Global Partial Density of States: Statistics and Localization Length in Quasi-one Dimensional disordered systems

We study the distributions functions for global partial density of states (GPDOS) in quasi-one-dimensional (Q1D) disordered wires as a function of disorder parameter from metal to insulator. We consider two different models for disordered Q1D wire: a set of two dimensional $\delta$ potentials with an arbitrary signs and strengths placed randomly, and a tight-binding Hamiltonian with several modes and on-site disorder. The Green functions (GF) for two models were calculated analytically and it was shown that the poles of GF can be presented as determinant of the rank $N\times N$, where $N$ is the number of scatters. We show that the variances of partial GPDOS in the metal to insulator crossover regime are crossing. The critical value of disorder $w_c$ where we have crossover can be used for calculation a localization length in Q1D systems.Comment: RevTex4 8 .eps figure

Comparative evaluation of biochemical parameters and mineral composition of Cucurbita ficifolia, C. maxima and C. moschata fruit, grown in the northern hemisphere

Fruit peel/pulp distribution of biologically active compounds is an important characteristic of plant physiology and the basis of zero waste production in agriculture. Among C. ficifolia, C. maxima and C. moschata the former showed the lowest dry matter content, especially in peel, similar peel and pulp values of antioxidant activity (AOA) and polyphenol content (TP), with the highest levels in fruit placenta. Peel carbohydrate profile of C. ficifolia fruit was characterized by lower levels of disaccharides compared to C. maxima and C. moschata peel and an opposite pattern of monosaccharides accumulation. The analysis of 25 elements content in Cucurbita peel and pulp, using ICP-MS, indicated that C. ficifolia fruit are characterized by significantly high concentrations of Sr, Si and I in pulp compared to the values of C. maxima and C. moschata. On the contrary, C. maxima and C. moschata were characterized by low concentration of pulp Mn. Highly significant positive correlations were recorded between Cr-Sr, Cr-Ca and CaSr (r=0.906; 0.939 and 0.974 respectively) and P-Cu (r=0.968). Despite C. ficifolia, does not contain carotenoids, it is highly valuable due to the high levels of Si, I, Cr and Ca in peel and pulp, which reveals new areas of its application

Сравнительная оценка биохимических показателей и минерального состава плодов Cucurbita ficifolia, C. maxima и C. moschata

Fruit peel/pulp distribution of biologically active compounds is an important characteristic of plant physiology and the basis of zero waste production in agriculture. Among C. ficifolia, C. maxima and C. moschata the former showed the lowest dry matter content, especially in peel, similar peel and pulp values of antioxidant activity (AOA) and polyphenol content (TP), with the highest levels in fruit placenta. Peel carbohydrate profile of C. ficifolia fruit was characterized by lower levels of disaccharides compared to C. maxima and C. moschata peel and an opposite pattern of monosaccharides accumulation. The analysis of 25 elements content in Cucurbita peel and pulp, using ICP-MS, indicated that C. ficifolia fruit are characterized by significantly high concentrations of Sr, Si and I in pulp compared to the values of C. maxima and C. moschata. On the contrary, C. maxima and C. moschata were characterized by low concentration of pulp Mn. Highly significant positive correlations were recorded between Cr-Sr, Cr-Ca and CaSr (r=0.906; 0.939 and 0.974 respectively) and P-Cu (r=0.968). Despite C. ficifolia, does not contain carotenoids, it is highly valuable due to the high levels of Si, I, Cr and Ca in peel and pulp, which reveals new areas of its application. Распределение биологически активных соединений между кожурой и мякотью плодов является важной характеристикой особенности физиологии растения и может служить основой для безотходного производства в сельском хозяйстве.Результаты. Установлено, что среди трех видов тыквы: фиголистной (C. ficifolia), крупноплодной (C. maxima) и мускатной (C. moschata), – фиголистная тыква содержит наименьшее количество сухого вещества, особенно в кожуре плодов, сходные уровни общей антиоксидантной активности (АОА) и содержания полифенолов (ТР) в кожуре и мякоти при максимальных показателях антиоксидантного статуса в плаценте. Углеводный профиль кожуры фиголистной тыквы C. ficifolia характеризовался наименьшими уровнями дисахаридов по сравнению с кожурой крупноплодной C. maxima и мускатной тыквы C. moschata и наибольшими уровнями моносахаров. ИСП-МС анализ содержания 25 элементов в кожуре и мякоти исследованных видов тыквы показал, что фиголистная тыква отличается значительно более высокими уровнями накопления в мякоти Sr, Si, I по сравнению с аналогичными данными для тыквы крупноплодной C. maxima и мускатной C. moschata. Напротив, плоды крупноплодной и мускатной тыквы характеризовались низкими концентрациями Mn в мякоти. Установлены статистически достоверные положительные корреляции между Cr-Sr, Cr-Ca и Ca-Sr (r=0.906; 0.939 и 0.974 соответственно), а также P-Cu (r=0.968). Несмотря на то, что плоды фиголистной тыквы C. ficifolia не содержат каротиноиды, их пищевая ценность в значительной степени связана с высокими уровнями Si, I, Cr и Ca в кожуре плодов и мякоти, что открывает новые горизонты использования этого вида.

First Results from The GlueX Experiment

The GlueX experiment at Jefferson Lab ran with its first commissioning beam in late 2014 and the spring of 2015. Data were collected on both plastic and liquid hydrogen targets, and much of the detector has been commissioned. All of the detector systems are now performing at or near design specifications and events are being fully reconstructed, including exclusive production of $\pi^{0}$, $\eta$ and $\omega$ mesons. Linearly-polarized photons were successfully produced through coherent bremsstrahlung and polarization transfer to the $\rho$ has been observed.Comment: 8 pages, 6 figures, Invited contribution to the Hadron 2015 Conference, Newport News VA, September 201

Search for a new gauge boson in the A′A' Experiment (APEX)

We present a search at Jefferson Laboratory for new forces mediated by sub-GeV vector bosons with weak coupling $\alpha'$ to electrons. Such a particle $A'$ can be produced in electron-nucleus fixed-target scattering and then decay to an $e^+e^-$ pair, producing a narrow resonance in the QED trident spectrum. Using APEX test run data, we searched in the mass range 175--250 MeV, found no evidence for an $A'\to e^+e^-$ reaction, and set an upper limit of $\alpha'/\alpha \simeq 10^{-6}$. Our findings demonstrate that fixed-target searches can explore a new, wide, and important range of masses and couplings for sub-GeV forces.Comment: 5 pages, 5 figures, references adde

Nanoscopic Tunneling Contacts on Mesoscopic Multiprobe Conductors

We derive Bardeen-like expressions for the transmission probabilities between two multi-probe mesoscopic conductors coupled by a weak tunneling contact. We emphasize especially the dual role of a weak coupling contact as a current source and sink and analyze the magnetic field symmetry. In the limit of a point-like tunneling contact the transmission probability becomes a product of local, partial density of states of the two mesoscopic conductors. We present expressions for the partial density of states in terms of functional derivatives of the scattering matrix with respect to the local potential and in terms of wave functions. We discuss voltage measurements and resistance measurements in the transport state of conductors. We illustrate the theory for the simple case of a scatterer in an otherwise perfect wire. In particular, we investigate the development of the Hall-resistance as measured with weak coupling probes.Comment: 10 pages, 5 figures, revte

Measurement of the Electric Form Factor of the Neutron at Q^2=0.5 and 1.0 (GeV/c)^2

The electric form factor of the neutron was determined from measurements of the \vec{d}(\vec{e},e' n)p reaction for quasielastic kinematics. Polarized electrons were scattered off a polarized deuterated ammonia target in which the deuteron polarization was perpendicular to the momentum transfer. The scattered electrons were detected in a magnetic spectrometer in coincidence with neutrons in a large solid angle detector. We find G_E^n = 0.0526 +/- 0.0033 (stat) +/- 0.0026 (sys) and 0.0454 +/- 0.0054 +/- 0.0037 at Q^2 = 0.5 and 1.0 (GeV/c)^2, respectively.Comment: 5 pages, 2 figures, as publishe