scholarly journals An exploration of the relationship of chemical and physical parameters in the micromechanical characterisation of the apparent interfacial strength in glass fibre epoxy systems

2016 ◽  
Vol 139 ◽  
pp. 012048 ◽  
Author(s):  
J L Thomason ◽  
L Yang ◽  
D Bryce ◽  
R Minty
Keyword(s):  
Glass Fibre ◽  
Interfacial Strength ◽  
Physical Parameters ◽  
Relationship Of ◽  
The Relationship ◽  
Epoxy Systems

scholarly journals FORMATION OF MATHEMATICAL APPARATU FOR THE METHODOLOGY OF EMERGENCY PREVENTION ON SOLID WASTE LANDFILL WITH TECHNOLOGICAL EQUIPMENT

2020 ◽  
Vol 1 (154) ◽  
pp. 100-107 ◽  
Author(s):  
N. Rashkevich
Keyword(s):  
Mathematical Model ◽  
Solid Waste ◽  
Living Conditions ◽  
Analytical Dependence ◽  
Load Force ◽  
Physical Parameters ◽  
Technological Equipment ◽  
Waste Landfill ◽  
Relationship Of ◽  
The Relationship

The landfill with technological equipment becomes a clear danger of emergencies. The dangerous factors of emergencies there is landslides of waste mass, explosion of biogas on technological equipment. Modern scientific research aimed at establishing the laws of soil mechanics, obtaining the maximum amount of methane in the biogas composition, an unresolved part of the problem of ensuring civil security is the lack of an adequate method of emergency prevention. In the course of research, by the author was developed a mathematical model of emergency prevention on solid waste landfill with technological equipment. The mathematical model consists of an equation that describes the number of casualties due to an emergency and an equation that describes the existence of solutions to separate problems of estimating the conditions for determining the density, humidity, temperature of the waste mass. The desired solution of a separate problem is an analytical dependence that describes the relationship of the density of the waste mass in accordance with the variation of the physical parameters of the load force, porosity, height of waste storage. The desired solution of a separate problem is an analytical dependence that describes the relationship of the humidity of the waste mass in accordance with the variation of the input and visible fluid flows, density. The desired solution of a separate problem is an analytical dependence that describes the relationship of the temperature of the waste mass in accordance with the variation of the amount of heat supplied, generated, discharged. The number of people affected by an emergency is less than the objective level of the effects of the hazard, and the number of people with impaired living conditions is less than or equal to the objective level. Emergency prevention involves a set of measures aimed at preventing an increase in the number of victims, casualties, and persons with impaired living conditions from an object level to a higher level. Keywords: solid waste landfill, emergency, temperature, humidity, density.

Sinusitis in Status Asthmaticus

1994 ◽  
Vol 33 (12) ◽  
pp. 712-719 ◽  
Author(s):  
Catherine G. Fuller ◽  
Joyce J. Schoettler ◽  
Vicente Gilsanz ◽  
Marvin D. Nelson ◽  
Joseph A. Church ◽  
...  
Keyword(s):  
Otitis Media ◽  
Status Asthmaticus ◽  
Chronic Otitis Media ◽  
Clinical Findings ◽  
Physical Parameters ◽  
History Of ◽  
Physical Findings ◽  
Age Range ◽  
Relationship Of ◽  
The Relationship

The relationship between sinusitis and status asthmaticus (SA) remains obscure. The purposes of this study were to determine the prevalence of abnormal sinus radiographs (SXRs) and investigate possible risk factors among unselected children admitted with SA. Eighty-eight patients over 2 years of age (range 2 to 16 years) consecutively admitted with SA were studied. The principal investigator, blinded to SXR findings, interviewed and examined the patients with respect to 10 physical parameters and 14 historical parameters. Two staff radiologists, blinded to the clinical findings, interpreted the SXRs. Relationship of historical and physical findings with positive SXRs was determined by statistical analysis. Twenty-seven percent of patients were found to have abnormal SXRs, manifesting two thirds or greater opacification of the sinuses. The mean age, sex, and race of patients with abnormal SXRs was not significantly different from those with normal films. A history of two or more admissions per year for SA, and, in children under 5 years of age, a history of chronic otitis media, and the physical finding of otitis media were significantly more frequent among patients with abnormal SXRs. Although not found to be statistically significant, a history of sinusitis and cough occurred more frequently in association with abnormal SXRs.

Scaling of Perceived Optical Distortion

1980 ◽  
Vol 24 (1) ◽  
pp. 622-625
Author(s):  
Frank E. Ward ◽  
Daniel F. Quinn
Keyword(s):  
Sine Wave ◽  
Physical Parameters ◽  
Physical Stimulus ◽  
Dissimilarity Index ◽  
Stimulus Attribute ◽  
Scaling Procedure ◽  
Psychological Scales ◽  
Third Dimension ◽  
Relationship Of ◽  
The Relationship

When observers make subjective judgments about a physical stimulus attribute, one is studying the relationship between physical and psychological scales. If the physical stimulus is clearly multidimensional, the relationship of the physical and psychological scales is not always obvious. We have carried out two studies to explore scaling of patterns that simulate optically induced visual distortions. In the first study, subjects rank-ordered computer generated sine wave patterns in order of distortion severity. The rankings corresponded to the physical parameters of frequency and amplitude. In the second study, all possible pairs of 48 stimuli were rated on a dissimilarity index. The data were analyzed by a non-metric multidimensional scaling procedure. We found that a third dimension, in addition to frequency and amplitude was necessary to adequately describe the data.

scholarly journals Parker Solar Probe Observations of a Dust Trail in the Orbit of 3200 Phaethon

2020 ◽  
Author(s):  
Karl Battams ◽  
Guillermo Stenborg ◽  
Russell Howard ◽  
Brendan Gallagher ◽  
Matthew Knight ◽  
...  
Keyword(s):  
White Light ◽  
Surface Brightness ◽  
Meteor Shower ◽  
Physical Parameters ◽  
Wide Field ◽  
Trail Following ◽  
Dust Trail ◽  
Visual Magnitude ◽  
Relationship Of ◽  
The Relationship

<p>We present details on the first white-light detection of a dust trail following the orbit of asteroid 3200 Phaethon, seen in images recorded by the Wide-field Imager for Parker Solar Probe (WISPR) instrument on the NASA Parker Solar Probe (PSP) mission. In this talk we will present a brief introduction to the PSP mission and the WISPR instrument. We will then show observations returned by WISPR in multiple perihelion 'encounters' that clearly show a diffuse dust trail perfectly aligned with the perihelion portion of the orbit of 3200 Phaethon, recorded while the asteroid itself was near aphelion. We will discuss the physical parameters that we have derived for the dust trail, including its visual magnitude, surface brightness and mass. We also speculate on the relationship of this trail to the Geminid meteor shower, of which Phaethon is assumed to be the parent, and demonstrate why the trail has not been detected visually until now, despite a number of dedicated observing campaigns. We also hope to present initial analyses of the most recent set of WISPR observations (January 2020), where we anticipate the trail should again be visible in the WISPR observations.</p>

Roadway-Vehicle Interaction, Physical Indexes, and Human Judgment of Ride Quality

1997 ◽  
Vol 1570 (1) ◽  
pp. 55-59 ◽  
Author(s):  
Chiu Liu ◽  
Robert Herman
Keyword(s):  
Ride Quality ◽  
Physical Parameters ◽  
Human Judgment ◽  
International Roughness Index ◽  
Moving Vehicle ◽  
Roughness Index ◽  
Static Profile ◽  
Relationship Of ◽  
The Relationship ◽  
Analytical Expressions

Present serviceability index (PSI) modeling has been an important subject for decades. Other dynamic indexes characterizing a roadway such as the international roughness index (IRI), averaged rectified slope (ARS), and averaged rectified speed (ARV) have been proposed and studied. However, the roles played by these indexes in the interaction between road, vehicle, and human ratings have not been made clear. A unified physical model linking the static profile of a roadway and the dynamic response of a vehicle to the profile to the serviceability index of the roadway is presented here. Analytical expressions for jerk index, acceleration index, ARV, ARS, and IRI are derived from the developed model in terms of the physical parameters for roadways and the dynamic characteristics of a vehicle. Then a linear relation between the PSI and the logarithm of the jerk index is proposed. Using the jerk index computed from field profile data, the linear functional form for the PSI is verified, and regression R2 values higher than 0.94 are obtained for various types of pavements. The same analysis is performed for other dynamic indexes, and the R2 values are found to be approximately in the range from 0.70 to 0.80. These results indicate that the theoretical model correctly predicts and explains the human rating of ride quality and that the jerk experienced by raters in a moving vehicle dictates the ratings. Moreover, the relationship of the static parameters of roadway profiles with human ratings is discussed using the conventional approach.

The relationship of the scleractinian corals to the rugose corals

Paleobiology ◽  
1980 ◽  
Vol 6 (02) ◽  
pp. 146-160 ◽  
Author(s):  
William A. Oliver
Keyword(s):  
Critical Points ◽  
Scleractinian Corals ◽  
Convincing Evidence ◽  
Early Triassic ◽  
Rugose Corals ◽  
History Of ◽  
The Subject ◽  
Relationship Of ◽  
The Relationship ◽  
Biologic Factors

The Mesozoic-Cenozoic coral Order Scleractinia has been suggested to have originated or evolved (1) by direct descent from the Paleozoic Order Rugosa or (2) by the development of a skeleton in members of one of the anemone groups that probably have existed throughout Phanerozoic time. In spite of much work on the subject, advocates of the direct descent hypothesis have failed to find convincing evidence of this relationship. Critical points are:(1) Rugosan septal insertion is serial; Scleractinian insertion is cyclic; no intermediate stages have been demonstrated. Apparent intermediates are Scleractinia having bilateral cyclic insertion or teratological Rugosa.(2) There is convincing evidence that the skeletons of many Rugosa were calcitic and none are known to be or to have been aragonitic. In contrast, the skeletons of all living Scleractinia are aragonitic and there is evidence that fossil Scleractinia were aragonitic also. The mineralogic difference is almost certainly due to intrinsic biologic factors.(3) No early Triassic corals of either group are known. This fact is not compelling (by itself) but is important in connection with points 1 and 2, because, given direct descent, both changes took place during this only stage in the history of the two groups in which there are no known corals.

Skeletal elements of crinoid echinoderms: High-resolution structural and microanalytical results

1983 ◽  
Vol 41 ◽  
pp. 194-195
Author(s):  
D. F. Blake ◽  
L. F. Allard ◽  
D. R. Peacor
Keyword(s):  
High Resolution ◽  
Marine Invertebrates ◽  
Sea Urchins ◽  
Structural Features ◽  
Sea Stars ◽  
High Resolution Tem ◽  
Relationship Of ◽  
The Relationship ◽  
Insight Into

Echinodermata is a phylum of marine invertebrates which has been extant since Cambrian time (c.a. 500 m.y. before the present). Modern examples of echinoderms include sea urchins, sea stars, and sea lilies (crinoids). The endoskeletons of echinoderms are composed of plates or ossicles (Fig. 1) which are with few exceptions, porous, single crystals of high-magnesian calcite. Despite their single crystal nature, fracture surfaces do not exhibit the near-perfect {10.4} cleavage characteristic of inorganic calcite. This paradoxical mix of biogenic and inorganic features has prompted much recent work on echinoderm skeletal crystallography. Furthermore, fossil echinoderm hard parts comprise a volumetrically significant portion of some marine limestones sequences. The ultrastructural and microchemical characterization of modern skeletal material should lend insight into: 1). The nature of the biogenic processes involved, for example, the relationship of Mg heterogeneity to morphological and structural features in modern echinoderm material, and 2). The nature of the diagenetic changes undergone by their ancient, fossilized counterparts. In this study, high resolution TEM (HRTEM), high voltage TEM (HVTEM), and STEM microanalysis are used to characterize tha ultrastructural and microchemical composition of skeletal elements of the modern crinoid Neocrinus blakei.

Studies on Leukemogenic and Sarcomagenic Viruses

1970 ◽  
Vol 28 ◽  
pp. 156-157
Author(s):  
Leon Dmochowski
Keyword(s):  
Electron Microscopy ◽  
Electron Microscope ◽  
Morphological Properties ◽  
Mode Of Development ◽  
Relationship Of ◽  
The Relationship

Electron microscopy has proved to be an invaluable discipline in studies on the relationship of viruses to the origin of leukemia, sarcoma, and other types of tumors in animals and man. The successful cell-free transmission of leukemia and sarcoma in mice, rats, hamsters, and cats, interpreted as due to a virus or viruses, was proved to be due to a virus on the basis of electron microscope studies. These studies demonstrated that all the types of neoplasia in animals of the species examined are produced by a virus of certain characteristic morphological properties similar, if not identical, in the mode of development in all types of neoplasia in animals, as shown in Fig. 1.

The relationship of IGE receptor topography to signaling activity in RBL-2H3 mast cells

1991 ◽  
Vol 49 ◽  
pp. 236-237
Author(s):  
J.R. Pfeiffer ◽  
J.C. Seagrave ◽  
C. Wofsy ◽  
J.M. Oliver
Keyword(s):  
Mast Cells ◽  
Protein A ◽  
Scattered Electron ◽  
Ige Receptor ◽  
Receptor Complexes ◽  
Ige Binding ◽  
Electron Imaging ◽  
Small Clusters ◽  
Relationship Of ◽  
The Relationship

In RBL-2H3 rat leukemic mast cells, crosslinking IgE-receptor complexes with anti-IgE antibody leads to degranulation. Receptor crosslinking also stimulates the redistribution of receptors on the cell surface, a process that can be observed by labeling the anti-IgE with 15 nm protein A-gold particles as described in Stump et al. (1989), followed by back-scattered electron imaging (BEI) in the scanning electron microscope. We report that anti-IgE binding stimulates the redistribution of IgE-receptor complexes at 37“C from a dispersed topography (singlets and doublets; S/D) to distributions dominated sequentially by short chains, small clusters and large aggregates of crosslinked receptors. These patterns can be observed (Figure 1), quantified (Figure 2) and analyzed statistically. Cells incubated with 1 μg/ml anti-IgE, a concentration that stimulates maximum net secretion, redistribute receptors as far as chains and small clusters during a 15 min incubation period. At 3 and 10 μg/ml anti-IgE, net secretion is reduced and the majority of receptors redistribute rapidly into clusters and large aggregates.

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