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颗粒存在对网栅后气相流动湍流特性的影响

应用力学学报 2000年第1期17卷 36-40页

作者：李玲徐忠西安交通大学西安710049

应用 L DV测试技术对方管内网栅后的气固两相流动 ,在颗粒平均粒径 Dp =0 .2 1 mm,颗粒质量浓度为 0 .2 4%、0 .36 % ;Dp =0 .35 mm,颗粒质量浓度为 0 .1 2 %、0 .2 1 %、0 .335 % ;Dp =0 .6 mm,颗粒质量浓度为 0 .1 6 %、0 .2 45 %、0 ... 详细信息

应用 L DV测试技术对方管内网栅后的气固两相流动 ,在颗粒平均粒径 Dp =0 .2 1 mm,颗粒质量浓度为 0 .2 4%、0 .36 % ;Dp =0 .35 mm,颗粒质量浓度为 0 .1 2 %、0 .2 1 %、0 .335 % ;Dp =0 .6 mm,颗粒质量浓度为 0 .1 6 %、0 .2 45 %、0 .34 5 % ;Dp =0 .9mm,颗粒质量浓度为 0 .2 0 5 %、0 .30 %多种工况下进行了测量 ,得出各种工况下气流脉动速度、湍动能沿流动方向的衰减规律 ,通过与纯气流条件下的实验结果比较 ,分析了颗粒浓度及颗粒尺寸对网栅后气相流动湍流特性的影响。根据测量结果 ,提出了一个在有固相颗粒存在时 ,关于湍流模型方程中模型常数 C2的修定方法。

关键词：气固两相流动颗粒浓度颗粒尺寸湍流模型

Corrosion Behavior of Welded Joints for Cargo Oil Tanks of Crude Oil Carrier

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Journal of Iron and Steel Research International 2016年第9期23卷 955-962页

作者： Jin-shan WeI Yan-chang QI Zhi-ling TIAN Yun PeNG State Key Laboratory of Advanced Steel Processes and Products Central Iron & Steel Research Institute

e32 grade corrosion resistant steel was welded with welding wires with three different S contents. The mi crostructure, mechanical properties, inclusions, and corrosion behavior of welded joint were investigated. The joint coupon corrosion test and potentiodynamic polarization test were carried out under the simulated corrosion environ- ment of the inner bottom plates of cargo oil tanks. The pitting initiation and propagation mechanism of the weld metal were studied by scanning electron microscopy and infinite focus. The results indicated that the microstructures of three kinds of weld metals are all composed of acicular ferrite, ferrite side-plate and proeutectoid ferrite. The micro- structure of heat affected zone is composed predominantly of bainite. Joint welded with low S filler wire has good me- chanical properties. S can decrease free corrosion potential and increase the corrosion tendency. The pitting initiation is oxide inclusion or sulfide oxide inclusion complex. S can induce the formation of occluded area and promote the corrosion propagation. The chemical compositions of weld metal is similar to base metal, which can limit the galvanic corrosion between weld metal and base metal, and avoid formation of corrosion step.

关键词： cargo oil tank welded joint pit corrosion corrosion step

Pillararene-based supramolecular systems for theranostics and bioapplications

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Science China Chemistry 2021年第5期64卷 688-700页

作者： Huangtianzhi Zhu Qi li Laila e.Khalil-Cruz Niveen M.Khashab Guocan Yu Feihe Huang State Key Laboratory of Chemical engineering Key Laboratory of Excited-State Materials of Zhejiang ProvinceDepartment of ChemistryZhejiang UniversityHangzhou 310027China Smart Hybrid Materials Laboratory(SHMs) Advanced Membranes and Porous Materials CenterKing Abdullah University of Science and Technology(KAUST)Thuwal 23955-6900Saudi Arabia Green Catalysis Center and College of Chemistry Zhengzhou UniversityZhengzhou 450001China

As an emerging type of important macrocycles for supramolecular chemistry,pillararenes and their derivatives have been widely studied and applied in numerous fields,which intensively promotes the development of chemistry,materials science and ***-based theranostic systems are of special interest in the biological and medical areas as they have shown very promising *** to easy preparation,reliable guest affinity,good biocompatibility and stability,pillararenes are frequently used to construct functional *** one hand,pillararenes can either be used individually or form diversiform self-assemblies such as micelles,nanoparticles and vesicles to increase water solubility and biocompatibility of *** the other hand,it is promising to modify solid materials like framework materials,silica nanoparticles and graphene oxides with pillararene derivatives to enhance their functions and *** this review,we summarize recent endeavors of pillararene-based supramolecular systems with theranostics and other biological applications comprising drug delivery/chemotherapy,photodynamic/photothermal therapy,antimicrobials,bioimaging,*** introducing several typical examples,the design principles,preparation strategies,identifications and bio-applications of these pillararene-based supramolecular systems are *** challenges and directions of this field are also outlined.

关键词： pillararenes self-assembly theranostics drug delivery supra-amphiphiles

High-resolution ARPeS endstation for in situ electronic structure investigations at SSRF

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Nuclear Science and Techniques 2021年第3期32卷 94-106页

作者： Yi-Chen Yang Zheng-Tai liu Ji-Shan liu Zhong-Hao liu Wan-ling liu Xiang-Le Lu Hong-Ping Mei Ang li Mao Ye Shan Qiao Da-Wei Shen State Key Laboratory of Functional Materials for Informatics Shanghai Institute of Microsystem and Information TechnologyChinese Academy of SciencesShanghai 200050China University of Chinese Academy of Sciences Beijing 100049China

Angle-resolved photoemission spectroscopy(ARPeS)is one of the most powerful experimental techniques in condensed matter *** ARPeS,which uses photons with high flux and continuously tunable energy,has become particularly ***,an excellent synchrotron ARPeS system must have features such as a small beam spot,super-high energy resolution,and a user-friendly operation interface.A synchrotron beamline and an endstation(BL03 U)were designed and constructed at the Shanghai Synchrotron Radiation *** beam spot size at the sample position is 7.5(V)μm×67(H)μm,and the fundamental photon range is 7-165 eV;the ARPeS system enables photoemission with an energy resolution of 2.67 meV at21.2 *** addition,the ARPeS system of this endstation is equipped with a six-axis cryogenic sample manipulator(the lowest temperature is 7 K)and is integrated with an oxide molecular beam epitaxy system and a scanning tunneling microscope,which can provide an advanced platform for in situ characterization of the fine electronic structure of condensed matter.

关键词： Synchrotron ARPeS In situ VUV laser Quantum materials

Feasibility of Femtosecond Laser Writing Multi-Layered Bit Planes in Fused Silica for Three-Dimensional Optical Data Storage

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Chinese Physics Letters 2001年第4期18卷 541-543页

作者： li Cheng-De WANG Dan-ling LUO Le YANG Hong XIA Zong-Ju GONG Qi-Huang State Key Laboratory for Mesoscopic Physics and Department of Physics Peking UniversityBeijing 100871

The ultrashort pulse laser writing multi-layered data bits in fused silica for three-dimensional optical data storage through the mechanism of optical damage induced by multi-photon absorption is *** 800 nm,120 fs Ti:Sapphire laser beam is focused into cubic samples with a 0.65 NA commercial microscope *** size of the recorded bits can be smaller than 0.5 × 0.5 × 2.5μm as the laser pulse energy is lower than 300 nJ and the corresponding bit data storage density is 0.2 × 10^(12) Tbits/cm^(3).Due to the aberration produced by the mismatch of the refractive indices between the recording material and its immersion medium,the longitudinal size of the recorded bit increases and the contrast of the bit to surrounding uninfected zone decreases as the bit plane gets *** a relatively lower storage density of 0.05 × 10^(12) Tbits/cm3 is realized.

关键词： Femto ultrashort Storage

Adaptive Fault-tolerant Control of Automotive Suspension with Actuator Saturation and L2-disturbances

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Adaptive Fault-tolerant Control of Automotive Suspension wit...

Collision Analysis Between Spudcan and Seabed During the Process of Jack-up Platform Lowering Jack-up Legs

第26届中国控制与决策会议

作者： Wei Guan Qian li ling Guo School of Automation Shenyang Aerospace University

Suspension is one of the important parts of automobile which has a great influence on the comfort of riding,the stability of handling and the control of vehicle s *** the simple two degree of freedom of a quarter of the simplified model of automotive suspension, we use the fixed-gain control and the adaptive control to design the controller. Making use of the MATLAB simulation, the scientific data shows that the adaptive control has a better effect.

关键词： Automotive suspension Saturation and fault tolerance Adaptive control Disturbance tolerance

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China Ocean engineering 2021年第5期35卷 779-788页

作者： Le Cong-huan li Yan-e HUANG Lei ReN Jian-yu DING Hong-yan ZHANG Pu-yang State Key Laboratory of Hydraulic engineering Simulation and Safety Tianjin UniversityTianjin 300072China School of Civil engineering Tianjin UniversityTianjin 300072China China Classification Society(CCS) Tianjin 300457China

In the leg-lowering process,the offshore jack-up platform is in a floating state,and the spudcan may collide with the seabed due to the platform motion in waves,thereby threatening the safety and stability of the *** paper first analyzed the hydrodynamic response of a jack-up platform under different sea *** a finite-element model was established which considered the material and geometrical nonlinearity in the structure and the nonlinear interaction between soil and structure to investigate the collision response between the spudcan and seabed during lowering jack-up *** results show that the dynamic response of the platform decreases and gradually tends to be stable as the wave period *** motion response of the platform reach the largest value when the wave period is 8 s and the wave direction is 0°.The collision angle between the spudcan and seabed has a large influence on the collision response,while the velocity of leg-lowering has little influence on the collision *** collision response is also significantly affected by soil *** clay,the increase in undrained shear strength and Young’s modulus will increase the impact force.

关键词： jack-up platform spudcan collision dynamic response

Research on Calibration Method of Infrared Test equipment(Calibration Method of Infrared Radiometer and Infrared Thermal Imager)

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Research on Calibration Method of Infrared Test Equipment(Ca...

Initial study of magnetic resonance diffusion tensor imaging in brain white matter of early AIDS patients

第26届中国控制与决策会议

作者： Wei Guan ling Guo li Fu Shenyang Aerospace University

ISBN: (纸本)9781479937097

Infrared measuring device is a device used for infrared radiation characteristic measurement. It is widely applied to each field of the military, industrial, medical, agriculture and forestry in our production life. The calibration of infrared measuring equipment directly affects the system error and the test precision of the instrument, so establish the feasible and effective calibration method, has become a work that can’t be ignored. In this paper, the calibration method of infrared measuring equipment were systematically reviewed, and analyzed the advantages and disadvantages of various calibration method;Summarizes the difficulties in calibration process;Finally draws the conclusion, that is the future development direction of this technology.

关键词： infrared radiometer infrared thermal imager calibration method

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Chinese Medical Journal 2013年第14期126卷 2720-2724页

作者： XUAN Ang WANG Guang-bin SHI Da-peng XU Jun-ling li Yong-li Shangdong University Jinan Shandong 250100 China Department of Radiology the People's Hospital of Zhengzhou University Zhengzhou Henan 450003 China Shandong Medical Imaging Research Institute Jinan Shandong 250021 China

Background HIV is a neurotropic virus which can cause brain white matter demyelination, gliosis, and other pathological changes that appear as HIV encephalitis or AIDS dementia. The purpose of this study was to investigate the change of the diffused condition of water molecules in brain white matter in early acquired immune deficiency syndrome （AIDS） patients using MR diffusion tensor imaging （DTI）. Methods DTI examinations were performed on a Siemens 3.0T MR scanner in 23 AIDS patients with normal brain appearance by conventional MRI and 20 healthy volunteers as the control group. Fractional anisotropy （FA） and apparent diffusion coefficient （ADC） values were measured in nine regions; corpus callosum （CC） knee, CC body, CC splenium, periventricular white matter, frontal lobe white matter, parietal lobe white matter, occipital lobe white matter, and the anterior and posterior limbs of the internal capsule. The mean FA and ADC values from each region were compared in three groups： the symptomatic, asymptomatic and the control. Results The mean FA values were significantly lower and the mean ADC values were significantly higher in all nine regions in patients in the symptomatic group than in the asymptomatic and control group patients. In the asymptomatic group, the mean FA values were significantly lower and the mean ADC values were significantly higher at the CC knee, CC body, CC splenium, periventricular white matter, frontal lobe white matter and parietal lobe white matter, than in the control group. There were no significant differences at other regions between the two groups. Conclusions The diffused changes of water molecules in brain white matter in AIDS patients are related to brain white matter regions. DTI examination can detect the brain white matter lesions early in AIDS patients.

关键词： acquired immune deficiency syndrome fractional anisotropy magnetic resonance imaging diffusion tensor imaging