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Enhanced circular dichroism of plasmonic system in the strong coupling regime

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Chinese Physics B 2021年第4期30卷 492-496页

The circular dichroism(CD) signal of a molecule is usually weak,however,a strong CD signal in optical spectrum is desirable because of its wide range of applications in biosensing,chiral photo detection,and chiral *** this work,we show that a strong chiral response can be obtained in a hybridized system consisting of an artificial chiral molecule and a nanorod in the strong coupling *** artificial chiral molecule is composed of six quantum dots in a helix assembly,and its CD signal arises from internal Coulomb interactions between quantum *** CD signal of the hybridized system is highly dependent on the Coulomb interactions and the strong coupling progress through the electromagnetic *** use the coupled oscillator model to analyze strong coupling phenomenon and address that the strong coupling progress can amplify the CD *** work provides a scenario for designing new plasmonic nanostructures with a strong chiral optical response.

关键词： plasmonic chirality strong coupling circular dichroism

Augmented Virtual Stiffness Rendering of a Cable-driven SEA for Human-Robot Interaction

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IEEE/CAA Journal of Automatica Sinica 2017年第4期4卷 714-723页

作者： Ningbo yu Wulin zou Wen Tan Zhuo Yang IEEE Institute of Robotics and Automatic Information Systems Nankai University Tianjin Key Laboratory of Intelligent Robotics Nankai University Haihe Education Park

Human-robot interaction(HRI) is fundamental for human-centered robotics, and has been attracting intensive research for more than a decade. The series elastic actuator(SEA) provides inherent compliance, safety and further benefits for HRI, but the introduced elastic element also brings control difficulties. In this paper, we address the stiffness rendering problem for a cable-driven SEA system, to achieve either low stiffness for good transparency or high stiffness bigger than the physical spring constant, and to assess the rendering accuracy with quantified metrics. By taking a velocity-sourced model of the motor, a cascaded velocity-torque-impedance control structure is established. To achieve high fidelity torque control, the 2-DOF(degree of freedom) stabilizing control method together with a compensator has been used to handle the competing requirements on tracking performance, noise and disturbance rejection,and energy optimization in the cable-driven SEA system. The conventional passivity requirement for HRI usually leads to a conservative design of the impedance controller, and the rendered stiffness cannot go higher than the physical spring constant. By adding a phase-lead compensator into the impedance controller,the stiffness rendering capability was augmented with guaranteed relaxed passivity. Extensive simulations and experiments have been performed, and the virtual stiffness has been rendered in the extended range of 0.1 to 2.0 times of the physical spring constant with guaranteed relaxed passivity for physical humanrobot interaction below 5 Hz. Quantified metrics also verified good rendering accuracy.

关键词： Cable actuation impedance control physical human-robot interaction relaxed passivity series elastic actuator stabilizing 2-DOF(degree of freedom) controllers

End-stage liver disease score and future liver remnant volume predict post-hepatectomy liver failure in hepatocellular carcinoma

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World Journal of Clinical Cases 2019年第22期7卷 3734-3741页

作者： Fan-Hua Kong Xiong-Ying Miao heng zou Li Xiong yu Wen Bo Chen Xi Liu Jiang-Jiao Zhou Department of General Surgery The Second Xiangya Hospital Central South University

BACKGROUND Hepatocellular carcinoma(HCC)is the world’s sixth most common malignant tumor and the third cause of cancer *** great progress has been made in hepatectomy,it is still associated with a certain degree of risk of posthepatectomy liver failure(PHLF),which extends the length of hospital stay and remains the leading cause of postoperative *** have shown that assessment of hepatic functional reserve before hepatectomy is beneficial for reducing the incidence of *** To assess the value of model for end-stage liver disease(MELD)score combined with standardized future liver remnant(sFLR)volume in predicting PHLF in patients undergoing hepatectomy for *** This study was attended by 238 patients with HCC who underwent hepatectomy between January 2015 and January *** of sFLR volume,MELD score,and sFLR/MELD ratio to predict PHLF was evaluated according to the area under the receiver operating characteristic *** The patients were divided into two groups according to whether PHLF occurred after *** incidence of PHLF was 8.4%in our *** incidence of PHLF increased with the decrease in sFLR volume and the increase in MELD *** sFLR volume and MELD score were considered independent predictive factors for ***,the cut-off value of the sFLR/MELD score to predict PHLF was 0.078(P<0.001).This suggests that an sFLR/MELD≥0.078 indicates a higher incidence of PHLF than an sFLR/MELD<*** MELD combined with sFLR is a reliable and effective PHLF predictor,which is superior to MELD score or sFLR volume alone.

关键词： Post-hepatectomy liver failure Hepatocellular carcinoma Hepatectomy Model for end-stage liver disease Standardized future liver remnant Hepatitis B virus

Methane activation by[LnO]^(+):the 4f orbital matters

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Science China Chemistry 2024年第1期67卷 330-335页

作者： Bowei yuan Jingxiang zou Mincheng yu Shaodong Zhou College of Chemical and Biological Engineering Zhejiang Provincial Key Laboratory of Advanced Chemical Engineering Manufacture TechnologyZhejiang UniversityHangzhou 310027China Zhejiang Provincial Innovation Center of Advanced Chemicals Technology Institute of Zhejiang University–QuzhouQuzhou 324000China Laboratory for Sciences and Technologies of Energy Materials of Fujian Province(IKKEM) Xiamen 361005China

Gas-phase reactions of[LnO]^(+)with methane have been studied by using inductively coupled plasma-mass spectrometer(ICP-MS)combined with quantum chemical *** indicate that the[LnO]^(+)(Ln=Sm-Lu)ions are able to activate methane to generate methyl *** particular,[EuO]^(+)and[YbO]^(+)exhibit the highest ***,ab initio computations reveal a novel HAT process operating in the absence of a terminal oxygen radical,as mediated by[EuO]^(+)and[YbO]^(+).Such a process diverges from previous findings on the methane activation by metal oxide clusters,not only on the electronic pattern during the course of hydrogen transfer,but also on the important role that 4f electrons *** associated electronic origins have been discussed,and the well-designed 4f electron occupation may turn to be a promising approach in constructing lanthanide involved catalysts.

关键词： lanthanide oxides methane activation 4f orbitals quantum chemical calculation ion-molecule reaction

SUPERCAVITY MOTION WITH INERTIAL FORCE IN THE VERTICAL PLANE

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Journal of Hydrodynamics 2012年第5期24卷 752-759页

作者： yu Kai-ping zou Wang ARNDT Roger ZHANG Guang School of Astronautics Harbin Institute of TechnologyHarbin 150001China Saint Anthony Falls Laboratory University of MinnesotaMinneapolisUSA

The curvilinear motion in a vertical plane is one of the most important features of the supercavitating vehicle. It is of great significance to study the controllability and the maneuverability of the supercavitating vehicle. Models are built for the effects of the angle of attack, the gravity and the inertial force in the curvilinear motion in the vertical p｜ane. Numerica~ simulations are carried out for the supercavity motion based on these models combined with the Logvinovich model. It is shown that the maximum deviation displacement in the outward normal direction of the trajectory with a constant curvature, which occurs in the tail of the supercavity, increases as the cavitation number or the curvature radius of the supercavity trajectory decreases under the condition that other model and flow parameters are kept constant. For a varied curvature, the supercavity shape changes evidently because of the change of the ambient pressure, but with the same trend as in constant curvature. The deviation displacement increases along the supercavity length gradually.

关键词： supercavity inertial force curvilinear motion curvature radius

Determination of tetraethyl ammonium by ion-pair chromatography with indirect ultraviolet detection using 4-aminophenol hydrochloride as background ultraviolet absorbing reagent

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Chinese Chemical Letters 2014年第2期25卷 201-204页

作者： Chun-Miao zou Hong yu Miao-yu Wang College of Chemistry and Chemical Engineering Harbin Normal University and Key Laboratory of Photonic and Electronic Bandgap MaterialsMinistry of Education

A method was developed for the determination of tetraethyl ammonium （TEA） by reversed-phase ion- pair chromatography with indirect ultraviolet detection, Chromatographic separation was achieved on a reversed-phase C18 column using background ultraviolet absorbing reagent - ion-pair reagent - organic solvent as mobile phase. The effects of the background ultraviolet absorbing reagents, detection wavelength, ion-pair reagents, organic solvents and column temperature on the determination method were investigated and the retention rules discussed. Results found that TEA could be successfully analyzed by using 0.7 mmol/L 4-aminophenol hydrochloride and 0.15 mmol/L 1-heptanesulfonic acid sodium mixed with 20% （v/v） methanol as mobile phase at a UV detection wavelength of 230 nm. Under these conditions, the retention time of tetraethyl ammonium was 2.85 min. The detection limit （S/N = 3） for TEA was 0.06 mg/L. The relative standard deviations （n = 5） for peak area and retention time were 0.35% and 0.02%, respectively. The method has been successfully applied to the determination of synthesized tetraethyl ammonium bromide. Recovery of tetraethyl ammonium after spiking was 99.1%.

关键词： Ion-pair chromatography Indirect ultraviolet detection Tetraethyl ammonium 4-Aminophenol hydrochloride

Serum LDH level may predict outcome of chronic lymphocytic leukemia patients with a 17p deletion： a retrospective analysis of prognostic factors in China

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Chinese Journal of Cancer Research 2017年第2期29卷 156-165页

作者： heng Li Wenjie Xiong Huimin Liu Shuhua Yi Zhen yu Wei Liu Rui Lyu Tingyu Wang Dehui zou Zengjun Li Lugui Qiu State Key Laboratory of Experimental Hematology Institute of Hematology and Blood Disease Hospital Chinese Academy of Medical Sciences and Peking Union Medical College Tianjin 300020 China

Objective： This study aims to evaluate the natural history of patients with chronic lymphocytic leukemia （CLL） and a 17p deletion （17p-） and identify the predictive factors within this subgroup. Methods： The sample of patients with CLL were analyzed by fluorescence in situ hybridization for deletions in chromosome bands 1 lq22, 13q14 and 17p13; trisomy of bands 12q13; and translocation involving band 14q32. The data from 456 patients with or without a 17p- were retrospectively collected and analyzed. Results： The overall response rate （ORR） in patients with a 17p- was 56.9%, and patients with a high percentage of 17p- （defined as more than 25% of cells harbouring a 17p-） had a lower ORR. The median overall survival （OS） in patients with a 17p- was 78.0 months, which was significantly shorter than the OS in patients without this genetic abnormality （median 162.0 months, P〈0.001）. Within the subgroup with a 17p-, the progression-free survival was significantly shorter in patients at Binet stage B-C and patients with elevated lactate dehydrogenase （LDH）, B symptoms, unmutated IGHVand a high percentage of 17p-. Conclusions： These results indicated that patients with a 17p- CLL have a variable prognosis that might be predicted using simple clinical and laboratory characteristics.

关键词： 17p deletion chronic lymphocytic leukemia (CLL) fluorescent in situ hybridization (FISH) del 17pin CLL

Cold Spray Additive Manufacturing:Microstructure Evolution and Bonding Features

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Accounts of Materials Research 2021年第11期2卷 1071-1081页

作者： yu zou Department of Materials Science and Engineering University of TorontoTorontoON M5S 3E4Canada

CONSPECTUS:Most metal additive manufacturing(AM)methods involve the melting or sintering of feedstock powder or wire using an energy source(laser,electron beam,or electric arc).Solid-state AM,sometimes also known as non-beam-based AM,is a process in which the deposited material does not melt and is built up layer-by-layer,typically through severe plastic *** considered to be a coating technique,by virtue of its high deposition rate,cold spray additive manufacturing(CSAM)is attractive as a solid-state AM *** the CSAM process,metal powder particles are impacted onto a substrate at a supersonic velocity and relatively low *** CSAM process reduces or eliminates many problems associated with melting or beambased AM methods,making the CSAM technically attractive for a wide range of applications,such as in the aerospace,automobile,marine,biomedical,machinery,and energy sectors.

关键词： Microstructure coating attractive

Effect of screw casing structure on descending of burdens in COREX shaft furnace

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Journal of Iron and Steel Research International 2017年第1期24卷 18-26页

作者： Zi-long Qiu Zhi-guo Luo heng Zhou Ren Chen Feng Wang Zong-shu zou College of Metallurgy Northeastern University College of Metallurgy Engineering Liaoning Institute of Science and Technology

COREX shaft furnace（SF）is a typical screw feeder with a storage container coupled with eight screw casings and *** structure of screw casing plays an important role in the moving behavior of burdens,stress distribution,abrasive wear of screws,and energy consumption during the operation of ***,a three-dimensional semi-cylindrical model of actual size of COREX-3000 SF was established based on discrete element method to investigate the influences of screw casing *** results show that the increase in the gap between the outside of screw flight and screw casing is beneficial for the smooth operation of SF,resulting in uniform descending velocity along the radius of SF in the lower part,decreasing the size of recirculation region,and alleviating stress concentration in the screw ***,raising the gap appropriately is also beneficial to weaken screw abrasive wear,decrease energy consumption,and then prolong the service life of the ***,enlarging the gap also leads to more undesired high temperature reduction gas into the SF from melter gasifier,thereby deteriorating the operation of ***,an ideal distance exists between the outside of the screw flight and the screw casing,which is suggested to be equal to the average of particle diameter.

关键词： COREX shaft furnace Screw casing structure Discrete element method Recirculation structure Screw abrasive wear