首页 | 本学科首页   官方微博 | 高级检索  
文章检索
  按 检索   检索词:      
出版年份:   被引次数:   他引次数: 提示:输入*表示无穷大
  收费全文   10篇
  免费   0篇
航空   1篇
航天   9篇
  2018年   1篇
  2006年   1篇
  2000年   2篇
  1997年   1篇
  1994年   1篇
  1992年   1篇
  1991年   1篇
  1989年   1篇
  1987年   1篇
排序方式: 共有10条查询结果,搜索用时 359 毫秒
1
1.
Efforts within the US Air Force to integrate its two primary components, air and space, have yielded — at best — slow and dubious results. Many space advocates and analysts assumed that the vital role space played in the Gulf War would result in space being recognized as warranting an equal position with the air component of the Air Force, if not the creation of a separate service. Although rhetoric has seemed to support those assumptions, actual progress has remained slow. In this article, the role played by organizational culture as an inhibiting factor in integration is examined. Education, as both an element of culture and an indicator of organizational commitment, is also considered. The trials of ‘teaching’ and integrating space into an already existing structure at the senior Air Force Professional Military Education (PME) institution, the Air War College, is examined as illustrative. The conclusion reached is that the current environment is not conducive to integration and that, without a push from the outside, rhetoric will likely continue to outpace substantive progress, with potentially negative result.  相似文献   
2.
In 1981 the US spacecraft planned for the international Solar Polar Mission, in cooperation with the European Space Agency, was abruptly withdrawn. This article discusses the events leading up to the withdrawal and how it was handled by NASA and US government officials, and ESA's reaction. Reflections are offered on the experience, and ESA's current attitude towards space partnerships with the USA is examined. The author concludes the Europe is in a stronger bargaining position today, and has also advanced towards having its own autonomous space capability.  相似文献   
3.
Alice in Licenseland: US satellite export controls since 1990   总被引:1,自引:0,他引:1  
The events leading up to the convening of the Cox Committee by the US Congress in 1998, and those following the declassification of its report in 1999, have had a significant worldwide impact on the US export licensing process. US laws that were once business-friendly have become more stringent to accommodate national security concerns, but with no differentiation between potential adversaries and allies. Whether the change will actually be able to achieve the intended national security goals is uncertain, especially since many of the new measures taken differ from the actual recommendations of the Cox report. In the meantime, international aerospace commerce has become encumbered by rules at best ambiguous, at worst counterproductive.  相似文献   
4.
Until now space activity has been driven by international political competition. But recent events in Eastern Europe have undercut the political incentives for expanded space activity, and meanwhile fiscal constraints, arising for different reasons in the USA, Europe and the USSR, are putting unprecedented pressure on space budgets. In the long term, however, it is likely that a new kind of competition fuelled by economic motives will provide the basis for a more determined and perhaps more stable opening of the space frontier. Dropping out of the space race for short-term reasons could be a costly and irrevocable decision.  相似文献   
5.
Since the 1950s, crewed spaceflight has been the province of NASA, a decision reaffirmed in the 1960s with the cancellation of all military projects which might have competed. That understanding has driven American space policy since that time despite the fact that the military has not given up its dream of crewed spaceflight. Over the past decade, that division of labor has begun to break down in part due to the military's heightened awareness of the usefulness of space as operational location. The Air Force, the service most committed to this vision of military space, has in its planning for the next generation returned to the concept of military space activities across the spectrum. In essence, the implied social contract which drove American crewed spaceflight since the sixties is now undergoing revision and possible reversal. Given the political climate, NASA may be particularly vulnerable to such challenges. The impact of such a change upon the world wide human spaceflight effort is unknown but likely to be extremely disruptive as military considerations move to the fore. The debate is ongoing, the major limitation remains budget so that any agreed upon changes are likely to be slow to occur.  相似文献   
6.
InSight Mars Lander Robotics Instrument Deployment System   总被引:1,自引:0,他引:1  
The InSight Mars Lander is equipped with an Instrument Deployment System (IDS) and science payload with accompanying auxiliary peripherals mounted on the Lander. The InSight science payload includes a seismometer (SEIS) and Wind and Thermal Shield (WTS), heat flow probe (Heat Flow and Physical Properties Package, HP3) and a precision tracking system (RISE) to measure the size and state of the core, mantle and crust of Mars. The InSight flight system is a close copy of the Mars Phoenix Lander and comprises a Lander, cruise stage, heatshield and backshell. The IDS comprises an Instrument Deployment Arm (IDA), scoop, five finger “claw” grapple, motor controller, arm-mounted Instrument Deployment Camera (IDC), lander-mounted Instrument Context Camera (ICC), and control software. IDS is responsible for the first precision robotic instrument placement and release of SEIS and HP3 on a planetary surface that will enable scientists to perform the first comprehensive surface-based geophysical investigation of Mars’ interior structure. This paper describes the design and operations of the Instrument Deployment Systems (IDS), a critical subsystem of the InSight Mars Lander necessary to achieve the primary scientific goals of the mission including robotic arm geology and physical properties (soil mechanics) investigations at the Landing site. In addition, we present test results of flight IDS Verification and Validation activities including thermal characterization and InSight 2017 Assembly, Test, and Launch Operations (ATLO), Deployment Scenario Test at Lockheed Martin, Denver, where all the flight payloads were successfully deployed with a balloon gravity offload fixture to compensate for Mars to Earth gravity.  相似文献   
7.
The Inter-Agency Consultative Group (IACG) is an organization which seeks to maximize scientific returns from focused areas of space science through international cooperation. In its 11-year history the IACG has experienced both monumental success (with the collaborative exploration of Comet Halley) and, more recently, some serious growing pains in its second phase of operation, which focuses on solar terrestrial science. In this post-Cold War period, with increased interaction between countries offering greater opportunities for cooperation, the lessons to be learned from the IACG's experience will be valuable ones.  相似文献   
8.
It is becoming increasingly clear that space activities can benefit from international cooperation, but concerns about national interests remain. This article examines the experience of the Inter-Agency Consultative Group (IACG), which achieved striking success in coordinating the efforts of the USA, the USSR, the European Space Agency and Japan to study Halley's Comet. Subsequently the IACG has undertaken a new project, focused on solar-terrestrial science, and further expansion could follow. However, tje group's success has depended on scrupulous respect for members' national autonomy, and so it is unlikely to herald the formation of a supranational space agency in the near future.  相似文献   
9.
Through a techno-nationalist lens, this paper will assess the growing China–European Union (EU) space partnership, and its implications for international space cooperation and competition. Techno-nationalism (jishu minzuzhuyi), the idea that technological strength is an effective determinant of national power in a harshly competitive world,3 informs both Chinese and US perceptions of China's space development. Using this lens elevates all space activities—manned, unmanned, military and scientific—to the strategic level. It is our contention that because of the increasing China–EU space partnership, the USA must re-evaluate its approach to China—away from the containment approach, which has thus far predominated, toward an approach which would offer the USA the opportunity to influence and, thereby, decrease the importance of the emerging partnership.  相似文献   
10.
The development of a global environmental and disaster satellite observation system (EDOS) has recently received attention, particularly as a potential cooperative project with the USA and Japan as the initiators. Such a system, proponents contend, would provide valuable and potentially lifesaving information to developed and particularly developing countries which might not otherwise have such information available, as well as provide a vehicle to strengthen ties between the USA and Japan at a time when strife over trade issues is too often emphasized. The initiation of such a project, however, has not been without difficulty. Beyond the technical issues, there has been hesitation and scepticism on the part of some national space players concerning the project, often motivated by parochial political concerns rather than conceptual or technical issues. The focus of this article is an examination of those political factors which have acted as impetus and barriers for the initiative, using interviews with programme participants, direct author observation at related meetings and internal documents and correspondence.  相似文献   
1
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号