500 kV杯形塔及“干”字塔的抗震性能分析

针对四川某500kV输电线路工程中代表性的杯形直线塔及"干"字形转角塔,利用钢结构分析设计软件STAAD建立梁桁混合模型,采用振型分解反应谱法进行不同地震水准、抗震设防烈度、场地类别下的动力特性和地震响应分析,对比研究非抗震和抗震两种情况下杆件的设计控制内力,分析地震作用对铁塔各杆件的影响程度,找出杯形塔及"干"字塔的薄弱部位,并针对薄弱部位采取加强措施。

风土环境与建筑形态下湖南省惜字塔建筑文化分析

惜字塔建筑作为明清时期文教建筑的典范,承载着民间“敬惜字纸”文化信仰记忆。笔者查阅相关史料文献,分析了湖南省惜字塔建筑形态由萌芽至程式化过程的人文性原因;通过实地走访和调研,并尝试从选址、平面、立面、材质与装饰等5个方面探析湖南省现存惜字塔建筑功能性的内在规律;揭示出明清儒家文化尊崇下的湖南省惜字塔的建筑形态与风土环境的内质作用关系,进而为研究承载“慎终追远”的湖湘文教建筑类型提供借鉴。

敬惜字纸文化信仰背景下的惜字塔建筑装饰纹理研究——以永州市新田县为例

惜字塔建筑装饰在文教建筑装饰纹理中独树一帜。经过多次实地调研对比湖南省各市县惜字塔装饰艺术发现,永州市新田县惜字塔最具典范性,本文以新田县19座惜字塔装饰纹理为例,分析总结此类构筑物装饰纹理的程式化内容,进而探寻文教类建筑装饰艺术图案的潜在内质规律,对史学资料和当代文教古建修复重现均具一定的研究价值和借鉴作用。

浅析基于“敬惜字纸”信仰的惜字塔建筑文化——以长沙市及其周边地区为例

惜字塔作为中华民族学术发展鼎盛时期的物质文化遗产,承载着明清时期民间敬惜字纸文化信仰的历史记忆。文化衍生建筑,建筑服务于文化。通过查阅大量相关史料文献,分析了惜字塔建筑得以萌芽成长与发展壮大深刻原因;通过走访和调研长沙市及周边地区的多处惜字塔,分析惜字塔建筑因文化特征而表现出的独特形态;揭示出“敬惜字纸”信仰所产生的惜字塔建筑文化。

自我赋能,构筑教师专业发展的素养“金字塔”

教师的专业发展是新时代赋予教师的光荣使命,是学校发展的现实需求,也是教师追求职业幸福感的自我诉求。本文以教师的自我发展为视角,主张教师的自我赋能,应坚持内外兼修的原则,秉持一个核心,强化三个意识,提升四个能力,构筑素养夯实、技能突出、德才兼备的专业素养“金字塔”。

干字塔绕跳线空气间隙台风下放电初析

1990年1-10月,我局220kV输电线路共跳闸15次,其中因干字塔绕跳线空气间隙在台风作用下击穿放电引起跳闸的事故有7次,占总跳闸次数的46.7%。现将某220kV输电线路26号耐张干字塔绕跳线空气间隙在6号台风作用下击穿放电事故的原因分析如下,供线路工作者参考。

木工字梁模板在超高超厚地下隧道中的应用

北京新机场轨道区超高超厚混凝土结构模板支撑体系采用定型木工字梁整体大模板综合施工技术,满足了模板的平整度要求,消除了混凝土表面蜂窝麻面、错台等质量通病,墙面达到清水混凝土标准且无裂缝,提高了施工效率、降低了深基坑施工环境的安全风险。

An algorithm supporting fast scheduling and viewing of remote sensing images in embedded devices

In order to resolve the conflict between the limited resources of embedded devices and the growing amount of massive image data to be shown, a solution for fast images rendering in embedded devices is proposed and implemented. First, an improved algorithm of a multi-resolution file-pyramid construction which is used for the organization of massive image data is presented. Then, a strategy, adopting technologies such as view-dependent levels of detail, target-tiles quick search and tiles seamless connection, is presented for fast scheduling and viewing of images. The results show that compared with the solution of multi-scale image representations based on wavelet, the proposed solution can improve the rendering speed, and the rendering speed does not depend on the image size, though it increases some data storage space. And the proposed solution is suitable for embedded devices and friendly experience.

新闻专业网络传播能力课程体系改革与探索

本文在分析高职新闻专业学生应具备的网络传播能力的基础上，探讨培养该能力的课程体系改革，提出“第一课堂、第二课堂＋导师制＋其他、相关课题集中训练”的“金字塔强化”课程体系。

Transition Features from Simplicity-Universality to Complexity-Diversification Under UHNTF

A large unified hybrid network model with a variable speed growth （LUHNM-VSG） is proposed as third model of the unified hybrid network theoretical framework （UHNTF）. A hybrid growth ratio vg of deterministic linking number to random linking number and variable speed growth index a are introduced in it. The main effects of vg and a on topological transition features of the LUHNM-VSC are revealed. For comparison with the other models, we construct a type of the network complexity pyramid with seven levels, in which from the bottom level-1 to the top level-7 of the pyramid simplicity-universality is increasing but complexity-diversity is decreasing. The transition relations between them depend on matching of four hybrid ratios （dr, fd, gr, vg）. Thus the most of network models can be investigated in the unification way via four hybrid ratios （dr, fd, gr, vg）. The LUHNM-VSG as the level-1 of the pyramid is much better and closer to description of real-world networks as well as has potential application.

Infrared Absorption and [CuO_5] Pyramid of High T_c Superconductor Bi-Sb-Sr-Ca-Cu-O System

The infrared absorption spectra of different superconducting phase of high Tc super conductor Bi-Sb-Sr-Ca-Cu-O have been measured . The results show that only in the range of 400cm-1 -700cm-1,there is a group of peaks which changes with different superconducting phases.According to group theory and infrared spectra of CuO, this group of peaks could be assigned to be the [CuO6]octahedron, the [CuO5] pyramid and the [CuO4]plane quadrilateral,but not CU-O plane or CU-O chain. Furthermore, the quasi-three dimensional Cu-O layers consisting of [CuO5] pyramids and proper coupling between them are essential factor for high Tc. It seems that the weaker compling of layers, the higher Tc

Neighborhood fusion-based hierarchical parallel feature pyramid network for object detection

In order to improve the detection accuracy of small objects,a neighborhood fusion-based hierarchical parallel feature pyramid network(NFPN)is proposed.Unlike the layer-by-layer structure adopted in the feature pyramid network(FPN)and deconvolutional single shot detector(DSSD),where the bottom layer of the feature pyramid network relies on the top layer,NFPN builds the feature pyramid network with no connections between the upper and lower layers.That is,it only fuses shallow features on similar scales.NFPN is highly portable and can be embedded in many models to further boost performance.Extensive experiments on PASCAL VOC 2007,2012,and COCO datasets demonstrate that the NFPN-based SSD without intricate tricks can exceed the DSSD model in terms of detection accuracy and inference speed,especially for small objects,e.g.,4%to 5%higher mAP(mean average precision)than SSD,and 2%to 3%higher mAP than DSSD.On VOC 2007 test set,the NFPN-based SSD with 300×300 input reaches 79.4%mAP at 34.6 frame/s,and the mAP can raise to 82.9%after using the multi-scale testing strategy.

Dune dynamics in the southern edge of Dunhuang Oasis and implications for the oasis protection

The survival of Dunhuang Oasis is largely determined by the evolution of sand dunes in the southern edge of the oasis, mainly composed of shield dunes and mega pyramid dunes, which occupy twothirds and one-third of the area, respectively. However, few studies have focused on dynamics of these dunes, especially in terms of quantification. So the theoretical basis of sand-control engineering is relatively limited. Here we present the characteristics of dune dynamics of a shield dune and mega pyramid dune in the southern edge of Dunhuang Oasis during April 2014-April 2016 based on measurement data of a 3-D laser scanner. Results indicate that the volume of the shield dune decreased during the monitoring period of two years, and the gravity centers of the monitored shield dune moved windward, indicating that sand was transported toward the oasis. Conversely, the dune volume of the mega pyramid dune increased and the gravity center presented no prominent movement, indicating that the megapyramid dune was relatively stable and its migration toward the oasis was not notable. Thus, compared with mega pyramid dunes, shield dunes in the southern edge of Dunhuang Oasis are identified as a more significant sand source endangering the protection of the oasis, and sand-control engineering should mainly focus on these shield dunes.

Interaction behavior recognition from multiple views

This paper proposed a novel multi-view interactive behavior recognition method based on local self-similarity descriptors and graph shared multi-task learning. First, we proposed the composite interactive feature representation which encodes both the spatial distribution of local motion of interest points and their contexts. Furthermore, local self-similarity descriptor represented by temporal-pyramid bag of words(BOW) was applied to decreasing the influence of observation angle change on recognition and retaining the temporal information. For the purpose of exploring latent correlation between different interactive behaviors from different views and retaining specific information of each behaviors, graph shared multi-task learning was used to learn the corresponding interactive behavior recognition model. Experiment results showed the effectiveness of the proposed method in comparison with other state-of-the-art methods on the public databases CASIA, i3Dpose dataset and self-built database for interactive behavior recognition.

Vehicle detection algorithm based on codebook and local binary patterns algorithms

Detecting the moving vehicles in jittering traffic scenes is a very difficult problem because of the complex environment.Only by the color features of the pixel or only by the texture features of image cannot establish a suitable background model for the moving vehicles. In order to solve this problem, the Gaussian pyramid layered algorithm is proposed, combining with the advantages of the Codebook algorithm and the Local binary patterns(LBP) algorithm. Firstly, the image pyramid is established to eliminate the noises generated by the camera shake. Then, codebook model and LBP model are constructed on the low-resolution level and the high-resolution level of Gaussian pyramid, respectively. At last, the final test results are obtained through a set of operations according to the spatial relations of pixels. The experimental results show that this algorithm can not only eliminate the noises effectively, but also save the calculating time with high detection sensitivity and high detection accuracy.

Pyramidal Structure of Chinese Publicly-Listed Private Firms:Motivations, Correlations and Paths to Governance

It is generally believed in academia that there are two theoretical explanations of tunneling and financing advantage for the creation of pyramidal structure. However, there is no definitive conclusion on which explanation holds sway. Based on non-equilibrium panel data of seven years between 2004 and 2010, this empirical study uses the product market competition variables of ＂inter-sector competition＂ and ＂intra-sector competition＂ and the hierarchy and complexity of pyramidal structure, examines the correlation between pyramidal structure of Chinese private manufacturing listed firms and product market competition and patterns of change, and reveals the major causes of pyramidal structure. Empirical result indicates that, for Chinese private manufacturing listed companies, there is a significant negative correlation between product market competition and the hierarchy and complexity of pyramidal structure, which indicates that the creation of pyramidal structure has a preference on tunneling by controlling shareholders. On the basis of further considerations on corporate tunneling and financing restraint categorization, high-tunneling firms and firms with low financing restraint demonstrate significant tunneling motivations; low-tunneling firms and firms with high financing restraint demonstrate significant effect of financing advantage, which further testifies both theoretical explanations for the creation of pyramidal structure. Conclusions of these studies have not only enriched and supplemented relevant studies on the root causes for the creation of pyramidal structure by Chinese private business groups, but provide practical support for firms to make correct and effective use of pyramidal structure as well.

Reasons Why the Great Pyramids of Giza Remain the Only Surviving Wonder of the Ancient World： Drawing Ideas from the Structure of the Giza Pyramids to Nuclear Power Plants

Selecting a site for a nuclear power plant requires extensive studies to ensure its safety and stability during its operation until its decommissioning. The 4,500-year old Egyptian pyramids at Giza are buildings to learn from. This paper tries to pin down the reasons for the survival of the Giza pyramids in order to reach a criterion for choosing sites for important buildings. It argues that the site selection and the geological properties of the area, being away from seismic effects,, floods and groundwater levels, the stability of the geometric form of the pyramid, the solidity of the structural engineering and precision of execution arguably are the reasons why the Great Pyramids of Giza are the only survivors of the seven wonders of the ancient world.

Applications of Inverted Pyramids Corroded by TMAH in PERL Silicon LED

In this paper, a novel and reliable structure of the side passivated emitter and the rear locallydiffused（PERL） silicon light emitting diodes （LEDs） is proposed. The inverted pyramids surface, the important interface in this structure, is given according to the experiment. The results show that the inverted pyramids surface has a low refection about 8%, in the anisotropic etching 70 ℃, 5% TMAH concentration, corrosion time of 90 min or 30 rain. Low refection means high light emitting rate. Most of the structure and manufacturing process can be compatible with planar CMOS technology, which makes the silicon LED greater potential for development in the future.

Assessment of Weathering of Construction Blocks and Mortar in Historical Monuments

Monitoring and assessment of monuments of cultural heritage is just a small part of all measures necessary for their protection and preservation. Many of these monuments are built of stone and the binder used to bond the construction blocks after a lengthy period of time loses its properties. The loss of binding material or changes in its properties substantially endangers the stability of the monuments thus constituting a menace not only for the visitors, but also for the conservation work. One of such monuments is the Step Pyramid of Djoser in Egypt. In this pyramid different artificial compositions are used as binder and its application in different areas of the pyramid is uneven and almost undistinguishable. Currently it is only possible to appraise the state of preservation of the mortar as a result of weathering process. This research allows identifying up to six weathering types and their intensities. This typology was developed on several sample areas verifying its validity in situ. Since there is no possibility to carry out direct instrumental measurements or take any samples, the classification developed is just empirical and not general. However, it provides relevant support for the development of conservation plans.

Typology and Dynamics of Financial-Industrial Groups Operating in the Czech Republic and Slovakia

The contribution of this paper is threefold. Firstly, it develops a typology of corporate group development in terms of the pattern of corporate group formation in the Czech Republic and Slovakia. It identifies briefly three important types of corporate groups--industrial groups （type I groups）, pyramid-like （type II） groups, and financial （type IIl or FIGs） groups. Using original typology for corporate groups, the paper examines development trajectory of some of the biggest FIGs and shows what effects their existence have in the two economies. Finally, some lessons resulting from this corporate group-related type of ownership concentration for other pre-transitive countries are mentioned.