RTEMS移植到SAILING S698处理器的BSP开发

RTEMS是一款优秀的实时嵌入式操作系统,它支持多种处理器架构,具有良好的可移植性和裁剪性,支持多种API标准以及开源的特点使得它被广泛地应用在多种嵌入式领域。以基于SPARC V8架构的SAILING S698处理器开发板为目标,分析了RTEMS移植到S698的主要过程,介绍了RTEMS移植的开发环境配置,描述了在配置好的环境下板支持包(BSP)的开发详细步骤。

RTEMS移植到SAILING S698处理器的开发环境配置

RTEMS是一款优秀的实时嵌入式操作系统,它支持多种处理器架构,具有良好的可移植性和裁剪性,支持多种API标准以及开源的特点,使得它被广泛应用在多种嵌入式领域.以基于SPARCV8架构的S698处理器开发板为目标,分析了RTEMS移植到S698的主要过程,描述了开发环境的配置方法,并以RTEMS标准例程验证开发环境的正确性.

The Structure and Evolution of Sea Breezes During the Qingdao Olympics Sailing Test Event in 2006

Using data from automatic surface weather stations, buoys, lidar and Doppler, the diurnal variation and the three-dimensional structure of the sea breezes near the sailing sites of the Good Luck Beijing- 2006 Qingdao International Regatta from 18 to 31 August 2006 are analyzed. Results show that excluding rainy days and days affected by typhoon, the sea breezes occur nearly every day during this period. When Qingdao is located at the edge of the subtropical high at 500 hPa, the sea breeze is usually stronger, around 3-4 m s^-1. It starts at around 1100 to 1300 LST and lasts about 6 hours. The direction of the sea breeze tends to be southeasterly. When Qingdao is under the control of the subtropical high, the sea breeze is usually weaker, less than 2.5 m s^-1 throughout the day, and begins later, between 1300 and 1500 LST. In this case, the direction of the sea breeze is variable from easterly to southeasterly. Most sea breezes in Qingdao are very shallow, up to 300 meters deep. Strong sea breezes can reach 1.5 km in depth and can push as far as 100 km inland. If the Huanghai sea breeze moves inland and meets the sea breeze of the Jiaozhou Bay in the western part of Qingdao, the sea breeze will strengthen and form three boundaries due to the interaction of the two sea breezes.

PROSPECT OF GLOBALIZATION: NO MORE SMOOTH SAILING BUT DYNAMICS REMAIN

The election of Donald Trump as US President worries some of the people about reversal of globalization.As Trump talked a lot against globalization,they believe that his election is the beginning of the end of globalization.Furthermore,a series of events such as the Brexit and

Symbolism and Spiritual Freedom in Yeats' Sailing to Byzantium

This paper attempts to analyze the symbolism that is embodied in"Sailing to Byzantium"and to further understand the spiritual freedom W. B. Yeats expressed in the poem. Studying the contrasts of the symbols and the eternity and holy spirit carried by Byzantium, we can understand Yeats' life philosophy, and finally reach his spiritual freedom which perpetuates itself in art.

Tank Tests with a Scaled Model of a BOC-50 Sailing Yacht Model in Calm Water and in Regular and Random Head Waves

In this paper the performance of a BOC-50＇ sailing yacht model in calm water and in realistic sea states is investigated experimentally. A scaled model of the hull form with the keel-bulb configuration has been tested in the towing tank of the LSMH of NTUA. During the tests the calm water resistance and the dynamic responses, including the added resistance in waves were recorded. Results referring to the resistance, the side force, the CG displacement, the pitch as well as the vertical accelerations of the model at the bow, the CG and the stern are presented. Moreover, by using a Velocity Prediction Program the polar and the stability diagram of the tested sailing yacht were calculated. Useful conclusions about the dynamic behavior of the model were obtained.

Seeking the Spiritual Home — Sailing to Byzantium

As the greatest lyric poet of the 20th century,Yeats fully expresses his pursuit of eternal spiritual home in his poem“Sailing to Byzantium”.This paper analyzes the text and discusses how the poet strives to pursue his spiritual home,so as to deepen our readers’understanding of“eternity”theme in the poem.Seeking the Spiritual Home—Sailing to Byzantium.

Mr.Du,the Steersman's Brainstorming to Helm the Industry's Sailing

Mr. Du Yuzhou, President of China National Textile and Apparel Council, is still steering the country’s flagship of textile industry. The wheelman has proactively been engaged in promoting the m ark etizatio n process with his open- minded, insightful thoughts and free trade philosophy.

Design,modeling and experimental investigation of a novel solar sail with high area-to-mass ratios for efficient solar sailing

Solar sailing is a promising propellant-free approach to propelling spacecraft in space.However,the propelling efficiency of conventional solar sail spacecraft is limited by their areato-mass ratios.This paper proposes a novel design of micro solar sails with area-to-mass ratios above 100 m2/kg for next-generation chip-scale spacecraft.Bilayer thin films developed by Microelectromechanical Systems(MEMS)technologies were patterned into grid microstructures,and theoretical analysis of a sail prototype was conducted.The electro-thermal and thermo-mechanical models of the solar sail in geospace were established by taking effects of Joule heating,solar radiation,and thermal re-emission into consideration,enabling rapid prediction of its threedimensional(3-D)reconfiguration from the as-released two-dimensional(2-D)microstructure.Adjustment of the ChipSail’s acceleration arising from the sail’s morphing was also analytically modeled.Fabrication and characterization of the sail prototype made of multiple Al/Ni50Ti50 bilayer beams were accomplished.In-situ SEM imaging of the sail prototype in vacuum chamber witnessed an active and continuous 3-D reconfiguration under Joule heating,and over 90deformation was detected by applying a DC voltage of 0.078 V.Theoretical and experimental work on the solar sail with at least 10 times higher area-to-mass ratios than conventional ones will lay a solid foundation for efficient solar sailing.

Design and application of solar sailing: A review on key technologies

Solar sail technology has been proposed and developed for space explorations with advantages of low launch cost,no-propellant consumption,and continuous thrust,which has great potentials in earth polar detection,interstellar explorations and etc.The development of solar sail has made significant progress in structural design,manufacturing,materials,orbit transfer,and stability control in the past few decades,which makes meaningful contributions to astronomy,physics,and aerospace science.Technological breakthroughs of Solar Radiation Pressure(SRP)propulsion and interstellar transfer have been achieved in current solar sail missions.However,there are still many challenges and problems need to be solved.This paper attempts to summarize the research schemes and potential applications of solar sailing in space missions from the viewpoint of key technologies,so as to provide an overall perspective for researchers in this field.Analyses of the key technologies of solar sailing system design are provided.Finally,challenges and prospective development of solar sailing are discussed.

Solar sailing trajectory optimization with planetary gravity assist

Significant propellant mass saving can be obtained with the use of complex multiple intermediate flyby maneuvers for conventional propulsion systems,and trip time also decreases for a portion of the proper solar sail missions.This paper discusses the performance of gravity assist(GA)in the time-optimal control problem of solar sailing with respect to sail lightness number and the energy difference between the initial and final orbit in the rendezvous problem in a two-body model,in which the GA is modeled as a substantial change in the velocity of the sailcraft at the GA time.In addition,this paper presents a method to solve the time-optimal problem of solar sailing with GA in a full ephemeris model,which introduces the third body’s gravity in a dynamic equation.This study builds a set of inner constraints that can describe the GA process accurately.Finally,this study presents an example for evaluating the accuracy and rationality of the two-body model’s simplification of GA by comparison with the full ephemeris model.

Traffic Distribution of Circular Sailing Routing in Dense Multihop Wireless Networks

Shortest path routing protocol intends to minimize the total delay between every pair of destination node and source node. However, it is also well-known that shortest path routing suffers from uneven distribution of traffic load, especially in dense wireless networks. Recently, several new routing protocols are proposed in order to balance traffic load among nodes in a network. One of them is Circular Sailing Routing （CSR） which maps nodes on the surface of a sphere and select routes based on surface distances. CSR has been demonstrated with better load balance than shortest path routing via simulations. However, it is still open that what load distribution CSR can achieve. Therefore, in this paper, we theoretically analyze the traffic load distribution of CSR in a dense circular wireless network. Using the techniques developed by Hytti and Virtamo, we are able to derive the traffic load of any point inside the network. We then conduct extensive simulations to verify our theoretical results with grid and random networks.

At the 60^(th) anniversary,sailing a university dream

【正】At the 60thanniversary of the China University of Petroleum,I just,on behalf of the China University of Petroleum(Beijing),extend my genuine congratulations and sincere gratitude to all our overseas and domestic alumni,students,faculty and staff.For sixty years,from the start to nowadays,from a weak university to a strong one,it has cultivated over 20,0000 outstanding talents for petroleum industries in China.Students of the China University of Petroleum are sprinkling across the country,like brilliant bright pearls,throughout each corner of the world.At the 60thanniversary of the China University of Petroleum,the alma mater kindly informs each of you that the

Sailing In Sea of Commerce

The law of big fish swallowing little fish has expired when it comes to the era of new economy.What prevails nowadays in the sea of commerce is quick fish swallowing slow fish.In the Internet economy,small companies are not destined to lose to giants,but slow ones are doomed to become prey of their quick counterparts. The swiftly rising Yongkang Group has made a breakthrough in dental treatment by translating the law into practice.It is called"Law of the Sea."‘Law of the Sea’

Sailing Into the Storm

International praise for Chinese escort fleets protecting merchant ships against Somali

Swank Sailing

A considerable number of Chinese consumers are taking up the hobby of yachting, reflecting the nation's growing wealth A yacht is an extremely luxurious toy, costing perhaps millions of dollars. Despite this, yachting has caught on in China in the last 10 years. At the Taihu Lake in Wuxi City, Jiangsu Province, an American-invested yacht

Fuel consumption for interplanetary missions of solar sailing

The orbits of solar sails can be changed by adjusting the sail’s attitude through external control torques.The resulting momentum will be changed,either provided by a typical attitude control subsystem or by a propellantless device.This paper investigates the extra momentum input and fuel consumption for a typical attitude control subsystem.The minimum-time transfer trajectories are designed for two rendezvous missions using both indirect and direct methods,generating continuous and discrete attitude histories,respectively.The results show that the momentum variation is almost wholly due to the solar radiation pressure.The feasibility of using tip-mounted microthrusters for attitude control is evaluated.The results show that less than0.1 kg of propellant are required for an interplanetary transfer mission when pulsed plasma thrusters with a specific impulse of700 s and a thrust of 150 mN are mounted at the tip of a 20 m square solar sail.The fuel consumptions of two transfer missions indicate that a tip-mounted pulsed plasma thruster is a viable technique for the attitude control of a solar sail.

Message from the Guest Editors of the Special Issue on Solar-Photon Space Sailing

Since the 1960s,an increasing interest in space propulsion methods(a)not-high-limited in energy(e.g.,electric rocket propulsion)and(b)involving no propellant(space sailing),has been advancing from theoretical,numericalsimulation,and technological viewpoints.In particular,among the propulsion concepts of type(b),solar-photon sailing(SPS)has received greater and greater attention.

Dynamic Analysis and Parametric Optimization of Telescopic Tubular Mast Applied on Solar Sail

Large-scale solar sails can provide power to spacecraft for deep space exploration.A new type of telescopic tubular mast(TTM)driven by a bistable carbon fiber-reinforced polymer tube was designed in this study to solve the problem of contact between the sail membrane and the spacecraft under light pressure.Compared with the traditional TTM,it has a small size,light weight,high extension ratio,and simple structure.The anti-blossoming and self-unlocking structure of the proposed TTM was described.We aimed to simplify the TTM with a complex structure into a beam model with equal linear mass density,and the simulation results showed good consistency.The dynamic equation was derived based on the equivalent model,and the effects of different factors on the vibration characteristics of the TTM were analyzed.The performance parameters were optimized based on a multiobjective genetic algorithm,and prototype production and load experiments were conducted.The results show that the advantages of the new TTM can complete the deployment of large-scale solar sails,which is valuable for future deep space exploration.

“SAIL·立学”课堂校本化实践路径探索

“SAIL·立学”是江苏南通“立学课堂”的校本化实践。一方面其丰富了“立学课堂”的实践经验,为课堂教学提供了鲜活的一手资料,另一方面“立学课堂”的高站位又为“SAIL·立学”课堂的实践指明了正确方向“。情境体验“”夯基固本“”学科融合“”知行合一”是其教学策略“。课标引航,以学定教“”问题导航,限时讲授“”活动探航,小组合作“”评价续航,踊跃展示”是其教学流程。让学习在课堂上真实发生、让核心素养培育真正落地;向海图强、以海育人、培塑有大海气质的时代新人;促进教师专业发展、促进学校品质提升,这是“SAIL·立学”课堂的价值旨归。