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Comparison of Passive and Active Fiducials for Optical Tracking 用于光学跟踪的无源和有源基准的比较
IF 0.6 Q4 PHYSICS, APPLIED Pub Date : 2022-10-01 DOI: 10.2478/lpts-2022-0040
J. Odmins, K. Slics, R. Fenuks, E. Linina, K. Osmanis, I. Osmanis
Abstract The paper analyses the constraints related to optical tracking of an HMD with a single commercial binocular stereoscopic optical tracking system and offers an overview of different factors affecting the best active fiducial set-up and marker geometries for reliable tracking with a focus on the rotational accuracy of a marker. Two IR diode models with different emission characteristics were tested as active fiducials and the results were compared to localization accuracy of passive fiducials. In terms of preferable marker geometry, it was found that the area enclosed by the fiducials should be maximized. Thus, due to geometrical constraints, very small marker geometries may not be stable or feasible entirely. Rotational accuracy was analysed for cases when the marker was not directly facing the tracking device and it was found that rotation about one axis introduced errors to the determined orientation in space related to the other axes as well.
摘要:本文分析了单个商用双目立体光学跟踪系统对HMD光学跟踪的制约因素,概述了影响可靠跟踪的最佳主动基准设置和标记几何形状的不同因素,重点讨论了标记的旋转精度。对两种不同发射特性的红外二极管模型作为主动基准进行了测试,并将测试结果与被动基准的定位精度进行了比较。在优选标记几何方面,发现由基准包围的面积应最大化。因此,由于几何约束,非常小的标记几何可能不是完全稳定或可行的。对标记不直接面对跟踪装置的情况下的旋转精度进行了分析,发现围绕一个轴的旋转也会给与其他轴相关的空间确定方向带来误差。
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引用次数: 0
Oxygen Mass Transfer Coefficient Application in Characterisation of Bioreactors and Fermentation Processes 氧传质系数在生物反应器和发酵过程表征中的应用
IF 0.6 Q4 PHYSICS, APPLIED Pub Date : 2022-10-01 DOI: 10.2478/lpts-2022-0038
J. Vanags, A. Suleiko
Abstract This review article covers the topics of evaluation and experimental determination of oxygen mass transfer coefficients (kLa) for their application in characterising bioreactors and fermentations processes. The article provides a comparison of different experimental approaches for determining kLa in bioreactors. Additionally, the influence of bioreactor design and fermentation parameters on kLa is discussed. The aim of the article is to provide useful information regarding the approaches for selecting bioreactors and their working regimes to achieve optimal fermentation results.
摘要本文综述了氧传质系数(kLa)在生物反应器和发酵过程表征中的应用。本文对生物反应器中测定kLa的不同实验方法进行了比较。此外,还讨论了生物反应器设计和发酵参数对kLa的影响。本文的目的是提供有关选择生物反应器的方法及其工作机制的有用信息,以获得最佳发酵结果。
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引用次数: 0
Influence of Internal Gas Pipelines Built into the Structure on the Safety of Residents and Energy Eficiency Factors of the Building 建筑内建燃气管道对居民安全及建筑节能系数的影响
IF 0.6 Q4 PHYSICS, APPLIED Pub Date : 2022-10-01 DOI: 10.2478/lpts-2022-0039
A. Romānovs, J. Tihana, N. Kondrahins
Abstract With an emphasis on the visual appearance of buildings, surface and internal gas pipelines are being built into structures and walls, which can affect system serviceability and occupant safety. When placing gas pipelines in a closed room (shafts, ducts, facade structures, etc.) there is a risk that in case of leakage, natural gas will accumulate in the room, which together with the ambient air, within the specified concentration limits, forms an explosive mixture. The present paper analyses the built-in internal gas pipeline systems, their installation norms, operation and maintenance problems in different types of buildings. It is shown that requirements do not cover all possible gas pipeline installation options. The analysis of the gas supply system operator shows that non-compliance with the applicable norms has been identified in every third of the 400,000 gas consumers in Latvia in the surface and internal gas pipeline system. To improve and develop safety requirements, it is planned to perform an experiment that is described in detail in this paper. Pre-experimental calculations are made to set reference points in the study and find the main influencing parameters on gas leakage process.
摘要为了强调建筑物的视觉外观,表面和内部的天然气管道正在被建造成结构和墙壁,这可能会影响系统的可用性和居住者的安全。当将天然气管道放置在封闭的房间(竖井、管道、立面结构等)中时,如果发生泄漏,天然气将积聚在房间中,在规定的浓度范围内,天然气与环境空气一起形成爆炸性混合物。本文分析了不同类型建筑的内置式内部燃气管道系统及其安装规范、运行维护问题。结果表明,要求并未涵盖所有可能的天然气管道安装选项。对天然气供应系统运营商的分析表明,拉脱维亚地面和内部天然气管道系统的40万天然气用户中,每三分之一的用户都不符合适用规范。为了改进和发展安全要求,计划进行一项实验,本文对此进行了详细描述。通过实验前的计算,设定了研究的参考点,找出了影响气体泄漏过程的主要参数。
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引用次数: 0
Mathematical Model for Household Off-Grid Simulation (Off-Grid System Sizing) 家庭离网仿真数学模型(离网系统分级)
IF 0.6 Q4 PHYSICS, APPLIED Pub Date : 2022-08-01 DOI: 10.2478/lpts-2022-0029
E. Groza, K. Gičevskis, O. Linkevičs, S. Ķiene
Abstract The paper presents the results of the research, which was initiated in our previous publication. The main goal of the research is to develop and validate our own multi-objective simulation tool for determination of optimal mix and sizing of off-grid and grid-connected microgrid systems. The first version of the developed model was tailored specifically for simulation of household off-grid system, which consisted of solar photovoltaics (PV), micro wind turbine, electric batteries, and backup power generator. Proposed algorithms are based on simulation of mentioned resources and hourly electric loads of off-grid system with the objective to reduce unsupplied energy volumes and total system costs. Several alternatives were considered with different configurations of the off-grid system and dispatching strategies of available resources. The developed model was validated with calculations of real off-grid system and results were compared to those, which were made in the previous publication, using Homer Pro software.
本文介绍了我们在之前的出版物中发起的研究结果。该研究的主要目标是开发和验证我们自己的多目标仿真工具,以确定离网和并网微电网系统的最佳组合和规模。开发的模型的第一个版本是专门为模拟家庭离网系统量身定制的,该系统由太阳能光伏发电(PV)、微型风力涡轮机、电池和备用发电机组成。本文提出的算法是基于对上述资源和离网系统小时电力负荷的仿真,目的是减少未供应的能量量和系统总成本。考虑了离网系统的不同配置和可用资源的调度策略。通过实际离网系统的计算验证了所建立的模型,并使用Homer Pro软件将结果与之前发表的结果进行了比较。
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引用次数: 0
The Green Hydrogen and the EU Gaseous Fuel Diversification Risks 绿色氢与欧盟气体燃料多元化风险
IF 0.6 Q4 PHYSICS, APPLIED Pub Date : 2022-08-01 DOI: 10.2478/lpts-2022-0033
L. Jansons, L. Zemite, N. Zeltiņš, I. Bode, I. Geipele, K. Kiesners
Abstract Hydrogen is the most abundant chemical element on the Earth, and it has really a wide variety of applications, starting from use in refining, petrochemical industry, steel manufacturing, and ending with use in energy production and renewable gas (hereinafter – RG) blending for gradual replacement of natural gas in all sectors of the national economy. Being practically emission-free, if produced in sustainable way or from renewable energy sources (hereinafter – RES), hydrogen is regarded as one of the most promising energy sources for decarbonisation of practically the entire segment of industrial and energy production. Growing pressure of the European climate neutrality targets has triggered special interest in production, use, storage and transportation of hydrogen – especially the green one, which can be used in at least four fundamental ways: as a basic material, a fuel, an energy carrier and an energy storage medium. In the context of sector coupling, however, hydrogen facilitates decarbonisation of those industrial processes and economic sectors in which carbon dioxide (hereinafter – CO2) emissions can either not be reduced by electrification or this reduction would be minimal and linked to very high implementation costs. At the same time, development of an extensive hydrogen economy is the key to the achievement of the European climate protection targets, with the European Commission’s (hereinafter – EC) Hydrogen Strategy, a framework created in 2020 to develop and promote sustainable hydrogen economy in the European Union (hereinafter – EU), in its centre. Green hydrogen also will take its legitimate place in the gaseous fuel diversification risk management strategy, as this gaseous fuel is not only one of the most perspective future energy sources, but also one of the most volatile and demanding sources. In the process of gaseous fuel diversification in the EU and worldwide, new logistical chains and supply – demand networks of green hydrogen will emerge. Therefore, adequate addressing of potential challenges of this new regional and global production, delivery and consumption framework will be of utmost importance for secure, safe and predictable functioning of future energy systems.
氢是地球上最丰富的化学元素,它的应用范围非常广泛,从炼油、石油化工、钢铁制造到能源生产和可再生气体(以下简称RG)混合,在国民经济的各个部门逐步取代天然气。氢气实际上是零排放的,如果以可持续的方式或使用可再生能源(以下简称“可再生能源”)生产,它被认为是几乎整个工业和能源生产领域脱碳最有前途的能源之一。欧洲气候中和目标日益增长的压力引发了人们对氢的生产、使用、储存和运输的特殊兴趣——尤其是绿色氢,它至少可以以四种基本方式使用:作为基本材料、燃料、能量载体和能量储存介质。然而,在部门耦合的背景下,氢促进了那些工业过程和经济部门的脱碳,在这些工业过程和经济部门中,二氧化碳(以下简称- CO2)排放要么不能通过电气化减少,要么这种减少将是最小的,并且与非常高的实施成本相关。与此同时,发展广泛的氢经济是实现欧洲气候保护目标的关键,以欧盟委员会(以下简称EC)氢战略为中心,该战略是2020年创建的一个框架,旨在发展和促进欧盟(以下简称EU)的可持续氢经济。绿色氢也将在气体燃料多样化风险管理战略中占据合法地位,因为这种气体燃料不仅是最有前景的未来能源之一,也是最不稳定和需求最大的能源之一。在欧盟和世界范围内气体燃料多样化的过程中,新的绿色氢物流链和供需网络将会出现。因此,充分解决这一新的区域和全球生产、交付和消费框架的潜在挑战,对于未来能源系统的可靠、安全和可预测的功能至关重要。
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引用次数: 5
Analysis of Test Results of the Developed Synchronous Reluctance Motor for Public Transport Application 研制的公共交通用同步磁阻电动机试验结果分析
IF 0.6 Q4 PHYSICS, APPLIED Pub Date : 2022-08-01 DOI: 10.2478/lpts-2022-0032
K. Gulbis, U. Brakanskis, E. Kamoliņš, M. Gorobecs, A. Potapovs, K. Sejejs, J. Zarembo, V. Burenin
Abstract The paper describes the design and control method of the synchronous reluctance machine with improved efficiency compared to traction induction motor for electric vehicle application. Magnetic field finite element modelling is used in the design process. The paper presents load characteristics calculation method for the design process, considering the cross magnetic saturation effect. Control algorithm with constant d-axis current control method is developed in the research. The prototype of the machine is constructed and tested.
摘要:本文介绍了电动汽车用同步磁阻电机的设计和控制方法,与牵引感应电机相比,同步磁阻电机的效率有所提高。在设计过程中采用了磁场有限元建模。在设计过程中,提出了考虑交叉磁饱和效应的负载特性计算方法。研究中提出了恒d轴电流控制方法的控制算法。这台机器的原型已经制造出来并进行了测试。
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引用次数: 3
Analysis of Remotely Piloted Aircraft Payload for Oil Spill Detection 用于漏油探测的遥控飞机有效载荷分析
IF 0.6 Q4 PHYSICS, APPLIED Pub Date : 2022-08-01 DOI: 10.2478/lpts-2022-0034
V. Zavtkevics, M. Urbaha
Abstract Operational monitoring of large sea aquatorium areas with the aim of detecting and controlling oil pollution is now carried out using various technological systems, such as satellite remote sensing, sea-going vessels, various aircraft and remotely piloted aircraft (RPA). Currently, the use of RPA for the fulfilment of monitoring tasks in the aquatorium is being intensively developed and can eliminate problems of remote sensing performed by satellites and piloted aircraft, such as short presence in the monitoring area, very long delay of information (up to 48 hours) and low quality of imagery. This paper presents mathematical modelling of RPA multi-sensor pay-loads for oil spill detection, monitoring and control. Information obtained from payload sensors is critical for increasing effectiveness of detection and monitoring of oil spills. Nowadays, many types of sensors are used for oil spill detection and monitoring. The most common sensors for detection of oil pollution are optical, multispectral, hyperspectral, thermal and laser fluorometers. Some oil pollution detection sensors have limitations, such as false alarm, only daytime operation, weather restrictions. Airborne remote sensors cannot provide all information required for detection of and response to oil spills, and water quality monitoring in the spill area. A model for selecting sensors for multi sensor payload that will make it possible to optimize the application of RPA for oil spill detection was developed. The RPA payload can be increased/reduced to the greatest possible extent with the help of different types of equipment at various parameters. The mathematical model of the integrated payload considers detection capability of sensors, weather conditions, sensor characteristics, and false alarm rate. The optimal multi-sensor payload will optimize the application of RPA for oil spill detection and monitoring.
摘要为了检测和控制石油污染,目前正在使用各种技术系统,如卫星遥感、海船、各种飞机和遥控飞机,对大型海水养殖区进行操作监测。目前,正在大力开发使用RPA来完成水族馆的监测任务,可以消除卫星和有人驾驶的飞机进行遥感的问题,例如监测区域存在时间短、信息延迟很长(长达48小时)和图像质量低。本文介绍了用于漏油检测、监测和控制的RPA多传感器有效载荷的数学模型。从有效载荷传感器获得的信息对于提高石油泄漏检测和监测的有效性至关重要。如今,许多类型的传感器被用于漏油检测和监测。用于检测石油污染的最常见传感器是光学、多光谱、高光谱、热和激光荧光计。一些油污染检测传感器有局限性,如误报、仅在白天操作、天气限制。机载遥感器无法提供检测和应对石油泄漏以及泄漏区域水质监测所需的所有信息。开发了一个为多传感器有效载荷选择传感器的模型,该模型将有可能优化RPA在漏油检测中的应用。在不同参数的不同类型设备的帮助下,RPA有效载荷可以最大限度地增加/减少。集成有效载荷的数学模型考虑了传感器的检测能力、天气条件、传感器特性和误报率。最佳的多传感器有效载荷将优化RPA在漏油检测和监测中的应用。
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引用次数: 0
Development Solutions of Riga City Local Geodetic Network 里加市地方大地测量网的开发解决方案
IF 0.6 Q4 PHYSICS, APPLIED Pub Date : 2022-08-01 DOI: 10.2478/lpts-2022-0035
A. Celms, J. Kaminskis, J. Akmentins, I. Vārna
Abstract Throughout the centuries, Riga has been the city with dynamic development. Its territory has unceasingly expanded, whereby previously unused territories have been urbanized. Managers of the city understood already at the end of 19th century that unified geodetic network had great importance in the development of the city. Since then, Riga’s local geodetic network has evolved with the city, several coordinate and height systems have been replaced, but the task has remained the same – to provide a flawless, homogeneous geodetic foundation for various surveying activities. In 2018, the development of the local geodetic network in several parts of the city was completed, whereby the problem arose – altitude values of surveyed terrain points determined by using the improved geodetic network did not coincide with altitude values determined using the GNSS method. Considering the above-mentioned problem, the objectives of this study were set: to plan and carry out control measurements of the improved local geodetic network in the vicinity of Grizinkalns, to provide analysis of the obtained results and recommendations for further development of a local geodetic network. The difference between the heights determined by the geometric levelling method and the heights determined by the GNSS method shall not exceed 2 mm. According to the GNSS method, using the quasi-geoid model LV’14 v2, the determined heights of the geodetic grid points differ from the given ones by 0.062 m on average. The differences are systematic. To overcome these differences, the quasi-geoid model needs to be refined.
摘要几个世纪以来,里加一直是一座充满活力发展的城市。它的领土不断扩大,以前未使用的领土被城市化了。19世纪末,城市管理者就已经认识到,统一的大地测量网对城市的发展具有重要意义。从那时起,里加的地方大地测量网络随着城市的发展而发展,几个坐标和高度系统被替换,但任务仍然不变——为各种测量活动提供完美、均匀的大地测量基础。2018年,该市多个地区的地方大地测量网络开发完成,由此出现了问题——使用改进的大地测量网络确定的测量地形点的海拔值与使用GNSS方法确定的海拔值不一致。考虑到上述问题,本研究的目标是:规划和实施Grizinkalns附近改进的局部大地测量网的控制测量,对获得的结果进行分析,并为进一步开发局部大地测量网络提供建议。几何水准测量法确定的高度与全球导航卫星系统方法确定的高度之间的差异不得超过2 mm。根据全球导航卫星体系方法,使用准大地水准面模型LV’14 v2,测地网格点的确定高度与给定高度平均相差0.062 m。差异是系统性的。为了克服这些差异,需要对拟大地水准面模型进行改进。
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引用次数: 0
Energy Transport in SiO2 Crystals: Luminescence Excitation Spectra of Stishovite and α-Quartz SiO2晶体中的能量输运:辉长石和α-石英的发光激发光谱
IF 0.6 Q4 PHYSICS, APPLIED Pub Date : 2022-08-01 DOI: 10.2478/lpts-2022-0030
A. Trukhin
Abstract The migration of elementary electronic excitations was studied in a single crystal of stishovite and compared with migration in a crystal of α-quartz and polycrystalline stishovite powder. The research method is based on comparing the transfer of absorbed energy to luminescence centers, used as detectors of quasiparticles, and the near-surface nonradiative annihilation of electronic excitations. A sign of migration is the appearance of some minima in the photoluminescence (PLE) excitation spectrum in the region of maxima in the intrinsic absorption spectrum. The PLE spectrum of stishovite contains the first minimum at 9.8 eV, indicating the migration of electronic excitations and the existence of an intrinsic absorption band in stishovite at 9.8 eV. In α-quartz, the first minimum in the PLE spectrum is located at 10.5 eV and corresponds well to the intrinsic absorption band of the exciton.
摘要研究了元素电子激发在锑铁矿单晶中的迁移,并与α-石英和多晶锑铁矿粉末中的迁移进行了比较。该研究方法基于比较吸收的能量向用作准粒子探测器的发光中心的转移,以及电子激发的近表面非辐射湮灭。迁移的迹象是在本征吸收光谱的最大值区域中,在光致发光(PLE)激发光谱中出现一些最小值。硫锑石的PLE光谱在9.8eV处包含第一个最小值,表明电子激发的迁移和硫锑石在9.8 eV处存在本征吸收带。在α-石英中,PLE光谱中的第一个最小点位于10.5 eV处,与激子的本征吸收波段很好地对应。
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引用次数: 0
Development of Liquid Crystal Layer Thickness and Refractive Index Measurement Methods for Scattering Type Liquid Crystal Displays 散射型液晶显示器液晶层厚度和折射率测量方法的发展
IF 0.6 Q4 PHYSICS, APPLIED Pub Date : 2022-08-01 DOI: 10.2478/lpts-2022-0031
A. Ozols, G. Mozolevskis, R. Žalubovskis, M. Rutkis
Abstract We report the measuring method of scattering type display liquid crystal layer thickness based on capacitance values suitable for inline production process control. The method is selected for its effectiveness and simplicity over spectroscopic methods as conventional methods for scattering type displays are not applicable. During the method approbation process, a novel diffuser liquid crystal mixture refractive index was determined based on liquid crystal layer thickness measurement data.
摘要提出了一种基于电容值的散射式显示液晶层厚度的测量方法,该方法适用于在线生产过程控制。选择该方法是因为它比光谱方法更有效和简单,因为传统的散射型显示方法不适用。在方法验证过程中,根据液晶层厚度测量数据,确定了一种新型扩散器液晶混合折射率。
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引用次数: 0
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Latvian Journal of Physics and Technical Sciences
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