A simple analytical model to predict liquid unloading in the horizontal gas well

An accurate prediction of the critical gas velocity for the liquid loading is of great importance for operators to select the tubing diameter for the newly dril...     

基于BIM的地铁站安全设备信息族库构建与应用

地铁站具有空间较为密闭且人员相对密集的特征,为避免公共安全事故发生,构建地铁站安全设备信息族库并开展应用,有助于地铁站安全设备监管和维护。基于建筑信息模型(Building Information Modeling,BIM),建立地铁站安全设备信息族库构建流程,利用Revit,基于族的定义和类型,通过自建和加载标准构件族,实现地铁站安全设备信息族库建立;采用Microsoft Visual Studio C#进行Revit二次开发,以合肥市地铁3号线安徽大学磬苑校区站为例,展示地铁站三维模型,提取和管理安全设备信息。地铁站安全设备信息族库的构建和实施有助于实现地铁站安全设备的实时高效管理,对于地铁站的安全运营和监管具有重要意义。     

A Novel Robust Zero-Watermarking Algorithm for Audio Based on Sparse Representation

Behind the prevalence of multimedia tech-nology, digital copyright disputes are becoming in-creasingly serious. The digital watermarking pre-vention technique a...     

Nanoparticle–Cartilage Interaction: Pathology?Based Intra?articular Drug Delivery for Osteoarthritis Therapy

Osteoarthritis is the most prevalent chronic and debilitating joint disease, resulting in huge medical and socioeconomic burdens. Intra-articular administration...     

Four-channel CWDM transmitter chip based on thin-film lithium niobate platform

Multi-lane integrated transmitter chips are key components in future compact optical modules to realize high-speed optical interconnects. Thin-film lithium niobate (TFLN) photonics have emerged as a promising platform for achieving high-performance chip-scale optical systems. Combining a coarse wavelength-division multiplexing (CWDM) devices using fabrication-tolerant angled multimode interferometer structure and high-performance electro-optical modulators, we demonstrate monolithic on-chip four-channel CWDM transmitter on the TFLN platform for the first time. The four-channel CWDM transmitter enables high-speed transmissions of 100 Gb/s data rate per wavelength channel (i.e., an aggregated date rate of 400 Gb/s).     

铁饱和条件下铁与Fe2O3间的固相反应

采用扩散偶的方法,对铁与Fe₂O₃间的固相反应进行了研究,结果表明,两者间的产物层主要在Fe₂O₃一侧形成,而且与铁在空气中氧化不同,呈现出混合状结构;在铁饱和的条件下,Fe₂O₃转化的最终产物是Fe_xO(x<1)。     

广府地区传统建筑灰塑制作与修复工艺

灰塑是广府地区特有的一种传统建筑营造与装饰技艺。灰塑适合广府地区的气候特点,又因其制作成本较低,普遍使用在广府民居、祠堂,作为装饰,表达着人们对福寿安康、儿孙满堂等美好的盼望,同时起到一定保护建筑的作用。灰塑的制作工艺是广府地区长久以来人民智慧的结晶,不仅造型精美、题材广泛,还结合彩绘,为广府传统建筑增添了艳丽夺目而活泼的色彩,是岭南建筑技术与艺术结合的产物。     

基于VSE软件的矿井通风系统优化研究

针对大南湖一矿通风系统存在的问题,提出了四种优化方案,借助VSE软件对四种方案优化效果进行仿真分析.结果 表明,将三煤胶运大巷改造成回风巷,增加总进风量,可以解决回风大巷风速偏高、矿井局部微风等存在的问题,使得三煤胶运大巷完全定性,较好地满足了现场安全生产的需要.     

Input Structure Design for Structural Controllability of Complex Networks

This paper addresses the problem of the input design of large-scale complex networks. Two types of network components, redundant inaccessible strongly connected component (RISCC) and intermittent inaccessible strongly connected component (IISCC) are defined, and a subnetwork called a driver network is developed. Based on these, an efficient method is proposed to find the minimum number of controlled nodes to achieve structural complete controllability of a network, in the case that each input can act on multiple state nodes. The range of the number of input nodes to achieve minimal control, and the configuration method (the connection between the input nodes and the controlled nodes) are presented. All possible input solutions can be obtained by this method. Moreover, we give an example and some experiments on real-world networks to illustrate the effectiveness of the method.

     

圆口喷射器湍流流场数学模型及其最优设计

本文根据湍流射流和湍流边界层理论对圆喷嘴喷射器混合段湍流流场进行了研究,应用雷诺方程推导出喷射器混合段的基本方程和动量积分方程,用数学模型研究了喷射燃烧器,并对喷射器提出了一套最优设计公式。