Showing papers on "Disturbance (geology) published in 1975"

Stability of linear flow

Abstract: It is shown that a finite disturbance independent of the streamwise coordinate may lead to instability of linear flow, even though the basic velocity does not possess any inflection point.

Direct observations of a flare related coronal and solar wind disturbance

Abstract: Numerous mass ejections from the Sun have been detected with orbiting coronagraphs Here for the first time we document and discuss the direct association of a coronagraph observed mass ejection, which followed a 2B flare, with a large interplanetary shock wave disturbance observed at 1 AU Estimates of the mass (24 × 1016 g) and energy content (11 × 1032 erg) of the coronal disturbance are in reasonably good agreement with estimates of the mass and energy content of the solar wind disturbance at 1 AU The energy estimates as well as the transit time of the disturbance are also in good agreement with numerical models of shock wave propagation in the solar wind

Stabilizing Control for Linear Systems with Bounded Parameter and Input Uncertainty

Abstract: We consider dynamical systems with norm-bounded uncertainty in (i) the system parameters (model uncertainty) or in (ii) the input (disturbance).

Soil Disturbance Associated with Timber Harvesting in Southwestern British Columbia

Abstract: Soil disturbance associated with timber harvesting was evaluated in five localities in southwestern British Columbia, along transects located away from main haul roads and associated sidecast soil

Gulls and Puffins on North Rona

Abstract: Observations on North Rona suggest that Puffins prefer to nest in steeply sloping cliffs rather than on the easier, 'inland' slopes. Although Great Black-backed Gulls are a strong disturbance factor, it is unlikely that they are the major cause of an apparent decline of the Puffin colonies.

Experimental studies on the pathogenesis of inner ear disturbance in renal diseases.

Abstract: Changements in structure and function of the inner ear are common observations in renal failure. Moreover it is well known that some pharmacological substances induce alterations as well in renal as in inner ear biology. Until today there is no interpretation why these both organs, ontogenetically completely different in development and function react on similar irritation. Aiming at identic ehangements in basement membrane configuration of stria vascularis and glomerular capillaries in Alport's syndrom we produced an allergic glomerulonephritis (Masngi-nephritis) by sensitizing rats with anti-basement-membraneserum against glomerular capillaries. 9 weeks after the injection the animals were perfused with 6.2~ glutaric aldehyde and prepared for electronmicroscopic study. The TME-examination of glomerular vessels and stria vessels revealed severe alterations in basement membrane configuration (augmentation in density, enlargement, collagen-like deposits). Comparing the basement membranes of brain-, heart-, liveror lungcapillaries we could not find similar alterations. Next to these findings the glomerula showed a plasma cell infiltration and also the lumina of the tubuli contorti were completely filled with plasma cells. In stria vaseularis we observed a loss of dark cells and swollen nuclei of the marginal ceils. In a control study fluorescein-labelled antibodies against basement membranes of glomerula capillaries were used. This examination showed the antigen-antibody-reaction located exclusively around the stria capillaries and around the glomerula vessels. An examination of the ionic composition of the inner ear fluids and a control of MP and DC-potentiMs in immnnizised animals are in preparation.

Correlates of initial client disturbance: expectations for therapy, dropout, resistance, and demographic description.

Abstract: Relationships were investigated between initial levels of client disturbance in each of 10 problem areas and client drop-out, lateness to, and absence from therapy, expectations with regard to therapy, and various demographic variables. Data were obtained from 154 outpatients at a university psychological clinic. Correlations computed between initial disturbance scores and all other variables revealed many significant relationships. Most noteworthy were the significant relationships betwee initial disturbance levels in the areas of future goals and self-satisfaction and expectations in a psychodynamically oriented therapist. Results were discussed in terms of client's awareness of the need to deal with the psychological factors that underlie their problems and their desire for the therapist to focus on such material.

Disturbance detection system

Abstract: PURPOSE:The peak value of disturbance wave is detected from output signal of logarithmic amplification detector of radar equipment. Thus, generation direction of disturbance electric wave is detected through distance detection, thus effectively carrying out disturbance prevention program.

Sensitivity of Surface Materials and Vegetation to Disturbance in the Queen Elizabeth Islands: An Approach and Commentary

Abstract: Concern about potential and actual disturbance of surface materials, vegetation and wildlife of the Queen Elizabeth Islands has risen sharply in the last few years. The purpose of this paper is to outline an approach to the problem, based on terrain studies, and to offer a commentary on the recent paper by T.A. Babb and L.C. Bliss in Arctic. … For a rational assessment of the problem, information is required on: a) surface materials - ice content, texture, engineering properties; b) topography and landforms; c) geomorphic processes; d) drainage - seasonal change and single events; e) vegetation - percentage cover and composition by species; f) summer temperatures, and moisture balance in soil; g) wildlife. … Surface materials are very significant elements of the terrain, especially when potential for disturbance is being considered. Hence, surface materials are used by the present writers as a nucleus around which other elements of the terrain are grouped. … Two of the present writers undertook in 1972 an exercise in the mapping of sensitivity at a scale of 1:500,000 of the Queen Elizabeth Islands, based primarily on bedrock maps and extensive personal communications, but found it unsatisfactory because the degree of detail was insufficient to reflect the variability in the sensitivity of the terrain. … [In evaluating the paper by Babb and Bliss, the present authors conclude that]: The overall objective of these authors in emphasizing the "susceptibility of the soils and vegetation to surface disturbance" is good. However the methods used to achieve this objective are inconsistent, and in several cases the results are inaccurate. A serious deficiency is that the criteria for determining categories of "susceptibility" are obscure. … The "Polar Desert" category is described as an area with 10% or less plant cover, low susceptibility to disturbance and low ground ice content. One interpretation of this seems to be that poorly-vegetated areas are less susceptible to disturbance of vegetation than are more densely vegetated areas. Only in so far as a low plant density lessens the probability of direct impact of vehicles on plants is this interpretation obviously true. A sparsely vegetated area may be an important, or even critical, range for ungulates; therefore the effect of disturbance of it could be great. The type of vegetation - such as willow, sedge, saxifrage, grass or bryophyte - is a vital consideration. An alternative interpretation is that unvegetated areas (90% of the Polar Desert category, classed as "soils") have a low sensitivity to surface disturbance. This is not true for some major areas of both eastern Melville Island and Western Ellesmere Island where highly sensitive surfaces, almost devoid of vegetation, are subject to extensive slope failure or thermokarst development, even without disturbance. Where the authors have left their major field of expertise and have commented on geology and geomorphology, weaknesses are evident. They appear to draw a direct relationship between active-layer soil moisture and "susceptibility". For overland travel this is generally true, but if excavation penetrates the shallow active layer and the frost table, then the relationship certainly no longer holds. Furthermore, the implication of a relationship between susceptibility, ice content and vegetation cover is simplistic and can be misleading. The assertion that "10% or more vegetation cover indicates the existence of sufficient moisture for the segregation of horizontal ice layers" is without basis. The present writers have drilled over 300 shallow (1-6 m) holes in eastern Melville Island and western Ellesmere Island to evaluate ice content and have found the relationship between vegetation, ground ice and materials to be complex. …

System disturbance detector

Abstract: PURPOSE: To prevent erroneous function of system disturbance detector by performing summarized detection of various components indicating system condition. COPYRIGHT: (C)1977,JPO&Japio

Disturbance-rejection characteristics of linear discrete-time systems incorporating integral feedback

Abstract: Explicit criteria are derived that indicate clearly the extent to which constant disturbances can be rejected by the judicious introduction of integral feedback in discrete-time systems.

Magnetic record play equipment

Abstract: PURPOSE: Disturbance of played pictures is eliminated by removing the generation of discontinued sections of splices when again starting recording after a stop in VTR. COPYRIGHT: (C)1976,JPO&Japio

Colour Disturbance as a Symptom

Abstract: SIR,-MacConkey's medium was intentionally made inhibitory so as to simplify work with Gram-negative bacteria of faecal origin. Some Gram-positive organisms will not grow on it at all, and the speed and profusion of growth of those that will are markedly altered by minor variations in its formulation. For this reason Mr. R. Hole's doubts (19 July, p. 160) about the use of CLED medium for urinary bacteriology, and his inference that MacConkey's medium is superior to it for this purpose, should not be accepted uncritically, because the exclusive use of MacConkey's medium must perpetuate a narrow view of the possible range of urinary pathogens. The significance of Gram-positive organisms other than Streptococcus faecalis as causes of urinary tract infection has attracted rather low-key attention for many years, but the pathogenic role of certain strains of coagulase-negative staphylococci seems now as firmly based as is that of Escherichia coli. There is thus a good reason for suggesting that a non-selective medium like CLED should always be used in urinary bacteriology in preference to an inhibitory medium like MacConkey's. To take the opposite view is to extinguish not only a number of potential pathogens, but also the possibility of argument about them.-I am, etc., P. D. MEERS Public Health Laboratory Plymouth, Devon

The Treatment of Sexual Disturbance

Abstract: The thesis of this paper is that the highly competent marriage and family therapist had better have good understanding of both general disturbance and sexual disturbance. A case illustration of an individual with a sexual disturbance is given. Editor.

Colour Disturbance as a Symptom

Abstract: several reasons such investigations have thrown little light on the pathogenesis of these diseases. Firstly, the results have been remarkably divergent-mostly owing to the technical factors already discussed. Secondly, it is not yet clear to what extent abnormal patterns in lymphocyte subpopulations are entirely and non-specifically secondary to disease activity; in particular, the sequestration of lymphocytes in diseased tissues may well distort the picture in the peripheral blood. Finally, no unequivocal, obviously important abnormality has been demonstrated in any one of these diseases. This contrasts with other diseases in which measuring lymphocyte subpopulations is of diagnostic value. Thus the lymphocytes in the blood of patients with chronic lymphatic leukaemia predominantly possess B-lymphocyte markers, and in congenital thymus deficiency lymphocytes with T-cell markers are markedly reduced in number. Indeed, the T-lymphocytes of some patients with hypogammaglobulinaemia have been shown to have abnormally low levels of immunoglobulin synthesis in vitro.14 Methods are still lacking which might show immunological aberrations in lymphocyte subpopulations in other diseases. The sort of technique needed to test the functional capacity of different subpopulations in normal and diseased subjects is the ability to initiate antibody responses in lymphoid cells of human origin.15 Present research methods of evaluating these cells in man are an imperfect first step in a developing process.16 Their introduction into clinical investigation at this stage would, for the most part, be premature and of unproved value.

Psychiatric disturbance with acute onset and offset in a Darwin evacuee.

Abstract: A case of transient situational disturbance in a Darwin evacuee is presented in order to place on record the nature of and the circumstances associated with a "breakdown" following the patient's evacuation form Darwin as a result of cyclone Tracy. The apparently gross behavioural disturbance was rapidly resolved after the involvement of a number of people willing, and apparently able, to provide help, without resort to hospitalization or medication. Language: en