检索结果-南通市图书馆

CHINESE JOURNAL OF CHEMICAL ENGINEERING 2024年第11期75卷 62-73页

作者： Tao, Ran gu, Siwen Liu, Linlin Du, jian Dalian Univ Technol Sch Chem Engn Inst Proc Syst Engn Dalian 116023 Peoples R China Changzhou Inst Technol Sch Photoelect Engn Changzhou 213032 Peoples R China

The traditional methods for synthesizing flexible heat exchanger networks (HENs) are not directly applicable to inter-plant HEN challenges, primarily due to the spread of system uncertainty across plants via intermedium fluid circles. This complicates the synthesis process significantly. To tackle this issue, this study proposes a decomposed stepwise methodology to facilitate the flexible synthesis of the interplant HENs performing indirect heat integration. A decomposition strategy is proposed to divide the overall network into manageable sub-networks by dissecting the intermedium fluid circles. To address the variability in intermedium fluid temperatures, a temperature fluctuation analysis approach is developed and a heuristic rule is introduced to maintain the temperature feasibility of the intermedium fluids. To ensure adequate flexibility and cost-effectiveness of the designed networks, flexibility analysis and network retrofit steps are conducted through model-based optimization techniques. The efficacy of the method is demonstrated through two case studies, showing its potential in achieving the desired operational flexibility for inter-plant HENs. (c) 2024 The Chemical Industry and Engineering Society of China, and Chemical Industry Press Co., Ltd. All rights are reserved, including those for text and data mining, AI training, and similar technologies.

关键词： Inter-plant heat exchanger networks (HENs) Indirect heat integration Flexible synthesis Flexible analysis Decomposition method

Superconducting Single-Layer T-Graphene and Novel Synthesis Routes

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Physics Letters 2019年第9期36卷 46-63页

作者： Qinyan gu Dingyu Xing jian Sun National Laboratory of Solid State Microstructures School of Physics and Collaborative Innovation Center of Ad vanced MicrostructuresNanjing UniversityNanjing 210093

Single-layer superconductors are ideal materials for fabricating superconducting nano ***,up to date,very few single-layer elemental superconductors have been predicted and especially no one has been successfully synthesized ***,using crystal structure search techniques and ab initio calculations,we predict that a single-layer planar carbon sheet with 4-and 8-membered rings called T-graphene is a new intrinsic elemental superconductor with superconducting critical temperature(Tc)up to around 20.8 *** importantly,we propose a synthesis route to obtain such a single-layer T-graphene,that is,a T-graphene potassium intercalation compound(C4 K with P4/mmm symmetry)is firstly synthesized at high pressure(>11.5 GPa)and then quenched to ambient condition;and finally,the single-layer T-graphene can be either exfoliated using the electrochemical method from the bulk C4 K,or peeled off from bulk T-graphite C4,where C4 can be obtained from C4 K by evaporating the K ***,we find that the calculated Tc of C4 K is about 30.4 K at 0 GPa,which sets a new record for layered carbon-based *** present findings add a new class of carbon-based *** particular,once the single-layer T-graphene is synthesized,it can pave the way for fabricating superconducting devices together with other 2 D materials using the layer-by-layer growth techniques.

关键词： red Superconducting Single-Layer T-Graphene and Novel Synthesis Routes Graphene

PREDICTION OF VORTEX-INDUCED VIBRATION OF LONG FLEXIBLE CYLINDERS MODELED BY A COUPLED NONLINEAR OSCILLATOR:INTEGRAL TRANSFORM SOLUTION

在线全文

学校读者我要写书评

暂无评论

Journal of Hydrodynamics 2012年第6期24卷 888-898页

作者： gu Ji-jun AN Chen LEVI Carlos SU jian Ocean Engineering Program COPPEUniversidade Federal do Rio de Janeiro Nuclear Engineering Program COPPEUniversidade Federal do Rio de Janeiro

The Generalized Integral Transform Technique （GITT） was applied to predict dynamic response of Vortex-Induced Vibration （VIV） of a long flexible cylinder. A nonlinear wake oscillator model was used to represent the cross-flow force acting on the cylinder, leading to a coupled system of second-order Partial Differential Equations （PDEs） in temporal variable. The GITT approach was used to transform the system of PDEs to a system of Ordinary Differential Equations （ODEs）, which was numerically solved by using the Adams-Moulton and Gear method （DIVPAG） developed by the International Mathematics and Statistics Library （IMSL）. Numerical results were presented for comparison to those given by the finite difference method and experimental results, allowing a critical evaluation of the technique performance. The influence of variation of mean axial tension induced by elongation of flexible cylinder was evaluated, which was shown to be not negligible in numerical simulation of VIV of a long flexible cylinder.

关键词： Vortex-Induced Vibration (VIV) nonlinear wake oscillator flexible cylinder integral transform

MGB probe assay for rapid detection of mtDNA11778 mutation in the Chinese LHON patients by real-time PCR

在线全文

学校读者我要写书评

暂无评论

Journal of Zhejiang University-Science B(Biomedicine & Biotechnology) 2008年第8期9卷 610-615页

作者： jian-yong WANG Yang-shun gu Jing WANG Yi TONG Ying WANG Jun-bing SHAO Ming QI Department of Ophthalmology the First Affiliated Hospital School of Medicine Zhejiang University Hangzhou 310003 China Department of Ophthalmology the First Affiliated Hospital Fujian Medical University Fuzhou 325000 China Department of Ophthalmology Eye Hospital Academy of Chinese Medical Science Beijing 100040 China Institute of Biotechnology Shanghai Zhijiang Biotech Incorporation Shanghai 210038 China Institute of Genome Sciences University of Rochester Medical Center Rochester NY 14642 USA

Objective： Leber＇s hereditary optic neuropathy （LHON） is a maternally inherited degeneration of the optic nerve caused by point mutations of mitochondrial DNA （mtDNA）. Many unsolved questions regarding the penetrance and pathophysiological mechanism of LHON demand efficient and reliable mutation testing. This study aims to develop a minor groove binder （MGB） probe assay for rapid detection of mtDNA11778 mutation and heteroplasmy in Chinese LHON patients by real-time polymerase chain reaction （PCR）. Methods： Forty-eight patients suspected of having LHON and their maternal relatives underwent a molecular genetic evaluation, with 20 normal individuals as a control group at the same time. A real-time PCR involving two MGB probes was used to detect the mtDNA 1 1778 mutation and heteroplasmy. A linear standard curve was obtained by pUCmLHONG and pUCmLHONA clones. Results： All 48 LHON patients and their maternal relatives were positive for rntDNA11778 mutation in our assay, 27 heteroplasmic and 21 homoplasmic. Eighteen cases did not show an occurrence of the disease, while 9 developed the disease among the 27 heteroplasmic mutation cases. Eleven did not show an occurrence of the disease, while 10 cases developed the disease among 21 homoplasmic mutation cases. There was a significant difference in the incidence between the heteroplasmic and the homoplasmic mutation types. The time needed for running a real-time PCR assay was only 80 min. Conclusion： This real-time PCR assay is a rapid, reliable method for mtDNA mutation detection as well as heteroplasmy quantification. Detecting this ratio is very important for predicting phenotypic expression of unaffected carriers.

关键词： Leber's hereditary optic neuropathy (L HON) Mitochondrial DNA (mtDNA) MtDNA 11778 mutation Minor groove binder (MGB) orobe. Real-time oolvmerase chain reaction (PCR)

Fault detection for sector-bounded non-linear systems with servo inputs and sensor stuck faults

在线全文

学校读者我要写书评

暂无评论

Journal of Control and Decision 2019年第3期6卷 147-165页

作者： Ying gu Xiao-jian Li School of Science Dalian Jiaotong UniversityDalianChina College of Information Science and Engineering Northeastern UniversityShenyangChina State Key Laboratory of Synthetical Automation of Process Industries Northeastern UniversityShenyangChina

This paper addresses the fault detection(FD)problem for discretetime sector-bounded non-linear systems with finite-frequency servo *** non-linear systems are firstly modelled as *** main contributions are that a novel FD filter which combines the finite-frequency H∞and H−indices is *** from the existing methods,the proposed FD scheme guarantees that the generated residuals are robust against the servo inputs in fault-free case and sensitive to them in faulty ***,the small sensor stuck faults including outagefaults can be *** this class of systems,the existing finite-frequency FD filter design methods are invalid.A new lemma is developed to characterise the system performances in finite-frequency *** addition,sufficient conditions for the existence of such a FD filter are derived by introducing slack variable and linear matrix inequalities ***,an example is presented to demonstrate the method and its effectiveness.

关键词： Fault detection servo inputs sensor stuck faults sector-bounded nonlinearity finite-frequency domain

Experimental study of wind loads on gable roofs of low-rise buildings with overhangs

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Frontiers of Structural and Civil Engineering 2018年第3期12卷 300-317页

作者： Peng HUANG Ling TAO Ming gu yong QUAN i University Shanghai 200092China

Gable roofs with overhangs （eaves） are the common constructions of low-rise buildings on the southeastern coast of China, and they were vulnerable to typhoons from experience. The wind pressure distributions on gable roofs of low-rise buildings are investigated by a series of wind tunnel tests which consist of 99 test cases with various roof pitches, height-depth ratios and width-depth ratios. The block pressure coefficients and worst negative （block） pressure coefficients on different roof regions of low-rise buildings are proposed for the main structure and building envelope, respectively. The effects of roof pitch, height-depth ratio, and width-depth ratio on the pressure coefficients of each region are analyzed in detail. In addition, the pressure coefficients on the roofs for the main structure and building envelope are fitted according to roof pitch, height-depth ratio and width-depth ratio of the low-rise building. Meanwhile, the rationality of the fitting formulas is verified by comparing the fitting results with the codes of different countries. Lastly, the block pressure coefficients and worst negative pressure coefficients are recommended to guide the design of low-rise buildings in typhoon area and act as references for the future＇s modification of wind load codes.

关键词： low-rise building gable roof wind loads wind tunnel test block pressure coefficient load code

Finite element response sensitivity analysis of three-dimensional soil-foundation-structure interaction (SFSI) systems

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Earthquake Engineering and Engineering Vibration 2018年第3期17卷 555-566页

作者： gu Quan Liu yongdou Li yong Lin Chun School of Architecture and Civil Engineering Xiamen University Department of Civil and Environmental Engineering University of Alberta

The nonlinear finite element（FE） analysis has been widely used in the design and analysis of structural or geotechnical *** response sensitivities（or gradients） to the model parameters are of significant importance in these realistic engineering *** the sensitivity calculation has lagged behind,leaving a gap between advanced FE response analysis and other research hotspots using the response *** response sensitivity analysis is crucial for any gradient-based algorithms,such as reliability analysis,system identification and structural *** various sensitivity analysis methods,the direct differential method（DDM） has advantages of computing efficiency and accuracy,providing an ideal tool for the response gradient *** paper extended the DDM framework to realistic complicated soil-foundation-structure interaction（SFSI） models by developing the response gradients for various constraints,element and materials *** enhanced framework is applied to three-dimensional SFSI system prototypes for a pilesupported bridge pier and a pile-supported reinforced concrete building frame structure,subjected to earthquake loading *** DDM results are verified by forward finite difference method（FFD）.The relative importance（RI） of the various material parameters on the responses of SFSI system are investigated based on the DDM response sensitivity *** FFD converges asymptotically toward the DDM results,demonstrating the advantages of DDM（e.g.,accurate,efficient,insensitive to numerical noise）.Furthermore,the RI and effects of the model parameters of structure,foundation and soil materials on the responses of SFSI systems are investigated by taking advantage of the sensitivity analysis *** extension of DDM to SFSI systems greatly broaden the application areas of the d gradient-based algorithms,*** model updating and nonlinear system identification of complicated SFSI systems.

关键词： finite element method response sensitivity analysis direct differentiation method finite difference method soil-foundation-structure interaction

Polychlorinated dibenzo-p-dioxins and dibenzofurans in flue gas emissions from municipal solid waste incinerators in China

在线全文

学校读者我要写书评

暂无评论

Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2008年第9期9卷 1296-1303页

作者： Tong CHEN Yue-ling gu jian-hua YAN Xiao-dong LI Sheng-yong LU Hui-fen DAI Ke-fa CEN State Key Laboratory of Clean Energy Utilization Zhejiang University Hangzhou 310027 China School of Medicine Zhejiang University Hangzhou 310058 China

Polychlorinated dibenzo-p-dioxins and furans （PCDD/Fs） emissions in flue gas from two types of municipal solid waste incinerators （MSWIs） most commonly used in China were investigated in this study. The selected incinerators include two grate-type MSWIs： MSWI-A （350 t/d） and MSWI-B 050 t/d）, and two fluidized bed MSWIs： MSWI-C （400 t/d） and MSWI-D （400 t/d）, which are all equipped with semi-dry lime scrubber and bag filter except MSWI-D equipped with cyclone and wet scrubber （WS） as air pollutant control device （APCD）. Results indicated that the emission concentration and the international toxic equivalents （I-TEQs） of the PCDD/Fs from the stacks were in the range of 1.210-10.273 ng/Nm^3 and 0.019-0.201 ng I-TEQ/Nm^3, respectively. They were greatly lower than the emission regulation standard of PCDD/Fs in China （1.0 ng I-TEQ/Nm^3）. However, only the PCDD/Fs emission level from MSWI-C was below 0.1 ng I-TEQ/Nm^3. Although the homologue profiles were distinct, the contributions of the 2,3,7,8-subsituted congeners to the total I-TEQ were similar among all the investigated MSWIs. Two major 2,3,7,8-substituted congeners, 2,3,4,7,8-PeCDF and 1,2,3,7,8-PeCDD, account for 47% and 9% （average values） of the total I-TEQ values, respectively. The correlation between PCDD/Fs levels and composition of flue gas was also discussed.

关键词： Polychlorinated dibenzo-p-dioxins and dibenzofurans (PCDD/Fs) Municipal solid waste incinerator (MSWI) Grate Fluidized bed

Time synchronization and ranging under unknown positions and velocities

在线全文

学校读者我要写书评

暂无评论

Science China(Technological Sciences) 2017年第2期60卷 271-281页

作者： gu XiaoBo CHANG Qing XU yong WANG Dun School of Electronic & Information Engineering Beihang University Space Star Technology Co. Ltd

The process to achieve time synchronization and ranging for a network of mobile nodes is raising a concern among researchers, and hence a variety of joint time synchronization and ranging algorithms have been proposed in recent years. However, few of them handle the case of all-node motion under unknown positions and velocities. This study addresses the problem of determining ranging and time synchronization for a group of nodes moving within a local area. First, we examined several models of clock discrepancy and synchronous two-way ranging. Based upon these models, we present a solution for time synchronization with known positions and velocities. Next, we propose a functional model that jointly estimates the clock skew, clock offset, and time of flight in the absence of a priori knowledge for a pair of mobile nodes. Then, we extend this model to a network-wide time synchronization scheme by way of a global least square estimator. We also discuss the advantages and disadvantages of our model compared to the existing algorithms, and we provide some applicable scenarios as well. Finally, we show that the simulation results verify the validity of our analysis.

关键词： time synchronization two-way ranging relative motion clock model joint estimation

Applying a global pulse disturbance to eliminate spiral waves in models of cardiac muscle

在线全文

学校读者我要写书评

暂无评论

Chinese Physics B 2021年第7期30卷 157-162页

作者： jian Gao Changgui gu Huijie Yang Business School University of Shanghai for Science and TechnologyShanghai 200093China

Removal of spiral waves in cardiac muscle is necessary because of their threat to *** methods for this removal are to apply a local disturbance to the media,such as a periodic ***,most of these methods accelerate the beating of the cardiac muscle,resulting in the aggravation of the ventricular tachycardia,which directly threatens *** the present study,in order to clear off spiral waves,a global pulse-disturbance is applied to the media based on three models of cardiac *** is found that the spiral waves are eliminated and the frequency of the cardiac muscle is decreased in a short time,and finally,the state of the medium reaches the normal oscillation,which supports a target *** method sheds light on the removal of spiral waves in cardiac muscle and can prevent the ventricular tachycardia as well as the ventricular fibrillation.

关键词： ventricular fibrillation spiral wave pattern formation elimination