基于线性码上无可信第三方的多秘密共享方案

为了避免秘密共享方案中第三方的不诚实行为造成的威胁,利用Massey线性码上的秘密共享体制,提出了一个无可信第三方的多秘密共享方案。该方案的重构算法满足加法同态性,其中每个参与方既是参与者也是分发者。同时方案实现了非门限结构上的无分发者的秘密共享,适用于更广泛的存取结构。证明了方案的正确性和安全性,并通过效率分析表明该方案只需较小的存储空间。此外,基于方案中重构算法的同态性给出了一种设计安全多方计算协议的方法。     

径向充磁表贴式正弦磁极电机转矩密度最大化研究

本文提出一种利用三次谐波削极,增加径向充磁表贴式正弦磁极永磁同步电机输出转矩而不增加转矩脉动的方法。根据永磁磁极形状可以将表贴式永磁电机分为弧形永磁磁极和面包形永磁磁极。对于所有极槽配合的径向充磁弧形永磁磁极永磁电机,注入最优三次谐波幅值为基波的1/6;但对于径向充磁面包形永磁磁极永磁电机,最优三次谐波幅值随极对数（P）、永磁体厚度和转子半径而变化,因此现有推导的最优三次谐波解析模型是不准确的,对于面包形永磁磁极永磁电机,此模型是无效的。本文推导了径向充磁面包形表贴式正弦磁极注入最优三次谐波幅值解析模型,可以在不提高转矩脉动的情况下最大程度的提高转矩。最后用有限元验证了模型的准确性。     

IT时代的第三种文化产业机遇

人类社会一直存在着并行不悖的科技与人文的两种文化与文化产业。如今,出现了第三种文化与第三种文化产业。第三种文化产业的思想基础是图灵的可计算原理;其物质基础是微处理器智力内核。第三种文化产业将打破两种文化产业界线,用人工智能与智能化工具等现代科技手段,实现人文文化领域中的艺术创作,这是人类文化领域中已经开始的没有硝烟的产业战争。     

校园信息化建设中E卡通系统的安全配置

苏州全市中小学已经普遍使用教育E卡通,它不仅满足于校园信息化的建设,而且充当了公交卡、借书卡、园林卡等其他第三方功能的应用,随之接口应用应运而生。它让两者不能通用的系统,有机地结合到一起,达到共赢的目的。     

Liquid crystal polyarylates containing 2,6-naphthalene dicarbonyl group (I): Effects of kinky monomers on thermal and anisotropic behaviors

A series of copolyarylates primarily based upon 2,6-naphthalene dicarboxylic acid, hydroxybenzoic acid and 4,4-biphenol were prepared by slurry-melt polymerization with Santotherm 66 as a heat exchange medium. The frequently used kinky monomer, resorcinol or isophthalic acid, was introduced into these copolyarylates to modify the chemical strcture. The relationship of the thermal behavior and the crystalline structures for these copolymers was studied by means of DSC and wide angle X-rays diffraction. The amount of mcorporated kinky modifier was found to produce a significant effect on the liquid crystalline phase and the melting temperature of the copolyarylates. All of these liquid crystal polymers exhibited nematic textures; shreaded and/or Schlieren type, depending upon the incorporated kinky monomer. The liquid crystal polymers modified by isophthalic acid (up to 40 mole % of 2,6-naphthalene dicarboxylic acid replaced by isophthalic acid) possessed shreaded texture however high the temperatures of the polymer melts were. The liquid crystal polymers modified by resorcinol (60 to 100 mole % of 4, 4-biphenol replaced by resorcinol), however, would have two types of nematic textures: the shreaded texture occurred when the temperature of the polymer melt was between the melting temperature and the anisotropic transition temperature; the Schlieren texture existed when the temperature of the polymer melt was high above the anisotropic transition temperature. The Schlieren texture formed only when a liquid crystal polymer revealed good flowability and lower rigidity. The polydomain concepts could be utilized to explain the observed textures of these copolyarylates clearly.     

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.     

Electrochemical deposition of polypyrrole–carbon nanotube films using steroid dispersants

Polypyrrole (PPR)–carbon nanotube (CNT) films were prepared by an electrodeposition method, combining PPR electropolymerization and anaphoresis of CNT. PPR polymerization experiments showed advantages of a dopant from the catechol family for the deposition of PPR films at reduced electrode potentials. The method allowed the formation of adherent films on stainless steel substrates. The amphiphilic molecules with steroid-like structures, such as carbenoxolone disodium salt, glycyrrhizic acid, ammonium salt, and sodium taurodeoxycholate, were used for dispersion and charging of CNT. The new dispersing agents showed outstanding dispersion ability. In addition to dispersing properties, electrodeposition experiments revealed film-forming properties of carbenoxolone and ability to form pure carbenoxolone or carbenoxolone–CNT films. The PPR–CNT films formed using carbenoxolone disodium salt, glycyrrhizic acid ammonium salt, and sodium taurodeoxycholate showed diverse microstructural features. The dispersion and deposition mechanisms were discussed.     

碳中和目标背景下包装行业发展的对策

目的 为了应对日益恶化的全球气候变化,并实现碳中和的目标,研究低碳化技术在包装行业的应用成为当下至关重要的任务。为了推动包装行业在碳中和背景下的低碳化转型,有必要对现有的低碳化技术进行分类和梳理。方法 从碳减排和碳移除两方面对包装行业已有的低碳化技术进行了研究。综述当前可降解生物塑料和聚合物单体化学循环技术在包装中的应用,介绍了几种清洁能源以及碳捕捉、碳利用和碳储存技术的发展现状。结论 对包装行业而言,实现碳中和的目标还面临着很多挑战。包装行业在推进碳中和目标时要选取与发展适合的低碳能源和碳中和技术。     

第三方支付现状分析与发展对策

文章针对第三方支付行业飞速发展而国内对于第三方支付领域监管滞后的现状进行了分析,刚出台的《非金融机构支付服务管理办法》明确了第三方支付非金融机构支付服务方的市场地位,加强了对于第三方支付的风险管理,但在很多方面仍有不足,使第三方支付的发展面临很多风险。对于第三方支付的监管不足,尤其是对于消费者保护力度的不足,制约着第三方支付的进一步发展。     

第三方服务培训市场现状浅析

我国的第三方服务发展速度迅猛,但是第三方服务的质量仍需不断提高,为此大力加强第三方服务业的培训就显得尤为迫切。本文通过对我国第三方服务产业中的测试、监理、评估、认证四个方面的培训历史、国家政策、培训机构、人员结构、竞争态势等的简单分析,使我们对我国第三方服务的培训市场有一个概要的了解,从而为我们第三方培训业务的开展提供更好的市场参考,以促进我国第三方服务产业的发展,为我国各个产业的发展与升级提供动力与支持。