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Tytuł:
A quick method for Bond work index approximate value determination
Autorzy:
Todorovic, D.
Trumic, M.
Andric, L.
Milosevic, V.
Powiązania:
https://bibliotekanauki.pl/articles/110265.pdf
Data publikacji:
2017
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
Bond work index
grinding
kinetics
Opis:
The Bond work index is a measure of ore resistance to crushing and grinding and is determined using the Bond grindability test. Its value constitutes ore characteristic and is used for industrial comminution plants designing. Determining the Bond work index value is quite complicated, time-consuming and requires trained operating personnel and therefore is subjected to errors. A quick method for the Bond work index approximate value determination, which is based on the first order grinding kinetics, is presented in this paper. Comparative experiments for the Bond work index value determination using the standard and quick procedures were carried out on samples of limestone and andesite, and on composite samples containing both ores in different mass proportions. This quick procedure can be performed with an arbitrary number of milling cycles, depending on the desired accuracy.
Źródło:
Physicochemical Problems of Mineral Processing; 2017, 53, 1; 321-332
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Leaching of coal by trioxoboric acid for coal clearing
Autorzy:
Bilgin, Oyku
Hacıfazlıoğlu, Hasan
Sert, Dilara
Powiązania:
https://bibliotekanauki.pl/articles/2146861.pdf
Data publikacji:
2021
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
trioxoboric acid
coal beneficiation
leaching
work index
Opis:
Trioxoboric acid (H3BO3) is a white weakly soluble acid produced from boron minerals. This acid type was used for the first time in this study for ash and sulfur removal from coal. Ash and sulfur are the most important impurities in the content of coal and have significant effects on environmental pollution. It is possible to remove ash and sulfur by H3BO3 leaching. However, there have not been enough studies in this area and the performance of trioxoboric acid has not been fully demonstrated. In this study, leaching performance of trioxoboric acid and other strong acids (hydrofluoric, hydrochloric and sulfuric acids) has been demonstrated. Trioxoboric acid removed ash and sulfur from coal by 41.18% and 32.16%, respectively. This acid can compete especially with hydrochloric and sulfuric acid in sulfur removal. However, hydrofluoric acid provided the best results in ash and sulfur removal.
Źródło:
Physicochemical Problems of Mineral Processing; 2021, 57, 5; 129--136
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Grindability characterization and work index determination of alluvial ferro-columbite deposits for efficient mineral processing
Autorzy:
Nzeh, Nnaemeka Stanislaus
Adeleke, Abraham A.
Popoola, Patricia Abimbola
Powiązania:
https://bibliotekanauki.pl/articles/24085905.pdf
Data publikacji:
2023
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
alluvial
columbite
mineral
comminution
milling
work index
energy
grindability
Opis:
This study emphasizes on the physicochemical and grindability characteristics and work index of an alluvial formed silica dominated ferro-columbite mineral from Rayfield-Jos minefields in Plateau state, Nigeria. Investigations were also carried out in order to determine the mineralogy of the mineral deposits and most essentially the actual energy consumed during comminution and milling of the mineral so as to achieve the liberation size prior to high efficient mineral processing or beneficiation and the extraction of value metals. The distribution of the mineral particles as well as their sizes was determined, with a mineral liberation size fraction range essentially established as -150+90 μm particle sizes. Mass percentage of each size fraction obtained from PSD analysis conducted before and after comminution was also determined, obtaining 80% passing for both the mineral feeds and comminuted products. Berry and Bruce modified Bond’s work index was therefore obtained, and was determined to be within the range of 2.0414 to 2.5667 kWh/ton. Hence, the energy consumed or required to comminute or grind the Fe-columbite mineral to 80% passing is expected to fall within the range of 0.3613 to 0.4543 kWh. Thus, it could be said that a low milling work index as well as moderately low energy is required for comminution and this can be attributed to the mineralogy, mineral source and alluvial formation of the mineral reserve. Therefore, the grindability/PSD result of the mineral sample indicates that its mineralogy is considered a class of moderately soft mineral type in terms of texture with easy grindability.
Źródło:
Physicochemical Problems of Mineral Processing; 2023, 59, 3; art. no. 170297
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Comparison of statistical versus stochastic models for Work Index determination in quartz-marble mixtures
Autorzy:
Perez, Sebastián
Vargas, Juan
Mellado, Miguel
Quevedo Caro, Ricardo
Jarufe, Juan
Hurtado Cruz, Juan Pablo
Muñoz Lagos, Angélica Patricia
Jara Muñoz, Pamela Paz
Powiązania:
https://bibliotekanauki.pl/articles/2016476.pdf
Data publikacji:
2021
Wydawca:
Politechnika Wrocławska. Wydział Geoinżynierii, Górnictwa i Geologii. Instytut Górnictwa
Tematy:
Work Index
Bond grindability
mineral mixture
Monte Carlo
stochastic model
Opis:
The required work for ore trituration is represented by the Bond Work Index value and is determined by the grindability test for ball mills. This article examines the grinding behavior of ore blends with different mechanical properties in standard ball mills. The goal of this research was to compare statistic and stochastic models of the Work Index value for mixtures of quartz and marble at different proportions of each material. Quartz and marble bearing rocks were selected for this study due to the high difference between the Work Index value of each material, making the variability of the results more evident. Work Index values obtained for each mixture are shown, from which a deterministic model was proposed defined by data regression. The novelty of this research lies in the non-linear model, which was the best fit for the Work Index value of the quartz-marble blends. Our methodology allows us to build more accurate models and can be used for quartz-marble blends and other materials.
Źródło:
Mining Science; 2021, 28; 127-140
2300-9586
2353-5423
Pojawia się w:
Mining Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Kinetic grinding test approach to estimate the ball mill work index
Autorzy:
Gharehgheshlagh, H. H.
Powiązania:
https://bibliotekanauki.pl/articles/109794.pdf
Data publikacji:
2016
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
work index
Bond method
kinetic grinding test
grindability
ball mill
Opis:
The standard Bond method is the most acceptable method for designing and selecting ball/rod mills described by their basic parameter called work index (Wi). The standard Bond method is a tedious time consuming procedure requiring at least 7 – 10 grinding cycles, so that many researchers have tried to simplify this method to be able to perform a rapid calculation of a work index. This study aims to develop a new approach toward estimating the Bond ball mill work index (BBWI) by applying a series of kinetic grinding tests with Bond standard mill. Establishing a series of relationships between grinding parameters and Bond equation parameters, this approach is fast and practical due to eliminating laboratory control steps while reducing the number of milling steps. In this scope, thirteen ore samples were used to compare Wi values obtained by standard Bond method with those of the proposed kinetic approach. The kinetic periods were determined as 0.33, 1, 2, 4 and 8 minutes. The results of kinetic tests were found to be logical and acceptable as they were so close to the values obtained by Bond standard method, for all samples error was ≤ 2.60%. It was therefore concluded that the proposed approach could be considered as a simple yet practical alternative for the standard Bond method.
Źródło:
Physicochemical Problems of Mineral Processing; 2016, 52, 1; 342-352
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Porównanie rzeczywistego i wyznaczonego teoretycznie zużycia energii dla młyna kulowego
Comparison of real and theoretically estimated energy consumption for ball grinder
Autorzy:
Foszcz, D.
Gawenda, T.
Krawczykowski, D.
Powiązania:
https://bibliotekanauki.pl/articles/350126.pdf
Data publikacji:
2006
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
rozdrabnianie
zużycie energii
wskaźnik pracy Bonda
comminution energy consumption
Bond work index
Opis:
W artykule omówiono energetyczne teorie rozdrabniania oraz metodykę określania energochłonności procesu mielenia i wyznaczania indeksu pracy Bonda. Podano przykłady adaptacji określonych wskaźników energochłonności wynikających z prezentowanych teorii rozdrabniania do warunków rzeczywistych pracy urządzeń rozdrabniających. Przedstawiono wyniki oznaczeń indeksu pracy Bonda dla rudy dolomitowej przerabianej w O/ZWR Rejon Polkowice KGHM Polska Miedź S.A.. Dokonano porównania rzeczywistego zużycia energii przez młyn kulowy w odniesieniu do wyznaczonych indeksów pracy Bonda. Porównania dokonano dla danych z eksperymentu przemysłowego, w którym mierzono pobór energii przy zmiennym przerobie młyna.
The energetic theories of comminution, methodology of grinding process energy consumption calculation and determination of Bond work index were discussed in the paper. The examples of certain energy consumption indexes adaptation from presented comminution theories for real work conditions of comminution devices were presented. The Bond work indexes results for dolomite ore, being processed in O/ZWR Polkowice Region KGHM Polska Miedź S.A. were shown in the paper. The real energy consumption for ball grinder comparison to determined Bond work indexes was done. The comparison was conducted for industrial experiment data, which purpose was to measure energy consumption by various grinder processing modes.
Źródło:
Górnictwo i Geoinżynieria; 2006, 30, 3/1; 79-90
1732-6702
Pojawia się w:
Górnictwo i Geoinżynieria
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Ocena zdolności do pracy pracowników starszych wg WAI - wyniki wybranych polskich badań
Work Ability Index (WAI) of older workers: a review of selected Polish research
Autorzy:
Malińska, M.
Powiązania:
https://bibliotekanauki.pl/articles/179580.pdf
Data publikacji:
2017
Wydawca:
Centralny Instytut Ochrony Pracy
Tematy:
zdolność do pracy
wskaźnik zdolności do pracy
WAI (Work Ability Index)
pracownik starszy
work ability
work ability index
WAI
older workers
Opis:
W artykule przedstawiono analizę polskich badań prowadzonych w zakresie zdolności do pracy pracowników starszych ocenianych według WAI (Work Ability Index). Omówiono definicję starszego pracownika, a także zwrócono uwagę na związek pomiędzy zdolnością do pracy zdrowych i przewlekle chorych pracowników a poszczególnymi czynnikami zawodowymi i pozazawodowymi, takimi jak wiek, rodzaj wykonywanej pracy, zawód, wykształcenie, wydolność fizyczna, gorące środowisko, styl życia, praca zmianowa, stres zawodowy oraz dopasowanie do organizacji.
This article presents an analysis of Polish research on older workers' work ability evaluated with The Work Ability Index (WAI). It presents a definition of older workers and the relationship between work ability among healthy and chronically ill employees, and occupational and non-occupational determinants of work ability, such as age, kind of work, occupation, education, physical capacity, hot environment, lifestyle, shift work, stress and person-organization fit.
Źródło:
Bezpieczeństwo Pracy : nauka i praktyka; 2017, 5; 16-20
0137-7043
Pojawia się w:
Bezpieczeństwo Pracy : nauka i praktyka
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Work Ability and Musculoskeletal Disorders Among Workers From a Public Health Institution
Autorzy:
Monteiro, M. S.
Alexandre, N. M. C.
Ilmarinen, J.
Rodrigues, C. M.
Powiązania:
https://bibliotekanauki.pl/articles/89943.pdf
Data publikacji:
2009
Wydawca:
Centralny Instytut Ochrony Pracy
Tematy:
work-related musculoskeletal disorders (WMDs)
work ability
work ability index
cross-sectional studies
Opis:
Objective. The study investigated the associations between diagnosed musculoskeletal disorders (MSD), work ability and demographics, work and lifestyle characteristics in a public health institution with a variety of occupations. Methods. A cross-sectional study was carried out in a public health institution in Brazil. The subjects (n = 168) aged 20–69 answered a questionnaire on demographics, work, lifestyle characteristics and the work ability index. Results. A univariate regression analysis was carried out with the presence of MSD as a dependent variable. Association was found in relation to the age group, type of work demand, tenure at the institution, body mass index, work in the nutrition and laundry sectors, being a maid in the previous job, auxiliary service and auxiliary maintenance occupations, work ability in relation to physical and mental demands, estimated work impairment due to diseases, sick leave in the past year, own prognosis of work ability in 2 years’ time and mental resources: enjoying daily activities, being active and alert, being full of hope for the future. Conclusion. The presence of MSD affected several aspects of work ability.
Źródło:
International Journal of Occupational Safety and Ergonomics; 2009, 15, 3; 319-324
1080-3548
Pojawia się w:
International Journal of Occupational Safety and Ergonomics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Bond´s work index estimation using non-standard ball mills
Autorzy:
Arellano-Piña, Ramón
Sanchez-Ramirez, Elvia Angélica
Pérez-Garibay, Roberto
Gutiérrez-Pérez, V.H.
Powiązania:
https://bibliotekanauki.pl/articles/27323664.pdf
Data publikacji:
2023
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
Bond´s Work Index
rocks grinding
laboratory scale ball mills
ore characterization
non-standard ball mills
Opis:
Ore concentrators seek the stability of processes by feeding blends of rocks with average hardness and ore content. Therefore, large amounts of samples must be characterized in a short time. The Bond Work Index () is a common technique for the estimation of hardness and energy requirement for comminution using ball mills. However, this technique is time-consuming (close to 5 hours) and liable to experimental errors. This work contributes to obtaining new models for rapid Bond Work Index estimation using non-standard dimensions mills. This was done by proposing grinding tests using four types of ores and four mills of different dimensions, including the standard Bond ball mill (BBM). For all tests it was kept constant: (a) critical speed (91%), and (b) mill charge by volume (10.5%), varying the amount of fresh feed according to its density. The results showed that using the non-standard mills (between 20 and 35 cm in diameter), the Bond´s model constants (=0.23; = 0.82, and = 44.5), are unable to predict the Work Index properly. Therefore, these constants must be recalculated using linear models based on mill diameter. With the models proposed for , , and , the Bond Work Index (kWh/t) can be rapidly estimated (less than 2 hours) and show a high accuracy for mills of non-standard dimensions (R2= 0.96).
Źródło:
Physicochemical Problems of Mineral Processing; 2023, 59, 6; art. no. 172458
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Work ability of aging teachers in Bulgaria
Autorzy:
Vangelova, Katya
Dimitrova, Irina
Tzenova, Bistra
Powiązania:
https://bibliotekanauki.pl/articles/2162012.pdf
Data publikacji:
2018-10-23
Wydawca:
Instytut Medycyny Pracy im. prof. dra Jerzego Nofera w Łodzi
Tematy:
ageing
teachers
work ability index
work ability
cross-sectional study
adverse health effects
Opis:
Objectives The work ability of aging teachers is of special interest because of high risk of stress. The aim of the study was to follow the work ability of aging teachers and compare it with that of aging non-teacher professionals. Material and Methods The study included 424 teachers of age ≤ 44 years old (N = 140) and ≥ 45 years old (N = 284), with about 10% male teachers in both age groups, matched by sex and age with non-teacher professionals. Work ability was assessed by means of the Work Ability Index (WAI). Chi2 tests and regression analyses were used for studying WAI scales ratings, diagnosed by physician diseases and WAI ratings. Results Our data shows comparatively high work ability for both age groups of teachers but WAI of aging teachers was significantly lower in comparison to their younger colleagues as well as aging non-teacher professionals. About 80% of aging groups reported diseases diagnosed by physicians. Cardiovascular, musculoskeletal and respiratory diseases were the most frequently reported by aging teachers, while teachers ≤ 44 years old reported respiratory, cardiovascular, neurological and sensory diseases. With aging significantly higher rates of arterial hypertension, diabetes, injury to hearing and mental disorders were reported by teachers as compared to aging non-teacher professionals. The rates of reported repeated infections of respiratory tracts were high in both age groups of teachers, especially in the group of aging teachers. The estimated work ability impairment due to the disease showed the significant effect of aging for teachers as well as the significant difference when comparing aging teachers and non-teacher professionals. Conclusions Our data shows high work ability for both age groups of teachers but significantly lower for aging teachers accompanied with higher rates of psychosomatic diseases, including hearing impairment and respiratory diseases. Preservation of teacher health could contribute to maintenance of their work ability and retention in the labor market. Int J Occup Med Environ Health 2018;31(5):593–602
Źródło:
International Journal of Occupational Medicine and Environmental Health; 2018, 31, 5; 593-602
1232-1087
1896-494X
Pojawia się w:
International Journal of Occupational Medicine and Environmental Health
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The relationship between physical activity and work ability – A cross-sectional study of teachers
Autorzy:
Grabara, Małgorzata
Nawrocka, Agnieszka
Powerska-Didkowska, Aneta
Powiązania:
https://bibliotekanauki.pl/articles/2161793.pdf
Data publikacji:
2017-10-18
Wydawca:
Instytut Medycyny Pracy im. prof. dra Jerzego Nofera w Łodzi
Tematy:
health behavior
lifestyle
health promotion
occupational health
work ability index
exercises
Opis:
Objectives: To assess relationship between physical activity (PA) and perceived work ability amongst teachers from the Upper Silesia, Poland. Material and Methods: The study involved 171 teachers (129 women, 42 men) of primary and secondary schools of the Upper Silesia, Poland. Physical education teachers were excluded from the study. The level of PA was estimated using the International Physical Activity Questionnaire short version, and perceived work ability was estimated using Work Ability Index (WAI). Results: Male teachers had significantly higher levels of vigorous-intensity PA, moderateintensity PA, and total weekly PA than female teachers. The recommendations of the World Health Organization (WHO) met 46% of studied women and 74% of men. Work ability did not differ between male and female teachers. Work ability was related to age, body mass index (BMI), and PA (vigorous-intensity PA, moderate-intensity PA, total weekly PA). The female teachers with excellent or good WAI had significantly higher levels of vigorous-intensity PA, moderate-intensity PA and total weekly PA than female teachers with moderate or poor WAI. Conclusions: The teachers involving in high or moderate intensity PA could improve their work ability. Further studies should focus on relation between physical activity and work ability among teachers of various age and seniority, from both, urban and rural schools. Int J Occup Med Environ Health 2018;31(1):1–9
Źródło:
International Journal of Occupational Medicine and Environmental Health; 2018, 31, 1; 1-9
1232-1087
1896-494X
Pojawia się w:
International Journal of Occupational Medicine and Environmental Health
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
An assessment of the work ability, disability and quality of life of working people of pre-retirement and retirement age in Poland – a cross-sectional pilot study
Autorzy:
Ćwirlej-Sozańska, Agnieszka
Widelak, Maria
Wiernasz, Marlena
Wawrzykowska, Iwona
Turkosz, Natalia
Powiązania:
https://bibliotekanauki.pl/articles/2086121.pdf
Data publikacji:
2021-01-07
Wydawca:
Instytut Medycyny Pracy im. prof. dra Jerzego Nofera w Łodzi
Tematy:
quality of life
disability
Work Ability Index
work ability
older workers
pre-retirement and retirement age
Opis:
ObjectivesThe aim of this work was to assess the work ability, health status, disability and quality of life of working people of pre-retirement and retirement age, as well as to analyze factors affecting the ability to perform work in older age.Material and MethodsA cross-sectional pilot study was conducted in the Podkarpackie and Świętokrzyskie voivodeships, Poland, in randomly selected workplaces of intellectual nature. It was carried out by means of direct interviews in the workplace of the surveyed people, using the Work Ability Index, a questionnaire based on the WHO Disability Assessment Schedule 2.0, the WHO Quality of Life-BREF questionnaire, the Geriatric Depression Scale, and the Visual Analogue Scale (VAS). The criteria for inclusion were: age 55–75 years and informed consent to participate in the study. Overall, 201 complete questionnaires were included in the analysis. Demographic data is presented using descriptive statistics measurements. The logistic regression model was used to identify factors related to work ability.ResultsThe vast majority (69.66%) of employees performing intellectual work had moderate or poor work ability. The average level of general disability in the studied group was mild (20.65), and the quality of life was quite good (64.73). A significant problem among the surveyed people was a quite high average level of pain (VAS = 3.99), the occurrence of depression (73.63%), as well as musculoskeletal (64.18%) and cardiovascular diseases (52.24%). The most important factor contributing to a better work ability was the adaptation of the workplace to functional and healthrelated needs (OR = 7.79). Psychological well-being (OR = 1.12), cognitive performance (OR = 0.97) and a smaller number of chronic diseases (OR = 0.58) were also important factors.ConclusionsPreparation of elderly people for professional activity should be conducted in 2 different ways, i.e., by means of education and implementation of an active, healthy lifestyle, and increasing control over one’s own health and factors determining it, as well as by the proper organization of working space, and quick access to treatment and rehabilitation, especially in the case of musculoskeletal and cardiovascular diseases.
Źródło:
International Journal of Occupational Medicine and Environmental Health; 2021, 34, 1; 69-85
1232-1087
1896-494X
Pojawia się w:
International Journal of Occupational Medicine and Environmental Health
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Work Ability of Workers in Different Age Groups in a Public Health Institution in Brazil
Autorzy:
Monteiro, M. S.
Ilmarinen, J.
Filho, H. R. C.
Powiązania:
https://bibliotekanauki.pl/articles/89793.pdf
Data publikacji:
2006
Wydawca:
Centralny Instytut Ochrony Pracy
Tematy:
aging workers
work ability index
cross-sectional study
zdolność do pracy
Brazylia
starsi pracownicy
Opis:
Objectives. The aim of this study was to determine the associations between demographics, work, lifestyle, housework, and the work ability of workers. Methods. Employees between the ages of 20 and 69 (N = 651), employed at a Brazilian public institution, responded to a questionnaire on demographics, work, lifestyle characteristics, and work ability. Results. Work ability decreased significantly with age among the women. The younger group had higher scores on the work ability index than the older age groups, except for mental resources. The logistic regression analysis showed that higher age, lower education, and long work history at the institution were significantly associated with reduced work ability. Conclusions. The progressive aging, the low level of education, and the long duration work in the studied institution were related to a reduction in work ability, which increases the risk of work disability or early retirement.
Źródło:
International Journal of Occupational Safety and Ergonomics; 2006, 12, 4; 417-427
1080-3548
Pojawia się w:
International Journal of Occupational Safety and Ergonomics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Quality of life, work ability and other important indicators of women’s occupational health
Autorzy:
Tavakoli-Fard, Negah
Mortazavi, Seyed-Alireza
Kuhpayehzadeh, Jalil
Nojomi, Marzieh
Powiązania:
https://bibliotekanauki.pl/articles/2177077.pdf
Data publikacji:
2015-08-25
Wydawca:
Instytut Medycyny Pracy im. prof. dra Jerzego Nofera w Łodzi
Tematy:
women workers
work ability index
quality of life
job satisfaction
women’s health
Mental Health
Opis:
Objectives Work ability may be considered as an important aspect of well-being and health status. One of the most important factors in association with work ability is health-related quality of life (HRQoL). The aim of this study has been to determine the association between work ability, individual characteristics and HRQoL of female workers. Material and Methods The design of this study has been cross-sectional. The work ability index (WAI) and Short-Form General Health Survey (SF-12) questionnaires were used to collect data. Three hundred and twenty female workers were selected from food supplier factories in Karaj. One-way analysis of variance, Pearson’s correlation analysis, independent sample t-test and multiple linear regression methods were used to analyze data. Results Mean (M) and standard deviation (SD) of the WAI stood at 35.02 and 5.57, respectively. The categories of the WAI for women being as follows: 8.8% poor, 62% moderate, 25.4% good and 3.7% excellent. Mean±SD for the physical component summary (PCS) and mental component summary (MCS) of quality of life was 58.84±11.12 and 57.45±9.94, respectively. There was a positive significant association between the PCS and MCS with the WAI (p = 0.0001). Workers with higher education had a better work ability (p = 0.002) and shift-work workers had a worse work ability (p = 0.03). Conclusions Work ability of majority of women was moderate. Considering mean age of studied women (27.6 years old), this work ability is not satisfactory. Physical and mental components of the HRQoL were the important factors associated with work ability.
Źródło:
International Journal of Occupational Medicine and Environmental Health; 2016, 29, 1; 77-84
1232-1087
1896-494X
Pojawia się w:
International Journal of Occupational Medicine and Environmental Health
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Badania energochłonności procesu mielenia oraz podatności na rozdrabnianie składników litologicznych polskich rud miedzi
Investigation of grinding process energy consumption and grindability of lithologic components of Polish copper ores
Autorzy:
Tumidajski, T.
Kasińska-Pilut, E.
Gawenda, T.
Naziemiec, Z.
Pilut, R.
Powiązania:
https://bibliotekanauki.pl/articles/216175.pdf
Data publikacji:
2010
Wydawca:
Polska Akademia Nauk. Instytut Gospodarki Surowcami Mineralnymi i Energią PAN
Tematy:
energochłonność
proces rozdrabniania
typy litologiczne
polskie rudy miedzi
indeks pracy Bonda
energy consumption
comminution process
lithologic types
Polish copper ores
Bond work index
Opis:
Polskie rudy miedzi są mieszaniną trzech typów litologicznych: piaskowców, łupków i węglanów. Każdy z tych typów charakteryzuje się innymi wartościami właściwości fizykomechanicznych, co wpływa na ilość energii potrzebnej na ich rozdrobnienie. Dalszą konsekwencją tego faktu jest inny przebieg rozdrabniania rudy mającej różne udziały typów oraz konieczność stosowania innego układu operacji wzbogacania przy różnych przepływach materiału w strumieniach. Przykładowe rozwiązania linii technologicznych wzbogacających różne, pod względem składu litologicznego, mieszanki (tab.1) przedstawiono na rysunku 1. Ocenę zapotrzebowania na energię potrzebną do zmielenia nadawy przeprowadzono metodą wyznaczania indeksów pracy Bonda. Wyniki analiz przedstawiono w tabelach 2 i 3. Wykazują one różnice wskaźników w zależności od lokalizacji próbki w złożu (także czasu pobrania). Badania te będą kontynuowane. Omówiono także wstępnie program dalszych badań pozwalających lepiej charakteryzować pracę układu przygotowania nadawy do wzbogacania.
Polish copper ores are the mixtures of three lithologic types: sandstones, shales and carbonates. Each of them features by different values of physico-mechanical characteristics, what influences on amounts of energy required to their comminution. The further consequence of this fact is other course of comminution process of the ore having various lithologic types contents and necessity of application of the other beneficiation operations system by various material streams flows. The examples of solutions for technological systems beneficiating various mixtures taking into account lithologic composition were presented in table 1 and on fig. 1. The evaluation of energy demand needed to feed grinding process was conducted by themethod of Bond work indexes. The results of analyzes were shown in tables 2 and 3. They show the differences between factors in dependence on sample location in the deposit (also time of sampling). Furthermore, the program of further investigation was initially discussed, allowing to better characterize work of the system of feed preparation to beneficiation process. The research will be continued.
Źródło:
Gospodarka Surowcami Mineralnymi; 2010, 26, 1; 61-72
0860-0953
Pojawia się w:
Gospodarka Surowcami Mineralnymi
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Occupational and leisure time physical activity of territorial army soldiers during the COVID-19 pandemic in the context of their perceived work ability
Autorzy:
Grabara, Małgorzata
Sadowska-Krępa, Ewa
Powiązania:
https://bibliotekanauki.pl/articles/2084910.pdf
Data publikacji:
2022-06-08
Wydawca:
Instytut Medycyny Pracy im. prof. dra Jerzego Nofera w Łodzi
Tematy:
physical activity
energy expenditure
WHO recommendations
COVID-19 pandemic
Work Ability Index
Seven-Day Physical Activity Recall
Opis:
ObjectivesPhysical activity (PA) is important for the prevention and management of numerous diseases and may have a positive effect on ability to work. The study aimed to assess the level of occupational and leisure time PA of soldiers during the COVID-19 pandemic and to explore whether there was a relationship between PA and perceived work ability.Material and MethodsThe study involved 305 men and 68 women who were territorial army soldiers aged 18–55 (M±SD 32.9±9.01). The Seven-Day Physical Activity Recall (SDPAR) and the Work Ability Index (WAI) were used.ResultsThe level of self-reported PA for the studied soldiers was relatively high; 80% of them met the recommendations of the WHO and were characterized by having a good (60%) or excellent (20%) WAI status. The level of occupational PA of male soldiers was higher than the level of leisure time PA, and they indicated higher levels of occupational PA and leisure time PA during the workweek than the weekend.ConclusionsCurrent work ability in comparison to the best in life and work ability related to the physical requirements of the work were positively correlated with leisure time PA. Work ability related to physical requirements was also positively correlated with occupational and total PA, and work ability related to mental requirements was positively correlated with total PA. The study supports the relationship between PA and several aspects of work ability.
Źródło:
International Journal of Occupational Medicine and Environmental Health; 2022, 35, 3; 327-337
1232-1087
1896-494X
Pojawia się w:
International Journal of Occupational Medicine and Environmental Health
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of symptoms of climacteric syndrome, depression and insomnia on self-rated work ability in peri- and post-menopausal women in non-manual employment
Autorzy:
Humeniuk, E.
Bojar, I.
Gujski, M.
Raczkiewicz, D.
Powiązania:
https://bibliotekanauki.pl/articles/2085207.pdf
Data publikacji:
2019
Wydawca:
Instytut Medycyny Wsi
Tematy:
depression
insomnia
peri- and post-menopausal women
work ability index
Greene Climacteric Scale
Beck Depression Inventory
Athens Insomnia Scale
climacteric syndrome
Opis:
Objective. The aim of the study was evaluation of the relationship between severity of symptoms of climacteric syndrome, depressive disorders and sleep problems, and the self-rated work ability of peri-menopausal and post-menopausal women in non-manual employment. Materials and method. The study included 287 women aged 45–60 years, employed in various institutions as non-manual workers. Work Ability Index, Greene Climacteric Scale, Beck Depression Inventory, and Athens Insomnia Scale were used. Results. The examined peri-menopausal and post-menopausal women in non-manual employment obtained good work ability on the Work Ability Index. The severity of menopausal syndrome, according to the Greene Climacteric Scale, was moderate, placing the examined women between results for the general population of women and the pattern for menopausal women. Depressive disorders ranked between low mood and moderate depression. No depression was observed in 59% of the women, whereas moderate depression was observed in 39%, and severe depression in only 2%. Sleep disorders were on the border of normal range. As many as 46% of the women had no sleep problems, which was on the border of normal range in 36%. Only 19% of the examined women suffered from insomnia. Work ability correlated negatively with depression and insomnia severity, as well as with psychological and vasomotor symptoms of climacteric syndrome, but not to its somatic symptoms. Conclusions. Preventing the occurrence and treatment of menopausal symptoms, sleep and mood disorders may contribute to maintaining the work ability of women in peri- and post-menopausal age.
Źródło:
Annals of Agricultural and Environmental Medicine; 2019, 26, 4; 600-605
1232-1966
Pojawia się w:
Annals of Agricultural and Environmental Medicine
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Puti povyshenija effektivnosti revitalizacii promyshlennykh zdanijj
Ways to increase the efficiency of the industrial buildings revitalization
Autorzy:
Savjjovskijj, B.
Bronevickijj, A.
Karzhinerova, E.
Powiązania:
https://bibliotekanauki.pl/articles/77649.pdf
Data publikacji:
2015
Wydawca:
Komisja Motoryzacji i Energetyki Rolnictwa
Tematy:
industrial building
revitalization
repair work
technical index
economic index
construction work
effectiveness
construction cost
Źródło:
Motrol. Motoryzacja i Energetyka Rolnictwa; 2015, 17, 6
1730-8658
Pojawia się w:
Motrol. Motoryzacja i Energetyka Rolnictwa
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Dietary habits and myocardial infarction in occupationally active men
Autorzy:
Bortkiewicz, Alicja
Gadzicka, Elżbieta
Siedlecka, Jadwiga
Szyjkowska, Agata
Viebig, Piotr
Wranicz, Jerzy K.
Kurpesa, Małgorzata
Trzos, Ewa
Makowiec-Dąbrowska, Teresa
Powiązania:
https://bibliotekanauki.pl/articles/2161938.pdf
Data publikacji:
2019-11-15
Wydawca:
Instytut Medycyny Pracy im. prof. dra Jerzego Nofera w Łodzi
Tematy:
nutrition
food
acute myocardial infarction
physical work
mental work
body mass index
Opis:
Objectives Only a few studies have been undertaken to analyze the dietary habits of people with cardiovascular diseases. The aim of this study was to evaluate the dietary behaviors of working people who were hospitalized due to experiencing the first acute cardiovascular incident. Material and Methods In the study, the Functional Activity Questionnaire was used. The study was conducted in 2 groups. The first group included all the men hospitalized during 1 year (January–December 2009) in 2 clinics of cardiology, who were professionally active until the first myocardial infarction (MI). It comprised 243 men aged 26–70 years. The reference group consisted of 403 men, blue- and white-collar workers, aged 35–65 years. Results The body mass index of the MI patients was significantly higher (p = 0.006). The frequency of consumption of particular products in the MI group and in the reference group differed significantly for 11 of 21 products. The MI patients significantly less frequently reported the daily consumption of fruit, raw vegetables, cheese, vegetable oils and fish. In this group, the consumption of salty (p = 0.0226) or fatty (p < 0.0001) foods was significantly higher. It was shown that, after adjusting for age, education and the type of work, the daily consumption of fish, salads and cooked vegetables, as well as fruit and vegetable oils, significantly reduced the risk of myocardial infarction. An increased MI risk was, in turn, associated with obesity and preference for fatty foods. Conclusions The authors found that diet significantly modified the MI risk in the examined workers. This indicates that an important aspect of prevention activities among working people should involve education about proper dietary habits. Int J Occup Med Environ Health. 2019;32(6):853–63
Źródło:
International Journal of Occupational Medicine and Environmental Health; 2019, 32, 6; 853-863
1232-1087
1896-494X
Pojawia się w:
International Journal of Occupational Medicine and Environmental Health
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A proposition of the system of weights for aggregative indexes on the example ofthe index of work efficiency
Propozycja systemu wag dla indeksów agregatowych na przykładzie indeksu wydajności pracy
Autorzy:
Białek, Jacek
Czajkowski, Andrzej
Powiązania:
https://bibliotekanauki.pl/articles/906832.pdf
Data publikacji:
2008
Wydawca:
Uniwersytet Łódzki. Wydawnictwo Uniwersytetu Łódzkiego
Tematy:
aggregative index
arithmetic mean
harmonic mean
work efficiency
Opis:
In this paper we propose a construction of the aggregative index of work efficiency. The proposed system of weights is based on theoretical considerations over the situation in which the number of observations - coming from some of the considered enterprises - is insufficient. In the first part of this paper we consider a group of N - enterprises and two periods of their activity. We propose a construction of index to compare the periods taking into consideration the work efficiency. Next we consider the case when we intend to measure the average, one-period dynamics of the efficiency of work, having data from T>2 periods. We construct a new index which is a more general version of the previous index.
W pracy zaproponowano konstrukcję agregatowego indeksu wydajności pracy. Proponowany system wag wynika z teoretycznych rozważań nad sytuacją, gdy liczba obserwacji pochodzących od któregoś z analizowanych przedsiębiorstw jest niewystarczająca. W pierwszej części pracy rozważania dotyczą grupy N - przedsiębiorstw i dwóch okresów ich funkcjonowania. Podajemy konstrukcję indeksu dla porównania tych okresów z punktu widzenia wydajności pracy. Następnie rozważamy przypadek, gdy chcemy zmierzyć przeciętną, jedno-okresową dynamikę wydajności pracy posiadając dane pochodzące z T>2 okresów. Konstruujemy nowy indeks stanowiący ogólniejszą wersję poprzedniego indeksu.
Źródło:
Acta Universitatis Lodziensis. Folia Oeconomica; 2008, 216
0208-6018
2353-7663
Pojawia się w:
Acta Universitatis Lodziensis. Folia Oeconomica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Night shift work and modifiable lifestyle factors
Autorzy:
Pepłońska, Beata
Burdelak, Weronika
Krysicka, Jolanta
Bukowska, Agnieszka
Marcinkiewicz, Andrzej
Sobala, Wojciech
Klimecka-Muszyńska, Dorota
Rybacki, Marcin
Powiązania:
https://bibliotekanauki.pl/articles/2178877.pdf
Data publikacji:
2014-10-01
Wydawca:
Instytut Medycyny Pracy im. prof. dra Jerzego Nofera w Łodzi
Tematy:
night shift work
life style
physical activity
body mass index
Opis:
Objectives: Night shift work has been linked to some chronic diseases. Modification of lifestyle by night work may partially contribute to the development of these diseases, nevertheless, so far epidemiological evidence is limited. The aim of the study was to explore association between night shift work and lifestyle factors using data from a cross-sectional study among blue-collar workers employed in industrial plants in Łódź, Poland. Material and Methods: The anonymous questionnaire was self-administered among 605 employees (236 women and 369 men, aged 35 or more) - 434 individuals currently working night shifts. Distribution of the selected lifestyle related factors such as smoking, alcohol drinking, physical activity, body mass index (BMI), number of main meals and the hour of the last meal was compared between current, former, and never night shift workers. Adjusted ORs or predicted means were calculated, as a measure of the associations between night shift work and lifestyle factors, with age, marital status and education included in the models as covariates. Results: Recreational inactivity (defined here as less than one hour per week of recreational physical activity) was associated with current night shift work when compared to never night shift workers (OR = 2.43, 95% CI: 1.13-5.22) among men. Alcohol abstinence and later time of the last meal was associated with night shift work among women. Statistically significant positive relationship between night shift work duration and BMI was observed among men (p = 0.029). Conclusions: This study confirms previous studies reporting lower exercising among night shift workers and tendency to increase body weight. This finding provides important public health implication for the prevention of chronic diseases among night shift workers. Initiatives promoting physical activity addressed in particular to the night shift workers are recommended.
Źródło:
International Journal of Occupational Medicine and Environmental Health; 2014, 27, 5; 693-706
1232-1087
1896-494X
Pojawia się w:
International Journal of Occupational Medicine and Environmental Health
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analiza wypadków przy pracy i chorób zawodowych w zakładzie utrzymania ruchu stalowni
Autorzy:
Cichoń, Cz.
Szewczyk, P.
Powiązania:
https://bibliotekanauki.pl/articles/370725.pdf
Data publikacji:
2009
Wydawca:
Wyższa Szkoła Zarządzania Ochroną Pracy w Katowicach
Tematy:
wypadek przy pracy
choroba zawodowa
wskaźnik ciężkości
wskaźnik częstości
zarządzanie świadomością
accident at work
occupational disease
index of seriousness
frequency index
awareness management
Opis:
W artykule opisano analizę okoliczności i przyczyn wypadków przy pracy i chorób zawodowych w zakładzie utrzymania ruchu stalowni dużej firmy hutniczej. Na podstawie okoliczności i przyczyn 63 wypadków zaistniałych na przestrzeni siedmioletniej działalności zakładu wyodrębniono grupę przyczyn, które doprowadziły do zaistnienia większości zdarzeń. Określono także główne czynniki powodujące zapadanie pracowników zakładu na choroby zawodowe. Przedmiotowa analiza jest przykładem narzędzia, pozwalającego na podjęcie właściwych działań zapobiegawczych.
The paper contains analysis of the circumstances and causes of industrial accidents and occupational diseases in an activities maintenance plant of large steelworks. Taking into account circumstances and causes of 63 accidents which happened during a period of seven years a group of causes which lead to the arising of most of the events was marked out. Main factors causing occupational diseases of the plant workers were determined. The subject analysis is an example of a tool which may assist in taking appropriate preventive actions.
Źródło:
Zeszyty Naukowe Wyższej Szkoły Zarządzania Ochroną Pracy w Katowicach; 2009, 1(5); 81-93
1895-3794
2300-0376
Pojawia się w:
Zeszyty Naukowe Wyższej Szkoły Zarządzania Ochroną Pracy w Katowicach
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Analysis of the Regional Dimension of Human Development in Ukraine
Autorzy:
Kuzyshyn, Andriy
Poplavska, Inna
Powiązania:
https://bibliotekanauki.pl/articles/438544.pdf
Data publikacji:
2017
Wydawca:
Uniwersytet Pedagogiczny im. Komisji Edukacji Narodowej w Krakowie
Tematy:
life;
decent work;
education;
Human Development Index;
provincial regions of Ukraine;
socio-economic development;
welfare
Opis:
The article is devoted to important issue of modern regional analysis of Ukraine, i.e. peculiarities of regional development formation. All provincial regions of Ukraine were chosen for this analysis. The aim of the study was to determine trends of regional indicators during the period 2012–2015. The social component of sustainability reflects the quality of life and it is focused on preserving the stability of the social and cultural systems, in particular on reducing the number of destructive conflicts between people. The basis of our study was the method of the Human Development Index rating in 2015, conducted by the State Statistics Service of Ukraine and the Institute of Demography and Social Studies named after M.V. Pukhta, but with a reduction of performance indicators to four groups (comfortable life, prosperity, decent work, education). The results of our grouping allow for developing a number of measures to respond to current trends and adjust them depending on the situation. Areas with consistently high rates of human development dimension should extend its positive experience to other regional areas of Ukraine. A significant list of areas with average dimension of human development confirms the generally known trend that these areas do not conduct systematic improvement policy and optimal use of all components that can affect the standard of living. The list of regions, which are lagging behind includes regions that theoretically exhibit a powerful economic development which is however not reflected on the general welfare of the people in these regions.
Źródło:
Prace Komisji Geografii Przemysłu Polskiego Towarzystwa Geograficznego; 2017, 31, 2; 111-119
2080-1653
Pojawia się w:
Prace Komisji Geografii Przemysłu Polskiego Towarzystwa Geograficznego
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Comparison of farmers workload by manual and mechanical tasks on family farms
Autorzy:
Groborz, A.
Juliszewski, T.
Powiązania:
https://bibliotekanauki.pl/articles/52157.pdf
Data publikacji:
2013
Wydawca:
Instytut Medycyny Wsi
Tematy:
comparison
farmer workload
workload
work mechanization
heart rate reserve index
manual task
mechanical task
family farm
Opis:
The aim of this study was to compare the workload between tasks undertaken manually and those with the assistance of mechanical devices. The results indicate that the workload during the tasks assisted by mechanisation was usually very low or relatively low. Statistical analysis showed the impact of the way of the work performance on the workload. However, the results also indicate that the workload is not evenly distributed: the effort relating to the working tasks is larger in relation to the work of women than men. The need for mechanisation of the tasks performed by women is higher than that for the mechanisation of tasks performed by men. The type of work performance (manual, or technically assisted) did not clearly show significant differences in the workload. This surprising result indicates that the technical devices used on many farms are still far from perfect. It is concluded that assisting work with mechanical devices reduces the workload of farmers, but the way of work performance (manual or mechanical) was not statistically significant.
Źródło:
Annals of Agricultural and Environmental Medicine; 2013, 20, 2
1232-1966
Pojawia się w:
Annals of Agricultural and Environmental Medicine
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The analysis of the usability of selected stationary load cycles for the assessment of the tractor engine economy
Analiza przydatnosci wybranych stacjonarnych cykli obciazen dla oceny ekonomicznosci silnikow ciagnikow
Autorzy:
Sedlak, P.
Janicki, W.
Matuszak, K.
Powiązania:
https://bibliotekanauki.pl/articles/793679.pdf
Data publikacji:
2012
Wydawca:
Komisja Motoryzacji i Energetyki Rolnictwa
Tematy:
combustion engine
operating index
engine
road vehicle
engine speed
fuel consumption
engine work cycle
tractor engine
stationary load cycle
Źródło:
Teka Komisji Motoryzacji i Energetyki Rolnictwa; 2012, 12, 1
1641-7739
Pojawia się w:
Teka Komisji Motoryzacji i Energetyki Rolnictwa
Dostawca treści:
Biblioteka Nauki
Artykuł
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