scholarly journals STRUCTURE AND COMPOSITENESS OF HADRON RESONANCES

2013 ◽  
Vol 28 (29) ◽  
pp. 1330045 ◽  
Author(s):  
TETSUO HYODO
Keyword(s):  
Decay Width ◽  
Degrees Of Freedom ◽  
Classification Scheme ◽  
Hadron Structure ◽  
Recent Developments ◽  
Multiquark States ◽  
Exotic Hadrons ◽  
Conventional Picture

The structure of the hadron resonances attracts much attention, in association with the recent observations of various exotic hadrons which do not fit well in the conventional picture. These findings urge us to consider various new configurations such as the multiquark states and the hadronic molecules. However, it is a subtle problem to define a proper classification scheme for the hadron structure, and the nonzero decay width of the hadron resonances makes the analysis complicated. In this paper, we summarize the recent developments in the studies of the structure of the hadron resonances, focusing on the notion of the compositeness in terms of the hadronic degrees of freedom.

Recent developments on the morphology of the brachyuran foregut ossicles and gastric teeth

Zootaxa ◽  
2010 ◽  
Vol 2510 (1) ◽  
pp. 1 ◽  
Author(s):  
ANDREAS BRÖSING
Keyword(s):  
Classification Scheme ◽  
Staining Method ◽  
Recent Developments ◽  
Brachyuran Crabs

The complexity of the brachyuran foregut, in particular the foregut ossicles and gastric teeth, were investigated and documented in 66 brachyuran taxa employing a new staining method. The brachyuran groundpattern is proposed to consist of 41 ossicles. Most of the ossicles show a very conservative pattern with only a few variations. A previous classification scheme proposed by Nauck (1880) with the grouping of the recent brachyuran crabs in Heterodontea and Cyclodontea is not supported by this study. The study also shows that the Heterodontea and Cyclodontea are not monophyletic.

scholarly journals The $$\varOmega _{ c}$$-puzzle solved by means of quark model predictions

2019 ◽  
Vol 79 (12) ◽  
Author(s):  
E. Santopinto ◽  
A. Giachino ◽  
J. Ferretti ◽  
H. García-Tecocoatzi ◽  
M. A. Bedolla ◽  
...  
Keyword(s):  
Harmonic Oscillator ◽  
Quark Model ◽  
Quantum Number ◽  
Decay Width ◽  
Degrees Of Freedom ◽  
Model Predictions ◽  
Suitable Environment ◽  
Important Milestone

AbstractThe observation of five $$\varOmega _c $$Ωc= ssc states by LHCb [Aaij et al. Phys. Rev. Lett. 118, 182001 (2017)] and the confirmation of four of them by Belle [Yelton et al. Phys. Rev. D 97, 051102 (2018)], may represent an important milestone in our understanding of the quark organization inside hadrons. By providing results for the spectrum of $$\varOmega _{ c}$$Ωc baryons and predictions for their $$\varXi _{ c}^{+}K^{-}$$Ξc+K- and $$\varXi _{ c}'^{+}K^{-}$$Ξc′+K- decay amplitudes within an harmonic oscillator based model, we suggest a possible solution to the $$\varOmega _{c}$$Ωc quantum number puzzle and we extend our mass and decay width predictions to the $$\varOmega _b$$Ωb states. Finally, we discuss why the set of $$\varOmega _{ c(b)}$$Ωc(b) baryons is the most suitable environment to test the validity of three-quark and quark–diquark effective degrees of freedom.

scholarly journals Recent Developments on Modeling for a 3-DOF Micro-Hand Based on AI Methods

Micromachines ◽  
2020 ◽  
Vol 11 (9) ◽  
pp. 792
Author(s):  
Shuhei Kawamura ◽  
Mingcong Deng
Keyword(s):  
Artificial Intelligence ◽  
Degrees Of Freedom ◽  
Air Pressure ◽  
Support Vector ◽  
Input Output ◽  
Soft Actuator ◽  
Flexible Materials ◽  
Recent Developments ◽  
Soft Actuators ◽  
Three Degrees Of Freedom

Recently, soft actuators have been expected to have many applications in various fields. Most of the actuators are composed of flexible materials and driven by air pressure. The 3-DOF micro-hand, which is a kind of soft actuator, can realize a three degrees of freedom motion by changing the applied air pressure pattern. However, the input–output relation is nonlinear and complicated. In previous research, a model of the micro-hand was proposed, but an error between the model and the experimental results was large. In this paper, modeling for the micro-hand is proposed by using multi-output support vector regression (MSVR) and ant colony optimization (ACO), which is one of the artificial intelligence (AI) methods. MSVR estimates the input–output relation of the micro-hand. ACO optimizes the parameters of the MSVR model.

Control of Machine Tools and Robots

1986 ◽  
Vol 39 (9) ◽  
pp. 1331-1338 ◽  
Author(s):  
Yoram Koren
Keyword(s):  
Machine Tools ◽  
Degrees Of Freedom ◽  
Feedback Loop ◽  
Control Structure ◽  
Industrial Robots ◽  
Cnc Machine Tools ◽  
Cnc Machine ◽  
Control Schemes ◽  
Position Feedback ◽  
Recent Developments

The principal control structure of CNC machine tools and industrial robots is similar, since in both systems each axis of motion is separately controlled with a position feedback loop. Nevertheless, the control of robots is more complex, since they include more degrees of freedom and the motion of each joint is not independent of other joints. This paper compares the conventional control schemes of both systems, and summarizes recent developments in adaptive control of machine tools and robots.

Analyzing Octopus Movements Using Three-Dimensional Reconstruction

2007 ◽  
Vol 98 (3) ◽  
pp. 1775-1790 ◽  
Author(s):  
Yoram Yekutieli ◽  
Rea Mitelman ◽  
Binyamin Hochner ◽  
Tamar Flash
Keyword(s):  
Degrees Of Freedom ◽  
Three Dimensional ◽  
Arm Movements ◽  
Light Refraction ◽  
Video Cameras ◽  
Electrophysiological Recordings ◽  
Custom Made ◽  
Dimensional Reconstruction ◽  
Recent Developments ◽  
Computerized System

Octopus arms, as well as other muscular hydrostats, are characterized by a very large number of degrees of freedom and a rich motion repertoire. Over the years, several attempts have been made to elucidate the interplay between the biomechanics of these organs and their control systems. Recent developments in electrophysiological recordings from both the arms and brains of behaving octopuses mark significant progress in this direction. The next stage is relating these recordings to the octopus arm movements, which requires an accurate and reliable method of movement description and analysis. Here we describe a semiautomatic computerized system for 3D reconstruction of an octopus arm during motion. It consists of two digital video cameras and a PC computer running custom-made software. The system overcomes the difficulty of extracting the motion of smooth, nonrigid objects in poor viewing conditions. Some of the trouble is explained by the problem of light refraction in recording underwater motion. Here we use both experiments and simulations to analyze the refraction problem and show that accurate reconstruction is possible. We have used this system successfully to reconstruct different types of octopus arm movements, such as reaching and bend initiation movements. Our system is noninvasive and does not require attaching any artificial markers to the octopus arm. It may therefore be of more general use in reconstructing other nonrigid, elongated objects in motion.

scholarly journals PERIODIC ORBIT THEORY INCLUDING SPIN DEGREES OF FREEDOM

2004 ◽  
Vol 13 (01) ◽  
pp. 19-28 ◽  
Author(s):  
MATTHIAS BRACK ◽  
CHRISTIAN AMANN ◽  
MIKHAIL PLETYUKHOV ◽  
OLEG ZAITSEV
Keyword(s):  
Degrees Of Freedom ◽  
Model Systems ◽  
Periodic Orbit Theory ◽  
New Approach ◽  
Shell Effects ◽  
Fermion Systems ◽  
Recent Developments ◽  
Orbit Theory ◽  
Classical Phase Space ◽  
Spin Orbit Interactions

We summarize recent developments of the semiclassical description of shell effects in finite fermion systems with explicit inclusion of spin degrees of freedom, in particluar in the presence of spin-orbit interactions. We present a new approach that makes use of spin coherent states and a correspondingly enlarged classical phase space. Taking suitable limits, we can recover some of the earlier approaches. Applications to some model systems are presented.

scholarly journals The State of Matter in Simulations of Core-Collapse supernovae—Reflections and Recent Developments

2017 ◽  
Vol 34 ◽  
Author(s):  
Tobias Fischer ◽  
Niels-Uwe Bastian ◽  
David Blaschke ◽  
Mateusz Cierniak ◽  
Matthias Hempel ◽  
...  
Keyword(s):  
Equation Of State ◽  
Degrees Of Freedom ◽  
The State ◽  
Core Collapse ◽  
Heavy Nuclei ◽  
Isospin Asymmetry ◽  
Wide Range ◽  
Recent Developments ◽  
State Of Matter

AbstractIn this review article, we discuss selected developments regarding the role of the equation of state in simulations of core-collapse supernovae. There are no first-principle calculations of the state of matter under supernova conditions since a wide range of conditions is covered, in terms of density, temperature, and isospin asymmetry. Instead, model equation of state are commonly employed in supernova studies. These can be divided into regimes with intrinsically different degrees of freedom: heavy nuclei at low temperatures, inhomogeneous nuclear matter where light and heavy nuclei coexist together with unbound nucleons, and the transition to homogeneous matter at high densities and temperatures. In this article, we discuss each of these phases with particular view on their role in supernova simulations.

scholarly journals Heat Engines of Extraordinary Efficiency and the General Principle of their Operation

2017 ◽  
Author(s):  
Remi Cornwall
Keyword(s):  
Kinetic Theory ◽  
Degrees Of Freedom ◽  
Classification Scheme ◽  
Chemical Potential ◽  
Information Theoretic ◽  
Heat Engines ◽  
Magnetic Remanence ◽  
Maxwell Demon ◽  
Definition Of ◽  
The Right

The intention of this paper is to elucidate new types of heat engines with extraordinary efficiency, more specifically to eventually focus on the author’s research into a temporary magnetic remanence device. First we extend the definition of heat engines through a diagrammatic classification scheme and note a paradoxical non-coincidence between the Carnot, Kelvin-Planck and other forms of the 2nd Law, between sectors of the diagram. It is then seen, between the diagram sectors, how super-efficient heat engines are able to reduce the degrees of freedom resulting from change in chemical potential, over mere generation of heat; until in the right sector of the diagram, the conventional wisdom for the need of two reservoirs is refuted. A brief survey of the Maxwell Demon problem finds no problem with information theoretic constructs. Our ongoing experimental enquiry into a temporary magnetic remanence cycle using standard kinetic theory, thermodynamics and electrodynamics is presented – yet a contradiction results with the 2nd law placing it in the right sector of the classification diagram.

scholarly journals Implanted intracortical electrodes as chronic neural interfaces to the central nervous system

2015 ◽  
Author(s):  
Peter Henderson
Keyword(s):  
Immune Responses ◽  
Degrees Of Freedom ◽  
Bioactive Molecules ◽  
Neural Interfaces ◽  
Controlled Study ◽  
Mems Devices ◽  
Recent Developments ◽  
Fine Control ◽  
Intracortical Electrodes

Recent developments in neural interfaces show that it is possible to have fine control of a robotic prosthetic by interfacing with the motor cortex of the human brain. Development of long term systems for this purpose is a challenging task with many different possibilities. Intracortical implants have shown the most promise in providing enough signal selectivity and throughput for complex control systems with many degrees of freedom. Intracortical systems generally fall into two categories: MEMS devices and bundle of wire systems. While both show promise, MEMS systems have been greatly popularized due to their reproducibility. In particular, the Michigan probe and Utah microarray are often used as a base for construction of more complex intracortical systems. However, these systems still carry many downsides. Their long-term viability is questionable, with mixed results. The effects of damage from implantation are still inconclusive and immune responses remain a problem for long-term use. While there is some promising research in the use of bioactive molecules and biocompatible materials to prevent immune responses, more controlled study is needed before intracortical systems become widespread.

scholarly journals Holographic Multiquarks in the Quark-Gluon Plasma: A Review

2011 ◽  
Vol 2011 ◽  
pp. 1-40 ◽  
Author(s):  
Piyabut Burikham ◽  
Ekapong Hirunsirisawat
Keyword(s):  
Magnetic Field ◽  
Phase Diagram ◽  
Magnetic Properties ◽  
Quark Gluon Plasma ◽  
Bound States ◽  
Degrees Of Freedom ◽  
Gluon Plasma ◽  
Screening Length ◽  
Holographic Approach ◽  
Multiquark States

We review the holographic multiquark states in the deconfined quark-gluon plasma. Nuclear matter can become deconfined by extremely high temperature and/or density. In the deconfined nuclear medium, bound states with colour degrees of freedom are allowed to exist. Using holographic approach, the binding energy and the screening length of the multiquarks can be calculated. Using the deconfined Sakai-Sugimoto model, the phase diagram of the multiquark phase, the vacuum phase, and the chiral-symmetric quark-gluon plasma can be obtained. Then we review the magnetic properties of the multiquarks and their phase diagrams. The multiquark phase is compared with the pure pion gradient, the magnetized vacuum, and the chiral-symmetric quark-gluon plasma phases. For moderate temperature and sufficiently large density at a fixed magnetic field, the mixed phase of multiquark and pion gradient is the most energetically preferred phase.

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