Two patients aged of 30 and 22(female in cases 1,and male in case 2) both complained of unilateral blurring of vision and scotoma within a week of being diagnosed with dengue fever.No other abnormal findings were foun...Two patients aged of 30 and 22(female in cases 1,and male in case 2) both complained of unilateral blurring of vision and scotoma within a week of being diagnosed with dengue fever.No other abnormal findings were found in their anterior segment.Retinal examination revealed blurring of the optic disc margin and several white spots in the posterior in both cases.Optical coherence tomography(OCT)imagery revealed that the white spots were only located in the retinal outer layers.Macular cystic foveolitis were also found in case 1 and diffused macular edema in case 2.In case 1,visual and retinal recovery were seen to resolve spontaneously.In case 2,patient had complete visual recovery two months after onset of the disease after being treated with steroids but central scotomata has continued to persist.展开更多
Taking green plum Industry in Luhe County of Shanwei City in Guangdong Province as an example,this paper made a precise positioning,based on the characteristics of rural tourism resources in Yongchuan Township,took th...Taking green plum Industry in Luhe County of Shanwei City in Guangdong Province as an example,this paper made a precise positioning,based on the characteristics of rural tourism resources in Yongchuan Township,took the current situation as the guide and improving the tourism function as the carrier,made an innovation of the rural tourism industry system,in order to improve the quality of rural tourism development,and realize the strategic goal of rural revitalization.展开更多
The impacts of elevation on fires in a ceiling vented compartment were investigated experimentally. The flame behavior of elevated fires was recorded. Various parameters including the fuel mass loss rate, the light ex...The impacts of elevation on fires in a ceiling vented compartment were investigated experimentally. The flame behavior of elevated fires was recorded. Various parameters including the fuel mass loss rate, the light extinction coefficient, the oxygen concentration and the gas temperature were measured. Results indicated that the variations of the flame behavior were consistent with that of the fuel mass loss rate. The fire location significantly impacted the light extinction coefficient, the oxygen concentration and the gas temperature, which all showed distinct stratification phenomena. For a higher elevated fire, the average fuel loss rate and the overall light extinction coefficient were smaller, the oxygen concentration was higher and the gas temperature was lower. In addition, the smoke descending was slower. From the perspective of those parameters the fire was less hazardous if the fire was elevated higher, which was totally different from the elevated fires in closed compartments.展开更多
At present,there is a shortage of experimental and simulation studies on fire spread in medium-and large-scale compartments while the existing models of the fire spread are limited for typical engineering applications...At present,there is a shortage of experimental and simulation studies on fire spread in medium-and large-scale compartments while the existing models of the fire spread are limited for typical engineering applications.This paper proposes a new model for large-scale fire spread on medium density fibreboard(MDF)panels.Validating the model with single burning item(SBI)experiments,it is found that the numerical simulation closely predicts the experimental heat release rate(HRR)with some error near the peak.The predicted heat flux and distance of lateral flame spread are consistent with the experiments and an existing model.The effects of kinetic properties and heat of combustion are identified through a sensitivity analysis.The decrease of activation energy and increase of pre-exponential factor make the MDF easier to pyrolyze and the increase of heat of combustion enhances the flame temperature and thus provide more heat feedback to the sample surface.The low activation energy(71.9 kJ/mol)and high heat of combustion(46.5 MJ/kg)of the model ensure the occurrence of flame spread.Furthermore,the model was validated using medium-scale compartment fire experiments and the results showed that the model can accurately predict the HRR after flashover(the error is within 7%).While the burner is ignited,the predictions of in-compartment gas temperature and heat flux are more accurate.However,when the burner is extinguished,the modelled in-compartment gas temperature is lower than the experimental values,resulting in a lower heat flux prediction.The model leads to easier flame spread;therefore,the modelled flame spreads faster in the compartment compared to the experiment,and thus the HRR increases more rapidly.展开更多
In order to provide a novel biomimetic composite substrate for tissue engineering and explore the interaction between cells and this type of material,we developed chitosan/liquid crystal(CS/LC)composite hydrogel with ...In order to provide a novel biomimetic composite substrate for tissue engineering and explore the interaction between cells and this type of material,we developed chitosan/liquid crystal(CS/LC)composite hydrogel with embedded LC phases by composing of cholesterol hydroxypropyl cellulose ester liquid crystalline material and CS.The micromorphology of CS/LC composite hydrogels exhibited‘islands-sea’phase separation structures similar to the‘fluid mosaic model’of biomembrane.In vitro cell compatibility study suggested that 3T3 is fibroblasts exhibited better initial cell adhesions and higher proliferation rates on the composite hydrogel than on the polystyrene control plate and the pure LC membrane.This novel CS/LC composite hydrogel provides more favorable interface for cell growth and proliferation and may serve as potentially active substrate for engineering interfaces to live cells.展开更多
基金supported by Guangzhou Medicine and Health Care Technology Projects,Guangdong Province,China(No.20141A011100)
文摘Two patients aged of 30 and 22(female in cases 1,and male in case 2) both complained of unilateral blurring of vision and scotoma within a week of being diagnosed with dengue fever.No other abnormal findings were found in their anterior segment.Retinal examination revealed blurring of the optic disc margin and several white spots in the posterior in both cases.Optical coherence tomography(OCT)imagery revealed that the white spots were only located in the retinal outer layers.Macular cystic foveolitis were also found in case 1 and diffused macular edema in case 2.In case 1,visual and retinal recovery were seen to resolve spontaneously.In case 2,patient had complete visual recovery two months after onset of the disease after being treated with steroids but central scotomata has continued to persist.
基金Supported by Guangdong Students’Platform for Innovation and Entrepreneurship Training Program"Discussion of the Long-term Mechanism of Industrial Poverty Alleviation from the Perspective of Industrial Value Chain:Taking Green Plum Township of Luhe County as an Example"(S202113714021X)。
文摘Taking green plum Industry in Luhe County of Shanwei City in Guangdong Province as an example,this paper made a precise positioning,based on the characteristics of rural tourism resources in Yongchuan Township,took the current situation as the guide and improving the tourism function as the carrier,made an innovation of the rural tourism industry system,in order to improve the quality of rural tourism development,and realize the strategic goal of rural revitalization.
基金supported by National Natural Science Foundation of China (Project no. 50976109 and no. 51206157)the Research Fund for the Doctoral Program of Higher Education of China (Grant no. 20123402110048)a Grant from CityU (Project No. 7002577)
文摘The impacts of elevation on fires in a ceiling vented compartment were investigated experimentally. The flame behavior of elevated fires was recorded. Various parameters including the fuel mass loss rate, the light extinction coefficient, the oxygen concentration and the gas temperature were measured. Results indicated that the variations of the flame behavior were consistent with that of the fuel mass loss rate. The fire location significantly impacted the light extinction coefficient, the oxygen concentration and the gas temperature, which all showed distinct stratification phenomena. For a higher elevated fire, the average fuel loss rate and the overall light extinction coefficient were smaller, the oxygen concentration was higher and the gas temperature was lower. In addition, the smoke descending was slower. From the perspective of those parameters the fire was less hazardous if the fire was elevated higher, which was totally different from the elevated fires in closed compartments.
基金This work was supported by the National Key Research&Development(R&D)Plan of China under(No.2020YFC 1522800)the National Natural Science Foundation of China(NSFC)(No.51876148)the Science and Technology Project of State Grid Anhui Electric Corporation of China(No.52120518001S).
文摘At present,there is a shortage of experimental and simulation studies on fire spread in medium-and large-scale compartments while the existing models of the fire spread are limited for typical engineering applications.This paper proposes a new model for large-scale fire spread on medium density fibreboard(MDF)panels.Validating the model with single burning item(SBI)experiments,it is found that the numerical simulation closely predicts the experimental heat release rate(HRR)with some error near the peak.The predicted heat flux and distance of lateral flame spread are consistent with the experiments and an existing model.The effects of kinetic properties and heat of combustion are identified through a sensitivity analysis.The decrease of activation energy and increase of pre-exponential factor make the MDF easier to pyrolyze and the increase of heat of combustion enhances the flame temperature and thus provide more heat feedback to the sample surface.The low activation energy(71.9 kJ/mol)and high heat of combustion(46.5 MJ/kg)of the model ensure the occurrence of flame spread.Furthermore,the model was validated using medium-scale compartment fire experiments and the results showed that the model can accurately predict the HRR after flashover(the error is within 7%).While the burner is ignited,the predictions of in-compartment gas temperature and heat flux are more accurate.However,when the burner is extinguished,the modelled in-compartment gas temperature is lower than the experimental values,resulting in a lower heat flux prediction.The model leads to easier flame spread;therefore,the modelled flame spreads faster in the compartment compared to the experiment,and thus the HRR increases more rapidly.
基金This work was supported by the Fundamental Research Funds for the Central Universities(21615436)the Science and Technology Program of Guangzhou,China(201508020035)the Science and Technology Program of Guangdong,China(2016B090913004).
文摘In order to provide a novel biomimetic composite substrate for tissue engineering and explore the interaction between cells and this type of material,we developed chitosan/liquid crystal(CS/LC)composite hydrogel with embedded LC phases by composing of cholesterol hydroxypropyl cellulose ester liquid crystalline material and CS.The micromorphology of CS/LC composite hydrogels exhibited‘islands-sea’phase separation structures similar to the‘fluid mosaic model’of biomembrane.In vitro cell compatibility study suggested that 3T3 is fibroblasts exhibited better initial cell adhesions and higher proliferation rates on the composite hydrogel than on the polystyrene control plate and the pure LC membrane.This novel CS/LC composite hydrogel provides more favorable interface for cell growth and proliferation and may serve as potentially active substrate for engineering interfaces to live cells.
