scholarly journals Infra-red (IR-spectra) of certain sulphides and analogous binary compounds in the long-wave region

1973 ◽  
Author(s):  
A H Gillieson
Keyword(s):  
Ir Spectra ◽  
Long Wave ◽  
Infra Red ◽  
Wave Region ◽  
Binary Compounds

Propagation of obliquely incident water waves over a trench

1983 ◽  
Vol 133 ◽  
pp. 47-63 ◽  
Author(s):  
James T. Kirby ◽  
Robert A. Dalrymple
Keyword(s):  
Numerical Solution ◽  
Water Waves ◽  
Analytic Solution ◽  
Small Scale ◽  
Obliquely Incident ◽  
Long Wave ◽  
Propagating Waves ◽  
Tank Experiment ◽  
Wave Region ◽  
Wave Limit

The diffraction of obliquely incident surface waves by an asymmetric trench is investigated using linearized potential theory. A numerical solution is constructed by matching particular solutions for each subregion of constant depth along vertical boundaries; the resulting matrix equation is solved numerically. Several cases where the trench-parallel wavenumber component in the incident-wave region exceeds the wavenumber for freely propagating waves in the trench are investigated and are found to result in large reductions in wave transmission; however, reflection is not total owing to the finiteness of the obstacle.Results for one case are compared with data obtained from a small-scale wave-tank experiment. An approximate solution based on plane-wave modes is derived and compared with the numerical solution and, in the long-wave limit, with a previous analytic solution.

Iceberg Detection in Low Visibility Conditions via Infra-Red Sensors: Processing and Modelling of Field Data

2017 ◽  
Author(s):  
Grégory Bouquet ◽  
Helene Schulerud ◽  
Francesco Scibilia
Keyword(s):  
Optical Properties ◽  
Numerical Modelling ◽  
Field Data ◽  
Radiation Transfer ◽  
Short Wave ◽  
Long Wave ◽  
Infra Red ◽  
Low Visibility ◽  
Imaging Sensors ◽  
Modelling Study

This article deals with Short Wave Infra-Red (SWIR) and Long Wave Infra-Red (LWIR) imaging sensors for detecting icebergs in harsh metocean conditions. Field data acquired during the Statoil Offshore Newfoundland Research Expedition 2015 (ONRE15) is analyzed. The analysis is supported by a numerical modelling study which aims at simulating the optical properties of ice and water combined with the radiation transfer in the Infra Red.

scholarly journals Infra-red Radiation and Nasal Obstruction

1935 ◽  
Vol 35 (2) ◽  
pp. 185-198 ◽  
Author(s):  
H. A. E. van Dishoeck
Keyword(s):  
Nasal Obstruction ◽  
Short Wave ◽  
Nasal Passage ◽  
Surface Cooling ◽  
Local Overheating ◽  
Long Wave ◽  
Infra Red ◽  
The Hill ◽  
Red Radiation ◽  
Selection Of

For the investigation of the Hill phenomenon, viz. the antagonism of short-and long-wave infra-red radiation in their influence on nasal obstruction, the commonly used rhinomanometric technique is not well suited. In this paper a new procedure is described, in which an air current is blown through the nose. In this way the nasal passability may be estimated, independent of respiratory movements. It proved to be desirable to make a selection of suitable experimental subjects with the aid of adrenaline and histamine tests; only those persons in which the opening by adrenaline and the narrowing by histamine sprays were clearly demonstrable were chosen.Long-wave infra-red rays constantly caused nasal obstruction.The shorter waves were much weaker in their shutting effect, and also decreased the narrowing of the nose when they were given in combination with the long-wave rays of an electric fire.A nasal passage closed by long-wave infra-red radiation may be partly opened by the short-wave rays; the possibility of surface cooling being the opening factor was excluded.Artificial cooling of the skin has a very marked opening influence.It is suggested that nose-opening and nose-shutting are correlated with cooling and heating of the Malpighian layer. Long infra-red rays will be completely absorbed in the layer and cause capillary stasis with local overheating. The shorter waves for the greater part penetrate more deeply; the skin reacts by an active hyperaemia, which, by relatively cooling the overheated Malpighian layer, has the same effect as a cooling from without.

The long-wave behaviour of the virtual mass in water of finite depth

1980 ◽  
Vol 372 (1748) ◽  
pp. 65-91 ◽  
Keyword(s):  
Circular Cylinder ◽  
Finite Depth ◽  
Virtual Mass ◽  
Constant Depth ◽  
Long Wave ◽  
Wave Region ◽  
Zero Frequency ◽  
Finite Constant

A half-immersed circular cylinder of radius a undergoes a periodic heaving motion on water of finite constant depth h . The behaviour of the virtual mass is considered in the long-wave region where existing computations are in disagreement. For finite depth Ursell has recently confirmed analytically that the virtual mass remains finite (and is thus a function of a/h ) in the limit Ka = Kh = 0, a/h fixed. His long-wave investigation is now extended by a study of the gradient /d( virtual mass)/d(Aa) for small Ka . It is shown that this gradient is positive in the limit of zero frequency when a/h is sufficiently small, and that in this case the virtual mass has a maximum near Kh = 1. An argument is also given which suggests that this maximum may be expected for bodies of more general sections.

The bifurcation of steady gravity water waves in (R, S) parameter space

1995 ◽  
Vol 302 ◽  
pp. 287-305 ◽  
Author(s):  
S. H. Doole ◽  
J. Norbury
Keyword(s):  
Parameter Space ◽  
Water Waves ◽  
Pressure Head ◽  
Wave Theory ◽  
Periodic Waves ◽  
Long Wave ◽  
S Parameter ◽  
Stokes Waves ◽  
Wave Region ◽  
Constant Period

The bifurcation of steady periodic waves from irrotational inviscid streamflows is considered. Normalizing the flux Q to unity leaves two other natural quantities R (pressure head) and S (flowforce) to parameterize the wavetrain. In a well-known paper, Benjamin & Lighthill (1954) presented calculations within a cnoidal-wave theory which suggested that the corresponding values of R and S lie inside the cusped locus traced by the sub- and supercritical streamflows. This rule has been applied since to many other flow scenarios. In this paper, regular expansions for the streamfunction and profile are constructed for a wave forming on a subcritical stream and thence values for R and S are calculated. These describe, locally, how wave brances in (R, S) parameter space point inside the streamflow cusp. Accurate numerics using a boundry-integral solver show how these constant-period branches extend globally and map out parameter space. The main result is to show that the large-amplitude branches for all steady Stokes’ waves lie surprisingly close to the subcritical stream branch, This has important consequences for the feasibility of undular bores (as opposed to hydraulic jumps) in obstructed flow. Moreover, the transition from the ‘long-wave region’ towards the ‘deep-water limit’ is char-acterized by an extreme geometry, bith of the wave branches and how they sit inside each other. It is also shown that a single (Q, R, S) trriple may represent more than one wave since the global branches can overlap in (R, S) parameter space. This non-uniqueness is not that associated with the known premature maxima of wave propertties as functions of wave amplitude near waves of greatest height.

Long-wave IR spectra and structure of copper acetylides

1975 ◽  
Vol 15 (4) ◽  
pp. 612-613
Author(s):  
L. V. Konovalov ◽  
V. S. Myl'nikov
Keyword(s):  
Ir Spectra ◽  
Long Wave ◽  
Copper Acetylides

A new view on the diagnosis of purulent-inflammatory diseases after childbirth

2017 ◽  
pp. 22-26
Author(s):  
O.V. Bulavenko ◽  
◽  
L.R. Ostapyuk ◽  
V.O. Rud ◽  
A.S. Voloshinovskii ◽  
...  
Keyword(s):  
Fluorescence Spectroscopy ◽  
Blood Serum ◽  
Postpartum Period ◽  
Treatment Process ◽  
Inflammatory Diseases ◽  
Serum Markers ◽  
Control Group ◽  
Long Wave ◽  
Wave Region ◽  
Torch Infections

Postpartum infectious diseases are ranked second (WHO, 2016) in the structure of maternal mortality and complicate postpartum period. Most of the existing methods allow to diagnose diseases in the presence of an already deployed clinical picture. The objective: of the work is to improve the diagnosis and prediction of pospartum endometritis by applying the method of fluorescence spectroscopy. Materials and methods. The main group is -120 women in the postpartum period with postpartum endometritis, the control group is 38 women with uncomplicated postpartum period. A study of their blood serum was carried out using the method of fluorescence spectroscopy. Results. Within the framework of the study, independent prognostic factors of the emergence of postpartum endometritis are inflammatory diseases of the lower department of the genital tract (p=0.01), abnormalities of labor (p=0.006) and TORCH infections (p=0.001). True markers for diagnosis of postpartum endometritis are the reduction in blood serum fluorescence intensity (IF) (p<0.0001) and the shift in magnitude lmax to the long-wave region (p=0.007). Conclusion. The use of spectrum-fluorescent blood serum markers in the comprehensive diagnosis of postpartum endometritis allows to diagnose reliably thе onset and to predict the course of the disease, including the treatment process. Key words: endometritis, postpartum purulent inflammatory diseases, method of fluorescence spectroscopy.

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