When shovels load the dump trucks with over 100-ton passes under gravity dumping conditions, they will create a large impact force on the dump truck body which generates high frequency shock waves which expose the ope...When shovels load the dump trucks with over 100-ton passes under gravity dumping conditions, they will create a large impact force on the dump truck body which generates high frequency shock waves which expose the operators to whole body vibrations （WBV）. The main cause of such truck vibrations is the large impact force due to the gravity dumping of large tonnage passes. Therefore a rigorous mathematical model has been developed for the impact force containing all the necessary factors upon which it depends. Latter, a thorough analysis shows that percentage reduction of 7.19%, 9.40%, 13.27%, 14.8%, 17.30% and 18.13% can he achieved by reducing the dumping distance to 6.33 m, 6.0 m, 5.5 m, 5.33 m, 5.0 m and 4.9 m, respectively, as compared to when the dumping distance was 7.33 m. Even more reduction in the magnitude of impact force can he observed if the shovel pass gets divided into more than two sub-passes. Therefore, these models can he used to figure out the number of sub-passes into which a single ore pass can he divided and/or the extent to which the dumping distance can he reduced which would reduce the impact force significantly enough to obtain safer yet economic operations.展开更多
Petrochemical storage tanks are generally inspected when the tank is offline mostly to assess the extent of underside corrosion on the tank floor. Emptying, cleaning and opening a tank for inspection take many months ...Petrochemical storage tanks are generally inspected when the tank is offline mostly to assess the extent of underside corrosion on the tank floor. Emptying, cleaning and opening a tank for inspection take many months and are very expensive. Inspection costs can be reduced significantly by inserting robots through manholes on the tank roof to pertbrm non-destructive testing （NDT）. The challenge is to develop robots that can operate safely in explosive and hazardous environments and measure the thickness of floor plates using ultrasound sensors. This paper reports on the development of a small and inexpensive prototype robot （NDTBOT） which is designed to be intrinsically safe for zone zero operation. The robot ＂hops＂ across the floor to make measurements, without any external moving parts. The paper describes the design, experimental testing of the NDTBOT and presents results of steel plate thickness measurements made under water.展开更多
Objective:Individuals travel locally and internationally in order to find alternative treatments which are less-toxic and more beneficial to their health and wellness.Despite the popularity of the western system of me...Objective:Individuals travel locally and internationally in order to find alternative treatments which are less-toxic and more beneficial to their health and wellness.Despite the popularity of the western system of medicine,cupping therapies are gaining enormous attention in Pakistan as a system of traditional and complementary medicine to ensure the quality of life and wellness notions of the people.The present study aims to examine the effectiveness of dry cupping therapy(DCT)on the health,wellness,and quality of life preferences of health-seeking travelers in a sample of Faisalabad.Methods:DCT was performed for 15-20 minutes on subjects by using 3-5 disposable cupping glasses.Study participants filled the questionnaires before and after DCT interventions.Partial least square structural equation modeling technique is used in order to statistically analyze the data.Results:A total of 187 subjects participated in two DCT interventions at Coural Wellness Center Faisalabad and provided their final responses after 30 days from 2nd DCT.Respondents’perceptions of their physical feelings were generally found in a significantly positive and direct relation with DCT and health status(HS),i.e.,body pain(β=0.019),vitality(β=0.138),and bodily movement(β=0.207).This trend was observed in the psychological feelings of respondents as well,i.e.,emotional feelings(β=0.169).DCT significantly mediated the overall phenomenon and variance account for values were found between 20%and 80%for all the study constructs.The scores of all the health and wellness items on the questionnaire were significantly improved in 79.68%of studied participants after 1st and 2nd DCT interventions except for social functioning.Conclusion:Findings of the present study suggest that DCT has an important role in determining the health perceptions and HS of health travelers without potential side-effects.It can improve the health and overall quality of life of the people by positively influencing their physical and psychological health perceptions.It additionally leads to improve travelers’emotion,behavior,and other daily matters.展开更多
Glycyrrhetic acid 3-O-mono-β-D-glucuronide （GAMG）, the major functional ingredient in licorice, has widespread applications in food, pharmacy and cosmetics industry. The production of GAMG through Penicillium purpu...Glycyrrhetic acid 3-O-mono-β-D-glucuronide （GAMG）, the major functional ingredient in licorice, has widespread applications in food, pharmacy and cosmetics industry. The production of GAMG through Penicillium purpurogenum Li-3 cultivation was for the first time performed through both batch and fed-batch processes in bioreactors. In batch process, under optimal conditions （pH 5.0, temperature 32℃, agitation speed 100 r. rain 1）, 3.55 g. L^-1 GAMG was obtained in a 2.5 L fermentor. To further enhance GAMG production, a fine fed-batch process was developed by using pH and DO as feedback parameters. Starting from 48 h, 100 m190 g-L 1 substrate Glycyrrhizin （GL） was fed each time when pH increased to above 5.0 and DO was increased to above 80%. This strategy can significantly enhance GAMG production： the achieved GL conversion was 95.34% with GAMG yield of 95.15%, and GAMG concentration was 16.62 g. L^-1 which was 5 times higher than that of batch. Then, a two-step separation strat- egy was established to separate GAMG from fermentation broth by crude extraction of 15 ml column packed with D10I resin followed by fine purification with preparative C18 chromatography. The obtained GAMG purity was 95.79%. This study provides a new insight into the industrial bioprocess of high-level GAMG production.展开更多
文摘When shovels load the dump trucks with over 100-ton passes under gravity dumping conditions, they will create a large impact force on the dump truck body which generates high frequency shock waves which expose the operators to whole body vibrations （WBV）. The main cause of such truck vibrations is the large impact force due to the gravity dumping of large tonnage passes. Therefore a rigorous mathematical model has been developed for the impact force containing all the necessary factors upon which it depends. Latter, a thorough analysis shows that percentage reduction of 7.19%, 9.40%, 13.27%, 14.8%, 17.30% and 18.13% can he achieved by reducing the dumping distance to 6.33 m, 6.0 m, 5.5 m, 5.33 m, 5.0 m and 4.9 m, respectively, as compared to when the dumping distance was 7.33 m. Even more reduction in the magnitude of impact force can he observed if the shovel pass gets divided into more than two sub-passes. Therefore, these models can he used to figure out the number of sub-passes into which a single ore pass can he divided and/or the extent to which the dumping distance can he reduced which would reduce the impact force significantly enough to obtain safer yet economic operations.
文摘Petrochemical storage tanks are generally inspected when the tank is offline mostly to assess the extent of underside corrosion on the tank floor. Emptying, cleaning and opening a tank for inspection take many months and are very expensive. Inspection costs can be reduced significantly by inserting robots through manholes on the tank roof to pertbrm non-destructive testing （NDT）. The challenge is to develop robots that can operate safely in explosive and hazardous environments and measure the thickness of floor plates using ultrasound sensors. This paper reports on the development of a small and inexpensive prototype robot （NDTBOT） which is designed to be intrinsically safe for zone zero operation. The robot ＂hops＂ across the floor to make measurements, without any external moving parts. The paper describes the design, experimental testing of the NDTBOT and presents results of steel plate thickness measurements made under water.
文摘Objective:Individuals travel locally and internationally in order to find alternative treatments which are less-toxic and more beneficial to their health and wellness.Despite the popularity of the western system of medicine,cupping therapies are gaining enormous attention in Pakistan as a system of traditional and complementary medicine to ensure the quality of life and wellness notions of the people.The present study aims to examine the effectiveness of dry cupping therapy(DCT)on the health,wellness,and quality of life preferences of health-seeking travelers in a sample of Faisalabad.Methods:DCT was performed for 15-20 minutes on subjects by using 3-5 disposable cupping glasses.Study participants filled the questionnaires before and after DCT interventions.Partial least square structural equation modeling technique is used in order to statistically analyze the data.Results:A total of 187 subjects participated in two DCT interventions at Coural Wellness Center Faisalabad and provided their final responses after 30 days from 2nd DCT.Respondents’perceptions of their physical feelings were generally found in a significantly positive and direct relation with DCT and health status(HS),i.e.,body pain(β=0.019),vitality(β=0.138),and bodily movement(β=0.207).This trend was observed in the psychological feelings of respondents as well,i.e.,emotional feelings(β=0.169).DCT significantly mediated the overall phenomenon and variance account for values were found between 20%and 80%for all the study constructs.The scores of all the health and wellness items on the questionnaire were significantly improved in 79.68%of studied participants after 1st and 2nd DCT interventions except for social functioning.Conclusion:Findings of the present study suggest that DCT has an important role in determining the health perceptions and HS of health travelers without potential side-effects.It can improve the health and overall quality of life of the people by positively influencing their physical and psychological health perceptions.It additionally leads to improve travelers’emotion,behavior,and other daily matters.
基金Supported by the National Natural Science Foundation of China(21176028 and21506011)the National Science Fund for Distinguished Young Scholars of China(21425624)Doctoral Fund of Ministry of Education of China(20121101110050)
文摘Glycyrrhetic acid 3-O-mono-β-D-glucuronide （GAMG）, the major functional ingredient in licorice, has widespread applications in food, pharmacy and cosmetics industry. The production of GAMG through Penicillium purpurogenum Li-3 cultivation was for the first time performed through both batch and fed-batch processes in bioreactors. In batch process, under optimal conditions （pH 5.0, temperature 32℃, agitation speed 100 r. rain 1）, 3.55 g. L^-1 GAMG was obtained in a 2.5 L fermentor. To further enhance GAMG production, a fine fed-batch process was developed by using pH and DO as feedback parameters. Starting from 48 h, 100 m190 g-L 1 substrate Glycyrrhizin （GL） was fed each time when pH increased to above 5.0 and DO was increased to above 80%. This strategy can significantly enhance GAMG production： the achieved GL conversion was 95.34% with GAMG yield of 95.15%, and GAMG concentration was 16.62 g. L^-1 which was 5 times higher than that of batch. Then, a two-step separation strat- egy was established to separate GAMG from fermentation broth by crude extraction of 15 ml column packed with D10I resin followed by fine purification with preparative C18 chromatography. The obtained GAMG purity was 95.79%. This study provides a new insight into the industrial bioprocess of high-level GAMG production.
