Novel horn antenna reduces side lobes, improves radiation pattern

A horn antenna, combining two propagation modes at selected power ratios, reduces side lobes, and improves the radiation characteristics. Noise and unwanted signals are considerably suppressed

Angelology in situ : recovering higher-order beings as emblems of transcendence, immanence and imagination

The aim of this study is twofold: to identify the theological purpose underlying the depiction of angels at certain key points in the history of their use, and to explore how far that deeper theological rationale can be re-appropriated for our own day. This study first traces the progression of the angelic motif in the Hebrew Scriptures. By examining numerous pericopes in the Pentateuch, major prophets and Daniel, I demonstrate that the metamorphosis of higher-order beings like the angel of the Lord, cherubim and seraphim, is directly related to the writers’ desire to enhance God’s transcendence. Next, I evaluate pseudo-Denys’ hierarchical angelology, which prominent theologians like Luther and Calvin condemned as little more than a Neoplatonic scheme for accessing God through angels. I propose that not only has pseudo-Denys’ Neoplatonism been overstated, but that his angelology is particularly noteworthy for the way it accentuates Christ’s eucharistic immanence to the Church. Then I maintain that because assessments of Aquinas’ angelology are often based upon the Summa Theologiae, his views are wrongly portrayed as overtly philosophical, rather than biblical and exegetical. In his lesser-known biblical commentaries, however, Aquinas pushes the semantic range of the word ‘angel’ to include aspects of the physical world, which unveils an imaginative, Christocentric, and scriptural dimension of his angelology that is rarely acknowledged. The conclusion considers how contemporary figures and movements relate to these three angelologies. Barth emphasises the transcendent God but unlike Hebrew Scripture, weakens connections between God and angels. New Ageism affirms the immanent angel but unlike pseudo-Denys, does so at the expense of Christology and ecclesiology. Contemporary ecological discourse generally lacks Aquinas’ appreciation for an imaginative, supernatural approach to the world. Finally, I ground the angels’ relationship to transcendence, immanence and imagination in an experiential, eucharistic context

Redesigning Nursing Education: Lessons Learned from the Oregon Experience

Offers evaluation findings, lessons learned, and guidance from a coalition of community colleges and university nursing programs that offer a standard competency-based curriculum to enable students to make a seamless transition and raise skill levels

Cassegrainian antenna subflector flange for suppressing ground noise Patent

Cassegrain antenna subreflector flange for suppressing ground noise and increasing antenna transmitting efficienc

Saturation of interband absorption in graphene

The transient response of an intrinsic graphene, which is caused by the ultrafast interband transitions, is studied theoretically for the range of pumping correspondent to the saturated absorption regime. Spectral and temporal dependencies of the photoexcited concentration as well as the transmission and relitive absotption coefficients are considered for mid-IR and visible (or near-IR) spectral regions at different durations of pulse and broadening energies. The characteristic intencities of saturation are calculated and the results are compared with the experimental data measured for the near-IR lasers with a saturable absorber. The negative absorption of a probe radiation during cascade emission of optical phonons is obtained.Comment: 7 pages, 7 figure

Multi-tow shearing mechanism for high-speed manufacturing of variable angle tow composites

An innovative tow steering technique using shear deformation characteristics of the dry tow material has been developed to minimize the process-induced defects by changing the most fundamental way of handling tow materials of all conventional AFP techniques, and was named as ‘CTS (Continuous Tow Shearing)’. The objective of this research was to improve the productivity of the CTS process by using the stitched unidirectional non-crimped fabric (NCF) with multiple carbon tows rather than a single carbon tow and eliminating the in-situ impregnation process with slow process speed. A prototype of the CTS head module with a wide feed mechanism for the NCF and the resin film was developed and installed on a prepreg cutting machine for process validation

Choice of antenna geometry for microwave power transmission from solar power satellites

A comparison is made between square and circular transmitting antennas for solar power satellite microwave power transmission. It is seen that the exclusion zone around the rectenna needed to protect populations from microwaves is smaller for a circular antenna operating at 2.45 GHz than it is for a square antenna at that frequency. If the frequency is increased, the exclusion zone size remains the same for a square antenna, but becomes even smaller for a circular antenna. Peak beam intensity is the same for both antennas if the frequency and antenna area are equal. The circular antenna puts a somewhat greater amount of power in the main lobe and somewhat less in the side lobes. Since rain attenuation and atmospheric heating remain problems above 10 GHz, it is recommended that future solar power satellite work concentrate on circular transmitting antennas at frequencies of roughly 10 GHz