scholarly journals Curves and surfaces in the context of optometry. Part 1: Curves*

2005 ◽  
Vol 64 (4) ◽  
Author(s):  
W.F. Harris

This paper introduces the differential geom-etry of curves in Euclidean 3-space, the motiva-tion being the writer’s belief that, despite their fundamental importance, curves are inadequate-ly treated in optometric educational programs. Curvature and torsion are defined along a curve. Two  numerical  examples  are  presented.  The fundamental theorem of curves is stated. The relationship of the geometry of varifocal lenses and curves known as involutes are discussed. A brief treatment of the theory of contact is given with  suggestions  of  applications  in  contact between  spectacle  lenses  and  frames,  contact lenses and corneas (including orthokeratology), intra-ocular lenses and structures in the eye, and spectacle frames and the face.

2020 ◽  
Vol 36 (03) ◽  
pp. 309-316
Author(s):  
Ozcan Cakmak ◽  
Ismet Emrah Emre

AbstractPreservation of the facial nerve is crucial in any type of facial procedure. This is even more important when performing plastic surgery on the face. An intricate knowledge of the course of the facial nerve is a requisite prior to performing facelifts, regardless of the technique used. The complex relationship of the ligaments and the facial nerve may put the nerve at an increased risk of damage, especially if its anatomy is not fully understood. There are several danger zones during dissection where the nerve is more likely to be injured. These include the areas where the nerve branches become more superficial in the dissection plane, and where they traverse between the retaining ligaments of the face. Addressing these ligaments is crucial, as they prevent the transmission of traction during facelifts. Without sufficient release, a satisfying pull on the soft tissues may be limited. Traditional superficial musculoaponeurotic system techniques such as plication or imbrication do not include surgical release of these attachments. Extended facelift techniques include additional dissection to release the retaining ligaments to obtain a more balanced and healthier look. However, these techniques are often the subject of much debate due to the extended dissection that carries a higher risk of nerve complications. In this article we aim to present the relationship of both the nerve and ligaments with an emphasis on the exact location of these structures, both in regard to one another and to their locations within the facial soft tissues, to perform extended techniques safely.


2000 ◽  
Vol 12 (1-4) ◽  
pp. 141-161
Author(s):  
Robert N. Mccauley

AbstractThe aims of this paper are to identify three barriers to the development of cognitive approaches to the study of religion and to suggest how each might be circumvented. The first of these barriers is methodological and lurks amid two issues that, historically, have dominated anthropologists' reflections on the relationship of their discipline to psychology. The older of the two can be characterized as the "psychic unity" controversy (see Shore 1995). The second issue is the controversy over the "autonomy of culture". Advocates of the latter thesis are usually unsympathetic to psychological explanations of religious phenomena. In the first section, I shall begin by briefly examining each of those issues and then exploring the connections between the two as well as interesting logical tensions that arise in the face of popular responses to each. In section two, I shall consider a pair of barriers to a cognitive psychology of religion rooted in two strategies that have dominated many psychologists' approaches to the study of religion. I will argue that for some purposes, at least, both strategies should be relaxed. Finally, in section three, I shall briefly sketch one sort of cognitive approach to religious phenomena, suggesting how it handles the two strategic barriers in particular.


2014 ◽  
Vol 33 ◽  
pp. 65-75
Author(s):  
HK Das ◽  
M Babul Hasan

In this paper, we study the methodology of primal dual solutions in Linear Programming (LP) & Linear Fractional Programming (LFP) problems. A comparative study is also made on different duals of LP & LFP. We then develop an improved decomposition approach for showing the relationship of primal and dual approach of LP & LFP problems by giving algorithm. Numerical examples are given to demonstrate our method. A computer programming code is also developed for showing primal and dual decomposition approach of LP & LFP with proper instructions using AMPL. Finally, we have drawn a conclusion stating the privilege of our method of computation. GANIT J. Bangladesh Math. Soc. Vol. 33 (2013) 65-75 DOI: http://dx.doi.org/10.3329/ganit.v33i0.17660


Author(s):  
David A. deSilva

The books of the Apocrypha contain extensive reflection on the theologies of earlier Jewish writings, particularly in regard to election, the Torah, and the Deuteronomistic theology of history, in the face of several critical situations facing the Jewish people (the advance and advantages of Hellenization, the repression of Judaism under Antiochus IV, ongoing life as a minority culture throughout the Diaspora, and domination and devastation under Rome). They also bear witness to important developments both in personal and national eschatology and in the identification of supernatural forces impacting human existence (e.g., angels and demons). Early Christians, in turn, found these texts to provide important resources for their reflection upon the person and work of Jesus, applying developments within the Wisdom tradition in their delineation of the relationship of the Son to God and within the Jewish martyrological traditions to their professions about the atoning force of Jesus’ death. These texts thus exercised an important influence on the theologies articulated in the New Testament and the development of the doctrines and creeds embraced by the universal church, despite the ongoing discussions within the church concerning their canonical status.


Author(s):  
Dorothy M. Johnston

Thirty-five subjects who did not wear glasses or contact lenses and with foveal acuity of 20/30 or better monocular and binocular far and near vision were given a near-vision peripheral acuity test and a farvision search task. The results, which showed a low correlation between near-vision peripheral acuity and far-vision search performance, are consistent with Giese's findings of low correlations between near and far foveal acuity.


1938 ◽  
Vol 84 (349) ◽  
pp. 284-346 ◽  
Author(s):  
Louis H. Cohen

Of fundamental importance in the problem of symptom-formation in schizophrenia is the question of the relationship of given symptoms to specific aspects of the personality. The present paper bears on this question in that it is concerned with the investigation of the imagery of the schizophrenic, and the relationship of certain symptoms to specific imagery characteristics. More specifically stated, interest here is in the questions of (1) whether or not the imagery of schizophrenics is different from that of normal individuals, and of (2) the relationships of the imagery of schizophrenics to such symptoms as hallucinations, delusions, and activity disturbances. It is believed that these observations may serve the psychiatrist in understanding the nature of the schizophrenic process by its indication of the importance of imagery in schizophrenic symptom-formation.


2017 ◽  
Vol 12 (01) ◽  
Author(s):  
Priya Handa ◽  
Ruhi Lal

The study has explored the rising psychological changes with the media convergence of television and Facebook and significance of a positive approach to deal with hierarchical conduct of employee in any company. The study investigates the brand advertisement showcasing balance of personal and professional life in the relationship of wife and husband at same work place. The study focused on semiotic approach to analyze the advertisement of Airtel India emphasizing on social roles of women in the society and its impact on the users of Facebook. The researcher analyzed the hegemony in the commercial and promotion of advertisement on public platform as face book to know the impact on consumer towards the commercial. Initially television is used as a medium the commercial was also released through Facebook with a strong brand communication strategy. The findings revealed that the observational information shared on Facebook affirms a portion of positive hierarchical conduct, that concentrates on the enticing urge in the consumers / users to aspire, visualize, share the views about the commercial with emotions on the face book page showcasing positive consumer psychology.


1979 ◽  
Vol 38 (3) ◽  
pp. 477-497 ◽  
Author(s):  
Steven E. G. Kemper

AbstractAstrology is a neglected cultural form in the study of South Asian society. It is also one which pays attention to the individual in ways that seem to fly in the face of scholarly understandings of Asian societies as places where individuality has little importance. The ideology of caste, the institution most often taken as an analytical entry to South Asian societies, gathers people into groups on the basis of their gross similarities and fixes a person's condition for life. Astrology treats individuals as distinguished by subtle differences and liable to momentary changes. The paper argues that caste ideology and astrology have a common vocabulary and logic, one which is genealogical and combinatory, and suggests in turn several conclusions about the relationship of individuals and society in South Asian cultures.


PLoS ONE ◽  
2021 ◽  
Vol 16 (5) ◽  
pp. e0251393
Author(s):  
Miriam Biermann ◽  
Anna Schulze ◽  
Franziska Unterseher ◽  
Konstantina Atanasova ◽  
Paulina Watermann ◽  
...  

Background During the Covid-19 pandemic, the negative effects of wearing a mouth-nose cover (MNC) on interpersonal functioning have been discussed in public media but empirical studies on how wearing MNCs affect social judgements are sparse. In the present study, we investigated the effects of MNCs on trustworthiness appraisals, the influence of changes due to MNCs in evaluating joy, and the relationship between a social-cognitive appraisal bias and a participant’s characteristics. Methods All participants (N = 165) judged the intensity of happiness and trustworthiness in calm facial stimuli presented with and without a surgical mask covering part of the face. We analysed the relationship of changes in judgements evoked by MNCs to participants’ evaluations of MNCs as protective tools and explored their associations with the burden experienced by wearing MNCs, compliance to behaviour recommendations, their risk associated with the pandemic, and their levels of psychological distress. Results Overall, calm facial stimuli covered with MNCs were evaluated as less trustworthy and, to an even stronger extent, less happy than uncovered facial stimuli. However, participants varied in whether they showed a negative or positive evaluation of faces with MNCs; the negative bias was stronger in those participants who attributed lower protective potential to MNCs, experienced a higher burden while wearing MNCs, wore MNCs less often, and experienced a higher level of psychological distress. Conclusions A negative bias in trustworthiness appraisals of faces with a positive emotional expression covered by MNCs is linked to a participant’s evaluation of MNCs as inefficient and burdening and their experience of high psychological distress.


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