因子分析法在湖北工业经济发展中的应用研究

因子分析法的基本目的是用少数几个因子去描述许多指标或因素之间的联系,以较少的几个因子反映原资料的大部分信息。本文以对湖北经济有较大影响的18个工业行业为分析重点,运用多元统计中的因子分析方法,从定量和定性分析相结合的角度对湖北工业行业的总体规模、企业营运能力、经济效益、偿债能力、财务风险等进行了因子分析,并在此基础上提出相关对策建议。     

温州产业升级优势和路径探讨

温州产业在严峻的国内外经济环境下,受到前所未有的冲击和考验,升级成为必然。在梳理产业升级相关理论的基础上,通过借鉴国外产业升级经验,分析了温州三产业升级优势,并探讨了温州三产业升级的路径,即逐步增大第三产业比重,实现第二产业向第三产业升级;促进现有产业向高附加值产业、新兴产业和高新技术产业转换;对企业内部进行改造升级,提升企业竞争力;对企业价值链环节进行升级。     

控制网络在济钢连铸机中的应用

济钢连铸机使用SIEMENS公司的S7系列PLC进行控制,系统中应用了工业以太网实现PLC与PLC之间的数据通讯,以及PLC与上位机的通讯;PROFIBUS_DP现场总线实现PLC与PLC,远程I/O及现场总线设备通信。     

基于C#的交流异步电机测试与分析系统开发

针对电机出厂前需进行测试分析这一情况,利用C#语言,开发了一套交流异步电机测试与分析系统。首先,介绍了系统总体结构;其次,给出了系统通讯设计,详细说明了西门子S7-1200PLC与上位机的以太网通讯,及与各测试仪表之间的RS485通讯的具体实现方式;然后根据国标GB/T1032-2012,开发了交流异步电机测试与分析系统,给出了系统功能和数据库设计方法;最后通过测试实例,说明了该系统的实用性和有效性。     

Motional relativity and industrial NMR sensors

We explore the implications of motional relativity in NMR and show that sample translation can be used to acquire NMR signals without the need for pulsed RF excitation or pulsed magnetic field gradients. Novel single-shot, on-line NMR acquisition protocols for samples being conveyed at high speed are discussed and preliminary results using a low-cost, on-line prototype NMR sensor are presented.     

基于西门子平台的工业以太网与PROFIBUS通讯机制应用的比较

本课题以工程实践中应用比较广泛的PROFIBUS-DP现场总线通讯机制和使用TCP/IP协议的工业以太网通讯机制作为研究对象,对两种通讯机制的稳定性和速度进行了测试比较。在课题的研究过程中,开发了一套测试软件;该软件可以分别在两种通讯机制下进行测试,然后进行数值分析。通过对数据的比较分析,发现采用西门子公司的PROFIBUS-DP通讯机制比采用以太网卡的通讯机制速度要快;在我们的测试平台下,PROFIBUS-DP在通讯速率较低时,其稳定性不如以太网好,但随着PROFIBUS-DP通讯速率的提高,其稳定性会随之增强。我们将这一比较结果成功应用于济南市烟草公司配送中心项目。     

Extraction Spectrophotometric Determination of Vanadium in Industrial Waste Water

A new and simple extraction spectrophotometric method for the determination of vanadium(V) with KIO₄, N‐phenylbenzohydroxamic acid (PBHA) and crystal violet (CV), in industrial waste water samples is described. It is based on the extraction of mixed‐ligand complex V(V)‐IO₄^? ‐PBHA‐CV⁺ into chloroform solution over 2‐7 MHC1. The molar absorptivity of the complex is (7.20) × 10³1 mol^?1 cm^?1 at λ_max 535 nm. The detection limit of the method is 44 μg 1^?1 V. The linearity of the calibration curve is followed up to 6 μgmL^?1 in the organic solution with slope, intercept and correlation coefficient of 1.34 × 10^?1, 6.7 × 10^?3 and +0.99, respectively. This method enhances the sensitivity of the conventional PBHA method for the determination of vanadium, and is free from interferences of other metal ions commonly associated with vanadium. The method has been successfully tested for the determination of V in the industrial waste water samples.     

Thermal transformation of quaternary compounds in NaF–CaF2–AlF3 system

Details of quaternary compounds formation in the system NaF–CaF₂–AlF₃ are specified. To achieve this aim, the samples of phases NaCaAlF₆ and Na₂Ca₃Al₂F₁₄ have been obtained by high-temperature solid-phase synthesis. Their thermal behavior when heated up to 800 °C has been studied using the methods of high-temperature X-ray diffraction (XRD) and thermal analysis (TA). The system under consideration can be regarded as a quasibinary section CaF₂–NaAlF₄, where at T=745–750 °C invariant equilibrium is implemented with the phases CaF₂–NaCaAlF₆–Na₂Ca₃Al₂F₁₄–(liquid melt)–(NaAlF₄). The peculiarity of the equilibrium is NaAlF₄ metastability at normal pressure. Below the equilibrium temperature the quaternary phase Na₂Ca₃Al₂F₁₄ is stable and NaCaAlF₆ above this temperature. The phase NaCaAlF₆ fixed by rapid quenching from high temperatures and when heated up to 640 °C decomposes, yielding Na₂Ca₃Al₂F₁₄. Further heating in vacuum at temperature up to 740 °C results in decomposition of Na₂Ca₃Al₂F₁₄ into CaF₂ and Na₃AlF₆. The expected reverse transformation of Na₂Ca₃Al₂F₁₄ into NaCaAlF₆ has not been observed under experimental conditions. Transformations in bulk samples reveal direct and reverse transformation of quaternary phases.

Synopsis

Thermal transformation of the quaternary compounds in system (NaF–CaF₂–AlF₃) was investigated using high-temperature X-ray diffraction (XRD) and thermal analysis (TA). In the system the invariant equilibrium is implemented with the phases CaF₂–NaCaAlF₆–Na₂Ca₃Al₂F₁₄–(liquid melt)–(NaAlF₄) at T=745–750 °C.     

火焰原子吸收光谱法测定工业废水中铅

研究了利用十二烷基磺酸钠(SDS)的增感作用,火焰原子吸收光谱法测定工业废水中微量铅。考察了各试验参数及共存元素对铅测定的影响,探讨了SDS增感机理。方法用于工厂废水中铅的测定,测定结果的相对标准偏差为0.8%~1.2%,检出限为0.11 mg.L-1,加标回收率为94%~104%。