期刊文献+
共找到18篇文章
< 1 >
每页显示 20 50 100
Hydrogen Sulfide Prevents ATP-induced Neurotoxicity via Inhibiting The NLRP1/caspase-1/gasdermin D-mediated Pyroptosis Pathway
1
作者 REN Yan-Kai LI Ying-Hong +4 位作者 LI Man-Li YANG Kun-Li FAN Zhi-Ru ZHANG Si-Yu LI Dong-Liang 《生物化学与生物物理进展》 北大核心 2025年第3期724-734,共11页
Objective Stroke is a leading cause of death and disability worldwide,with ischemic stroke accounting for 80%-85%of cases.Despite the prevalence,effective treatments remain scarce.The compelling evidence suggest that ... Objective Stroke is a leading cause of death and disability worldwide,with ischemic stroke accounting for 80%-85%of cases.Despite the prevalence,effective treatments remain scarce.The compelling evidence suggest that high concentrations of ATP in the brain post-stroke can trigger irreversible neuronal damage and necrosis,contributing to a range of neurocellular dysfunctions.Pyroptosis,a recently identified form of programmed cell death,is characterized by caspase-1 activation and the action of the Gasdermin D(GSDMD)protein family,leading to cell perforation and inflammatory death.Methods In this study,human neuroblastoma SH-SY5Y cells were used to investigate the mechanisms of ATP-induced neurotoxicity and the protective effects of hydrogen sulfide(H_(2)S)against this toxicity through the antagonization of pyroptosis.We employed CCK-8 and LDH assays to assess cell viability.YO-PRO-1 fluorescent dyes and flow cytometry were conducted for detecting changes in cell membrane permeability.Western blot analysis was used to measure protein levels associated with cellular dysfunction.Results Our results indicate that high concentrations of ATP enhance cytotoxicity and increase cell membrane permeability in SH-SY5Y cells,that are mitigated by the H_(2)S donor NaHS.Furthermore,ATP was found to promote the activation of the NOD-like receptor pyrin domain-containing 1(NLRP-1),caspase-1,and the cleavage of GSDMD,with NaHS significantly attenuating these effects.Conclusion Our research suggests that H2S protects SH-SY5Y cells from ATP-induced neurotoxicity through a mechanism mediated by the NLRP1,caspase-1,and GSDMD pathway. 展开更多
关键词 STROKE ATP H2S NLRP1 CASPASE-1 GSDMD PYROPTOSIS
在线阅读 下载PDF
A coupled strain softening and hardening model for completely weathered granite in a fault zone
2
作者 DU Shao-hua XIAO Peng +3 位作者 LI Di-yuan MAO Da-wei RUAN Bo ZHANG Rui-chao 《Journal of Central South University》 SCIE EI CAS CSCD 2024年第9期3225-3241,共17页
his study focused on exploring the specificity of mechanical behavior for completely weathered granite,as a special soil,by consolidated drained triaxial tests.The influences of dry density(1.60,1.70,1.80 and 1.90 g/c... his study focused on exploring the specificity of mechanical behavior for completely weathered granite,as a special soil,by consolidated drained triaxial tests.The influences of dry density(1.60,1.70,1.80 and 1.90 g/cm^(3)),confining pressure(100,200,400 and 600 kPa),and moisture content(13.0%,that is,natural moisture content)were investigated in the present work.A newly developed Duncan-Chang model was established based on the experimental data and Duncan-Chang model.The influence of each parameter on the type of the proposed model curve was also evaluated.The experimental results revealed that with varying dry density and confining pressure,the deviatoric stress–strain curves have diversified characteristics including strain-softening,strain-stabilization and strain-hardening.Under high confining pressure condition,specimens with different densities all showed strain-hardening characteristic.Whereas at the low confining pressure levels,specimens with higher densities gradually transform into softening characteristics.Except for individual compression shear failure,the deformation modes of the specimens all showed swelling deformation,and all the damaged specimens maintained good integrity.Through comparing the experiment results,the strain-softening or strain-hardening behavior of CWG specimens could be predicted following the proposed model with high accuracy.Additionally,the proposed model can accurately characterize the key mechanical indicators,such as tangent modulus,peak value and residual strength,which is simple to implement and depends on fewer parameters. 展开更多
关键词 completely weathered granite mechanical behavior consolidated drained triaxial test constitutive model
在线阅读 下载PDF
Evaluation of the slipstream in different regions around a train with respect to different nose lengths:A comparison study
3
作者 WANG Lei LIU Tang-hong +3 位作者 CHEN Zheng-wei ZENG Guang-zhi HEMIDA Hassan XIA Yu-tao 《Journal of Central South University》 SCIE EI CAS CSCD 2024年第9期3295-3311,共17页
In this work,the flow surrounding the train was obtained using a detached eddy simulation(DES)for slipstream analysis.Two different streamlined nose lengths were investigated:a short nose(4 m)and a long nose(9 m).The ... In this work,the flow surrounding the train was obtained using a detached eddy simulation(DES)for slipstream analysis.Two different streamlined nose lengths were investigated:a short nose(4 m)and a long nose(9 m).The time-average slipstream velocity and the time-average slipstream pressure along the car bodies were compared and explained in detail.In addition to the time-averaged values,the _(max)imum velocities and the pressure peak-to-peak values around the two trains were analyzed.The result showed that the nose length affected the slipstream velocity along the entire train length at the lower and upper regions of the side of the train.However,no significant effect was recognized at the middle height of the train along its length,except in the nose region.Moreover,within the train’s side regions(y=2.0-2.5 m and z=2-4 m)and(y=2.5-3.5 m and z=0.2-0.7 m),the ratio of slipstream velocity U_(max) between the short and long nose trains was notably higher.This occurrence also manifested at the train’s upper section,specifically where y=0-2.5 m and z=4.2-5.0 m.Similarly,regarding the ratio of _(max)imum pressure peak-to-peak values Cp-p_(max),significant regions were observed at the train’s side(y=1.8-2.6 m and z=1-4 m)and above the train(y=0-2 m and z=3.9-4.8 m). 展开更多
关键词 high-speed train nose length slipstream velocity pressure change
在线阅读 下载PDF
论明人王骥德的《琵琶记》批评
4
作者 余丹 《中国文学研究》 CSSCI 北大核心 2013年第2期58-60,共3页
王骥德是晚明重要的戏曲理论家,他对"南戏之祖"《琵琶记》的批评涉及命意戏曲语言以及审美效果等方面,对中国古典戏曲史上若干重大命题如"风化"、"本色"、"动人"等都有所阐发,具有很高的理论... 王骥德是晚明重要的戏曲理论家,他对"南戏之祖"《琵琶记》的批评涉及命意戏曲语言以及审美效果等方面,对中国古典戏曲史上若干重大命题如"风化"、"本色"、"动人"等都有所阐发,具有很高的理论价值。 展开更多
关键词 王骥德 《琵琶记》 “风化” “本色” “动人”
在线阅读 下载PDF
自拟化痰通窍熄风定痫方联合德巴金治疗儿童癫痫疗效观察
5
作者 董景新 牛利利 赵鹏 《辽宁中医杂志》 CAS 北大核心 2024年第11期94-98,共5页
目的探究自拟化痰通窍熄风定痫方联合德巴金对儿童癫痫的临床疗效。方法选取2019年1月—2022年4月该院风痰闭阻型癫痫患儿150例为研究对象,按随机数字表法,将入组患儿均分为治疗组和对照组,各75例。对照组予德巴金治疗,治疗组予自拟化... 目的探究自拟化痰通窍熄风定痫方联合德巴金对儿童癫痫的临床疗效。方法选取2019年1月—2022年4月该院风痰闭阻型癫痫患儿150例为研究对象,按随机数字表法,将入组患儿均分为治疗组和对照组,各75例。对照组予德巴金治疗,治疗组予自拟化痰通窍熄风定痫方联合德巴金治疗,两组均持续治疗3个月。比较两组治疗后临床疗效,治疗前后中医症状积分、炎症指标[超敏C-反应蛋白(hypersensitive C-reactive protein,hs-CRP)、红细胞沉降率(erythrocyte sedimentation rate,ESR)、肿瘤坏死因子-α(tumor necrosis factor-α,TNF-α)]、脑电图、青少年癫痫患儿生活质量评定量表(QOLIE-AD-48)变化,及患儿癫痫发作次数、持续时间,记录治疗期间不良反应。结果治疗后,治疗组临床有效率显著高于对照组[93.33%(70/75)vs 82.67%(62/75),P<0.05];治疗后,两组中医各项积分均下降(P<0.05),且治疗组主症、次症积分均低于对照组(P<0.05);治疗后,治疗组脑电图好转总有效率86.67%(65/75)高于对照组72.00%(54/75)(P<0.05);治疗后,两组QOLIE-AD-48评分均升高(P<0.05),且治疗组高于对照组(P<0.05);治疗后,两组血清hs-CR、TNF-α、ESR水平均下降(P<0.05),且治疗组低于对照组(P<0.05);治疗后,两组癫痫发作次数及发作时持续时间均降低(P<0.05),且治疗组上述指标均低于对照组(P<0.05);治疗期间,均未见严重不良反应。结论自拟化痰通窍熄风定痫方联合德巴金可提高风痰闭阻型儿童癫痫的临床疗效,控制其症状,减轻炎症反应,有利于改善患儿脑电图指标,降低发作频率和持续时间,可提高患儿生活质量。 展开更多
关键词 自拟化痰通窍熄风定痫方 德巴金 风痰闭阻型 儿童癫痫 脑电图 炎症指标
在线阅读 下载PDF
Dynamic change and diagnosis of physical, chemical and biological properties in bauxite residue disposal areas 被引量:6
6
作者 GUO Ying ZHU Feng +2 位作者 WU Chuan TIAN Tao XUE Sheng-guo 《Journal of Central South University》 SCIE EI CAS CSCD 2019年第2期410-421,共12页
Vegetation encroachment occurred in bauxite residue disposal area(BRDA)following natural weathering processes,whilst the typical indicators of soil formation are still uncertain.Residue samples were collected from the... Vegetation encroachment occurred in bauxite residue disposal area(BRDA)following natural weathering processes,whilst the typical indicators of soil formation are still uncertain.Residue samples were collected from the BRDA in Central China,and related physical,chemical and biological indicators of bauxite residue with different storage years were determined.The indicators of soil formation in bauxite residue were selected using principal component analysis,factor analysis,and comprehensive evaluation to establish soil quality diagnostic index model on disposal areas.Following natural weathering processes,the texture of bauxite residue changed from silty loam to sandy loam.The pH and EC decreased,whilst porosity,nutrient element content and microbial biomass increased.The identified minimum data set(MDS)included available phosphorus(AP),moisture content(MC),C/N,sand content,total nitrogen(TN),microbial biomass carbon(MBC),and pH.The soil quality index of bauxite residue increased,and the relative soil quality index decreased from 1.89 to 0.15,which indicated that natural weathering had a significant effect on improveing the quality of bauxite residue and forming a new soil-like matrix.The diagnostic model of bauxite residue was established to provide data support for the regeneration on disposal area. 展开更多
关键词 bauxite residue disposal area soil properties minimum data set diagnostic indices natural weathering soil formation in bauxite residue
在线阅读 下载PDF
Reservoir characteristics and hydrocarbon accumulation of Carboniferous volcanic weathered crust of Zhongguai high area in the western Junggar Basin, China 被引量:4
7
作者 LI Hu TANG Hong-ming +4 位作者 QIN Qi-rong FAN Cun-hui HAN Song YANG Cang ZHONG Cheng 《Journal of Central South University》 SCIE EI CAS CSCD 2018年第11期2785-2801,共17页
Based on the drilling,cores,logs,seismic,laboratory analysis and so on,reservoir characteristics and hydrocarbon accumulation of Carboniferous volcanic weathered crust in Zhongguai high area are studied.Volcanic rocks... Based on the drilling,cores,logs,seismic,laboratory analysis and so on,reservoir characteristics and hydrocarbon accumulation of Carboniferous volcanic weathered crust in Zhongguai high area are studied.Volcanic rocks were formed in an island arc environment.The lithology is mainly andesite and tuff;Reservoir spaces are mainly secondary pore,fracture and their combination forms,fractures have a better effect on reservoir seepage;There are four layer structures of volcanic weathered crust,weathered clay layer,strongly weathered zone,weakly weathered zone and unweathered zone and strongly weathered zone is the best,which is the main reservoir development zone;The development of reservoir is mainly affected by weathering-leaching,lithology and lithofacies,and fault(fracture);Effective reservoirs could reach to 480 m thickness(high quality reservoirs are within 240 m).Carboniferous volcanic reservoirs are distributed along three zones,which are near the fault zone,high structural part,favorable lithofacies development zone,and one plane,which is near the unconformity. 展开更多
关键词 reservoir characteristics volcanic weathered crust fracture hydrocarbon accumulation CARBONIFEROUS Zhongguai high area
在线阅读 下载PDF
Geochemistry of lower Silurian shale of Longmaxi Formation,southeastern Sichuan Basin,China:Implications for provenance and source weathering 被引量:3
8
作者 郭岭 贾超超 杜伟 《Journal of Central South University》 SCIE EI CAS CSCD 2016年第3期669-676,共8页
Lower Silurian Longmaxi Shale(SLS) in southeastern Sichuan Basin, China, was analyzed for major and selected trace elements, and their provenance, intensity of palaeoweathering of the source rocks were analyzed based ... Lower Silurian Longmaxi Shale(SLS) in southeastern Sichuan Basin, China, was analyzed for major and selected trace elements, and their provenance, intensity of palaeoweathering of the source rocks were analyzed based on these elements. The results show that SiO_2, Al_2O_3 and Fe_2O_3, are dominant major elements with average contents of 60.59%, 15.91% and 5.87% in Upper Silurian Longmaxi Shale(USLS), and 65.14%, 13.24% and 4.68% in Lower Silurian Longmaxi Shale(LSLS). The TiO_2-Zr plot, Hf(ppm) versus La/Th discriminant diagram, and abundance of Cr and Ni suggest a dominantly felsic source for the Longmaxi sediments. Average chemical index of alteration(CIA), plagioclase index of alteration(PIA) values(64.05% and 72.86%, respectively) imply low-degree chemical weathering of the source material in early Longmaxi time, and average CIA, PIA values(68.44% and 80.35%, respectively) imply moderate chemical weathering of the source material in late Longmaxi time. 展开更多
关键词 trace elements black shale PROVENANCE WEATHERING discriminant diagrams Sichuan Basin
在线阅读 下载PDF
Field trial on use of soybean crude extract for carbonate precipitation and wind erosion control of sandy soil 被引量:17
9
作者 GAO Yu-feng MENG Hao +2 位作者 HE Jia QI Yong-shuai HANG Lei 《Journal of Central South University》 SCIE EI CAS CSCD 2020年第11期3320-3333,共14页
Wind erosion is a major cause of land desertification and sandstorm formation in arid and semi-arid areas.The objective of this study was to evaluate the potential of soybeans crude extract induced calcium carbonate p... Wind erosion is a major cause of land desertification and sandstorm formation in arid and semi-arid areas.The objective of this study was to evaluate the potential of soybeans crude extract induced calcium carbonate precipitation(SICP)on reducing wind erosion risk of sandy soil.Field tests were carried out in Ulan Buh Desert,Ningxia Hui Autonomous Region,China.Results showed that the SICP method could significantly enhance the surface strength and wind erosion resistance of the topsoil.The optimal cementation solution(urea-CaCl2)concentration and spraying volume,according to experiments conducted on sandy land,were 0.2 mol/L and 4 L/m^2,respectively.Under this condition,the CaCO3 content was approximately 0.45%,the surface strength of sandy soil could reach 306.2 kPa,and the depth of wind erosion was approximately zero,after 30 d completion of SICP treatment.Soil surface strength declined with the increase of time,and long-term sand fixation effects of SICP treatment varied depending on topography.Whereas wind erosion in the top area of the windward slope was remarkable,sandy soils on the bottom area of the windward slope still maintained a relatively high level of surface strength and a low degree of wind erosion 12 month after SICP treatment.Scanning electron microscopy(SEM)tests with energy dispersive X-ray(EDX)confirmed the precipitation of CaCO3 and its bridge effect.These findings suggested that the SICP method is a promising candidate to protect sandy soil from wind erosion in desert areas. 展开更多
关键词 soybeans crude extract induced calcium carbonate precipitation(SICP) biocementation sandy soil erosion controll field tests
在线阅读 下载PDF
Prediction and optimization of aerodynamic noise in an automotive air conditioning centrifugal fan 被引量:14
10
作者 杨振东 谷正气 +2 位作者 汪怡平 颜建容 杨晓涛 《Journal of Central South University》 SCIE EI CAS 2013年第5期1245-1253,共9页
The high aerodynamic noise induced by automotive air conditioning systems has important effects on the ride comfort, and the centrifugal fan is the largest noise source in these systems. It is very important to reduce... The high aerodynamic noise induced by automotive air conditioning systems has important effects on the ride comfort, and the centrifugal fan is the largest noise source in these systems. It is very important to reduce the aerodynamic noise generated by the centrifugal fan. The flow field and the sound field on the whole centrifugal fan configuration have been carried out using the computational fluid dynamics. Simulation results show that the sound pressure level near the outlet of the centrifugal fan is too high. Based on the relationship between flow characteristics and the aerodynamic noise, four parameters of the centrifugal fan, i.e., impeller blade's outlet angle 0, volute tongue's gap t, collector inclination angle fl, and rotating speed n, were selected as design variables and optimized using response surface methodology. While keeping the function of flow rate unchanged, the peak noise level is reduced by 8 dB or 10.8%. The noise level is satisfactorily reduced. 展开更多
关键词 aerodynamic noise multi-forward-curved-blade centrifugal fan OPTIMIZATION response surface methodology
在线阅读 下载PDF
Grain crushing and its effects on rheological behavior of weathered granular soil
11
作者 陈晓斌 张家生 《Journal of Central South University》 SCIE EI CAS 2012年第7期2022-2028,共7页
To disclose the grain crushing effects on the weathered granular soil rheological behavior,a series of rheological tests (odometer compression and triaxial shearing) were carried out.At the same time,the sieving analy... To disclose the grain crushing effects on the weathered granular soil rheological behavior,a series of rheological tests (odometer compression and triaxial shearing) were carried out.At the same time,the sieving analysis tests of these specimens were also executed before and after tests,and the grain crushing degree,Br and n5,were collectively adopted to estimate the grain crushing.The grain crushing degree depends on the stress path,stress level,and load time,especially,the longer load time and more intensive gradient shearing path will increase the grain crushing quantity.The Hardin crushing degrees Br are 0.191,0.118 and 0.085 in the ordinary compression,rheological compression and triaxial rheological shearing,respectively;The grain crushing degrees n5 are 1.9,1.4 and 1.32,respectively.The strain softening phase indicates the grain crushing and diffusive collapse,and the strain hardening phase indicates the rearrangement of these crushed grains and formation of new bearing soil skeleton.The rheological deformation of granular soil can be attributed to the coarse grain crushing and the filling external porosity with crushed fragments. 展开更多
关键词 grain crushing degree rheological behavior weathered granular soil tri-axial rheological tests odometer compressiontest
在线阅读 下载PDF
Static aerobic composting of municipal sewage sludge with forced ventilation:Using matured compost as bulking conditioner 被引量:5
12
作者 欧阳建新 施周 +3 位作者 钟华 刘卫 柴琦 袁兴中 《Journal of Central South University》 SCIE EI CAS 2014年第1期303-309,共7页
Static aerobic composting of municipal sewage sludge with forced ventilation or air ventilation using matured compost as bulking conditioner was investigated. Physical and chemical parame ,eters, e.g., temperature, mo... Static aerobic composting of municipal sewage sludge with forced ventilation or air ventilation using matured compost as bulking conditioner was investigated. Physical and chemical parame ,eters, e.g., temperature, moisture content, VSS, CODcr, pH, and germination index (GI), were analyzed to characterize the composting process. Fermentation starts quickly in both forced and air ventilation compost heaps and reaches high-temperature stage after 2 d, owing to the bulking function of matured compost. Compared to air ventilation, however, forced ventilation enables the high-temperature stage to last longer for approximately 7 d. The moisture content of both compost bodies decreases from 62% to about 50% as a result of evaporation, and it decreases slightly faster in forced ventilation compost heap after 13 d due to the higher temperature and better ventilation condition. Although no obvious differences of VSS and pH are observed between both compost heaps, the soluble CODcr and GI show differences during the second half period of fermentation. In forced ventilation compost, the soluble CODcr has a small rebound after 13 d, and GI decreases from 46% to 35% but then increases. These results show that in general, the matured compost is a good conditioner and force ventilation with a proper air supply strategy can be more efficient than air ventilation. 展开更多
关键词 municipal sewage sludge static aerobic composting forced ventilation matured compost bulking conditioner
在线阅读 下载PDF
Parameter optimization for improved aerodynamic performance of louver-type wind barrier for train-bridge system 被引量:17
13
作者 HE Xu-hui FANG Dong-xu +1 位作者 LI Huan SHI Kang 《Journal of Central South University》 SCIE EI CAS CSCD 2019年第1期229-240,共12页
To improve the safety of trains running in an undesirable wind environment,a novel louver-type wind barrier is proposed and further studied in this research using a scaled wind tunnel simulation with 1:40 scale models... To improve the safety of trains running in an undesirable wind environment,a novel louver-type wind barrier is proposed and further studied in this research using a scaled wind tunnel simulation with 1:40 scale models.Based on the aerodynamic performance of the train-bridge system,the parameters of the louver-type wind barrier are optimized.Compared to the case without a wind barrier,it is apparent that the wind barrier improves the running safety of trains,since the maximum reduction of the moment coefficient of the train reaches 58%using the louver-type wind barrier,larger than that achieved with conventional wind barriers(fence-type and grid-type).A louver-type wind barrier has more blade layers,and the rotation angle of the adjustable blade of the louver-type wind barrier is 90–180°(which induces the flow towards the deck surface),which is more favorable for the aerodynamic performance of the train.Comparing the 60°,90°and 120°wind fairings of the louver-type wind barrier blade,the blunt fairing is disadvantageous to the operational safety of the train. 展开更多
关键词 wind barrier aerodynamic force train-bridge system scaled wind tunnel simulation parameter optimization
在线阅读 下载PDF
Wind response of high-rise building in diversified inlets to construct wind turbine system on roof
14
作者 YOU Ki-pyo YOU Jang-youl KIM Young-moon 《Journal of Central South University》 SCIE EI CAS 2014年第11期4395-4403,共9页
Many skyscrapers have installed wind turbine systems to use new renewable energy. In particular, building an integrated wind power generation system by installing a wind power generator inside a building is an attract... Many skyscrapers have installed wind turbine systems to use new renewable energy. In particular, building an integrated wind power generation system by installing a wind power generator inside a building is an attractive method to secure safe energy. However, most studies have dealt with the efficiency of wind turbines and the response effects of wind induced vibration; space preparation for wind turbine installations has not been sufficiently considered. This work reviewed the shapes of openings where wind turbines can be installed in skyscrapers, and the characteristics of wind induced vibration responses occurring in the building with changes in cross sectional area. Nine wind power models were constructed to carry out the experiment. According to the experimental results, wind speed varies with shape of opening in the order of C-type>S-type>R-type. Moreover, wind speed increases as the area is reduced. 展开更多
关键词 wind induced vibration tall building shapes of opening wind turbine
在线阅读 下载PDF
Impeller modeling and analysis based on UG NX/KF and Fluent 被引量:5
15
作者 王凌云 黄红辉 Rae W.West 《Journal of Central South University》 SCIE EI CAS 2012年第12期3430-3434,共5页
Parametric modeling of the impeller which drove a small wind device was built by knowledge fusion technology.NACA2410 airfoil blade was created by KF language.Using technology of UG/KF secondary development for the au... Parametric modeling of the impeller which drove a small wind device was built by knowledge fusion technology.NACA2410 airfoil blade was created by KF language.Using technology of UG/KF secondary development for the automatic modeling of wind turbine blade,the program can read in the airfoil data files automatically and the impeller model entity can be generated automatically.In order to modify the model,the aerodynamic characteristics of the impeller were analyzed for getting aerodynamic parameters by Fluent.The maximum force torch and best parameters of impeller were calculated.A physical prototype impeller was manufactured and the correctness of the design was verified,and the error of force torch between simulation and experimental results is about 10%.Parameterization design of the impeller model greatly improves the efficiency of modeling and flexibility of the CAD system. 展开更多
关键词 knowledge fusion airfoil wind turbine blade parametric design CAD/CAE
在线阅读 下载PDF
Undrained mechanical behavior of unsaturated completely weathered granite:Experimental investigation and constitutive modeling
16
作者 DU Shao-hua MA Jin-yin +2 位作者 RUAN Bo WU Gen-shui ZHANG Rui-chao 《Journal of Central South University》 2025年第6期2307-2327,共21页
The undrained mechanical behavior of unsaturated completely weathered granite(CWG)is highly susceptible to alterations in the hydraulic environment,particularly under uniaxial loading conditions,due to the unique natu... The undrained mechanical behavior of unsaturated completely weathered granite(CWG)is highly susceptible to alterations in the hydraulic environment,particularly under uniaxial loading conditions,due to the unique nature of this soil type.In this study,a series of unconfined compression tests were carried out on unsaturated CWG soil in an underground engineering site,and the effects of varying the environmental variables on the main undrained mechanical properties were analyzed.Based on the experimental results,a novel constitutive model was then established using the damage mechanics theory and the undetermined coefficient method.The results demonstrate that the curves of remolded CWG specimens with different moisture contents and dry densities exhibited diverse characteristics,including brittleness,significant softening,and ductility.As a typical indicator,the unconfined compression strength of soil specimens initially increased with an increase in moisture content and then decreased.Meanwhile,an optimal moisture content of approximately 10.5%could be observed,while a critical moisture content value of 13.0%was identified,beyond which the strength of the specimen decreases sharply.Moreover,the deformation and fracture of CWG specimens were predominantly caused by shear failure,and the ultimate failure modes were primarily influenced by moisture content rather than dry density.Furthermore,by comparing several similar models and the experimental data,the proposed model could accurately replicate the undrained mechanical characteristics of unsaturated CWG soil,and quantitatively describe the key mechanical indexes.These findings offer a valuable reference point for understanding the underlying mechanisms,anticipating potential risks,and implementing effective control measures in similar underground engineering projects. 展开更多
关键词 completely weathered granite undrained mechanical behavior environmental variable unconfined compression test constitutive model
在线阅读 下载PDF
Some studies on stochastic optimization based quantitative risk management
17
作者 HU Zhaolin 《运筹学学报(中英文)》 2025年第3期135-159,共25页
Risk management often plays an important role in decision making un-der uncertainty.In quantitative risk management,assessing and optimizing risk metrics requires eficient computing techniques and reliable theoretical... Risk management often plays an important role in decision making un-der uncertainty.In quantitative risk management,assessing and optimizing risk metrics requires eficient computing techniques and reliable theoretical guarantees.In this pa-per,we introduce several topics on quantitative risk management and review some of the recent studies and advancements on the topics.We consider several risk metrics and study decision models that involve the metrics,with a main focus on the related com-puting techniques and theoretical properties.We show that stochastic optimization,as a powerful tool,can be leveraged to effectively address these problems. 展开更多
关键词 stochastic optimization quantitative risk management risk measure computing technique statistical property
在线阅读 下载PDF
Optimization on Inlet Deflectors Structural Parameters of a Natural Draft Counter-flow Wet Cooling Tower
18
作者 HU Danmei ZONG Tao +1 位作者 ZHANG Zhichao ZHANG Jianping 《中国电机工程学报》 EI CSCD 北大核心 2013年第11期I0005-I0005,共1页
The cooling process of cooling water is veryimportant in power generation industry.The performanceof cooling towers has a great effect on security,stabilityand economy of power plants.The energy savingproblems of the ... The cooling process of cooling water is veryimportant in power generation industry.The performanceof cooling towers has a great effect on security,stabilityand economy of power plants.The energy savingproblems of the cooling tower have always beenneglected previously.With the aim of energy saving inthe power plants nowadays,improving the coolingefficiency of the cooling tower has important andpractical significance. 展开更多
关键词 cooling tower heat and mass transfer deflector numerical simulation optimization
在线阅读 下载PDF
上一页 1 下一页 到第
使用帮助 返回顶部