试题库智能组卷中的模糊算法

根据课程教学大纲和用户命题要求，运用模糊算法进行量化处理，构成计算机随机抽题组卷的基本试卷模式。     

折流杆换热器的计算机辅助概念设计方法

通过对单程折流杆换热器的计算机自动布管方法进行研究,建立了布管设计的一些基本概念,并且给出了充分利用壳程结构特点进行自动布管的算法以及进行结构合理性检查的表达式。利用此结果,可采用计算机高级语言编程技术,建立单程折流杆换热器自动布管以及工艺、机械设计的软件,便于进一步的壳程结构概念设计与方案选择和评价。     

碳纤维自动生产线

正本发明涉及一种碳纤维自动生产线,包括纱架单元、烘烤单元、浸胶单元、拉挤成型单元、切割单元以及自动收料单元,自动收料单元包括收卷机构、码垛机构,收卷机构包括收卷机,收卷机上设置有用于夹紧料头的料头加紧部件、用于对料卷的侧部进行阻挡的侧定位部件以及用于对已进行收卷的料卷进行压紧的压紧轮组;码垛     

线速度达50m/min联塑研发出全自动收卷机

联塑机器公司最新研发的全自动收卷机,线速度达50m/min,并且能解决传统收卷机产生的一系列问题,实现设备自动换卷、自动切管、自动送管、自动夹管以及收卷完成后的自动包装,提高生产效率,减低劳动成本. LS全自动收卷机中间部分为A、B两个能互相自动换位的收卷盘.通过收卷机送管机构上的计长编码器测量所需收卷的管材的自动翻转换卷长度.当换卷长度到达时,伺候电机驱动换卷力臂顺时针方向进行自动翻转,当翻转角度到达180度后,翻转停止,此时现时收卷工位和预备收卷工位切换.     

管道腐蚀超声波内检测管壁自动测厚算法

管道腐蚀超声波内检测具有数据量大、干扰多的特点,其自动测厚算法要求适应性强,但各类超声波检测数据处理算法用于管道内检测自动测厚时存在误判率高、精度较低、耗时长等缺点。针对此问题,本文首先提出了基于两步法的一次FFT自动测厚算法;对其存在的误判率高的问题,提出了二次FFT自动测厚算法;对二次FFT算法精度降低的问题,提出了改进的二次FFT自动测厚算法。理论分析和各类实验证明,该算法具有一次FFT自动测厚算法精度高和二次FFT自动测厚算法误判率低的特点,较好地实现了管道腐蚀壁厚自动测量。     

双向拉伸PET薄膜生产线技术(续五)

<正>(一)双向拉伸PET薄膜生产工艺及设备2.7牵引及收卷薄膜经过横向拉伸后便进入牵引收卷工序,在此工序薄膜先后进行冷却、在线自动测厚、切边、电晕处理、张力控制和自动切割收卷等操作。     

文摘

带盖环式焙烧炉技术的发展方向;多元酚焦炭化料制取活性炭的研究;粉料的比例及纯度对阳极质量的影响;石油焦立式研磨机的性能及特点;一种阴极炭块组自动捣固机构的捣实机理及捣实方式的研究;配料配方计算机自动设定技术应用;[编者按]     

一种塑料膜生产自动除静电收卷系统

正本实用新型公开了一种塑料膜生产自动除静电收卷系统,包括支架,支架上部安装有纠偏辊,沿塑料膜运动方向的纠偏辊后端设置有静电器,静电器后端安装有过渡整理架;过渡整理架后端安装有牵引辊,牵引辊后端安装有收卷机;收卷机后端沿塑料膜     

注塑制品熔接痕的自动识别

通过对注塑模充模过程中熔接痕形成机理的数学分析，给出了一个结合流动模拟数值实现过程的熔接痕自动识别算法，结合计算机图形学知识，利用计算机自动实现了注塑成型中熔接痕的起始、发展和形成。该算法可预测复杂制件的熔接痕位置，并适用于气体辅助注射成型和反应注射成型。最后通过一个算例验证了该算法的实用性。     

带自动收卷功能的车窗玻璃密封橡胶条生产线

由重庆福信强橡塑制品有限公司申请的专利（公开号CN106346736A,公开日期2017-01—25）“带自动收卷功能的车窗玻璃密封橡胶条生产线”,涉及的密封条生产线包括挤出机、微波硫化机、表面喷涂机、热风硫化机、冷却装置、牵引机、废气处理装置以及自动收卷机构。其中微波硫化机和热风硫化机均设有自动灭火装置,能通过烟雾传感器检测微波硫化机和热风硫化机机壳内的烟雾浓度,当烟雾浓度达到设定值时表示出现橡胶条燃烧事故,第一控制器便立即控制第一水泵工作,通过高压喷头向机壳内喷水,实现快速自动灭火,生产安全性更高。该生产线实现了胶条的自动收卷,胶条收卷工作效率提高。     

Ultimate analysis of coals and cokes using instrumental techniques

This Paper describes instrumental techniques for the rapid determination of carbon, hydrogen, nitrogen, oxygen and sulphur. Two Perkin-Elmer Model 240 elemental micro-analysers were used, one for the direct determination of oxygen and the other for the simultaneous analysis for carbon, hydrogen and nitrogen. The Leco Automatic Sulphur Titrator was used for the sulphur assay. Accuracy and repeatability similar to that obtained by the classical methods described in the relevant British Standards were found, and data are presented to illustrate the comparison. Special aspects of developed procedures are emphasized which are essential for the attainment of good precision and accuracy.     

彩色PVC异型材用色母粒颜料性能的研究

采用混合研磨法制备彩色PVC异型材用色母粒颜料。测试了不同载体对彩色PVC异型材相溶性及不同浓度对颜色的影响,通过CIE颜色测色系统对彩色PVC异型材外观颜色进行表征。结果表明:选用氯醋树脂作载体时,能同生产PVC异型材的原料聚氯乙烯树脂混溶,达到彩色PVC异型材外观色泽均匀。     

Statistical approach to detergency evaluation. Correlation of performance data with gas chromatographic patterns of alkylbenzenes

The precision of a standardized detergency test based on the use of a Tergotometer and U.S. Test Cloth was found at a concentration of 0.4 and 0.5%. At these concentrations, the standard deviation was 0.56% soil removal units, and precision at a 95% confidence limit was±1.12% soil removal units. The detergency of some built spray-dried detergents was examined by this method and found to differ significantly, though chemical compositions were identical. Gas chromatographic analysis of the alkylbenzenes obtained by desulfonation of the alkylbenzene sulfonates indicated small structural variations which correlated with the observed variations in the detergency. Paper II in a series entitled Detergency Evaluations, presented at the meeting of the American Oil Chemists' Society, St. Louis, Missouri, May 1–3, 1961.     

Automatic Identification of the Parameters of Heat Plants

The proposed algorithm for operational identification of heat plant parameters executed during use makes it possible to correct adjustment of the temperature regulator (including self-adjustment) in consideration of the current state of the plant. Automatic identification will increase the quality indexes for temperature regulation and also the quality of the manufactured product.     

Intensification principle of a new three-phase catalytic slurry reactor. Part II: Eco-efficiency and techno-economic performances

In two papers, the concept and the performances of a new continuous intensified reactor named RAPTOR^® (French acronym for Reactor with Polyvalent Rectilinear Stirred Reactor with Optimised Transfer) are presented.Based on flow, heat and mass transfer characterisations and real hydrogenation experiments, Paper I presented a simple analytical model based on characteristic times that enables to explain the intensified performances compared with a semi-batch stirred reactor and to generalise the operability, rapidity and the flexibility of this minireactor. In Paper II (this article), the model is used to evaluate in a comparative study the eco-efficiency and the techno-economical advantages of a continuous process involving a RAPTOR^® versus a classical batch process equipped with a stirred reactor. Economical, environmental aspects are considered as well as productivity, safety and process control.     

Robust PSD determination of micro and meso-pore adsorbents via novel modified U curve method

Proper estimation of pore size distribution (PSD) for various solid adsorbents is essential for efficient characterization of such materials. PSD determination is inherently an ill-posed problem which can be solved by resorting to Tikhonov regularization technique. Automatic selection of the optimal regularization level is crucial for efficient extraction of PSD from experimental adsorption or condensation isotherms. A detailed comparison of Leave One Out Cross Validation, L-curve, U-curve and modified L-curve criteria are presented using several real adsorption and condensation case studies. A modified U-curve criterion is also proposed and its superior performances are thoroughly validated. The new method employs a relatively simple minimization procedure, which is much easier than quite complex and tedious procedures used by conventional methods to compute their internal optimum parameters. Other practical issues, such as efficient computation of L-corner have been received proper attention in this article and a simple algorithm is presented for this purpose.     

Necrodols: Anti-insectan terpenes from defensive secretion of carrion beetle (Necrodes surinamensis)

Two compounds recently isolated from the defensive gland ofNecrodes surinamensis, -and -necrodol, first representatives of a new category of monoterpenes (the necrodanes), are shown to be repellent to ants and other insects and irritating to cockroaches and flies. The compounds doubtless play a defensive role inNecrodes. The possible long-range applied significance of research on insect repellents is discussed.Paper No. 80 of the seriesDefense Mechanisms of Arthropods. Paper No. 79 is T. Eisner et al., Experientia 42:204–207 (1986).     

用废PET生产不饱和聚酯树脂

介绍由废ＰＥＴ合成不饱和聚酯树脂的工艺，并对树脂的性能进行了讨论。     

Convex constraint analysis: a natural deconvolution of circular dichroism curves of proteins

A new algorithm, called convex constraint analysis, has beendeveloped to deduce the chiral contribution of the common secondarystructures directly from experimental CD curves of a large numberof proteins. The analysis is based on CD data reported by YangJ.T., Wu,C.-S.C. and Martinez,H.M. [Methods Enzymol., 130, 208–269(1986)]. Application of the decomposition algorithm for simulatedprotein data sets resulted in component spectra [B(, i)] identicalto the originals and weights [C(i, k)] with excellent Pearsoncorrelation coefficients (R) [Chang,C.T., Wu,C.-S.C. and Yang,J.T.(1978) Anal. Biochem., 91,12–31]. Test runs were performedon sets of simulated protein spectra created by the Monte Carlotechnique using poly-L-lysine-based pure component spectra.The significant correlational coefficients (R >0.9) demonstratedthe high power of the algorithm. The algorithm, applied to globularprotein data, independent of X-ray data, revealed that the CDspectrum of a given protein is composed of at least four independentsources of chirality. Three of the computed component curvesshow remarkable resemblance to the CD spectra of known proteinsecondary structures. This approach yields a significant improvementin secondary structural evaluations when compared with previousmethods, as compared with X-ray data, and yields a realisticset of pure component spectra. The new method is a useful toolnot only in analyzing CD spectra of globular proteins but alsohas the potential for the analysis of integral membrane proteins.     

Metso to rebuild Stora Enso brown stock process

Under an €8 million order, Metso Paper will supply new brown stock process equipment for the Stora Enso Nymölla Mill in southern Sweden.Visit www.filtsep.com for the latest filtration industry news