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Treating Scale Deposits in Pipes Using Ultrasonic
Full text linkOne of the most important technical and economic problems is the calcification of scales on the surface of the transport pipes and heat exchanger due to the flow of tough water. Combining ultrasound with other techniques leads to highly efficient results in treating calcification. This study combines two techniques to treat calcification: the first is physical, represented by ultrasound using an ultrasonic device with a frequency of 25 kHz, and the second is chemical, represented by adding weak acids (citric acid, salicylic acid, and ethylenediaminetetraacetic acid). We immersed the samples in the system tank containing hard water for three months, until a layer of calcifications formed on the surface. Afterwards, we treated the samples using ultrasound technology, applying concentrations of (1%, 2%, 3%, 4%, 5%, 6%) of the used acids at a temperature of 40 °C. That using ultrasonic technology in conjunction with weak acids leads to positive results in removing limescale deposits in transport pipes. Specifically, citric acid proved to be the most effective in removing limescale deposits, as it showed a long period of effectiveness. The best concentration of citric acid was applied to a sample of heat exchanger pipes that had previously been exposed to limescale deposits, which prevents the metal from corrosion
The Model For Testing Capital Asset Pricing: A Case Study Of Uzbek Companies
Full text linkThe article discusses the scientific and theoretical aspects of using the capital asset pricing model (CAPM) to calculate the value of capital assets in joint-stock companies. It specifically focuses on using CAPM to determine the discount rate for the cash flow of a joint-stock company, based on the income approach of capital assessment. The discounted free cash flows and private equity value of "Kvarts" JSC from 2019 to 2023 were also calculated. Furthermore, the study emphasizes the influence of discounted free cash flows on the future net profit and profitability of the joint-stock business. Simultaneously, experts have formulated scientific and practical guidelines for employing the capital assets approach to assess the capital of joint-stock companies
Long-Term Loans: Problems and Solutions
No full textToday, the world is developing rapidly; new techniques and innovative technologies are being created. In turn, in order to implement these innovations and produce competitive products or services in accordance with modern requirements, as well as to further expand the scope of activities, businesses naturally need high bank loans and choose the financial institution that is most able to meet these needs. This article examines and analyzes in detail the problems associated with long-term loans provided by commercial banks. The authors have developed their own approach to this problem on the basis of the literary sources of foreign and domestic scholars. In addition, the article presents relevant proposals and recommendations
The Importance of Investments in The Training of Qualified Personnel in the Field of Tourism
No full textThe article describes one of the components of the human factor development of employees of tourism enterprises of the Republic, working in a condition the market economy, labor potential, its indicators
Problems of Concentration of Venture Capital Investments
No full textThis article examines the problems associated with the concentration of venture capital investment, focusing on the restrictions on new and small start-ups caused by the dominance of large investors and funds. The issue of one-sided development of industries and geographical uneven distribution of investments is highlighted, which leads to economic imbalances and increased regional differences. Also in the final part of the article, suggestions will be given to reduce the negative consequences of concentration
Problems of Attracting Investments and Financing in the Service Field
No full textAttracting investments in various fields in the development of the country creates the basis for the prosperity of the economy of this country. However, just like there are two sides to a coin, there are some challenges in attracting investment. This article describes in detail the problems of attracting investments in the service sector
RISK REDUCTION METHODS IN FOREX
No full textForex (Foreign Exchange) is a financial market of currency exchange. In this market, one currency is exchanged against another currency. The Forex market comes first among banks, corporations, individuals and companies who wish to trade foreign exchange
EPIDEMIOLOGICAL FEATURES AND APPLICATION OF TYPHOID VACCINE
No full textTyphoid fever is still widespread and dangerous in low- and middle-income countries. Antibiotics are commonly used for treatment, but endemic countries have experienced problems with drug-resistant strains, making treatment time-consuming and expensive. Salmonella enterica, the causative agent of typhoid fever (S. typhi), remains a problem in many low- and middle-income countries. In industrialized countries, improved sanitation and food hygiene has been an effective means of fighting diseases. However, in most of the affected regions, this progress has been limited by slow socio-economic progress. As a result, vaccination is an effective means of preventing the disease in both the short and medium term. The oral typhoid vaccine and the Vi polysaccharide typhoid vaccine have been available for a long time, but most of the population, especially infants and children under the age of two, are still at risk. Efforts to prevent typhoid fever have recently increased thanks to conjugated vaccines based on Vi polysaccharides and funding to support vaccination by the Gavi Alliance. The supply of the vaccine will be crucial, and numerous efforts are being made to provide new typhoid vaccines to populations in dire need. This review provides an overview of licensed typhoid vaccines, as well as potential vaccines that are currently under development, as well as prospects for their implementation
THE IMPORTANCE OF VACCINATION IN ACHIEVING A POSITIVE TREND IN THE PREVENTION AND TREATMENT OF PARATYPHS IN THE PRACTICE OF INFECTIOUS DISEASES
No full textAlthough measures for the treatment of typhoid and paratyphoid, which are considered important and relevant in medical practice today, have been improved, the main measure to combat the disease is vaccination. This presented article provides an analysis of the importance, importance and relevance of the vaccine specifically in the prevention of typhoid and paratyphoid. And the main purpose of this presented work is to outline the importance of vaccination and a brief analysis of modern approaches to the prevention of typhoid and paratyphoid. To date, a number of research projects are underway to introduce various generations of vaccines into practice. However, no matter how high the activity of the vaccine is, it requires sufficient knowledge of the specifics of indications for use, contraindications to use and side effects. Thus, over the past hundred years, preventive vaccination has significantly reduced the incidence and mortality from infectious diseases worldwide. This process is regulated by the national schedule of routine vaccination in all countries. All children should be able to reach their full potential in health and well-being, and no child should die from preventable causes
TECHNOLOGIES OF PROFESSIONAL COMMUNICATION IN PEDIATRICS
No full textThe foundations of successful professional interaction between a doctor and a patient are inextricably linked with his communicative competence, which is built on the acquired knowledge of communication and interaction with patients or their relatives. Developing communication skills among medical students is one of the key needs of medical education. From these positions, the formation of communication skills should be built continuously and consistently from basic mastery of the basics of communication processes in junior years to mastering the skills of communicating with patients, taking into account the chosen specialty in senior years