scholarly journals Frequency spectrum and fatigue analysis of T-bolt fracture in DT III fastener based on Refined Model

2020 ◽  
Vol 103 (3) ◽  
pp. 003685042095013
Author(s):  
Xiao Hong ◽  
Wang Jiaqi ◽  
Zhang Moyan ◽  
Liu Guangpeng ◽  
Mahantesh M. Nadakatti
Keyword(s):  
Frequency Spectrum ◽  
Field Studies ◽  
Critical Issue ◽  
Point Of View ◽  
Contact Theory ◽  
Critical Area ◽  
Refined Model ◽  
Railway Operations ◽  
Nonlinear Contact ◽  
Actual Size

It is observed that T-bolt fracture of DT III fastener affects the safety of railway operations. The present study is aimed at finding solution to this critical issue of DT III T-bolt fracture. The paper is based on outcomes of field studies and analysis of relationship between bolt installation torque and stress. A refined DT III fastener model is established based on test data and nonlinear contact theory as per the actual size of each component. It is being observed that head-shank joint is a critical area during service. With respect to fatigue and stress, when the installation torque is less than 300 KN-mm, the bolt is prevented from yielding during installation. To a certain extent it also improves the fatigue life of bolt. From the frequency spectrum point of view, the vibration sensitive frequency band (1050–1100 Hz, 1230–1270 Hz) of bolt in service is very close to the main frequency of bolt vibration (1200 Hz). It may cause bolt fracture. In order to avoid resonance, the train operational speed should be strictly controlled between 115 km/h and 120 km/h.

Structural design of an over-track building with mid-story isolation

2021 ◽  
Author(s):  
Daiki Nakamizo ◽  
Seiya Kimura ◽  
Yuichi Koitabashi
Keyword(s):  
Urban Space ◽  
Structural Design ◽  
Point Of View ◽  
Transit Oriented Development ◽  
Structural Element ◽  
Basement Structure ◽  
Design Point ◽  
High Rise ◽  
Railway Operations ◽  
In Transit

<p>In order to use urban space effectively in Transit-Oriented Development (TOD), over-track buildings (built over railways), are becoming increasingly popular in Japan. From a construction and structural design point of view, the basement structure just beneath railways generally cannot be built while railway operations continue (interruption to operations is not permitted, In general).</p><p>This paper presents the structural design of a mid-story isolated high-rise building constructed over railways in Ikebukuro, Tokyo. The paper shows, not only the philosophy of the system, but also the structural design, full-scale experiments, and evaluation of the performance in each structural element. The authors believe that such a structural design will be one of the effective solutions to the over-track building.</p>

scholarly journals Contact mechanics for soft robotic fingers: modeling and experimentation

Robotica ◽  
2012 ◽  
Vol 31 (4) ◽  
pp. 599-609 ◽  
Author(s):  
Sadeq H. Bakhy ◽  
Shaker S. Hassan ◽  
Somer M. Nacy ◽  
K. Dermitzakis ◽  
Alejandro Hernandez Arieta
Keyword(s):  
New York ◽  
Contact Mechanics ◽  
Weighted Least Squares ◽  
Theory Of Elasticity ◽  
Contact Theory ◽  
Nonlinear Contact ◽  
Different Types ◽  
Least Squares Curve Fitting ◽  
Almost All ◽  
Power Law Equation

SUMMARYHuman fingers possess mechanical characteristics, which enable them to manipulate objects. In robotics, the study of soft fingertip materials for manipulation has been going on for a while; however, almost all previous researches have been carried on hemispherical shapes whereas this study concentrates on the use of hemicylindrical shapes. These shapes were found to be more resistant to elastic deformations for the same materials. The purpose of this work is to generate a modified nonlinear contact-mechanics theory for modeling soft fingertips, which is proposed as a power-law equation. The contact area of a hemicylindrical soft fingertip is proportional to the normal force raised to the power of γcy, which ranges from 0 to 1/2. Subsuming the Timoshenko and Goodier (S. P. Timoshenko and J. N. Goodier, Theory of Elasticity, 3rd ed. (McGraw-Hill, New York, 1970) pp. 414–420) linear contact theory for cylinders confirms the proposed power equation. We applied a weighted least-squares curve fitting to analyze the experimental data for different types of silicone (RTV 23, RTV 1701, and RTV 240). Our experimental results supported the proposed theoretical prediction. Results for human fingers and hemispherical soft fingers were also compared.

ELHISA: An architecture for the integration of heterogeneous lexical information

2008 ◽  
Vol 14 (2) ◽  
pp. 253-281
Author(s):  
XABIER ARTOLA ◽  
AITOR SOROA
Keyword(s):  
Conceptual Model ◽  
Language Processing ◽  
Information Integration ◽  
Large Scale ◽  
Query Language ◽  
Critical Issue ◽  
Object Identification ◽  
Point Of View ◽  
Lexical Resources ◽  
Lexical Information

AbstractThe design and construction of lexical resources is a critical issue in Natural Language Processing (NLP). Real-world NLP systems need large-scale lexica, which provide rich information about words and word senses at all levels: morphologic, syntactic, lexical semantics, etc., but the construction of lexical resources is a difficult and costly task. The last decade has been highly influenced by the notion of reusability, that is, the use of the information of existing lexical resources in constructing new ones. It is unrealistic, however, to expect that the great variety of available lexical information resources could be converted into a single and standard representation schema in the near future. The purpose of this article is to present the ELHISA system, a software architecture for the integration of heterogeneous lexical information. We address, from the point of view of the information integration area, the problem of querying very different existing lexical information sources using a unique and common query language. The integration in ELHISA is performed in a logical way, so that the lexical resources do not suffer any modification when integrating them into the system. ELHISA is primarily defined as a consultation system for accessing structured lexical information, and therefore it does not have the capability to modify or update the underlying information. For this purpose, a General Conceptual Model (GCM) for describing diverse lexical data has been conceived. The GCM establishes a fixed vocabulary describing objects in the lexical information domain, their attributes, and the relationships among them. To integrate the lexical resources into the federation, a Source Conceptual Model (SCM) is built on the top of each one, which represents the lexical objects concurring in each particular source. To answer the user queries, ELHISA must access the integrated resources, and, hence, it must translate the query expressed in GCM terms into queries formulated in terms of the SCM of each source. The relation between the GCM and the SCMs is explicitly described by means of mapping rules called Content Description Rules. Data integration at the extensional level is achieved by means of the data cleansing process, needed if we want to compare the data arriving from different sources. In this process, the object identification step is carried out. Based on this architecture, a prototype named ELHISA has been built, and five resources covering a broad scope have been integrated into it so far for testing purposes. The fact that such heterogeneous resources have been integrated with ease into the system shows, in the opinion of the authors, the suitability of the approach taken.

Research on the Transformation of Ba-Construction in Patent Machine Translation

2014 ◽  
Vol 513-517 ◽  
pp. 4601-4604
Author(s):  
Wen Fei Chang ◽  
Zhi Ying Liu ◽  
Yao Hong Jin ◽  
Lin Nan Bai ◽  
Hui Ying Yan
Keyword(s):  
Machine Translation ◽  
Critical Issue ◽  
Point Of View ◽  
Utilization Rate ◽  
Translation System ◽  
Ba Construction ◽  
Machine Translation System ◽  
Semantic Point ◽  
Concept Theory ◽  
Action Sentence

Ba-construction is a special structure in Chinese, it has a high utilization rate in patent documents and there is no corresponding sentence in English. Therefore, Ba-construction is a critical issue in machine translation. In this paper, based on the Hierarchical Network of Concept theory (HNC theory), we have an analysis of the Ba-construction in action sentence (XJ) and transfer sentence (TJ), and then conclude 4 main verbs translation formats from the semantic point of view according to corpus. The research results have been applied to our machine translation system and it has improved the correct rate of translation effectively.

scholarly journals REFLEXÕES SOBRE A ESTRATÉGIA DO OCEANO AZUL: UMA COMPARAÇÃO COM AS ESTRATÉGIAS DE ANSOFF, PORTER E HAX & WILDE DOI:10.7444/fsrj.v2i2.51

2010 ◽  
Vol 2 (2) ◽  
pp. 17-37
Author(s):  
Ailton Conde Jussani ◽  
Patricia Viveiros de Castro Krakauer ◽  
Edison Fernandes Polo
Keyword(s):  
Field Studies ◽  
Critical Issue ◽  
Strategic Decision ◽  
Review Of The Literature ◽  
Strategic Decisions ◽  
Strategy Formation ◽  
Business Environments ◽  
Generic Strategies ◽  
Porter's Generic Strategies ◽  
Delta Model

Within the context of the globalized environment, competitiveness has become a critical issue for business. The use of research to inform strategic decisions is thus important for firms on the path to competitiveness, regardless of their market of operation. This paper provides an overview of four strategies—Kim and Mauborgne’s Blue Ocean Strategy, Ansoff’s Matrix, Porter’s Generic Strategies, and Hax and Wilde’s Delta model—in order to find the similarities and approximations among them. Applying the scientific reading method, we conducted a comprehensive review of the literature on strategy to draw up a comparative matrix among the four strategies analyzed so as to discuss the typologies for strategy formation modes. This matrix is intended to be used in future field studies. The comparison led to the observation that several possible approaches exist, each suited for distinctive businesses and business environments. This article aims to contribute to a better knowledge of administrative techniques that can help firms - and their executives - improve strategic decision making by choosing the strategy that best fits the competitive environment in which their business operates. Key-words: Strategic decisions. Strategic approaches. Comparative matrix. 

scholarly journals Christ’s Supremacy: Colossians 1:15-20 and Its Implication in Education

2019 ◽  
Vol 1 (1) ◽  
pp. 1
Author(s):  
Chandra Han
Keyword(s):  
Christian Education ◽  
Critical Issue ◽  
Point Of View ◽  
Christian Faith ◽  
Greek Text

<p class="abstracttextDILIGENTIA"><span lang="EN-ID">Supremacy of Christ in Col. 1:15-20 is essential to Christian faith. Many attempts have been made to examine this passage and mostly from the theological point of view. The aim of this article is to reexamine this passage and propose an analysis from the perspective of Christian education (with the implications) by firstly exegeting the passage in Colossian’s context. The exegesis begins with providing the translation form the Greek text, proposing the structure followed by demonstrating the critical issue in each section of the structure, and finally summarizing the principles. The next step is to demonstrate the analysis from the perspective of Christian education on every section in the structure, followed by the significance of this passage in Christian education.</span></p>

scholarly journals Friction Stir Processing on the Tribological, Corrosion, and Erosion Properties of Steel: A Review

2021 ◽  
Vol 5 (3) ◽  
pp. 97
Author(s):  
Alessandro M. Ralls ◽  
Ashish K. Kasar ◽  
Pradeep L. Menezes
Keyword(s):  
Friction Stir Processing ◽  
Current Knowledge ◽  
Cost Effective ◽  
Critical Issue ◽  
Passive Layer ◽  
Point Of View ◽  
Economic Point ◽  
Friction Stir ◽  
Erosion Properties ◽  
Processing Techniques

The eventual material degradation of steel components in bio-implant, marine, and high-temperature applications is a critical issue that can have widespread negative ramifications from a safety and economic point of view. Stemming from their tribological, corrosion, and erosion-based properties, there is an increasing need to address these issues effectively. As one solution, surface processing techniques have been proposed to improve these properties. However, common techniques tend to suffer from issues spanning from their practicality to their high costs and negative environmental impacts. To address these issues, friction-stir-processing (FSP) has been one technique that has been increasingly utilized due to its cost effective, non-polluting nature. By inducing large amounts of strain and plastic deformation, dynamic recrystallization occurs which can largely influence the tribological, corrosion, and erosion properties via surface hardening, grain refinement, and improvement to passive layer formation. This review aims to accumulate the current knowledge of steel FSP and to breakdown the key factors which enable its metallurgical improvement. Having this understanding, a thorough analysis of these processing variables in relation to their tribological, corrosion, and erosion properties is presented. We finally then prospect future directions for this research with suggestions on how this research can continue to expand.

scholarly journals Graiurile poloneze din Poiana Micului şi Bulai (Bucovina de Sud) – o perspectivă sociolingvistică de tip comparativ pe baza ALAB

2020 ◽  
Vol 47 (3) ◽  
pp. 55-78
Author(s):  
Florin-Teodor Olariu ◽  
Veronica Olariu
Keyword(s):  
Ethnic Minority ◽  
Ethnic Groups ◽  
Field Studies ◽  
Point Of View ◽  
Research Projects ◽  
Literary Language ◽  
Polish People ◽  
The Status

The Polish communities from Bukovina have been studied in the last period through several research projects, initiated by both Polish and Romanian researchers. One of them is the Audiovisual Linguistic Atlas of Bukovina (ALAB), which aims to realize a radiography in multimedia format of the ethnolinguistic diversity of Bukovina. Regarding the Polish ethnic minority, in 2016 two field studies have been carried out in two localities: Bulai and Poiana Micului. Following the analysis of the material thus obtained, we managed to capture some characteristics both at the linguistic and the sociolinguistic level that individualize the two communities. Thus, from a linguistic point of view, the two dialects are different both at phonetic and lexical level, the Bulai dialect being more similar to the Polish literary language. At the sociolinguistic level has been observed the presence of a strong epilinguistic component in the Polish people speech, based on the representations and the attitudes that the Polish ethnic groups have regarding the status and the vitality of their own dialects.

scholarly journals Geo-Environmental investigation of Sahure pyramid complex, Abusir Archeological site, Giza, Egypt

2021 ◽  
Author(s):  
Abdelrhman Muhamed Fahmy Sayed Ahmed ◽  
Fatma Muhamed Helmy
Keyword(s):  
Building Materials ◽  
Construction Materials ◽  
Polarized Light ◽  
Archaeological Site ◽  
Field Studies ◽  
Point Of View ◽  
Western Side ◽  
The Impact ◽  
Archeological Site ◽  
Engineering Stability

Abstract Abusir is the name of an elaborate burial area, dotted with 19 pyramids other temples, stretching on the western side of the Nile from the south of the Giza Plateau to the northern rim of Saqqara. It seems to have been created as the resting site for the Pharaos dated from 2494 to 2345 BC. The name Abusir, originally spoken as Busiri, means” temple of Osiris”. Over time, the name has become so popular, that more than 60 villages now carry this name. But only one is the archaeological site. This paper does not refer to all of the Abusir archaeological area, but focuses one of its most important sites: Sahure pyramid, one of Egypt’s little known, but heavily damaged treasure. One of the highlights of the relevant research is the discovery of a piece of cement (Basaltic mortar/concrete), which consists of several materials and which is harder than any cement produced today and detection of a clear and significant Anorthite mineral (Plagioclase) in the mortar sample which had been proven by XRD, XRF (analysis) and Polarized light microscope (investigation). The main objectives of this paper are 1) to reveal and identify the construction materials of the pyramid and the construction of the pyramid,2) to evaluate the durability and vulnerability of the Ancient construction materials of Sahure pyramid,3) to compare the decayed patterns of the different construction materials, 4) to study the pyramid building materials from geological, meteorological, geochemical, petrological and petrophysical point of view, and 5) to present a proposal for scientific conservation and protection of the pyramid. Laboratories and field studies have been carried out by researchers from various countries to investigate and understand the problems of the pyramid leading to the final results which confirmed the impact of the geo environment conditions on the structural and engineering stability of the pyramid.

scholarly journals Environmental management of protected objects of the Eastern Podillya: Theory and practice

2019 ◽  
Vol 9 (4) ◽  
pp. 732-737
Author(s):  
O. V. Mudrak ◽  
G. F. Mazur ◽  
K. H. Herasymiuk ◽  
H. V. Mudrak ◽  
H. S. Tarasenko
Keyword(s):  
Environmental Management ◽  
Nature Reserve ◽  
Field Studies ◽  
Point Of View ◽  
Theory And Practice ◽  
Quantitative Composition ◽  
Natural Zones ◽  
The Matrix ◽  
The Creation ◽  
Selection Of

The article deals with environmental management of the objects and territories of the Eastern Podillya Nature Reserve in the structure of the regional ecological network from the standpoint of physical and geographical zoning. A system of approaches and principles is proposed, which should be used when forming a network of protected objects. The main criterion for the selection of these objects should be the principle of representativeness, while it is advisable to take into account their three types - biotic (botanical; zoological; mycological); geographical (landscape; biogeographic); geosozological (objective; categorical; functional). The area, its size, configuration, state of internal ecological equilibrium, he qualitative and quantitative composition of the protected objects, the degree of anthropogenic impact and the types of conservation regimes play an important role in the creation of the protected objects. But also, of great importance in forming a network of protected objects is the matrix representation, which is widely used in EU countries. The basis is the landscape-zonal principle, where the matrix of biodiversity and landscapes are systems of units of natural areas (biogeographical, geobotanical, floristic, zoogeographic, physical and geographical). According to this principle, the creation of protected objects must be represented by typical (indicator) species of biodiversity, landscapes of all natural zones, subzones, regions, provinces, sub-provinces, districts. On-site surveys of the Eastern Podillya have found that a large proportion of protected sites do not fulfill the function of biodiversity and landscape diversity. The conducted field studies have shown that in the present ecological conditions of the region there is a risk of loss of this diversity. Therefore, using the principle of representativeness, we propose to optimize the nature reserve fund of Eastern Podillya from the point of view of physical and geographical zoning.

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