浅谈基于PLC智能型多能源共用热水器的PLC选型

文章介绍了PLC的选用原则,选型所选用的PLC应与相关工业领域有着应用广泛、成熟可靠的系统、PLC系统硬件、软件配置及功能应与装置规模和控制要求相适应。明确控制任务和范围,确定所需操作和动作,然后根据控制要求,估算输入输出点数、所需存储器容量,确定PLC功能、外部设备特性等,最后选择有较高性价比的PLC和设计了相应的控制系统。     

某体育场馆通讯电源系统的配置设计分析

结合某体育场馆通讯电源系统的配置设计实际情况,介绍了系统基础数据的选定,重点对蓄电池组设计、整流设备选择、逆变器选用、直流供电系统、逆变器供电系统等通讯电源系统的配置和设计过程进行了分析总结,并对电力线的选用提出了相关建议。     

选用和配置UPS时应注意的几个问题

随着计算机和网络的快速发展和广泛应用,ＵＰＳ市场已经进入了一个成熟阶段。如何去选择和配置ＵＰＳ已经成为用户最关心的问题。本文主要介绍了ＵＰＳ的功能和物理性能指标,指出了用户选用ＵＰＳ应注意的一些问题。     

VSAT在ISDN中的应用（下）

ＶＳＡＴ在ＩＳＤＮ中的应用（下）ＡｂｄｕｌＨａｍｉｄＲａｎａ等４综合ＩＳＤＮ结构和实施上一章确定了六种配置的潜在应用。综合地面／卫星的ＩＳＤＮ网络配置称作卫星链路ＩＳＤＮ通信（ＳＬＩＣ），选用来证明设想的实施。所以选用这种配置是由于许多公司和政府机构...     

浅议CA6140型普通车床电气控制系统的PLC改造

本文以CA6140型普通车床为例,将西门子802s base line控制系统应用到CA6140型机床的改造中,通过对控制系统中电源的选用、PLC接口设计、回参考点配置、主轴变频器的选用以及主控电路设计方面进行了阐述。     

DAM音响DSS系列产品

DAM产品重要配置为：小房间选用DAM最新DDS810产品，配置效果：低音强劲而有弹性，中音圆润，高音细腻富有穿透力，人声效果包围感强。中房间选用DDS860音箱，搭配效果：低音低沉而强劲，中音明亮，高音细腻富有穿透力，人声效果包围感特强。     

入侵检测系统的作用

介绍了什么叫IDS以及IDS的工作方式和他的选用及配置，并简要介绍了其应用。     

分析影响电能计量装置准确性的原因

本文阐述了正确选用优质的电能表与合理的配置电流互感器和电压互感器,对电能计量装置准确性的影响。     

色散补偿在G.652光纤传输系统中的应用

色散补偿光纤以其无源特性、全阶补偿以及插损小等优点,被广泛应用于光纤通信传输系统,但在实际应用中如何选用、配置色散补偿模块（DCM）,仍是工程技术人员需要系统思考的问题。文章系统分析了DCM的在G.652光纤系统中配置原则,并对每一种配置方案进行了对比阐述,解决了DCM在多种实际场景运用中的问题。     

TD-LTE海面超远距离覆盖研究与测试

为验证TD-LTE网络的覆盖能力,本文重点分析特殊参数配置（特殊子帧配置、Preamble格式）、天馈有效高度等对TD-LTE超远距离覆盖的影响,并结合频段选用、覆盖增强技术等对海面场景超远覆盖技术方案进行了深入探讨,依据实际测试情况进行分析和总结。     

A Necessary Condition on the Location of Pilot Tones for Maximizing the Correction Capacity in OFDM Systems

This paper presents a new view of the Bose-Chaudhuri-Hocquengem (BCH) code through the addition of some flexibility to the syndromes distribution in the transmitted sequence. In order to get this flexibility, we derive a necessary condition (NC) on the syndromes distribution for decoding BCH codes, which includes the already known Hartmann-Tzeng proposition. This NC is essentially deduced from the decoding process of BCH code, and is related to the locator polynomial and the requested constraints to guarantee a maximal error-correction capacity. The obtained results have the advantage to be applicable for any considered field (finite or not). Furthermore, we prove that when the correction capacity is equal to 2 or 3, the obtained NC becomes also sufficient. This result is very useful in some practical transmission systems such as orthogonal frequency-division multiplexing systems. Once the pilot tones considered in such systems verify the necessary and sufficient condition, it becomes possible to both reduce the peak-to-average-power rate and correct the impulse noise, present in such multicarrier systems. The usefulness of the presented analysis and the exploitation of the derived condition on the pilot tones distribution is illustrated by simulation results in the case of the Hiperlan2 system     

A Low-Cost Computer Numerical Control Machine system Using LSI Interfaces

The main disadvantage in a developing country for a dedicated microprocessor-controlled machine system is the sophistication of the ``special engineering' involved in these systems. For a small firm using conventional numerical control (NC) machines to implement such systems in-house (even in developed countries) these costs are considerably reduced by the use of personal computers to program LSI's in the NC mode.     

Performance analysis of Doppler shift effects on OFDM‐based and MC‐CDMA‐based cognitive radios

The present development of high data rate wireless applications has led to extra bandwidth demands. However, finding a new spectrum bandwidth to accommodate these applications and services is a challenging task because of the scarcity of spectrum resources. In fact, the spectrum is utilized inefficiently for conventional spectrum allocation, so Federal Communications Commission has proposed dynamic spectrum access mechanism in cognitive radio, where unlicensed users can opportunistically borrow unused licensed spectrum, which is a challenge to obtain contiguous frequency spectrum block. This also has a significant impact on multicarrier transmission systems such as orthogonal frequency division multiplexing (OFDM) and multicarrier code division multiple access (MC‐CDMA). As a solution, this paper develops non‐contiguous OFDM (NC‐OFDM) and non‐contiguous MC‐CDMA (NC‐MC‐CDMA) cognitive system. The implementation of NC‐OFDM and NC‐MC‐CDMA systems provides high data rate via a large number of non‐contiguous subcarriers without interfering with the existing transmissions. The system performance evaluates NC‐OFDM and NC‐MC‐CDMA for mobile scenario where each propagation path will experience Doppler frequency shift because of the relative motion between the transmitter and receiver. The simulation results of this paper proved that NC‐OFDM system is a superior candidate than NC‐MC‐CDMA system considering the mobility for cognitive users. Copyright © 2013 John Wiley & Sons, Ltd.     

中继蜂窝网络下行协作网络编码中继方法

In this paper, we first overview some traditional relaying technologies, and then pre-sent a Network Coding-Aware Cooperative Relaying (NC2R) scheme to improve the performance of downlink transmission for relay- aided cellular networks. Moreover, sys-tematic performance analysis and extensive simulations are performed for the proposed NC2R and traditional relaying and non-relaying schemes. The results show that NC2R outperforms conventional relaying and non-relaying schemes in terms of blocking probability and spectral efficiency, especially for cell-edge users. Additionally, the location selections for relays with NC2R are also dis-cussed. These results will provide some insights for incorporating network coding into next-generation broadband cellular relay mo-bile systems.     

Nanocellulose Aerogels for Supporting Iron Catalysts and In Situ Formation of Polyethylene Nanocomposites

Aerogels of nanocellulose (NC) prepared by freeze‐drying of cellulose nanofibrils (CNF) hydrogels and followed by impregnation with methylaluminoxane serve as nanoporous organic supports for immobilizing single site iron catalysts such as bisiminopyridine iron(II) complexes. The resulting catalyst systems, exploiting renewable biomaterials as organic supports, are highly active in low pressure ethylene polymerization. They afford simultaneous control of high density polyethylene (HDPE) particle morphology and facile NC dispersion within the HDPE matrix. In the early stage of ethylene polymerization, mesoscopic shape replication and NC‐mediated templating yield platelets containing an NC core and a HDPE shell, as confirmed by scanning electron microscopy (SEM) of virgin polyethylene powders. Opposite to conventionally dried CNF hydrogels, forming large agglomerates, this facile NC aerogel‐mediated in situ NC/HDPE nanocomposite formation is vastly superior to melt compounding of HDPE with NC, failing to produce such fine NC dispersions. On increasing NC content to 3.0 wt%, both Young's modulus (+50%) and tensile strength (+40%) increase at the expense of elongation at break (?80%). According to the SEM analysis of NC/HDPE morphology, the dispersion of NC nanosheets together with the in situ formation of “shish‐kebab” polyethylene fiber‐like structures accounted for HDPE matrix reinforcement.     

数控加工动态仿真系统中三维图形的开发

介绍了如何在数控加工动态仿真系统中使用Visual C 和OpenGL库开发三维图形应用程度，概述了建立VC＋＋和OpenGL库应用接口及进行图形开发的方法。     

A Biodegradable Antigen Nanocapsule Promotes Anti-Tumor Immunity via the cGAS-STING Pathway

Materials-based antigen delivery systems can augment the immune response by improving antigen uptake in antigen-presenting cells, targeting lymph nodes, prolonging antigen exposure, enhancing cross-presentation, etc. Recent research revealed that some antigen carriers activate the innate immune pathways without additional adjuvant. Here, a vaccine delivery platform (antigen nanocapsules) constructed by a one-step in situ polymerization is reported, weaving a biodegradable polymer network around the antigen surface. This simple technology allowed us to study the immunomodulatory effect of various antigen carriers. An antigen nanocapsule (NC7) capable of inducing dendritic cell activation and cross-presentation is identified. Further mechanistic studies revealed that NC7 activated the cGAS-STING pathway in a cGAS-dependent manner. Moreover, the subcutaneously injected NC7 accumulated in the lymph nodes and elicited strong cytotoxic T cell immunity and T cell memory against established cancer. Collectively, the often-neglected immunomodulatory effect of various cationic antigen carriers, enabling potential application in cancer vaccines, is uncovered.     

The development of a controller for mechatronics equipment

This paper describes the developmental history of mechatronics equipment controllers especially within Yaskawa Electric. First, the philosophy and definition of the word “mechatronics” are introduced. Then a discussion is presented about mechatronics equipment controllers in which they mean a numerical control (NC) system for machine tools and industrial robots. The NC system covers three fields of technology: controller hardware, software, and an actuator control system (servosystem). Second, the 20-year progress of each item is discussed. Finally, the necessary performance and functions for future NC systems are outlined     

Efficient network coding techniques for time constrained multicast narrowband power line communications

Nowadays, power line communication (PLC) technology is receiving a renewed attention in many application fields. In particular, PLC is quite attractive for what concerns novel paradigms as smart microgrid systems and smart buildings. This paper deals with a proposal of a PLC scheme that efficiently allows multicast services based on the use of an efficient network coding (NC) scheme. Furthermore, an analytical approach is outlined to pursue the performance optimization of the proposed solution. Finally, the good behavior of the proposed NC approach is highlighted by presenting performance comparisons with the classical NC alternative.     

Dynamic Nulling-and-Canceling for Efficient Near-ML Decoding of MIMO Systems

It is known that conventional nulling-and-canceling (NC) detection for multiple-input/multiple-output (MIMO) systems cannot exploit all of the available diversity, and, thus, its performance is significantly inferior to that of maximum likelihood (ML) detection. Conventional NC employs the layerwise postequalization signal-to-noise ratios (SNRs) as reliability measures for layer sorting. These SNRs are average quantities that do not depend on the received vector. In this paper, we propose the novel dynamic nulling-and-canceling (DNC) technique that uses approximate a posteriori probabilities as measures of layer reliability. The DNC technique is a minimum mean-square error (MMSE) nulling scheme combined with an improved "dynamic" layer sorting rule that exploits the information contained in the current received vector. We calculate the error probability of DNC for a simple special case and show that it is upper bounded by the error probability of conventional NC. Simulation results are presented for spatial multiplexing systems and for systems using linear dispersion codes. It is demonstrated that the DNC technique can yield near-ML performance for a wide range of system sizes and channel SNRs at a fraction of the computational complexity of the sphere-decoding algorithm for ML detection