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Toxic effects of wastewater from various phases of monosodium glutamate production on seed germination and root elongation of crops

LIU Rui, ZHOU Qixing, ZHANG Lanying, GUO Hao

《环境科学与工程前沿（英文）》 2007年 第1卷 第1期   页码 114-119 doi: 10.1007/s11783-007-0021-5

摘要： To make a comprehensive assessment on monosodium glutamate (MSG) wastewater pollution, a pollution exposure experiment was carried out on the seed germination and root elongation of wheat, Chinese cabbage and tomato by using the wastewater discharged from different processing phases of MSG production. The results showed that there were significantly positive linear relationships between the inhibitory rates of wheat seed germination and root elongation and the COD of the mother liquor scraps. The toxicity of MSG wastewater to the test crops was in the order of tomato > Chinese cabbage > wheat, indicating that tomato was the most sensitive to the wastewater, and could be considered as an ideal toxic bioindicator. The half-effect concentrations (IC) based on the seed germination and root elongation of the test crops exposed to the wastewater discharged from various processing phases of MSG production was 22.0 32 432 and 17.3 3320 mg/L, respectively.

关键词： monosodium glutamate     different     inhibitory     pollution exposure     half-effect    

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Torsional vibrations of a cylindrical foundation embedded in a saturated poroelastic half-space

Dazhi WU,Lu YU

《结构与土木工程前沿（英文）》 2015年 第9卷 第2期   页码 194-202 doi: 10.1007/s11709-015-0292-z

摘要： Considering the interactions between an embedded foundation and saturated soil, the torsional vibrations of a cylindrical foundation embedded in a saturated poroelastic medium are analyzed in this paper. Both a rigid foundation and an elastic foundation are considered. Assuming both the side surface and the bottom surface of the foundation are perfectly bonded to soil, the reaction torques that the side soil and bottom soil acting on the foundation can be gained from basic dynamic equations of the poroelastic medium. According to the dynamic equilibrium equations of a foundation under harmonic torque, the torsional vibrations of an embedded cylindrical foundation are presented. Besides, the angular amplitude of the foundation, the equivalent stiffness and damping coefficients of the soil are expressed explicitly. Selected examples are presented to investigate the influence of relevant parameters on the torsional vibrations.

关键词： embedded foundation     saturated soil     rigid foundation     elastic foundation     torsional vibration    

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What should be done for the “second half” of China’s urbanization?

Chunfei WU, Xiaojiang LI, Pengfei LI

《工程管理前沿（英文）》 2018年 第5卷 第2期   页码 276-277 doi: 10.15302/J-FEM-2017106

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基于碳纳米管场效应管的新型三元半加器及乘法器 Article

Sepehr TABRIZCHI,Nooshin AZIMI,Keivan NAVI

《信息与电子工程前沿（英文）》 2017年 第18卷 第3期   页码 423-433 doi: 10.1631/FITEE.1500366

摘要： 多值逻辑（multiple-valued logic, MVL），例如三元逻辑，在近年来是大量研究项目的研究对象。MVL可以降低必要操作的数目、减小芯片面积。碳纳米管场效应管（CNTFETs）被认为是硅晶体管可行的替代方案。将CNTFETs与MVL结合，可以得到更快、更灵活的独特设计方案。本文利用微纳技术和三元逻辑设计出了新型的半加器和乘法器。微纳技术和三元逻辑的采纳降低了元件功耗和面积，提升了元件运行速度。我们利用斯坦福CNTFET模型和HSPICE软件对本文设计器件进行了仿真，并将仿真结果与相关研究结果进行了对比。

关键词： 碳纳米管场效应管设计；三元；半加器；乘法器；多值逻辑    

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Estimation of photolysis half-lives of dyes in a continuous-flow system with the aid of quantitative

Davoud BEIKNEJAD,Mohammad Javad CHAICHI

《环境科学与工程前沿（英文）》 2014年 第8卷 第5期   页码 683-692 doi: 10.1007/s11783-014-0680-y

摘要： In this paper the photolysis half-lives of the model dyes in water solutions and under ultraviolet (UV) radiation were determined by using a continuous-flow spectrophotometric method. A quantitative structure-property relationship (QSPR) study was carried out using 21 descriptors based on different chemometric tools including stepwise multiple linear regression (MLR) and partial least squares (PLS) for the prediction of the photolysis half-life ( ) of dyes. For the selection of test set compounds, a K-means clustering technique was used to classify the entire data set, so that all clusters were properly represented in both training and test sets. The QSPR results obtained with these models show that in MLR-derived model, photolysis half-lives of dyes depended strongly on energy of the highest occupied molecular orbital ( ), largest electron density of an atom in the molecule ( ) and lipophilicity (log ). While in the model derived from PLS, besides aforementioned and descriptors, the molecular surface area ( ), molecular weight ( ), electronegativity ( ), energy of the second highest occupied molecular orbital ( ) and dipole moment ( ) had dominant effects on logt values of dyes. These were applicable for all classes of studied dyes (including monoazo, disazo, oxazine, sulfonephthaleins and derivatives of fluorescein). The results were also assessed for their consistency with findings from other similar studies.

关键词： dye     photolysis half-life     quantitative structure-property relationship     continuous-flow     stepwise multiple linear regression     partial least squares    

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全/半双工混合蜂窝网络：用户准入和功率控制 None

Lu CHEN, Ding-zhu WEN, Cai-jun ZHONG, Guan-ding YU

《信息与电子工程前沿（英文）》 2018年 第19卷 第3期   页码 379-387 doi: 10.1631/FITEE.1700027

摘要： 考虑一个具有混合全/半双工基站的单小区蜂窝网络。对于有N条信道、K个上行用户和M个下行用户（max{K+M}≤N≤K+M）的实际场景，解决了用户准入和功率控制问题，在保证用户服务质量（QoS）的同时，最大化用户准入数量并最小化总发射功率。对于联合用户准入和功率分配问题，将该问题建模成一个0-1整数规划问题。由于寻找该问题最优解是一个NP-hard问题，通过引入“虚拟用户”的新概念，提出一种低复杂度算法。仿真结果表明，该算法和分支界定法性能相似，并且明显优于随机匹配算法的性能。

关键词： 全双工；半双工；用户准入；功率控制    

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descriptors into quantitative structure-property relationship models for prediction of the photolysis half-life

Yueping BAO, Qiuying HUANG, Wenlong WANG, Jiangjie XU, Fan JIANG, Chenghong FENG

《环境科学与工程前沿（英文）》 2011年 第5卷 第4期   页码 505-511 doi: 10.1007/s11783-011-0318-2

摘要： Quantitative structure-property relationship (QSPR) models were developed for prediction of photolysis half-life ( ) of polychlorinated biphenyls (PCBs) in water under ultraviolet (UV) radiation. Quantum chemical descriptors computed by the PM3 Hamiltonian software were used as independent variables. The cross-validated value for the optimal QSPR model is 0.966, indicating good prediction capability for lg values of PCBs in water. The QSPR results show that the largest negative atomic charge on a carbon atom ( ) and the standard heat of formation (Δ ) have a dominant effect on values of PCBs. Higher values or lower Δ values of the PCBs leads to higher lg values. In addition, the lg values of PCBs increase with the increase in the energy of the highest occupied molecular orbital values. Increasing the largest positive atomic charge on a chlorine atom and the most positive net atomic charge on a hydrogen atom in PCBs leads to the decrease of lg values.

关键词： photolysis     polychlorinated biphenyls (PCBs)     quantitative structure-property relationships (QSPRs)     quantum chemical descriptors    

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Promoting Si-graphite composite anodes with SWCNT additives for half and NCM811 full lithium ion batteries

Jingning SHAN, Xiaofang YANG, Chao YAN, Yiguang JU, Lin CHEN, Fang ZHAO

《能源前沿（英文）》 2019年 第13卷 第4期   页码 626-635 doi: 10.1007/s11708-019-0650-y

摘要： Single wall carbon nanotube (SWCNT) additives were formulated into µm-Si-graphite composite electrodes and tested in both half cells and full cells with high nickel cathodes. The critical role of small amount of SWCNT addition (0.2 wt%) was found for significantly improving delithiation capacity, first cycle coulombic efficiency (FCE), and capacity retention. Particularly, Si (10 wt%)-graphite electrode exhibits 560 mAh/g delithiation capacity and 92% FCE at 0.2 C during the first charge-discharge cycle, and 91% capacity retention after 50 cycles (0.5 C) in a half cell. Scanning electron microscope (SEM) was used to illustrate the electrode morphology, compositions and promoting function of the SWCNT additives. In addition, full cells assembled with high nickel-NCM811 cathodes and µm-Si-graphite composite anodes were evaluated for the consistence between half and full cell performance, and the consideration for potential commercial application. Finally, criteria to assess Si-containing anodes are proposed and discussed from an industrial perspective.

关键词： lithium-ion battery     Si anode     Si-graphite composite     single wall carbon nanotube (SWCNT)     NCM811    

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On subsurface box-shaped lined tunnel under incident SH-wave propagation

《结构与土木工程前沿（英文）》 2021年 第15卷 第4期   页码 948-960 doi: 10.1007/s11709-021-0740-x

摘要： In this paper, a half-plane time-domain boundary element method is applied to obtain the seismic ground response, including a subsurface box-shaped lined tunnel deployed in a linear homogenous elastic medium exposed to obliquely incident SH-waves. Only the boundary around the tunnel is required to be discretized. To prepare an appropriate model by quadratic elements, a double-node procedure is used to receive dual boundary fields at corners as well as change the direction of the normal vector. After encoding the method in a previously confirmed computer program, a numerical study is carried out to sensitize some effective parameters, including frequency content and incident wave angle for obtaining a surface response. The depth and impedance ratio of the lining are assumed to be unvaried. The responses are illustrated in the time and frequency domains as two/three-dimensional graphs. The results showed that subsurface openings with sharp corners distorted the propagation path of the anti-plane waves to achieve the critical states on the ground surface. The present approach can be proposed to civil engineers for preparing simple underground box-shaped models with angular boundaries.

关键词： box-lined tunnel     half-plane BEM     surface response     SH-wave     time-domain    

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Pressure drop analysis on the positive half-cell of a cerium redox flow battery using computational fluid

Fernando F. Rivera, Berenice Miranda-Alcántara, Germán Orozco, Carlos Ponce de León, Luis F. Arenas

《化学科学与工程前沿（英文）》 2021年 第15卷 第2期   页码 399-409 doi: 10.1007/s11705-020-1934-9

摘要： Description of electrolyte fluid dynamics in the electrode compartments by mathematical models can be a powerful tool in the development of redox flow batteries (RFBs) and other electrochemical reactors. In order to determine their predictive capability, turbulent Reynolds-averaged Navier-Stokes (RANS) and free flow plus porous media (Brinkman) models were applied to compute local fluid velocities taking place in a rectangular channel electrochemical flow cell used as the positive half-cell of a cerium-based RFB for laboratory studies. Two different platinized titanium electrodes were considered, a plate plus a turbulence promoter and an expanded metal mesh. Calculated pressure drop was validated against experimental data obtained with typical cerium electrolytes. It was found that the pressure drop values were better described by the RANS approach, whereas the validity of Brinkman equations was strongly dependent on porosity and permeability values of the porous media.

关键词： CFD simulation     porous media     porous electrode     pressure drop     redox flow battery    

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延长腺相关病毒递送药物的半衰期提高治疗效果 Article

吴会芳, 胡丹, 李泉晓, 王春雨, 朱晓艺, 李威, 陈宾凡, 季萍, 黄可可, 黄爱玲, 黄竞荷, Dimiter S. Dimitrov, 吴艳玲, 应天雷

《工程（英文）》 2023年 第21卷 第2期   页码 203-213 doi: 10.1016/j.eng.2022.02.009

摘要：

延长基于蛋白质治疗药物的半衰期可以提高药物疗效。然而，基因治疗本质上是提供了长期表达所需的治疗性蛋白，药物半衰期对基因治疗疗效的影响尚不清楚。在这项腺相关病毒（adeno-associated virus, AAV）基因治疗研究中，通过与免疫球蛋白G1（immunoglobulin G 1, IgG1）可溶性单体Fc 区（soluble monomeric IgG1 fragment crystallizable, sFc）或Fc 区融合，设计了几种能够延长半衰期的蛋白质。研究表明，延长AAV递送的小分子双功能蛋白和成纤维细胞生长因子21（fibroblast growth factor 21, FGF21）的半衰期显著增加了它们在血液循环中的浓度。此外，AAV递送FGF21 延长其半衰期使2 型糖尿病动物模型中肝损伤和血糖显著降低，并改善了葡萄糖耐量和胰岛素敏感性。这些结果证明了延长药物半衰期的基因治疗在应对人类疾病中的治疗潜力。

关键词： 基因治疗     腺相关病毒     半衰期     成纤维细胞生长因子21     2型糖尿病    

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Analysis of effect of different construction methods of piles on the end effect on skin friction of piles

ZHOU Hongbo, CHEN Zhuchang

《结构与土木工程前沿（英文）》 2007年 第1卷 第4期   页码 458-463 doi: 10.1007/s11709-007-0062-7

摘要： Based on the comparative analysis of end effect on skin friction of displacement-pile (driven pile), the end effect on skin friction of bored pile is studied. The end effect on skin friction between driven pile and bored pile is different and the end effect on skin friction of bored pile is reduce of skin friction in the soil layer adjacent to the pile end. The degradation degree of skin friction is deduced with the increase of the distance from pile end. The concept of additional mud cake formed by the effect of cushion at the bottom of borehole during pouring concrete is introduced to explain the mechanism of end effect on skin friction of the bored pile. The test results of post-grouting piles indicate that the post-grouting technique is an effective way to improve the end effect on skin friction of bored pile.

关键词： distance     different     concept     additional     bottom    

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Soil seismic analysis for 2D oblique incident waves using exact free-field responses by frequency-based finite/infinite element method

《结构与土木工程前沿（英文）》 2022年 第16卷 第12期   页码 1530-1551 doi: 10.1007/s11709-022-0900-7

摘要： The seismic analysis of a viscoelastic half-space under two-dimensional (2D) oblique incident waves is carried out by the finite/infinite element method (FIEM). First, the frequency-domain exact solutions for the displacements and stresses of the free field are derived in general form for arbitrary incident P and SV waves. With the present formulation, no distinction needs to be made for SV waves with over-critical incident angles that make the reflected P waves disappear, while no critical angle exists for P waves. Next, the equivalent seismic forces of the earthquake (Taft Earthquake 1952) imposed on the near-field boundary are generated by combining the solutions for unit ground accelerations with the earthquake spectrum. Based on the asymmetric finite/infinite element model, the frequency-domain motion equations for seismic analysis are presented with the key parameters selected. The results obtained in frequency and time domain are verified against those of Wolf’s, Luco and de Barros’ and for inversely computed ground motions. The parametric study indicated that distinct phase difference exists between the horizontal and vertical responses for SV waves with over-critical incident angles, but not for under-critical incident angles. Other observations were also made for the numerical results inside the text.

关键词： oblique incident waves     critical angle     half-space     finite/infinite element approach     seismic response analysis    

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A review on different theoretical models of electrocaloric effect for refrigeration

《能源前沿（英文）》 2023年 第17卷 第4期   页码 478-503 doi: 10.1007/s11708-023-0884-6

摘要： The performance parameters for characterizing the electrocaloric effect are isothermal entropy change and the adiabatic temperature change, respectively. This paper reviews the electrocaloric effect of ferroelectric materials based on different theoretical models. First, it provides four different calculation scales (the first-principle-based effective Hamiltonian, the Landau-Devonshire thermodynamic theory, phase-field simulation, and finite element analysis) to explain the basic theory of calculating the electrocaloric effect. Then, it comprehensively reviews the recent progress of these methods in regulating the electrocaloric effect and the generation mechanism of the electrocaloric effect. Finally, it summarizes and anticipates the exploration of more novel electrocaloric materials based on the framework constructed by the different computational methods.

关键词： electrocaloric effect     effective Hamiltonian     phase-field modeling     different theoretical models    

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标题 作者 时间 类型 操作

Toxic effects of wastewater from various phases of monosodium glutamate production on seed germination and root elongation of crops

LIU Rui, ZHOU Qixing, ZHANG Lanying, GUO Hao

期刊论文

Torsional vibrations of a cylindrical foundation embedded in a saturated poroelastic half-space

Dazhi WU,Lu YU

期刊论文

What should be done for the “second half” of China’s urbanization?

Chunfei WU, Xiaojiang LI, Pengfei LI

期刊论文

基于碳纳米管场效应管的新型三元半加器及乘法器

Sepehr TABRIZCHI,Nooshin AZIMI,Keivan NAVI

期刊论文

Estimation of photolysis half-lives of dyes in a continuous-flow system with the aid of quantitative

Davoud BEIKNEJAD,Mohammad Javad CHAICHI

期刊论文

全/半双工混合蜂窝网络：用户准入和功率控制

Lu CHEN, Ding-zhu WEN, Cai-jun ZHONG, Guan-ding YU

期刊论文

descriptors into quantitative structure-property relationship models for prediction of the photolysis half-life

Yueping BAO, Qiuying HUANG, Wenlong WANG, Jiangjie XU, Fan JIANG, Chenghong FENG

期刊论文

Promoting Si-graphite composite anodes with SWCNT additives for half and NCM811 full lithium ion batteries

Jingning SHAN, Xiaofang YANG, Chao YAN, Yiguang JU, Lin CHEN, Fang ZHAO

期刊论文

On subsurface box-shaped lined tunnel under incident SH-wave propagation

期刊论文

Pressure drop analysis on the positive half-cell of a cerium redox flow battery using computational fluid

Fernando F. Rivera, Berenice Miranda-Alcántara, Germán Orozco, Carlos Ponce de León, Luis F. Arenas

期刊论文

延长腺相关病毒递送药物的半衰期提高治疗效果

吴会芳, 胡丹, 李泉晓, 王春雨, 朱晓艺, 李威, 陈宾凡, 季萍, 黄可可, 黄爱玲, 黄竞荷, Dimiter S. Dimitrov, 吴艳玲, 应天雷

期刊论文

李浩然：基于同伴效应与网络效应的“气代煤〞改造决策研究（2020年7月11日）

2022年05月19日

会议视频

Analysis of effect of different construction methods of piles on the end effect on skin friction of piles

ZHOU Hongbo, CHEN Zhuchang

期刊论文

Soil seismic analysis for 2D oblique incident waves using exact free-field responses by frequency-based finite/infinite element method

期刊论文

A review on different theoretical models of electrocaloric effect for refrigeration

期刊论文