The spectrum of the random environment and localization of noise

We consider random walk on a mildly random environment on finite transitive d- regular graphs of increasing girth. After scaling and centering, the analytic spectrum of the transition matrix converges in distribution to a Gaussian noise. An interesting phenomenon occurs at d = 2: as the limit graph changes from a regular tree to the integers, the noise becomes localized.Comment: 18 pages, 1 figur

Conductivity sum rule, implication for in-plane dynamics and c-axis response

Recently observed $c$-axis optical sum rule violations indicate non-Fermi liquid in-plane behavior. For coherent $c$-axis coupling, the observed flat, nearly frequency independent $c$-axis conductivity $\sigma_{1}(\omega)$ implies a large in-plane scattering rate $\Gamma$ around $(0,\pi)$ and therefore any pseudogap that might form at low frequency in the normal state will be smeared. On the other hand incoherent $c$-axis coupling places no restriction on the value of $\Gamma$ and gives a more consistent picture of the observed sum rule violation which, we find in some cases, can be less than half.Comment: 3 figures. To appear in PR

Radiative Corrections for Pion Polarizability Experiments

We use the semi-analytical program RCFORGV to evaluate radiative corrections to one-photon radiative emission in the high-energy scattering of pions in the Coulomb field of a nucleus with atomic number Z. It is shown that radiative corrections can simulate a pion polarizability effect. The average effect was estimated for pion energies 40-600 GeV. We also study the range of applicability of the equivalent photon approximation in describing one-photon radiative emission.Comment: 11 pages (LaTex), 6 figures, 1 table. No changes in the paper. New submission because old files are corrupted in arXi

An experimental measurement of corona discharge using laser Dopplervelocimetry

A point to plane testing discharge system was constructed allowing the flow of air to pass, circulate and return to its initial status, when corona is initiated by the alternating applied voltage on the stressed electrode. The corona wind velocity was measured by means of a laser Doppler velocimetry system implemented and calibrated in the laboratory. The velocity measurement was carried out without disturbing the field configuration intensity or the wind flow. The direction and pattern of the corona electric wind was visualized and observed through a laser curtain; this was achieved by guiding smoke to the discharge medium near the stressed electrode. Velocity measurements were obtained for various radial distances r, taken on the central discharge axis for several inter-electrode distances b. The direct observation of the obtained data shows an increase of the corona wind velocity with the applied voltage and the corona discharge current and substantial decrease as the radial distance is enlarged. An experimental investigation was conducted in the research laboratory to use electric wind corona discharge and enhance the available information supporting the corona discharge and applied voltage relationship along with the geometrical system parameter

The STAT5 transcription factor in B-cells of patients with chronic lymphocytic leukemia

Aim. To find out the cause of inhibition of the IL2-STAT5 signaling pathway in chronic lymphocytic leukemia (CLL) cells. Methods.CLL cells were isolated from peripheral blood, using gradient centrifugation on a ficoll-verografin mixture. Expression of the STAT1-6 genes at the mRNA level was analyzed, using the Oncomine database. Expression, phosphorylation status and cellular localization of the STAT5 protein were studied by fluorescence microscopy, using specific antibodies. Results.Unlike B-cells of healthy donors, expression of the STAT5A protein was low in the patient CLL cells. As we have previously shown, the IL-2-STAT5 (JAK-STAT5) signaling pathway is inhibited in CLL cells. Now we demonstrated a low level of phosphorylation of the STAT5 protein, or a complete lack of phosphorylation in CLL cells. The STAT5A protein shows cytoplasmic localization, indicating the absence of complexes in the nucleus that activate/repress transcription of the STAT5-dependent genes. Conclusions. Inhibition of the IL-2-STAT5 pathway in CLL cells is caused by a lack of the STAT5 proteins phosphorylation and/or the absence of the active STAT5A transcription complexes in the nucleus of CLL cells.Мета. Встановити причину блокування сигнального шляху IL2-STAT5 у клітинах крові хворих на хронічний ліфмолейкоз (ХЛЛ). Методи. Клітини ХЛЛ виділяли з периферичної крові пацієнтів, хворих на ХЛЛ, за допомогою центрифугування у градієнтіфікол-верографін. Експресію генів STAT1-6 на рівні мРНК аналізували за допомогою бази даних Oncomine. Експресію, статус фосфорилювання і клітинну локалізацію білка STAT5 вивчали методом флуоресцентної мікроскопії з використаннім специфічних антитіл. Результати. Навідмінувід В-клітин здорових людей, експресія білка STAT5А була низькою у клітинах хворих на ХЛЛ. Як нами було встановлено раніше, сигнальний шлях IL-2-STAT5 (JAK-STAT5) інгібовано у клітинах ХЛЛ. Нами було показано низький рівень фосфорилювання білків STAT5, або повну відсутність фосфорильованої форми протеїнів в лейкемічних клітинах. Протеїн STAT5А показує цитоплазматичну локалізацію, що вказує н авідсутність у ядрікомплексів, активуючих транскрипцію генів, залежних від фактора транскрипції STAT5. Висновки. Інгибування сигнального клітинного шляху IL-2-STAT5 в клітинах крові хворих на ХЛЛ реалізується за рахунок гіпофосфорилювання протеїнів STAT5 та/або відсутності активних комплексів транскрипції STAT5А у ядрі лейкемичних клітин.Цель. Установить причину блокирования сигнального пути IL2-STAT5 в клетках крови больных хроническим лимфолейкозом (ХЛЛ). Методы. Лейкемические клетки выделяли из периферической крови с помощью центрифугирования в градиенте плотности фиколл-верографин. Экспрессию генов STAT1-6 на уровне мРНК анализировали с помощью базы данных Oncomine. Экспрессию, статус фосфорилирования и клеточную локализацию белка STAT5 изучали методом флуоресцентной микроскопии с использованием специфических антител. Результаты. В отличие от В-клеток здоровых людей, экспрессия белка STAT5А была низкой в клетках больных ХЛЛ. Как нами было установлено ранее, сигнальный путь IL-2-STAT5 (JAK-STAT5) ингибирован в клетках ХЛЛ. Намибылпоказаннизкийуровеньфосфорилированиябелков STAT5 или полное отсутствие фосфорилированной формы протеинов в лейкемических клетках. Протеин STAT5А показывает цитоплазматическую локализацию, что указывает на отсутствие в ядре комплексов, активирующих транскрипцию генов, зависимых от фактора транскрипции STAT5. Выводы. Ингибирование сигнального клеточного пути IL-2-STAT5 в клетках крови больных ХЛЛ происходит за счёт гипофосфорилирования белков STAT5 и/или отсутствия активных комплексов транскрипции STAT5А в ядре лейкемических клеток

Multiplicativity of completely bounded p-norms implies a new additivity result

We prove additivity of the minimal conditional entropy associated with a quantum channel Phi, represented by a completely positive (CP), trace-preserving map, when the infimum of S(gamma_{12}) - S(gamma_1) is restricted to states of the form gamma_{12} = (I \ot Phi)(| psi >< psi |). We show that this follows from multiplicativity of the completely bounded norm of Phi considered as a map from L_1 -> L_p for L_p spaces defined by the Schatten p-norm on matrices; we also give an independent proof based on entropy inequalities. Several related multiplicativity results are discussed and proved. In particular, we show that both the usual L_1 -> L_p norm of a CP map and the corresponding completely bounded norm are achieved for positive semi-definite matrices. Physical interpretations are considered, and a new proof of strong subadditivity is presented.Comment: Final version for Commun. Math. Physics. Section 5.2 of previous version deleted in view of the results in quant-ph/0601071 Other changes mino

Observation of microwave radiation using low-cost detectors at the anka storage ring

Synchrotron light sources emit Coherent Synchrotron Radiation (CSR) for wavelengths longer than or equal to the bunch length. At most storage rings CSR cannot be observed, because the vacuum chamber cuts off radiation with long wavelengths. There are different approaches for shifting the CSR to shorter wavelengths that can propagate through the beam pipe, e.g.: the accelerator optics can be optimized for a low momentum compaction factor, thus reducing the bunch length. Alternatively, laser slicing can modulate substructures on long bunches [1]. Both techniques extend the CSR spectrum to shorter wavelengths, so that CSR is emitted at wavelengths below the waveguide shielding cut off. Usually fast detectors, like superconducting bolometer detector systems or Schottky barrier diodes, are used for observation of dynamic processes in accelerator physics. In this paper, we present observations of microwave radiation at ANKA using an alternative detector, a LNB (Low Noise Block) system. These devices are usually used in standard TV-SAT-receivers and are very cheap. We determined the time response of LNBs to be below 100 ns. The sensitivity of LNBs is optimized to detect very low intensity ”noise-like” signals. This microwave radiation study shows the possibility to apply the LNB for bunch length monitoring