The patient is a 37-year-old male with a right anterior tibial mass for more than one year and a left anterior tibial mass for more than one month.There was a history of hyperthyroidism.Histopathology of the lesions s...The patient is a 37-year-old male with a right anterior tibial mass for more than one year and a left anterior tibial mass for more than one month.There was a history of hyperthyroidism.Histopathology of the lesions showed epidermal hyperkeratosis of the skin tissue,thickening of the spinous layer,extensive collagen fibrillation in the superficial dermis and reticular layer,and numerous linear and granular mucoprotein deposits in the lower and middle dermis.Blastocystis hominis was routinely detected in the stool.Diagnosis:1.Pretibial myxedema 2.intestinal parasitosis(Blastocystis hominis infection).展开更多
Wood products trade sector remains crucial for many countries’ economies. This is also for the Republic of Congo (RC) where wood is the second most exported natural resource. </span></span><span s...Wood products trade sector remains crucial for many countries’ economies. This is also for the Republic of Congo (RC) where wood is the second most exported natural resource. </span></span><span style="font-family:Verdana;"><span style="font-family:Verdana;"><span style="font-family:Verdana;">In this study</span></span></span><span style="font-family:Verdana;"><span style="font-family:Verdana;"><span style="font-family:Verdana;">, we aimed to determine the predominant wood products exported from the RC to China from 2007 to 2019, analyze the trends related to this trade, compare the quantities of wood products exported to China and other destinations, and determine the perspectives for the sustainable trade. The descriptive study using graphs and tables, non-parametric technique Kruskal-Wallis, pairwise comparisons, and SWOT analysis made up the methodological basis for this study. IBM SPSS Statistics 26 software supported data processing. The results showed </span></span></span><span style="font-family:Verdana;"><span style="font-family:Verdana;"><span style="font-family:Verdana;">that </span></span></span><span style="font-family:Verdana;"><span style="font-family:Verdana;"><span style="font-family:Verdana;">logs were mainly exported to China, 92.585% of the three major wood products quantity (Logs, Wet sawnwood, and Dried sawnwood). Volume distributions between products categories differ significantly (Sig. = 0.000 < α = 0.05). Besides, a significant volume (69.32%) was exported to China compared to the other destinations, and volume distributions between different destinations differ significantly (Sig. = 0.000 < α = 0.05). The SWOT analysis describes weaknesses, strengths, opportunities, and potential threats related to RC’ wood products trade sector. The prospects for sustainable trade in wood products between the RC and China lie in establishing a good governance in the timber sector, supporting the emergence of domestic operators, and improving the business climate.展开更多
AIM:To compare two different laparotomy methods for modeling rabbit VX2 hepatocarcinoma.METHODS:Thirty New Zealand rabbits were randomly divided into two groups:A and B.Group A was assigned a traditional laparotomy me...AIM:To compare two different laparotomy methods for modeling rabbit VX2 hepatocarcinoma.METHODS:Thirty New Zealand rabbits were randomly divided into two groups:A and B.Group A was assigned a traditional laparotomy method(embedding tumor fragments directly into the liver with tweezers).Group B was subjected to an improved laparotomy method(injection of tumor fragments into the liver through a 15 G syringe needle).The operation time, incision length, incision infection rate, and mortality rate were compared between the two groups after laparotomy.Magnetic resonance imaging(MRI) was performed to evaluate tumor formation rates and the characteristics of the tumors 2 wk after laparotomy.RESULTS:The mean operation times for the two groups(Group A vs Group B) were 23.2 ± 3.4 min vs 17.5 ± 2.9 min(P < 0.05); the incision length was 3.3 ± 0.5 cm vs 2.4 ± 0.6 cm(P < 0.05); and the mortality rate after 2 wk was 26.7% vs 0%(P < 0.05); all of these outcomes were significantly different between the two groups.The incision infection rates in the two groups were 6.7% vs 0%(P > 0.05), whichwere not significantly different.MRI performed after 2weeks showed that the tumor formation rates in the two groups were 90.9%vs 93.3%(P>0.05).These rates were not significantly different between the two groups.The celiac implantation rate and abdominal wall metastasis rate in the two groups were 36.4%vs 13.3%(P<0.05)and 27.2%vs 6.7%(P<0.05),respectively,which were significantly different between the two groups.CONCLUSION:The tumor formation rates were not significantly different between the two methods for modeling rabbit VX2 hepatocarcinoma.However,the improved method is recommended because it has certain advantages.展开更多
The effects of wheel speeds and high-pressure hydrogen treatment on phase evolution,microstructure,and magnetocaloric properties in La_(0.5)Pr_(0.5)Fe_(11.4)Si_(1.6)melt-spun ribbons are studied in this work.The resul...The effects of wheel speeds and high-pressure hydrogen treatment on phase evolution,microstructure,and magnetocaloric properties in La_(0.5)Pr_(0.5)Fe_(11.4)Si_(1.6)melt-spun ribbons are studied in this work.The results reveal that the increase of wheel speed is beneficial to the formation of cubic NaZn_(13)-type phase and the grain refinement.The optimized wheel speed for microstructural and magnetocaloric properties is 30 m/s.The largest entropy change of 18.1 J/kg·K at 190 K under a magnetic field change of 0 T-5 T is obtained in La_(0.5)Pr_(0.5)Fe_(11.4)Si_(1.6)ribbons melt-spun at 30 m/s.After a high-pressure hydrogen treatment of 50 MPa,the Curie temperature of the ribbons prepared at 30 m/s is adjusted to about 314 K and the large-ΔS_(M)of 17.9 J/kg·K under a magnetic field change of 0 T-5 T is achieved at room temperature with almost none hysteresis loss.The small thermal and magnetic hysteresis and the large-ΔS_(M)make the La_(0.5)Pr_(0.5)Fe_(11.4)Si_(1.6)hydride ribbons appropriate for magnetic refrigerant applications around room temperature.展开更多
A primary amine functionalized ordered mesoporous phenolic resin(NH2-MPR)was obtained by an evaporationinduced self-assembly method.The as-prepared NH2-MPR material possessed large surface area and ordered twodimensio...A primary amine functionalized ordered mesoporous phenolic resin(NH2-MPR)was obtained by an evaporationinduced self-assembly method.The as-prepared NH2-MPR material possessed large surface area and ordered twodimensional hexagonal mesoporous structure.Also,the amine groups were well-dispersed in the mesoporous channels.It can act as an efficient solid base to promote Knoevenagel condensation of various aldehydes with ethyl cyanoacetate in water with high conversion and selectivity.This excellent performance was attributed ordered mesopores and hydrophobic pore surface,which resulted in the decreased the interference of water solvent and the increased active sites accessibility.Noted that it was comparable with homogenous base catalysts in the water-medium Knoevenagel condensation reaction,and it can be reused for at least five times without significant reduction in the catalytic efficiency.展开更多
To realize the synergistic treatment of dairy cow manure solids and dairy cattle breeding sewage,this study produced phosphorus-modified hydrochar by dairy cow manure solids impregnated with potassium phosphate(K_(3)P...To realize the synergistic treatment of dairy cow manure solids and dairy cattle breeding sewage,this study produced phosphorus-modified hydrochar by dairy cow manure solids impregnated with potassium phosphate(K_(3)PO_(4)).And then,the adsorption characteristics of Cu(Ⅱ)and ammonium(NH_(4)^(+))in dairy cattle breeding sewage under different dosages and adsorption time conditions of modified hydrochar were explored.The results show that the specific surface area and total pore volume of the hydrochar were increased by phosphorus-modified.The adsorption amount of hydrochar per unit-mass decreased with the increase in the dosage.With the increase in the dosage,the adsorption capacity of Cu(Ⅱ)decreased from the initial 26.16 mg/g to 3.38 mg/g.The adsorption of Cu(Ⅱ)and NH_(4)^(+)in sewage by hydrochar was mainly chemical adsorption,which was mainly affected by chelation and ion exchange.This adsorption was more inclined to single-molecular layer adsorption.Both the pH values and the ionic strength influenced the competitive adsorption between Cu(Ⅱ)and NH_(4)^(+).The higher the pH value was,the greater the adsorption amount,and the stronger the adsorption capacity by hydrochar.Moreover,the increase in the ionic strength decreases the adsorption capacity of hydrochar.展开更多
The oil in the Jurassic Da'anzhai reservoirs in the Sichuan Basin is unconventional tight oil,which accumulated in or near source rocks,and did not experience extensive migration in a large-scale long distance.The...The oil in the Jurassic Da'anzhai reservoirs in the Sichuan Basin is unconventional tight oil,which accumulated in or near source rocks,and did not experience extensive migration in a large-scale long distance.The first submember,second submember and third submember of Da'anzhai Member are dominated by shell limestone which is widely and continuously distributed,and are typical near-source lacustrine shell limestone tight reservoirs.Complex lithology,multiple types of reservoir space and complicated pore structure are developed in these reservoirs.The effective reservoir space mainly includes micro-pores and micro-fractures with strong fabric selectivity.The petrophysics experiment reveals that the average connected matrix porosity of tight oil reservoir in Jurassic Da'anzhai Member is about 2.13%,lower than that of other tight oil reservoirs but higher than the average effective porosity(0.97%)from previous single alcohol-saturated method.According to production performance data,the Da'anzhai shell limestone reservoir is not a simple porous or fractured reservoir,but has complex porethroat-fracture association or storage-seepage mode.Because the development of fossil shells controls the development of micro-fractures,fluids are difficult to enter into but easy to escape from the reservoirs.Although the pore-throat is fine,the sorting is poor and the displacement pressure is high,the movable fluid saturation and mercury ejection efficiency of the reservoir in the Da'anzhai Member is only slightly lower than that of some storage-seepage modes,and higher than that of Oil-bearing Group 7 of Yanchang Formation in the Ordos Basin.The reservoir in the Da'anzhai Member is one of the few tight oil reservoirs with high natural productivity.The tight oil in the shell limestone of the Da'anzhai Member has great development potential,but its extensive and effective development also has some challenges,such as high seepage resistance of matrix and ineffective single development mode.The development mode of the Da'anzhai tight oil should draw lessons from the Bakken Formation in North America and Oil-bearing Gourp 7 of Yanchang Formation in the Ordos Basin,and thus,effective development technologies based on volume fracturing and fine operation for shell limestone tight oil in the Da'anzhai Member in Sichuan Basin are developed to realize the development of profit and scale.展开更多
文摘The patient is a 37-year-old male with a right anterior tibial mass for more than one year and a left anterior tibial mass for more than one month.There was a history of hyperthyroidism.Histopathology of the lesions showed epidermal hyperkeratosis of the skin tissue,thickening of the spinous layer,extensive collagen fibrillation in the superficial dermis and reticular layer,and numerous linear and granular mucoprotein deposits in the lower and middle dermis.Blastocystis hominis was routinely detected in the stool.Diagnosis:1.Pretibial myxedema 2.intestinal parasitosis(Blastocystis hominis infection).
文摘Wood products trade sector remains crucial for many countries’ economies. This is also for the Republic of Congo (RC) where wood is the second most exported natural resource. </span></span><span style="font-family:Verdana;"><span style="font-family:Verdana;"><span style="font-family:Verdana;">In this study</span></span></span><span style="font-family:Verdana;"><span style="font-family:Verdana;"><span style="font-family:Verdana;">, we aimed to determine the predominant wood products exported from the RC to China from 2007 to 2019, analyze the trends related to this trade, compare the quantities of wood products exported to China and other destinations, and determine the perspectives for the sustainable trade. The descriptive study using graphs and tables, non-parametric technique Kruskal-Wallis, pairwise comparisons, and SWOT analysis made up the methodological basis for this study. IBM SPSS Statistics 26 software supported data processing. The results showed </span></span></span><span style="font-family:Verdana;"><span style="font-family:Verdana;"><span style="font-family:Verdana;">that </span></span></span><span style="font-family:Verdana;"><span style="font-family:Verdana;"><span style="font-family:Verdana;">logs were mainly exported to China, 92.585% of the three major wood products quantity (Logs, Wet sawnwood, and Dried sawnwood). Volume distributions between products categories differ significantly (Sig. = 0.000 < α = 0.05). Besides, a significant volume (69.32%) was exported to China compared to the other destinations, and volume distributions between different destinations differ significantly (Sig. = 0.000 < α = 0.05). The SWOT analysis describes weaknesses, strengths, opportunities, and potential threats related to RC’ wood products trade sector. The prospects for sustainable trade in wood products between the RC and China lie in establishing a good governance in the timber sector, supporting the emergence of domestic operators, and improving the business climate.
基金Supported by Natural Science Foundation of Hunan Province,China,No.14JJ2034Project of the Development and Reform Commission of Hunan Province,China,No.2013-1199Project of the Science and Technology Department of Hunan Province,China,No.2014TT2017
文摘AIM:To compare two different laparotomy methods for modeling rabbit VX2 hepatocarcinoma.METHODS:Thirty New Zealand rabbits were randomly divided into two groups:A and B.Group A was assigned a traditional laparotomy method(embedding tumor fragments directly into the liver with tweezers).Group B was subjected to an improved laparotomy method(injection of tumor fragments into the liver through a 15 G syringe needle).The operation time, incision length, incision infection rate, and mortality rate were compared between the two groups after laparotomy.Magnetic resonance imaging(MRI) was performed to evaluate tumor formation rates and the characteristics of the tumors 2 wk after laparotomy.RESULTS:The mean operation times for the two groups(Group A vs Group B) were 23.2 ± 3.4 min vs 17.5 ± 2.9 min(P < 0.05); the incision length was 3.3 ± 0.5 cm vs 2.4 ± 0.6 cm(P < 0.05); and the mortality rate after 2 wk was 26.7% vs 0%(P < 0.05); all of these outcomes were significantly different between the two groups.The incision infection rates in the two groups were 6.7% vs 0%(P > 0.05), whichwere not significantly different.MRI performed after 2weeks showed that the tumor formation rates in the two groups were 90.9%vs 93.3%(P>0.05).These rates were not significantly different between the two groups.The celiac implantation rate and abdominal wall metastasis rate in the two groups were 36.4%vs 13.3%(P<0.05)and 27.2%vs 6.7%(P<0.05),respectively,which were significantly different between the two groups.CONCLUSION:The tumor formation rates were not significantly different between the two methods for modeling rabbit VX2 hepatocarcinoma.However,the improved method is recommended because it has certain advantages.
基金Project supported by the National Natural Science Foundation of China(Grant No.51771197)the Fund from the Chinese Academy of Sciences(Grant No.KJZD-EW-M05)the Liaoning Revitalization Talents Program,China(Grant No.XLYC1807122).
文摘The effects of wheel speeds and high-pressure hydrogen treatment on phase evolution,microstructure,and magnetocaloric properties in La_(0.5)Pr_(0.5)Fe_(11.4)Si_(1.6)melt-spun ribbons are studied in this work.The results reveal that the increase of wheel speed is beneficial to the formation of cubic NaZn_(13)-type phase and the grain refinement.The optimized wheel speed for microstructural and magnetocaloric properties is 30 m/s.The largest entropy change of 18.1 J/kg·K at 190 K under a magnetic field change of 0 T-5 T is obtained in La_(0.5)Pr_(0.5)Fe_(11.4)Si_(1.6)ribbons melt-spun at 30 m/s.After a high-pressure hydrogen treatment of 50 MPa,the Curie temperature of the ribbons prepared at 30 m/s is adjusted to about 314 K and the large-ΔS_(M)of 17.9 J/kg·K under a magnetic field change of 0 T-5 T is achieved at room temperature with almost none hysteresis loss.The small thermal and magnetic hysteresis and the large-ΔS_(M)make the La_(0.5)Pr_(0.5)Fe_(11.4)Si_(1.6)hydride ribbons appropriate for magnetic refrigerant applications around room temperature.
基金This work is supported by the National Natural Science Foundation of China(No.21677098)Shanghai government(Nos.19SG42,19520710700 and 18230742500)the Program for Professor of Special Appointment(Eastern Scholar)at Shanghai Institutions of Higher Learning(No.TP2016034).
文摘A primary amine functionalized ordered mesoporous phenolic resin(NH2-MPR)was obtained by an evaporationinduced self-assembly method.The as-prepared NH2-MPR material possessed large surface area and ordered twodimensional hexagonal mesoporous structure.Also,the amine groups were well-dispersed in the mesoporous channels.It can act as an efficient solid base to promote Knoevenagel condensation of various aldehydes with ethyl cyanoacetate in water with high conversion and selectivity.This excellent performance was attributed ordered mesopores and hydrophobic pore surface,which resulted in the decreased the interference of water solvent and the increased active sites accessibility.Noted that it was comparable with homogenous base catalysts in the water-medium Knoevenagel condensation reaction,and it can be reused for at least five times without significant reduction in the catalytic efficiency.
基金financially supported by the State Grid Corporation Science and Technology Project(Grant No.5400-202031205A-0-0-00)Research and application of rural comprehensive energy recycling technology based on biomass-power-heat coupling and National Dairy Industry and Technology System(CARS-36).
文摘To realize the synergistic treatment of dairy cow manure solids and dairy cattle breeding sewage,this study produced phosphorus-modified hydrochar by dairy cow manure solids impregnated with potassium phosphate(K_(3)PO_(4)).And then,the adsorption characteristics of Cu(Ⅱ)and ammonium(NH_(4)^(+))in dairy cattle breeding sewage under different dosages and adsorption time conditions of modified hydrochar were explored.The results show that the specific surface area and total pore volume of the hydrochar were increased by phosphorus-modified.The adsorption amount of hydrochar per unit-mass decreased with the increase in the dosage.With the increase in the dosage,the adsorption capacity of Cu(Ⅱ)decreased from the initial 26.16 mg/g to 3.38 mg/g.The adsorption of Cu(Ⅱ)and NH_(4)^(+)in sewage by hydrochar was mainly chemical adsorption,which was mainly affected by chelation and ion exchange.This adsorption was more inclined to single-molecular layer adsorption.Both the pH values and the ionic strength influenced the competitive adsorption between Cu(Ⅱ)and NH_(4)^(+).The higher the pH value was,the greater the adsorption amount,and the stronger the adsorption capacity by hydrochar.Moreover,the increase in the ionic strength decreases the adsorption capacity of hydrochar.
基金supported by the project of the PetroChina Research Institute of Petroleum Exploration and Development(2016yj01)the National Science and Technology Major Project of China(No.2016ZX05046-003).
文摘The oil in the Jurassic Da'anzhai reservoirs in the Sichuan Basin is unconventional tight oil,which accumulated in or near source rocks,and did not experience extensive migration in a large-scale long distance.The first submember,second submember and third submember of Da'anzhai Member are dominated by shell limestone which is widely and continuously distributed,and are typical near-source lacustrine shell limestone tight reservoirs.Complex lithology,multiple types of reservoir space and complicated pore structure are developed in these reservoirs.The effective reservoir space mainly includes micro-pores and micro-fractures with strong fabric selectivity.The petrophysics experiment reveals that the average connected matrix porosity of tight oil reservoir in Jurassic Da'anzhai Member is about 2.13%,lower than that of other tight oil reservoirs but higher than the average effective porosity(0.97%)from previous single alcohol-saturated method.According to production performance data,the Da'anzhai shell limestone reservoir is not a simple porous or fractured reservoir,but has complex porethroat-fracture association or storage-seepage mode.Because the development of fossil shells controls the development of micro-fractures,fluids are difficult to enter into but easy to escape from the reservoirs.Although the pore-throat is fine,the sorting is poor and the displacement pressure is high,the movable fluid saturation and mercury ejection efficiency of the reservoir in the Da'anzhai Member is only slightly lower than that of some storage-seepage modes,and higher than that of Oil-bearing Group 7 of Yanchang Formation in the Ordos Basin.The reservoir in the Da'anzhai Member is one of the few tight oil reservoirs with high natural productivity.The tight oil in the shell limestone of the Da'anzhai Member has great development potential,but its extensive and effective development also has some challenges,such as high seepage resistance of matrix and ineffective single development mode.The development mode of the Da'anzhai tight oil should draw lessons from the Bakken Formation in North America and Oil-bearing Gourp 7 of Yanchang Formation in the Ordos Basin,and thus,effective development technologies based on volume fracturing and fine operation for shell limestone tight oil in the Da'anzhai Member in Sichuan Basin are developed to realize the development of profit and scale.
