针对中职计算机应用基础的分层教学实施的研究

本文旨在阐述中职学校的计算机应用基础的分层教学实施的研究,通过介绍分层教学的实现模式以及分层教学的基本原则,来阐述了中职计算机应用基础教学的学生分层、教学设计分层、教学实施分层以及学生评价分层四个方面的内容,从而最大限度地提升中职学生的计算机应用基础的能力和水平.     

解析计算机软件开发中分层技术的实践运用

首先阐述了分层技术的相关内涵,而后分析了分层技术的主要特点及其主要优势,而后分析了计算机软件开发中分层技术的主要应用,接着以具体实例分析了计算机软件开发中分层技术的具体应用,最后对分层技术未来的发展趋势进行了阐述,以期让分层技术在计算机软件开发中发挥更好的作用。     

计算机基础教学实施分层教学的研究

本文主要研究计算机基础教学实施分层教学,主要研究了学生对象和教学目标的分层,教学内容去耦合性整合的教学内容分层,教学方法选择的教学方式分层,从而提升职高学校计算机基础教学质量。     

基于FPGA的不可分层LDPC码译码器

针对不可分层LDPC码无法采用分层译码算法的问题,设计了一种新型的LDPC码分层译码器。与传统分层译码器的结构不同,新结构在各层间进行并行更新,各层内进行串行更新。通过保证在不同分层的同一变量节点不同时进行更新,达到分层译码算法分层递进更新的目标。选用Altera公司的CycloneⅢ系列EP3C120器件,实现码率3/4,码长8 192的(3,12)规则不可分层QC-LDPC码译码器的布局布线,在最大迭代次数为5次时,最高时钟频率可以达到45.44 MHz,吞吐量可以达到47.6 Mbps。     

计算机应用基础课程的分层教学实践

阐述计算机应用基础课程教学中的分层教学模式的应用策略,包括学生分层、教学目标分层、教学分层,在实践中利用线上学习模式的优势,引导学生基于网上学习提高效率和质量。     

塑封器件芯片与塑封料界面分层的研究

针对一款LQFP塑封器件,利用ANSYS有限软件建立了三维模型,根据断裂参数——J积分,讨论分析了芯片/塑封料界面的三种分层区域模型,得到了分层的主要扩展模型,即凸形分层区域,同时提出了一种分层扩展趋势的新模型,进而对凸形分层模型探讨了温度和裂纹半径对器件分层的影响。仿真数据表明,在极端低温或高温下,器件的分层区域容易扩展;而在一定的应力条件下,裂纹扩展的趋势会受到裂纹半径大小的影响。     

多点播送的分层编码视频

研究分层视频编码的多点播送，首先分析在多点播送应用中采用分层视频编码的必要性；然后总结了分层视频编码的各种技术特征；最后给出了接收机驱动的分层编码多点播送协议。     

聚酰亚胺吸水对挠性板分层的影响

本文详细研究了FPC生产中常用材料(PI补强、CVL、FCCL)的吸水率大小及特点。通过PI吸水对挠性线路板造成分层、爆板的影响试验,发现吸水是造成挠性板分层、爆板缺陷的主要原因之一,并总结出分层、爆板可分为两类情形:一类为PI在挠性线路板外层,吸水会造成热应力测试时分层,而将板烘干后,热应力288℃10s 5次也不会分层;二类是PI在挠性内层,多层压合前PI吸水会造成喷锡或热应力测试时分层,且烘板后再次测试也同样分层。通过研究发现分层是由于PI中水分受热迅速膨胀产生巨大压力造成的。而在多层板中由于铜层或刚性基材层的阻挡,PI吸收的水分残留在板内无法挥发,在喷锡或热应力测试时分层。最后提出了有关PI吸水造成挠性板分层的模型。     

界面分层造成的器件封装失效机理研究

文章通过C-SAM、X-RAY、SEM等对分层样品做了系统分析，发现了分层的机理以及分层对器件的破坏机理。研究表明：分层通常发生在芯片上部与包封材料接触的面，并有向整个芯片区域延伸的趋势；应力使交接面分层的同时也使芯片的钝化层损坏，而环境中的湿气会进入器件的包封并聚集在分层区，同时水气会通过损坏的钝化层进入下面的金属互连区，使互连发生短路而损坏器件。     

计算机软件开发中分层技术的应用解析

在当今社会,计算机的使用已经非常普及,为了满足人们日益增长的需求,计算机技术的水平不断提高,计算机软件的发展也呈现出各种趋势。其中,分层技术在软件开发工作中起着重要作用,对系统软件进行分层管理,有助于提高软件开发效率。因此,本文主要从分层技术的概念以及特点和具体应用分析介绍,希望提供分层技术在计算机软件开发的合理应用额有效参考,促进分层技术的广泛使用。     

基于一维波动方程重建层状介质声阻抗图的算法

本文基于一维波动方程,提出了一种层状介质声阻抗剖面的重建算法。它能定量地反演出各层状介质的声阻抗值及分层位置,以重建层状介质的声阻抗剖面图。通过计算机仿真实验和实际介质模块的声阻抗图重建实验,验证了该方法的有效性和实用性。     

DRA分层音频编码技术

提出了一种与DRA编码算法兼容的分层音频编码算法,其中环绕声分层编码采用了声道分类方式,而单声道/立体声分层编码则以残差再编码作为增强层的框架。分析和测试结果表明该DRA分层编码算法能够提供较好的声音质量,可作为信源编码与信道编码和分层调制技术完美结合应用于我国数字音频广播。     

浅谈分层技术在计算机软件开发中的应用

对计算机软件开发中分层技术进行了简单阐述,并对各类分层技术的发展与应用进行了介绍,最后结合实例对分层技术在计算机软件开发中的应用进行了探讨,以供参考。     

Intercalation‐Induced Tunable Stimuli‐Responsive Color‐Change Properties of Crystalline Organic Layered Compound

Layered structures accommodate guest molecules and ions in the interlayer space through intercalation. Organic layered compounds, such as layered polymers, have both intercalation and dynamic properties. Here intercalation‐induced tunable temperature‐ and mechanical‐stress‐responsive color‐change properties of crystalline layered polydiacetylene (PDA) as an organic layered compound are reported. In general, organic materials with stimuli responsivity are developed by molecular design and synthesis. In the present work, intercalation of guest metal cations in the layered PDA directs tuning of the stimuli‐responsive color‐change properties, such as color, responsivity, and reversibility. Whereas PDA without intercalation of metal ions distinctly changes the color from blue to red at the threshold temperature, the PDA with intercalation of the divalent metal ions (PDA‐M²⁺) shows a variety of color‐change properties. The present study indicates that intercalation has versatile potentials for functionalization of organic layered compounds.     

On The Origins of Silicate Dispersion in Polysiloxane/Layered‐Silicate Nanocomposites

We report the first multi‐system study of a layered‐silicate dispersion in polysiloxane/layered‐silicate nanocomposites. A variety of layered silicates (montmorillonite, synthetic fluoromica, laponite, and fluorohectorite) and cationic modifiers (single‐, twin‐, and triple‐tailed surfactants with tails of varying lengths and both primary and quaternary head‐groups) are combined to form organically modified layered silicates, which are then screened for compatibility with low‐molecular‐weight silanol‐terminated poly(dimethylsiloxane) (PDMS). Promising combinations are then selected and studied in greater depth with respect to both molecular weight and polysiloxane end‐group and substituent chemistry. We find that the PDMS backbone is generally incompatible with the layered silicates, regardless of modification type, and that dispersion in PDMS systems results from the presence of polar end‐groups, a result unprecedented in the field of polymer nanocomposites. We go on to quantify the substituent effect, not only with respect to end‐group chemistry, but taking into account changes in the polysiloxane backbone itself. For instance, in the absence of polar end‐groups we observe dispersion in the case of poly(methylphenylsiloxane) but not poly(3,3,3‐trifluoropropylmethylsiloxane). Finally, we apply a new epoxy/amine PDMS curing chemistry to PDMS‐nanocomposite production and show higher levels of layered‐silicate dispersion than observed in comparable silanol‐terminated PDMS‐based systems. Our findings serve as an indication of what is necessary to achieve a layered‐silicate dispersion in polysiloxane/layered‐silicate nanocomposites, and may indicate a more general approach for improving dispersion in systems where the polymer backbone is otherwise incompatible with the layered silicate.     

FPC分层板的耐弯折性研究

文章采用耐折性和耐挠曲性两种试验方法,分析了典型规格的分层板应用于折叠式手机和滑盖手机中的耐弯性,证实了分层板良好的耐弯折性可靠性,并提出进一步提高分层板耐弯折性的设计思路。     

Achieving inter-session fairness for layered video multicast

The Internet is increasingly used to deliver multimedia services. Since there are heterogeneous receivers and changing network conditions, it has been proposed to use adaptive rate control techniques such as layered video multicast to adjust the video traffic according to the available Internet resources. A problem of layered video multicast is that it is unable to provide fair bandwidth sharing between competing video sessions. We propose two schemes, layered video multicast with congestion sensitivity and adaptive join-timer (LVMCA) and layered video multicast with priority dropping (LVMPD), to achieve inter-session fairness for layered video multicast. Receiver-driven layered multicast (RLM), layer-based congestion sensitivity, LVMCA, and LVMPD are simulated and compared. Results show both proposed schemes, especially LVMPD, are fairer and have shorter convergence time than the other two schemes.     

Layered space-time multiuser detection over wireless uplink systems

In this paper, we investigate the use of layered space-time (also known as the vertical Bell Laboratories layered space-time (V-BLAST) scheme) for multiuser detection in fading channels. The multiple transmit antennas in V-BLAST are treated as individual mobile station transmitters, while the base station consists of multiple receive antennas. In the proposed system, users are organized in groups and allocated a unique spreading code within the same group. Using these codes, we are able to separate the different groups, and layered space-time algorithm is then invoked to further remove the remaining interference between users. A decorrelator-type receiver-based layered space-time detection is proposed for both complex and real constellations. For the latter case, we derive our receiver after evaluating and comparing the performance of two decorrelators based on the V-BLAST scheme. It is demonstrated that a significant performance improvement and increase in system capacity is obtained with very low spreading factors. Further results are also introduced by considering reduced complexity receivers based on serial layered space-time group multiuser detection, and parallel layered space-time group multiuser detection.     

电波在有耗分层媒质中传播的频域特性研究

本文在频率域上研究了电波在分层媒质中的传播特性，提出了一种新的电波在有耗分层媒质中的传播的频域模型，利用计算机仿真分析了电波在层状媒质中的传播的频率特性，得出了各介质参数及电波频率与传播持性的关系。     

Layered Materials in the Magnesium Ion Batteries: Development History,Materials Structure,and Energy Storage Mechanism

Layered crystal materials have blazed a promising trail in the design and optimization of electrodes for magnesium ion batteries (MIBs). The layered crystal materials effectively improve the migration kinetics of the Mg²⁺ storage process to deliver a high energy and power density. To meet the future demand for high-performance MIBs, significant work has been applied to layered crystal materials, including crystal modification, mechanism investigation, and micro/nanostructure design. Herein, this review presents a comprehensive overview of layered crystal materials applied to MIBs, from development history to current applications. It focuses on the relationship between the layered crystal structure and the energy storage mechanism. Meanwhile, recent achievements in the design principles of layered crystal materials and their application to electrodes are summarized. Finally, future perspectives on the application of layered materials in MIBs are presented. The overview of the development process and structural characteristics contributes to a thorough understanding of these materials, while a discussion of design strategies and practical applications can inspire further research. Therefore, this review provides guidance and assistance for constructing high-performance MIBs.