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Formation of Carbon Nitride Films by Nitrogen Ion Bombardment on C_(60) Films

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Chinese Physics Letters 1996年第9期13卷 714-717页

作者： REN Zhong-min DU Yuan-cheng YING Zhi-feng LI fu-ming LIN Jing REN Yun-Zhu zong xiang-fu Department of Physics Fudan UniversityState Key Joint Laboratory for Materials Modification by LaserIonand Electron BeamsShanghai 200433 Institute of Materials Science Fudan UniversityShanghai 200433

The synthesis of covalent carbon nitride films becomes an important subject in the materials research *** a new synthetic method two low-energy(400 and 1000eV)nitrogen ion beams are used to bombard on C_(60) thin films *** bombarded films are used for Raman and x-ray photoelectron spectroscopy(XPS)*** results of the analyses show that under the bombardment of 400eV nitrogen ion beam,the film still contains a large amount of undestructed C_(60) *** the case of l000eV bombardment,only a little amount of C_(60) molecules is kept *** experimental results also show that the destructed carbon species will combine chemically with nitrogen ions to form stable covalent carbon nitride,confirmed by the Raman peaks of,e.g.,*** XPS Nls and Cls lines also indicate the formation of covalent carbon nitride in the bombarded films.

关键词： field carbon chemically

Ion-Beam Bombarding Effects on Deposition of Carbon Nitride Films by Laser Ablation

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Chinese Physics Letters 1996年第11期13卷 878-880页

作者： YING Zhi-feng REN Zhong-min DU Yuan-cheng LI fu-ming LIN Jing REN Yun-zhu zong xiang-fu Department of Physics and State Key Lab oratory for Materials Modification by LaserIon and Electron beamsFudan UniversityShanghai 200433 Institute of Materials Science Fudan UniversityShanghai 200433

In order to obtain high quality carbon nitride films,x-ray photoelectron spectroscopy and Raman spectrum were used to analyze several kinds of film:(a)laser-ablated amorphous carbon(a-C)films,(b)a-C films after a 1 keV nitrbgen ion beam bombardment.(c)carbon nitride(CN_(x))films synthesized by ablation assisted with ion beam bombardment,(d)CN_(x) films after a 50eV nitrogen ion beam bombardment,and(e)CN_(x) films after a 1 keV nitrogen ion beam *** comparison among these films showed that the concurrent deposition of CN_(x) films by ablation and a nitrogen ion beam should be better than the post-treatment of a-C films by nitrogen ion beam *** the case of concurrent deposited CN_(x) films,a post-treatment by a nitrogen ion beam bombardment with an appropriate energy(possibly less than 1 keV)was proposed to improve the ratio of C-N binding structures in the deposited films.

关键词： beam films amorphous

Microstructure Study of Photoluminescent Porous Silicon

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Chinese Physics Letters 1996年第1期13卷 35-38页

作者： WENG Yu-min zong xiang-fu Materials Science Institute Fudan UniversityShanghai 200433

We have studied the microstructure and photoluminescent properties of porous *** resolution observations revealed that the microstructure of porous Si consists with nano-crystaliites Si embedded in the surrounding amorphous *** struc-ture of nano-crystallites of porous Si is not consis tent with the usual diamond struc-ture of bulk *** photoluminescence from porous Si is due to the quantum com finement of carriers in this structure.

关键词： porous struc microstructure

In Situ Rutherford Backscattering Spectrometry Analysis of Films by Combination with Sputter Etching

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Chinese Physics Letters 1999年第10期16卷 770-772页

作者： JIANG Lei LIU Bo ZHOU Zhu-ying HE Mian-hong ZHAO Guo-qing zong xiang-fu Accelerator-based Atomic and Nuclear Physics Laboratory Institute of Modem PhysicsFudan UniversityShanghai 200433 National Micro-analysis Center for Microelectronic Materials and Devices Department of Material ScienceFudan UniversityShanghai 200433

We have set up an experimental system consisting of an im gun and a Rutherford backscattering spectro-metry(RBS)analysis *** this system,in situ 2MeV*He+RBS analysis of films is carried out by combination with sputter etching cf low energy Ar+*** an example of the sputtering/RBS method,the analysis of three samples,i.e.,Si/(GexSi_(1-x)/Si)/Si(100),WSi_(x)/SiO_(2)/Si and CoSi_(x)/Si,is presented in this *** an appropriate fraction of the thick layer is removed by sputtering,the back edge of the Ge peak is separated from Si RBS spectmm on the interface and the O peak of the buried S1O2 layer can be *** change cf the doped Ti and W concentrations related to Co on the top surface is *** advantages of this analytical method and its possible applications in film are discussed.

关键词： system removed separated

Thermal Stress Analysis of Floating-Gate Tunneling Oxide Electrically Erasable Programmable Read Only Memory During Manufacturing Process

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Chinese Physics Letters 1998年第10期15卷 767-769页

作者： zong xiang-fu WANG Xu WENG Yu-min YAN Ren-jin TANG Guo-an ZHANG Zhao-qiang Institute of Materials Science Fudan UniversityShanghai 200433 Department of Mechanics Fudan UniversityShanghai 200433

In this study,finite element modeling was used to evaluate the residual thermal stress in floating-gate tunneling oxide electrically erasable programmable read only memory(FLOTOX E2PROMs)manufacturing *** attention is paid to the tunnel oxide region,in which high field electron injection is the basis to E2PROMs *** results show the presence of large stresses and stress gradients at the fringe:This may contribute to the invalidation of E2PROMs.A possible failure mechanism of E2PROM related to residual thermal stress-induced leakage is proposed.

关键词： E2PROM stress floating

Effect of Al content in molten steel on interaction between MgO-C refractory and SPHC steel

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Journal of Iron and Steel Research International 2024年第4期31卷 838-848页

作者： fu-bin Gao fu-ming Wang xiang Zhang Tian-yu Du Xin-hua Wangg School of Metallurgical and Ecological Engineering University of Science and Technology BeijingBeijing 100083China Handan Iron and Steel Company Hegang GroupHandan 056015HebeiChina The State Key Laboratory of Refractories and Metallurgy Wuhan University of Science and TechnologyWuhan 430081HubeiChina

The effect of Al content in molten steel on the interaction between SPHC steel(0.005-0.068 wt.%Al,and 19×10^(-4)-58×10^(-4)wt.%O)and MgO-C refractory(11.63 wt.%C)was ***-metallic inclusions in the steel were examined at various periods(0,5,15,30,45,and 60 min)as well as the MgO-C interface after 60 min of corrosion at 1600℃.The results show that when MgO-C refractory comes into contact with SPHC steel,the refractory interface consists of three layers arranged from the innermost to the outermost,including the original refractory layer,the dense MgO layer,and the iron infiltration *** carbon in the MgO-C refractories and the Al content in the molten steel undergo a reaction with the MgO in the refractories,resulting in an increase in Mg concentration in the *** Al content in the molten steel from 0.005 to 0.068 wt.%causes a spinel layer to appear at the interface,and the disappearance time of Al_(2)O_(3) inclusions in the steel decreases from 60 to 30 min,while the average MgO content in inclusions ***,controlling the Al content in the molten steel and the smelting duration can help regulate the formation of spinel inclusionsinthe steel.

关键词： MgO-C refractory SPHC steel Inclusion-Spinel Al-killed steel Interfacial reaction

Phospholipase A2 enzymes PLA2G2A and PLA2G12B as potential diagnostic and prognostic biomarkers in cholangiocarcinoma

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World Journal of Gastrointestinal Surgery 2024年第2期16卷 289-306页

作者： Chen Qiu Yu-Kai xiang Xuan-Bo Da Hong-Lei Zhang xiang-Yu Kong Nian-zong Hou Cheng Zhang fu-Zhou Tian Yu-Long Yang Center of Gallbladder Disease Shanghai East HospitalInstitute of Gallstone DiseaseSchool of MedicineTongji UniversityShanghai 200092China General Surgery Center Chengdu Military General HospitalChengdu 610083Sichuan ProvinceChina

BACKGROUND Phospholipase A2(PLA2)enzymes are pivotal in various biological processes,such as lipid mediator production,membrane remodeling,bioenergetics,and maintaining the body surface ***,these enzymes play a significant role in the development of diverse *** To systematically and comprehensively explore the expression of the PLA2 family genes and their potential implications in cholangiocarcinoma(CCA).METHODS We conducted an analysis of five CCA datasets from The Cancer Genome Atlas and the Gene Expression *** study identified differentially expressed genes between tumor tissues and adjacent normal tissues,with a focus on PLA2G2A and *** Set Enrichment Analysis was utilized to pinpoint associated ***,relevant hub genes and microRNAs for PLA2G2A and PLA2G12B were predicted,and their correlation with the prognosis of CCA was *** PLA2G2A and PLA2G12B were discerned as differentially expressed in CCA,manifesting significant variations in expression levels in urine and serum between CCA patients and healthy *** expression of PLA2G2A was correlated with poorer overall survival in CCA ***,the study delineated pathways and miRNAs associated with these *** Our findings suggest that PLA2G2A and PLA2G12B may serve as novel potential diagnostic and prognostic markers for *** increased levels of these genes in biological fluids could be employed as non-invasive markers for CCA,and their expression levels are indicative of prognosis,underscoring their potential utility in clinical settings.

关键词： PLA2G2A PLA2G12B Diagnostic Prognostic biomarkers cholangiocarcinoma

Learning a Mixture of Conditional Gating Blocks for Visual Question Answering

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Journal of Computer Science & Technology 2024年第4期39卷 912-928页

作者： Qiang Sun Yan-Wei fu xiang-Yang Xue School of Statistics and Information Shanghai University of International Business and EconomicsShanghai 201620China Academy for Engineering and Technology Fudan UniversityShanghai 200433China School of Data Science Fudan UniversityShanghai 200433China School of Computer Science Fudan UniversityShanghai 200433China

As a Turing test in multimedia,visual question answering(VQA)aims to answer the textual question with a given ***,the“dynamic”property of neural networks has been explored as one of the most promising ways of improving the adaptability,interpretability,and capacity of the neural network ***,despite the prevalence of dynamic convolutional neural networks,it is relatively less touched and very nontrivial to exploit dynamics in the transformers of the VQA tasks through all the stages in an end-to-end ***,due to the large computation cost of transformers,researchers are inclined to only apply transformers on the extracted high-level visual features for downstream vision and language *** this end,we introduce a question-guided dynamic layer to the transformer as it can effectively increase the model capacity and require fewer transformer layers for the VQA *** particular,we name the dynamics in the Transformer as Conditional Multi-Head Self-Attention block(cMHSA).furthermore,our questionguided cMHSA is compatible with conditional ResNeXt block(cResNeXt).Thus a novel model mixture of conditional gating blocks(McG)is proposed for VQA,which keeps the best of the Transformer,convolutional neural network(CNN),and dynamic *** pure conditional gating CNN model and the conditional gating Transformer model can be viewed as special examples of *** quantitatively and qualitatively evaluate McG on the CLEVR and VQA-Abstract *** experiments show that McG has achieved the state-of-the-art performance on these benchmark datasets.

关键词： visual question answering Transformer dynamic network

Degradation behaviors of Nabumetone and its metabolite during UV/monochloramine process:Experimental and theoretical study

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Journal of Environmental Sciences 2024年第8期142卷 103-114页

作者： xiang Tu Yunsong Bai Qing fu Sheng Chang Kunfeng Zhang Yang Pan Ruiyang Xiao Yifu fu Qi Zhang State Key Laboratory of Environmental Criteria and Risk Assessment State Environmental Protection Key Laboratory of Drinking Water Source ProtectionResearch Centre of Lake EnvironmentNational Engineering Laboratory for Lake Pollution Control and Ecological RestorationChinese Research Academy of Environmental SciencesBeijing 100012China School of Environmental Science and Engineering Suzhou University of Science and TechnologySuzhou 215009China Institute of Environmental Engineering School of Metallurgy and EnvironmentCentral South UniversityChangsha 410083China School of Forestry Northeast Forestry UniversityHarbin 150040China

This study investigated degradation behaviors of a nonsteroidal anti-inflammatory drug Nabumetone(NMT)and its major metabolite 6-methoxy-2-naphthylacetic acid(MNA)in the coupling process of ultraviolet and monochloramine(UV/NH2Cl).The second-order rate constants of the contaminants reacting with reactive radicals(HO·,Cl·,Cl_(2)·-,and CO_(3)·^(-))were determined by laser flash photolysis ***·and Cl·contributed predominantly with 52.3%and 21.7%for NMT degradation and 60.8%and 22.3%for MNA *** presence of chlorides retarded the degradation of NMT,while promoted the destruction of MNA,which was ascribed to the photosensitization effects of MNA under UV *** functional theory(DFT)calculations revealed that radical adduct formation(RAF)was dominant pathway for both HO·and Cl·reacting with the contaminants,and hydrogen atom transfer(HAT)preferred to occur on side chains of NMT and *** reacted with NO_(2)·through single electron transfer(SET)with the second-order rate constant calculated to be 5.35×10^(7)(mol/L)^(-1)sec^(-1),and the contribution of NO_(2)·was predicted to be 13.0%of the total rate constant of NMT in pure water,which indicated that NO_(2)·played a nonnegligible role in the degradation of *** acute toxicity and developmental toxicity of NMT were enhanced after UV/NH_(2)Cl treatment,while those of MNA were *** transformation products of both NMT and MNA exhibited higher mutagenicity than their parent *** study provides a deep understanding of the mechanism of radical degradation of NMT and MNA in the treatment of UV/NH2Cl.

关键词： UV/NH_(2)Cl Reactive species Degradation kinetics Reaction mechanism Degradation products