Two-phase, passive separator-and-filter assembly

Assembly separates liquid from gas by passive hydrophilic/hydrophobic material approach. Apparatus is comprised of porous glass hydrophilic tubes. Quantity, lateral size, and pore size of glass tubes are determined by particular design requirements with regard to water rate, water quality contamination level, application endurance life, and operating differential pressure level

Study of blood flow sensing with microwave radiometry

A study and experimental investigation has been performed to determine the feasibility of measuring regional blood flow and volume in man by means of microwave radiometry. An indication was expected of regional blood flow from measurement of surface and subsurface temperatures with a sensitive radiometer. Following theoretical modeling of biological tissue, to determine the optimum operating frequency for adequate sensing depth, a sensitive microwave radiometer was designed for operation at 793 MHz. A temperature sensitivity of of 0.06 K rms was realized in this equipment. Measurements performed on phantom tissue models, consisting of beef fat and lean beefsteak showed that the radiometer was capable of sensing temperatures from a depth between 3.8 and 5.1 cm. Radiometric and thermodynamic temperature measurements were also performed on the hind thighs of large dogs. These showed that the radiometer could sense subsurface temperatures from a depth of, at least, 1.3 cm. Delays caused by externally-generated RF interference, coupled with the lack of reliable blood flow measurement equipment, prevented correlation of radiometer readings with reginal blood flow. For the same reasons, it was not possible to extend the radiometric observations to human subjects

A procedure for assessing aircraft turbulence- penetration performance

Subsonic transport aircraft performance assessment during atmospheric turbulenc

A re-assessment of pagan Anglo-Saxon burials and burial rites in Wiltshire: Not available

Much valuable work has been done in the past in the field pf pagan Anglo-Saxon burials in the county of Wiltshire. However, new material is constantly being added to the corpus and many of the earlier publications and theories are now in need of re-assessment in the light of new discoveries both in the county and elsewhere. The material contained in this thesis includes sites found as of spring, 1976, including the unpublished sites at Blackpatch and Swallowcliffe Down. Unfortunately, there was no readily available information for the recent sites, there was no readily available information for the most recent sites, such as Collingbourne Ducis, and these are touched upon without being studied in detail. Past work in the field of cemetery and burial analysis has laid much of its emphasis upon the study of grave goods, their derivations, affinities, and chronology, often to the neglect of the burials themselves. This thesis attempts to place the grave goods in a role of secondary importance and to analyse the burials, themselves, and the information they may contain as to the life styles, community organisation and religious practices of the pagan Anglo-Saxons of Wiltshire, as its primary function. Some sixty-three sites of varying historical and archaeological value, were studied: cemeteries, single burials, primary and secondary barrow burials, and chance finds. Many of these were very poorly excavated and published and several have been noted as being of dubious date. However, each burial and burial place was investigated using fairly strict methods. Burials were catagorized by age, sex, orientation, position, location within groups and cemeteries, physical abnormalities, type of grave, and wealth. The sites were analysed as to overall orientation (s), position (s), sex and age ratios, position layout, geological and geographical position, grave shapes and types, and comparative wealth. This method allowed for convenient comparative study of any two ( or more ) sites in the group. It was discovered that several other fields on interest might also benefit from this work, most notable, settlement, affinity, and migration studies. Burial sites appear to relate directly to the geology and geography of their areas. Although these studies fall outside the chief goals of this thesis, it does include some work on possible migration routes, land usage, settlement ( as concerns burial sites ), possible tribal affinities within the group, and the development of land divisions (parishes). The study of pagan Anglo-Saxon burial rites is, to a large extent a neglected one, possible due to a lack of verifiable information and comparative material. Whilst any conclusions reached must remain hypothetical, there is much information concerning them to be gleaned through intensive examination of burials, burial modes and abnormalities and, in some cases, grave goods. Abnormalities such as burnt grain found in children’s graves and purposely broken weapons may shed light upon the religious beliefs of these people and upon their attitudes towards death and the dead. The internal organisation of burial places may serve to indicate social and community structure. Several of the larger cemeteries point towards a strong emphasis upon the family (headed by the male), each of which may have had its own burial plot within a larger communal cemetery. This is evident in the way in which the cemetery has been laid out and allowed to develop. Appendix III contains sites which may be eliminated from the corpus as being of inconclusive date, whilst Appendix IV is new rough chronology, for the Wiltshire sites. These may be of some value to others wishing to pursue the subject. In summation, the material found within this thesis has been organised and analysed with most of the emphasis placed upon the burials and burial rites themselves and how they may be used to compile information pertaining to the religious and sociological structures of pagan Anglo-Saxon communities, their tribal affinities, migration routes, settlement patterns, and, even, their physiognomies

A re-assessment of pagan Anglo-Saxon burials and burial rites in Wiltshire

Not availabl

PT-symmetry broken by point-group symmetry

We discuss a PT-symmetric Hamiltonian with complex eigenvalues. It is based on the dimensionless Schr\"{o}dinger equation for a particle in a square box with the PT-symmetric potential $V(x,y)=iaxy$. Perturbation theory clearly shows that some of the eigenvalues are complex for sufficiently small values of $|a|$. Point-group symmetry proves useful to guess if some of the eigenvalues may already be complex for all values of the coupling constant. We confirm those conclusions by means of an accurate numerical calculation based on the diagonalization method. On the other hand, the Schr\"odinger equation with the potential $V(x,y)=iaxy^{2}$ exhibits real eigenvalues for sufficiently small values of $|a|$. Point group symmetry suggests that PT-symmetry may be broken in the former case and unbroken in the latter one

Detection Techniques of Microsecond Gamma-Ray Bursts using Ground-Based Telescopes

Gamma-ray observations above 200 MeV are conventionally made by satellite-based detectors. The EGRET detector on the Compton Gamma Ray Observatory (CGRO) has provided good sensitivity for the detection of bursts lasting for more than 200 ms. Theoretical predictions of high-energy gamma-ray bursts produced by quantum-mechanical decay of primordial black holes (Hawking 1971) suggest the emission of bursts on shorter time scales. The final stage of a primordial black hole results in a burst of gamma-rays, peaking around 250 MeV and lasting for a tenth of a microsecond or longer depending on particle physics. In this work we show that there is an observational window using ground-based imaging Cherenkov detectors to measure gamma-ray burst emission at energies E greater than 200 MeV. This technique, with a sensitivity for bursts lasting nanoseconds to several microseconds, is based on the detection of multi-photon-initiated air showers.Comment: accepted for publication in the Astrophysical Journa

Inverse Compton Emission from Galactic Supernova Remnants: Effect of the Interstellar Radiation Field

The evidence for particle acceleration in supernova shells comes from electrons whose synchrotron emission is observed in radio and X-rays. Recent observations by the HESS instrument reveal that supernova remnants also emit TeV gamma-rays; long awaited experimental evidence that supernova remnants can accelerate cosmic rays up to the ``knee'' energies. Still, uncertainty exists whether these gamma-rays are produced by electrons via inverse Compton scattering or by protons via neutral pion decay. The multi-wavelength spectra of supernova remnants can be fitted with both mechanisms, although a preference is often given to neutral pion decay due to the spectral shape at very high energies. A recent study of the interstellar radiation field indicates that its energy density, especially in the inner Galaxy, is higher than previously thought. In this paper we evaluate the effect of the interstellar radiation field on the inverse Compton emission of electrons accelerated in a supernova remnant located at different distances from the Galactic Centre. We show that contribution of optical and infra-red photons to the inverse Compton emission may exceed the contribution of cosmic microwave background and in some cases broaden the resulted gamma-ray spectrum. Additionally, we show that if a supernova remnant is located close to the Galactic Centre its gamma-ray spectrum will exhibit a ``universal'' cutoff at very high energies due to the Klein-Nishina effect and not due to the cut-off of the electron spectrum. As an example, we apply our calculations to the supernova remnants RX J1713.7-3946 and G0.9+0.1 recently observed by HESS.Comment: 4 pages, 4 figures. Uses emulateapj.cls. Accepted by ApJ