324 research outputs found
Studies and application of bent crystals for beam steering at 70-GeV IHEP accelerator
This report overviews studies accomplished in the U70 proton synchrotron of
IHEP-Protvino during the recent two decades. Major attention is paid to a
routine application of bent crystals for beam extraction from the machine. It
has been confirmed experimentally that efficiency of beam extraction with a
crystal deflector of around 85% is well feasible for a proton beam with
intensity up to 1012 protons per cycle. Another trend is to use bent crystals
for halo collimation in a high energy collider. New promising options emerge
for, say, LHC and ILC based on the "volume reflection" effect, which has been
discovered recently in machine study runs at U70 of IHEP (50 GeV) and SPS of
CERN (400 GeV).Comment: 12 pages, 14 figure
Charm in cosmic rays (The long-flying component of EAS cores)
Experimental data on cosmic ray cascades with enlarged attenuation lengths
(Tien-Shan effect) are presented and analyzed in terms of charm
hadroproduction. The very first estimates of charm hadroproduction cross
sections from experimental data at high energies are confirmed and compared
with recent accelerator results.Comment: 12 pages, 8 figures, LATE
Superfluid pairing in a polarized dipolar Fermi gas
We calculate the critical temperature of a superfluid phase transition in a
polarized Fermi gas of dipolar particles. In this case the order parameter is
anisotropic and has a nontrivial energy dependence. Cooper pairs do not have a
definite value of the angular momentum and are coherent superpositions of all
odd angular momenta. Our results describe prospects for achieving the
superfluid transition in single-component gases of fermionic polar molecules.Comment: 12 pages, 2 figure
ĐąĐ”Ń ĐœĐŸĐ»ĐŸĐłĐžĐž ĐșĐŸĐŒĐżĐ»Đ”ĐșŃĐœĐŸĐłĐŸ ĐžĐœŃДллДĐșŃŃĐ°Đ»ŃĐœĐŸĐłĐŸ Đ°ĐœĐ°Đ»ĐžĐ·Đ° ĐșĐ»ĐžĐœĐžŃĐ”ŃĐșĐžŃ ĐŽĐ°ĐœĐœŃŃ
The paper presents the system for intelligent analysis of clinical information. Authors describe methods implemented in the system for clinical information retrieval, intelligent diagnostics of chronic diseases, patientâs features importance and for detection of hidden dependencies between features. Results of the experimental evaluation of these methods are also presented.Background: Healthcare facilities generate a large flow of both structured and unstructured data which contain important information about patients. Test results are usually retained as structured data but some data is retained in the form of natural language texts (medical history, the results of physical examination, and the results of other examinations, such as ultrasound, ECG or X-ray studies). Many tasks arising in clinical practice can be automated applying methods for intelligent analysis of accumulated structured array and unstructured data that leads to improvement of the healthcare quality.Aims: the creation of the complex system for intelligent data analysis in the multi-disciplinary pediatric center.Materials and methods: Authors propose methods for information extraction from clinical texts in Russian. The methods are carried out on the basis of deep linguistic analysis. They retrieve terms of diseases, symptoms, areas of the body and drugs. The methods can recognize additional attributes such as «negation» (indicates that the disease is absent), «no patient» (indicates that the disease refers to the patientâs family member, but not to the patient), «severity of illness», «disease course», «body region to which the disease refers». Authors use a set of hand-drawn templates and various techniques based on machine learning to retrieve information using a medical thesaurus. The extracted information is used to solve the problem of automatic diagnosis of chronic diseases. A machine learning method for classification of patients with similar nosology and the method for determining the most informative patientsâ features are also proposed.Results: Authors have processed anonymized health records from the pediatric center to estimate the proposed methods. The results show the applicability of the information extracted from the texts for solving practical problems. The records of patients with allergic, glomerular and rheumatic diseases were used for experimental assessment of the method of automatic diagnostic. Authors have also determined the most appropriate machine learning methods for classification of patients for each group of diseases, as well as the most informative disease signs. It has been found that using additional information extracted from clinical texts, together with structured data helps to improve the quality of diagnosis of chronic diseases. Authors have also obtained pattern combinations of signs of diseases.Conclusions: The proposed methods have been implemented in the intelligent data processing system for a multidisciplinary pediatric center. The experimental results show the availability of the system to improve the quality of pediatric healthcare. ĐĐ±ĐŸŃĐœĐŸĐČĐ°ĐœĐžĐ”. ĐДЎОŃĐžĐœŃĐșОД ŃŃŃĐ”Đ¶ĐŽĐ”ĐœĐžŃ ĐłĐ”ĐœĐ”ŃĐžŃŃŃŃ Đ±ĐŸĐ»ŃŃĐŸĐč ĐżĐŸŃĐŸĐș ĐșĐ°Đș ŃŃŃŃĐșŃŃŃĐžŃĐŸĐČĐ°ĐœĐœŃŃ
, ŃĐ°Đș Đž ĐœĐ”ŃŃŃŃĐșŃŃŃĐžŃĐŸĐČĐ°ĐœĐœŃŃ
ĐŽĐ°ĐœĐœŃŃ
, ŃĐŸĐŽĐ”ŃжаŃĐžŃ
ĐČĐ°Đ¶ĐœŃŃ ĐžĐœŃĐŸŃĐŒĐ°ŃĐžŃ ĐŸ паŃĐžĐ”ĐœŃĐ°Ń
. Đ ŃŃŃŃĐșŃŃŃĐžŃĐŸĐČĐ°ĐœĐœĐŸĐŒ ĐČОЎД, ĐșĐ°Đș ĐżŃĐ°ĐČĐžĐ»ĐŸ, Ń
ŃĐ°ĐœŃŃŃŃ ŃДзŃĐ»ŃŃĐ°ŃŃ Đ°ĐœĐ°Đ»ĐžĐ·ĐŸĐČ, ĐŸĐŽĐœĐ°ĐșĐŸ ĐżĐŸĐŽĐ°ĐČĐ»ŃŃŃДД ĐșĐŸĐ»ĐžŃĐ”ŃŃĐČĐŸ ĐŽĐ°ĐœĐœŃŃ
Ń
ŃĐ°ĐœĐžŃŃŃ ĐČ ĐœĐ”ŃŃŃŃĐșŃŃŃĐžŃĐŸĐČĐ°ĐœĐœĐŸĐč ŃĐŸŃĐŒĐ” ĐČ ĐČОЎД ŃĐ”ĐșŃŃĐŸĐČ ĐœĐ° Đ”ŃŃĐ”ŃŃĐČĐ”ĐœĐœĐŸĐŒ ŃĐ·ŃĐșĐ” (Đ°ĐœĐ°ĐŒĐœĐ”Đ·Ń, ŃДзŃĐ»ŃŃĐ°ŃŃ ĐŸŃĐŒĐŸŃŃĐŸĐČ, ĐŸĐżĐžŃĐ°ĐœĐžŃ ŃДзŃĐ»ŃŃĐ°ŃĐŸĐČ ĐŸĐ±ŃĐ»Đ”ĐŽĐŸĐČĐ°ĐœĐžĐč, ŃĐ°ĐșĐžŃ
ĐșĐ°Đș ĐŁĐĐ, ĐĐĐ, ŃĐ”ĐœŃĐłĐ”ĐœĐŸĐČŃĐșĐžŃ
ĐžŃŃĐ»Đ”ĐŽĐŸĐČĐ°ĐœĐžĐč Đž ĐŽŃ.). ĐŃĐżĐŸĐ»ŃĐ·ŃŃ ĐŒĐ”ŃĐŸĐŽŃ ĐžĐœŃДллДĐșŃŃĐ°Đ»ŃĐœĐŸĐč ĐŸĐ±ŃĐ°Đ±ĐŸŃĐșĐž ĐœĐ°ĐșĐŸĐżĐ»Đ”ĐœĐœŃŃ
ĐŒĐ°ŃŃĐžĐČĐŸĐČ ŃŃŃŃĐșŃŃŃĐžŃĐŸĐČĐ°ĐœĐœŃŃ
Đž ĐœĐ”ŃŃŃŃĐșŃŃŃĐžŃĐŸĐČĐ°ĐœĐœŃŃ
ĐŽĐ°ĐœĐœŃŃ
, ĐŒĐŸĐ¶ĐœĐŸ Đ°ĐČŃĐŸĐŒĐ°ŃОзОŃĐŸĐČĐ°ŃŃ ŃĐ”ŃĐ”ĐœĐžĐ” ĐŒĐœĐŸĐłĐžŃ
Đ·Đ°ĐŽĐ°Ń, ĐČĐŸĐ·ĐœĐžĐșĐ°ŃŃĐžŃ
ĐČ ĐșĐ»ĐžĐœĐžŃĐ”ŃĐșĐŸĐč ĐżŃĐ°ĐșŃĐžĐșĐ” Đž ĐżĐŸĐČŃŃĐžŃŃ ĐșĐ°ŃĐ”ŃŃĐČĐŸ ĐŒĐ”ĐŽĐžŃĐžĐœŃĐșĐŸĐč ĐżĐŸĐŒĐŸŃĐž.ĐŠĐ”Đ»Ń ĐžŃŃĐ»Đ”ĐŽĐŸĐČĐ°ĐœĐžŃ: ŃĐŸĐ·ĐŽĐ°ĐœĐžĐ” ĐșĐŸĐŒĐżĐ»Đ”ĐșŃĐœĐŸĐč ŃĐžŃŃĐ”ĐŒŃ ĐžĐœŃДллДĐșŃŃĐ°Đ»ŃĐœĐŸĐč ĐŸĐ±ŃĐ°Đ±ĐŸŃĐșĐž ĐŽĐ°ĐœĐœŃŃ
ĐČ ĐŒĐœĐŸĐłĐŸĐżŃĐŸŃОлŃĐœĐŸĐŒ пДЎОаŃŃĐžŃĐ”ŃĐșĐŸĐŒ ŃĐ”ĐœŃŃĐ”.ĐĐ”ŃĐŸĐŽŃ. ĐĐ·ĐČлДŃĐ”ĐœĐžĐ” ĐžĐœŃĐŸŃĐŒĐ°ŃОО Оз ĐșĐ»ĐžĐœĐžŃĐ”ŃĐșĐžŃ
ŃĐ”ĐșŃŃĐŸĐČ ĐœĐ° ŃŃŃŃĐșĐŸĐŒ ŃĐ·ŃĐșĐ” ĐŸŃŃŃĐ”ŃŃĐČĐ»ŃĐ”ŃŃŃ ĐœĐ° ĐŸŃĐœĐŸĐČĐ” ĐżĐŸĐ»ĐœĐŸĐłĐŸ Đ»ĐžĐœĐłĐČĐžŃŃĐžŃĐ”ŃĐșĐŸĐłĐŸ Đ°ĐœĐ°Đ»ĐžĐ·Đ°. ĐĐ·ĐČлДĐșĐ°ŃŃŃŃ ŃĐżĐŸĐŒĐžĐœĐ°ĐœĐžŃ Đ·Đ°Đ±ĐŸĐ»Đ”ĐČĐ°ĐœĐžĐč, ŃĐžĐŒĐżŃĐŸĐŒĐŸĐČ, ĐŸĐ±Đ»Đ°ŃŃĐ”Đč ŃДла, лДĐșĐ°ŃŃŃĐČĐ”ĐœĐœŃŃ
ĐżŃДпаŃĐ°ŃĐŸĐČ. Đ ŃĐ”ĐșŃŃĐ” ŃĐ°ĐșжД ŃĐ°ŃĐżĐŸĐ·ĐœĐ°ŃŃŃŃ Đ°ŃŃОбŃŃŃ Đ·Đ°Đ±ĐŸĐ»Đ”ĐČĐ°ĐœĐžĐč: Â«ĐŸŃŃĐžŃĐ°ĐœĐžĐ”Â» (ŃĐșĐ°Đ·ŃĐČĐ°Đ”Ń ĐœĐ° ŃĐŸ, ŃŃĐŸ Đ·Đ°Đ±ĐŸĐ»Đ”ĐČĐ°ĐœĐžĐ” ĐŸŃŃŃŃŃŃĐČŃĐ”Ń), Â«ĐœĐ” паŃĐžĐ”ĐœŃ» (ŃĐșĐ°Đ·ŃĐČĐ°Đ”Ń ĐœĐ° ŃĐŸ, ŃŃĐŸ Đ·Đ°Đ±ĐŸĐ»Đ”ĐČĐ°ĐœĐžĐ” ĐŸŃĐœĐŸŃĐžŃŃŃ ĐœĐ” Đș паŃĐžĐ”ĐœŃŃ, Đ° Đș Đ”ĐłĐŸ ŃĐŸĐŽŃŃĐČĐ”ĐœĐœĐžĐșŃ), «ŃŃжДŃŃŃ Đ·Đ°Đ±ĐŸĐ»Đ”ĐČĐ°ĐœĐžŃ», «ŃĐ”ŃĐ”ĐœĐžĐ” Đ·Đ°Đ±ĐŸĐ»Đ”ĐČĐ°ĐœĐžŃ», Â«ĐŸĐ±Đ»Đ°ŃŃŃ ŃДла, Đș ĐșĐŸŃĐŸŃĐŸĐč ĐŸŃĐœĐŸŃĐžŃŃŃ Đ·Đ°Đ±ĐŸĐ»Đ”ĐČĐ°ĐœĐžĐ”Â». ĐĐ»Ń ĐžĐ·ĐČлДŃĐ”ĐœĐžŃ ĐžĐœŃĐŸŃĐŒĐ°ŃОО ĐžŃĐżĐŸĐ»ŃĐ·ŃŃŃŃŃ ĐŒĐ”ĐŽĐžŃĐžĐœŃĐșОД ŃДзаŃŃŃŃŃ, ĐœĐ°Đ±ĐŸŃ ĐČŃŃŃĐœŃŃ ŃĐŸŃŃĐ°ĐČĐ»Đ”ĐœĐœŃŃ
ŃĐ°Đ±Đ»ĐŸĐœĐŸĐČ, Đ° ŃĐ°ĐșжД ŃазлОŃĐœŃĐ” ĐŒĐ”ŃĐŸĐŽŃ ĐœĐ° ĐŸŃĐœĐŸĐČĐ” ĐŒĐ°ŃĐžĐœĐœĐŸĐłĐŸ ĐŸĐ±ŃŃĐ”ĐœĐžŃ. ĐĐŸĐ»ŃŃĐ”ĐœĐœŃĐ” Оз ŃĐ”ĐșŃŃĐŸĐČ ĐŽĐ°ĐœĐœŃĐ” ĐžŃĐżĐŸĐ»ŃĐ·ŃŃŃŃŃ ĐŽĐ»Ń ŃĐ”ŃĐ”ĐœĐžŃ Đ·Đ°ĐŽĐ°ŃĐž Đ°ĐČŃĐŸĐŒĐ°ŃĐžŃĐ”ŃĐșĐŸĐč ĐŽĐžĐ°ĐłĐœĐŸŃŃĐžĐșĐž Ń
ŃĐŸĐœĐžŃĐ”ŃĐșĐžŃ
Đ·Đ°Đ±ĐŸĐ»Đ”ĐČĐ°ĐœĐžĐč. ĐŃĐ”ĐŽĐ»ĐŸĐ¶Đ”Đœ ĐŒĐ”ŃĐŸĐŽ ĐœĐ° ĐŸŃĐœĐŸĐČĐ” ĐŒĐ°ŃĐžĐœĐœĐŸĐłĐŸ ĐŸĐ±ŃŃĐ”ĐœĐžŃ ĐŽĐ»Ń ĐșлаŃŃĐžŃĐžĐșĐ°ŃОО паŃĐžĐ”ĐœŃĐŸĐČ ŃĐŸ ŃŃ
ĐŸĐ¶ĐžĐŒĐž ĐœĐŸĐ·ĐŸĐ»ĐŸĐłĐžŃĐŒĐž, Đ° ŃĐ°ĐșжД ĐŒĐ”ŃĐŸĐŽ ĐŽĐ»Ń ĐŸĐżŃĐ”ĐŽĐ”Đ»Đ”ĐœĐžŃ ĐœĐ°ĐžĐ±ĐŸĐ»Đ”Đ” ĐžĐœŃĐŸŃĐŒĐ°ŃĐžĐČĐœŃŃ
ĐżŃĐžĐ·ĐœĐ°ĐșĐŸĐČ.РДзŃĐ»ŃŃĐ°ŃŃ. ĐĐșŃпДŃĐžĐŒĐ”ĐœŃĐ°Đ»ŃĐœĐŸĐ” ĐžŃŃĐ»Đ”ĐŽĐŸĐČĐ°ĐœĐžĐ” ŃĐ°Đ·ŃĐ°Đ±ĐŸŃĐ°ĐœĐœŃŃ
ĐŒĐ”ŃĐŸĐŽĐŸĐČ ĐżŃĐŸĐČĐŸĐŽĐžĐ»ĐŸŃŃ ĐœĐ° ĐŸĐ±Đ”Đ·Đ»ĐžŃĐ”ĐœĐœŃŃ
ĐžŃŃĐŸŃĐžŃŃ
Đ±ĐŸĐ»Đ”Đ·ĐœĐž паŃĐžĐ”ĐœŃĐŸĐČ ĐżĐ”ĐŽĐžĐ°ŃŃĐžŃĐ”ŃĐșĐŸĐłĐŸ ŃĐ”ĐœŃŃĐ°. ĐŃĐŸĐČĐ”ĐŽĐ”ĐœĐ° ĐŸŃĐ”ĐœĐșĐ° ĐșĐ°ŃĐ”ŃŃĐČĐ° ŃĐ°Đ·ŃĐ°Đ±ĐŸŃĐ°ĐœĐœŃŃ
ĐŒĐ”ŃĐŸĐŽĐŸĐČ ĐžĐ·ĐČлДŃĐ”ĐœĐžŃ ĐžĐœŃĐŸŃĐŒĐ°ŃОО Оз ĐșĐ»ĐžĐœĐžŃĐ”ŃĐșĐžŃ
ŃĐ”ĐșŃŃĐŸĐČ ĐœĐ° ŃŃŃŃĐșĐŸĐŒ ŃĐ·ŃĐșĐ”. ĐŃĐŸĐČĐ”ĐŽĐ”ĐœĐ° ŃĐșŃпДŃĐžĐŒĐ”ĐœŃĐ°Đ»ŃĐœĐ°Ń ĐŸŃĐ”ĐœĐșĐ° ĐŒĐ”ŃĐŸĐŽĐ° Đ°ĐČŃĐŸĐŒĐ°ŃĐžŃĐ”ŃĐșĐŸĐč ĐŽĐžĐ°ĐłĐœĐŸŃŃĐžĐșĐž ĐœĐ° ĐŽĐ°ĐœĐœŃŃ
паŃĐžĐ”ĐœŃĐŸĐČ Ń Đ°Đ»Đ»Đ”ŃгОŃĐ”ŃĐșĐžĐŒĐž Đ·Đ°Đ±ĐŸĐ»Đ”ĐČĐ°ĐœĐžŃĐŒĐž Đž Đ±ĐŸĐ»Đ”Đ·ĐœŃĐŒĐž ĐŸŃĐłĐ°ĐœĐŸĐČ ĐŽŃŃ
Đ°ĐœĐžŃ, ĐœĐ”ŃŃĐŸĐ»ĐŸĐłĐžŃĐ”ŃĐșĐžĐŒĐž Đž ŃĐ”ĐČĐŒĐ°ŃĐžŃĐ”ŃĐșĐžĐŒĐž Đ·Đ°Đ±ĐŸĐ»Đ”ĐČĐ°ĐœĐžŃĐŒĐž. ĐĐżŃĐ”ĐŽĐ”Đ»Đ”ĐœŃ ĐœĐ°ĐžĐ±ĐŸĐ»Đ”Đ” ĐżĐŸĐŽŃ
ĐŸĐŽŃŃОД ĐŒĐ”ŃĐŸĐŽŃ ĐŒĐ°ŃĐžĐœĐœĐŸĐłĐŸ ĐŸĐ±ŃŃĐ”ĐœĐžŃ ĐŽĐ»Ń ĐșлаŃŃĐžŃĐžĐșĐ°ŃОО паŃĐžĐ”ĐœŃĐŸĐČ ĐŽĐ»Ń ĐșĐ°Đ¶ĐŽĐŸĐč ĐłŃŃĐżĐżŃ Đ·Đ°Đ±ĐŸĐ»Đ”ĐČĐ°ĐœĐžĐč, Đ° ŃĐ°ĐșжД ĐœĐ°ĐžĐ±ĐŸĐ»Đ”Đ” ĐžĐœŃĐŸŃĐŒĐ°ŃĐžĐČĐœŃĐ” ĐżŃĐžĐ·ĐœĐ°ĐșĐž. ĐŃĐżĐŸĐ»ŃĐ·ĐŸĐČĐ°ĐœĐžĐ” ĐŽĐ°ĐœĐœŃŃ
, ОзĐČлДŃĐ”ĐœĐœŃŃ
Оз ĐșĐ»ĐžĐœĐžŃĐ”ŃĐșĐžŃ
ŃĐ”ĐșŃŃĐŸĐČ ŃĐŸĐČĐŒĐ”ŃŃĐœĐŸ ŃĐŸ ŃŃŃŃĐșŃŃŃĐžŃĐŸĐČĐ°ĐœĐœŃĐŒĐž ĐŽĐ°ĐœĐœŃĐŒĐž, ĐżĐŸĐ·ĐČĐŸĐ»ĐžĐ»ĐŸ ĐżĐŸĐČŃŃĐžŃŃ ĐșĐ°ŃĐ”ŃŃĐČĐŸ ĐŽĐžĐ°ĐłĐœĐŸŃŃĐžĐșĐž Ń
ŃĐŸĐœĐžŃĐ”ŃĐșĐžŃ
Đ·Đ°Đ±ĐŸĐ»Đ”ĐČĐ°ĐœĐžĐč ĐżĐŸ ŃŃĐ°ĐČĐœĐ”ĐœĐžŃ Ń ĐžŃĐżĐŸĐ»ŃĐ·ĐŸĐČĐ°ĐœĐžĐ”ĐŒ лОŃŃ ĐŽĐŸŃŃŃĐżĐœŃŃ
ŃŃŃŃĐșŃŃŃĐžŃĐŸĐČĐ°ĐœĐœŃŃ
ĐŽĐ°ĐœĐœŃŃ
. ĐĐŸĐ»ŃŃĐ”ĐœŃ ŃĐ°ĐșжД ŃĐ°Đ±Đ»ĐŸĐœĐœŃĐ” ĐșĐŸĐŒĐ±ĐžĐœĐ°ŃОО ĐżŃĐžĐ·ĐœĐ°ĐșĐŸĐČ Đ·Đ°Đ±ĐŸĐ»Đ”ĐČĐ°ĐœĐžĐč.ĐĐ°ĐșĐ»ŃŃĐ”ĐœĐžĐ”. Đ Đ°Đ·ŃĐ°Đ±ĐŸŃĐ°ĐœĐœŃĐ” ĐŒĐ”ŃĐŸĐŽŃ Đ±ŃлО ŃĐ”Đ°Đ»ĐžĐ·ĐŸĐČĐ°ĐœŃ ĐČ ŃĐžŃŃĐ”ĐŒĐ” ĐžĐœŃДллДĐșŃŃĐ°Đ»ŃĐœĐŸĐč ĐŸĐ±ŃĐ°Đ±ĐŸŃĐșĐž ĐŽĐ°ĐœĐœŃŃ
ĐČ ĐŒĐœĐŸĐłĐŸĐżŃĐŸŃОлŃĐœĐŸĐŒ пДЎОаŃŃĐžŃĐ”ŃĐșĐŸĐŒ ŃĐ”ĐœŃŃĐ”. ĐŃĐŸĐČĐ”ĐŽĐ”ĐœĐœŃĐ” ĐžŃŃĐ»Đ”ĐŽĐŸĐČĐ°ĐœĐžŃ ŃĐČОЎДŃДлŃŃŃĐČŃŃŃ ĐŸ пДŃŃпДĐșŃĐžĐČĐœĐŸŃŃĐž ĐžŃĐżĐŸĐ»ŃĐ·ĐŸĐČĐ°ĐœĐžŃ ŃĐžŃŃĐ”ĐŒŃ ĐŽĐ»Ń ĐżĐŸĐČŃŃĐ”ĐœĐžŃ ĐșĐ°ŃĐ”ŃŃĐČĐ° ĐŒĐ”ĐŽĐžŃĐžĐœŃĐșĐŸĐč ĐżĐŸĐŒĐŸŃĐž паŃĐžĐ”ĐœŃĐ°ĐŒ ĐŽĐ”ŃŃĐșĐŸĐč ĐČĐŸĐ·ŃĐ°ŃŃĐœĐŸĐč ĐșĐ°ŃĐ”ĐłĐŸŃОО
Evaporation and Condensation of Clusters
Influence of surrounding matter on the properties of clusters is considered
by an approach combining the methods of statistical and quantum mechanics. A
cluster is treated as a bound N-particle system and surrounding matter as
thermostat. It is shown that, despite arbitrary strong interactions between
particles, cluster energy can be calculated by using the controlled
perturbation theory. The accuracy of the latter is found to be much higher than
that of the quasiclassical approximation. Spectral distribution is obtained by
minimizing conditional entropy. Increasing the thermostat temperature leads to
the depletion of bound states. The characteristic temperature when bound states
become essentially depleated defines the temperature of cluster evaporation.
The inverse process of lowering the thermostate temperature, yielding the
filling of bound states, corresponds to cluster condensation.Comment: 1 file, 15 pages, RevTex, 4 table
Proton Extraction from IHEP Accelerator Using Bent Crystals
IHEP Protvino has pioneered the wide practical use of bent crystals as
optical elements in high-energy beams for beam extraction and deflection on
permanent basis since 1989. In the course of IHEP experiments, crystal
channeling has been developed into efficient instrument for particle steering
at accelerators, working in predictable, reliable manner with beams of very
high intensity over years. Crystal systems extract 70 GeV protons from IHEP
main ring with efficiency of 85% at intensity of 1.E12, basing on multi-pass
mechanism of channeling proposed theoretically and realised experimentally at
IHEP. Today, six locations on the IHEP 70-GeV main ring of the accelerator
facility are equipped by crystal extraction systems, serving mostly for routine
applications rather than for research and allowing a simultaneous run of
several particle physics experiments, thus significantly enriching the IHEP
physics program. The long successful history of large-scale crystal
exploitation at IHEP should help to incorporate channeling crystals into
accelerator systems worldwide in order to create unique systems for beam
delivery. We report recent results from the research and exploitation of
crystal extraction systems at IHEP.Comment: Invited talk at the International workshop "Relativistic Channeling
and Related Coherent Phenomena", Frascati (Rome) 23-26 March 200
Dimers, Effective Interactions, and Pauli Blocking Effects in a Bilayer of Cold Fermionic Polar Molecules
We consider a bilayer setup with two parallel planes of cold fermionic polar
molecules when the dipole moments are oriented perpendicular to the planes. The
binding energy of two-body states with one polar molecule in each layer is
determined and compared to various analytic approximation schemes in both
coordinate- and momentum-space. The effective interaction of two bound dimers
is obtained by integrating out the internal dimer bound state wave function and
its robustness under analytical approximations is studied. Furthermore, we
consider the effect of the background of other fermions on the dimer state
through Pauli blocking, and discuss implications for the zero-temperature
many-body phase diagram of this experimentally realizable system.Comment: 18 pages, 10 figures, accepted versio
Double volume reflection of a proton beam by a sequence of two bent crystals
The doubling of the angle of beam deflection due to volume reflection of protons by a sequence of two bent silicon crystals was experimentally observed at the 400 GeV proton beam of the CERN SPS. A similar sequence of short bent crystals can be used as an efficient primary collimator for the Large Hadron Collider
Measurement of Leading Proton and Neutron Production in Deep Inelastic Scattering at HERA
Deep--inelastic scattering events with a leading baryon have been detected by
the H1 experiment at HERA using a forward proton spectrometer and a forward
neutron calorimeter. Semi--inclusive cross sections have been measured in the
kinematic region 2 <= Q^2 <= 50 GeV^2, 6.10^-5 <= x <= 6.10^-3 and baryon p_T
<= MeV, for events with a final state proton with energy 580 <= E' <= 740 GeV,
or a neutron with energy E' >= 160 GeV. The measurements are used to test
production models and factorization hypotheses. A Regge model of leading baryon
production which consists of pion, pomeron and secondary reggeon exchanges
gives an acceptable description of both semi-inclusive cross sections in the
region 0.7 <= E'/E_p <= 0.9, where E_p is the proton beam energy. The leading
neutron data are used to estimate for the first time the structure function of
the pion at small Bjorken--x.Comment: 30 pages, 9 figures, 2 tables, submitted to Eur. Phys.
Measurement of the polarisation of W bosons produced with large transverse momentum in pp collisions at sqrt(s) = 7 TeV with the ATLAS experiment
This paper describes an analysis of the angular distribution of W->enu and
W->munu decays, using data from pp collisions at sqrt(s) = 7 TeV recorded with
the ATLAS detector at the LHC in 2010, corresponding to an integrated
luminosity of about 35 pb^-1. Using the decay lepton transverse momentum and
the missing transverse energy, the W decay angular distribution projected onto
the transverse plane is obtained and analysed in terms of helicity fractions
f0, fL and fR over two ranges of W transverse momentum (ptw): 35 < ptw < 50 GeV
and ptw > 50 GeV. Good agreement is found with theoretical predictions. For ptw
> 50 GeV, the values of f0 and fL-fR, averaged over charge and lepton flavour,
are measured to be : f0 = 0.127 +/- 0.030 +/- 0.108 and fL-fR = 0.252 +/- 0.017
+/- 0.030, where the first uncertainties are statistical, and the second
include all systematic effects.Comment: 19 pages plus author list (34 pages total), 9 figures, 11 tables,
revised author list, matches European Journal of Physics C versio
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