基于模块迭代的火电厂热力系统建模研究

提出一种基于模块迭代的火电厂热力系统建模方法,逐个调用模块方程进行迭代计算,求解热力系统整体参数。该方法能够灵活实现系统建模,避免了联立方程求解法对初始值要求高的困难,对查找异常模块较为便捷,具有很强的实用性。针对某350 MW机组,基于设计数据建立设备参数模型,利用所提出的方法进行系统整体变工况计算。结果表明:该方法能够准确计算热力系统参数,验证了所提出方法的可靠性。

代发工资模块的制作及使用技巧

在银行利差不断缩小的今天 ,收费服务已成为银行利润新的增长点.据了解 ,2004年第一季度 ,银行中间业务增长迅速 ,工行境内分行实行业务收入 11.3亿元 ,同比增长 113%;农行 5.04亿元 ,同比增长了 63%;建行 13.06亿元 ,同比增长了 40.39%.代收代发作为一项不构成信用社表内资金、表外负债而形成信用社非利息收入的中间业务,已在我市农村信用社广泛展开了.经过一番摸索 ,笔者所在单位编写了一个代发工资模块 ,通过近半年来 3000多笔业务的试运行 ,一切正常.现将制作模块的方法和操作技巧写下来 ,以供大家参考.

二代大功率IGBT短路保护和有源钳位电路设计

通过分析IGBT的器件特性和短路特性,以瑞士CONCEPT公司最新推出的二代SCALE-2模块2SC0435T作为核心部件,设计了大功率IGBT的短路保护和有源钳位电路。

融合注意力特征及动态卷积的肺结节辅助诊断

针对肺结节关键影像征象信息不易获取,部分卷积神经网络(convolutional neural networks,CNN)模型对肺结节的识别率不高的问题,提出一种融合注意力特征的动态卷积残差网络(dynamic convolutional residual networks incorporating attention features,DcANet),并在有效实现肺结节良恶性分类的基础上对所提模型的诊断结果进行可视化分析。此网络以适应肺结节三维小尺寸输入特点的残差网络为基本框架,在DcABlock部分使用可以自适应调整卷积参数的动态卷积以及迭代注意特征融合模块,使模型能够更准确地获取肺结节信息,提高模型的表征能力。此外,还使用类激活映射将三维图像的各层切片进行可视化分析。实验在最终测试集上的准确率为85.87%,平衡F分数(F1)值为82.67%,敏感度和特异性的综合指标Gmean值为85.51%。实验结果表明:该网络可以提升对肺结节良恶性分类的准确性,诊断结果具有可信性,有一定的临床应用价值。

长安汽车 模块化开发与管理体系创建

自主品牌的模块化开发管理是循序渐进的系统化过程,它首先需要结合企业的设计能力、制造能力和采购供应链能力,科学合理地对整车架构、模块进行划分。重庆长安汽车股份有限公司(以下简称长安汽车)隶属于中国兵器装备集团有限公司,是中国汽车四大集团阵营企业之一。长安汽车针对产品自主研发过程中面临的进度、质量、成本的三重矛盾。

基于多注意力机制的生成对抗网络的遥感图像超分重建

针对现有超分辨算法重建后的遥感图像模糊,含有伪影和噪声等问题,提出一种基于多注意力机制的生成对抗网络。首先,在生成器的残差块中引入高效注意力机制,增强全局相关性,提高模型的特征提取能力;其次,利用迭代注意特征融合模块对输入的图像和经过生成器生成的高层语义特征图进行融合,代替长跳跃连接常用的相加操作,减少输入图像进行相加操作时导致的信息损失,使重建后的图像更加清晰;最后,基于WGAN网络优化模型训练,促进网络训练的稳定,加快损失函数的收敛。在不同数据集上验证上述方法,结果表明,相较次优算法,所提方法在峰值信噪比(PSNR)和结构相似度(SSIM)上分别提高了0.062~0.122 dB和0.03~0.08。

论机电一体化集成

本文从机电一体的发展得出集成是机电一体化的发展动力,然后阐述了机电一体化集成的理论基础和技术基础,在此基础上阐述了机电一体化集成的原理和方法,为以后研究集体化集成提供了科学研究方法。

软件技术专业中高职课程衔接模式的探析

针对目前软件技术专业中高职专业课程衔接过程中存在的课程设置、课程内容、教学方法等方面的问题,探讨如何采用"能力迭代,模块式结构"课程衔接模式,构建中高职一体化课程体系,并以程序设计课程为例,阐述一体化课程的设计与实施。

第二代模块化阵列式UPS——iTrust 2G系列UPS（续）

2．2第二代模块化阵列式UPS-iTmst 2G的工作原理针对第一代模块化、阵列式UPS所存在的两点不足：(1)因采用集中调控式的主、备监控模块方案而致使该监控模块有可能成为整个“N+X”型UPS冗余并机系统中的单点瓶颈隐患点。这是因为：一旦该模块出现故障，就无法对处于并联运行状态之下的电源模块执行输出电流的均流调控。严重时，可能会导致这种UPS并机系统的停电故障。

Strategic Height of Standards Arena

The article explains the meaning and its extreme importance of the strategic heights for the standardization field, deliberates over the challenges for traditional standardization, and proposes the urgency of the transformation towards modernized standardization. Affirming the limited role of existing methods like modularization and comprehensive standardization, the author insists on the necessity of accelerating the development of modernized standardization to meet the increasing demand of modern society towards standardization. It is a historical mission for current standardizers to focus on theories, methodologies and innovations in the modern standardization arena.

国内新闻——新品推介

整体螺杆机组在海尔工业园下线由海尔中央空调自主研发的整体式螺杆机组近日在青岛开发区海尔工业园顺利下线。该产品是专为工程用户设计的中央空调产品,其突出的特点是将冷却塔与主机完全融为一体,不仅省去了大型冷却塔费用,而且各类管路之间连接大大降低,既节省了费用,又将故障发生率降到了最低点,安装与日常保养也变的更加方便快捷。由于省去了冷却塔,水之间的热交换减少,可有效避免军团菌的滋生。另外,海尔整体式螺杆机组的蒸发温度在42℃以上,不适于军团菌35～40℃的生存环境,从而解决了冷水机组产生军团菌的弊端,使机组本身具备了健康功能。新飞研制采用“361&ordm运动杀菌”的双冠王冰箱近日。

Superderivation Algebras of Modular Lie Superalgebras of ■-Type

The authors consider a family of finite-dimensional Lie superalgebras of C-type over an algebraically closed field of characteristic p 〉 3. It is proved that the Lie superalgebras of C-type are simple and the spanning sets are determined. Then the spanning sets are employed to characterize the superderivation algebras of these Lie superalgebras. Finally, the associative forms are discussed and a comparison is made between these Lie superalgebras and other simple Lie superalgebras of Cartan type.

Indecomposable modules of the intermediate series over W(a,b)

For any complex parameters a and b,W(a,b)is the Lie algebra with basis{Li,Wi|i∈Z}and relations[Li,Lj]=(j i)Li+j,[Li,Wj]=(a+j+bi)Wi+j,[Wi,Wj]=0.In this paper,indecomposable modules of the intermediate series over W(a,b)are classified.It is also proved that an irreducible Harish-Chandra W(a,b)-module is either a highest/lowest weight module or a uniformly bounded module.Furthermore,if a∈/Q,an irreducible weight W(a,b)-module is simply a Vir-module with trivial actions of Wk’s.

Abelianness of the “missing part” from a sheaf category to a module category

This paper investigates the structure of the"missing part"from the category of coherent sheaves over a weighted projective line of weight type(2,2,n)to the category of finitely generated right modules on the associated canonical algebra.By constructing a t-structure in the stable category of the vector bundle category,we show that the"missing part"is equivalent to the heart of the t-structure,hence it is abelian.Moreover,it is equivalent to the category of finitely generated modules on the path algebra of type An-1.

On the character of certain tilting modules

Let G be a semisimple group over an algebraically closed field of characteristic p > 0. We give a(partly conjectural) closed formula for the character of many indecomposable tilting rational G-modules assuming that p is large.

Construction of Rota-Baxter algebras via Hopf module algebras

We propose the notion of Hopf module algebra and show that the projection onto the subspace of coinvariants is an idempotent Rota-Baxter operator of weight-1. We also provide a construction of Hopf module algebras by using Yetter-Drinfeld module algebras. As an application,we prove that the positive part of a quantum group admits idempotent Rota-Baxter algebra structures.

Some conjectures on modular representations of affine sl_2 and Virasoro algebra

We conjecture an explicit bound on the prime characteristic of a field, under which the Weyl modules of affine sl_2 and the minimal series modules of Virasoro algebra remain irreducible, and Goddard-Kent-Olive coset construction for affine sl_2 is valid.

Derived representation type and Gorenstein projective modules of an algebra under crossed product

Let H and its dual H* be finite dimensional semisimple Hopf algebras. In this paper, we firstly prove that the derived representation types of an algebra A and the crossed product algebra A#σH are coincident. This is an improvement of the conclusion about representation type of an algebra in Li and Zhang [Sci China Ser A, 2006, 50: 1-13]. Secondly, we give the relationship between Gorenstein projective modules over A and that over A#σH. Then, using this result, it is proven that A is a finite dimensional CM-finite Gorenstein algebra if and only if so is A#σH.

Restricting Specht modules of cyclotomic Hecke algebras

This paper proves that the restriction of a Specht module for a(degenerate or non-degenerate)cyclotomic Hecke algebra, or KLR(Khovanov-Lauda-Rouquier) algebra, of type A has a Specht filtration.

A Note on Restricted Representations of the Witt Superalgebras

Let F be an algebraically closed field of prime characteristic p>3,and W(n)the Witt superalgebra over F,which is the Lie superalgebra of superderivations of the Grassmann algebra in n indeterminates.The dimensions of simple atypical modules in the restricted supermodule category for W(n)are precisely calculated in this paper,and thereby the dimensions of all simple modules can be precisely given.Moreover,the restricted supermodule category for W(n)is proved to have one block.