Backward-Wave Oscillation Criterion in a Step-Tapered Helix Travelling-Wave Tube
In: Defence science journal: DSJ, Band 59, Heft 1, S. 49-54
ISSN: 0011-748X
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In: Defence science journal: DSJ, Band 59, Heft 1, S. 49-54
ISSN: 0011-748X
In: Africa quarterly: Indian journal of African affairs, Band 24nos.1-2, Heft 1987
ISSN: 0001-9828
In: Africa quarterly: Indian journal of African affairs, Band 23
ISSN: 0001-9828
In: Defence science journal: DSJ, Band 58, Heft 6, S. 768-770
ISSN: 0011-748X
In: Environmental science & policy, Band 8, Heft 1, S. 67-74
ISSN: 1462-9011
In: Defence science journal: DSJ, Band 59, Heft 5, S. 549-552
ISSN: 0011-748X
In: Defence science journal: a journal devotet to science & technology in defence, Band 59, Heft 5, S. 545-549
ISSN: 0011-748X
In: The IUP Journal of Information Technology, Band 6, Heft 1, S. 7-15
SSRN
In: Pacific affairs: an international review of Asia and the Pacific, Band 6, Heft 8, S. 555
ISSN: 1715-3379
In: Defence science journal: DSJ, Band 50, Heft 1, S. 83-86
ISSN: 0011-748X
In: Defence science journal: DSJ, Band 71, Heft 3, S. 337-340
ISSN: 0011-748X
Study of multipaction breakdown margins in the output connector of a travelling-wave tube (TWT) is essential for application in satellite-borne systems. A TWT uses a coaxial ceramic window, a coaxial output coupler and / or a waveguide output coupler that are prone to multipaction breakdown boosted by high RF power due to the ion accumulation in critical regions during the transition of the satellite through plasma pockets in space. A detailed procedure for estimating the multipaction susceptibility margins in a TWT using CST studio and analytical equations is presented in this paper, and output couplers of two typical TWTs are analysed and the results are presented.
In: Environmental science and pollution research: ESPR, Band 23, Heft 14, S. 14269-14283
ISSN: 1614-7499
Metadata only record ; This program, funded by USAID and managed by Virginia Tech in the Office of International Research, Education and Development, applies research and development of sustainable agriculture and natural resource management. The SANREM CRSP sponsors long-term research in five areas in over ten countries in Latin America, Asia and Africa. Partners range from universities, governmental organizations, corporate partners and Non-Governmental Organizations (NGOs). In addition, this project has been supported by the Soil and Water Conservation Society (SWCS). This resource links the work of the SANREM CRSP and SWCS projects, to allow for opportunities for future collaboration. ; ME (Management Entity)
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INTRODUCTION: Individuals with delayed below-knee amputation have previously reported superior clinical outcomes compared with lower limb reconstruction. The UK military have since introduced a passive-dynamic ankle-foot orthosis (PDAFO) into its rehabilitation care pathway to improve limb salvage outcomes. The aims were to determine if wearing a PDAFO improves medium-term clinical outcomes and what influence does multidisciplinary team (MDT) rehabilitation have after PDAFO fitting? Also, what longitudinal changes in clinical outcomes occur with MDT rehabilitation and how do these results compare with patients with previous lower extremity trauma discharged prior to PDAFO availability? METHODS: We retrospectively evaluated levels of mobility, activities of daily living, anxiety, depression and pain in a heterogeneous group of 23 injured UK servicemen 34±11 months after PDAFO provision. We also retrospectively analysed 16 patients across four time points (pre-PDAFO provision, first, second and final inpatient admissions post-PDAFO provision) using identical outcome measures, plus the 6 min walk test. RESULTS: Outcomes were compared with previous below-knee limb salvage and amputees. Before PDAFO, 74% were able to walk and 4% were able to run independently. At follow-up, this increased to 91% and 57%, respectively. Mean depression and anxiety scores remained stable over time (p>0.05). After 3 weeks, all patients could walk independently (pre-PDAFO=31%). Mean 6 min walk distance significantly increased from 440±75 m (pre-PDAFO) to 533±68 m at last admission (p=0.003). The ability to run increased from 6% to 44% after one admission. CONCLUSIONS: All functional and most psychosocial outcomes in PDAFO users were superior to previous limb salvage and comparable to previous below-knee amputees. The PDAFO facilitated favourable short-term and medium-term changes in all clinical outcome measurements.
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