Fluid-structure interaction （FSI） problems in microchannels play a prominent role in many engineering applications. The present study is an effort toward the simulation of flow in microchannel considering FSI. The b...Fluid-structure interaction （FSI） problems in microchannels play a prominent role in many engineering applications. The present study is an effort toward the simulation of flow in microchannel considering FSI. The bottom boundary of the microchannel is simulated by size-dependent beam elements for the finite element method （FEM） based on a modified cou- ple stress theory. The lattice Boltzmann method （LBM） using the D2Q13 LB model is coupled to the FEM in order to solve the fluid part of the FSI problem. Because of the fact that the LBM generally needs only nearest neighbor information, the algorithm is an ideal candidate for parallel computing. The simulations are carried out on graphics processing units （GPUs） using computed unified device architecture （CUDA）. In the present study, the governing equations are non-dimensionalized and the set of dimensionless groups is exhibited to show their effects on micro-beam displacement. The numerical results show that the displacements of the micro-beam predicted by the size-dependent beam element are smaller than those by the classical beam element.展开更多
This paper compared the five different concepts of units of counting vocabulary which are tokens, types, word forms, lemmas and word families, and briefly touched upon how to choose appropriate unit of counting. After...This paper compared the five different concepts of units of counting vocabulary which are tokens, types, word forms, lemmas and word families, and briefly touched upon how to choose appropriate unit of counting. After that, three recognition/receptive vocabulary size tests were introduced.展开更多
Small-cell HSY-S zeolite prepared by the gas-phase ultra-stable method had been researched and developed,and industrial preparation tests of HSY-S have been successfully carried out for the first time.The acid resista...Small-cell HSY-S zeolite prepared by the gas-phase ultra-stable method had been researched and developed,and industrial preparation tests of HSY-S have been successfully carried out for the first time.The acid resistance of industrially prepared HSY-S was investigated by acid solutions with different pH values.The structures and properties of HSY-S and its acid-treated samples were characterized by XRD,XRF,BET,and IR.Results show that the HSY-S samples have the characteristics of high crystallinity,good stability,large specific surface area,and good acid resistance.展开更多
Radical copolymerization of acrylic acid(AA)with acrylamide(AM)or acrylamide/acrylonitrile(AM/AN)was initiated with ammonium persulfate as initiator to produce acrylic copolymers such as bicopolymer poly(AM-co-AA)and ...Radical copolymerization of acrylic acid(AA)with acrylamide(AM)or acrylamide/acrylonitrile(AM/AN)was initiated with ammonium persulfate as initiator to produce acrylic copolymers such as bicopolymer poly(AM-co-AA)and tercopolymer poly(AM-co-AN-co-AA)for revealing the effects of the structural units of the copolymers on the adhesion of the copolymers to polyester or cotton fibers for warp sizing.The adhesion was evaluated in terms of tensile strength and work-to-break of a roving impregnated with the copolymer solution.It was found that the adhesion strongly depended on type and amount of the units incorporated into the copolymeric chains.Whether the fiber is cotton or polyester,the adhesion of the bicopolymer poly(AM-co-AA)is greater than that of polyacrylic acid or polyacyamide.Excessively increasing the amount of AM or AA unit in poly(AM-co-AA)lowers the adhesion.To enhance the adhesion of the bicopolymer,a favorable mole ratio of AM to AA is 70/30.Based on this mole ratio,incorporation of acrylonitrile units into poly(AM-co-AA)to form tercopolymer enhances the adhesion.展开更多
This paper aims to present a case study that consists in the analysis of work effort per unit of software systems Development and Enhancement Projects (D&EP) depending on technological factors. That analysis was c...This paper aims to present a case study that consists in the analysis of work effort per unit of software systems Development and Enhancement Projects (D&EP) depending on technological factors. That analysis was commissioned by one of the largest public institutions in Poland. This is the COSMIC (Common Software Measurement International Consortium) function points method that is chosen by this institution as a point of reference for size of software systems developed/enhanced for supporting its functions and therefore this method is the base for the analysis of D&EP work effort per unit with regard to technological factors.展开更多
Based on the analysis of the basic characteristics of medium-and large-sized marine gas fields in Sichuan Basin, combined with the division of major reservoir forming geological units in the marine craton stage and th...Based on the analysis of the basic characteristics of medium-and large-sized marine gas fields in Sichuan Basin, combined with the division of major reservoir forming geological units in the marine craton stage and their control on key hydrocarbon accumulation factors, the distribution law of medium-and large-sized marine carbonate gas fields in the basin was examined and the exploration direction was pointed out. Through the analysis of the periodic stretching-uplifting background, it is concluded that five large scale paleo-rifts, three large scale paleo-uplifts, five large scale paleo erosion surfaces were formed in the marine craton stage of Sichuan Basin, and these geological units control the key reservoir forming factors of medium and large sized gas fields:(1) Large-scale paleo-rifts control the distribution of high-quality hydrocarbon generation centers.(2) The margin of large-scale paleo-rifts, high position of paleo-uplifts and paleo erosion surfaces control the distribution of high-quality reservoirs.(3) Large-scale paleo-rifts, paleo-uplifts, paleo erosion surfaces and present tectonic setting jointly control the formation of many types of large and medium-sized traps.(4) Natural gas accumulation is controlled by the inheritance evolution of traps in large geological units. Based on the comparative analysis of the distribution characteristics of medium-and large-sized gas fields and large geological units, it is proposed that the superimposition relationship between single or multiple geological units and the present structure controls the distribution of medium-and large-sized gas fields, and the "three paleo" superimposed area is the most advantageous. According to the above rules, the main exploration fields and directions of medium-and large-sized marine carbonate gas fields in Sichuan Basin include periphery of Deyang-Anyue paleo-rift, eastern margin of Longmenshan paleo-rift, margins of Kaijiang-Liangping oceanic trough and Chengkou-western Hubei oceanic trough, the high part of the subaqueous paleo-uplifts around Central Sichuan, paleo erosion surfaces of the top boundary of Maokou Formation in eastern and southern Sichuan Basin, paleo erosion surfaces of the top boundary of the Leikoupo Formation in central and western Sichuan Basin.展开更多
明确不同作业类型渔船最少调查样本量对收集高质量的渔获量数据至关重要。本研究根据2008―2018年南海北部渔港抽样调查获得的36499个生产航次数据,基于蓝圆鲹(Decapterus maruadsi)单位捕捞努力量渔获量(catch per unit effort,CPUE),...明确不同作业类型渔船最少调查样本量对收集高质量的渔获量数据至关重要。本研究根据2008―2018年南海北部渔港抽样调查获得的36499个生产航次数据,基于蓝圆鲹(Decapterus maruadsi)单位捕捞努力量渔获量(catch per unit effort,CPUE),采用计算机模拟重抽样方法,对5种作业类型(单拖网、双拖网、光诱围网、刺网和光诱罩网)的调查样本量进行优化,使用相对估计误差(REE)和相对偏差(RB)作为评价指标,分析调查样本量的变化对CPUE估值的影响。结果显示,CPUE在不同作业类型间差异明显,同种作业类型在不同季节亦存在差异,其中,光诱围网四季CPUE同比高于其他作业类型,CPUE变化范围为(1.714~4.984)kg/(kW·d)。单拖网、双拖网和光诱罩网宜以REE≤10%确定最少样本量,而刺网和光诱围网(除冬季外)则宜以REE≤5%确定最少样本量,各作业类型最少样本量四季不同,其中,单拖网平均为76航次,双拖网平均为54航次,刺网平均为218航次,光诱围网平均为101航次,光诱罩网为72航次。当样本量达到特定值时,REE和RB的变化趋于稳定,冗余样本量减少也能够在一定程度上保证估计精度。本研究可为渔获量调查捕捞信息船样本量优化提供科学参考。展开更多
Focusing on the Zengmu-Beikang Basin in the southern South China Sea,we summarized the regional sequence stratigraphic framework and identified mass-transport complex(MTC)that had developed since the Late Miocene(10.5...Focusing on the Zengmu-Beikang Basin in the southern South China Sea,we summarized the regional sequence stratigraphic framework and identified mass-transport complex(MTC)that had developed since the Late Miocene(10.5 Ma),by using high-resolution multibeam bathymetric and 2D seismic datasets.Based on the analysis of high amplitude and continuous seismic reflections within the mass-transport deposits(MTDs),we identified 14 basal shear surfaces(BSS)and divided the MTC into 14 units(MTD1–MTD14 from the youngest to the oldest in numerical order).Two types of seismic facies and five seismic features within the MTDs were recognized,including chaotic and transparent facies(debris flow),chaotic and semi-transparent facies(debris flow),thrust-fold systems,blocks,escarpments,pressure ridges,and normal faults.Analysis of the depositional area,frequency,and vertical extent of the escarpments of the fourteen MTD units revealed their variations in dimensions.Specifically,MTD14–MTD4 exhibited a gradual increase in the size of the deposition unit,with larger-sized MTD7–MTD4;while MTD3–MTD1 showed a gradual decrease in the size.The evolution of the MTDs in the study area is primarily controlled by several factors,including erosion of mass-movement processes(e.g.,slide,slump,and mass flows),sea-level fluctuation and sediment supply,tectonic activity,development of mud diapirs,and topographic influence.It is also plausible that the large-sized MTD7–MTD4 might be formed in the Pliocene due to steep slope gradient and instability caused by the development of mud diapirs,whereas in the Quaternary,the influence of mud diapirs in the shallow strata diminished,and smaller-sized MTD3–MTD1 were formed.展开更多
文摘Fluid-structure interaction （FSI） problems in microchannels play a prominent role in many engineering applications. The present study is an effort toward the simulation of flow in microchannel considering FSI. The bottom boundary of the microchannel is simulated by size-dependent beam elements for the finite element method （FEM） based on a modified cou- ple stress theory. The lattice Boltzmann method （LBM） using the D2Q13 LB model is coupled to the FEM in order to solve the fluid part of the FSI problem. Because of the fact that the LBM generally needs only nearest neighbor information, the algorithm is an ideal candidate for parallel computing. The simulations are carried out on graphics processing units （GPUs） using computed unified device architecture （CUDA）. In the present study, the governing equations are non-dimensionalized and the set of dimensionless groups is exhibited to show their effects on micro-beam displacement. The numerical results show that the displacements of the micro-beam predicted by the size-dependent beam element are smaller than those by the classical beam element.
文摘This paper compared the five different concepts of units of counting vocabulary which are tokens, types, word forms, lemmas and word families, and briefly touched upon how to choose appropriate unit of counting. After that, three recognition/receptive vocabulary size tests were introduced.
基金The authors gratefully acknowledge the funding of the project by SINOPEC(No.118001-6).
文摘Small-cell HSY-S zeolite prepared by the gas-phase ultra-stable method had been researched and developed,and industrial preparation tests of HSY-S have been successfully carried out for the first time.The acid resistance of industrially prepared HSY-S was investigated by acid solutions with different pH values.The structures and properties of HSY-S and its acid-treated samples were characterized by XRD,XRF,BET,and IR.Results show that the HSY-S samples have the characteristics of high crystallinity,good stability,large specific surface area,and good acid resistance.
基金Open Research Foundation of "Anhui Key Laboratory of Textile Materials",China(No.2006F2003)
文摘Radical copolymerization of acrylic acid(AA)with acrylamide(AM)or acrylamide/acrylonitrile(AM/AN)was initiated with ammonium persulfate as initiator to produce acrylic copolymers such as bicopolymer poly(AM-co-AA)and tercopolymer poly(AM-co-AN-co-AA)for revealing the effects of the structural units of the copolymers on the adhesion of the copolymers to polyester or cotton fibers for warp sizing.The adhesion was evaluated in terms of tensile strength and work-to-break of a roving impregnated with the copolymer solution.It was found that the adhesion strongly depended on type and amount of the units incorporated into the copolymeric chains.Whether the fiber is cotton or polyester,the adhesion of the bicopolymer poly(AM-co-AA)is greater than that of polyacrylic acid or polyacyamide.Excessively increasing the amount of AM or AA unit in poly(AM-co-AA)lowers the adhesion.To enhance the adhesion of the bicopolymer,a favorable mole ratio of AM to AA is 70/30.Based on this mole ratio,incorporation of acrylonitrile units into poly(AM-co-AA)to form tercopolymer enhances the adhesion.
文摘This paper aims to present a case study that consists in the analysis of work effort per unit of software systems Development and Enhancement Projects (D&EP) depending on technological factors. That analysis was commissioned by one of the largest public institutions in Poland. This is the COSMIC (Common Software Measurement International Consortium) function points method that is chosen by this institution as a point of reference for size of software systems developed/enhanced for supporting its functions and therefore this method is the base for the analysis of D&EP work effort per unit with regard to technological factors.
基金Supported by the China National Science and Technology Major Project(2016ZX05007004,2016ZX05004005)
文摘Based on the analysis of the basic characteristics of medium-and large-sized marine gas fields in Sichuan Basin, combined with the division of major reservoir forming geological units in the marine craton stage and their control on key hydrocarbon accumulation factors, the distribution law of medium-and large-sized marine carbonate gas fields in the basin was examined and the exploration direction was pointed out. Through the analysis of the periodic stretching-uplifting background, it is concluded that five large scale paleo-rifts, three large scale paleo-uplifts, five large scale paleo erosion surfaces were formed in the marine craton stage of Sichuan Basin, and these geological units control the key reservoir forming factors of medium and large sized gas fields:(1) Large-scale paleo-rifts control the distribution of high-quality hydrocarbon generation centers.(2) The margin of large-scale paleo-rifts, high position of paleo-uplifts and paleo erosion surfaces control the distribution of high-quality reservoirs.(3) Large-scale paleo-rifts, paleo-uplifts, paleo erosion surfaces and present tectonic setting jointly control the formation of many types of large and medium-sized traps.(4) Natural gas accumulation is controlled by the inheritance evolution of traps in large geological units. Based on the comparative analysis of the distribution characteristics of medium-and large-sized gas fields and large geological units, it is proposed that the superimposition relationship between single or multiple geological units and the present structure controls the distribution of medium-and large-sized gas fields, and the "three paleo" superimposed area is the most advantageous. According to the above rules, the main exploration fields and directions of medium-and large-sized marine carbonate gas fields in Sichuan Basin include periphery of Deyang-Anyue paleo-rift, eastern margin of Longmenshan paleo-rift, margins of Kaijiang-Liangping oceanic trough and Chengkou-western Hubei oceanic trough, the high part of the subaqueous paleo-uplifts around Central Sichuan, paleo erosion surfaces of the top boundary of Maokou Formation in eastern and southern Sichuan Basin, paleo erosion surfaces of the top boundary of the Leikoupo Formation in central and western Sichuan Basin.
文摘明确不同作业类型渔船最少调查样本量对收集高质量的渔获量数据至关重要。本研究根据2008―2018年南海北部渔港抽样调查获得的36499个生产航次数据,基于蓝圆鲹(Decapterus maruadsi)单位捕捞努力量渔获量(catch per unit effort,CPUE),采用计算机模拟重抽样方法,对5种作业类型(单拖网、双拖网、光诱围网、刺网和光诱罩网)的调查样本量进行优化,使用相对估计误差(REE)和相对偏差(RB)作为评价指标,分析调查样本量的变化对CPUE估值的影响。结果显示,CPUE在不同作业类型间差异明显,同种作业类型在不同季节亦存在差异,其中,光诱围网四季CPUE同比高于其他作业类型,CPUE变化范围为(1.714~4.984)kg/(kW·d)。单拖网、双拖网和光诱罩网宜以REE≤10%确定最少样本量,而刺网和光诱围网(除冬季外)则宜以REE≤5%确定最少样本量,各作业类型最少样本量四季不同,其中,单拖网平均为76航次,双拖网平均为54航次,刺网平均为218航次,光诱围网平均为101航次,光诱罩网为72航次。当样本量达到特定值时,REE和RB的变化趋于稳定,冗余样本量减少也能够在一定程度上保证估计精度。本研究可为渔获量调查捕捞信息船样本量优化提供科学参考。
基金Supported by the Guangzhou Marine Geology Survey,China Geological Survey(No.DD 20160155)。
文摘Focusing on the Zengmu-Beikang Basin in the southern South China Sea,we summarized the regional sequence stratigraphic framework and identified mass-transport complex(MTC)that had developed since the Late Miocene(10.5 Ma),by using high-resolution multibeam bathymetric and 2D seismic datasets.Based on the analysis of high amplitude and continuous seismic reflections within the mass-transport deposits(MTDs),we identified 14 basal shear surfaces(BSS)and divided the MTC into 14 units(MTD1–MTD14 from the youngest to the oldest in numerical order).Two types of seismic facies and five seismic features within the MTDs were recognized,including chaotic and transparent facies(debris flow),chaotic and semi-transparent facies(debris flow),thrust-fold systems,blocks,escarpments,pressure ridges,and normal faults.Analysis of the depositional area,frequency,and vertical extent of the escarpments of the fourteen MTD units revealed their variations in dimensions.Specifically,MTD14–MTD4 exhibited a gradual increase in the size of the deposition unit,with larger-sized MTD7–MTD4;while MTD3–MTD1 showed a gradual decrease in the size.The evolution of the MTDs in the study area is primarily controlled by several factors,including erosion of mass-movement processes(e.g.,slide,slump,and mass flows),sea-level fluctuation and sediment supply,tectonic activity,development of mud diapirs,and topographic influence.It is also plausible that the large-sized MTD7–MTD4 might be formed in the Pliocene due to steep slope gradient and instability caused by the development of mud diapirs,whereas in the Quaternary,the influence of mud diapirs in the shallow strata diminished,and smaller-sized MTD3–MTD1 were formed.
