Eight-element contents of 653 unpolished rice samples harvested from Xingping experiment farm, Yunnan Province under the same ecological conditions were analyzed by ICP-AES method. The mineral elements content were cl...Eight-element contents of 653 unpolished rice samples harvested from Xingping experiment farm, Yunnan Province under the same ecological conditions were analyzed by ICP-AES method. The mineral elements content were closely related to low diversity, high-yielding, and multi-resistance breeding; The K, Mg, Ca and Mn content in high-yielding and resistant varieties were high, and other nutrients such as P, Fe, Zn and Cu were low, which was connected with the heredity and physiological mechanism of mineral nutrients. There is zonal distribution of mineral elements content from Yunnan rice, especially for P, Fe, Zn and Cu co-related with the diversity center, paddy versus upland, glutinous and non-glutinous, glume-hair versus nuda, rice color, rice flavor, soft rice versus non-soft rice, but it did not find any association with indica-japonica types. The results supported the ecological variety group view of 5-grade taxonomic system species-subspecies-ecological groups-ecological variety groups - varietal types' .展开更多
Correlations between four grain quality, 24 plant morphological traits and eight element contents of 653 accessions from Yunnan rice were analyzed. P, K, Ca and Mg contents of core collection were closely correlated t...Correlations between four grain quality, 24 plant morphological traits and eight element contents of 653 accessions from Yunnan rice were analyzed. P, K, Ca and Mg contents of core collection were closely correlated to the most plant morphological and grain quality traits, and there were highly significant correlations （P 〈0.01） among some traits including P content to number of stems and tillers, K content and amylose content, Ca content and plant height, Mg content and protein content. Mn, Zn, Cu and Fe contents of core collection were closely related to a few traits, such as Fe content and gel consistency （-0.1121^＊＊）, Zn content and seed setting rate （-0.1411^＊＊）, Cu content and number of grains per panicle （-0.1398^＊＊）, Mn content and plant height （-0.2492^＊＊）.展开更多
Fused corundum is a rather promising raw material for preparing an alumina-based ceramic core due to its excellent high temperature resistance and chemical inertness.In this study,alumina-based ceramic cores were prep...Fused corundum is a rather promising raw material for preparing an alumina-based ceramic core due to its excellent high temperature resistance and chemical inertness.In this study,alumina-based ceramic cores were prepared using fused corundum as the matrix material,and the effect of varying silica powder contents on the properties of the alumina-based ceramic cores,including the sintering shrinkage,the flexural strength,and the high temperature deformation was investigated.The mineralization mechanisms of the silica on the alumina-based ceramic core were also analyzed.The optimum addition amount of silica in this experiment is 8% in weight.At that moment,the aluminum-based core has both a low sintering shrinkage coefficient of 0.66% and better properties:the room temperature flexural strength is 22.19 MPa,the high temperature flexural strength is 21.54 MPa,the high temperature deformation is 0.93 mm,and the residual flexural strength is 47.41 MPa.展开更多
Altered igneous reservoirs have low porosity and permeability,compact structure and certain heterogeneity.A simple digital core with certain generality and multi-parameter constraints can be con-structed to characteri...Altered igneous reservoirs have low porosity and permeability,compact structure and certain heterogeneity.A simple digital core with certain generality and multi-parameter constraints can be con-structed to characterize the microscopic pore structure and mineral composition.In this paper,based on core X-ray,CT images and whole-rock mineral analysis,threshold segmentation of mass content and grayscale distribution of various minerals in different lithologies of igneous rocks in the buried hill of Huizhou depression is carried out to construct digital core of altered igneous rocks.The results show that after converting the mineral mass content into volume content,the minerals of altered igneous rocks in Huizhou depression can be classified into components.According to the range of grayscale value,components can be divided into six parts.Due to the difference of the content of components in different lithologies of igneous rocks,differentiated grayscale threshold segmentation is needed to obtain the digital core for a single lithology.The final digital core generation process includes two steps:building a single component digital core,and stacking and combining.This kind of universal digital core model can support the subsequent pore scale numerical simulation and comprehensive rock physics research.展开更多
A new highly efficient, visible light active, silver vanadate/polymeric carbonitride “core/shell” photocatalyst was prepared mechano-chemically prepared by grinding mixtures of <i><span><span style=&q...A new highly efficient, visible light active, silver vanadate/polymeric carbonitride “core/shell” photocatalyst was prepared mechano-chemically prepared by grinding mixtures of <i><span><span style="white-space:nowrap;">β</span></span></i><span>-silver vanadate and mesoporous graphitic carbonitride. Besides the core/shell photocatalyst, </span><i><span><span style="white-space:nowrap;">β</span></span></i><span>-silver vanadate/mesoporous polymeric carbonitride composites and supported mpg-C</span><sub><span>3</span></sub><span>N</span><sub><span>4</span></sub><span><span style="white-space:nowrap;">@</span></span><i><span><span style="white-space:nowrap;">β</span></span></i><span>-silver vanadates were prepared. The materials were characterized by transmission elec</span><span>tron microscopy (TEM), X-ray diffraction (XRD), nitrogen ad- and</span><span> de-sorption, diffuse reflectance UV-Vis measurement (DRS), infrared spectroscopy, Raman microscopy, and time-resolved photoluminescence spectroscopy. The photocatalytic performance of the materials was investigated in the degradation of organics using pharmaceutical ibuprofen and 4-(isobutyl phenyl) propionic acid sodium salt as model compounds under batch conditions. Reaction intermediates were studied by electrospray ionization and time-of-flight mass spectrometry (ESI-TOF-MS). Additionally, the degree of mineralization was determined by total organic carbon TOC measurements. The core/shell photocatalyst has shown superior photocatalytic activity compared to the other prepared composites or supported photocatalysts as well as the single mpg-C</span><sub><span>3</span></sub><span>N</span><sub><span>4</span></sub><span>. Scavenger experiments showed that valence band holes and anio</span><span>nic superoxide radicals are the main active species in the photocatalytic</span><span> process. TOC measurement confirmed the mineralization of the organic compound, which was in line with ESI-TOF-MS experiments. Time-resolved photoluminescence measurements indicated that charges generated in carbonitride migrate via diffusive hopping and exhibit increased mobility in the case of the silver vanadate/polymeric carbonitride composite.</span>展开更多
通过分析测定南海北部湾中东部海底柱状沉积物的主量、微量元素和矿物组成,结合AMS^(14)C定年,研究了11.3 ka BP以来该海域全新世沉积地球化学特征及其对物源和海洋环境变化的指示意义。结果表明,剖面以86 cm为界限,大部分主量、微量元...通过分析测定南海北部湾中东部海底柱状沉积物的主量、微量元素和矿物组成,结合AMS^(14)C定年,研究了11.3 ka BP以来该海域全新世沉积地球化学特征及其对物源和海洋环境变化的指示意义。结果表明,剖面以86 cm为界限,大部分主量、微量元素含量呈现明显的上、下两阶段变化特征,分别为3.2~0.2 ka BP的上部沉积层段(86~4 cm)和11.3~3.2 ka BP的下部沉积层段(200~86 cm),其中Si、Ca、Zr等元素含量在上部层段沉积物中显著减少,而A1、Fe、Ti、V、Cr、Co等元素含量明显升高,稀土元素含量变化不明显。此外,剖面中的矿物组成主要为石英、伊利石、绿泥石和长石。相比于下部层段,上部层段中绿泥石含量更高、长石含量更低。综合来看,沉积物物源输入比较稳定,主要来自周边海岸侵蚀产物和琼州海峡的下切侵蚀产物,其次是红河和珠江携带的沉积物。剖面上、下层段沉积物中元素和矿物含量的差异主要与3.2 ka BP以来,高海平面下琼州海峡进一步扩张引起的海底下沉和海水深度增加有关,从而导致上部沉积时期水动力较弱,黏土矿物含量增加。展开更多
COLLINS ice cap is located in King George Island south of Shetland Islands,Antarctic.The icecap is exposed over an area of about 1 300 km^2,amounting to 90% of the island.China na-tional scientific expeditions to the ...COLLINS ice cap is located in King George Island south of Shetland Islands,Antarctic.The icecap is exposed over an area of about 1 300 km^2,amounting to 90% of the island.China na-tional scientific expeditions to the Antarctic studied and investigated Collins ice cap systemati-cally from May to October 1992 when they drilled six ice cores in Low ice dome.Volcano ex-trusion in ice core from Collins ice cap suggested by Dia et al.is favourable for展开更多
文摘Eight-element contents of 653 unpolished rice samples harvested from Xingping experiment farm, Yunnan Province under the same ecological conditions were analyzed by ICP-AES method. The mineral elements content were closely related to low diversity, high-yielding, and multi-resistance breeding; The K, Mg, Ca and Mn content in high-yielding and resistant varieties were high, and other nutrients such as P, Fe, Zn and Cu were low, which was connected with the heredity and physiological mechanism of mineral nutrients. There is zonal distribution of mineral elements content from Yunnan rice, especially for P, Fe, Zn and Cu co-related with the diversity center, paddy versus upland, glutinous and non-glutinous, glume-hair versus nuda, rice color, rice flavor, soft rice versus non-soft rice, but it did not find any association with indica-japonica types. The results supported the ecological variety group view of 5-grade taxonomic system species-subspecies-ecological groups-ecological variety groups - varietal types' .
基金supported by the National Natural Science Foundation of China(30260060)a grant from the Natural Science Foundation of Yunnan,China(2002C0077M).
文摘Correlations between four grain quality, 24 plant morphological traits and eight element contents of 653 accessions from Yunnan rice were analyzed. P, K, Ca and Mg contents of core collection were closely correlated to the most plant morphological and grain quality traits, and there were highly significant correlations （P 〈0.01） among some traits including P content to number of stems and tillers, K content and amylose content, Ca content and plant height, Mg content and protein content. Mn, Zn, Cu and Fe contents of core collection were closely related to a few traits, such as Fe content and gel consistency （-0.1121^＊＊）, Zn content and seed setting rate （-0.1411^＊＊）, Cu content and number of grains per panicle （-0.1398^＊＊）, Mn content and plant height （-0.2492^＊＊）.
基金financially supported by the National Science and Technology Major Project of Aero Engine and Gas Turbine(2017-Ⅶ-0008)。
文摘Fused corundum is a rather promising raw material for preparing an alumina-based ceramic core due to its excellent high temperature resistance and chemical inertness.In this study,alumina-based ceramic cores were prepared using fused corundum as the matrix material,and the effect of varying silica powder contents on the properties of the alumina-based ceramic cores,including the sintering shrinkage,the flexural strength,and the high temperature deformation was investigated.The mineralization mechanisms of the silica on the alumina-based ceramic core were also analyzed.The optimum addition amount of silica in this experiment is 8% in weight.At that moment,the aluminum-based core has both a low sintering shrinkage coefficient of 0.66% and better properties:the room temperature flexural strength is 22.19 MPa,the high temperature flexural strength is 21.54 MPa,the high temperature deformation is 0.93 mm,and the residual flexural strength is 47.41 MPa.
基金Supported by Project of the National Natural Science Foundation of China (No. 42072323)
文摘Altered igneous reservoirs have low porosity and permeability,compact structure and certain heterogeneity.A simple digital core with certain generality and multi-parameter constraints can be con-structed to characterize the microscopic pore structure and mineral composition.In this paper,based on core X-ray,CT images and whole-rock mineral analysis,threshold segmentation of mass content and grayscale distribution of various minerals in different lithologies of igneous rocks in the buried hill of Huizhou depression is carried out to construct digital core of altered igneous rocks.The results show that after converting the mineral mass content into volume content,the minerals of altered igneous rocks in Huizhou depression can be classified into components.According to the range of grayscale value,components can be divided into six parts.Due to the difference of the content of components in different lithologies of igneous rocks,differentiated grayscale threshold segmentation is needed to obtain the digital core for a single lithology.The final digital core generation process includes two steps:building a single component digital core,and stacking and combining.This kind of universal digital core model can support the subsequent pore scale numerical simulation and comprehensive rock physics research.
文摘A new highly efficient, visible light active, silver vanadate/polymeric carbonitride “core/shell” photocatalyst was prepared mechano-chemically prepared by grinding mixtures of <i><span><span style="white-space:nowrap;">β</span></span></i><span>-silver vanadate and mesoporous graphitic carbonitride. Besides the core/shell photocatalyst, </span><i><span><span style="white-space:nowrap;">β</span></span></i><span>-silver vanadate/mesoporous polymeric carbonitride composites and supported mpg-C</span><sub><span>3</span></sub><span>N</span><sub><span>4</span></sub><span><span style="white-space:nowrap;">@</span></span><i><span><span style="white-space:nowrap;">β</span></span></i><span>-silver vanadates were prepared. The materials were characterized by transmission elec</span><span>tron microscopy (TEM), X-ray diffraction (XRD), nitrogen ad- and</span><span> de-sorption, diffuse reflectance UV-Vis measurement (DRS), infrared spectroscopy, Raman microscopy, and time-resolved photoluminescence spectroscopy. The photocatalytic performance of the materials was investigated in the degradation of organics using pharmaceutical ibuprofen and 4-(isobutyl phenyl) propionic acid sodium salt as model compounds under batch conditions. Reaction intermediates were studied by electrospray ionization and time-of-flight mass spectrometry (ESI-TOF-MS). Additionally, the degree of mineralization was determined by total organic carbon TOC measurements. The core/shell photocatalyst has shown superior photocatalytic activity compared to the other prepared composites or supported photocatalysts as well as the single mpg-C</span><sub><span>3</span></sub><span>N</span><sub><span>4</span></sub><span>. Scavenger experiments showed that valence band holes and anio</span><span>nic superoxide radicals are the main active species in the photocatalytic</span><span> process. TOC measurement confirmed the mineralization of the organic compound, which was in line with ESI-TOF-MS experiments. Time-resolved photoluminescence measurements indicated that charges generated in carbonitride migrate via diffusive hopping and exhibit increased mobility in the case of the silver vanadate/polymeric carbonitride composite.</span>
文摘通过分析测定南海北部湾中东部海底柱状沉积物的主量、微量元素和矿物组成,结合AMS^(14)C定年,研究了11.3 ka BP以来该海域全新世沉积地球化学特征及其对物源和海洋环境变化的指示意义。结果表明,剖面以86 cm为界限,大部分主量、微量元素含量呈现明显的上、下两阶段变化特征,分别为3.2~0.2 ka BP的上部沉积层段(86~4 cm)和11.3~3.2 ka BP的下部沉积层段(200~86 cm),其中Si、Ca、Zr等元素含量在上部层段沉积物中显著减少,而A1、Fe、Ti、V、Cr、Co等元素含量明显升高,稀土元素含量变化不明显。此外,剖面中的矿物组成主要为石英、伊利石、绿泥石和长石。相比于下部层段,上部层段中绿泥石含量更高、长石含量更低。综合来看,沉积物物源输入比较稳定,主要来自周边海岸侵蚀产物和琼州海峡的下切侵蚀产物,其次是红河和珠江携带的沉积物。剖面上、下层段沉积物中元素和矿物含量的差异主要与3.2 ka BP以来,高海平面下琼州海峡进一步扩张引起的海底下沉和海水深度增加有关,从而导致上部沉积时期水动力较弱,黏土矿物含量增加。
文摘COLLINS ice cap is located in King George Island south of Shetland Islands,Antarctic.The icecap is exposed over an area of about 1 300 km^2,amounting to 90% of the island.China na-tional scientific expeditions to the Antarctic studied and investigated Collins ice cap systemati-cally from May to October 1992 when they drilled six ice cores in Low ice dome.Volcano ex-trusion in ice core from Collins ice cap suggested by Dia et al.is favourable for
