140 research outputs found
Polarized Negative Ion Source with Multiply Sphericaly Focusing Surface Plasma Ionizer
It is proposed one universal H-/D- ion source design combining the most
advanced developments in the field of polarized ion sources to provide
high-current high-brightness ion beams with >90% polarization and improved
lifetime, reliability, and power efficiency. The new source utilizes
high-efficiency resonant charge-exchange ionization of polarized neutral atoms
by negative ions generated by cesiated surface-plasma interactions via a
multi-spherical negative ion focusing element. Multi-spherical focusing of the
negative ions strongly suppresses the parasitic generation of unpolarized H-/D-
ions. By incorporating new and novel designs for the dissociator and plasma
generator in parallel with the multi-spherical focusing the design can suppress
adsorption and depolarization of particles from the polarized beam greatly
improving performance over current concepts
Hamiltonian structures for general PDEs
We sketch out a new geometric framework to construct Hamiltonian operators
for generic, non-evolutionary partial differential equations. Examples on how
the formalism works are provided for the KdV equation, Camassa-Holm equation,
and Kupershmidt's deformation of a bi-Hamiltonian system.Comment: 12 pages; v2, v3: minor correction
Carbon Film in Radio Frequency Surface Plasma Source with Cesiation
It is assumed that persistent cesiation in the SNS RF SPS is related to
deposition of carbon film on the collar converter. The work function dependence
for graphite with alkali deposition has no minimum typical for metals and
semiconductors and the final work function is higher. For this reason, the
probability of H- secondary emission from cesiated metal and semiconductors can
be higher than from cesiated carbon films but the carbon film maintains
cesiation longer and can operate with low cesium consumption
СПОСІБ ЗЛОЧИНУ У СФЕРІ ЕКОНОМІЧНОЇ ДІЯЛЬНОСТІ ЯК СИСТЕМОУТВОРЮЮЧИЙ ЕЛЕМЕНТ КРИМІНАЛІСТИЧНОЇ ХАРАКТЕРИСТИКИ
The problem questions of criminalistic interrelations of the crime method in sphere of economic activities with other elements of criminalistic characteristic (a subject of a criminal infringement, personality of a criminal, typical traces) are studied. Depending on circumstances, key value when investigating crimes in the sphere of economic activity may have any from the specified elements of the criminalistic characterictics. The analysis of investigative and judicial practice shows that there exist correlation dependences between such structural elements of a criminalistic characteristic of crimes in the sphere of economic activity as their method, typical traces and criminal personalities because the type and the method of a crime are in a close relation with the criminal personality. But as this research and investigative practice proves, for this type of crimes the method occupies a special, leading position. It’s a system-forming element of a criminalistic characteristic which is related with the other dependences of high degree ofprobability. It’s explained by that a method is most informative, and in it (by means of it) all components of process of preparation, fulfillment and crime concealment in the sphere of economic activity are fully displayed. The crimes methods study is a source for the newest recommendations on struggle against crime. The data about this criminalistic category is used for working out tactical means and methodical recommendations about disclosure, investigation and the prevention of crimes in the sphere of economic activity and also for the organization and planning of investigation. In particular, the information about the methods of crimes is used for providing comprehensiveness, all-roundness and efficiency of investigation; for search of the persons who have committed a crime, and also for the prevention from their committing by already known methods or by such that could appear.Досліджено проблемні питання криміналістичних взаємозв’язків способу злочину у сфері економічної діяльності з іншими елементами криміналістичної характеристики. На підставі цього аналізу зроблено висновки щодо місця способу злочину в системі елементів криміналістичної характеристики злочинів у сфері економічної діяльності та значення такого підходу для модернізації й удосконалення методик розслідування
Application of TG/DSC Analysis under Variable Gas Phase Composition to Study Order-Disorder Transition in Nonstoichiometric Sr-Dy-Cobaltate
Методом термического анализа (ТГ/ДСК) в условиях постоянного и программированного
состава газовой фазы изучено влияние скорости закалки на полноту перехода кубического
разупорядоченного нестехиометрического перовскита (I) Sr(0.8)Dy(0.2)CoO(3-d) в
тетрагональную модификацию (II) с упорядоченным расположением катионов Sr/Dy
и анионных вакансий, а также взаимосвязь степени превращения I в II с количеством
мобильного кислорода и его энергетическими характеристиками. Показано, что фазовое
превращение протекает как фазовый переход первого рода, процесс образования структуры
II контролируется кинетическими факторами, а использование скоростей охлаждения
3-99 К/мин позволяет получить образцы, формально соответствующие 98-30 % превращению
I в II; при этом как количество подвижного кислорода, так и энтальпия его удаления из
образца нелинейно зависят от полноты перехода I в IIFor the first time a method of TG/DSC analysis under constant and variable gas phase composition was
applied to reveal interconnection between quenching ramp rates and degree of phase transformation
of cubic nonstoichiometric disordered perovskite (I) Sr(0.8)Dy(0.2)CoO(3-d) to tetragonal structure
(II) with ordered Sr/Dy cations and anion vacancies. It was shown that the transformation is a first
order phase transition and the ordering process is kinetically controlled. Based on the experimental
transition enthalpy it was found that a formal conversion degree of I to II was 98-30% under cooling
ramp rates 3-99 K/min. Non-linear relationship between the completeness of I-to-II transformation
and mobile oxygen characteristics (content and the enthalpy of O-removal) was demonstrate
Sensitive Search for a Permanent Muon Electric Dipole Moment
We are proposing a new method to carry out a dedicated search for a permanent
electric dipole moment (EDM) of the muon with a sensitivity at a level of
10^{-24} e cm. The experimental design exploits the strong motional electric
field sensed by relativistic particles in a magnetic storage ring. As a key
feature, a novel technique has been invented in which the g-2 precession is
compensated with radial electric field. This technique will benefit greatly
when the intense muon sources advocated by the developers of the muon storage
rings and the muon colliders become available.Comment: 16 pages, 3 figures. Submitted for publication in Proceedings of the
International Workshop on High Intensity Muon Sources (HIMUS99), KEK, Japan,
December 1-4 199
Science Requirements and Conceptual Design for a Polarized Medium Energy Electron-Ion Collider at Jefferson Lab
This report presents a brief summary of the science opportunities and program
of a polarized medium energy electron-ion collider at Jefferson Lab and a
comprehensive description of the conceptual design of such a collider based on
the CEBAF electron accelerator facility.Comment: 160 pages, ~93 figures This work was supported by the U.S. Department
of Energy, Office of Nuclear Physics, under Contract No. DE-AC05-06OR23177,
DE-AC02-06CH11357, DE-AC05-060R23177, and DESC0005823. The U.S. Government
retains a non-exclusive, paid-up, irrevocable, world-wide license to publish
or reproduce this manuscript for U.S. Government purpose
Controllability on infinite-dimensional manifolds
Following the unified approach of A. Kriegl and P.W. Michor (1997) for a
treatment of global analysis on a class of locally convex spaces known as
convenient, we give a generalization of Rashevsky-Chow's theorem for control
systems in regular connected manifolds modelled on convenient
(infinite-dimensional) locally convex spaces which are not necessarily
normable.Comment: 19 pages, 1 figur
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