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Investigation of oxy-fuel combustion for methane and acid gas in a diffusion flame

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Chinese Journal of Chemical Engineering 2024年第1期65卷 106-116页

作者： Songling Guo Xun Tao fan zhou Mengyan Yu Yufan Wu Yunfei Gao Lu Ding Fuchen Wang Institute of Clean Coal Technology East China University of Science and TechnologyShanghai 200237China

Co-combustion of methane(CH4)and acid gas(AG)is required to sustain the temperature in Claus reaction *** this study,oxy-fuel combustion of methane and acid gas has been experimentally studied in a diffusion *** equivalence ratios(ER=1.0,1.5,2.0)and CH_(4)-addition ratios(CH_(4)/AG=0.3,0.5,0.7)were examined and the flame was interpreted by analyzing the distributions of the temperature and species concentration along central ***_(4)-AG diffusion flame could be classified into three sections namely initial reaction,oxidation and complex reaction *** oxidation of CH_(4)and H_(2)S was noted in the first section wherein H_(2)S was preferred and both were mainly proceeding decomposition and partial ***_(2)was formed at oxidation section together with obvious presence of H2 and ***,H2 and CO were inclined to be sustained under fuel rich condition in the complex reaction *** ER and increasing CH4/AG contributed to higher temperature,H_(2)S and CH_(4)oxidation and CO_(2)*** a growing trend for CH_(4)and AG to convert into H_(2),CO and SO_(2)could be *** this factor enhanced the generation of CS2 and COS in the flame inner core by interactions of CH4 and CO_(2)with sulfur *** was formed through the interactions of CO and CO_(2)with sulfur *** CS_(2)production directly relied on reaction of CH_(4)with sulfur *** concentration of COS was greater than CS_(2)since CS_(2)was probably inhibited due to the presence of H_(2).COS and CS_(2)could be consumed by further oxidation or other complex reactions.

关键词： Acid gas Methane Oxy-fuel combustion Oxidation Chemical analysis Carbon sulfides

Green Synthesis of Iron(Ⅱ,Ⅲ)-polyphenol Nanoparticles and Their Adsorption of Malachite Green

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Journal of Wuhan University of Technology(Materials Science) 2024年第4期39卷 1025-1030页

作者：胡玉 zhou fan ZHANG Nan PAN Xiaobin LI Shiying ZHANG Dong LI Li 张玲帆 Department of Chemistry and Environmental Engineering Hanjiang Normal UniversityShiyan 442000China Shiyan Hydrological and Water Resources Survey Bureau of Hubei Province Shiyan 442000China School of Chemistry and Molecular Engineering East China University of Science and TechnologyShanghai 200237China

Three kinds of iron nanoparticles(FeNPs)were prepared via green route based on pomegranate(PG),green tea(GT),and mulberry(ML)extracts under ambient *** obtained materials were characterized by scanning electron microscopy(SEM),transmission electronic microscopy(TEM),X-ray energy-dispersive spectrometer(EDS),X-ray diffraction(XRD),fourier transform infrared spectroscopy(FTIR),and X-ray photoelectron spectroscopy(XPS)*** experimental results show that FeNPs were in the form of amorphous iron(Ⅱ,Ⅲ)-polyphenol complex with different dispersity and ***-Fe has the smallest size range of 25-35 nm,PG-Fe has a moderate size-distribution of 30-40 nm,while ML-Fe formed a tuberous net-type with a sheeting ***-Fe displays the highest removal efficiency of 90.2%in 20 min towards cationic dye of malachite green(16.6%by ML-Fe and 69.3%by GT-Fe),which is attributed to its highest polyphenol content,lowest zeta potential,as well as the most Fe^(2+)on the surface of *** removal mechanism was mainly induced by electrostatic adsorption based on pH and zeta potential tests.

关键词： iron nanoparticles pomegranate green tea mulberry adsorption

Cardiac infiltration of diffuse large B-cell lymphoma manifesting as sustained ventricular tachycardia:a case report

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Journal of Geriatric Cardiology 2024年第2期21卷 242-245页

作者： Wei CHEN Kun HUANG Wei-Wei GUO fan zhou De-Ning LIAO Department of Cardiology Shanghai Jingan District Zhabei Central HospitalShanghaiChina Department of Cardiology Shanghai Changzheng HospitalShanghaiChina Department of Hematology Shanghai Jingan District Zhabei Central HospitalShanghaiChina

Cardiac tumors are ***,cardiac metastases can occur in up to 10%of patients with *** cardiac neoplasms,metastases are much more common than primary cardiac tumors.[1]Metastatic cardiac neoplasms most frequently metast... 详细信息

关键词： neoplasms sustained cardiac

Binary Program Vulnerability Mining Based on Neural Network

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Computers, Materials & Continua 2024年第2期78卷 1861-1879页

作者： Zhenhui Li Shuangping Xing Lin Yu Huiping Li fan zhou Guangqiang Yin Xikai Tang Zhiguo Wang School of Information and Software Engineering University of Electronic Science and Technology of ChinaChengdu611731China School of Electrical and Computer Engineering University ofWaterlooWaterlooN2L 3G1Canada

Software security analysts typically only have access to the executable program and cannot directly access the source code of the *** poses significant challenges to security *** it is crucial to identify vulnerabilities in such non-source code programs,there exists a limited set of generalized tools due to the low versatility of current vulnerability mining ***,these tools suffer from some *** terms of targeted fuzzing,the path searching for target points is not streamlined enough,and the completely random testing leads to an excessively large search ***,when it comes to code similarity analysis,there are issues with incomplete code feature extraction,which may result in information *** this paper,we propose a cross-platform and cross-architecture approach to exploit vulnerabilities using neural network obfuscation *** leveraging the Angr framework,a deobfuscation technique is introduced,along with the adoption of a VEX-IR-based intermediate language conversion *** combination allows for the unified handling of binary programs across various architectures,compilers,and compilation ***,binary programs are processed to extract multi-level spatial features using a combination of a skip-gram model with self-attention mechanism and a bidirectional Long Short-Term Memory(LSTM)***,the graph embedding network is utilized to evaluate the similarity of program *** on these similarity scores,a target function is determined,and symbolic execution is applied to solve the target *** solved content serves as the initial seed for targeted *** binary program is processed by using the de-obfuscation technique and intermediate language transformation method,and then the similarity of program functions is evaluated by using a graph embedding network,and symbolic execution is performed based on these similarity *** approach facilitates

关键词： Vulnerability mining de-obfuscation neural network graph embedding network symbolic execution

A Pricing Model of Airbag Options with Discrete Monitoring

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Acta Mathematicae Applicatae Sinica 2024年

作者： Min HU Shui-yi HU Cong QIN fan zhou Center for Financial Engineering Soochow UniversitySuzhou College of Liberal Arts and Sciences University of Connecticut

In this paper, we propose a pricing model of airbag options with discrete monitoring, time-varying barriers, early exercise opportunities, and other popular features simultaneously. We show that the option value is a viscosity solution of a PDE system. In particular, a closed-form solution is obtained in the classic BlackScholes economy with no early exercise opportunities. For the general case, we develop a numerical algorithm and conduct an extensive numerical analysis after calibrating the model to the CSI 500 index in China. Greek letters, dynamic hedging, and assessment of investing in airbag options are also studied.

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计及多元不确定性的综合能源系统优化配置

控制理论与应用 2024年第3期41卷 533-542页

作者：周帆陈龙赵珺王伟工业装备智能控制与优化教育部重点实验室(大连理工大学) 辽宁大连116024 大连理工大学控制科学与工程学院辽宁大连116024

综合能源系统的优化配置关键在于设备选型与数量配置,而能源负荷负荷和可再生能源出力预测误差以及故障发生的不确定性将直接影响配置方案的合理性以及经济性.为此,本文提出一种考虑源–网–荷多元不确定性的综合能源系统多目标–机会... 详细信息

综合能源系统的优化配置关键在于设备选型与数量配置,而能源负荷负荷和可再生能源出力预测误差以及故障发生的不确定性将直接影响配置方案的合理性以及经济性.为此,本文提出一种考虑源–网–荷多元不确定性的综合能源系统多目标–机会约束规划方法.考虑可再生能源出力与负荷需求预测误差引起的不确定性,本文构建了满足置信概率的能量供需平衡约束;针对供能网络中设备N-1故障引起的不确定性,提出调整裕度模型,进而构建了调整裕度与N-1设备能量缺额的机会约束.对于获得的帕累托解集,采用信息熵与逼近理想排序法构建多准则评价模型,以确定最优的系统配置.将本文方法应用于某区域综合能源系统的最优结构设计,实验结果表明,本文方法的有效性与可靠性.

关键词：综合能源系统不确定性 N-1故障机会约束多准则评价

云贵高原一座典型高原水库浮游植物群落演替特征及其与环境因子的关系

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湖泊科学 2024年第3期36卷 695-707页

作者：周帆陈晨徐韬杨阳贵州师范大学生命科学学院贵阳550025 贵州师范大学应急管理学院贵阳550025

浮游植物是水体的初级生产者,可以指示环境变化。高原水库由于其蒸发量大、雨季短、旱季长、抗污染能力差的特点,生态系统脆弱,其浮游植物群落的变化对环境条件更为敏感。为了解云贵高原地区乌江渡水库浮游植物的群落结构和演替特征,于2... 详细信息

浮游植物是水体的初级生产者,可以指示环境变化。高原水库由于其蒸发量大、雨季短、旱季长、抗污染能力差的特点,生态系统脆弱,其浮游植物群落的变化对环境条件更为敏感。为了解云贵高原地区乌江渡水库浮游植物的群落结构和演替特征,于2021年6月—2022年5月对乌江渡水库浮游植物群落进行调查,并应用功能群的方法对浮游植物进行分类。结果发现:1)2021年6月—2022年5月,乌江渡水库表层水体中共鉴定出浮游植物106种,共8门67属,其中,生物量最高的为硅藻门,种类数最多的为绿藻门;2)乌江渡水库表层水体理化性质和浮游植物群落存在显著的季节性差异,而相同季节内不同位置差异不显著;3)乌江渡水库表层水体春夏秋季为中—轻度富营养状态,而冬季为中营养状态;4)乌江渡水库中共有浮游植物群落功能群24类,基于优势度,其季节性演替模式为B/C/L0/P(春季)→B/J/L0/P/S1/T(夏季)→B/L0/P/S1/T(秋季)→B/P(冬季),春季和秋季优势功能群关联显著,而夏季和冬季优势功能群关联不显著,相对独立,即浮游植物群落演替伴随着群落稳定性的变化;5)氮磷营养盐、温度和溶解氧是影响乌江渡水库表层浮游植物群落的关键环境因子。本研究提供了云贵高原地区典型高原水体中浮游植物群落结构的背景信息,并从功能群的角度分析了群落的特征及其主要影响因子。

关键词：浮游植物功能群多样性优势度乌江渡水库

Wave field structure and power coupling features of blue-core helicon plasma driven by various antenna geometries and frequencies

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Chinese Physics B 2024年第3期33卷 480-487页

作者：王超刘佳苌磊卢凌峰张世杰周帆涛 State Key Laboratory of Power Transmission Equipment Technology School of Electrical EngineeringChongqing UniversityChongqing 400044China Shanghai Institute of Space Propulsion Shanghai 201112China Southwestern Institute of Physics Chengdu 610041China

This paper deals with wave propagation and power coupling in blue-core helicon plasma driven by various antennas and *** is found that compared to non-blue-core mode,for blue-core mode,the wave can propagate in the core region,and it decays sharply outside the *** power absorption is lower and steeper in radius for blue-core *** the effects of antenna geometry for blue-core mode,it shows that half helix antenna yields the strongest wave field and power absorption,while loop antenna yields the ***,near axis,for antennas with m=+1,the wave field increases with axial *** the core region,the wave number approaches to a saturation value at much lower frequency for non-blue-core mode compared to blue-core *** total loading resistance is much lower for blue-core *** findings are valuable to understanding the physics of blue-core helicon discharge and optimizing the experimental performance of blue-core helicon plasma sources for applications such as space propulsion and material treatment.

关键词： helicon plasma helicon wave helicon discharge radio frequency plasma source

Synchronization and firing mode transition of two neurons in a bilateral auditory system driven by a high–low frequency signal

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Chinese Physics B 2024年第5期33卷 722-735页

作者： Charles Omotomide Apata 唐浥瑞周祎凡蒋龙裴启明 School of Physics and Optoelectronic Engineering Yangtze UniversityJingzhou 434023China

The FitzHugh–Nagumo neuron circuit integrates a piezoelectric ceramic to form a piezoelectric sensing neuron,which can capture external sound signals and simulate the auditory neuron *** piezoelectric sensing neurons are coupled by a parallel circuit consisting of a Josephson junction and a linear resistor,and a binaural auditory system is *** the non-singleness of external sound sources,the high–low frequency signal is used as the input signal to study the firing mode transition and synchronization of this *** is found that the angular frequency of the high–low frequency signal is a key factor in determining whether the dynamic behaviors of two coupled neurons are *** they are in synchronization at a specific angular frequency,the changes in physical parameters of the input signal and the coupling strength between them will not destroy their *** addition,the firing mode of two coupled auditory neurons in synchronization is affected by the characteristic parameters of the high–low frequency signal rather than the coupling *** asynchronous dynamic behavior and variations in firing modes will harm the auditory *** findings could help determine the causes of hearing loss and devise functional assistive devices for patients.

关键词： piezoelectric ceramic Josephson junction auditory neuron synchronization