Dramatic Tuning of the Topological Hall Effect in AxRhO2 (A = K,Rb, and Cs) Crystals by Electron Concentration or Cation

Topological Hall effect, being an unconventional anomalous Hall effect, is originated from the real-space Berry curvature caused by the nontrivial topological spin textures in materials. Manipulations of nontrivial magnetic structure and related topological Hall effect are very important for the study of the chiral magnet. Herein, it is experimentally observed that the significant topological Hall conductivity σ_xy in antiferromagnetic K_0.5RhO₂ can reach 3.5% of ν = 1 quantum conductivity below 20 K. Furthermore, by adjusting the concentration of K-cation different from 0.5 in K_xRhO₂ or substituting the K cations by Rb or Cs to form Rb_0.5RhO₂ or Cs_0.5RhO₂, it is observed that the topological Hall effect is much weakened or even disappeared. This evolution, verified by the theoretical calculations, is attributed to the unstable ground state of the non-coplanar spin structure in K_xRhO₂ (x = 0.4 and 0.6) and Cs_0.5RhO₂. The significantly tunable topological Hall effect in A_xRhO₂ makes it prospective on logical/sensor devices of spintronics.     

A Self-Assembly Combined Nano-Prodrug to Overcome Gemcitabine Chemo-Resistance of Pancreatic Tumors

Gemcitabine (GEM), as a first-line chemotherapeutics for pancreatic ductal adenocarcinoma (PDAC) treatment, still faces several clinical challenges, restricted by instability in blood circulations, low tumor selectivity, and acquired nature characteristics of chemo-resistance. To solve these challenges, the rational design of combination therapy with GEM and other therapy modalities is imperative. Herein, a small molecular self-assembly nano-prodrug is developed, which can achieve the co-delivery of GEM, Ferrocene and nutlin-3a on the achievement of GEM-induced apoptosis with ferroptosis. In this nano-prodrug, the disulfide linkage not only acts as a GSH-responsive trigger but also plays an important role in self-assembly behavior of nanoparticle that can load nutlin-3a. Interestingly, nutlin-3a plays an important role in both ferroptosis and apoptosis, one is effectively sensitized cells to ferroptosis by inhibiting cystine uptake, and the other is promoted apoptosis by elevating p53 expression. To further enhance the drug tumor accumulation and maintain stability in systemic circulations, this nano-prodrug is then encapsulated into plectin1 receptor-targeting phospholipid micelles (DSPE-PEG-PTP), which displays high selective tumor inhibition and good biosafety on different mice models, especially in orthotopic and patient-derived xenograft (PDX) models. The findings provide new insights into the combination therapy of GEM with ferroptosis for reduced chemo-resistance on PDAC treatment.     

Deterministic Polymorphic Engineering of MoTe2 for Photonic and Optoelectronic Applications

Developing selective and coherent polymorphic crystals at the nanoscale offers a novel strategy for designing integrated architectures for photonic and optoelectronic applications such as metasurfaces, optical gratings, photodetectors, and image sensors. Here, a direct optical writing approach is demonstrated to deterministically create polymorphic 2D materials by locally inducing metallic 1T′-MoTe₂ on the semiconducting 2H-MoTe₂ host layer. In the polymorphic-engineered MoTe₂, 2H- and 1T′- crystalline phases exhibit strong optical contrast from near-infrared to telecom-band ranges (1–1.5 µm), due to the change in the band structure and increase in surface roughness. Sevenfold enhancement of third harmonic generation intensity is realized with conversion efficiency (susceptibility) of ≈1.7 × 10⁻⁷ (1.1 × 10⁻¹⁹ m² V⁻²) and ≈1.7 × 10⁻⁸ (0.3 × 10⁻¹⁹ m² V⁻²) for 1T′ and 2H-MoTe₂, respectively at telecom-band ultrafast pump laser. Lastly, based on polymorphic engineering on MoTe₂, a Schottky photodiode with a high photoresponsivity of 90 AW⁻¹ is demonstrated. This study proposes facile polymorphic engineered structures that will greatly benefit realizing integrated photonics and optoelectronic circuits.     

Progress of Phosphate-based Polyanion Cathodes for Aqueous Rechargeable Zinc Batteries

Aqueous rechargeable zinc batteries (ARZBs) are recently prevailing devices that utilize the abundant Zn resources and the merits of aqueous electrolytes to become a competitive alternative for large-scale energy storage. Benefiting from the unique inductive effect and flexible structure, the past five years have experienced a diversiform of phosphate-based polyanion materials that are used as cathodes in ARZBs. In this review, the most recent advances in the Zn²⁺ storage mechanisms and electrolyte optimization of the phosphate-based cathodes of ARZBs, which mainly focus on vanadium/iron-based phosphates and their derivatives are presented. Furthermore, in addition to significant progress on polyanion phosphate-based cathode materials, the design strategies both for electrode materials and compatible electrolytes are also elaborated to improve the energy density and extend the cycling life of aqueous Zn/polyanion batteries.     

基于 K-means 的云化分布式 BPEL 引擎放置机制

针对分布式BPEL引擎在云中的放置问题开展研究,提出了一种基于K-means的分布式BPEL引擎放置机制,该机制将BPEL引擎放置问题模型化为相关最优化数学模型,并且将该模型映射到K-means算法进行求解。该机制还讨论了算法在不同网络拓扑随机图、树形网络拓扑的应用。最后利用统计软件R进行了相关实验仿真,仿真结果显示该放置机制可优化服务调用所占用的带宽资源。     

一种无线宽带收发机I/Q失配校准和补偿技术

本文提出一种基于数字基带的无线宽带收发机中的发射链路I/Q失配的校准和补偿技术。数字基带发射用于I/Q失配校准的信号,经过RF收发机的发射链路、由平方功率检测器、带通滤波器组成的校准通路以及RF接收机的可变增益放大器,数字基带采集此信号并估计I/Q失配的大小,完成I/Q失配的校准和补偿,此技术相比于射频的自校准节省了面积和功耗。本技术已经成功用于IEEE802.11n,可以实现50dB以上的镜像抑制,完全满足了系统要求。     

Multiscale Ion-Sieving Separator with Selective Zn2+ Channels and Excellent Zn2+ Desolvation Kinetics for Dendrite-Free and Kinetics-Enhanced Zinc Metal Batteries

Zn metal batteries have garnered considerable scientific and technological interests. However, the widespread commercial application of these batteries is impeded by the uncontrollable dendrite growth and consequent severe side effects. Herein, a functionalized separator is prepared by spraying polyaniline-modified graphene oxide (denoted as NPGO)/polyvinylidene difluoride solution directly on one side of a common separator of glass fibers (GFs). The reversible transition between protonated and deprotonated states of quinolone imide on NPGO nanosheets can facilitate the rapid desolvation and transfer of Zn²⁺. Therefore, the spatial electric field as well as the Zn²⁺ flux is effectively homogenized due to the ion-sieving effect of NPGO nanosheets that are oriented toward Zn anode. This engineering design of the NPGO@GFs separator harvests excellent rate and cycling performance (over 3000 cycles at 20 mA cm⁻²) for Zn metal symmetric batteries. Meanwhile, it provides an impressive commercial prospect (500 cycles with a capacity retention of 91.6% under 2000 mA g⁻¹) for MnO₂||Zn full batteries. Such a strategy can be generalized as a common way to protect metal anodes (Na, Zn, and K) in rechargeable batteries, which is highly cost-effective and scalable.     

计算机软件技术在大数据时代的应用分析

随着计算机技术的不断创新,大数据技术被广泛应用于各行各业,其产生的影响较大,为各行业的发展带来了新机遇和新挑战。在新背景的影响下,计算机软件技术的应用需要坚持与时俱进的目标。在持续创新和升级的过程中,需跟随时代发展脚步,推动大数据时代信息处理方式的优化,确保所构建的信息处理和应用方式具备创新性和实操性。文中基于大数据时代背景,结合计算机软件技术的应用优势,总结了更加有效的技术应用策略,为大数据信息处理这一环节提供了参考和借鉴。     

一种用于高斯光束远场整形的小型双透镜系统设计

为了实现高斯光束的远场均匀投射,利用Zemax 优化设计了一种由双凹、平凸双透镜组成的小型匀 光组件。基于理想均匀光斑在其径向上的照度积分与半径呈线性关系的原理,首先利用双凹 透镜缩短光路, 然后对平凸透镜进行约束优化。该组件长度为24mm,可对波长1064nm、腰斑直径400μm 的激光束实现 发散角为6.6°的远场均匀投射。经过设计模型在10m、30m 和40m投射距离处的模拟仿真,结果 显示在4个投射距离处的光斑均匀度都大于93.9%,能量利用率均高于 90%。该匀光组件仅由2个球面和 1个二次曲面构成,结构简单,间隔和厚度公差可达±0.03mm,拥 有良好的可加工性和实用性,在激光通信、激光干涉照明等领域中具有潜在的使用 价值。     

Dual-proxy key-based threshold signature scheme for ship ad-hoc network

In order to solve the problem of message authentication under the conditions of the ship ad-hoc network (SANET),a signature scheme that does not depend on trusted certificate authorities and tamper-proof devices (TPD) was proposed by using the threshold proxy signature scheme and the properties of bilinear pairings.The proposed scheme used the dual-proxy key and the threshold signature mechanism to enable the ship nodes calculate the message signature in polynomial time.Moreover,the security of the scheme was also proved under the random oracle model.The performance analysis results show that the proposed scheme can meet the requirement of strong proxy signature under the premise of guaranteeing correctness,and has lower computational cost and communication cost.