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Off-design performance of a chemical looping combustion (CLC) combined cycle:effects of ambient temperature

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Journal of Thermal Science 2010年第1期19卷 87-96页

作者： jinling Chi Bo Wang Shijie Zhang Yunhan Xiao Key Laboratory of Advanced Energy and Power Chinese Academy of Sciences (Institute of Engineering Thermophysics) P. O. Box 2706 Beijing 100190 China Graduate University of the Chinese Academy of Sciences Beijing 100049 China

The present work investigates the influence of ambient temperature on the steady-state off-design thermodynamic performance of a chemical looping combustion(CLC) combined cycle.A sensitivity analysis of the CLC reactor system was conducted,which shows that the parameters that influence the temperatures of the CLC reactors most are the flow rate and temperature of air entering the air *** the ambient temperature variation,three off-design control strategies have been assumed and compared:1) without any Inlet Guide Vane(IGV) control,2) IGV control to maintain air reactor temperature and 3) IGV control to maintain constant fuel reactor temperature,aside from fuel flow rate *** indicate that,compared with the conventional combined cycle,due to the requirement of pressure balance at outlet of the two CLC reactors,CLC combined cycle shows completely different off-design thermodynamic characteristics regardless of the control strategy *** the first control strategy,temperatures of the two CLC reactors both rise obviously as ambient temperature *** control adopted by the second and the third strategy has the effect to maintain one of the two reactors' temperatures at design condition when ambient temperature is above design *** with the second strategy,the third would induce more severe decrease of efficiency and output power of the CLC combined cycle.

关键词： Chemical looping combustion Combined cycle Off-design performance Thermodynamic analysis Ambient temperature

The Dual-Polarized Staggered Stacked Patches Antenna

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China Communications 2021年第12期18卷 208-218页

作者： Xinyu Cao jinling Zhang Hongzhen Yang Hourong Li School of Electrical and Control Engineering North China Institute of Aerospace EngineeringLangfang Hebei 065000China School of Electronic Engineering Beijing University of Posts and TelecommunicationsBeijing 100876China

A new dual-polarized staggered and stacked patches antenna with wide impedance band-width and high isolation is *** antenna consists of two groups of radiation patches,in 7 layers,and uses the orthogonal adjacent coupling structure on staggered layer to excite a pair of linear polarization *** to the staggered feeder mode,it has increased the isolation performance be-tween ports and compressed the transverse size of the *** a result of the combination of staggered stack-up between the patches and the stepped gradient shape of the main radiating patches,it has effectively expanded the impedance bandwidth of the *** proposed antenna is simulated,fabricated and *** staggered feeding structure effectively reduces the cross-sectional area of the antenna,and greatly improves the isolation between feeding *** measurement results show that the impedance bandwidths for vertical and horizontal polarization modes are 40.2%(638-960 MHz)and 40.0%(645-968 MHz)respectively when the return loss is lower than-10 dB,and the isolation between feeding ports is better than-30 ***,the antenna has a stable and symmetrical radiation pattern across the working band,therefore making it suitable to be used as antenna and antenna array element of mobile wireless communication base stations.

关键词： staggered stacked patches wide impedance bandwidth high isolation

Critical observability of partially observed discrete event systems under cyber attacks

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Science China(Information Sciences) 2024年第2期67卷 333-334页

作者： Liyun TONG jinling LIANG Yang LIU Department of Mathematics School of SciencesHangzhou Dianzi University School of Mathematics Southeast University College of Mathematics and Computer Science Zhejiang Normal University

The discrete event system(DES) is a dynamic system driven by asynchronous/sudden events and has been widely used in many critical infrastructures, such as electric transportation networks and intelligent transportatio...

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Chemistry and source identification of wet precipitation in a rural watershed of subtropical China

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Chinese Journal Of Geochemistry 2012年第4期31卷 347-354页

作者： HUANG Laiming YANG jinling ZHANG Ganlin State Key Laboratory of Sod and Sustamable Agrtculture Institute of Soil ScienceChinese Academy of SciencesNanjing 210008China Graduate University of Chinese Academy of Sciences Beijing 100049China

South China is one of the regions severely suffering from acid rain in the ***,few systematic studies of rural precipitation chemistry have been performed in comparison with the extensive studies on their urban counterparts of this *** order to characterize the current acid rain status and identify its possible sources in the rural area of South China,we analyzed precipitation collected event by event from a rural forested watershed in southern Anhui Province between March 2007 and February *** results showed that the concentrations of major ions within precipitation in the studied rural area were significantly lower than those reported for the urban areas of the same latitude in ***,the precipitation acidity(with an average pH value of 4.49) and the frequency of acid rain(95%) were considerably *** relatively high ratio of(SO42+ NO 3)/(Ca2+ +NH4+) was the main cause of acid rain in this rural area,as SO 2 and NO x were the main precursors of acid rain,while Ca2+ and NH4+acted as the dominant neutralizers to the *** identification indicated that Ca2+ and Mg2+ mainly were derived from alkaline dust,SO42,NO 3 and NH4+originated mainly from anthropogenic sources such as industrial and agricultural activities,most Na +,Cl,K + and some of Mg2+ were derived from the *** results suggested that the major ions within precipitation in the rural area of South China were related to the meso-scale and long-range transport of particles and aerosols in the air.

关键词：农村地区降水化学分水岭源识别中国沉淀亚热带湿法

长期服用糖皮质激素和(或)免疫抑制剂合并奴卡菌病的临床预后分析

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中华肾病研究电子杂志 2017年第6期6卷 271-277页

作者：陈仆谢院生刘述文汤力王涌孟金铃尹忠刘娇娜赵薇张洁蔡广研解放军总医院肾脏病科解放军肾脏病研究所肾脏疾病国家重点实验室国家慢性肾病临床医学研究中心北京100853 解放军总医院呼吸科北京100853 解放军总医院风湿科北京100853 解放军总医院肾脏病科解放军肾脏病研究所肾脏疾病国家重点实验室

目的回顾性分析长期服用糖皮质激素和(或)免疫抑制剂合并奴卡菌病患者的临床特征、诊疗及预后。方法入选我院近5年来长期服用糖皮质激素和(或)免疫抑制剂患者明确诊断奴卡菌病的病例7例。奴卡菌病诊断标准:体液(痰液、血液、胸腔积液、... 详细信息

目的回顾性分析长期服用糖皮质激素和(或)免疫抑制剂合并奴卡菌病患者的临床特征、诊疗及预后。方法入选我院近5年来长期服用糖皮质激素和(或)免疫抑制剂患者明确诊断奴卡菌病的病例7例。奴卡菌病诊断标准:体液(痰液、血液、胸腔积液、脓液)和(或)组织学(皮肤活检、肺活检)细菌培养结果为奴卡菌。播散性奴卡菌病诊断标准:奴卡菌病培养阳性,同时累及≥2个器官的化脓性感染。结果 7例患者中男性5例(71%),女性2例(29%),平均(56.1±11.6)岁。3例原发病为肾病综合征,4例为自身免疫性疾病,均接受了长期激素和(或)免疫抑制剂治疗。5例院外曾给予抗感染治疗,但治疗效果不佳。发生感染时免疫抑制治疗的中位疗程6个月(IQR 5~9)。入院时糖皮质激素的平均剂量(21.0±8.8)mg。7例均存在肺奴卡菌病,其中5例为播散性奴卡菌病(1例为皮肤播散至肺部、腹腔、腹膜后,1例为皮肤播散至肺部、颅内,1例为肺部播散至颅内,1例为肺部播散至皮肤,1例为皮肤播散至肺部)。中位播散时间2个月。6例病程中出现中高热,最高体温平均(39.5±0.7)℃。7例均有咳嗽、咳痰,3例呼吸困难,2例胸痛,1例咯血。5例皮肤奴卡菌病表现为皮下脓肿,其中1例还合并关节脓肿。2例颅内感染患者出现视物模糊,其中1例伴有癫痫。7例(100%)患者均CRP升高,平均(114±140)mg/L。降钙素原平均水平为0.4(IQR 0.14~0.64)μg/L,仅1例(1/6,17%)升高。6例(6/7,86%)淋巴细胞比例降低,其中5例低于10%。2例(2/2,100%)患者的CD4^+计数<200/μl,CD4^+/CD8^+比值明显下降。IgG平均水平(7 650±2 269)mg/L。白蛋白平均水平(30.6±6.6)g/L。肺部CT常见改变为空洞5例(71%)、结节5例(71%)、斑片影5例(71%)、磨玻璃影5例(71%)。各种类型体液及组织细菌培养阳性率分别为:肺组织活检(1/1,100%)、脓液(3/3,100%)、胸腔积液(2/4,50%)、痰培养(3/7,43%)及血培养(2/6,33%)。磺胺和(或)利萘胺为基础的治疗方案有效率71%,2例(29%)死亡,2例(29%)停药后复发。结论奴卡菌病是一种机会性感染,误诊率高,易全身播散,易复发。组织活检及无菌体液培养阳性率较高。早期诊断与合理治疗方案是改善预后、减少播散与复发的关键。

关键词：奴卡菌病糖皮质激素免疫抑制剂免疫缺陷临床预后

Mechanical Properties and Fracture Behavior of Mg-Al/AlN Composites with Different Particle Contents

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Journal of Materials Science & Technology 2017年第7期33卷 668-674页

作者： Jie Chen Chonggao Bao Wenhui Chen Li Zhang jinling Liu State Key Laboratory of Traction Power School of Mechanics and Engineering SouthwestJiaotong University Chengdu 610031 China

In this study, magnesium matrix composites reinforced with different loading of AlN particles were fabricated by the powder metallurgy technique. The microstructure, bending strength and fracture behavior of the resulting Mg-Al/Al N composites were investigated. It showed that the 5 wt% AlN reinforcements led to the highest densification and bending strength. The total strengthening effect of AlN particles was predicted by considering the contributions of CTE mismatch between the matrix and the particles,load bearing and Hall-Petch mechanism. The results revealed that the increase of dislocation density,the change of Mg17Al12 phase morphology, and the effective load transfer were the major strengthening contributors to the composites. The fracture of the composites altered from plastic to brittle mode with increasing reinforcement content. The regions of clustered particles in the composites were easy to be damaged under external load, and the fracture occurred mainly along grain boundaries.

关键词： Magnesium matrix composite AlN particle Bending strength Fracture behavior Microstructure Powder metallurgy

Some Remarks on the Convex Feasibility Problem and Best Approximation Problem

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Numerical Mathematics(Theory,Methods and Applications) 2008年第1期1卷 78-91页

作者： Qingzhi Yang jinling Zhao School of Mathematics and LPMC Nankai University Tianjin 300071 China School of Applied Science University of Science and Technology Beijing 100080 China

In this paper we investigate several solution algorithms for the convex fea- sibility problem(CFP)and the best approximation problem(BAP)*** algorithms analyzed are already known before,but by adequately reformulating the CFP or the BAP we naturally deduce the general projection method for the CFP from well-known steepest decent method for unconstrained optimization and we also give a natural strategy of updating weight *** the linear case we show the connec- tion of the two projection algorithms for the CFP and the BAP *** addition, we establish the convergence of a method for the BAP under milder assumptions in the linear *** also show by examples a Bauschke's conjecture is only partially correct.

关键词： Convex feasibility problem best approximation problem projection method convergence

Research of the terahertz dual-band notch filter based on FSS structures

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Chinese Science Bulletin 2013年第36期58卷 4687-4691页

作者： ZHANG jinling ZHANG Yu GAO Ke ZHAO GuoZhong School of Electronic Engineering Beijing University of Posts and Telecommunications School of Physics Capital Normal University

In this paper,a dual-band notch filter for two-layer frequency selective surface(FSS)at terahertz(THz)frequency with high filtering performance has been realized on high-resistivity silicon *** periodic metallic resonators patterned on the silicon wafer,the designed filter can provide two tunable resonant frequencies for terahertz *** transmission response was improved by introducing an extra surrounding pattern around the T-shaped structure,and the location of transmission drop was tuned independently with geometric *** by finite-integral time-domain method,the filter is designed to operate between 0.2 and 0.6 THz with dual-band band-stop performance,a salient feature of this design is making the low sensitivity of its frequency response to the incident angles,which allows to place the filter close to the radiation source with spherical wave *** proposed structures were fabricated using photolithography and tested by THz time-domain spectroscopy *** results show that the transmission response has more than 12 and 32 dB rejections near 285 and 460 GHz respectively,which is in good agreement with the simulation result.

关键词：陷波滤波器太赫兹波 T形结构双频段 FSS 太赫兹时域光谱频率选择表面谐振频率

A review of measurement methods for peracetic acid (PAA)

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Frontiers of Environmental Science & Engineering 2020年第5期14卷 127-136页

作者： Chen Cheng Haodong Li jinling Wang Hualin Wang Xuejing Yang National Engineering Laboratory for Industrial Wastewater Treatment East China University of Science and Technology(ECUST)Shanghai 200237China State Key Laboratory of Chemical Engineering ECUSTShanghai 200237China

Peroxyacetic acid has been widely used in food,medical,and synthetic chemical fields for the past several ***,peroxyacetic acid has gradually become an effective alternative disinfectant in wastewater disinfection and has strong redox capacity for removing micro-pollutants from drinking ***,commercial peroxyacetic acid solutions are primarily multi-component mixtures of peroxyacetic acid,acetic acid,hydrogen peroxide,and *** the process of water treatment,peroxyacetic acid and hydrogen peroxide(H2O2)often coexist,which limits further investigation on the properties ofperoxyacetic ***,analytical methods need to achieve a certain level of selectivity,particularly when peroxyacetic acid and hydrogen peroxide *** review summarizes the measurement and detection methods of peroxyacetic acid,comparing the principle,adaptability,and relative merits of these methods.

关键词： Peroxyacetic acid Measurement methods Titration Colorimetric Chromatography NMR