The Experts below are selected from a list of 267 Experts worldwide ranked by ideXlab platform
Qian Wang - One of the best experts on this subject based on the ideXlab platform.
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correlations of smoking with Cumulative Total dust exposure and Cumulative abnormal rate of pulmonary function in coal mine workers
Experimental and Therapeutic Medicine, 2016Co-Authors: Qingzeng Qian, Fu-hai Shen, Qian WangAbstract:: The present study aimed to investigate the correlation of smoking with Cumulative Total dust exposure (CTE) and Cumulative abnormal rate of pulmonary function in coal-mine workers. A Total of 376 coal-mine workers were recruited as the observational group, while 179 healthy workers in other industries were selected as the control group. All the workers underwent pulmonary function testing to determine their forced vital capacity (FVC), forced expiratory volume in 1 second (FEV1) and FEV1/FVC, in order to compare the abnormal pulmonary function between the two groups. A markedly higher number of smokers was observed in the observational group (200/376, 53.19%) when compared with the control group (72/179, 40.22%). In smokers, the abnormal rate of pulmonary function in the observational group (102/200, 51.00%) was evidently higher compared with that in the control group (19/72, 26.39%), whereas no significant difference was detected between the two groups of non-smokers (P=0.077). In addition, FVC, FEV1 and FEV1/FVC of the observational group were found to be lower compared with those in the control group, in both the smoking and non-smoking subgroups. In the smoking subgroup, FVC and FEV1 in subjects working at the coal mine for different number of years showed significant differences (all P 0.05). Furthermore, FVC, FEV1 and FEV1/FVC in smoking coal-mine workers were negatively correlated with the dust-exposure working duration (P<0.05). CTE was also positively correlated with Cumulative abnormal rate of pulmonary function in the smoking and non-smoking subgroups, while FEV1 was negatively correlated with CTE in the smoking subgroup (P=0.009). In conclusion, smoking is an important risk factor for the damage of pulmonary function in coal-mine workers, and it is positively correlated with dust-exposure time and CTE in these individuals.
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Correlations of smoking with Cumulative Total dust exposure and Cumulative abnormal rate of pulmonary function in coal-mine workers.
Experimental and Therapeutic Medicine, 2016Co-Authors: Qingzeng Qian, Fu-hai Shen, Qian WangAbstract:: The present study aimed to investigate the correlation of smoking with Cumulative Total dust exposure (CTE) and Cumulative abnormal rate of pulmonary function in coal-mine workers. A Total of 376 coal-mine workers were recruited as the observational group, while 179 healthy workers in other industries were selected as the control group. All the workers underwent pulmonary function testing to determine their forced vital capacity (FVC), forced expiratory volume in 1 second (FEV1) and FEV1/FVC, in order to compare the abnormal pulmonary function between the two groups. A markedly higher number of smokers was observed in the observational group (200/376, 53.19%) when compared with the control group (72/179, 40.22%). In smokers, the abnormal rate of pulmonary function in the observational group (102/200, 51.00%) was evidently higher compared with that in the control group (19/72, 26.39%), whereas no significant difference was detected between the two groups of non-smokers (P=0.077). In addition, FVC, FEV1 and FEV1/FVC of the observational group were found to be lower compared with those in the control group, in both the smoking and non-smoking subgroups. In the smoking subgroup, FVC and FEV1 in subjects working at the coal mine for different number of years showed significant differences (all P 0.05). Furthermore, FVC, FEV1 and FEV1/FVC in smoking coal-mine workers were negatively correlated with the dust-exposure working duration (P
Amir Bijan Yasrebi - One of the best experts on this subject based on the ideXlab platform.
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application of present value volume pv v and npv Cumulative Total ore npv cto fractal modelling for mining strategy selection
Resources Policy, 2017Co-Authors: Amir Bijan Yasrebi, Ardeshir Hezarkhani, Peyman AfzalAbstract:Abstract Open pit mine planning and determination of mining orientation are a critically important part of a mine opening to its closure. However, an optimal extraction sequences (OES) is identified when an NPV Cumulative trend becomes steady. This is controlled manually, typically from a nested pit shell methodology based on the experience which can lead to suboptimal results. Given this problem, a mathematical method to provide an analytical practice, which intends to prevent manual identification of an OES seems to be inevitable. The aim of this study is to propose Present Value-Volume (PV-V) and NPV-Cumulative Total Ore (NPV-CTO) fractal models to identify an accurate excavation orientation as well as an OES with respect to economic principals and ore grades. This has been conducted to achieve an earlier pay-back period and highest Cumulative NPV in Kahang Cu-Mo porphyry deposit, central Iran. Results derived via the PV-V fractal modelling indicate an accurate mining orientation with an N-S trend. Thus, pit sequence No. 92 was selected as the closure of the open pit mining for the Kahang deposit. Consequently, the NPV-CTO fractal model provides an analytical tool which can be used for determination of an OES for an open pit mine.
Bobby Antony - One of the best experts on this subject based on the ideXlab platform.
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calculated Total cross sections of electron impact ionization and excitations in tetrahedral xy 4 and sf 6 molecules 6 pages
Physical Review A, 2004Co-Authors: K N Joshipura, Minaxi Vinodkumar, Chetan Limbachiya, Bobby AntonyAbstract:Various Total cross sections for collisions of electrons in the energy range 10-2000 eV are calculated for the tetrahedral CH{sub 4}, SiH{sub 4}, GeH{sub 4}, CF{sub 4}, SiF{sub 4}, and CCl{sub 4} targets and SF{sub 6}. Molecular Total inelastic cross sections determined in the complex potential formalism are partitioned to account for the ionization and Cumulative electronic-excitation channels. The present Total cross sections and Total ionization cross sections are found to be consistent with the previous data. The Cumulative Total excitation cross sections reported here indicate the relative importance of ionization together with electronic excitation channels including neutral dissociation of these molecules by electron impact.
Steven J. Lisco - One of the best experts on this subject based on the ideXlab platform.
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Cumulative Total effective whole body radiation dose in critically ill patients
Chest, 2013Co-Authors: Deborah J Rohner, Suzanne Bennett, Chandrasiri Samaratunga, Elizabeth S Jewell, Mary Gaskillshipley, Jeffrey Smith, Steven J. LiscoAbstract:Background Uncertainty exists about a safe dose limit to minimize radiation-induced cancer. Maximum occupational exposure is 20 mSv/y averaged over 5 years with no more than 50 mSv in any single year. Radiation exposure to the general population is less, but the average dose in the United States has doubled in the past 30 years, largely from medical radiation exposure. We hypothesized that patients in a mixed-use surgical ICU (SICU) approach or exceed this limit and that trauma patients were more likely to exceed 50 mSv because of frequent diagnostic imaging. Methods Patients admitted into 15 predesignated SICU beds in a level I trauma center during a 30-day consecutive period were prospectively observed. Effective dose was determined using Huda's method for all radiography, CT imaging, and fluoroscopic examinations. Univariate and multivariable linear regressions were used to analyze the relationships between observed values and outcomes. Results Five of 74 patients (6.8%) exceeded exposures of 50 mSv. Univariate analysis showed trauma designation, length of stay, number of CT scans, fluoroscopy minutes, and number of general radiographs were all associated with increased doses, leading to exceeding occupational exposure limits. In a multivariable analysis, only the number of CT scans and fluoroscopy minutes remained significantly associated with increased whole-body radiation dose. Conclusions Radiation levels frequently exceeded occupational exposure standards. CT imaging contributed the most exposure. Health-care providers must practice efficient stewardship of radiologic imaging in all critically ill and injured patients. Diagnostic benefit must always be weighed against the risk of Cumulative radiation dose.
Qingzeng Qian - One of the best experts on this subject based on the ideXlab platform.
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correlations of smoking with Cumulative Total dust exposure and Cumulative abnormal rate of pulmonary function in coal mine workers
Experimental and Therapeutic Medicine, 2016Co-Authors: Qingzeng Qian, Fu-hai Shen, Qian WangAbstract:: The present study aimed to investigate the correlation of smoking with Cumulative Total dust exposure (CTE) and Cumulative abnormal rate of pulmonary function in coal-mine workers. A Total of 376 coal-mine workers were recruited as the observational group, while 179 healthy workers in other industries were selected as the control group. All the workers underwent pulmonary function testing to determine their forced vital capacity (FVC), forced expiratory volume in 1 second (FEV1) and FEV1/FVC, in order to compare the abnormal pulmonary function between the two groups. A markedly higher number of smokers was observed in the observational group (200/376, 53.19%) when compared with the control group (72/179, 40.22%). In smokers, the abnormal rate of pulmonary function in the observational group (102/200, 51.00%) was evidently higher compared with that in the control group (19/72, 26.39%), whereas no significant difference was detected between the two groups of non-smokers (P=0.077). In addition, FVC, FEV1 and FEV1/FVC of the observational group were found to be lower compared with those in the control group, in both the smoking and non-smoking subgroups. In the smoking subgroup, FVC and FEV1 in subjects working at the coal mine for different number of years showed significant differences (all P 0.05). Furthermore, FVC, FEV1 and FEV1/FVC in smoking coal-mine workers were negatively correlated with the dust-exposure working duration (P<0.05). CTE was also positively correlated with Cumulative abnormal rate of pulmonary function in the smoking and non-smoking subgroups, while FEV1 was negatively correlated with CTE in the smoking subgroup (P=0.009). In conclusion, smoking is an important risk factor for the damage of pulmonary function in coal-mine workers, and it is positively correlated with dust-exposure time and CTE in these individuals.
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Correlations of smoking with Cumulative Total dust exposure and Cumulative abnormal rate of pulmonary function in coal-mine workers.
Experimental and Therapeutic Medicine, 2016Co-Authors: Qingzeng Qian, Fu-hai Shen, Qian WangAbstract:: The present study aimed to investigate the correlation of smoking with Cumulative Total dust exposure (CTE) and Cumulative abnormal rate of pulmonary function in coal-mine workers. A Total of 376 coal-mine workers were recruited as the observational group, while 179 healthy workers in other industries were selected as the control group. All the workers underwent pulmonary function testing to determine their forced vital capacity (FVC), forced expiratory volume in 1 second (FEV1) and FEV1/FVC, in order to compare the abnormal pulmonary function between the two groups. A markedly higher number of smokers was observed in the observational group (200/376, 53.19%) when compared with the control group (72/179, 40.22%). In smokers, the abnormal rate of pulmonary function in the observational group (102/200, 51.00%) was evidently higher compared with that in the control group (19/72, 26.39%), whereas no significant difference was detected between the two groups of non-smokers (P=0.077). In addition, FVC, FEV1 and FEV1/FVC of the observational group were found to be lower compared with those in the control group, in both the smoking and non-smoking subgroups. In the smoking subgroup, FVC and FEV1 in subjects working at the coal mine for different number of years showed significant differences (all P 0.05). Furthermore, FVC, FEV1 and FEV1/FVC in smoking coal-mine workers were negatively correlated with the dust-exposure working duration (P
