3,051 research outputs found
Simulating the dynamic behavior of droplet in a grooved channel by dissipative particle dynamics
In this paper, an improved dissipative particle dynamics (DPD) method was applied to simulate droplet motion in a grooved microchannel. Firstly the static contact angle between the droplet and the solid wall was simulated with the improved potential function, and "static contact angle~awf/af " curve was obtained by Polynomial Fit of the 2nd order. Then the influences of wall wettability, flow field force on the flow pattern of droplet were investigated
in a grooved microchannel. The results show that wall wettability and flow field force have large effects on the flow pattern of the droplet
Geometrical complexity of conformations of ring polymers under topological constraints
One measure of geometrical complexity of a spatial curve is the number of
crossings in a planar projection of the curve.
For -noded ring polymers with a fixed knot type, we evaluate numerically
the average of the crossing number over some directions. We find that the
average crossing number under the topological constraint are less than that of
no topological constraint for large . The decrease of the geometrical
complexity is significant when the thickness of polymers is small.
The simulation with or without a topological constraint also shows that the
average crossing number and the average size of ring polymers are independent
measures of conformational complexity.Comment: 8 pages, 4figure
On the existence of P-1,3(o) resonances in H- between n=2 and 3 H thresholds
We examine the influence of relativistic and QED effects oil the existence of the P-1.3(o) H- resonances between n = 2 and 3 hydrogen thresholds, the relativistic and QED corrections and the coupling effects between the high singlet and triplet states are considered as first-order perturbations. We firstly obtain accurate non-relativistic resonant energies and widths of fifteen P-1(o) resonances, and fifteen P-3(o) resonances. The fifteen P-1(o) resonances are classified to be (3)(2, 0)(n)(-) (4 less than or equal to n less than or equal to 12) and (3)(1, 1)(n)(+) (3 less than or equal to n less than or equal to 8). The fifteen P-3(o) resonances are classified to be (3)(2, 0)(n)(+) (3 less than or equal to n less than or equal to 12) and (3)(1, 1)(n)(-) (4 less than or equal to n less than or equal to 8). We found there exist six Feshbach resonances for (3)(2, 0)(n)(-) (P-1(o)) series, four Feshbach resonances for (3)(1, 1)(n)(+) (P-1(o)) series, seven Feshbach resonances for (3)(2, 0)(n)(+)(P-3(o)) series, and three Feshbach resonances for (3)(1, 1)(n)(-)(P-1(o)) series
Massless monopoles and the moduli space approximation
We investigate the applicability of the moduli space approximation in
theories with unbroken non-Abelian gauge symmetries. Such theories have
massless magnetic monopoles that are manifested at the classical level as
clouds of non-Abelian field surrounding one or more massive monopoles. Using an
SO(5) example with one massive and one massless monopole, we compare the
predictions of the moduli space approximation with the results of a numerical
solution of the full field equations. We find that the two diverge when the
cloud velocity becomes of order unity. After this time the cloud profile
approximates a spherical wavefront moving at the speed of light. In the region
well behind this wavefront the moduli space approximation continues to give a
good approximation to the fields. We therefore expect it to provide a good
description of the motion of the massive monopoles and of the transfer of
energy between the massive and massless monopoles.Comment: 18 pages, 5 figure
Certain subclasses of multivalent functions defined by new multiplier transformations
In the present paper the new multiplier transformations
\mathrm{{\mathcal{J}% }}_{p}^{\delta }(\lambda ,\mu ,l) (\delta ,l\geq
0,\;\lambda \geq \mu \geq 0;\;p\in \mathrm{% }%\mathbb{N} )} of multivalent
functions is defined. Making use of the operator two new subclasses and \textbf{\ }of multivalent analytic
functions are introduced and investigated in the open unit disk. Some
interesting relations and characteristics such as inclusion relationships,
neighborhoods, partial sums, some applications of fractional calculus and
quasi-convolution properties of functions belonging to each of these subclasses
and
are
investigated. Relevant connections of the definitions and results presented in
this paper with those obtained in several earlier works on the subject are also
pointed out
Power-Gating Technique for Network-on-Chip Buffers
A new approach to reducing leakage power in network-on-chip buffers is presented. The non-uniformity of buffer utilisation is leveraged across the network and power-gating is applied to scarcely utilised buffers. Instead of turning-off the buffers completely, a buffer portion is kept turned-on. This design choice has a significant performance benefit because the buffer is always able to receive network packets. Design aspects and trade-offs in a 45 nm CMOS technology are discussed and results obtained over video application benchmarks are presented. It is shown that it is possible to reduce buffer leakage by 40% without performance penalt
An Investigation into Contribution I-Intention and We-Intention in Open Web-Based Encyclopedia: Roles of Joint Commitment and Mutual Agreement
In the current study, knowledge contribution in open web-based encyclopedia is conceptualized as a group-referent intentional social action, and we-intention, which reflects oneâs perception of the group acting as a unit, has been employed. The motivation of this study thus is to better understand antecedents and consequences of contribution I-intention and we-intention in open web-based encyclopedia. A research model was developed and empirically examined with 202 knowledge contributors in two most famous wiki communities in Mainland China. The results demonstrated that personal outcome expectations exert significant effects on both intentions. Joint commitment, mutual agreement and community-related outcome expectations are significantly related to we-intention to contribute, but not related to I-intention. In addition, we-intention has a statistically significant positive effect on contribution behavior. However, I-intention negatively relates to contribution behavior. We believe this study will serve as a starting point for furthering our limited understanding of the intentional social action in knowledge management research
Exploring the Role of Gender on Bloggers\u27 Switching Behaviors
Blog has become an increasingly popular form of new information technology (IT) in recent years. Many world famous web sites (e.g., Microsoft, Yahoo!, and Google) are providing blog services on the Internet. Bloggers, therefore, can easily establish and maintain their blogs through such services. However, research on blogsâ adoption and diffusion is rare. In this study, we attempt to study bloggersâ post-adoption behaviors. We examine bloggersâ intention to switch their blog services building upon the marketing and IS literature. Particularly, the role of gender is explored and an online survey is conducted to test the research model. Findings confirm that bloggersâ intention to switch their blog services is strongly associated with three factors: satisfaction, sunk costs, and attractive alternatives. Meanwhile, gender is found to moderate the relationship between satisfaction and intention to switch the blog service. Implications for both researchers and practitioners are provided
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Identifying Targets for COPD Treatment Through Gene Expression Analyses
Despite the status of chronic obstructive pulmonary disease (COPD) as a major global health problem, no currently available therapies can limit COPD progression. Therefore, an urgent need exists for the development of new and effective treatments for COPD. An improved understanding in the molecular pathogenesis of COPD can potentially identify molecular targets to facilitate the development of new therapeutic modalities. Among the best approaches for understanding the molecular basis of COPD include gene expression profiling techniques, such as serial analysis of gene expression or microarrays. Using these methods, recent studies have mapped comparative gene expression profiles of lung tissues from patients with different stages of COPD relative to healthy smokers or non-smokers. Such studies have revealed a number of differentially-regulated genes associated with COPD progression, which include genes involved in the regulation of inflammation, extracellular matrix, cytokines, chemokines, apoptosis, and stress responses. These studies have shed new light on the molecular mechanisms of COPD, and suggest novel targets for clinical treatments
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