In order to research the feasibility of using the selective adsorption principle to achieve automatic shaping of nano patterns,in this study,using the liquid gallium as the conductive ink and graphene as the printing ...In order to research the feasibility of using the selective adsorption principle to achieve automatic shaping of nano patterns,in this study,using the liquid gallium as the conductive ink and graphene as the printing plate surface,by changing the surface wettability of patterned areas on the nanoscale of graphene printed boards,the automatic formation of liquid gallium patterns on the graphene printed plate surface was simulated.The results indicated that liquid gallium can achieve automatic patterning on the surface of graphene patterned areas;the greater the interaction energy between gallium and carbon atoms,the clearer the pattern;gallium liquid is prone to remain in complex local positions of the pattern,making it difficult to shape the pattern;if the spacing between adjacent pattern lines is too large or too small,it will result in residual gallium liquid between the lines;increasing the thickness of the gallium film will cause the pattern to expand beyond the boundary,but increasing the thickness of the gallium film can also enhance the thickness and uniformity of the pattern lines.In summary,the principle of selective adsorption can be used to achieve the automatic formation of nano patterns,and the pattern formation effect is influenced by factors such as atomic interaction energy and pattern configuration.展开更多
As a typical tight sandstone gasfield with strong heterogeneity,the Sulige Gas Field in the Ordos Basin faces major challenges in its development because the reservoirs in the gasfield are small in effective sand scal...As a typical tight sandstone gasfield with strong heterogeneity,the Sulige Gas Field in the Ordos Basin faces major challenges in its development because the reservoirs in the gasfield are small in effective sand scale,rapid in lithologic change,strong in plane heterogeneity,and poor in connectivity.How to scientifically deploy development wells to improve the recovery is the most important issue for the successful development of this kind of gasfields.Therefore,a well inference analysis was conducted tofigure out the impact of well pattern density on the recovery based on the research of many years in gasfield development methods and the summary of practical effect.In this paper,we put forward for thefirst time the concept of inter-well interference probability,and present the relationship between the probability of inter-well interference and well pattern density of the Sulige Gas Field.Then we established a mathematical model for the optimization of development well pattern by combiningfine sand anatomy,reservoir engineering,numerical simulation and economic evaluation,and obtained a quantitative relationship between recovery and well pattern density.Furthermore,on the basis of comprehensive analysis,a reasonable development well pattern was designed for the Sulige Gas Field:this well pattern is parallelogram in shape,with a density of 3.1 wells/km2,well spacing of 500 m,and row spacing of 650 m.Development practices have confirmed that this scheme is capable of achieving better economic benefits,producing geological reserves as far as possible and improving the ultimate recovery of such gasfields.展开更多
English words in pairs are a special form of English idioms, which have different kinds and are used widely. For English learners, words in pairs are one of the difficult points. This paper discusses their form patter...English words in pairs are a special form of English idioms, which have different kinds and are used widely. For English learners, words in pairs are one of the difficult points. This paper discusses their form patterns, semantic relations, grammatical functions, rhetoric features and their application in translation. Its purpose is to help learners understand and use them accurately and correctly so as to improve language expressing ability.展开更多
With rapid urban expansion across Tanzania,there is a need to institute steps to address factors and forms as well as impacts and challenges associated with the observed trend.This study’s aim is to use spatial urban...With rapid urban expansion across Tanzania,there is a need to institute steps to address factors and forms as well as impacts and challenges associated with the observed trend.This study’s aim is to use spatial urban landscape indices to analyze the spatial changes in urban forms,patterns,and rates across 11 urban centers in Tanzania over a 30-year study period(1990–2020).During the past three decades,urban lands of 11 cities and town in Tanzania have grown by a total of 480 km2.Leapfrog growth was found as the most dominant form of urban expansion in Tanzania while Dodoma,the capital city of Tanzania,had the highest rate of urban expansion when compared to all other individual cities.The most robust and significant interaction of the AWMLEI and MLEI was found in Kigoma,Arusha,Mtwara,Mafinga,and Tunduma cities.In contrast,Mbeya agricultural city,Arusha the tourist city,Tabora,and Geita Lake zone areas did show their own peculiarities revealing an interesting spatial temporal variation in rate and form of expansion.The outcome of this study reveals that the influence and management of economic and socio-cultural opportunities will be an effective tool for the determination of the rapidly expanding cities and towns of Tanzania.展开更多
文摘In order to research the feasibility of using the selective adsorption principle to achieve automatic shaping of nano patterns,in this study,using the liquid gallium as the conductive ink and graphene as the printing plate surface,by changing the surface wettability of patterned areas on the nanoscale of graphene printed boards,the automatic formation of liquid gallium patterns on the graphene printed plate surface was simulated.The results indicated that liquid gallium can achieve automatic patterning on the surface of graphene patterned areas;the greater the interaction energy between gallium and carbon atoms,the clearer the pattern;gallium liquid is prone to remain in complex local positions of the pattern,making it difficult to shape the pattern;if the spacing between adjacent pattern lines is too large or too small,it will result in residual gallium liquid between the lines;increasing the thickness of the gallium film will cause the pattern to expand beyond the boundary,but increasing the thickness of the gallium film can also enhance the thickness and uniformity of the pattern lines.In summary,the principle of selective adsorption can be used to achieve the automatic formation of nano patterns,and the pattern formation effect is influenced by factors such as atomic interaction energy and pattern configuration.
文摘As a typical tight sandstone gasfield with strong heterogeneity,the Sulige Gas Field in the Ordos Basin faces major challenges in its development because the reservoirs in the gasfield are small in effective sand scale,rapid in lithologic change,strong in plane heterogeneity,and poor in connectivity.How to scientifically deploy development wells to improve the recovery is the most important issue for the successful development of this kind of gasfields.Therefore,a well inference analysis was conducted tofigure out the impact of well pattern density on the recovery based on the research of many years in gasfield development methods and the summary of practical effect.In this paper,we put forward for thefirst time the concept of inter-well interference probability,and present the relationship between the probability of inter-well interference and well pattern density of the Sulige Gas Field.Then we established a mathematical model for the optimization of development well pattern by combiningfine sand anatomy,reservoir engineering,numerical simulation and economic evaluation,and obtained a quantitative relationship between recovery and well pattern density.Furthermore,on the basis of comprehensive analysis,a reasonable development well pattern was designed for the Sulige Gas Field:this well pattern is parallelogram in shape,with a density of 3.1 wells/km2,well spacing of 500 m,and row spacing of 650 m.Development practices have confirmed that this scheme is capable of achieving better economic benefits,producing geological reserves as far as possible and improving the ultimate recovery of such gasfields.
文摘English words in pairs are a special form of English idioms, which have different kinds and are used widely. For English learners, words in pairs are one of the difficult points. This paper discusses their form patterns, semantic relations, grammatical functions, rhetoric features and their application in translation. Its purpose is to help learners understand and use them accurately and correctly so as to improve language expressing ability.
基金supported by the Sokoine University of Agriculture Research and Innovation Support(SUARIS)2nd Phase special Grant[2022/2024]the Directorate of Postgraduate Studies,Research,Technology Transfer and Consultancy(DPRTC).
文摘With rapid urban expansion across Tanzania,there is a need to institute steps to address factors and forms as well as impacts and challenges associated with the observed trend.This study’s aim is to use spatial urban landscape indices to analyze the spatial changes in urban forms,patterns,and rates across 11 urban centers in Tanzania over a 30-year study period(1990–2020).During the past three decades,urban lands of 11 cities and town in Tanzania have grown by a total of 480 km2.Leapfrog growth was found as the most dominant form of urban expansion in Tanzania while Dodoma,the capital city of Tanzania,had the highest rate of urban expansion when compared to all other individual cities.The most robust and significant interaction of the AWMLEI and MLEI was found in Kigoma,Arusha,Mtwara,Mafinga,and Tunduma cities.In contrast,Mbeya agricultural city,Arusha the tourist city,Tabora,and Geita Lake zone areas did show their own peculiarities revealing an interesting spatial temporal variation in rate and form of expansion.The outcome of this study reveals that the influence and management of economic and socio-cultural opportunities will be an effective tool for the determination of the rapidly expanding cities and towns of Tanzania.
