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Influence of cutterhead opening ratio on soil arching effect and face stability during tunnelling through non-uniform soils

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Underground Space 2024年第4期17卷 45-59页

作者： xue-jian chen Pei-Pei Fang Qiu-Nan chen Jun Hu Kai Yao Yong Liu State Key Laboratory of Water Resources Engineering and Management Wuhan UniversityWuhan 430072China Hubei Technology Innovation Center for Smart Hydropower Wuhan 430000China College of Civil Engineering Anhui Jianzhu UniversityHefei 230601China School of Civil Engineering Hunan University of Science and TechnologyXiangtan 411201China School of Civil and Architectural Engineering Hainan UniversityHaikou 570228China School of Qilu Transportation Shandong UniversityJinan 250002China

Tunnelling has increasingly become an essential tool in the exploration of underground space.A typical construction problem is the face instability during tunnelling,posing a great threat to associated *** face instability often occurs with the soil arching *** study investigates the combined effect of cutterhead opening ratio and soil non-uniformity on soil arching effect and face stability,via conducting random finite-element analysis coupled with Monte–Carlo *** results underscore that the face stability is strongly associated with the evolution of stress *** obtained stability factors in the uniform soils can serve as a reference for the design of support pressure in practical tunnelling *** addition,non-uniform soils exhibit a lower stability factor than uniform soils,which implies that the latter likely yields an underestimated probability of face *** tunnel face is found to have a probability of failure more than 50%if the spatial non-uniformity of soil is *** the end,a practical framework is established to determine factor of safety(FOS)corresponding to different levels of probability of face failure considering various opening ratios in non-uniform *** required FOS is 1.70 to limit the probability of face instability no more than 0.1%.Our findings can facilitate the prediction of probability of instability in the conventionally deterministic design of face pressure.

关键词： Tunnel Face stability Soil arching effect Cutterhead opening ratio Non-uniform soil Random field

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LaMnO_(3)/Co_(3)O_(4) nanocomposite for enhanced triethylamine sensing properties

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Journal of Rare Earths 2024年第4期42卷 733-742页

作者： jian Zhang Yanping chen Ling Li xue chen Wenya An Xiujuan Qian Yuye Tao School of Science Shandong Jianzhu UniversityJinan250100China

LaMnO_(3) modified Co_(3)O_(4) nanocomposites were prepared by simple hydrothermal method co mbined with sol-gel *** gas sensitivity properties of pure Co_(3)O_(4) and LaMnO_(3)/Co_(3)O_(4) with different composite proportions are *** is found that 0.6-LMO/Co_(3)O_(4) sensor has higher sensitivity to triethylamine(TEA)than pure Co_(3)O_(4) sensor,which is improved by 9.27 *** the working temperature is reduced from 150 to 130℃.Besides,it has excellent gas selectivity and *** improvement of the gas sensitivity of LaMnO_(3)/Co_(3)O_(4) sensor may be due to the fact that LaMnO_(3) is an effective catalyst,and the catalytic performance perhaps is beneficial to improving the sensing *** addition,the formation of p-p heterojunctions may be the key factor to improve the gas sensing *** work provides a new Co_(3)O_(4)-based gas sensing material for the detection of TEA.

关键词： Gas sensing Co_(3)O_(4) LaMnO_(3) Triethylamine Rareearths

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Comparative proteomics analysis of human gastric cancer

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World Journal of Gastroenterology 2008年第37期14卷 5657-5664页

作者： Wei Li jian-Fang Li Ying Qu xue-Hua chen jian-Min Qin Qin-Long Gu Min Yan Zheng-Gang Zhu Bing-Ya liu Shanghai Key Laboratory of Diagnosis and Treatment for GastrointestinalCancer Department of Surgery Shanghai Institute of DigestiveSurgery Ruijin Hospital Shanghai Jiao Tong University Schoolof Medicine Shanghai 200025 China

AIM: To isolate and identify differentially expressed proteins between cancer and normal tissues of gastric cancer by two-dimensional electrophoresis (2-DE) and matrix-assisted laser desorption/ionization time-of-flight mass spectrometry (MALDI-TOF-MS). METHODS: Soluble fraction proteins of gastric cancer tissues and paired normal tissues were separated by 2-DE. The differentially expressed proteins were selected and identified by MALDI-TOF-MS and database search. RESULTS: 2-DE profiles with high resolution and reproducibility were obtained. Twenty-three protein spots were excised from sliver staining gel and digested in gel by trypsin, in which fifteen protein spots were identified successfully. Among the identified proteins, there were ten over-expressed and five under-expressed proteins in stomach cancer tissues compared with normal tissues. CONCLUSION: In this study, the well-resolved, reproducible 2-DE patterns of human gastric cancer tissue and paired normal tissue were established and optimized and certain differentially-expressed proteins were identified. The combined use of 2-DE and MS provides an effective approach to screen for potential tumor markers.

关键词： Proteome Two-dimensional polyacrylamide gel electrophoresis Mass spectrometry Gastric cancer Tumor markers

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Free Vibration of Stiffened Plate with Cracked Stiffeners

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Advances in Applied Mathematics and Mechanics 2024年第1期16卷 253-278页

作者： jian xue Lihua chen Yue Sun Wei Zhang Faculty of Materials and Manufacturing Beijing University of TechnologyBeijing 100124China Department of Mechanics School of ScienceHarbin Institute of TechnologyShenzhenGuangdong 518055China Institute of Textiles and Clothing The Hong Kong Polytechnic UniversityHong KongChina

In this paper,a new cracked stiffener model for the stiffener with a partthrough and open crack is proposed,considering the compatibility condition of displacements between the plate and the *** on the first-order shear deformation theory,the free vibration of stiffened isotropic plates with cracked stiffeners are investigated for the first *** description of the crack parameters is based on the continuous equivalent bending stiffness and equivalent depth of the cracked beam,and it takes into consideration of shear deformation,bending-extensional coupling vibration,and eccentricity between the stiffeners and the *** stiffened plates with single or multiple cracked stiffeners are formulated and *** Ritz method with the modified characteristic functions is applied to demonstrate the effects of crack parameters(crack depth and location)coupling with the position and number of the cracked stiffeners on the vibration frequencies and modes of the stiffened *** validity and accuracy of the present solutions are verified through convergence studies and compared with the finite element results.

关键词： Free vibration stiffened plate cracked stiffener model crack Ritz method

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基于3D-FLAIR MRI检查评估突发性聋患者耳聋分级、分型及预后的关系研究

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中国CT和MRI杂志 2024年第5期22卷 55-57页

作者：赵志光李萌萌李晓兰薛建琛张家口市第二医院CT室河北张家口075000

目的探究基于磁共振三维快速液体衰减反转恢复序列(3D-FLAIR MRI)检查评估突发性聋(ISNHL)患者耳聋分级、分型及预后的关系研究。方法选择2020年4月至2023年4月来我院就诊的突发性耳聋(ISNHL)患者328例,患者均行3D-FLAIR MRI检测。收集... 详细信息

目的探究基于磁共振三维快速液体衰减反转恢复序列(3D-FLAIR MRI)检查评估突发性聋(ISNHL)患者耳聋分级、分型及预后的关系研究。方法选择2020年4月至2023年4月来我院就诊的突发性耳聋(ISNHL)患者328例,患者均行3D-FLAIR MRI检测。收集受试者的一般资料及影像学结果,根据患者的高信号区变化情况分为A组196例(内耳正常、无异常信号显示)、B组73例(表现为高信号吸收)及C组59例(表现高信号未吸收),记录三组受试者的耳聋分级、分型,并进行针对性治疗分析三组预后情况。结果三组的性别、年龄、病程比较,差异无统计学意义(P>0.05),三组的伴随头晕/眩晕、前庭功能异常比例及治疗天数比较,差异有统计学意义(P0.05),A组的痊愈高于B组及C组(P<0.05)。结论3D-FLAIR MRI检查能够有助于临床判断ISNHL患者耳聋分级、分型,并与预后关系密切。

关键词：突发性聋磁共振成像三维快速液体衰减反转恢复序列耳聋分级预后

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MADRL-based UAV swarm non-cooperative game under incomplete information

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Chinese Journal of Aeronautics 2024年第6期37卷 293-306页

作者： Ershen WANG Fan LIU chen HONG Jing GUO Lin ZHAO jian xue Ning HE School of Electronic and Information Engineering Shenyang Aerospace UniversityShenyang 110136China College of Robotics Beijing Union UniversityBeijing 100101China School of Engineering Science University of Chinese Academy of SciencesBeijing 100049China College of Smart City Beijing Union UniversityBeijing 100101China

Unmanned Aerial Vehicles(UAVs)play increasing important role in modern *** this paper,considering the incomplete observation information of individual UAV in complex combat environment,we put forward an UAV swarm non-cooperative game model based on Multi-Agent Deep Reinforcement Learning(MADRL),where the state space and action space are constructed to adapt the real features of UAV swarm air-to-air *** multi-agent particle environment is employed to generate an UAV combat scene with continuous observation *** recently popular MADRL methods are compared extensively in the UAV swarm noncooperative game model,the results indicate that the performance of Multi-Agent Soft Actor-Critic(MASAC)is better than that of other MADRL methods by a large *** swarm employing MASAC can learn more effective policies,and obtain much higher hit rate and win *** under different swarm sizes and UAV physical parameters are also performed,which implies that MASAC owns a well generalization ***,the practicability and convergence of MASAC are addressed by investigating the loss value of Q-value networks with respect to individual UAV,the results demonstrate that MASAC is of good practicability and the Nash equilibrium of the UAV swarm non-cooperative game under incomplete information can be reached.

关键词： UAV swarm Reinforcement learning Deep learning Multi-agent Non-cooperative game Nash equilibrium

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Nano-alumina@cellulose-coated separators with the reinforcedconcrete-like structure for high-safety lithium-ion batteries

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Chinese Journal of Chemical Engineering 2024年第4期68卷 83-93页

作者： Zhihao Yang Li chen jian xue Miaomiao Su Fangdan Zhang Liangxin Ding Suqing Wang Haihui Wang Guangdong Provincial Key Lab of Green Chemical Product Technology School of Chemistry and Chemical EngineeringSouth China University of TechnologyGuangzhou 510640China Beijing Key Laboratory of Membrane Materials and Engineering Department of Chemical EngineeringTsinghua UniversityBeijing 100084China

Separators play a critical role in the safety and performance of lithium-ion ***,commercial polyolefin separators are limited by their poor affinity with electrolytes and low melting *** this work,we constructed a reinforced-concrete-like structure by homogeneously dispersing nano-Al_(2)O_(3) and cellulose on the separators to improve their stability and *** this reinforcedconcrete-like structure,the cellulose is a reinforcing mesh,and the nano-Al_(2)O_(3) acts as concrete to support the *** constructing the reinforced-concrete-like structure,the separators exhibit good stability even at 200℃(thermal shrinkage of 0.3%),enhanced tensile strain(tensile stress of 133.4 MPa and tensile strains of 62%),and better electrolyte wettability(a contact angle of 6.5°).Combining these advantages,the cells with nano-Al_(2)O_(3)@cellulose-coated separators exhibit stable cycling performance and good rate ***,the construction of the reinforced-concretelike structure is a promising technology to promote the application of lithium-ion batteries in extreme environments.

关键词： Alumina Nanomaterials Lithium-ion batteries Membranes Cellulose Reinforced-concrete-like structure

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Persymmetric adaptive polarimetric detection of subspace range-spread targets in compound Gaussian sea clutter

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Journal of Systems Engineering and Electronics 2024年第1期35卷 31-42页

作者： XU Shuwen HAO Yifan WANG Zhuo xue jian National Key Laboratory of Radar Signal Processing Xidian UniversityXi’an 710071China Xi’an Electronic Engineering Research Institute Xi’an 710100China Beijing Institute of Radio Measurement Beijing 100039China School of Communications and Information Engineering Xi’an University of Posts and TelecommunicationsXi’an 710121China

This paper focuses on the adaptive detection of range and Doppler dual-spread targets in non-homogeneous and nonGaussian sea *** sea clutter from two polarimetric channels is modeled as a compound-Gaussian model with different parameters,and the target is modeled as a subspace rangespread target *** persymmetric structure is used to model the clutter covariance matrix,in order to reduce the reliance on secondary data of the designed *** adaptive polarimetric persymmetric detectors are designed based on the generalized likelihood ratio test(GLRT),Rao test,and Wald *** the proposed detectors have constant falsealarm rate property with respect to the clutter texture,the speckle covariance *** results on simulated and measured data show that three adaptive detectors outperform the competitors in different clutter environments,and the proposed GLRT detector has the best detection performance under different parameters.

关键词： sea clutter adaptive polarimetric detection compound Gaussian model subspace range-spread target persymmetric structure

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三维快速液体衰减反转恢复序列(3D-FLAIR)在突发性耳聋临床诊断中的应用价值分析

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中国CT和MRI杂志 2024年第8期22卷 23-25页

作者：赵志光李晓旭李萌萌李晓兰薛建琛张家口市第二医院CT室河北张家口075000 张家口市第五医院急诊科河北张家口075051

目的分析三维快速液体衰减反转恢复序列(3D-FLAIR)在突发性耳聋(SD)临床诊断中的应用价值。方法选取2022年5月-2023年5月我院收治的84例SD患者为研究对象,所有患者均接受3D-FLAIR检查及常规实验室检查[纯音听阈测试、耳蜗电图、前庭诱... 详细信息

目的分析三维快速液体衰减反转恢复序列(3D-FLAIR)在突发性耳聋(SD)临床诊断中的应用价值。方法选取2022年5月-2023年5月我院收治的84例SD患者为研究对象,所有患者均接受3D-FLAIR检查及常规实验室检查[纯音听阈测试、耳蜗电图、前庭诱发肌源性电位(VEMP)等],依据3D-FLAIR检查结果分为内耳正常组和内耳异常组,其中内耳异常组包括内耳异常A组(血迷路屏障渗出)和内耳异常B组(血迷路屏障破坏),探究3D-FLAIR在SD临床诊断中的应用价值,并分析SD患者不同3D-FLAIR检查结果的听力损失情况、前庭功能损伤情况及疗效分布情况。结果耳蜗电图、VEMP及3D-FLAIR检查对SD患者内耳异常检查的阳性率差异有统计学意义(P0.05),听力曲线类型分布差异有统计学意义(P<0.05)。84例SD患者中,VEMP显示异常有62例(73.81%),HIT显示异常有29例(34.52%),VAT显示异常60例(71.43%),冷热试验显示异常有54例(64.29%);3组间VEMP、VAT及冷热试验异常分布比较差异均有统计学意义(P<0.05)。84例SD患者中,痊愈12例(14.29%),显效19例(22.62%),有效20例(23.81%),无效33例(39.28%);3组间疗效分布差异有统计学意义(P<0.05)。结论3D-FLAIR有助于了解SD患者内耳病理状态,对内耳异常有更高检出率,可用于SD的辅助诊断以提高治疗方案的有效性。

关键词：三维快速液体衰减反转恢复序列突发性耳聋磁共振成像纯音听阈测试耳蜗电图

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三维快速液体衰减反转恢复序列(3D-FLAIR)在突发性耳聋临床诊断中的应用价值分析

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中国CT和MRI杂志 2024年第9期22卷 35-37页

作者：赵志光李晓旭李萌萌李晓兰薛建琛张家口市第二医院CT室河北张家口075000 张家口市第五医院急诊科河北张家口075051

关键词：三维快速液体衰减反转恢复序列突发性耳聋磁共振成像纯音听阈测试耳蜗电图

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