Many business shops with old brand are located near Jianlou in Qianmen. Among them, Quanjude Roast Duck, Ruifuxiang Silk, Duyichu and Laozhengxing are almost known to every person in Beijing. Dawancha (Big-bowl tea) i...Many business shops with old brand are located near Jianlou in Qianmen. Among them, Quanjude Roast Duck, Ruifuxiang Silk, Duyichu and Laozhengxing are almost known to every person in Beijing. Dawancha (Big-bowl tea) is the most eye-catching scene around Qianmen business district. Today, Lao She Tea House is the most popular one of its kind in Beijing. Its small main gate with antique flavour usually展开更多
This year marks the 111th anniversary of the birth of Lao She, one of the most influential playwrights and novelists in China. To pay homage to this literary master,
This work focuses on the dynamic rheological behavior of low water-to-binder ratio cement mortars blended with fly ash microspheres（FAM） or silica fume（SF）. The initial slump flow of each group has been controlled...This work focuses on the dynamic rheological behavior of low water-to-binder ratio cement mortars blended with fly ash microspheres（FAM） or silica fume（SF）. The initial slump flow of each group has been controlled at similar values by adjusting the superplasticizer dosages. With the help of a coaxial cylinder rheometer, the dynamic rheological behaviors of these mortars are investigated by frequency sweeping in the range of 0-2 Hz under large amplitude oscillatory shear（LAOS）. Based on the systematical elaboration of dynamic rheological testing theory, the experimental data are processed according to Lissajous plot fitting to reveal the viscoelastic characteristics. The nonlinearity of response signals is further assessed with Fourier transform（FT） analysis. The parameters, storage modulus G＇, loss modulus G＂ and relative amplitude I3/I1 are proposed to clarify the influences of FAM and SF on the stability and energy consumption of local structures and nonlinearity of response torques. The hydration characteristics of various groups well confirmed the rheological phenomenon. This study is beneficial for the preparation and optimization of flow state concrete such as pumping concrete and self-compacting concrete.展开更多
The Dongsithouane National Production Forest (DNPF) is one of the largest natural forest areas in Savannakhet, Lao PDR, which has been a vital support for the local community’s livelihood, Recently, significant chang...The Dongsithouane National Production Forest (DNPF) is one of the largest natural forest areas in Savannakhet, Lao PDR, which has been a vital support for the local community’s livelihood, Recently, significant changes in land use and land cover (LULC) have been observed in this area, leading to a reduction of natural forests. There were two separate methods of this study: firstly, to identify LULC changes across three different periods, spectral imagery from the Landsat 5 Thematic Mapper (TM) for the years 2001 and 2011, and the Landsat 8 Operational Land Imager (OLI) for 2021 were used as the primary data sources. The satellite images were preprocessed for various forest classes, including pretreatment of the top of atmosphere reflectance by using QGIS software’s semi-automatic classification plug-in (SCP), and ArcGIS was used for post-classification. A supervised classification approach was applied to the satellite images from 2001, 2011, and 2021 to generate diverse maps of LULC. Secondly, a household survey dataset was used to investigate influential factors. Approximately 220 households were interviewed in order to collect socio-economic information (including data on population growth, increased business activities, location of the area, agriculture land expansion, and need for settlement land). Household survey data was analyzed by using SPSS. Descriptive statistics, including frequency distributions and percentages, were applied to observe characteristics. Additionally, a binary logistic regression model was used to analyze the socioeconomic factors related to LULC change in DNPF. Key findings indicated a decline in natural forest areas within the study site. Specifically, both dry dipterocarp forest (−11.35%) and mixed deciduous forest (−0.18%) decreased from 2001 to 2021. The overall accuracy of the LULC maps was 94%, 86%, and 89% for the years 2001, 2011, and 2021 respectively. In contrast, agricultural land increased significantly by 155.70%, while built-up land, and water bodies increased by 65.54% and 35.33%, respectively. The results also highlighted a significant increase in construction land, up to 65.54%. Furthermore, the study found a correlation between agricultural expansion and a reduction of forest areas, along with an increase in built-up land along the forest areas’ boundaries. Timber exploitation and charcoal production also contributed to the decline in forest cover. The logistic regression model identified significant determinants of LULC change, including the area’s location, agricultural land expansion, increased business activity, and the need for settlement land. These factors have influenced the management of DNPF. Urgent sustainable management practices and actions, including forest ecosystem protection, village agricultural zoning, water source and watershed protection and public awareness, are required to preserve the forest areas of DNPF.展开更多
A new species, Bactrocera （Zeugodacus） gansuica Chen, Han et Zhou sp. nov., is discovered from China, and B （Z.） vultus （Hardy, 1973） is recorded for the first time in Laos. These two species are here described ...A new species, Bactrocera （Zeugodacus） gansuica Chen, Han et Zhou sp. nov., is discovered from China, and B （Z.） vultus （Hardy, 1973） is recorded for the first time in Laos. These two species are here described and illustrated.展开更多
Based on the brief introduction of western contemporary eco-philosophies and Lao Zi’s eco-philosophy,there will be an analysis of the differences according to historical context and critical target and their converge...Based on the brief introduction of western contemporary eco-philosophies and Lao Zi’s eco-philosophy,there will be an analysis of the differences according to historical context and critical target and their convergence.The analysis leads to the conclusion that eco-philosophies,whether contemporary or ancient,are against any form of domination and centrism.展开更多
Assessment of the forest land use change and proposed land suitability for tea for the area along Laos – China Border were the main purpose of this research paper. An integrated GIS-based analysis system （IGAS）, su...Assessment of the forest land use change and proposed land suitability for tea for the area along Laos – China Border were the main purpose of this research paper. An integrated GIS-based analysis system （IGAS）, supporting assessment of forest land-use and land suitability for the study area where along Laos-China border was developed. Multi criteria analysis and system dynamics techniques were used to assess forest land use and land suitability and to forecast potential land-use for tea. The total study area is estimated at 10 325.07 km2 according to the field data collection and data analysis. The area of current forest cover decreased rapidly from 6337.33 km2 （61.38%） in 1992 to 5106.28 km2 （49.46%） in 2002 in the study area. The current forest was mainly trans-ferred to potential forest and permanent agriculture especially to rubber plantation areas even in the National Conservation Biodiversity Conser-vation Areas. The main causes of forest land use change are poverty. In order to address the problems, land suitability classification for tea was developed based on the multi-criteria. And finally two options of land suitability classification for tea for the study areas were developed.展开更多
BaTi O3(BTO)与LaAlO3(LAO)组成的BTO/LAO超晶格的介电性能呈现新的变化特点.作者模拟计算了不同弛豫时间对不同层状周期结构的BTO/LAO超晶格介电性能的变化规律;模拟计算表明,BTO/LAO超晶格在厚度为0.8nm/0.8nm～1.6nm/1.6nm时介电常...BaTi O3(BTO)与LaAlO3(LAO)组成的BTO/LAO超晶格的介电性能呈现新的变化特点.作者模拟计算了不同弛豫时间对不同层状周期结构的BTO/LAO超晶格介电性能的变化规律;模拟计算表明,BTO/LAO超晶格在厚度为0.8nm/0.8nm～1.6nm/1.6nm时介电常数出现极大值.认为超晶格的界面电荷的累积对于弛豫时间的作用直接影响了BTO/LAO超晶格的介电性能;BTO/LAO超晶格的介电损耗主要来源于BTO/LAO超晶格的电导率.展开更多
The Truong Son Fold Belt,located at the northeastern margin of the Indochina Block,is considered to be tectonically linked to the subduction of the Paleotethys Ocean and subsequent collision.Sepon is one of the most i...The Truong Son Fold Belt,located at the northeastern margin of the Indochina Block,is considered to be tectonically linked to the subduction of the Paleotethys Ocean and subsequent collision.Sepon is one of the most important super large deposits of the Truong Son Fold Belt.Our LA-ICP-MS zircon U-Pb dating results show that granodiorite porphyry samples from the Sepon deposit have ages of 302.1-4-2.9 Ma, which is a crucial phase for magmatic-tectonical activities from the Late Carboniferous to Early Permian and has avital influence on the mineralization of copper and gold.Zircon from granodiorite porphyry yields εHf (t)values of 4.32 to 9.64,and TDM2 has an average age of 914 Ma,suggesting that the source of the granodiorite porphyry in the region were mainly mantle components but underwent mixing and contamination of crust materials.The Ce^4+/Ce^3+ value of zircon in the granodiorite porphyry varys greatly from 2.4 to 1438.29,which shows magma mixing might occur.Considering the characteristics of trace elements in the zircon and the whole rock geochemical characteristics of intrusion rocks as well as the characteristics of regional volcanic-sedimentary association,it is indicated that the tectonic setting may be the continental arc environment.The Sepon Au-Cu deposit is derived from emplacement of calc-alkaline intermediate-acid magma with coming from deep sources in the subduction process of the Paleotethys Ocean,forming porphyry Mo-Cu,skam Cu-Au mineralization and a hydrothermal sedimentary-hosted Au mineralization in the wall rocks.展开更多
文摘Many business shops with old brand are located near Jianlou in Qianmen. Among them, Quanjude Roast Duck, Ruifuxiang Silk, Duyichu and Laozhengxing are almost known to every person in Beijing. Dawancha (Big-bowl tea) is the most eye-catching scene around Qianmen business district. Today, Lao She Tea House is the most popular one of its kind in Beijing. Its small main gate with antique flavour usually
文摘This year marks the 111th anniversary of the birth of Lao She, one of the most influential playwrights and novelists in China. To pay homage to this literary master,
基金Fundey by the Major State Basic Research Development Program of China(973 Program)(No.2015CB655101)the National Natural Science Foundations of China(No.51379163)
文摘This work focuses on the dynamic rheological behavior of low water-to-binder ratio cement mortars blended with fly ash microspheres（FAM） or silica fume（SF）. The initial slump flow of each group has been controlled at similar values by adjusting the superplasticizer dosages. With the help of a coaxial cylinder rheometer, the dynamic rheological behaviors of these mortars are investigated by frequency sweeping in the range of 0-2 Hz under large amplitude oscillatory shear（LAOS）. Based on the systematical elaboration of dynamic rheological testing theory, the experimental data are processed according to Lissajous plot fitting to reveal the viscoelastic characteristics. The nonlinearity of response signals is further assessed with Fourier transform（FT） analysis. The parameters, storage modulus G＇, loss modulus G＂ and relative amplitude I3/I1 are proposed to clarify the influences of FAM and SF on the stability and energy consumption of local structures and nonlinearity of response torques. The hydration characteristics of various groups well confirmed the rheological phenomenon. This study is beneficial for the preparation and optimization of flow state concrete such as pumping concrete and self-compacting concrete.
文摘The Dongsithouane National Production Forest (DNPF) is one of the largest natural forest areas in Savannakhet, Lao PDR, which has been a vital support for the local community’s livelihood, Recently, significant changes in land use and land cover (LULC) have been observed in this area, leading to a reduction of natural forests. There were two separate methods of this study: firstly, to identify LULC changes across three different periods, spectral imagery from the Landsat 5 Thematic Mapper (TM) for the years 2001 and 2011, and the Landsat 8 Operational Land Imager (OLI) for 2021 were used as the primary data sources. The satellite images were preprocessed for various forest classes, including pretreatment of the top of atmosphere reflectance by using QGIS software’s semi-automatic classification plug-in (SCP), and ArcGIS was used for post-classification. A supervised classification approach was applied to the satellite images from 2001, 2011, and 2021 to generate diverse maps of LULC. Secondly, a household survey dataset was used to investigate influential factors. Approximately 220 households were interviewed in order to collect socio-economic information (including data on population growth, increased business activities, location of the area, agriculture land expansion, and need for settlement land). Household survey data was analyzed by using SPSS. Descriptive statistics, including frequency distributions and percentages, were applied to observe characteristics. Additionally, a binary logistic regression model was used to analyze the socioeconomic factors related to LULC change in DNPF. Key findings indicated a decline in natural forest areas within the study site. Specifically, both dry dipterocarp forest (−11.35%) and mixed deciduous forest (−0.18%) decreased from 2001 to 2021. The overall accuracy of the LULC maps was 94%, 86%, and 89% for the years 2001, 2011, and 2021 respectively. In contrast, agricultural land increased significantly by 155.70%, while built-up land, and water bodies increased by 65.54% and 35.33%, respectively. The results also highlighted a significant increase in construction land, up to 65.54%. Furthermore, the study found a correlation between agricultural expansion and a reduction of forest areas, along with an increase in built-up land along the forest areas’ boundaries. Timber exploitation and charcoal production also contributed to the decline in forest cover. The logistic regression model identified significant determinants of LULC change, including the area’s location, agricultural land expansion, increased business activity, and the need for settlement land. These factors have influenced the management of DNPF. Urgent sustainable management practices and actions, including forest ecosystem protection, village agricultural zoning, water source and watershed protection and public awareness, are required to preserve the forest areas of DNPF.
基金supported by the National Natural Science Foundation of China (30770267)Special Fund for Entry-Exit Inspections and Quarantine Scientific Research in the Public Interest (201210079)
文摘A new species, Bactrocera （Zeugodacus） gansuica Chen, Han et Zhou sp. nov., is discovered from China, and B （Z.） vultus （Hardy, 1973） is recorded for the first time in Laos. These two species are here described and illustrated.
文摘Based on the brief introduction of western contemporary eco-philosophies and Lao Zi’s eco-philosophy,there will be an analysis of the differences according to historical context and critical target and their convergence.The analysis leads to the conclusion that eco-philosophies,whether contemporary or ancient,are against any form of domination and centrism.
文摘Assessment of the forest land use change and proposed land suitability for tea for the area along Laos – China Border were the main purpose of this research paper. An integrated GIS-based analysis system （IGAS）, supporting assessment of forest land-use and land suitability for the study area where along Laos-China border was developed. Multi criteria analysis and system dynamics techniques were used to assess forest land use and land suitability and to forecast potential land-use for tea. The total study area is estimated at 10 325.07 km2 according to the field data collection and data analysis. The area of current forest cover decreased rapidly from 6337.33 km2 （61.38%） in 1992 to 5106.28 km2 （49.46%） in 2002 in the study area. The current forest was mainly trans-ferred to potential forest and permanent agriculture especially to rubber plantation areas even in the National Conservation Biodiversity Conser-vation Areas. The main causes of forest land use change are poverty. In order to address the problems, land suitability classification for tea was developed based on the multi-criteria. And finally two options of land suitability classification for tea for the study areas were developed.
基金the National Science Foundation of China (41373036, 41002027)the Geological Survey of China Geological Survey Project (121201103000150006,121201066307).
文摘The Truong Son Fold Belt,located at the northeastern margin of the Indochina Block,is considered to be tectonically linked to the subduction of the Paleotethys Ocean and subsequent collision.Sepon is one of the most important super large deposits of the Truong Son Fold Belt.Our LA-ICP-MS zircon U-Pb dating results show that granodiorite porphyry samples from the Sepon deposit have ages of 302.1-4-2.9 Ma, which is a crucial phase for magmatic-tectonical activities from the Late Carboniferous to Early Permian and has avital influence on the mineralization of copper and gold.Zircon from granodiorite porphyry yields εHf (t)values of 4.32 to 9.64,and TDM2 has an average age of 914 Ma,suggesting that the source of the granodiorite porphyry in the region were mainly mantle components but underwent mixing and contamination of crust materials.The Ce^4+/Ce^3+ value of zircon in the granodiorite porphyry varys greatly from 2.4 to 1438.29,which shows magma mixing might occur.Considering the characteristics of trace elements in the zircon and the whole rock geochemical characteristics of intrusion rocks as well as the characteristics of regional volcanic-sedimentary association,it is indicated that the tectonic setting may be the continental arc environment.The Sepon Au-Cu deposit is derived from emplacement of calc-alkaline intermediate-acid magma with coming from deep sources in the subduction process of the Paleotethys Ocean,forming porphyry Mo-Cu,skam Cu-Au mineralization and a hydrothermal sedimentary-hosted Au mineralization in the wall rocks.
