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Uplift mechanism for a shallow-buried structure in liquefi able sand subjected to seismic load: centrifuge model test and DEM modeling

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Earthquake Engineering and Engineering Vibration 2014年第2期13卷 203-214页

作者： Zhou Jian Wang Zihan chen xiaoliang Zhang Jiao Department of Geotechnical Engineering Tongji University School of Civil Engineering Hebei University of Technology Hangzhou Municipal Construction Group Co. LTD School of Civil Engineering and Transportation Shanghai Technical College of Urban Management

Based on a centrifuge model test and distinct element method(DEM), this study provides new insights into the uplift response of a shallow-buried structure and the liquefaction mechanism for saturated sand around the structure under seismic action. In the centrifuge test, a high-speed microscopic camera was installed in the structure model, by which the movements of particles around the structure were monitored. Then, a two-dimensional digital image processing technology was used to analyze the microstructure of saturated sand during the shaking event. Herein, a numerical simulation of the centrifuge experiment was conducted using a two-phase(solid and fl uid) fully coupled distinct element code. This code incorporates a particle-fl uid coupling model by means of a "fi xed coarse-grid" fl uid scheme in PFC3D(Particle Flow Code in Three Dimensions), with the modeling parameters partially calibrated based on earlier studies. The physical and numerical models both indicate the uplifts of the shallow-buried structure and the sharp rise in excess pore pressure. The corresponding micro-scale responses and explanations are provided. Overall, the uplift response of an underground structure and the occurrence of liquefaction in saturated sand are predicted successfully by DEM modeling. However, the dynamic responses during the shaking cannot be modeled accurately due to the restricted computer power.

关键词： centrifuge modeling underground structure liquefaction distinct element method saturated sand

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Piezoelectric Drop-on-Demand Inkjet Printing with Ultra-High Droplet Velocity

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Research 2024年第3期2023卷 123-137页

作者： Zhengjie Yang Hongmiao Tian Chunhui Wang Xiangming Li xiaoliang chen Xiaoming chen Jinyou Shao State Key Laboratory for Manufacturing Systems Engineering Xi’an Jiaotong UniversityXi’anShaanxi 710049China Frontier Institute of Science and Technology(FIST) Xi’an Jiaotong UniversityXi’anShaanxi 710049China.

Improving droplet velocity as much as possible is considered as the key to improving both printing speed and printing distance of the piezoelectric drop-on-demand inkjet printing *** are 3 tough and contradictory issues that need to be addressed simultaneously,namely,the actuation pressure of the piezoelectric printhead,satellite droplets,and the air resistance,which seems almost impossible to achieve with classical ***,a novel solution is *** modulating the positive crosstalk effect inside and outside the printhead,self-tuning can be achieved,including self-reinforcing of the actuation pressure,self-restraining of satellite droplets,and self-weakening of the air resistance,thereby greatly improving droplet *** on these mechanisms,waveform design methods for different inks and printheads are *** results demonstrate that monodisperse droplet jetting with a maximum velocity of 27.53 m/s can be achieved,reaching 3 to 5 times that of the classical method(5 to 8 m/s).Correspondingly,the printing speed and distance can be simultaneously increased by almost 10 times,demonstrating an ability of direct printing on irregular ***,the compatibility of ink materials is expanded,as the Ohnesorge number and the viscosity of printable inks for the printhead used are increased from 0.36–0.72 to 0.03–1.18 and from 10–12 cp to 1–40.3 cp,respectively,even breaking the traditional limitations of the piezoelectric printing technology(Ohnesorge number of 0.1 to 1;viscosity of 1 to 25 cp).All the above provide a new perspective for improving droplet velocity and may even offer a game-changing choice for expanding the boundaries of the piezoelectric drop-on-demand inkjet printing technology.

关键词： piezoelectric viscosity thereby

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A flexible dual-function capacitive sensor enhanced by looppatterned fibrous electrode and doped dielectric pillars for spatial perception

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Nano Research 2023年第5期16卷 7550-7558页

作者： Yongsong Luo xiaoliang chen Xiangming Li Hongmiao Tian Liang Wang Jinyou Shao Micro-and Nano-technology Research Center State Key Laboratory for Manufacturing Systems EngineeringXi’an Jiaotong UniversityXi’an 710049China Frontier Institute of Science and Technology(FIST) Xi’an Jiaotong UniversityXi’an 710049China

The integrated perception capable of detecting and monitoring varieties of activities is one of the ultimate purposes of wearable electronics and intelligent *** by the space occupation,it lacks practical feasibility to stack multiple types of single sensors on each ***,a high-sensitivity dual-function capacitive sensor with proximity sensing and pressure sensing is *** fringing electric field can be confined in the proximity-sensitive area by fibrous loop-patterned electrode,leading to more stolen charges when object approaching and thus a high proximity *** high-permittivity doped structured dielectric layer reduces the compressive stiffness and enhances the rate of compression-caused increase in the equivalent relative permittivity of the dielectric layer,resulting in a larger increase in capacitance and thus a high pressure *** electrodes and dielectric layer together compose the capacitor and act as the sensor without taking up additional *** decoupling of proximity-sensing and pressure-sensing modes can be achieved by decrease or increase in *** with array distribution and sequential scanning,the sensors can be used for detection of motion trajectory,contour recognition,pressure distribution.

关键词： capacitive proximity sensing pressure sensing fibrous microstructuring doping

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Nanoimprint lithography for the manufacturing of flexible electronics

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Science China(Technological Sciences) 2019年第2期62卷 175-198页

作者： SHAO JinYou chen xiaoliang LI XiangMing TIAN HongMiao WANG ChunHui LU BingHeng State Key Laboratory for Manufacturing Systems Engineering Xi'an Jiaotong University

Flexible electronics have received considerable attention in academies and industries for their promising applications in enormous fields, such as flexible displays, wearable sensors, artificial skins, and flexible energy devices. Challenges remain in developing a flexible and scalable manufacturing method to facilitate the fabrication of multi-functional structures in a flexible electronic system. Nanoimprint lithography is a high resolution and low-cost approach to fabricate nanostructures over a large area. This paper reviews recent progress of nanoimprint lithography and its applications in flexible electronics. The basic principles, classification, research focus, and critical issues of nanoimprint lithography are elaborated. Then, the advantages of nanoimprint lithography are demonstrated in several typical applications related to flexible electronics, including conductive films, optoelectronic devices, flexible sensors, energy harvesting and storage devices, and bioinspired electronic devices. Finally,the challenges and perspectives of nanoimprint lithography in flexible electronic systems are discussed.

关键词： nanoimprint lithography manufacturing flexible electronics nanostructures sensors

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Gecko-Inspired Slant Hierarchical Microstructure-Based Ultrasensitive Iontronic Pressure Sensor for Intelligent Interaction

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Research 2022年第4期2022卷 1-13页

作者： Yongsong Luo xiaoliang chen Hongmiao Tian Xiangming Li Yangtianyu Lu Yang Liu Jinyou Shao Micro-and Nano-Technology Research Center State Key Laboratory for Manufacturing Systems EngineeringXi'an JiaotongUniversityXi'an710049China Frontier Institute of Science and Technology(FIST) Xian Jiaotong UniversityXi'an 710049China

Highly sensitive flexible pressure sensors play an important role to ensure the safety and friendliness during the human-robot interaction *** the active layer has been shown to improve performance of pressure ***,the current structural strategy almost relying on axial compression deformation suffers structural stifening,and together with the limited area growth efficiency of conformal interface,essentially limiting the maximum ***,inspired by the interface contact behavior of gecko's feet,we design a slant hierarchical microstructure to act as an electrode contacting with an ionic gel layer,fundamentally eliminating the pressure resistance and maximizing functional interface expansion to achieving ultrasensitive *** a structuring strategy dramatically improves the relative capacitance change both in the low-and high-pressure region,thereby boosting the sensitivity up to 36000kPa^(-1) and effective measurement range up to *** verify the advantages of high sensitivity,the sensor is integrated with a soft magnetic robot to demonstrate a biomimetic Venus *** ability to perceive weak stimuli allows the sensor to be used as a sensory and feedback window,realizing the capture of small live insects and the transportation of fragile objects.

关键词： robot boosting interface

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Electric-driven flexible-roller nanoimprint lithography on the stress-sensitive warped wafer

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International Journal of Extreme Manufacturing 2023年第3期5卷 608-618页

作者： Yu Fan Chunhui Wang Jiaxing Sun Xiaogang Peng Hongmiao Tian Xiangming Li xiaoliang chen Xiaoming chen Jinyou Shao Micro-and Nano-technology Research Center State Key Laboratory for Manufacturing Systems EngineeringXi'an Jiaotong UniversityXi’an 710049People’s Republic of China Frontier Institute of Science and Technology(FIST) Xi'an Jiaotong UniversityXi’an710049People’s Republic of China

Surface nanopatterning of semiconductor optoelectronic devices is a powerful way to improve their quality and ***,photoelectric devices’inherent stress sensitivity and inevitable warpage pose a huge challenge on fabricating nanostructures ***-driven flexible-roller nanoimprint lithography for nanopatterning the optoelectronic wafer is proposed in this *** flexible nanoimprint template twining around a roller is continuously released and recovered,controlled by the roller’s simple *** electric field applied to the template and substrate provides the driving *** contact line of the template and the substrate gradually moves with the roller to enable scanning and adapting to the entire warped substrate,under the electric *** addition,the driving force generated from electric field is applied to the surface of substrate,so that the substrate is free from external ***,liquid resist completely fills in microcavities on the template by powerful electric field force,to ensure the fidelity of the *** proposed nanoimprint technology is validated on the ***,nano-grating structures are fabricated on a gallium nitride light-emitting diode chip adopting the solution,achieving polarization of the light source.

关键词： nanoimprinting electric-driven flexible-roller warped stress-sensitive

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Sensitivity analysis of CO_2 sequestration in saline aquifers

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Petroleum Science 2010年第3期7卷 372-378页

作者： Zhao Hongjun Liao Xinwei chen Yanfang Zhao xiaoliang Key Laboratory of Petroleum Engineering Ministry of Education China University of Petroleum Beijing 102249 China

Carbon capture and storage （CCS） technology has been considered as an important method for reducing greenhouse gas emissions and for mitigating global climate change. Three primary options are being considered for large-scale storage of CO2 in subsurface formations： oil and gas reservoirs, deep saline aquifers, and coal beds. There are very many large saline aquifers around the world, which could make a big contribution to mitigating global warming. However, we have much less understanding of saline aquifers than oil and gas reservoirs. Several mechanisms are involved in the storage of CO2 in deep saline aquifers, but the ultimate goal of injection of CO2 into the aquifers containing salt water is to dissolve the CO2 in the water. So it is important to study the solubility trapping and sensitivity factors of CO2 in saline aquifers. This paper presents results of modeling CO2 storage in a saline aquifer using the commercial reservoir simulator ECLIPSE. The objective of this study was to better understand the CO2/brine phase behavior （PVT properties） and quantitatively estimate the most important CO2 storage mechanism in brine-solubility trapping. This would provide a tool by performing theoretical and numerical studies that help to understand the feasibility of CO2 geological storage. A 3-dimensional, 2-phase （water/gas） conceptional reservoir model used finite, homogenous and isothermal formations into which CO2 is injected at a constant rate. The effects of main parameters were studied, including the vertical to horizontal permeability ratio kv/kh, salinity, and residual phase saturations. The results show that the vertical to horizontal permeability ratio has a significant effect on CO2 storage. Moreover, more CO2 dissolves in the brine at lower kv/kh values.

关键词： CO2 geologic sequestration saline aquifer solubility trapping numerical simulation

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Preparation of Manganese Oxide and Its Adsorption Properties

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Journal of Wuhan University of Technology(Materials Science) 2024年第4期39卷 1031-1040页

作者：贺跃王海峰 YANG Pan WANG Song chen xiaoliang YANG Chunyuan 王家伟 School of Materials and Metallurgy Guizhou UniversityGuiyang 550025China Guizhou Provincial Engineering Technology Research Center of Manganese Materials for Batteries Tongren Guizhou 554300China Guizhou Provincial Key Laboratory of Metallurgical Engineering and Energy Saving Guiyang 550025China

The in-situ oxidation of manganese sulfate solution with H2O_(2),sodium hypochlorite,potassium permanganate and oxygen as oxidants was investigated by means of SEM,EDS,XRD,BET and infrared analysis,and the effects of different oxidants on the morphology,phase composition,surface properties and specific surface area of manganese oxides were *** experimental results show that the diameter of manganese oxide particles prepared with H_(2)O_(2)is the smallest,about 50 nm,and the specific surface area is the largest,63.8764 m^(2)/*** has the advantages of abundant surface hydroxyl groups,no introduction of other impurities and large adsorption *** is most suitable to be used as an oxidant for oxidizing manganese sulfate solution to prepare manganese oxide by in-situ *** manganese oxide prepard by H_(2)O_(2)in-situ oxidation method is used as adsorbent to adsorb cobalt and nickel impurities in manganese *** the reaction pH is 6,the reaction time is 30min and the amount of adsorbent is 1.0 g,the adsorption rates of cobalt and nickel impurities in 100ml manganese sulfate solution are 97.59%and 97.67%,*** residual amounts of cobalt and nickel meet the industrial process standard of first-class products(Co,Ni w/%≤0.005)of high-purity manganese sulfate(Hg/t4823-2015)for *** study plays a guiding role in the preparation and regulation of manganese oxide,and provides a new method with high efficiency,purity and adsorbent availability for the preparation of high-purity manganese sulfate solution.

关键词： manganese oxide in situ oxidation adsorbent regulation mechanism physical chemical properties

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LLaMA-LoRA Neural Prompt Engineering:A Deep Tuning Framework for Automatically Generating Chinese Text Logical Reasoning Thinking Chains

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Data Intelligence 2024年第2期6卷 375-408页

作者： Songlin chen Weicheng Wang xiaoliang chen Peng lu Zaiyan Yang Yajun Du School of Computer and Software Engineering Xihua Universitychengdu 610039P.R.china Department of Computer Science and Operations Research University of MontrealMontrealQC H3C3J7Canada College of Artificial intelligence Beijing University of Posts and TelecommunicationsBeijing100876China

The exption of Chinese natural language processing(NLP)has stimulated research in the broader NLP ***,existing large language models have limitations in comprehending and reasoning in *** paper addresses these limitations by enhancing Chinese language models comprehension and reasoning capabilities while minimizing resource *** propose LLaMA-LoRA,a neural prompt engineering framework that builds upon the LLaMA-13B model and incorporates the Low-Rank Adaptation(LoRA)of Large Language Models technique for ***-of-Thought(CoT)are crucial for generating intermediate reasoning chains in language models,but their effectiveness can be limited by isolated language *** reasoning resulting from conventional prompts negatively impacts model *** prompts are introduced to encourage reasoning chain generation and accurate answer *** the model with an extensive corpus of Chinese CoT data enhances its comprehension and reasoning *** LLaMA-LoRA model demonstrates exceptional performance across numerous Chinese language tasks,surpassing benchmark performance achieved by related language models such as GPT-3.5,Chat-GLM,and OpenAssistant,delivering accurate,comprehensive,and professional *** availability of our open-source model code facilitates further research in the field of Chinese text logical reasoning thinking chains.

关键词： Chinese natural language processing Neural prompt engineering Large language models Low-Rank adaptation Chain-of-thought

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Regulatory network established by transcription factors transmits drought stress signals in plant

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Stress Biology 2022年第1期2卷 361-382页

作者： Yongfeng Hu xiaoliang chen Xiangling Shen Key Laboratory of Three Gorges Regional Plant Genetics and Germplasm Enhancement Biotechnology Research CenterChina Three Gorges UniversityYichang 443002HubeiChina

Plants are sessile organisms that evolve with a flexible signal transduction system in order to rapidly respond to environmental ***,a common abiotic stress,affects multiple plant developmental processes especially *** response to drought stress,an intricate hierarchical regulatory network is established in plant to survive from the extreme *** transcriptional regulation carried out by transcription factors(TFs)is the most important step for the establishment of the *** this review,we summarized almost all the TFs that have been reported to participate in drought tolerance(DT)in *** 466 TFs from 86 plant species that mostly belong to 11 families are collected *** demonstrates that TFs in these 11 families are the main transcriptional regulators of plant *** regulatory network is built by direct protein-protein interaction or mutual regulation of *** receive upstream signals possibly via post-transcriptional regulation and output signals to downstream targets via direct binding to their promoters to regulate gene expression.

关键词： Plant Drought tolerance Transcription factor Regulatory network Direct target

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