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https://www.readbyqxmd.com/read/29097666/a-simple-tensor-network-algorithm-for-two-dimensional-steady-states
#1
Augustine Kshetrimayum, Hendrik Weimer, Román Orús
Understanding dissipation in 2D quantum many-body systems is an open challenge which has proven remarkably difficult. Here we show how numerical simulations for this problem are possible by means of a tensor network algorithm that approximates steady states of 2D quantum lattice dissipative systems in the thermodynamic limit. Our method is based on the intuition that strong dissipation kills quantum entanglement before it gets too large to handle. We test its validity by simulating a dissipative quantum Ising model, relevant for dissipative systems of interacting Rydberg atoms, and benchmark our simulations with a variational algorithm based on product and correlated states...
November 3, 2017: Nature Communications
https://www.readbyqxmd.com/read/29049033/squeezed-dirac-and-topological-magnons-in-a-bosonic-honeycomb-optical-lattice
#2
S A Owerre, J Nsofini
Quantum information storage using charge-neutral quasiparticles is expected to play a crucial role in the future of quantum computers. In this regard, magnons or collective spin-wave excitations in solid-state materials are promising candidates in the future of quantum computing. Here, we study the quantum squeezing of Dirac and topological magnons in a bosonic honeycomb optical lattice with spin-orbit interaction by utilizing the mapping to quantum spin-[Formula: see text] XYZ Heisenberg model on the honeycomb lattice with discrete Z2 symmetry and a Dzyaloshinskii-Moriya interaction...
October 19, 2017: Journal of Physics. Condensed Matter: An Institute of Physics Journal
https://www.readbyqxmd.com/read/29039868/inkjet-printed-barcodes-for-a-rapid-and-multiplexed-paper-based-assay-compatible-with-mobile-devices
#3
Mingzhu Yang, Wei Zhang, Wenshu Zheng, Fengjing Cao, Xingyu Jiang
This study reports a simple, rapid, low-cost, robust, and multiplexed barcoded paper-based assay (BPA) compatible with mobile devices. An inkjet printer and an XYZ dispensing platform were used to realize mass-manufacturing of barcoded paper-based analytical devices (BPADs) with high precision and efficiency. We designed a new group of barcodes and developed an application (APP) for the reading of the new code. The new barcodes possess a 16 times higher coding capacity than the standard Codabar code in our experiment on drug residue detection...
November 7, 2017: Lab on a Chip
https://www.readbyqxmd.com/read/28976183/ion-source-with-laser-triangulation-for-ambient-mass-spectrometry-of-nonplanar-samples
#4
Jan Rejšek, Vladimír Vrkoslav, Vít Pokorný, Vladimír Přibyl, Josef Cvačka
The analysis of nonplanar samples in ambient mass spectrometry poses a formidable challenge. Here, an ion source equipped with laser triangulation for analyzing nonplanar surfaces was constructed. It was designed as a two-position device, where the sample height was measured using laser triangulation and the target compounds were then analyzed. Thanks to a stage movable in xyz, the ion source maintained an optimal vertical distance between the sample and the sampling capillary for each measured spot during the surface analysis...
November 7, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/28940444/accurate-representation-of-interference-colours-michel-l%C3%A3-vy-chart-from-rendering-to-image-colour-correction
#5
S A Linge Johnsen, J Bollmann, H W Lee, Y Zhou
Here a work flow towards an accurate representation of interference colours (Michel-Lévy chart) digitally captured on a polarised light microscope using dry and oil immersion objectives is presented. The work flow includes accurate rendering of interference colours considering the colour temperature of the light source of the microscope and chromatic adaptation to white points of RGB colour spaces as well as the colour correction of the camera using readily available colour targets. The quality of different colour correction profiles was tested independently on an IT8...
September 21, 2017: Journal of Microscopy
https://www.readbyqxmd.com/read/28930101/squeezed-dirac-and-topological-magnons-in-a-bosonic-honeycomb-optical-lattice
#6
Solomon Owerre, Joachim Nsofini
Quantum information storage using charge-neutral quasiparticles are expected to play a crucial role in the future of quantum computers. In this regard, magnons or collective spin-wave excitations in solid-state materials are promising candidates in the future of quantum computing. Here, we study the quantum squeezing of Dirac and topological magnons in a bosonic honeycomb optical lattice with spin-orbit interaction by utilizing the mapping to quantum spin-$1/2$ XYZ Heisenberg model on the honeycomb lattice with discrete Z$_2$ symmetry and a Dzyaloshinskii-Moriya interaction...
September 20, 2017: Journal of Physics. Condensed Matter: An Institute of Physics Journal
https://www.readbyqxmd.com/read/28898756/bioreactor-culture-duration-of-engineered-constructs-influences-bone-formation-by-mesenchymal-stem-cells
#7
Debika Mitra, Jacklyn Whitehead, Osamu W Yasui, J Kent Leach
Perfusion culture of mesenchymal stem cells (MSCs) seeded in biomaterial scaffolds provides nutrients for cell survival, enhances extracellular matrix deposition, and increases osteogenic cell differentiation. However, there is no consensus on the appropriate perfusion duration of cellular constructs in vitro to boost their bone forming capacity in vivo. We investigated this phenomenon by culturing human MSCs in macroporous composite scaffolds in a direct perfusion bioreactor and compared their response to scaffolds in continuous dynamic culture conditions on an XYZ shaker...
November 2017: Biomaterials
https://www.readbyqxmd.com/read/28870990/three-dimensional-automated-reporter-quantification-3d-arq-technology-enables-quantitative-screening-in-retinal-organoids
#8
M Natalia Vergara, Miguel Flores-Bellver, Silvia Aparicio-Domingo, Minda McNally, Karl J Wahlin, Meera T Saxena, Jeff S Mumm, M Valeria Canto-Soler
The advent of stem cell-derived retinal organoids has brought forth unprecedented opportunities for developmental and physiological studies, while presenting new therapeutic promise for retinal degenerative diseases. From a translational perspective, organoid systems provide exciting new prospects for drug discovery, offering the possibility to perform compound screening in a three-dimensional (3D) human tissue context that resembles the native histoarchitecture and to some extent recapitulates cellular interactions...
October 15, 2017: Development
https://www.readbyqxmd.com/read/28751668/signatures-of-a-magnetic-field-induced-unconventional-nematic-liquid-in-the-frustrated-and-anisotropic-spin-chain-cuprate-licusbo4
#9
H-J Grafe, S Nishimoto, M Iakovleva, E Vavilova, L Spillecke, A Alfonsov, M-I Sturza, S Wurmehl, H Nojiri, H Rosner, J Richter, U K Rößler, S-L Drechsler, V Kataev, B Büchner
Modern theories of quantum magnetism predict exotic multipolar states in weakly interacting strongly frustrated spin-1/2 Heisenberg chains with ferromagnetic nearest neighbor (NN) inchain exchange in high magnetic fields. Experimentally these states remained elusive so far. Here we report strong indications of a magnetic field-induced nematic liquid arising above a field of ~13 T in the edge-sharing chain cuprate LiSbCuO4 ≡ LiCuSbO4. This interpretation is based on the observation of a field induced spin-gap in the measurements of the (7)Li NMR spin relaxation rate T 1(-1) as well as a contrasting field-dependent power-law behavior of T 1(-1) vs...
July 27, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28745630/subpial-adeno-associated-virus-9-aav9-vector-delivery-in-adult-mice
#10
Takahiro Tadokoro, Atsushi Miyanohara, Michael Navarro, Kota Kamizato, Stefan Juhas, Jana Juhasova, Silvia Marsala, Oleksandr Platoshyn, Erik Curtis, Brandon Gabel, Joseph Ciacci, Nada Lukacova, Katarina Bimbova, Martin Marsala
The successful development of a subpial adeno-associated virus 9 (AAV9) vector delivery technique in adult rats and pigs has been reported on previously. Using subpially-placed polyethylene catheters (PE-10 or PE-5) for AAV9 delivery, potent transgene expression through the spinal parenchyma (white and gray matter) in subpially-injected spinal segments has been demonstrated. Because of the wide range of transgenic mouse models of neurodegenerative diseases, there is a strong desire for the development of a potent central nervous system (CNS)-targeted vector delivery technique in adult mice...
July 13, 2017: Journal of Visualized Experiments: JoVE
https://www.readbyqxmd.com/read/28689986/quaternion-based-study-of-angular-velocity-of-the-cardiac-vector-during-myocardial-ischaemia
#11
Pablo Daniel Cruces, Pedro David Arini
BACKGROUND: Early detection of acute ischaemia through non-invasive methods remains a challenge in health research. Ischaemic condition caused by a decrease in the blood supply in a cardiac region induces hypoxia and metabolic abnormalities that contribute to the electrical instability of the heart and to the development of slow conduction in damaged tissue. METHODS: Herein, a percutaneous transluminal coronary angiography (PTCA) is considered as a model of supply ischaemia...
December 1, 2017: International Journal of Cardiology
https://www.readbyqxmd.com/read/28648473/qualification-of-a-precision-pattern-dispenser
#12
Raf Van Ammel, Katarzyna Sobiech-Matura, Uwe Wätjen, Tom Vercammen, Pieter Castelein, Roel Wuyts, Johan Paul
In order to automate sample preparation processes, a precision pattern dispenser was designed to reproducibly dispense radioactive solutions at pre-defined positions. It is composed of an automatic liquid sample handling unit coupled to an XYZ table. Qualification tests were conducted to evaluate the performance of the instrument and to assess the compliance with the requirements, in particular trueness (< 2%) and repeatability (< 1%). The instrument allows preparing sources in different source holders and on air filters, in a fast and accurate way...
June 16, 2017: Applied Radiation and Isotopes
https://www.readbyqxmd.com/read/28636327/maldi-ms-guided-liquid-microjunction-extraction-for-capillary-electrophoresis-electrospray-ionization-ms-analysis-of-single-pancreatic-islet-cells
#13
Troy J Comi, Monika A Makurath, Marina C Philip, Stanislav S Rubakhin, Jonathan V Sweedler
The ability to characterize chemical heterogeneity in biological structures is essential to understanding cellular-level function in both healthy and diseased states, but these variations remain difficult to assess using a single analytical technique. While mass spectrometry (MS) provides sufficient sensitivity to measure many analytes from volume-limited samples, each type of mass spectrometric analysis uncovers only a portion of the complete chemical profile of a single cell. Matrix-assisted laser desorption/ionization (MALDI) MS and capillary electrophoresis electrospray ionization (CE-ESI)-MS are complementary analytical platforms frequently utilized for single-cell analysis...
July 18, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/28556892/a-novel-method-to-analyse-in-vivo-the-physiological-state-and-cell-viability-of-phototrophic-microorganisms-by-confocal-laser-scanning-microscopy-using-a-dual-laser
#14
Laia Millach, Aleix Obiol, Antonio Solé, Isabel Esteve
Phototrophic microorganisms are very abundant in extreme environments, where are subjected to frequent and strong changes in environmental parameters. Nevertheless, little is known about the physiological effects of these changing environmental conditions on viability of these microorganisms, which are difficult to grow in solid media and have the tendency to form aggregates. For that reason, it is essential to develop methodologies that provide data in short time consuming, in vivo and with minimal manipulating the samples, in response to distinct stress conditions...
May 30, 2017: Journal of Microscopy
https://www.readbyqxmd.com/read/28505014/validation-of-a-smartphone-auscultatory-blood-pressure-kit-accutension-xyz-110-in-adults-according-to-the-ansi-aami-iso-81060-2-2013-standard
#15
Guang Chu, Zhi Zhang, Mengdan Xu, Daini Huang, Qiuyan Dai
OBJECTIVE: The aim of this study was to validate the accuracy of the Accutension XYZ-110 blood pressure (BP) kit according to the American National Standards Institute/Association for the Advancement of Medical Instrumentation/International Organization for Standardization (ANSI/AAMI/ISO) 81060-2:2013 standard. PARTICIPANTS AND METHODS: Systolic blood pressure (SBP) and diastolic blood pressure (DBP) were measured simultaneously on the same arm in 85 Chinese adults (female : male=48 : 37) with a mean age of 43...
October 2017: Blood Pressure Monitoring
https://www.readbyqxmd.com/read/28474942/emergence-of-supersymmetric-quantum-electrodynamics
#16
Shao-Kai Jian, Chien-Hung Lin, Joseph Maciejko, Hong Yao
Supersymmetric (SUSY) gauge theories such as the minimal supersymmetric standard model play a fundamental role in modern particle physics, but have not been verified so far in nature. Here, we show that a SUSY gauge theory with dynamical gauge bosons and fermionic gauginos emerges naturally at the pair-density-wave (PDW) quantum phase transition on the surface of a correlated topological insulator hosting three Dirac cones, such as the topological Kondo insulator SmB_{6}. At the quantum tricritical point between the surface Dirac semimetal and nematic PDW phases, three massless bosonic Cooper pair fields emerge as the superpartners of three massless surface Dirac fermions...
April 21, 2017: Physical Review Letters
https://www.readbyqxmd.com/read/28448053/automated-contraction-analysis-of-human-engineered-heart-tissue-for-cardiac-drug-safety-screening
#17
Ingra Mannhardt, Umber Saleem, Anika Benzin, Thomas Schulze, Birgit Klampe, Thomas Eschenhagen, Arne Hansen
Cardiac tissue engineering describes techniques to constitute three dimensional force-generating engineered tissues. For the implementation of these procedures in basic research and preclinical drug development, it is important to develop protocols for automated generation and analysis under standardized conditions. Here, we present a technique to generate engineered heart tissue (EHT) from cardiomyocytes of different species (rat, mouse, human). The technique relies on the assembly of a fibrin-gel containing dissociated cardiomyocytes between elastic polydimethylsiloxane (PDMS) posts in a 24-well format...
April 15, 2017: Journal of Visualized Experiments: JoVE
https://www.readbyqxmd.com/read/28426946/quantification-of-rubidium-as-a-trace-element-in-beef-using-laser-induced-breakdown-spectroscopy
#18
Y Dixit, Maria P Casado-Gavalda, R Cama-Moncunill, Maria Markiewicz-Keszycka, X Cama-Moncunill, P J Cullen, Carl Sullivan
This study evaluates the potential of laser induced breakdown spectroscopy (LIBS) coupled with chemometrics to develop a quantification model for rubidium (Rb) in minced beef. A LIBSCAN 150 system was used to collect LIBS spectra of minced beef samples. Beef liver was used to spike the Rb levels in minced beef. All samples were dried, powdered and pelleted using a hydraulic press. Measurements were conducted by scanning 100 different locations with an automated XYZ sample chamber. Partial least squares regression (PLSR) was used to develop the calibration model, yielding a calibration coefficient of determination (Rc(2)) of 0...
August 2017: Meat Science
https://www.readbyqxmd.com/read/28370277/3d-electron-microscopic-characterization-of-interstitial-cells-in-the-human-bladder-upper-lamina-propria
#19
Jochen Neuhaus, Birgit Schröppel, Martin Dass, Hans Zimmermann, Hartwig Wolburg, Petra Fallier-Becker, Thomas Gevaert, Claus J Burkhardt, Hoang Minh Do, Jens-Uwe Stolzenburg
AIMS: To explore the ultrastructure of interstitial cells in the upper lamina propria of the human bladder, to describe the spatial relationships and to investigate cell-cell contacts. METHODS: Focused ion beam scanning electron microscopy (FIB-SEM), 3-View SEM and confocal laser scanning microscopy were used to analyze the 3D ultrastructure of the upper lamina propria in male and female human bladders. RESULTS: 3View-SEM image stacks as large as 59 × 59 × 17 μm(3) (xyz) at a resolution of 16 × 16 × 50 nm(3) and high resolution (5 × 5 × 10 nm(3) ) FIB-SEM stacks could be analyzed...
March 31, 2017: Neurourology and Urodynamics
https://www.readbyqxmd.com/read/28268576/pixel-based-skin-segmentation-in-psoriasis-images
#20
Y George, M Aldeen, R Garnavi
In this paper, we present a detailed comparison study of skin segmentation methods for psoriasis images. Different techniques are modified and then applied to a set of psoriasis images acquired from the Royal Melbourne Hospital, Melbourne, Australia, with aim of finding the best technique suited for application to psoriasis images. We investigate the effect of different colour transformations on skin detection performance. In this respect, explicit skin thresholding is evaluated with three different decision boundaries (CbCr, HS and rgHSV)...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
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