scholarly journals Unified Tanker Survey and Inspection Regime in Terms of Reducing Psychophysical Strain of the Crew

2017 ◽  
Vol 29 (4) ◽  
pp. 455-461
Author(s):  
Toni Bielić ◽  
Mirano Hess ◽  
Luka Grbić
Keyword(s):  
Present Method ◽  
New Method ◽  
Inspection Time ◽  
Quality And Safety ◽  
Negative Effect ◽  
Annual Duration

The paper focuses on analysis of the effect of various surveys and inspections on the psychophysical behaviour of the crew. After analysing the scope and the extent of each regime, the authors identified more than 60% of surveys overlapping each other. Furthermore, the results of the survey conducted among seafarers indicate that the present method of carrying out ship surveys and inspections have a negative effect on the psychophysical condition of the crew. Therefore, a new method of tanker inspections has been proposed in order to reduce the psychophysical strain of the crew. The proposed method would minimise the annual duration of the inspections up to 30% and improve inspection time coordination without compromising quality and safety of the ships.

New Method for Determination of Aminolaevulinate Dehydratase Activity of Human Erythrocytes as an Index of Lead Exposure

1974 ◽  
Vol 20 (10) ◽  
pp. 1287-1291 ◽  
Author(s):  
Katsumaro Tomokuni
Keyword(s):  
Enzyme Activity ◽  
Ion Exchange ◽  
Present Method ◽  
Aminolevulinic Acid ◽  
Usual Method ◽  
Human Erythrocytes ◽  
New Method ◽  
Ion Exchange Column ◽  
Dehydratase Activity

Abstract I describe a new method for measurement of aminolaevulinate dehydratase (EC 4.2.1.24) activity of human erythrocytes. In this method, the amount of substrate δ-aminolevulinic acid consumed (instead of the amount of porphobilinogen formed) is determined colorimetrically. In the incubation mixture, the δ-aminolevulinic acidpyrrole produced by the condensation of δ-aminolevulinic acid with ethyl acetoacetate is separated from porphobilinogen by extraction with ethyl acetate, without resorting to ion-exchange column chromatography. The pyrrole-containing extract is treated with a modified Ehrlich's reagent. Activity of the enzyme is expressed as micromoles of δ-aminolevulinic acid consumed per minute per liter of erythrocytes. Enzyme activity is more accurately estimated by the present method than by the usual method in which porphobilinogen is measured.

Damage Path Simulation of Solder Joints in QFP

2005 ◽  
Author(s):  
Minoru Mukai ◽  
Kenji Hirohata ◽  
Hiroyuki Takahashi ◽  
Takashi Kawakami ◽  
Kuniaki Takahashi
Keyword(s):  
Crack Propagation ◽  
Present Method ◽  
Printed Circuit Board ◽  
Solder Joints ◽  
Fatigue Cracks ◽  
New Method ◽  
Circuit Board ◽  
Crack Model ◽  
Element Analysis ◽  
Electronic Package

Fatigue life prediction of solder joints is one of the most important areas of research in the development of reliable electronic packages. Recent trends in electronic package development indicate a shift toward smaller solder joints and larger package sizes, and temperature changes under field conditions are also becoming greater. Since reliability design of solder joints has become severer, the estimation of the crack propagation is becoming important like the estimation of the crack initiation. In the present study, a new method of estimating the crack propagation, which is based on finite element analysis without geometrical crack model, was examined, in order to ensure suitability for practical use in electronic package design. On the basis of a damage model assumed for Sn-37Pb solder, the new method called ‘damage path simulation’ was verified for solder joints in QFP (Quad Flat Package). In the case of solder joints of the gull-wing type, fatigue cracks are commonly initiated from the upper surface of the solder fillet, and propagated in the vicinity of the interface with the outer lead. It was clear that the extension of the damage path showed good agreement with the behavior of crack propagation observed in the actual thermal cycle tests. Damage path extension from a pointed end of outer lead is also simulated simultaneously with that from the upper surface of the solder fillet, and both damage paths were finally combined at a gap between outer lead and printed circuit board. The advantage of the present method is especially evident when the fatigue cracks were initiated from two or more regions. From the results of this study, it was concluded that the estimation of the crack propagation in solder joints based on the present method is satisfactory for engineering purposes.

A new method of solution for one-dimensional quasi-neutral bounded plasmas

2010 ◽  
Vol 76 (3-4) ◽  
pp. 617-625 ◽  
Author(s):  
M. KAMRAN ◽  
S. KUHN
Keyword(s):  
Present Method ◽  
Analytic Solution ◽  
Ion Source ◽  
New Method ◽  
Ion Density ◽  
One Dimensional ◽  
Plasma Equation ◽  
Neutrality Condition ◽  
Bounded Plasma ◽  
Method Of Solution

AbstractA new method is proposed for calculating the potential distribution Φ(z) in a one-dimensional quasi-neutral bounded plasma; Φ(z) is assumed to satisfy a quasi-neutrality condition (plasma equation) of the form ni{Φ(z)} = ne(Φ), where the electron density ne is a given function of Φ and the ion density ni is expressed in terms of trajectory integrals of the ion kinetic equation. While previous methods relied on formally solving a global integral equation (Riemann, Phys. Plasmas, vol. 13, 2006, paper no. 013503; Kos et al., Phys. Plasmas, vol. 16, 2009, paper no. 093503), the present method is characterized by piecewise analytic solution of the plasma equation in reasonably small intervals of z. As a first concrete application, Φ(z) is found analytically through order z4 near the center of a collisionless Tonks–Langmuir discharge with a cold-ion source.

Research on Tool Radius Compensation for 4-Axis Gang Control Grinding of Rolling Cutter Curve-Edge

2006 ◽  
Vol 304-305 ◽  
pp. 516-520
Author(s):  
Zhen Ruan ◽  
De Jin Hu
Keyword(s):  
Present Method ◽  
Work Life ◽  
New Method ◽  
Comparative Experiment ◽  
Curve Edge ◽  
Processing Error ◽  
Radius Compensation

Rolling cutter curve-edge is a complex spatial curve. This paper states the present method of tool radius compensation for grinding it by 4-axis gang control grinding center, analyzes the existence of processing error due to this method, and proves the error can not be neglected. To avoid the error, a new method of tool radius compensation based on vector decoupling is raised. From a comparative experiment, it shows that the new method can promote processing precision and enlarge work-life of rolling cutter evidently.

Development of System Based Code: Part 1—Reliability Target Derivation of Structures and Components

2010 ◽  
Author(s):  
Kenichi Kurisaka ◽  
Ryodai Nakai ◽  
Tai Asayama ◽  
Shigeru Takaya
Keyword(s):  
Fast Reactor ◽  
Present Method ◽  
Structural Reliability ◽  
Cooling System ◽  
New Method ◽  
Analysis Model ◽  
Energy Agency ◽  
Target Value ◽  
Static Failure

The present paper describes a new method for determining the target value of structural reliability in the framework of the System Based Code (SBC) by considering the safety point of view. In the new method, the reliability target is derived from the proposal to a quantitative safety goal that was published by the nuclear safety commission (NSC) of Japan and the quantitative safety design requirements on the core damage frequency (CDF) and the containment failure frequency (CFF) that were determined in the Fast Reactor Cycle Technology Development (FaCT) project by Japan Atomic Energy Agency (JAEA), by utilizing analysis models of a probabilistic safety assessment (PSA). The present method was applied to determination of the reliability target of the structures and components which constitute the reactor cooling system in the Japanese sodium-cooled fast reactor (JSFR). The risk from the reactor is expressed with sum of combination of various elements in the PSA analysis model. Those elements include not only static failure of the structures and components. However, the present study focuses on the sequences including the static failure, and the probability of dynamic failures and human errors in those sequences is conservatively assumed as a unity. It was confirmed that the present method combined with the PSA analysis model for internal initiating events is applicable to determination of the reliability target associated with a random failure of the structures and components, and that the method related to seismic initiating events can derive the target value of the occurrence frequency at which any of the important structures and components fails due to an earthquake.

Improved Method of Data Processing for Flocculating Sedimentation Experiment

2012 ◽  
Vol 599 ◽  
pp. 340-343
Author(s):  
Yan Lin ◽  
Shu Wen Guo ◽  
Jing Hua Lin
Keyword(s):  
Data Processing ◽  
Removal Efficiency ◽  
Conventional Method ◽  
Present Method ◽  
New Method ◽  
Improved Method ◽  
Partial Removal

The shortages of the present method of data processing of flocculating sedimentation are pointed out and analyzed in this study. A new method of data processing is put forward and the advantages of this new method are discussed. Compared to the conventional method, the isolines of partial removal efficiency need not to be drawn when the new method is employed and the new method is straightforward, practical and accurate and it is worth to be popularized.

The stability of viscous flow between rotating cylinders. II

1962 ◽  
Vol 268 (1333) ◽  
pp. 145-152 ◽  
Keyword(s):  
Viscous Flow ◽  
Present Method ◽  
Adjoint System ◽  
Numerical Results ◽  
New Method ◽  
System Of Equations ◽  
Rotating Cylinders ◽  
Characteristic Value ◽  
The Stability ◽  
The One

In this paper a new method is described for solving the characteristic value problem underlying the theory of the stability of viscous flow between rotating cylinders. The method depends on solving a simpler adjoint system of equations. It is shown that the present method is superior to the one described in an earlier paper (Chandrasekhar 1958). Numerical results are given for the case when the ratio of the radii of the two cylinders is one-half.

Phosphomolybdic Acid (PMA)-catalyzed One-pot Synthesis of 2,3- Dihydroquinazolines

2019 ◽  
Vol 16 (8) ◽  
pp. 683-687
Author(s):  
Chuanhuan Chen ◽  
A. Xuejiao ◽  
Xia Li ◽  
Guoli Huang ◽  
Bo Liu
Keyword(s):  
Reaction Time ◽  
Present Method ◽  
Room Temperature ◽  
Phosphomolybdic Acid ◽  
New Method ◽  
High Yield ◽  
One Pot ◽  
Short Reaction Time ◽  
One Pot Synthesis

We have developed a new method for the synthesis of 2,3-dihydroquinazolin-4(1H)-ones in good to excellent yields via phosphomolybdic acid (PMA)-catalyzed cyclocondensation of 2- aminobenzamides with aldehydes or ketones in N,N-dimethylformamide (DMF) at room temperature. The present method proves to be efficient in terms of short reaction time, high yield, simple workup and easy purification.

Note on Gill's solution for free convection in a vertical enclosure

1979 ◽  
Vol 90 (3) ◽  
pp. 561-568 ◽  
Author(s):  
Adrian Bejan
Keyword(s):  
Heat Transfer ◽  
Boundary Layer ◽  
Nusselt Number ◽  
Free Convection ◽  
Present Method ◽  
New Method ◽  
Upward Flow ◽  
Convection Regime ◽  
Numerical Heat Transfer ◽  
Alternative Approach

This paper develops an alternative approach to evaluating the arbitrary constants found in Gill's solution for the boundary-layer free-convection regime in a vertical rectangular enclosure. The new method consists of calculating the net upward flow of energy through the enclosure and setting it equal to zero near the top and bottom boundaries of the cavity. The present method takes into account the impermeable and adiabatic properties of the horizontal end walls. The overall Nusselt number derived on this new basis is shown to agree well with available experimental and numerical heat-transfer correlations.

Evaluation of dielectric parameters for dilute solutions at microwave frequencies using a numerical curve fitting technique

1981 ◽  
Vol 59 (2) ◽  
pp. 244-248 ◽  
Author(s):  
J. Gowri Krishna ◽  
M. Jeyaraj ◽  
J. Sobhanadri
Keyword(s):  
Curve Fitting ◽  
Present Method ◽  
New Method ◽  
Dilute Solutions ◽  
Dielectric Parameters ◽  
Microwave Frequencies

A new method involving an elegant computer curve fitting technique is discussed for evaluating ε′ and ε″, for dilute solutions at X- and Q-bands, with a greater accuracy. Four compounds with rigid (chlorobenzene) and nonrigid (anisole, phenol, and guaiacol) molecules have been tested with this method. The important advantage of the present method is that it involves no mathematical assumptions. The error involved in evaluating ε′ and ε″ is estimated to be 1% and 1–2% respectively.

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