The Next Big Things for Top-market BizAv OEMs

<正>AS OEM's display their flagship ultra-longrange, purpose-built business jetsspecifically Bombardier's Global 7500,Gulfstream's G650ER, and Dassault's Falcon 8X-this week at EBACE 2019, speculation stoked by the manufacturers themselves abounds on what comes next.When Gulfstream's flagship G650 entered service in December 2012, the Savannah airframer decisively seized the mantle of largest dedicated business jet. That was reinforced when the 7,500-nm-range G650ER variant joined its line     

新技术正在推动飞机喷涂技术创新

当前各种技术创新正在带动周边产业升级发展,如复合材料在新型飞机的占比越来越高、自动化在航空制造业的应用范围日益扩大等,正在推动着飞机的喷涂技术升级。但由于飞机尺寸较大等因素,自动化机器人喷漆很难在售后服务市场中得到广泛应用。相比之下,紫外线(UV)喷涂技术有望成为下一代喷涂技术升级的热点。     

Editorial: The End of J.RSMC

Journal of Reducing Space Mission Cost -     

Temperature-Driven Segmentation for Autonomous Anti-Tank Weapons

In this paper we discuss a simple temperature-driven segmentation technique that can be used for autonomous terminal guidance of anti-tank munitions. A ratio between two images from different IR bands is taken to form an emissivity independent image that is a function of temperature only. Size and temperature discrimination can then be used to find hot spots of interest. Candidate targets are segmented from the image about the points of interest using an.algorithm that finds all regions in multi-region objects and does not require a priori intensity information. Size and gross shape features are used to determine if the segmented objects are to be classified as targets. The key to this approach is the initial hot spot extraction. The temperature dependent ratio image allows quick and confident screening of the entire field of view, so that only the regions of interest require further processing. The described techniques effectively found tanks in the presence of common battlefield clutter when used with synthetic IR imagery provided by Georgia Tech Research Institute. The simplicity, effectiveness and potential speed of this technique make it ideal for autonomous guidance of expendable anti-tank weapons, especially where only low resolution IR imagery is available.     

Following the water,the new program for Mars exploration

In the wake of the loss of Mars Climate Orbiter and Mars Polar Lander in late 1999, NASA embarked on a major review of the failures and subsequently restructured all aspects of what was then called the Mars Surveyor Program--now renamed the Mars Exploration Program. This paper presents the process and results of this reexamination and defines a new approach which we have called "Program System Engineering". Emphasis is given to the scientific, technological, and programmatic strategies that were used to shape the new Program. A scientific approach known as "follow the water" is described, as is an exploration strategy we have called "seek--in situ--sample". An overview of the mission queue from continuing Mars Global Surveyor through a possible Mars Sample Return Mission launch in 2011 is provided. In addition, key proposed international collaborations, especially those between NASA, CNES and ASI are outlined, as is an approach for a robust telecommunications infrastructure.     

Increasing student learning through space life sciences education

Scientists and educators at Baylor College of Medicine are using space life sciences research areas as themes for middle school science and health instructional materials. This paper discusses study findings of the most recent unit, Food and Fitness, which teaches concepts related to energy and nutrition through guided inquiry. Results of a field test involving more than 750 students are reported. Use of the teaching materials resulted in significant knowledge gains by students as measured on a pre/post assessment administered by teachers. In addition, an analysis of the time spent by each teacher on each activity suggested that it is preferable to conduct all of the activities in the unit with students rather than allocating the same total amount of time on just a subset of the activities.     

Toward optimizing lighting as a countermeasure to sleep and circadian disruption in space flight

Light is being used as a pre-launch countermeasure to circadian and sleep disruption in astronauts. The effect of light on the circadian system is readily monitored by measurement of plasma melatonin. Our group has established an action spectrum for human melatonin regulation and determined the region of 446-477 nm to be the most potent for suppressing plasma melatonin. The aim of this study was to compare the efficacy of 460 and 555 nm for suppressing melatonin using a within-subjects design. Subjects (N=12) were exposed to equal photon densities (7.18 x 10(12) photons/cm2/s) at 460 and 555 nm. Melatonin suppression was significantly stronger at 460 nm (p<0.02). An extension to the action spectrum showed that 420 nm light at 16 and 32 microW/cm2 significantly suppressed melatonin (p<0.04 and p<0.002). These studies will help optimize lighting countermeasures to circadian and sleep disruption during spaceflight.     

The limits of stratofilm®

An abnormally large number of catastrophic failures have occurred in recent years which have prompted a number of investigations. This paper documents the efforts by Winzen engineers to determine the cause of these dangerous failures. It is concluded that catastrophic failure will occur if internal caps separate from the wall of the balloon at too low an altitude. Cap separation may be prevented by the use of external caps.     

High-frequency radio experiments with the WISP system on Spacelab

WISP/HF is the medium- and high-frequency part of the Waves-In-Space-Plasmas facility. It is a flexible Shuttle/Spacelab instrument for transmitting, receiving and processing signals in the 0.3 to 30 MHz range. WISP/HF will be used to study the transmitting antenna, fundamentals of electromagnetic (EM) and electrostatic (ES) waves in magnetoplasmas, plasma instabilities and nonlinearities, and sounding of ionospheric structure.