钢板表面缺陷检测光学系统的设计

为满足钢板表面缺陷在线检测系统宽幅面、高速、高分辨率的检测要求,优化设计了钢板表面缺陷视觉检测系统的光学部分。采用了一种新型LED线光源获得高强度均匀照明,多线阵CCD拼接成像完成幅面分割。明、暗域相结合的成像模式确保了大部分缺陷的有效检出。综合考虑光源、镜头与线阵CCD的影响,计算并优化选取了光学镜头的焦距、f数和视场角等参数以满足检测需要,整个光学系统设计满足在线检测需要并在样机中得以应用。

CLOBAL CHARM OF THE CHANGJIANG RIVER DELTA

Based on the theory of geo-economy,under the new situation of global economy,information network and China’s entry into WTO,also with the holding of APEC (in 2001) and the International Exposition in the near future,the Changjiang (Yangtze) River Delta is striding toward the spectacular international multi-polar situation and becomes one of core regions with high-speed development. Facing the ocean and world all along,leading the progressive tides of the age and scintillating the splendor of the nation,she does advance with time. Through a long period of irrigation projects construction and intensive operation of lands in previous agricultural society,the artificial wetland ecosystem with a positive cycle had ever been formed in this region. At present,environmental pollution and urban expansion resulted from post-industrialization are being rectified. The delta will be the paradigm of industrial and agricultural modernization along the sustainable development road. With the rapid development of urbanization,she has been one of the regions with the highest density population and high urbanization level. Taking the Changjiang River estuary and the Hangzhou Bay as two parts,she is continuously strengthening and adjusting her interior structure,expanding mothball space and constructing the oriental modern "logistics center" to link the whole world. The butterfly-style urban system of the Changjiang River Delta is flying,probably engendering earthshaking "butterfly effect".

Sandwich-Course Training in Higher Education as a Major Strategic Thrust Regional Policy of Professional Training： Lessons Learned From the Pioneering Example of the University Institute of Technology Corsica

Corsica is an island economy marked by the complete absence of any of the big holdings and multinationals that fuel and forge the worldwide economy. Equally absent is any of the kind of medium-sized enterprises servicing big business that have spearheaded local economies in other regions like Lombardy. Corsica＇s economic fabric is essentially made up of small and home businesses, farm smallholdings, artisans, and small-scale retail. Given how public-sector capital investment is already hypertrophied, a policy of investment in human capital could be a compelling new opportunity to trigger a dynamic regional development impetus. Leading the way, the University Institute of Technology Corsica, Corsica University＇s affiliated school of applied vocational technologies, is demonstrating its ability to act as a structurally engaged facilitator of island-wide spatial planning and regional branding. As a founding pillar in pioneering the emergence of a sandwich-course training system in higher education in Corsica, in 2010 the university made its entire training curriculum fully accessible to all through the signature of apprenticeship training or vocational qualifications agreements. This grass-roots programme is the outcome of a committed core strategy to develop partnerships with the island＇s key social and economic communities （businesses, community groups, and local authorities）, and it plays a fundamental role in shaping and selling the most vital valued assets that typify a regional territory emerging into a structured destination-brand identity （simultaneous growth in the employability and quality of school-to-work transition shown by its human capital, mass shift in the degree of skill acquisition directly tied to the regional territory＇s own organic needs, fluidity of knowledge transfer fully controlled through sandwich placements, deep sustainable entrepreneurship education etc.）. After highlighting the specific features of the sandwich training policy development process in Corsica as a shaper of the Regional Vocational Development Programme, this paper brings an analysis of the lessons learned from the pioneering example of the University Institute of Technology Corsica as a dynamic engineer of structured future and regional brand for Corsica.

Permutation-substitution image encryption scheme based on a modified chaotic map in transform domain

A new chaotic image encryption scheme based on permutation and substitution in the Fourier domain is presented.Fractional Fourier Transform(FRFT)is used before the encryption scheme to get a large degree of randomization.The permutation is achieved by Baker map and the substitution by a key-related-to-plain-image algorithm based on the modified Logistic map.Modification of the Logistic map is developed to increase the space of the encryption key,and hence increase the security.The key of the encryption algorithm dependents on the plain image,and thus,the cipher image is sensitive to both the initial key and the plain image to resist known-plaintext and chosen plaintext attacks.The key space is large and hence the algorithm can effectively resist brute-force attacks.The proposed scheme is examined using different performance evaluation metrics and the results prove that the proposed scheme is highly secure,and it can effectively resist different attacks.

Sandwich Courses in Higher Education： From Transmitting Knowledge to Building Regional Brand Lessons Learned From the Corsica-region University-sponsored Placements ＆ Careers Service （CFA UNIV） Experience

Long confined to early pre-tertiary school-leaver training and often synonymous with academic failure, sandwich training has experienced a remarkable turnaround, debunking common misconceptions and gaining ground in higher education. Sandwich training improves academic success rates and school-to-work transition prospects, making it both a pathway to excellence and a gateway into employment by keeping a clear tack in the face of social-economic headwinds---especially for young graduates. The factors involved are primarily education-driven （academic success, best-in-class graduates, and etc.）, but where sandwich training really floats is in the job market, by co-potentializing both school-to-work transition and employability. The Corsica-region University-sponsored Placements ＆ Apprenticeships Service （CFA UNIV）, as regional leader in post-secondary sandwich placement （65% of sandwich-placement students in Corsica）, is therefore structurally engaged as a facilitator of the island-wide economy, providing business and industry with a pipeline of core skill sets while readying them to rise to tomorrow＇s economic and human resources （HR） challenges. This paper attempts to highlight this very real trajectory by reporting the lessons learned from Corsica-region CFA UNIV experience.

Existence of Explosive Solutions for a Class of Nonlinear Elliptic Equations

By the subsuper solutions method, the explosive supersolutions and explosive subsol utions are obtained and the exsistence of explosive solutions is proved on a bounded domain for a class of nonlinear elliptic problems.Then, the exsitence of an entire large solution is proved by the perturbed method.

Research and Analyze the Factors Affecting to the Formation of the Economy Area of Fresh Vegetables Cultivation at Ho Chi Minh City Suburb

Vietnam＇s economy is developing more and more rapidly, people＇s income are increasing, and the living condition is better. Today, consumer are increasingly aware of the quality of products, especially fresh food, but they have a little opportunity to choose the products which satisfy the needs, because they are limited to the product information and product origin. Fresh vegetables are one of the essential foods in the family living. The selection of fresh vegetables is not only to serve the basic needs as eating and drinking, but also to include the need for safety. Currently, consumer demand for fresh vegetable are great, especially when the living standards are becoming higher and people pay more attention to their health, especially for the consumer of Ho Chi Minh City. How fresh is vegetable market in Ho Chi Minh City today like.＇？ What is consumers＇ awareness of fresh vegetable？ What factors impact the fresh vegetable buying behavior of consumers？ Why does the development of fresh vegetable market in Ho Chi Minh City currently face many difficulties？ This study surveys the research, analyzes the factors affecting the economic area formation of fresh vegetable plantation at suburb of rio Chi Minh City.

Runoff Management, Wetland Hydrology, and Biodiversity Relations in Minnesota＇s Red River Basin Wetlands

The authors assessed if wetlands can contribute to flood damage reduction in the Red River Basin, Minnesota, by providing reliable flood water storage. Hydrology and biodiversity in 28 natural and restored wetlands suggested uncontrolled natural wetlands provided the highest mean annual flood storage at 15 cm of runoff while single and 2-stage outlet controlled wetlands provided 3.0 and 8.1 cm of runoff control. Natural controlled wetlands, followed by 2-stage and single stage outlet controlled restorations provided 10.2, 6.6, and 2.2 cm of storage for early summer storm events. Two years of recorded water levels and a 20-year continuous meteorological record were used to model ＂temporary water level increases＂ in each wetland. Species diversity, hydrology, and watershed land use variables are inversely related where high quality and diverse wetlands had the lowest amplitude and frequency of water level increases, while low quality wetlands had the highest. Uncontrolled natural wetlands had the highest biological diversity and the lowest frequency and magnitude of temporary water levels increased. A significant biodiversity declines were measured where water level increases were greater than 2.7 meters. Strong multi-linear relationships between watershed land uses and watershed/wetland ratio explained wetland hydraulic performance and biodiversity relations （r2 ranging from 0.6-0.8）. Non-native wetland plant diversity increased with greater water level dynamics.

The Quaternary Tectonic Stress Field of the Kunming Basin and Its Surrounding Areas

The Kunming basin is a Cenozoic faulted basin controlled by N-S trending active faults. there are totally 8 main active faults in and around the Kunming basin area. Inversion of fault slip data suggests that the stress field of the Kunming basin has experienced two major stages. In the first stage ( from the late-Pliocene to mid-Pleistocene),the regional tectonic stress field was characterized by near E-W compression and near N-S extension. In the second stage (from the late-Pleistocene to the present),the tectonic stress field has been mainly characterized by NNW-SSE compression and NEE-SWW extension. Under such a stress field,the near N-S trending faults in the region mainly show a lateral slip.

Migration of multiples from the South China Sea

The South China Sea where water depth is up to 5000 m is the most promising oil and gas exploration area in China in the future.The seismic data acquired in the South China Sea contain various types of multiples that need to be removed before imaging can be developed.However,compared with the conventional reflection migration,multiples carry more information of the underground structure that helps provide better subsurface imaging.This paper presents a method to modify the conventional reverse time migration so that multiple reflections can migrate to their correct locations in the subsurface.This approach replaces the numerical impulsive source with the recorded data including primaries and multiples on the surface,and replaces the recorded primary reflection data with multiples.In the reverse time migration process,multiples recorded on the surface are extrapolated backward in time to each depth level,while primaries and multiples recorded on the surface are extrapolated forward in time to the same depth levels.By matching the difference between the primary and multiple images using an objective function,this algorithm improves the primary resultant image.Synthetic tests on Sigsbee2 B show that the proposed method can obtain a greater range and better underground illumination.Images of deep water in the South China Sea are obtained using multiples and their matching with primaries.They demonstrate that multiples can make up for the reflection illumination and the migration of multiples is an important research direction in the future.

EXISTENCE OF LIMIT CYCLES IN A MULTIPLY-CONNECTED REGION

In this paper,a conjecture about the existence of limit cycles in a multiply-connected regionproposed by Ye Yanqian is proved.

Regional Society and Xiangzu (Rural Lineage) Theories:Socioeconomic History from a Comparative Perspective

Today’s Chinese and Japanese scholars have maintained close dialogues and exchanges in their research on ancient Chinese history.The socioeconomic history of the Jiangnan region during the Ming and Qing dynasties involves two important research areas:regional history and socioeconomic history.Whereas the former embraces a holistic macro-view,the latter lays stress on the economic and social behavior of humankind.Over past years,endeavors to combine the two areas have produced a number of influential general conclusions on the social development of Jiangnan during the Ming and Qing.Professor Mori Masao,a Japanese scholar,has provided an in-depth interpretation of the theory of regional society,while Professor Zheng Zhenman,a Chinese scholar,has responded in terms of xiangzu theory.Long-term dialogues and exchanges in the international academic world that inspire theoretical innovation in studies of earlier societies can serve as a valuable source for the intellectual community.

Prime number theorems for Rankin-Selberg L-functions over number fields

In this paper we define a Rankin-Selberg L-function attached to automorphic cuspidal represen-tations of GLm(AE) × GLm (AF ) over cyclic algebraic number fields E and F which are invariant under the Galois action,by exploiting a result proved by Arthur and Clozel,and prove a prime number theorem for this L-function.

Sponge-templating synthesis of sandwich-like reduced graphene oxide nanoplates with confined gold nanoparticles and their enhanced stability for solar evaporation

Solar evaporation based on plasmonic metal nanoparticles(MNPs)is emerging as a promising technology.However,the fine structure of MNPs is unstable,and both the high temperature generated by intensive light and corrosive ions in water could damage them.The performance will decline after recycling and long-time usage.To address these issues,we adopted a sponge-templating method for preparing sandwich-like nanoplates with the gold nanoparticles(Au NPs)confined in reduced graphene oxide(rGO)nanosheets.Due to the confinement effect,both the surface melting and ion diffusion were suppressed.The solar evaporator based on the sandwich-like nanoplates showed a high solar-vapor conversion efficiency of 85.2%under a high light intensity of 10 kW.After 30 times recycle of seawater desalination,the conversion efficiency scarcely decreased.These sandwich-like nanoplates with enhanced thermal and chemical stability of Au NPs are promising in the practical application of seawater desalination.