5,382 research outputs found
Apollo experience report: Guidance and control systems. Lunar module stabilization and control system
A brief functional description of the Apollo lunar module stabilization and control subsystem is presented. Subsystem requirements definition, design, development, test results, and flight experiences are discussed. Detailed discussions are presented of problems encountered and the resulting corrective actions taken during the course of assembly-level testing, integrated vehicle checkout and test, and mission operations. Although the main experiences described are problem oriented, the subsystem has performed satisfactorily in flight
Recommended from our members
Online Master Program in System Technology
The University of Louisiana at Lafayette proposed the creation of a Master of Science in Systems Technology (STEC) in 2013 to the State of Louisiana Board of Regents which was approved in 2014. The delivery of the new MS degree was 100% online to facilitate access to a wide student base within the state of Louisiana and beyond. The objective of Systems Technology education intends to equip students with the knowledge base, skill set and cutting-edge tools to develop solutions to complex systems problems in a diversity of industries. It is designed for industrial and engineering technologists, and other professionals engaged in developing systems to meet required specifications.Cockrell School of Engineerin
Indigenous territories and tropical forest management in Latin America
Using data from Latin America, the authors argue that fundamental changes must take place in the legal recognition and demarcation of indigenous territories if indigenous peoples are to fulfill their potential as resource managers for threatened tropical forest ecosystems. The authors compare different national land tenure models for forest-dwelling indigenous peoples (contained in national Indian, agrarian, and protected-area laws in Latin America) and a model proposed by indigenous organizations in Latin America. The conventional models emerged during an era when most governments were more concerned with the rapid occupation and exploitation of frontier zones and the assimilation of indigenous peoples. Recent attention to the environmental degradation of these areas and the need to create alternative models of land use and development have directed attention to the potential contribution of indigenous peoples to the conservation and management of the vast tropical forests of Latin America. The authors find that indigenous peoples must be given some degree of control over their territories and resources. They contend that for successful management of tropical forests there must be a new type of partnership between indigenous peoples, the scientific community, national governments, and international development agencies. This relationship should be a contractual one, in which indigenous peoples are provided with juridical recognition and control over large areas of forest in exchange for a commitment to conserve the ecosystem and preserve biodiversity.Municipal Financial Management,Agricultural Knowledge&Information Systems,Forestry,Environmental Economics&Policies,Banks&Banking Reform
Program of analytical and experimental study of porous metal ionizers summary report
Cesium ion emission of porous tungsten material
British attitudes to the Schlesftig-Holstein question, 1848-50
British attitudes during the Schleswig-Holstein War of 1848-50 were
predominantly pro-Danish. The invasion of Denmark and the Elbe Duchies by
the Confederation of German States, led by Prussia, was looked upon as an
attempt by a large and aggressive power to bully a smaller and inoffensive
neighbour into surrendering a large part of her territory and excellent
ports on the Baltic and Korth Seas. Besides the belief that Denmark had a
legal right to the Duchies it was feared that should Germany gain control of
this strategic area, she would in time build a merchant fleet and a navy
which could offer Britain serious competition. In addition, should the
Germans have their own way, the Duchies would probably become members of
the Zollverein which already imposed high tariffs on British Goods. Should
the Duchies join this union, probably other north German areas would too, and
perhaps even a good part of Scandinavia would be economically compelled to
enter it. This danger helped to convince many Britons that the Helstat
should remain intact
What influences the Changes in REIT CEO Compensation?: Evidence from Panel Data
This study examines what influences the changes in REIT CEO compensation using the following performance measures: average three-year total returns to shareholders, market value added, Tobin's q, and change in funds from operations. In addition, we examine the impact of managerial power on the change in compensation. Unbalanced panel data is employed to capture both the time-series and cross-sectional effects. The empirical evidence indicates that firm performance and size do not influence the change in CEO salary, while risk, tenure, title, ownership, and age have significant impacts. Contrary to previous findings and a priori expectations, bonuses are not influenced by risk, size, or CEO power; however, they are influenced by performance. Option awards are affected by performance and CEO power.
Advances in Forage Legumes: Shrub Legumes
Forage tree legumes benefit agriculture through their multi-purpose contributions to livestock feeding, to productivity of farming systems, and to protection of the environment.
Of the several hundred forage tree legume species regarded as having potential for forage only c. twenty are in common use. These are listed together with their agroecological range and tolerance of adverse environments including acid soils, cool temperatures, low rainfall, poor drainage and high salinity. The value of many species to ruminants is limited due to low nutritive value arising from low protein availability and low acceptability caused principally by high condensed tannin content. Only 10 of the 20 listed species are considered to have a high nutritive value viz. Albizia lebbeck, Chamaecytisus palmensis, Cratylia argentea, Desmodium rensonii, Desmanthus virgatus, Gliricidia sepium, Leucaena leucocephala, Leucaena diversifolia, Sesbania grandiflora,and Sesbania sesban.
The germplasm in commercial use worldwide is often inferior and with a narrow genetic base. The need for farmer access to a greater diversity of planting material and improved varieties through better distribution systems is highlighted. However, plant improvement is often limited due to taxonomic confusion in many genera e.g. Albizia, Prosopis, and farmer access to new varieties is limited by lack of information and lack of resources to purchase high quality seeds. There is debate over whether to use fast growing exotic species or slower growing native species. There are as many as 150-200 M people use Gliricidia sepium worldwide but there is minimal use in its native range. Conversely, native Acacia communities are over-exploited in their native range with minimal use elsewhere. Conservation of native range is critical and in situ, ex situ and circa situm approaches are suggested. Issues of weediness potential are paramount when using exotic species requiring greater care in the evaluation of risk factors.
Finally, the reasons for successes and failures in promotion of forage tree legume use in world farming systems are analyzed and suggestions made to extend the utilization of this important group of legume species
- …