Soliton-potential interaction in the nonlinear Klein-Gordon model

The interaction of solitons with external potentials in nonlinear Klein-Gordon field theory is investigated using an improved model. The presented model has been constructed with a better approximation for adding the potential to the Lagrangian through the metric of background space-time. The results of the model are compared with another model and the differences are discussed.Comment: 14 pages,8 figure

Effect of Replacement of Tubifex SP. with Commercial Shrimp Pellets for Growth and Survival Rate of Climbing Perch (Anabas Testudineus)

This research was conducted from October 29th 2015 until November 26th 2015 at Hatchery and Breeding Laboratory, Faculty of Fisheries and Marine Sciences, University of Riau. The aim of this research was to determine subtitusion (Tubifex sp.) with commercial shrimp pellets for the growth and survival Rate of climbing perch (Anabas testudineus) larvae. The method used was an experimental method by using a completely randomized design (CRD) with five treatments and three replications. Treatments applied were T4PU0 (Tubifex sp. four week), T3PU1 (Tubifex sp. three week + commercial shrimp pellets one week), T2PU2 (Tubifex sp. two week + commercial shrimp pellets two week), T1PU3 (Tubifex sp. one week + commercial shrimp pellets three week). T0 PU4 (commercial shrimp pellets four week). The results showed that larvae fed on T3PU1 (Tubifex sp. three week + commercial shrimp pellets one week), average of absolute length 3,06 cm, average of absolute weight 0,745 g, and spesific growth rate 15,41%, with the highest survival rate on T2PU2 (Tubifex sp. two week + commercial shrimp pellets two week) 86,67%. Results of water quality measurements in the temperature, pH and dissolved oxygen was 27–290 C, 4,5-6,9 and 2,3 – 6,9 ppm/L respectively

Rearing of Green Catfish Larvae (Hemibagrus Nemurus) with Different Protein Source of Paste Feed

The research on rearing of green catfish larvae (Hemibagrus nemurus) with different protein source of paste feed was carried out for 40 days in the Laboratory of Fish Hatchery and Breeding Faculty of Fisheries and Marine Sciences University of Riau. The aim of this study was to evaluate the substitution of tubifex worm with different protein sources of paste feed. Protein sources used were squid meal, fish meal, cockle meal and mysid meal. The effect on growth and survival was determined.Result showed that tubifex worm cauld not be substituted by the paste feed in rearing green catfish larvae for 40 days rearing period. Among the paste feed, the squid meal protein source paste feed was the best and more efficient in term of highest survival rate and the lowest cost per fish

A consistent scalar-tensor cosmology for inflation, dark energy and the Hubble parameter

The authors are grateful for financial support to the Cruickshank Trust (CW), EPSRC/GG-Top (CW, JR), Omani Government (MA), Science Without Borders programme, CNPq, Brazil (DR), and STFC/CfFP (CW, AM, RB, JM). CW and AM acknowledge the hospitality of CERN, where this work was started. The University of Aberdeen and University of Edinburgh are charitable bodies registered in Scotland, with respective registration numbers SC013683 and SC005336.Peer reviewedPostprin

Fatigue crack propagation in HSLA steel specimens subjected to unordered and ordered load spectra

Prediction of fatigue crack propagation in metallic structures subjected to dynamic random load spectra, containing variable overloads and underloads, is challenging because of possible retardation and acceleration effects. In this paper, fatigue crack growth behaviour under random spectrum load is investigated on ESE(T) specimens made of DNV 460 steel, which is an HSLA steel widely used in the offshore industry. A reference spectrum composed of a sequence of random loads is transferred into various reduced and ordered spectra. Reduced spectra have been defined based on a peak-valley segmentation algorithm and on the deletion of non-damaging events. Ordered spectra consist of block loading sequences determined by rainflow counting methods. Specific control software has been developed that allows to execute the K (stress intensity factor) controlled experimental program and perform on-line crack growth measurement using a material compliance method. The different spectra are compared in terms of total crack extension and retardation in crack growth rate. Algorithms for crack growth simulation have been implemented in Abaqus using both existing and adapted plastic zone models. Numerical results are critically compared to the experimental data

Emily Dickinson and confessional poetry

The purpose of this study is to introduce Emily Dickinson as a precursor of the post World War II generation of confessional poets, and to offer a reading of her poems on the basis of her personal experiences and on the basis of a unique presentation of the self in her art. Emily Dickinson was the promoter of an American tradition of the poetry of the self which was interrupted by the objective trend in literature that culminated in the works of T.S. Eliot and the imagists of the post World War I generation who maintained, in Eliot\u27s words, that the more perfect the artist, the more separate in him will be the man who suffers and the mind which creates, the more perfectly will the mind digest and transmit the passions which are its material. Confessional poets saw no such separation. For them the man who suffers is the one who creates. By breaking away from the earlier tradition of personal poetry with all its Puritan manifestations, and by introducing new innovations in form and content, Emily Dickinson provided a background for the post-imagist poets of the 1960\u27s. Her importance derives from three aspects of her poetry. First, her representation of a tragic, rebellious, independent and profound self which finds therapy in writing poetry. Second, her feminist tendencies which are typical of modern poets who associate feminism with confessionalism. Third, her treatment of twentieth century themes popular among confessional poets, such as alienation, loneliness, suicide, death, personal failure and mental breakdown

The Nuts and Bolts of Einstein-Maxwell Solutions

We find new non-supersymmetric solutions of five-dimensional ungauged supergravity coupled to two vector multiplets. The solutions are regular, horizonless and have the same asymptotic charges as non-extremal charged black holes. An essential ingredient in our construction is a four-dimensional Euclidean base which is a solution to Einstein-Maxwell equations. We construct stationary solutions based on the Euclidean dyonic Reissner-Nordstrom black hole as well as a six-parameter family with a dyonic Kerr-Newman-NUT base. These solutions can be viewed as compactifications of eleven-dimensional supergravity on a six-torus and we discuss their brane interpretation.Comment: 29 pages, 3 figure

Model based development of torque control drive for induction motors for micro electric vehicles

Electric vehicles are attaining significant attention recently and the current legislation is forcing the automotive industry to electrify the productions. Regardless of electric energy accumulation technology, drive technology is one of the vital components of EVs. The motor drive technology has been mainly developed based on the application which required position/velocity control. In automotive application, however, torque control is an important aspect since the drivers have already used to drive the vehicle based on torque control approach in traditional powertrain system. In this article, a model-based approach is employed to develop a controller which can guarantee the precise control of the induction motors torque for a micro electric vehicle (EV) application regardless of operating conditions. The implementation of the control drive was conducted in MATLAB/Simulink environment, followed by Model In the Loop simulation and testing at various test conditions to confirm the robustness of the developed drive. Direct Torque Control (DTC) with optimum voltage vector selection method is employed to control the motor torque that requires fewer power electronics to process its operation and hence lowers the cost of implementation. The result shows the practicality of the designed control system and its ability to track reference torque commands. Vitally, the controlled approach shows fair abilities to control IMs to produce torque at both the motoring and regenerative modes which is a highly important requirement in electrical propulsion powertrains. Furthermore, the controller’s response time was within the industrial standard range which confirms its suitability for industrial implementation at low cost

Simulation-based training in Ebola Personal Protective Equipment for healthcare workers: Experience from King Abdulaziz University Hospital in Saudi Arabia

Background: Millions of Muslims from across the world gather annually to perform pilgrimage. This can import unusual communicable diseases such as Ebola. Communicable diseases with a high risk of mortality necessitate special training to master the required competency to avert transmission of infections. The efficacy of simulation-based training (SBT) has been shown in such circumstances. Objective: We sought to develop an SBT program in Ebola Personal Protective Equipment (PPE) for all healthcare workers (HCWs). Methods: We conducted a quasi-experimental study at the clinical skills and simulation center at the King Abdulaziz University. An interdisciplinary committee was formed to develop this program in three stages. Pre-intervention: Needs assessment “Diagnostic drill”; we conducted in-situ simulation in the emergency department (ED). High-fidelity simulator (HFS) was used as a suspected Ebola case to assess HCWs’ competency of PPE. We used a checklist that was developed in accordance with the national and international guidelines. We then conducted “Train the Trainer in Ebola PPE” course to develop potential instructors. Intervention: PPE competency SBT courses. This involved focusing on trainees to be skilled in Ebola PPE and becoming trained observers using skill stations and Ebola scenario with HFS, followed by debriefing. All courses gathered participants’ evaluations, pre, and post-tests. Post-intervention: In-situ simulation in the ED two months later that was similar to the diagnostic drill. Results: Pre-intervention: 7 HCWs were involved in the drill, the average score was 37% of the checklist items. For train the trainer, 19 potential PPE instructors attended the program; of them, 65% were female and 35% male, and 6 were physicians and 13 nurses. Average pre and post-tests scores were 72% and 86%, respectively. Intervention: 10 PPE courses that were attended by 179 HCWs; of them, 67% were female and 33% male, and 52 were physicians, 112 nurses, and 15 others. Pre and posttests were 67% (57–75%) and 85% (81–91%), respectively, with a p-value \u3c 0.01. Post-intervention: Post Program drill\u27s average score was 86% of the checklist items (37% in diagnostic drill). Conclusions: Using SBT could be an effective method of developing competent HCWs in Ebola PPE. © 2018 The Author