面粉厂车间楼定向倾倒爆破

该楼体为框架结构,是车间楼和办公楼的结合体,由于加工面粉设备流程的需要,该楼同时承受动荷载和静荷载。楼体按照伸缩缝分为3部分,每部分的结构不相同,同部分不同层结构也各异。在爆破过程中严格控制各种参数,并采取有效的减振与防护措施,使此爆破工程在安全和质量上都达到了预期效果。     

多晶硅表面金属催化化学腐蚀法制绒研究现状

在多晶硅太阳能电池的生产过程中, 金刚线切割技术(Diamond wire sawn, DWS)具有切割速度快、精度高、原材料损耗少等优点, 受到了广泛关注。金刚线切割多晶硅表面形成的损伤层较浅, 与传统的酸腐蚀制绒技术无法匹配, 金属催化化学腐蚀法应运而生。金属催化化学腐蚀法制绒具有操作简单、结构可控且易形成高深宽比的绒面等优点, 具有广阔的应用前景。本文总结了不同类型的金属催化剂在制绒过程中的腐蚀机理及其形成的绒面结构, 深入分析和讨论了具有代表性的银、铜的单一及复合催化腐蚀过程及绒面结构和电池片性能。最后对金刚线切割多晶硅片表面的金属催化化学腐蚀法存在的问题进行了分析, 并展望了未来的研究方向。     

基于烟丝特性和卷制原理的卷烟机最佳回丝量计算模型

为确定卷烟机最佳回丝量,根据烟支卷制原理,结合烟支重量、规格、密度和平准盘凹槽规格、卷烟机吸丝道导轨规格等因素建立了卷烟机最佳回丝量计算模型。通过实例验证,该模型推算出的卷烟机回丝量是合适的,不仅能提供满足烟支质量要求的烟丝量,而且能最大程度减少因回丝量过大造成的烟丝造碎,降低烟支含末率,提升产品质量。该模型确定卷烟机最佳回丝量的方法实施方便,且不受卷烟机机型、烟支规格、原辅材料等因素限制,具有一般适用性。     

The Photomontage Activity of Postmodernism

For decades now, Douglas Crimp’s landmark 1980 essay ‘The Photographic Activity of Postmodernism’ has shaped our understanding of modernism’s aftermath, at least as it unfolded in North America and Western Europe. Less remembered, however, is the degree to which the procedures of disjunction, copying, appropriation, and outright theft that he highlighted were epitomised not just by contemporary photography, but by photomontage in particular. This article recovers the debates that led critics such as Crimp, Abigail Solomon-Godeau, Christopher Phillips, Benjamin Buchloh and others to turn to photomontage as one of their principal objects of concern in what became known as the postmodern critique of photography. Why was montage tasked to perform this critical function, particularly by people around the journal October who had not otherwise devoted the balance of their writing to photography’s history? The article suggests that these men and women, along with the contemporary artists they foregrounded, manifested what Mary Anne Doane has called a ‘desire for signification’, a reaction in the late 1970s against the mute theatricality of minimalist and conceptual art. Photomontage reintroduced representation to contemporary art and to the canon of art history. But unlike the reemerging illusionism in painting that also manifested this desire, montage guarded against an uncomplicated realism by highlighting and critiquing operations of representation in a manner that painting no longer could.     

安塞油田高含水油井化学堵水研究与现场应用

针对安塞油田高含水油井,重点开展了压裂、增注等措施,取得了较好效果,但存在单井费用高、有效率低、效果差异大等缺点。对此,有针对性的采取了化学堵水技术,对恢复高含水油井的正常产能,提高油井采出程度,改善油藏整体开发水平起着至关重要的作用。     

结合位图切割和区域合并的彩色图像分割

就经典分水岭图像分割算法中存在的过分割问题，提出一种结合位图切割和区域合并的彩色图像分割算法。对原始彩色图像通过空域梯度算子求其梯度图像，并利用位图切割重建梯度图像；对新梯度图像进行分水岭预分割；对预分割图像基于异质性最小原则进行区域合并，并获得最终分割结果。相比于现有的同类方法，该算法引入位图切割，抑制噪声对分割结果的影响，在边缘模糊处分割准确，得到符合人类视觉的较小分割区域数目，同时在运行效率上提高。     

埕岛油田馆陶组高含水期优势流动通道识别与应用

河流相沉积的砂岩油藏注水开发进入了高含水期,平面、层面矛盾进一步凸显,水驱效果差,识别和治理优势流动通道是开发中急需解决的问题。以埕岛油田主体馆陶组中一区油藏为例,综合采用指标计算法、吸水产液图版法、动态分析等方法对优势流动通道进行研究,形成了一套快速识别优势流动通道的综合评价方法;在流动通道识别基础上,明确调整方向,采取油水井两端并重的"提、控、引"治理措施,引导地下流场扩大波及面积,均衡流场,取得了良好的现场应用效果,对指导下步馆陶组注水开发具有重要的意义。     

特低渗透油藏产量变化规律及影响因素分析——以鄂尔多斯盆地定1780长1油藏为例

为了搞清影响定1780井区长1油藏产量变化的主要因素,针对产量和含水变化规律,结合油田的实际情况,综合考虑了地质因素和开发因素对产量的影响。运用单因素分析方法,深入研究了沉积微相、油层发育情况、注采井数比、注采比、井网形式、注水状况等因素对产量变化的影响程度。研究结果表明:①产量变化以递减型为主,反九点井网开发效果优于七点和五点井网;②含水与采出程度变化以近“S”形为主;③影响产量的主控因素为井网形式和注采比。该研究方法对类似油田产量变化规律分析具有一定的指导和借鉴意义。     

Discriminative graph convolution networks for hyperspectral image classification

Recently, the proposal of graph convolutional networks (GCN) has successfully implemented into hyperspectral image data representation and analysis. In spite of the great success, there are still several major challenges in hyperspectral image classification, including within-class diversity, and between-class similarity, which generally degenerate hyperspectral image classification performance. To address the problems, we propose a discriminative graph convolution networks (DGCN) for hyperspectral image classification. This method introduces the concepts of within-class scatter and between-class scatter, which respectively reflect the global geometric structure and discriminative information of the input space. The experimental results on the hyperspectral data sets show that the proposed method has good classification performance.