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droplet morphology analysis of drop-on-demand inkjet printing

China Foundry 2024年第1期21卷 20-28页

作者： Hu-xiang Xia Takechi Kensuke Tajima Shin Kawamura Yoshiumi Qing-yan Xu Key Laboratory for Advanced Materials Processing Technology(MOE) School of Materials Science and EngineeringTsinghua UniversityBeijing 100084China Toyota Central R&D Labs. Inc.41-1 Yokomichi NagakuteAichi 480-1192Japan Frontier Research Center Toyota Motor Corporation1 Toyota-ChoToyotaAichi 471-8572Japan

As an accurate 2d/3d fabrication tool,inkjet printing technology has great potential in preparation of micro electronic *** morphology of droplets produced by the inkjet printer has a great impact on the accuracy of *** this study,the drop-on-demand(dod)inkjet simulation model was established,and the accuracy of the simulation model was verified by corresponding *** simulation result shows that the velocity of the droplet front and tail,as well as the time to disconnect from the nozzle is mainly affected by density(ρ),viscosity(μ)and surface tension(σ)of *** the liquid filament is about to disconnect from the nozzle,the filament length and filament front velocity are found to have a linear correlation withσ/ρμand ln(ρ/(μσ1/2)).

关键词： microdevice fabrication inkjet printing droplet morphology modeling and simulation

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Three-dimensional breast cancer tumor models based on natural hydrogels:a review

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Journal of Zhejiang University-Science B(Biomedicine & Biotechnology) 2024年第9期25卷 736-755页

作者： Yan SHU Bing LI Hailin MA Jiaqi LIU Yuen Yee CHENG Xiangqin LI Tianqing LIU Chuwei YANG Xiao MA Kedong SONG State Key Laboratory of Fine Chemicals Dalian R&D Center for Stem Cell and Tissue EngineeringDalian University of TechnologyDalian116024China Institute for Biomedical Materials and Devices Faculty of ScienceUniversity of Technology SydneySydneyNSW2007Australia Emergency Center The Second Hospital of Dalian Medical UniversityDalian116023China Department of Anesthesia The First Affiliated Hospital of Dalian Medical UniversityDalian116011China

Breast cancer is the most common cancer in women and one of the deadliest cancers *** to the distribution of tumor tissue,breast cancer can be divided into invasive and non-invasive *** cancer cells in invasive breast cancer pass through the breast and through the immune system or systemic circulation to different parts of the body,forming metastatic breast *** resistance and distant metastasis are the main causes of death from breast *** on breast cancer has attracted extensive attention from *** vitro construction of tumor models by tissue engineering methods is a common tool for studying cancer mechanisms and anticancer drug *** tumor microenvironment consists of cancer cells and various types of stromal cells,including fibroblasts,endothelial cells,mesenchymal cells,and immune cells embedded in the extracellular *** extracellular matrix contains fibrin proteins(such as types Ⅰ,Ⅱ,Ⅲ,Ⅳ,Ⅵ,and Ⅹ collagen and elastin)and glycoproteins(such as proteoglycan,laminin,and fibronectin),which are involved in cell signaling and binding of growth *** current traditional two-dimensional(2d)tumor models are limited by the growth environment and often cannot accurately reproduce the heterogeneity and complexity of tumor tissues in ***,in recent years,research on three-dimensional(3d)tumor models has gradually increased,especially 3d bioprinting models with high precision and *** with a 2d model,the 3d environment can better simulate the complex extracellular matrix components and structures in the tumor ***-dimensional models are often used as a bridge between 2d cellular level experiments and animal *** matrix,gelatin,sodium alginate,and other natural materials are widely used in the construction of tumor models because of their excellent biocompatibility and non-immune ***,we review various natural scaffold materials and con

关键词： Breast cancer Tumor microenvironment 3d tumor model decellularized extracellular matrix Natural scaffold materials

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research and Application of Multilevel Wellbore Quality Quantification Method Based on random Forest Algorithm 13th

Research and Application of Multilevel Wellbore Quality Quan...

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13th International Field Exploration and development Conference, IFEdC 2023

作者： Xiao, Yue Zhou, Tuo Li, Hangyuan Kong, Xiangji Song, Lu diao, Shunong Liu, Jitong Zhong, Zhao Jin, Yulai Li, Bingrou CNPC Engineering Technology R&D Company Limited Beijing102206 China China National Oil and Gas Exploration and Development Corporation Beijing China National Engineering Research Center for Oil and Gas Drilling and Completion Technology Beijing China College of Petroleum Engineering Beijing China

ISBN: (纸本)9789819702558

The quality of drilling wellbore is crucial for oilfield companies to evaluate the construction acceptance of drilling operations, evaluate the wellbore quality before cementing operations, and smoothly implement subsequent casing and electrical logging tools. At present, the evaluation of wellbore quality only requires dispersed trajectory parameters of different well sections (well inclination angle, dog leg angle, target range), and only considers whether the trajectory parameters are within the qualified range during completion acceptance. A quantitative scoring method for wellbore quality has not yet been developed, which is not conducive to the evaluation of well quality by oilfield enterprises during drilling completion acceptance. In this paper, the key parameters such as deviation measurement interval, dogleg degree, maximum deviation and target hit are comprehensively considered. Based on the comprehensive method of mathematical statistics and Matlab programming calculation, a multi-level quantitative scoring model of well bore quality is established. The key parameters in the multi-level quantitative model of well bore quality are determined by using the main control factor analysis method of random forest algorithm. Taking the A oil field as an example, a quantitative scoring was conducted on the quality of 74 drilled wells in 2021 to evaluate the effectiveness of the operation team in controlling well quality. The analysis results showed that for the A oil field, the importance of factors affecting well quality was as follows: maximum inclination > Target radius > dog leg = survey interval. Crew 1 had better control over well quality, and the proportion of high-quality wells in 2021 decreased compared to 2020, The analysis results of the multi-level well bore quality quantification method based on random forest algorithm proposed in this paper are in line with the field work practice, which provides a theoretical basis for well bore quality quantificati

关键词： MATLAB

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real-time porosity reduction during metal directed energy deposition using a pulse laser

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Journal of Materials Science & technology 2022年第21期116卷 214-223页

作者： Hoon Sohn Peipei Liu Hansol Yoon Kiyoon Yi Liu Yang Sangjun Kim Department of Civil and Environmental Engineering Korea Advanced Institute of Science and Technology(KAIST)Daejeon 34141Republic of Korea Center for 3D Printing Nondestructive Testing Korea Advanced Institute of Science and Technology(KAIST)Daejeon 34141Republic of Korea Global R&D Center SQ EngineeringSeoul 05818Republic of Korea Department of Civil and Environmental Engineering The Hong Kong University of Science and TechnologyClear Water BayKowloonHong KongChina

Porosity is a challenging issue in additive manufacturing and is detrimental to the quality of the additively manufactured *** this study,a real-time porosity reduction technique was developed by incorporating a pulse laser into a laser metal powder directed energy deposition(dEd)*** incorporated pulse laser can accelerate fluid flow within the melt pool and facilitate the escape of pores before complete *** achieves this real-time porosity reduction by inducing accelerated and turbulent Marangoni flow,ultrasonic waves,and shock waves into the melt *** uniqueness and advantages of the proposed technique include the following:(1)For a laser metal powder dEd process,this study proposed a noncontact,nondestructive,and real-time porosity reduction technique at the melt pool level.(2)It was experimentally and numerically validated that the developed technique did not alter the geometry and the grain structure of the manufactured Ti-6Al-4V samples.(3)Because the porosity reduction is accomplished at the melt pool level,its application is not limited by the size,shape,or complexity of the printing target.(4)The developed technique can be readily incorporated into the existing dEd systems without any modification of the original tool-path *** experimental results showed that the pore volume fraction decreased from 0.132%to 0.005%,no pores larger than 6×10^(4)μm^(3) were observed,and a 91%reduction in the total pore number was achieved when the pulse laser energy reached 11.5 mJ.

关键词： real-time porosity reduction Pulse laser Melt pool directed energy deposition Ti-6Al-4V

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Preparation of multicore millimeter-sized spherical alginate capsules to specifically and sustainedly release fish oil

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Food Science and Human Wellness 2023年第2期12卷 397-406页

作者： Lina Tao Panpan Wang Ting Zhang Mengzhen ding Lijie Liu Ningping Tao Xichang Wang Jian Zhong National R&D Branch Center for Freshwater Aquatic Products Processing Technology(Shanghai) Integrated Scientific Research Base on Comprehensive Utilization Technology for By-Products of Aquatic Product ProcessingMinistry of Agriculture and Rural Affairs of the People's Republic of ChinaShanghai Engineering Research Center of Aquatic-Product Processing and PreservationCollege of Food Science&TechnologyShanghai Ocean UniversityShanghai 201306China

Specific and sustained release of nutrients from capsules to the gastrointestinal tract has attracted many attentions in the field of food and drug *** this work,we reported a monoaxial dispersion electrospraying-ionotropic gelation technique to prepare multicore millimeter-sized spherical capsules for specific and sustained release of fish *** spherical capsules had diameters from 2.05 mm to 0.35 mm with the increased applied *** capsules consisted of uniform(at applied voltages of≤10 k V)or nonuniform(at applied voltages of>10 k V)*** obtained capsules had reasonable loading ratios(9.7%-6.3%)due to the multicore *** addition,the obtained capsules had specific and sustained release behaviors of fish oil into the small intestinal phase of in vitro gastrointestinal tract and small intestinal tract *** simple monoaxial dispersion electrospraying-ionotropic gelatin technique does not involve complicated preparation formulations and polymer modification,which makes the technique has a potential application prospect for the fish oil preparations and the encapsulation of functional active substances in the field of food and drug industries.

关键词： Ionotropic gelation Millimeter-sized spherical capsule Monoaxial dispersion electrospraying Multicore Specific and sustained release

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Effects of grape seed extract on meat color and premature browning of meat patties in high-oxygen packaging

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Journal of Integrative Agriculture 2022年第8期21卷 2445-2455页

作者： YANG Xiao-yin XU Bao-chen LEI Hong-mei LUO Xin ZHU Li-xian ZHANG Yi-min MAO Yan-wei LIANG rong-rong Laboratory of Beef Processing and Quality Control College of Food Science and EngineeringShandong Agricultural UniversityTai’an 271018P.R.China National R&D Center for Beef Processing Technology Tai’an 271018P.R.China

This study investigated the effects of grape seed extract(GSE)on fresh and cooked meat color and premature browning(PMB)in ground meat patties(85% beef and 15% pork back fat)packaged under high-oxygen modified atmospheres(HiOx-MAP).The GSE was added to patties at concentrations of 0,0.10,0.25,0.50 and 0.75 g kg^(-1).This study evaluated the surface color,pH,lipid oxidation,and total viable counts(TVC)of raw patties,and the internal color and pH of patties cooked to a temperature of 66 or 71℃ over 10-day storage at 4℃.Compared with the control(0 g kg^(-1) GSE),GSE improved the color stability(P<0.05)and significantly inhibited the lipid and myoglobin oxidation of raw patties from day 5 to 10,but GSE had no effect(P>0.05)on *** containing 0.50 and 0.75 g kg^(-1) GSE cooked to 66℃ exhibited greater(P<0.05)interior redness than the control and reduced the PMB of cooked patties in the late storage *** results suggested that 0.50 and 0.75 g kg^(-1) GSE can improve fresh meat color and minimize PMB of HiOx-MAP patties.

关键词： ground meat patties grape seed extract meat color premature browning high oxygen packaging lipid oxidation

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MSCNN-LSTM Model for Predicting return Loss of the UHF Antenna in HF-UHF rFId Tag Antenna

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Computers, Materials & Continua 2023年第5期75卷 2889-2904页

作者： Zhao Yang Yuan Zhang Lei Zhu Lei Huang Fangyu Hu Yanping du Xiaowei Li School of Mechanical and Electrical Engineering Beijing Institute of Graphic CommunicationBeijing102600China Postal Industry Technology R&D Center Beijing Institute of Graphic CommunicationBeijing102600China Collage of Electronic Information and Automation Civil Aviation University of ChinaTianjin300300China

High-frequency(HF)and ultrahigh-frequency(UHF)dual-band radio frequency identification(rFId)tags with both near-field and farfield communication can meet different application ***,it is time-consuming to calculate the return loss of a UHF antenna in a dualband tag antenna using electromagnetic(EM)*** overcome this,the present work proposes a model of a multi-scale convolutional neural network stacked with long and short-term memory(MSCNN-LSTM)for predicting the return loss of UHF antennas instead of EM *** the proposed MSCNN-LSTM,the MSCNN has three branches,which include three convolution layers with different kernel sizes and ***,MSCNN can extract fine-grain localized information of the antenna and overall *** LSTM can effectively learn the EM characteristics of different structures of the antenna to improve the prediction accuracy of the *** results show that the mean absolute error(0.0073),mean square error(0.00032),and root mean square error(0.01814)of theMSCNNLSTM are better than those of other prediction *** predicting the return loss of 100UHFantennas,compared with the simulation time of 4800 s for High Frequency Structure Simulator(HFSS),MSCNN-LSTM takes only 0.927519 s under the premise of ensuring prediction accuracy,significantly reducing the calculation time,which provides a basis for the rapid design of HF-UHF rFId tag ***-LSTM is used to determine the dimensions of the UHF antenna *** return loss of the designed dualband rFId tag antenna is−58.76 and−22.63 dB at 13.56 and 915 MHz,respectively,achieving the desired goal.

关键词： HF-UHF rFId tag antenna multi-scale convolutional neural network long-short term memory return loss

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Effects of Ethylene Tar-Based Pitch Coatings on the Electrochemical Properties of Graphite Anode Materials

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China Petroleum Processing & Petrochemical technology 2023年第2期25卷 41-50页

作者： Xing Yicheng dai Chang Wu Qiang Wang Taoxiang Li Zhi Lei Jie Han Haibo Li Kang Wang Youhe Luoyang R&D Center of Technology of Sinopec Engineering(Group)Co.Ltd. Luoyang 471003China State Key Laboratory of Heavy Oil Processing China University of PetroleumQingdao 266580China Sinopec Maoming Petrochemical Co.Ltd. Maoming 525000China

To improve the electrochemical performance of graphite anode materials,pitches with various softening points(150℃,180℃,200℃,and 250℃)were prepared from ethylene tar and used to coat graphite through a liquid coating *** effects of the softening point of the pitch and the coating amount on the microstructure and electrochemical properties of graphite were studied by methods including thermogravimetric analysis,X-ray diffraction,raman spectroscopy,surface area analysis,scanning electron microscopy,transmission electron microscopy,and electrochemical *** graphite particles were coated uniformly by the pyrolytic carbon in the *** coating changed the degree of graphitization,decreased the average specific surface area,and improved the electrochemical performance *** best battery anode performance was obtained when the mass ratio of pitch to graphite was 10%,the heat treatment temperature was 1100℃,and the softening point of the pitch was 250℃.Under the optimum conditions,the irreversible capacity loss in the first cycle at 0.1 C was only 23 mAh/g,and the first Coulombic efficiency reached 94.2%.The capacity retention rate was 98.3%after 100 charge-discharge cycles at 0.1 C.

关键词： ethylene tar pitch graphite anode Li-ion batteries

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Analysis of Low-Pressure Operation Stability of Underground Hydrogen Storage Salt Cavern 56

Analysis of Low-Pressure Operation Stability of Underground ...

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56th U.S. rock Mechanics/Geomechanics Symposium

作者： dong, Jingnan Zhuang, Xiaoqian Gong, danni Ban, Fansheng Zhang, Yingbin CNPC Engineering Technology R&D Company Limited Beijing China China University of Petroleum-Beijing Beijing China HydroChina-ITASCA R&D Center Hangzhou China

ISBN: (纸本)9780979497575

In order to meet today's increasing fluctuations in energy demand, large-scale underground salt rock gas storage is widely used in the storage of fuels, including natural gas, oil and hydrogen. From the perspective of macroscopic structure and stratigraphic structure, the Jintan salt deposit in China has good sealing properties, and is an ideal solution mining area for the construction of salt rock gas storage. Salt rock has extremely low permeability and self-repairing properties, which greatly increase the sealing performance of the gas storage. Underground salt cavern hydrogen storage has been proved feasible in some area worldwide. The molecular weight of hydrogen is extremely low, so it has high requirements on the sealing performance of hydrogen storage, especially in terms of long-time storage. In this paper, two geo-mechanical models are established as one single-cavern configuration and 4-cavern configuration to analyze the stability of the hydrogen storage in terms of cavity volume shrinkage, stress distribution of rock mass around caverns, and surface subsidence. Through numerical simulation using FLAC3d, the evolution law under long-time low-pressure conditions is investigated. The tightness and stability of the trap conditions of the salt interval are studied, and the reasonable low operating pressure range of the salt rock hydrogen storage is proposed. The study found that under the condition of ensuring the stability of the salt cavity, the gas storage should keep the operating pressure from 8 MPa to 9 MPa at the depth around 800 to 1000 m. The long-term constant pressure operation at lower and higher limit did not see obvious salt cavity tensile stress concentration areas within 30 years, and the salt cavity expansion area was concentrated in the local area. For most salt cavern hydrogen storages of 800 to 1000 meters depth, 8.27 MPa is an acceptable operational pressure. Considering the surface subsidence, it is necessary to pay more attention when

关键词： Mining

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Proposal and Verification of a Novel doubly-Excited Variable-Flux Consequent Pole Motor

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IEEJ Transactions on Industry Applications 2025年第5期145卷 385-393页

作者： Yokota, Keito Matsushita, Yoshiki Mitsuda, Hiroshi Fukami, Tadashi Koyama, Masato Tanaka, Toshinori Graduate School of Engineering Kanazawa Institute of Technology 7-1 Ohgigaoka Nonoichi921-8501 Japan Advanced Technology R&D Center Mitsubishi Electric Corporation 8-1-1 Tsukaguchi-Honmachi Amagasaki661-8661 Japan Nagoya Works Mitsubishi Electric Corporation 5-1-14 Yadaminami Higashi-ku Nagoya461-8670 Japan

In this paper, we propose a new type of hybrid excited motor called "doubly-excited variable-flux consequent pole motor (deVFCM)". The deVFCM consists of a three-phase double Y-connected armature winding with two neutral points, O1 and O2, and field poles with alternating permanent magnet and iron poles. When a dC voltage for supplying the field current is applied across O1 and O2 in such a configuration, the armature winding also acts as a field winding, and the magnetic flux through the iron poles can be adjusted. To validate the principle of this deVFCM, a prototype machine was fabricated, and the basic characteristics of the prototype machine were investigated through three-dimensional finite element analysis and experiments. The results show that both high torque generation and loss reduction at high speeds can be achieved by adjusting the field current. © 2025 The Institute of Electrical Engineers of Japan.

关键词： Permanent magnets

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