The COVID-19 virus has a significant impact on individuals around the globe. early diagnosis of this infectious disease is critical to preventing its global and local spread. In general, scientists have tested numerous ways methods detect people analyze virus. Interestingly, one used for X-rays that recognize whether person infected or not. Furthermore, researchers attempted use deep learning a...

Polluted by the noise of observation, precision satellite timing based on pseudoranges can merely reach tens nanoseconds. Considering sharply increasing demand high-precision in many fields, a traceable precise system has been proposed, which means having connection with UTC (Coordinated Universal Time). We introduce principle PPP (Precise Point Positioning) and conduct experiment form zero bas...

We analyze the energy and angular momenta of the two-spin spiky string moving on the AdS3×S with NS-NS field. Due to the infinite boundary of the AdS spacetime the solution will extend to infinity and it appears the divergences. After adding the counter terms we then obtain the dispersion relation of the corresponding giant magnon and see how the background field produces the correction terms. ...

Type IIA toroidal orientifolds offer a promising toolkit for model builders, especially when one includes not only the usual fluxes from NS-NS and R-R field strengths, but also fluxes that are T-dual to the NS-NS three-form flux. These new ingredients are known as metric fluxes and non-geometric fluxes, and can help stabilize moduli or can lead to other new features. In this paper we study two ...

In this paper we consider superstring propagation in a nontrivial NS-NS background. We deform the world sheet stress tensor and supercurrent with an infinitesimal Bμν field. We construct the gauge-covariant super-Poincaré generators in this background and show that the Bμν field spontaneously breaks spacetime supersymmetry. We find that the gauge-covariant spacetime momenta cease to commute wit...

in this paper, we nd the relationships between module contractibility of abanach algebra and its ideals. we also prove that module contractibility ofa banach algebra is equivalent to module contractibility of its module uniti-zation. finally, we show that when a maximal group homomorphic image ofan inverse semigroup s with the set of idempotents e is nite, the moduleprojective tensor product ...

Piezo-electric ultrasonic actuators offer large static torque and precise rotary motion while avoiding self-motion when un-powered. In this work, a U164-11 ultrasonic piezo-electric module driving an Al2O3 ceramic ring is controlled by a Xilinx Spartan 6 FPGA to implement a haptic feedback system. The controller supports a runtime-adjustable capture detent resolution to enable the input of disc...

This paper presents the design and implementation of a new digital-to-time converter (DTC). The obtained resolution is 1.02 ps, and the dynamic range is about 590 ns. The experimental results indicate that the measured differential nonlinearity (DNL) and integral nonlinearity (INL) are −0.17~+0.13 LSB and −0.35~+0.62 LSB, respectively. This DTC builds coarse and fine Vernier delay lines constru...