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Stability analysis of gravity anchor foundation of layered argillaceous sandstone under dry-wet cycles

Journal of Mountain Science 2023年第4期20卷 1118-1130页

作者： zheng jing-cheng CHEN Wei zheng Ke-ren GU Yu-peng WANG Fei HUANG Zhen LI Yun School of Civil Engineering Central South UniversityChangsha410075China The 8th Engineering Co. LTDChina Railway Major Bridge Engineering Group Co.LTD.Chongqing400026China Key Laboratory of Ministry of Education on Safe Mining of Deep Metal Mines Northeastern UniversityShenyang110819China College of Civil Engineering and Architecture Key Laboratory of Disaster Prevention and Structural SafetyGuangxi UniversityNanning530004China

To investigate the stability of gravity anchors of suspension bridges,in-situ tests of the vertical bearing capacity of the bedrock,shear resistance of the anchor-rock interface,shear resistance of the bedrock were conducted in a suspension bridge *** dry-wet cycles,the deterioration law of the mechanical properties of argillaceous sandstone was identified in laboratory tests:the elastic modulus,cohesion and friction of the argillaceous sandstone deteriorated significantly at first few dry-wet cycles and then declined slowly after 10 cycles,ultimately these three mechanical parameters were reduced to about 1/3,1/3,2/3 of the initial value ***,numerical simulation was used to restore in-situ shear tests and a good agreement was *** on the results of in-situ and laboratory tests,the stability of the gravity anchor foundation under natural conditions and drywet cycles was calculated and its failure modes were *** results demonstrated that the dry-wet cycles caused uneven settlement of the anchor foundation,resulting in more serious stress concentration in the *** dry-wet cycles remarkably reduced the stability coefficient of the anchor foundation,whose failure mode shifted from overturning failure under natural conditions to sliding *** there was weak interlayer in the rock layer,the anti-sliding stability of the anchor foundation was affected drastically.

关键词： Gravity anchor foundation Stability In-situ tests Dry-wet cycles Numerical simulation

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酶法水解棉籽蛋白的研究

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中国油脂 2007年第8期32卷 38-40页

作者：郭城郑竟成武汉工业学院食品科学与工程学院

采用pH-stat法测定水解度,探讨了两种蛋白酶分步水解棉籽蛋白的反应条件和影响因素。实验结果表明,先使用碱性蛋白酶Alcalase,在酶加量为750 U/g、水解温度60℃、底物浓度5%、pH为8的条件下水解300 min;灭酶后再加入中性蛋白酶AS1.398,... 详细信息

采用pH-stat法测定水解度,探讨了两种蛋白酶分步水解棉籽蛋白的反应条件和影响因素。实验结果表明,先使用碱性蛋白酶Alcalase,在酶加量为750 U/g、水解温度60℃、底物浓度5%、pH为8的条件下水解300 min;灭酶后再加入中性蛋白酶AS1.398,在酶加量8 000 U/g、水解温度60℃、pH为7的条件下再水解100 min;两种酶的最终水解度达到20.08%。

关键词：棉籽蛋白酶解水解度

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容积式凸轮泵的设计与应用

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中国油脂 2007年第5期32卷 65-67页

作者：唐善华郑竟成武汉工业学院机械工程系武汉工业学院食品学院武汉市430023

阐述了容积式凸轮泵的工作原理与结构特点,分析了其转子廓线、轴封及同步传动齿轮的无键联接等几个关键问题的设计思想和注意事项,介绍了凸轮泵在油脂行业的使用范围及应用前景。

关键词：凸轮泵容积式机械密封

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Intermolecular reductive coupling of aliphatic ketones with alkynes and alkenes by BCN photocatalysts

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Science China Chemistry 2025年第1期68卷 181-185页

作者： Yanping Xia Luyang Sun Jiajia cheng Sibo Wang Meifang zheng Xinchen Wang State Key Laboratory of Photocatalysis on Energy and Environment College of Chemistry Fuzhou University

A photocatalytic process was developed for intermolecular reductive coupling of aliphatic ketones with alkynes/alkenes to furnish tertiary alcohols. Mechanistic studies support that boron carbonitrides(BCN) promote the single electron reduction of unactivated aliphatic ketones to generate ketyl radicals with visible light irradiation, which then react with alkynes and alkenes to afford the allylic and aliphatic alcohols, respectively. The heterogeneous photocatalytic system is compatible with diverse substrates including pharmaceutical-related molecules(43 examples) with reusability and scale-up experiments, verifying the complementary synthetic utility of this method to the homogeneous catalysts.

关键词： aliphatic ketones ketyl radical intermolecular cross-coupling tertiary alcohols

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Merging polymers of intrinsic microporosity and porous carbon-based zinc oxide composites in novel mixed matrix membranes for efficient gas separation

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Green Energy & Environment 2025年第1期10卷 203-213页

作者： Muning Chen Jiemei Zhou jing Ma Weigang zheng Guanying Dong Xin Li Zhihong Tian Yatao Zhang jing Wang Yong Wang School of Chemical Engineering Zhengzhou UniversityZhengzhou450001HenanChina State Key Laboratory of Materials-Oriented Chemical Engineering and College of Chemical Engineering Nanjing Tech UniversityNanjing211816JiangsuChina Singapore Membrane Technology Centre Nanyang Environment and Water Research InstituteNanyang Technological UniversitySingapore637141Singapore Engineering Research Center for Nanomaterials Henan UniversityKaifeng475004HenanChina State Key Laboratory of Coking Coal Resources Green Exploitation Zhengzhou UniversityZhengzhou 450001China School of Energy and Environment Southeast UniversityNanjing210096JiangsuChina

Mixed matrix membranes(MMMs)have demonstrated significant promise in energy-intensive gas separations by amalgamating the unique properties of fillers with the facile processability of ***,achieving a simultaneous enhancement of permeability and selectivity remains a formidable challenge,due to the difficulty of achieving an optimal match between polymers and *** this study,we incorporate a porous carbon-based zinc oxide composite(C@ZnO)into high-permeability polymers of intrinsic microporosity(PIMs)to fabricate *** dipole–dipole interaction between C@ZnO and PIMs ensures their exceptional compatibility,mitigating the formation of non-selective voids in the resulting ***,C@ZnO with abundant interconnected pores can provide additional low-resistance pathways for gas transport in *** a result,the CO_(2) permeability of the optimized C@ZnO/PIM-1 MMMs is elevated to 13,215 barrer,while the CO_(2)/N_(2) and CO_(2)/CH4 selectivity reached 21.5 and 14.4,respectively,substantially surpassing the 2008 Robeson upper ***,molecular simulation results further corroborate that the augmented membrane gas selectivity is attributed to the superior CO_(2) affinity of C@*** summary,we believe that this work not only expands the application of MMMs for gas separation but also heralds a paradigm shift in the application of porous carbon materials.

关键词： Mixed matrix membranes Polymers of intrinsic microporosity CO_(2)separation Porous carbon materials

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Unraveling the impacts of intermolecular interaction on morphology evolution for highly efficient organic solar cells and modules

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Science China Chemistry 2025年第1期68卷 264-272页

作者： Xueqing Ma Yingying cheng Yuqiang Liu Xinming zheng Guangliu Ran Hongxiang Li Xinyue Cui Andong Zhang Wenkai Zhang Pei cheng Wenchao Huang Zhishan Bo Beijing Key Laboratory of Energy Conversion and Storage Materials College of Chemistry Beijing Normal University College of Textiles and Clothing State Key Laboratory of Bio-fibers and Eco-textiles Qingdao University Key State Laboratory of Advanced Technology for Materials Synthesis and Processing School of Materials Science and EngineeringWuhan University of Technology Department of Physics and Applied Optics Beijing Area Major Laboratory Center for Advanced Quantum Studies Beijing Normal University State Key Laboratory of Polymer Materials Engineering College of Polymer Science and Engineering Sichuan University

Understanding the effect of intermolecular interaction on the growth dynamic of active layers is critical for advancing organic solar cells(OSCs). However, the diverse structure of donors and acceptors makes the research challenging. Additives with customizable structures and properties could simplify this complexity. Herein, we meticulously tailor two additives of 3,4-ethylenedioxythiophene(EDOT) and 2,5-dibromo-3,4-ethylenedioxythiophene(DBEDOT), possessing distinct intermolecular interaction features to elaborate the inherent relationship. It is found that varied interaction strengths can alter film formation processes. The enhanced intermolecular interaction between the DBEDOT and non-fullerene acceptor BTP-e C9-4F results in pre-aggregation and longer crystallization duration of BTP-e C9-4F, facilitating the formation of films with compact molecular packing and decent phase separation. Thus, exciton dissociation and charge transport become more efficient. Finally, devices processed with DBEDOT exhibit a remarkable power conversion efficiency of 19.35% in small-area OSCs and 14.11% in bladecoated 5 cm × 5 cm organic solar mini-modules. Especially, OSCs can maintain 80% of their initial efficiency after continuous annealing at 85 °C for over 2,100 h.

关键词： organic solar cell non-fullerene acceptor film growth molecular packing intermolecular interaction

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Spontaneous Orientation Polarization of Anisotropic Equivalent Dipoles Harnessed by Entropy Engineering for Ultra‑Thin Electromagnetic Wave Absorber

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Nano-Micro Letters 2025年第1期17卷 424-438页

作者： Honghan Wang Xinyu Xiao Shangru Zhai Chuang Xue Guangping zheng Deqing Zhang Renchao Che Junye cheng Liaoning Key Lab of Lignocellulose Chemistry and BioMaterials Liaoning Collaborative Innovation Center for Lignocellulosic BiorefinerySchool of Light Industry and Chemical EngineeringDalian Polytechnic UniversityDalian 116034People’s Republic of China School of Life Science and Biotechnology Dalian University of TechnologyDalian 116024People’s Republic of China Department of Mechanical Engineering Hong Kong Polytechnic UniversityHung HomKowloonHong Kong 999077People’s Republic of China School of Materials Science and Engineering Qiqihar UniversityQiqihar 161006People’s Republic of China Laboratory of Advanced Materials Shanghai Key Lab of Molecular Catalysis and Innovative MaterialsAcademy for Engineering&TechnologyFudan UniversityShanghai 200438People’s Republic of China Department of Materials Science Shenzhen MSU-BIT UniversityShenzhen 517182People’s Republic of China

The synthesis of carbon supporter/nanoscale high-entropy alloys(HEAs)electromagnetic response composites by carbothermal shock method has been identified as an advanced strategy for the collaborative competition engineering of conductive/dielectric *** migration modes within HEAs as manipulated by the electronegativity,valence electron configurations and molar proportions of constituent elements determine the steady state and efficiency of equivalent ***,enlightened by skin-like effect,a reformative carbothermal shock method using carbonized cellulose paper(CCP)as carbon supporter is used to preserve the oxygencontaining functional groups(O·)of carbonized cellulose fibers(CCF).Nucleation of HEAs and construction of emblematic shell-core CCF/HEAs heterointerfaces are inextricably linked to carbon metabolism induced by O·.Meanwhile,the electron migration mode of switchable electronrich sites promotes the orientation polarization of anisotropic equivalent *** virtue of the reinforcement strategy,CCP/HEAs composite prepared by 35%molar ratio of Mn element(CCP/HEAs-Mn_(2.15))achieves efficient electromagnetic wave(EMW)absorption of−51.35 dB at an ultra-thin thickness of 1.03 *** mechanisms of the resulting dielectric properties of HEAs-based EMW absorbing materials are elucidated by combining theoretical calculations with experimental characterizations,which provide theoretical bases and feasible strategies for the simulation and practical application of electromagnetic functional devices(e.g.,ultra-wideband bandpass filter).

关键词： High-entropy alloys Carbothermal shock Switchable electron migration modes Emblematic shell-core heterointerfaces Ultra-thin thickness

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Progress of research in the application of ultrasound technology for the treatment of Alzheimer’s disease

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Neural Regeneration Research 2025年第10期20卷 2823-2837页

作者： Qiuquan Cai Lianghui Meng Meina Quan Ling Wang jing Ren chenguang zheng Jiajia Yang Dong Ming Academy of Medical Engineering and Translational Medicine Tianjin UniversityTianjinChina Innovation Center for Neurological Disorders Xuanwu HospitalCapital Medical UniversityBeijingChina Brain-Computer Interaction and Human-Machine Fusion Haihe Laboratory Tianjin UniversityTianjinChina Tianjin Key Laboratory of Brain Science and Neural Engineering Tianjin UniversityTianjinChina

Alzheimer’s disease is a common neurodegenerative disorder defined by decreased reasoning abilities,memory loss,and cognitive *** presence of the blood-brain barrier presents a major obstacle to the development of effective drug therapies for Alzheimer’s *** use of ultrasound as a novel physical modulation approach has garnered widespread attention in recent *** a safe and feasible therapeutic and drug-delivery method,ultrasound has shown promise in improving cognitive *** article provides a summary of the application of ultrasound technology for treating Alzheimer’s disease over the past 5 years,including standalone ultrasound treatment,ultrasound combined with microbubbles or drug therapy,and magnetic resonance imaging-guided focused ultrasound *** is placed on the benefits of introducing these treatment methods and their potential *** found that several ultrasound methods can open the blood-brain barrier and effectively alleviate amyloid-βplaque *** believe that ultrasound is an effective therapy for Alzheimer’s disease,and this review provides a theoretical basis for future ultrasound treatment methods.

关键词： Alzheimer’s disease blood-brain barrier drugs magnetic resonance imaging-guided focused ultrasound microbubbles scanning ultrasound ultrasound ultrasound stimulation

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响应面法优化花生蛋白酸奶的加工工艺

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粮食与油脂 2021年第6期34卷 96-100,104页

作者：秦朗曹健田华郑竟成武汉轻工大学食品科学与工程学院湖北武汉430023

以低温花生蛋白粉和牛奶为主要原料,添加其他辅料发酵制成花生蛋白酸奶。在单因素试验基础上,进行Plackett-Burman Design设计,对影响花生蛋白酸奶品质的6个因素以感官评分值为指标进行筛选,选出对其影响显著的3个因素进行Box-Behnken... 详细信息

以低温花生蛋白粉和牛奶为主要原料,添加其他辅料发酵制成花生蛋白酸奶。在单因素试验基础上,进行Plackett-Burman Design设计,对影响花生蛋白酸奶品质的6个因素以感官评分值为指标进行筛选,选出对其影响显著的3个因素进行Box-Behnken响应面试验,对花生蛋白酸奶的加工工艺进行优化。所得花生蛋白酸奶的最佳加工工艺条件:以花生蛋白粉和水的总质量为基准,花生蛋白粉与水比例为1∶9.4 (g/m L)、牛奶添加量15%、乳清蛋白粉添加量2%、白砂糖添加量10%、发酵剂添加量3%、发酵时间7.4 h。

关键词：花生蛋白加工工艺酸奶响应面

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富水强风化砂岩地层顶管隧道下穿既有铁路施工技术

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科学技术与工程 2023年第29期23卷 12714-12720页

作者：潘鹏旭陈伟郑京承长沙铁路勘察设计有限公司长沙410000 中南大学土木工程学院长沙410075

为了解隧道下穿富水强风化砂岩地层施工对既有铁路的影响,依托某电缆隧道下穿广深铁路工程,通过理论分析、数值模拟与现场监测开展了相关研究,并分析了具体施工措施对隧道及地表变形控制的影响。结果表明:当不考虑地表列车荷载和地层富... 详细信息

为了解隧道下穿富水强风化砂岩地层施工对既有铁路的影响,依托某电缆隧道下穿广深铁路工程,通过理论分析、数值模拟与现场监测开展了相关研究,并分析了具体施工措施对隧道及地表变形控制的影响。结果表明:当不考虑地表列车荷载和地层富水时,开挖及顶进力为地表沉降、隧道变形的主要影响因素;当单独考虑列车荷载或地层富水弱化作用时,列车荷载会使得下穿段地表沉降和隧道拱顶沉降增大,而地层富水弱化对隧道进出口段沉降及下穿段底部隆起影响较大;当同时考虑列车荷载和地层富水时,隧道拱顶沉降及下穿段路基沉降均会大幅增加。对比分析现场监测、Peck公式预测和数值模拟计算结果,可知数值模拟结果与不考虑地层富水弱化时的Peck公式预测结果十分吻合,但由于其未考虑加固止水措施,地表沉降大于现场监测结果。电缆隧道下穿广深铁路现场施工严格执行现场监测和变形控制措施,将地表沉降值和隧道拱顶沉降值分别控制在6 mm和10 mm之内,隧道底部隆起控制在5 mm以下,可以保障项目的顺利实施与列车的运行安全,并为同类型工程提供一定的经验参考。

关键词：富水强风化砂层顶管隧道 Peck公式下穿铁路列车荷载

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