出口技术复杂度“瘸腿”型深化与全球价值链分工地位——基于数据赋能的视角

基于WIOD2016数据库和全球价值链研究院的GVC指数,本文从出口技术复杂度中存在的“瘸腿”型深化现象出发,探究提升本土数字化水平、降低高技术中间品进口依赖对一国全球价值链分工地位的影响。研究发现,出口技术复杂度“瘸腿”型深化抑制GVC分工地位的提升,主要作用机制为制约资本和人力资本的积累;“瘸腿”型深化对中低收入国家具有更强的“低端锁定”效应,对中高知识密集度行业GVC分工地位的负面影响更大;数据赋能可有效减轻“瘸腿”型深化对GVC分工地位提升的抑制作用。据此,应加大对中高数字强度行业的资源倾斜,通过数据赋能改善出口技术复杂度“瘸腿”型深化,降低对高技术产业中间品的进口依赖程度,以提升价值链分工地位。

学校深化素质教育研究——以“新基础教育”学校转型性变革研究为例

＂新基础教育＂基于对当代中国社会转型特征的认识,提出了学校素质教育＂深化之型＂是要在学校整体形态、内在基质和日常教育实践中完成由＂近代型＂向＂现代型＂的转换;要将育人价值追求和思维方式改变之＂魂＂渗透和附着在学校整体、日常的教育教学实践之成事与成人关系统一的变革与发展之＂体＂中,从而促进学校中的＂人＂在日常的教育教学实践中实现素质提升、主动发展及生命自觉。

产业链全球化与欠发达地区经济发展路径研究

理论推导和演化模拟分析表明:在经济全球化浪潮的推动下,世界各国产业结构调整正在发生着从内敛型协调向外向型协调的重大转折,产业链全球化成为一种重要趋势,推动着各国由传统的产业间分工向着产业链垂直竞争与产业内平面网络型竞争格局发展。在这一时代背景下,纵向深化型经济与横向宽化型经济成为一种与产业链全球化紧密相关的经济发展新模式,在对欠发达地区形成强约束的同时,也为其经济快速发展提供了重要的战略实现路径。

出口技术复杂度“瘸腿”型深化与经济增长质量

本文在科学识别出口技术复杂度“瘸腿”型深化指数与经济增长质量的基础上,从多维度剖析其影响效应,并细致刻画“瘸腿”型深化的低端锁定效应。得到的结论主要有:(1)出口技术复杂度“瘸腿”型深化会对经济增长质量产生抑制效应,阻碍本土中间品技术复杂度提升和产业资本密集度深化是抑制效应实现的两个重要渠道。(2)出口技术复杂度“瘸腿”型深化对高技术复杂度中间品进口国具有低端锁定功能,会将后发国锁定于低质量、低国际分工地位、低生产率和低要素回报率的低端环节。(3)中国出口技术复杂度“瘸腿”型深化指数位居样本国前列,产业链与供应链自主可控能力和全球价值链关键节点型中间品的生产能力相对较弱。(4)中国的投入产出效率在样本国中处于较低位置,不仅表明“瘸腿”型深化对中国经济增长质量产生了非常强的抑制性,还表明提升经济增长质量和经济运行效率具有非常强的紧迫性。

BIM技术在机电安装工程中的应用

西安交通大学科技创新港3标段机电安装工程中,针对机电管线密集,工期紧,体量大等施工难点,确定在项目全生命周期应用BIM技术,在主体预留阶段、管道施工阶段和商务管理阶段取得了良好效果。

Modeling of miner track system during steering motion

Equipment for deep sea mining has risen from a position of virtual non-existence to a major industrial significance and in deep sea bed mining, the miner is the key equipment of the whole system that charges with the most complex and dangerous task.Evaluation of trafficability for tracked vehicles for deep sea mining is essential. Rare earth elements(REEs) are used in a wide range of modern applications. These applications are highly specific and substitutes are inferior or unknown. One possible source of the REE could be the poly-metallic nodule, at present explored in the tropical part of the Pacific Ocean. In developing miners of high performance, dynamic behaviour should be investigated under various traveling conditions. The mechanics of tracked vehicles is of continuing interest to organizations and agencies that specify design and operate tracked vehicles. Most works done are on the complete track vehicle system but in this work the research activity is aimed only at the track system with the basic aim of optimizing the track system design so that it can be manufactured by using the minimum resources. Equations and models are developed for the track system of a miner during steering motion. These equations and models could further be used for design optimization of the track system.

Implication of Geochemical Simulation for CO2 Storage Using Data of York Reservoir

In this paper, we build up a three-dimensional model for CO2 storage in the deep reservoir. And this paper gives the mathematical formalism of combined geochemical and multi-phase flow. The results give us the information about geochemical changing caused by CO2 injection into aqueous, the dissolution or precipitation of reservoir minerals caused by aqueous components change, the change of water density, also the differences between this model and the simulation model without considering geochemical. The basic data for simulation is from York Reservoir.

Comparison on construction of strut-and-tie models for reinforced concrete deep beams

With consideration of the differences between concrete and steel,three solutions using genetic evolutionary structural optimization algorithm were presented to automatically develop optimal strut-and-tie model for deep beams.In the finite element analysis of the first method,the concrete and steel rebar are modeled by a plane element and a bar element,respectively.In the second method,the concrete and steel are assigned to two different plane elements,whereas in the third method only one kind of plane element is used with no consideration of the differences of the two materials.A simply supported beam under two point loads was presented as an example to verify the validity of the three proposed methods.The results indicates that all the three methods can generate optimal strut-and-tie models and the third algorithm has powerful capability in searching more optimal results with less computational effort.The effectiveness of the proposed algorithm III has also been demonstrated by other two examples.

Magnetotelluric extremum boundary inversion based on different stabilizers and its application in a high radioactive waste repository site selection

Geophysical inversion under different stabilizers has different descriptions of the target body boundary,especially in complex geological structures.In this paper,we present an extremum boundary inversion algorithm based on different stabilizers for electrical interface recognition.Firstly,we use the smoothest and minimum-support stabilizing functional to study the applicability of adaptive regularization inversion algorithm.Then,an electrical interface recognition method based on different stabilizers is developed by introducing extremum boundary inversion algorithm.The testing shows that the adaptive regularization inversion method does work for different stabilizers and has a low dependence on the initial models.The ratio of the smooth and focusing upper and lower boundaries obtained using the extremum boundary inversion algorithm can clearly demarcate electrical interfaces.We apply the inversion algorithm to the magnetotelluric(MT)data collected from a preselected area of a high-level-waste clay-rock repository site in the Tamusu area.We recognized regional structures with smooth inversion and the local details with focusing inversion and determined the thickness of the target layer combined with the geological and drilling information,which meets the requirement for the site of the high-level waste clay-rock repository.

Analysis of Morphological Processes in a Disturbed Gravel-Bed River （Piave River）： Integration of LiDAR Data and Colour Bathymetry

The magnitude of river morphological changes are better analyzed through the use of quantitative approaches, wherein resolution accuracy and uncertainty assessment are treated as crucial key-factors. In this sense, the creation of precise DEMs （Digital Elevation Models） of rivers represents an affordable tool to analyze geomorphic variations and budgets, except for wetted areas, where reliable channel digitalization can normally be obtained only using expensive bathymetric surveys. The proposed work aims at improving channel surface models without having available bathymetric sensors, by deriving dry areas elevations from LiDAR data and water depth of wetted areas from aerial photos through a predictive depth-colour relationship. The methodology was applied to two different sub-reaches of the Piave River, a gravel-bed river which suffered severe flood events in 2010. Erosion and deposition patterns were identified through DEM differencing, showing a predominance of scour processes which can lead to channel instability situations. The bathymetric output was compared to other previously-derived models confirming the accuracy of the in-channel elevation estimates. Finally, a discussion on the role played by longitudinal protections during the studied flood events is proposed, focusing the attention on the incidence of two major bank erosions that removed significant volumes of stable areas.

EPC匠心工序Φ4280钢顶管与能源站地下室墙体连接部位的防渗漏水施工技术

EPC承包商团队科技创新,从设计源头改变传统设计套路。一般顶管工程常规设计均有始发井~接收井对应构成,在分析、比对地下室建筑结构及深基坑围护墙形式及所在地理位置、周边环境、地形地貌及钢顶管穿越毗邻新角浦河综合条件的基础上,决定选取南站利用其地下室结构空间、取代钢顶管施工接收井施工方法,实践解决结构地下室外墙洞口的新型防渗漏问题。

Simplified Model for Evaluation of VIV-induced Fatigue Damage of Deepwater Marine Risers

A simplified empirical model for fatigue analysis of deepwater marine risers due to vortex-induced vibration (VIV) in non-uniform current is presented. A simplified modal vibration equation is employed according to the characteristics of deepwater top tensioned risers. The response amplitude of each mode is determined by a balance between the energy feeding into the riser over the lock-in regions and the energy dissipated by the fluid damping over the remainder based on the data from self-excited oscillation and forced oscillation experiments of rigid cylinders. Multi-modal VIV fatigue loading is obtained by the square root of the sum of squares approach. Compared with previous works, this model can take fully account of the main intrinsic natures of VIV for low mass ratio structures on lock-in regions, added mass and nonlinear fluid damping. In addition, a closed form solution of fatigue damage is presented for the case of a riser with uniform mass and cross-section oscillating in a uniform flow. Fatigue analysis of a typical deepwater riser operating in Gulf of Mexico and West Africa shows that the current velocity profiles affect the riser’s fatigue life significantly and the most dangerous locations of the riser are also pointed out.