scholarly journals Interface Roughening with a Time-Varying External Driving Force

1993 ◽  
Vol 21 (4) ◽  
pp. 401-406 ◽  
Author(s):  
E Hernández-García ◽  
T Ala-Nissila ◽  
M Grant
Keyword(s):  
Driving Force ◽  
Time Varying ◽  
Interface Roughening ◽  
External Driving

Molecular dynamics simulation studies on the plastic behaviors of an iron nanowire under torsion

RSC Advances ◽  
2016 ◽  
Vol 6 (34) ◽  
pp. 28792-28800 ◽  
Author(s):  
Chong Qiao ◽  
Yanli Zhou ◽  
Xiaolin Cai ◽  
Weiyang Yu ◽  
Bingjie Du ◽  
...  
Keyword(s):  
Molecular Dynamics ◽  
Plastic Deformation ◽  
Molecular Dynamics Simulation ◽  
Deformation Mechanism ◽  
Driving Force ◽  
Dynamics Simulation ◽  
Simulation Studies ◽  
Plastic Deformation Mechanism ◽  
Constant Torsion ◽  
External Driving

The plastic deformation mechanism of iron (Fe) nanowires under torsion is studied using the molecular dynamics (MD) method by applying an external driving force at a constant torsion speed.

A Research on the Driving Forces of Xinjiang Geological Heritage Resources Development from the Perspective of Tourism

2012 ◽  
Vol 518-523 ◽  
pp. 5905-5908 ◽  
Author(s):  
Cui Lin Li
Keyword(s):  
Sustainable Development ◽  
Driving Force ◽  
Government Regulation ◽  
Driving Forces ◽  
Geological Heritage ◽  
Regional Economic ◽  
Resource Endowment ◽  
The Government ◽  
External Driving ◽  
Resources Development

Developing geological heritage resource from the perspective of tourism is a new pattern of resource using. The development of Xinjiang geological heritage resource is restricted and effected by the internal and external driving forces and support. The internal driving force includes the resource endowment and the need for regional economic and sustainable development; the external driving force includes the competition of tourism, the market and the government regulation; support includes the construction of infrastructure, the improvement of tourism facilities and ecological support. All these forces restrict and effect each other and become a harmonious whole.

Identifying the Mechanisms of Enhanced Water Flow Through Carbon Nanotubes

2008 ◽  
Author(s):  
J. A. Thomas ◽  
A. J. H. McGaughey
Keyword(s):  
Carbon Nanotubes ◽  
Water Flow ◽  
Flow Rate ◽  
Driving Force ◽  
Slip Length ◽  
Dynamics Simulation ◽  
Flow Area ◽  
Water Viscosity ◽  
Flow Through ◽  
External Driving

Pressure-driven water flow through carbon nanotubes (CNTs) with diameters ranging from 1.66 nm to 4.99 nm is examined using molecular dynamics simulation. The flow rate enhancement, defined as the ratio of the observed flow rate to that predicted from the no-slip Hagen-Poiseuille relation, is calculated for each CNT. The enhancement decreases with increasing CNT diameter and ranges from 433 to 47. By calculating the variation of water viscosity and slip length as a function of CNT diameter, it is found that the results can be fully explained in the context of continuum fluid mechanics. The enhancements are lower than previously reported experimental results, which range from 560 to 100000, suggesting a miscalculation of the available flow area and/or the presence of an uncontrolled external driving force (such as an electric field) in the experiments.

scholarly journals Dynamic analysis of ecological security in central Yunnan province, China from 1990 to 2017

2021 ◽  
Vol 932 (1) ◽  
pp. 012002
Author(s):  
F Liu ◽  
C H Gao ◽  
J L Wang ◽  
J C H Zhou ◽  
J M Sha
Keyword(s):  
Driving Force ◽  
Yunnan Province ◽  
Control Measures ◽  
Evaluation Index System ◽  
Matrix Analysis ◽  
Regional Security ◽  
Ecological Security ◽  
Location Factors ◽  
Security Research ◽  
External Driving

Abstract Ecological security is an important content of national and regional security research. The Central Yunnan Province (CYP) has important location factors and social and economic development status, so ecological security research in CYP is quite relevant. For the purpose of our research, we adopted the S-PRD (Ecological Insecurity-Pressure-Regulation-External Driving Force) conceptual model to establish an evaluation index system based on the four subsystems of water, land, atmosphere, and biology to evaluate the ecological security of central Yunnan from 1990 to 2017 and analyse the characteristics of dynamic evolution. We used the grey incidence matrix analysis method to conduct retrospective grey relational evaluation and retrospective grey sensitivity evaluation and analyse the influencing factors of ecological security. The study conclusions showed that the security of the water system has been fluctuating and rising, and has stabilized in the past five years. Both the land system and the biological system have shown an upward trend, but the degree of change was relatively small, and the atmospheric system was stable. The evaluation value of the ecological environment insecurity of the four cities is generally on the rise. The control measures have the greatest impact on ecological insecurity, the second important factor is an external driving force.

Effects of supply chain position on the motivation and practices of firms going green

2013 ◽  
Vol 34 (1) ◽  
pp. 93-114 ◽  
Author(s):  
Sonia M. Lo
Keyword(s):  
Supply Chain ◽  
Driving Force ◽  
Demand Uncertainty ◽  
Driving Forces ◽  
High Tech ◽  
High Tech Industry ◽  
Content Type ◽  
Green Practices ◽  
The Relationship ◽  
External Driving

Purpose – The aim of this study is to understand the effect of a firm's position in a supply chain in its industry on the attitude of the firm toward green strategies through empirical data analysis. This study aims to answer the following research questions: Do the environmental uncertainties a firm faces differ with the firm's position in the supply chain when going green?, Would the motivation of a firm for going green vary with uncertainties it faces in the supply chain? and Would green-related practices a firm accepts or executes vary with the firm's position in the supply chain? Design/methodology/approach – The case study method was utilized in this study. The main objects are firms in the high-tech industry of Taiwan, and 12 firms were selected for in-depth investigation. The unit of analysis was a firm. Face-to-face in-depth interviews, approximately 90-105 minutes for each, were conducted with each of the 12 cases. The respondents were middle- to high-level managers. The interviews were recorded and transcribed. Additionally, second-hand information was acquired regarding each case through channels such as firm web sites, documents, and media reports. These integrated data were later utilized in the single-case and cross-case analysis stages. Findings – In this study, firms of Taiwan's high-tech industry are divided into the upstream (raw material supplier), midstream (original design manufacturers/original equipment manufacturer), and downstream (brand company) categories. It is first found the uncertainties a firm encounters when implementing green practices are related to its position in the supply chain. The closer a firm is to the upstream of the supply chain, the higher the competitive uncertainty. In contrast, the closer a firm is to the downstream, the higher the demand uncertainty. Furthermore, the internal and external driving forces of firms in promoting green practices are related to the types of uncertainties the firms encounter in the supply chain. A firm's internal driving force is positively associated with the demand uncertainty it faces, however, negatively with the competition and supply uncertainties. On the other hand, a firm's external driving force is positively associated with the competition and supply uncertainties it faces, however, negatively with the demand uncertainties. Additionally, the association between firm willingness to promote green practices and its position in the supply chain is explored. It is found that, for firms located in the downstream of supply chain, it emphasizes more on the practices of green design, purchase, and internal environmental management. If a firm is located in the midstream of supply chain, it will focus more on the practice of green manufacturing and logistics. Originality/value – This study has expanded the discussion of green supply chain management. It establishes the relationship between the uncertainties and the major driving forces of firms for implementing green practices. This approach is rare in previous literature. Furthermore, past literature has suggested that a specific relationship exists between driving factors and firm practices. The author believes that such a relationship must be based on the position of firms in the supply chain; thus, the author has identified the relationship between supply chain position and green practices.

Control of Current Reversal and Separation of Particles in Inertia Ratchets

2003 ◽  
Vol 790 ◽  
Author(s):  
F. Family ◽  
H.A. Larrondo ◽  
C.M. Arizmendi
Keyword(s):  
Driving Force ◽  
Control Parameter ◽  
Basins Of Attraction ◽  
Fractal Nature ◽  
Mean Velocity ◽  
Small Perturbations ◽  
Control Techniques ◽  
The Mean ◽  
Current Reversal ◽  
External Driving

ABSTRACTWe have studied the deterministic dynamics of underdamped single and multiparticle ratchets associated with current reversal, as a function of both the amplitude and the frequency of an external driving force. We show that control of current reversals in deterministic inertia ratchets is possible as a consequence of a locking process associated with different mean velocity attractors. Control processes employing small perturbations on the frequency and the amplitude of the external force may be designed in view of the intermixed fractal nature of the domains of attraction of the mean velocity attractors. The range where each control parameter is capable of reversing the current is determined. Quenched noise has significant effect on the basins of attraction. In particular, with increasing disorder the direction of a packet of particles can be reversed, leading to disappearance or weakening of the negative velocity attractor. The influence of the mass of the particles is also considered in order to design control techniques capable of separating particles of different masses.

scholarly journals Does Economic Growth Driving Force Convert? Evidence from China

2020 ◽  
Vol 2020 ◽  
pp. 1-11
Author(s):  
Zejun Li ◽  
Zimei Huang ◽  
Tinghui Li
Keyword(s):  
Economic Growth ◽  
Structural Transformation ◽  
Driving Force ◽  
Driving Forces ◽  
Economic Transformation ◽  
Policy Implications ◽  
Chinese Government ◽  
Time Varying ◽  
Fixed Capital Formation ◽  
Innovation Capacity

The conversion from conventional to new driving forces and their time-varying characteristics are of great importance to China’s economic transformation. In this paper, we attempt to investigate the economic growth driving force conversion in China and the time-varying characteristics of driving forces by constructing a time-varying coefficient panel data model during the period of 1998–2015. The empirical results indicate that China’s economy has undergone driving force conversion. Specifically, China’s economic growth driving forces have been transformed from traditional ones (human capital and gross fixed capital formation) to new ones (innovation capacity and structural transformation). Furthermore, we find that the characteristics of the driving forces are time-varying and heterogeneous. Innovation capacity and structural transformation have a more crucial impact on economic growth. Finally, based on the conclusions of the quantitative analysis, some important policy implications can be pursued to foster economic growth. Chinese government ought to enact various policies that are conducive to enhancing innovation capacity and accelerating structural transformation.

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