The purpose of this study was to find out the type of relationship between VO2 max and percentage of body fat in male secondary school students. The research sample consisted of 30 male students studying at Al-Khawari...The purpose of this study was to find out the type of relationship between VO2 max and percentage of body fat in male secondary school students. The research sample consisted of 30 male students studying at Al-Khawarizmi High School in Tlemcen. Their average age was 16.56 ± 0.69. We based our research on books and scientific journals, site visits, and personal meeting. We used the descriptive approach. The test was carried out and the measurements were taken at the institution＇s yard and the doctor＇s office respectively. We used the running test for one mile to measure the maximum oxygen consumption. The skin folds were taken in three areas： the chest, abdomen and mid-thigh, to estimate the proportion of fat in the body. The results showed that the relationship between maximum oxygen consumption and body fat percentage was strongly reversed at a significant level of 0.01, with Pearson correlation coefficient -0.597.展开更多
Background A free running asthma screening test is usually used for screening exercise-induced bronchoconstriction.The total serum allergen IgE level can reveal the patient＇s atopy characteristics.Our study is to eva...Background A free running asthma screening test is usually used for screening exercise-induced bronchoconstriction.The total serum allergen IgE level can reveal the patient＇s atopy characteristics.Our study is to evaluate the diagnostic values of the combination of the two tests in asthmatic children and compare this new diagnostic method with the Intemational Study of Asthma and Allergies in Childhood （ISSAC） questionnaires and the bronchial provocation test,which are popular diagnostic tool for pediatric asthma.Methods A total of 773 school children were recruited in this study.The children＇s asthma was diagnosed by means of a combination of the free running asthma screening test and total serum allergen IgE level.The new diagnostic method value was assessed using receiver operating characteristic （ROC） curves and compared with other diagnostic tools such as ISSAC questionnaires and the bronchial provocation test.Results The AUC of this new diagnostic method was higher than 0.9.When the cut-off value of total serum allergen IgE level was ≥47 KU/L,the sensitivity and the specificity were 71.4％ and 85.1％,respectively,which were better than those of either the ISSAC questionnaires or bronchial provocation test.Conclusion The combination of the free running asthma screening test and total serum allergen IgE level may be an effective diagnostic tool for children＇s asthma.展开更多
The mathematic model of heating chamber for implementing the prediction of the annealing craft and improving the self adapting with the expansion of the new annealing furnace form, new annealing crafts and new kinds o...The mathematic model of heating chamber for implementing the prediction of the annealing craft and improving the self adapting with the expansion of the new annealing furnace form, new annealing crafts and new kinds of steel coil has been established. The model developed which including the temperature for gas in heating chamber and the heating cover is based on the characteristics of anneal craft and the situations of locale production run. Firstly, the characteristic of the heating cover which limits the temperature was considered. Secondly, the locale production run condition and dispatching condition were considered. Finally, combining with the models and the simulation system, the numerical simulation research of the anneal process for the high performance hydrogen bell-type annealer as well as the spot experiment test were carried out. The results obtained from the developed models, usually finished less than thirty seconds, are in fair agreement with the test values, such as the relative errors of annealing times were within ±5%, and the quality＇ of the annealed steels were guaranteed.展开更多
The scheme for China’s carbon emission trading market has been approved by the State Council,and released by the National Development and Reform Commission（NDRC）,according to Zhang Yong,Vice Chairman of the NDRC,at...The scheme for China’s carbon emission trading market has been approved by the State Council,and released by the National Development and Reform Commission（NDRC）,according to Zhang Yong,Vice Chairman of the NDRC,at a press briefi ng held on December 19,2017.展开更多
文摘The purpose of this study was to find out the type of relationship between VO2 max and percentage of body fat in male secondary school students. The research sample consisted of 30 male students studying at Al-Khawarizmi High School in Tlemcen. Their average age was 16.56 ± 0.69. We based our research on books and scientific journals, site visits, and personal meeting. We used the descriptive approach. The test was carried out and the measurements were taken at the institution＇s yard and the doctor＇s office respectively. We used the running test for one mile to measure the maximum oxygen consumption. The skin folds were taken in three areas： the chest, abdomen and mid-thigh, to estimate the proportion of fat in the body. The results showed that the relationship between maximum oxygen consumption and body fat percentage was strongly reversed at a significant level of 0.01, with Pearson correlation coefficient -0.597.
文摘Background A free running asthma screening test is usually used for screening exercise-induced bronchoconstriction.The total serum allergen IgE level can reveal the patient＇s atopy characteristics.Our study is to evaluate the diagnostic values of the combination of the two tests in asthmatic children and compare this new diagnostic method with the Intemational Study of Asthma and Allergies in Childhood （ISSAC） questionnaires and the bronchial provocation test,which are popular diagnostic tool for pediatric asthma.Methods A total of 773 school children were recruited in this study.The children＇s asthma was diagnosed by means of a combination of the free running asthma screening test and total serum allergen IgE level.The new diagnostic method value was assessed using receiver operating characteristic （ROC） curves and compared with other diagnostic tools such as ISSAC questionnaires and the bronchial provocation test.Results The AUC of this new diagnostic method was higher than 0.9.When the cut-off value of total serum allergen IgE level was ≥47 KU/L,the sensitivity and the specificity were 71.4％ and 85.1％,respectively,which were better than those of either the ISSAC questionnaires or bronchial provocation test.Conclusion The combination of the free running asthma screening test and total serum allergen IgE level may be an effective diagnostic tool for children＇s asthma.
文摘The mathematic model of heating chamber for implementing the prediction of the annealing craft and improving the self adapting with the expansion of the new annealing furnace form, new annealing crafts and new kinds of steel coil has been established. The model developed which including the temperature for gas in heating chamber and the heating cover is based on the characteristics of anneal craft and the situations of locale production run. Firstly, the characteristic of the heating cover which limits the temperature was considered. Secondly, the locale production run condition and dispatching condition were considered. Finally, combining with the models and the simulation system, the numerical simulation research of the anneal process for the high performance hydrogen bell-type annealer as well as the spot experiment test were carried out. The results obtained from the developed models, usually finished less than thirty seconds, are in fair agreement with the test values, such as the relative errors of annealing times were within ±5%, and the quality＇ of the annealed steels were guaranteed.
文摘The scheme for China’s carbon emission trading market has been approved by the State Council,and released by the National Development and Reform Commission（NDRC）,according to Zhang Yong,Vice Chairman of the NDRC,at a press briefi ng held on December 19,2017.
