need for concerted efforts in preserving and promoting this tradition so that it remains alive and appreciated by future generations.
PENGEMBANGAN MEDIA INTERAKTIF BERBASIS GOOGLE SITE PELAJARAN QUR’AN HADITS KELAS X DI MAN KOTA PALANGKA RAYA
Authors: Sahduari Sahdu , Saidah Futihatu , Azis Abdul
Published: October 2024

Penelitian ini bertujuan untuk mengembangkan media interaktif berbasis Google Site untuk pelajaran Qur'an Hadits di MAN Kota Palangka Raya. Dalam era digital, kebutuhan akan metode pembelajaran yang menarik dan efektif semakin meningkat, terutama dalam pendidikan agama. Media interaktif yang dikembangkan diharapkan dapat meningkatkan minat belajar siswa serta mempermudah pemahaman materi Qur'an Hadits. Proses pengembangan menggunakan model 4-D (Define, Design, Develop, dan Disseminate) untuk memastikan kualitas dan efektivitas media. Pengujian dilakukan dengan melibatkan guru dan siswa untuk mendapatkan umpan balik terkait konten dan penggunaan media. Hasil penelitian menunjukkan bahwa media interaktif ini tidak hanya meningkatkan keterlibatan siswa, tetapi jug a memperbaiki pemahaman mereka terhadap materi Qur'an Hadits. Dengan demikian, media ini dapat dijadikan alternatif dalam pembelajaran yang lebih menarik dan interaktif.
 
Kata Kunci: Media Interaktif, Google Site, Al-Qur'an Hadits, Pembelajaran, Pendidikan Agama
Coordinated Multi-Agencies Patrols and Border Security along the Kenya-Somalia Border in Wajir County
Authors: Benjamin Juma Imai , Oyombra Dr. George
Published: October 2024

Securing their boarders has become a concern for all countries globally. This is because unsecure boarders pose a serious threat both to national and international security of states. For instance, the porous Kenya-Somali boarder continues to pose a serious threat to the security and development of Kenya as a country. This study therefore sought to examine how coordinated multi-agencies patrols affects border security along the Kenya-Somalia border. It adopted a descriptive survey research design that used both quantitative and qualitative approaches. Stratified and simple random and purposive sampling techniques were used to collect data for the study. The tools utilized to get data were, questionnaires and interview schedule. Both qualitative and quantitative data were triangulated to provide robust illustrations of the key findings. Quantitative data was analyzed using descriptive statistics and presented as percentages, pie charts, and bar graphs. Qualitative data on the other hand was analyzed thematically and presented as quoted verbatim. The study found that joint coordinated patrols, joint intelligence gathering, sharing and analysis and sharing of resources among the various multi-agency teams played a crucial role in border security management. The study concluded that, the Kenya Police Service, the Kenya Defense Forces (KDF), and local administrative bodies have made significant stride in enhancing boarder security along Kenya-Somali boarder in Wajir County. The study recommended that, as far as the issue of joint multi-agency patrols are concerned, there is need to increase human resource and provide the necessary gears for effective multi-agency patrols. For further research, the study had restricted itself to the multi-agency’s cooperation and border security along the Kenya-Somalia border in Wajir County. However, a number of similarities in the multi-agencies’ cooperation was noticed, mostly through literatures. It would be prudent, to stretch out this research to other regions, to determine the applicability of these findings for the whole of the country Kenya.
Evaluating the Effects of Centralization and Decentralization on Strategic Implementation at Federal University Wukari
Authors: Sylvester Solomon , Daniel David Adi , Farida Abubakar Mamman
Published: October 2024

This study investigates the effects of centralization and decentralization on strategy implementation in Federal University Wukari, Nigeria. Utilizing a cross-sectional research design, the study explores how governance structures—specifically top-level decision-making, uniform policy enforcement, departmental autonomy, and participatory decision-making—impact the effectiveness of strategic implantation within the university. A sample of 150 administrative staff, faculty heads, and department coordinators was selected using a stratified random sampling technique. Data were collected via structured questionnaires and analyzed using descriptive and inferential statistics, including multiple regression analysis. The results reveal that all four dimensions significantly affect strategy implementation. Top-level decision-making and uniform policy enforcement (centralization aspects) were found to provide consistency and alignment with institutional goals, though they can hinder responsiveness. Departmental autonomy and participatory decision-making (decentralization aspects) foster flexibility and innovation, improving the university's ability to adapt to localized needs. However, decentralized systems also pose risks of inconsistent strategy execution across departments. The study concludes that a hybrid governance model, balancing centralization for uniformity and decentralization for adaptability, is optimal for enhancing strategy implementation. This study is particularly relevant in the context of public higher education institutions in Nigeria, where governance structures must evolve to meet growing academic and administrative demands.
Exploring the Therapeutic Potential of Melia azedarach L. in Traditional Medicine: A Comprehensive Review
Authors: Sehar Misbah , Ali Waqas , Arif Sufyan , Zafar Bismah , e-Nayab Dur- , Afzal Maryam
Published: October 2024

Medicinal plants are integral to traditional medicinal practices globally, renowned for their widespread availability and minimal side effects. Melia azedarach L., commonly known as chinaberry or Persian lilac, has long been esteemed in traditional medicine systems for its diverse therapeutic properties. This review comprehensively explores the pharmacological activities, phytochemical constituents, and traditional applications of Melia azedarach L., shedding light on its potential as a valuable medicinal resource. Pharmacological investigations have unveiled a myriad of bioactivities attributed to various parts of the plant, including leaves, bark, seeds, and roots. These encompass antidiabetic, anticancer, antimicrobial, anti-inflammatory, antipyretic, antihyperlipidemic, and hepatoprotective effects, among others. Phytochemical analyses have identified a plethora of secondary metabolites, such as limonoids, flavonoids, alkaloids, terpenoids, and phenolic compounds, contributing to its pharmacological efficacy. Furthermore, this review delves into the traditional uses of Melia azedarach L. across different cultures, highlighting its historical significance in treating ailments ranging from gastrointestinal disorders to skin diseases. The integration of traditional knowledge with modern scientific evidence underscores the potential of Melia azedarach L. as a promising candidate for drug discovery and development. However, further research is warranted to elucidate its mechanisms of action, optimize dosage regimens, and assess safety profiles for clinical applications. This comprehensive synthesis aims to inspire further exploration and utilization of Melia azedarach L. in contemporary healthcare practices, while fostering interdisciplinary collaborations between traditional healers and modern scientists.