Based on the characteristics of line structured light sensor, a speedy method for the calibration was established. With the coplanar reference target, the spacial pose between camera and optical plane can be calibrate...Based on the characteristics of line structured light sensor, a speedy method for the calibration was established. With the coplanar reference target, the spacial pose between camera and optical plane can be calibrated by using of the camera’s projective center and the light’s information in the camera’s image surface. Without striction to the movement of the coplanar reference target and assistant adjustment equipment, this calibration method can be implemented. This method has been used and decreased the cost of calibration equipment, simplified the calibration procedure, improved calibration efficiency. Using experiment, the sensor can attain relative accuracy about 0.5%, which indicates the rationality and effectivity of this method.展开更多
Oolitic hematite is an iron ore resource with rich reserves,complex composition,low grade,fine disseminated particle sizes,and a unique oolitic structure.In this study,a microwave-assisted suspension magnetization roa...Oolitic hematite is an iron ore resource with rich reserves,complex composition,low grade,fine disseminated particle sizes,and a unique oolitic structure.In this study,a microwave-assisted suspension magnetization roasting technology was proposed to recover and utilize the ore.The results showed that under the conditions of microwave pretreatment temperature of 1050℃ for 2 min,a magnetic concentrate with an iron grade of 58.72%at a recovery of 89.32%was obtained by microwave suspension magnetization roasting and magnetic separation.Moreover,compared with the no microwave pretreatment case,the iron grade and recovery increased by 3.17%and 1.58%,respectively.Microwave pretreatment increased the saturation magnetization of the roasted products from 24.974 to 39.236(A∙m^(2))/kg and the saturation susceptibility from 0.179×10^(−3) m^(3)/kg to 0.283×10^(−3) m^(3)/kg.Microcracks were formed between the iron and gangue minerals,and they gradually extended to the core of oolite with the increase in the pretreatment time.The reducing gas diffused from outside to inside along the microcracks,which promoted the selective transformation of the weak magnetic hematite into the strong magnetic magnetite.展开更多
Introduction Calixarenes are versatile host molecules for molecular recognition and supramolecular assembly because its functional groups can be readily introduced into the phenolic OH or the para position to realize...Introduction Calixarenes are versatile host molecules for molecular recognition and supramolecular assembly because its functional groups can be readily introduced into the phenolic OH or the para position to realize a wide variety of functions calixarenes-based polymers tion as these polymers can During the past decade, received increasing attenbe used to synthesize the materials that are suitable for the preparation of chemical sensor devices such as ion-selective electrodes or transport membranes.展开更多
The unique topography and historical and cultural background have determined the diversity and uniqueness of kiln architecture in the Tongchuan area.In addition to the double-slope residential architecture,traditional...The unique topography and historical and cultural background have determined the diversity and uniqueness of kiln architecture in the Tongchuan area.In addition to the double-slope residential architecture,traditional kiln dwellings with regional characteristics such as Leaning on the cliff cave dwelling,ground Pit cave dwelling and Freestanding cave dwellings have also been formed.This paper takes the inheritance and protection of traditional kiln as the starting point,and through field research and literature analysis,we have systematically collected images,measured data,and drawn up horizontal and vertical profiles and three-dimensional structure drawings of the traditional kiln dwellings in Tongchuan,and concluded the three types of forms and structural characteristics and artistic form characteristics of the traditional kiln dwellings in Tongchuan.The aim is to provide a basis and reference for the protection and inheritance of tangible and intangible cultural heritage in Shaanxi,as well as for subsequent research in this field.展开更多
As one of the major types of traditional architecture in China,traditional residential dwellings have been characterized by a variety of complex forms under the influence of different regional cultures and historical ...As one of the major types of traditional architecture in China,traditional residential dwellings have been characterized by a variety of complex forms under the influence of different regional cultures and historical background.This paper takes the opportunity to study the art and culture of traditional dwelling architecture along the Silk Road,focusing on the traditional dwellings in the southern Shaanxi region,the starting point of the Silk Road,through field research and literature research,to further elaborate and prove the regional form of traditional dwellings in the southern Shaanxi region and the causes of the formation of this north-south architectural form.Therefore,the authors summarize and analyze the architectural forms,mapping data and images and demonstrate through detailed examples of remaining dwellings in southern Shaanxi,in order to provide a theoretical basis for the preservation and inheritance of traditional dwellings in southern Shaanxi in the future.展开更多
The magnetization reduction of hematite using biomass waste can effectively utilize waste and reduce CO_(2) emission to achieve the goals of carbon peaking and carbon neutrality.The effects of temperatures on suspensi...The magnetization reduction of hematite using biomass waste can effectively utilize waste and reduce CO_(2) emission to achieve the goals of carbon peaking and carbon neutrality.The effects of temperatures on suspension magnetization roasting of hematite using biomass waste for evolved gases have been investigated using TG-FTIR,Py-GC/MS and gas composition analyzer.The mixture reduction process is divided into four stages.In the temperature range of 200-450℃ for mixture,the release of CO_(2),acids,and ketones is dominated in gases products.The yield and concentration of small molecules reducing gases increase when the temperature increases from 450 to 900℃.At 700℃,the volume concentrations of CO,H_(2) and CH_(4) peak at 8.91%,8.90% and 4.91%,respectively.During the suspension magnetization roasting process,an optimal iron concentrate with an iron grade of 70.86%,a recovery of 98.66% and a magnetic conversion of 45.70% is obtained at 700℃.Therefore,the magnetization reduction could react greatly in the temperature range of 600 to 700℃ owing to the suitable reducing gases.This study shows a detail gaseous evolution of roasting temperature and provides a new insight for studying the reduction process of hematite using biomass waste.展开更多
文摘Based on the characteristics of line structured light sensor, a speedy method for the calibration was established. With the coplanar reference target, the spacial pose between camera and optical plane can be calibrated by using of the camera’s projective center and the light’s information in the camera’s image surface. Without striction to the movement of the coplanar reference target and assistant adjustment equipment, this calibration method can be implemented. This method has been used and decreased the cost of calibration equipment, simplified the calibration procedure, improved calibration efficiency. Using experiment, the sensor can attain relative accuracy about 0.5%, which indicates the rationality and effectivity of this method.
基金Projects(51874071,51734005,52104257)supported by the National Natural Science Foundation of ChinaProject(161045)supported by the Fok Ying Tung Education Foundation for Yong Teachers in the Higher Education Institutions of China。
文摘Oolitic hematite is an iron ore resource with rich reserves,complex composition,low grade,fine disseminated particle sizes,and a unique oolitic structure.In this study,a microwave-assisted suspension magnetization roasting technology was proposed to recover and utilize the ore.The results showed that under the conditions of microwave pretreatment temperature of 1050℃ for 2 min,a magnetic concentrate with an iron grade of 58.72%at a recovery of 89.32%was obtained by microwave suspension magnetization roasting and magnetic separation.Moreover,compared with the no microwave pretreatment case,the iron grade and recovery increased by 3.17%and 1.58%,respectively.Microwave pretreatment increased the saturation magnetization of the roasted products from 24.974 to 39.236(A∙m^(2))/kg and the saturation susceptibility from 0.179×10^(−3) m^(3)/kg to 0.283×10^(−3) m^(3)/kg.Microcracks were formed between the iron and gangue minerals,and they gradually extended to the core of oolite with the increase in the pretreatment time.The reducing gas diffused from outside to inside along the microcracks,which promoted the selective transformation of the weak magnetic hematite into the strong magnetic magnetite.
基金the National Natural Science Foundation of China(No 29971023)
文摘Introduction Calixarenes are versatile host molecules for molecular recognition and supramolecular assembly because its functional groups can be readily introduced into the phenolic OH or the para position to realize a wide variety of functions calixarenes-based polymers tion as these polymers can During the past decade, received increasing attenbe used to synthesize the materials that are suitable for the preparation of chemical sensor devices such as ion-selective electrodes or transport membranes.
基金National Social Science Foundation of the Arts Key Project“Research on the Architecture Art and Folk Culture of Chinese Traditional Houses on the Land‘Silk Road’(Number:18AH008)”One of the Periodic Achievements of the Project Entrusted by the Ministry of Culture and Tourism:“Yellow River Culture and Chinese Civilization:Rescue Research on Shaanxi Traditional Residential Buildings and Residential Folk Culture”(Project Approval No.21HH02).
文摘The unique topography and historical and cultural background have determined the diversity and uniqueness of kiln architecture in the Tongchuan area.In addition to the double-slope residential architecture,traditional kiln dwellings with regional characteristics such as Leaning on the cliff cave dwelling,ground Pit cave dwelling and Freestanding cave dwellings have also been formed.This paper takes the inheritance and protection of traditional kiln as the starting point,and through field research and literature analysis,we have systematically collected images,measured data,and drawn up horizontal and vertical profiles and three-dimensional structure drawings of the traditional kiln dwellings in Tongchuan,and concluded the three types of forms and structural characteristics and artistic form characteristics of the traditional kiln dwellings in Tongchuan.The aim is to provide a basis and reference for the protection and inheritance of tangible and intangible cultural heritage in Shaanxi,as well as for subsequent research in this field.
基金Acknowledgements:The National Social Science Foundation of the Arts Key Project“Research on the Architecture Art and Folk Culture of Chinese Traditional Houses on the Land“Silk Road”(Number:18AH008)”One of the Reriodic Achievements of the Project Entrusted by the Ministry of Culture and Tourism:“Yellow River Culture and Chinese Civilization:Rescue Research on Shaanxi Traditional Residential Buildings and Residential Folk Culture”(Project Approval No.21HH02).
文摘As one of the major types of traditional architecture in China,traditional residential dwellings have been characterized by a variety of complex forms under the influence of different regional cultures and historical background.This paper takes the opportunity to study the art and culture of traditional dwelling architecture along the Silk Road,focusing on the traditional dwellings in the southern Shaanxi region,the starting point of the Silk Road,through field research and literature research,to further elaborate and prove the regional form of traditional dwellings in the southern Shaanxi region and the causes of the formation of this north-south architectural form.Therefore,the authors summarize and analyze the architectural forms,mapping data and images and demonstrate through detailed examples of remaining dwellings in southern Shaanxi,in order to provide a theoretical basis for the preservation and inheritance of traditional dwellings in southern Shaanxi in the future.
基金Project(52022019)supported by the National Natural Science Foundation of China。
文摘The magnetization reduction of hematite using biomass waste can effectively utilize waste and reduce CO_(2) emission to achieve the goals of carbon peaking and carbon neutrality.The effects of temperatures on suspension magnetization roasting of hematite using biomass waste for evolved gases have been investigated using TG-FTIR,Py-GC/MS and gas composition analyzer.The mixture reduction process is divided into four stages.In the temperature range of 200-450℃ for mixture,the release of CO_(2),acids,and ketones is dominated in gases products.The yield and concentration of small molecules reducing gases increase when the temperature increases from 450 to 900℃.At 700℃,the volume concentrations of CO,H_(2) and CH_(4) peak at 8.91%,8.90% and 4.91%,respectively.During the suspension magnetization roasting process,an optimal iron concentrate with an iron grade of 70.86%,a recovery of 98.66% and a magnetic conversion of 45.70% is obtained at 700℃.Therefore,the magnetization reduction could react greatly in the temperature range of 600 to 700℃ owing to the suitable reducing gases.This study shows a detail gaseous evolution of roasting temperature and provides a new insight for studying the reduction process of hematite using biomass waste.
