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Tytuł:
Contrasting foliar and soil nutrients responses to drought induced crown dieback in a Quercus brantii forest
Autorzy:
Hosseini, A.
Hosseini, S.M.
Powiązania:
https://bibliotekanauki.pl/articles/2130168.pdf
Data publikacji:
2022
Wydawca:
Polska Akademia Nauk. Instytut Dendrologii PAN
Tematy:
crown condition
drought
nutrients
persian oak forests
tree decline
Opis:
Evidence has shown that drought-induced crown dieback has significant interaction with soil-plant water and nutrients relationships, but there isn’t sufficient knowledge of the water and nutrients connections in declining Persian oak (Quercus brantii) trees. To investigate the relationships between crown dieback and leaf nutrients concentrations, leaf water content, soil nutrients concentrations and soil moisture, one of the dieback affected stands was selected. This stand was located in Shalam forested area in northern Ilam province, west of Iran. Persian oak trees were evaluated using a crown dieback classification and divided into four classes with four replicates based on the severity of crown dieback. Sampling from leaves of trees and soil was implemented randomly in four sides of tree crown in August. Trees with moderate to severe declining showed reduced leaf water content (WC) and reduced relative leaf water content (RWC). Leaf N and P concentration of declining trees was significantly (p-value <0.05) more than that of healthy trees. The leaf K concentration of declining trees was significantly (p-value <0.10) more than that of the healthy. The leaf N:P amounts of oak trees was statistically different among crown dieback classes. But no significant differences was observed between the healthy and declining trees in terms of soil N, P, K, Ca and Mg concentrations and soil moisture. It was concluded that drought has effects on the nutrients status in the leaves of Persian oak trees and their changing in the declining trees is for resistance to drought condition, improving water use efficiency and possibly performance of vital activities.
Źródło:
Dendrobiology; 2022, 87; 101-112
1641-1307
Pojawia się w:
Dendrobiology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Vulnerability assessment of Southern coastal areas of Iran to sea level rise: evaluation of climate change impact
Autorzy:
Goharnejad, H.
Shamsai, A.
Hosseini, S.A.
Powiązania:
https://bibliotekanauki.pl/articles/48331.pdf
Data publikacji:
2013
Wydawca:
Polska Akademia Nauk. Instytut Oceanologii PAN
Tematy:
climate change
sea level rise
coastal area
Iran
general circulation model
sea-level change
artificial intelligence
artificial neural network
hydrological model
Źródło:
Oceanologia; 2013, 55, 3
0078-3234
Pojawia się w:
Oceanologia
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Balance of cost, time, and quality related to construction projects regarding the reinforced concrete of underground structures using a meta-heuristic algorithm
Bilans kosztów, czasu i jakości w odniesieniu do projektów budowlanych dotyczących betonu zbrojonego w konstrukcjach podziemnych z wykorzystaniem algorytmu meta-heurystycznego
Autorzy:
Hosseini, S. A.
Akbarpour, A.
Ahmadi, H.
Aminnejad, B.
Powiązania:
https://bibliotekanauki.pl/articles/230342.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
konstrukcja podziemna
konstrukcja żelbetowa
zarządzanie projektem
bilans
koszt
czas
jakość
algorytm metaheurystyczny
algorytm genetyczny
underground structure
reinforced concrete structure
project management
balance
cost
time
quality
metaheuristic algorithm
genetic algorithm
Opis:
Underground spaces having features such as stability, resistance, and being undetected can play a key role in reducing vulnerability by relocating infrastructures and manpower. In recent years, the competitive business environment and limited resources have mostly focused on the importance of project management in order to achieve its objectives. In this research, in order to find the best balance among cost, time, and quality related to construction projects using reinforced concrete in underground structures, a multi-objective mathematical model is proposed. Several executive approaches have been considered for project activities and these approaches are analyzed via several factors. It is assumed that cost, time, and quality of activities in every defined approach can vary between compact and normal values, and the goal is to find the best execution for activities, achieving minimum cost and the maximum quality for the project. To solve the proposed multi-objective model, the genetic algorithm NSGA-II is used.
Pomysł stworzenia bezpiecznej przestrzeni ma na celu zmniejszenie lub wyeliminowanie skutków zniszczenia i promieniowania, ze względu na bombardowanie klasyczne lub jądrowe i inne ataki. W przypadku ataków lotniczych zwykle używa się bomb z ogromnym potencjałem wybuchu i siłą niszczycielską, a zatem zderzenie tych bomb z celami powstaje bardzo wysoki poziom energii kinetycznej. Ta energia kinetyczna rozchodzi się jako ciśnienie i ciepło w środowisku, co może zakłócić i zniszczyć cel. Czasem ochrona przed bombardowaniami w budynkach i obiektach jest zapewniona przez modernizację zapobiegającą bezpośredniemu uderzeniu. Odbywa się to w przypadku ważnych miejsc, takich jak stanowiska dowodzenia i kluczowe elementy infrastruktury. Jednakże, w innych przypadkach, jest to nieuzasadnione z ekonomicznego punktu widzenia, dlatego też zamiast tego często wykorzystuje się podziemne lub częściowo podziemne bezpieczne przestrzenie (Movahedinia [5]). Zarządzanie projektem to zorganizowany system służący do zarządzania zasobami, dzięki czemu projekt może być ukończony zgodnie z określoną wizją w zakresie jakości, czasu i kosztu (Burke [7]). Projekty budowlane, podobnie jak inne działania i projekty, posiadają swoje własne ograniczenia. W odniesieniu do zarządzania projektem, są to tradycyjnie ograniczenia zakresu, czasu i kosztu. Te trzy czynniki są również określane jako trójkąt zarządzania projektem, w którym każde ograniczenie określa jedną stronę trójkąta. Podobnie jak w geometrii, jeśli jedna strona ulegnie zmianie, inne strony również się zmieniają; w zarządzaniu projektem, zmiany jednego czynnika wpływają również na inne czynniki. Trójkąt zarządzania projektem można również stosować w relacjach czasu, kosztu i jakości (Clements i Gido [8]). Oznacza to, że każdy projekt posiada trzy ograniczenia, którymi są czas, koszt i zakres. Ogólnie rzecz biorąc, kwestia równoważenia kosztu, czasu i jakości jednocześnie stara się uwzględnić trzy ważne czynniki w zarządzaniu projektem. Łatwo zrozumieć, że kwestia ta ma charakter wieloczynnościowy i może być przedstawiana w postaci modeli o wielu celach (Shuquan i Kongguo [11]). Struktura takiego modelu zawiera wiele opcji dla każdego działania, a model próbuje wybrać te z minimalnym koszem i czasem oraz najwyższą maksymalną jakością, lecz w tym przypadku mamy do czynienia z równoważeniem selekcji, ponieważ wysoka jakość i szybkość mają swoją cenę, a wykonanie kosztownego projektu może nie być możliwe. Badanie to ma na celu modelowanie problemu równoważenia kosztu, czasu i jakości w formie problemu o wielu celach, a następnie jego rozwiązanie za pomocą meta-heurystycznych algorytmów.
Źródło:
Archives of Civil Engineering; 2017, 63, 4; 103-121
1230-2945
Pojawia się w:
Archives of Civil Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Flexoelectric and surface effects on a cracked piezoelectric nanobeam: Analytical resonant frequency response
Autorzy:
Bastanfar, M
Hosseini, S.A.H.
Sourki, R.
Khosravi, F.
Powiązania:
https://bibliotekanauki.pl/articles/140249.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
flexoelectricity
surface effects
imperfections
resonance frequency
nanobeam
Opis:
A nanoscale beam model containing defect under the piezoelectricity considering the surface effects and flexoelectricity is established on the framework of Euler-Bernoulli theory. The governing equations of motion and related boundary conditions are derived by using Hamilton’s principle. The imperfect nanobeam is modeled by dividing the beam into two separate parts that are connected by a rotational and a longitude spring at the defect location. Analytical results on the free vibration response of the imperfect piezoelectric nanobeam exhibit that the flexoelectricity and the surface effects are sensitive to the boundary conditions, defect position, and geometry of the nanobeam. Numerical results are provided to predict the mechanical behavior of a weakened piezoelectric nanobeam considering the flexoelectric and surface effects. It is also revealed that the voltage, defect severity, and piezoelectric material have a critical role on the resonance frequency. The work is envisaged to underline the influence of surface effects and flexoelectricity on the free vibration of a cracked piezoelectric nanobeam for diverse boundary conditions. It should be mentioned, despite our R. Sourkiprevious works, an important class of piezoelectric materials used nowadays and called piezoelectric ceramics is considered in the current study.
Źródło:
Archive of Mechanical Engineering; 2019, LXVI, 4; 417-437
0004-0738
Pojawia się w:
Archive of Mechanical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Removal of fine gangue minerals from Chador-malu iron concentrate using hydroseparator
Autorzy:
Tohry, A.
Dehghani, A.
Hosseini-Nasab, M.
Powiązania:
https://bibliotekanauki.pl/articles/109329.pdf
Data publikacji:
2017
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
Chador-malu plant
iron concentrates
silica
phosphorus
hydroseparator
Opis:
Phosphorus and silica are the main impurities of the Chador-malu iron ore which need to be reduced to the required values of 0.1 and 2%, respectively. The impurities in the final iron concentrate are mainly due to the presence of fine particles (less than 25 μm) of silica and apatite in the concentrates of magnetic separators and flotation circuits. In this study, the removal of very fine gangue minerals from iron concentrate of the Chador-malu processing plant was investigated using a laboratory hydroseparator. The laboratory-scale hydroseparator experiments were conducted under various operational conditions. The results showed that the silica and phosphorus contents of the flotation feed samples (less than 45 μm) decreased from 4.13% and 0.58% to 2.90 and 0.45%, respectively, while the iron grade increased from 59.5% to 63.5% by setting the effective parameters of the separator. The follow up flotation tests on the hydroseparator product resulted in an iron concentrate with silica and phosphorus contents of less than 2% and 0.04%, respectively. Moreover, its phosphorus content was reduced from 0.66% to 0.1% by desliming the final magnetic concentrate with hydroseparator. In this case, around 76% of phosphorus was removed.
Źródło:
Physicochemical Problems of Mineral Processing; 2017, 53, 1; 250-263
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A laboratory and field condition comparison of life table parameters of Aphis gossypii Glover (Hemiptera: Aphididae)
Autorzy:
Hosseini-Tabesh, B.
Sahragard, A.
Karimi-Malati, A.
Powiązania:
https://bibliotekanauki.pl/articles/66204.pdf
Data publikacji:
2015
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Opis:
Life table studies are essential tools for understanding population dynamics. The life table parameters of Aphis gossypii Glover (Hemiptera: Aphididae) feeding on the host plant, Hibiscus syriacus L. were studied under laboratory (25±1°C and relative humidity of 65±5% and a photoperiod of 16L : 8D h) and field conditions (23–43°C, and relative humidity of 27–95%). The data were analysed using the age-stage, two-sex life table theory. The life table studies were started with 50 and 40 nymphs in laboratory and field conditions, respectively. Under laboratory conditions, A. gossypii reared on H. syriacus had a higher survival rate, fecundity, and longevity than those reared under field conditions. When reared under field conditions, A. gossypii had a longer nymphal developmental time, shorter adult longevity, and lower fecundity than those reared under laboratory conditions. The intrinsic rate of increase (r), net reproductive rate (R0), and the finite rate of increase (λ) under laboratory conditions, were higher than those obtained under field conditions. Nevertheless, there were no significant differences in the mean generation time T (days) between field and laboratory conditions. In the present study, the results clearly showed that life table parameters of A. gossypii were significantly different under field and laboratory conditions. These results could help us to understand the A. gossypii population dynamics under field conditions. The results could also help us make better management decisions for economically important crops.
Źródło:
Journal of Plant Protection Research; 2015, 55, 1
1427-4345
Pojawia się w:
Journal of Plant Protection Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Synthesis, Characterization, and Application of Stabilized-Ni/Fe Bimetallic Nanoparticles for the Selective Elimination of Chlorate Impurity in Military Grade Ammonium Perchlorate
Autorzy:
Zarei, A. R.
Moloudi, A.
Hosseini, S. G.
Powiązania:
https://bibliotekanauki.pl/articles/951495.pdf
Data publikacji:
2017
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego
Tematy:
ammonium perchlorate
chlorate
selective elimination
stabilized-Ni/Fe bimetallic nanoparticles
solid propellants
Opis:
Ammonium perchlorate (AP) is used as the most common oxidizer in composite solid propellants. Control of chlorate impurity in military grade ammonium perchlorate is important, since it has an undesirable effect on the thermal decomposition of ammonium perchlorate. In this work stabilized Ni/Fe bimetallic nanoparticles (S-Ni/Fe NPs) were synthesized using the borohydride reduction method (BRM) in the presence of starch as a stabilizing agent, and they were characterized by field emission scanning electron microscopy (SEM), and their X-ray diffraction pattern (XRD). The results showed that the synthesized S-Ni/Fe bimetallic nanoparticles were spherical in shape and had nearly uniform distribution, with particle sizes of 20-50 nm. The prepared nanoparticles were then used for the selective elimination of chlorate impurity in ammonium perchlorate. The main factors controlling the elimination of chlorate, such as the initial pH of the solution, dosage of S-Fe/Ni NPs, initial chlorate and perchlorate concentrations, reaction temperature, and reaction time, were optimized by using an experimental design based on the Taguchi method. An L9 orthogonal array (L9-OA) was used to design experiments with four 4-level factors (34). Under the optimal conditions, i.e., pH 6.5, at 30 °C and a dosage of 50 mg S-Ni/Fe NPs, chlorate was eliminated with nearly 100% efficiency in 50 mL of a solution containing 2.0 μg·mL−1 and 100 μg·mL−1 of chlorate and perchlorate, respectively, without change in perchlorate concentration.
Źródło:
Central European Journal of Energetic Materials; 2017, 14, 1; 120-133
1733-7178
Pojawia się w:
Central European Journal of Energetic Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Differential gene expression in response to cold stress in Viola wittrockiana
Autorzy:
Deljou, A.
Hosseini-Vasoukolaei, M.
Goudarzi, S.
Falahatian, S.
Mirzaie-Asl, A.
Hosseini-Vasoukolaei, N.
Shad, M.A.A.
Powiązania:
https://bibliotekanauki.pl/articles/79988.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Źródło:
BioTechnologia. Journal of Biotechnology Computational Biology and Bionanotechnology; 2016, 97, 2
0860-7796
Pojawia się w:
BioTechnologia. Journal of Biotechnology Computational Biology and Bionanotechnology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Application of the DTM to Nonlinear Cases Arising in Fluid Flows with Variable Viscosity
Autorzy:
Barari, A.
Rahimi, M.
Hosseini, M.
Ibsen, L.
Powiązania:
https://bibliotekanauki.pl/articles/1419737.pdf
Data publikacji:
2012-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
47.35.Pq
42.65.Wi
Opis:
This paper employs the differential transformation method to investigate two nonlinear ordinary differential systems for plane coquette flow having variable viscosity and thermal conductivity. The concept of differential transformation is briefly introduced, and then differential transformation method is employed to derive solutions of nonlinear equation systems. The results of differential transformation method are compared with those ones obtained by Adomian decomposition method to verify the accuracy of proposed method. The results reveal that the differential transformation method can achieve suitable results in predicting the solution of such problems.
Źródło:
Acta Physica Polonica A; 2012, 122, 1; 96-102
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Preparation and biodistribution of [201Tl](III)vancomycin complex in normal rats
Autorzy:
Jalilian, A.
Hosseini, M.
Karimian, A.
Saddadi, F.
Sadeghi, M.
Powiązania:
https://bibliotekanauki.pl/articles/146167.pdf
Data publikacji:
2006
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
thallium-201
vancomycin
labeling
SPECT
radiopharmaceuticals
infection
Opis:
Thallium-201 (T1/2 = 3.04 days) in Tl+ form was converted to Tl3+ cation in presence of O3 in 6 M HCl controlled by RTLC/gel electrophoresis methods. The final evaporated activity was reacted with vancomycin (VAN) in water to yield [201Tl](III)VAN. The best results were obtained at room temperature in water after 30 min with a radiochemical yield > 99%, after mixing the reactants followed by SPE purification using Si Sep-Pak. The studies showed that thallic ion is mostly incorporated into vancomycin with a radiochemical purity of more than 98 š 1% by RTLC. A specific activity of about 4.14 x 1010 Bq/mmol was obtained. Radiochemical purity and stability of 201Tl-VAN in the preparation and in presence of human serum was determined up to 5.5 days. Biodistribution study of 201Tl(III)-vancomycin in normal rats was performed up to 52 h.
Źródło:
Nukleonika; 2006, 51, 4; 203-208
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Synthesis and Characterization of CuO Nanoparticles by the Chemical Liquid Deposition Method and Investigation of Its Catalytic Effect on the Thermal Decomposition of Ammonium Perchlorate
Autorzy:
Eslami, A.
Juibari, N. M.
Hosseini, S. G.
Abbasi, M.
Powiązania:
https://bibliotekanauki.pl/articles/358128.pdf
Data publikacji:
2017
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego
Tematy:
copper oxide nanoparticles
ex-situ growth
ammonium perchlorate
thermal decomposition
chemical liquid deposition
Opis:
Copper oxide nanoparticles have been synthesized by the chemical liquid deposition method and characterized by means of X-ray diffraction analysis (XRD), Fourier transform infrared spectroscopy (FT-IR) and scanning electron microscopy (SEM). The XRD and SEM results showed that the particle size was between 50 nm and 70 nm. Ammonium perchlorate (AP)-CuO nanostructures have been prepared by ex-situ mixing of AP and CuO nanoparticles, while AP/CuO nanocomposites have been obtained by in-situ growth of nano CuO on the surface of AP. The effect of the nanoparticles on the thermal decomposition of AP has been examined by differential scanning calorimetery (DSC) and thermogravimetric analysis (TGA) methods. The results showed that the ex-situ prepared nanoparticles had better catalytic activity than the in-situ prepared ones. The effect of the synthesized nanoparticles on the thermal decomposition of AP in experiments with a AP to CuO ratio of 98:2 was as follows: with the ex-situ prepared experiments, the decomposition temperature decreased from 428 °C to 348 °C and the heat released increased from 344 J·g−1 to 1432 J·g−1, while those with the in-situ prepared samples exhibited 341 °C and 1317 J·g−1, respectively.
Źródło:
Central European Journal of Energetic Materials; 2017, 14, 1; 152-168
1733-7178
Pojawia się w:
Central European Journal of Energetic Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Resistance of canola cultivars affect life table parameters of Nysius cymoides (Spinola) (Hemiptera: Lygaeidae)
Autorzy:
Mollashahi, M.
Sahragard, A.
Mohaghegh-Neyshabouri, J.
Hosseini, R.
Sabouri, H.
Powiązania:
https://bibliotekanauki.pl/articles/65933.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
plant resistance
canola
Brassica napus
plant cultivar
Nysius cymoides
Hemiptera
Lygaeidae
Opis:
A life table can be used as an important and appropriate tool to evaluate the susceptibility or resistance level of different host plant cultivars to insect pests. In the current study, we determined the suitability or inferiority of five different canola cultivars (Hayula420, Hayula401, Hayula50, Hayula60, RGS) to Nysius cymoides, under laboratory conditions. Data were analysed based on the age-stage, two-sex life table theory. Nysius cymoides which fed on Hayula420 had the longest nymphal period, while those which fed on Hayula50 had the shortest nymphal period. Developmental times (sum of incubation and nymphal periods) was longest for those which fe d on Hayula420 and the shortest for those which fed on Hayula50. The adult pre-oviposition period (APOP), total pre-oviposition period (TPOP), mean fecundity, and adult longevity of adults reared on different canola cultivars showed significant differences. The highest and lowest net reproductive rates (R0) were obtained for those which fed on Hayula420 (11.40 offspring per individual) and Hayula401 (5.47 offspring per individual), respectively. The highest value (0.0395 d–1) for the intrinsic rate of increase (r) was obtained for those which fed on Hayula 60 cultivar and the lowest value (0.0261 d–1) for those which fed on Hayula401 cultivar. The shortest and longest mean generation times (T) were obtained for those which fed on RGS and H401 cultivars, respectively. The lowest and highest values of life expectancy (exj) were obtained for those which fed on RGS and Hayula420 cultivars, respectively. The results showed that Hayula401 and RGS were not susceptible cultivars to N. cymoides. These cultivars showed higher resistance to N. cymoides, while Hayula60, Hayula420, and Hayula50 were found to be suitable cultivars but with lower resistance to N. cymoides, respectively.
Źródło:
Journal of Plant Protection Research; 2016, 56, 1
1427-4345
Pojawia się w:
Journal of Plant Protection Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Postural Loading Assessment in Assembly Workers of an Iranian Telecommunication Manufacturing Company
Autorzy:
Kamalinia, M.
Saraji, G. N.
Kee, D.
Hosseini, M.
Choobineh, A
Powiązania:
https://bibliotekanauki.pl/articles/91206.pdf
Data publikacji:
2013
Wydawca:
Centralny Instytut Ochrony Pracy
Tematy:
musculoskeletal disorders
postural loading
assembly workers
LUBA
choroby narządów ruchu
montaż i demontaż
pozycja przy pracy
prace montażowe
Opis:
Background. Changes in industries and work practices have coincided with work-related musculoskeletal disorders(MSDs). This study was conducted to determine the prevalence of MSDs and to assess postural loading in assembly workers of an Iranian telecommunication manufacturing company. Methods. Data were collected from 193 randomly selected workers in 4 units of the company. The Nordic musculoskeletal disorders questionnaire and the UBC ergonomic checklist were used as data collection tools. Loading on the upper body assessment(LUBA) was used to assess postural loading. Results. Lower back symptoms were the most prevalent problems among the workers (67.9%). LUBA showed that most assembly workers (94.3%) had experienced considerable and high postural loading (postural load index, PLI > 5). Regression analyses revealed that lighting, rotation, contact stress, repetition, gender and age were factors associated with symptoms. Conclusion. Work-related MSDs occurred at a high rate among workers. Postural loading requires consideration. Any ergonomic intervention should focus on eliminating ergonomic factors associated with symptoms.
Źródło:
International Journal of Occupational Safety and Ergonomics; 2013, 19, 2; 311-319
1080-3548
Pojawia się w:
International Journal of Occupational Safety and Ergonomics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Workstation Design in Carpet Hand-Weaving Operation : Guidelines for Prevention of Musculoskeletal Disorders
Autorzy:
Choobineh, A.
Lahmi, M.
Hosseini, M.
Shahnavaz, H.
Jazani, R. K.
Powiązania:
https://bibliotekanauki.pl/articles/89889.pdf
Data publikacji:
2004
Wydawca:
Centralny Instytut Ochrony Pracy
Tematy:
weaving workstation design
carpet hand-weaving operation
musculoskeletal problems
working posture
projektowanie miejsc pracy
pozycja przy pracy
ergonomia
choroby narządów ruchu
wytwarzanie wyrobów włókienniczych
zagrożenia zdrowia
czynniki ryzyka
fizjologia narządów ruchu
Opis:
Carpet weavers suffer from musculoskeletal problems mainly attributed to poor working postures. Their posture is mostly constrained by the design of workstations. This study was conducted to investigate the effects of 2 design parameters (weaving height and seat type) on postural variables and subjective experience, and to develop guidelines for workstation adjustments. At an experimental workstation, 30 professional weavers worked in 9 different conditions. Working posture and weavers’ perceptions were measured. It was shown that head, neck and shoulder postures were influenced by weaving height. Both design parameters influenced trunk and elbows postures. The determinant factor for weavers’ perception on the neck, shoulders and elbows was found to be weaving height, and on the back and knees it was seat type. Based on the results, the following guidelines were developed: (a) weaving height should be adjusted to 20 cm above elbow height; (b) a 10º forward-sloping high seat is to be used at weaving workstations.
Źródło:
International Journal of Occupational Safety and Ergonomics; 2004, 10, 4; 411-424
1080-3548
Pojawia się w:
International Journal of Occupational Safety and Ergonomics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Musculoskeletal Symptoms as Related to Ergonomic Factors in Iranian Hand-Woven Carpet Industry and General Guidelines for Workstation Design
Autorzy:
Choobineh, A.
Lahmi, M.
Shahnavaz, H.
Jazani, R. K.
Hosseini, M.
Powiązania:
https://bibliotekanauki.pl/articles/90070.pdf
Data publikacji:
2004
Wydawca:
Centralny Instytut Ochrony Pracy
Tematy:
MSDs in small-scale industries
posture assessment in carpet hand weaving operation
MSDs in industrially developing countries (IDCs)
weaving workstation design
zagrożenia zdrowia
wytwarzanie wyrobów włókienniczych
małe przedsiębiorstwo
kraje rozwijające się
projektowanie miejsc pracy
pozycja przy pracy
choroby narządów ruchu
fizjologia narządów ruchu
choroby mięśni
Opis:
Carpet weaving is a high risk occupation for developing musculoskeletal disorders (MSDs). The objectives of the present study, which was carried out in the Iranian hand-woven carpet industry, were determination of the prevalence of MSD symptoms, identification of major factors associated with MSD symptoms and development of guidelines for workstation design. 1,439 randomly selected weavers participated in this study. A questionnaire was used to collect data on MSD symptoms. The results revealed that the prevalence rates for symptoms in different body regions were high as compared to the general Iranian population (for neck, back and large joints, p < .0001). The results of multivariate analyses showed that major ergonomic factors associated with musculoskeletal symptoms were loom type, working posture, daily working time and seat type. Based on the results, some general guidelines for designing weaving workstations were developed. A prototype test showed that the new workstation was acceptable for subject tests and that it improved working posture.
Źródło:
International Journal of Occupational Safety and Ergonomics; 2004, 10, 2; 157-168
1080-3548
Pojawia się w:
International Journal of Occupational Safety and Ergonomics
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 17

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