《建设工程施工合同》中有关造价控制条款的阐析

仅从造价控制的角度分析、归纳施工合同中涉及费用的条款，以便更好地应用。     

CB-60/CB-70还原态重整催化剂的应用

介绍了福建炼油化工有限公司重整装置CB -60 /CB -70重整催化剂 (还原态 )分段组合装填的应用情况 ,列出了还原态催化剂和氧化态催化剂开工的不同特点。通过开工初期标定的数据与CB -6/CB -7催化剂的对比 ,说明CB -60 /CB -70催化剂有良好的活性和选择性 ,尤其是选择性、产氢率优于CB -6/CB -7,且使开工步骤得到了简化     

多因素线性模型在工程价款结算中的应用

工程造价与普通商品价格不同,其变动受到的影响因素较多,计算过程比较繁琐。文章主要通过对工程造价组成内容的研究分析,针对在建设项目管理过程中存在需要及时结算、快速报价等问题,提出了多因素线性模型的建立方法及应用。     

GIS中实时建立区域拓扑关系的快速算法

针对GIS中建立区域拓扑关系的实时性要求,论文提出一个结合基于图的拓扑信息和基于几何的左转算法的区域拓扑关系生成算法。利用区域的连通性提高了算法效率,左转算法保证了算法的可靠性。     

Facile synthesis of ordered nanocrystalline alumina thin films with tunable mesopore structures

Mesoporous alumina layers have attracted attention for their potential use in ultrafiltration of salts, as a heterogeneous catalyst support, an adsorbent in environmental cleanup, and in petroleum refinement. The ability to control the fast hydrolysis rate of the inorganic precursors using simple and inexpensive routes is important for that potential to be realized. Herein, we introduce a novel and facile route to synthesize mesoporous alumina thin films from the combination of inexpensive and commercially available copolymer with aluminum chloride or nitrate (salts) in an EtOH–surfactant–NH₃ · H₂O–salts (EsNs) system through the evaporation-induced self-assembly (EISA) method. Mesoporous alumina layers obtained utilizing the EsNs system have ordered and tunable pore structures. The ability to easily control the mesophases of the alumina layers within a short time provides distinct advantages over previously reported synthesis procedures. Most importantly, we demonstrate that the binding of surfactant and NH₃ · H₂O for the formation of hydrogen bond between them in the EsNs system controls the fast hydrolysis rate of the inorganic species. This allows for the synthesis of nanocrystalline alumina layers via the aluminum oxo-clusters’ assembly with the surfactant. Such simple route may be applied in the synthesis of other non-silica mesostructured oxides.     

成像光谱技术发展的科学背景和现状

本文分析与阐述了成像光谱技术发展的科学背景与现状。     

Steady-state modeling of resistive-gate MOSFETs

The Pao-Sah model for the long-channel MOSFET is generalized to include MOSFETs with resistive-gate electrodes (RG-MOSFETs). The RG-MOdSFETs current-voltage characteristics are studied using this extended Pao-Sah model. The steady-state operation of the RG-MOSFET can be divided into three regimes, separated by the uniform channel condition and the pinch-off condition, respectively. The regions of operation are discussed, and a simple analytical I-V expression is given for the device     

Synthesis of large building blocks for dendritic polyethers

Summary Building blocks containing multi-aryl ethers linkage in larger size for rapid building larger dendrimers were prepared with 3,5-di(4-hydroxyphenoxy)benzyl alcohol (1) as branch monomer and 1,3,5-tri(4-hydroxyphenoxy)benzene (2) as core molecule. Two generation of dendritic polyethers (12 and 15) were obtained by Fréchet convergent approach with 3,5-diphenoxybenzyl bromide (3) as starting molecule. They were characterized firstly by ¹H-NMR, ¹³C-NMR, and MS.     

实时跟踪控制系统中的数字滤波技术

在高精度的实时跟踪控制系统中，由探测器等其他一些因素给系统带来的噪声将不容忽视，数字滤波将是滤除噪声的有效手段，，由于系统实时性和采样频率的要求，本文介绍几种时跟踪系统中常用的数字滤波方法，并对它们在实时跟踪系统中的作用进行了和比较。     

激光对抗技术发展动态

激光对抗主要包括激光侦察告警、激光无源干扰和有源干扰，以及激光防护几方面。本文概述了激光对抗技术的发展。