Effects of grain size on the performance of brake linings with Al2O3 additives

2021 ◽  
Vol 63 (9) ◽  
pp. 822-828
Author(s):  
Faruk Karaca ◽  
İlhan Can
Keyword(s):  
Developed Countries ◽  
Operating Conditions ◽  
World Health ◽  
International Labor Organization ◽  
Negative Effects ◽  
Material Content ◽  
Mechanical And Tribological Properties ◽  
Surface Areas ◽  
Lining Material ◽  
Health Organization

Abstract International organizations such as the World Health Organization (WHO) and the International Labor Organization (ILO) have called for an end to the use of asbestos and its derivatives in all sectors, primarily due to the negative effects on human and environmental health. For this reason, manufacturing and use of asbestos linings are also prohibited in most developed countries. For this purpose, there are many studies in the literature on the development and research of nonasbestos linings. In the literature, topics such as material content, production, cost, braking performances and mechanical properties of composite linings are commonly encountered. With the technology in the developing world, the working conditions of vehicle elements are getting more difficult. For this reason, during braking, the amount of energy required to be damped against the unit area in the pad surfaces increases, and since the lining surface areas get smaller, the operating temperatures exceed the limits of the material components. Under these conditions, the design of the lining material content is extremely important, taking into account parameters such as load and operating conditions, in order to slow down or stop the vehicle safely. In this study, the braking performance, mechanical and tribological properties of the samples obtained from a number of production processes such as mixing, pre-shaping and pressing of the materials by altering the particle sizes (50 μm, 75 μm and 125 μm) of the filler and friction materials used together with powdered alumina (Al2O3) were investigated. The most suitable parameters were determined as lining material for the samples obtained.

scholarly journals Synovial Joints. Tribology, Regeneration, Regenerative Rehabilitation and Arthroplasty

Lubricants ◽  
2021 ◽  
Vol 9 (2) ◽  
pp. 15
Author(s):  
Valentin L. Popov ◽  
Aleksandr M. Poliakov ◽  
Vladimir I. Pakhaliuk
Keyword(s):  
Treatment Effectiveness ◽  
Developed Countries ◽  
Operating Conditions ◽  
World Health ◽  
Pharmacological Agents ◽  
Synovial Joints ◽  
Wide Range ◽  
Fundamental Research ◽  
Serious Disease ◽  
Health Organization

Synovial joints are unique biological tribosystems that allow a person to perform a wide range of movements with minimal energy consumption. In recent years, they have been increasingly called “smart friction units” due to their ability to self-repair and adapt to changing operating conditions. However, in reality, the elements of the internal structure of the joints under the influence of many factors can degrade rather quickly, leading to serious disease such as osteoarthritis. According to the World Health Organization, osteoarthritis is already one of the 10 most disabling diseases in developed countries. In this regard, at present, fundamental research on synovial joints remains highly relevant. Despite the fact that the synovial joints have already been studied fully, many issues related to their operating, prevention, development of pathology, diagnosis and treatment require more detailed consideration. In this article, we discuss the urgent problems that need to be solved for the development of new pharmacological agents, biomaterials, scaffolds, implants and rehabilitation devices for the prevention, rehabilitation and improvement of the treatment effectiveness of synovial joints at various stages of osteoarthritis.

scholarly journals Trends in Tobacco Consumption – a Comparative Analysis of WHO European Region Countries

2020 ◽  
Vol 23 (2) ◽  
pp. 117-133
Author(s):  
Adam Mateusz Suchecki
Keyword(s):  
Developing Countries ◽  
Large Scale ◽  
Developed Countries ◽  
Tobacco Consumption ◽  
World Health ◽  
Negative Consequences ◽  
Negative Effects ◽  
Financial Policies ◽  
Nicotine Consumption ◽  
Health Organization

Tobacco consumption, as well as the consumption of any other psychoactive substances, lead to addictions, which is a serious problem that modern societies have to face. To reduce the negative consequences of nicotine consumption and to provide sustainable development, many governments, in both developed as well as developing countries, adopt policies to reduce tobacco production and consumption. For example, they implement various health programs to combat addiction, and they also provide appropriate financial and fiscal resolutions. Any actions taken at different decision-making levels are often bounded with economic and financial policies of a particular state, including fiscal policy. State interventionism concerning tobacco is most visible in developed countries such as the US, Canada, and European Union countries. Developing countries and Asian countries have also started to introduce regulations concerning tobacco consumption on a large scale in response to the negative effects of nicotinism. The main aim of the paper is to show consumption trends as well as the fiscal and price policies of tobacco products. The theoretical part is supplemented by data from reports and analyses presented by the World Health Organization (WHO).

scholarly journals The effect of excessive coca-cola consumption on the development of dental erosions

2012 ◽  
Vol 59 (3) ◽  
pp. 148-153 ◽  
Author(s):  
Zorica Ignjatovic ◽  
Ivana Stojsin ◽  
Tatjana Brkanic ◽  
Jovana Loncar
Keyword(s):  
Early Recognition ◽  
Signs And Symptoms ◽  
Good Health ◽  
Developed Countries ◽  
Epidemiological Studies ◽  
World Health ◽  
Negative Effects ◽  
Effective Prevention ◽  
Tooth Structure ◽  
Health Organization

The last few years have brought many changes in daily habits and overall lifestyle of human population, which is accompanied by increased exposure to acidic substances and increased consumption of acidic food. Regardless of the numerous warnings given by the World Health Organization about the harmful effects of carbonated beverages on general health, popularity and frequency of Coca-Cola usage have been growing steadily. Numerous epidemiological studies have demonstrated its potential negative effects on tooth structure. Good health education in developed countries has improved the awareness of the importance of oral hygiene; on the other hand, greater consumption of soft drinks has increased the incidence of dental erosions. Effective prevention and monitoring of dental erosions mostly depend on the knowledge about the etiology and early recognition of signs and symptoms of these lesions in clinical practice.

April 20 to 26, 2020 – World Immunization Week

2020 ◽  
pp. 76-79
Author(s):  
Oksana Rybachok
Keyword(s):  
Western Europe ◽  
Whooping Cough ◽  
Developed Countries ◽  
World Health ◽  
Modern World ◽  
Pneumococcal Infections ◽  
Preventive Vaccination ◽  
The Russian Federation ◽  
Health Organization ◽  
The Third World

Infectious diseases in the modern world continue to claim millions of human lives despite the achievements of medicine. While in developed countries the main cause of death is cancer and diseases of the cardiovascular system, it is the infectious processes that occupy leading positions in the structure of mortality in the third world countries. About 1.7 million children die from infections that could have been avoided by vaccination according to the World Health Organization. In contrast to the countries of Western Europe, where preventive vaccinations for the population are carried out for a fee, preventive vaccination in the Russian Federation is funded by the state. Immunoprophylaxis includes not only prevention of 12 major infections included in the calendar of preventive vaccinations (diphtheria, polio, tetanus, whooping cough, tuberculosis, measles, rubella, mumps, hepatitis B, pneumococcal infections and haemophilus influenzae, influenza), but also vaccination against 17 additional infections in case of epidemiological indications.

Healthcare Management During a Pandemic: The Other Side of the Coin for the Treatment of Covid-19 Infection

2021 ◽  
Vol 21 ◽  
Author(s):  
Danila De Vito ◽  
Antonio Fusco ◽  
Caterina Benincasa ◽  
Luca Laghi ◽  
Francesco M. Ceruso
Keyword(s):  
Healthcare Systems ◽  
Healthcare Management ◽  
World Health ◽  
Industrialized Countries ◽  
Negative Effects ◽  
Positive Effects ◽  
Worldwide Population ◽  
Related Risk ◽  
The Social ◽  
Health Organization

Background: World Health Organization (WHO) has increasingly improved the guidelines to tackle the spread of Coronavirus Disease 2019 (COVID-19) among the worldwide population. In this context, each country has introduced specific social, healthcare, political and macroeconomic measures to face COVID pandemic locally. Objective: The general aim of this comparative overview is to highlight the most significant effects of COVID-19 pandemic on the main healthcare systems. Also, we critically analyzed the macroeconomic variables and the most promising solutions to improve both healthcare system and its related risk management, taking into specific consideration the most industrialized countries. Method: The main strategy has been built on a renewed concept of the hospital, rebuilding the old concepts of “triage” and “intensive care”. Recently, COVID-19 hospitals have allowed to cater the patients affected by COVID-19. Moreover, the reshaping of several healthcare policies and requirements has led to several positive effects, such as the recruitment of a huge number of human resources in the healthcare systems. Nevertheless, several negative effects have also impacted the communities mostly subjected to infections. Conclusion: Undoubtedly, the national healthcare systems have somehow addressed the people’s needs, trying not to neglect the social, healthcare, economic and political aspects. In our overview, we have reported how the different actions taken in the last months, have resulted in different outcomes.

scholarly journals Cross-cultural differences in the epidemiology of unexplained fatigue syndromes in primary care

2003 ◽  
Vol 182 (3) ◽  
pp. 205-209 ◽  
Author(s):  
Petros Skapinakis ◽  
Glyn Lewis ◽  
Venetsanos Mavreas
Keyword(s):  
Primary Care ◽  
Secondary Analysis ◽  
Composite International Diagnostic Interview ◽  
Developed Countries ◽  
Diagnostic Interview ◽  
World Health ◽  
Less Developed Countries ◽  
Cross Cultural Differences ◽  
International Data ◽  
Health Organization

BackgroundUnexplained fatigue has been extensively studied but most of the samples used were from Western countries.AimsTo present international data on the prevalence of unexplained fatigue and fatigue as a presenting complaint in primary care.MethodSecondary analysis of the World Health Organization study of psychological problems in general health care. A total of 5438 primary care attenders from 14 countries were assessed with the Composite International Diagnostic Interview.ResultsThe prevalence of unexplained fatigue of 1-month duration differed across centres, with a range between 2.26 (95% CI 1.17–4.33) and 15.05 (95% CI 10.85–20.49). Subjects from more-developed countries were more likely to report unexplained fatigue but less likely to present with fatigue to physicians compared with subjects from less developed countries.ConclusionsIn less-developed countries fatigue might be an indicator of unmet psychiatric need, but in more-developed countries it is probably a symbol of psychosocial distress.

scholarly journals World Health Organization Sub-Types, Initial Treatment Outcome and Prognostic Study of Unselected Adult Patients with Acute Myeloid Leukaemia in Shanghai: An Analysis of 623 Cases

2009 ◽  
Vol 37 (4) ◽  
pp. 1191-1201 ◽  
Author(s):  
Y Ma ◽  
X Wang ◽  
X Xu ◽  
G Lin
Keyword(s):  
Prognostic Factor ◽  
Acute Myeloid Leukaemia ◽  
World Health Organization ◽  
Myeloid Leukaemia ◽  
Treatment Effect ◽  
Developed Countries ◽  
World Health ◽  
Health Organization ◽  
Acute Myeloid

This study investigated the complete remission (CR) rate and survival of 623 newly diagnosed patients with acute myeloid leukaemia (AML) in Shanghai, China, classified according to World Health Organization and French–American–British criteria, and compared the differences in treatment effect with those reported in developed countries and those reported in Shanghai from 1984 to 1994. Total CR rate was 66.5%, median survival was 18 months and estimated survival at 3 years was 30.8%. The 3-year relapse rate was 55.1%. These data showed that the CR rate was similar to that achieved in studies from developed countries, but long-term survival was worse. The CR rate and survival were increased markedly compared with data previously collected in Shanghai (1984-1994). Induction chemotherapeutic regimens based on idarubicin, daunorubicin or homoharringtonine all had similar CR rates and survivals. Karyotype was the most important prognostic factor. Multilineage dysplasia in de novo AML was not an independent prognostic factor. Improvement in the long-term treatment effect in China is an important challenge for the future.

scholarly journals The health effects of quarantine during the COVID-19 pandemic

Work ◽  
2020 ◽  
Vol 67 (3) ◽  
pp. 523-527
Author(s):  
Maryam Feiz Arefi ◽  
Amin Babaei-Pouya ◽  
Mohsen Poursadeqiyan
Keyword(s):  
Health Effects ◽  
World Health ◽  
Economic Activities ◽  
Negative Effects ◽  
Social Hygiene ◽  
Social Communications ◽  
Study Results ◽  
Control And Prevention ◽  
Health Organization ◽  
Made In

BACKGROUND: Quarantine is considered as an effective solution in the early stages of an epidemic. In the case of the coronavirus epidemic, quarantine was also recommended and implemented as a significant guideline to prevent the disease. However, despite the benefits of quarantine, there are also complications and problems. OBJECTIVE: The present study aimed to investigate the health effects of quarantine during the COVID-19 pandemic. METHODS: This study was conducted as a literature review through searching the databases Google Scholar, PubMed, and Science Direct for papers published before July 2020. The research was conducted based on the keywords “Coronavirus,” “COVID-19,” and “quarantine.” The references of the papers were also reviewed to find the ones not found in the databases. The guidelines published by reputable organizations such as the World Health Organization (WHO) and Centers for Disease Control and Prevention (CDC) were used in this study. RESULTS: Although quarantine is applied as an important and primary solution in the outbreak of epidemics, in cases of pandemics, it may not be free of negative effects on individuals and public health. However, because of the need to reopen and restart social and economic activities, some changes should be made in lifestyles and work activities. Using cyberspace and telework can be helpful. As the findings showed, COVID-19 bubbles can be used to restore social communications. CONCLUSION: Using masks, avoiding unnecessary gatherings, complying with personal and social hygiene, and respecting social distancing can be valuable solutions that, if implemented properly, can decrease the rate of the disease significantly. It is also emphasized that quarantine is still necessary and important as the best solution for sick people and individuals who are suspected carriers of the disease.

scholarly journals Osteopathic correction in the treatment of pain in the lower back

2020 ◽  
pp. 140-146
Author(s):  
V. O. Belash ◽  
Yu. O. Novikov
Keyword(s):  
Back Pain ◽  
Developed Countries ◽  
Economic Problem ◽  
World Health ◽  
Randomized Controlled ◽  
Lower Back ◽  
The World ◽  
Working Age ◽  
Acute Back Pain ◽  
Health Organization

According to experts of the World Health Organization the lower back pain (LBP) prevalence in developed countries reaches the pandemic size, and it is a serious medical and socio-economic problem. Acute back pain is transformed into chronic in 10–20 % of working age patients′ cases; this causes serious psychological disorders appearing, forms painful behavior and persists even when the initial pain trigger is eliminated. Data from metaanalyses of randomized controlled trials indicate the effectiveness of the osteopathic approach in the treatment of LBP patients. At the same time the osteopathic correction is effective not only for acute pain, but also for chronic pain. A case from clinical practice is described demonstrating the possibility of osteopathic correction of a LBP patient.

scholarly journals Evaluation of the Therapeutic Effectiveness of Combined Action Antiallergic Drugs in Monotherapy of Allergic Conjunctivitis

2020 ◽  
Vol 17 (1) ◽  
pp. 117-123
Author(s):  
N. G. Zumbulidze ◽  
V. M. Khokkanen ◽  
I. B. Litvin
Keyword(s):  
Allergic Conjunctivitis ◽  
Systemic Exposure ◽  
Local Therapy ◽  
Allergic Diseases ◽  
Developed Countries ◽  
World Health ◽  
Common Disease ◽  
Ophthalmic Manifestations ◽  
The World ◽  
Health Organization

According to statistical studies in recent decades, there has been an increase of allergic diseases in most countries of the world. Predisposing factors are the deterioration of the environmental situation, the total “chemicalization” of life and the forced use of drugs. Twenty years ago, the World Health Organization called the new century “the century of allergies” and the disease itself as an “epidemic”. As time has shown, these forecasts have come true: from 2001 to 2010, the number of allergic people in the world increased by 20 % and many of these patients suffer from ophthalmic manifestations of the pathology: the eyes are involved in the process in almost every second case. This is due to the fact that the eyes are directly exposed to the environment and a variety of external allergens. The most common disease of an eye-allergic nature is allergic conjunctivitis: approximately 15 % of the total population of economically developed countries suffer from it. Allergic blepharitis, eyelid dermatitis, keratitis, iritis, uveitis, retinitis and optic neuritis are much less common. The following manifestations are typical for allergic conjunctivitis: burning, lacrimation, pruritus, hyperemia of the eyelids and conjunctiva, photophobia. In the case of a transition to a chronic form, pronounced tissue changes are observed. Therefore, timely diagnosis and effective treatment certainly have a positive effect on the quality of life of the patient and the course of the disease. The treatment of patients with allergic conjunctivitis, first of all, consists in the maximum possible restriction of contact with the allergen. During desensitizing therapy, local and general drugs are used. Numerous studies have proven the advantage of targeted and effective antiallergic local therapy compared with systemic exposure. Currently used local ophthalmic antiallergic drugs belonging to various groups. The tactics of their use is determined by the acuity, severity and etiology of the process. When choosing a drug, in some cases, you should focus on the presence of substances that provide a double mechanism of action: a pronounced antihistamine activity in combination with the stabilization properties of mast cells, which has a quick and long therapeutic effect. This study evaluated efficacy of Vizallergol (olopatadin 0.2 %) application in cases of allergic conjunctivitis in 239 patients was evaluated. The medication arrested the symptoms of allergic conjunctivitis in 89 % of patients, at that the mean period of treatment made 10.7 ± 0.3 days. In the treatment of allergic conjunctivitis, the therapeutic efficacy of Vizallergol 0.2 % was comparable to opatanol 0.1 % and was found to be more comfortable for most patients due to the convenience of a single use.

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