Composite fuselage technology (summary of year 2)

The overall objective of this work is to identify and understand, via directed experimentation and analysis, the mechanisms which control the structural behavior of fuselages in their response to damage (resistance, tolerance, and arrest). A further objective is to develop straightforward design methodologies which can be employed by structural designers in preliminary design stages to make intelligent choices concerning the material, layup, and structural configuration so that a more efficient structure with structural integrity can be designed and built

Composite fuselage technology

The overall objective is to identify and understand, via directed experimentation and analysis, the mechanisms which control the structural behavior of fuselages in their response to damage (resistance, tolerance, and arrest). A further objective is to develop straightforward design methodologies which can be employed by structural designers in preliminary design stages to make intelligent choices concerning the material, layup, and structural configuration so that a more efficient structure with structural integrity can be designed and built

Damage tolerance and arrest characteristics of pressurized graphite/epoxy tape cylinders

An investigation of the damage tolerance and damage arrest characteristics of internally-pressurized graphite/epoxy tape cylinders with axial notches was conducted. An existing failure prediction methodology, developed and verified for quasi-isotropic graphite/epoxy fabric cylinders, was investigated for applicability to general tape layups. In addition, the effect of external circumferential stiffening bands on the direction of fracture path propagation and possible damage arrest was examined. Quasi-isotropic (90/0/plus or minus 45)s and structurally anisotropic (plus or minus 45/0)s and (plus or minus 45/90)s coupons and cylinders were constructed from AS4/3501-6 graphite/epoxy tape. Notched and unnotched coupons were tested in tension and the data correlated using the equation of Mar and Lin. Cylinders with through-thickness axial slits were pressurized to failure achieving a far-field two-to-one biaxial stress state. Experimental failure pressures of the (90/0/plus or minus 45)s cylinders agreed with predicted values for all cases but the specimen with the smallest slit. However, the failure pressures of the structurally anisotropic cylinders, (plus or minus 45/0)s and (plus or minus 45/90)s, were above the values predicted utilizing the predictive methodology in all cases. Possible factors neglected by the predictive methodology include structural coupling in the laminates and axial loading of the cylindrical specimens. Furthermore, applicability of the predictive methodology depends on the similarity of initial fracture modes in the coupon specimens and the cylinder specimens of the same laminate type. The existence of splitting which may be exacerbated by the axial loading in the cylinders, shows that this condition is not always met. The circumferential stiffeners were generally able to redirect fracture propagation from longitudinal to circumferential. A quantitative assessment for stiffener effectiveness in containing the fracture, based on cylinder radius, slit size, and bending stiffnesses of the laminates, is proposed

Aircraft System Design Graduate Curriculum: A Lifecycle Focus

Aircraft system design encompasses technical, social and lifecycle topics, and is suitable for graduate studies at the masters level and beyond. Several degree programs in MIT’s School of Engineering offer opportunities for students seeking subjects and degrees in this area. These programs are summarized, and one subject on Aircraft Systems Engineering is introduced as an illustration of content and pedagogy addressing lifecycle topics. Based upon several years of experience of participation in these programs and in offering curriculum, the authors put forward seven observations to stimulate further dialog and progress on this topic

A Meta-Analysis of Genome-Wide Association Scans Identifies IL18RAP, PTPN2, TAGAP, and PUS10 As Shared Risk Loci for Crohn's Disease and Celiac Disease

This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited

Finding Guide to the Paula Hirsch Foster Collection DRAFT

DRAFT of the Guide to the Paula Hirsch Foster Collection, as of February 2016

ENGLISH AS AN ADDITIONAL LANGUAGE LEARNERS’ JOURNEY THROUGH NURSING EDUCATION IN CANADA

Nursing students who speak English as an additional language (EAL) face significant challenges throughout their educational programs. This problem is attributed to numerous causes from admission standards, to cultural biases, and more. There is a dearth of studies exploring the perspective of the graduated EAL nurse. This demographic offers a valuable perspective worthy of exploration. This study asks: what can be learned from the lived experiences of recently graduated EAL nurses, looking back on their Canadian undergraduate nursing education programs? Interpretive description methodology was utilized for this study, as its premise is to explore and interpret a human experience and apply findings to practice. Data collection consisted of five participant interviews and relevant public domain records. Findings centered around the impact of EAL nurses’ deep and genuine relationships with peers, patients, and instructors. Implications for practice are how these relationships can inspire and improve pedagogical practices for Canadian nursing education.2022-1

Ardhanārīśvara in Tiruchengode, Tamil Nadu : a case study

There has been a persistent tendency in the study of religion to emphasize its textual and historical elements, at the expense of ritual, practice, and custom. This trend is evident in the available academic works concerning the androgynous Hindu deity, Ardhanārīśvara. Scholarship largely overlooks Ardhanārīśvara in living context, including information about dedicated sites of worship. To attend to this gap, this project explores Ardhanārīśvara in Tiruchengode, Tamil Nadu, as it is home to a hilltop temple wherein Ardhanārīśvara is the presiding deity. An analysis of my fieldwork observations and impressions yields two types of contributions. The first relates to areas of previous scholastic focus; new information is provided on Ardhanārīśvara iconography, mythological narratives, and regarding interpretations of the figure. The second type of contribution involves unexplored content, including information on the aforementioned site of worship and the place of Ardhanārīśvara in ritual within this context. Additionally, the theoretical and methodological underpinnings of this thesis stress understanding observable phenomena as dynamic. This led to astute observations regarding Ardhanārīśvara that also go delineated. These provisions reaffirm the significance of those areas identified as overlooked in the study of religion and provide a more robust treatment of the figure