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STUDIES　ON　THE　MAGNETIC　RESONANCE　CONTRAST　AGENTS　SyNTHESIS　AND　SPIN－LATTICE　RELAXIVITy　OF　AMINO　ACIDS　AND　OLIGOPEPTIDyL　DERIVATIVES　OF　GD－DTPA

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Chinese Chemical Letters 1995年第5期6卷 377-378页

作者： luo, y Zhuo, RX Fan, CL Beijing Univ Dept Chem Beijing 100871 Peoples R China Wuhan Univ Dept Chem Wuhan 430072 Peoples R China

A series of amino acids and oligopeptidyl derivatives of GdDTPA were *** structure of these chelates were confirmed by IR and elementary analysis .Toxicity of chelates was almost the same as Gd-DTPA. The spin- lattic... 详细信息

关键词： DTPA GD AGENTS ACIDS

SUSTAINED RELEASE OF LEVONORGESTREL USING POLyPHOSPHATE AS DRUG CARRIER

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Chinese Chemical Letters 1995年第4期6卷 333-334页

作者： luo, y Zhuo, RX Fan, CL Beijing Univ Dept Chem Beijing 100871 Peoples R China Wuhan Univ Dept Chem Wuhan 430072 Peoples R China

A novel crosslinking polyphosphate was synthesized. The polymer was characterized by FT-IR, (HNMR)-H-1, (PNMR)-P-31 nd elemental analysis, In vitro release of Levonorgestrel by single-matrix and sandwich pellet with polyphosphate as drug carrier were carried out in pH 7.4 phosphate buffer solution at 37 degreesC, Sustained release rate from-the sandwich pellet was more controlled than that from single-matrix pellet.

关键词： AS SUSTAINED RELEASE OF LEVONORGESTREL USING POLyPHOSPHATE AS DRUG CARRIER

Cooper　and　Zinc　Superoxide　dismutase　from　Peking　duck　erythrocytes　forms　a　supramolecular　double－helix　in　the　crystal

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Chinese Chemical Letters 1996年第10期7卷 939-941页

作者： Li, PW luo, y Li, GP Shao, MC BEIJING UNIV DEPT CHEMBEIJING 100871PEOPLES R CHINA

The charge isomer fraction(PI 5.9) of the Cu. Zn SOD from duck red blood cell has been crystallized around neutral pH and low ionic strength at 297°*** crystals belong to the trigonel space group P3221, with unit cell a=125.1,c=163.3 and γ=120°. The duck SOD shows a novel packing arrangement consisting of supramolecular double-helix, with 922/972 non-crystallographic border group symmetry in the crystal.

关键词： Peking dismutase duck Superoxide and Cooper

COMPUTER-AID ANALySIS FOR CRACKING OF 280 CONNECTING ROD OF 16V280ZJ DIESEL LOCOMOTIVE ON QUENCHING PROCESS

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Acta Metallurgica Sinica(English Letters) 2004年第1期17卷 83-91页

作者： J.S.ye A.yang y.luo Hangzhou Iron & Steel Group Co.Technology Center.Hangzhou 310022 ChinaZiyang Internal-Combustion Plant of Sichuang Ziyang 641000 ChinaZiyang Internal-Combustion Plant of Sichuang Ziyang 641000 China

280 connecting rod is one of the most important parts for 16V280ZJ diesel locomotive, so it needs much better mechanical performance. However, the crack is often generated at the middle section of connecting rod body on heat treatment process. A temperature-phase transformation-stress coupled 3D non-linear mathematical model has been developed to analyze the reasons of cracking. The simulation and experimental results show that the compressive stress on the cracking position is close to the fracture stress of connecting rod and the reasons of crack are mainly contributed to the carbon content excess of original material or the aging of quenchant.

关键词： crack phase transformation non-linear compressive stress

Magnetohydrodynamic flows tuning in a conduit with multiple channels under a magnetic field applied perpendicular to the plane of flow

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Journal of Hydrodynamics 2017年第2期29卷 332-343页

作者： y.luo C.N.Kim M.Q.Zhu Department of Mechanical Engineering Graduate SchoolKyung Hee UniversityYong-inKorea Department of Mechanical Engineering College of EngineeringKyung Hee UniversityYong-inKorea

In this study, three-dimensional liquid-metal magnetohydrodynamic flows in a conduit with multiple channels under a uniform magnetic field are numerically investigated. The geometry of the conduit is of a four-parallel-channels system including one inflow channel and three outflow channels. The liquid-metal flows into the inflow channel, then turns through 180° in the transi- tion segment, finally flows into three different outflow channels. This kind of channel system can induce counter flow and co-flow, which is rarely investigated before though the conceptual designs of duct flow in the blanket have suggested this type of flow. A structured grid system is chosen after a series of mesh independence tests in the present study. The axial velocity in the side layer near the first partitioning wall, located between the inflow channel and the first outflow channel, is the highest with the lowest electric potential formed therein. The pressure almost linearly decreases in the main flow direction, except in the transition segment. Moreover, the pressure gradient in the first outflow channel is the largest among the three outflow channels. The interdependency of the current, fluid velocity, pressure, electric potential is examined in order to describe the electromagnetic characteristics of the liquid-metal flows.

关键词： Liquid-metal magnetohydrodynamics multiple channels

Cracking evolution behaviors of lightweight materials based on in situ synchrotron X-ray tomography： A review

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Frontiers of Mechanical Engineering 2018年第4期13卷 461-481页

作者： y. luo S. C. Wu y. N. Hu y. N. Fu State Key Laboratory of Traction Power Southwest Jiaotong University Chengdu 610031 China Shanghai Synchrotron Radiation Facility Shanghai 201204 China

Damage accumulation and failure behaviors are crucial concerns during the design and service of a critical component, leading researchers and engineers to thoroughly identifying the crack evolution. Third-generation synchrotron radiation X-ray computed microtomo- graphy can be used to detect the inner damage evolution of a large-density material or component. This paper provides a brief review of studying the crack initiation and propagation inside lightweight materials with advanced synchrotron three-dimensional （3D） X-ray imaging, such as aluminum materials. Various damage modes under both static and dynamic loading are elucidated for pure aluminum, aluminum alloy matrix, aluminum alloy metal matrix composite, and aluminum alloy welded joint. For aluminum alloy matrix, metallurgical defects （porosity, void, inclusion, precipitate, etc.） or artificial defects （notch, scratch, pit, etc.） strongly affect the crack initiation and propagation. For aluminum alloy metal matrix composites, the fracture occurs either from the particle debonding or voids at the particle/matrix interface, and the void evolution is closely related with fatigued cycles. For the hybrid laser welded aluminum alloy, fatigue cracks usually initiate from gas pores located at the surface or sub-surface and gradually propagate to a quarter ellipse or a typical semi-ellipse profile.

关键词： fatigue crack initiation and growth fatigue damage mechanism damage tolerance defect characterization laser welded aluminum alloys

De Novo Design and Synthesis of Four-Helix Bundle Peptides

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Chinese Chemical Letters 1996年第9期7卷 809-811页

作者： Li, XQ Miao, ZW luo, y Li, CX Tang, yQ BEIJING UNIV DEPT CHEMBEIJING 100871PEOPLES R CHINA

Two peptides (LI22 and LI29) designed to form four-helix bundle were synthesized by stepwise solid phase peptide synthesis (SPPS) using Fmoc strategy, purified by reversed phase high performance liquid chromatography ... 详细信息

关键词： Design Four De Novo Design and Synthesis of Four-Helix Bundle Peptides

HI in High Gas-phase Metallicity Dwarf Galaxy WISEA J230615.06+143927.9

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Research in Astronomy and Astrophysics 2024年第1期24卷 292-299页

作者： yan Guo C.Sengupta T.C.Scott P.Lagos y.luo Purple Mountain Observatory Chinese Academy of SciencesNanjing 210023China School of Astronomy and Space Sciences University of Science and Technology of ChinaHefei 230026China Institute of Astrophysics and Space Sciences(IA Porto) Rua das Estrelas4150-762PortoPortugal

We present resolved Giant Metrewave Radio Telescope H I observations of the high gas-phase metallicity dwarf galaxy WISEA J230615.06+143927.9(z = 0.005)(hereafter J2306) and investigate whether it could be a Tidal Dwarf Galaxy(TDG) candidate. TDGs are observed to have higher metallicities than normal dwarfs. J2306 has an unusual combination of a blue g-r color of 0.23 mag, irregular optical morphology and high-metallicity(12 +log(O/H) = 8.68 ± 0.14), making it an interesting galaxy to study in more detail. We find J2306 to be an H I rich galaxy with a large extended, unperturbed rotating H I disk. Using our H I data we estimated its dynamical mass and found the galaxy to be dark matter(DM) dominated within its H I radius. The quantity of DM, inferred from its dynamical mass, appears to rule out J2306 as an evolved TDG. A wide area environment search reveals J2306 to be isolated from any larger galaxies which could have been the source of its high gas metallicity. Additionally, the H I morphology and kinematics of the galaxy show no indication of a recent merger to explain the *** detailed optical spectroscopic observations of J2306 might provide an answer to how a seemingly ordinary irregular dwarf galaxy achieved such a high level of metal enrichment.

关键词： galaxies:abundances galaxies:dwarf galaxies:irregular radio lines:galaxies radio lines:ISM

Value of ultrasound examination in differential diagnosis of pancreatic lymphoma and pancreatic cancer

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World Journal of Gastroenterology 2008年第43期14卷 6738-6742页

作者： Li Qiu yan luo yu-Lan Peng Department of Ultrasound,West China Hospital of Sichuan University,Chengdu 610041,Sichuan Province,China Author contributions:Qiu L and luo y designed the research Qiu L,luo y and Peng yL did the ultrasound examination Qiu L and Peng yL collected the data Qiu L and luo y drafted and revised the manuscript and approved the final version. Department of Ultrasound West China Hospital of Sichuan University Chengdu 610041 Sichuan Province China. wsqiuli@***

AIM： To investigate the value of clinical manifestations and ultrasound examination in the differential diagnosis of pancreatic lymphoma and pancreatic cancer. METHODS： The clinical and ultrasonic characteristics of 12 cases of pancreatic lymphoma and 30 cases of pancreatic cancer were retrospectively analyzed. RESULTS： Statistically significant differences were found in the course of disease, back pain, jaundice, carcino-embryonic antigen （CEA） and CA19-9 increase, palpable abdominal lump, superficial lymph node enlargement, fever and night sweats, lesion size, bile duct expansion, pancreatic duct expansion, vascular involvement, retroperitoneal （below the renal vein level） lymph node enlargement, and intrahepatic metastasis between pancreatic lymphoma and pancreatic cancer. There were no significant differences in age of onset, gender ratio, weight loss, nausea and vomiting, lesion position, the echo of the lesion, and the blood flow of the lesion. CONCLUSION： Pancreatic lymphoma should be considered for patients with long lasting symptoms, superficial lymph node enlargement, palpable abdominal lump, fever and night sweats, relatively large lesions, and retroperitoneal （below the level of the renal vein） lymph node enlargement. A diagnosis of pancreatic cancer should be considered more likely in the patients with relatively short disease course, jaundice, back pain, CEA and CA19-9 increase, relatively small lesions, bile duct expansion, obvious pancreatic duct expansion, peripheral vascular wrapping and involvement, or intrahepatic metastases.

关键词： Ultrasound Pancreatic lymphoma Pancreatic cancer