资源类型

期刊论文 120

年份

2023 5

2022 7

2021 8

2020 8

2019 3

2018 8

2017 4

2016 5

2015 4

2014 6

2013 5

2012 3

2011 4

2010 8

2009 9

2008 11

2007 15

2006 2

2005 1

2002 2

展开 ︾

关键词

摩擦系数 2

BFT 1

DX桩 1

一般秩相关系数；多变量分析；预测指标；斯皮尔曼等级相关系数 1

三参数区间数 1

临床试验 1

主动磁悬浮轴承；迭代学习控制；干扰观测器 1

产业政策 1

产业集聚 1

位移与滑动形式 1

侧应力系数K0 1

修正的理论模型 1

修正系数 1

免疫抑制 1

免疫细胞 1

免疫耐受 1

分辨系数 1

列车脱轨 1

初始应力状态 1

展开 ︾

检索范围：

排序： 展示方式：

On the fouling mechanism of polysulfone ultrafiltration membrane in the treatment of coal gasification wastewater

Xue Zou,Jin Li

《化学科学与工程前沿（英文）》 2016年 第10卷 第4期   页码 490-498 doi: 10.1007/s11705-016-1600-4

摘要： Membrane fouling has been investigated by using a polysulfone ultrafiltration membrane with the molecular weight cutoff of 20 kDa to treat crushed coal pressurized gasification wastewater. Under the conditions of different feed pressures, the permeate flux declines and rejection coefficients of pollutants referring to three parameters (total organic carbon (TOC), chroma and turbidity) were studied. The membrane fouling mechanism was simulated with three classical membrane fouling models. The membrane image and pollutants were analyzed by scanning electron microscopy and gas chromatography-mass spectrography (GC-MS). The results indicate that the permeate flux decreases with volume reduction factor before reaching a constant value. The rejection coefficients were also measured: = 70.5%, = 84.9% and = 91%. Further analysis shows that the higher the feed pressure is, the sooner the permeate flux reaches constant value and the more sharply the permeate flux declines. Constant flux indicates a nonlinear growth with feed pressure ( ): when equals 1.2 bar, the mark for the critical flux, slight membrane fouling occurs; when exceeds 1.2 bar, cake layer pollution aggravates. Also the rejection coefficients of global pollutant increases slightly with , suggesting the possibility of cake compression when exceeds 1.2 bar. Through regression analysis, the fouling of polysulfone ultrafiltration membrane could be fitted very well by cake filtration model. The membrane pollutants were identified as phthalate esters and long-chain alkenes by GC-MS, and a certain amount of inorganic pollutants by X-ray photoelectron spectroscopy.

关键词： membrane fouling     ultrafiltration membrane     coal gasification wastewater     rejection coefficient    

HTML PDF 收藏

RGO-MXene membranes with wettability-regulated channels: improved water permeability and electro-enhanced rejection

《环境科学与工程前沿（英文）》 2023年 第17卷 第1期 doi: 10.1007/s11783-023-1601-8

摘要：

● Electroconductive RGO-MXene membranes were fabricated.

关键词： Reduced graphene oxide     MXene     Membrane     Water permeance     Dye rejection     Electro-assistance    

HTML PDF 收藏

Simulation of the optimal heat rejection pressure for transcritical CO

Junlan YANG, Yitai MA, Minxia LI, Hua TIAN

《能源前沿（英文）》 2010年 第4卷 第4期   页码 522-526 doi: 10.1007/s11708-010-0027-8

摘要： In order to optimize and control transcritical CO refrigeration cycle, a mathematical model was developed to simulate the system performance. The simulation results show that a maximum COP exists at the optimal heat rejection pressure not only for throttle valve cycle but also for expander cycle. Also, the optimal heat rejection pressures of the throttle valve cycle are greater than those of the expander cycle under the same condition. In order to further obtain correlation of the optimal heat rejection pressure for transcritical CO expander cycle, it is necessary to analyze the impact degree of compressor efficiency, expander efficiency, gas cooler outlet temperature and evaporation temperature. Based on the simulation results, the values of the optimal heat rejection pressure for the expander cycle were regressed in terms of gas cooler outlet temperature and evaporation temperature at given compressor efficiency and expander efficiency. Finally, two types of polynomial correlations were obtained. One is cubic form, with an average deviation of less than 0.5% and the other is simplified form, with an average deviation of less than 1%. It is, therefore, convenient to use either correlation to simulate the performance of transcritical CO expander cycle.

关键词： transcritical CO2 cycle     optimal heat rejection pressure     simulation     expander    

HTML PDF 收藏

Novel Ag-AgBr decorated composite membrane for dye rejection and photodegradation under visible light

Yixing Wang, Liheng Dai, Kai Qu, Lu Qin, Linzhou Zhuang, Hu Yang, Zhi Xu

《化学科学与工程前沿（英文）》 2021年 第15卷 第4期   页码 892-901 doi: 10.1007/s11705-020-2011-0

摘要： Photocatalytic membranes have received increasing attention due to their excellent separation and photodegradation of organic contaminants in wastewater. Herein, we bound Ag-AgBr nanoparticles onto a synthesized polyacrylonitrile-ethanolamine (PAN-ETA) membrane with the aid of a chitosan (CS)-TiO layer via vacuum filtration and partial reduction. The introduction of the CS-TiO layer improved surface hydrophilicity and provided attachment sites for the Ag-AgBr nanoparticles. The PAN-ETA/CS-TiO /Ag-AgBr photocatalytic membranes showed a relatively high water permeation flux (~ 47 L·m ·h ·bar ) and dyes rejection (methyl orange: 88.22%; congo red: 95%; methyl blue: 97.41%; rose bengal: 99.98%). Additionally, the composite membranes exhibited potential long-term stability for dye/salt separation (dye rejection: ~97%; salt rejection: ~6.5%). Moreover, the methylene blue and rhodamine B solutions (20 mL, 10 mg·L ) were degraded approximately 90.75% and 96.81% in batch mode via the synthesized photocatalytic membranes under visible light irradiation for 30 min. This study provides a feasible method for the combination of polymeric membranes and inorganic catalytic materials.

关键词： Ag-AgBr     dye rejection     photodegradation     visible light    

HTML PDF 收藏

基于特征模型的全系数自适应磁悬浮储能飞轮控制算法鲁棒性研究 None

Xujun LYU, Long DI, Zongli LIN

《信息与电子工程前沿（英文）》 2019年 第20卷 第1期   页码 120-130 doi: 10.1631/FITEE.1800606

摘要： 基于特征模型的全系数自适应控制算法最近在一个磁悬浮轴承支承的高速储能飞轮实验平台实现。该控制算法是一个智能控制算法，它的设计不依赖于对象的数学模型，但能在控制过程中在线辨识特征模型。大量数值仿真和实验结果表明，此智能控制算法控制效果比原有μ综合控制算法更好，该μ综合控制算法最初在高速实验台上根据其抑制振动能力设计。大量仿真进一步证实此智能控制算法在考虑模型不确定性、外界扰动以及时滞情况下具有相当强鲁棒性。

关键词： 智能控制；鲁棒性；不确定性；抗干扰；主动磁悬浮轴承；储能飞轮    

HTML PDF 收藏

Gut microbiota and its implications in small bowel transplantation

null

《医学前沿（英文）》 2018年 第12卷 第3期   页码 239-248 doi: 10.1007/s11684-018-0617-0

摘要：

The gut microbiota is mainly composed of a diverse population of commensal bacterial species and plays a pivotal role in the maintenance of intestinal homeostasis, immune modulation and metabolism. The influence of the gut microbiota on solid organ transplantation has recently been recognized. In fact, several studies indicated that acute and chronic allograft rejection in small bowel transplantation (SBT) is closely associated with the alterations in microbial patterns in the gut. In this review, we focused on the recent findings regarding alterations in the microbiota following SBT and the potential roles of these alterations in the development of acute and chronic allograft rejection. We also reviewed important advances with respect to the interplays between the microbiota and host immune systems in SBT. Furthermore, we explored the potential of the gut microbiota as a microbial marker and/or therapeutic target for the predication and intervention of allograft rejection and chronic dysfunction. Given that current research on the gut microbiota has become increasingly sophisticated and comprehensive, large cohort studies employing metagenomic analysis and multivariate linkage should be designed for the characterization of host–microbe interaction and causality between microbiota alterations and clinical outcomes in SBT. The findings are expected to provide valuable insights into the role of gut microbiota in the development of allograft rejection and other transplant-related complications and introduce novel therapeutic targets and treatment approaches in clinical practice.

关键词： gut microbiota     small bowel transplantation     acute rejection     chronic rejection     mucosal immunity     biomarker     microbiota-targeted therapy    

HTML PDF 收藏

Role of membrane and compound properties in affecting the rejection of pharmaceuticals by different RO

Yang-ying Zhao, Fan-xin Kong, Zhi Wang, Hong-wei Yang, Xiao-mao Wang, Yuefeng F. Xie, T. David Waite

《环境科学与工程前沿（英文）》 2017年 第11卷 第6期 doi: 10.1007/s11783-017-0975-x

摘要： This study was conducted to assess the merits and limitations of various high-pressure membranes, tight nanofiltration (NF) membranes in particular, for the removal of trace organic compounds (TrOCs). The performance of a low-pressure reverse osmosis (LPRO) membrane (ESPA1), a tight NF membrane (NF90) and two loose NF membranes (HL and NF270) was compared for the rejection of 23 different pharmaceuticals (PhACs). Efforts were also devoted to understand the effect of adsorption on the rejection performance of each membrane. Difference in hydrogen bond formation potential (HFP) was taken into consideration. Results showed that NF90 performed similarly to ESPA1 with mean rejection higher than 95%. NF270 outperformed HL in terms of both water permeability and PhAC rejection higher than 90%. Electrostatic effects were more significant in PhAC rejection by loose NF membranes than tight NF and LPRO membranes. The adverse effect of adsorption on rejection by HL and ESPA1 was more substantial than NF270 and NF90, which could not be simply explained by the difference in membrane surface hydrophobicity, selective layer thickness or pore size. The HL membrane had a lower rejection of PhACs of higher hydrophobicity (log D>0) and higher HFP (>0.02). Nevertheless, the effects of PhAC hydrophobicity and HFP on rejection by ESPA1 could not be discerned. Poor rejection of certain PhACs could generally be explained by aspects of steric hindrance, electrostatic interactions and adsorption. High-pressure membranes like NF90 and NF270 have a high promise in TrOC removal from contaminated water.

关键词： Trace organic compounds (TrOCs)     Nanofiltration (NF)     Adsorption     Membrane properties     Water treatment    

HTML PDF 收藏

RETRACTED ARTICLE: Momentum exchange coefficient for two jet flows mixing in a tee junction

《化学科学与工程前沿（英文）》 2023年 第17卷 第12期   页码 2161-2161 doi: 10.1007/s11705-009-0143-3

摘要： RETRACTED ARTICLE: Momentum exchange coefficient for two jet flows mixing in a tee junction

关键词： tee junction     Momentum exchange coefficient     RETRACTED    

HTML PDF 收藏

巨噬细胞在器官移植急性排斥反应中的双重作用 Review

谭亮, 郭易难, 冯畅, 侯仰潇, 谢续标, 赵勇

《工程（英文）》 2022年 第10卷 第3期   页码 21-29 doi: 10.1016/j.eng.2021.10.015

摘要：

天然免疫细胞在移植免疫反应中发挥着重要作用。巨噬细胞是重要的天然免疫细胞；在发生排斥反应的同种异基因移植器官中，巨噬细胞也是浸润的众多免疫细胞之一。巨噬细胞的浸润与器官移植的短期和长期效果呈负相关。在功能方面，巨噬细胞具有异质性和可塑性。在器官移植排斥反应中，巨噬细胞可以为适应性免疫提呈同种异基因抗原以及提供共刺激信号和细胞因子，也可以直接损伤移植器官。此外，一些具有免疫调节功能的巨噬细胞亚群，可以通过抑制排斥反应和促进免疫耐受来保护移植器官。尽管目前研究人员已认识到巨噬细胞在移植器官损伤过程中的潜在作用，但他们对巨噬细胞在移植排斥反应中的不同作用关注不够。为此，本文就巨噬细胞在急性移植免疫反应中的独特作用以及免疫抑制剂对巨噬细胞的影响进行了综述和讨论。通过分析发现，对于巨噬细胞在移植免疫中的作用的相关研究中，应更多地关注其复杂性和关键功能，并应更多地致力于开发针对巨噬细胞的免疫抑制药物，并使之有利于提高移植器官的长期存活率和移植免疫耐受的建立。

关键词： 巨噬细胞     移植     耐受     排斥反应     调节性巨噬细胞    

HTML PDF 收藏

DK型纳滤膜对水中微量邻苯二甲酸酯的吸附及截留特性

金叶,吴礼光,张林

《中国工程科学》 2014年 第16卷 第7期   页码 36-41

摘要：

邻苯二甲酸酯（PAEs）是一类典型的环境激素，对人体健康具有较大的危害。本文采用DK型纳滤膜去除水中微量邻苯二甲酸酯，分析了水中微量邻苯二甲酸二甲酯(DMP)、邻苯二甲酸二乙酯(DEP)、邻苯二甲酸正二丁酯(DNBP)和邻苯二甲酸异二丁酯(DIBP)等在DK型纳滤膜表面的吸附行为，考察了4 种邻苯二甲酸酯的辛醇/水分配系数(logKow)和相对分子质量(Mw)对其在DK型纳滤膜表面的吸附和膜的截留特性的影响。结果表明Freundlich 吸附方程能较好地描述4 种邻苯二甲酸酯在DK型纳滤膜表面的动态吸附行为；DK型纳滤膜对水中微量邻苯二甲酸酯的截留特性表现为膜面吸附作用和膜孔筛分效应，吸附平衡后的截留机理取决于膜孔的筛分效应，DK型纳滤膜对DMP、DEP、DNBP、DIBP的截留率分别为55 %、78 %、96 %和96.8 % (0.5 MPa，30 ℃，DMP、DEP、DNBP、DIBP浓度均为300 μg/L)，表明DK型纳滤膜能高效去除水中的DNBP和DIBP。

关键词： 邻苯二甲酸酯     纳滤     吸附     截留    

HTML PDF 收藏

Experimental study of heat transfer coefficient with rectangular baffle fin of solar air heater

Foued CHABANE,Nesrine HATRAF,Noureddine MOUMMI

《能源前沿（英文）》 2014年 第8卷 第2期   页码 160-172 doi: 10.1007/s11708-014-0321-y

摘要： This paper presents an experimental analysis of a single pass solar air collector with, and without using baffle fin. The heat transfer coefficient between the absorber plate and air can be considerably increased by using artificial roughness on the bottom plate and under the absorber plate of a solar air heater duct. An experimental study has been conducted to investigate the effect of roughness and operating parameters on heat transfer. The investigation has covered the range of Reynolds number from 1259 to 2517 depending on types of the configuration of the solar collectors. Based on the experimental data, values of Nusselt number have been determined for different values of configurations and operating parameters. To determine the enhancement in heat transfer and increment in thermal efficiency, the values of Nusselt have been compared with those of smooth duct under similar flow conditions.

关键词： Nusselt number     flow rate     heat transfer     heat transfer coefficient     thermal efficiency     forced convection    

HTML PDF 收藏

A photolysis coefficient for characterizing the response of aqueous constituents to photolysis

David R. HOKANSON,Ke LI,R. Rhodes TRUSSELL

《环境科学与工程前沿（英文）》 2016年 第10卷 第3期   页码 428-437 doi: 10.1007/s11783-015-0780-3

摘要： UV photolysis and UV based advanced oxidation processes (AOPs) are gaining more and more attention for drinking water treatment. Quantum yield ( ) and molar absorption coefficient ( ) are the two critical parameters measuring the effectiveness of photolysis of a compound. The product of the two was proposed as a fundamental measure of a constituent’s amenability to transformation by photolysis. It was shown that this product, named the photolysis coefficient, , can be determined using standard bench tests and captures the properties that govern a constituent’s transformation when exposed to light. The development showed the photolysis coefficient to be equally useful for microbiological, inorganic and organic constituents. Values of calculated by the authors based on quantum yield and molar absorption coefficient data from the literature were summarized. Photolysis coefficients among microorganisms ranged from 8500 to more than 600000 and are far higher than for inorganic and organic compounds, which varied over a range of approximately 10 to 1000 and are much less sensitive to UV photolysis than the microorganisms.

关键词： UV photolysis     disinfection     advanced oxidation     N-nitrosodimethylamine     quantum yield     absorption coefficient    

HTML PDF 收藏

Effect of heat transfer coefficient of steam turbine rotor on thermal stress field under off-design condition

Jie GUO,Danmei XIE,Hengliang ZHANG,Wei JIANG,Yan ZHOU

《能源前沿（英文）》 2016年 第10卷 第1期   页码 57-64 doi: 10.1007/s11708-015-0385-3

摘要： The precise calculation of temperature and thermal stress field of steam turbine rotor under off-design conditions is of paramount significance for safe and economic operation, in which an accurate calculation of heat transfer (HT) coefficient plays a decisive role. HT coefficient changes dramatically along with working conditions. First, a finite element analysis of rotor model, applied with ordinary rotor materials, has been conducted to investigate the temperature and thermal stress difference along with the change of HT coefficient from 20 W/(m ·°C) to 20000 W/(m ·°C). Next, the differentiation between existing empirical formulas has been analyzed from the aspect of physical significance of non-dimension parameters. Finally, a verifying case of the cold startup of a 1000MW unit has been proceeded. The result shows that the accuracy of coefficient calculation when steam parameters are low has a greater influence on that of rotor temperature and thermal stress, which means a precise empirical HT coefficient formula, like the Sarkar formula is strongly recommended. When steam parameters are high and HT coefficient is larger than 10 W/(m ·°C), there will be barely any influence on the calculation of thermal stress. This research plays a constructive role in the calculation and analysis of thermal stress.

关键词： steam turbine     rotor     thermal stress     heat transfer coefficient     empirical formula    

HTML PDF 收藏

Gut microbial balance and liver transplantation: alteration, management, and prediction

null

《医学前沿（英文）》 2018年 第12卷 第2期   页码 123-129 doi: 10.1007/s11684-017-0563-2

摘要：

Liver transplantation is a conventional treatment for terminal stage liver diseases. However, several complications still hinder the survival rate. Intestinal barrier destruction is widely observed among patients receiving liver transplant and suffering from ischemia–reperfusion or rejection injuries because of the relationship between the intestine and the liver, both in anatomy and function. Importantly, the resulting alteration of gut microbiota aggravates graft dysfunctions during the process. This article reviews the research progress for gut microbial alterations and liver transplantation. Especially, this work also evaluates research on the management of gut microbial alteration and the prediction of possible injuries utilizing microbial alteration during liver transplantation. In addition, we propose possible directions for research on gut microbial alteration during liver transplantation and offer a hypothesis on the utilization of microbial alteration in liver transplantation. The aim is not only to predict perioperative injuries but also to function as a method of treatment or even inhibit the rejection of liver transplantation.

关键词： gut microbial balance     liver transplantation     ischemia–reperfusion     acute rejection    

HTML PDF 收藏

Dimensionality reduction and prediction of soil consolidation coefficient using random forest coupling

Hai-Bang LY; Huong-Lan Thi VU; Lanh Si HO; Binh Thai PHAM

《结构与土木工程前沿（英文）》 2022年 第16卷 第2期   页码 224-238 doi: 10.1007/s11709-022-0812-6

摘要： The consolidation coefficient of soil (Cv) is a crucial parameter used for the design of structures leaned on soft soi. In general, the Cv is determined experimentally in the laboratory. However, the experimental tests are time-consuming as well as expensive. Therefore, researchers tried several ways to determine Cv via other simple soil parameters. In this study, we developed a hybrid model of Random Forest coupling with a Relief algorithm (RF-RL) to predict the Cv of soil. To conduct this study, a database of soil parameters collected from a case study region in Vietnam was used for modeling. The performance of the proposed models was assessed via statistical indicators, namely Coefficient of determination (R2), Root Mean Squared Error (RMSE), and Mean Absolute Error (MAE). The proposal models were constructed with four sets of soil variables, including 6, 7, 8, and 13 inputs. The results revealed that all models performed well with a high performance (R2 > 0.980). Although the RF-RL model with 13 variables has the highest prediction accuracy ( R2 = 0.9869), the difference compared with other models was negligible (i.e., R2 = 0.9824, 0.9850, 0.9825 for the cases with 6, 7, 8 inputs, respectively). Thus, it can be concluded that the hybrid model of RF-RL can be employed to predict Cv based on the basic soil parameters.

关键词： soil consolidation coefficient     machine learning     random forest     Relief    

HTML PDF 收藏

标题 作者 时间 类型 操作

On the fouling mechanism of polysulfone ultrafiltration membrane in the treatment of coal gasification wastewater

Xue Zou,Jin Li

期刊论文

RGO-MXene membranes with wettability-regulated channels: improved water permeability and electro-enhanced rejection

期刊论文

Simulation of the optimal heat rejection pressure for transcritical CO

Junlan YANG, Yitai MA, Minxia LI, Hua TIAN

期刊论文

Novel Ag-AgBr decorated composite membrane for dye rejection and photodegradation under visible light

Yixing Wang, Liheng Dai, Kai Qu, Lu Qin, Linzhou Zhuang, Hu Yang, Zhi Xu

期刊论文

基于特征模型的全系数自适应磁悬浮储能飞轮控制算法鲁棒性研究

Xujun LYU, Long DI, Zongli LIN

期刊论文

Gut microbiota and its implications in small bowel transplantation

null

期刊论文

Role of membrane and compound properties in affecting the rejection of pharmaceuticals by different RO

Yang-ying Zhao, Fan-xin Kong, Zhi Wang, Hong-wei Yang, Xiao-mao Wang, Yuefeng F. Xie, T. David Waite

期刊论文

RETRACTED ARTICLE: Momentum exchange coefficient for two jet flows mixing in a tee junction

期刊论文

巨噬细胞在器官移植急性排斥反应中的双重作用

谭亮, 郭易难, 冯畅, 侯仰潇, 谢续标, 赵勇

期刊论文

DK型纳滤膜对水中微量邻苯二甲酸酯的吸附及截留特性

金叶,吴礼光,张林

期刊论文

Experimental study of heat transfer coefficient with rectangular baffle fin of solar air heater

Foued CHABANE,Nesrine HATRAF,Noureddine MOUMMI

期刊论文

A photolysis coefficient for characterizing the response of aqueous constituents to photolysis

David R. HOKANSON,Ke LI,R. Rhodes TRUSSELL

期刊论文

Effect of heat transfer coefficient of steam turbine rotor on thermal stress field under off-design condition

Jie GUO,Danmei XIE,Hengliang ZHANG,Wei JIANG,Yan ZHOU

期刊论文

Gut microbial balance and liver transplantation: alteration, management, and prediction

null

期刊论文

Dimensionality reduction and prediction of soil consolidation coefficient using random forest coupling

Hai-Bang LY; Huong-Lan Thi VU; Lanh Si HO; Binh Thai PHAM

期刊论文