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Experimental Analysis on Influencing Factors of NO_(x)emission in Gas-Fired Heating and Hot Water Combi-Boilers

Journal of Thermal Science 2021年第4期30卷 1151-1159页

作者： ZHOU Weiye LIU Wenbo LONG Fei zhang jianhai Urban Gas&Heat Research Institute North China Municipal Engineering Design&Research Institute Co.LtdTianjin 300384China China Quality Supervising and Test Center for Gas Appliances Tianjin 300384China

To study the influencing factors of NO_(x)emission in gas-fired heating and hot water combi-boilers,a boiler with the maximum heat input of 26.0 k W was selected,and influencing factors including flue restrictor diameter,fan power,nozzle aperture,nozzle ejection distance and air relative humidity on NO_(x)formation were *** NO_(x)test rig has been built and the concentration of NO_(x)at the rated heat input and the NO_(x)weight value(NO_(x))_(pond)with different heat input in the dry flue gas have been tested respectively according to the test methods in Chinese national standard GB *** results show that with the increase of the diameter of flue restrictor at exhaust outlet,the NO_(x)concentration at the rated heat input and the NO_(x)weight value(NO_(x))_(pond)with different heat input in the dry flue gas decreased by 26.9%and 5.9%;with the increase of the diameter of flue restrictor at air intake inlet,the NO_(x)and(NO_(x))_(pond)decreased by 36.5%and 16.0%;with the increase of fan power,the NO_(x)and(NO_(x))_(pond)can be decreased by 48.4%and 16.1%;with the increase of ejection distance of nozzle,the NO_(x)and(NO_(x))_(pond)decreased by 7.7%and 6.8%;with the increase of aperture of nozzle,the NO_(x)and(NO_(x))_(pond)increased by 5.2%and 2.3%;with the increase of air relative humidity,the NO_(x)decreased by 16.4%and the(NO_(x))_(pond)basically remains *** analysis of the influence factors of NO_(x)emission can be provided as reference for the optimization design of combi-boilers with low NO_(x)emission.

关键词： gas-fired combi-boilers nitrogen oxides excess air coefficient air relative humidity

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A new strength criterion for structured soils

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Journal of Rock Mechanics and Geotechnical Engineering 2013年第2期5卷 156-161页

作者： Enlong Liu Qing Nie jianhai zhang State Key Laboratory of Hydraulics and Mountain River Engineering College of Water Resource and Hydropower Sichuan University

Existing strength criteria are mostly formulated to describe the mechanical properties of reconstituted soils. However, the engineering characteristics of structured soils are different from those of reconstituted soils in many aspects, especially in their strength properties, Thus, the influence of soil structure （bonding and fabric） on the mechanical properties of structured soils cannot be correctly described, By analyzing the breakage mechanism of natural soils, the structured soils can be conceptualized as binary medium materials consisting of bonded blocks and weakened bands. On this basis, a new strength criterion is pro- posed for structured soils, The expressions of the strength criterion on both meridian and deviator planes are given to describe the strength properties of structured soils on these planes. The proposed strength criterion is compared with available test data under conventional and true triaxial stress conditions in the literature. It is observed that the proposed strength criterion agrees well with the test data.

关键词： Strength criterion Structured soils Binary medium model Breakage mechanism

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Multidimensional clinical data denoising via Bayesian CP factorization

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Science China(Technological Sciences) 2020年第2期63卷 249-254页

作者： CUI GaoChao ZHU Li GUI LiHua ZHAO QiBin zhang jianhai CAO JianTing Graduate School of Engineering Saitama Institute of TechnologySaitama 3690293Japan School of Computer Science and Technology Hangzhou Dianzi UniversityHangzhou 310018China Cognitive Science Department School of Information Science and EngineeringXiamen UniversityXiamen 361005China Tensor Learning Unit Center for Advanced Intelligence ProjectRIKENSaitama 1030027Japan School of Automation Guangdong University of TechnologyGuangzhou 510006China

CANDECOMP/PARAFAC(CP) tensor factorization is an efficient technique for incomplete tensor-data processing through capturing the multilinear latent factors. Based on the incorporate a sparsity-inducing prior over multiple latent factors and appropriate hyper-priors over all hyper-parameters, a Bayesian-based hierarchical probabilistic CP factorization model could be formed. By this way, the rank of the incomplete tensor can be determined automatically. In this paper, we explored the tensor completion method in processing incomplete multidimensional electroencephalogram(EEG) and magnetic resonance imaging(MRI) clinical data. The empirical results indicated that the Bayesian CP tensor factorization of incomplete data method can effectively recover EEG signal with missing data and denoised the noisy MRI data.

关键词： electroencephalogram(EEG) magnetic resonance imaging(MRI) Bayesian tensor factorization CANDECOMP/PARAFAC(CP)

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Blast damage zone strength reduction method for deep cavern excavation and its application

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Frontiers of Structural and Civil Engineering 2024年第2期18卷 236-251页

作者： Tianzhi YAO Zuguo MO Li QIAN Yunpeng GAO jianhai zhang Xianglin XING Enlong LIU Ru zhang State Key Laboratory of Hydraulics and Mountain River Engineering College of Water Resources and HydropowerSichuan UniversityChengdu 610065China Power China Chengdu Engineering Corporation Limited Chengdu 610072China

The drill and blast(D&B)method is widely used to excavate underground spaces,but explosions generally cause damage to the ***,no blast simulation method can provide computational accuracy and *** this paper,a blast equivalent simulation method called the blast damage zone strength reduction(BDZSR)method is *** method first calculates the range of the blast-induced damage zone(BDZ)by formulae,then reduces the strength and deformation parameters of the rock within the BDZ ahead of excavation,and finally calculates the excavation damage zone(EDZ)for the D&B method by numerical *** method combines stress wave attenuation,rock damage criteria and stress path variation to derive the BDZ depth calculation *** formulae consider the initial geo-stress,and the reliability is verified by numerical *** calculation of BDZ depth with these formulae allows the corresponding numerical simulation to avoid the time-consuming dynamic calculation process,thus greatly enhancing the calculation *** method was applied to the excavation in Jinping Class II hydropower station to verify its *** results show that the BDZSR method can be applied to blast simulation of underground caverns and provide a new way to study blast-induced damage.

关键词： attenuation of stress wave deep-buried underground building drill and blast in situ stress

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A macro-mesoscopic constitutive model for porous and cracked rock under true triaxial conditions

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Journal of Rock Mechanics and Geotechnical Engineering 2024年第8期16卷 3080-3098页

作者： Li Qian Zuguo Mo jianhai zhang Xianglin Xing Ru zhang Tianzhi Yao Yunpeng Gao State Key Laboratory of Hydraulics and Mountain River Engineering College of Water Resources and HydropowerSichuan UniversityChengdu610065China Power China Chengdu Engineering Corporation Limited Chengdu610072China

The complex mechanical and damage mechanisms of rocks are intricately tied to their diverse mineral compositions and the formation of pores and cracks under external *** rock tests reveal a complex interplay between the closure of porous defects and the propagation of induced cracks,presenting challenges in accurately representing their mechanical properties,especially under true triaxial stress *** paper proposes a conceptualization of rock at the mesoscopic level as a two-phase composite,consisting of a bonded medium matrix and frictional medium *** bonded medium is characterized as a mesoscopic elastic material,encompassing various minerals surrounding porous *** mechanical properties are determined using the mixed multi-inclusion *** of the bonded medium into the frictional medium occurs through crack extension,with its elastoplastic properties defined by the DruckerePrager yield criterion,accounting for hardening,softening,and *** and Eshelby’s equivalent inclusion methods are applied to the bonded and frictional media,*** macroscopic mechanical properties of the rock are derived from these mesoscopic ***,a True Triaxial Macro-Mesoscopic(TTMM)constitutive model is *** model effectively captures the competitive effect and accurately describes the stress-deformation characteristics of *** the TTMM model,the strains resulting from porous defect closure and induced crack extension are differentiated,enabling quantitative determination of the associated damage evolution.

关键词： Micromechanics Macroemesoscopic Homogenization Constitutive model Competitive effect

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Neurodynamics analysis of cochlear hair cell activity

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Theoretical & Applied Mechanics Letters 2020年第1期10卷 8-15页

作者： Weifeng Rong Rubin Wang jianhai zhang Wanzeng Konga School of Computer Science Hangzhou Dianzi UniversityHangzhou 310018China Institute for Cognitive Neurodynamics East China University of Science and TechnologyShanghai 200237China

There have been many studies on the effect of cochlea basal membrane movement on the resolution of different frequencies and ***,these studies did not take into account the influence of power and energy consumption of the hair cells in the process of the electromotility movement,as well as the neurodynamic mechanism that produced this *** makes previous studies unable to fully clarify the function of outer hair cells(OHCs)and the mechanism of sound *** this end,we introduce the gate conductance characteristics of the hair cells in the mechanical process of increasing frequency *** research finds that the low attenuation of OHCs membrane potential and the high gain in OHC power and energy consumption caused that OHC amplification is driven by *** research results show that the amplification of the OHCs is driven by low attenuation of membrane potential and high gain of power and energy *** conclusion profoundly reveals the physiological mechanism of the electromotility movement.

关键词： Hair cells Sound frequencies Membrane potential Power Outer hair cell amplification

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Denoising method of X-ray phase contrast DR image for TRISO-coated fuel particles

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Particuology 2013年第6期11卷 695-702页

作者： Min Yang jianhai zhang Fanyong Meng Sung-Jin Song Xingdong Li Wenli Liu Dongbo Wei School of Mechanical Engineering and Automation Beijing University of Aeronautics School of Mechanical Engineering Sungkyunkwan University State Key Laboratory of Multiphase Complex Systems Institute of Process EngineeringChinese Academy of Sciences National Institute of Metrology

TRISO （tristructural-isotropic） fuel is a type of micro fuel particles used in high-temperature gas-cooled reactors （HTGRs）. Among the quality evaluation methods for such particles, inqine phase contrast imaging technique （PCI） is more feasible for nondestructive measurement. Due to imaging hardware limitations, high noise level is a distinct feature of PCI images, and as a result, the dimensional measurement accuracy of TRISO-coated fuel particles decreases. Therefore, we propose an improved denoising hybrid model named as NL P-M model which introduces non-local theory and retains the merits of the Perona-Malik （P-M） model. The improved model is applied to numerical simulation and practical PCI images. Quanti- tative analysis proves that this new anisotropic diffusion model can preserve edge or texture information effectively, while ruling out noise and distinctly decreasing staircasing artifacts. Especially during the process of coating layer thickness measurement, the NL P-M model makes it easy to obtain continuous contours without noisy points or fake contour segments, thus enhancing the measurement accuracy. To address calculation complexity, a graphic processing unit （GPU） is adopted to realize the acceleration of the NL P-M denoising.

关键词： TRISO-coated fuel particle X-ray phase contrast imaging Image denoising Partial differential equation Non-local means

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Scaling relationships of elastic-perfectly plastic film/coating materials from small scale sharp indentation

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Science China(Technological Sciences) 2021年第6期64卷 1302-1310页

作者： WANG ZhaoXin WANG JiRu WANG Wen Yang NIU YiHan LI Cong ZONG XiangYu zhang jianhai ZHAO HongWei Key Laboratory of CNC Equipment Reliability Ministry of EducationJilin UniversityChangchun 130025China School of Mechanical&Aerospace Engineering Jilin UniversityChangchun 130025China

The scaling relationships of elastic-perfectly plastic film/coating materials during sharp indentation have been obtained using dimensional analysis and finite-element modeling. Besides the bulk substrate materials, a wide range of film/coating materials with different ratios in term of the Young’s modulus and yield strength were examined, namely different values of Ef/Esand Yf/*** on these scaling relationships, the substrate effects on indentation response and deformed surface profile of residual imprint are given. Furthermore, the scaling relationship among the work of indentation, reduced elastic modulus and hardness has been found. It is found that the ratio of the indentation hardness to measurement of substrate elastic modulus could be used to characterize the wear resistance of film/coating materials. In addition, a novel method to acquire the intrinsic hardness and elastic modulus of film/coating materials is proposed combined with the well-known 10% critical indentation depth rule, which avoids the error caused by estimating the contact area. This work could be contributed for characterizing the mechanical properties of film/coating materials at micro-and nanoscale.

关键词： scaling relationships substrate effect dimensional analysis finite element modeling film/coating materials indentation

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Embedded BCI Rehabilitation System for Stroke

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Journal of Beijing Institute of Technology 2019年第1期28卷 35-41页

作者： Wanzeng Kong Siman Fu Bin Deng Hong Zeng jianhai zhang Shijie Guo School of Computer Science and Technology Hangzhou Dianzi University Fujian Key Laboratory of Rehabilitation Technology(Fuzhou)

In stroke rehabilitation,rehabilitation equipments can help with the *** traditional equipments are not convenient to carry,which limits patients to use related rehabilitation *** solve this kind of problem,a new embedded rehabilitation system based on brain computer interface(BCI)is proposed in this *** system is based on motor imagery(MI)therapy,in which electroencephalogram(EEG)is evoked by grasping motor imageries of left and right hands,then collected by a wearable *** EEG is transmitted to a Raspberry Pie processing unit through Bluetooth and decoded as the instructions to control the equipment *** experience the limb movement through the visual feedback so as to achieve active rehabilitation.A pilot study shows that the user can control the movement of the rehabilitation equipment through his mind,and the equipment is convenient to *** study provides a new way to stroke rehabilitation.

关键词： stroke rehabilitation embedded brain computer interface(BCI) motor imagery(MI)

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预处理共轭梯度法在岩土工程有限元中的应用

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岩石力学与工程学报 2007年第A01期26卷 2820-2826页

作者：郑超张建海四川大学水利水电学院四川成都610065

在岩土工程中进行有限元分析时需要求解大型线性方程组,常用的直接法会占用较大的内存,耗费计算时间较长,计算节点规模有限。用超松弛迭代–预处理共轭梯度法(SSOR-PCG)求解大型稀疏线性方程组,并提出SSOR-PCG法的一套优化内存占用量和... 详细信息

在岩土工程中进行有限元分析时需要求解大型线性方程组,常用的直接法会占用较大的内存,耗费计算时间较长,计算节点规模有限。用超松弛迭代–预处理共轭梯度法(SSOR-PCG)求解大型稀疏线性方程组,并提出SSOR-PCG法的一套优化内存占用量和计算时间的实现方案。算例结果证明,此方案下的求解器在一台奔腾2.80 GHz主频、1.0 GB内存的个人电脑上,在50 min之内,可求解约30×104节点三维模型的刚度方程,其计算结果也可满足需要。

关键词：岩土工程超松驰迭代法(SSOR) 预处理共轭梯度法(PCG) 线性方程组

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