scholarly journals Difference in the Relationship of Magnitude to Frequency of Occurrence between Aftershocks and Foreshocks for an Earthquake of Magnitude 5. 1 in Central Japan

1969 ◽  
Vol 20 (2) ◽  
pp. 175-187 ◽  
Author(s):  
Shigeji Suyehiro
1966 ◽  
Vol 56 (1) ◽  
pp. 185-200
Author(s):  
Shigeji Suyehiro

abstract When a relatively small perceptible earthquake occurred near a tripartite net of high sensitivity in central Japan, a substantial difference was found between its 25 foreshocks and 173 aftershocks in the relation of frequency of occurrence and magnitude. For that study the coefficient “b” in the magnitude versus frequency equation is 0.35 for the former and 0.76 for the latter. A similar investigation has been carried out on the great Chilean earthquake of 1960, also accompanied by many foreshocks and aftershocks. Using four sensitive and suitably located U.S.C.G.S. stations, Eureka, Tucson, South Pole, and Byrd, foreshocks and aftershocks were located in addition to those reported by U.S.C.G.S. or B.C.I.S. Forty-five foreshocks and 250 aftershocks were found in a period of 33 hours before and 33 hours after the main shock. The same characteristic found for the Japanese earthquake was also found for the Chilean earthquake; i.e. the foreshocks showed a different picture from the aftershocks for the frequency of occurrence, and an appreciably smaller value seems to be valid for “b” of the foreshocks.


Author(s):  
Naomi Ekas ◽  
Thomas L. Whitman

Abstract Researchers examining the relationship of autism symptomatology and maternal stress have defined symptomatology in terms of level of severity, frequency of occurrence, or symptom type. In the present study, the relationship of maternal perceptions of these dimensions, along with a fourth, symptom diversity, and negative and positive indices of maternal socioemotional functioning was evaluated. Results indicate that each of these symptom dimensions was correlated with most of the measures of negative socioemotional status, together accounting for a substantial portion of the variance in these outcomes. The dimensions were especially robust predictors of negative but not positive maternal outcomes. The need for a systematic multidimensional assessment to evaluate autism symptomatology and its social impact was discussed.


1980 ◽  
Vol 47 (3_suppl) ◽  
pp. 1195-1198
Author(s):  
Iliana M. Castillo

The relationship between stressful life events and adolescents' employment was studied using Coddington's Social Readjustment Rating Questionnaire for Adolescents. The amount of stress reported by those 52 health care and industrial work-study occupational programs was significantly greater than that of 31 unemployed students and 43 students in other work-study programs. The results are compared with data from previous studies of adolescent normal and psychiatric patients. Frequency of occurrence and positive and negative connotations of the life events are also discussed.


2021 ◽  
Author(s):  
Marina Evgen'evna Valiullina ◽  
Irina Sergeevna Reshetnikova

The study is devoted to the study of the structure of the interconnections of the components of the "I" -image of students with the various mental states they experience in the context of studying at a university. Students determined the severity of the components of the "I" -image in three time continua - in the past (1st year), in the present (3rd year), in the future (4th year). They also determined the frequency of occurrence of mental states during the first two years of study using a special questionnaire. Then a correlation analysis was carried out, which made it possible to find relationships with a high level of reliability between the components of the "I" -image of students and some mental states experienced in two educational situations, which differ qualitatively depending on the time continuum. Based on the results obtained, conclusions were drawn about the presence of relationships, thanks to which it is possible to exert a certain influence on the experienced mental sta


Author(s):  
Cynantia Rachmijati ◽  
Sri Supiah Cahyati

According to ACDP Indonesia, many gender bias contents found in textbooks Bahasa Inggris in Indonesia settings. This study aims at examining the representation of gender on “BahasaInggriskelas X” by Kemendiknas. The criteria of a good textbook should show the relationship of women and men in society based on their role, status, environment, culture and community structures which are displayed in the form of illustrations and descriptions of the sentence. Findings from the book regarding Text: 4,11% visual characters, 28,77%  characters mentioned, 57,54% social activities, and 9,58% domestic activity. While findings regarding Visual: 88,89% social activities and 11,11% regarding domestic. Furthermore, the Frequency of occurrence: for male 51,89%. and female 48,11% .Not too many domestic roles and settings found in the book probably because the book is created to inline with Curriculum 2013 where the main purpose of Curriculum 2013 is to develop social skills. It can be concluded that gender representation in this book is dominated by male.


Paleobiology ◽  
1980 ◽  
Vol 6 (02) ◽  
pp. 146-160 ◽  
Author(s):  
William A. Oliver

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.


Author(s):  
D. F. Blake ◽  
L. F. Allard ◽  
D. R. Peacor

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.


Author(s):  
Leon Dmochowski

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.


Author(s):  
J.R. Pfeiffer ◽  
J.C. Seagrave ◽  
C. Wofsy ◽  
J.M. Oliver

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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