Bibliografías temáticas / HPTM

Literatura académica sobre el tema "HPTM"

Autor: Grafiati

Publicado: 6 de julio de 2024

Crea una cita precisa en los estilos APA, MLA, Chicago, Harvard y otros

Elija tipo de fuente:

Consulte las listas temáticas de artículos, libros, tesis, actas de conferencias y otras fuentes académicas sobre el tema "HPTM".

Junto a cada fuente en la lista de referencias hay un botón "Agregar a la bibliografía". Pulsa este botón, y generaremos automáticamente la referencia bibliográfica para la obra elegida en el estilo de cita que necesites: APA, MLA, Harvard, Vancouver, Chicago, etc.

También puede descargar el texto completo de la publicación académica en formato pdf y leer en línea su resumen siempre que esté disponible en los metadatos.

Artículos de revistas sobre el tema "HPTM":

Lins, Rodrigo, Pedro Rosalen, Diego Silva, Bianca Kawabata, Luís Roberto Martins y Vanessa Cavalli. "A Titanium Tetrafluoride Experimental Gel Combined with Highly Concentrated Hydrogen Peroxide as an Alternative Bleaching Agent: An In Vitro Study". Gels 8, n.º 3 (14 de marzo de 2022): 178. http://dx.doi.org/10.3390/gels8030178.

Texto completo

Los estilos APA, Harvard, Vancouver, ISO, etc.

Resumen

This in vitro study evaluated color change, mineral content, and morphology of enamel, pH and cytotoxicity of experimental bleaching agents containing 35% hydrogen peroxide (HP), titanium tetrafluoride (TiF4), Natrosol, and Chemygel. Sixty enamel/dentin blocks were randomly treated with (n = 10) HP; HP+Natrosol+Chemygel with different TiF4 concentrations: 0.05 g HPT0.5, 0.1 g HPT1, 0.2 g HPT2, 0.3 g HPT3, 0.4 g HPT4. Bleaching was performed in three sessions (3 × 15 min application). Color change (CIELab-ΔEab, CIEDE2000-ΔE00, ΔWID) and Knoop microhardness (KHN) were evaluated. Enamel morphology and composition were observed under scanning electron microscopy and energy-dispersive spectrometry (EDS), respectively. Cell viability of keratinocyte cells was evaluated using MTT assay. Data were analyzed by one-way ANOVA and LSD and Tukey tests, and two-way repeated measures ANOVA and Bonferroni (α = 5%). The pH and EDS were analyzed descriptively. Lightness-L* increased, and a* and b* parameters decreased, except for HPT3 and HPT4 (b*). HPT0.5, HPT1, and HPT2 exhibited ΔEab and ΔWID similar to HP. ΔE00 did not present statistical difference. HP, HPT0.5, and HPT1 promoted higher KHN. HPT0.5 exhibited no changes on enamel surface. Keratinocyte cells were viable when treated with T0.5, and weak viable for T1. Experimental agents exhibited acidic pH and Ti elements. HPT0.5 exhibited bleaching efficacy, maintained KHN without enamel alterations, and did not increase cytotoxicity.

Jawarneh, Yousef, Humaira Yasmin, M. Mossa Al-Sawalha, Rasool Shah y Asfandyar Khan. "Numerical analysis of fractional heat transfer and porous media equations within Caputo-Fabrizio operator". AIMS Mathematics 8, n.º 11 (2023): 26543–60. http://dx.doi.org/10.3934/math.20231356.

Texto completo

Los estilos APA, Harvard, Vancouver, ISO, etc.

Resumen

<abstract><p>This paper presents a comparative study of two popular analytical methods, namely the Homotopy Perturbation Transform Method (HPTM) and the Adomian Decomposition Transform Method (ADTM), to solve two important fractional partial differential equations, namely the fractional heat transfer and porous media equations. The HPTM uses a perturbation approach to construct an approximate solution, while the ADTM decomposes the solution into a series of functions using the Adomian polynomials. The results obtained by the HPTM and ADTM are compared with the exact solutions, and the performance of both methods is evaluated in terms of accuracy and convergence rate. The numerical results show that both methods are efficient in solving the fractional heat transfer and porous media equations, and the HPTM exhibits slightly better accuracy and convergence rate than the ADTM. Overall, the study provides a valuable insight into the application of the HPTM and ADTM in solving fractional differential equations and highlights their potential for solving complex mathematical models in physics and engineering.</p></abstract>

KEHAILI, ABDELKADER, ABDELKADER BENALI y ALI HAKEM. "HOMOTOPY PERTURBATION TRANSFORM METHOD FOR SOLVING SYSTEMS OF NONLINEAR PARTIAL FRACTIONAL DIFFERENTIAL EQUATIONS". Journal of Science and Arts 21, n.º 2 (30 de junio de 2021): 355–64. http://dx.doi.org/10.46939/j.sci.arts-21.2-a04.

Texto completo

Los estilos APA, Harvard, Vancouver, ISO, etc.

Resumen

In this paper, we apply an efficient method called the Homotopy perturbation transform method (HPTM) to solve systems of nonlinear fractional partial differential equations. The HPTM can easily be applied to many problems and is capable of reducing the size of computational work.

Xu, Huiwen, Maoyan Wu, Xiumei Ma, Wei Huang y Yong Xu. "Function and Mechanism of Novel Histone Posttranslational Modifications in Health and Disease". BioMed Research International 2021 (3 de marzo de 2021): 1–13. http://dx.doi.org/10.1155/2021/6635225.

Texto completo

Los estilos APA, Harvard, Vancouver, ISO, etc.

Resumen

Histone posttranslational modifications (HPTMs) are crucial epigenetic mechanisms regulating various biological events. Different types of HPTMs characterize and shape functional chromatin states alone or in combination, and dedicated effector proteins selectively recognize these modifications for gene expression. The dysregulation of HPTM recognition events takes part in human diseases. With the application of mass spectrometry- (MS-) based proteomics, novel histone lysine acylation has been successively discovered, e.g., propionylation, butyrylation, 2-hydroxyisobutyrylation, β-hydroxybutyrylation, malonylation, succinylation, crotonylation, glutarylation, and lactylation. These nine types of modifications expand the repertoire of HPTMs and regulate chromatin remodeling, gene expression, cell cycle, and cellular metabolism. Recent researches show that HPTMs have a close connection with the pathogenesis of cancer, metabolic diseases, neuropsychiatric disorders, infertility, kidney diseases, and acquired immunodeficiency syndrome (AIDS). This review focuses on the chemical structure, sites, functions of these novel HPTMs, and underlying mechanism in gene expression, providing a glimpse into their complex regulation in health and disease.

Hu, Qiwen, Casey S. Greene y Elizabeth A. Heller. "Specific histone modifications associate with alternative exon selection during mammalian development". Nucleic Acids Research 48, n.º 9 (22 de abril de 2020): 4709–24. http://dx.doi.org/10.1093/nar/gkaa248.

Texto completo

Los estilos APA, Harvard, Vancouver, ISO, etc.

Resumen

Abstract Alternative splicing (AS) is frequent during early mouse embryonic development. Specific histone post-translational modifications (hPTMs) have been shown to regulate exon splicing by either directly recruiting splice machinery or indirectly modulating transcriptional elongation. In this study, we hypothesized that hPTMs regulate expression of alternatively spliced genes for specific processes during differentiation. To address this notion, we applied an innovative machine learning approach to relate global hPTM enrichment to AS regulation during mammalian tissue development. We found that specific hPTMs, H3K36me3 and H3K4me1, play a role in skipped exon selection among all the tissues and developmental time points examined. In addition, we used iterative random forest model and found that interactions of multiple hPTMs most strongly predicted splicing when they included H3K36me3 and H3K4me1. Collectively, our data demonstrated a link between hPTMs and alternative splicing which will drive further experimental studies on the functional relevance of these modifications to alternative splicing.

Chen, Tiejun. "Soliton Solutions of Kaup-Kupershimdt Equation Using HPTM". Journal of Physics: Conference Series 2173, n.º 1 (1 de enero de 2022): 012022. http://dx.doi.org/10.1088/1742-6596/2173/1/012022.

Texto completo

Los estilos APA, Harvard, Vancouver, ISO, etc.

Resumen

Abstract In this paper, we employ the idea of homotopy perturbation transform method(HPTM), which is a combination of Laplace transformation and homotopy perturbation method(HPM) for solving nonlinear ordinary and partial differential equations. The equations are Laplace transformed and nonlinear terms are represented by He’s polynomials. The solutions are obtained in the series form which converges at fast rate with easily computable terms. Comparison of standard perturbation method shows that HPTM is appropriate even for system without any small/large parameters and therefore it can be applied more extensively than traditional perturbation techniques. HPTM is used to obtain soliton solution of Kaup-kupershimdt(KK) equation, which is modified form of fifth order KdV equation. Numerical results are presented in tabular form to show the accuracy, efficiency and reliability of this method.

Singh, Jagdev y Devendra Kumar. "Homotopy Perturbation Algorithm Using Laplace Transform for Gas Dynamics Equation". Journal of Applied Mathematics, Statistics and Informatics 8, n.º 1 (1 de mayo de 2012): 55–61. http://dx.doi.org/10.2478/v10294-012-0006-2.

Texto completo

Los estilos APA, Harvard, Vancouver, ISO, etc.

Resumen

Homotopy Perturbation Algorithm Using Laplace Transform for Gas Dynamics EquationIn this paper, we apply a combined form of the Laplace transform method with the homotopy perturbation method to obtain the solution of nonlinear gas dynamics equation. This method is called the homotopy perturbation transform method (HPTM). This technique finds the solution without any discretization or restrictive assumptions and avoids the round-off errors. The fact that this scheme solves nonlinear problems without using Adomian's polynomials can be considered as a clear advantage of this algorithm over the decomposition method. The results reveal that the homotopy perturbation transform method (HPTM) is very efficient, simple and can be applied to other nonlinear problems.

Wang, Mingxing, Qiong Guo, Kongfu Zhu, Bo Fang, Yifan Yang, Maikun Teng, Xu Li y Yuyong Tao. "Interface switch mediates signal transmission in a two-component system". Proceedings of the National Academy of Sciences 117, n.º 48 (16 de noviembre de 2020): 30433–40. http://dx.doi.org/10.1073/pnas.1912080117.

Texto completo

Los estilos APA, Harvard, Vancouver, ISO, etc.

Resumen

Two-component systems (TCS), which typically consist of a membrane-embedded histidine kinase and a cytoplasmic response regulator, are the dominant signaling proteins for transduction of environmental stimuli into cellular response pathways in prokaryotic cells. HptRSA is a recently identified TCS consisting of the G6P-associated sensor protein (HptA), transmembrane histidine kinase (HptS), and cytoplasmic effector (HptR). HptRSA mediates glucose-6-phosphate (G6P) uptake to supportStaphylococcus aureusgrowth and multiplication within various host cells. How the mechanism by which HptRSA perceives G6P and triggers a downstream response has remained elusive. Here, we solved the HptA structures in apo and G6P-bound states. G6P binding in the cleft between two HptA domains caused a conformational closing movement. The solved structures of HptA in complex with the periplasmic domain of HptS showed that HptA interacts with HptS through both constitutive and switchable interfaces. The G6P-free form of HptA binds to the membrane-distal side of the HptS periplasmic domain (HptSp), resulting in a parallel conformation of the HptSp protomer pair. However, once HptA associates with G6P, its intramolecular domain closure switches the HptA-HptSp contact region into the membrane-proximal domain, which causes rotation and closure of the C termini of each HptSp protomer. Through biochemical and growth assays of HptA and HptS mutant variants, we proposed a distinct mechanism of interface switch-mediated signaling transduction. Our results provide mechanistic insights into bacterial nutrient sensing and expand our understanding of the activation modes by which TCS communicates external signals.

Singh, Jagdev, Devendra Kumar y Sunil Kumar. "A New Fractional Model of Nonlinear Shock Wave Equation Arising in Flow of Gases". Nonlinear Engineering 3, n.º 1 (1 de marzo de 2014): 43–50. http://dx.doi.org/10.1515/nleng-2013-0022.

Texto completo

Los estilos APA, Harvard, Vancouver, ISO, etc.

Resumen

Abstract In this paper, we present a numerical algorithm based on new homotopy perturbation transform method (HPTM) to solve a time-fractional nonlinear shock wave equation which describes the flow of gases. The fractional derivative is considered in the Caputo sense. The HPTM is combined form of Laplace transform, homotopy perturbation method and He’s polynomials. The nonlinear terms can be easily handled by the use of He’s polynomials. The technique finds the solution without any discretization or restrictive assumptions and avoids the round-off errors. The obtained results are in good agreement with the existing ones in open literature and it is shown that the technique introduced here is robust, efficient, easy to implement and computationally very attractive.

Kumar, Sunil, Huseyin Kocak y Ahmet Yıldırım. "A Fractional Model of Gas Dynamics Equations and its Analytical Approximate Solution Using Laplace Transform". Zeitschrift für Naturforschung A 67, n.º 6-7 (1 de julio de 2012): 389–96. http://dx.doi.org/10.5560/zna.2012-0038.

Texto completo

Los estilos APA, Harvard, Vancouver, ISO, etc.

Resumen

In this study, the homotopy perturbation transform method (HPTM) is performed to give approximate and analytical solutions of nonlinear homogenous and non-homogenous time-fractional gas dynamics equations. Gas dynamics equations are based on the physical laws of conservation, namely, the laws of conservation of mass, conservation of momentum, conservation of energy etc. The HPTM is a combined form of the Laplace transform, the homotopy perturbation method, and He’s polynomials. The nonlinear terms can be easily handled by the use of He’s polynomials. The numerical solutions obtained by the proposed method indicate that the approach is easy to implement and accurate. Some numerical illustrations are given. These results reveal that the proposed method is very effective and simple to perform

Más fuentes

Tesis sobre el tema "HPTM":

Zhu, Yumei y August Österle. "China's policy experimentation on long-term care insurance: Implications for access". Wiley, 2019. http://dx.doi.org/10.1002/hpm.2879.

Texto completo

Los estilos APA, Harvard, Vancouver, ISO, etc.

Resumen

China's population is aging rapidly, while the traditional long-term care (LTC) system that heavily relies on families is eroding. In response, China has embarked on a journey of policy experimentation for long-term care insurance (LTCI) since 2016, launching LTCI pilots in 15 pioneer cities. These pilots have a great diversity in participation, eligibility, and provision. This paper estimates the prevalence of LTC needs and analyzes the impact of the LTCI pilots on access. Although substantial progress has been achieved, the overall coverage of LTCI is still relatively small, and a large proportion of vulnerable people needing LTC seem to be left behind because of the strict eligibility criteria. This analysis suggests that future policy experimentation on LTCI reform in China needs to address the following pressing policy issues: expanding the coverage of LTCI; narrowing rural-urban disparities in access; improving access for vulnerable subpopulations; and reducing the heavy reliance on institutional care.

Eriksson, Kjell. "HPM-vapen vs. kommersiell UAV". Thesis, Försvarshögskolan, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:fhs:diva-6273.

Texto completo

Los estilos APA, Harvard, Vancouver, ISO, etc.

Resumen

Detta arbete i militärteknik studerar om högeffektpulsad mikrovågsstrålning kan uppnå verkan mot kommersiella UAV. Analysen genomförs på två olika icke-dödliga HPM-vapen. Data hämtas från ett scenario där vapenverkan innebär hög risk för skada på tredje man. En Försvarsmaktsstudie har konstaterat att Luftvärnsbataljon saknar förmåga att verka mot små UAV.Dagsaktuell kunskap har inhämtats om scenariots miljö samt från forskning och industri genom studiebesök. Inhämtad kunskap har möjliggjort en logisk-matematisk parameterstudie på ett scenario med militärtekniskt perspektiv. Analysens slutsatser är att kommersiella UAV innehar låg skyddsnivå, att beslut om insats underlättas i alla miljöer och att en elektronisk sköld i form av HPM-vapen skyddar en stor volym samtidigt. HPM-vapen kan inte som ensamt vapensystem stå för skydd och uppnå säkerställd verkan mot kommersiell UAV. HPM-vapen kan däremot komplettera övriga verkanssystem och göra luftförsvaret starkare genom system av system. HPM-vapen kan bidra till att minska ett befintligt förmågeglapp mot kommersiella UAV.
This paper in military technology discusses whether high power microwaves can affect commercial UAVs. Two non-lethal HPM-weapons are analyzed. The data is collected from a scenario where there is a high risk for collateral damage. A Swedish Armed Forces study stated that the Air Defence Battalion lacks ability to affect small UAVs. The latest knowledge is obtained from the environment in the scenario, from research and from the industry. This knowledge has enabled a logical-mathematical parametric study on the scenario within a military perspective. The result of the study is the assessment that commercial UAVs are assessed to have low protection factor, facilitates decision to act in all environments and provides an electronic shield protection of a large surface at the same time. HPM-weapons can´t stand as a single system for protection against commercial UAVs and achieve guaranteed effect. However, HPM-weapons can complement other weapon systems and thus make the air defense stronger through systems of systems. HPM-weapons can reduce the capability deficiency against commercial UAVs.

Kreitlow, Matthias [Verfasser]. "Analyse von HPEM-Störungseffekten in Computer-Netzwerken / Matthias Kreitlow". Düren : Shaker, 2019. http://d-nb.info/1196487332/34.

Texto completo

Los estilos APA, Harvard, Vancouver, ISO, etc.

Lanzrath, Marian [Verfasser] y Holger [Akademischer Betreuer] Hirsch. "HPEM-Verwundbarkeit des Smart Grid / Marian Lanzrath ; Betreuer: Holger Hirsch". Duisburg, 2020. http://d-nb.info/1216038899/34.

Texto completo

Los estilos APA, Harvard, Vancouver, ISO, etc.

Narahara, Sheryl K. "Occupational narratives of human performance technology (HPT)". [Bloomington, Ind.] : Indiana University, 2008. http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:dissertation&res_dat=xri:pqdiss&rft_dat=xri:pqdiss:3329712.

Texto completo

Los estilos APA, Harvard, Vancouver, ISO, etc.

Resumen

Thesis (Ph.D.)--Indiana University, Dept. of Instructional Technology, 2008.
Title from PDF t.p. (viewed on Jul 19, 2010). Source: Dissertation Abstracts International, Volume: 69-10, Section: A, page: 3919. Adviser: Thomas Schwen. Includes supplementary digital materials.

Wessman, Thomas. "HPM som luftvärnsvapen mot kryssningsmissiler, en möjlighet?" Thesis, Försvarshögskolan, 2005. http://urn.kb.se/resolve?urn=urn:nbn:se:fhs:diva-1640.

Texto completo

Los estilos APA, Harvard, Vancouver, ISO, etc.

Resumen

I denna uppsats undersöks huruvida HPM (High Power Microwaves) kan användas som enverkansform i framtida luftvärnssystem för att bekämpa kryssningsmissiler. Studien undersökervilket hot kryssningsmissiler kan utgöra, hur de är konstruerade och hur HPM kan påverka dem.Uppsatsen redogör för hur det nya luftvärnskonceptet är uppbyggt och vilka krav på förmågor somställs på framtida luftvärnssystem. Den undersöker även hur ett HPM-system är uppbyggt ochvilken verkan det kan ha på elektriska system i en kryssningsmissil. Vidare diskuteras vilkeneffekt tre olika HPM-system kan ha mot kryssningsmissiler kopplat till de krav som ställs iluftvärnskonceptet.Huvudslutsatsen indikerar att HPM-system kan ha verkan mot kryssningsmissiler. HPM-systemkan nyttjas främst i scenarier där det ställs höga krav på eldhastigheten mot kryssningsmissiler påkorta avstånd. Ett problem är att det är svårt att utvärdera och konstatera skadeeffekten ikryssningsmissilen.
Avdelning: ALB - Slutet Mag 3 C-uppsHylla: Upps. ChP T 03-05

SILVA, Tatiane Sousa. "Planejamento em saúde: interação entre gestores & usuários no HPSM Mário Pinotti". Universidade Federal do Pará, 2011. http://repositorio.ufpa.br/jspui/handle/2011/2961.

Texto completo

Los estilos APA, Harvard, Vancouver, ISO, etc.

Resumen

Submitted by Ana Rosa Silva (arosa@ufpa.br) on 2012-09-13T16:01:52Z No. of bitstreams: 2 license_rdf: 23898 bytes, checksum: e363e809996cf46ada20da1accfcd9c7 (MD5) Dissertacao_PlanejamentoSaudeInteracao.pdf: 7443130 bytes, checksum: 5029c5dc98a7e2dce6724966dbda31b5 (MD5)
Approved for entry into archive by Ana Rosa Silva(arosa@ufpa.br) on 2012-09-13T16:02:29Z (GMT) No. of bitstreams: 2 license_rdf: 23898 bytes, checksum: e363e809996cf46ada20da1accfcd9c7 (MD5) Dissertacao_PlanejamentoSaudeInteracao.pdf: 7443130 bytes, checksum: 5029c5dc98a7e2dce6724966dbda31b5 (MD5)
Made available in DSpace on 2012-09-13T16:02:29Z (GMT). No. of bitstreams: 2 license_rdf: 23898 bytes, checksum: e363e809996cf46ada20da1accfcd9c7 (MD5) Dissertacao_PlanejamentoSaudeInteracao.pdf: 7443130 bytes, checksum: 5029c5dc98a7e2dce6724966dbda31b5 (MD5) Previous issue date: 2011
Planejar em Saúde não é um tema que se restrinja a uma única matriz disciplinar. Para tratá-lo é necessário buscar em diversas áreas do conhecimento numa perspectiva “transdisciplinar”. Nesta pesquisa tentarei compreender e assimilar novas formas de gestão na saúde para o HPSM Mario Pinotti (Belém-Pará) que não estejam, em sua essência, apenas representando uma capitulação diante de uma conjuntura difícil, ou em outras palavras sucumbindo diante das dificuldades atuais dos problemas advindos de uma sociedade moderna e com interesses tão múltiplos quantos seus atores. Partimos da manifestação da necessidade de proximidade entre as pessoas, no contexto da humanização da relação de pesquisa, requer uma postura de valorização da vida acima de qualquer processo estrutural e/ou técnicocientífico. Por esse motivo escolhemos Bourdieu como principal referência para uma pesquisa etnográfica em um ambiente micropolítico, sob a perspectiva do estabelecimento de uma relação compreensiva com os atores sociais atuantes. Esta opção metodológica é fundamental para a compreensão do objeto proposto, o que dificilmente pode ser feito a partir da escolha de procedimentos simplificados, tais como entrevistas padronizadas e pontuais. O que se abstraiu dos resultados desta pesquisa é que existe um anseio por parte dos gestores e profissionais em adequar a demanda do hospital à capacidade do hospital e não o contrário. Entretanto, é necessário que haja um equilíbrio entre ambos para que o planejamento atinja o objetivo proposto que é o de ordenar os recursos financeiros e humanos com máxima eficiência possível. Políticas e estratégias devem ser consideradas sob a égide de um planejamento participativo promovendo um diálogo entre os que dependem do sistema e trabalham no/para o sistema.
Make plans in the area of health is not an issue that is confined to a single disciplinary matrix. To treat it is necessary to look at different areas of knowledge from a "transdisciplinary" perspective. In this research I will try to understand and assimilate new forms of management in health for HPSM Mario Pinotti (Belém-Pará) that it's not in its essence, merely representing a capitulation to a difficult economic situation, or in other words, succumbing before the current difficulties of the problems arising from a modern society with interests such as multiple than their actors. We started from need for proximity between people, in the context of the humanization of the relationship of research requires an attitude of valuing life above any structural process and / or technical-scientific. For this reason we chose as the main reference to Bourdieu's ethnographic research in an environment micro political from the perspective of establishing a comprehensive relationship with social actors acting. This methodological approach is fundamental to understanding the proposed object, which can hardly be made from the choice of simplified procedures like punctual interviews. What is abstracted from the results of this research is that there is a yearning on the part of managers and professionals in adapting to the demands to the hospital capacity of the hospital and not vice versa. However, there must be a balance between both that the proposed design achieves the goal that is the sort of financial and human resources with maximum efficiency possible. Policies and strategies must be considered under the aegis of a participatory planning by promoting a dialogue between those who depend on the system and work in / for the system.

Rosales, Marc. "Study of SiGe HPT for radio over fiber applications". Thesis, Paris Est, 2014. http://www.theses.fr/2014PEST1101/document.

Texto completo

Los estilos APA, Harvard, Vancouver, ISO, etc.

Resumen

Ce travail de thèse présente le développement de phototransistors bipolaires à hétérojonction (HPT) SiGe/Si mis en œuvre dans une technologie de processus 80GHz SiGe bipolaire pour des applications de transmission Radio-sur-Fibre. Le cas particuliers d'un réseau domestique sans fil à infrastructure optique est considéré pour lequel le critère de coût est prépondérant. Le fonctionnement des ce HPT SiGe/Si est étudié sous une longueur d'onde optique de 850 nm en exploitant des fibres optique multimode (MMF) suffisantes pour les besoins de bande passante dans un environnement de réseau domestique. Le HPT SiGe/Si est également développé dans l'objectif de permettre une intégration combiné du photorécepteur et circuit intégré monolithiquement, conduisant à des structures de type Opto-electronic Microwave Monolithically Integrated Circuit (OE-MMIC), visant à poursuivre l'intégration et la réduction des cours. Deux topologies ont été explorées principalement: 1) une topologie avec élargissement de la base et du collecteur (xBC HPT) et 2) une topologie avec élargissement des trois régions de base, émetteur et collecteur simultanément (xEBC HPT). Des variations technologies ont été réalisées et analysées en détail, à la fois en terme de couches verticales que de dessin de masque (layout). Les mesures ont démontré la validité technologique de chacune de ces approches, et permis d'isoler l'impact sur les performances statiques et dynamiques de chacune de ces couches. Une solution de type xEBC se montre ainsi préférable pour le cas de composants de petites dimensions inférieure à 50x50µm², dans la bande du GHz. Les phototransistors sont développés dans une configuration à trois terminaux (3T-HPT). Le type de polarisation de la base du HPT influe également sur la responsivité du phototransistor. Une polarisation de courant constant (CC) démontre une plus grande responsivité par rapport au cas d'une polarisation en tension ( CV). Une analyse détaillée montre aussi les différences de responsivité mesurées en continue et celles mesurées en basse fréquence à 50MHz. La connexion de base permet également de varier l'impédance de charge présentée sur celle-ci. La théorie de l'adaptation des phototransistors est rappelée. L'effet de différentes impédances de base sont étudiées par la simulation et la mesure des circuits réalisés technologiquement. L'intégration du phototransistor au sein d'un circuit élémentaire est enfin explorée. Différentes configurations de paires HPT - HBT sont étudiées, formant des circuits élémentaires. Des caractérisations expérimentales permettent de vérifier l'amélioration apportées par ces topologies par rapport au phototransistor unique. Enfin, un phototransistor SiGe en configuraiton 2T-HPT est utilisé et intégré avec succès pour la première fois au sein d'un module de type Receiving Optical Sub Assembly (ROSA) pour la mise au point d'une transmission Radio-sur-Fibre multiGigabit par seconde pour un réseau domestique
This research is focused on the study of silicon germanium based heterojunction bipolar phototransistors (SiGe HPTs) implemented in an 80GHz SiGe Bipolar process technology. It's application in a radio over fiber system for home area networks are investigated. RoF for Home area networks are envisioned to implemented with a minimal system cost. Operation at 850nm is identified as a critical parameter to achieve this goal. Low cost off the shelf optical components are readily available at this wavelength. The use of multi mode fibers (MMF) as opposed to higher cost single mode fiber (SMF) is sufficient for the bandwidth requirements in a home network environment. A monolithically integrated OE receiver chip would help in the overall reduction of the system cost by having the optical detector in the same chip with the electronic circuits. We have designed and implemented three terminal HPT (3T-HPT) structures. The two main groups of the HPT structures are: 1) HPTs with extended Base and Collector regions (xBC HPT) and 2) HPTs with extended Emitter, Base and Collector regions (xEBC HPT). Variations to improve optical coupling the though optimizations in the vertical stack and lateral size of the HPT. The measurements and characterization showed that all the structures are compatible with the process technology. The type of biasing used in the base of the HPT also influences the HPT performance. A constant current (CC) bias has higher extracted DC responsivity as compared to a constant voltage (CV) bias. The effects of the different passive base loads on the HPT responsivity are studied through simulation and measurement of fabricated circuits. The impedance presented on the base has a great influence on the HPT responsivity. The performance of an HPT as circuit component is studied using different HPT-HBT pair configurations. Tests and measurements verify that improvement in the classical transistor pair configurations are also present in the opto microwave response of the HPT-HBT pair. Finally, SiGe hpt is used in the development of a ROSA module for a radio over fiber systems for home area network

Arzaghi, Mandana. "Nouveau procédé d'hyperdéformation pour les tubes". Thesis, Metz, 2010. http://www.theses.fr/2010METZ031S.

Texto completo

Los estilos APA, Harvard, Vancouver, ISO, etc.

Resumen

La nouvelle technique d'hyperdéformation nommée High Pressure Tube Twisting (HPTT), est un procédé continu d'affinement du grain pour les matériaux métalliques avec la géométrie tubulaire. Il consiste à placer un mandrin dans le tube avant d'appliquer une compression axiale directement sur le tube confiné des deux côtés pour produire une pression hydrostatique importante. Le tube est ensuite cisaillé par un couple externe à l'aide de la force de frottement généré par la pression hydrostatique. Les structures ultrafines produit avec HPTT ont été confirmés par MET et leur propriétés mécaniques ont été évaluées. La limite d'élasticité est augmentée de façon monotone avec la déformation imposée par HPTT. L'évolution de la microstructure est étudiée par la technique EBSD et les mesures de texture ont été réalisées avec des rayons X. Les échantillons déformés ont la texture de cisaillement simple, avec des intensités relativement faibles et l'effet de la texture initiale sur la texture finale persiste jusqu'à un cisaillement de 6. La distribution des désorientations entre les grains est bimodale et le second pic augmente avec la déformation. Application industrielle de cette nouvelle technique SPD exige la modélisation avancée en termes d'évolution de texture et le processus de fragmentation des grains. Dans ce but, le nouveau modèle de fragmentation du grain proposé par Toth et al. a été utilisée. L'affinement du grain améliore les résultats de simulation texture de façon significative et donne des informations complémentaires sur la distribution et la taille moyenne des grains, et la distribution de désorientation qui peut être directement comparés aux résultats expérimentaux
The new severe plastic deformation (SPD) technique, designated as high pressure tube twisting (HPTT), is a continuous process for grain refinement in bulk metallic materials with tubular geometry. It consists of placing a mandrel into the tube before applying an axial compression directly on the tube confined on both sides to produce high hydrostatic pressure. The tube is then twisted by an external torque with the help of the friction force genrated by the hydrostatic pressure. The ultra-fine grained structures produced with HPTT were confirmed using transmission electron microscopy and their microstructure and mechanical properties were evaluated. The value of yield stress is increased monotonically with the deformation imposed by HPTT. Meanwhile, the inverse deformation path is proved to be less advantageous. Microstructural evolution is studied by EBSD technique and texture measurements were carried out using X-ray. Deformed samples have simple shear texture with relatively low intensities and the effect of the initial texture on the final texture persists up to shear strain of nearly 6. Grain-to-grain misorientation distribution functions are bimodal and the second pick become higher with increasing strain. Industrial application of this new SPD technique requires advanced modelling in terms of texture evolution and grain fragmentation process. For this purpose, the new grain refinement model proposed by Toth and al. was used. Grain refinement improves the texture simulation results significantly and gives information on the average grain size, grain size distribution and misorientation distribution function that can be directly compared to experimental results

Nilsson, Tony. "Investigation of Limiters For HPM and UWB Front-door Protection". Thesis, Linköping University, Department of Electrical Engineering, 2006. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-7836.

Texto completo

Los estilos APA, Harvard, Vancouver, ISO, etc.

Resumen

An extensive investigation of front-door protection devices i.e. limiters has been made. The thesis work contains both HPM- and UWB-measurements done on various limiters, in order to characterize them. The measurements show that all limiters are not suitable as protection against HPM- and UWB-pulses. The limiters that were found to provide the best protection are limiters based on diode technologies. PIN- and Schottky-diodes generally shows very good performance and they fulfill many parameters that have been set by FOI. To obtain a full protection it is presumably necessary to use two or more limiters in combination, which complement each other.

En omfattande studie av framvägskopplingsskydd, dvs. limiters har gjorts. Examensarbetet innehåller resultat från både HPM- och UWB- mätningar som har gjorts på olika limitrar för att karaktärisera deras prestanda. Av resultaten från mätningarna kan man se att alla limitrar inte passar som skydd mot HPM- och UWB-pulser. De limitrar som tillhandahöll det bästa skyddet var baserade på olika diodtekniker. PIN- och Schottky-dioder visade sig överlag ha väldigt goda prestanda och de uppfyller många av de parametrar som bestämts av FOI. För att få ett heltäckande skydd är det förmodligen nödvändigt att man använder två eller flera limitrar i kombination, som kompletterar varandra.

Más fuentes

Libros sobre el tema "HPTM":

North Atlantic Treaty Organization. Advisory Group for Aerospace Research and Development. High power microwaves (HPM). Neuilly sur Seine, France: AGARD, 1995.

Buscar texto completo

Los estilos APA, Harvard, Vancouver, ISO, etc.

Cišper, Zlatko. HPT u Domovinskom ratu: 1991-1995. Zagreb: Hrvatske telekomunikacije, 1999.

Buscar texto completo

Los estilos APA, Harvard, Vancouver, ISO, etc.

U.S. Army Research Laboratory, ed. HPM, High Power Microwave Simulation Facility. [Adelphi, MD: Army Research Laboratory, 1995.

Buscar texto completo

Los estilos APA, Harvard, Vancouver, ISO, etc.

Hassan, M. Kabir, Muhammad Mostofa Hossain y Aishath Muneeza. Hire Purchase Under Shirkah al-Milk (HPSM) in Islamic Banking and Finance. Cham: Springer Nature Switzerland, 2023. http://dx.doi.org/10.1007/978-3-031-50105-0.

Texto completo

Los estilos APA, Harvard, Vancouver, ISO, etc.

Ahman. Pengembangan model bimbingan dan konseling komprehensif pada jalur pendidikan formal: Laporan penelitian hibah penelitian tim Pascasarjana-HPTP (tahun pertama). [Bandung]: Universitas Pendidikan Indonesia, 2012.

Buscar texto completo

Los estilos APA, Harvard, Vancouver, ISO, etc.

Nuryatin, Agus. Pengembangan model pembelajaran bahasa Indonesia berbasis pendidikan karakter pada pendidikan dasar: Hasil penelitian hibah penelitian tim pascasarjana-HPTP (hibah pasca). [Semarang]: Universitas Negeri Semarang, 2011.

Buscar texto completo

Los estilos APA, Harvard, Vancouver, ISO, etc.

Zulaeha, Ida. Model pengembangan pembelajaran bahasa Indonesia berbasis multikultural bagi pembentukan karakter siswa: Laporan hasil penelitian : hibah penelitian tim pascasarjana-HPTP (hibah pasca). [Semarang]: Universitas Negeri Semarang, 2011.

Buscar texto completo

Los estilos APA, Harvard, Vancouver, ISO, etc.

Suprijanto, Jusup. Kaji tindak pemanfaatan potensi hasil laut menuju pengelolaan sumberdaya berbasis "zero waste management": Laporan akhir hibah penelitian tim pascasarjana-HPTP, hibah pasca. Semarang: Universitas Diponegoro, 2010.

Buscar texto completo

Los estilos APA, Harvard, Vancouver, ISO, etc.

S, El-Genk Mohamed y United States. National Aeronautics and Space Administration., eds. "HPTAM", a two-dimensional heat pipe transient analysis model, including the startup from a frozen state: Final report no. UNM-ISNPS-4-1995. Albuquerque, N.M: Institute for Space and Nuclear Power Studies, School of Engineering, University of New Mexico, 1995.

Buscar texto completo

Los estilos APA, Harvard, Vancouver, ISO, etc.

Napitupulu, Efendi. Pengembangan model pembelajaran berbasis multimedia pada kompetensi kejuruan siswa SMK di Kota Medan: Laporan hasil penelitian tahun III hibah penelitian tim pascasarjana, HPTP, hibah pasca. Medan, Sumatera Utara: Universitas Negeri Medan, 2011.

Buscar texto completo

Los estilos APA, Harvard, Vancouver, ISO, etc.

Más fuentes

Capítulos de libros sobre el tema "HPTM":

Paul, Sanjoy. "Hierarchical PIM (HPIM)". En Multicasting on the Internet and its Applications, 111–18. Boston, MA: Springer US, 1998. http://dx.doi.org/10.1007/978-1-4615-5713-5_10.

Texto completo

Los estilos APA, Harvard, Vancouver, ISO, etc.

Sakr, Mahmoud F. "Hyperparathyroidism (HPT)". En Parathyroid Gland Disorders, 81–147. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-031-07418-9_7.

Texto completo

Los estilos APA, Harvard, Vancouver, ISO, etc.

Bartz-Beielstein, Thomas. "Hyperparameter Tuning and Optimization Applications". En Hyperparameter Tuning for Machine and Deep Learning with R, 165–75. Singapore: Springer Nature Singapore, 2023. http://dx.doi.org/10.1007/978-981-19-5170-1_6.

Texto completo

Los estilos APA, Harvard, Vancouver, ISO, etc.

Resumen

AbstractThis chapter reflects on advantages and sense of use of Hyperparameter Tuning (HPT) and its disadvantages. In particular it shows how important it is, to keep the human in the loop, even if HPT works perfectly. The chapter presents a collection of HPT studies. First, HPT applications in Machine Learning (ML) and Deep Learning (DL) are described. A special focus lies on automated ML, neural architecture search, and combined approaches. HPT software is presented. Finally, model based approaches, especially applications with Sequential Parameter Optimization Toolbox (SPOT) are discussed.

Hassan, M. Kabir, Muhammad Mostofa Hossain y Aishath Muneeza. "Operational Procedure of HPSM". En Hire Purchase Under Shirkah al-Milk (HPSM) in Islamic Banking and Finance, 109–28. Cham: Springer Nature Switzerland, 2023. http://dx.doi.org/10.1007/978-3-031-50105-0_5.

Texto completo

Los estilos APA, Harvard, Vancouver, ISO, etc.

Agarwal, Amit, Ranil Fernando, Rajeev Parameswaran, Anand Mishra y Roma Pradhan. "HPT-JT Syndrome". En Case Studies in Thyroid and Parathyroid Tumors, 165–68. Singapore: Springer Nature Singapore, 2023. http://dx.doi.org/10.1007/978-981-99-0938-4_37.

Texto completo

Los estilos APA, Harvard, Vancouver, ISO, etc.

Hassan, M. Kabir, Muhammad Mostofa Hossain y Aishath Muneeza. "Accounting Treatment in HPSM Contract". En Hire Purchase Under Shirkah al-Milk (HPSM) in Islamic Banking and Finance, 129–39. Cham: Springer Nature Switzerland, 2023. http://dx.doi.org/10.1007/978-3-031-50105-0_6.

Texto completo

Los estilos APA, Harvard, Vancouver, ISO, etc.

Bartz-Beielstein, Thomas, Sowmya Chandrasekaran y Frederik Rehbach. "Case Study II: Tuning of Gradient Boosting (xgboost)". En Hyperparameter Tuning for Machine and Deep Learning with R, 221–34. Singapore: Springer Nature Singapore, 2023. http://dx.doi.org/10.1007/978-981-19-5170-1_9.

Texto completo

Los estilos APA, Harvard, Vancouver, ISO, etc.

Resumen

AbstractThis case study gives a hands-on description of Hyperparameter Tuning (HPT) methods discussed in this book. The Extreme Gradient Boosting (XGBoost) method and its implementation was chosen, because it is one of the most powerful methods in many Machine Learning (ML) tasks, especially when standard tabular data should be analyzed. This case study follows the same HPT pipeline as the first and third studies: after the data set is provided and pre-processed, the experimental design is set up. Next, the HPT experiments are performed. The R package is used as a “datascope” to analyze the results from the HPT runs from several perspectives: in addition to Classification and Regression Trees (CART), the analysis combines results from the surface, sensitivity, and parallel plots with a classical regression analysis. Severity is used to discuss the practical relevance of the results from an error-statistical point-of-view. The well-proven R package is used as a uniform interface from the methods of the packages and to the ML methods. The corresponding source code is explained in a comprehensible manner.

Bartz-Beielstein, Thomas, Sowmya Chandrasekaran, Frederik Rehbach y Martin Zaefferer. "Case Study I: Tuning Random Forest (Ranger)". En Hyperparameter Tuning for Machine and Deep Learning with R, 187–220. Singapore: Springer Nature Singapore, 2023. http://dx.doi.org/10.1007/978-981-19-5170-1_8.

Texto completo

Los estilos APA, Harvard, Vancouver, ISO, etc.

Resumen

AbstractThis case study gives a hands-on description of Hyperparameter Tuning (HPT) methods discussed in this book. The Random Forest (RF) method and its implementation was chosen because it is the method of the first choice in many Machine Learning (ML) tasks. RF is easy to implement and robust. It can handle continuous as well as discrete input variables. This and the following two case studies follow the same HPT pipeline: after the data set is provided and pre-processed, the experimental design is set up. Next, the HPT experiments are performed. The R package is used as a “datascope” to analyze the results from the HPT runs from several perspectives: in addition to Classification and Regression Trees (CART), the analysis combines results from surface, sensitivity and parallel plots with a classical regression analysis. Severity is used to discuss the practical relevance of the results from an error-statistical point-of-view. The well proven R package is used as a uniform interface from the methods of the packages and to the ML methods. The corresponding source code is explained in a comprehensible manner.

Al-Adsani, Ahmad S. y Omid Beik. "Multiphase HPM Generator Systems". En Multiphase Hybrid Electric Machines, 95–142. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-80435-0_4.

Texto completo

Los estilos APA, Harvard, Vancouver, ISO, etc.

Brett, Bevin. "HPTC - What Really Restrains Our Progress". En High Performance Computing Systems and Applications, 11–18. Boston, MA: Springer US, 2003. http://dx.doi.org/10.1007/978-1-4615-0288-3_5.

Texto completo

Los estilos APA, Harvard, Vancouver, ISO, etc.

Actas de conferencias sobre el tema "HPTM":

Singh, Prince y Pranav Sharma. "Analytical solution of Fisher’s equation using accelerated HPTM". En DIDACTIC TRANSFER OF PHYSICS KNOWLEDGE THROUGH DISTANCE EDUCATION: DIDFYZ 2021. AIP Publishing, 2022. http://dx.doi.org/10.1063/5.0080556.

Texto completo

Los estilos APA, Harvard, Vancouver, ISO, etc.

Li, Shuangyin, Haoyu Luo y Gansen Zhao. "bi-HPTM: An Effective Semantic Matchmaking Model for Web Service Discovery". En 2020 IEEE International Conference on Web Services (ICWS). IEEE, 2020. http://dx.doi.org/10.1109/icws49710.2020.00064.

Texto completo

Los estilos APA, Harvard, Vancouver, ISO, etc.

McNichols, Ezra O., Scott M. Jones, Arman Mirhashemi, Paht Juangphanich y Vikram Shyam. "Preliminary Study of Heat Pipe Turbine Vane Cooling in the NASA N+3 Reference Engine". En ASME Turbo Expo 2021: Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2021. http://dx.doi.org/10.1115/gt2021-59352.

Texto completo

Los estilos APA, Harvard, Vancouver, ISO, etc.

Resumen

Abstract This paper investigates the effects of implementing Heat Pipe Turbine Vane (HPTV) cooling in the NASA N+3 engine. The HPTV can be thought of as a heat pipe in the shape of a turbine vane, functioning as both an aerodynamic body and heat exchanger. The heat-absorbing section of the HPTV remains fixed in the vanes of the high-pressure turbine (HPT), while the heat-rejecting section can be placed in any stage of the low pressure turbine (LPT) as well as the bypass stream. The optimal location of the condensing (heat-rejecting) section is shown to be in the bypass stream for both HPT stages. The thrust-specific fuel consumption (TSFC) increased by 0.2%, which is mainly attributed to the elimination of air cooling in the second stage HPT vanes combined with the transfer of energy from the main gas path to elsewhere in the cycle. Air cooling is also eliminated in the first stage HPT vanes, but this cooling air is nonchargeable. A preliminary design is proposed and shown to demonstrate the desired performance and operates below the heat flux limitations of the heat pipe.

Kotsifakou, Maria, Prakalp Srivastava, Matthew D. Sinclair, Rakesh Komuravelli, Vikram Adve y Sarita Adve. "HPVM". En PPoPP '18: 23nd ACM SIGPLAN Symposium on Principles and Practice of Parallel Programming. New York, NY, USA: ACM, 2018. http://dx.doi.org/10.1145/3178487.3178493.

Texto completo

Los estilos APA, Harvard, Vancouver, ISO, etc.

Donikian, Stéphane. "HPTS". En the fifth international conference. New York, New York, USA: ACM Press, 2001. http://dx.doi.org/10.1145/375735.376382.

Texto completo

Los estilos APA, Harvard, Vancouver, ISO, etc.

Ghisoni, Marco, Ola Sjölund, Anders Larsson y Shumin M. Wang. "Strain effects on heterojunction phototransistor performance". En The European Conference on Lasers and Electro-Optics. Washington, D.C.: Optica Publishing Group, 1996. http://dx.doi.org/10.1364/cleo_europe.1996.cthk2.

Texto completo

Los estilos APA, Harvard, Vancouver, ISO, etc.

Resumen

The hetcrojunction phototransistor (HPT), with its inherent gain, is an attractive component for future optical interconnection systems [1]. The use of InGaAs as the absorbing medium is driven by the desire to operate at GaAs substrate transparent wavelengths. However, a trade-off exists between an increase in the thickness of absorbing material, and the onset of lattice relaxation giving rise to defects which degrade the devices. In this work we compare three HPTs, using 12, 20 and 30 strained InGaAs quantum wells (QWs), respectively, as the absorber. We show that all have high performance, but that lattice relaxation does cause a degradation in the device characteristics. The HPTs are of an n-p-i-n configuration grown on n-type GaAs substrate, similar to those previously reported [2]. The 1µm intrinsic collector region consists of GaAs within which are buried the different sets of InGaAs QWs.

Bryan, R. P., G. R. Olbright, T. M. Brennan, W. S. Fu y J. Y. Tsao. "High-gain InGaAs heterojunction phototransistor operating at 930 nm using resonant periodic absorption for surface-emitting laser logic devices". En OSA Annual Meeting. Washington, D.C.: Optica Publishing Group, 1991. http://dx.doi.org/10.1364/oam.1991.thh3.

Texto completo

Los estilos APA, Harvard, Vancouver, ISO, etc.

Resumen

Using a new technique called resonant periodic absorption, we have achieved high-optical gain in InGaAs/GaAs heterojunction phototransistors (HPTs) for wavelengths at which GaAs substrates are transparent(>925 nm). These devices are promising for optoelectronic interconnect, optical-logic device, neural network, and lightwave communication uses. Specifically, these InGaAs HPTs are ideally suited for integration with InGaAs vertical cavity surface-emitting laser (VCSEL) diodes to produce monolithic surface-emitting laser logic (CELL) devices.1 Resonant periodic absorption is achieved in an asymmetric microresonator consisting of a strained layer InGaAs/GaAs HPT sandwiched between distributed Bragg reflectors. By aligning the optical intensity maxima with the InGaAs quantum wells in the collector region of the phototransistor, we are able to achieve high gain(>600 at a 4.0-V bias and a 50-mA collector current) at wavelengths >900 nm from a structure in which the absorption coefficient, aL, is only ~0.1. We describe the design, growth, and fabrication of a monolithic CELL consisting of an InGaAs/GaAs HPT and VCSEL operating at 930 nm. CELL devices are cascadable optical logic devices (smart pixels) in which incident light generates photocurrent in the phototransistor that is internally amplified and then used to drive the VCSEL above threshold. These devices will operate at a wavelength that is in the passband of the GaAs substrate and therefore avoid the problems associated with the removal of the substrate in AlGaAs/GaAs CELL structures operating in transmission.

Katz, Y. "Small volume mechanical response insights: revealed contributions in advancing high mechanical performance". En HPSM 2008. Southampton, UK: WIT Press, 2008. http://dx.doi.org/10.2495/hpsm080011.

Texto completo

Los estilos APA, Harvard, Vancouver, ISO, etc.

Singh, H. y D. K. Paul. "Inelastic dynamic response of 3D reinforced concrete infilled frames". En HPSM 2008. Southampton, UK: WIT Press, 2008. http://dx.doi.org/10.2495/hpsm080391.

Texto completo

Los estilos APA, Harvard, Vancouver, ISO, etc.

Klasztorny, M., T. Niezgoda y R. Gieleta. "Viscoelastic modelling of regular cross-ply polymer-matrix laminates". En HPSM 2008. Southampton, UK: WIT Press, 2008. http://dx.doi.org/10.2495/hpsm080021.

Texto completo

Los estilos APA, Harvard, Vancouver, ISO, etc.

Informes sobre el tema "HPTM":

Cohen, Shabtai, Melvin Tyree, Amos Naor, Alan N. Lakso, Terence L. Robinson y Yehezkiel Cohen. Influence of hydraulic properties of rootstocks and the rootstock-scion graft on water use and productivity of apple trees. United States Department of Agriculture, 2001. http://dx.doi.org/10.32747/2001.7587219.bard.

Texto completo

Los estilos APA, Harvard, Vancouver, ISO, etc.

Resumen

This one year exploratory project investigated hydraulic architecture of apple dwarfing rootstocks. The hypothesis was that hydraulic conductance is correlated with rootstock vigor. A previous study of trees on three rootstocks in Israel showed that dwarfed trees used less water than un-dwarfed trees. Analysis showed that if the tree maintains leaf water potentials above minimum values, then this implies that the dwarfed trees have lower leaf conductance, which may also be the cause of dwarfing. The current project studied small 2-year old unworked rootstock trees, and full sized trees bearing commercial yields. In both cases hydraulic conductance was determined with two methods - the non-destructive evaporative flux (EF)-leaf water potential (L WP) method, and a destructive method in which water was forced through the plant at known pressure using the "high pressure flow meter" (HPFM). Detailed work allowed measurement of conductance of the rootstock-scion union. This was achieved both with the HPFM and with the EF-LWP methods, the former in the US and the latter in Israel. Direct measurements of leaf conductance were made, and carbon isotope ratios ( d ¹³ C) were determined for leaves sampled at the end of the season. The latter can indicate sustained differences in leaf conductance behavior. HPFM and EF-LWP methods did not give the same results. In the small plants results were similar in magnitude, but not significantly correlated. In large trees, EF- L WP measurements were a fraction of those obtained with the HPFM. The latter indicates that some of the xylem is not normally functional but transports water when pressurized. Additional experimental work targeted this result. Xylem was stained before and after perfusion with water at high pressure. This showed that at least for one rootstock a significant amount of xylem was blocked before perfusion. The "air method" for determining xylem vessel properties was improved and employed. Length, radius and density of xylem vessels of different rootstocks were found to be similar, and significant differences found were not clearly related to rootstock vigor. Measurements in the commercial orchard in Israel showed that the graft union in a dwarfing rootstock was a large obstacle for water transport (i.e. had a high resistance). This apparently led to low leaf conductance to water vapor, as indicated by lower d ¹³ C, which implies low internal CO ₂ concentrations. In the US orchard, d ¹³ C in 2001 was correlated with rootstock vigor, and significant differences were found in leaf conductance. However, the d ¹³ C differences were not observed in 2002, were opposite to those found in the Israeli orchard, and measurements of the graft union with the HPFM did not find large resistances. We speculate that the graft union is not necessarily a large impediment to water transport unless the scion starts to separate from the rootstock. It was concluded that significant differences in hydraulic conductance exist between different dwarfing rootstocks. These differences may be caused by differences in xylem properties and in the degree of cavitation, as well as resistance in the graft union. However, no general relationship to rootstock vigor was found. Therefore, hydraulic conductance alone cannot explain dwarfing, but may be one of two or more factors that lead to dwarfing. Future work should integrate more factors with hydraulic relations, e.g. nutrient and solute transport and production of hormones.

Shen, Bo y Jeffrey D. Munk. Cost-Optimized CCHP Model Developed Using HPDM Meeting Performance Targets. Office of Scientific and Technical Information (OSTI), agosto de 2019. http://dx.doi.org/10.2172/1557522.

Texto completo

Los estilos APA, Harvard, Vancouver, ISO, etc.

Koslover, Robert A. Breakthroughs In Low-Profile Leaky-Wave HPM Antennas. Fort Belvoir, VA: Defense Technical Information Center, septiembre de 2014. http://dx.doi.org/10.21236/ada610231.

Texto completo

Los estilos APA, Harvard, Vancouver, ISO, etc.

Koslover, Robert A. Breakthroughs In Low-Profile Leaky-Wave HPM Antennas. Fort Belvoir, VA: Defense Technical Information Center, junio de 2014. http://dx.doi.org/10.21236/ada613777.

Texto completo

Los estilos APA, Harvard, Vancouver, ISO, etc.

Antonsen, Jr, Ott Thomas M., Rodgers Edward, Anlage John y Steven M. Wave Chaos and HPM Effects on Electronic Systems. Fort Belvoir, VA: Defense Technical Information Center, octubre de 2010. http://dx.doi.org/10.21236/ada564377.

Texto completo

Los estilos APA, Harvard, Vancouver, ISO, etc.

Koslover, Robert A. Breakthroughs in Low-Profile Leaky-Wave HPM Antennas. Fort Belvoir, VA: Defense Technical Information Center, marzo de 2015. http://dx.doi.org/10.21236/ada614927.

Texto completo

Los estilos APA, Harvard, Vancouver, ISO, etc.

Koslover, Robert A. Breakthroughs In Low-profile Leaky-Wave HPM Antennas. Fort Belvoir, VA: Defense Technical Information Center, junio de 2015. http://dx.doi.org/10.21236/ada619768.

Texto completo

Los estilos APA, Harvard, Vancouver, ISO, etc.

Koslover, Robert A. Breakthroughs in Low-Profile Leaky-Wave HPM Antennas. Fort Belvoir, VA: Defense Technical Information Center, diciembre de 2014. http://dx.doi.org/10.21236/ada621573.

Texto completo

Los estilos APA, Harvard, Vancouver, ISO, etc.

Koslover, Robert A. Breakthroughs In Low-profile Leaky-Wave HPM Antennas. Fort Belvoir, VA: Defense Technical Information Center, septiembre de 2015. http://dx.doi.org/10.21236/ada624903.

Texto completo

Los estilos APA, Harvard, Vancouver, ISO, etc.

Shen, Bo. Extending ORNL HPDM Capabilities for Design and Optimization of New Refrigerant Blends – FY18 2nd Quarter Milestone Report: Improve HPDM to Adopt New Refrigerant Properties and Correlations. Office of Scientific and Technical Information (OSTI), septiembre de 2018. http://dx.doi.org/10.2172/1471866.

Texto completo

Los estilos APA, Harvard, Vancouver, ISO, etc.