Artículos de revistas: "Dynamic of transfert"

1

Nadan, Amos. "Colonial Misunderstanding of an Efficient Peasant Institution: Land Settlement and Mushā Tenure in Mandate Palestine, 1921-47". Journal of the Economic and Social History of the Orient 46, n.º 3 (2003): 320–54. http://dx.doi.org/10.1163/156852003322316661.

Texto completo

Resumen

AbstractThe accepted wisdom is that the mushā in Palestine was an archaic system that blocked any chance of development, since no one had any inducement to improve his land. But this study of the mushā, as part of a set of institutions, contradicts that wisdom. The mushā in Palestine was an efficient, dynamic economic institution that facilitated investment. There was no need for land reform, which only proved destructive to the economy of the fallāhīn. It nullified the advantages inherent in the system and, unexpectedly, facilitated the transfer of lands from Arabs to Jews. La vision généralement admise est que le mushā en Palestine était un système archaïque qui faisait obstacle à toute perspective de développement, puisque personne n'était incité à améliorer sa terre. Mais notre étude du mushā contredit cette vision. Le mushā en Palestine était une institution économique efficace et dynamique qui facilitait l'investissement. La réforme foncière qui abolit le mushā a été destructrice pour l'économie des fallāhīn. La réforme a annulé les avantages inhérents au système et, de façon inattendue, a facilité le transfert de terres des Arabes aux Juifs.

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

2

Madzharov, Nikolay D., Raycho T. Ilarionov y Anton T. Tonchev. "System for Dynamic Inductive Power Transfer". Indian Journal of Applied Research 4, n.º 7 (1 de octubre de 2011): 173–76. http://dx.doi.org/10.15373/2249555x/july2014/52.

Texto completo

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

3

Pfund, Jean-Laurent, Pierre Kistler y Stefano Guidese. "Gestion de la forêt tropicale en zone rurale: le transfert de technologies peut-il être le catalyseur de partenariats durables? | Management of tropical forests in rural areas: Can technology transfer really act as a catalyst for sustainable partnerships?" Schweizerische Zeitschrift fur Forstwesen 155, n.º 3-4 (1 de marzo de 2004): 97–105. http://dx.doi.org/10.3188/szf.2004.0097.

Texto completo

Resumen

This article discusses the necessary adaptation of improvement techniques to local rural requirements, based on two case studies on (i) a forest with high timber potential and (ii) a forest with high agricultural pressure. Results underline the importance of the exchange of information and communication networks as essential components of a dynamic development. In spite of fundamentally different forest management schemes, a number of analytical elements seem common in both cases studied (Congo Basin and Madagascar). According to these examples, one can see that the disabling factors arise,on the one hand, from classical problems of maladjustment to local conditions, and from deficiencies in the «tools» of information transmission and sustainability gaps, due to lack of support from the local population, on the other. Moreover, it is clear that a strategy needs to be adopted that grants the local system as much autonomy as possible. The strategy must satisfy the basic needs of the local population and also take the growing need for cash into account. The article concludes that the transfer of technologies can indeed quickly become a catalyst of sustainable partnerships in favorable conditions of local development, provided that the local beneficiaries of the transfer are identified in an equitable manner. At the same time, preceding and normally complementary measures are necessary to improve local competences and organization. The setting up of lasting relations with partners and their organisations is the key to reaching a consensus on the definition of objectives, as well as to regular relations that allow for adjustments to the system should complications arise. Responsibility for the sustainability of the system remains with the State, which co-ordinates activities as a whole, while dynamic impulses come more from the economic sector. In addition to setting up long-term partnerships the central concerns of the system include local know-how, the capabilities of assimilation and negotiation between the principal local actors and sound financial analysis.

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

4

Ahn, T. Y., K. F. Eman y S. M. Wu. "Cutting Dynamics Identification by Dynamic Data System (DDS) Modeling Approach". Journal of Engineering for Industry 107, n.º 2 (1 de mayo de 1985): 91–94. http://dx.doi.org/10.1115/1.3185988.

Texto completo

Resumen

The dynamics of the cutting process have been conventionally characterized in terms of the Dynamic Cutting Force Coefficients (DCFC) which represent its transfer characteristics at discrete frequencies. However, this approach fails to obtain the transfer function of the process in closed analytical form. Anticipating the stochastic nature of the cutting process and the double modulation principle, a two-input one-output multivariate system was postulated for the dynamic cutting process identification model. The Dynamic Data System (DDS) methodology was used to formulate and characterize the dynamic cutting process using Modified Autoregressive Moving Average Vector (MARMAV) models. Subsequently, transfer functions of the inner and outer modulation dynamics of the cutting processes were obtained from the identified models.

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

5

Gichan, O. I. "Dynamic instabilities on a charged boundary: influence of mass transfer". Reports of the National Academy of Sciences of Ukraine, n.º 10 (16 de noviembre de 2016): 47–53. http://dx.doi.org/10.15407/dopovidi2016.10.047.

Texto completo

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

6

Kubsch, Marcus y Paul C. Hamerski. "Dynamic Energy Transfer Models". Physics Teacher 60, n.º 7 (octubre de 2022): 583–85. http://dx.doi.org/10.1119/5.0037727.

Texto completo

Resumen

Energy is a disciplinary core idea and a cross-cutting concept in the K-12 Framework for Science Education and the Next Generation Science Standards (NGSS). As numerous authors point out, the energy model in these standards emphasizes the connections between energy and systems. Using energy ideas to interpret or make sense of phenomena means tracking transfers of energy across systems (including objects and fields) as phenomena unfold. To support students in progressing towards this goal, numerous representations—both static and dynamic—that describe the flow of energy across systems exist. Static representations work well to describe phenomena where the flow of energy is unidirectional and the dynamics are not a focus but struggle to represent circular energy flows and the temporal order of complex, dynamic phenomena. Existing dynamic representations like Energy Theater are usually qualitative, i.e., they represent energy in ways that differentiate between larger or smaller rates of transfer but do not provide a more detailed quantitative picture. In this article, we present how an existing, empirically tested, static representation called Energy Transfer Model (ETM) can be turned into a dynamic representation that is quantitatively accurate using the freely available 3D animation programming environment GlowScript ( https://www.glowscript.org ). To do so, we first summarize the central ideas in a model of energy that emphasizes the idea of energy transfer between systems, and we describe how the ETM represents those ideas. Then, we introduce the dynamic ETM and explain how it goes beyond the limitations of its static counterpart and how its quantitative accuracy adds to existing dynamic representations. Lastly, we discuss how the dynamic ETM can be used to integrate computational thinking into the physics classroom.

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

7

AKHAVAN, R., A. ANSARI, S. KANG y N. MANGIAVACCHI. "Subgrid-scale interactions in a numerically simulated planar turbulent jet and implications for modelling". Journal of Fluid Mechanics 408 (10 de abril de 2000): 83–120. http://dx.doi.org/10.1017/s0022112099007582.

Texto completo

Resumen

The dynamics of subgrid-scale energy transfer in turbulence is investigated in a database of a planar turbulent jet at Reλ ≈ 110, obtained by direct numerical simulation. In agreement with analytical predictions (Kraichnan 1976), subgrid-scale energy transfer is found to arise from two effects: one involving non-local interactions between the resolved scales and disparate subgrid scales, the other involving local interactions between the resolved and subgrid scales near the cutoff. The former gives rise to a positive, wavenumber-independent eddy-viscosity distribution in the spectral space, and is manifested as low-intensity, forward transfers of energy in the physical space. The latter gives rise to positive and negative cusps in the spectral eddy-viscosity distribution near the cutoff, and appears as intense and coherent regions of forward and reverse transfer of energy in the physical space. Only a narrow band of subgrid wavenumbers, on the order of a fraction of an octave, make the dominant contributions to the latter. A dynamic two-component subgrid-scale model (DTM), incorporating these effects, is proposed. In this model, the non-local forward transfers of energy are parameterized using an eddy-viscosity term, while the local interactions are modelled using the dynamics of the resolved scales near the cutoff. The model naturally accounts for backscatter and correctly predicts the breakdown of the net transfer into forward and reverse contributions in a priori tests. The inclusion of the local-interactions term in DTM significantly reduces the variability of the model coefficient compared to that in pure eddy-viscosity models. This eliminates the need for averaging the model coefficient, making DTM well-suited to computations of complex-geometry flows. The proposed model is evaluated in LES of transitional and turbulent jet and channel flows. The results show DTM provides more accurate predictions of the statistics, structure, and spectra than dynamic eddy-viscosity models and remains robust at marginal LES resolutions.

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

8

SAMIR FEKRY, Christina. "Transfert stylistique des registres langagiers dans la traduction audiovisuelle vers le français des deux films égyptiens Femmes du Caire et Les Femmes du Bus 678". Traduction et Langues 20, n.º 1 (31 de agosto de 2021): 58–85. http://dx.doi.org/10.52919/translang.v20i1.848.

Texto completo

Resumen

Stylistic Transfer of Language Registers in the Audiovisual Translation into French of the Two Egyptian Films Femmes du Caire and Les Femmes du Bus 678 Pre-recorded interlinguistic subtitles are texts added in the lower part of the image to translate simultaneously the scene seen and heard. Subtitling is a delicate operation in which one must find the balance between the oral context presented on the screen and the written translation that scrolls at a pace that the viewer cannot control. During the stylistic transfer of the film dialogue, subtitles are perceived not as syntaxico-semantic units read in isolation, but as an inseparable component of the audiovisual multimodal text. The present study aims to provide answers to the following questions: what TAV strategies did the subtitler adopt to translate the dramatic cinematographic narration of the two films studied? And how does this affect the interpretation of a particular sequence by the second recipient, namely the French- speaking audience? What impact could a translational choice have on audiovisual adaptation in the target language-culture? We identified in “Femmes du Caire” and “Les Femmes du Bus 678”, two language registers, namely the common speech and the colloquial register whose use we examined in different scenes considering the linguistic classification of the language levels in French and in Arabic, and taking into account the cultural and the situational frameworks, the context of production and reception and the relationship between the interlocutors. Considering the spatio-temporal constraints of this mode of AVT requiring from the translator-adapter a hierarchy of the information contained in the speech in the light of a possible condensation, reformulation, economy, even omission, if necessary, we also based our analysis on the theory of meaning and the theory of dynamic equivalence essential for the interpretation of the source language and the production of an intelligible target subtitles stylistically appropriate to the language level used.

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

9

Chen, Tian Li, Jing Zeng, Yao Hui Lu y Li Min Zhang. "Vibration Transfer Analysis of High Speed Train Considering Car body Flexibility". Advanced Materials Research 605-607 (diciembre de 2012): 1168–71. http://dx.doi.org/10.4028/www.scientific.net/amr.605-607.1168.

Texto completo

Resumen

In order to research the influence of the flexible car body on the vehicle system dynamic performance and to achieve the reasonable match between high speed and lightweight，it is necessary to build vehicle system dynamic model with the rigid car body replaced by the flexible car body. Due to the lower structure natural vibration frequency of car body, the influence of carbody flexibility on vehicle system dynamic performance is more influential. The influences of structural vibration of car body on vehicle system dynamics performance were studied by finite element analysis (FEA) method and multi-body system (MBS) dynamics theory. Rigid-flexible coupled vehicle system dynamic models were built up and the car body key location’s vibration was analyzed through vibration transmission chain. The results show that the influences of high speed carbody structure vibration on vehicle system dynamics performance are distinguished especially in the domain of car body natural vibration frequency.

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

10

Mygal, V. P. "Influence of radiation heat transfer dynamics on crystal growth". Functional materials 25, n.º 3 (27 de septiembre de 2018): 574–80. http://dx.doi.org/10.15407/fm25.03.574.

Texto completo

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

11

Ye Yan, 叶燕, 马亚骐 Ma Yaqi, 宋志 Song Zhi, 路畅 Lu Chang, 许宜申 Xu Yishen y 陈林森 Chen Linsen. "基于傅里叶变换光学系统的动态多光束干涉光刻". Acta Optica Sinica 43, n.º 8 (2023): 0822015. http://dx.doi.org/10.3788/aos221892.

Texto completo

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

12

Ferriere, Axelle, Philipp Grübener, Gaston Navarro y Oliko Vardishvili. "On the optimal design of transfers and income-tax progressivity". International Finance Discussion Paper, n.º 1350 (agosto de 2022): 1–52. http://dx.doi.org/10.17016/ifdp.2022.1350.

Texto completo

Resumen

We study the optimal design of means-tested transfers and progressive income taxes. In a simple analytical model, we demonstrate an optimally negative relation between transfers and income-tax progressivity due to efficiency and redistribution concerns. In a rich dynamic model, we quantify the optimal plan with flexible tax-and-transfer functions. Transfers should be larger than currently in the U.S. and financed with moderate income-tax progressivity. Transfers are key to implement higher progressivity in average than in marginal tax-and-transfer rates, achieving redistribution while preserving efficiency. Quantitatively, the left tail of the income distribution determines optimal transfers, whereas the right tail determines income-tax progressivity.

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

13

Benkert, Jean-Michel y Igor Letina. "Designing Dynamic Research Contests". American Economic Journal: Microeconomics 12, n.º 4 (1 de noviembre de 2020): 270–89. http://dx.doi.org/10.1257/mic.20180263.

Texto completo

Resumen

This paper studies the optimal design of dynamic research contests. We introduce interim transfers, which are paid in every period while the contest is ongoing, to an otherwise standard setting. We show that a contest where (i) the principal can stop the contest in any period, (ii) a constant interim transfer is paid to agents in each period while the contest is ongoing, and (iii) a final prize is paid once the principal stops the contest, is optimal for the principal and implements the first-best. (JEL D82, O32)

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

14

Yang Ran, 杨燃, 朱新港 Zhu Xingang, 杨涛 Yang Tao, 周致富 Zhou Zhifu y 陈斌 Chen Bin. "R404A脉冲喷雾冷却类皮肤表面动态传热规律研究". Chinese Journal of Lasers 49, n.º 5 (2022): 0507105. http://dx.doi.org/10.3788/cjl202249.0507105.

Texto completo

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

15

Balaji, G. Naveen, S. Chenthur Pandian y S. Giridharan S. Shobana J. Gayathri. "Dynamic and Non-Linear Charge Transfer through Opto-Deportation by Photovoltaic Cell". International Journal of Trend in Scientific Research and Development Volume-1, Issue-5 (31 de agosto de 2017): 486–92. http://dx.doi.org/10.31142/ijtsrd2329.

Texto completo

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

16

Tachibana, Akitomo, Yoshihiro Asai, Masaru Kohno, Kenzi Hori y Tokio Yamabe. "Morphology of dynamic electron transfer characteristic of chemical reaction dynamics". Journal of Chemical Physics 83, n.º 12 (15 de diciembre de 1985): 6334–43. http://dx.doi.org/10.1063/1.449860.

Texto completo

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

17

Wang, Jinsung y Robert L. Sainburg. "Interlimb Transfer of Novel Inertial Dynamics Is Asymmetrical". Journal of Neurophysiology 92, n.º 1 (julio de 2004): 349–60. http://dx.doi.org/10.1152/jn.00960.2003.

Texto completo

Resumen

Mechanisms underlying interlimb transfer of adaptation to visuomotor rotations have recently been explored in depth. However, little data are available regarding interlimb transfer of adaptation to novel inertial dynamics. The present study thus investigated interlimb transfer of dynamics by examining the effect of initial training with one arm on subsequent performance with the other in adaptation to a 1.5-kg mass attached eccentrically to the forearm. Using inverse dynamic analysis, we examined the changes in torque strategies associated with adaptation to the extra mass, and with interlimb transfer of that adaptation. Following initial training with the dominant arm, nondominant arm performance improved substantially in terms of linearity and initial direction control as compared with naïve performance. However, initial training with the nondominant arm had no effect on subsequent performance with the dominant arm. Inverse dynamic analysis revealed that improvements in kinematics were implemented by increasing flexor muscle torques at the elbow to counter load-induced increases in extensor interaction torques as well as increasing flexor muscle torques at the shoulder to counter the extensor actions of elbow muscle torque. Following opposite arm adaptation, the nondominant arm adopted this dynamic strategy early in adaptation. These findings suggest that dominant arm adaptation to novel inertial dynamics leads to information that can be accessed and utilized by the opposite arm controller, but not vice versa. When compared with our previous findings on interlimb transfer of visuomotor rotations, our current findings suggest that adaptations to visuomotor and dynamic transformations are mediated by distinct neural mechanisms.

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

18

Vázquez, J. A. y L. E. Barrett. "Modeling of Tilting-Pad Journal Bearings with Transfer Functions". International Journal of Rotating Machinery 7, n.º 1 (2001): 1–10. http://dx.doi.org/10.1155/s1023621x0100001x.

Texto completo

Resumen

Tilting-pad journal bearings are widely used to promote stability in modern rotating machinery. However, the dynamics associated with pad motion alters this stabilizing capacity depending on the operating speed of the machine and the bearing geometric parameters, particularly the bearing preload. In modeling the dynamics of the entire rotor-bearing system, the rotor is augmented with a model of the bearings. This model may explicitly include the pad degrees of freedom or may implicitly include them by using dynamic matrix reduction methods. The dynamic reduction models may be represented as a set of polynomials in the eigenvalues of the system used to determine stability. All tilting-pad bearings can then be represented by a fixed size matrix with polynomial elements interacting with the rotor. This paper presents a procedure to calculate the coefficients of polynomials for implicit bearing models. The order of the polynomials changes to reflect the number of pads in the bearings. This results in a very compact and computationally efficient method for fully including the dynamics of tilting-pad bearings or other multiple degrees of freedom components that interact with rotors. The fixed size of the dynamic reduction matrices permits the method to be easily incorporated into rotor dynamic stability codes. A recursive algorithm is developed and presented for calculating the coefficients of the polynomials. The method is applied to stability calculations for a model of a typical industrial compressor.

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

19

Ockenden, Mary C., Wlodek Tych, Keith J. Beven, Adrian L. Collins, Robert Evans, Peter D. Falloon, Kirsty J. Forber et al. "Prediction of storm transfers and annual loads with data-based mechanistic models using high-frequency data". Hydrology and Earth System Sciences 21, n.º 12 (18 de diciembre de 2017): 6425–44. http://dx.doi.org/10.5194/hess-21-6425-2017.

Texto completo

Resumen

Abstract. Excess nutrients in surface waters, such as phosphorus (P) from agriculture, result in poor water quality, with adverse effects on ecological health and costs for remediation. However, understanding and prediction of P transfers in catchments have been limited by inadequate data and over-parameterised models with high uncertainty. We show that, with high temporal resolution data, we are able to identify simple dynamic models that capture the P load dynamics in three contrasting agricultural catchments in the UK. For a flashy catchment, a linear, second-order (two pathways) model for discharge gave high simulation efficiencies for short-term storm sequences and was useful in highlighting uncertainties in out-of-bank flows. A model with non-linear rainfall input was appropriate for predicting seasonal or annual cumulative P loads where antecedent conditions affected the catchment response. For second-order models, the time constant for the fast pathway varied between 2 and 15 h for all three catchments and for both discharge and P, confirming that high temporal resolution data are necessary to capture the dynamic responses in small catchments (10–50 km2). The models led to a better understanding of the dominant nutrient transfer modes, which will be helpful in determining phosphorus transfers following changes in precipitation patterns in the future.

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

20

Edwige, Stephie, Yoann Eulalie, Philippe Gilotte y Iraj Mortazavi. "Wake flow analysis and control on a 47° slant angle Ahmed body". International Journal of Numerical Methods for Heat & Fluid Flow 28, n.º 5 (8 de mayo de 2018): 1061–79. http://dx.doi.org/10.1108/hff-06-2017-0260.

Texto completo

Resumen

Purpose The purpose of this paper is to present numerical investigations of the flow dynamic characteristics of a 47° Ahmed Body to identify wake flow control strategy leading to drag coefficient reduction, which could be tested later on sport utility vehicles. Design/methodology/approach This study begins with a mean flow topology description owing to dynamic and spectral analysis of the aerodynamic tensor. Then, the sparse promoting dynamic modal decomposition method is discussed and compared to other modal approaches. This method is then applied on the wall and wake pressure to determine frequencies of the highest energy pressure modes and their transfers to other frequency modes. This analysis is then used to design appropriated feedback flow control strategies. Findings This dynamic modal decomposition highlights a reduced number of modes at low frequency which drive the flow dynamics. The authors especially notice that the pressure mode at a Strouhal number of 0.22, based on the width between feet, induces aerodynamic losses close to the rear end. Strategy of the proposed control loop enables to dampen the energy of this mode, but it has been transferred to lower frequency mode outside of the selected region of interest. Originality/value This analysis and methodology of feedback control shows potential drag reduction with appropriated modal energy transfer management.

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

21

Ma Yinhang, 马银行, 徐燕 Xu Yan, 吴敏杨 Wu Minyang, 程昊 Cheng Hao y 杨福俊 Yang Fujun. "水转印栅线聚氨酯大变形及动态力学特性测量". Acta Optica Sinica 42, n.º 1 (2022): 0105001. http://dx.doi.org/10.3788/aos202242.0105001.

Texto completo

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

22

Ochoa, José, Irene Lovriha, Guadalupe Huelsz y Guillermo Barrios. "Transferencia dinámica de calor en muros de block hueco en una vivienda con ventilación natural". Vivienda y Comunidades Sustentables, n.º 14 (31 de julio de 2023): 109–22. http://dx.doi.org/10.32870/rvcs.v0i14.241.

Texto completo

Resumen

Este estudio presenta una investigación experimental sobre la transferencia dinámica de calor a través de un muro exterior de bloques huecos de concreto en una vivienda sin aire acondicionado en un clima cálido-seco. El estudio busca determinar si la parte sólida del bloque hueco, que se considera un puente térmico en este tipo de sistema constructivo, es o no el camino principal para la transferencia de calor en condiciones climáticas cálidas y secas. Los resultados muestran que la proporción entre el calor transferido por la trayectoria de la cavidad y el correspondiente a la trayctoria sólida varía a lo largo del día. Durante la noche, por la trayectoria dentro de la cavidad se transfiere casi el mismo calor que por la trayectoria de la parte sólida, y durante el di?a, por la trayectoria dentro de la cavidad se transfiere menos calor que por la trayectoria de la parte sólida, mientras que por lapsos cortos esta última proporción se invierte. Por lo tanto, se concluye que el camino sólido de un bloque hueco no puede considerarse automáticamente un puente térmico, ni el camino en la cavidad como la parte de baja transferencia de calor, debido a que esta proporción varía a lo largo del día. Este trabajo proporciona un análisis dinámico de la transferencia de calor a través de un material ampliamente utilizado en viviendas de bajos ingresos en México para una mejor comprensión del fenómeno.

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

23

Zhang Weiguang, 张维光, 于洵 Yu Xun, 韩峰 Han Feng, 张发强 Zhang Faqiang, 吴银花 Wu Yinhua y 陈玉娇 Chen Yujiao. "室内模拟环境下动态调制传递函数检测方法". Infrared and Laser Engineering 51, n.º 7 (2022): 20210756. http://dx.doi.org/10.3788/irla20210756.

Texto completo

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

24

Hou, Ya Li y Chang He Li. "The Dynamics Modeling and Simulation of Spindle System of Ultra-High Speed Grinding Machine Tool". Solid State Phenomena 175 (junio de 2011): 206–10. http://dx.doi.org/10.4028/www.scientific.net/ssp.175.206.

Texto completo

Resumen

This study was focused on the theoretical modeling and numerical simulation about the dynamic characteristics of spindle system of ultra-high speed grinder. Based on the rotor dynamics and structural system dynamics, a dynamic model was established using the transfer matrix method and the overall transfer matrix method. The critical speeds of first three orders, the modes of variation and other dynamic characteristic parameters of the spindle system were analyzed and calculated. The results showed that the working speed of the spindle system is much lower than the primary critical speed and can therefore stay away the resonance range effectively. Furthermore, the span of the fulcrum bearing and the overhang had significant influences on the critical speed within a certain range, and the study provided the basis and guidance for the structural design and performance optimization of the spindle system.

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

25

BANG, Junhyeok. "Excited Carrier Dynamics in Two-dimensional Materials". Physics and High Technology 29, n.º 9 (30 de septiembre de 2020): 15–21. http://dx.doi.org/10.3938/phit.29.032.

Texto completo

Resumen

When electrons in materials are excited, they undergo several dynamic processes such as carrier thermalization, transfer, and recombination. These fundamental excited state processes are crucial to understanding the microscopic principles at work in electronic and optoelectronic devices. This article introduces the excited carrier dynamics in a two-dimensional van der Waals material and reveals several interesting phenomena that do not occur in bulk materials. Particularly, the focus will be two dynamic processes: carrier multiplication and ultrafast charge transfer.

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

26

Wang, Hongqiao y Shuang Cheng. "Spatiotemporal Variation in Land Use of Northeast China Tiger and Leopard National Park". International Journal of Design & Nature and Ecodynamics 15, n.º 6 (26 de diciembre de 2020): 835–42. http://dx.doi.org/10.18280/ijdne.150609.

Texto completo

Resumen

This paper attempts to disclose the law of land use variation in the Northeast China Tiger and Leopard National Park (NCTLNP), and provide theoretical basis for eco-environment protection of the national park in future. The data on land use variation in four phases (i.e., 1995, 2005, 2015, and 2018) were selected for analysis based on the geographical information system (GIS). The variation and transfer features of land use were quantified, with the aid of single land use dynamic degree, comprehensive land use dynamic degree, and land use transfer matrix. The results show that: (1) In 1995-2008, the main land types in the NCTLNP were forest, grassland, and cultivated land, which took up more than 90% of the total area; the grassland area increased, while the areas of cultivated land and forest declined; forest was the land use with the largest transfer-out area (523.59 km2), about 55.29% of the total transfer-out area in the study area; (2) In the sample period, NCTLNP witnessed significant transfers between land uses; the transfers mostly occurred between forest, grassland, and cultivated land; forest transfers were observed in every county and city; the transfer of forest to grassland mainly concentrated in Dongning City. The research results lay the basis for building up a stereo eco-environment monitoring network in the study area, and provide the research direction for eco-environment protection in the NCTLNP.

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

27

Jing, Yongcheng, Xiao Liu, Yukang Ding, Xinchao Wang, Errui Ding, Mingli Song y Shilei Wen. "Dynamic Instance Normalization for Arbitrary Style Transfer". Proceedings of the AAAI Conference on Artificial Intelligence 34, n.º 04 (3 de abril de 2020): 4369–76. http://dx.doi.org/10.1609/aaai.v34i04.5862.

Texto completo

Resumen

Prior normalization methods rely on affine transformations to produce arbitrary image style transfers, of which the parameters are computed in a pre-defined way. Such manually-defined nature eventually results in the high-cost and shared encoders for both style and content encoding, making style transfer systems cumbersome to be deployed in resource-constrained environments like on the mobile-terminal side. In this paper, we propose a new and generalized normalization module, termed as Dynamic Instance Normalization (DIN), that allows for flexible and more efficient arbitrary style transfers. Comprising an instance normalization and a dynamic convolution, DIN encodes a style image into learnable convolution parameters, upon which the content image is stylized. Unlike conventional methods that use shared complex encoders to encode content and style, the proposed DIN introduces a sophisticated style encoder, yet comes with a compact and lightweight content encoder for fast inference. Experimental results demonstrate that the proposed approach yields very encouraging results on challenging style patterns and, to our best knowledge, for the first time enables an arbitrary style transfer using MobileNet-based lightweight architecture, leading to a reduction factor of more than twenty in computational cost as compared to existing approaches. Furthermore, the proposed DIN provides flexible support for state-of-the-art convolutional operations, and thus triggers novel functionalities, such as uniform-stroke placement for non-natural images and automatic spatial-stroke control.

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

28

Jin, Xiangyang, Li Gui Xian y Zhao Yong Qiang. "Torsional Vibration Dynamic Analysis of the Test Rig for Intersecting Axes Gears of Helicopters". Noise & Vibration Worldwide 42, n.º 11 (diciembre de 2011): 3–8. http://dx.doi.org/10.1260/0957-4565.42.11.3.

Texto completo

Resumen

In this paper, the transfer matrix method has been employed to analyze the torsional vibration dynamics of the test rig for closed intersecting axes beveloid gears of helicopter. The torsional vibration dynamic model has been established through adopting the transfer matrix method. At the same time, the mathematical model of the branch nodes and the dynamic analysis of test rig closed system have been also derived. The dynamic simulation principle of the test rig is studied and the corresponding dynamic load coefficients are also solved. Finally, the simulation curve of the vibration load coefficients of the test gears under different speed is drawn. The results shows that both the dynamic character of test rig and the loading precision can meet the test requirement.

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

29

Uddin, Md Mesbah, Raisa Akhtaruzzaman, Tanvir Ahmed Shanto y Mohammad Nasim Hasan. "Study the Performance of a Dynamic Wall Heat Exchanger Using Computational Fluid Dynamics". European Journal of Engineering and Technology Research 8, n.º 3 (16 de mayo de 2023): 38–42. http://dx.doi.org/10.24018/ejeng.2023.8.3.3043.

Texto completo

Resumen

Thermal systems in small devices like cooling electronic chips require efficient technologies with small diameter channels. These systems have laminar flow and disrupted boundary layers, leading to high pressure drop values. To ensure sufficient flow and limit coolant temperature, a possible solution is to dynamically deform one channel wall to mimic pumping and disrupt boundary layers, creating a peristaltic effect, called a dynamic heat exchanger. The aim of the present numerical study is to explore the effects of different operating parameters of the dynamic wall heat exchanger on the heat transfer performance. In our numerical study we varied different operating parameters (amplitude of vibration A, frequency f, minimum gap between upper and lower wall H and pressure difference P) and observed how it affects the performance of the dynamic wall heat exchanger in terms of mass flow rate of coolant (water) and heat transfer coefficient. A crucial finding is that the distribution of isotherms and streamlines is adequate, and heat transfer is significant when the relative amplitude is high. Additionally, this type of wall can generate substantial heat transfer even with minimal externally applied pressure.

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

30

Wulandari, Corry y Nadezhda Baryshnikova. "DID PUBLIC CASH TRANSFER CROWD OUT INTER-HOUSEHOLD TRANSFERS IN INDONESIA? EVIDENCE FROM "BANTUAN LANGSUNG TUNAI /BLT"". INFO ARTHA 3, n.º 2 (5 de noviembre de 2019): 67–84. http://dx.doi.org/10.31092/jia.v3i2.571.

Texto completo

Resumen

In 2005 the Government of Indonesia introduced an unconditional cash transfer program called the ‘Bantuan Langsung Tunai’ (BLT), aimed at assisting poor people who were suffering from the removal of a fuel subsidy. There are concerns, however, that the introduction of a public transfer system can negatively affect inter-household transfers through the crowding-out effect, which exists when donor households reduce the amount of their transfers in line with public transfers received from the government. The poor may not therefore have received any meaningful impact from the public cash transfer, as they potentially receive fewer transfers from inter-household private donors. For the government to design a public transfer system, it is necessary to properly understand the dynamics of private transfer behaviour. Hence, this study evaluates whether there exists a crowding-out effect of public transfers on inter-household transfers in Indonesia.Using data from the Indonesia Family Life Survey (IFLS) and by applying Coarsened Exact Matching (CEM) and Difference-in-differences (DID) approaches, this study found that the likelihood to receive transfers from other family members (non-co-resident) reduces when the household receives BLT. However, there is no significant impact of BLT on transfers from parents and friends.

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

31

Matalamäki, Marko, Elina Varamäki, Anmari Viljamaa, Juha Tall y Anna-Maria Mäkelä. "Unsuccessful SME Business Transfers". Journal of Enterprising Culture 28, n.º 02 (junio de 2020): 121–46. http://dx.doi.org/10.1142/s0218495820500065.

Texto completo

Resumen

Business transfers are linked to both the beginning and the end of entrepreneurial processes. A person can become an entrepreneur by acquiring an existing business instead of starting one, and exit from entrepreneurship can occur through selling the business. Business transfers are gradually becoming more common among small businesses, largely due to entrepreneurs’ aging, and thus deserve attention from entrepreneurship scholars. In particular, the issue of why and how business transfer negotiations fail without achieving a transfer has received little research attention. The purpose of this paper is to explore this phenomenon from potential buyers’ and sellers’ perspectives. The findings are based on a sample of 156 responses. The results suggest that the problems occurring in unfinished business transfers are quite numerous and the gaps between the views of the two negotiating parties are wider than in cases where business transfer negotiations are concluded successfully, indicating that the initial negotiation positions can be crucial. This research proposes some key elements to consider when planning an exit by business transfer and highlight the importance of unfinished small business transfers as an essential element of a dynamic business transfer market; a substantial proportion of the potential buyers and sellers are satisfied with the outcome even though the transfer did not occur.

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

32

Brunetkin, А. I. "Integrated approach to solving the fluid dynamics and heat transfer problems". Odes’kyi Politechnichnyi Universytet. Pratsi, n.º 2 (15 de diciembre de 2014): 108–15. http://dx.doi.org/10.15276/opu.2.44.2014.21.

Texto completo

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

33

Tewari, Anurag y Prabhat Verma. "An Improved User Identification based on Keystroke-Dynamics and Transfer Learning". Webology 19, n.º 1 (20 de enero de 2022): 5369–87. http://dx.doi.org/10.14704/web/v19i1/web19360.

Texto completo

Resumen

Transfer learning is one of the most appreciated classification techniques, when a small size of training dataset and limited computer capabilities exist along with the presence of noisy data. Such a scenario is encountered in keystroke dynamics whereby the typing gesticulation composed to form ‘keystroke dynamics’, is used to distinguish a human. Keystroke dynamics is persistently gaining reputation as one of the most promising and cost-effective behavioral biometrics. AlexNet and ResNet are two separate types of pre-trained convolutional neural network models, normally used to apply deep transfer learning concepts within image-based systems. Conversion of keystroke data into image data and then the formation of the artificial image data by extending available data are crucial attraction of this paper. In this paper, the pre-trained models are utilized by applying fine-tuning (of parameters in some layers) and used as an end-to-end learning and classification system by us. On the keystroke dataset, the feature extraction method (support vector machine for classification) is also applied here with pre-trained models. A relative analysis of both approaches is provided and lastly, the better one is employed in the proposed (recognition based) system. Finally, 98.57% accuracy of successful recognition is recorded.

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

34

Jaisridhar. P, Jaisridhar P. y S. Sangeetha S. Sangeetha. "Transfer of Technology and The Dynamics Involved in Adoption of Innovation". International Journal of Scientific Research 2, n.º 2 (1 de junio de 2012): 394–95. http://dx.doi.org/10.15373/22778179/feb2013/133.

Texto completo

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

35

Maltsev, A. "Network Dynamics of Technology Diffusion in International Arms Transfers". International Trends / Mezhdunarodnye protsessy 18, n.º 4 (2020): 36–61. http://dx.doi.org/10.17994/it.2020.18.4.63.5.

Texto completo

Resumen

This article explores the role of technology proliferation within the international arms trade as the major part of political structure of international system. The first part of the article suggests a brief overview of the existing studies of international arms transfer as an integral system in international relations, specifically emphasizing the impact of Krause’s (1992) “diffusion of technology” theoretical concept on the literature of 1990–2000-s. The focus of the review is on the intersection between the studies of specific technological transfers and more generalized empirical research works reveals an interesting scientific puzzle – on the one hand key arms manufacturer states accumulate most of the military R&D thus securing their place on the top of the suppliers’ hierarchy, but on the other hand more and more states acquire capabilities to produce military hardware and they more willingly interact with each other establishing strong horizontal bonds with each other to achieve some political independence and maximize economic efficiency (so-called globalization of arms production). In the second part of the article, the network-based approach is suggested as a solution to the market-hierarchy paradox, with some overview of the latest research of arms transfers via Social Network Analysis (SNA) methodology. The third and the last part of the article provides first empirical investigation of the international military technology transfers using original operationalization approach based on SIPRI Arms Transfer Database information of localized production interstate transfers. Finally, the network graphs are constructed to compare general centrality metrics and locate network communities using the Blondel’s method for community detection. The network topology demonstrates significant interconnections between secondary suppliers within technology transfers sub-network, compared to “regular” transfers sub-network, as well as the existence of a “feedback loop” for the license transfers. Overall the empirical results provide positive evidence for Krause’s “diffusion of technology” concept and also support previous network studies of dissimilarities between USA and USSR dependent sub-network – the asymmetry between them appears to be even more stark on the license transfers data.

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

36

Philippi, Frederik, Kateryna Goloviznina, Zheng Gong, Sascha Gehrke, Barbara Kirchner, Agílio A. H. Pádua y Patricia A. Hunt. "Charge transfer and polarisability in ionic liquids: a case study". Physical Chemistry Chemical Physics 24, n.º 5 (2022): 3144–62. http://dx.doi.org/10.1039/d1cp04592j.

Texto completo

Resumen

The practical use of ionic liquids benefits from an understanding of the underpinning structural and dynamic properties. Here we explore the interplay of charge transfer and polarisability in the molecular dynamics simulation of an ionic liquid.

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

37

Nakauchi, Motohiro, Mark Washburn y Kenji Klein. "Differences between inter- and intra-group dynamics in knowledge transfer processes". Management Decision 55, n.º 4 (15 de mayo de 2017): 766–82. http://dx.doi.org/10.1108/md-08-2016-0537.

Texto completo

Resumen

Purpose Knowledge transfer (KT) processes are important for building and sustaining competitive advantages and dynamic capabilities. Prior research often treats KT processes as a firm-level capability, assuming knowledge flows uniformly within a firm. The purpose of this paper is to examine whether such a view is too simplistic because it ignores potential differences between inter-group and intra-group KT processes within a firm. Design/methodology/approach The authors surveyed 137 software development professionals in a large Japanese electronics firm regarding co-workers who acted as critical sources of useful knowledge and the factors that affected KT within and across internal organizational boundaries. Using regression analysis, the authors test the extent to which factors such as the characteristics of the knowledge, the characteristics of the tie, and the characteristics of the network differentially affect KT within internal organizational boundaries vs across them. Findings The authors find that factors such as the accessibility of the knowledge source, network density, and collective teaching all help in transferring knowledge, while knowledge tacitness inhibit such transfers, but that the effect of these properties varies significantly depending on whether KT occurs across group boundaries. Originality/value Existing research on KT within firms tends to treat all such transfers as uniform, with little difference between the dynamics of within-group transfer and between-group transfer. This study establishes key differences in KT between and within organizational groups, demonstrating that managers need to consider internal boundaries when deploying tools and strategies for facilitating knowledge flows.

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

38

Stegmaier, Vincent, Rene F. Gorriz y Petra Imhof. "Protonation Dynamics in the K-Channel of Cytochrome c Oxidase Estimated from Molecular Dynamics Simulations". Processes 9, n.º 2 (29 de enero de 2021): 265. http://dx.doi.org/10.3390/pr9020265.

Texto completo

Resumen

Proton transfer reactions are one of the most fundamental processes in biochemistry. We present a simplistic approach for estimating proton transfer probabilities in a membrane protein, cytochrome c oxidase. We combine short molecular dynamics simulations at discrete protonation states with a Monte Carlo approach to exchange between those states. Requesting for a proton transfer the existence of a hydrogen-bonded connection between the two source and target residues of the exchange, restricts the acceptance of transfers to only those in which a proton-relay is possible. Together with an analysis of the hydrogen-bonded connectivity in one of the proton-conducting channels of cytochrome c oxidase, this approach gives insight into the protonation dynamics of the hydrogen-bonded networks. The connectivity and directionality of the networks are coupled to the conformation of an important protein residue in the channel, K362, rendering proton transfer in the entire channel feasible in only one of the two major conformations. Proton transport in the channel can thus be regulated by K362 not only through its possible role as a proton carrier itself, but also by allowing or preventing proton transport via water residues.

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

39

Tsou, Chun Wang, Pakarapong Supakarapongkul, Saksit Pornjirattikal y Yin Tsuo Huang. "Research of Knowledge Transfer Mechanisms and Environmental Uncertaint towards Renewable Energy in Thailand". Applied Mechanics and Materials 522-524 (febrero de 2014): 1850–52. http://dx.doi.org/10.4028/www.scientific.net/amm.522-524.1850.

Texto completo

Resumen

This explanatory research explores the relationship among environmental uncertainty, knowledge transfers mechanisms, dynamic capability, and competitive advantage. A total of 235 project managers employed by energy companies in Thailand were invited to participate in the study. The findings indicated that (a) through knowledge transfer mechanisms, project teams could develop an energy enterprises core competence and build its competitive advantage, (b) the relationship between environmental uncertainty and knowledge transfer mechanisms is negative, and (c) dynamic capability and competitive advantage have a positive relationship. The limitations of the study regarding generalization, and recommendations for future research to replicate the study in other countries, are also included.

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

40

Wang, Shusen. "Simulation of Evapotranspiration and Its Response to Plant Water and CO2 Transfer Dynamics". Journal of Hydrometeorology 9, n.º 3 (1 de junio de 2008): 426–43. http://dx.doi.org/10.1175/2007jhm918.1.

Texto completo

Resumen

Abstract Evapotranspiration (ET) is controlled by atmospheric demand, plant and soil hydraulic constraints, and the plant physiological activities that determine canopy resistance. This paper introduces a new ET scheme developed for the Ecological Assimilation of Land and Climate Observations (EALCO) model that integrates these controls into one dynamic system. This scheme is based on solving the governing equation system that represents the coupled canopy energy–water–CO2 transfer dynamics, where the canopy temperature Tc, plant water potential ψc, and leaf intercellular CO2 concentrations Ci are simultaneously obtained and used in ET calculations. Modeled ET was compared with eddy correlation flux measurement at a boreal aspen forest. Results showed that the correlation coefficient (R) between modeled and measured daily ET was greater than 0.96. The average absolute error was approximately 0.3 mm day−1. Modeled ET was generally higher than measured ET by 10%. This is consistent with the energy balance closure analyses from observations that showed that turbulent energy flux was frequently less than 90% of the total available energy. The effects of the plant CO2 and water transfer dynamics on ET simulations were investigated by running the model in two additional settings. These were 1) static Ci—where the ratio of Ci to atmospheric CO2 concentration was set to a constant value, and 2) static ψc—where the ψc was linearly related to soil water potential. The dynamic CO2 transfer scheme and the static Ci scheme produced relatively small differences in ET that mainly occurred at a subdaily time scale. Differences in ET produced using the dynamic water transfer scheme and the static ψc scheme depended on ecosystem water conditions and were more significant when the plant was under water stress. Ignoring the dynamic water transfer process in the model decreased the correlation coefficient between modeled and measured ET more significantly in drier years. This implies that the dynamic water transfer scheme is of more importance for ET estimates in arid or semiarid ecosystems.

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

41

Yin, Shaoxuan, Ren Yu, Wei Mao, Jian Song y Xiaoseng Song. "Dynamics Model Construction and Characteristic Analysis of Heat Pipe Nuclear Reactor in Thermal State". Journal of Physics: Conference Series 2534, n.º 1 (1 de junio de 2023): 012005. http://dx.doi.org/10.1088/1742-6596/2534/1/012005.

Texto completo

Resumen

Abstract In order to facilitate the power control method design of heat pipe nuclear reactor and avoid the high complexity of reactor core modelling, the paper adopts the lumped parameter method to build the thermal state dynamic model of heat pipe reactor. Firstly, the equivalence of the core structure and heat transfer process of the “MegaPower” heat pipe nuclear reactor is carried out to describe a single heat pipe in a hexagonal block. The complex heat transfer process in reactor core is simplified into a two-zone heat transfer model with only fuel and monolith. And the equivalent thermal resistance is used to describe the heat conduction process within gas gap and heat pipe. Then, the reactor core nuclear dynamic model is established using the neutron dynamics equation of point-reactor. Based on the principle of heat balance, the thermal dynamics models of fuel, gas gap, monolith and heat pipe are established respectively, so as to form the state equations of heat generation and heat transfer process in reactor core. Finally, the dynamic characteristics of the reactor with the reactivity disturbance without external control are simulated and analysed. The results show that the heat pipe reactor has a certain self-stability with reactivity disturbance, but the stability time is long, and the power fluctuation is large.

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

42

Chen, Bo y Bao Yin Li. "Analysis and Research on Modeling Methods of Mems Coupling Dynamic System of Ultrasonic Motor". Applied Mechanics and Materials 533 (febrero de 2014): 303–6. http://dx.doi.org/10.4028/www.scientific.net/amm.533.303.

Texto completo

Resumen

The ultrasonic motor is a complex dynamic system, which be divided into an electro-mechanical coupling system and a drive and control system. The core of the electro-mechanical coupling system lies in excitation of elliptical movement of the mass points on the surface of the stator and frictional transfer of the power and the movement. Modeling of the electro-mechanical coupling dynamic system of the ultrasonic motor substantially comprises two aspects. First, the dynamic system is viewed as an integral transfer function, and an intuitive relationship between input of the electric energy and output of the power is established. Second, geometric parameters and material parameters of mechanisms are closely correlated with dynamics of the mechanisms.

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

43

Mameri, Fateh, Eric Delacourt, Céline Morin y Jesse Schiffler. "0D Dynamic Modeling and Experimental Characterization of a Biomass Boiler with Mass and Energy Balance". Entropy 24, n.º 2 (28 de enero de 2022): 202. http://dx.doi.org/10.3390/e24020202.

Texto completo

Resumen

The paper presents an experimental study and a 0D dynamic modeling of a biomass boiler based on the Bond Graph formalism from mass and energy balance. The biomass boiler investigated in this study is an automatic pellet boiler with a nominal power of 30 kW with a fixed bed. The balances allow to model as time function the flue gas enthalpy flux variation and the thermal transfers between the flue gas and the walls of the boiler subsystems. The main objective is to build a model to represent the dynamic thermal behavior of the boiler. Indeed, small domestic boilers have discontinuous operating phases when the set temperature is reached. The global thermal transfer coefficients for the boiler subsystems are obtained according to an iterative calculation by inverse method. The boiler has an average efficiency of 67.5% under our operating conditions and the radiation is the dominant thermal transfer by reaching 97.6% of the total thermal transfers inside the combustion chamber. The understanding of the dynamic behavior of the boiler during the operating phases allows to evaluate its energy performances. The proposed model is both stimulated and validated using experimental results carried out on the boiler.

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

44

Bykovskaya, Elena F. y Veronika S. Sulyaeva. "Determination of the hysteresis of the contact angle of wetting of boiling surfaces". E3S Web of Conferences 459 (2023): 08001. http://dx.doi.org/10.1051/e3sconf/202345908001.

Texto completo

Resumen

For a deeper understanding of the fluid dynamics and heat transfer in the transition layer, when studying the dynamics of a two-phase flow during boiling and a heat transfer crisis, i.e. in the region of the dynamic gas-liquid-solid contact line and the adjacent meniscus, characterized by an apparent contact angle, it is necessary to analyse the wettability, contact angle hysteresis, and surface morphology. In this paper, samples of a graphene-coated copper substrate, a surface with nanotubes, and an uncoated copper surface for comparison are considered.

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

45

Sachse, Regina, Aleksandar Pavic y Paul Reynolds. "Human-Structure Dynamic Interaction in Civil Engineering Dynamics: A Literature Review". Shock and Vibration Digest 35, n.º 1 (1 de enero de 2003): 3–18. http://dx.doi.org/10.1177/0583102403035001624.

Texto completo

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

46

Plotnikov, Leonid. "Thermal-mechanical characteristics of stationary and pulsating gas flows in a gas-dynamic system (in relation to the exhaust system of an engine)". Thermal Science, n.º 00 (2021): 171. http://dx.doi.org/10.2298/tsci201029171p.

Texto completo

Resumen

It is a relevant objective in thermal physics and in building reciprocating internal combustion engines (RICE) to obtain new information about the thermal-mechanical characteristics of both stationary and pulsating gas flows in a complex gas-dynamic system. The article discusses the physical features of the gas dynamics and heat transfer of flows along the length of a gas-dynamic system typical for RICE exhaust systems. Both an experimental set-up and experimental techniques are described. An indirect method for determining the local heat transfer coefficient of gas flows in pipelines with a constant temperature hot-wire anemometer is proposed. The regularities of changes in the instantaneous values of the flow rate and the local heat transfer coefficient in time for stationary and pulsating gas flows in different elements of the gas-dynamic system are obtained. The regularities of the change in the turbulence number of stationary and pulsating gas flows along the length of RICE gas-dynamic systems are established (it is shown that the turbulence number for a pulsating gas flow is 1.3-2.1 times higher than for a stationary flow). The regularities of changes in the heat transfer coefficient along the length of the engine?s gas-dynamic system for stationary and pulsating gas flows were identified (it was established that the heat transfer coefficient for a stationary flow is 1.05-1.4 times higher than for a pulsating flow). Empirical equations are obtained to determine the turbulence number and heat transfer coefficient along the length of the gas-dynamic system.

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

47

Chang, F. y Z.-H. Lu. "Dynamic model of an air spring and integration into a vehicle dynamics model". Proceedings of the Institution of Mechanical Engineers, Part D: Journal of Automobile Engineering 222, n.º 10 (1 de octubre de 2008): 1813–25. http://dx.doi.org/10.1243/09544070jauto867.

Texto completo

Resumen

It is worthwhile to design a more accurate dynamic model for air springs, to investigate the dynamic behaviour of an air spring suspension, and to analyse and guide the design of vehicles with air spring suspensions. In this study, a dynamic model of air spring was established, considering the heat transfer process of the air springs. Two different types of air spring were tested, and the experimental results verified the effectiveness of the air spring model compared with the traditional model. The key factors affecting the computation accuracy were studied and checked by comparing the results of the experiments and simulations. The new dynamic model of the air spring was integrated into the full-vehicle multi-body dynamics model, in order to investigate the air suspension behaviour and vehicle dynamics characteristics. The co-simulation method using ADAMS and MATLAB/Simulink was applied to integration of the air spring model with the full-vehicle multi-body dynamics model.

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

48

Yu, Jiu Yang, Li Jun Liu, Wei Lin, Qian Liu, Wen Hao Yang, Si Hao Nie y Yi Wen Chen. "Numerical Simulation and Field Synergy Analysis of Flow and Heat Transfer in a Vibratory Tube". Advanced Materials Research 516-517 (mayo de 2012): 949–53. http://dx.doi.org/10.4028/www.scientific.net/amr.516-517.949.

Texto completo

Resumen

The present paper focuses on the analysis of transient heat transfer and flow in a vibratory tube. The characteristics of flow and heat transfer are investigated by dynamic mesh of CFD (computational fluid dynamics) software FLUENT, the velocity and temperature distributions in a vibration cycle are analyzed by field synergy theory. The results indicate that the vibration parameters have great effect on heat transfer, and the tube vibration leads to heat transfer enhancement or reduction. Moreover, the optimum heat transfer performance inside tubes is obtained in a half-cycle when time phase is 90°.

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

49

Boucher, R. F. y E. E. Kitsios. "The Dynamics of Vortex Amplifiers. Part 2: Dynamic Measurements and Comparison With Model Predictions". Journal of Dynamic Systems, Measurement, and Control 107, n.º 3 (1 de septiembre de 1985): 182–86. http://dx.doi.org/10.1115/1.3140718.

Texto completo

Resumen

A general experimental procedure is described for determining the linearized transfer admittances of a vortex amplifier. Flow response at the ports to a measured pressure perturbation applied to any one of them was obtained by hot wire anemometer. Self and transfer admittances were determined using a dual channel spectrum analyzer. The difficulties involved in such experiments are discussed. Measurements at two working points compare well with those predicted by the theoretical model developed in Part 1 of this paper.

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

50

JACKSON, E. ATLEE y I. GROSU. "TOWARD EXPERIMENTAL IMPLEMENTATIONS OF MIGRATION CONTROLS". International Journal of Bifurcation and Chaos 05, n.º 06 (diciembre de 1995): 1767–72. http://dx.doi.org/10.1142/s0218127495001320.

Texto completo

Resumen

Jackson and Grosu developed a method for controlling complex dynamic systems that employs an open-plus-closed-loop control components (the OPCL method), and proved that it is capable of entraining the dynamics of standard dynamic systems to arbitrary goal dynamics, g(t) ∈ Rn [Jackson & Grosu, 1995]. Rather than use this control for entrainment, one of us has shown [Jackson, 1995] how the OPCL can be easily employed to transfer the dynamics of a multiple-attractor system from one attractor to another ("migration controls" [Jackson, 1990]). For this purpose, a Chua-circuit model with five distinct attractors was used. In the present study we will show how to experimentally implement the OPCL migration control on such a circuit, by using prerecorded signals, which makes it possible to restrict the control action to only one dynamic component.

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

Artículos de revistas sobre el tema "Dynamic of transfert"

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