(2 +1)-dimensional Duffin-Kemmer-Petiau oscillator under a magnetic field in the presence of a minimal length in the noncommutative space

Using the momentum space representation, we study the (2 +1)-dimensional Duffin-Kemmer-Petiau oscillator for spin 0 particle under a magnetic field in the presence of a minimal length in the noncommutative space. The explicit form of energy eigenvalues are found, the wave functions and the corresponding probability density are reported in terms of the Jacobi polynomials. Additionally, we also discuss the special cases and depict the corresponding numerical results

Wideband Back-Cover Antenna Design Using Dual Characteristic Modes With High Isolation for 5G MIMO Smartphone

© 2022 IEEE - All rights reserved. This is the accepted manuscript version of an article which has been published in final form at https://doi.org/10.1109/TAP.2022.3145456A novel method of designing a wideband high isolated dual-antenna pair using dual characteristic modes (CMs)is presented for fifth-generation (5G) multiple-input multiple output (MIMO) smartphone applications. A set of orthogonal CMs resonating from the square-loop slot is first introduced and works for the lower band. Then, another set of orthogonal CMs resonating from the edge branches is introduced with a shared compact radiator and works for the higher band. In combination with two sets of degenerated CMs and a capacitive coupling feeding structure, the proposed dual-antenna pair achieves abroad impedance bandwidth and high isolation without the need for any external decoupling structures. Based on this dual-antenna pair, an 8×8 MIMO array is developed and integrated into the back cover of a smartphone, which realizes zero ground clearance on the system circuit board. To verify the design concept, prototypes of the antenna pair and MIMO array were fabricated and measured. It shows that experimental results agree well with the simulation results. More importantly, the presented 8×8 MIMO array has high isolation of more than 20 dBis achieved across the operating band of 3.3-3.8 GHz.Peer reviewedFinal Accepted Versio

Policy Optimization with Stochastic Mirror Descent

Improving sample efficiency has been a longstanding goal in reinforcement learning. In this paper, we propose the $\mathtt{VRMPO}$: a sample efficient policy gradient method with stochastic mirror descent. A novel variance reduced policy gradient estimator is the key of $\mathtt{VRMPO}$ to improve sample efficiency. Our $\mathtt{VRMPO}$ needs only $\mathcal{O}(\epsilon^{-3})$ sample trajectories to achieve an $\epsilon$-approximate first-order stationary point, which matches the best-known sample complexity. We conduct extensive experiments to show our algorithm outperforms state-of-the-art policy gradient methods in various settings

Testosterone promotes human foreskin fibroblast growth through miR-143-3p targeting IGFBP-3

Testosterone is an important male hormone, which could improve the maintenance and recovery of gonadal function in males as well as the repair of human hypospadias and cell fibrosis. Our study focused on investigating the regulatory effect of testosterone in human foreskin fibroblasts (HFF-1) and regulatory mechanisms involved. In this study, HFF-1 cells were treated with testosterone, and cell viability and migration were assessed by cell counting kit-8 (CCK8) and Transwell assays. The expression levels of androgen receptor (AR), miR-143-3p and insulin-like growth factor binding protein-3 (IGFBP-3) were measured by quantitative real-time PCR (qRT-PCR), Western blotting, and immunofluorescence. In addition, a potential binding site for miR-143-3p on IGFBP-3 was predicted and its direct binding was further confirmed by a dual luciferase reporter assay. These results showed that testosterone increased the viability and migration of HFF-1 cells. Testosterone could down-regulate miR-143-3p and up-regulate IGFBP-3 and AR. Overexpression of miR-143-3p hindered HFF-1 cell viability and negatively regulated IGFBP-3, whereas inhibition of IGFBP-3 impeded cell viability and migration. Furthermore, miR-143-3p was found to directly bind to IGFBP-3. Overexpression of IGFBP-3 countered the regulation of HFF-1 cells by miR-143-3p mimics. In conclusion, this study showed that testosterone promoted the proliferation and migration of HFF-1 cells and AR signaling, at least via the miR-143-3p/IGFBP-3 axis. This discovery presents a novel insight for testosterone application in male disorders like hypospadias

Compact dual-band antenna based on CRLH-TL for WWAN/LTE terminal applications

In this article, a compact dual‐band antenna based on composite right/left‐handed transmission line (CRLH‐TL) is proposed for WWAN/LTE wireless terminal applications. By using 2 symmetrical CRLH structures, the proposed antenna can easily produce 2 wide separate operating frequency bands with a compact size of 25 × 25 × 6 mm3. Additionally, a pair of matching strips is introduced on both sides of the feeding line to further improve the impedance characteristics of the terminal antenna. The experimental results demonstrate the proposed antenna is capable of working over the frequency ranges of 0.66‐1.06 GHz and 1.68‐2.88 GHz with |S11| < −6 dB, which can cover the bands of LTE700, GSM850, GSM900, GSM1800, GSM1900, UMTS, LTE2300, and LTE2500 for wireless terminals. Moreover, the multiple input multiple output (MIMO) operating performance of the proposed antenna element is also studied, and an enhanced isolation between the antenna elements is obtained by utilizing the defected ground structures and grounded branches