二分图的无关分解及其在覆盖问题中的应用

为了大容量存贮器制造过程中因缺陷而造成成品率低的问题，或并行阵列中的容错重组问题，一般采用冗余修复的方法，该问题可以归结为对二分图的覆盖，且该问题属于ＮＰ完全问题。     

光纤数字环路载波系统的发展

ＯＤＬＣ是当今用户接入网的新型设备，它一方面可取代端局，解决通信线路紧张和远距离大容量放号问题，另一方面也可满足日益增多的增值业务的需求。本文ＯＤＬＣ技术的基本原理，结合目前国内外常见ＯＤＬＣ系统，总结和对比了其基本特点，优势，并指明ＯＤＬＣ的技术发展方向和中国应用的前景。     

Structure sensitivity of the catalytic oxidative coupling of methane on lanthanum oxide

The oxidative coupling of methane (OCM) has been found to be structure sensitive on La₂O₃ catalysts exhibiting different crystallite morphologies. Thin plates obtained by thermal decomposition of lanthanum nitrate at 650 °C are more selective on OCM reaction performed at 750 °C than the particles obtained by decomposition of the nitrate at 800 °C. It is assumed that the oxycarbonate observed is formed from the methane deep oxidation on the catalyst surface. This compound appears to act as an intermediate in the production of CO₂ and is thus important hi the resulting selectivity.     

Scalable Gaussian Normal Basis Multipliers over GF(2<Superscript><Emphasis Type=Italic>m</Emphasis></Superscript>) Using Hankel Matrix-Vector Representation

This work presents a novel scalable multiplication algorithm for a type-t Gaussian normal basis (GNB) of GF(2^m). Utilizing the basic characteristics of MSD-first and LSD-first schemes with d-bit digit size, the GNB multiplication can be decomposed into n(n + 1) Hankel matrix-vector multiplications. where n = (mt + 1)/d. The proposed scalable architectures for computing GNB multiplication comprise of one d × d Hankel multiplier, four registers and one final reduction polynomial circuit. Using the relationship of the basis conversion from the GNB to the normal basis, we also present the modified scalable multiplier which requires only nk Hankel multiplications, where k = mt/2d if m is even or k = (mt − t + 2)/2d if m is odd. The developed scalable multipliers have the feature of scalability. It is shown that, as the selected digit size d ≥ 8, the proposed scalable architectures have significantly lower time-area complexity than existing digit-serial multipliers. Moreover, the proposed architectures have the features of regularity, modularity, and local interconnection ability. Accordingly, they are well suited for VLSI implementation.     

H2S-Activated Ion-Interference Therapy: A Novel Tumor Targeted Therapy Based on Copper-Overload-Mediated Cuproptosis and Pyroptosis

Copper overload is a novel way to achieve copper-ion-interference therapy by disrupting copper homeostasis and treating diseases through multiple cell death pathways. However, it is difficult to reach copper overload since excess intracellular copper ions will be pumped out. Herein, copper overload is achieved by both raising cellular uptake and reducing the efflux of copper ions using hydrogen sulfide (H₂S)-responsive copper hydroxyphosphate nanoparticles (Cu₂(PO₄)(OH) NPs). After immersion in an H₂S-enriched colon cancer microenvironment, Cu₂(PO₄)(OH) NPs can transform into copper sulfide NPs with reduced size for higher cell entering, resulting in improved Fenton activity as well as copper ion dissociation. Reactive oxygen species generated by the Fenton reaction not only activate inflammasomes and Caspase-1 proteins, cause the cleavage of gasdermin D to induce pyroptosis, but also affect mitochondrial function and down-regulate copper exporter ATP7A to further reduce the copper excretion. The combination of higher endocytosis and lower exportation leads to maximized copper overload. Together with the efficient copper ions release, mitochondrial tricarboxylic acid cycle can be disrupted and iron-sulfur cluster proteins are downregulated, ultimately triggering cuproptosis. As both pyroptosis and cuproptosis are efficient ways to induce cell death, this study provides a novel way to realize effective tumor-targeted therapy based on H₂S-activated copper overload with simple Cu₂(PO₄)(OH) NPs.     

LS-DSP中串行分布式数字滤波器的功耗优化设计

采用一种优化阶符的二进制数据表示方法,达到了减小LS-DSP内串行分布式计算滤波器的动态功耗的目的.实验结果表明,该方法可有效减小LS-DSP内串行分布式计算滤波器10%的动态功耗.     

基于数字温度传感器TMP100的超低功耗射弹药温计设计

结合射弹发射药温度测量的实际需求,设计了超低功耗射弹药温计,给出了系统结构框图和软件流程,介绍了数字温度传感器TMP100和8引脚微控器PIC12F629,给出PIC12F629对TMP100的控制和数据读取过程,并介绍了系统的硬软件超低功耗设计.     

PATH: privacy-preserving auction for heterogeneous spectrum allocations

Recently, truthful spectrum auctions have been extensively studied to improve spectrum utilization. Furthermore, privacy preservation in truthful spectrum auctions has also been taken into account. However, existing work mainly focuses on privacy-preserving homogenous spectrum auctions, while the case of heterogeneous spectrum auctions is ignored. In this paper, we propose PATH, a privacy-preserving auction for single-sided heterogeneous spectrum allocations. Through organically combining three security techniques: homomorphic encryption, secret sharing and garbled circuit, PATH reveals nothing about buyers’ bids and identities beyond the auction outcome to any participant party. Specifically, PATH not only maintains the properties of truthfulness and spectrum reuse of the underlining auction mechanism TAMES, but also implements the first provably secure solution for single-sided heterogeneous spectrum auctions. Finally, experimental results demonstrate that PATH incurs only limited computation and communication overhead, and it is feasible for large-scale applications.

     

Hollow Engineering to Co@N-Doped Carbon Nanocages via Synergistic Protecting-Etching Strategy for Ultrahigh Microwave Absorption

Rational manipulation of hollow structure with uniform heterojunctions is evolving as an effective approach to meet the lightweight and high-performance microwave absorption for metal-organic frameworks (MOFs) derived absorbers. Herein, a new and controlled synergistic protecting-etching strategy is proposed to construct shelled ZIF-67 rhombic dodecahedral cages using tannic acid under theoretical guidance, then hollow Co@N-doped carbon nanocages with uniform heterojunctions and hierarchical micro-meso-macropores are obtained via a pyrolysis process, which addresses the shortcomings of using sacrificing templates or corrosive agents. The outer Co@N-doped carbon shell, composed of highly dispersive core-shell heterojunctions, possesses micro-mesopores while the inner hollow macroporous cavity endows the absorbers with lightweight characteristics. Accordingly, the maximum reflection loss is −60.6 dB at 2.4 mm and the absorption bandwidth reaches 5.1 GHz at 1.9 mm with 10 wt% filler loading, exhibiting superior specific reflection loss compared with the vast majority of previous MOFs derived absorbers. Furthermore, this synergistic protecting-etching strategy provides inspiration for precisely creating a hollow void inside other MOFs crystals and broadens the desirable candidates for lightweight and high-efficient microwave absorbers.     

环氧聚酯美术型粉末涂料及其防腐性能试验研究

通过多年来的批量生产实践,阐述了环氧聚酯美术粉末涂料的组成及其对原材料的要求和在电子测量仪器表面装饰的应用;并介绍其涂覆层经人工加速试验耐盐雾试验和耐湿热试验的结果,以及在各种气候条件下,经一年的天然暴露试验结果。