“…The casing leakage phenomenon seriously affects the safety and economic problems of oil and gas production and transportation. …”
Enlace del recurso
Enlace del recurso
Enlace del recurso

“…In 2019, 93% of road traffic injury related mortality occurred in low- and middle-income countries, an estimated burden of 1.3 million deaths. This problem is growing; by 2030 road traffic injury will the seventh leading cause of death globally. …”
Enlace del recurso
Enlace del recurso
Enlace del recurso

“…CONCLUSIONS: Although the proposed sample size calculators can be instrumental to design future cross-sectional surveys, the choice of a particular sample size must be seen as a much broader exercise that involves weighting statistical precision with ethical issues, available human and economic resources, and possible time constraints. …”
Enlace del recurso
Enlace del recurso
Enlace del recurso

“…We apply this method for ranking different crop technological products of grain legumes and dry cereals based on their respective impacts on poverty, child malnutrition and economic benefits in more than 40 countries in eight different geographic zones across South Asia and Sub-Saharan Africa. • The developed algorithms and interface can help rank different options based on the weights (preferences) of their respective outcome indicators. • The interface allows for changing the weights (preferences) and automatically generates new ranking tables and graphs accordingly, which can serve for scenario simulations, which saves time compared to manually performing these calculations.…”
Enlace del recurso
Enlace del recurso
Enlace del recurso

“…The stacking weights can be calculated using any financial approach to the portfolio optimization problem. …”
Enlace del recurso
Enlace del recurso
Enlace del recurso

“…Methodology of studies consisted of eight stages, which included, among others: defining data matrices, calculating the variability coefficient for all variables, which variability coefficient was under 10 %, division of variables into stimulants and destimulants, selection of the method of variable normalisation, developing matrices of normalised data, selection of the formula and calculating the aggregated indicator of the relative level of sustainable development of the EU countries, calculating partial development indicators for three studies dimensions: social, economic and environmental and the classification of the EU countries according to the relative level of sustainable development. …”
Enlace del recurso
Enlace del recurso
Enlace del recurso

“…Land degradation is a global problem that seriously threatens human society. However, in China and elsewhere, ecological restoration still largely relies on a traditional approach that focuses only on ecological factors and ignores socioeconomic factors. …”
Enlace del recurso
Enlace del recurso
Enlace del recurso

“…HIV/AIDS and COVID-19 co-infection is a common global health and socio-economic problem. In this paper, a mathematical model for the transmission dynamics of HIV/AIDS and COVID-19 co-infection that incorporates protection and treatment for the infected (and infectious) groups is formulated and analyzed. …”
Enlace del recurso
Enlace del recurso
Enlace del recurso

“…On this basis, the weight of each indicator is calculated to find the deficiencies in the development of some digital economic fields by the improved entropy method. …”
Enlace del recurso
Enlace del recurso
Enlace del recurso

“…RESULTS: In total, 896 different health states were reported; 24.1% did not report any problems. Most problems were reported with pain/discomfort. …”
Enlace del recurso
Enlace del recurso
Enlace del recurso

“…The significance of the effect of each variable was tested by means of an asymptotic chi-square test, or Fisher's exact (factorial) test and the risk ratios were calculated. RESULTS: Based on the chi-square test and the risk ratios of the aggregated data, three risk factors were found to be significant in the development of obesity – gender, type of residence and socio-economic status. …”
Enlace del recurso
Enlace del recurso
Enlace del recurso

“…To solve the above problems, this paper proposes new spiral stiffened rib thin-walled steel pipe concrete laminated members to obtain better force and economic performance. …”
Enlace del recurso
Enlace del recurso
Enlace del recurso

“…BACKGROUND: Violence is a leading public health problem worldwide. Beyond the pain and suffering, violence has a significant economic impact on a country’s health, policing and judicial services. …”
Enlace del recurso
Enlace del recurso
Enlace del recurso

“…This book contributes to making urban rail transport fast, punctual and energy-efficient –significant factors in the importance of public transportation systems to economic, environmental and social requirements at both municipal and national levels. …”
Enlace del recurso
Enlace del recurso

“…Although all the VBID studies provided evidence that implementation of VBID might have a small favorable effect on medication adherence, none provided the information that payers need to make an informed decision about VBID because of serious problems in reporting, program design, and effect calculation. …”
Enlace del recurso
Enlace del recurso
Enlace del recurso

“…Urban green space has environmental benefits of purifying the air, reducing the heat island effect and providing the social and economic benefits of rest places and social platforms. …”
Enlace del recurso
Enlace del recurso
Enlace del recurso

“…At present, there are some problems in tourism professional villages, such as imperfect management and inaccurate prediction of future development, which affect the rational allocation of tourism resources. …”
Enlace del recurso
Enlace del recurso
Enlace del recurso

“…BACKGROUND: HCV virus (HCV) is a significant global problem with wide-ranging socio-economic impacts. …”
Enlace del recurso
Enlace del recurso
Enlace del recurso

“…Although the problem is important, permeated by aspects of iniquity, Brazilian policies seem to be protecting families from catastrophic expenditure on health and on medicine.…”
Enlace del recurso
Enlace del recurso
Enlace del recurso

“…OBJECTIVE: To facilitate installation of telemedicine systems/units in Greek remote areas, this article presents results of a cost-benefit analysis for two Greek islands, Patmos and Leros, using specific economic criteria. METHODS: Net present value (NPV), internal rate of return (IRR), and payback period were calculated, in order to monetize the economic benefits and the costs savings, estimate the depreciation of each project, and highlight the social benefits. …”
Enlace del recurso
Enlace del recurso
Enlace del recurso