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INTERDIFFUSION KINETICS OF MISCIBLE POLYMER/POLYMER LAMINATES INVESTIGATED BY ATOMIC FORCE MICROSCOPY

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Chinese Journal of Polymer Science 2013年第6期31卷 870-878页

作者： Yong-gui Liao meng-jun Peng Feng-zhen Liu 解孝林 Key Laboratory for Large-Format Battery Materials and System Ministry of Education School of Chemistry and Chemical Engineering Huazhong University of Science and Technology Wuhan National High Magnetic Field Center Huazhong University of Science and Technology

The miscibility of poly（vinyl chloride）/poly（n-butyl methacrylate）（PVC/PnBMA） blend and the interdiffusion kinetics of PVC/PnBMA laminates have been investigated by differential scanning calorimetry （DSC） and atomic force microscopy （AFM）, respectively. This blend exhibited a lower critical solution temperature behavior. Below 120 ℃, DSC results showed each blend with different PVC contents exhibited only a single glass transition temperature which increased with PVC content, indicating that PVC and PnBMA were miscible. After PVC/PnBMA laminates were annealed at different temperature for different time, a smooth cross-section across interface was prepared by ultramicrotoming. Combined with topography and phase images of tapping mode AFM, the relative concentration profile, interface width and the relationship between interface width and annealing time could be obtained. In a regime of rubbery/rubbery interdiffusion, the diffusion obeyed a typical Fickian Case-I behavior where the interface width was proportional to the square root of annealing time. The mutual diffusion coefficient was in good agreement with that obtained from DSC and positron annihilation lifetime spectroscopy. However, in the regime of glassy/rubbery interdiffusion, the diffusion followed a typical Case-II behavior where the interface width was proportional to annealing time. These results imply that AFM is a reliable and powerful tool for the investigation of polymer/polymer interdiffusion at a level of polymer chain size.

关键词： Miscibility Polymer interface Interdiffusion Kinetics Atomic force microscopy.

Characteristics of loess landslides triggered by different factors in the Chinese Loess Plateau

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Journal of Mountain Science 2021年第12期18卷 3218-3229页

作者： meng zhen-jiang MA Peng-hui PENG Jian-bing Infrastructure Department Chang'an UniversityXi’an 710054China College of Geological Engineering and Surveying of Chang'an University Xi’an 710054China Key Laboratory of Western China Mineral Resources and Geological Engineering Xi’an 710054China

Loess landslides are one of the most serious geological disasters in the Chinese Loess *** has revealed that earthquake,rainfall,and human activities are common triggers for loess *** order to study the relationship and characteristics of these landslides triggered by different factors,the paper uses historic landslide data to expound the basic motion indices of landslides triggered by different *** than half of loess landslides occurred on concave surface slopes,while nearly 40%of the loess landslides occurred on convex surface *** activities have a great effect on the occurrence of landslides,and the distribution density of landslides on residential land was almost five times that of bare ***,earthquakeinduced loess landslides had the largest sliding volume,whereas the excavation-induced loess landslide had the smallest sliding *** sliding volume of irrigation-induced and rainfall-induced loess landslides were between earthquake-induced loess landslides and excavation-induced loess *** of loess landslides were induced by a combination of these factors,such as rainfall and excavation,irrigation and *** a model that described the impact of these factors on the loess landslides was proposed.

关键词： Loess Plateau Landslides Multiple sliding Loess disaster chain Distribution characteristics

Characteristic changes in astrocyte properties during astrocyte-to-neuron conversion induced by NeuroD1/Ascl1/Dlx2

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Neural Regeneration Research 2025年第6期20卷 1801-1815页

作者： Qing He zhen Wang Yuchen Wang mengjie Zhu Zhile Liang Kanghong Zhang Yuge Xu Gong Chen GHM Institute of CNS Regeneration Jinan UniversityGuangzhouGuangdong ProvinceChina

Direct in vivo conversion of astrocytes into functional new neurons induced by neural transcription factors has been recognized as a potential new therapeutic intervention for neural injury and degenerative disorders. However, a few recent studies have claimed that neural transcription factors cannot convert astrocytes into neurons, attributing the converted neurons to pre-existing neurons mis-expressing transgenes. In this study, we overexpressed three distinct neural transcription factors––NeuroD1, Ascl1, and Dlx2––in reactive astrocytes in mouse cortices subjected to stab injury, resulting in a series of significant changes in astrocyte properties. Initially, the three neural transcription factors were exclusively expressed in the nuclei of astrocytes. Over time, however, these astrocytes gradually adopted neuronal morphology, and the neural transcription factors was gradually observed in the nuclei of neuron-like cells instead of astrocytes. Furthermore,we noted that transcription factor-infected astrocytes showed a progressive decrease in the expression of astrocytic markers AQP4(astrocyte endfeet signal), CX43(gap junction signal), and S100β. Importantly, none of these changes could be attributed to transgene leakage into preexisting neurons. Therefore, our findings suggest that neural transcription factors such as NeuroD1, Ascl1, and Dlx2 can effectively convert reactive astrocytes into neurons in the adult mammalian brain.

关键词： aquaporin-4 Ascl1 astrocyte cortex Dlx2 gap junction glia-to-neuron conversion neural regeneration NeuroD1 reprogramming

Optimizing electronic structure through point defect engineering for enhanced electrocatalytic energy conversion

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Green Energy & Environment 2025年第1期10卷 109-131页

作者： Wei Ma Jiahao Yao Fang Xie Xinqi Wang Hao Wan Xiangjian Shen Lili Zhang menggai Jiao zhen Zhou Interdisciplinary Research Center for Sustainable Energy Science and Engineering(IRC4SE2) School of Chemical EngineeringZhengzhou UniversityHenan450001China

Point defect engineering endows catalysts with novel physical and chemical properties,elevating their electrocatalytic *** introduction of defects emerges as a promising strategy,effectively modifying the electronic structure of active *** optimization influences the adsorption energy of intermediates,thereby mitigating reaction energy barriers,altering paths,enhancing selectivity,and ultimately improving the catalytic efficiency of *** elucidate the impact of defects on the electrocatalytic process,we comprehensively outline the roles of various point defects,their synthetic methodologies,and characterization ***,we consolidate insights into the relationship between point defects and catalytic activity for hydrogen/oxygen evolution and CO_(2)/O_(2)/N_(2) reduction reactions by integrating mechanisms from diverse *** underscores the pivotal role of point defects in enhancing catalytic *** last,the principal challenges and prospects associated with point defects in current electrocatalysts are proposed,emphasizing their role in advancing the efficiency of electrochemical energy storage and conversion materials.

关键词： Point defect engineering Doping Vacancy Electrocatalysis Electronic structure

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超大采高综放开采运输系统装备配套技术研究

煤炭技术 2025年第1期44卷 228-233页

作者：袁涛刘卫东陈元祯孟科孟凡帅岳镇陕西未来能源化工有限公司金鸡滩煤矿陕西榆林719000 大连大学岩土与结构工程技术辽宁省研究中心辽宁大连116622 大连大学建筑工程学院辽宁大连116622

以“采煤机、刮板输送机、液压支架”工作面三机,“转载机、破碎机、带式输送机”顺槽三机以及供电系统、供液系统、控制系统和通信系统为配套的大型采煤设施装备是煤炭工业平稳高效发展的重要支柱。本项目以满足特厚煤层超大采高综放... 详细信息

以“采煤机、刮板输送机、液压支架”工作面三机,“转载机、破碎机、带式输送机”顺槽三机以及供电系统、供液系统、控制系统和通信系统为配套的大型采煤设施装备是煤炭工业平稳高效发展的重要支柱。本项目以满足特厚煤层超大采高综放开采装备配套需求为目标,以高可靠性、长寿命、自动化、智能化技术为攻关重点,开发包含装机功率2×2000 kW前部输送机、装机功率3×1600 k W后部输送机及配套转载机、破碎机的超重型、超大运量,以及操作方式的自动化、智能化、形成了高可靠性综放工作面成套输送设备,并通过运输过程中发现的问题对转载机进行了相应的升级改造,确保了煤块流畅地卸载于顺槽转载机上,尽量减少回煤;创新性地开发了带式自移支撑装置,实现了装置的自行前移、支撑高度调整,有效减少了带式输送机中间架拆架次数。运输系统设备的升级改造满足产量15 Mt/a以上特厚煤层综放工作面开采需要。

关键词：大采高运输设备安全保障工程应用

Abnormally expressed circular RNAs as novel non-invasive biomarkers for hepatocellular carcinoma: A meta-analysis

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World Journal of Gastrointestinal Oncology 2019年第10期11卷 909-924页

作者： Ya-Lin Jiang meng-meng Shang Shi-zhen Dong Yong-Chao Chang Department of Clinical Laboratory The First Affiliated Hospital and College of Clinical Medicine of Henan University of Science and TechnologyLuoyang 471003Henan ProvinceChina Department of Clinical Laboratory The Family Planning Guidance Station of Luanchuan CountyLuoyang 471500Henan ProvinceChina

BACKGROUND Circular RNAs(circRNAs)are a newly discovered class of endogenous noncoding RNAs that may have roles in cancer genesis and *** the recent literature,dysregulated circRNAs have been extensively investigated in hepatocellular carcinoma(HCC).Whether or not circRNAs are of clinical value for the management of HCC has not been *** To meta-analyze the diagnostic and prognostic value of abnormally expressed circRNAs in *** Eligible studies were sourced from PubMed,EMBASE,and CNKI online *** on patients’clinical characteristics,including diagnostic efficacy and overall survival,were *** diagnostic and prognostic parameters were respectively synthesized using the bivariate meta-analysis model and multivariate Cox hazard regression analysis based on Stata *** trim and fill method was adopted to assess the possible effects from publication *** A total of 21 eligible studies were *** pooled sensitivity,specificity,and area under the curve of abnormally expressed circRNAs in distinguishing HCC from non-cancer controls were 0.78(95%CI:0.69–0.85),0.80(95%CI:0.74–0.86),and 0.86,*** analyses showed that the downregulated circRNA expression signature correlated perfectly with HCC survival[hazard ratio(HR)=0.42,95%CI:0.19–0.91,P=0.028;I2=92.7%,P=0.000],whereas the HCC cases with high circRNA levels had significantly poorer prognoses than those of patients with low circRNA levels(HR=2.22,95%CI:1.50–3.30,P=0.000;I2=91%,P=0.000).Moreover,abnormally expressed circRNAs were intimately associated with tumor size,differentiation grade,microvascular invasion,metastasis,TNM stage,and serum alpha fetal protein level in patients with *** analysis based on sample type,control source,and expression status also yielded robust *** Abnormally expressed circRNA signatures show immense potential as novel non-invasive biomarker(s)for HCC diagnosis and prognosis.

关键词： CircRNA Hepatocellular carcinoma Diagnosis Prognosis Meta-analysis

Effect of Application of a Bacteria Inoculant and Wheat Bran on Fermentation Quality of Peanut Vine Ensiled Alone or with Corn Stover

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Journal of Integrative Agriculture 2013年第3期12卷 556-560页

作者： QIN meng-zhen SHEN Yi-xin College of Animal Science and Technology Nanjing Agricultural University

To find an effective method for ensiling peanut vine （PV）, fermentation characteristics and nutritional values of PV silage and the mixture of PV with corn stover （CS） silage in a ratio of 1 ： 1 fresh weight, prepared by adding lactic acid bacteria （LAB）, 10% wheat bran （WB） and LAB＋WB at ensiling were evaluated in 2009 and 2010. The fermentation qualities of PV silage ensiled with the LAB and WB additives were improved compared with those of the control （PV ensiled alone）. However, the pH did not decline to the critical level of 4.2, and the nutritional values of the silage were not protected against losses in the LAB and WB addition silages. Ensiling PV in mixture with CS generated optimal moisture content and buffering capacity （BC） of ensiled materials. After adding the LAB and WB additives to mixture silage, especially adding LAB＋WB, the fermentation qualities and nutritional values of the mixture silage were improved significantly （P〈0.05）, and the Flieg＇s score reached to 99. The result suggested that it is a feasible method to ensile the mixed materials of PV with CS by adding LAB and high concentration of water soluble-carbohydrate materials for providing a good fermentation quality of PV silage.

关键词： peanut vine corn stover lactic bacteria acid wheat bran straw fermentation quality

Numerical study of a guide-vane-augmented vertical darrieus tidal-currentturbine

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Journal of Hydrodynamics 2019年第3期31卷 522-530页

作者： zhen Liu Zhi-meng Wang Hong-da Shi Heng-liang Qu Shandong Provincial Key Laboratory of Ocean Engineering Ocean University of China Qingdao 266100 China Department of Ocean Engineering College of Engineering Ocean University of China Qingdao 266100 China Qingdao Municipal Key Laboratory of Ocean Renewable Energy Ocean University of China Qingdao 266100 China

It is reported that the augmented vertical axis turbine (VAT) has a better operating performance. A guide-vane type augmentation is proposed in this study, with a simpler outline and a better adaptability to various directions of the incident water flow, as compared to the duct-type diffuser. A 2?D numerical model based on the computational fluid dynamics software ANSYS-Fluent is established and validated by experimental data. It is found that the guide vanes could narrow the flow path together with the VAT rotor and increase the flow velocity around the blades. The fluctuation of the instantaneous torque output is significantly reduced by using the guide-vane stator. The numerical results indicate that a four blades setup is suitable for the stator and the chord length of the guide vane should be equal to that of the rotor blade. The gap between the stator and the rotor is suggested to be a quarter of the chord length of the rotor blades. The non-zero pitch angle of the guide vane is found to have negative effects on the torque and the power output. The averaged power and torque coefficients for three non-zero directional angles of the incident flow are approximately 30% lower than those for the zero-directional angle.

关键词： Tidal current energy vertical axis turbine augmented rotor guide vane numerical simulation

A deep learning method for solving high-order nonlinear soliton equations

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Communications in Theoretical Physics 2022年第7期74卷 57-69页

作者： Shikun Cui zhen Wang Jiaqi Han Xinyu Cui Qicheng meng School of Mathematical Sciences Dalian University of TechnologyDalian 116024China State Key Laboratory of Satellite Ocean Environment Dynamics Second Institute of OceanographyMinistry of Natural ResourcesHangzhou 310o00China Key Laboratory for Computational Mathematics and Data Intelligence of Liaoning Province Dalian 116024Chin

We propose an effective scheme of the deep learning method for high-order nonlinear soliton equations and explore the influence of activation functions on the calculation results for higherorder nonlinear soliton equations. The physics-informed neural networks approximate the solution of the equation under the conditions of differential operator, initial condition and boundary condition. We apply this method to high-order nonlinear soliton equations, and verify its efficiency by solving the fourth-order Boussinesq equation and the fifth-order Korteweg–de Vries equation. The results show that the deep learning method can be used to solve high-order nonlinear soliton equations and reveal the interaction between solitons.

关键词： deep learning method physics-informed neural networks high-order nonlinear soliton equations interaction between solitons the numerical driven solution