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Empirically evaluating virtual reality’s effect on reservoir engineering tasks

Visual Informatics 2024年第1期8卷 26-46页

作者： Bryson Lawton nanjia wang Steven Samoil Parisa Daeijavad Siqi Xie Zhangxin Chen Frank Maurer Department of Computer Science University of Calgary2500 University Dr NWCalgaryT2N 1N4AlbertaCanada Department of Chemical&Petroleum Engineering University of Calgary2500 University Dr NWCalgaryT2N 1N4AlbertaCanada

To help determine in what ways virtual reality(VR)technologies may benefit reservoir engineering workflows,we conducted a usability study on a prototype VR tool for performing reservoir model analysis *** leveraging the strengths of VR technologies,this tool’s aim is to help advance reservoir analysis workflows beyond conventional methods by improving how one understands,analyzes,and interacts with reservoir model *** evaluate our tool’s VR approach to this,the study presented herein was conducted with reservoir engineering experts who used the VR tool to perform three common reservoir model analysis tasks:the spatial filtering of model cells using movable planes,the cross-comparison of multiple models,and well path *** study found that accomplishing these tasks with the VR tool was generally regarded as easier,quicker,more effective,and more intuitive than traditional model analysis software while maintaining a feeling of low task workload on ***,participants provided positive feedback regarding their experience with using VR to perform reservoir engineering work tasks,and in general,it was found to improve multi-model cross-analysis and rough object manipulation in *** indicates the potential for VR to be better than conventional means for some work tasks and participants also expressed they could see it best utilized as an addition to current software in their reservoir model analysis *** were,however,some concerns voiced when considering the full adoption of VR into their work that would be best first addressed before this took place.

关键词： Immersive analytics Visual analytics Data visualization Reservoir engineering Virtual reality VR

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Granular Ionogel Particle Inks for 3D Printed Tough and Stretchable Ionotronics

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Research 2024年第1期2023卷 429-442页

作者： Yuan Yao Yue Hui Zhenhua wang Hehao Chen Heng Zhu nanjia Zhou Key Laboratory of 3D Micro/Nano Fabrication and Characterization of Zhejiang Province School of EngineeringWestlake UniversityHangzhou 310024Zhejiang ProvinceChina Institute of Advanced Technology Westlake Institute for Advanced StudyHangzhou 310024Zhejiang ProvinceChina School of Chemical Engineering and Advanced Materials the University of AdelaideAdelaide 5005South AustraliaAustralia State Key Laboratory of Fluid Power&Mechatronic System Key Laboratory of Soft Machines and Smart Devices of Zhejiang ProvinceCenter for X-MechanicsDepartment of Engineering MechanicsZhejiang UniversityHangzhou 310027China

Ionogels have garnered great attention as promising soft conducting materials for the fabrication of flexible energy storage devices,soft actuators,and ***,the leakage of the ionic liquids,weak mechanical strength,and poor manufacturability have greatly limited their reliability and ***,we propose a new ionogel synthesis strategy by utilizing granular zwitterionic microparticles to stabilize ionic *** ionic liquids swell the microparticles and physically crosslink microparticles via either electronic interaction or hydrogen *** introducing a photocurable acrylic monomer enables the fabrication of double-network(DN)ionogels with high stretchability(>600%)and ultrahigh toughness(fracture energy>10 kJ/m^(2)).The synthesized ionogels exhibit a wide working temperature of−60 to 90℃.By tuning the crosslinking density of microparticles and physical crosslinking strength of ionogels,we synthesize DN ionogel inks and print them into three-dimensional(3D)*** ionogelbased ionotronics are 3D printed as demonstrations,including strain gauges,humidity sensors,and ionic skins made of capacitive touch sensor *** covalently linking ionogels with silicone elastomers,we integrate the ionogel sensors onto pneumatic soft actuators and demonstrate their capacities in sensing large *** our last demonstration,multimaterial direct ink writing is harnessed to fabricate highly stretchable and durable alternating-current electroluminescent devices with arbitrary *** printable granular ionogel ink represents a versatile platform for the future manufacturing of ionotronics.

关键词： crosslinking utilizing gauge

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基于智慧课堂互动式教学的“生物膜的流动镶嵌模型”教学设计

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生物学教学 2020年第11期45卷 29-31页

作者：王南佳广东省广州市南沙第一中学广州511400

以“生物膜的流动镶嵌模型”为例,尝试将智慧课堂与高中生物学教学深度融合,对高中生物学如何建构“智慧课堂”进行探索与实践。以学生为主体的智慧课堂通过人机多元互动,提高课堂效率,提升教学质量,从而更好地落实学科核心素养的培养。

关键词：智慧课堂人机互动流动镶嵌模型核心素养教学设计高中生物学

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基金经理羊群效应与股票流动性——基于主动型基金的研究

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投资研究 2022年第5期41卷 69-90页

作者：马子喻王楠佳张顺明中国人民大学财政金融学院

不同于现有文献多集中于讨论羊群行为对股票价格和波动性的影响,本文构建一个包含基金经理和散户投资者的三期模型,探究基金经理羊群效应对股票流动性的影响机制。我们通过均衡求解发现,基金经理羊群行为降低了风险资产投资,股票流动性... 详细信息

不同于现有文献多集中于讨论羊群行为对股票价格和波动性的影响,本文构建一个包含基金经理和散户投资者的三期模型,探究基金经理羊群效应对股票流动性的影响机制。我们通过均衡求解发现,基金经理羊群行为降低了风险资产投资,股票流动性下降。本文还使用2005-2020年我国股票市场中主动型基金投资股票的数据实证检验,发现基金经理存在羊群行为,该行为导致股票流动性下降。

关键词：羊群效应流动性清算比率主动型基金

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北派藏医的主要特色学术探析

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中华中医药杂志 2024年第7期39卷 3774-3777页

作者：才让南加西藏藏医药大学拉萨850000

文章从北派藏医的传承历史及学术特色进行探析,认为北派藏医源发于拉堆绛地区,在学术上注重藏医药本草理论的完善及高原地区优势病种的研究、特有验方的研制。在历史的发展长河中,相继涌现了强巴·南杰扎桑《论述续注·甘露源流》、强... 详细信息

文章从北派藏医的传承历史及学术特色进行探析,认为北派藏医源发于拉堆绛地区,在学术上注重藏医药本草理论的完善及高原地区优势病种的研究、特有验方的研制。在历史的发展长河中,相继涌现了强巴·南杰扎桑《论述续注·甘露源流》、强巴·迷尼玛通瓦顿旦《本草药库》及强巴·索南益西坚参《大疏无垢光明》和隆敦·杜孜居美《藏医如意大全》等重要经典。为藏医药在西藏地区的可持续发展及在蒙古地区的传播中起到重要作用。希翼通过对北派藏医主要特色学术进行探析,以进一步推动藏医特色学派的挖掘及发展、特色验方的挖掘分析。

关键词：北派藏医传承学术特色《本草药库》《大疏无垢光明》《藏医如意大全》藏医药学派

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加珠的本草考证研究

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中国现代应用药学 2024年第6期41卷 839-846页

作者：才让南加占堆西藏藏医药大学拉萨850000

通过查阅相关藏医经典记载,对藏医药中入药加珠的异名、基原、药用部位及加工炮制进行考证。经考证可知,《藏多医学札记》始载加珠,常出现的异名为曼珠。现代以来,加珠出现了8种基原,大都与典籍记载未考证、地方习用、药材市场影响混杂... 详细信息

通过查阅相关藏医经典记载,对藏医药中入药加珠的异名、基原、药用部位及加工炮制进行考证。经考证可知,《藏多医学札记》始载加珠,常出现的异名为曼珠。现代以来,加珠出现了8种基原,大都与典籍记载未考证、地方习用、药材市场影响混杂等相关。依据藏医经典中加珠的记载特征及实地调研、群众咨询后已发现加珠是西藏腹地特有的蛇类物种,并且是全世界唯一能生活在海拔>4 000 m的蛇类——温泉蛇。药用部位的变化是由眼睛转变为头部及头尾齐全的全身入药;加工炮制方式由多样性转变为规范性,以现通用的2006年原西藏自治区食品药品监督管理局编写的《藏药材炮制规范》为准。

关键词：藏药加珠本草考证基原药用部位加工炮制

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Steady-state coupled analysis of flowfields and thermochemical erosion of C/C nozzles in hybrid rocket motors

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Science China(Technological Sciences) 2015年第3期58卷 574-586页

作者： ZHAO Sheng TIAN Hui wang PengFei YU nanjia CAI GuoBiao School of Astronautics Beihang University

A hybrid rocket can be used in various applications and is an attractive propulsion system. However, serious erosion of nozzles is common in motor firing operations, which could restrict the application of hybrid rocket motors. Usually, the serious erosion is attributed to the high concentration of oxidizing species in hybrid motors, while the details of flowfields in the motors are not paid special attention to. In this paper, first the thermochemical erosion of C/C nozzle is simulated coupled with the flowfields in a 98% H2O2/hydroxyl-terminated polybutadiene（HTPB） hybrid rocket motor. The simulation is made on a typical axisymmetric motor, including a pre-combustion chamber, an aft-combustion chamber and nozzle structures. Thermochemica reactions of H2 O, CO2, OH, O and O2 with C are taken into account. Second, the change of flowfields due to fuel regression during motor firing operations is considered. Nozzle erosion in different flowfields is evaluated. Third, the results of nozzle erosion in the coupled simulation are compared with those under uniform and chemical equilibrium flow and motor firing test results. The results of simulation and firing tests indicate that the thermochemical erosion of nozzles in hybrid motors should be calculated coupled with flowfields in the motor. In uniform and chemical equilibrium flowfields, the erosion rate is overestimated. The diffusion flame in hybrid motors protects the nozzle surface from the injected oxidizer and high temperature products in flowfields, leading to a relatively fuel-rich environment above the nozzle. The influence of OH and the geometry of motor should also be considered in the evaluation of nozzle erosion in hybrid motors.

关键词： hybrid rocket motor C/C nozzle thermochemical erosion

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Smart bioelectronics and biomedical devices

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Bio-Design and Manufacturing 2022年第1期5卷 1-5页

作者： nanjia Zhou Liang Ma Key Laboratory of 3D Micro/Nano Fabrication and Characterization of Zhejiang Province School of EngineeringWestlake UniversityHangzhou 310024China Institute of Advanced Technology Westlake Institute for Advanced StudyHangzhou 310024China State Key Laboratory of Fluid Power and Mechatronic Systems Zhejiang UniversityHangzhou 310058China School of Mechanical Engineering Zhejiang UniversityHangzhou 310058China

The development of smart bioelectronics and biomedical devices has significantly advanced the field of biomedical engineering,enabling a myriad of applications from basic biomedical research to clinical medicine and *** at the intersection of materials science,mechanical,electrical,and bioengineering,this fascinating field has attracted considerable attention from researchers all over the world,providing new healthcare solutions which were impossible *** brain–machine interface to biomedical nano/micro-robots,different materials and manufacturing methodologies have been developed to advance the functionalities of the bioelectronic systems to meet the ever-increasing demand of biological and bioinspired applications(Fig.1).

关键词： Smart interface electrical

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Geometric effects of fuel regression rate in hybrid rocket motors

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Science China(Technological Sciences) 2016年第5期59卷 807-813页

作者： CAI GuoBiao ZHANG YuanJun wang PengFei HUI Tian ZHAO Sheng YU nanjia School of Astronautics Beihang University Beijing 100191 China Beijing Institute of Aerospace Systems Engineering Beijing 100076 China

The geometric configuration of the solid fuel is a key parameter affecting the fuel regression rate in hybrid rocket motors. In this paper, a semi-empirical regression rate model is developed to investigate the geometric effect on the fuel regression rate by incorporating the hydraulic diameter into the classical model. The semi-empirical model indicates that the fuel regression rate decreases with increasing hydraulic diameter and is proportional to dh?0.2 when convective heat transfer is dominant. Then a numerical model considering turbulence, combustion, solid fuel pyrolysis, and a solid–gas coupling model is established to further investigate the geometric effect. Eight motors with different solid fuel grains are simulated, and four methods of scaling the regression rate between different solid fuel grains are compared. The results indicate that the solid fuel regression rates are approximate the same when the hydraulic diameters are equal. The numerical results verify the accuracy of the semi-empirical model.

关键词： geometric effect regression rate hydraulic diameter hybrid rocket motor

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Investigation of non-premixed flame combustion characters in GO_2/GH_2 shear coaxial injectors using non-intrusive optical diagnostics

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Science China(Physics,Mechanics & Astronomy) 2015年第12期58卷 167-179页

作者： DAI Jian YU nanjia CAI GuoBiao Beijing University of Aeronautics and Astronautics

Single-element combustor experiments are conducted for three shear coaxial geometry configuration injectors by using gaseous oxygen and gaseous hydrogen(GO2/GH2) as propellants. During the combustion process, several spatially and time- resolved non-intrusive optical techniques, such as OH planar laser induced fluorescence(PLIF), high speed imaging, and infrared imaging, are simultaneously employed to observe the OH radical concentration distribution, flame fluctuations, and temperature fields. The results demonstrate that the turbulent flow phenomenon of non-premixed flame exhibits a remarkable periodicity, and the mixing ratio becomes a crucial factor to influence the combustion flame length. The high speed and infrared images have a consistent temperature field trend. As for the OH-PLIF images, an intuitionistic local flame structure is revealed by single-shot instantaneous images. Furthermore, the means and standard deviations of OH radical intensity are acquired to provide statistical information regarding the flame, which may be helpful for validation of numerical simulations in future. Parameters of structure configurations, such as impinging angle and oxygen post thickness, play an important role in the reaction zone distribution. Based on a successful flame contour extraction method assembled with non-linear anisotropic diffusive filtering and variational level-set, it is possible to implement a fractal analysis to describe the fractal characteristics of the non-premixed flame contour. As a result, the flame front cannot be regarded as a fractal object. However, this turbulent process presents a self-similarity characteristic.

关键词： liquid rocket engine shear coaxial injector non-intrusive optical techniques image segmentation fractal analysis

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