OPERATIONAL RESEARCH OF WEAR OF RAILWAY BUFFERS HEADS COVERED WITH ALUMINUM BRONZE

In recent years in Europe and in Poland is discernible trend to significant increase safety in rail transport. Safety improvement is realizing at many levels and in many aspects (organizational, systematic, technical etc.). Implementation of Safety and Maintenance Management Systems is an example of activities seeking to systematic increasing safety in rail in Europe. Similarly, on the part of technical solution there are discernible activities which are aimed to improve safety level. There are proposing new construction solutions, new control systems or new communication technologies which are designed to increase reliability and safety of this mode of transport. For innovations introduced in vehicles it is used to think about improvement safety almost only in the field of implementing enhancements in construction of running gear systems of vehicle. However, it is worth remembering that not only the bogie, wheelset or wheels are responsible for the proper cooperation of the vehicle with the track and its safe leading. Elements that have not been yet subjected to deeper analyzes are railway buffers whose proper maintenance and cooperation is a guarantee of correct vehicle dynamics, especially when passing through rail curves. This article presents the results of operational research of railway buffers whose heads were covered with an aluminum bronze layer. This solution has helped to increase the durability of their co-operating surfaces and has allowed the resignation of the now-proposed solution, which consists in periodically covering buffers heads with the grease which has a lot of defects

Pengaruh Komisaris Independen, Komite Audit Independen, Pergantian Chief Executive Officer dan Struktur Kepemilikan Saham Publik Terhadap Return On Asset (Studi Empiris pada Perusahaan Properti dan Real Estate di Bursa Efek Indonesia)

           The purpose of this study to analyze empirically the extent of the influence of the four independent variables are independent directors, independent audit committees, CEO turnover and structure of public ownership of the dependent variable is the return on assets(ROA). The study used secondary data on the Indonesia Stock Exchange, with a population of 51 companies and is considered complete and met the study criteria were 38 sample companies. The sample selection is done by purposive sampling in the field of real estate property during the five year study period the year 2009-2013. Model data analysis used multiple regression analysis (multiple regression) either partially or simultaneously.The test results proved and concluded that the proportion of independent directors, independent audit committees, CEO turnover and structure of public ownership according f and t test and a positive significant effect on return on assets(ROA).

Global burden of 288 causes of death and life expectancy decomposition in 204 countries and territories and 811 subnational locations, 1990–2021: a systematic analysis for the Global Burden of Disease Study 2021

BACKGROUND Regular, detailed reporting on population health by underlying cause of death is fundamental for public health decision making. Cause-specific estimates of mortality and the subsequent effects on life expectancy worldwide are valuable metrics to gauge progress in reducing mortality rates. These estimates are particularly important following large-scale mortality spikes, such as the COVID-19 pandemic. When systematically analysed, mortality rates and life expectancy allow comparisons of the consequences of causes of death globally and over time, providing a nuanced understanding of the effect of these causes on global populations. METHODS The Global Burden of Diseases, Injuries, and Risk Factors Study (GBD) 2021 cause-of-death analysis estimated mortality and years of life lost (YLLs) from 288 causes of death by age-sex-location-year in 204 countries and territories and 811 subnational locations for each year from 1990 until 2021. The analysis used 56 604 data sources, including data from vital registration and verbal autopsy as well as surveys, censuses, surveillance systems, and cancer registries, among others. As with previous GBD rounds, cause-specific death rates for most causes were estimated using the Cause of Death Ensemble model-a modelling tool developed for GBD to assess the out-of-sample predictive validity of different statistical models and covariate permutations and combine those results to produce cause-specific mortality estimates-with alternative strategies adapted to model causes with insufficient data, substantial changes in reporting over the study period, or unusual epidemiology. YLLs were computed as the product of the number of deaths for each cause-age-sex-location-year and the standard life expectancy at each age. As part of the modelling process, uncertainty intervals (UIs) were generated using the 2·5th and 97·5th percentiles from a 1000-draw distribution for each metric. We decomposed life expectancy by cause of death, location, and year to show cause-specific effects on life expectancy from 1990 to 2021. We also used the coefficient of variation and the fraction of population affected by 90% of deaths to highlight concentrations of mortality. Findings are reported in counts and age-standardised rates. Methodological improvements for cause-of-death estimates in GBD 2021 include the expansion of under-5-years age group to include four new age groups, enhanced methods to account for stochastic variation of sparse data, and the inclusion of COVID-19 and other pandemic-related mortality-which includes excess mortality associated with the pandemic, excluding COVID-19, lower respiratory infections, measles, malaria, and pertussis. For this analysis, 199 new country-years of vital registration cause-of-death data, 5 country-years of surveillance data, 21 country-years of verbal autopsy data, and 94 country-years of other data types were added to those used in previous GBD rounds. FINDINGS The leading causes of age-standardised deaths globally were the same in 2019 as they were in 1990; in descending order, these were, ischaemic heart disease, stroke, chronic obstructive pulmonary disease, and lower respiratory infections. In 2021, however, COVID-19 replaced stroke as the second-leading age-standardised cause of death, with 94·0 deaths (95% UI 89·2-100·0) per 100 000 population. The COVID-19 pandemic shifted the rankings of the leading five causes, lowering stroke to the third-leading and chronic obstructive pulmonary disease to the fourth-leading position. In 2021, the highest age-standardised death rates from COVID-19 occurred in sub-Saharan Africa (271·0 deaths [250·1-290·7] per 100 000 population) and Latin America and the Caribbean (195·4 deaths [182·1-211·4] per 100 000 population). The lowest age-standardised death rates from COVID-19 were in the high-income super-region (48·1 deaths [47·4-48·8] per 100 000 population) and southeast Asia, east Asia, and Oceania (23·2 deaths [16·3-37·2] per 100 000 population). Globally, life expectancy steadily improved between 1990 and 2019 for 18 of the 22 investigated causes. Decomposition of global and regional life expectancy showed the positive effect that reductions in deaths from enteric infections, lower respiratory infections, stroke, and neonatal deaths, among others have contributed to improved survival over the study period. However, a net reduction of 1·6 years occurred in global life expectancy between 2019 and 2021, primarily due to increased death rates from COVID-19 and other pandemic-related mortality. Life expectancy was highly variable between super-regions over the study period, with southeast Asia, east Asia, and Oceania gaining 8·3 years (6·7-9·9) overall, while having the smallest reduction in life expectancy due to COVID-19 (0·4 years). The largest reduction in life expectancy due to COVID-19 occurred in Latin America and the Caribbean (3·6 years). Additionally, 53 of the 288 causes of death were highly concentrated in locations with less than 50% of the global population as of 2021, and these causes of death became progressively more concentrated since 1990, when only 44 causes showed this pattern. The concentration phenomenon is discussed heuristically with respect to enteric and lower respiratory infections, malaria, HIV/AIDS, neonatal disorders, tuberculosis, and measles. INTERPRETATION Long-standing gains in life expectancy and reductions in many of the leading causes of death have been disrupted by the COVID-19 pandemic, the adverse effects of which were spread unevenly among populations. Despite the pandemic, there has been continued progress in combatting several notable causes of death, leading to improved global life expectancy over the study period. Each of the seven GBD super-regions showed an overall improvement from 1990 and 2021, obscuring the negative effect in the years of the pandemic. Additionally, our findings regarding regional variation in causes of death driving increases in life expectancy hold clear policy utility. Analyses of shifting mortality trends reveal that several causes, once widespread globally, are now increasingly concentrated geographically. These changes in mortality concentration, alongside further investigation of changing risks, interventions, and relevant policy, present an important opportunity to deepen our understanding of mortality-reduction strategies. Examining patterns in mortality concentration might reveal areas where successful public health interventions have been implemented. Translating these successes to locations where certain causes of death remain entrenched can inform policies that work to improve life expectancy for people everywhere. FUNDING Bill & Melinda Gates Foundation

Reducing the environmental impact of surgery on a global scale: systematic review and co-prioritization with healthcare workers in 132 countries

Abstract Background Healthcare cannot achieve net-zero carbon without addressing operating theatres. The aim of this study was to prioritize feasible interventions to reduce the environmental impact of operating theatres. Methods This study adopted a four-phase Delphi consensus co-prioritization methodology. In phase 1, a systematic review of published interventions and global consultation of perioperative healthcare professionals were used to longlist interventions. In phase 2, iterative thematic analysis consolidated comparable interventions into a shortlist. In phase 3, the shortlist was co-prioritized based on patient and clinician views on acceptability, feasibility, and safety. In phase 4, ranked lists of interventions were presented by their relevance to high-income countries and low–middle-income countries. Results In phase 1, 43 interventions were identified, which had low uptake in practice according to 3042 professionals globally. In phase 2, a shortlist of 15 intervention domains was generated. In phase 3, interventions were deemed acceptable for more than 90 per cent of patients except for reducing general anaesthesia (84 per cent) and re-sterilization of ‘single-use’ consumables (86 per cent). In phase 4, the top three shortlisted interventions for high-income countries were: introducing recycling; reducing use of anaesthetic gases; and appropriate clinical waste processing. In phase 4, the top three shortlisted interventions for low–middle-income countries were: introducing reusable surgical devices; reducing use of consumables; and reducing the use of general anaesthesia. Conclusion This is a step toward environmentally sustainable operating environments with actionable interventions applicable to both high– and low–middle–income countries

Ecuaciones Diferenciales-MA138-201000

La importancia de aprender ecuaciones diferenciales se debe a la gran diversidad de problemas de ingeniería que se modelan mediante estas. Los puntos a desarrollar son: modelado con ecuaciones diferenciales de primer orden y su resolución (ecuaciones diferenciales exactas u homogéneas) ecuaciones diferenciales lineales ordinarias de orden superior con coeficientes constantes operadores diferenciales y su aplicación series resolución de ecuaciones diferenciales lineales ordinarias de orden superior con coeficientes polinómicos mediante series de potencias la transformada de Laplace y sus aplicaciones sistemas de ecuaciones diferenciales lineales Delta de Dirac función periódica y su transformada Convolución y su transformada

Cálculo Ii-MA263-201200

En el mundo real donde tendrán que desarrollar su actividad los futuros ingenieros casi todos los problemas se desarrollan en un ámbito multidimensional entre otras cosas porque el espacio en que vivimos tiene tres dimensiones porque todos los procesos se desarrollan en el tiempo y porque es difícil encontrar una magnitud que no dependa de una gran número de otras magnitudes. En esta asignatura se desarrollarán los siguientes temas: Superficies cuadráticas Sistemas de coordenadas cilíndricas y esféricas las funciones vectoriales y su aplicación en el movimiento las funciones reales de varias variables el diferencial valores extremos de funciones reales de varias variables campos vectoriales integral doble integral triple integral de línea integral de superficie y sus aplicaciones

Cálculo Ii-MA263-201200

En el mundo real donde tendrán que desarrollar su actividad los futuros ingenieros casi todos los problemas se desarrollan en un ámbito multidimensional entre otras cosas porque el espacio en que vivimos tiene tres dimensiones porque todos los procesos se desarrollan en el tiempo y porque es difícil encontrar una magnitud que no dependa de una gran número de otras magnitudes. En esta asignatura se desarrollarán los siguientes temas: Superficies cuadráticas Sistemas de coordenadas cilíndricas y esféricas las funciones vectoriales y su aplicación en el movimiento las funciones reales de varias variables el diferencial valores extremos de funciones reales de varias variables campos vectoriales integral doble integral triple integral de línea integral de superficie y sus aplicaciones

Ecuaciones Diferenciales-MA138-201000

La importancia de aprender ecuaciones diferenciales se debe a la gran diversidad de problemas de ingeniería que se modelan mediante estas. Los puntos a desarrollar son: modelado con ecuaciones diferenciales de primer orden y su resolución (ecuaciones diferenciales exactas u homogéneas) ecuaciones diferenciales lineales ordinarias de orden superior con coeficientes constantes operadores diferenciales y su aplicación series resolución de ecuaciones diferenciales lineales ordinarias de orden superior con coeficientes polinómicos mediante series de potencias la transformada de Laplace y sus aplicaciones sistemas de ecuaciones diferenciales lineales Delta de Dirac función periódica y su transformada Convolución y su transformada

Cálculo Ii-MA263-201300

En el mundo real donde tendrán que desarrollar su actividad los futuros ingenieros casi todos los problemas se desarrollan en un ámbito multidimensional entre otras cosas porque el espacio en que vivimos tiene tres dimensiones porque todos los procesos se desarrollan en el tiempo y porque es difícil encontrar una magnitud que no dependa de una gran número de otras magnitudes. En esta asignatura se desarrollarán los siguientes temas: Superficies cuadráticas Sistemas de coordenadas cilíndricas y esféricas las funciones vectoriales y su aplicación en el movimiento las funciones reales de varias variables el diferencial valores extremos de funciones reales de varias variables campos vectoriales integral doble integral triple integral de línea integral de superficie y sus aplicaciones

Cálculo Ii-MA263-201300

En el mundo real donde tendrán que desarrollar su actividad los futuros ingenieros casi todos los problemas se desarrollan en un ámbito multidimensional entre otras cosas porque el espacio en que vivimos tiene tres dimensiones porque todos los procesos se desarrollan en el tiempo y porque es difícil encontrar una magnitud que no dependa de una gran número de otras magnitudes. En esta asignatura se desarrollarán los siguientes temas: Superficies cuadráticas Sistemas de coordenadas cilíndricas y esféricas las funciones vectoriales y su aplicación en el movimiento las funciones reales de varias variables el diferencial valores extremos de funciones reales de varias variables campos vectoriales integral doble integral triple integral de línea integral de superficie y sus aplicaciones