This paper is concerned with the hydroelastic problem of a very large pontoon-type floating structure(VLFS) edged with a pair of submerged horizontal plates, which is a combination of perforated and non-perforated pla...This paper is concerned with the hydroelastic problem of a very large pontoon-type floating structure(VLFS) edged with a pair of submerged horizontal plates, which is a combination of perforated and non-perforated plates attached to the for-end and back-end of the VLFS. For the hydroelastic analysis, the fluid is assumed to be ideal and its motion is irrotational so that a velocity potential exists. The VLFS is modeled as an elastic plate according to the classical thin plate theory. The fluid-structure interaction problem is separated into conventional hydrodynamics and structure dynamics by using modal expansion method in the frequency-domain. It involves, firstly, the deflection of the VLFS, which is expressed by a superposition of modal functions and corresponding modal amplitudes. Then the boundary element method is used to solve the integral equations of diffraction and radiation on the body surface for the velocity potential, whereas the vibration equation is solved by the Galerkin's method for modal amplitudes, and then the deflection is obtained by the sum of multiplying modal functions with modal amplitudes. This study examines the effects of the width and location of the non-perforated horizontal plates on the hydroelastic response of the VLFS, then the performance of perforated plates is investigated to reduce the motion near the fore-end of the VLFS. Considering the advantages and disadvantages of submerged plates without and with cylindrical holes, we propose a simple anti-motion device, which is a combination of a pair of perforated and non-perforated plates attached to the for-end and back-end of the VLFS. The effectiveness of this device in reducing the deformation and bending moment of the VLFS has been confirmed, and is compared with the results in cases without and with the submerged horizontal plates by the analysis in this paper.展开更多
The scalability of routing architectures for large networks is one of the biggest challenges that the Internet faces today.Greedy routing,in which each node is assigned a locator used as a distance metric,recently rec...The scalability of routing architectures for large networks is one of the biggest challenges that the Internet faces today.Greedy routing,in which each node is assigned a locator used as a distance metric,recently received increased attention from researchers and is considered as a potential solution for scalable routing.In this paper,LMD—a local minimum driven method is proposed to compute the topology-based locator.To eliminate the negative effect of the " quasi" greedy property—transfer routes longer than the shortest routes,a two-stage routing strategy is introduced,which combines the greedy routing with source routing.The greedy routing path discovered and compressed in the first stage is then used by the following source-routing stage.Through extensive evaluations,based on synthetic topologies as well as on a snapshot of the real Internet AS(autonomous system)topology,it is shown that LMD guarantees 100%delivery rate on large networks with low stretch.展开更多
Daqing is a mining city that was set up on wetland by exploiting and processing petroleum.This paper points out that net-group urban system is the optimization mode for Daqin g urban spatial structure through an alyzi...Daqing is a mining city that was set up on wetland by exploiting and processing petroleum.This paper points out that net-group urban system is the optimization mode for Daqin g urban spatial structure through an alyzing and appraising the present situation,c haracteristics,advantages and dis advantages of Daqing spatial structure.And the best way of optimizing Daqing urban spatial structure is to adopt sustainable development strategy,establish th e coordinated grade structure of urban system,con struct developed towns net system,p refect the function structure of the towns at all levels,make full use of resources an d strengthen environmental protection.Spatial structure of Daqing must be according-ly adjusted in order to adapt to the tr ansformation of future economy types and functions.Based on the foundation of keep-ing net group,the development shoul d be from disperse to moderate centra lization in order to give prominence to the multi-function of the central city.Constr ucting ruralizing city should be the future goal of Daqing City.展开更多
This paper describes the model speed and model In/Out （I/O） efficiency of the high-resolution atmospheric general circulation model FAMIL （Finite- volume Atmospheric Model of IAP/LASG） at the National Supercompute...This paper describes the model speed and model In/Out （I/O） efficiency of the high-resolution atmospheric general circulation model FAMIL （Finite- volume Atmospheric Model of IAP/LASG） at the National Supercomputer Center in Tianjin, China, on its Tianhe-lA supercomputer platform. A series of three- model-day simulations were carried out with standard Aqua Planet Experiment （APE） designed within FAMIL to obtain the time stamp for the calculation of model speed, simulation cost, and model 1/O efficiency. The results of the simulation demonstrate that FAMIL has remarkable scalability below 3456 and 6144 cores, and the lowest simulation costs are 1536 and 3456 cores for 12.5 km and 6.25 krn resolutions, respectively. Furthermore, FAMIL has excellent I/O scalability and an efficiency of more than 80% on 6 I/Os and more than 99% on 1536 I/Os.展开更多
Widespread hotels represent a new Italian phenomenon still not much investigated, both on theoretical and empirical side, which cannot be ignored anymore. Indeed they meet the need to implement techniques and manageme...Widespread hotels represent a new Italian phenomenon still not much investigated, both on theoretical and empirical side, which cannot be ignored anymore. Indeed they meet the need to implement techniques and management tools which are able to improve the culture-tourism binomial. This would permit to transform into valid instruments of national economical development, the shared declaration of intents for which culture and tourism, especially in Italy and in this particular fragile period, represent even more the main strategic levers for the sustainable development. This article intends to describe the potentiality of these widespread hotels as innovations particularly suitable with trends recently emerged in tourism sector and outline the phenomenon pattern in ltaly with particular attention on Umbria region, in order to identify his main strength and weakness and some innovation to improve performance. To this end, it starts from the analysis of the national and international economic-managerial literature concerning in particular cultural and experienced trends shown in tourism. Then it introduces the main acquisitions about widespread hotels in Italy, updating and extending them through a desk survey based on indirect sources of various natures. Lastly, it describes the case of Umbria, analyzing more in depth making use of interviews with entrepreneurs/managers of hotels and based on a semi-structured questionnaire. The aspects of indeterminateness which were found, starting from the normative one, testify how the potentiality of the widespread hotels as far as regards the value creation for the enterprise itself and the territorial stakeholder, are still not properly understood and therefore used. It is clear that, therefore, new behaviors are needed for entrepreneurs and, most importantly, for local policy makers in order to create the conditions for the full success of these hospitality models.展开更多
Currently,technology,human resources,economic development level and resource endowment determine the spatial layout of China's strategic emerging industries,whose development is dominated by large state-owned ente...Currently,technology,human resources,economic development level and resource endowment determine the spatial layout of China's strategic emerging industries,whose development is dominated by large state-owned enterprises and leading firms.Disparities in the layout of strategic emerging industries are limited for economically developed regions in China but significant for less developed regions.In this context,the Chinese government should be alarmed of repetitive development and excessive input of industrial resources;encourage the development of private capital and prevent the monopoly of state-owned enterprises;adopt a strategy of complementary advantages,and promote industrial relocation for the multi-tiered and non-equilibrium development of strategic emerging industries in China.展开更多
As the teacher education in China gradually evolves from the closed one into an open one,and with the greater pressure from the competition among universities,the transformation of normal universities is an inevitable...As the teacher education in China gradually evolves from the closed one into an open one,and with the greater pressure from the competition among universities,the transformation of normal universities is an inevitable choice.The problems that normal universities need to face up to are the proper goal orientation and the setting of appropriate development goals.Through the comparison and interpretation of the development goals of current normal universities in China,this paper finds similar tendency in the development types and the choices of features.Goal orientation is vital to the development of normal universities.Therefore,when setting and implementing development goals,a sound understanding about expressions like“the features of operating schools”and“comprehensive universities”should be improved,and a rational thinking about the fundamental questions should be engaged in as well.展开更多
基金the National Science Foundation for Creative Re-search Groups of China (Grant No.50921001) for supporting this work
文摘This paper is concerned with the hydroelastic problem of a very large pontoon-type floating structure(VLFS) edged with a pair of submerged horizontal plates, which is a combination of perforated and non-perforated plates attached to the for-end and back-end of the VLFS. For the hydroelastic analysis, the fluid is assumed to be ideal and its motion is irrotational so that a velocity potential exists. The VLFS is modeled as an elastic plate according to the classical thin plate theory. The fluid-structure interaction problem is separated into conventional hydrodynamics and structure dynamics by using modal expansion method in the frequency-domain. It involves, firstly, the deflection of the VLFS, which is expressed by a superposition of modal functions and corresponding modal amplitudes. Then the boundary element method is used to solve the integral equations of diffraction and radiation on the body surface for the velocity potential, whereas the vibration equation is solved by the Galerkin's method for modal amplitudes, and then the deflection is obtained by the sum of multiplying modal functions with modal amplitudes. This study examines the effects of the width and location of the non-perforated horizontal plates on the hydroelastic response of the VLFS, then the performance of perforated plates is investigated to reduce the motion near the fore-end of the VLFS. Considering the advantages and disadvantages of submerged plates without and with cylindrical holes, we propose a simple anti-motion device, which is a combination of a pair of perforated and non-perforated plates attached to the for-end and back-end of the VLFS. The effectiveness of this device in reducing the deformation and bending moment of the VLFS has been confirmed, and is compared with the results in cases without and with the submerged horizontal plates by the analysis in this paper.
基金Supported by the National High Technology Research and Development Program of China(No.2013AA013501)the National Program on Key Basic Research Project(No.2012CB315801)+1 种基金the National Natural Science Foundation of China(No.61133015)the Science and Technology on Information Transmission and Dissemination in Communication Networks Laboratory,CETC54
文摘The scalability of routing architectures for large networks is one of the biggest challenges that the Internet faces today.Greedy routing,in which each node is assigned a locator used as a distance metric,recently received increased attention from researchers and is considered as a potential solution for scalable routing.In this paper,LMD—a local minimum driven method is proposed to compute the topology-based locator.To eliminate the negative effect of the " quasi" greedy property—transfer routes longer than the shortest routes,a two-stage routing strategy is introduced,which combines the greedy routing with source routing.The greedy routing path discovered and compressed in the first stage is then used by the following source-routing stage.Through extensive evaluations,based on synthetic topologies as well as on a snapshot of the real Internet AS(autonomous system)topology,it is shown that LMD guarantees 100%delivery rate on large networks with low stretch.
文摘Daqing is a mining city that was set up on wetland by exploiting and processing petroleum.This paper points out that net-group urban system is the optimization mode for Daqin g urban spatial structure through an alyzing and appraising the present situation,c haracteristics,advantages and dis advantages of Daqing spatial structure.And the best way of optimizing Daqing urban spatial structure is to adopt sustainable development strategy,establish th e coordinated grade structure of urban system,con struct developed towns net system,p refect the function structure of the towns at all levels,make full use of resources an d strengthen environmental protection.Spatial structure of Daqing must be according-ly adjusted in order to adapt to the tr ansformation of future economy types and functions.Based on the foundation of keep-ing net group,the development shoul d be from disperse to moderate centra lization in order to give prominence to the multi-function of the central city.Constr ucting ruralizing city should be the future goal of Daqing City.
基金supported by the Strategic Priority Research Program of the Chinese Academy of Sciences (Grant No. XDA05110303)the National Basic Research Program of China (973Program, Grant Nos. 2012CB417203 and 2010CB950404)+1 种基金the National High Technology Research and Development Program of China (863 Program, Grant No. 2010AA012305)the National Natural Science Foundation of China (Grant No. 41023002)
文摘This paper describes the model speed and model In/Out （I/O） efficiency of the high-resolution atmospheric general circulation model FAMIL （Finite- volume Atmospheric Model of IAP/LASG） at the National Supercomputer Center in Tianjin, China, on its Tianhe-lA supercomputer platform. A series of three- model-day simulations were carried out with standard Aqua Planet Experiment （APE） designed within FAMIL to obtain the time stamp for the calculation of model speed, simulation cost, and model 1/O efficiency. The results of the simulation demonstrate that FAMIL has remarkable scalability below 3456 and 6144 cores, and the lowest simulation costs are 1536 and 3456 cores for 12.5 km and 6.25 krn resolutions, respectively. Furthermore, FAMIL has excellent I/O scalability and an efficiency of more than 80% on 6 I/Os and more than 99% on 1536 I/Os.
文摘Widespread hotels represent a new Italian phenomenon still not much investigated, both on theoretical and empirical side, which cannot be ignored anymore. Indeed they meet the need to implement techniques and management tools which are able to improve the culture-tourism binomial. This would permit to transform into valid instruments of national economical development, the shared declaration of intents for which culture and tourism, especially in Italy and in this particular fragile period, represent even more the main strategic levers for the sustainable development. This article intends to describe the potentiality of these widespread hotels as innovations particularly suitable with trends recently emerged in tourism sector and outline the phenomenon pattern in ltaly with particular attention on Umbria region, in order to identify his main strength and weakness and some innovation to improve performance. To this end, it starts from the analysis of the national and international economic-managerial literature concerning in particular cultural and experienced trends shown in tourism. Then it introduces the main acquisitions about widespread hotels in Italy, updating and extending them through a desk survey based on indirect sources of various natures. Lastly, it describes the case of Umbria, analyzing more in depth making use of interviews with entrepreneurs/managers of hotels and based on a semi-structured questionnaire. The aspects of indeterminateness which were found, starting from the normative one, testify how the potentiality of the widespread hotels as far as regards the value creation for the enterprise itself and the territorial stakeholder, are still not properly understood and therefore used. It is clear that, therefore, new behaviors are needed for entrepreneurs and, most importantly, for local policy makers in order to create the conditions for the full success of these hospitality models.
基金Supported by National Natural Science Foundation of China project "Spatial layout and development path of China's strategic emerging industries"(Grant No.71273276)
文摘Currently,technology,human resources,economic development level and resource endowment determine the spatial layout of China's strategic emerging industries,whose development is dominated by large state-owned enterprises and leading firms.Disparities in the layout of strategic emerging industries are limited for economically developed regions in China but significant for less developed regions.In this context,the Chinese government should be alarmed of repetitive development and excessive input of industrial resources;encourage the development of private capital and prevent the monopoly of state-owned enterprises;adopt a strategy of complementary advantages,and promote industrial relocation for the multi-tiered and non-equilibrium development of strategic emerging industries in China.
文摘As the teacher education in China gradually evolves from the closed one into an open one,and with the greater pressure from the competition among universities,the transformation of normal universities is an inevitable choice.The problems that normal universities need to face up to are the proper goal orientation and the setting of appropriate development goals.Through the comparison and interpretation of the development goals of current normal universities in China,this paper finds similar tendency in the development types and the choices of features.Goal orientation is vital to the development of normal universities.Therefore,when setting and implementing development goals,a sound understanding about expressions like“the features of operating schools”and“comprehensive universities”should be improved,and a rational thinking about the fundamental questions should be engaged in as well.
