bluuebunny/crossref_metadata_2025 huggingface dataset:
Diseño de una metodología de mantenimiento predictivo para asegurar procesos de producción de la industria 4.0
Authors: Pérez Miguel Ángel Luna , Piña Isaías Badillo , Álvarez Graciela Vázquez
Published: April 2021

La industria 4.0 implica la promesa de una nueva revolución que combina técnicas avanzadas de producción y operaciones con tecnologías inteligentes que se integrarán en las organizaciones, las personas y los activos.De una forma simple, se puede decir que se trata de una industria donde las máquinas de producción están digitalizadas, interconectadas, y manejan e interrelacionan cantidades ingentes de datos (conocidos como Big Data), para aprovechar mejor sus funcionalidades y ser así más efectivas y eficientes.

El mantenimiento industrial ha sufrido una gran evolución en los últimos años. Las nuevas tecnologías permiten a las empresas industriales adelantarse a los problemas y optimizar procesos y rendimientos productivos.El impulso de la cuarta revolución industrial gracias a los avances del Internet de las cosas (IoT), la automatización y la robótica, tecnologías que, junto con los análisis y los sistemas de Big Data, constituyen elementos clave en esta nueva era.

En la industria, existen fábricas inteligentes con mantenimiento automatizado y la eficiencia está mejorando de forma considerable. La idea es llevar “más inteligencia” al área de mantenimiento, basadas en la información que les llega en tiempo real, ayudándose de datos esenciales que antes pasaban desapercibidos o “demoraban” en llegar.Se conoce como mantenimiento predictivo al conjunto de acciones y técnicas aplicadas para detectar los posibles fallos y/o defectos que se puedan generar en las máquinas en las etapas incipientes de su proceso.
Statistical comparison of the internal validity (sensitivity, specificity and safety) of three anthropometric indices used in the diagnosis of pathological nutritional situations overweight and obesity
Authors: Monsreal José Franco– , Ku–Polanco David Gustavo , Serralta–Peraza Lidia Esther del Socorro , Uluac María Selene Sánchez–
Published: April 2021

According to the World Health Organization, obesity is growing at an alarming rate, as it is now estimated that more than 250 million people are obese in the world, or 7% of the adult population. Obesity is defined as a generally chronic multifactorial pathological entity manifested by a condition of excess body fat associated with many chronic–degenerative conditions and disorders, mostly treatable. To compare the internal validity (sensitivity, specificity and safety) of the Body Mass Index versus the internal validity of the Waist/Hip Index versus the internal validity of the Abdominal Circumference as diagnostic methods of overweight and obesity in adults aged 18–64 years of either gender who attended the Integral Hospital "Jose Maria Morelos" in the Mayan municipality of Jose Maria Morelos, Quintana Roo, Mexico, during the period comprised from 1 August 2017 to 31 July 2018. The study design corresponds to that of a descriptive observational epidemiological study without directionality and with prospective temporality. A total of 300 observation units [119 (39.67%) of the male gender and 181 (60.33%) of the female gender] of 18–64 years of age were studied in the period from August 1, 2017 to July 31, 2018. Mantel–Haenszel Ji–Square statistic (x2M–H) was used as hypothesis test or statistical significance test. The software Epi lnfo for Windows, Version 7.1.5.2, was used to obtain the values of the statistic x2M–H and of the probabilities (p). According to Norma Oficial Mexicana NOM–174–SSA1–1998, 171 (57.00%) observation units with overweight and obesity were tagged and 129 (43.00%) observation units without overweight and obesity were tagged. The diagnostic test with the highest sensitivity (82.46%) was the Body Mass Index; the diagnostic test with the greatest specificity (58.14%) was the Waist/Hip Index; and the diagnostic test with the highest safety (70.67%) was also the Body Mass Index.
Aplicación de experiencias innovadoras en el ámbito educativo a través del modelo Flipped Classroom
Authors: Torres Carolina Real
Published: April 2021

La Universidad del siglo XXI requiere un abordaje del proceso de enseñanza-aprendizaje desde nuevas perspectivas que preparen a los futuros profesionales para afrontar los retos que la sociedad actual demanda. En este sentido, planteamos como experiencia educativa novedosa la aplicación del modelo Flipped Classroom a la enseñanza de la cultura clásica, resaltando la importancia de la elaboración de materiales didácticos multimedia interesantes y motivadores para el alumnado, apoyados en el uso de las nuevas tecnologías, con el objetivo de mejorar la praxis docente mediante la organización del trabajo en el aula de forma activa y participativa.
CrApp: aplicación móvil Android para encriptar y desencriptar archivos e información
Authors: Martinez Miguel Fernando
Published: April 2021

La información que almacenamos en los smartphones y tablets es más importante de lo que nos podemos imaginar y si cae en malas manos, puede afectar a nuestra vida social, laboral y familiar. Por eso, es muy importante proteger correctamente nuestros dispositivos móviles para que, en caso de que lo perdamos, nos lo roben o lo tomen “prestado” temporalmente sin nuestro consentimiento, impidamos que puedan acceder a dicha información evitando así problemas de privacidad y seguridad.
An Assessment of Sustainable Economic Growth: The Role of Poverty and Education Revisited
Authors: Ali Hina , Ali Muhammad Zeeshan , Nasir Nazia , Ali Hira
Published: April 2021

This study intended to explore the linkage between education, poverty rates, and economic growth in Pakistan. Data for various variables have been collected from 1973 to 2017.  After establishing the stationary process by utilizing the Augmented Dickey-Fuller Test the research used the (ARDL) Auto-Regressive Distributed Lag methodology to estimate the empirical relationships. This study took GDP as a dependent variable whereas independent variables are literacy, health, inflation, headcount ratio, export. The result concluded that Inflation and poverty are the determinants to hinder economic growth while Health, Exports, and literacy are statically significant and have a positive impact on economic growth. It is suggested that a keen focus should put to enhance the educational and health facilities so that higher growth can be achieved. Anti-poverty policies must be made that make them more productive so this will lead to the growth process.
Cálcio na regulação da adiposidade corporal de adolescentes e adultos: revisão sistemática
Authors: Da Rocha Tatiana Márcia , Buerger Fischer dos Santos Josiane , Rocha Camile Laís , Schuindt da Silva Vladimir
Published: April 2021

Objetivo: Descrever os resultados da influência do cálcio, suplementado ou dietético, derivado ou não de laticínios, na regulação do peso e da gordura corporal em adolescentes (13 a 17 anos de idade) e adultos (18 a 64 anos de idade). Método: Revisão sistemática da literatura realizada pelo método Preferred Reporting Items for Systematic reviews and Meta-Analyses (PRISMA) nas bases de dados LILACS, PubMed, SciELO e Google Scholar, usando os descritores: (“adolescentes” OR “adults”) AND (“calcium” OR “dairy products” OR “calcium supplement” OR “dietary calcium”) AND (“body weight” OR “body composition” OR “overweight” OR “obesity” OR “adiposity”), em outubro de 2019, sem restrições de idioma, data ou status de publicação. O protocolo da revisão foi registrado na plataforma International Prospective Register of Systematic Reviews (PROSPERO) (CRD42020150838). Resultados: Vinte e dois estudos foram selecionados, que atingiram os critérios para inclusão na revisão, publicados entre os anos de 2003 e 2017. A maioria apresentou risco baixo de viés, seguindo os procedimentos da National Heart, Lung, and Blood Institute (NHLBI). Todos os nove estudos transversais e quatro dos 13 longitudinais mostraram resultados sugestivos de relação inversa entre o consumo de cálcio na regulação do peso e algum indicador antropométrico de obesidade e/ou constituinte da composição corporal. Conclusão: O consumo de cálcio pode facilitar a perda significativa de peso/ adiposidade corporal, em adolescentes e adultos. O consumo alimentar suficiente desse micronutriente deve ser encorajado para ajudar a minimizar o impacto do sobrepeso/ obesidade.
Aneurisma del seno de Valsalva roto hacia aurícula derecha en el adulto: a propósito de un caso
Authors: Carrión-Arcela Jean Pierre , Custodio - Sánchez Piero , Rodríguez  Urteaga Zoila , Ríos Vásquez Carlomagno
Published: April 2021

Rupture of a Valsalva aneurysm in the adult is extremely rare and is often complicated by acute heart failure. We present the case of a 39-year-old patient with a non-coronary sinus of Valsalva aneurysm complicated by rupture to the right atrium associated with severe aortic regurgitation and moderate tricuspid regurgitation. The treatment was surgical and was based on the repair with a pericardial patch over the aneurysm, aortic valve replacement, and tricuspid plasty. We emphasize the importance of an early diagnosis and timely surgical treatment due to the high associated mortality.
Síndrome de Bayés, accidente cerebrovascular y demencia
Authors: Iomini Pablo , Martínez-Sellés Manuel , Elosua Roberto , Bayés-de-Luna Antoni , Baranchuk Adrián
Published: April 2021

Bayés’s síndrome is a clinical entity based on the association between advanced interatrial block and the development of supraventricular tachyarrhythmia, being atrial fibrillation (AF), most frequent. This association was discovered by Prof. Antoni Bayés de Luna in the’80s. Further studies by other groups found a strong relationship between Bayés’s syndrome and thromboembolic phenomena, being stroke the most serious. Moreover, patients with this syndrome has an increased incidence of cognitive impairment and dementia. This observation triggered the question about whether the use of an anticoagulation therapy prior to the documentation of AF could prevent A-IAB associated thromboembolic events. There are ongoing studies in different phases of development aiming to compare the efficacy of anticoagulation in patients with A-IAB with no prior documentation of AF. The outcomes of these studies will allow determining the efficacy of this early therapeutic intervention, and help deciding the role of anticoagulation in patients with A-IAB and no demonstrated AF.
ACADEMIC CONTRIBUTIONS IN ENTREPRENEURSHIP TOURISM RESEARCH. A BIBLIOMETRIC ANALYSIS
Authors: Fagadar Carmen Florina , Trip Diana Teodora , Badulescu Daniel
Published: April 2021

Tourism is one of the largest global industries; it generates economic and non-economic benefits for the world's nations, creates opportunities for many related industries, and has a significant contribution to local communities’ prosperity. Despite the extraordinary difficulties posed by the global pandemic crisis, its prospects to remain one of the main providers of jobs, income, and regional or global development are still encouraging. However, tourism is at a crossroads, and the contribution of entrepreneurship can give a new meaning, a new direction to the efforts to recover and resume growth. That is why it is important to understand the nature, scope, challenges, and dimensions of tourism entrepreneurship, the trends that accompanied its evolution in recent decades, and to perceive its future prospects. The emergence of new types and forms of tourism, the expansion of digital technology in most tourism sectors, challenges in existing practices, competition, and the changing models have to be carefully understood and analysed. Tourism and entrepreneurship, two driving forces for economic development, have been under the scrutiny of this study, as we tried to map out the knowledge base yielded between 1994 and 2020 timeframe. Bibliometric methods were employed in the analysis of articles. After analysing the available articles chosen with the criteria set of the study, 322 articles concerning tourism and entrepreneurship were obtained. Based on the citation analysis made with HistCite software, we identified the most influential authors, articles, and journals.
OIL PRICE AND EXCHANGE RATE VOLATILITY IN NIGERIA
Authors: Igbinovia Lawson E. , Ogiemudia Omorose A.
Published: April 2021

This study examined oil price influence on the Nigeria exchange rate volatility spanning the retro of thirty five (35) years. The Simultaneous equation modeling of Granger causality test and Vector Error Correction Model (VECM) techniques were adopted, to analyzed the data stream from 1983 – 2019. A dynamic framework analysis that includes test of unit root, descriptive statistics and co-integration preliminary test were carried out. Specifically, the empirical findings show that the coefficient of oil price and other variables (rate of interest, inflation rate and external reserve) considered has varying degree of significant relationship with volatility of exchange rate in Nigeria both in the succinct and long run during the retro under review. The study concludes that oil price has a long run positive non-significant influence on exchange rate volatility and a short run negative non-significant influence on exchange rate volatility in Nigeria during the sample retro under concern.
Phương pháp kiểm định kỹ thuật trên cơ sở phân tích rủi ro (RBI) cho bình chịu áp lực của các công trình chế biến dầu khí
Authors: Nguyen Thanh Thai  , Nguyen Thanh Hung  , Tran Nguyen Quy
Published: April 2021

Phương pháp kiểm định kỹ thuật trên cơ sở phân tích rủi ro (Risk Based Inspection - RBI) là phương pháp kiểm định dựa trên cơ sở kết quả phân tích, đánh giá mức rủi ro của các thiết bị có thể gây ra, đặc biệt là thiết bị/hệ thống có mức rủi ro cao, giúp tối ưu hóa các nguồn lực trong việc xây dựng kế hoạch kiểm định và bảo dưỡng thiết bị.

Trên cơ sở quy định của pháp luật Việt Nam, các quy định của quốc tế (nền tảng là các tiêu chuẩn API, ASME) và thực tế áp dụng phương pháp RBI tại Việt Nam, Tổng công ty Bảo dưỡng - Sửa chữa Công trình Dầu khí (PVMR) đã nghiên cứu, xây dựng phương pháp RBI áp dụng cho việc kiểm định bình chịu áp lực của các công trình chế biến dầu khí.
Üreme Sağlığında Erkek Kontrasepsiyonu Boyutu
Authors: TANRIVERDİ Fatma Şule , DEMİREZEN Esma
Published: April 2021

Üreme sağlığında erkek kontrasepsiyonunun boyutunu tanımlamak için kapsamlı literatür incelemesi amaçlanmıştır. Literatür çalışması kapsamında; Aralık 2019-Nisan 2020 tarihleri arasında Google Akademik ve Pubmed veri tabanlarında “contraception”, ”male contraception”,”family planning”,” sexual health” AND “reproductive health” OR ”female contraception” ve “kontrasepsiyon”, ”erkek kontrasepsiyonu”, ”aile planlaması”, ”cinsel sağlık” ve “üreme sağlığı” anahtar kelimeleri kullanılarak Türkçe ve İngilizce erişime açık tüm makaleler incelenmiştir. Erkeklerin aile planlaması yöntemlerini bilme durumları yüksek olmakla birlikte kullanma durumlarının düşük olduğu bildirildiği görülmüştür. Aile planlaması yöntemlerini tanıma durumları ise geleneksel yöntemlerde daha yüksek iken modern aile planlaması yöntemlerini bilme daha düşük olarak belirlenmiştir. Mevcut bilgiler ışığında erkeklerin aile planlaması yöntemlerinin kullanımının cinsel sağlık ve üreme sağlığını olumlu yönde etkileyeceği düşünülmektedir.
ANNELİK HÜZNÜNDEN POSTPARTUM DEPRESYON ve PSİKOZA
Authors: YAVUZ Meryem Yaren , BİLGE Çiğdem
Published: April 2021

Gebelikte ve postpartum dönemde kadınlar fiziksel ve duygusal birçok değişim yaşamaktadırlar. Bu değişimler sonucu duygudurum bozukluklarına yatkın hale gelebilen kadınlar; hafif ve sınırlayıcı belirtileri olan annelik hüznünden, belirtilerin ve şiddetin giderek arttığı, son derece yaygın olan depresyona veya psikotik epizodlarla karakterize psikoza yatkın hale gelebilmektedirler. Son derece yaygın görülen bu ruhsal sorunlar doğum sonrası dönemin önemli komplikasyonlarındandır. Postpartum dönemde yaşanan ruhsal sorunlar anne sağlığı başta olmak üzere, anne-bebek bağlanmasını, sağlıklı birey yetişmesini, aile içi rolleri ve toplumu etkilemektedir. Kadınlar bu dönemin mutluluk verici olduğuna inandığı için yaşadıklarını kabullenemeyip hislerini gizli tutmaya çalışabilirler. Bu da postpartum ruhsal sorunlar tablosunun gizlenmesine neden olabilmektedir.

Bu derlemenin amacı; postpartum dönemde görülen annelik hüznü, postpartum depresyon ve postpartum psikozu tanımlamak ve bu konuda sağlık profesyonellerinin bilgi düzeyini artırarak, bu konuda yapılacak çalışmalara basamak olmaktır.
Pengaruh Senam Stroke Terhadap Kualitas Tidur Pada Penderita Hipertensi
Authors: Suryandari Dewi , Kartina Irna
Published: April 2021

Abstrak. Stroke adalah cedera vaskuler pada otak atau adanya suatu cedera yang berat serta mendadak. Pencegahan adanya komplikasi lanjutan dari hipertensi yang mengarah pada stroke perlu dilakukan. Kesembuhan dan pencegahan pada pasien stroke dapat dilakukan melalui obat-obatan selama rumah sakit dan ditunjang dengan rehabilitasi atau latihan fisik. Salah satu latihan fisik adalah dengan melakukan senam. Senam stroke merupakan salah satu bentuk latihan fisioterapi yang disusun sedemikian rupa untuk dapat memberikan rangsangan kepada beberapa reseptor yang akan dibawa ke otak untuk diproses dan menghasilkan output berupa gerakan yang terkoordinasi. Metode penelitian ini adalah kuantitatif dengan Pre and   Post   Test  Nonequivalent   Control   Group dengan sampel sebanyak 30 responden. Kualitas tidur telah diukur dengan PSQI. Hasil mean skor kualitas tidur pada kelompok intervensi sebesar 5.00 dan pada kelompok kontrol 8.71 dengan standar deviasi sebesar 1.309 pada kelompok intervensi dan 2.199 pada kelompok kontrol. Kesimpulan dari penelitian ini adalah senam stroke memiliki pengaruh yang signifikan  p value < 0.00. terhadap kualitas tidur pada pasien dengan hipertensi.

 Kata kunci: senam stoke, hipertensi, kualitas tidur

 

The Effect of Stroke gymnastics toward Quality of Sleep in Patients with Hypertension

 Abstract. Stroke is a vascular injury that can happen in the brain suddenly or immediately after ther accumulation of tension or obstruction, it is also incleded as severe injury. One condition can lead stroke attack is hypertension, regarding this complication, prevention of further  complication needs to be prepared. Healing and prevention in stroke patients can be done through drugs during the hospital and supported by rehabilitation or physical exercise. One of physical exercises  is to do gymnastics. Stroke gyme is a kind of  physiotherapy exercises that arranged in such a way as to be able to provide stimulation to several receptors that will be brought to the brain to be processed and produce output in the form of coordinated movements. This research method was quantitative with Pre and Post-Test Nonequivalent Control Group with sample 30 respondents, quality of sleep was measured by PSQI,  Results showed that mean of PSQI score in the intervention group was 5.00 and in the control group 8.71 with a standard deviation of 1.309 in the intervention group and 2,199 in the control group. Conclusion of this study is  Stroke gymnastics significantly(p value <0.00) effected the quality of sleep in patients with hypertension .

 Keywords: stroke exercise, hypertension, sleep quality
Tectonics Characteristics of Big Data: 29 V’s and 2C’s
Authors: Poonam Mrs , Marken Mr Gagan
Published: April 2021

In today's era, We have a lot of data, it becomes Big data and this new term is buzzword for us. The data of different kinds either heterogeneous or homogeneous comes from various sources. This unpredictable data is very tough to handle, organise, manage, store and analysis. In 2020,greater than 50 billions devices are connected to internet. In coming years, more than 80 billions devices will be connected to internet and flow of data will be 50 times greater than today. Due to the large number of devices ,volume of data and velocity of data is increasing in uncontrolled manner. This brisk generation of boundless data creates plentiful threats and challenges. There exist a number of methods that are remitting issues and challenges of this zotanic. Data with the theory of Vs like 3 V's, 5 V's, 7 V's ,10 V’ setc. The theory of Vs are changing rapidly. With the theory of Vs ,theory of C’s are also generating. The objective of this paper is to scrutinize and interrogate the status of the today Big/zotanic Data domain. In this paper, we tried to catholic overview of Big Data and theory of V’s and C’s. We explored and described 29 V’s and 1C’s ,represented tectonic characteristics of Big data. The causatum of this research will help others to understand Big Data in an efficient way.
Recursos tecnológicos para la integración de la gamificación en el aula
Authors: Trejo González Hugo
Published: April 2021

El objetivo principal de este artículo consiste en esclarecer la disposición actual de herramientas tecnológicas aplicables a la perspectiva didáctica de gamificación. Para ello, hemos indagado en un motor de búsqueda de uso común en internet con la finalidad de obtener información sobre recursos tecnológicos para construir un referente que permita identificar las funciones generales, los objetivos y el impacto en las mecánicas, en las dinámicas y en los componentes de la perspectiva educativa aludida. Los resultados han permitido obtener información sobre 23 recursos tecnológicos relacionados con el ámbito de estudio. Además, con los resultados hemos analizado tres herramientas con el objetivo de contribuir a la comprensión de sus funciones para ayudar en su posible adaptación a los ambientes de aprendizaje lúdicos.
SOLUTION OF THE PROBLEM OF FUEL COMBINATION IN MAINTENANCE
Authors:   Tashkent State Technical University, Tulaev B , Viarshyna H , Mirzaabdullaev J , Khakimov J
Published: April 2021

In article, the solution of problem of the combined use of fuel in operation is considered. It is shown that during the operation of the gasoline automobile engine the requirement to octane number of fuel changes depending on engine operation mode: at increase in rotary speed the required octane number of fuel decreases, and at increase in loading increase in octane number of fuel is necessary. The combined use of low-bracket gasoline with high-octane liquefied gas is given. The condition supporting necessary octane number of fuel on various modes for ensuring without detonation work and optimization of combustion procedure is defined. At all engine operating modes in operation on combined fuel, only a high-octane component should be supplied. To control the change in the ratio of the supplied components of the combined power system, it is necessary and sufficient to use any combination of the following parameters: – vacuum in the intake manifold; – is the engine speed; – is the degree of opening of the throttle valve of the carburetor, or others, which are functionally dependent on the above. As a result, the feasibility of choosing one or another option is determined by the design features of the fuel combination implementation system
DIAGNOSTIC AN GNOSTIC ANALYSIS OF RANDOM VIBRA SIS OF RANDOM VIBRATION RESUL TION RESULTS IN THE AVIATION GAS TURBINE ENGINES PULSE-WIDTH AUTOMATIC CON TIC CONTROL SY TROL SYSTEMS BASED ON D STEMS BASED ON DYNAMIC GRAPHS AMIC GRAPHS
Authors: Tuganov G , Rakhimov C , Norkulov E
Published: April 2021

Studies are often conducted to minimize the effect of vibration on equipment and its mechanisms. Since the engine is the main driving force of all technical objects, vibration is one of the factors hindering its operation. With this in mind, this article investigated the random probability distribution of vibration parameters using the laws of mathematical statistical distribution and was found to be compatible with the normal distribution law. At the same time, this study demonstrates that the proposed method of technical diagnostics can be used to assess helicopter engine failures.
ANALYSIS OF TECHNOL SIS OF TECHNOLOGICAL POSSIBILI OGICAL POSSIBILITIES OF FERRIC TIES OF FERRIC RECOVERY BY NON-CONVEN Y NON-CONVENTIONAL REDUCING A AL REDUCING AGENTS
Authors: Khayrullaev P , Farmanov U
Published: April 2021

The article discusses the results of the analysis of the technological possibilities of iron recovery of iron-containing concentrate by non-traditional restorers. The restoration of iron from its oxide compounds by direct gas recovery of iron-containing pellets with carbon monoxide is presented. The direct use of the secondary carbon monoxide available in the republic is shown in comparison with the application of complex process processes of carbon monoxide processing and production of intermediate products. It has been established that in order to fully recover iron oxides in the source raw material mass the technological cycle should be repeated several times. As a result, alloys of iron with other metals in iron ore concentrate are formed, as hydrogen is the ideal regenerator.
DETERMINATION OF PROBABILITY - TEMPORARY CHARACTERISTICS OF COMMUNICATION CHANNELS WHEN TRANSMITTING PRIORITY AND NON-PRIORITY DATA.
Authors:   Tashkent State Technical University, Karimov Sh
Published: April 2021

The article discusses the issues of finding the main indicators of the quality of the communication channel in computer networks when transmitting priority and non-priority data at different frame lengths. To solve this problem, methods of the theory of queuing using Petri nets are proposed. The proposed method for calculating the temporal and probabilistic characteristics of computer networks allows determinining the main indicators of the quality of the channel in a stationary mode when transmitting priority and non-priority data of computing tools at various values of the input stream intensity. To simulate the transmission of priority and non-priority frames, a color temporary Petri net is proposed. An algorithm is proposed for determining the basic parameters of information transfer, based on the use of the Little formula and allowing one to determine the number of frames in a queue, the average time a frame has been in a queue, and other distinctive features of the algorithm include the use of the window mode. The proposed technique allows to reduce the loss of priority frames of trajectory information and ensuring their transmission in real time.
CERTIFICATION OF VEGETABLE OILS AND QUALITY CONTROL IN THE TECHNOLOGICAL PROCESS OF PRODUCTION
Authors:   Tashkent State Technical University, Bekmurotov CH
Published: April 2021

The article reviewed the certification and quality control of the technological process for the production of vegetable oil. There is a procedure for packaging, quality control of products, determination of quality indicators and quality control of finished products. The procedure for using refined cottonseed oil and its varieties, the requirements for placement and storage of vegetable oils, as specified in the regulatory documents, the quality control of vegetable oils and other solutions for cottonseed oil are provided. The gas analyzer shows a solution for measuring the amount of solution by painting the tubes of a mixture of gas and air in oil. Detailed information on the production of vegetable oils, the cost of raw materials, the level of fat content of cotton seeds and the methods used to produce oil from cotton seeds. Methods for certification of vegetable oils, types of quality control, methods of testing and quality determination are presented. It was shown that the procedure for refined production of cottonseed oils and their types, as well as the state of the product classification of products based on the method of producing vegetable oils for consumer purposes, analysis of the sequence of refined oils and refining processes.
DEVELOPMENT OF CORRELATION AND REGRESSION MODELS OF ELECTRIC ENERGY INDICATORS OF THE EQUIPMENT WITH CONTINUOUS NATURE OF PRODUCTION
Authors:   Tashkent State Technical University, Rakhmonov I , Niyozov N , Li K
Published: April 2021

The article presents an analysis of the use of correlation-regression analysis, which is based on the methods of mathematical statistics and probability theory in the study of the power consumption of enterprises with equipment of continuous production. On the basis of the annual power consumption schedule of the electric steel-smelting shop in a monthly time section, mathematical models have been developed for the power consumption parameters. And also, on the basis of statistical data with the use of a mathematical method, mathematical expressions were obtained for the electric power consumption and the specific consumption for the main equipment of the electric steel-smelting shop. In order to assess the adequacy of the developed mathematical models, mathematical models of the total and specific consumption of their power consumption are compared with actual data. The comparison results show high reliability of the power consumption modes of the main equipment of the facility in question. The analysis of the values of forecast errors with low error rates determines the adequacy of the developed mathematical models of the parameters of power consumption in terms of power consumption and specific consumption for the main equipment of the electric steel-smelting shop. In this regard, they can be used to determine the predicted values of the parameters of power consumption in electric steelmaking equipment.
THE CORROSION STABILITY INCREASE OF ADHERING COATING UNDER THE PROCESS OF ELECTROCHEMICAL MECHANISM
Authors:   Tashkent State Technical University, Turabdzhanov S , Lee M , Ziyamukhamedova U , Miradullaeva G
Published: April 2021

The article discusses the development of organomineral materials for the protection of metal parts of technological machines and structures operating mainly under the influence of an electrochemical environment. A technology has been developed for producing modified organomineral materials for anticorrosive coatings using micro- and nanosized particles of layered silicates (mineral fillers). The mechanism of the formation of nanocomposites using layered silicates and organic materials for anti-corrosion coatings formed by the activation-heliotechnological method is investigated. Using thermomechanical, physical and physico-chemical methods for studying the structure and properties of the materials obtained. Among these methods are: IR spectral analysis, scanning electron microscopy, thermogravimetry, as well as methods for determining the electrophysical and mechanical properties. And the improvement of the properties of organomineral protective coatings due to the formation of nanocomplex compounds in the interfacial layers of the binder-filler is proved
MODERN MODEL FOR ASSESSING THE EFFICIENCY OF INVESTMENTS ATTRACTED IN RAILWAY TRANSPORT
Authors:   Tashkent State Technical University, Saitkamolov M , Gaibnazarova Z , Cowie J
Published: April 2021

The article analyzes the modern model for evaluating the improvement of investment activity efficiency and provides conclusions on the level of development of the current state of railway transport in the Republic of Uzbekistan. The economic effect of intensive investments is the equivalent of the costs and benefits of the difference between the result and the costs of achieving it. The economic efficiency of intensive investments is defined as the ratio of investment costs to achieving a profitable result (economic effect). The indicators characterizing the economic efficiency of intensive investments: the integrated effect, the need for additional financing, the internal rate of return, the intensive return on investment ratio, the intensive return on investment index, the innovation ratio, investment in human resources, and the effectiveness of modern corporate governance. will be included. The multiplier effect in which a set of multipliers reflects changes in production volumes, investments and industry characteristics. Analysis of specific activities shows the impact of growth indicators, given its contribution to the dynamics of the economy. An increase in investment costs will lead to an increase in production and income. This interaction is explained by the multiplier effect. The concept of the multiplier means "multiplier". The essence of the multiplier effect is that an increase in investment will lead to greater growth in national income.
PROSPECTS FOR THE DEVELOPMENT OF PRODUCTION OF REAGENTS FOR DRILLING SOLUTIONS BASED ON SECONDARY RESOURCES
Authors:   Tashkent State Technical University, Gaibnazarov S
Published: April 2021

The article discusses the prospects for the development of production of reagents for drilling fluids based on secondary resources. Currently, the big problem is the creation of new, highly efficient and affordable drilling fluids and they are essential for successful drilling, to increase productivity and reduce the amount of time. To solve these problems, the article considers the possibilities of synthesis and practical application of new stabilizers for drilling fluids based on waste from chemical enterprises of our republic. The basic physicochemical, rheological and applied properties of the developed stabilizer-reagents are investigated. Specific areas of practical application of the developed new stabilizers are given.
INVESTIGATION OF MORPHOLOGICAL COMPOSITION AND EVALUATION OF THE EFFECTIVENESS OF MUNICIPAL SOLID WASTE RECYCLING METHODS IN UZBEKISTAN
Authors:   Tashkent State Technical University, Rakhmatullayev F , Turabjanov S , Ponamaryova T , Rakhimova L , Abdullaev U
Published: April 2021

This article deals with the problem of Municipal solid waste (MSW) in the Republic of Uzbekistan. In the process of research, the methods for the disposal of MSW that are still used in the country, such as incineration and disposal at landfills, were examined. For the necessity to implement innovations in the work of handling MSW, the basic morphological composition of MSW in the winter, spring, summer and autumn seasonal periods was researched. Based on the results obtained, an innovative direction is proposed for the processing of MSW into secondary raw materials in order to solve the problems of resource savings and jointly with the solution of environmental and economic problems of the republic. To solve the problem of waste management, an innovative technology has been proposed for the transition from landfills to waste recycling plants.
INVESTIGATION OF AN ELECTROMAGNETIC TWO-STROKE VIBRATING ACTIVATOR IN OSCILLATORY MODE
Authors:   Tashkent State Technical University, Rakhmatullayev A , Abidov K
Published: April 2021

The article considers the results of the study of electromagnetic vibration exciter with sequentially included capacitor in the electrical circuit, consisting of mechanical and electrical subsystems. It is shown that by means of the Lagrangian-Maxwell equation the interconnection between mechanical and electric subsystems can be realized. The relations describing processes of establishment of amplitudes and phases of oscillations both in mechanical and in electric subsystems are deduced. The equations connecting the output (amplitude) of vibration of the vibrating exciter with its input (voltage) of the network are presented. As a result, the formulas allowing making corrections at the solution of the system describing operation of the electromagnetic vibrating exciter in two-stroke mode are presented.
RESEARCH OF FEATURES AND COMPOSITIONS OF VERMICULITE FOR USE AS SUSPENSION FIRE RETARDANT FOR TEXTILE MATERIALS
Authors:   Tashkent State Technical University, Khaidarov I , Ismailov R
Published: April 2021

This article presents studies of fire resistance in the treatment of expanded vermiculite, which depends on the size of the dispersed particles and the orientation of the granules, their moisture and temperature. It has been studied that one of the interesting and important in practice properties of vermiculite is its ability to swell and turn into a lightweight effective material for imparting fire resistance. The properties and compositions of vermiculite from the Tebinbulak deposit are studied, from which a flame-retardant suspension is prepared for processing textile materials based on vermiculite dissolved in orthophosphoric acid and alkali in an aqueous medium. When modifying materials with developed flame-retardant suspensions, it is possible to obtain fire-resistant textile materials that meet the requirements of GOST for fire resistance, smoke generation and other physical and mechanical properties.
QUANTITATIVE ANALYSIS OF THE RELATIONSHIP BETWEEN THE SIZE AND LOCATION OF OIL AND GAS FIELDS WITH GRAVITATIONAL ANOMALIES OF THE FERGANA DEPRESSION
Authors:   Tashkent State Technical University, Umurzakov R , Rabbimkulov S
Published: April 2021

Based on the analysis of published materials, it is noted that the degree of connection between the indicators of the anomalies of the gravitational field and oil and gas content remains unclear. The aim of the research was to study the nature of the dependence and assess the degree of connection between the size and location of oil and gas fields with gravitational anomalies using the example of the Fergana oil and gas region. To solve this problem, the published material on the geological structure and data on the sizes (effective volume) of deposits, as well as data on deep anomalies of the gravity field in the Fai reduction, were used. The study involved about 70 deposits. Analysis of variance showed that the “influence” of the deep anomaly factor on the effective volume of the fields in the Fergana depression is significant and reliable with a probability of 0.99. At the same time, the share of the influence of this factor on the effective volume of oil deposits in relation to the total impact of all factors is 42%, and for oil and gas - 62%. This testifies to the significant influence of deep subcrustal processes that create corresponding gravitational effects on the formation of the size and location of oil and gas fields in the Fergana depression. According to local gravity anomalies, the impact on the location and effective volumes of deposits is significant, but the reliability is low. The degree of influence on them remains unclear. The results obtained can be used to develop methods for forecasting promising areas for performing high-priority geological exploration works.
NON-CON NON-CONTACT POINT MEASURING EQUIPMEN T MEASURING EQUIPMENT FOR ROBO T FOR ROBOTIC SYSTEMS OF AUTOMOBILE INDUSTRY
Authors:   Tashkent State Technical University, Khollhujayev J , Abdukarimov N , Mavlonov J , Abdivahidova N
Published: April 2021

The non-contact measurement method development is caused by the need for precise measurement and elimination of an operator’s errors. The purpose of the atticle research is to develop a reliable small scale prototype model of non-contact point measuring system. The mathematical model of robotic articulated arm has been developed to analyze the forward kinematics. Then, the prototype model of a robotic arm and laser-sensor mounted technique have been developed to take the measurements. The idea was derived from the coordinate measuring machine working principle, that puts the tip or tool center point in the known position with necessary precision. Most of the production engineers rely on the measurement data obtained from the CMMs. Most of the CMMs used in Uzbekistan are mainly contact based CMMs that have a number of disadvantages, i.e. a liitle inspection time. Also, the ergonomics and redundancy of the CMMs body frame are not acceptable. The surfaces of a vehicle body frame are designed in the free forms to give better aerodynamics and smaller resistance coefficients that result in difficult shapes that is not possible to reach easily with the ordinary CMM. The scientifically-developed robotic arm based on the non-contact CMM helps to cope with this issues
DECOMPOSITION METHOD FOR MODELING AND RESEARCH OF PULSE-FREQUENCY CONTROL SYSTEMS
Authors:   Tashkent State Technical University, Kadirov A
Published: April 2021

The pulse-frequency control systems are widely used in radar, space industry, for control of technological processes and robots and many other areas. Today, there are various approximate and accurate methods for the analysis and synthesis of pulse-frequency systems (PFS). However, the area of the practical application of the existed methods is mainly limited to single-variable systems. The classical methods provide the consideration of the initial structures of pulse-frequency systems as a whole. This article proposes the decomposition method for modeling and research pulse-frequency automatic control systems. The method is based on the mathematical apparatus of signal-flow graphs. We can use the method for analysis and synthesis of both single-variable and multivariable automatic control systems with pulse-frequency modulation
METHODS AND TOOLS OF CEMENT PRODUCTION PROCESS (COMPARATIVE ANALYSIS), POTENTIAL OF UZBEKISTAN IN THIS AREA
Authors:   Tashkent State Technical University, Umid Khudaykulov , Turgunbayev S
Published: April 2021

the article describes the history of cement use, its initial appearance, cement composition and its physicochemical structure and properties, types of cement and classifications of cement. Cement production processes, technological methods used in production, advantages and disadvantages of the methods and technological stages of the production process by the drying method of cement production are covered. A study of the cement industry and processes in the country was conducted, which summarized the most priority methods and processes of cement production based on the natural resources, climate and potential of Uzbekistan.
Determination and assessment of phosphorus assimilation capacity applying Vollenweider approach for Hazar Lake
Authors: AYAZ Selma , DİLAVER Mehmet
Published: April 2021

Eutrophication is a natural process for natural lakes and dams and the hydraulic retention time of this process is directly related to whether the assimilation capacity is exceeded depending on the current water quality and pressures consists of point and diffuse sources. Exceeding assimilation capacity is accepted good for biological productivity however this situation cannot be desired for water resources any time and preventive actions need to be taken to sustain good water quality. The Vollenweider OECD Method is a widely used and accepted approach in order to calculate current phosphorus loads for phosphorus limiting lakes and dams. In addition to OECD method, rational method is used frequently in calculating the flowrates via surface run-off after precipitation. In this study, the calculation of the assimilation capacity for phosphorus limiting lakes and dams using the Vollenweider Method and rational method for calculation of flowrates were applied for Hazar Lake’s Basin example. When the apply proposed approach Hazar Lake’s TP loading might be increased 3.7 times a year for desired oligotrophic upper boundary condition and 13.7 times a year for mesotrophic state boundary condition.
The association between low bone mineral density and coronary artery calcification in osteoporotic and non-osteoporotic patients in a tertiary center in Saudi Arabia
Authors: Fathala Ahmed L. , Alkulaybi Sami , Khawaji Abdulrahman , Alomari Abdelghafour , Almuhaideb Ahmed
Published: April 2021

BACKGROUND:

Cardiovascular disease (CVD) and osteoporosis are major health-care concerns worldwide. The evidence is contradictory on whether a relationship exists between low bone mineral density (BMD) determined by dual-energy absorptiometry (DXA scan) and coronary artery calcification (CAC) measured by computed tomography. Currently, there are no data on patients from Saudi Arabia.

OBJECTIVE:

Examine the relationship between CAC and BMD in both genders and study the influence of traditional coronary artery disease (CAD) risk factors and osteoporosis.

DESIGN:

Retrospective, cross-sectional, analytical.

SETTING:

Single tertiary care center.

PATIENTS AND METHODS:

We searched radiology databases for patients who underwent both DXA and CAC score scanning within six months of each other. The inclusion criterion was an absence of any history of CAD.

MAIN OUTCOME MEASURE:

Association between osteoporosis and CAC.

SAMPLE SIZE:

195 (34 osteoporosic, 161 normal BMD or osteopenic)

RESULTS:

Most of the study population (57.4%) were females. The mean age of all patients was 63.6 (10.1) years. Participants with CAC scores of 0 were significantly younger than those who had CAC scores >0. The presence of diabetes mellitus, hypertension, and hypercholesterolemia was higher in patients with CAC scores >0. CAC score and other CAD risk factors were not significantly different between the osteoporotic and nonosteoporotic groups, except for body mass index. A high CAC score (>100) was present in 28%, 20%, 11%, and 30% of participants with no osteoporosis, osteoporosis of the lumbar spine, osteoporosis of the femoral neck, and participants with osteoporosis of both the lumbar spine and femoral neck, respectively (
P
=.762), suggesting there is no association between CAC and the presence of osteoporosis.

CONCLUSIONS:

Osteoporosis is not associated with higher CAC scores in Saudi Arabia and CAD risk factors are not significantly prevalent in osteoporosis. It appears that CAC and osteoporosis are independent age-related diseases that share common risk factors.

LIMITATIONS:

Single-center, retrospective.

CONFLICT OF INTEREST:

None.
Clinical manifestations and treatment outcomes of human brucellosis at a tertiary care center in Saudi Arabia
Authors: Edathodu Jameela , Alamri Maha , Alshangiti Khadijah Ahmed , Alfagyh Noura S. , Alnaghmush Ahmed S. , Albaiz Faisal , Alothman Bader , Khalil Hala , Edathodu Zenusha , Alrajhi Abdulrahman A.
Published: April 2021

BACKGROUND:

Brucellosis, which has profound public health and economic consequences, is endemic to Saudi Arabia.Brucellais transmitted to humans by direct contact with infected animals or by consumption of unpasteurized dairy products. Manifestations of brucellosis are protean and require a combination of drugs to prevent the emergence of resistance. The WHO recommends the use of doxycycline with rifampicin or an aminoglycoside for brucellosis, but experts in Saudi Arabia prefer to avoid the use of rifampicin and aminoglycosides to lessen the possibility of emergence of drug-resistant tuberculosis.

OBJECTIVES:

Compare rifampicin and doxycycline in the treatment of human brucellosis versus various combinations of doxycycline, with either trimethoprim-sulfamethoxazole (co-trimoxazole), quinolones or aminoglycosides, and describe the clinical manifestations of brucellosis.

DESIGN:

Retrospective medical record review.

SETTING:

Single tertiary care center.

PATIENTS AND METHODS:

Diagnosis of brucellosis was based on positive serology by standard agglutination test (SAT), or isolation by culture ofBrucellaspecies from blood, body fluid or tissue.

MAIN OUTCOME MEASURES:

Cure rate with the use of doxycycline in combination with either co-trimoxazole, quinolone or aminoglyco-sides in comparison to doxycycline/rifampicin and the clinical features of brucellosis.

SAMPLE SIZE:

123.

RESULTS:

In 118 (96%) patients, the median IgG/IgM antibody titers at diagnosis and at 6 and 12 months were 1:1280/1:1280, 1:640/1:640, and 1:320/1:160, respectively. There were no differences in outcome between treatment regimens, as evidenced by a significant decrease in SAT titers and symptom resolution within six months. Five (4%) patients relapsed from non-adherence to treatment, but responded well to a second course of treatment. Blood cultures were positive in 50 patients (41%) patients. Fever, arthralgia and back pain were the most common symptoms. Good serological and clinical responses were achieved in 96% of patients. Relapse in 4% (n=5) was due to self-reported non-adherence.

LIMITATIONS:

Retrospective, relatively small sample size.

CONCLUSIONS:

Doxycycline with co-trimoxazole is as efficacious as doxycycline/rifampicin in non-focal brucellosis and is preferred in countries with a high prevalence of tuberculosis.

CONFLICT OF INTEREST:

None.