Adiabatic entanglement transport in Rydberg aggregates

We consider the interplay between excitonic and atomic motion in a regular, flexible chain of Rydberg atoms, extending our recent results on entanglement transport in Rydberg chains [W\"uster et al., Phys.Rev.Lett 105 053004 (2010)]. In such a Rydberg chain, similar to molecular aggregates, an electronic excitation is delocalised due to long range dipole-dipole interactions among the atoms. The transport of an exciton that is initially trapped by a chain dislocation is strongly coupled to nuclear dynamics, forming a localised pulse of combined excitation and displacement. This pulse transfers entanglement between dislocated atoms adiabatically along the chain. Details about the interaction and the preparation of the initial state are discussed. We also present evidence that the quantum dynamics of this complex many-body problem can be accurately described by selected quantum-classical methods, which greatly simplify investigations of excitation transport in flexible chains

Sustainable development of smallholder crop-livestock farming in developing countries

Meeting the growing demand for animal-sourced food, prompted by population growth and increases in average per-capita income in low-income countries, is a major challenge. Yet, it also presents significant potential for agricultural growth, economic development, and reduction of poverty in rural areas. The main constraints to livestock producers taking advantage of growing markets include; lack of forage and feed gaps, communal land tenure, limited access to land and water resources, weak institutions, poor infrastructure and environmental degradation. To improve rural livelihood and food security in smallholder crop-livestock farming systems, concurrent work is required to address issues regarding efficiency of production, risk within systems and development of whole value chain systems. This paper provides a review of several forage basedstudies in tropical and non-tropical dry areas of the developing countries. A central tenet of this paper is that forages have an essential role in agricultural productivity, environmental sustainability and livestock nutrition in smallholder mixed farming systems

Efficient out-coupling of high-purity single photons from a coherent quantum dot in a photonic-crystal cavity

We demonstrate a single-photon collection efficiency of $(44.3\pm2.1)\%$ from a quantum dot in a low-Q mode of a photonic-crystal cavity with a single-photon purity of $g^{(2)}(0)=(4\pm5)\%$ recorded above the saturation power. The high efficiency is directly confirmed by detecting up to $962\pm46$ kilocounts per second on a single-photon detector on another quantum dot coupled to the cavity mode. The high collection efficiency is found to be broadband, as is explained by detailed numerical simulations. Cavity-enhanced efficient excitation of quantum dots is obtained through phonon-mediated excitation and under these conditions, single-photon indistinguishability measurements reveal long coherence times reaching $0.77\pm0.19$ ns in a weak-excitation regime. Our work demonstrates that photonic crystals provide a very promising platform for highly integrated generation of coherent single photons including the efficient out-coupling of the photons from the photonic chip.Comment: 13 pages, 8 figures, submitte

Dynamical phases and intermittency of the dissipative quantum Ising model

We employ the concept of a dynamical, activity order parameter to study the Ising model in a transverse magnetic field coupled to a Markovian bath. For a certain range of values of the spin-spin coupling, magnetic field and dissipation rate, we identify a first order dynamical phase transition between active and inactive {\em dynamical phases}. We demonstrate that dynamical phase-coexistence becomes manifest in an intermittent behavior of the bath quanta emission. Moreover, we establish the connection between the dynamical order parameter that quantifies the activity, and the longitudinal magnetization that serves as static order parameter. The system we consider can be implemented in current experiments with Rydberg atoms and trapped ions

HSTR-Net: Reference Based Video Super-resolution for Aerial Surveillance with Dual Cameras

Aerial surveillance requires high spatio-temporal resolution (HSTR) video for more accurate detection and tracking of objects. This is especially true for wide-area surveillance (WAS), where the surveyed region is large and the objects of interest are small. This paper proposes a dual camera system for the generation of HSTR video using reference-based super-resolution (RefSR). One camera captures high spatial resolution low frame rate (HSLF) video while the other captures low spatial resolution high frame rate (LSHF) video simultaneously for the same scene. A novel deep learning architecture is proposed to fuse HSLF and LSHF video feeds and synthesize HSTR video frames at the output. The proposed model combines optical flow estimation and (channel-wise and spatial) attention mechanisms to capture the fine motion and intricate dependencies between frames of the two video feeds. Simulations show that the proposed model provides significant improvement over existing reference-based SR techniques in terms of PSNR and SSIM metrics. The method also exhibits sufficient frames per second (FPS) for WAS when deployed on a power-constrained drone equipped with dual cameras.Comment: 15 pages, 8 figures, 8 table

New records of Decapod Crustaceans (Decapoda: Pontoniinae and Inachidae) associated with sea anemones in Turkish waters

Three anemone-associated decapod crustaceans, two shrimp species, Periclimenes amethysteus and P. aegylios (Caridea: Palaemonidae: Pontoniinae), and the crab Inachus phalangium (Brachyura: Inachidae), all collected from the Dardanelles, are reported for the first time from Turkish coasts. Another inachid crab, Macropodia czernjawskii is also reported for the first time to occur in association with the sea anemone, Anemonia viridis. Periclimenes scriptus was the fifth decapod species recorded associated with sea anemones within the present study, and while this species has already been reported from Turkish waters, this is the first time it is recorded from the Dardanelles (the Turkish Straits System)

Effect of Friction Time on Microstructure and Mechanical Properties of Friction Welded AISI 304 Stainless Steel to AISI 1060 Steel

The influence of friction time on the hardness, tensile properties, and microstructure of the welded samples is investigated. With increasing friction time, the hardness and tensile strength values increase too. The hardness of the welding interfaces is higher than that of the base alloys. Microstructures of the welds are examined by the optical and scanning electron microscopy. The results show that all welding joints are perfectly bonded and free of any cracks, pores, and defects. The tensile fracture of welded joint occurred in the AISI 304 side. The chemical composition of the interfaces and deformation zones are detected using energy dispersive spectroscopy. Diffusion of the Cr and Ni is evident on the AISI 1060 side.Досліджено вплив тривалости тертя на твердість, властивості при розтягу та на мікроструктуру зварних зразків. При збільшенні тривалости тертя твердість та границя міцности на розрив також збільшуються. Міцність поверхні зварних контактів виявляється більшою, аніж у основних стопів. Мікроструктуру зварних швів було досліджено методами оптичної й електронної мікроскопії. Показано, що зварні з’єднання були досконало звареними та не мали ніяких тріщин, пор і дефектів. Руйнування при розтягу відбувалося з боку криці AISI 304. Хемічний склад зварних контактів і зон деформації досліджено за допомогою енергодисперсійної спектроскопії. Спостерігалася дифузія Cr та Ni в бік криці AISI 1060. Исследуется влияние времени трения на твёрдость, свойства при растяжении и на микроструктуру сварных образцов. При увеличении времени трения твёрдость и предел прочности на разрыв также увеличиваются.Прочность поверхности сварных контактов оказывается выше, чем у основных сплавов. Микроструктура сварных швов исследуется методами оптической и электронной микроскопии. Показано, что все сварные соединения были идеально сварены и не имели никаких трещин, пор и дефектов. Разрушение при растяжении происходит со стороны стали AISI 304. Химический состав сварных контактов и зон деформации исследуются с помощью энергодисперсионной спектроскопии. Наблюдается диффузия Cr и Ni в сторону стали AISI 1060

Rooftop solar Photovoltaic (PV) plant – one year measured performance and simulations

© 2021 The Author(s). In this study, 1-year real life performance of a 30kWp rooftop solar PV power plant installed at the Köprübaşı Vocational School of the Manisa Celal Bayar University was evaluated and is presented here. The PV plant is comprised of 116 polycrystalline modules mounted 15 cm proud of the roof surface providing a gap between roof surface and the bottom of the panels for air circulation. The panels were tilted at 12° with horizontal and orientated at an azimuth angle of -20°. Measured power output of the plant was compared against the predictions of a spreadsheet based simulation model developed. Results were found to be in excellent agreement with the measured values. Annual array yield, final yield and reference yield values of the system that produced 45,592kWh of energy, under an average 1,818kWh/m2/a radiation incident on the panels inclined surfaces, were found to be 4.25, 4.97 and 4.16 h/d, respectively. The annual performance ratio of the system has been calculated as 83.61% and the capacity factor 17.35%. It has been determined that the power plant displaced 23.5 tonnes of CO2 emissions in 2018.Zafer Development Agency's project "TR33-16-SUCEP-0028"

Unusual metastases of lung cancer: bulbus oculi and maxillary sinus

Lung adenocarcinoma often makes metastasis to the brain, liver, kidneys, bone, bone marrow and adrenal glands. It can also make metastasis to other parts of the body rarely for example eye, nose, parotid gland and paranasal sinus. We did not encounter with combined ocular bulbus and the maxillary sinus metastases of lung cancer in the accessible literature. In this case report, a patient who was combined ocular bulbus and the maxillary sinus metastases of lung adenocarcinoma will be discussed. Key Words: eye metastases, lung adenocarcinoma, paranasal sinus metastases