To gain an understanding of gas occurrence, distribution is the fundamental basis for preventing gas disasters. Presently, how tectonic structures control gas occurrence remains problematic. This study proposes the th...To gain an understanding of gas occurrence, distribution is the fundamental basis for preventing gas disasters. Presently, how tectonic structures control gas occurrence remains problematic. This study proposes the theory and elucidates the mechanism of stepwise tectonic control on gas occurrence according to the characteristics of gas occurrence and the patterns of gas distribution in coal mines in North China. On the one hand, tectonic compression and shearing lead to stress concentration and thus deform the coal and reduce the coal seam permeability, further contributing to gas preservation. On the other hand, tectonic extension and rifting lead to stress release and thus improve the coal seam permeability, further contributing to gas emission. Therefore, the distribution zones of tectonic compression, ubiquitous coal deformation, and gas accumulation have been step-wisely revealed, and the coal-gas outburst proneness zones are finally identified. The proposed theory of step-wise tectonic control on gas occurrence is of practical significance for gas prediction and control.展开更多
Currently,both regulated and deregulated power trading exist in China’s power system,which has caused imbalanced funds in the electricity market.In this paper,a simulation analysis of the electricity market with wind...Currently,both regulated and deregulated power trading exist in China’s power system,which has caused imbalanced funds in the electricity market.In this paper,a simulation analysis of the electricity market with wind energy resources is conducted,and the calculation methods of unbalanced funds are investigated systematically.In detail,the calculation formulas of unbalanced funds are illustrated based on their definition,and a two-track electricity market clearing model is established.Firstly,the concept of the dual-track system is explained,and the specific calculation formulas of various types of unbalanced funds are provided.Next,considering the renewable energy consumption,the market clearing model based on DC power flow is constructed and solved;by combining fitting methods of mid-and long-term curves,the unbalanced funds are calculated based on clearing results and formulas.展开更多
As is well known, deep mines are hot. As mining depth increases, the temperature of the surrounding rock also increases. This seriously affects mine safety and production and has restricted the exploitation of deep co...As is well known, deep mines are hot. As mining depth increases, the temperature of the surrounding rock also increases. This seriously affects mine safety and production and has restricted the exploitation of deep coal resources. Therefore, reducing the working face temperature to improve working conditions by controlling these heat hazards is an urgent problem. Considering problems in cooling deep mines both domestically and abroad along with the actual conditions of the Zhangshuanglou coal mine, we propose a HEMS technology that uses heat resources from deep mines in a stepwise manner. HEMS means a high temperature ex-change machinery system. Mine inrush-water is used as a source of cooling. Twice the energy is extracted from the mine inrush water. Heat is used for building heating in the winter and cold water is used for cooling buildings in the summer. This opens a new technology for stepwise utilization of heat energy in deep mines. Energy conservation and reduced pollution, an improved environment and sustainable economic development are realized by this technique. The economic and social effects are obvious and illustrate a good prospect for the application and extension of the method.展开更多
Herein,a ternary supramolecular assembly(BPP-BQ?CB[8]-SCD)is successfully constructed by a bromophenylpyridine-tethered-bromoisoquinoline(BPP-BQ),cucurbit[8]uril(CB[8])and sulfonatedβ-cyclodextrin(SCD)via successive ...Herein,a ternary supramolecular assembly(BPP-BQ?CB[8]-SCD)is successfully constructed by a bromophenylpyridine-tethered-bromoisoquinoline(BPP-BQ),cucurbit[8]uril(CB[8])and sulfonatedβ-cyclodextrin(SCD)via successive assembling way,exhibiting progressively enhanced green roomtemperature phosphorescence(RTP).The self-aggregates of BPP-BQ?CB[8]-SCD accommodate an energy acceptor rhodamine B(Rh B)to form a light-harvesting system(BPP-BQ?CB[8]-SCD@Rh B)with further enhanced yellow long-lifetime luminescence with large Stokes shift based on triplet-singlet F?rster resonance energy transfer(TS-FRET).Crucially,the introduction of a photoactive diarylethene achieves the long-lived photoluminescence of BPP-BQ?CB[8]-SCD@Rh B to be switched with the efficiency of up to98%through logically ordered lowering/enhancing RTP performance of the energy donor and intercepting/restoring TS-FRET pathway,when stimulated by host-vip competition and light illumination in sequence.Moreover,BPP-BQ?CB[8]-SCD@Rh B is evenly doped into polyvinyl alcohol or polyacrylamide to obtain high-performance luminescent films with long afterglow.The abovementioned logically ordered stimulus-switched long-lived emission enables the light-harvesting system in both solution and solid state to be applied in high-security-level information encryption and transformation,and anticounterfeiting.展开更多
为提升高风电渗透率电网的频率稳定性与逐步惯性控制SIC参数自适应性,针对功率恢复阶段二次频率跌落的核心问题,采用变分自编码器与门控循环单元融合架构,提出一种结合灰狼优化算法样本生成、变分自编码器非线性特征提取与降噪、门控循...为提升高风电渗透率电网的频率稳定性与逐步惯性控制SIC参数自适应性,针对功率恢复阶段二次频率跌落的核心问题,采用变分自编码器与门控循环单元融合架构,提出一种结合灰狼优化算法样本生成、变分自编码器非线性特征提取与降噪、门控循环单元动态映射建模的风电调频优化控制方法。通过改进IEEE39节点系统构建仿真模型,验证所提方法的抑制效果与鲁棒性。结果表明:相较于传统智能方法,文中方法控制参数预测的关键误差指标最大降低53.3%,在5~25 d B噪声环境下综合性能指标稳定高于0.85,25%数据缺失场景下仍保持0.7以上评分,系统频率二次跌落幅度显著减小,为高比例风电并网系统提供了兼具自适应与抗干扰能力的调频解决方案。展开更多
Due to the complex conditions and strong heterogeneity of tight sandstone reservoirs,the reservoirs should be classified and the controlling factors of physical properties should be studied.Cast thin section observati...Due to the complex conditions and strong heterogeneity of tight sandstone reservoirs,the reservoirs should be classified and the controlling factors of physical properties should be studied.Cast thin section observations,cathodoluminescence,scanning electron microscopy(SEM),X-ray diffraction(XRD),and high-pressure mercury injection(HPMI)were used to classify and optimize the reservoir.The Brooks-Corey model and stepwise regression were used to study the fractal dimension and main controlling factors of the physical properties of the high-quality reservoir.The results show that the reservoirs in the study area can be divided into four types,and the high-quality reservoir has the best physical properties and pore-throat characteristics.In the high-quality reservoir,the homogeneity of transitional pores was the best,followed by that of micropores,and the worst was mesopores.The porosity was controlled by depth and kaolinite.The model with standardized coefficients is y=12.454−0.778×(Depth)+0.395×(Kaolinite).The permeability was controlled by depth,illite/montmorillonite,and siliceous cement,and the model with standardized coefficients is y=1.689−0.683×(Depth)−0.395×(Illite/Montmorillonite)−0.337×(Siliceous Cement).The pore-throat evolutionary model shows that the early-middle diagenetic period was when the reservoir physical properties were at their best,and the kaolinite intercrystalline pores and residual intergranular pores were the most important.展开更多
Perivascular delivery of therapeutic agents against established aetiologies for occlusive vascular remodelling has great therapeutic potential for vein graft failure.However,none of the perivascular drug delivery syst...Perivascular delivery of therapeutic agents against established aetiologies for occlusive vascular remodelling has great therapeutic potential for vein graft failure.However,none of the perivascular drug delivery systems tested experimentally have been translated into clinical practice.In this study,we established a novel strategy to locally and sustainably deliver the cyclin-dependent kinase 8/19 inhibitor Senexin A(SenA),an emerging drug candidate to treat occlusive vascular disease,using graphene oxide-hybridised hyaluronic acid-based hydrogels.We demonstrated an approach to accommodate SenA in hyaluronic acid-based hydrogels through utilising graphene oxide nanosheets allowing for non-covalent interaction with SenA.The resulting hydrogels produced sustained delivery of SenA over 21 days with tunable release kinetics.In vitro assays also demonstrated that the hydrogels were biocompatible.This novel graphene oxide-incorporated hyaluronic acid hydrogel offers an optimistic outlook as a perivascular drug delivery system for treating occlusive vascular diseases,such as vein graft failure.展开更多
基金financially supported by the Major Project of National Science and Technology of China(No.2011ZX05040-005)the Key Program of National Natural Science Foundation of China(No.51234005)+1 种基金the National Natural Science Foundation of China(No.41102094)the Changjiang Scholars and Innovative Research Team in University of China(No.IRT1235)
文摘To gain an understanding of gas occurrence, distribution is the fundamental basis for preventing gas disasters. Presently, how tectonic structures control gas occurrence remains problematic. This study proposes the theory and elucidates the mechanism of stepwise tectonic control on gas occurrence according to the characteristics of gas occurrence and the patterns of gas distribution in coal mines in North China. On the one hand, tectonic compression and shearing lead to stress concentration and thus deform the coal and reduce the coal seam permeability, further contributing to gas preservation. On the other hand, tectonic extension and rifting lead to stress release and thus improve the coal seam permeability, further contributing to gas emission. Therefore, the distribution zones of tectonic compression, ubiquitous coal deformation, and gas accumulation have been step-wisely revealed, and the coal-gas outburst proneness zones are finally identified. The proposed theory of step-wise tectonic control on gas occurrence is of practical significance for gas prediction and control.
基金supported by a grant from the fund:State Grid Inner Mongolia East Power Co.,Ltd.Science and Technology Project(SGMDTL00YWJS2200994).
文摘Currently,both regulated and deregulated power trading exist in China’s power system,which has caused imbalanced funds in the electricity market.In this paper,a simulation analysis of the electricity market with wind energy resources is conducted,and the calculation methods of unbalanced funds are investigated systematically.In detail,the calculation formulas of unbalanced funds are illustrated based on their definition,and a two-track electricity market clearing model is established.Firstly,the concept of the dual-track system is explained,and the specific calculation formulas of various types of unbalanced funds are provided.Next,considering the renewable energy consumption,the market clearing model based on DC power flow is constructed and solved;by combining fitting methods of mid-and long-term curves,the unbalanced funds are calculated based on clearing results and formulas.
基金Financial support for this project, provided by the National Basic Research Program of China (No. 2006CB202200)the National Major Project of Ministry of Education (No.304005) the Program for Changjiang Scholars and Innovative Research Team in University of China (No.IRT0656), is gratefully acknowledged
文摘As is well known, deep mines are hot. As mining depth increases, the temperature of the surrounding rock also increases. This seriously affects mine safety and production and has restricted the exploitation of deep coal resources. Therefore, reducing the working face temperature to improve working conditions by controlling these heat hazards is an urgent problem. Considering problems in cooling deep mines both domestically and abroad along with the actual conditions of the Zhangshuanglou coal mine, we propose a HEMS technology that uses heat resources from deep mines in a stepwise manner. HEMS means a high temperature ex-change machinery system. Mine inrush-water is used as a source of cooling. Twice the energy is extracted from the mine inrush water. Heat is used for building heating in the winter and cold water is used for cooling buildings in the summer. This opens a new technology for stepwise utilization of heat energy in deep mines. Energy conservation and reduced pollution, an improved environment and sustainable economic development are realized by this technique. The economic and social effects are obvious and illustrate a good prospect for the application and extension of the method.
基金the National Natural Science Foundation of China(Nos.21801063,22305070 and U20041101)the Top-Notch Talents Program of Henan Agricultural University(Nos.30501049 and 30501032)for financial support。
文摘Herein,a ternary supramolecular assembly(BPP-BQ?CB[8]-SCD)is successfully constructed by a bromophenylpyridine-tethered-bromoisoquinoline(BPP-BQ),cucurbit[8]uril(CB[8])and sulfonatedβ-cyclodextrin(SCD)via successive assembling way,exhibiting progressively enhanced green roomtemperature phosphorescence(RTP).The self-aggregates of BPP-BQ?CB[8]-SCD accommodate an energy acceptor rhodamine B(Rh B)to form a light-harvesting system(BPP-BQ?CB[8]-SCD@Rh B)with further enhanced yellow long-lifetime luminescence with large Stokes shift based on triplet-singlet F?rster resonance energy transfer(TS-FRET).Crucially,the introduction of a photoactive diarylethene achieves the long-lived photoluminescence of BPP-BQ?CB[8]-SCD@Rh B to be switched with the efficiency of up to98%through logically ordered lowering/enhancing RTP performance of the energy donor and intercepting/restoring TS-FRET pathway,when stimulated by host-vip competition and light illumination in sequence.Moreover,BPP-BQ?CB[8]-SCD@Rh B is evenly doped into polyvinyl alcohol or polyacrylamide to obtain high-performance luminescent films with long afterglow.The abovementioned logically ordered stimulus-switched long-lived emission enables the light-harvesting system in both solution and solid state to be applied in high-security-level information encryption and transformation,and anticounterfeiting.
文摘为提升高风电渗透率电网的频率稳定性与逐步惯性控制SIC参数自适应性,针对功率恢复阶段二次频率跌落的核心问题,采用变分自编码器与门控循环单元融合架构,提出一种结合灰狼优化算法样本生成、变分自编码器非线性特征提取与降噪、门控循环单元动态映射建模的风电调频优化控制方法。通过改进IEEE39节点系统构建仿真模型,验证所提方法的抑制效果与鲁棒性。结果表明:相较于传统智能方法,文中方法控制参数预测的关键误差指标最大降低53.3%,在5~25 d B噪声环境下综合性能指标稳定高于0.85,25%数据缺失场景下仍保持0.7以上评分,系统频率二次跌落幅度显著减小,为高比例风电并网系统提供了兼具自适应与抗干扰能力的调频解决方案。
基金financially supported by the National Natural Science Foundation of China(Nos.41972172 and U1910205).
文摘Due to the complex conditions and strong heterogeneity of tight sandstone reservoirs,the reservoirs should be classified and the controlling factors of physical properties should be studied.Cast thin section observations,cathodoluminescence,scanning electron microscopy(SEM),X-ray diffraction(XRD),and high-pressure mercury injection(HPMI)were used to classify and optimize the reservoir.The Brooks-Corey model and stepwise regression were used to study the fractal dimension and main controlling factors of the physical properties of the high-quality reservoir.The results show that the reservoirs in the study area can be divided into four types,and the high-quality reservoir has the best physical properties and pore-throat characteristics.In the high-quality reservoir,the homogeneity of transitional pores was the best,followed by that of micropores,and the worst was mesopores.The porosity was controlled by depth and kaolinite.The model with standardized coefficients is y=12.454−0.778×(Depth)+0.395×(Kaolinite).The permeability was controlled by depth,illite/montmorillonite,and siliceous cement,and the model with standardized coefficients is y=1.689−0.683×(Depth)−0.395×(Illite/Montmorillonite)−0.337×(Siliceous Cement).The pore-throat evolutionary model shows that the early-middle diagenetic period was when the reservoir physical properties were at their best,and the kaolinite intercrystalline pores and residual intergranular pores were the most important.
基金The work was supported by United States NIH under the award Nos.R01 GM136877(to QW,JF),R43 HL137525(to TC),R21 EB022131(to TC),P20 GM1090991(to TC),and R01 HL160541(to TC).
文摘Perivascular delivery of therapeutic agents against established aetiologies for occlusive vascular remodelling has great therapeutic potential for vein graft failure.However,none of the perivascular drug delivery systems tested experimentally have been translated into clinical practice.In this study,we established a novel strategy to locally and sustainably deliver the cyclin-dependent kinase 8/19 inhibitor Senexin A(SenA),an emerging drug candidate to treat occlusive vascular disease,using graphene oxide-hybridised hyaluronic acid-based hydrogels.We demonstrated an approach to accommodate SenA in hyaluronic acid-based hydrogels through utilising graphene oxide nanosheets allowing for non-covalent interaction with SenA.The resulting hydrogels produced sustained delivery of SenA over 21 days with tunable release kinetics.In vitro assays also demonstrated that the hydrogels were biocompatible.This novel graphene oxide-incorporated hyaluronic acid hydrogel offers an optimistic outlook as a perivascular drug delivery system for treating occlusive vascular diseases,such as vein graft failure.
