期刊文献+
共找到1,166篇文章
< 1 2 59 >
每页显示 20 50 100
Values of macular ganglion cell-inner plexiform layer and 10-2 visual field measurements in detecting and evaluating glaucoma
1
作者 Hai-Jian Hu Ping Li +7 位作者 Bin Tong Yu-Lian Pang Hong-Dou Luo Fei-Fei Wang Chan Xiong Yu-Lin Yu Hai He Xu Zhang 《International Journal of Ophthalmology(English edition)》 SCIE CAS 2024年第5期852-860,共9页
AIM:To assess the performance of macular ganglion cell-inner plexiform layer thickness(mGCIPLT)and 10-2 visual field(VF)parameters in detecting early glaucoma and evaluating the severity of advanced glaucoma.METHODS:T... AIM:To assess the performance of macular ganglion cell-inner plexiform layer thickness(mGCIPLT)and 10-2 visual field(VF)parameters in detecting early glaucoma and evaluating the severity of advanced glaucoma.METHODS:Totally 127 eyes from 89 participants(36 eyes of 19 healthy participants,45 eyes of 31 early glaucoma patients and 46 eyes of 39 advanced glaucoma patients)were included.The relationships between the optical coherence tomography(OCT)-derived parameters and VF sensitivity were determined.Patients with early glaucoma were divided into eyes with or without central 10°of the VF damages(CVFDs),and the diagnostic performances of OCT-derived parameters were assessed.RESULTS:In early glaucoma,the mGCIPLT was significantly correlated with 10-2 VF pattern standard deviation(PSD;with average mGCIPLT:β=-0.046,95%CI,-0.067 to-0.024,P<0.001).In advanced glaucoma,the mGCIPLT was related to the 24-2 VF mean deviation(MD;with average mGCIPLT:β=0.397,95%CI,0.199 to 0.595,P<0.001),10-2 VF MD(with average mGCIPLT:β=0.762,95%CI,0.485 to 1.038,P<0.001)and 24-2 VF PSD(with average mGCIPLT:β=0.244,95%CI,0.124 to 0.364,P<0.001).Except for the minimum and superotemporal mGCIPLT,the decrease of mGCIPLT in early glaucomatous eyes with CVFDs was more severe than that of early glaucomatous eyes without CVFDs.The area under the curve(AUC)of the average mGCIPLT(AUC=0.949,95%CI,0.868 to 0.982)was greater than that of the average circumpapillary retinal nerve fiber layer thickness(cpRNFLT;AUC=0.827,95%CI,0.674 to 0.918)and rim area(AUC=0.799,95%CI,0.610 to 0.907)in early glaucomatous eyes with CVFDs versus normal eyes.CONCLUSION:The 10-2 VF and mGCIPLT parameters are complementary to 24-2 VF,cpRNFLT and ONH parameters,especially in detecting early glaucoma with CVFDs and evaluating the severity of advanced glaucoma in group level. 展开更多
关键词 10-2 visual field ganglion cell-inner plexiform layer retinal nerve fiber layer thickness GLAUCOMA
下载PDF
Investigation of the oil-seawater mixed flow under an electromagnetic field 被引量:2
2
作者 Aiwu Peng Lingzhi Zhao +5 位作者 Xiaoqiang Chen Qingfan Zhang Ciwen Sha Jianping Zhao Ran Li Zhaolian Wang 《Acta Oceanologica Sinica》 SCIE CAS CSCD 2019年第7期14-21,共8页
The electromagnetic separation method is a new approach to treat ship-based marine oily wastewater,in which oil droplets are dispersed in seawater(oil-seawater mixed flow).In order to clarify the separation process an... The electromagnetic separation method is a new approach to treat ship-based marine oily wastewater,in which oil droplets are dispersed in seawater(oil-seawater mixed flow).In order to clarify the separation process and determine the separation characteristics,the flow field and volume fraction of the oil droplets of the oil-seawater mixed flow under an applied electromagnetic field with different operating conditions were investigated by 2D numerical simulations with the Eulerian model.The results show that:(1)the downward Lorentz force causes seawater to flow downwards and the oil droplets to move upwards due to the electromagnetic separation force in the effective section of the separation channel;(2)the volume fraction of the oil droplets at the top of the outlet section increases with the current density,magnetic field,and the diameter of the oil droplet and decreases with the inlet velocity of the oily seawater.The results provide useful guidance for the design of electromagnetic separation devices of the oil-seawater mixed flow. 展开更多
关键词 oil-seawater mixed FLOW ELECTROMAGNETIC field oil-seawater separation MARINE OIL POLLUTION
下载PDF
Mathematical Modeling,Field Calibration and Numerical Simulation of Low-Speed Mixed Traffic Flow in Cities 被引量:1
3
作者 Doctoral Candidate: Feng SuweiAdvisor: Prof. Dai Shiqiang 《Advances in Manufacturing》 SCIE CAS 1998年第2期86-88,共3页
Withtherapiddevelopmentoftransportationandautomobileindustry,theconflictbetweenmotormanufactureandhighwaycon... Withtherapiddevelopmentoftransportationandautomobileindustry,theconflictbetweenmotormanufactureandhighwayconstructionbecomess... 展开更多
关键词 low speed mixed traffic flow in cities mathematical modeling numerical simulation field calibration vehicular parking traffic light control
下载PDF
The mixed-spins 1/2 and 3/2 Blume-Capel model with a random crystal field
4
作者 Erhan Albayrak 《Chinese Physics B》 SCIE EI CAS CSCD 2012年第6期485-489,共5页
The random crystal field (RCF) effects are investigated on the phase diagrams of the mixed-spins 1/2 and 3/2 Blume-Capel (BC) model on the Bethe lattice. The bimodal random crystal field is assumed and the recursi... The random crystal field (RCF) effects are investigated on the phase diagrams of the mixed-spins 1/2 and 3/2 Blume-Capel (BC) model on the Bethe lattice. The bimodal random crystal field is assumed and the recursion relations are employed for the solution of the model. The system gives only the second-order phase transitions for all values of the crystal fields in the non-random bimodal distribution for given probability. The randomness does not change the order of the phase transitions for higher crystal field values, i.e., it is always second-order, but it may introduce first-order phase transitions at lower negative crystal field values for the probability in the range about 0.20 and 0.45, which is only the second-order for the non-random case in this range. Thus our work claims that randomness may be used to induce first-order phase transitions at lower negative crystal field values at lower probabilities. 展开更多
关键词 RANDOMNESS crystal field Bethe lattice mixed spin BIMODAL
下载PDF
Random crystal field effect on hysteresis loops and compensation behavior of mixed spin-(1,3/2) Ising system
5
作者 K Htoutou Y Benhouria +2 位作者 A Oubelkacem R Ahl laamara L B Drissi 《Chinese Physics B》 SCIE EI CAS CSCD 2017年第12期538-547,共10页
Magnetic hysteresis and compensation behavior of a mixed spin-(1, 3/2) Ising model on a square lattice are investigated in the framework of effective field theory based on a probability distribution technique. The e... Magnetic hysteresis and compensation behavior of a mixed spin-(1, 3/2) Ising model on a square lattice are investigated in the framework of effective field theory based on a probability distribution technique. The effect of random crystal field, ferromagnetic and ferrimagnetic exchange interaction on hysteresis loops and compensation phenomenon are discussed. A number of characteristic phenomena have been reported such as the observation of triple hysteresis loops at low temperatures and for negative values of random crystal field. Critical and double compensation temperatures have been also found. The obtained results are also compared to some previous works. 展开更多
关键词 ferrimagnetic mixed Ising system effective field theory hysteresis loops compensation behaviors
下载PDF
Mean-Field Studies of a Mixed Spin-3/2 and Spin-2 and a Mixed Spin-3/2 and Spin-5/2 Ising System with Different Anisotropies
6
作者 WEI Guo-Zhu MIAO Hai-Ling 《Communications in Theoretical Physics》 SCIE CAS CSCD 2009年第4期756-760,共5页
混合 spin-3/2 和混合 spin-3/2 和 spin-5/2 Ising 的磁性有不同 anisotropies 的铁磁性的系统借助于吝啬地的理论(MFT ) 被学习。单个离子的 anisotropy 力量上的阶段图的依赖也被学习。在混合 spin-3/2 和 spin-2 Ising 模型,除秒... 混合 spin-3/2 和混合 spin-3/2 和 spin-5/2 Ising 的磁性有不同 anisotropies 的铁磁性的系统借助于吝啬地的理论(MFT ) 被学习。单个离子的 anisotropy 力量上的阶段图的依赖也被学习。在混合 spin-3/2 和 spin-2 Ising 模型,除秒顺序阶段转变以外,第一顺序混乱阶段转变和 tricritical 线被发现。在混合 spin-3/2 和 spin-5/2 Ising 模型,没有一阶的转变和 tricritical 线。 展开更多
关键词 单离子各向异性 混合自旋 平均场理论 伊辛系统 ISING模型 二阶相变 遗传系统 磁性能
下载PDF
Longitudinal-Random-Field Mixed Ising Model with Arbitrary Spins
7
作者 梁雅秋 魏国柱 +1 位作者 徐晓娟 宋国利 《Communications in Theoretical Physics》 SCIE CAS CSCD 2010年第5期957-962,共6页
混合 Ising 模型由任意的纺纱组成珍视的 longitudinal-random-field 被一个有效领域理论的使用与关联(水蜥) 学习了。有混合旋转的系统的阶段图:= 1/2, S = 1;= 1/2, S = 3/2 被阴谋。不仅在 T = 的断绝 0 K,当纵的领域是 trimod... 混合 Ising 模型由任意的纺纱组成珍视的 longitudinal-random-field 被一个有效领域理论的使用与关联(水蜥) 学习了。有混合旋转的系统的阶段图:= 1/2, S = 1;= 1/2, S = 3/2 被阴谋。不仅在 T = 的断绝 0 K,当纵的领域是 trimodal 时,被发现散布了,而且 tricritical 行为在在 bimodal 和纵的领域的 trimodal 分布之间的这些阶段图被观察,它与单个纺纱的不同。tricritical 点的外观独立于协作数字和旋转价值。 展开更多
关键词 混合自旋系统 伊辛模型 随机场 旋转 有效场理论 自旋值 纵向分布 配位数
下载PDF
Critical Properties of Mixed Ising Spin System with Different Trimodal Transverse Fields in the Presence of Single-Ion Anisotropy
8
作者 CHEN Qiang YAN Shi-Lei 《Communications in Theoretical Physics》 SCIE CAS CSCD 2006年第6期1131-1136,共6页
在有效的地近似,效果 ofsingle 离子 anisotropy 和不同 trimodal 的框架以内,混合 spin-1/2 和 spin-1 Ising 系统的批评性质上的二个潜水艇格子的横向的地在简单立方的格子上被调查。更小的单个离子的 anisotropy 能放大阶段和一个... 在有效的地近似,效果 ofsingle 离子 anisotropy 和不同 trimodal 的框架以内,混合 spin-1/2 和 spin-1 Ising 系统的批评性质上的二个潜水艇格子的横向的地在简单立方的格子上被调查。更小的单个离子的 anisotropy 能放大阶段和一个更大的阶段能压抑磁性的订的磁性的订在低温度为 T- Ω _(1/2 ) 分阶段执行空间,当更小的 single-ionanisotropy 几乎不能改变价值时批评横向为 T- Ω _ 成立了 1 个空格。在另一方面,二不同 trimodal 影响 tricritical 点和磁性的订阶段上的集中在 T-D 空间在一些有趣的结果上拿的横向的 Selds。主要原因来自单个离子的 anisotropy,不同的横向的地和二 trimodaldistributions 的普通行动。 展开更多
关键词 临界性 混合自旋系统 三角形式横断场 单离子各向异性
下载PDF
Note on Energy-Momentum Tensor for General Mixed Tensor-Spinor Fields
9
作者 ZHANG Hong-Bao 《Communications in Theoretical Physics》 SCIE CAS CSCD 2005年第6X期1007-1010,共4页
This note provides an explicit proof of the equivalence of Belinfante's energy-momentum tensor and metric energy-momentum tensor for general mixed tensor-spinor fields.
关键词 Belinfante能量-动量张量 能量-动量张量度量 一般张量旋量域 等价性 动力学
下载PDF
A new two-mode thermo- and squeezing-mixed optical field
10
作者 周军 范洪义 宋军 《Chinese Physics B》 SCIE EI CAS CSCD 2017年第7期27-30,共4页
We propose a new two-mode thermo-and squeezing-mixed optical field, described by the new density operator ρ=1-e^f-|g|^2 e^ga^+b^+e^fa^+a|0〉 f_(bb) 〈0| e^(g*ab), where |0〉_(bb) 〈0| is the b-mode va... We propose a new two-mode thermo-and squeezing-mixed optical field, described by the new density operator ρ=1-e^f-|g|^2 e^ga^+b^+e^fa^+a|0〉 f_(bb) 〈0| e^(g*ab), where |0〉_(bb) 〈0| is the b-mode vacuum, e ^fa^+arepresents the thermo-field, and e^ga^+b^+ indicates squeezing. The photon statistics for ρ is studied by virtue of the method of integration within ordered product(IWOP) of operators. Such a field can be generated when a two-mode squeezed state passes through a one-mode dissipation channel. 展开更多
关键词 thermo-and squeezing-mixing new optical field photon statistics integration within ordered product(IWOP) method
下载PDF
MIXED-GRAINED CMOS FIELD PROGRAMMABLE ANALOG ARRAY FOR SMART SENSORY APPLICATIONS
11
作者 Cheng Xiaoyan Yang Haigang +3 位作者 Yin Tao Wu Qisong Zhi Tian Liu Fei 《Journal of Electronics(China)》 2014年第2期129-142,共14页
The drive towards shorter design cycles for analog integrated circuits has given impetus to the development of Field Programmable Analog Arrays(FPAAs),which are the analogue counterparts of Field Programmable Gate Arr... The drive towards shorter design cycles for analog integrated circuits has given impetus to the development of Field Programmable Analog Arrays(FPAAs),which are the analogue counterparts of Field Programmable Gate Arrays(FPGAs).In this paper,we present a new design methodology which using FPAA as a powerful analog front-end processing platform in the smart sensory microsystem.The proposed FPAA contains 16 homogeneous mixed-grained Configurable Analog Blocks(CABs) which house a variety of processing elements especially the proposed fine-grained Core Configurable Amplifiers(CCAs).The high flexible CABs allow the FPAA operating in both continuous-time and discrete-time approaches suitable to support variety of sensors.To reduce the nonideal parasitic effects and save area,the fat-tree interconnection network is adopted in this FPAA.The functionality of this FPAA is demonstrated through embedding of voltage and capacitive sensor signal readout circuits and a configurable band pass filter.The minimal detectable voltage and capacitor achieves 38 uV and 8.3 aF respectively within 100 Hz sensor bandwidth.The power consumption comparison of CCA in three applications shows that the FPAA has high power efficiency.And the simulation results also show that the FPAA has good tolerance with wide PVT variations. 展开更多
关键词 field Programmable Gate Array(FPGA) field Programmable Analog Array(FPAA) Sensor mixed-grained Configurable Analog Block(CAB) Correlated Double Sampling(CDS)
下载PDF
Phase diagrams in mixed spin-3/2 and spin-2 Ising system with two alternative layers within the effective-field theory
12
作者 Bayram Deviren Yasin Polat Mustafa Keskin 《Chinese Physics B》 SCIE EI CAS CSCD 2011年第6期112-124,共13页
The phase diagrams in the mixed spin-3/2 and spin-2 Ising system with two alternative layers on a honeycomb lattice are investigated and discussed by the use of the effective-field theory with correlations. The intera... The phase diagrams in the mixed spin-3/2 and spin-2 Ising system with two alternative layers on a honeycomb lattice are investigated and discussed by the use of the effective-field theory with correlations. The interaction of the nearest-neighbour spins of each layer is taken to be positive (ferromagnetic interaction) and the interaction of the adjacent spins of the nearest-neighbour layers is considered to be either positive or negative (ferromagnetic or antiferromagnetic interaction). The temperature dependence of the layer magnetizations of the system is examined to characterize the nature (continuous or discontinuous) of the phase transitions and obtain the phase transition temperatures. The system exhibits both second- and first-order phase transitions besides triple point (TP), critical end point (E), multicritical point (A), isolated critical point (C) and reentrant behaviour depending on the interaction parameters. We have also studied the temperature dependence of the total magnetization to find the compensation points, as well as to determine the type of behaviour, and N-type behaviour in Neel classification nomenclature existing in the system. The phase diagrams are constructed in eight different planes and it is found that the system also presents the compensation phenomena depending on the sign of the bilinear exchange interactions. 展开更多
关键词 mixed spin-3/2 and spin-2 Ising system effective-field theory compensation phenomena phase diagrams
下载PDF
Evaluation of Behavior of Evacuees on a Floor in a Disaster Situation Using Multi-agent Simulation and Mixed Reality Game: Effectiveness of the Field of Vision and Priority of Referred Objects
13
作者 Keita Sugiura Masahiro Arakawa 《Computer Technology and Application》 2016年第5期227-235,共9页
下载PDF
饱和地基水泥土复合桩近场主动隔振的BEM-FEM耦合分析
14
作者 时刚 郜新军 张浩 《振动与冲击》 EI CSCD 北大核心 2024年第1期252-264,282,共14页
人工振动污染是当前城市发展过程中面临的一个难题,单排或多排桩是人工振动污染防治的一种重要方式。传统基桩施工容易造成泥浆污染、振动等各种负面环境问题,而水泥土复合桩是一种低振动、低噪声、无挤土、少排泥浆的新型基桩,特别适... 人工振动污染是当前城市发展过程中面临的一个难题,单排或多排桩是人工振动污染防治的一种重要方式。传统基桩施工容易造成泥浆污染、振动等各种负面环境问题,而水泥土复合桩是一种低振动、低噪声、无挤土、少排泥浆的新型基桩,特别适合在城区构建排桩屏障。针对饱和地基中单排水泥土复合桩的近场主动隔振问题,建立了动力机器基础环境振动影响的半解析BEM方程;在此基础上,分别采用半解析BEM对饱和地基、FEM对水泥土复合桩进行建模,根据饱和地基-水泥土桩接触面的平衡和相容条件,建立了水泥土复合桩近场主动隔振的半解析BEM-FEM耦合方程,给出了耦合方程稀疏矩阵的存储策略,并对单排水泥土复合桩的近场主动隔振效果进行了计算分析。研究结果表明:单排水泥土复合桩能够有效地对动力机器基础引起环境振动进行隔振;等长芯桩复合桩的隔振效果要优于短芯桩。单排水泥土复合桩的隔振效果随着桩数的增加而逐渐提高;较小桩间距并不一定取得更好的隔振效果,建议相邻桩桩间净距取2.0~2.5λ_(R)(Rayleigh波波长)。随着单排水泥土复合桩距振源距离的增加,屏障隔振效果逐渐降低,但降低幅度相对较小。此外,对水泥土复合桩而言,当内插预制桩的外轮廓尺寸相同时,预制芯桩型式对水泥土复合桩隔振效果影响相对较小,可根据实际工程条件选择合适的芯桩类型。 展开更多
关键词 饱和地基 水泥土复合桩 近场主动隔振 隔振效果 半解析BEM-FEM
下载PDF
西昆仑碰撞后钾质火山岩岩浆作用过程--以普鲁和康西瓦火山群为例
15
作者 丁冉 栾鹏 +4 位作者 于红梅 魏费翔 赵波 杨文健 许建东 《地震地质》 EI CSCD 北大核心 2024年第2期312-335,共24页
西昆仑处于青藏高原西北缘,该地区岩浆活动强烈,形成了多个大小、规模不等的碰撞后钾质火山岩群,但这些钾质火山岩的岩浆作用过程依然不清晰。为了研究西昆仑地区的岩浆作用过程,文中选取了该区域的普鲁和康西瓦火山群作为研究对象,对... 西昆仑处于青藏高原西北缘,该地区岩浆活动强烈,形成了多个大小、规模不等的碰撞后钾质火山岩群,但这些钾质火山岩的岩浆作用过程依然不清晰。为了研究西昆仑地区的岩浆作用过程,文中选取了该区域的普鲁和康西瓦火山群作为研究对象,对其火山岩进行了全岩主量元素含量、斑晶结构和成分分析,以及晶体大小分布(CSD)和岩浆结晶温压条件研究。结果表明,尽管两地的岩浆具有相似的源区,但这2个火山群的岩石类型和矿物组成存在显著差异。普鲁火山岩为一套粗安岩和玄武粗安岩的组合,斑晶由斜长石、橄榄石、单斜辉石和少量斜方辉石构成;康西瓦火山岩主要为响岩质碱玄岩,斑晶矿物为单斜辉石、黑云母和少量橄榄石及斜长石。结合斑晶结构、环带成分和CSD曲线形态分析认为,普鲁火山岩经历了不同演化程度的岩浆混合;而康西瓦火山岩仅发生了岩浆自混,且减压造成了斑晶的大量熔蚀。矿物-熔体平衡温压计计算表明,普鲁火山岩的平衡温度为1036~1218℃,平衡压力为5.1~9.9kbar,对应的深度为19.4~37.3km;康西瓦火山岩的平衡温度为1154~1282℃,平衡压力为1.2~11.6kbar,对应深度为4.3~43.7km。康西瓦地区的平衡压力变化范围较大,可能与所处的断裂带有关。文中定量化研究了西昆仑地区的后碰撞钾质火山岩的岩浆作用过程,补充了以往对该区域火山岩中斑晶CSD的研究,揭示了岩浆在地壳岩浆储库内的运移和演化过程,为青藏高原西北缘及其周边地区的火山活动研究提供了重要信息。 展开更多
关键词 显微结构 晶体大小分布 岩浆混合 普鲁火山群 康西瓦火山群 西昆仑火山区
下载PDF
A novel thermoregulated phosphine ligand used for the Rh-catalyzed hydroformylation of mixed C_(11-12) olefins in aqueous/organic biphasic system 被引量:2
16
作者 Zhi Jiang Ji,Jing Yang Jiang,Yan Hua Wang State Key Laboratory of Fine Chemicals,Dalian University of Technology,Dalian 116012,China 《Chinese Chemical Letters》 SCIE CAS CSCD 2010年第5期515-518,共4页
A novel thermoregulated phosphine ligand PhP(CHCHO)CH(n=22) was synthesized and used for the Rh-catalyzed hydroformylation of mixed Colefins in aqueous/organic biphasic system.Under the optimized conditions,pressure =... A novel thermoregulated phosphine ligand PhP(CHCHO)CH(n=22) was synthesized and used for the Rh-catalyzed hydroformylation of mixed Colefins in aqueous/organic biphasic system.Under the optimized conditions,pressure =5 MPa (H:CO=1:1),phosphine/Rh =13(molar ratio),reaction time =6 h and temperature =130℃,the conversion of Colefins and the yield of aldehyde are 99%and 94%,respectively.The catalyst retained in aqueous phase can be easily separated from the product-containing organic phase by simple phase separation and the catalytic activity remains almost constant after four consecutive cycles. 展开更多
关键词 Thermoregulated phosphine ligand mixed C11-12 olefins HYDROFORMYLATION RHODIUM
下载PDF
CONVERGENCE RATES IN THE STRONG LAWS OF NONSTATIONARYρ~*-MIXING RANDOM FIELDS 被引量:8
17
作者 张立新 《Acta Mathematica Scientia》 SCIE CSCD 2000年第3期303-312,共10页
By using a Rosenthal type inequality established in this paper, the complete convergence and almost sure summability on the convergence rates with respect to the strong law of large numbers are discussed for *-mixing... By using a Rosenthal type inequality established in this paper, the complete convergence and almost sure summability on the convergence rates with respect to the strong law of large numbers are discussed for *-mixing random fields. 展开更多
关键词 Rosenthal type inequality strong law of large numbers *-mixing random fields
下载PDF
生物炭复合载体对稻秸-猪粪混合厌氧发酵产甲烷的影响
18
作者 花瑞林 陈芳清 +2 位作者 黄永文 刘杨赟 黎泽玉 《可再生能源》 CAS CSCD 北大核心 2024年第2期151-158,共8页
文章利用生物炭负载不同浓度的碳酸氢钠、腐植酸、吐温20等催化调节剂构建了生物炭复合载体,并将各复合载体加入到稻秸-猪粪混合厌氧发酵系统中进行厌氧发酵。通过测定各处理的产气量、产甲烷量和秸秆木质纤维素的降解率,揭示了生物炭... 文章利用生物炭负载不同浓度的碳酸氢钠、腐植酸、吐温20等催化调节剂构建了生物炭复合载体,并将各复合载体加入到稻秸-猪粪混合厌氧发酵系统中进行厌氧发酵。通过测定各处理的产气量、产甲烷量和秸秆木质纤维素的降解率,揭示了生物炭复合载体对混合厌氧发酵产甲烷和秸秆降解的作用。研究结果表明:生物炭复合载体能提高甲烷产气峰值并缩短甲烷产气峰值出现的时间;生物炭复合载体可以显著提高厌氧发酵系统的累积产气量和累积甲烷产量,其中以生物炭负载吐温20的效果最好,其次为生物炭负载腐植酸和生物炭负载碳酸氢钠;与对照组相比,生物炭负载吐温20处理的产气量和甲烷产量分别提高了23.18%和62.20%;在各处理中,秸秆的降解程度以生物炭负载吐温20处理最高,其次为生物炭负载腐植酸、生物炭负载碳酸氢钠和对照组;吐温20、腐植酸和碳酸氢钠的最适负载浓度分别为2.25,0.75,2.10 g/L。 展开更多
关键词 田间混合厌氧发酵 催化调节剂 生物炭 复合载体 甲烷
下载PDF
土-石混合填土强夯动应力的简化与修正算法
19
作者 冉逸涵 肖世国 +1 位作者 廖家前 王础 《岩土力学》 EI CAS CSCD 北大核心 2024年第4期1121-1128,共8页
强夯法是一种加固某些土体的施工操作较为简单的方法,合理分析其夯击作用在土体中产生的动应力是工程实践中的关键环节之一。针对成都平原地区的典型土-石混合填土,通过现场夯击试验,测得了在4000 kN·m的夯击能作用下土体中不同深... 强夯法是一种加固某些土体的施工操作较为简单的方法,合理分析其夯击作用在土体中产生的动应力是工程实践中的关键环节之一。针对成都平原地区的典型土-石混合填土,通过现场夯击试验,测得了在4000 kN·m的夯击能作用下土体中不同深度处的竖向夯击动应力,鉴于既有算法与试验值的差异,从两个方面确定了适于土-石混合填土夯击动应力的简单计算方法。一方面针对较为复杂的既有理论公式问题,采用敏感性分析与回归分析法,建立了以夯锤质量、夯锤落距、夯锤半径、土体密度、土体动力剪切模量、土体泊松比、土体阻尼比、夯锤入土的速度损失率等8个参数表征夯击点冲击应力的线性回归方程;另一方面采用竖向动应力传递指数对理想弹性静力学理论公式进行修正,得到了基于拟静力法的土体中夯击动应力计算表达式,进而可分析确定强夯有效加固深度。试验结果显示,土-石混合填土的竖向动应力传递指数约为1.67357,土-石混合填土地层的强夯有效加固深度约为8.0m。 展开更多
关键词 强夯 现场试验 -石混合填土 动应力 应力分布
下载PDF
Synergistic Effect in Mixed Capillary Gas Chromatographic Stationap Phases Containing Heptakis(2,3,6-tri-o-pentyl)-β-cyclodextrin and Dibenzo-18-crown-6 被引量:1
20
作者 Li Ming YUAN Ruo Nong FU +3 位作者 Xue Xian CHEN Shi Hong GUl Rong Ji DAI (Chemistry Department of Yunnan Normal University.Kunming 650092)(Department of Chemical Engineering.Beijing institute of Technology,BEijing 100081)(Solar Energy Research Institute ofyunna 《Chinese Chemical Letters》 SCIE CAS CSCD 1999年第3期223-226,共4页
used-silical capillary columns containing heptakis(2、3、6-tri-o-pentyl)-β-cyclodextrinand dibenzo-18-crown-6 were prepared.By studying the selectivity of mixed stationary phases forsome solute pairs.as well a... used-silical capillary columns containing heptakis(2、3、6-tri-o-pentyl)-β-cyclodextrinand dibenzo-18-crown-6 were prepared.By studying the selectivity of mixed stationary phases forsome solute pairs.as well as comparing with the heptakis(2.3、6-tri-O-pentyl)-β-cyclodextrin and thedibenzo-18-crown-6 used as individual stationary phase、the synergistic effects were observed.These effects were affected by the column temperature.mixed ratio and linear velocity of carrier gas. 展开更多
关键词 Gas chromatography mixed stationary phase synergistic effect heptakis(2.3.6-tri-o-pentyl)-β-cyclodextrin DIBENZO-18-CROWN-6
下载PDF
上一页 1 2 59 下一页 到第
使用帮助 返回顶部