576 research outputs found
DETERMINATION OF OPTIMIZATION WAYS OF RE-PROTHESIS USING VARIOUS SCHEMES GNATHOLOGICAL SUPPORT OF PATIENTS AT THE PREPARATORY STAGE TO THE ORTHOPEDIC CORRECTION OF PATIENTS WITH OCCLUSIVE IATROGENIC DISORDERS OF TOOTH-JAW APPARATUS
We brought to the light that one of the the most controversial issues is the moment of adaptation to reconstructive procedures. Often it becomes unclear which and in which order to use medical diagnostic equipment, to training for fixed prosthetic stages. Our studies make it possible to predict not only the treatment time, but the amount of occlusal adjustment in conjunction with the reconstruction of the position of the mandible.One of the most debated issues is the time of adaptation to reconstructive manipulation. Often it becomes unclear how and in what order medical diagnostic equipment should be used in the preparatory stages of the stationary prosthetics. Our studies make it possible to predict not only the treatment time, and the amount of occlusal adjustment in conjunction with the reconstruction of the lower jaw. Keywords: tooth-jaw apparatus, temporomandibular joint, violation functional occlusion, dental surgery, medical diagnostic devices, muscle disorders, adaptation, occlusal splint, occlusal adjustment, chewing muscles, provisional design
The origin of paramagnetic magnetization in field-cooled YBa2Cu3O7 films
Temperature dependences of the magnetic moment have been measured in
YBa_2Cu_3O_{7-\delta} thin films over a wide magnetic field range (5 <= H <=
10^4 Oe). In these films a paramagnetic signal known as the paramagnetic
Meissner effect has been observed. The experimental data in the films, which
have strong pinning and high critical current densities (J_c ~ 2 \times 10^6
A/cm^2 at 77 K), are quantitatively shown to be highly consistent with the
theoretical model proposed by Koshelev and Larkin [Phys. Rev. B 52, 13559
(1995)]. This finding indicates that the origin of the paramagnetic effect is
ultimately associated with nucleation and inhomogeneous spatial redistribution
of magnetic vortices in a sample which is cooled down in a magnetic field. It
is also shown that the distribution of vortices is extremely sensitive to the
interplay of film properties and the real experimental conditions of the
measurements.Comment: RevTex, 8 figure
Đ€ŃĐœĐșŃŃĐŸĐœĐ°Đ»ŃĐœĐžĐč ŃŃĐ°Đœ ĐŒâŃĐ·ŃĐČ Đ·ŃĐ±ĐŸŃĐ”Đ»Đ”ĐżĐœĐŸĐłĐŸ апаŃĐ°ŃŃ ĐŽĐŸ ŃĐ° ĐżŃŃĐ»Ń Đ»ŃĐșŃĐČĐ°ĐœĐœŃ ĐŽŃŃĐ”Đč Đ· Đ°ĐœĐŸĐŒĐ°Đ»ŃŃĐŒĐž ĐżŃĐžĐșŃŃŃ ŃĐ° ĐŒĐŸĐČĐ»Đ”ĐœĐœŃĐČĐžĐŒĐž ĐżĐŸŃŃŃĐ”ĐœĐœŃĐŒĐž
During the examination of orthodontic patients, children with speech disorders were found. The myodynamic balance of antagonistic muscles and synergistic muscles is the relative stability of masticatory and mimic muscles, which for a long time persists without noticeable oscillations, contributes to the relatively stable state of dentoalveolar apparatus.
The aim of the study â to determine the functional status of muscles of the dentoalveolar apparatus before and after treatment of children with anomalies of bite and speech disorders.
Materials and Methods. To achieve study objectives for treatment we selected 44 patients with severe orthodontic pathology and speech disorders, with normal hearing and intellect. The method of a total (surface) electromyography was used to determine and analyze the indices of bioelectric activity of the muscles.
Results and Discussion. There was normalization of parameters of bioelectric activity, decrease of parafunctional manifestations in muscles and decrease of the frequency of outbreaks of spontaneous activity of muscles at rest; normalization of the average amplitude of biopotentials in the state of activity, absence of fragmentation, improvement of synchronization and coordination of contractions of examined muscles in all pathologies of dental occlusion after the treatment.
Conclusions. The orthodontic treatment performed provided the restoration of the neuromuscular balance of the dentoalveolar apparatus of patients with various dental occlusion pathologies, which has a beneficial effect on the correction of speech disorders.ĐŃĐž ĐŸĐ±ŃĐ»Đ”ĐŽĐŸĐČĐ°ĐœĐžĐž ĐŸŃŃĐŸĐŽĐŸĐœŃĐžŃĐ”ŃĐșĐžŃ
паŃĐžĐ”ĐœŃĐŸĐČ Đ±ŃлО ĐŽĐ”ŃĐž Ń ŃĐ”ŃĐ”ĐČŃĐŒĐž ĐœĐ°ŃŃŃĐ”ĐœĐžŃĐŒĐž. ĐĐžĐŸĐŽĐžĐœĐ°ĐŒĐžŃĐ”ŃĐșĐŸĐ” ŃĐ°ĐČĐœĐŸĐČĐ”ŃОД ĐŒŃŃŃ-Đ°ĐœŃĐ°ĐłĐŸĐœĐžŃŃĐŸĐČ Đž ŃĐžĐœĐ”ŃгОŃŃĐŸĐČ â ŃŃĐŸ ĐŸŃĐœĐŸŃĐžŃДлŃĐœĐ°Ń ŃŃŃĐŸĐčŃĐžĐČĐŸŃŃŃ Đ¶Đ”ĐČĐ°ŃДлŃĐœŃŃ
Đž ĐŒĐžĐŒĐžŃĐ”ŃĐșĐžŃ
ĐŒŃŃŃ, ĐșĐŸŃĐŸŃĐ°Ń ĐČ ŃĐ”ŃĐ”ĐœĐžĐž ЎлОŃДлŃĐœĐŸĐłĐŸ ĐČŃĐ”ĐŒĐ”ĐœĐž ŃĐŸŃ
ŃĐ°ĐœŃĐ”ŃŃŃ Đ±Đ”Đ· Đ·Đ°ĐŒĐ”ŃĐœŃŃ
ĐžĐ·ĐŒĐ”ĐœĐ”ĐœĐžĐč, ŃĐżĐŸŃĐŸĐ±ŃŃĐČŃĐ”Ń ĐŸŃĐœĐŸŃĐžŃДлŃĐœĐŸĐč ŃŃабОлŃĐœĐŸŃŃĐž Đ·ŃĐ±ĐŸŃДлŃŃŃĐœĐŸĐłĐŸ аппаŃĐ°ŃĐ°.
ĐŠĐ”Đ»Ń ĐžŃŃĐ»Đ”ĐŽĐŸĐČĐ°ĐœĐžŃ â ĐŸĐżŃДЎДлОŃŃ ŃŃĐœĐșŃĐžĐŸĐœĐ°Đ»ŃĐœĐŸĐ” ŃĐŸŃŃĐŸŃĐœĐžĐ” ĐŒŃŃŃ Đ·ŃĐ±ĐŸŃДлŃŃŃĐœĐŸĐłĐŸ аппаŃĐ°ŃĐ° ĐŽĐŸ Đž ĐżĐŸŃлД лДŃĐ”ĐœĐžŃ ĐŽĐ”ŃĐ”Đč Ń Đ°ĐœĐŸĐŒĐ°Đ»ĐžŃĐŒĐž ĐżŃĐžĐșŃŃĐ° Đž ŃĐ”ŃĐ”ĐČŃĐŒĐž ĐœĐ°ŃŃŃĐ”ĐœĐžŃĐŒĐž.
ĐĐ°ŃĐ”ŃĐžĐ°Đ»Ń Đž ĐŒĐ”ŃĐŸĐŽŃ. ĐĐ»Ń ĐŽĐŸŃŃĐžĐ¶Đ”ĐœĐžŃ ĐżĐŸŃŃĐ°ĐČĐ»Đ”ĐœĐœĐŸĐč ŃДлО бŃĐ»ĐŸ ĐżŃĐžĐœŃŃĐŸ ĐœĐ° лДŃĐ”ĐœĐžĐ” 44 паŃĐžĐ”ĐœŃĐ° Ń ĐČŃŃĐ°Đ¶Đ”ĐœĐœĐŸĐč ĐŸŃŃĐŸĐŽĐŸĐœŃĐžŃĐ”ŃĐșĐŸĐč паŃĐŸĐ»ĐŸĐłĐžĐ”Đč Đž ŃĐ”ŃĐ”ĐČŃĐŒĐž ĐœĐ°ŃŃŃĐ”ĐœĐžŃĐŒĐž Ń ĐœĐŸŃĐŒĐ°Đ»ŃĐœŃĐŒ ŃĐ»ŃŃ
ĐŸĐŒ Đž ĐžĐœŃДллДĐșŃĐŸĐŒ. ĐĐ»Ń ĐŸĐżŃĐ”ĐŽĐ”Đ»Đ”ĐœĐžŃ Đž Đ°ĐœĐ°Đ»ĐžĐ·Đ° ĐżĐŸĐșĐ°Đ·Đ°ŃДлДĐč Đ±ĐžĐŸŃлДĐșŃŃĐžŃĐ”ŃĐșĐŸĐč Đ°ĐșŃĐžĐČĐœĐŸŃŃĐž ĐŒŃŃŃ ĐžŃĐżĐŸĐ»ŃĐ·ĐŸĐČĐ°Đœ ĐŒĐ”ŃĐŸĐŽ ŃŃĐŒĐŒĐ°ŃĐœĐŸĐč (ĐżĐŸĐČĐ”ŃŃ
ĐœĐŸŃŃĐœĐŸĐč) ŃлДĐșŃŃĐŸĐŒĐžĐŸĐłŃĐ°ŃОО.
РДзŃĐ»ŃŃĐ°ŃŃ ĐžŃŃĐ»Đ”ĐŽĐŸĐČĐ°ĐœĐžĐč Đž ĐžŃ
ĐŸĐ±ŃŃĐ¶ĐŽĐ”ĐœĐžĐ”. ĐĐŸŃлД ĐżŃĐŸĐČДЎŃĐœĐœĐŸĐłĐŸ лДŃĐ”ĐœĐžŃ ĐœĐ°Đ±Đ»ŃЎалО ĐœĐŸŃĐŒĐ°Đ»ĐžĐ·Đ°ŃĐžŃ ĐżĐŸĐșĐ°Đ·Đ°ŃДлДĐč Đ±ĐžĐŸŃлДĐșŃŃĐžŃĐ”ŃĐșĐŸĐč Đ°ĐșŃĐžĐČĐœĐŸŃŃĐž, ŃĐŒĐ”ĐœŃŃĐ”ĐœĐžĐ” паŃĐ°ŃŃĐœĐșŃĐžĐŸĐœĐ°Đ»ŃĐœĐžŃ
ĐżŃĐŸŃĐČĐ»Đ”ĐœĐžĐč ĐČ ĐŒŃŃŃĐ°Ń
Đž ŃĐ°ŃŃĐŸŃŃ ĐČŃĐżŃŃĐ”Đș ŃĐżĐŸĐœŃĐ°ĐœĐœĐŸĐč Đ°ĐșŃĐžĐČĐœĐŸŃŃĐž ĐŒŃŃŃ ĐČ ŃĐŸŃŃĐŸŃĐœĐžĐž ĐżĐŸĐșĐŸŃ, ĐœĐŸŃĐŒĐ°Đ»ĐžĐ·Đ°ŃĐžŃ ŃŃĐ”ĐŽĐœĐ”Đč Đ°ĐŒĐżĐ»ĐžŃŃĐŽŃ Đ±ĐžĐŸĐżĐŸŃĐ”ĐœŃĐžĐ°Đ»ĐŸĐČ ĐČ ŃĐŸŃŃĐŸŃĐœĐžĐž Đ°ĐșŃĐžĐČĐœĐŸŃŃĐž, ĐŸŃŃŃŃŃŃĐČОД ŃŃĐ°ĐłĐŒĐ”ĐœŃĐ°ŃĐžĐč, ŃĐ»ŃŃŃĐ”ĐœĐžĐ” ŃĐžĐœŃ
ŃĐŸĐœĐœĐŸŃŃĐž Đž ĐșĐŸĐŸŃĐŽĐžĐœĐ°ŃОО ŃĐŸĐșŃĐ°ŃĐ”ĐœĐžĐč ĐŸĐ±ŃĐ»Đ”ĐŽĐŸĐČĐ°ĐœĐœŃŃ
ĐŒŃŃŃ ĐżŃĐž ĐČŃĐ”Ń
паŃĐŸĐ»ĐŸĐłĐžŃŃ
ĐżŃĐžĐșŃŃĐ°.
ĐŃĐČĐŸĐŽŃ. ĐŃĐŸĐČДЎŃĐœĐœĐŸĐ” ĐŸŃŃĐŸĐŽĐŸĐœŃĐžŃĐ”ŃĐșĐŸĐ” лДŃĐ”ĐœĐžĐ” ĐŸĐ±Đ”ŃпДŃĐžĐ»ĐŸ ĐČĐŸŃŃŃĐ°ĐœĐŸĐČĐ»Đ”ĐœĐžĐ” ĐœĐ”ĐčŃĐŸĐŒŃŃĐ”ŃĐœĐŸĐłĐŸ Đ±Đ°Đ»Đ°ĐœŃĐ° Đ·ŃĐ±ĐŸŃДлŃŃŃĐœĐŸĐłĐŸ аппаŃĐ°ŃĐ° паŃĐžĐ”ĐœŃĐŸĐČ Ń ŃазлОŃĐœŃĐŒĐž паŃĐŸĐ»ĐŸĐłĐžŃĐŒĐž ĐżŃĐžĐșŃŃĐ°, ŃŃĐŸ ĐžĐŒĐ”Đ”Ń Đ±Đ»Đ°ĐłĐŸĐżŃĐžŃŃĐœĐŸĐ” ĐČĐŸĐ·ĐŽĐ”ĐčŃŃĐČОД ĐœĐ° ĐșĐŸŃŃĐ”ĐșŃĐžŃ ŃĐ”ŃĐ”ĐČŃŃ
ĐœĐ°ŃŃŃĐ”ĐœĐžĐč.ĐŃĐŽ ŃĐ°Ń ĐŸĐ±ŃŃĐ”Đ¶Đ”ĐœĐœŃ ĐŸŃŃĐŸĐŽĐŸĐœŃĐžŃĐœĐžŃ
паŃŃŃĐœŃŃĐČ Đ±ŃлО ĐŽŃŃĐž Đ· ĐŒĐŸĐČĐ»Đ”ĐœĐœŃĐČĐžĐŒĐž ĐżĐŸŃŃŃĐ”ĐœĐœŃĐŒĐž. ĐŃĐŸĐŽĐžĐœĐ°ĐŒŃŃĐœĐ° ŃŃĐČĐœĐŸĐČага ĐŒâŃĐ·ŃĐČ-Đ°ĐœŃĐ°ĐłĐŸĐœŃŃŃŃĐČ ŃĐ° ŃĐžĐœĐ”ŃĐłŃŃŃŃĐČ â ŃĐ” ĐČŃĐŽĐœĐŸŃĐœĐ° ŃŃŃĐčĐșŃŃŃŃ Đ¶ŃĐČĐ°Đ»ŃĐœĐžŃ
ŃĐ° ĐŒŃĐŒŃŃĐœĐžŃ
ĐŒâŃĐ·ŃĐČ, ŃĐŸ ĐżŃĐŸŃŃĐłĐŸĐŒ ŃŃĐžĐČĐ°Đ»ĐŸĐłĐŸ ŃĐ°ŃŃ Đ·Đ±Đ”ŃŃгаŃŃŃŃŃ Đ±Đ”Đ· ĐżĐŸĐŒŃŃĐœĐžŃ
ĐșĐŸĐ»ĐžĐČĐ°ĐœŃ, ŃĐżŃĐžŃŃ ĐČŃĐŽĐœĐŸŃĐœĐŸ ŃŃабŃĐ»ŃĐœĐŸĐłĐŸ ŃŃĐ°ĐœŃ Đ·ŃĐ±ĐŸŃĐ”Đ»Đ”ĐżĐœĐŸĐłĐŸ апаŃĐ°ŃŃ.
ĐĐ”ŃĐ° ĐŽĐŸŃĐ»ŃĐŽĐ¶Đ”ĐœĐœŃ â ĐČĐžĐ·ĐœĐ°ŃĐžŃĐž ŃŃĐœĐșŃŃĐŸĐœĐ°Đ»ŃĐœĐžĐč ŃŃĐ°Đœ ĐŒâŃĐ·ŃĐČ Đ·ŃĐ±ĐŸŃĐ”Đ»Đ”ĐżĐœĐŸĐłĐŸ апаŃĐ°ŃŃ ĐŽĐŸ ŃĐ° ĐżŃŃĐ»Ń Đ»ŃĐșŃĐČĐ°ĐœĐœŃ ĐŽŃŃĐ”Đč Đ· Đ°ĐœĐŸĐŒĐ°Đ»ŃŃĐŒĐž ĐżŃĐžĐșŃŃŃ ŃĐ° ĐŒĐŸĐČĐ»Đ”ĐœĐœŃĐČĐžĐŒĐž ĐżĐŸŃŃŃĐ”ĐœĐœŃĐŒĐž.
ĐĐ°ŃĐ”ŃŃалО Ń ĐŒĐ”ŃĐŸĐŽĐž. ĐĐ»Ń ĐŽĐŸŃŃĐłĐœĐ”ĐœĐœŃ ĐżĐŸŃŃĐ°ĐČĐ»Đ”ĐœĐŸŃ ĐŒĐ”ŃĐž бŃĐ»ĐŸ ĐżŃĐžĐčĐœŃŃĐŸ ĐœĐ° Đ»ŃĐșŃĐČĐ°ĐœĐœŃ 44 паŃŃŃĐœŃĐž Đ· ĐČĐžŃĐ°Đ¶Đ”ĐœĐŸŃ ĐŸŃŃĐŸĐŽĐŸĐœŃĐžŃĐœĐŸŃ ĐżĐ°ŃĐŸĐ»ĐŸĐłŃŃŃ ŃĐ° ĐŒĐŸĐČĐ»Đ”ĐœĐœŃĐČĐžĐŒĐž ĐżĐŸŃŃŃĐ”ĐœĐœŃĐŒĐž ŃĐ· ĐœĐŸŃĐŒĐ°Đ»ŃĐœĐžĐŒ ŃĐ»ŃŃ
ĐŸĐŒ ŃĐ° ŃĐœŃДлДĐșŃĐŸĐŒ. ĐĐ»Ń ĐČĐžĐ·ĐœĐ°ŃĐ”ĐœĐœŃ ŃĐ° Đ°ĐœĐ°Đ»ŃĐ·Ń ĐżĐŸĐșĐ°Đ·ĐœĐžĐșŃĐČ Đ±ŃĐŸĐ”Đ»Đ”ĐșŃŃĐžŃĐœĐŸŃ Đ°ĐșŃĐžĐČĐœĐŸŃŃŃ ĐŒâŃĐ·ŃĐČ ĐČĐžĐșĐŸŃĐžŃŃĐ°ĐœĐŸ ĐŒĐ”ŃĐŸĐŽ ŃŃĐŒĐ°ŃĐœĐŸŃ (ĐżĐŸĐČĐ”ŃŃ
ĐœĐ”ĐČĐŸŃ) ДлДĐșŃŃĐŸĐŒŃĐŸĐłŃĐ°ŃŃŃ.
РДзŃĐ»ŃŃĐ°ŃĐž ĐŽĐŸŃĐ»ŃĐŽĐ¶Đ”ĐœŃ ŃĐ° ŃŃ
ĐŸĐ±ĐłĐŸĐČĐŸŃĐ”ĐœĐœŃ. ĐŃŃĐ»Ń ĐżŃĐŸĐČĐ”ĐŽĐ”ĐœĐŸĐłĐŸ Đ»ŃĐșŃĐČĐ°ĐœĐœŃ ŃĐżĐŸŃŃĐ”ŃŃгалО ĐœĐŸŃĐŒĐ°Đ»ŃĐ·Đ°ŃŃŃ ĐżĐŸĐșĐ°Đ·ĐœĐžĐșŃĐČ Đ±ŃĐŸĐ”Đ»Đ”ĐșŃŃĐžŃĐœĐŸŃ Đ°ĐșŃĐžĐČĐœĐŸŃŃŃ, Đ·ĐŒĐ”ĐœŃĐ”ĐœĐœŃ ĐżĐ°ŃĐ°ŃŃĐœĐșŃŃĐŸĐœĐ°Đ»ŃĐœĐžŃ
ĐżŃĐŸŃĐČŃĐČ Ń ĐŒâŃĐ·Đ°Ń
ŃĐ° ŃĐ°ŃŃĐŸŃĐž ŃпалаŃ
ŃĐČ ŃĐżĐŸĐœŃĐ°ĐœĐœĐŸŃ Đ°ĐșŃĐžĐČĐœĐŸŃŃŃ ĐŒâŃĐ·ŃĐČ Ń ŃŃĐ°ĐœŃ ŃĐżĐŸĐșĐŸŃ, ĐœĐŸŃĐŒĐ°Đ»ŃĐ·Đ°ŃŃŃ ŃĐ”ŃĐ”ĐŽĐœŃĐŸŃ Đ°ĐŒĐżĐ»ŃŃŃĐŽĐž бŃĐŸĐżĐŸŃĐ”ĐœŃŃĐ°Đ»ŃĐČ Ń ŃŃĐ°ĐœŃ Đ°ĐșŃĐžĐČĐœĐŸŃŃŃ, ĐČŃĐŽŃŃŃĐœŃŃŃŃ ŃŃĐ°ĐłĐŒĐ”ĐœŃĐ°ŃŃĐč, ĐżĐŸĐșŃĐ°ŃĐ”ĐœĐœŃ ŃĐžĐœŃ
ŃĐŸĐœĐœĐŸŃŃŃ ŃĐ° ĐșĐŸĐŸŃĐŽĐžĐœĐ°ŃŃŃ ŃĐșĐŸŃĐŸŃĐ”ĐœŃ ĐŸĐ±ŃŃĐ”Đ¶Đ”ĐœĐžŃ
ĐŒâŃĐ·ŃĐČ ĐżŃĐž ŃŃŃŃ
паŃĐŸĐ»ĐŸĐłŃŃŃ
ĐżŃĐžĐșŃŃŃ.
ĐĐžŃĐœĐŸĐČĐșĐž. ĐŃĐŸĐČĐ”ĐŽĐ”ĐœĐ” ĐŸŃŃĐŸĐŽĐŸĐœŃĐžŃĐœĐ” Đ»ŃĐșŃĐČĐ°ĐœĐœŃ Đ·Đ°Đ±Đ”Đ·ĐżĐ”ŃĐžĐ»ĐŸ ĐČŃĐŽĐœĐŸĐČĐ»Đ”ĐœĐœŃ ĐœĐ”ĐčŃĐŸĐŒâŃĐ·ĐŸĐČĐŸĐłĐŸ Đ±Đ°Đ»Đ°ĐœŃŃ Đ·ŃĐ±ĐŸŃĐ”Đ»Đ”ĐżĐœĐŸĐłĐŸ апаŃĐ°ŃŃ ĐżĐ°ŃŃŃĐœŃŃĐČ ŃĐ· ŃŃĐ·ĐœĐžĐŒĐž паŃĐŸĐ»ĐŸĐłŃŃĐŒĐž ĐżŃĐžĐșŃŃŃ, ŃĐŸ ĐŒĐ°Ń ŃĐżŃĐžŃŃлОĐČĐžĐč ĐČплОĐČ ĐœĐ° ĐșĐŸŃĐ”ĐșŃŃŃ ĐŒĐŸĐČĐ»Đ”ĐœĐœŃĐČĐžŃ
ĐżĐŸŃŃŃĐ”ĐœŃ
Two chemically distinct root lignin barriers control solute and water balance.
Lignin is a complex polymer deposited in the cell wall of specialised plant cells, where it provides essential cellular functions. Plants coordinate timing, location, abundance and composition of lignin deposition in response to endogenous and exogenous cues. In roots, a fine band of lignin, the Casparian strip encircles endodermal cells. This forms an extracellular barrier to solutes and water and plays a critical role in maintaining nutrient homeostasis. A signalling pathway senses the integrity of this diffusion barrier and can induce over-lignification to compensate for barrier defects. Here, we report that activation of this endodermal sensing mechanism triggers a transcriptional reprogramming strongly inducing the phenylpropanoid pathway and immune signaling. This leads to deposition of compensatory lignin that is chemically distinct from Casparian strip lignin. We also report that a complete loss of endodermal lignification drastically impacts mineral nutrients homeostasis and plant growth
Lateral Distribution of Muons in IceCube Cosmic Ray Events
In cosmic ray air showers, the muon lateral separation from the center of the
shower is a measure of the transverse momentum that the muon parent acquired in
the cosmic ray interaction. IceCube has observed cosmic ray interactions that
produce muons laterally separated by up to 400 m from the shower core, a factor
of 6 larger distance than previous measurements. These muons originate in high
pT (> 2 GeV/c) interactions from the incident cosmic ray, or high-energy
secondary interactions. The separation distribution shows a transition to a
power law at large values, indicating the presence of a hard pT component that
can be described by perturbative quantum chromodynamics. However, the rates and
the zenith angle distributions of these events are not well reproduced with the
cosmic ray models tested here, even those that include charm interactions. This
discrepancy may be explained by a larger fraction of kaons and charmed
particles than is currently incorporated in the simulations
Search for non-relativistic Magnetic Monopoles with IceCube
The IceCube Neutrino Observatory is a large Cherenkov detector instrumenting
of Antarctic ice. The detector can be used to search for
signatures of particle physics beyond the Standard Model. Here, we describe the
search for non-relativistic, magnetic monopoles as remnants of the GUT (Grand
Unified Theory) era shortly after the Big Bang. These monopoles may catalyze
the decay of nucleons via the Rubakov-Callan effect with a cross section
suggested to be in the range of to
. In IceCube, the Cherenkov light from nucleon decays
along the monopole trajectory would produce a characteristic hit pattern. This
paper presents the results of an analysis of first data taken from May 2011
until May 2012 with a dedicated slow-particle trigger for DeepCore, a
subdetector of IceCube. A second analysis provides better sensitivity for the
brightest non-relativistic monopoles using data taken from May 2009 until May
2010. In both analyses no monopole signal was observed. For catalysis cross
sections of the flux of non-relativistic
GUT monopoles is constrained up to a level of at a 90% confidence level,
which is three orders of magnitude below the Parker bound. The limits assume a
dominant decay of the proton into a positron and a neutral pion. These results
improve the current best experimental limits by one to two orders of magnitude,
for a wide range of assumed speeds and catalysis cross sections.Comment: 20 pages, 20 figure
Search for Relativistic Magnetic Monopoles with IceCube
We present the first results in the search for relativistic magnetic
monopoles with the IceCube detector, a subsurface neutrino telescope located in
the South Polar ice cap containing a volume of 1 km. This analysis
searches data taken on the partially completed detector during 2007 when
roughly 0.2 km of ice was instrumented. The lack of candidate events
leads to an upper limit on the flux of relativistic magnetic monopoles of
\Phi_{\mathrm{90%C.L.}}\sim 3\e{-18}\fluxunits for . This is a
factor of 4 improvement over the previous best experimental flux limits up to a
Lorentz boost below . This result is then interpreted for a
wide range of mass and kinetic energy values.Comment: 11 pages, 11 figures. v2 is minor text edits, no changes to resul
Book Reviews
With the observation of high-energy astrophysical neutrinos by the IceCube Neutrino Observatory, interest has risen in models of PeV-mass decaying dark matter particles to explain the observed flux. We present two dedicated experimental analyses to test this hypothesis. One analysis uses 6 years of IceCube data focusing on muon neutrino âtrackâ events from the Northern Hemisphere, while the second analysis uses 2 years of âcascadeâ events from the full sky. Known background components and the hypothetical flux from unstable dark matter are fitted to the experimental data. Since no significant excess is observed in either analysis, lower limits on the lifetime of dark matter particles are derived: we obtain the strongest constraint to date, excluding lifetimes shorter than s at 90% CL for dark matter masses above 10 TeV
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