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Journal of Zhejiang University-Science C(Computers and Electronics) 2011年第4期12卷 323-329页

作者： zhen-guo ma feng YU Rui-feng GE Ze-ke WANG Department of Instrument Engineering Zhejiang University Hangzhou 310027 China

We present a novel method to implement the radix-2 fast Fourier transform (FFT) algorithm on field programmable gate arrays (FPGA).The FFT architecture exploits parallelism by having more pipelined units in the stages,and more parallel units within a *** has the noticeable advantages of high speed and more efficient resource utilization by employing four ganged butterfly engines (GBEs),and can be well matched to the placement of the resources on the *** adopt the decimation-infrequency (DIF) radix-2 FFT algorithm and implement the FFT processor on a state-of-the-art *** results show that the processor can compute 1024-point complex radix-2 FFT in about 11 μs with a clock frequency of 200 MHz.

关键词： Ganged butterfly engine (GBE) Radix-2 Fast Fourier transform (FFT) Field programmable gate array (FPGA)

Lactobacilli inhibit interleukin-8 production induced by Helicobacter pylori lipopolysaccharide-activated Toll-like receptor 4

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World Journal of Gastroenterology 2008年第32期14卷 5090-5095页

作者： Chao Zhou feng-zhen ma Xue-Jie Deng Hong Yuan Hong-Sheng ma Department of Gastroenterology West China Hospital of Sichuan University Chengdu 610041 Sichuan Province China

AIM： To investigate the effect of Lactobacillus bulgaricus （LBG） on the Toll-like receptor 4 （TLR4） pathway and interleukin-8 （IL-8） production in SGC-7901 cells treated with Helicobacter pyloriSydney strain 1 lipopolysaccharide （HpyloriSS1-LPS）. METHODS： SGC-7901 cells were treated with HpyloriSS1-LPS in the presence or absence of pretreatment for 1 h with viable LBG or supernatant recovered from LBG culture MRS broth （LBG-s）. Cellular lysates were prepared for Western blot with anti-TLR4, anti-transforming growth factor β-activated kinase 1 （TAK1）, anti-phospho-TAK1, anti-nuclear factor κB （NF-κB）, anti-p38 mitogen-activated protein kinase （p38maPK）, and anti-phospho-p38maPK antibodies. The amount of IL-8 in cell culture medium was measured by ELISA. RESULTS： H pyloriSS1-LPS up-regulated the expression of TLR4, stimulated the phosphorylation of TAKI, subsequently enhanced the activation of NF- κB and the phosphorylation of p38maPK in a time- dependent manner, leading to augmentation of IL-8 production in SGC-7901 cells. Viable LBG or LBG-s pretreatment attenuated the expression of TLR4, inhibited the phosphorylation of TAK1 and p38maPK, prevented the activation of NF-κB, and consequently blocked IL-8 ***： H py/oriSS1-LPS induces IL-8 production through activating TLR4 signaling in SGC-7901 cells and viable LBG or LBG-s prevents H pyloriSS1-LPS-mediated IL-8 production via inhibition of the TLR4 pathway.

关键词： Lactobacillus Helicobacter pylori Lipopoly-saccharide Toll-like receptor 4, Interleukin-8

Microstructural evolution and mechanical properties of aging high nitrogen austenitic stainless steels

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International Journal of Minerals,Metallurgy and materials 2010年第6期17卷 729-736页

作者： Zhou-hua Jiang Zu-rui Zhang Hua-bing Li zhen Li Qi-feng ma School of materials and Metallurgy Northeastern University Shenyang 110819 China

The microstructural evolution of 18Crl 8Mn2Mo0.77N high nitrogen austenitic stainless steel in aging treatment was investigated by optical microscopy （OM）, scanning electron microscopy （SEM）, and transmission electron microscopy （TEM）. The results show that hexagonal intergranular and cellular Cr2N with a=0.478 nm and c=0.444 nm and body-centered cubic intermetaUic X phase with a=0.892 nm precipitate gradually in the isothermal aging treatment. The matrix nitrogen depletion due to the intergranular Cr2N precipitation induces the decay of Vickers hardness, and the formation of cellular Cr2N and X phase causes the increase in the values. The impact toughness presents a monotonic decrease and SEM morphologies show the leading brittle intergranular fracture. The tensile strength and elongation deteriorate obviously except for the sample aged for 1 h in yield strength. Stress concentration occurs when the matrix dislocations pile up at the pre- cipitation and matrix interfaces, and the interracial dislocations may become precursors to the misfit dislocations, which can form small cleavage steps and accelerate the formation of cracks.

关键词： microstructural evolution aging mechanical properties austenitic stainless steel secondary phase

Preparation and performance evaluation of the slickwater using novel polymeric drag reducing agent with high temperature and shear resistance ability

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Petroleum Science 2024年第2期21卷 1113-1121页

作者： Ming-Wei Zhao zhen-feng ma Cai-Li Dai WeiWu Yong-Quan Sun Xu-Guang Song Yun-Long Cheng Xiang-Yu Wang National Key Laboratory of Deep Oil and Gas China University of Petroleum(East China)Qingdao266580ShandongChina Shandong Key Laboratory of Oilfield Chemistry China University of Petroleum(East China)Qingdao266580ShandongChina Sinopec Shengli Oilfield Dongying257001ShandongChina Department of Chemical and materials Engineering University of AlbertaEdmontonAB T6G 1H9Canada East China Petroleum Bureau of Sinopec Nanjing210011JiangsuChina

Slickwater fracturing fluids are widely used in the development of unconventional oil and gas resources due to the advantages of low cost,low formation damage and high drag reduction ***,their performance is severely affected at high *** reducing agent is the key to determine the drag reducing performance of *** this work,in order to further improve the temperature resistance of slickwater,a temperature-resistant polymeric drag reducing agent(PDRA)was synthesized and used as the basis for preparing the temperature-resistant *** slickwater system was prepared with the compositions of 0.2 wt%PDRA,0.05 wt%drainage aid nonylphenol polyoxyethylene ether phosphate(NPEP)and 0.5 wt%anti-expansion agent polyepichlorohydrindimethylamine(PDM).The drag reduction ability,rheology properties,temperature and shear resistance ability,and core damage property of slickwater were systematically studied and *** contrast to on-site drag reducing agent(DRA)and HPAM,the temperature-resistant slickwater demonstrates enhanced drag reduction efficacy at 90℃,exhibiting superior temperature and shear resistance ***,the drag reduction retention rate for the slickwater achieved an impressive 90.52%after a 30-min shearing ***,the core damage is only 5.53%.We expect that this study can broaden the application of slickwater in high-temperature reservoirs and provide a theoretical basis for field applications.

关键词： Unconventional resources Polymeric drag reducing agent Slickwater High drag reduction rate Temperature resistance

Intermolecular interactions induced property improvement for clean fracturing fluid by deep eutectic solvents

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Petroleum Science 2023年第6期20卷 3540-3552页

作者： Xiang-Yu Wang Ming-Wei Zhao Xu-Hao Wang Peng Liu Meng-Yao Fan Teng Li zhen-feng ma Ying-Jie Dai Cai-Li Dai Key Laboratory of Unconventional Oil&Gas Development China University of PetroleumQingdao266580ShandongPR China Shandong Key Laboratory of Oilfield Chemistry China University of PetroleumQingdao266580ShandongPR China Dongxin Oil Production Plant Ying First management Zone of Sinopec Shengli Oilfield Company Dongying257002ShandongPR China

Fracturing fluid property play a critical role in developing unconventional *** eutectic solvents(DESs)show fascinating potential for property improvement of clean fracturing fluids(CFFs)due to their low-price,low-toxicity,chemical stability and flexible *** this work,DESs were synthesized by mixing hydrogen bond acceptors(HBAs)and a given hydrogen bond donor(HBD)to explore their underlying influence on CFF properties based on the intermolecular *** hydrogen-bonding,van der Waals and electrostatic interactions between DES components and surfactants improved the CFF properties by promoting the arrangement of surfactants at interface and enhancing the micelle network *** HBD enhanced the resistance of CFF for Ca^(2+) due to coordination-bonding *** DESs composed of choline chloride(ChCl)and malonic acid show great enhancement for surface,rheology,temperature resistance,salt tolerance,drag reduction,and gel-breaking performance of *** DESs also improved the gel-breaking CFF-oil interactions,increasing the imbibition efficiencies to 44.2%in 74 *** HBAs can effectively strengthen the intermolecular interactions(e.g.,HBA-surfactant and HBD-surfactant interactions)to improve CFF *** DESs developed in this study provide a novel strategy to intensify CFF properties.

关键词： Deep eutectic solvents(DESs) Clean fracturing fluids(CFFs) Intermolecular interactions Property improvement

Local magnetic moment oscillation around an Anderson impurity on graphene

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Science China(Physics,Mechanics & Astronomy) 2025年第1期Mechanics & Astronomy) .卷 192-201页

作者： Shuai Li zhen ma Jin-Hua Gao School of Science Hebei University of Science and Technology School of Electronics and Information Zhengzhou University of Light Industry School of Physics and Wuhan National High magnetic Field Center Huazhong University of Science and Technology

We theoretically investigate the spin resolved Friedel oscillation （FO） and quasiparticle interference （QPI） in graphene induced by an Anderson *** the impurity becomes magnetic,the resulted FO becomes spin dependent,which gives rise to a local magnetic moment oscillation with an envelop decaying as r-2in real space in the doping ***,at half filling,the electron density and local magnetic moment will not oscillate but decay as *** spin resolved FO has both sublattice and spin ***,the local magnetic moment decay at half filling only occurs at one sublattice of graphene,which is quite like the phenomenon observed in the STM experiment (***ález-Herrero et al.,Science 352,437 （2016）).We further give an analytic formula about such spin dependent FO based on the stationary phase ***,we study the interference of quasiparticles around the magnetic impurity by calculating the spin dependent Fourier-transformed local density of states （FT-LDOS）.Our work gives a comprehensive understanding about the local magnetic moment oscillation around an Anderson impurity on graphene.

关键词： Friedel oscillation local magnetic moment graphene Anderson impurity

Mechanism of retinoid receptors in inhibiting proliferation and inducing apoptosis of human melanoma cell line A375

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Chinese Medical Journal 2005年第17期118卷 1482-1486页

作者： NIU Xin-wu PENG zhen-hui feng Jie ma Hui-qun LIU Chao YUAN Jing-yi Department of Dermatology Second Hospital of Xi＇an Jiaotong University Xi＇an 71004 China

malignant melanoma is a common cancer of skin. Its incidence is growing rapidly in recent years, however, there is no effective therapy for this cancer. Retinoids are metabolites or derivatives of vitamin A. They are essential for growth, differentiation, and maintenance of epithelial tissues. Previous studies showed that retinoids could inhibit growth of many kinds of malignant tumor cell lines and induce its apoptosis, including malignant melanoma cell lines. Some retinoids have therapeutic action to malignant melanoma, such as all-trans retinoic acid （ATRA） and 13-cis-RA. Retinoids take effects mainly through two kinds of nuclear receptors, retinoic acid receptor （RAR） and retinoic acid X receptor （RXR）. In this study, we have investigated the effects of diverse retinoids and receptor agonists in inhibiting proliferation and inducing apoptosis of human melanoma cell line A375.

关键词： retinoids receptors apoptosis proliferation

Tuberculous peritonitis complicated by an intraperitoneal tuberculous abscess: A case report

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World Journal of Clinical Cases 2024年第27期12卷 6117-6123页

作者： Wei-Peng Liu feng-zhen ma Zhou Zhao Zong-Rui Li Bao-Guang Hu Tao Yang Department of Gastrointestinal Surgery Binzhou Medical University HospitalBinzhou 256603Shandong ProvinceChina Department of Gastroenterology Binzhou Medical University HospitalBinzhou 256603Shandong ProvinceChina

BACKGROUND Tuberculous peritonitis(TBP)is a chronic,diffuse inflammation of the peritoneum caused by Mycobacterium *** route of infection can be by direct spread of intraperitoneal tuberculosis(TB)or by hematogenous *** former is more common,such as intestinal TB,mesenteric lymphatic TB,fa-llopian tube TB,etc.,and can be the direct primary lesion of the *** SUMmaRY We present an older male patient with TBP complicated by an abdominal *** patient's preoperative symptoms,signs and imaging data suggested a poss-ible abdominal *** surgical treatment,the patient's primary diagnosis of TBP complicating an intraperitoneal tuberculous abscess was established by com-bining past medical history,postoperative pathology,and positive results of TB-related laboratory *** patient's symptoms were significantly reduced after surgical treatment,and he was discharged from the hospital with instructions to continue treatment at a TB specialist hospital and to undergo anti-TB treatment if *** This case report analyses the management of TBP complicated by intraperitoneal tuberculous abscess and highlights the importance of early definitive diagnosis in the hope of improving the clinical management of this type of disease.

关键词： Abdominal mass Tuberculous peritonitis Intraperitoneal tuberculous abscess Surgical treatment Case report

Mechanism of retinoid receptors in inhibiting proliferation and inducing apoptosis of human melanoma cell line A375

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中华医学杂志(英文版) 2005年第17期 76-80页

作者： NIU Xin-wu, PENG zhen-hui, feng Jie, ma Hui-qun, LIU Chao and YUAN Jing-yi Department of Dermatology, Second Hospital of Xi’an Jiaotong University, Xi’an 71004, China

Integration of Electrical Properties and Polarization Loss Modulation on Atomic Fe–N‑RGO for Boosting Electromagnetic Wave Absorption

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Nano-Micro Letters 2025年第2期17卷 517-532页

作者： Kaili Zhang Yuefeng Yan zhen Wang Guansheng ma Dechang Jia Xiaoxiao Huang Yu Zhou State Key Laboratory of Precision Welding&Joining of materials and Structures Harbin Institute of TechnologyHarbin 150001People’s Republic of China School of materials Science and Engineering Harbin Institute of TechnologyHarbin 150001People’s Republic of China MIIT Key Laboratory of Advanced Structural‑Functional Integration materials&Green manufacturing Technology Harbin Institute of TechnologyHarbin 150001People’s Republic of China

Developing effective strategies to regulate graphene’s conduction loss and polarization has become a key to expanding its application in the electromagnetic wave absorption(EMWA)*** on the unique energy band structure of graphene,regulating its bandgap and electrical properties by introducing heteroatoms is considered a feasible ***,metal-nitrogen doping reduced graphene oxide(M–N-RGO)was prepared by embedding a series of single metal atoms M–N_(4) sites(M=Mn,Fe,Co,Ni,Cu,Zn,Nb,Cd,and Sn)in RGO using an N-coordination atom-assisted *** composites had adjustable conductivity and polarization to optimize dielectric loss and impedance matching for efficient EMWA *** results showed that the minimum reflection loss(RL_(min))of Fe–N-RGO reaches−74.05 dB(2.0 mm)and the maximum effective absorption bandwidth(EAB_(max))is 7.05 GHz(1.89 mm)even with a low filler loading of only 1 wt%.Combined with X-ray absorption spectra(XAFS),atomic force microscopy,and density functional theory calculation analysis,the Fe–N_(4) can be used as the polarization center to increase dipole polarization,interface polarization and defect-induced polarization due to d-p orbital hybridization and structural ***,electron migration within the Fe further leads to conduction loss,thereby synergistically promoting energy *** study demonstrates the effectiveness of metal-nitrogen doping in regulating the graphene′s dielectric properties,which provides an important basis for further investigation of the loss mechanism.

关键词： Electromagnetic wave absorption Fe-N-RGO Dipole polarization Conduction loss Impedance matching