A digital calibration technique for an ultra high-speed wide-bandwidth folding and interpolating analog-to-digital converter in 0.18-μm CMOS technology

A digital calibration technique for an ultra high-speed folding and interpolating analog-to-digital converter in 0.18-μm CMOS technology is presented.The similar digital calibration techniques are taken for high 3-bit flash converter and low 5-bit folding and interpolating converter,which are based on well-designed calibration reference, calibration DAC and comparators.The spice simulation and the measured results show the ADC produces 5.9 ENOB with calibration disabled and 7.2 ENOB with calibration enabled for high-frequency wide-bandwidth analog input.     

HNB小区UE准入控制策略研究

在介绍LAC资源分配方案的基础上,对封闭模式下不同的准入控制方案进行了分析,并着重给出了一个完整的准入控制解决方案。     

基于PLC控制的液压缸试验台的研究

文章主要分析了基于PLC控制的SHP系列单柱液压缸试验台,针对大多数液压缸试验台性能不稳定、速度不快、结构不紧凑等缺点,采用西门子PLC开发一套新型的液压缸试验台控制系统。该控制系统具有性能稳定、速度快、操作方便、使用寿命长等优点。     

海底观测网连通可靠性分析

归纳了一种通用的水下节点光通信模型,引入节点存活率作为海底观测网的可靠性指标,针对水下多分支节点较多导致的可靠性降低和铺设施工难度增加等缺点,将NEPTUNE优化为只包含两个多分支节点的交叉环拓扑。对上述两种网络的可靠性进行了仿真,结果表明,交叉环拓扑与NEPTUNE相比具有相近的可靠性,但多分支节点数量更少,便于海底观测网的供电和铺设。     

Support vector regression via MCMC within evidence framework

This paper proposes a novel approach, Markov Chain Monte Carlo (MCMC) sampling approximation, to deal with intractable high-dimension integral in the evidence framework applied to Support Vector Regression (SVR). Unlike traditional variational or mean field method, the proposed approach follows the idea of MCMC, firstly draws some samples from the posterior distribution on SVR??s weight vector, and then approximates the expected output integrals by finite sums. Experimental results show the proposed approach is feasible and robust to noise. It also shows the performance of proposed approach and Relevance Vector Machine (RVM) is comparable under the noise circumstances. They give better robustness compared to standard SVR.     

Vertical Nonvolatile Schottky-Barrier-Field-Effect Transistor with Self-Gating Semimetal Contact

Emerging 2D nonvolatile Schottky-barrier-field-effect transistors (NSBFETs) are envisaged to build a promising reconfigurable in-memory architecture to mimic the brain. Herein, a vertically stacked multilayered graphene (MGr)-molybdenum disufide (MoS₂)-tungsten ditelluride (WTe₂) NSBFET is reported. The semimetal WTe₂ with the charge-trapping effect enables the simultaneous integration of the electrode and the self-gating function. The effective Schottky barrier height offset ΔΦ_B is programed from ΔΦ_B-p = 132.6 meV to ΔΦ_B-n = 109.4 meV, inducing the reversed built-in electric field to make the NSBFET, so as to provide one with a multifunctional platform to integrate the nonvolatility and the reconfigurable self-powered photo response. The reversible open-circuit voltages of NSBFET synapse are programmed from −0.1 to 0.25 V and the self-powered responsivity with reversed signs is tuned from 290 to −50 mA W⁻¹, which enables the representation of a signed weight in a single device to enrich multiple optical sensing and computing capabilities.     

Simultaneous CO2 and H2O Activation via Integrated Cu Single Atom and N Vacancy Dual-Site for Enhanced CO Photo-Production

Photocatalytic conversion of CO₂ into fuels using pure water as the proton source is of immense potential in simultaneously addressing the climate-change crisis and realizing a carbon-neutral economy. Single-atom photocatalysts with tunable local atomic configurations and unique electronic properties have exhibited outstanding catalytic performance in the past decade. However, given their single-site features they are usually only amenable to activations involving single molecules. For CO₂ photoreduction entailing complex activation and dissociation process, designing multiple active sites on a photocatalyst for both CO₂ reduction and H₂O dissociation simultaneously is still a daunting challenge. Herein, it is precisely construct Cu single-atom centers and two-coordinated N vacancies as dual active sites on CN (Cu₁/N_2CV-CN). Experimental and theoretical results show that Cu single-atom centers promote CO₂ chemisorption and activation via accumulating photogenerated electrons, and the N_2CV sites enhance the dissociation of H₂O, thereby facilitating the conversion from COO* to COOH*. Benefiting from the dual-functional sites, the Cu₁/N_2CV-CN exhibits a high selectivity (98.50%) and decent CO production rate of 11.12 µmol g⁻¹ h⁻¹. An ingenious atomic-level design provides a platform for precisely integrating the modified catalyst with the deterministic identification of the electronic property during CO₂ photoreduction process.     

Poly(pentahydropyrimidine)-Based Hybrid Hydrogel with Synergistic Antibacterial and Pro-Angiogenic Ability for the Therapy of Diabetic Foot Ulcers

Bacterial infection and impaired angiogenesis make the treatment of diabetic foot ulcers (DFU) extremely challenging. Cationic polymers are expected to treat infected wounds due to their excellent antibacterial properties, but still, it is difficult to meet the therapeutic needs of pro-angiogenesis and anti-infections due to their simple construction units and outmoded synthesis methods. Herein, a cationic poly(pentahydropyrimidine) (PPHP) library with strong modifiability is synthesized to construct a hybrid hydrogel with synergistic therapeutic effects for the treatment of infected DFUs. It is found that the as-synthesized hybrid hydrogel can up-regulate angiogenesis-related gene (HIF-1, VEGF, and bFGFR/bFGF) expression and targeted disruption of bacterial cell membranes, which finally promotes the healing of infected DFU (wound healing rate: 92%) within 10 days. This hydrogel, thus, holds great promise in developing new strategies to significantly enhance the treatment of DFU and other bacterial-infected pathological diagnoses.     

WDM光网络中的组播路由算法研究

组播是一种应用广泛的点到多点或多点到多点的通信方式.本文剖析了光层组播的特点,在综合分类的基础上,对光网络组播路由算法的最新研究进展进行了归纳和总结,指出了其面临的问题与挑战,并对今后需重点研究的方向进行了展望.     

基于WinCE的AX88796 NDIS网络驱动程序

在WinCE5．0提供的NE2000驱动程序基础上,讨论了NDIS网络驱动程序结构,在S3C2410开发平台上实现了基于WinCE5．0的AX88796网卡小端口驱动程序,讨论了其在视频监控系统中的应用。