7,848 research outputs found
X(1835): A Possible Baryonium?
We point out that (1) the large coupling and suppressed mesonic
coupling of X(1835) and (2) the suppression of the three-body strange final
states strongly indicate that X(1835) may be a baryonium. We also
point out that the branching ratio of should be bigger
than that of . If BES further confirms the
non-observation of X(1835) in the channel, that will be very
puzzling. Finally, X(1835) may be used a tetraquark generator if X(1835) is
really established as a baryonium state.Comment: Comments and suggestions welcom
LFV couplings of the extra gauge boson Z' and leptonic decay and production of pseudoscalar mesons
Considering the constraints of the lepton flavor violating (LFV) processes
and on the LFV couplings
, in the contexts of the models, the left-right
(LR) models, the "alternative" left-right (ALR) models and the 331 models, we
investigate the contributions of the extra gauge boson to the decay rates
of the processes ,
and with and
. Our numerical results show that the maximal values of the branching
ratios for these processes are not dependent on the mass at
leader order. The extra gauge boson predicted by the models
can make the maximum value of the branching ratio
reach . All
models considered in this paper can produce significant contributions to the
process . However, the value of
is far below its corresponding experimental upper bound.Comment: 14 pages, 2 figures; matches published versio
Community Detection by -penalized Graph Laplacian
Community detection in network analysis aims at partitioning nodes in a
network into disjoint communities. Most currently available algorithms
assume that is known, but choosing a correct is generally very
difficult for real networks. In addition, many real networks contain outlier
nodes not belonging to any community, but currently very few algorithm can
handle networks with outliers. In this paper, we propose a novel model free
tightness criterion and an efficient algorithm to maximize this criterion for
community detection. This tightness criterion is closely related with the graph
Laplacian with penalty. Unlike most community detection methods, our
method does not require a known and can properly detect communities in
networks with outliers.
Both theoretical and numerical properties of the method are analyzed. The
theoretical result guarantees that, under the degree corrected stochastic block
model, even for networks with outliers, the maximizer of the tightness
criterion can extract communities with small misclassification rates even when
the number of communities grows to infinity as the network size grows.
Simulation study shows that the proposed method can recover true communities
more accurately than other methods. Applications to a college football data and
a yeast protein-protein interaction data also reveal that the proposed method
performs significantly better.Comment: 40 pages, 15 Postscript figure
The Choice Architecture of Choice Architecture: Toward a Nonpaternalistic Nudge Policy
This The goal of nudge policy is generally presented as assisting people in finding their “true” preferences. Supporters argue that nudge policies meet a libertarian paternalism criterion. This claim has provoked complaints that nudge policies are unacceptably paternalistic. This paper suggests that by changing the explicit goal of nudge policy to a goal of making the choice of choice mechanism an explicit decision variable of the subgroup being affected by the nudge one can have a non-paternalistic nudge policy that better fits with the values inherent in Classical liberalism. The goal of non-paternalistic nudge policy is not to achieve a better result as seen by government or by behavioral economists. The goal of non-paternalistic nudge policy is to achieve a better result as seen by the agents being nudged as revealed through their choices of choice mechanisms. Examples are given of how nonpaternalistic nudge policy will and will not differ from paternalistic nudge policy.libertarian, paternalism, nudge policy, choice architecture, behavioral economics
The Choice Architecture of Choice Architecture: Toward a Non-Paternalistic Nudge Policy
The paper seeks to recast the goal of nudge policy from a goal of achieving a specific result determined by government or by behavioral economists to a goal of giving individuals as much power as is practical to decide the choice architecture they face. We call a nudge with such a giving individuals “power over choice mechanisms” goal a non-paternalistic nudge policy. The goal of nonpaternalistic nudge policy is not to achieve a better result as seen by government or by behavioral economists. The goal of non-paternalistic nudge policy is to achieve a better result as seen by the agents being nudged as revealed through their choices of choice architectures. We argue that non-paternalistic nudge policy fits much better with the values inherent in Classical liberalism than does libertarian paternalistic nudge policy.
Transplanckian Dispersion Relation and Entanglement Entropy of Blackhole
The quantum correction to the entanglement entropy of the event horizon is
plagued by the UV divergence due to the infinitely blue-shifted near horizon
modes. The resolution of this UV divergence provides an excellent window to a
better understanding and control of the quantum gravity effects. We claim that
the key to resolve this UV puzzle is the transplanckian dispersion relation. We
calculate the entanglement entropy using a very general type of transplanckian
dispersion relation such that high energy modes above a certain scale are
cutoff, and show that the entropy is rendered UV finite. We argue that modified
dispersion relation is a generic feature of string theory, and this boundedness
nature of the dispersion relation is a general consequence of the existence of
a minimal distance in string theory.Comment: 7 pages. To appear in the proceedings of 36th International Symposium
Ahrenshoop on the theory of Elementary Particles: Recent Developments in
String/M Theory and Field Theory, Berlin, Germany, 26-30 Aug 200
Cracking pressure control of parylene checkvalve using slanted tensile tethers
MEMS check valves with fixed cracking pressures are important in micro-fluidic applications where the pressure, flow directions and flow rates all need to be carefully controlled. This work presents a new surface-micromachined parylene check valve that uses residual thermal stress in the parylene to control its cracking pressure. The new check valve uses slanted tethers to allow the parylene tensile stress to apply a net downward force on the valving seat against the orifice. The angle of the slanted tethers is made using a gray-scale mask to create a sloped sacrificial photoresist with the following tether parylene deposition. The resulted check valves have both the cracking pressures and flow profiles agreeable well with our theoretical analysis
Dynamic simulation of a peristaltic micropump considering coupled fluid flow and structural motion
This paper presents lumped-parameter simulation of dynamic characteristics of peristaltic micropumps. The pump consists of three pumping cells connected in series, each of which is equipped with a compliant diaphragm that is electrostatically actuated in a peristaltic sequence to mobilize the fluid. Diaphragm motion in each pumping cell is first represented by an effective spring subjected to hydrodynamic and electrostatic forces. These cell representations are then used to construct a system-level model for the entire pump, which accounts for both cell- and pump-level interactions of fluid flow and diaphragm vibration. As the model is based on first principles, it can be evaluated directly from the device's geometry, material properties and operating parameters without using any experimentally identified parameters. Applied to an existing pump, the model correctly predicts trends observed in experiments. The model is then used to perform a systematic analysis of the impact of geometry, materials and pump loading on device performance, demonstrating its utility as an efficient tool for peristaltic micropump design
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