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LES of geometric eccentricity effects on flow field and aerodynamic forces of T-shaped towers 认领 引用
1
作者 ZHAO Shuang ZHANG Xianhong +1 位作者 ZHANG Chengtao YAN Zhitao 《Journal of Southeast University(English Edition)》 EI CAS 2026年第2期206-215,共10页
To investigate the aerodynamic performance of geometrically eccentric structures,wind tunnel testing and numerical simulations were employed to examine the flow field characteristics and tri-component aerodynamic forc... To investigate the aerodynamic performance of geometrically eccentric structures,wind tunnel testing and numerical simulations were employed to examine the flow field characteristics and tri-component aerodynamic forces of T-shaped towers with varying geometric eccentricities.A mathematical model for their generalized force spectra was established.The reliability of the numerical simulation method was validated by comparing the lift,drag,and torque coefficients obtained from wind tunnel experiments with the numerical results.Subsequently,the influence of geometric eccentricity on wind pressure distribution,vortex shedding characteristics,and turbulent kinetic energy distribution was analyzed.Using random vibration theory,a normalized formula for the full-tower force spectrum of the T-shaped tower was derived through nonlinear fitting of numerical simulation data.The results indicate that with increasing eccentricity,the vortex shedding of the structure becomes more complex,with a bias toward the eccentric side.Its wake morphology undergoes distortion and deformation,exhibiting vertical extensibility and leading to peak wind pressure occurring at the longer cross-arm.Furthermore,the torque coefficient demonstrated the highest sensitivity to eccentricity variations.A 50% increase in eccentricity resulted in a 99.7% increase in the torque coefficient. 展开更多
关键词 geometric eccentricity T-shaped towers aerodynamic forces flow field characteristics
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Frequency-Selective Transmission Control of Ultrasonic Guided Waves in T-Shaped Pipes Using Acoustic Metamaterials:Computer Modeling and Experimental Validation 认领 引用
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作者 Weiguo Chen Xiaobin Hong +2 位作者 Kai Chen Yunyun Deng Bin Zhang 《Computer Modeling in Engineering & Sciences》 SCIE EI 2026年第6期371-401,共31页
Structural health monitoring(SHM)of ship piping systems is a core component of predictive maintenance strategies for complex marine engineering systems.During the detection of ship T-shaped pipes using ultrasonic guid... Structural health monitoring(SHM)of ship piping systems is a core component of predictive maintenance strategies for complex marine engineering systems.During the detection of ship T-shaped pipes using ultrasonic guided waves,signal overlap arises from the diffusion of guided wave branches.To address this issue,an intelligent waveguidance mechanism based on acoustic metamaterials is proposed for dynamic propagation control of ultrasonic guided waves.First,a metamaterial unit composed of a stainless steel substrate and a copper column is designed.The control of bandgap characteristics by lattice constant,column diameter,and column height is systematically investigated,and a design range of structural parameters with optimal bandgap is obtained.The particle swarm optimization algorithm is used to design and optimize two metamaterials,Acoustic-metamaterials-1(AMs-1)and Acoustic-metamaterials-2(AMs-2),which further improve the bandgap performance and achieve a transmission loss of over 30 dB for guided waves at 100 and 150 kHz,respectively.Simulation and experimental verification show that when AMs-1 and AMs-2 are deployed in the left and right branches of the T-shaped pipe,respectively,wave propagation can be achieved according to the excitation frequency.At 1oo kHz excitation,the guided wave preferentially propagates along the right branch,while at 150 kHz excitation,it preferentially propagates along the left branch.This method actively regulates the guided wave propagation trajectory at the structural level,thereby preventing signal overlap at the T-shaped pipe and offering a novel technical solution for the efficient damage detection and predictive maintenance in ship pipe systems. 展开更多
关键词 Acoustic metamaterials bandgap regulation ultrasonic guided waves frequency-selective transmission T-shaped pipe particle swarm optimization
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Hot-Spot Stress Analyses of a T-Shaped Tubular Joint Based on Scanned Weld Geometry 认领 引用
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作者 CHEN Jingjing DONG Yan +3 位作者 AI Zhihao KANG Zhuang PAIK Jeom Kee QU Wei 《Journal of Ocean University of China》 SCIE CAS CSCD 2026年第3期813-822,共10页
Jacket-type offshore structures consist of tubular members joined by welding,where the weld geometry plays a crucial role in determining hot-spot stresses and,consequently,the fatigue strength of the joints.The weld g... Jacket-type offshore structures consist of tubular members joined by welding,where the weld geometry plays a crucial role in determining hot-spot stresses and,consequently,the fatigue strength of the joints.The weld geometry can be modeled using the finite element(FE)method;however,FE models usually employ assumed weld geometry.It is of interest to investigate the effect of the modeling options related to the weld geometry on the hot-spot stress.The weld geometry of a T-shaped tubular joint was measured using 3D scanning.Different from conventional industry practices,this approach captures the actual shape of the weld joints and toes.An FE model was generated based on the coordinates of the weld toe points,which can lead to more accurate hot-spot stress predictions.In addition,one FE model without welds and two FE models with assumed weld geometry,based on the specifications of the American Welding Society(AWS),were constructed.The hot-spot stresses of these models were compared,and significant deviations were observed.These findings highlight that model uncertainty in hot-spot stress should be considered in fatigue strength assessment to enhance the reliability of offshore structural designs. 展开更多
关键词 T-shaped tubular joint 3D scanning weld geometry hot-spot stress stress concentration factor
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Second-Law Analysis of Double Diffusive Convection of Casson Ternary Nanofluid in a Porous Enclosure with a T-Shaped Baffle 认领 引用
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作者 Sarna Soren Samrat Hansda +3 位作者 Umair Khan Anuar Ishak Ahmed Kadhim Hussein Md Mamun Molla 《Computer Modeling in Engineering & Sciences》 SCIE EI 2026年第5期793-827,共35页
This study presents a numerical investigation of thermosolutal convection within a baffled porous cavity filled with a radiative Casson-based ternary aqueous nanofluid.The ternary hybrid nanofluid is formulated by dis... This study presents a numerical investigation of thermosolutal convection within a baffled porous cavity filled with a radiative Casson-based ternary aqueous nanofluid.The ternary hybrid nanofluid is formulated by dispersing three distinct nanoparticles into a water-based solution,aiming to enhance the thermal and solute transport characteristics.The cavity includes internal baffles that modulate convective flow and facilitate improved energy transport.The governing equations for momentum,energy,species concentration,and entropy generation are discretized and solved using a higher-order compact(HOC)finite difference scheme,ensuring superior numerical precision.The novelty of the present study lies in the irreversibility analysis of thermosolutal convection of a Casson ternary nanofluid in a porous wavy enclosure with a T-shaped baffle,highlighting the combined effects of nonNewtonian behavior,ternary nanoparticle interaction,and geometric modification on entropy generation and transport performance.The impacts of key physical parameters on solutal and thermal distributions,entropy generation,and the Bejan number are systematically examined.The study reveals that the combined influence of the non-Newtonian nature of the Casson fluid and thermal radiation significantly alters flow structure and transport rates.Enhanced heat transfer is observed with increasing radiation parameters,while solutal transport remains relatively less sensitive.The presence of internal baffles promotes localized vortices and thermal layering,contributing to complex thermo-solutal interactions.The outcomes also show that the inclusion of a T-shaped baffle within the container enhances overall convective transport characteristics and system performance.The findings provide valuable insights into the design of advanced energy systems involving non-Newtonian nanofluids in porous enclosures under radiative and geometric constraints. 展开更多
关键词 Thermosolutal convection T-shaped baffle Casson fluid ternary hybrid nanofluid entropy generation thermal radiation wavy enclosure
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Improved design of special boundary elements for T-shaped reinforced concrete walls 认领 引用 被引量：10
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作者 Ji Xiaodong Liu Dan Qian Jiaru 《Earthquake Engineering and Engineering Vibration》 SCIE EI CSCD 2017年第1期83-95,共13页
This study examines the design provisions of the Chinese GB 50011-2010 code for seismic design of buildings for the special boundary elements of T-shaped reinforced concrete walls and proposes an improved design metho... This study examines the design provisions of the Chinese GB 50011-2010 code for seismic design of buildings for the special boundary elements of T-shaped reinforced concrete walls and proposes an improved design method. Comparison of the design provisions of the GB 50011-2010 code and those of the American code ACI 318-14 indicates a possible deficiency in the T-shaped wall design provisions in GB 50011-2010. A case study of a typical T-shaped wall designed in accordance with GB 50011-2010 also indicates the insufficient extent of the boundary element at the non-flange end and overly conservative design of the flange end boundary element. Improved designs for special boundary elements ofT-shaped walls are developed using a displacement-based method. The proposed design formulas produce a longer boundary element at the non-flange end and a shorter boundary element at the flange end, relative to those of the GB 50011-2010 provisions. Extensive numerical analysis indicates that T-shaped walls designed using the proposed formulas develop inelastic drift of 0.01 for both cases of the flange in compression and in tension. 展开更多
关键词 code comparison displacement-based method seismic design special boundary element T-shaped wall
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Influences of fillet radius and draft angle on local loading process of titanium alloy T-shaped components 认领 引用 被引量：9
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作者 张大伟 杨合 +1 位作者 孙志超 樊晓光 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2011年第12期2693-2704,共12页
In order to study influences of geometric parameters on the T-shaped components local loading process, a new mathematical model considering the fillet radius and draft angle was established by using the slab method. T... In order to study influences of geometric parameters on the T-shaped components local loading process, a new mathematical model considering the fillet radius and draft angle was established by using the slab method. The results obtained by the mathematical model agree with the data form experiment and numerical simulation, and the results are closer to the experimental and simulation results. The influence of draft angle may be neglected under the forming conditions used. The influence of fillet radius is notable, especially in the case that the ratio of fillet radius to rib width is less than 0.75. 展开更多
关键词 fillet radius draft angle T-shaped component local loading slab method
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Effects of punch size, magnetic field, and magnetorheological elastomers medium on forming T-shaped thin-walled Inconel 718 tubes 认领 引用 被引量：4
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作者 Qiucheng YANG Cheng CHENG +7 位作者 Ali Abd EL-ATY Chunmei LIU Shenghan HU Yao QIN Tao LI Cong WU Yong XU Xunzhong GUO 《Chinese Journal of Aeronautics》 SCIE EI CAS CSCD 2022年第1期226-237,共12页
This study aims at investigating the impact of using the Magnetorheological Elastomers(MREs)medium to improve the formability of T-shaped Inconel 718 tubes during the bulging process.Besides,the influence of the punch... This study aims at investigating the impact of using the Magnetorheological Elastomers(MREs)medium to improve the formability of T-shaped Inconel 718 tubes during the bulging process.Besides,the influence of the punch size and the intensity of the magnetic field on the branch height and wall thickness distribution of the T-shaped Inconel 718 tubes are also explored.The results showed that the parts formed by the punch with a length of 5 mm in the pressurization zone have better forming quality.The external magnetic field can promote a high branch,and by increasing the intensity of the magnetic field,the branch height was increased and then decreased.At the same time,the magnetic field reduced the amount of material accumulation between the guiding zone and the bulging zone.Besides,it promotes the material in the guiding zone to enter the bulging zone and improve the bulging ability of the T-shaped tube. 展开更多
关键词 Magnetic field strength Magnetorheological Elastomers(MREs) Pressurization zone T-shaped tube Wall thickness distribution
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Dynamic behavior of outburst two-phase flow in a coal mine T-shaped roadway:The formation of impact airflow and its disaster-causing effect 认领 引用 被引量：4
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作者 Liang Cheng Jiang Xu +4 位作者 Shoujian Peng Hailin Yang Feng Jiao Bin Zhou Fazhi Yan 《International Journal of Mining Science and Technology》 SCIE EI CAS CSCD 2023年第8期1001-1017,共17页
The study of the dynamic disaster mechanism of coal and gas outburst two-phase flow is crucial for improving disaster reduction and rescue ability of coal mine outburst accidents.An outburst test in a T-shaped roadway... The study of the dynamic disaster mechanism of coal and gas outburst two-phase flow is crucial for improving disaster reduction and rescue ability of coal mine outburst accidents.An outburst test in a T-shaped roadway was conducted using a self-developed large-scale outburst dynamic disaster test system.We investigated the release characteristics of main energy sources in coal seam,and obtained the dynamic characteristics of outburst two-phase flow in a roadway.Additionally,we established a formation model for outburst impact flow and a model for its flow in a bifurcated structure.The results indicate that the outburst process exhibits pulse characteristics,and the rapid destruction process of coal seam and the blocking state of gas flow are the main causes of the pulse phenomenon.The outburst energy is released in stages,and the elastic potential energy is released in the vertical direction before the horizontal direction.In a straight roadway,the impact force oscillates along the roadway.With an increase in the solid–gas ratio,the two-phase flow impact force gradually increases,and the disaster range extends from the middle of the roadway to the coal seam.In the area near the coal seam,the disaster caused by the two-phase flow impact is characterized by intermittent recovery.In a bifurcated roadway,the effect of impact airflow on impact dynamic disaster is much higher than that of two-phase flow,and the impact force tends to weaken with increasing solid-gas ratio.The impact force is asymmetrically distributed;it is higher on the left of the bifurcated roadway.With an increase in the solid-gas ratio,the static pressure rapidly decreases,and the bifurcated structure accelerates the attenuation of static pressure.Moreover,secondary acceleration is observed when the shock wave moves along the T-shaped roadway,indicating that the bifurcated structure increases the shock wave velocity. 展开更多
关键词 Multiphase flow Coal and gas outburst Dynamic disaster Impact airflow T-shaped bifurcated roadway Coal seam
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Analytical Modeling of Fluid Sloshing in A 2D Rectangular Container with A Bottom-Mounted T-Shaped Baffle 认领 引用 被引量：3
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作者 MENG Xun MA Xiao-zhong +2 位作者 ZHANG You-ming FANG Hai ZHOU Ding 《China Ocean Engineering》 SCIE EI CSCD 2022年第2期299-310,共12页
An analytical procedure is presented to evaluate the fluid sloshing characteristics in a two-dimensional(2D)rectangular container with a bottom-mounted T-shaped baffle.The fluid region is divided into several sub-doma... An analytical procedure is presented to evaluate the fluid sloshing characteristics in a two-dimensional(2D)rectangular container with a bottom-mounted T-shaped baffle.The fluid region is divided into several sub-domains with hypothetical interfaces and the velocities and pressures of the fluid on adjacent interfaces should be identical.The separation of variables in conjunction with the superposition principle is employed to formulate the velocity potential of each sub-domain.The Fourier series expansion is used to derive the eigenvalue equation by substituting the velocity potential solutions into the free surface conditions and the continuity conditions on adjacent interfaces.Under the horizontal base excitation,the total velocity potential of fluid is decomposed of the impulsive and perturbed velocity potentials.The orthogonality of the sloshing modes is demonstrated by implementing Gauss formula.The dynamic response equation is established by incorporating the total velocity potential solution into the surface wave equation.Excellent agreements are achieved between the present results and those from the reported literature and finite element code.Numerical results are exhibited to reveal the effect of the baffle parameters and excitation frequency on sloshing characteristics and responses of liquid. 展开更多
关键词 rectangular container T-shaped baffle sub-domain sloshing characteristics dynamic response
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Analysis of the modulation mechanisms of the electric field and breakdown performance in AlGaN/GaN HEMT with a T-shaped field-plate 认领 引用 被引量：3
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作者 毛维 范举胜 +6 位作者 杜鸣 张金风 郑雪峰 王冲 马晓华 张进成 郝跃 《Chinese Physics B》 SCIE EI CAS CSCD 2016年第12期430-434,共5页
A novel A1GaN/GaN high electron mobility transistor （HEMT） with a source-connected T-shaped field-plate （ST-FP HEMT） is proposed for the first time in this paper. The source-connected T-shaped field-plate （ST-FP... A novel A1GaN/GaN high electron mobility transistor （HEMT） with a source-connected T-shaped field-plate （ST-FP HEMT） is proposed for the first time in this paper. The source-connected T-shaped field-plate （ST-FP） is composed of a source-connected field-plate （S-FP） and a trench metal. The physical intrinsic mechanisms of the ST-FP to improve the breakdown voltage and the FP efficiency and to modulate the distributions of channel electric field and potential are studied in detail by means of two-dimensional numerical simulations with Silvaco-ATLAS. A comparison to the HEMT and the HEMT with an S-FP （S-FP HEMT） shows that the ST-FP HEMT could achieve a broader and more uniform channel electric field distribution with the help of a trench metal, which could increase the breakdown voltage and the FP efficiency remarkably. In addition, the relationship between the structure of the ST-FP, the channel electric field, the breakdown voltage as well as the FP efficiency in ST-FP HEMT is analyzed. These results could open up a new effective method to fabricate high voltage power devices for the power electronic applications. 展开更多
关键词 AlGaN/GaN HEMT source-connected T-shaped field-plate breakdown voltage FP efficiency
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Numerical investigation of flow pattern and components of three-dimensional velocity around a submerged T-shaped spur dike in a 90° bend 认领 引用 被引量：4
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作者 Mohammad Vaghefi Yaser Safarpoor Maryam Akbari 《Journal of Central South University》 SCIE EI CAS CSCD 2016年第11期2984-2998,共15页
Spur dike is one of the river training structures. This work presented a numerical simulation of flow field and three-dimensional velocity around a T-shaped spur dike located in bend using SSIIM model. The main object... Spur dike is one of the river training structures. This work presented a numerical simulation of flow field and three-dimensional velocity around a T-shaped spur dike located in bend using SSIIM model. The main objective of this work is to investigate the three-dimensional velocities and streamlines at transverse and longitudinal sections and plan views around the T-shaped spur dike in different submergence ratios(0, 5%, 15%, 25% and 50%). It is concluded that by increasing the submergence ratio from 5% to 50%, the maximum of scour is reduced; the maximum of longitudinal velocity increases by 7.7% and occurs at the water surface in spur dike axis. Near the bed, the maximum of vertical velocity occurs at the end of spur wing. By analyzing the streamlines at transverse sections, the followings were deduced for different submergence ratios: different dimensions and different positions of vortices around the spur dike. 展开更多
关键词 T-shaped spur dike flow pattern submergence ratio SSIIM model
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Performance of a Self-Aligned InP/GaInAs SHBT with a Novel T-Shaped Emitter 认领 引用 被引量：2
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作者 苏树兵 刘训春 +4 位作者 刘新宇 于进勇 王润梅 徐安怀 齐鸣 《Journal of Semiconductors》 CAS 北大核心 2006年第3期434-437,共4页
A self-aligned InP/GalnAs single heterojunction bipolar transistor（HBT） is investigated using a novel T-shaped emitter. A U-shaped emitter layout,selective wet etching,laterally etched undercut, and an air-bridge ar... A self-aligned InP/GalnAs single heterojunction bipolar transistor（HBT） is investigated using a novel T-shaped emitter. A U-shaped emitter layout,selective wet etching,laterally etched undercut, and an air-bridge are applied in this process. The device, which has a 2μm×12μm U-shaped emitter area,demonstrates a common-emitter DC current gain of 170,an offset voltage of 0.2V,a knee voltage of 0.5V, and an open-base breakdown voltage of over 2V. The HBT exhibits good microwave performance with a current gain cutoff frequency of 85GHz and a maximum oscillation frequency of 72GHz, These results indicate that these InP/InGaAs SHBTs are suitable for low-voltage,low-power,and high-frequency applications. 展开更多
关键词 self-alignment emitters InP single heterojunction bipolar transistor T-shaped emitter U-shaped emitter layout
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Variation of hydraulic parameters with different wing of a T-shape spur dike in bend channels 认领 引用 被引量：2
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作者 Mohammad Vaghefi Arash Ahmadi Behroz Faraji 《Journal of Central South University》 SCIE EI CAS CSCD 2018年第3期671-680,共10页
In the present research,by using a numerical model,some analyses were performed on flows around a T-shape spur dike and a support structure located at its upstream under different wing to length ratios of T-shape spur... In the present research,by using a numerical model,some analyses were performed on flows around a T-shape spur dike and a support structure located at its upstream under different wing to length ratios of T-shape spur dike in the order of 0.25,0.50,0.75 and 1.00.In order to verify numerical model,physical model data were used in presence of a single T shape spur dike.Results from numerical model are desirably in agreement with those of physical one because the regression between both data is 0.86 up to 0.92.In this research,all hydraulic parameters of flows,streamlines and dimensions of flow separation zones were studied in order to select the most practical model.Increased W/L results in 7%–12%increase in the length of flow separation zone and in 2%increase in the width of this zone compared to W/L=0.25. 展开更多
关键词 numerical model wing of T-shape spur dike support structure flow pattern
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A method for coastal oil tank detection in polarimetric SAR images based on recognition of T-shaped harbor 认领 引用 被引量：1
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作者 LIU Chun XIE Chunhua +2 位作者 YANG Jian XIAO Yingying BAO Junliang 《Journal of Systems Engineering and Electronics》 SCIE CSCD 2018年第3期499-509,共11页
To automatically detect oil tanks in polarimetric synthetic aperture radar（SAR） images, a coastal oil tank detection method is proposed based on recognition of T-shaped harbor. First of all, the T-shaped harbor is d... To automatically detect oil tanks in polarimetric synthetic aperture radar（SAR） images, a coastal oil tank detection method is proposed based on recognition of T-shaped harbor. First of all, the T-shaped harbor is detected to locate the region of interest（ROI） of oil tanks. Then all suspicious targets in the ROI are extracted by the segmentation of strong scattering targets and the classifier of H/α. The template targets are selected from the suspicious targets by the combination of a proposed circular degree parameter and the similarity parameter（SP） of the polarimetric coherency matrix. Finally, oil tanks are detected according to the statistics of the similarity parameter between each suspicious target and template targets in ROI. Polarimetric SAR data acquired by RADARSAT-2 over Berkeley and Singapore areas are used for testing. Experiment results show that most of the targets are correctly detected and the overall detection rate is close to 80%.The false rate is effectively reduced by the proposed algorithm compared with the method without T-shaped harbor recognition. 展开更多
关键词 oil tank detection T-shaped harbor recognition polarimetric synthetic aperture radar（SAR）
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T-Shaped Transmission Line Fault Location Based on Phase-Angle Jump Checking 认领 引用 被引量：1
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作者 Jia’an Xie YurongWang +1 位作者 Guobin Jin Mucheng Wu 《Energy Engineering》 EI 2022年第5期1797-1809,共13页
In order to effectively solve the dead-zone and low-precision of T-shaped transmission line fault location,a new T-shaped transmission line fault location algorithm based on phase-angle jump checking is proposed in th... In order to effectively solve the dead-zone and low-precision of T-shaped transmission line fault location,a new T-shaped transmission line fault location algorithm based on phase-angle jump checking is proposed in this paper.Firstly,the 3-terminal synchronous fundamental positive sequence voltage and current phasors are extracted and substituted into the fault branch distance function to realize the selection of fault branch when the fault occurs;Secondly,use the condition of the fundamental positive sequence voltage phasor at the fault point is equal to calculate all roots(including real root and virtual roots);Finally,the phase-angle jump check function is used for checking calculation,and then the only real root can be determined as the actual fault distance,thereby achieving the purpose of high-precision fault location.MATLAB simulation results show that the proposed new algorithm is feasible and effective with high fault location accuracy and good versatility. 展开更多
关键词 T-shaped transmission line fault location real root and virtual roots phase-angle jump check function
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Kondo-Fano Effect in T-shaped Double Quantum Dots Coupled to Ferromagnetic Leads 认领 引用 被引量：1
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作者 HUANG Rui WU Shao-Quan HOU Tao 《Communications in Theoretical Physics》 SCIE CAS CSCD 2012年第1期161-165,共5页
Using an equation-of-motion technique, we theoretically study the Kondo-Fano effect in the T-shaped double quantum dots coupled to two ferromagnetic leads by the Anderson Hamiltonian. We calculate the density of state... Using an equation-of-motion technique, we theoretically study the Kondo-Fano effect in the T-shaped double quantum dots coupled to two ferromagnetic leads by the Anderson Hamiltonian. We calculate the density of states in this system by solving Green function. Our results reveal that the density of states show some noticeable characteristics not only depending upon the interdot coupling tab, the energy level eal of the side coupled quantum dot QDb, and the relative angle θ of magnetic moment M, but also the asymmetry parameter a in ferromagnetic leads and so on. All these parameters greatly influence the density of states of the eentral quantum dot QDa. This system is a possible candidate for spin valve transistors and may have potential applications in the spintronies. 展开更多
关键词 T-shaped double quantum dots Kondo-Fano effect density of states
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SYNTHESIS AND CHARACTERIZATION OF LIQUID CRYSTAL POLYESTERS WITH T-SHAPED TWO-DIMENSIONAL MESOGENIC UNITS(Ⅲ) 认领 引用 被引量：2
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作者 周其凤 《Chinese Journal of Polymer Science》 SCIE CAS 1999年第5期483-490,共8页
A new series of liquid crystal polyesters with T-shaped two-dimensional mesogenic units weresynthesized by melt polycondensation of the diacetates of 2-(4'-alkoxy -phenyl)-hydroquinones with 4,4'-alkylenedioxy... A new series of liquid crystal polyesters with T-shaped two-dimensional mesogenic units weresynthesized by melt polycondensation of the diacetates of 2-(4'-alkoxy -phenyl)-hydroquinones with 4,4'-alkylenedioxydibenzoic acid. The polymers were characterized by using polarized microscopy, DSC and X-ray diffraction. It was realized that all the polymers have nematic thermotropic liquid crystallinecharacteristics. The melting temperature (T_m) and isotropization temperature (T_i) of the polymers changeregularly with varying lengths of the alkoxy side group and the length of the alkylene group in the main chainin company with an even-odd effect. The mesophase temperature range also varies regularly with the polymerstructure. It is shown that the mesophase range has been widened. 展开更多
关键词 T-shaped two-dimensional mesogenic units Liquid crystal polyester Synthesis and characterization
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SYNTHESIS AND CHARACTERIZATION OF LIQUID CRYSTAL POLYMERS WITH T-SHAPED TWO-DIMENSIONAL MESOGENIC UNITS 认领 引用
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作者 李自法 陈志军 +2 位作者 张淑媛 曹少魁 周其凤 《Chinese Journal of Polymer Science》 SCIE EI CAS 1996年第1期71-79,共9页
Two series of new liquid crystalline polymers with T-shaped two-dimensional mesogenic units were synthesized by low temperature solution polycondensations of 4-substituted N-2, 5-dihydroxybenzylidene aniline monomers ... Two series of new liquid crystalline polymers with T-shaped two-dimensional mesogenic units were synthesized by low temperature solution polycondensations of 4-substituted N-2, 5-dihydroxybenzylidene aniline monomers with different diacyl dichlorides. The polymers were found to be nematic and shown liquid crystalline behavior. The melting temperature T-m and the clearing temperature T-i of the polymers change regularly with varying of the monomer structures. 展开更多
关键词 liquid crystal polymer T-shaped two-dimensional mesogenic unit N-2, 5-dihydroxybenzylidene-4-substituted aniline
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Optimization of ambipolar current and analog/RF performance for T-shaped tunnel field-effect transistor with gate dielectric spacer 认领 引用
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作者 Ru Han Hai-Chao Zhang +1 位作者 Dang-Hui Wang Cui Li 《Chinese Physics B》 SCIE EI CAS CSCD 2019年第1期656-662,共7页
A new T-shaped tunnel field-effect transistor(TTFET) with gate dielectric spacer(GDS) structure is proposed in this paper. To further studied the effects of GDS structure on the TTFET, detailed device characteristics ... A new T-shaped tunnel field-effect transistor(TTFET) with gate dielectric spacer(GDS) structure is proposed in this paper. To further studied the effects of GDS structure on the TTFET, detailed device characteristics such as current-voltage relationships, energy band diagrams, band-to-band tunneling(BTBT) rate and the magnitude of the electric field are investigated by using TCAD simulation. It is found that compared with conventional TTFET and TTFET with gate-drain overlap(GDO) structure, GDS-TTFET not only has the minimum ambipolar current but also can suppress the ambipolar current under a more extensive bias range. Furthermore, the analog/RF performances of GDS-TTFET are also investigated in terms of transconductance, gate-source capacitance, gate-drain capacitance, cutoff frequency, and gain bandwidth production. By inserting a low-κ spacer layer between the gate electrode and the gate dielectric, the GDS structure can effectively reduce parasitic capacitances between the gate and the source/drain, which leads to better performance in term of cutoff frequency and gain bandwidth production. Finally, the thickness of the gate dielectric spacer is optimized for better ambipolar current suppression and improved analog/RF performance. 展开更多
关键词 tunneling field effect transistor T-shaped tunnel field-effect transistor gate dielectric spacer ambipolar current analog/RF performance
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Novel Preparation of Magnetic Microcapsules by Using T-Shaped Microchannel Reactor 认领 引用
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作者 陈红苗 刘鹏 +1 位作者 钟毅 罗艳 《Journal of Donghua University(English Edition)》 EI CAS 2013年第1期63-67,共5页
Traditional preparation of magnetic microcapsules involves cumbersome processes and often results in irregular-shaped products. Due to the stable laminar flow of reaction solution and the moderate reaction conditions,... Traditional preparation of magnetic microcapsules involves cumbersome processes and often results in irregular-shaped products. Due to the stable laminar flow of reaction solution and the moderate reaction conditions, the T-shaped microchannel (T-MC) reactor is supposed to yield microcapsules with regular shape. In this paper, magnetic particles of ferroferric oxide modified by oleic acid (OA-Fe3O4) and dispersed in tetrachloroethylene were used as core material. Polymethyl methacrylate (PMMA) was used as shell material. Magnetic microcapsules were prepared by using a T-MC reactor. Factors that influenced the encapsulated reaction were investigated in details, which included the velocity ratio of aqueous phase to oil phase, the length and the inner diameter of the microchannel. The morphology, composition, and magnetic responsiveness of the magnetic microcapsules were analyzed and characterized by SEM, FTIR, XRD, TGA, and vibrating sample magnetometer (VSM). The results confirmed that magnetic microcapsules prepared by T-MC reactor were regular in shape. 展开更多
关键词 modified ferroferric oxide T-shaped microchannel (T-MC) reactor magnetic microcapsules morphology characterization
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