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Journal articles on the topic 'FEM Cloud'

Author: Grafiati

Published: 4 June 2021

Last updated: 18 February 2022

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1

Biel, Damian, and Tomasz Lipecki. "Headframe modelling accuracy for finite element method analysis purposes." Reports on Geodesy and Geoinformatics 106, no. 1 (2018): 19–24. http://dx.doi.org/10.2478/rgg-2018-0010.

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Abstract Nowadays, the growing popularity of terrestrial laser scanners (TLS) allows to obtain a point cloud of many industrial objects along with classic surveying. However, the quality and model’s accuracy in comparison to a real shape seem to be a question, that must be further researched. It is crucial especially for Finite Element Method (FEM) analysis, which, being a part of technical design, estimate the values of construction’s dislocation and deformation. The article describes objects such as headgear with steel support and 4-post headframe with steel sheers. Both supports and sheers

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Quattrini, R., F. Clementi, A. Lucidi, S. Giannetti, and A. Santoni. "FROM TLS TO FE ANALYSIS: POINTS CLOUD EXPLOITATION FOR STRUCTURAL BEHAVIOUR DEFINITION. THE SAN CIRIACO’S BELL TOWER." ISPRS - International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences XLII-2/W15 (August 26, 2019): 957–64. http://dx.doi.org/10.5194/isprs-archives-xlii-2-w15-957-2019.

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<p><strong>Abstract.</strong> In the last few years, the evolution of acquisition techniques allowed to acquire reality-based models increasing accurate and rich of information. On the contrary, the ability to exploit the acquired data in the most efficient, economic (in terms of invested time), and impartial way (in terms of arbitrary choices of the operator) represents the most significant gap. Interoperability theme between points cloud and informative systems becomes relevant. Excellent results were achieved in 3D data exploitation in HBIM and GIS environments, as well as

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Fang, J. W., Z. Sun, and Y. R. Zhang. "TLS-FEM INTEGRATED STRUCTURAL DEFORMATION ANALYSIS ON THE BEAMLESS HALL AT NANJING, CHINA." International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences XLVI-M-1-2021 (August 28, 2021): 215–20. http://dx.doi.org/10.5194/isprs-archives-xlvi-m-1-2021-215-2021.

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Abstract. A method integrating terrestrial laser scanning (TLS) and finite element modelling (FEM) is proposed in this study. It aims at assessing the structural deformation of a historic brick-masonry building, the Beamless Hall at Linggu Temple in Nanjing, China. The building was composed of a series of vaults and arches, the largest among whom spans over 11m. TLS (Z+F Imager5010X) was used to collect 3D point cloud with high density. Point slices and geometric feature computation (verticality) were employed to detect geometric displacement quantitatively and intuitively. FEM-simulation was

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Wałach, Daniel, and Grzegorz Piotr Kaczmarczyk. "Application of TLS Remote Sensing Data in the Analysis of the Load-Carrying Capacity of Structural Steel Elements." Remote Sensing 13, no. 14 (2021): 2759. http://dx.doi.org/10.3390/rs13142759.

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This paper proposes the use of terrestrial laser scanning (TLS) measurements together with finite element method (FEM) numerical modeling to assess the current technical condition. The main aim of the paper was to evaluate the effect of point cloud size reduction on the quality of the geometric model and the ability to represent the corrosion level in assessing its load-carrying capacity. In this study, a standard scanning was performed on a historical object and a point cloud of a selected corroded element was generated. In order to further process the data, gradual reductions were made in th

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Štalmach, Ondrej, Alžbeta Sapietová, Vladimír Dekýš, Peter Šulka, and Lukáš Gajdoš. "Conversion of data from the laser scanner to the Ansys Workbench." MATEC Web of Conferences 254 (2019): 02003. http://dx.doi.org/10.1051/matecconf/201925402003.

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This paper deals with the data processing in the form of a cloud of points scanned using a handheld 3D laser scanner. The aim of this paper is to use this data to create a representative FEM model and compare two different approaches while one of them involves creating a CAD model and the other one not. The data processing is carried out in the freeware systems MeshLab and Meshmixer and FEM analysis in the software ANSYS Workbench.

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Barazzetti, Luigi, Fabrizio Banfi, Raffaella Brumana, Gaia Gusmeroli, Mattia Previtali, and Giuseppe Schiantarelli. "Cloud-to-BIM-to-FEM: Structural simulation with accurate historic BIM from laser scans." Simulation Modelling Practice and Theory 57 (September 2015): 71–87. http://dx.doi.org/10.1016/j.simpat.2015.06.004.

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Feng, De Zhen, Hao Feng Luan, and Ran Zhao. "FEM Strength Analysis on the Main Structure of Modular Mechanical Water Treatment Plant." Advanced Materials Research 588-589 (November 2012): 208–11. http://dx.doi.org/10.4028/www.scientific.net/amr.588-589.208.

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The modular mechanical water treatment plant is a kind of new technology in present. The new technology has changed the work way of conventional water plants and got very wide use in practice. According to characteristics of the modular mechanical water treatment equipment, the paper analyzed the strength of the main mechanical structure, compared the stress and deformation, presented the stress and strain cloud picture. Finally, the paper combined theory with practice and improved and optimized the design plan.

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Wen, Feng, Chen Han, Qiang Li, et al. "Research on Coil Identification Algorithm of Wireless Power Transfer System Based on Magnetic Field Features." World Electric Vehicle Journal 12, no. 3 (2021): 140. http://dx.doi.org/10.3390/wevj12030140.

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In the practical application of wireless power transfer (WPT), the identification of the secondary coil and the analysis of the space magnetic field of the coil will affect the matching scheme of the coil, which will further affect the performance of energy transmission. At present, the establishment of the coil space magnetic field model mainly adopts the finite element method (FEM). The accuracy of the results is limited by the computer performance and the specific settings during calculation, which usually takes a long time. Additionally, it can only analyze and establish the space magnetic

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Ding, Hui, Xian Xu, and Yaozhi Luo. "Generating Free-Form Grid Truss Structures from 3D Scanned Point Clouds." Mathematical Problems in Engineering 2017 (2017): 1–12. http://dx.doi.org/10.1155/2017/5818627.

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Reconstruction, according to physical shape, is a novel way to generate free-form grid truss structures. 3D scanning is an effective means of acquiring physical form information and it generates dense point clouds on surfaces of objects. However, generating grid truss structures from point clouds is still a challenge. Based on the advancing front technique (AFT) which is widely used in Finite Element Method (FEM), a scheme for generating grid truss structures from 3D scanned point clouds is proposed in this paper. Based on the characteristics of point cloud data, the search box is adopted to r

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Jo, Hyeon Cheol, Hong-Gyoo Sohn, and Yun Mook Lim. "A LiDAR Point Cloud Data-Based Method for Evaluating Strain on a Curved Steel Plate Subjected to Lateral Pressure." Sensors 20, no. 3 (2020): 721. http://dx.doi.org/10.3390/s20030721.

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Structural health monitoring (SHM) and safety assessment are very important areas for evaluating the behavior of structures. Various wired and wireless sensors can measure the physical responses of structures, such as displacement or strain. One recently developed wireless technique is a light imaging detection and ranging (LiDAR) system that can remotely acquire three-dimensional (3D) high-precision coordinate information using 3D laser scanning. LiDAR systems have been previously used in geographic information systems (GIS) to collect information on geography and terrain. Recently, however,

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Sikorska-Czupryna, Sylwia, and Aleksander Mazurkow. "The Use of Reverse Engineering to Create FEM Model of Spiroid Gears." Advances in Manufacturing Science and Technology 44, no. 3 (2020): 71–73. http://dx.doi.org/10.2478/amst-2019-0013.

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AbstractThis paper describes the process of creating a digital model of spiroid gears used in the defense industry. This is where the precise measurement of the parts with the highest requirements for accuracy is of great importance The construction of a computational model of a physical object was carried out using an optical three-dimensional scanner. Based on the cloud of points obtained in the process of scanning, a spatial digital model reflecting the geometry of an existing element was developed. Polygonization and mesh reconstruction allowed to create a finite element method model that

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Zhou, De Xin, Xue Qian Tang, and Xiang Lin Zhan. "Modeling Study of a Linear Ultrasonic Phased Array Transducer." Applied Mechanics and Materials 441 (December 2013): 470–75. http://dx.doi.org/10.4028/www.scientific.net/amm.441.470.

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A numerical simulation model based on the finite element method (FEM) and wave analysis is proposed to study the acoustic field of a linear instructions and ultrasonic phased array (LUPA) transducer. The ultrasonic wave propagation in the isotropic solid is studied. The delay law controlling for electronic scanning of a LUPA transducer is analyzed. The ultrasonic wave propagation in the inspection material can be visualized in the form of displacement cloud images by FEM modeling. Experiments show that the model can efficiently and accurately predict the radiation field of beam focusing, steer

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Hou, Rong Guo, Chuan Zhen Huang, Hong Tao Zhu, Jun Wang, and Huan Yang. "A Study of the Interaction between Abrasive Waterjet and Target by CFD and FEM Method." Key Engineering Materials 748 (August 2017): 275–79. http://dx.doi.org/10.4028/www.scientific.net/kem.748.275.

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The interaction between abrasive waterjet and target is studied by computational fluid dynamics (CFD) and finite element method (FEM). The flow field inside and outside abrasive waterjet (AWJ) nozzle is obtained by CFD software. Then the pressure distribution of the fluid on the target is plotted, which is in well agreement with the force distribution of the AWJ impacting on the target and leads to the material deformation. The interaction between the AWJ and target and the fluid-solid coupling is happened. The cloud figure of the target’s deformation and stress are obtained by FEM software. T

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Vidana Morales, Ruth Yadira, Susana Ortega Cisneros, Jose Rodrigo Camacho Perez, Federico Sandoval Ibarra, and Ricardo Casas Carrillo. "3D Simulation-Based Acoustic Wave Resonator Analysis and Validation Using Novel Finite Element Method Software." Sensors 21, no. 8 (2021): 2715. http://dx.doi.org/10.3390/s21082715.

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This work illustrates the analysis of Film Bulk Acoustic Resonators (FBAR) using 3D Finite Element (FEM) simulations with the software OnScale in order to predict and improve resonator performance and quality before manufacturing. This kind of analysis minimizes manufacturing cycles by reducing design time with 3D simulations running on High-Performance Computing (HPC) cloud services. It also enables the identification of manufacturing effects on device performance. The simulation results are compared and validated with a manufactured FBAR device, previously reported, to further highlight the

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Tolvaly-Rosca, Ferenc, András Kakucs, Zoltán Forgó, and Márton Máté. "Comparative FEM Analysis of Gears Modeled With Analytical, Solid Subtracting and Mixed CAD Generating Method." MACRo 2015 2, no. 1 (2017): 121–28. http://dx.doi.org/10.1515/macro-2017-0014.

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AbstractThe paper proposes a comparative FEM analysis of gears solid model bodies, obtained with three different methods. The analytical method is based on the mathematical equations of the tooth flanks. It supposed to be the most accurate and precise solid modeling process. However, it reveals it’s limits by handling of surfaces that are not deduced mathematically, or in case of tooth geometries which needs to be modified in order to perform a quick test regarding the probably effects of the mentioned modifications. The solid subtraction- and the newly developed, mixed CAD method are pure CAD

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Selvaggi, I., G. Bitelli, E. Serantoni, and A. Wieser. "POINT CLOUD DATASET AND FEM FOR A COMPLEX GEOMETRY: THE SAN LUZI BELL TOWER CASE STUDY." ISPRS - International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences XLII-2/W11 (May 5, 2019): 1047–52. http://dx.doi.org/10.5194/isprs-archives-xlii-2-w11-1047-2019.

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<p><strong>Abstract.</strong> Detailed three-dimensional reconstruction of heritage objects is crucial for different purposes, such as analysis, preservation and maintenance, among others. Geomatics techniques allow acquiring complex and comprehensive information about geometry and current conditions of the surveyed objects in a short time, which is a great advantage for documentation and historical archives. The reconstruction of three-dimensional models is often performed using either image-based techniques, mainly Close Range Photogrammetry (CRP), including Structure from

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Shang, Peng, Wei Zhou, Chun Xia Li, and Yu Ming Guan. "FEM Based Statics Analysis of the Main Steel Structure of Bucket Wheel Stacker-Reclaimer." Advanced Materials Research 690-693 (May 2013): 1933–39. http://dx.doi.org/10.4028/www.scientific.net/amr.690-693.1933.

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Bucket wheel stacker-reclaimer is kind of a typical multi-rigid-body system. Its main steel structure consists of bucket wheel, forearm frame, column tower, balance frame and pull rod, etc. All components connected with each other basically by welding. And the integral structure can realize whole luffing motion and turning motion. Reclaiming arm, central bracket and pitch steel structure of counterweight arm are the structure of its core. This paper use ANSYS to create the simplified finite element model of the steel structure and analyze the distribution of loads in all types of conditions. L

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Asad, Bilal, Toomas Vaimann, Anouar Belahcen, Ants Kallaste, Anton Rassõlkin, and M. Naveed Iqbal. "The Cluster Computation-Based Hybrid FEM–Analytical Model of Induction Motor for Fault Diagnostics." Applied Sciences 10, no. 21 (2020): 7572. http://dx.doi.org/10.3390/app10217572.

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This paper presents a hybrid finite element method (FEM)–analytical model of a three-phase squirrel cage induction motor solved using parallel processing for reducing the simulation time. The growing development in artificial intelligence (AI) techniques can lead towards more reliable diagnostic algorithms. The biggest challenge for AI techniques is that they need a big amount of data under various conditions to train them. These data are difficult to obtain from the industries because they contain low numbers of possible faulty cases, as well as from laboratories because a limited number of m

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Prokop, Anna, Piotr Nazarko, and Leonard Ziemiański. "Digitalization of historic buildings using modern technologies and tools." Budownictwo i Architektura 20, no. 2 (2021): 083–94. http://dx.doi.org/10.35784/bud-arch.2444.

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The aim of the paper is to present some experiences of using modern technologies to historical buildings digitalization. The emphasis is placed on the possibilities of spatial data collecting, as well as on subsequent 3D modelling. The paper describes the proposed survey techniques which are based on the Terrestrial Laser Scanning and photogrammetry. The authors obtained the point cloud by using the laser scanner Faro Focus 3D and dedicated software to combine scans (target based and cloud to cloud methods). The paper also provides an introduction to issues related to a method of building stru

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Almac, Umut, Isıl Polat Pekmezci, and Metin Ahunbay. "Numerical Analysis of Historic Structural Elements Using 3D Point Cloud Data." Open Construction and Building Technology Journal 10, no. 1 (2016): 233–45. http://dx.doi.org/10.2174/1874836801610010233.

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The 3D laser scanner has become a common instrument in numerous field applications such as structural health monitoring, assessment and documentation of structural damages, volume and dimension control of excavations, geometrical recording of built environment, and construction progress monitoring in different fields. It enables capture of millions of points from the surface of objects with high accuracy and in a very short time. These points can be employed to extrapolate the shape of the elements. In this way, the collected data can be developed to construct three-dimensional digital models

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Lucidi, A., E. Giordano, F. Clementi, and R. Quattrini. "POINT CLOUD EXPLOITATION FOR STRUCTURAL MODELING AND ANALYSIS: A RELIABLE WORKFLOW." International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences XLIII-B2-2021 (June 28, 2021): 891–98. http://dx.doi.org/10.5194/isprs-archives-xliii-b2-2021-891-2021.

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Abstract. The digitization and geometric knowledge of the historical built heritage is currently based on point cloud, that rarely or only partially is used as digital twin for structural analysis. The present work deals with historical artefacts survey, with particular reference to masonry structures, aimed to their structural analysis and assessment. In detail, the study proposes a methodology capable of employing semi-directly the original data obtained from the 3D digital survey for the generation of a Finite Element Model (FEM), used for structural analysis of masonry buildings.The method

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Rahmani, Arash, Ahmad Ghanbari, and Ali Mohammadi. "Experimental Modal Analysis of a First Stage Blade in ALSTOM Gas Turbine." Applied Mechanics and Materials 624 (August 2014): 303–7. http://dx.doi.org/10.4028/www.scientific.net/amm.624.303.

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Failures of turbine blades are one of the most critical problems in power generating industry. Among the different failure mechanisms, resonant vibration of blades has a major role and therefore is the subject of many recent research works. Therefore, in this paper, modal analysis of a first stage blade in ALSTOM gas turbine is investigated and natural frequencies and vibration modes of blade are found in various conditions. For this purpose, a cloud-point model of a gas turbine blade has been created using 3D Laser Digitizer. Then the numerical calculation by finite element method using ANSYS

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Gu, Han Qing, and Xiao Jing Yang. "Analysis of Micro/Nanoscale Mechanical Properties of Monocrystalline Germanium Using Finite Element Method and Nanoindentation Experiment." Applied Mechanics and Materials 574 (July 2014): 119–26. http://dx.doi.org/10.4028/www.scientific.net/amm.574.119.

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The finite element method and nanoindentation experiment are used in this paper, to analysis mechanical properties of monocrystalline germanium on micro/nanoscale. The cloud charts of stress and strain distribution are obtained by finite element method. It is shown that the depth increment of the contact makes the value of stress and strain in the surface layer greater and the area of action larger in the process of nanoindentation of monocrystalline germanium. In the nanoindentation experiment, load and displacement curve is different with different crystal orientations. With the increase of

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Pepe, Massimiliano, Domenica Costantino, and Alfredo Restuccia Garofalo. "An Efficient Pipeline to Obtain 3D Model for HBIM and Structural Analysis Purposes from 3D Point Clouds." Applied Sciences 10, no. 4 (2020): 1235. http://dx.doi.org/10.3390/app10041235.

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The aim of this work is to identify an efficient pipeline in order to build HBIM (heritage building information modelling) and create digital models to be used in structural analysis. To build accurate 3D models it is first necessary to perform a geomatics survey. This means performing a survey with active or passive sensors and, subsequently, accomplishing adequate post-processing of the data. In this way, it is possible to obtain a 3D point cloud of the structure under investigation. The next step, known as “scan-to-BIM (building information modelling)”, has led to the creation of an appropr

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Kappagantu, Ramana, Karl Karlson, and Koen Vansant. "Digitalizing sound in your personal space." INTER-NOISE and NOISE-CON Congress and Conference Proceedings 263, no. 5 (2021): 1620–32. http://dx.doi.org/10.3397/in-2021-1884.

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Design specifications for appliances are usually in the context of standard acoustic rooms like anechoic (full or hemi) and sometimes reverberant. However in the world of infotainment industry the devices are operated in your personal space - a generic environment like that of a living room and they continuously interact with other devices in real time. One has to take into account the scattering and absorption of sound from different surfaces and how they constructively and destructively interfere in generating a signature sound for the room and the devices. This environmental impact increase

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Török, Ákos, Árpád Barsi, Gyula Bögöly, Tamás Lovas, Árpád Somogyi, and Péter Görög. "Slope stability and rockfall assessment of volcanic tuffs using RPAS with 2-D FEM slope modelling." Natural Hazards and Earth System Sciences 18, no. 2 (2018): 583–97. http://dx.doi.org/10.5194/nhess-18-583-2018.

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Abstract. Steep, hardly accessible cliffs of rhyolite tuff in NE Hungary are prone to rockfalls, endangering visitors of a castle. Remote sensing techniques were employed to obtain data on terrain morphology and to provide slope geometry for assessing the stability of these rock walls. A RPAS (Remotely Piloted Aircraft System) was used to collect images which were processed by Pix4D mapper (structure from motion technology) to generate a point cloud and mesh. The georeferencing was made by Global Navigation Satellite System (GNSS) with the use of seven ground control points. The obtained digit

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Selvaggi, I., M. Dellapasqua, F. Franci, A. Spangher, D. Visintini, and G. Bitelli. "3D COMPARISON TOWARDS A COMPREHENSIVE ANALYSIS OF A BUILDING IN CULTURAL HERITAGE." ISPRS - International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences XLII-2 (May 30, 2018): 1061–66. http://dx.doi.org/10.5194/isprs-archives-xlii-2-1061-2018.

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Terrestrial remote sensing techniques, including both Terrestrial Laser Scanning (TLS) and Close-Range Photogrammetry (CRP), have been recently used in multiple applications and projects with particular reference to the documentation/inspection of a wide variety of Cultural Heritage structures.<br> The high density of TLS point cloud data allows to perform structure survey in an unprecedented level of detail, providing a direct solution for the digital three-dimensional modelling, the site restoration and the analysis of the structural conditions. Textural information provided by CRP can

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Guarnieri, A., F. Fissore, A. Masiero, A. Di Donna, U. Coppa, and A. Vettore. "FROM SURVEY TO FEM ANALYSIS FOR DOCUMENTATION OF BUILT HERITAGE: THE CASE STUDY OF VILLA REVEDIN-BOLASCO." ISPRS - International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences XLII-5/W1 (May 16, 2017): 527–33. http://dx.doi.org/10.5194/isprs-archives-xlii-5-w1-527-2017.

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In the last decade advances in the fields of close-range photogrammetry, terrestrial laser scanning (TLS) and computer vision (CV) have enabled to collect different kind of information about a Cultural Heritage objects and to carry out highly accurate 3D models. Additionally, the integration between laser scanning technology and Finite Element Analysis (FEA) is gaining particular interest in recent years for structural analysis of built heritage, since the increasing computational capabilities allow to manipulate large datasets. In this note we illustrate the approach adopted for surveying, 3D

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Zhang, Shaobiao, Dayong Xu, Gansu Shen, Junguo Liu, and Lili Yang. "Numerical Simulation of Na-Tech Cascading Disasters in a Large Oil Depot." International Journal of Environmental Research and Public Health 17, no. 22 (2020): 8620. http://dx.doi.org/10.3390/ijerph17228620.

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The mechanism of natural-hazard-triggered technological (Na-tech) cascading disasters is complex, and the extent to which their damage is aggravated by various secondary events is difficult to quantify. This study selected a large oil depot and constructed a full-scale three-dimensional scene model based on the surrounding geographical environment. The discrete element method (DEM), finite element method (FEM) and finite volume method (FVM) were employed to conduct numerical simulations of the process and consequences of the following Na-tech disasters: heavy-rainfall-induced landslide → block

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Meschini, A., E. Petrucci, D. Rossi, and F. Sicuranza. "Point cloud-based survey for cultural heritage – An experience of integrated use of range-based and image-based technology for the San Francesco convent in Monterubbiano." ISPRS - International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences XL-5 (June 6, 2014): 413–20. http://dx.doi.org/10.5194/isprsarchives-xl-5-413-2014.

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The paper aims at presenting some results of a point cloud-based survey carried out through integrated methodologies based on active and passive 3D acquisition techniques for processing 3D models. This experiment is part of a research project still in progress conducted by an interdisciplinary team from the School of Architecture and Design of Ascoli Piceno and funded by the University of Camerino. We describe an experimentation conducted on the convent of San Francesco located in Monterubbiano town center (Marche, Italy). The whole complex has undergone a number of substantial changes since t

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Antón, Daniel, Paloma Pineda, Benachir Medjdoub, and Alfredo Iranzo. "As-Built 3D Heritage City Modelling to Support Numerical Structural Analysis: Application to the Assessment of an Archaeological Remain." Remote Sensing 11, no. 11 (2019): 1276. http://dx.doi.org/10.3390/rs11111276.

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Terrestrial laser scanning is a widely used technology to digitise archaeological, architectural and cultural heritage. This allows for modelling the assets’ real condition in comparison with traditional data acquisition methods. This paper, based on the case study of the basilica in the Baelo Claudia archaeological ensemble (Tarifa, Spain), justifies the need of accurate heritage modelling against excessively simplified approaches in order to support structural safety analysis. To do this, after validating the 3D meshing process from point cloud data, the semi-automatic digital reconstitution

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Vance, A. K., S. J. Abel, R. J. Cotton, and A. M. Woolley. "Performance of WVSS-II hygrometers on the FAAM research aircraft." Atmospheric Measurement Techniques 8, no. 3 (2015): 1617–25. http://dx.doi.org/10.5194/amt-8-1617-2015.

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Abstract. We compare the performance of five hygrometers fitted to the Facility for Airborne Atmospheric Measurement's (FAAM) BAe 146-301 research aircraft using data from approximately 100 flights executed over the course of 2 years under a wide range of conditions. Bulk comparison of cloud free data show good agreement between chilled mirror hygrometers and a WVSS-II fed from a modified Rosemount inlet, but that a WVSS-II fed from the standard flush inlet appears to over-read compared to the other instruments, except at higher humidities. Statistical assessment of hygrometer performance in c

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Vance, A. K., S. J. Abel, R. J. Cotton, and A. M. Woolley. "Performance of WVSS-II hygrometers on the FAAM Research Aircraft." Atmospheric Measurement Techniques Discussions 7, no. 8 (2014): 8643–67. http://dx.doi.org/10.5194/amtd-7-8643-2014.

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Abstract. We compare the performance of five hygrometers fitted to the Facility for Airborne Atmospheric Measurement's (FAAM) BAe 146-301 research aircraft using data from approximately one hundred flights executed over the course of two years under a wide range of conditions. Bulk comparison of cloud free data show good agreement between chilled mirror hygrometers and a WVSS-II fed from a modified Rosemount inlet but that a WVSS-II fed from the standard flush inlet appears to over read compared to the other instruments, except at higher humidities. Statistical assessment of hygrometer perform

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Kite, Edwin S., Liam J. Steele, Michael A. Mischna, and Mark I. Richardson. "Warm early Mars surface enabled by high-altitude water ice clouds." Proceedings of the National Academy of Sciences 118, no. 18 (2021): e2101959118. http://dx.doi.org/10.1073/pnas.2101959118.

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Despite receiving just 30% of the Earth’s present-day insolation, Mars had water lakes and rivers early in the planet’s history, due to an unknown warming mechanism. A possible explanation for the >102-y-long lake-forming climates is warming by water ice clouds. However, this suggested cloud greenhouse explanation has proved difficult to replicate and has been argued to require unrealistically optically thick clouds at high altitudes. Here, we use a global climate model (GCM) to show that a cloud greenhouse can warm a Mars-like planet to global average annual-mean temperature (T¯) ∼265 K, w

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Moravčík, Ľuboš, Radko Vincúr, and Zdenka Rózová. "Analysis of the Static Behavior of a Single Tree on a Finite Element Model." Plants 10, no. 7 (2021): 1284. http://dx.doi.org/10.3390/plants10071284.

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This work deals with the innovated complex process of tree risk assessment, from precise geometrical tree shape acquisition to building and analyzing a finite element model under specified load. The acquisition of the 3D geometry of the tree was performed by means of terrestrial laser scanning. Obtained point cloud was optimized and additionally converted to a 3D CAD model, representing the bearing skeleton compound of trunk and main branches. For structural analysis purposes, a finite element model (FEM) was built in the form of beam structure fixed to the ground. Particular beams were define

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Dib, Sami, Sylvain Bontemps, Nicola Schneider, et al. "The structure and characteristic scales of molecular clouds." Astronomy & Astrophysics 642 (October 2020): A177. http://dx.doi.org/10.1051/0004-6361/202038849.

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The structure of molecular clouds holds important clues regarding the physical processes that lead to their formation and subsequent dynamical evolution. While it is well established that turbulence imprints a self-similar structure onto the clouds, other processes, such as gravity and stellar feedback, can break their scale-free nature. The break of self-similarity can manifest itself in the existence of characteristic scales that stand out from the underlying structure generated by turbulent motions. In this work, we investigate the structure of the Cygnus-X North and Polaris Flare molecular

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French, Jeffrey R., Katja Friedrich, Sarah A. Tessendorf, et al. "Precipitation formation from orographic cloud seeding." Proceedings of the National Academy of Sciences 115, no. 6 (2018): 1168–73. http://dx.doi.org/10.1073/pnas.1716995115.

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Throughout the western United States and other semiarid mountainous regions across the globe, water supplies are fed primarily through the melting of snowpack. Growing populations place higher demands on water, while warmer winters and earlier springs reduce its supply. Water managers are tantalized by the prospect of cloud seeding as a way to increase winter snowfall, thereby shifting the balance between water supply and demand. Little direct scientific evidence exists that confirms even the basic physical hypothesis upon which cloud seeding relies. The intent of glaciogenic seeding of orogra

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Yang, Xiaoqian, Zhenhong Jia, Jie Yang, and Nikola Kasabov. "Change Detection of Optical Remote Sensing Image Disturbed by Thin Cloud Using Wavelet Coefficient Substitution Algorithm." Sensors 19, no. 9 (2019): 1972. http://dx.doi.org/10.3390/s19091972.

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The detection of changes in optical remote sensing images under the interference of thin clouds is studied for the first time in this paper. First, the optical remote sensing image is subjected to thin cloud removal processing, and then the processed remote sensing image is subjected to image change detection. Based on the analysis of the characteristics of thin cloud images, a method for removing thin clouds based on wavelet coefficient substitution is proposed in this paper. Based on the change in the wavelet coefficient, the high- and low-frequency parts of the remote sensing image are repl

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Chang, Yue-Shan, Yi-Kang Lee, Tong-Ying Juang, and Jing-Shyang Yen. "Cost Evaluation on Building and Operating Cloud Platform." International Journal of Grid and High Performance Computing 5, no. 2 (2013): 43–53. http://dx.doi.org/10.4018/jghpc.2013040103.

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Cost issue always is one of most important issue for enterprise in building their IT platform. With the advance of various cloud environments, enterprise’s IT executive may have different consideration in constructing their IT platform. For example, constructing an own cloud environment or renting a computing platform from cloud providers. This paper the authors, based on the Net Present Value in Finance field, propose a cost model for evaluating the tradeoff between building a self-own computing platform and renting one from public provider. The cost evaluation formulas are derived based on s

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Zhou, C., X. Zhang, S. Gong, Y. Wang, and M. Xue. "Improving aerosol interaction with clouds and precipitation in a regional chemical weather modeling system." Atmospheric Chemistry and Physics Discussions 15, no. 11 (2015): 15755–90. http://dx.doi.org/10.5194/acpd-15-15755-2015.

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Abstract. A comprehensive aerosol–cloud–precipitation interaction (ACI) scheme has been developed under CMA chemical weather modeling system GRAPES/CUACE. Calculated by a sectional aerosol activation scheme based on the information of size and mass from CUACE and the thermal-dynamic and humid states from the weather model GRAPES at each time step, the cloud condensation nuclei (CCN) is fed online interactively into a two-moment cloud scheme (WDM6) and a convective parameterization to drive the cloud physics and precipitation formation processes. The modeling system has been applied to study th

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Garnier, Anne, Jacques Pelon, Philippe Dubuisson, et al. "Retrieval of Cloud Properties Using CALIPSO Imaging Infrared Radiometer. Part I: Effective Emissivity and Optical Depth." Journal of Applied Meteorology and Climatology 51, no. 7 (2012): 1407–25. http://dx.doi.org/10.1175/jamc-d-11-0220.1.

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AbstractThe paper describes the operational analysis of the Imaging Infrared Radiometer (IIR) data, which have been collected in the framework of the Cloud–Aerosol Lidar and Infrared Pathfinder Satellite Observation (CALIPSO) mission for the purpose of retrieving high-altitude (above 7 km) cloud effective emissivity and optical depth that can be used in synergy with the vertically resolved Cloud–Aerosol Lidar with Orthogonal Polarization (CALIOP) collocated observations. After an IIR scene classification is built under the CALIOP track, the analysis is applied to features detected by CALIOP wh

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Puget, J. L. "Magnetic fields and the dynamics of molecular clouds." Symposium - International Astronomical Union 147 (1991): 75–81. http://dx.doi.org/10.1017/s0074180900198808.

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Magnetic fields are believed to play an important role in the star formation process. Correlations in the velocity field in molecular filaments are indicative of dynamical interactions between clouds and parts within a cloud. The magnetic field is a likely candidate as the vector of such interactions. Perturbations of the field at large scales can feed the velocity dispersion within condensations at small scale. This mechanism is discussed in the framework of two simple analytical approximations describing transverse waves fed into plane parallel slabs.

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Puget, J. L. "Magnetic fields and the dynamics of molecular clouds." Symposium - International Astronomical Union 147 (1991): 75–81. http://dx.doi.org/10.1017/s0074180900239429.

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Magnetic fields are believed to play an important role in the star formation process. Correlations in the velocity field in molecular filaments are indicative of dynamical interactions between clouds and parts within a cloud. The magnetic field is a likely candidate as the vector of such interactions. Perturbations of the field at large scales can feed the velocity dispersion within condensations at small scale. This mechanism is discussed in the framework of two simple analytical approximations describing transverse waves fed into plane parallel slabs.

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Mapes, Brian, Julio Bacmeister, Marat Khairoutdinov, Cecile Hannay, and Ming Zhao. "Virtual Field Campaigns on Deep Tropical Convection in Climate Models." Journal of Climate 22, no. 2 (2009): 244–57. http://dx.doi.org/10.1175/2008jcli2203.1.

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Abstract High-resolution time–height data over warm tropical oceans are examined, from three global atmosphere models [GFDL’s Atmosphere Model 2 (AM2), NCAR’s Community Atmosphere Model, version 3 (CAM3), and a NASA Global Modeling and Assimilation Office (GMAO) model], field campaign observations, and observation-driven cloud model outputs. The character of rain events is shown in data samples and summarized in lagged regressions versus surface rain rate. The CAM3 humidity and cloud exhibit little vertical coherence among three distinct layers, and its rain events have a short characteristic

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Whitehead, Peter. ""White Clouds," Poem, 1988." Framework: The Journal of Cinema and Media 52, no. 2 (2011): 770–72. http://dx.doi.org/10.1353/frm.2011.0075.

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Zhou, C., X. Zhang, S. Gong, Y. Wang, and M. Xue. "Improving aerosol interaction with clouds and precipitation in a regional chemical weather modeling system." Atmospheric Chemistry and Physics 16, no. 1 (2016): 145–60. http://dx.doi.org/10.5194/acp-16-145-2016.

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Abstract. A comprehensive aerosol–cloud–precipitation interaction (ACI) scheme has been developed under a China Meteorological Administration (CMA) chemical weather modeling system, GRAPES/CUACE (Global/Regional Assimilation and PrEdiction System, CMA Unified Atmospheric Chemistry Environment). Calculated by a sectional aerosol activation scheme based on the information of size and mass from CUACE and the thermal-dynamic and humid states from the weather model GRAPES at each time step, the cloud condensation nuclei (CCN) are interactively fed online into a two-moment cloud scheme (WRF Double-M

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Li, Dilong, Xin Shen, Yongtao Yu, et al. "Building Extraction from Airborne Multi-Spectral LiDAR Point Clouds Based on Graph Geometric Moments Convolutional Neural Networks." Remote Sensing 12, no. 19 (2020): 3186. http://dx.doi.org/10.3390/rs12193186.

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Building extraction has attracted much attentions for decades as a prerequisite for many applications and is still a challenging topic in the field of photogrammetry and remote sensing. Due to the lack of spectral information, massive data processing, and approach universality, building extraction from point clouds is still a thorny and challenging problem. In this paper, a novel deep-learning-based framework is proposed for building extraction from point cloud data. Specifically, first, a sample generation method is proposed to split the raw preprocessed multi-spectral light detection and ran

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Jiao, Yujun, and Zhishuai Yin. "A Two-Phase Cross-Modality Fusion Network for Robust 3D Object Detection." Sensors 20, no. 21 (2020): 6043. http://dx.doi.org/10.3390/s20216043.

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A two-phase cross-modality fusion detector is proposed in this study for robust and high-precision 3D object detection with RGB images and LiDAR point clouds. First, a two-stream fusion network is built into the framework of Faster RCNN to perform accurate and robust 2D detection. The visible stream takes the RGB images as inputs, while the intensity stream is fed with the intensity maps which are generated by projecting the reflection intensity of point clouds to the front view. A multi-layer feature-level fusion scheme is designed to merge multi-modal features across multiple layers in order

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Geisler, D., A. McWilliam, N. Suntzeff, M. Mateo, J. Graham, and L. Pasquini. "Metal abundances of Magellanic Cloud clusters." Symposium - International Astronomical Union 148 (1991): 341–42. http://dx.doi.org/10.1017/s0074180900200752.

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We have obtained Washington CCD photometry with the CTIO 4m and 1.5m for ˜50 intermediate-to-old age star clusters in the Clouds. The data extend to near or below the main sequence and provide excellent photometry for the giants, from which precise (internal errors <0.1 dex) mean cluster abundances can be determined. We present data for several of the clusters and discuss the results. Intermediate resolution spectra have also been obtained for some 16 clusters with the CTIO 4m ARGUS multiple-object fibre-fed spectrograph. Finally, we have also obtained high dispersion (R˜20,000) échelle spe

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Keevallik, Liina, and Indrek Ibrus. "Cloud Opera through the prism of artistic research: looking for media archaeological issues from the clouds." Baltic Screen Media Review 7, no. 1 (2019): 72–95. http://dx.doi.org/10.2478/bsmr-2019-0005.

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AbstractCloud Opera or The Dido Problem (Vaba Lava, Tallinn, Feb-Mar 2019) is a theatrical performance investigating, through artistic means, the human condition in the datafied world. The play was created in collaboration between Vaba Lava theatre and Tallinn University’s Centre of Excellence in Media Innovation and Digital Culture (MEDIT). In terms of its representations, the play combined references to man-made data ‘clouds’ with knowledge on atmospheric clouds and suggested that the former are just as unpredictable and uncontrollable as the latter. In this article, Liina Keevallik, the aut

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