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Effects of Heat Treatment Process Parameters on Microstructure and Mechanical Properties of DP440Cold Rolled Strip

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Journal of Iron and Steel Research International 2014年第5期21卷 509-516页

作者： Gang HUO Yi-ming CEN zhen-xing LI Guo-dong LI Chang-sheng LI State Key Laboratory of Rolling and Automation Northeastern University Pohang Cold Strip Rolling Co. Ltd.

In order to optimize the production process, improve the production efficiency and accelerate the development and application of the domestic dual-phase steel, the effects of heat treatment process parameters on microstructure and mechanical properties of DP440 cold rolled strip were studied by the CAS-300 simulated continuous annealing equipment. When the heating rate increased from 5 to 100 ℃/s, both the tensile strength and yield strength increased because of the decreased grain size. When the intercritical annealing temperature increased from 780 to 850 ℃, the martensite content decreased so that the tensile strength decreased first, then increased, and the yield strength increased. When the rapid cooling rate increased from 25 to 100 ℃/s, because the martensite content increased, the tensile strength increased, while the yield strength decreased. When the overaging temperature increased from 260 to 400 ℃, the tensile strength decreased, while the yield strength increased. When the overaging time increased from 240 to 480 s, the tensile strength decreased a little, while the yield strength increased a little.

关键词： dual-phase steel heat treatment microstructure mechanical property

LB-AGR: level-based adaptive geo-routing for underwater sensor network

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The Journal of China Universities of Posts and Telecommunications 2014年第1期21卷 54-59页

作者： DU Xiu-juan HUANG Ke-jun LAN Sheng-lin FENG zhen-xing LIU Fan School of Computer Science Qinghai Normal University Network Information Center Qinghai Normal University

Underwater sensor network（UWSN） adopts acoustic communication with more energy-consumption and longer propagation-delay, which bring great challenges to protocol design. In this paper, we proposed level-based adaptive geo-routing（LB-AGR） protocol. LB-AGR divides traffics into four categories, and routes different types of traffic in accordance with different decisions. Packets upstream to the sink are forwarded unicast to the best next-hop instead of broadcasting to all neighbor nodes as in present UWSN routing protocols. LB-AGR defines an integrated forwarding factor for each candidate node based on available energy, density, location, and level-difference between neighbor nodes, which is used to determine the best next-hop among multiple qualified candidates. Through simulation experiments, we show the promising performance of LB-AGR.

关键词： UWSN LB-AGR node level neighbor table

Research progress in artificial intelligence assisted diabetic retinopathy diagnosis

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International Journal of Ophthalmology(English edition) 2023年第9期16卷 1395-1405页

作者： Yun-Fang Liu Yu-Ke Ji Fang-Qin Fei Nai-Mei Chen zhen-Tao Zhu xing-zhen Fei Department of Ophthalmology First People’s Hospital of HuzhouHuzhou UniversityHuzhou 313000Zhejiang ProvinceChina Eye Hospital Nanjing Medical UniversityNanjing 210000Jiangsu ProvinceChina Department of Endocrinology First People’s Hospital of HuzhouHuzhou UniversityHuzhou 313000Zhejiang ProvinceChina Department of Ophthalmology Huai’an Hospital of Huai’an CityHuai’an 223000Jiangsu ProvinceChina

Diabetic retinopathy(DR)is one of the most common retinal vascular diseases and one of the main causes of blindness *** detection and treatment can effectively delay vision decline and even blindness in patients with *** recent years,artificial intelligence(AI)models constructed by machine learning and deep learning(DL)algorithms have been widely used in ophthalmology research,especially in diagnosing and treating ophthalmic diseases,particularly *** DR,AI has mainly been used in its diagnosis,grading,and lesion recognition and segmentation,and good research and application results have been *** study summarizes the research progress in AI models based on machine learning and DL algorithms for DR diagnosis and discusses some limitations and challenges in AI research.

关键词： diabetic retinopathy artificial intelligence machine learning deep learning diagnosis grading lesions segmentation

Effect of high intensity ultrasound on the allergenicity of shrimp

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Journal of Zhejiang University-Science B(Biomedicine & Biotechnology) 2006年第4期7卷 251-256页

作者： LI zhen-xing LIN Hong CAO Li-min JAMEEL Khalid Seafood Safety Laboratory Ocean University of China Qingdao 266003 China Pakistan Council for Scientific and Industrial Research Laboratories Complex Karachi R-604 Pakistan

The tropomyosin fraction of shrimp proteins is potentially responsible for allergic reaction in individuals with genetic predisposition to allergy. However, there are no efficient and safe methods to reduce its allergenicity. High intensity ultrasound is known to change the structure of proteins. This study is aimed at assessing high intensity ultmsound＇s effect on the allergenicity of shrimp allergen. Shrimp and purified shrimp allergen were treated with high intensity ultrasound for 30-180 min. Extracts of treated samples were analyzed by enzyme-linked immunosorbent assay （ELISA） with pool serum of shrimp allergy patients and polyclonal anti-allergen antibodies and by immunoblotting after polyacrylamide gel electrophoresis. Shrimp treated with high intensity ultrasound showed a decrease in allergenicity measured with ELISA. A linear relationship between the immune response induced by treated shrimp allergen and the applied treatment time was observed. The decrease in allergenicity was confirmed by immunoblot assays with shrimp allergic patients serum. Allergenicity of shrimp allergen extracted from treated shrimp was higher than that of purified shrimp allergen with the same treatment time. Gel-filtration HPLC was applied for analysis of shrimp allergen after treatment with high intensity ultrasound. Some fractions were appeared with increasing treatment time. The results suggested that high intensity ultrasound could be used to reduce the allergenicity of shrimp.

关键词： Shrimp Allergen Allergenicity High intensity ultrasound

Fabrication and microstructure of nanostructured Mg-3Ni-2MnO_(2) by ball milling in hydrogen atmosphere

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Transactions of Nonferrous Metals Society of China 2009年第S02期19卷 359-362页

作者： FANG Wen-bin FANG Wa SUN Hong-fei YU zhen-xing School of Materials Science and Engineering Harbin Institute of TechnologyHarbin 150001China

Nanostructured Mg-3Ni-2MnO_(2) was synthesized by ball milling elemental powders of Mg,Ni and MnO_(2) in hydrogen *** microstructures of the powder prepared at different milling time were analyzed by X-ray diffractometry(XRD), scanning electron microscopy(SEM)and high resolution electron microscopy(HREM).The milling time is the most key parameter impacting on the grain size and the microstructure of *** prolonging the milling time,particle size becomes smaller and *** after the ball milling time reaches about 20 h,reduction of grain size becomes *** the milling time is more than 50 h,nanocrystalline fully *** the milling time is more than 80 h,there are more amorphous phases in *** average particle diameter of material is about 1μm and the grain size is 10-30 nm.

关键词： nanocrystalline ball milling grain size amorphous phase

Resatorvid protects against hypoxic-ischemic brain damage in neonatal rats

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Neural Regeneration Research 2020年第7期15卷 1316-1325页

作者： Li-Jun Jiang zhen-xing Xu Ming-Fu Wu Gai-Qin Dong Li-Li Zhang Jun-Yan Gao Chen-Xi Feng xing Feng Department of Neonatology Children's Hospital of Soochow UniversitySuzhouJiangsu ProvinceChina Department of Neonatology Affiliated Hospital of Yangzhou UniversityYangzhouJiangsu ProvinceChina

Secondary brain damage caused by hyperactivation of autophagy and inflammatory responses in neurons plays an important role in hypoxic-ischemic brain damage(HIBD).Although previous studies have implicated Toll-like receptor 4(TLR4)and nuclear factor kappa-B(NF-κB)in the neuroinflammatory response elicited by brain injury,the role and mechanisms of the TLR4-mediated autophagy signaling pathway in neonatal HIBD are still *** hypothesized that this pathway can regulate brain damage by modulating neuron autophagy and neuroinflammation in neonatal rats with ***,we established a neonatal HIBD rat model using the Rice-Vannucci method,and injected 0.75,1.5,or 3 mg/kg of the TLR4 inhibitor resatorvid(TAK-242)30 minutes after hypoxic *** results indicate that administering TAK-242 to neonatal rats after HIBD could significantly reduce the infarct volume and the extent of cerebral edema,alleviate neuronal damage and neurobehavioral impairment,and decrease the expression levels of TLR4,phospho-NF-κB p65,Beclin-1,microtubule-associated protein l light chain 3,tumor necrosis factor-α,and interleukin-1βin the ***,TAK-242 appears to exert a neuroprotective effect after HIBD by inhibiting activation of autophagy and the release of inflammatory cytokines via inhibition of the TLR4/NF-κB signaling *** study was approved by the Laboratory Animal Ethics Committee of Affiliated Hospital of Yangzhou University,China(approval No.20180114-15)on January 14,2018.

关键词： autophagy hypoxic-ischemic brain damage neonatal hypoxic-ischemic brain damage neuroinflammation nuclear factor kappa-B resatorvid TAK-242 Toll-like receptor 4

HYDRODYNAMIC ANALYSIS AND SIMULATION OF A SWIMMING BIONIC ROBOT TUNA

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Journal of Hydrodynamics 2007年第4期19卷 412-420页

作者： CHEN Hong ZHU Chang-an YIN Xie-zhen xing Xiao-zheng CHENG Gang College of Mechatronics and Control Engineering Shenzhen University Shenzhen 518060 China School of Engineering Science University of Science and Technology of China Hefei 230027 China

A dynamic model for undulatory locomotion was proposed to study the swimming mechanism of a developed bionic robot tuna. On the basis of inviscid hydrodynamics and rigid-body dynamics, the momentum and propulsive force required for propelling the swimming robot tuna＇s flexible body was calculated. By solving the established dynamic equations and efficiency formula, the swimming velocity and propulsive efficiency of the bionic robot tuna were obtained. The relationship between the kinematic parameters of the robot tuna＇s body curve and the hydrodynamic performances was established and discussed after hydrodynamic simulations. The results presented in this article can be used to increase the swimming speed, propulsive thrust, and the efficiency of underwater vehicles effectively.

关键词： undulatory locomotion swimming propulsive force efficiency body curve hydrodynamic simulations

Weak decays of doubly heavy baryons:"decay constants"

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Chinese Physics C 2018年第12期42卷 9-18页

作者： Xiao-Hui nu Yue-Long Shen Wei Wang zhen-xing Zhao INPAC Shanghai Key Laboratory for Particle Physics and CosmologyMOE Key Laboratory for Particle PhysicsAstrophysics and CosmologySchool of Physics and AstronomyShanghai Jiao-Tong UniversityShanghai 200240China College of Information Science and Engineering Ocean University of ChinaQingdao 266100China

Inspired by the recent observation of the ∑c^＋c^＋ by the LHCb Collaboration, we explore the ＂decay constants＂ of doubly heavy baryons in the framework of QCD sum rules. With the ∑cc,∑bb, and Ωcc,Ωbc,Ωbb baryons interpolated by three-quark operators, we calculate the correlation functions using the operator product expansion and include the contributions from operators up to dimension six. On the hadron side, we consider both contributions from the lowest-lying states with J^P 1/2^＋ and from negative parity baryons with JP=1/2^-. We find that the results are stable and the contaminations from negative parity baryons are not severe. These results are ingredients for the QCD study of weak decays and other properties of doubly-heavy baryons.

关键词： doubly heavy baryons decay constant QCD sum rules

Mesomorphous structure change by tail chain number in ionic liquid crystalline complexes of linear polymer and amphiphiles

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Chinese Chemical Letters 2011年第11期22卷 1375-1378页

作者： Zhi Yu Cheng Bi Ye Ren Shu Ying He Xin xing Liu zhen Tong Research Institute of Materials Science South China University of Technology Guangzhou 510640 China

Three polymer-amphiphile complexes were prepared by combining poly（allylamine hydrochloride）（PAH） with the potassium salt of mono-,di-,and trisubstituted benzoic acid dendrons（4-octyloxybenzoic acid,3,5-dioctyloxybenzoic acid,and 3,4,5- trioctyloxybenzoic acid）.The solid structure and properties were monitored with FT-IR,XRD,TG,DSC,and polarized optical microscope（POM）.Difference in the tail chain number of the dendritic amphiphile induced two different mesomorphous structures： lamella for the mono-,disubstituted dendron containing complexes and hexagonal column for the trisubstituted dendron containing *** corresponded to the ionic thermotropic liquid crystal SmA andΦ_h phases,*** finding is significant for design of functional nanostructures based on the ionic complexation of polymers and amphiphiles.

关键词： Polymer-amphiphile complex Poly(allylamine hydrochloride) Dendritic amphiphile Ionic thermotropic liquid crystal