56 research outputs found
Study of multicharged heavy ion generation from CO2 laser-produced plasma
The results of lead ion generation with charge state from Pb10+ to Pb35+ from laser-heated plasma are presented. CO2 lasers producing 10.6-μm wavelength radiation at power densities in the range 4.1011-6.1014 W/cm2 in TBKI and CERN were used. Results of detailed numerical simulations presented in the paper are in good agreement with the experimental data. Work done in collaboration with CERN, ITEP, and TBKI was aimed at the specification of requirements for a laser system that will be able to drive an ion source for the hadron collider (LHC) at CER
МУЛЬТИЦЕНТРОВОЙ АНАЛИЗ РЕЗУЛЬТАТОВ ПРИМЕНЕНИЯ ПРЯМОГО БОКОВОГО МЕЖТЕЛОВОГО СПОНДИЛОДЕЗА (DLIF) И ТРАНСКУТАННОЙ ТРАНСПЕДИКУЛЯРНОЙ ФИКСАЦИИ У ПАЦИЕНТОВ С ДЕГЕНЕРАТИВНЫМИ ЗАБОЛЕВАНИЯМИ МЕЖПОЗВОНКОВЫХ ДИСКОВ ПОЯСНИЧНОГО ОТДЕЛА ПОЗВОНОЧНИКА
Background: The technique of lateral lumbar interbody fusion for the surgical treatment of patients with degenerative diseases of the lumbar spine was developed in the early 2000s. But at the same time in modern literature there is no uniform approach to the use this technique, clinical outcomes and radiological findings are contradictory. Aims: to conduct a multicenter analysis of clinical outcomes and instrumental data of direct lateral interbody fusion (DLIF) approach combined with transcutaneous pedicle fixation in patients with single-level degenerative disc diseases of the lumbar spine. Materials and methods: The study included 103 patients (63 men and 40 women, mean age 45.8±9.7 years) who underwent surgery followed by DLIF transcutaneous pedicle fixation. The surgery was performed at neurosurgical and vertebrological departments in Irkutsk (Russia), Omsk (Russia), and Astana (Kazakhstan). Dynamic observation and comprehensive clinical and instrumental evaluation of the treatment results were carried out for an 18-month period after surgery. Results: After the simultaneous decompressive-stabilizing intervention, in all patients we detected a decrease in the severity of pain syndrome on VAS — from 6.9±1.6 to 1.7±1.2 cm (p0.001), and improved quality of life index (Oswestry) — from 21.3±6.8 to 12.3±4.4% (p0.001). The instrumental methods of examination determined the effective indirect decompression: an increase in the size of interbody gap in the middle of its department compared with the preoperative value from 8.6±3.1 to 15.7±4.2 mm (p0.001) and an increase in the area of the intervertebral foramen (on the left with an average of 98.7±32.3 and 156.8±45.1 mm2, p0.001; on the right —99.7±37.3 to 153.4±38.7 mm2, p0.001). We also registered the restoration of both the segmental (from 10.2±3.8 to 13.6±6.7°, p0.001) and regional (from 32.8±5.9 to 48.2±7.3°, р0.001) lumbar lordosis. Complete interbody fusion was diagnosed in 87 (86.4%) patients. Complications were observed in 8.7% of cases. Conclusions: DLIF technique combined with transcutaneous transpedicular stabilization has high clinical efficacy confirmed by significant reduction in the severity of pain according to VAS. The studied approach improves the quality of life of patients by Oswestry index and reveals a low number of postoperative complications. The described simultaneous minimally invasive method of surgical treatment in patients with degenerative disc diseases allows to restore the sagittal profile of the lumbar spine and implement an effective stabilization of the operated vertebral-motor segments with a high degree of formation of interbody bone block.Обоснование. Методика бокового поясничного межтелового спондилодеза для хирургического лечения пациентов с дегенеративными заболеваниями поясничного отдела позвоночника разработана в начале 2000-х годов. Но при этом в современных литературных источниках отсутствует единый подход к ее использованию, а клинические исходы и рентгенологические результаты являются противоречивыми.Цель исследования: провести мультицентровой анализ клинических исходов и инструментальных данных использования методики прямого бокового межтелового спондилодеза (Direct lateral interbody fusion, DLIF) в сочетании с транскутанной транспедикулярной фиксацией у пациентов с одноуровневыми дегенеративными заболеваниями межпозвонковых дисков поясничного отдела позвоночника.Методы. В исследование включены 103 пациента (63 мужчины, 40 женщин, средний возраст 45,8±9,7 года), оперированных в нейрохирургических и вертебрологических отделениях Иркутска (Россия), Омска (Россия), Астаны (Казахстан), которым была выполнена операция DLIF с последующей транскутанной транспедикулярной стабилизацией. Динамическое наблюдение и комплексную клиническую и инструментальную оценку результатов лечения проводили в течение 18 мес после операции.Результаты. После симультанного декомпрессивно-стабилизирующего вмешательства у всех пациентов отмечено уменьшение степени выраженности болевого синдрома по визуальной аналоговой шкале (ВАШ) с 6,9±1,6 до 1,7±1,2 см (p0,001) и улучшение качества жизни по индексу Освестри с 21,3±6,8 до 12,3±4,4% (p0,001). По данным инструментальных методов обследования определена эффективная непрямая декомпрессия: увеличение размера межтелового промежутка в среднем его отделе по сравнению с дооперационным значением с 8,6±3,1 до 15,7±4,2 мм (р0,001) и увеличение площади межпозвонковых отверстий — слева в среднем с 98,7±32,3 до 156,8±45,1 мм2 (р0,001), справа с 99,7±37,3 до 153,4±38,7 мм2 (р0,001). Также отмечено восстановление как сегментарного (с 10,2±3,8 до 13,6±6,7°; р0,001), так и регионарного (с 32,8±5,9 до 48,2±7,3°; р0,001) поясничного лордоза. Полноценный межтеловой спондилодез диагностирован у 87 (86,4%) пациентов. Осложнения наблюдались в 8,7% случаев.Заключение. Методика DLIF в сочетании с транскутанной транспедикулярной стабилизацией обладает высокой клинической эффективностью, подтвержденной значимым снижением выраженности болевого синдрома по ВАШ, улучшением качества жизни пациентов по индексу Освестри и низким количеством послеоперационных осложнений. Также описываемый симультанный минимально-инвазивный способ хирургического лечения пациентов с дегенеративными заболеваниями межпозвонковых дисков позволяет восстановить сагиттальный профиль поясничного отдела позвоночника и осуществить эффективную стабилизацию оперированных позвоночно-двигательных сегментов с высокой степенью формирования межтелового костного блока
Measurement of omega meson parameters in pi^+pi^-pi^0 decay mode with CMD-2
About 11 200 e^+e^- -> omega -> pi^+pi^-pi^0 events selected in the center of
mass energy range from 760 to 810 MeV were used for the measurement of the
\omega meson parameters. The following results have been obtained: sigma
_{0}=(1457 \pm 23 \pm 19)nb, m_{\omega}=(782.71 \pm 0.07 \pm 0.04) MeV/c^{2},
\Gamma_{\omega}=(8.68 \pm 0.23 \pm 0.10) MeV,
\Gamma_{e^+e^-}\cdot Br (\omega -> pi^+pi^-pi^0)=
(0.528 \pm 0.012 \pm 0.007) \cdot 10^{-3} MeV.Comment: 8 pages, 4 figure
Study of the radiative decay with CMD-2 detector
Using the of data collected with the CMD-2 detector at VEPP-2M
the decay mode , has been
studied. The obtained branching ratio is B(.Comment: 13 pages, 5 figures, LaTex2e, to be published in Phys. Lett.
Observation of semileptonic decays with CMD-2 detector
The decay has been observed by the CMD-2 detector at
the e^+e^- collider VEPP-2M at Novosibirsk. Of 6 million produced
pairs, events of the decay were selected. The
corresponding branching ratio is . This result is consistent with the evaluation of from the semileptonic rate and lifetime
assuming .Comment: 7 pages, 6 figures, LaTex2e. Submitted to Phys.Lett.
Study of the process e+e- to pi+pi-pi+pi-pi0 with CMD-2 detector
The process e+e- to pi+ pi- pi+ pi- pi0 has been studied in the center of
mass energy range 1280 -- 1380 MeV using 3.0 1/pb of data collected with the
CMD-2 detector in Novosibirsk. Analysis shows that the cross section of the
five pion production is dominated by the contributions of the eta pi+pi- and
omega pi+pi- intermediate states.Comment: 8 pages, 3 figure. Submitted to Phys. Lett.
Study of the Process in the C.M.Energy Range 1.05-1.38 GeV with CMD-2
The process has been studied with the CMD-2 detector
using about 950 events detected in the center-of-mass energy range from 1.05 to
1.38 GeV. The cross section exceeds the expectation based on the contributions
of the rho(770), omega(782) and phi(1020) mesons only.Comment: 12 pages, 3 figures, uses elsart.cls, submitted to Physics Letters
Observation of the conversion decay at CMD-2
Using 15.1^{-1} of data collected by CMD-2 in the -meson energy range,
the branching ratio of the conversion decay has been
measured for the first time: B(\phi\to\pi^0e^+e^-) = (1.22 \pm 0.34 \pm 0.21)
\cdot 10 ^{-5}.Comment: 13 pages, 6 PostScript figures, uses refmerge.sty. To be published in
Phys. Lett.
Cross section of the reaction below 1 GeV at CMD-2
Using 3.07 of data collected in the energy range 0.60-0.97 GeV by
CMD-2, about 150 events of the process \epm \to \pch have been selected. The
energy dependence of the cross section agrees with the assumption of the
intermediate state which is dominant above 1 GeV. For the first
time \fourpi events are observed at the meson energy. Under the
assumption that all these events come from the meson decay, the value of
the cross section at the meson peak corresponds to the following decay
width:
\Gamma(\rho^0 \to \fourpi) = (2.8 \pm 1.4 \pm 0.5) {keV} or to the branching
ratio
B(\rho^0 \to \fourpi) = (1.8 \pm 0.9 \pm 0.3) \cdot 10 ^{-5}.Comment: 15 pages, 5 figure
Study of the Process e+ e- --> omega pi0 --> pi0 pi0 gamma in c.m. Energy Range 920--1380 MeV at CMD-2
The cross section of the process e+ e- --> omega pi0 --> pi0 pi0 gamma has
been measured in the c.m. energy range 920-1380 MeV with the CMD-2 detector.
Its energy dependence is well described by the interference of the rho(770) and
rho'(1450) mesons decaying to omega pi0. Upper limits for the cross sections of
the direct processes e+ e- --> pi0 pi0 gamma, eta pi0 gamma have been set.Comment: Accepted for publication in PL
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