3,414 research outputs found
SWKB and proper quantization conditions for translationally shape invariant potentials
Using a recently proposed classification for the primary translationally
shape invariant potentials, we show that the exact quantization rule formulated
by Ma and Xu is equivalent to the supersymmetric JWKB quantization condition.
The energy levels for the two considered categories of shaped invariant
potentials are also derived
HaLow Wi-Fi performance in multiusers and channels environment with MATLAB Simulink
HaLow Wi-Fi (IEEE 802.11ah) wireless networking standard. As opposed to 2.4 GHz and 5 GHz-based conventional Wi-Fi networks, it leverages 900 MHz frequencies license-exempt for enabling networks Wi-Fi with a longer range. Lower energy usage makes it possible to build extensive networks of sensors or stations that work together to communicate signals, which is another advantage. In this paper IEEE 802.11ah Wi-Fi system design and implemented using MATLAB Simulink and tested under multiusers and channels environment in terms of Spectrum analyzer and constellation Diagram where 4 users, 2 MHz and 4 MHz channels bandwidth used to perfume the test also power of coarse synchronization, fine synchronization and initial channel estimation, to make Wi-Fi networks with a greater range possible were illustrated in space time stream
Nonfactorization in Hadronic Two-body Cabibbo-favored decays of D^0 and D^+
With the inclusion of nonfactorized amplitudes in a scheme with , we
have studied Cabibbo-favored decays of and into two-body hadronic
states involving two isospins in the final state. We have shown that it is
possible to understand the measured branching ratios and determined the sizes
and signs of nonfactorized amplitudes required.Comment: 15 pages, Late
Computer Simulation of Current Forces on Motion of Floating Production Storage and Offloading in Irregular Waves
This paper presents the effect of current forces on the motion of forces on Floating Production Storage and Offloading (FPSO) in irregular waves. The objective of this research is to compute the motion of FPSO in irregular waves by time domain simulation including the effect of current forces. A study is made on the slowly varying oscillations of a moored single body system in a current and waves. Linear potential theory is used to describe the fluid motion, and three-dimensional source distribution techniques are applied to obtain the hydrodynamic forces and transfer function of the wave exciting forces. OCIMF (1994) data are used for estimation of the current forces. The non-linear time domain simulations have been carried out in irregular waves. Based on it, slowly varying motion responses are examined including the effect of the current forces. Several environmental conditions, such as the current angle of attack, current velocity, significant wave height and mean wave period are considered, which may significantly affect FPSO motion in surge, sway and yaw moments. It is found that the effect of current forces is quite significant when the current velocity is increased. In this simulation, while the current velocity is increased to 3.0 meter/seconds, the impact on FPSO motion is quite significant, which should be taken into consideration from the point of view of safety, failure of mooring systems, operating responses and the dynamic positioning of the FPSO
Quantum-interference-controlled three-terminal molecular transistors based on a single ring-shaped-molecule connected to graphene nanoribbon electrodes
We study all-carbon-hydrogen molecular transistors where zigzag graphene
nanoribbons play the role of three metallic electrodes connected to a
ring-shaped 18-annulene molecule. Using the nonequilibrium Green function
formalism combined with density functional theory, recently extended to
multiterminal devices, we show that the proposed nanostructures exhibit
exponentially small transmission when the source and drain electrodes are
attached in a configuration that ensures destructive interference of electron
paths around the ring. The third electrode, functioning either as an attached
infinite-impedance voltage probe or as an "air-bridge" top gate covering half
of molecular ring, introduces dephasing that brings the transistor into the
"on" state with its transmission in the latter case approaching the maximum
limit for a single conducting channel device. The current through the latter
device can also be controlled in the far-from-equilibrium regime by applying a
gate voltage.Comment: 5 pages, 4 color figures, PDFLaTeX, slightly expanded version of the
published PRL articl
Morphoanatomy Structure Variation of Digestive Organs in Relation with Feeding Strategy and Food Habits of Deep-Sea Snappers (Family Lutjanidae)
The digestive organs of four species deep-sea snappers (subfamily Etelinae, Family Lutjanidae) were investigated and compared including mouth shape as well its mouth gape, teeth structures, stomach morphology, pyloric caeca and intestine in order to investigate the existence of variability in food habits of these carnivorous fishes. The results showed that the mouth gape is an adaptation form of feeding habits, feeding strategy, as well as food size. In addition, the presence of jaw protrusion = may favour to fish feeding success. Based on regression analysis, the mouth gape is fairly correlated with the length of intestine (A. rutilans and P. multidens) and to a lesser extent with the other two species (A. virescens and P. filamentosus), indicating a weaker relationship between mouth gape versus total length than that of intestine versus total length. A generalisation of smaller proportion of the length of intestine to body length in carnivorous fishes is being questioned in this study, as an opposite result was found in P. filamentosus with a support evidence from herbivorous freshwater spotted barb (Puntius binotatus). It is suggested that the larger number in pyloric caeca of P. filamentosus is a compensatory mechanism in food digestion
Associated Factors with Social ASKES Participant Satisfaction in Family Practice Physician PT. ASKES (Limited) in Kuantan Singingi Regency
Figures Social Askes visits to health services Family Physicians PT. Health insurance (Persero) in Kuantan District Sengingi in 2010 decreased which begs the question and find the cause of the decline Askes visits to health care in the family doctor. The purpose of this study was to determine the factors associated with satisfaction in the Social Askes family doctor services in PT. Askses (Persero) in Kuantan District Sengingi. This research is quantitative analytic cross sectional design. Subjects in this study were 97 participants social Askes. Collecting data using questionnaires with the analyzed variables Administrative Services, Medical Services, and Infrastructure in Family Doctor. Statistical tests using Chi square test with p values significancy (p-value) <0.05. The results showed no relationship Administrative Services, Medical pelayana, and Infrastructures in the Family Physician satisfaction Askes Social PT. Health insurance (Persero) in Kuantan District Singingi. Doctors advised the family in order to maintain and improve the system of administrative services, medical services and infrastructure in order to improve the quality of care and satisfaction Askes social, family doctors can provide care that is promotive and preventive, PT. Health insurance (Persero) Regency Kuantan Sengingi more family doctors to promote the existence of the Social Aske
COMPULSORY LICENSING PRICE CONTROLS AND ACCESS TO PATENTED FOREIGN PRODUCTS
www.vanderbilt.edu/econ Compulsory licensing, price controls, and access to patented foreign product
- …