A New Method to Calculate Damage Variable with Unload/Load Response Ratio

2014 ◽  
Vol 1065-1069 ◽  
pp. 2040-2043
Author(s):  
Juan Zhang ◽  
Yuan Zhang ◽  
Ke Qiang He ◽  
Wei Gong Chen

As an exploration and extension of load/unload response ratio theory, unload/ load response ratio theory (ULRR for short) is introduced firstly, and the relationship between ULRR (Y′) and elastic modulus (E for short) is obtained. Based on the basic theory of damage mechanics,the relationship between ULRR and damage variable (D for short) is set up and analyzed with the relationship between E and D. The unloading and loading experiments on a two-story structure carried out in the University of Naples in Italy are introduced;and calculated damage variable is compared with that calculated by Zhang Langping who put forward Weibull distribution as random distribution function. The results show that damage variable of the structure keep highly consistent with calculations of these two methods. Therefore, the relationship between Y′and D provides a new approach to a health assessment to catastrophic failure of large-scale structures and prediction of engineering.

2019 ◽  
Vol 9 (19) ◽  
pp. 4124 ◽  
Author(s):  
Xiangchun Li ◽  
Qi Zhang

In order to describe resistivity variation regularities during the process of damage evolution of loading coal mass more comprehensively and accurately, electrical resistivity and acoustic emission (AE) characteristics of coal mass were tested by 3532-50 LCR tester and AMSY-6 AE data acquisition system under the condition of multi-stage loading, and resistivity variation characteristics were analyzed with stress changing. The damage evolution process of coal mass was studied by the measurement of the AE parameters, and the resistivity curve was obtained in the damage conditions based on the relationship between the AE damage variable and the resistivity. The results show that resistivity and stress curves of coal mass have a good correspondence during the multi-stage loading, and the resistivity shows a trend of fluctuating downward with the increasing of stress. The resistivity increases sharply to the maximum value when the load increases to the ultimate compressive strength of specimens. AE information can reveal effectively damage evolution process of microcracks formation, expansion and fracture in coal mass under external force, and during multi-stage loading, the cumulative AE ringing counts curve of coal mass have three different types of growth trends: stable stage, sudden change stage, gradual increasing stage. Meanwhile, the relationship between resistivity and AE damage variable is established based on the formula of damage variable under uniaxial compression and combined with continuous damage mechanics, and its rationality is verified.


1997 ◽  
Vol 22 (1) ◽  
pp. 24-28
Author(s):  
Karen Latimer

The Queen’s University of Belfast set-up a fee based service in 1991 aimed initially at built environment professionals. The Architecture and Planning Information Service at the University has long been a major source of architectural and environmental information in Ireland, and has close links with the Architectural Library at University College Dublin and with professional bodies such as the Royal Society of Ulster Architects and the Royal Town Planning Institute in Northern Ireland. Problems encountered include the relationship and balance of services to internal and external (fee-paying) users, staff training, setting realistic prices, quality control, and contract issues. Future trends are likely to include the development of client-tailored services and further collaboration between providers of fee-based services from different institutions.


1947 ◽  
Vol 13 (2) ◽  
pp. 97-109 ◽  
Author(s):  
J. Charles Kelley

The importance of the Clear Fork Focus as a pre-pottery archaeological complex of north-central Texas has become generally known to archaeologists through the industry of its discoverer and principal proponent, Dr. Cyrus N. Ray, of Abilene, Texas. Unfortunately, the relationship of this complex to other and comparable archaeological cultures of Texas has been largely neglected and some regrettable misinformation in regard to its chronological position has been widely disseminated. In this paper the cultural affiliations and age of the Clear Fork Focus will be discussed in terms of the evidence presented by its discoverers and from the standpoint of new data derived from large scale excavations completed by the University of Texas in the terraces of the Colorado River near Austin, Texas. Additional information obtained by the writer through study of some twelve thousand projectile points from central, south, and western Texas, and their geographic and temporal distribution also is used.


The main aim of the paper is the comparison of two archaeological sites, (1) the Eufaula site of McIntosh County, and (2) the Spiro site of Leflore County, Okla. Purpose of the comparison is to indicate the relationship between the 2 sites, thereby establishing a Spiro Focus, the ramifications and general affiliations of which will be suggested. The thesis is based on original research coming out of my experience as Project Superintendent of various units of the Oklahoma WP A Project. The Project, sponsored by the university of Oklahoma and directed by Dr. F.E. Clements, has carried on large scale excavations in Oklahoma since 1936. At that time the Spiro l\found group, in the east central part of the state, was opened up. In the two years from 1936 to 1938 a crew of 70 WP A laborers, under the direction of trained archaeologists, unearthed quantities of archeological material. The main bulk of material from the "Great Temple" Mound was excavated under the direction of Mr. Joe Finkelstein. 1 It was my privilege to analyze the material excavated by him. I also excavated the Spiro Village and a series of villages in the vicinity of the Mound group. 2 Both groups of data will be utilized.


2020 ◽  
Vol 13 (1) ◽  
pp. 484-488
Author(s):  
Fatemeh R. Jeddi ◽  
Faeze Ghaffary ◽  
Razieh Farrahi

Introduction and Objective: Communication skills are the ability to communicate effectively and efficiently with others, which plays a role in people's intellectual and psychological health; therefore, this study was conducted to investigate the relationship between communication skills and intellectual health in senior students of Paramedicine School at Kashan University of Medical Sciences. Methods: The present study is descriptive-analytical, which was performed cross-sectionally in 2019 on 95 senior students of the Paramedicine School of Kashan University of Medical Sciences. The census method was used in this study due to the limitations of the statistical population. The data collection tool consisted of three parts: Participants' demographic profile, Barton's standard communication skills questionnaire (1990), and intellectual health questionnaire based on the intellectual health scale of entrepreneurs' personality traits assessment questionnaire. The questionnaire was presented to the students in person. After collecting data, it was entered into SPSS 22 software and analyzed with descriptive indices (mean and standard deviation) and analytical statistics (Pearson's correlation and t-test). Results: The total mean score of the communication skills in students was 59.61±5.82. There was a direct and significant relationship between verbal and listening skills (r = 0.32, p = 0.003), verbal and feedback skills (r = 0.43, p = 0.001), listening and feedback skills (r = 0.41, p = 0.001). The mean mental health of the participants in the study was 33.45±5.02 There was a positive correlation between communication skills and intellectual health in students (r = 0.2, p = .07). Conclusion: Communication skills affect intellectual health. Therefore, it is recommended that educational workshops on communication skills and how to communicate be held for students at the beginning and during the study, and that psychological counseling centers be set up or become more active in the university.


2011 ◽  
Vol 199-200 ◽  
pp. 25-31
Author(s):  
Fei Jiang He ◽  
Qiang Zhang ◽  
Zong Xi Cai

In order to determine the loads acting on the cutterhead of a compound shield, this paper aims at the large-scale and fully coupled system of the excavation face. Firstly, a new model is proposed to calculate the loads acting on a single cutter, in which the earth pressure of the chamber is taken into consideration. Then, by transforming the large-scale nonlinear contact problem into a smaller one, we set up the governing equations only including the penetration depth of cutters in the approach of the sub-structure condensation, to calculate the loads acting on the cutterhead. Finally, the relationship between the penetration per revolution and the total thrust and total torque acting on the cutters of the cutterhead of a compound shield is investigated.


2021 ◽  
Vol 1 (2) ◽  
pp. 81
Author(s):  
Ardi Kho ◽  
Elisabeth Dewi Rumanti ◽  
Niko Sudibjo ◽  
Kezia Arya Nanda

<p>The competency standards of university graduates must comply with the National Standards of Education, the Indonesian National Qualification Framework (KKNI), and other criteria set by the university. Universities need to set strategies and implementations to achieve the standard of graduate competence consisting of attitudes, knowledge, and skills stated in the formulation of graduate learning achievements. A case study using a qualitative approach was conducted at the university in Banten, Indonesia. The purpose of this study is to explore academic strategies in university. This includes examining the key drivers for strategic planning, the opportunities pursued in strategic planning, and challenges encountered in the process of strategic planning. The findings suggest that key drivers for strategic planning in the university include market competition and customer requirements. Secondly, the findings are the university should pursue three major strategic planning opportunities, including improved academic operational efficiency, improved student competency, and lecturer’s qualification, as well as improved services of the university. Thirdly, the change management process is reactive and not necessarily transformational in its degree, even though it can involve large-scale changes. The findings integrated into a model contribute to understanding the relationship between the context of strategic planning, the content of strategic planning, and the process of strategic planning in university.</p>


Exchange ◽  
2007 ◽  
Vol 36 (4) ◽  
pp. 359-385 ◽  
Author(s):  
Jo Tollebeek ◽  
Ruben Mantels

AbstractThis article discusses the relationship between the Catholic University of Leuven and the missionary congregations during the period when they were involved in the Belgian colony of the Congo. Their relationship was successful and longstanding, thanks to local networks and interaction between the two institutions, as well as to their shared values and complementary strengths. The forms of cooperation in which they engaged ranged widely, from setting up student missionary movements and teaching programmes for missionaries to providing agricultural and medical university support at the mission stations; and from studying the colonial language experience of the missionary to large-scale cooperation as was the case with Lovanium. These examples indicate that the partnership was active both in Leuven and in the Congo. The missionary archives, however, reveal that the colonial reality could differ from the image that was created in official language and propaganda. From 1955 onwards, as the movement for independence was gaining strength, the process of decolonization set in and the cooperation collapsed.


Author(s):  
Federica Bressan

Sound recordings have proven to be irreplaceable primary sources for disciplines like linguistics, musicology, ethnomusicology and sociology. Their fragile physical nature has activated a number of counter-actions aimed at prolonging the life expectancy of their content. Methodological issues have been raised in the past three decades, considering the relationship between the physical object and its (digitized) intangible content, which is not only complex but develops over time. This article re ects on the role of the emerging discipline known as ‘digital philology’ in the long- term preservation of audio documents, pointing out how some concepts (such as authenticity, reliability and accuracy) may require a ‘customized’ (as opposed to a ‘ready-made’) approach in the preservation work ow – mainly depending on the type of the archive: unique copies, eld recordings, electronic music, oral history, to name some representative cases. The set-up of the laboratory for sound preservation at the Centro di Sonologia Computazionale (CSC) of the University of Padova, Italy, represents one customized approach in which conscious methodological decisions support philologically informed digitization e orts. The methods affect the results, and ultimately the consequences are not merely technological but cultural.


1987 ◽  
Vol 32 (9) ◽  
pp. 768-772 ◽  
Author(s):  
H.C. Stancer ◽  
C. Mellor ◽  
L.R. Weitkamp ◽  
T. Jorna ◽  
C. Flood ◽  
...  

This report constitutes the Newfoundland component of a large scale replication study to assess the relationship of HLA to affective disorders; the Ontario component will be published subsequently. In a collaborative study between the University of Toronto, Memorial University and the University of Rochester, first degree family members of Probands with major affective disorder in Newfoundland were assessed for the lifetime presence of psychiatric disorder; their blood was also typed for Human Leucocyte Antigens (HLA). Because of the high rate of refusal to participate, only 10 Newfoundland families could be assessed completely. While this number of families is too small to evaluate the role of HLA as a marker of susceptibility to affective disorder, the results will be added to those of the larger Ontario component. Some problems of conducting research in communities similar to those found in Newfoundland are briefly discussed in the context of characteristics of the Probands in the study group as compared with those of subjects who refused entry into the study.


Sign in / Sign up

Export Citation Format

Share Document