Residual Torsional Strength of Cracked Stiffened Girders With a Large Deck Opening

2016 ◽  
Author(s):  
Lei Ao ◽  
Deyu Wang
Keyword(s):  
Ultimate Strength ◽  
Mesh Refinement ◽  
The Other ◽  
Initial Deflection ◽  
Failure Zone ◽  
Box Girders ◽  
Geometric Properties ◽  
Torsional Strength ◽  
New Concepts ◽  
Potential Parameters

This paper studies the residual torsional strength of stiffened girders with large deck openings by using the software ABAQUS. The influence of cracks is considered. Potential parameters which may have effects on the torsional strength including the mesh refinement, initial deflection, geometric properties of crack are discussed. Two new concepts that play significant roles in the ultimate strength research of damaged box girders are introduced, one of which is the effective residual section (ERS), the other is the initial damage of the failure zone (IDFZ) for intact structures. New simple formulas for predicting the residual ultimate torsional strength of cracked stiffened girders are derived on the basis of the two new concepts. The formulas are verified to be reasonable which can be used as an reference.

Action-Minimizing Curves for Tonelli Lagrangians

2017 ◽  
Author(s):  
Alfonso Sorrentino
Keyword(s):  
Critical Value ◽  
The Other ◽  
Invariant Sets ◽  
Simple Pendulum ◽  
New Concepts ◽  
Peierls Barrier ◽  
Average Action

This chapter discusses the notion of action-minimizing orbits. In particular, it defines the other two families of invariant sets, the so-called Aubry and Mañé sets. It explains their main dynamical and symplectic properties, comparing them with the results obtained in the preceding chapter for the Mather sets. The relation between these new invariant sets and the Mather sets is described. As a by-product, the chapter introduces the Mañé's potential, Peierls' barrier, and Mañé's critical value. It discusses their properties thoroughly. In particular, it highlights how this critical value is related to the minimal average action and describes these new concepts in the case of the simple pendulum.

scholarly journals Validation as the Integral Part of a Knowledge Management Process

10.28945/2399 ◽  
2001 ◽  
Author(s):  
Maria A. Mach ◽  
Mieczyslaw L. Owoc
Keyword(s):  
Information Technology ◽  
Knowledge Management ◽  
Interdisciplinary Approach ◽  
The Other ◽  
Management Process ◽  
Theoretical Concepts ◽  
Whole Process ◽  
New Concepts ◽  
Organisational Knowledge ◽  
Knowledge Validation

Observing new concepts in information technology, we pay attention to its impact on more effective supporting human and organisational knowledge. Knowledge management (KM) is one of such promising and intriguing concepts. Its goals and infrastructures are defined in different ways, therefore interdisciplinary approach seems to be useful. We have presented a short survey of theoretical concepts in management, marketing and decision theory, which were adapted by the theory of KM. On the other hand, knowledge validation (KV), defined as two procedures: verification and evaluation any form of knowledge, is aimed on assuring its quality. The paper discusses the crucial interrelationships between knowledge validation and management. The main goal of this work is positioning KV activities in the context of knowledge management process, emphasising usability of KV techniques during the whole process.

Decay Estimates (Theorems M4, M5)

2020 ◽  
pp. 295-371
Author(s):  
Sergiu Klainerman ◽  
Jérémie Szeftel
Keyword(s):  
The Other ◽  
Decay Estimates ◽  
Geometric Properties ◽  
Detailed Proof

This chapter evaluates the proof for Theorems M4 and M5. It relies on the decay of q, α‎ and α‎ to prove the decay estimates for all the other quantities. More precisely, the chapter relies on the results of Theorems M1, M2, and M3 to prove Theorems M4 and M5. The detailed proof of Theorem M4 provides the main decay estimates in (ext)M. The proof depends in a fundamental way on the geometric properties of the GCM hypersurface Σ‎∗, the spacelike future boundary of (ext)M introduced in section 3.1.2. The chapter then reformulates the main bootstrap assumptions in the form needed in the proof of Theorem M4.

Stochastic Theory of Human Slipping

2002 ◽  
Author(s):  
Ralph L. Barnett ◽  
Susanne A. Glowiak ◽  
Peter J. Poczynok
Keyword(s):  
Friction Coefficient ◽  
Duty Cycle ◽  
Stochastic Theory ◽  
The Other ◽  
Extreme Value Statistics ◽  
Conventional Theory ◽  
Low Friction ◽  
Friction Coefficients ◽  
Duty Cycles ◽  
New Concepts

The conventional approach to human slipping is essentially deterministic; it states that no slipping will occur when the average friction coefficient is greater than some critical friction criterion. Under this condition, pedestrians will not slip when they encounter the average friction coefficient. On the other hand, to successfully negotiate a walk of n-steps they must not slip when they encounter the smallest of the n friction coefficients. Consequently, a new slip theory has been formulated as a problem in extreme value statistics. An elegant relationship is obtained among the probability of slipping, the critical friction criterion, the number of steps taken by the walker, and the central measure, scatter, and asymmetry of the distribution of friction coefficients. The new theory reveals the structure of human slipping in a startling way that introduces completely new concepts: the go/no go nature of classical slip predictions is replaced by a probability of slipping; low friction floor/footwear couples may lead to fewer slips than high friction ones; slipping can occur in any case where conventional theory predicts “no slip”; and the number of slips depends on the distance traveled by a pedestrian. Finally, this paper develops the idea that the slipperiness of a real floor must be evaluated for a duty-cycle. Duty-cycles can be represented as frequency histograms when a floor is homogeneous and isotropic.

Approximate equivalence of group actions

2017 ◽  
Vol 38 (4) ◽  
pp. 1201-1237 ◽  
Author(s):  
ANDREAS NÆS AASERUD ◽  
SORIN POPA
Keyword(s):  
Group Actions ◽  
The Other ◽  
Equivalence Relations ◽  
Orbit Equivalence ◽  
Usual Type ◽  
New Concepts ◽  
Probability Spaces ◽  
Measure Preserving Actions

We consider several weaker versions of the notion of conjugacy and orbit equivalence of measure preserving actions of countable groups on probability spaces, involving equivalence of the ultrapower actions and asymptotic intertwining conditions. We compare them with the other existing equivalence relations between group actions, and study the usual type of rigidity questions around these new concepts (superrigidity, calculation of invariants, etc).

Development of a Family Vocational Guidance Potential as a Core Prerequisite to Successful Professional Self-Determination of Teenagers

10.12737/3080 ◽  
2014 ◽  
Vol 2 (1) ◽  
pp. 55-61
Author(s):  
Зеленкина ◽  
Tatyana Zelenkina
Keyword(s):  
Professional Education ◽  
Vocational Guidance ◽  
The Other ◽  
Self Determination ◽  
Vocational Choice ◽  
Pilot Testing ◽  
Other Hand ◽  
New Concepts ◽  
Professional Self

Optimized way to nurture parents’ readiness to guide vocational choice of their teenaged children is considered as a consistent element of vocational guidance potential and is scientifically proved. What makes the paper theoretically important, is the fact that the author clarifies the meaning for quite new concepts, as «family vocational guidance potential», «parents’ helpfulness», «successful vocational choice». Families are classified in terms of vocational guidance potential; several limitations in vocational choices of children in each category of families are outlined and illustrated by pictures and tables. Given the accented challenge of insufficient parents’ integration in vocational choices, made by their children, the idea of pilot testing described here, has been to use capabilities of additional professional education establishments to better preparing parents to the mission of facilitating the vocational choices of their children. As a result of parents-children cooperation, the parents are better prepared and eager to help their children in professional self-determination on one hand, while teenagers make more thoughtful vocational choices, on the other hand. Significant results and conclusions are provided, to prove reliability of researching hypothesis, put forward by the author.

Formulations about Dynamics of Mobile Robots

2010 ◽  
Vol 166-167 ◽  
pp. 309-314 ◽  
Author(s):  
Iuliu Negrean ◽  
Claudiu Schonstein ◽  
Kalman Kacso ◽  
Calin Negrean ◽  
Adina Duca
Keyword(s):  
Kinetic Energy ◽  
Mobile Robot ◽  
Mobile Robots ◽  
Dynamic Control ◽  
Nonholonomic Constraints ◽  
The Other ◽  
Robot Motion ◽  
Mobile Platforms ◽  
Control Functions ◽  
New Concepts

In this paper the dynamics equations for a mobile robot, named PatrolBot, will be developed, using new concepts in advanced mechanics, based on important scientific researches of the main author, concerning the kinetic energy. In keeping the fact that the mathematical models of the mobile platforms are different besides the other robots types, due to nonholonomic constraints, these dynamic control functions, will be computed, according to these restrictions for robot motion.

Pan-Americanism and Imperialism

1938 ◽  
Vol 32 (2) ◽  
pp. 233-243 ◽  
Author(s):  
Joseph Lockey
Keyword(s):  
The Other ◽  
Formal Definition ◽  
Precise Meaning ◽  
New Concepts ◽  
Current Usage ◽  
The One ◽  
Pan Americanism ◽  
Made In

Pan-Americanism and imperialism appear to be mutually exclusive. Whether they are so in effect is a matter of definition. Neither term in current usage conveys a precise meaning. Pan-Americanism fails because it has not yet emerged into a distinct and easily recognizable form, and imperialism because it has evolved in the course of history through a variety of forms from which a doubtful choice must be made. In the one case the problem is to decide what meaning, and in the other, which meaning. The "what" is the more difficult to determine, since new concepts such as Pan Americanism acquire meaning with time and circumstance. It is not strange, therefore, that the attempts at formal definition have thus far proved unsatisfactory. Not even the genus to which Pan-Americanism belongs has been agreed upon. One author calls it an advocacy, another an idea, another a sentiment, and sti l others an aspiration, a tendency, or a doctrine. Obviously it does not fall indifferently into all these categories. If it is a sentiment merely, it is less than a doctrine; if it is a doctrine it is more than a tendency; and to call it a tendency is not the same as to say it is an aspiration or an idea. Moreover, none of these classifications when considered separately seems to fit the case.

Ultimate Strength Analysis of Ship Hull Girder Under Random Material and Geometric Properties

2011 ◽  
Vol 133 (3) ◽  
Author(s):  
Suhas Vhanmane ◽  
Baidurya Bhattacharya
Keyword(s):  
Yield Strength ◽  
Ultimate Strength ◽  
Initial Imperfection ◽  
Statistical Dependence ◽  
Strength Analysis ◽  
Bulk Carrier ◽  
Geometric Properties ◽  
Hull Girder ◽  
Initial Imperfections ◽  
Different Levels

The ultimate strength of a ship’s hull depends on its material and geometric properties, some or all of which may be random in nature. In addition, initial imperfections in the form of initial deflection and residual welding stresses in plating between stiffeners can significantly affect the hull ultimate strength. In this paper, the effect of randomness in yield strength and in the initial imperfections on ultimate hull girder strength is determined. Different levels of statistical dependence between yield strength and initial imperfection of stiffeners and plating between stiffeners have been considered. The methodology is applied on a bulk carrier and a VLCC tanker.

Sign in / Sign up

Export Citation Format

Share Document