Добірка наукової літератури з теми "PIC method"

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Статті в журналах з теми "PIC method"

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Zhou, Kun, Jun Zhang, Zun-Rong Zheng, Yu-Zhen Zhou, Xun Zhou, Li-Da Wang, Bing Suo, Xiao-Feng Jiang, Pei-Jia Liu, and Dong-Hua Wang. "Diagnostic and Prognostic Value of TAT, PIC, TM, and t-PAIC in Malignant Tumor Patients With Venous Thrombosis." Clinical and Applied Thrombosis/Hemostasis 26 (January 1, 2020): 107602962097104. http://dx.doi.org/10.1177/1076029620971041.

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Background: Venous thromboembolism (VTE) is an important complication in patients with malignant tumors. Its exact diagnosis and treatment are still lacking. We used a high-sensitive chemiluminescence method to detect thrombin–antithrombin III complex (TAT), plasmin-α2-plasmininhibitor complex (PIC), thrombomodulin (TM), and tissue plasminogen activator–inhibitor complex(t-PAIC) in combination with D-dimer and fibrin degradation product (FDP) to analyze their diagnostic and prognostic value in patients with malignant tumors. Methods: In total, 870 patients with confirmed malignant tumors were included, 82 of whom had diagnosed VTE; 200 healthy individuals were classified as the control group. The TAT, PIC, TM, and t-PAIC were detected using Sysmex HISCL5000 automated analyzers, whereas FDP and D-dimer were detected using Sysmex CS5100 coagulation analyzer. Receiver operating characteristic (ROC) curves were used to evaluate the diagnostic efficiency. Survival probabilities were determined using Kaplan–Meier analysis, and multivariate analyses were performed using a Cox regression model. Results: Compared with healthy controls, patients with malignant tumors showed significantly elevated TAT, PIC, TM, t-PAIC, D-dimer, and FDP. Similarly, compared with patients in the non-thrombosis group, those in the thrombosis group showed significantly elevated levels of the above mentioned markers. Logistic regression analysis showed that TAT, PIC, TM, t-PAIC, D-Dimer, and FDP were all associated with VTE. ROC analysis showed that “TAT+PIC+TM+t-PAIC+D-dimer+FDP”showed the highest sensitivity and specificity. Patients with elevated TAT, PIC, TM, and t-PAIC had a significantly shorter survival. Multivariate Cox survival analysis showed that TM and t-PAIC were significantly associated with poor prognosis. In addition, the incidence of VTE was significantly lower in patients with malignant tumors who were treated with low-molecular-weight heparin (LMWH), and their survival period was significantly longer than that of patients with malignant tumors who were not treated with LMWH. Conclusion: TAT, PIC, TM, and t-PAIC combined with D-dimer and FDP were better than the application of a single marker in the diagnosis of VTE in patients with malignant tumors. TAT and PIC can be used as sensitive markers in the diagnosis of VTE but not as prognostic markers. TM and t-PAIC might be independent prognostic indicators in patients with malignant tumors, regardless of the state of thrombus.
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Happ, Sebastian, and Mario V. Wüthrich. "PAID-INCURRED CHAIN RESERVING METHOD WITH DEPENDENCE MODELING." ASTIN Bulletin 43, no. 1 (January 2013): 1–20. http://dx.doi.org/10.1017/asb.2012.4.

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AbstractThe paid-incurred chain (PIC) reserving method is a claims reserving method that allows to combine claims payments and incurred losses information in a mathematical consistent way. The main criticism on the original Bayesian log-normal PIC model presented in Merz–Wüthrich [5] is that it does not respect dependence properties within the observed data. In the present paper, we extend the original Bayesian log-normal PIC model so that dependence is modeled in an appropriate way.
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Schwieler, Lilly, Ada Trepci, Stanislaw Krzyzanowski, Sigurd Hermansson, Mathias Granqvist, Fredrik Piehl, Tomas Venckunas, et al. "A novel, robust method for quantification of multiple kynurenine pathway metabolites in the cerebrospinal fluid." Bioanalysis 12, no. 6 (March 2020): 379–92. http://dx.doi.org/10.4155/bio-2019-0303.

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Aim: Kynurenine metabolites are potential modulators of psychiatric disease. We aimed to develop a highly sensitive biochemical analysis of cerebrospinal fluid (CSF) tryptophan (TRP) metabolites, to investigate the stability of metabolites and to confirm our previous findings of aberrant CSF quinolinic acid (QUIN) and picolinic acid (PIC) in suicide attempters using this method. Methodology & results: Ten CSF TRP metabolites were analyzed with ultraperformance LC–MS/MS. The method showed small intra- and interassay variation. Metabolites were stable following freeze–thaw cycles. A decreased CSF PIC/QUIN ratio was found in suicide attempters. Conclusion: The feasibility of reliably determining CSF TRP metabolites were demonstrated, including separation of the two isomers PIC and nicotinic acid (NA) and the finding of a reduced PIC/QUIN ratio replicated in suicide attempters.
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Bouanaka, Fouzi, Saida Rebiaï, Hanene Bahouh, and Salah Sahli. "PIC-MC Simulation Method of DC Discharge Plasmas." Advanced Materials Research 227 (April 2011): 121–24. http://dx.doi.org/10.4028/www.scientific.net/amr.227.121.

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We propose in this paper a numerical particle type model PIC-MC (Particle-In-Cell Monte Carlo) for modeling plasma reactors in the case of DC discharge used for various industrial applications. The model is developed in the case of argon plasma at low pressure, generated in a reactor consisting of two flat electrodes parallel and spaced 3 cm. The collisions treatment is based on the “null collision” method. PIC-MC model can provide the plasma characteristics (potential, field and charge density) in inter-electrodes space, for all reactions in addition to collisions that may occur.
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Bogachev, N. N. "Simulation of a plasma antenna by PIC method." Journal of Physics: Conference Series 661 (December 2, 2015): 012054. http://dx.doi.org/10.1088/1742-6596/661/1/012054.

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Minhua, Wen, Yu Zhanpeng, Simon See, Wang Peng, Wang Zehuan, and James Lin. "A NVIDA Kepler Based Acceleration of PIC Method." Procedia Engineering 61 (2013): 398–401. http://dx.doi.org/10.1016/j.proeng.2013.08.034.

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Nishikawa, Ken-Ichi, Yosuke Mizuno, Jose Gómez, Ioana Duţan, Athina Meli, Jacek Niemiec, Oleh Kobzar, et al. "Relativistic Jet Simulations of the Weibel Instability in the Slab Model to Cylindrical Jets with Helical Magnetic Fields." Galaxies 7, no. 1 (January 30, 2019): 29. http://dx.doi.org/10.3390/galaxies7010029.

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Анотація:
The particle-in-cell (PIC) method was developed to investigate microscopic phenomena, and with the advances in computing power, newly developed codes have been used for several fields, such as astrophysical, magnetospheric, and solar plasmas. PIC applications have grown extensively, with large computing powers available on supercomputers such as Pleiades and Blue Waters in the US. For astrophysical plasma research, PIC methods have been utilized for several topics, such as reconnection, pulsar dynamics, non-relativistic shocks, relativistic shocks, and relativistic jets. PIC simulations of relativistic jets have been reviewed with emphasis placed on the physics involved in the simulations. This review summarizes PIC simulations, starting with the Weibel instability in slab models of jets, and then focuses on global jet evolution in helical magnetic field geometry. In particular, we address kinetic Kelvin-Helmholtz instabilities and mushroom instabilities.
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Assous, F., T. Pougeard Dulimbert, and J. Segré. "A new method for coalescing particles in PIC codes." Journal of Computational Physics 187, no. 2 (May 2003): 550–71. http://dx.doi.org/10.1016/s0021-9991(03)00124-4.

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Kudo, Yoshihiro, Tsubasa Nakamori, and Chiya Numako. "Extraction of Sodium Picrate by 3m-Crown-mEthers and Their Monobenzo Derivatives (m= 5, 6) into Benzene: Estimation of Their Equilibrium-Potential Differences at the Less-Polar Diluent/Water Interface by an Extraction Method." Journal of Chemistry 2016 (2016): 1–7. http://dx.doi.org/10.1155/2016/5175746.

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Individual distribution constants (KD,A) of picrate ion (Pic−) and extraction constants (Kex±) of NaPic by some crown ethers (L) into benzene (Bz) at 25°C were calculated from data reported previously. These constants were defined asKD,Pic=Pic-o/[Pic-]andKex±=NaL+oPic-o/(Na+Lo[Pic-]), respectively. Here, the subscript “o” denotes an organic (o) phase and practically o = Bz. 15-Crown-5 ether (15C5), 18-crown-6 one (18C6), and their monobenzo (B) derivatives (B15C5 and B18C6) were selected as L. Interfacial equilibrium-potential differences (Δϕeq) at extraction were estimated at 298 K. A plot oflog⁡Kex±versus-Δϕeqfor the four L extraction systems gave a straight line with slope = 84 V−1. This slope was compared with those, reported before, of the dichloromethane (DCM), 1,2-dichloroethane (DCE), and nitrobenzene (NB) extraction systems. The slopes of the regression lines were in the order NB < DCM ≤ DCE < Bz. Also, the individual distribution constants of the complex ionNaL+and an ion-pair complex (NaL+Pic-) into Bz phase were calculated from the above extraction data. At least, a comparison between these values suggests that Bz molecules mainly interact withNaL+moiety ofNaL+Pic-.
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Jamri, M. S., Zul Hasrizal Bohari, M. F. Baharom, M. H. Jali, M. N. M. Nasir, and T. A. Izzuddin. "Development of Novel Fire Alarm Warning System Using Automated Remote Messaging Method." Applied Mechanics and Materials 793 (September 2015): 578–84. http://dx.doi.org/10.4028/www.scientific.net/amm.793.578.

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Анотація:
This paper discussed on design and development of fire warning system using automated remote messaging method. This device enables to alert the owner whenever fire occur that need rapid attention towards the building. This is maybe due to carelessness of user or gas leakage. Fire warning system is an existing project but it will be enhanced. This project discussed the design and implementation of a fire alarm system using the microcontroller which controlled the entire system. This system comprised of smoke detector that linked to PIC and GSM Modem. When smoke detected, the fire alarm will triggered and send a signal to the PIC. The PIC will process the data and transmit the signal to the GSM modem. The GSM modem will send message to alert the building owner. The owner can make further action by informing the nearest fire department. This module is applied for transferring of GSM SMS message to the owner mobile number. The devices can be the early and fast prevention system for building owner.
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Дисертації з теми "PIC method"

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Chen, Qiang. "Development of a full particle PIC method for simulating nonlinear wave-structure interaction." Thesis, University of Bath, 2017. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.760902.

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During the past few decades, Computational Fluid Dynamics (CFD) modelling hasbecome very popular in the coastal and offshore engineering community. Both Eulerianand Lagrangian methods have achieved great successes; typical examples are thegrid-based OpenFOAM® model and the meshless Smoothed Particle Hydrodynamics(SPH) method based model (e.g. SPHysics). While the former tends to be moreefficient and has advantages in enforcing incompressibility and boundary conditionsvia use of a grid, the latter is more suitable for handling large free-surface deformationsusing particles. In an attempt to combine the advantages of both methods, theParticle-In-Cell (PIC) method was devised through a combined use of particles andgrid. However, so far this hybrid method has not been very well exploited for use inthe coastal and offshore engineering field, where modelling complex wave-structureinteraction with computational efficiency still remains an important challenge. This thesis develops a novel "full particle" PIC based numerical model that solves theincompressible Newtonian Navier-Stokes equations for single-phase free-surface flowswith an emphasis on fluid-structure interaction. The use of the phrase "full particle"here indicates that all of the fluid properties, such as the mass and momentum,are assigned only to the particles, rather than being split between the particles andgrid as is the case in "classical" PIC. The novelty of the model lies in the fact thatthe particles are employed to solve the nonlinear advection term and track the fluidconguration (including the free surface), while the underlying grid is solely usedfor computational convenience for solving the non-advection terms. In addition, atailored Distributed Lagrange Multiplier method and a Cartesian cut cell based two-waystrong coupling algorithm are incorporated for fluid-structure interaction. Themodel is developed in both two and three spatial dimensions, and the 3D modelis parallelised using the Message Passing Interface (MPI) approach. The model isvalidated using benchmark tests in the coastal and offshore engineering field withsimulating nonlinear wave-structure interaction being the principal interest. It isshown that the present "full particle" PIC model is flexible, efficient (in terms ofCPU cost) and accurate when modelling complex free-surface flows and the violentinteraction of such flows with (surface-piercing) structures of arbitrary shape anddegree of freedom. With new innovations, the model has great potential to become ahigh quality numerical tool for use in coastal and offshore engineering applications.
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Yager, Kolton Jacob. "GPU High-Performance Framework for PIC-like Simulation Methods Using the Vulkan® Explicit API." DigitalCommons@CalPoly, 2021. https://digitalcommons.calpoly.edu/theses/2284.

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Within computational continuum mechanics there exists a large category of simulation methods which operate by tracking Lagrangian particles over an Eulerian background grid. These Lagrangian/Eulerian hybrid methods, descendants of the Particle-In-Cell method (PIC), have proven highly effective at simulating a broad range of materials and mechanics including fluids, solids, granular materials, and plasma. These methods remain an area of active research after several decades, and their applications can be found across scientific, engineering, and entertainment disciplines. This thesis presents a GPU driven PIC-like simulation framework created using the Vulkan® API. Vulkan is a cross-platform and open-standard explicit API for graphics and GPU compute programming. Compared to its predecessors, Vulkan offers lower overhead, support for host parallelism, and finer grain control over both device resources and scheduling. This thesis harnesses those advantages to create a programmable GPU compute pipeline backed by a Vulkan adaptation of the SPgrid data-structure and multi-buffered particle arrays. The CPU host system works asynchronously with the GPU to maximize utilization of both the host and device. The framework is demonstrated to be capable of supporting Particle-in-Cell like simulation methods, making it viable for GPU acceleration of many Lagrangian particle on Eulerian grid hybrid methods. This novel framework is the first of its kind to be created using Vulkan® and to take advantage of GPU sparse memory features for grid sparsity.
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Hammel, Jeffrey Robert. "Development of an unstructured 3-D direct simulation Monte Carlo/particle-in-cell code and the simulation of microthruster flows." Link to electronic thesis, 2002. http://www.wpi.edu/Pubs/ETD/Available/etd-0510102-153614.

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PEIRETTI, PARADISI BENEDETTA. "Study on Coulomb explosion induced by laser-matter interaction and application to ion acceleration." Doctoral thesis, Politecnico di Torino, 2019. http://hdl.handle.net/11583/2739923.

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Mirzai, Amin. "Feasibility Study of Hall Thruster's Wall Erosion Modelling Using Multiphysics Software." Thesis, Luleå tekniska universitet, Institutionen för system- och rymdteknik, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-315.

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Анотація:
The most common type of electric propulsion in space exploration is the Hall Effect Thruster (HET), mainly due to its high specific impulse and high thrust to power ratio. However, uncertainties about the thruster's lifetime prediction have prevented widespread integration of HETs. Among these limitations, wall erosion of acceleration channel is of greatest concern. The experimental methods of erosion are time consuming and costly, and they are often limited to one single configuration. Hence, developing a computational model not only decreases the costs but also shortens the design time of a HET. This thesis investigates the feasibility of a uid erosion modelling with a multi-physics software (COMSOL) to further decrease the time and the development cost. First of all, this thesis provides an overview of available plasma modelling techniques and the physics behind the erosion phenomenon. Moreover, the effective parameters and available modules in the multiphysics software as well as their theoretical background were studied and discussed in detail. The Electron Anomalous phenomenon and pressure instability are determined as the main limiting factors for such a model. A non-magnetized model is included to find an optimal value for pressure and to reduce the probability of pressure instability occurrence in magnetized model. To fulfill this task, several simulations for various pressure values (0.005 Torr, 0.05 Torr, and 0.5 Torr) were conducted. Next, the simulation of magnetized/full model has been carried out with addition of magnetic coils in non-magnetized model. To avoid the Electron Anomalous phenomenon, the Bohm diffusion approach was implemented. In addition, a full Particle-In-Cell (PIC) simulation of a typical HET (SPT-100) with the similar input parameters as in fluid model was conducted, and the results were compared and validated using experimental data. The PIC model was intended to be utilized to investigate the accuracy of erosion model in multiphysics software. The results of this thesis indicate that current application of erosion model in COMSOL is not possible whilst high accuracy of the erosion model based on PIC approach can be achieved. Finally, the application of semi-empirical method through direct input of magnetic field data can allow short time simulation of a HET in COMSOL to gain insight about the preliminary behaviour of plasma, however, the simulation of an erosion model requires either a built-in PIC algorithm in COMSOL or a PIC based code.
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Kärrfelt, Erik, and Felix Hardell. "Investigation of a Novel Pick-and-Place Method." Thesis, KTH, Skolan för industriell teknik och management (ITM), 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-279481.

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Acoustic levitation is a versatile and promising tool for object manipulation that has been improved signicantly in recent years. This master's thesis explores the potential use of acoustic levitation in surface-mount technology. By coordinating several ultrasonic transducers an acoustic eld can be generated that can lift and manipulate small bodies without any physical contact. Earlier research in the area has demonstrated dierent arrangements for how the transducers can be placed. Two of these methods, each with 256 transducers, have been built and compared during this project. One arrangement can levitate bodies with higher density, while the other arrangement has provided a stronger lateral stability. An idea for future work is to combine the two arrangements to reach a solution that could potentially be used in surface-mount technology.
Akustisk levitation ar en mångsidig och lovande teknik som utvecklats markant under de senaste åren. Detta examensarbete undersöker potentialen som akustisk levitation kan ha inom kretskortsmontering. Genom att koordinera ett flertal ultraljudshögtalare kan ett akustiskt fält genereras som gör det möjligt att på ett kontrollerat sätt lyfta och förflytta små komponenter utan någon fysisk kontakt. Tidigare forskning inom området har påvisat olika sätt att placera högtalarna på. Två av dessa, vardera med 256 högtalarelement, har under detta projekt byggts och jämforts. Den ena uppställningen har visat sig kunna hålla objekt med högre densitet svävande medan den andra har visat sig ge en bättre lateral stabilitet. Ett förslag för framtida arbete är att kombinera de två uppställningarna för att uppnå en lösning som eventuellt skulle fungera for kretskortsmontering.
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Nikkhah, Hamdam. "Enhancing the Performance of Si Photonics: Structure-Property Relations and Engineered Dispersion Relations." Thesis, Université d'Ottawa / University of Ottawa, 2018. http://hdl.handle.net/10393/37144.

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Анотація:
The widespread adoption of photonic circuits requires the economics of volume manufacturing offered by integration technology. A Complementary Metal-Oxide Semiconductor compatible silicon material platform is particularly attractive because it leverages the huge investment that has been made in silicon electronics and its high index contrast enables tight confinement of light which decreases component footprint and energy consumption. Nevertheless, there remain challenges to the development of photonic integrated circuits. Although the density of integration is advancing steady and the integration of the principal components – waveguides, optical sources and amplifiers, modulators, and photodetectors – have all been demonstrated, the integration density is low and the device library far from complete. The integration density is low primarily because of the difficulty of confining light in structures small compared to the wavelength which measured in micrometers. The device library is incomplete because of the immaturity of hybridisation on silicon of other materials required by active devices such as III-V semiconductor alloys and ferroelectric oxides and the difficulty of controlling the coupling of light between disparate material platforms. Metamaterials are nanocomposite materials which have optical properties not readily found in Nature that are defined as much by their geometry as their constituent materials. This offers the prospect of the engineering of materials to achieve integrated components with enhanced functionality. Metamaterials are a class of photonic crystals includes subwavelength grating waveguides, which have already provided breakthroughs in component performance yet require a simpler fabrication process compatible with current minimum feature size limitations. The research reported in this PhD thesis advances our understanding of the structure-property relations of key planar light circuit components and the metamaterial engineering of these properties. The analysis and simulation of components featuring structures that are only just subwavelength is complicated and consumes large computer resources especially when a three dimensional analysis of components structured over a scale larger than the wavelength is desired. This obstructs the iterative design-simulate cycle. An abstraction is required that summarises the properties of the metamaterial pertinent to the larger scale while neglecting the microscopic detail. That abstraction is known as homogenisation. It is possible to extend homogenisation from the long-wavelength limit up to the Bragg resonance (band edge). It is found that a metamaterial waveguide is accurately modeled as a continuous medium waveguide provided proper account is taken of the emergent properties of the homogenised metamaterial. A homogenised subwavelength grating waveguide structure behaves as a strongly anisotropic and spatially dispersive material with a c-axis normal to the layers of a one dimensional multi-layer structure (Kronig-Penney) or along the axis of uniformity for a two dimensional photonic crystal in three dimensional structure. Issues with boundary effects in the near Bragg resonance subwavelength are avoided either by ensuring the averaging is over an extensive path parallel to boundary or the sharp boundary is removed by graded structures. A procedure is described that enables the local homogenised index of a graded structure to be determined. These finding are confirmed by simulations and experiments on test circuits composed of Mach-Zehnder interferometers and individual components composed of regular nanostructured waveguide segments with different lengths and widths; and graded adiabatic waveguide tapers. The test chip included Lüneburg micro-lenses, which have application to Fourier optics on a chip. The measured loss of each lens is 0.72 dB. Photonic integrated circuits featuring a network of waveguides, modulators and couplers are important to applications in RF photonics, optical communications and quantum optics. Modal phase error is one of the significant limitations to the scaling of multimode interference coupler port dimension. Multimode interference couplers rely on the Talbot effect and offer the best in-class performance. Anisotropy helps reduce the Talbot length but temporal and spatial dispersion is necessary to control the modal phase error and wavelength dependence of the Talbot length. The Talbot effect in a Kronig-Penny metamaterial is analysed. It is shown that the metamaterial may be engineered to provide a close approximation to the parabolic dispersion relation required by the Talbot effect for perfect imaging. These findings are then applied to the multimode region and access waveguide tapers of a multi-slotted waveguide multimode interference coupler with slots either in the transverse direction or longitudinal direction. A novel polarisation beam splitter exploiting the anisotropy provided by a longitudinally slotted structure is demonstrated by simulation. The thesis describes the design, verification by simulation and layout of a photonic integrated circuit containing metamaterial waveguide test structures. The test and measurement of the fabricated chip and the analysis of the data is described in detail. The experimental results show good agreement with the theory, with the expected errors due to fabrication process limitations. From the Scanning Electron Microscope images and the measurements, it is clear that at the boundary of the minimum feature size limit, the error increases but still the devices can function.
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Forest, Collado Josep. "New Methods for Triangulation-based Shape Acquisition using Laser Scanners." Doctoral thesis, Universitat de Girona, 2004. http://hdl.handle.net/10803/7730.

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Анотація:
Tradicionalment, la reproducció del mon real se'ns ha mostrat a traves d'imatges planes. Aquestes imatges se solien materialitzar mitjançant pintures sobre tela o be amb dibuixos. Avui, per sort, encara podem veure pintures fetes a ma, tot i que la majoria d'imatges s'adquireixen mitjançant càmeres, i es mostren directament a una audiència, com en el cinema, la televisió o exposicions de fotografies, o be son processades per un sistema computeritzat per tal d'obtenir un resultat en particular. Aquests processaments s'apliquen en camps com en el control de qualitat industrial o be en la recerca mes puntera en intel·ligència artificial. Aplicant algorismes de processament de nivell mitja es poden obtenir imatges 3D a partir d'imatges 2D, utilitzant tècniques ben conegudes anomenades Shape From X, on X es el mètode per obtenir la tercera dimensió, i varia en funció de la tècnica que s'utilitza a tal nalitat. Tot i que l'evolució cap a la càmera 3D va començar en els 90, cal que les tècniques per obtenir les formes tridimensionals siguin mes i mes acurades. Les aplicacions dels escàners 3D han augmentat considerablement en els darrers anys, especialment en camps com el lleure, diagnosi/cirurgia assistida, robòtica, etc. Una de les tècniques mes utilitzades per obtenir informació 3D d'una escena, es la triangulació, i mes concretament, la utilització d'escàners laser tridimensionals. Des de la seva aparició formal en publicacions científiques al 1971 [SS71], hi ha hagut contribucions per solucionar problemes inherents com ara la disminució d'oclusions, millora de la precisió, velocitat d'adquisició, descripció de la forma, etc. Tots i cadascun dels mètodes per obtenir punts 3D d'una escena te associat un procés de calibració, i aquest procés juga un paper decisiu en el rendiment d'un dispositiu d'adquisició tridimensional. La nalitat d'aquesta tesi es la d'abordar el problema de l'adquisició de forma 3D, des d'un punt de vista total, reportant un estat de l'art sobre escàners laser basats en triangulació, provant el funcionament i rendiment de diferents sistemes, i fent aportacions per millorar la precisió en la detecció del feix laser, especialment en condicions adverses, i solucionant el problema de la calibració a partir de mètodes geomètrics projectius.
Traditionally, the reproduction of the real world has been shown to us by means of at images. These images used to be materialised by means of paint on canvas, drawings or the like. Today, we still see hand made pictures, by fortune, although most of the images are acquired by cameras and they are either directly shown to an audience, like in the cinema, television or photographs, or they are processed by a computer system in order to obtain a particular result, like in industrial quality assurance or bleeding edge artificial intelligence research. Applying mid-level processing algorithms, 3D images can be obtained from 2D ones, using well known techniques called Shape From X, where X is the method for obtaining the 3rd dimension. While the evolution to the 3D camera begun in the 90s, the techniques for obtaining the most accurate 3D shape need to be continuously improving. The application of 3D scanners has spread signi cantly in the recent years, specially in elds like entertainment, assisted diagnosis/ surgery, robotics, etc. One of the most used techniques to obtain 3D information from a scene is triangulation, and more concretely, triangulationbased laser scanners. Since their formal appearance in scienti c publications, in 1971 [SS71], there have been contributions for solving inherent problems like occlusion avoidance, accuracy improvement, acquisition speed, shape description, etc. All of the methods for obtaining 3D points of a scene is accompained with a calibration procedure, and this procedure plays a decisive role in the performance of the acquisition device. The goal of this thesis is to provide a holistic approach to the problem of shape acquisition, giving a wide survey of triangulation laser scanners, testing the performance of di erent systems, and to give contributions for both improving acquisition accuracy under adverse conditions and solving the calibration problem. In addition, the calibration approach is based on previous works that used projective geometry to this end.
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9

Sztulzaft, Patrick. "Green-expert : un solveur généralisé associé à un générateur de formulations pour la méthode des intégrales de frontières." Grenoble INPG, 1994. https://hal.archives-ouvertes.fr/tel-01331763.

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Анотація:
De nombreux secteurs de l'industrie et de la recherche utilisent la modélisation des phénomènes de la physique des milieux continus. Les équations aux dérivées partielles décrivant ces phénomènes sont résolues à l'aide de diverses méthodes numériques. Les modélisations utilisées sont de plus en plus pointues, tant au niveau physique qu'au niveau numérique. Les réponses logicielles à ces problèmes doivent donc être évolutives. Ce travail s'insère dans une dynamique de recherche dans le domaine de la modélisation des phénomènes complexes qui a débuté avec l'élaboration du programme Flux-Expert®, basé sur la Méthode des Eléments Finis. Afin d'élargir le champ des possibilités offertes par ce programme, nous avons choisi d'y associer la Méthodes des Intégrales de Frontières. Dans cette optique, après une présentation didactique de la Méthode des Intégrales de Frontières, nous proposons une décomposition générale de la résolution numérique d'un problème à l'aide de cette méthode. Nous décrivons ensuite le logiciel issu de cette analyse : Green-Expert. L'originalité de la démarche réside dans l'association d'un programme Générateur de Formulations et d'un programme Solveur généralisé. Ce Solveur est capable de résoudre tout problème décrit à l'aide d'une formulation issue du Générateur et d'une Géométrie discrétisée. La dernière partie de ce mémoire est consacré à la validation. Des exemples de couplage entre la Méthode des Intégrales de Frontières et la Méthode des Éléments Finis sont présentés. Enfin, des exemples de résolution 2D et 3D permettent de valider le Générateur et le Solveur de Green-Expert
Investigations in many sectors of industry and research require the modelling of phenomena observed in the physics of continuous media. The partial differential equations describing these phenomena are solved using a wide range of numerical methods. The models used are increasingly sophisticated, from both a physical and numerical point of view. Software used to solve these problems must therefore be capable of evolving. This work is a continuation of research efforts devoted to the modelling of complex phenomena that began with the development of the Flux-Expert® program, based on the Finite Element Method. In order to extend the possibilities offered by this program, we decided to combine it with the Boundary Element Method. After reviewing the Boundary Element Method, we propose a general decomposition of the numerical solution of a problem using this method. We then describe the Green-Expert software developed on the basis of this analysis. The original aspect of the approach lies in the combination of a formulations generator and a general solver. This solver is capable of solving any problem described using a formulation coming from the Generator and a discrete geometry. The last part of this thesis is devoted to the validation phase. Examples of the combined use of the Boundary Elements and the Finite Element Methods are presented and examples of 2D and 3D resolution are used to validate the Green-Expert Solver and Generator
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10

Guessasm, Mohamed. "Contribution à la détermination des domaines de résistance de matériaux hétérogènes non périodiques." Université Joseph Fourier (Grenoble), 1999. http://www.theses.fr/1999GRE10010.

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Le travail realise a pour objet la determination des domaines de resistance macroscopiques de materiaux heterogenes non periodiques, dans le cadre de la theorie du calcul a la rupture. Afin de caracteriser le comportement non lineaire des materiaux aleatoirement heterogenes, le modele extremal heterogene (m. E. H. ) propose une formulation interessante dans le cas ou le comportement des materiaux constitutifs derive d'un potentiel. Un modele en contraintes, utilisant le cadre conceptuel du m. E. H. , est developpe. Ce modele concerne les materiaux dont le domaine de resistance est, soit convexe (dans ce cas il est identique au m. E. H. ), soit simplement etoile de centre l'origine des contraintes. Une application est realisee sur un materiau perfore aleatoirement. Le modele en contraintes adopte deux descriptions pour le materiau perfore. La premiere description est basee sur les fractions volumiques des materiaux constitutifs. La deuxieme description suppose que le materiau perfore aleatoirement est un agregat de plusieurs materiaux perfores periodiquement. Cette modelisation fournit une famille de domaines de resistance dependant d'un parametre d'heterogeneite r. Ce dernier est determine par calage des previsions numeriques aux resultats experimentaux pour une sollicitation donnee. Le domaine de resistance ainsi obtenu est valide par confrontation des previsions numeriques aux resultats experimentaux pour d'autres types de sollicitations. Parallelement a ce travail, des methodes de resolution sont developpees (a la fois simples et performantes) pour les problemes d'optimisation auxquels conduisent les approches en contraintes (du calcul a la rupture ou de l'homogeneisation). Sous des hypotheses relatives aux domaines de resistance, ces problemes d'optimisation, au depart sous conditions non lineaires, sont ramenes a des problemes d'infmax sans conditions avec une reduction significative du nombre de variables. Leur resolution est basee sur une methode de regularisation originale, effectuee sur une fonctionnelle independante de l'operateur max.
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Книги з теми "PIC method"

1

Trumbauer, Lisa. Fish pie. Worthington, OH: SRA/McGraw-Hill, 2000.

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2

H, James Ruby, Weinberg David S, and Atmospheric Research and Exposure Assessment Laboratory (U.S.), eds. Evaluation of POHC and PIC screening methods: Project summary. Research Triangle Park, NC: U.S. Environmental Protection Agency, Research and Development, Atmospheric Research and Exposure Assessment Laboratory, 1993.

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3

H, James Ruby, Weinberg David S, and Atmospheric Research and Exposure Assessment Laboratory (U.S.), eds. Evaluation of POHC and PIC screening methods: Project summary. Research Triangle Park, NC: U.S. Environmental Protection Agency, Research and Development, Atmospheric Research and Exposure Assessment Laboratory, 1993.

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4

The PIE method for career success. Indianapolis: JIST, 1996.

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5

Michael, Meg. Pick a pet. Worthington, OH: SRA McGraw-Hill, 1998.

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6

Pie graphs. Ann Arbor, Michigan: Cherry Lake Publishing, 2013.

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7

Khan, Marshall. A new method for auto-tuning PID controllers. Ottawa: National Library of Canada, 1995.

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8

Cocca, Lisa Colozza. Pie graphs. Ann Arbor, Mich: Cherry Lake Pub., 2013.

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9

Pick for professionals: Advanced methods and techniques. Blue Ridge Summit, PA: TAB Professional and Reference Books, 1990.

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10

1948-, Johnson Michael A., Moradi Mohammad H. 1967-, and Crowe J, eds. PID control: New identification and design methods. New York: Springer, 2005.

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Частини книг з теми "PIC method"

1

Cui, Wanzhao, Yun Li, Hongtai Zhang, and Jing Yang. "EM PIC Simulation of Multipactor." In Simulation Method of Multipactor and Its Application in Satellite Microwave Components, 137–77. Boca Raton: CRC Press, 2021. http://dx.doi.org/10.1201/9781003189794-4.

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2

Lee, Wen Ho, and D. Kwak. "On the PIC method for elastic-plastic flow." In Tenth International Conference on Numerical Methods in Fluid Dynamics, 403–8. Berlin, Heidelberg: Springer Berlin Heidelberg, 1986. http://dx.doi.org/10.1007/bfb0041824.

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Cui, Wanzhao, Yun Li, Hongtai Zhang, and Jing Yang. "PIC Simulation of Collector for TWT." In Simulation Method of Multipactor and Its Application in Satellite Microwave Components, 197–216. Boca Raton: CRC Press, 2021. http://dx.doi.org/10.1201/9781003189794-6.

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4

Kraeva, M. A., and V. E. Malyshkin. "Implementation of PIC method on MIMD multicomputers with assembly technology." In High-Performance Computing and Networking, 541–49. Berlin, Heidelberg: Springer Berlin Heidelberg, 1997. http://dx.doi.org/10.1007/bfb0031627.

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Chernykh, Igor, Vitaly Vshivkov, Galina Dudnikova, Tatyana Liseykina, Ekaterina Genrikh, Anna Efimova, Igor Kulikov, Ivan Chernoshtanov, and Marina Boronina. "High-Performance Simulation of High-Beta Plasmas Using PIC Method." In Communications in Computer and Information Science, 207–15. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-64616-5_18.

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Kraeva, M. A., and V. E. Malyshkin. "Algorithms of parallel realisation of the PIC method with assembly technology." In High-Performance Computing and Networking, 329–38. Berlin, Heidelberg: Springer Berlin Heidelberg, 1999. http://dx.doi.org/10.1007/bfb0100594.

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7

Ortwein, P., T. Binder, S. Copplestone, A. Mirza, P. Nizenkov, M. Pfeiffer, T. Stindl, S. Fasoulas, and C. D. Munz. "Parallel Performance of a Discontinuous Galerkin Spectral Element Method Based PIC-DSMC Solver." In High Performance Computing in Science and Engineering ‘14, 671–81. Cham: Springer International Publishing, 2014. http://dx.doi.org/10.1007/978-3-319-10810-0_44.

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8

Calderó, Gabriela, and Conxita Solans. "Polymeric O/W Nano-Emulsions Obtained by the Phase Inversion Composition (PIC) Method for Biomedical Nanoparticle Preparation." In Emulsion Formation and Stability, 199–207. Weinheim, Germany: Wiley-VCH Verlag GmbH & Co. KGaA, 2013. http://dx.doi.org/10.1002/9783527647941.ch7.

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Yang, Yongming, Xiwen Li, and Yao Chen. "The Influence of Different Excavation Methods on Deep Foundation Pit and Surrounding Environment." In Lecture Notes in Civil Engineering, 109–29. Singapore: Springer Singapore, 2022. http://dx.doi.org/10.1007/978-981-19-1260-3_11.

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AbstractTaking a deep foundation pit in Shijiazhuang, Beijing as the background of the project, combined with the excavation range of the deep foundation pit and the spatial location and geometry of the surrounding engineering bodies, FLAC3D software is used to establish a numerical model of the deep foundation pit excavation containing the deep foundation pit, surrounding buildings and underground tunnels and other engineering bodies. The numerical model truly reflects the geometric size and spatial location relationship between deep foundation pit and surrounding engineering bodies. Based on the numerical model, the numerical simulation of deep foundation pit excavation under different excavation methods was carried out. The analysis of the horizontal displacement of the support structure during the excavation of the deep foundation pit, the investigation of the surrounding buildings and surface settlement and the deformation of the metro tunnel. The influence mechanism of different excavation methods on the safety of deep foundation pit, surrounding buildings and tunnel were discussed. It is concluded that the excavation method has less influence on the deformation and displacement of the deep foundation pit and the surrounding buildings and tunnels under the condition of shallow excavation depth. As the excavation depth increases, the effect of the excavation method on the deformation of the deep foundation pit, buildings, tunnels and surface settlement increases. The layered excavation method is suitable for deep foundation pits with shallow excavation depths, while the layered section excavation method is more suitable for deep foundation pits with deep excavation depths. Deep foundation pit excavation has a smaller effect on the deformation of the tunnel. The surrounding buildings have a greater influence on the deformation during the excavation of the deep foundation pit, but the effect of the buildings on it is less than the limiting effect of the prestressing anchor cables on the deformation of the deep foundation pit.
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Bernat, Ivo. "Ultimate Less Radial Artery Occlusion Hemostasis Method on Slender PCI." In Slender PCI, 39–46. Singapore: Springer Singapore, 2020. http://dx.doi.org/10.1007/978-981-15-3777-6_6.

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Тези доповідей конференцій з теми "PIC method"

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HARIKRISHNAN, S., V. VENKATESWARA RAO, and MISRA AJAY. "TESTING A PRECISION INITIATION COUPLER BY DETONATION INDUCED CAVITY COLLAPSE METHOD." In 32ND INTERNATIONAL SYMPOSIUM ON BALLISTICS. Destech Publications, Inc., 2022. http://dx.doi.org/10.12783/ballistics22/36061.

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Precision Initiation Couplers (PIC) are used as a relay charge for initiating a shaped charge precisely along the liner axis. A PIC consists of an explosive column housed in an inert casing with suitable dimensions based on the detonation velocity of the explosive and shock velocity of the inert material. This paper explains a simple test method to qualitatively assess the performance of a PIC when it is eccentrically initiated. This method is based on the deformed shape of a plain cylindrical hole in an Aluminium block subjected to explosive loading. Symmetric collapse of the hole is observed when a PIC that is in contact with the metal block is detonated at a point away from the axis of the PIC. This test method can be used as a simple gonogo test for qualifying various designs of PICs.
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Peter, W., G. Gisler, H. Nash, J. Acquah, C. Lin, and D. Rine. "A gridding method for object-oriented PIC codes." In International Conference on Plasma Sciences (ICOPS). IEEE, 1993. http://dx.doi.org/10.1109/plasma.1993.593627.

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3

Deus, Clement, and Zhifang Liao. "Statistical consensus method for cluster ensembles." In 2010 International Conference on Progress in Informatics and Computing (PIC). IEEE, 2010. http://dx.doi.org/10.1109/pic.2010.5687411.

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Qi, Qing, Jian Cao, Yudong Tan, and Quanwu Xiao. "Cross-Domain Recommendation Method in Tourism." In 2018 IEEE International Conference on Progress in Informatics and Computing (PIC). IEEE, 2018. http://dx.doi.org/10.1109/pic.2018.8706265.

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5

Liuliu Huang, Shumin Shi, and Heyan Huang. "A new method for Code Similarity Detection." In 2010 International Conference on Progress in Informatics and Computing (PIC). IEEE, 2010. http://dx.doi.org/10.1109/pic.2010.5687856.

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6

Fei, Xiang, and Chuansheng Liu. "Multi-granular method for retrieving Thangka images." In 2014 International Conference on Progress in Informatics and Computing (PIC). IEEE, 2014. http://dx.doi.org/10.1109/pic.2014.6972293.

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Luo, Dechao, Xiaobo Lu, Changhui Hu, Xiang Peng, and Wei Wang. "A robust traffic driver face detection method." In 2016 International Conference on Progress in Informatics and Computing (PIC). IEEE, 2016. http://dx.doi.org/10.1109/pic.2016.7949511.

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Jing Li, Yundong Cao, Xiaoming Liu, Jiyan Zou, and Chunguang Hou. "Simulation on SF6 gas discharge by PIC-MCC method." In 2009 IEEE 9th International Conference on the Properties and Applications of Dielectric Materials (ICPADM). IEEE, 2009. http://dx.doi.org/10.1109/icpadm.2009.5252327.

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9

Vshivkova, L. V., and G. I. Dudnikova. "Numerical modeling of plasma phenomena using the PIC-method." In 2012 XXVth International Symposium on Discharges and Electrical Insulation in Vacuum (ISDEIV 2012). IEEE, 2012. http://dx.doi.org/10.1109/deiv.2012.6412538.

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10

Dai, YanGe, Lizhen Liu, Wei Song, Chao Du, and Xinlei Zhao. "The realization of identification method for DataMatrix code." In 2017 International Conference on Progress in Informatics and Computing (PIC). IEEE, 2017. http://dx.doi.org/10.1109/pic.2017.8359582.

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Звіти організацій з теми "PIC method"

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Clarke, Mary, and Jordan Musser. The MFiX Particle-in-Cell Method (MFiX-PIC) Theory Guide. Office of Scientific and Technical Information (OSTI), May 2020. http://dx.doi.org/10.2172/1630414.

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2

Clarke, Mary, and Jordan Musser. The MFiX Particle-in-Cell Method (MFiX-PIC) Theory Guide. Office of Scientific and Technical Information (OSTI), May 2020. http://dx.doi.org/10.2172/1630426.

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3

Pointon, T. D. A method for handling slanted conducting surfaces in EM PIC codes. Office of Scientific and Technical Information (OSTI), June 1988. http://dx.doi.org/10.2172/6998279.

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4

Zheng, Jinhui, Matteo Ciantia, and Jonathan Knappett. On the efficiency of coupled discrete-continuum modelling analyses of cemented materials. University of Dundee, December 2021. http://dx.doi.org/10.20933/100001236.

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Computational load of discrete element modelling (DEM) simulations is known to increase with the number of particles. To improve the computational efficiency hybrid methods using continuous elements in the far-field, have been developed to decrease the number of discrete particles required for the model. In the present work, the performance of using such coupling methods is investigated. In particular, the coupled wall method, known as the “wall-zone” method when coupling DEM and the continuum Finite Differences Method (FDM) using the Itasca commercial codes PFC and FLAC respectively, is here analysed. To determine the accuracy and the efficiency of such a coupling approach, 3-point bending tests of cemented materials are simulated numerically. To validate the coupling accuracy first the elastic response of the beam is considered. The advantage of employing such a coupling method is then investigated by loading the beam until failure. Finally, comparing the results between DEM, DEM-FDM coupled and FDM models, the advantages and disadvantages of each method are outlined.
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Tschopp, Daniel, Pierre Delmas, Mathieu Rhedon, Sacha Sineux, Alexis Gonnelle, Philip Ohnewein, and Jan Erik Nielsen. Application of PC Method to Large Collector Arrays. IEA SHC Task 55, February 2021. http://dx.doi.org/10.18777/ieashc-task55-2021-0005.

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The Performance Check (PC) method can be used for a simple check of the collector array performance of a solar thermal plant. It has been proposed recently as an input to a new ISO standard. This fact sheet provides an application of the PC method to large collector arrays. The goal of this fact sheet is to evaluate the methodology and provide practical insights for the application of the PC method.
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Cavers, D. S., G. H. Baldwin, T. Hannah, and R. K. Singhal. Design methods for open pit coal mine footwalls. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 1986. http://dx.doi.org/10.4095/304972.

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7

Bailey, Sharon A., James M. Alzheimer, Carl P. Baker, Jonathan T. Smalley, Joseph C. Tucker, and Patrick L. Valdez. Remote Pit Operation Enhancement System: Concept Selection Method and Evaluation Criteria. Office of Scientific and Technical Information (OSTI), September 1999. http://dx.doi.org/10.2172/15009666.

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Tanner, David J. Energy Calibration of the BaBar EMC Using the Pi0 Invariant Mass Method. Office of Scientific and Technical Information (OSTI), April 2007. http://dx.doi.org/10.2172/901853.

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Andraka, C. E., G. A. Knorovsky, and C. A. Drewien. Boundary element method applied to a gas-fired pin-fin-enhanced heat pipe. Office of Scientific and Technical Information (OSTI), February 1998. http://dx.doi.org/10.2172/672137.

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Ingerly, D. B., W. A. Ellingson, N. Vasanthamohan, and C. Wu. Use of x-ray imaging for evaluation of superconducting ceramics fabricated by PIT method. Office of Scientific and Technical Information (OSTI), August 1993. http://dx.doi.org/10.2172/188645.

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