1,675 research outputs found
Intrinsic anomalous Hall effect across the magnetic phase transition of a spin-orbit-coupled Bose-Einstein condensate
We study theoretically the zero temperature intrinsic anomalous Hall effect
in an experimentally realized 2D spin-orbit coupled Bose gas. For anisotropic
atomic interactions and as the spin-orbit coupling strength increases, the
system undergoes a ground state phase transition from states exhibiting a total
in-plane magnetization to those with a perpendicular magnetization along the
direction. We show that finite frequency, or ac, Hall responses exist in
both phases in the absence of an artificial magnetic field, as a result of
finite inter-band transitions. However, the characteristics of the anomalous
Hall responses are drastically different in these two phases because of the
different symmetries preserved by the corresponding ground states. In
particular, we find a finite dc Hall conductivity in one phase but not the
other. The underlying physical reasons for this are analyzed further by
exploring relations of the dc Hall conductivity to the system's chirality and
Berry curvatures of the Bloch bands. Finally, we discuss an experimental method
of probing the anomalous Hall effect in trapped systems.Comment: 13 pages, 11 figure
Predictive Pre-allocation for Low-latency Uplink Access in Industrial Wireless Networks
Driven by mission-critical applications in modern industrial systems, the 5th
generation (5G) communication system is expected to provide ultra-reliable
low-latency communications (URLLC) services to meet the quality of service
(QoS) demands of industrial applications. However, these stringent requirements
cannot be guaranteed by its conventional dynamic access scheme due to the
complex signaling procedure. A promising solution to reduce the access delay is
the pre-allocation scheme based on the semi-persistent scheduling (SPS)
technique, which however may lead to low spectrum utilization if the allocated
resource blocks (RBs) are not used. In this paper, we aim to address this issue
by developing DPre, a predictive pre-allocation framework for uplink access
scheduling of delay-sensitive applications in industrial process automation.
The basic idea of DPre is to explore and exploit the correlation of data
acquisition and access behavior between nodes through static and dynamic
learning mechanisms in order to make judicious resource per-allocation
decisions. We evaluate the effectiveness of DPre based on several monitoring
applications in a steel rolling production process. Simulation results
demonstrate that DPre achieves better performance in terms of the prediction
accuracy, which can effectively increase the rewards of those reserved
resources.Comment: Full version (accepted by INFOCOM 2018
Design And Fabrication of Condenser Microphone Using Wafer Transfer And Micro-electroplating Technique
A novel fabrication process, which uses wafer transfer and
micro-electroplating technique, has been proposed and tested. In this paper,
the effects of the diaphragm thickness and stress, the air-gap thickness, and
the area ratio of acoustic holes to backplate on the sensitivity of the
condenser microphone have been demonstrated since the performance of the
microphone depends on these parameters. The microphone diaphragm has been
designed with a diameter and thickness of 1.9 mm and 0.6 m, respectively,
an air-gap thickness of 10 m, and a 24% area ratio of acoustic holes to
backplate. To obtain a lower initial stress, the material used for the
diaphragm is polyimide. The measured sensitivities of the microphone at the
bias voltages of 24 V and 12 V are -45.3 and -50.2 dB/Pa (at 1 kHz),
respectively. The fabricated microphone shows a flat frequency response
extending to 20 kHz.Comment: Submitted on behalf of EDA Publishing Association
(http://irevues.inist.fr/handle/2042/16838
Accelerated colorimetric immunosensingusing surface-modified porous monolithsand gold nanoparticles
A rapid and sensitive immunoassay platform integrating polymerized monoliths and gold nanoparticles (AuNPs) has been developed. The porous monoliths are photopolymerized in situ within a silica capillary and serve as solid support for high-mass transport and high-density capture antibody immobilization to create a shorter diffusion length for antibody–antigen interactions, resulting in a rapid assay and low reagent consumption. AuNPs are modified with detection antibodies and are utilized as signals for colorimetric immunoassays without the need for enzyme, substrate and sophisticated equipment for quantitative measurements. This platform has been verified by performing a human IgG sandwich immunoassay with a detection limit of 0.1 ng ml−1. In addition, a single assay can be completed in 1 h, which is more efficient than traditional immunoassays that require several hours to complete
The combination of blue dye and radioisotope versus radioisotope alone during sentinel lymph node biopsy for breast cancer: a systematic review
High Dose ESAs Are Associated with High iPTH Levels in Hemodialysis Patients with End-Stage Kidney Disease: A Retrospective Analysis
Objective: Anemia and secondary hyperparathyroidism are the two most common complications associated with chronic kidney disease (CKD). Erythropoiesis-stimulating agents (ESAs) are widely used in the management of anemia in hemodialysis patients. A reverse correlation has been established between hyperparathyroidism and hemoglobin levels. The aim of this retrospective study is to evaluate the relationship of high dose ESAs and hyperparathyroidism in hemodialysis patients with anemia. Methods: A total of 240 uremic patients maintained on regular hemodialysis were enrolled into this study. Among them, 142 patients were treated with Epiao® (epoetin-alfa) and 98 patients were treated with Recormon® (epoetin-beta). The target hemoglobin concentration was 110-130 g/L. Laboratory measurements including hemoglobin, calcium, phosphorus, albumin, intact-parathyroid hormone (iPTH), serum ferritin and transferrin saturation were collected. Results: Hemoglobin concentration increased as iPTH level decreased by stratification. However, no significant association between anemia and calcium or phosphorus level was found. Patients with iPTH levels within 150-300 pg/mL had the highest levels of hemoglobin, serum ferritin and transferrin saturation. Patients treated with Recormon and Epiao had similar hemoglobin concentrations. However, the dose of Recormon for anemia treatment was significantly less than that the dose of Epiao (P<0.05). The level of iPTH in the Recormon group was significantly lower than in the Epiao group. In patients with hemoglobin levels between 110-130 g/L (P<0.05), iPTH level was found to be significantly lower in patients treated with lower doses of ESAs than in patients treated with higher doses of ESAs, no matter which ESA was used (Recormon or Epiao, P<0.05). Conclusions: The dose of ESAs might be positively associated with iPTH level, suggesting that a reasonable hemoglobin target can be achieved by using the lowest possible ESA dose
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