Comparison of sulfuric and oxalic acid anodizing for preparation of thermal control coatings for spacecraft

The development of thermal control surfaces, which maintain stable solar absorptivity and infrared emissivity over long periods, is challenging due to severe conditions in low-Earth orbit (LEO). Some candidate coatings are second-surface silver-coated Teflon; second-surface, silvered optical solar reflectors made of glass or quartz; and anodized aluminum. Sulfuric acid anodized and oxalic acid anodized aluminum was evaluated under simulated LEO conditions. Oxalic acid anodizing shows promise of greater stability in LEO over long missions, such as the 30 years planned for the Space Station. However, sulfuric acid anodizing shows lower solar absorptivity

A Wised Routing Protocols for Leo Satellite Networks

This Study proposes a routing strategy of combining a packet scheduling with congestion control policy that applied for LEO satellite network with high speed and multiple traffic. It not only ensures the QoS of different traffic, but also can avoid low priority traffic to be "starve" due to their weak resource competitiveness, thus it guarantees the throughput and performance of the network. In the end, we set up a LEO satellite network simulation platform in OPNET to verify the effectiveness of the proposed algorithm.Comment: The 10th Asian Control Conference (ASCC), Universiti Teknologi Malaysia, Malaysi

Manned Mars mission

Terrapin Technologies proposes a Manned Mars Mission design study. The purpose of the Manned Mars Mission is to transport ten people and a habitat with all required support systems and supplies from low Earth orbit (LEO) to the surface of Mars and, after an expedition of three months to return the personnel safely to LEO. The proposed hardware design is based on systems and components of demonstrated high capability and reliability. The mission design builds on past mission experience but incorporates innovative design approaches to achieve mission priorities. These priorities, in decreasing order of importance, are safety, reliability, minimum personnel transfer time, minimum weight, and minimum cost. The design demonstrates the feasibility and flexibility of a waverider transfer module. Information is given on how the plan meets the mission requirements

The Sustainable Architectural Values of Eclectic Style Shophouses Case Study: Sun Yat Sen Museum Penang, Malaysia

The Sun Yat Sen shophouse in Penang is a small private Museum, which was converted from a shophouse or townhouse situated in theArmenian Street heritage area of George Town. The building is an example of embraces of the architectural heritage of George Town which is an extraordinarily beautiful example of Straits Settlements merchant's shophouse.Historically, it is associated with the global historical personality of Dr. Sun Yat Sen and hisrevolutionary. This city was added to the UNESCO's world heritage list in 2008 to acknowledge its rich cultural heritage that constitutes of unique architectural and cultural townscape along the Straits of Melaka. This paper investigates the architectural plan of a shophouse and the valuesof cultural heritage buildingswhich eventually was converted into a Museum in George Town, Penang. Classified as an eclectic style shophouse, it is rich in design and art components featured in its architecture that are still sustaining until today. This building has an interesting mixture of architectural and cultural inspirations adapted from the Chinese origin, with the local Malay ethnicity and the European influencesthat colonised the region. The introduction of new non related architectural components into the southern Chinese (eclectic style) style in shophouses in George Town has resulted in the disappearance of this unique style of architecture. This investigation employs a qualitative research approach by documenting evidence and understanding the architectural as well as cultural influences of the southern Chineseeclectic style by studying the Sun Yat Sen Museum as a case study. The findings of the research point towards an understanding of the architectural and cultural influences that govern the design of the shophouse and its architectural character

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Smart Communication Satellite (SCS) Project Overview

Smart Communication Satellite (SCS) is the first low earth orbit (LEO) mobile communication test satellite of China, whose core mission is to conduct technical exploration and verification for building satellite internet. Launched in September, 2014, SCS completed its whole on-orbit experiments in October, 2014. In order to resolve the contradiction between the coverage area and communication rate of LEO communication satellites, SCS adopts on- board smart antenna, whereby dynamically changing spot beams can be formed. Moreover, SCS has developed payload-centered satellite design technique as well as internet-oriented software satellite technique, and finally accomplished the design for application-oriented micro-satellite which is 100Kg-class weighted and applicable to communication and navigation services. The innovative techniques of SCS verify the new direction of development in the future satellite internet

The Classic, Spring 2014

Zwemer View: Courageous and Faithful; In Box; Around the Green: The World\u27s a Classroom; Bidders\u27 Buy; Ramaker Repurposed; Campus Life: Warm Cookie Wednesdays; Accolades; Spring Work; Research Grants; Career Boot Camp; Day for Justice; Grade A; Bravo!; Action-packed Worship; Face Value: Kim Jongerius; Called to Serve; Leader Among Leaders; In Print; Smooth Sailing; Red Zone; The Sun Sets on West; 1000 Words: Memory Keeper; Called to the City; Job One; Strongman: Powerlifter Jona Leo raises the bar, setting bench press world record; Red Ties; Pink Power; Pointing to Jesus; The Business of Friendship; He\u27s Got Game; Class Notes; New Arrivals; Marriages; In Memoriam; Classic Thoughts: Hospers Is Home; Leave A Legacy; Athlete Advocatehttps://nwcommons.nwciowa.edu/classic2010/1008/thumbnail.jp

Passive Thermal Coating Observatory Operating in Low-Earth Orbit (PATCOOL) Cubesat Design to Test Passive Thermal Coatings in Space

The PATCOOL is a NASA sponsored, University of Florida developed 3U Cu-beSat meant to investigate the feasibility of using a cryogenic selective surface coating as a new, more efficient way of passively cooling components in space. Initial tests on the ground demonstrate that this coating should provide a much higher reflectance of the Suns irradiant power than any existing coating, while still providing far-infrared power emission. The ultimate validation of this tech-nology requires on-orbit testing. PATCOOL hosts a 4-sample housing, with the samples shaped as thin cylinders (coin-like). Two samples are coated with state-of-the-art material, while the other pair uses the new coating to be evaluated. The temperatures of all samples during the mission (minimum 72 hours of data col-lection) are measured via thermistors. The samples are connected via thin Kevlar strings to the housing, to minimize heat transfer. The housing is designed to shield the samples from Earths thermal radiation, and the CubeSat is attitude stabilized and controlled via a gravity gradient boom, magnetorquers and a reaction wheel set. Thermal Desktop simulations show PATCOOLs ability to thermally isolate the samples from heat exchanges other than with Sun and deep space, thanks to its thermal design and the chosen attitude profile