scholarly journals Forensic Engineering Analysis Of Total Reaction Time

Author(s):  
James M. Green

This Paper Develops A Method For Determining A Meaningful Reaction Time In Accident Reconstruction And Civil Engineering Design. A Method For Total Perception Time (Tpt) Is Explained Using Literature From The Professions Of Psychology, Optometry And Engineering. A Determination Of Total Perception Time (Tpt), Or Total Perception Distance (Tpd), Is Given Where The Engineer Allows Enough Time For The Actual Stimulus To Be Identified Before Determining If Evasive Action Can Be Taken Or Collision Can Be Avoided. The Use Of Tpt Can Be Calculated In Accident Reconstruction And Engineering Design By Using The Actual Environmental Conditions That Were Present At The Site Under Investigation. The Purpose Of Presenting This Analysis Is To Establish A Starting Point For Discussion And Evaluation Of Total Perception Time (Tpt) Or Total Perception Distance (Tpd). The Reaction Time Sequence Affects Every Facet Of Forensic Engineering And Civil Engineering Design. It Is The Writers Intent That A Definition Of This Methodology Can Be Developed In Order That The Engineering Community Will Have A Tool That Is Accepted.

2016 ◽  
Vol 16 (6) ◽  
pp. 98-110
Author(s):  
Gao Xuedong ◽  
Gu Kan

Abstract The traditional time series studies consider the time series as a whole while carrying on the trend detection; therefore not enough attention is paid to the stage characteristic. On the other hand, the piecewise linear fitting type methods for trend detection are lacking consideration of the possibility that the same node belongs to multiple trends. The above two methods are affected by the start position of the sequence. In this paper, the concept of overlapping trend is proposed, and the definition of milestone nodes is given on its base; these way not only the recognition of overlapping trend is realized, but also the negative influence of the starting point of sequence is effectively reduced. The experimental results show that the computational accuracy is not affected by the improved algorithm and the time cost is greatly reduced when dealing with the processing tasks on dynamic growing data sequence.


1996 ◽  
Vol 47 (1) ◽  
pp. 11 ◽  
Author(s):  
DJ Hawke ◽  
KJ Powell ◽  
JE Gregor

An FIA technique with 7 s reaction time was used to analyse free plus labile Al in fulvic acid (FA) solutions and natural waters at pH 4.7, without the need for separation procedures. Titrations of these solutions using incremental pH or total Al were used to determine pH binding curves or estimates of the 'kinetic' Al complexation capacity (Al-CCk) respectively. The operational definition of Al-CCk relates to the capacity of a humic substance or natural water to bind Al through a 7-s FIA reaction time under defined experimental conditions of chromophore (CAS) concentration, ionic strength, and pH. Both Al binding strength and complexation capacity were greater than the corresponding Cu-CC (ISE) values. The Al-CCk measurements at pH 4.7 were 710 μmol Al g-1 v. 590 μmol Cu g-1. Al-CCk results (pH 4.7) were higher for soil FA (710 μmol g-1) than for aquatic FA (390 μmol g-1). Al-CCk results (pH 4.7) for five unfiltered river waters from different catchments gave results in the range 6.5-9.8 μmol Al L-1. The differences between total (natural) Al in the samples and Al-CCk were between 2.7 μM and 8.6 μM. Filtration experiments identified fractionation patterns between total (natural) Al and the fraction of Al-CCk not utilized. The Al titration of alginate, another component of natural organic matter, is reported.


2016 ◽  
Vol 23 (4) ◽  
pp. 145-160 ◽  
Author(s):  
Jacek Sztubecki ◽  
Adam Bujarkiewicz ◽  
Małgorzata Sztubecka

Abstract The application of geodetic methods to examine structures consists in the determination of their displacements relative to an established geodetic reference datum or in the definition of the geometry of their individual components. Such examinations form a picture of changes happening between specific points in time. Modern measurement technologies used in geodetic engineering enable undertaking more and more challenging measurements with increasing accuracy. The purpose of this article is to present a measurement technique involving a Leica TDRA 6000 total station to measure displacements in engineering structures. The station features a direct drive technology to achieve an accuracy of 0.25 mm in 3-dimensional measurements. Supported by appropriate software, the unit makes a perfect instrument for the monitoring of civil engineering structures. The article presents the results of measurement of static and dynamic displacements in a few engineering structures. The measurements were carried out both in laboratory conditions and on actual, operated civil engineering structures.


2021 ◽  
Vol 2 (5) ◽  
pp. 1-4
Author(s):  
A. A. Umbugadu ◽  
M. I. Ancho ◽  
Nghargbu K’tso

Swell potential of soils from parts of Panyam, North – Central Nigeria were investigated covering 72 square kilometres within latitudes N9021′ and N9026′ and longitudes 9011′E and 9015′30″E. With the increase of civil engineering constructions and the scramble for limited portions of competent soils for such constructions, there is an urgent need in a developing nation to study and characterize such soils based on its geotechnical properties. The geotechnical studies include twenty soil samples taken within the 1.5m depth with the aim of determining the swell potential in order to give appropriate guide to any civil engineering design and construction. The direct method of soil analysis which is the coefficient of linear extensibility (COLE), which ranges from 0.02–0.17 was used for the study. COLE Values greater than 0.06, were considered to be critical for most civil engineering design and constructions. Most of the samples studied were considered not safe for bungalows and some infrastructure without proper safety measures carried out to improve upon it.


2013 ◽  
Vol 62 (3) ◽  
pp. 487-496 ◽  
Author(s):  
Tadeusz J. Sobczyk

Abstract The paper discuss a problem of determination of inductances for AC machine windings when saturation of magnetic circuit is not neglected. For such cases, computation of magnetic field distribution in the machine magnetic circuit is a starting point for post processing procedures leading to various values, among others the co-energy in a given area and linkage fluxes of windings. This paper shows how to determine winding inductances in a nonlinear magnetic circuit from these two values and also how to compute directly nonlinear inductances. Problem is not trivial because such inductances are not uniquely determined as for linear case. In the paper a definition of nonlinear inductances is proposed which makes the choice unique.


2005 ◽  
Vol 56 (1) ◽  
pp. 86-124
Author(s):  
Kim Arne Pedersen

Grundtvig og fundamentalismen[Grundtvig and fundamentalism]By Kim Arne PedersenThe chosen starting-point is Ole Vind’s perception of Gr as a Biblefundamentalist. Vind constructs a concept of fundamentalism along idea-historical lines and focuses on what he perceives to be Gr’s literal reading of, especially, the Old Testament; but he also emphasises that for Gr the Scriptures were directly inspired by God.Through the introduction of a theological-historical and secularhistorical definition of the concept of fundamentalism, Gr’s relationship to the Bible is examined with the aim of mounting a critique of Vind’s interpretation. Gr’s view of the Bible in the period 1810-11 to 1824-25 is characterised against the background of that struggle with himself which his conversion in 1810 entailed, and with the introduction of the theological-historical definition of fundamentalism.This finds its starting-point in fundamentalism as a concrete historical phenomenon in the USA at the end of the 19th and beginning of the 20th century. It is distinguished by the resolution of traditional Christianity into five dogmatic points, including the dogma of verbalinspiration (every word in the Holy Scriptures is divinely dictated), to which is added the individual Christian’s personal inner experience with its basis in conversion.With this as background, Gr may be called fundamentalist in the period 1810 to 1824-25, since Gr (1) has been through a more or less pietistic conversion, (2) rejects a historical-critical approach to the Bible, (3) holds firm to verbal-inspiration, (4) rejects a modem interpretation of Christianity, (5) holds firm to traditional Christianity against the rationalists and would certainly have been able to subscribe to the fundamentalists’ five points, (6) rejects a scientific explanation of the world, and (7) believes that a form of scientific alternative to the world-picture of the natural sciences can be worked out on a Biblical basis. However, the theological-historical definition of fundamentalism needs to be supplemented by a secular-historical determination of the concept. Here a link is made with Uffe Østergaard’s demonstration of the significance of the art of printing in the Reformation as a prerequisite of fundamentalism, in that verbal-inspiration is thus placed centre-stage. Østergaard’s point is that fundamentalism is not only a reaction against modernisation, but is itself a modem phenomenon, and here he focuses upon the fundamentalists’ insistence upon a direct access to Scripture independently of religious tradition’s mediating influence. Here Østergaard’s observations are supplemented by the viewpoint that the revivalist movements of the 18th and 19th centuries are the foundation of fundamentalism; and the German concept-historical school’s concept of modernity is introduced, supplemented by Habermas’s Kant-inspired determination of subjectivity as the core of modernity, and of secularisation as a consequence of the differentiation of spheres of validity it entails.Finally, it is proposed that fundamentalism in a secular-historical sense must be seen as a consequence of secularisation as an historical phenomenon, affected by industrialisation and the dominance of the natural sciences after 1850. Thus fundamentalists belong in the period after 1850 as the second phase of modernisation, and they seek to direct society back to an idealised golden age.The core of the theological-historical definition of fundamentalism is the conflict between traditional religion and a modem interpretation of it; the core of the secular-historical definition is the conflict between modernisation/secularisation and a religious reaction against this, which desires the whole of society or a state within the state free of secularisation.After Gr’s struggle with aspects of his understanding of Christianity in 1824-25 his view of the Bible becomes freer and he breaks explicitly with the dogma of verbal-inspiration. However, Gr’s location in time itself, and his complex attitude towards modernity is of more importance. (1) Gr can hardly be lumped together with that group of modem intellectuals, people with education, who are related to industrial and post-industrial society and who are going through a fundamentalist conversion. Grundtvig belongs in another age, in modernity’s first phase from 1750 to 1850 - and his concept of modernity can be extrapolated from analyses of his complex attitude towards Kant’s concept of autonomy. The facts that (2) between 1811 and 1824 he is an adherent of verbal-inspiration, and (3) in his battle with Enlightenment theology (and in that connection with the ecclesiastical authorities) he turns against the traditional theological teaching institutions, and (4) he wishes to reform theology, are not sufficient grounds for characterising him as a fundamentalist, for Gr (5) does not want, as do the fundamentalists, a return to an idealized golden age. In Gr’s notion of the sequence of national congregations, and the fact that the one succeeds to the other, lies hidden a historical mentality stamped with the idea that the different congregations embody different characteristics. To conceptualise change is modem, and in that sense Gr is stamped with modernity. (7) Ultimately, Gr does not seek to stifle the scientific attempt to clarify the Bible and the world independently of a literal reading of the Old Testament. This Vind overlooks, when he alleges that even after 1825 Gr can be called a fundamentalist.The decisive characteristic which divides Gr from fundamentalism is really not his break with Bible-Christianity in 1823, 1824 and 1825, nor his related rejection of verbal-inspiration, but rather the opening of his mind in relation to the naturalists, and therewith the theologicallyorientated foundation of this opening upon two central concepts: his educational idea - that is, the separation between church and school - and his idea of freedom. The educational concept and the concept of freedom are indissolubly bound together, and Gr’s thematising of freedom in respect of things scientific is tied up with his consciousness of modernity.


sub-committee on the general chart of accounts and financial statements, headed by Lemoine and Pujol; and the sub-committee on cost accounting, headed by Martin [Brunet, 1951, p. 166]. The committee had to focus on accounting in industrial and commercial businesses as the starting point of what would ulti­ mately become a national rationalization of accounting. More, specifically, the accounting system chosen had to be simple, com­ plete and flexible enough to be applied to large companies as well as to the more numerous small and medium-sized companies. Finally, the orientation chosen by the plan’s designers was towards the determination of financial results for investors and creditors (particularly banks), and the determination of product costs for pricing purposes. Although finding a plan suitable for national accounting was not the primary goal of the committee, several measures were nonetheless adopted which stressed the economic orientation of the accounting reform. The economic concerns of the designers were reflected in the following features of the plan: 1. Classification of companies’ assets according to their eco­ nomic function or location; 2. In the balance sheet, grouping of accounts into classes that reflected the accounts’ economic function: permanent capi­ tal, long-term assets, inventories, third-party accounts and financial accounts; 3. The classification of expenses by type, which provided the necessary elements for the study of the economic situation at the company, industry and national levels; 4. The production of information on company operations to complete the financial statements, such as endorsements and commitments, or to facilitate the analysis of certain elements of the balance sheet (depreciation, fixed assets, provisions). Contents o f the 1947 Plan The plan constituted a complete set of accounting procedures, including [Veyrenc, 1950?; Retail, 1951]: 1. A definition of financial and cost accounting; 2. A chart of accounts (see Appendix) and related terminol­ ogy; 3. A list of the accounts and how they interact; 4. General rules for the application of the plan; 5. Valuation rules for assets; 6. Rules for determining depreciation and provisions;

2014 ◽  
pp. 345-345

Author(s):  
Laura L. Liptai ◽  
Lamb Rowland D.

This Study Examines The Theory And Methods Of Forensic Engineering Analysis Applied To Pedestrian Trauma And Fatality. Optimally Approached With The Collective Analysis Of Both The Accident Reconstruction Engineer And Biomedical Engineer, The Accident Reconstruction Engineer Translates The Physical Evidence Related To The Vehicle And Scene While The Biomedical Engineer Interprets The Physical Evidence Related To The Human Body In The Biological Tissues. With Both Disciplines, A Collaborative Understanding Can Be Gained Using The Vehicular And Human Tissue Physical Evidence Available. The Case Presented Involves A Pedestrian Verses An Automobile. The Collision Between A Pedestrian And Automobile Resulted In The Death Of The Pedestrian. Physical Evidence On The Vehicle Included: A Dent In The Front Right Fender; A Spider Web Glass Fracture Pattern On The Windshield In The Lower Right Comer; And A Dent In The Right A-Pillar. This Study Will Also Demonstrate What Can Be Learned From The Absence Of Classic Physical Evidence On The Vehicle And On The Pedestrian As Well As The Determination Of When A Kinematic Study Is Appropriate For Pedestrian Verses Automobile Investigation.


Author(s):  
Joel T. Hicks

One Definition Of Photogrammetry Is, The Use Of Photographs For Making Maps. For Our Purposes, Photogrammetry Means The Extraction Of Dimensions In One Plane From Oblique View Photographs. Although There Is Software To Analyze In Three Dimensions, This Discussion Is Limited To A Single Surface Or Plane. The Software Chosen For Illustration Is Trans4 By J. Rolly Kenny2, Which Employs The Four-Point Transformation Method. To Start An Analysis A Print Is Attached To A Digitizer Pad. Then, With The Software Primed And Waiting On A Signal, A Mouse Button Is Clicked When The Cross-Hairs Of The Mouse Are Placed Over A Point On The Print. The Digitizer Will Send A Stream Of Data Back To The Computer, And The Software Will Read And Store The Location Of The Pad Under The Print At The Point. When All Points Of Interest Have Been Located In Pad Coordinates, The Real Or Measured Coordinates Of Four Of The Points Are Entered By Hand. The Software Then Computes The Real Coordinates For All Of The Points. The Four Points Of Reference Are Called Base Points (Bp). No Three Of Them Can Be In A Line, And All Points Of Interest Must Lie On The Same Plane.


Author(s):  
Michael T. Postek

The term ultimate resolution or resolving power is the very best performance that can be obtained from a scanning electron microscope (SEM) given the optimum instrumental conditions and sample. However, as it relates to SEM users, the conventional definitions of this figure are ambiguous. The numbers quoted for the resolution of an instrument are not only theoretically derived, but are also verified through the direct measurement of images on micrographs. However, the samples commonly used for this purpose are specifically optimized for the measurement of instrument resolution and are most often not typical of the sample used in practical applications.SEM RESOLUTION. Some instruments resolve better than others either due to engineering design or other reasons. There is no definitively accurate definition of how to quantify instrument resolution and its measurement in the SEM.


Sign in / Sign up

Export Citation Format

Share Document