bluuebunny/crossref_metadata_2025 huggingface dataset:
Transforming Care at the Bedside: Managers’ and Health Care Providers’ Perceptions of Their Change Capacities
Authors: Lavoie-Tremblay Mélanie , O’Connor Patricia , Lavigne Geneviève L. , Biron Alain , Ringer Justin , Baillargeon Sophie , MacGibbon Brenda , Cyr Guylaine , Briand Anaïck
Published: October 2014

Background:

The Transforming Care at the Bedside (TCAB) project engages frontline health care providers as the leaders of change and improvement efforts in their work environment. This study explored how health care providers and managers from three TCAB units in a university-affiliated health care center perceived the development of their change capacities following their involvement in this program.

Method:

This descriptive, qualitative study involved focus groups and individual interviews.

Results:

Participants learned to work as a team and to expand their outlook. They had access to processes and tools to learn new skills. New relationships also developed among the various players, and they shared new roles, which enabled them to translate the desired changes into action and make the results visible.

Conclusion:

The study showed the TCAB program helps develop health care providers’ and managers’ change capacities.

J Contin Educ Nurs
. 2014;45(11):514–520.
Development of an Education Program to Improve Care of Patients With Dementia in an Acute Care Setting
Authors: Nayton Kate , Fielding Elaine , Brooks Deborah , Graham Frederick A. , Beattie Elizabeth
Published: October 2014

As the population ages, the number of patients with dementia in acute care environments is projected to increase rapidly. However, many acute care nurses have undertaken little or no dementia training, potentially leading to reduced quality of care for these patients. This article details the development and delivery of a tailored education program to improve the quality of care of patients with dementia in a large, urban hospital in Australia. Designed specifically for the existing context, environment, and knowledge levels, the program was developed from multiple inputs including expert opinion, literature on workplace and dementia care training, and feedback from participants. The program was delivered to acute care nurses and allied health staff within an outcome-based, microteaching model. The development and delivery techniques used in this program also are discussed.

J Contin Educ Nurs.
2014;45(12):552–558.
High Psychiatric and Medical Comorbidity in Youth with Bipolar Disorder and Attention-Deficit/Hyperactivity Disorder
Authors: Mitchell Rachel H.B. , Goldstein Benjamin I.
Published: October 2014

Comorbidity among youth with bipolar (BP) disorder and attention-deficit/hyperactivity disorder (ADHD), particularly in clinical settings, is the rule rather than the exception. The following is a brief, clinically focused overview of BP and ADHD and their comorbidity with substance use disorders (SUD), anxiety disorders, and medical problems. Both BP and ADHD have high prevalence rates of comorbid substance use disorders (in the realm of 50%) and anxiety disorders (35%–60%) that negatively impact prognosis, and thus deserve specific treatment, but few guidelines exist. Both BP and ADHD are associated with significant medical comorbidities—related to the disorder itself, and secondary to pharmacotherapy—that also require careful consideration, close monitoring, and prompt treatment. Both BP and ADHD have a relatively small evidence base to guide treatment of psychiatric comorbidities but nevertheless require a dual focus when planning treatment, concurrently and/or sequentially. In summary, when it comes to comorbidities, both BP and ADHD carry a substantial burden. Future treatment studies focusing on comorbidity are warranted to guide clinical decision-making in real-world samples that are characterized by comorbidity.

[
Psychiatr Ann.
2014; 44(10):459–465.]
Neurobiological Clues of Risk for Bipolar Disorder Development
Authors: Chang Kiki D. , Garrett Amy , Singh Manpreet
Published: October 2014

Bipolar disorder (BD) is a common, serious, and chronic disorder that leads to high morbidity and mortality in youth and adults worldwide. Determining those at significant risk for BD development would greatly aid in early identification and intervention efforts, designed to ameliorate the course of or prevent BD. As early psychiatric symptoms of BD in youth are nonspecific, biomarkers of risk for BD are necessary to guide these efforts. Neuroimaging has led to identification of some of these risk markers and provided a deeper understanding of the neuropathophysiology of BD development. Early abnormalities in prefrontal-amygdalar function may aid in prediction of risk and serve as targets for intervention to correct.

[
Psychiatr Ann.
2014; 44(10):466–470.]
Differential Treatment of Pediatric Bipolar Disorder and Attention-Deficit/Hyperactivity Disorder
Authors: Pavuluri Mani , May Amber
Published: October 2014

This article offers a pragmatic model of conceptualizing attention deficit hyperactivity disorder and pediatric bipolar disorder when they present alone, together, or as overlapping subsyndromes. Evidence-based findings from the US Food and Drug Administration-approved medications and randomized controlled trials of psychotherapy are quilted together to design a personalized treatment model. The treatment paradigm consists of an “ABCD” model of components: (A) Assessment of psychopathology toward individual diagnosis or comorbidity, (B) Brain circuitry function offering explanatory power for the phenomenology that includes affective and cognitive domain difficulties common in both the disorders, (C) Chemical imbalance addressed through pharmacotherapy for mania, mixed mania, depression, and attention deficit hyperactivity disorder, and (D) Delivery of proven psychosocial treatment coupled with addressing the key dynamics of interpersonal relationships. This intervention, based on empirical findings, is applicable to clinical practice. Identifying the neurocircuitry of cognitive and emotional impairment in pediatric bipolar disorder and attention-deficit/hyperactivity disorder guides the application of targeted treatments: a paradigm of translating science to clinical service.

[
Psychiatr Ann
. 2014; 44(10):471–480.]
Nonpharmacological Therapeutic Techniques to Decrease Agitation in Geriatric Psychiatric Patients With Dementia
Authors: Mitchell Ann M. , Chiappetta Laurel , Boucek Lynn , Cain Michelle , Patterson Georgia , Owens Kim , Herisko Camellia , Stark Kirsti Hetager
Published: October 2014

Agitation is not only a frequent and disturbing behavior for many patients with dementia, but it also troubles their caregivers and families. Many serious problems and side effects are associated with the use of medications to treat agitation; therefore, alternative approaches to treating agitation must be assessed. The current article presents results from a quality improvement pilot project that examined the usefulness of a specially designed, multisensory room intervention for geriatric psychiatric inpatients with mild to moderate agitation. Thirty-two visits to the sensory room were made by 13 inpatients with dementia. A significant decrease occurred in the Pittsburgh Agitation Scale (PAS) total scores over time from pre-room to post-room intervention, as well as 1-hour post-room intervention (
F
= 95.3,
p
< 0.001). Significant effects were found for all PAS subscales (i.e., aberrant vocalizations, motor agitation, and resistance to care), with the exception of the aggression subscale. The multisensory room intervention was effective in decreasing some symptoms of agitation in the geriatric psychiatric patient, thus contributing to positive patient, family, and nursing outcomes. [
Journal of Gerontological Nursing, 41
(2), 53–59.]
Efficacy of an Occupational Therapy Driving Intervention for Returning Combat Veterans
Authors: Classen Sherrilene , Cormack Nicole Leigh , Winter Sandra M. , Monahan Miriam , Yarney Abraham , Lutz Amanda Link , Platek Kyle
Published: October 2014

Polytrauma, including mild traumatic brain injury, posttraumatic stress disorder, and orthopedic conditions, is common among combat veterans (CVs) from Operations Enduring Freedom and Iraqi Freedom. Medical conditions, coupled with deployment-related training, may affect CVs' fitness to drive and contribute to post-deployment crash and injury risks. However, empirical interventions are lacking. Therefore, the study purpose was to examine the efficacy of an occupational therapy driving intervention (OT-DI) with pre and post testing of CVs. Using a DriveSafety 250 simulator, Occupational Therapy-Driver Rehabilitation Specialists recorded driving errors. Eight CVs (mean age = 39.83, SD = 7.80) received three OT-DI sessions, which incorporated strategies to address driving errors and visual search retraining. We determined baseline driving errors (mean = 31.63, SD = 8.96) were double the number of posttest errors (mean = 15.38, SD = 9.71). At posttesting, a significant (p < 0.05) decrease was noted for total errors and lane maintenance. Despite study constraints, preliminary data support the efficacy of the OT-DI.
The Social Context of Occupations: Analysis of a Father Feeding his Daughter Diagnosed with Cerebral Palsy
Authors: Bonsall Aaron
Published: October 2014

The purpose of this article is to examine a father feeding his daughter who is diagnosed with cerebral palsy in order to identify the contexts that make this occupation significant. The analysis of direct observation and interviews demonstrates significant moments where two individuals make intersubjective connections. Themes that are presented are the Intensity of Mealtime, Connections Between Participants, and Adapted Forms of Communication. Both the difficulties and rewards of mealtime are illustrated within these themes. This analysis reveals the structure and importance of doing together in influencing and determining occupations. From a clinical perspective, the meaningfulness of fathering occupations highlights the importance of including fathers in family-centered care.
Spectral-Domain Optical Coherence Tomography of Sympathetic Ophthalmia With Dalen–Fuchs Nodules
Authors: Muakkassa Nora W. , Witkin Andre J.
Published: October 2014

The authors present a case of sympathetic ophthalmia with Dalen–Fuchs nodules visualized with spectral-domain optical coherence tomography (SD-OCT). An 84-year-old man presented with floaters and decreased vision 25 years after penetrating trauma to the fellow eye. Examination revealed vitritis and subretinal lesions consistent with Dalen–Fuchs nodules. He was diagnosed with sympathetic ophthalmia after a negative systemic work-up. SD-OCT revealed hyper-reflective lesions at the level of the retinal pigment epithelium with disruption of the inner segment/outer segment (IS/OS) junction. Treatment resulted in clinical improvement and disappearance of Dalen–Fuchs nodules on SD-OCT; however, photoreceptor and retinal pigment epithelial disruptions persisted 5 months after treatment was initiated.

[
Ophthalmic Surg Lasers Imaging Retina.
2014;45:610–612.]
An Experimental Study
Authors: Ekwem Edith N. , Nisar Kashif
Published: October 2014

A network whose interconnections between nodes are implemented without using wires is referred to as wireless network and is usually related to a telecommunication network. As related to wired local area network, wireless channels are error-prone. Performance study and optimization of Wireless Local Area Network (WLAN) becomes more essential as its gaining popularity. For performance modelling and evaluation of wireless networks, computer simulation has become one of most widespread tools. While numerous network simulators exist for building a variety of network models, selecting a good network simulator tool is vital in modelling and performance study of wireless networks. Optimized Network Engineering Tools (OPNET) Modeller available to academic institutions at no cost is becoming one of the most widespread network simulators. In this study, the authors used OPNET Modeller 14.5 simulator tool to develop and validate a model for campus based WLAN. The results are expected to display that OPNET Modeller offers credible simulation outcomes close to a genuine system. The effect of network parameters such as the processing time on the performance metrics such as delay and throughput of the various scenarios in the entire network was investigated. The analysis of the results from the simulations carried out can assist the management of computer centre that manages the network in identifying the bottleneck node on the network and for future network capacity building. However, this wireless network involves too many numbers of users which OPNET is not capable to simulate; the authors limited the network to only users in the computer building.
Research on the Possibility of Replacing Oil with Water in Hydrostatics Units of Machine Tools
Authors: Prodan Dan , Bucuresteanu Anca , Balan Emilia
Published: October 2014

This paper deals with the possibility to replace the mineral oil with water in the hydrostatic units of machine tools. With this aim in view we try to make a technical-economic comparison between the hydrostatic drive that uses mineral oil in the range H38 - H46 and the drive with untreated water. Two simple units were taken for comparison, in principle, which use as hydraulic energy source one constant flow pump (qP= 4 cm3) for the actuation of two consumers and one constant flow pump (qP= 20 cm3) for making the hydrostatic suspension of the saddle of an AFP type machine.
Multi-Criteria Dynamic Optimization of a Front Wheels Suspension System
Authors: Alexandru Cătălin
Published: October 2014

This work deals with the dynamic optimization of the suspension system used for the front wheels of a race car. A multi-criteria optimization is approached, intending to minimize the main oscillations of the chassis (pitch, roll and yaw). The locations (in terms of global coordinates) of some joints in the suspension system are considered as design variables for the dynamic optimization. The dynamic model of the suspension system of the front wheels, corresponding to a half-car model, is developed in MBS (Multi-Body Systems) concept, while the relationships between the design objectives and variables are determined by statistical tools, based on design of experiments and regression models. The dynamic analysis is performed in the passing over bumps regime, the substantial improvements (by comparing the behavior of the initial and optimized suspension systems) demonstrating the usefulness of the adopted optimal design algorithm.
Adaptive Robotics
Authors: Ivanov Konstantin Samson
Published: October 2014

In work theoretical bases of an adaptive robotics are stated. The adaptive robotics considers creation, research and designing of robots with adaptive electric drives of modules. The adaptive drive contains the electric motor and the adaptive gear mechanism possessing property independently to change output speed of movement depending on loading. This property of adaptation is named by self-regulation. Self-regulation is carried out only for the account of mechanics and does not demand management. The adaptive drive demands smaller capacity, overcomes emergency overloads, is structurally simple, has small dimensions and weight. These advantages are especially important for intermediate modules of the manipulator. Use of adaptive drives procures high power efficiency of the robot.
Design of Geometrical Parameters for Walking Mechanism Leg with Use of Matlab Algorithm and SimMechanics
Authors: Bobovský Zdenko
Published: October 2014

This article describes the design of geometrical parameters for leg of six legged walking mechanism. Design uses an algorithm in Matlab program, created to use n-variables and a dynamic model of leg build in SimMechanics. Results from dynamic analysis of model are saved into nmatrixes. These matrixes are then assessed with values of criteria to get the optimal geometrical parameters of leg. The value of criteria affects the result parameters. To set the right values of criteria is used method Comparison of pairs. The design process is made for mechanism moved at horizontal and also inclined planes.
Generalization of the Lagrange Equations Formalism, for Motions with Respect to Non-Inertial Reference Frames
Authors: Stroe Ion , Craifaleanu Andrei
Published: October 2014

The paper presents an original generalization of the Lagrange equations of the second kind, for motions with respect to reference frames in arbitrary motions. The traditional form of the equations is modified by adding certain supplementary terms. Calculation methods are presented for these terms and some conclusions useful in practical applications are drawn. For validation, the new formalism is illustrated on the application of the Foucault pendulum. The results are in full agreement with those obtained by traditional methods. The formalism can be used to determine the motions of various mechanical systems, with respect to large size movable bodies (such as planets or orbital stations), that are not influenced by the relative motion of the studied parts.
Study of the Enwrapping Profiles Associated with Rolling Centrodes by the Minimum Distance Method — Graphical Solution Developed in the CATIA Design Environment
Authors: Teodor Virgil , Berbinschi Silviu , Baroiu Nicuşor , Oancea Nicolae
Published: October 2014

The issue of enwrapping surfaces study can be solved using the basic theorem Olivier or Gohman. Also, are known and used some specific theorems for the study of the enveloping of the helical surfaces. More, they were developed and applied complementary theorems as: “the minimum distance” method or “the inplane generating trajectories family”. The development of the graphical design environment allows the approach of the issue of surface enwrapping using the capabilities of this software. In this paper it is proposed a methodology for application of the “minimum distance method” for generation of the surface associated with a pair of rolling centrodes using various tools: rackgear tool and gear shaped tool. They are presented applications of this graphical method and the results. This proves the quality of the proposed method. The graphical methods have the advantages that are fast, rigorous and intuitive.
Modeling of Minimal Thickness Cutting Layer Influence on Surface Roughness in Turning
Authors: Mikolajczyk Tadeusz
Published: October 2014

The article presents the problem of the minimum thickness of the machined layer which dependent on the radius of the cutting edge. The minimum thickness of the cut layer significantly affect surface roughness on the edge of a certain geometry. The paper presents useful in the research analyses and didactics Profile software for the visualization of the effects of minimum thickness of the cut layer on the surface roughness
Trajectory Planning for Winding Carbon Wire of Composite Structures Using Cooperative Robots
Authors: Sbanca Madalin Petru
Published: October 2014

In this paper are presented aspects concerning robots trajectory planning for winding carbon wire around of a die, to obtain a composite structure which is used in automotive industry. One of the goals of the research is to realize parts using robots for creating one part and in the same time to optimize the cycle time comparing with manual method. Another goal of this study is to obtain a high accuracy of robot trajectory. This aspect is important because the shape of the final die is asymmetric and the robot tool must travel through small area. In this study are proposed new methods of robots cooperation and trajectory planning. For higher accuracy of the trajectory was introduced the virtual space for designing and testing the trajectory and then transpose in real space. Furthermore are carried out tests to prove the efficiency of proposed method.
Coupled Thermoelasticity Analysis of Annular Laminate Disk Using Laplace Transform and Galerkin Finite Element Method
Authors: Mehrian S.M. Nowruzpour , Nazari Amin , Naei Mohammad Hasan
Published: October 2014

In this paper, a dynamic analysis of annular laminate disk under radial thermal shock is carried out by employing a Galerkin Finite Element (GFE) approach. The governing equations, including the equation of the motion and energy equation are obtained based on Lord-Shulman theory. These two equations are solved simultaneously to obtain the displacement components and temperature distributions. A simply support boundary condition through outer edge is assumed for the annular disk. The inner radius is subjected to thermal shock and free of any traction. The outer edge is keeping at a constant temperature. Using Laplace transfer technique to transfer the governing equations into the space domain, where the Galerkin Finite Element Method is employed to obtain the solution in space domain. The inverse of Laplace transfer is performed numerically to achieve the final solution in the real time domain. The results are validated with the known data reported in the literature.
Armor with Hyper-Entropic Behaviour and Self-Protection
Authors: Tihanov Tanasache Daniel , Florea Carmen , Binchiciu Emilia , Geanta Victor
Published: October 2014

The paper presents research conducted in order to achieve some self-shielding armor with high and pre-established strength to intense wear abrasion combined with corrosion, in damp environment, with sulfur content, at temperatures up to 500°C. The first stage was dedicated to the elaboration of the concept of armor and the hardfacing technology, using a hyper-entropic filler metal which assures a self-protection characteristic. The samples used in the experiment were mild steel plates covered with weld in the rhomboid form. In the next stage some investigations were conducted in order to manufacture of new welding materials such as Fe-22%Cr-Mo-V deposited by welding in certain circumstances, having the hardness after welding about 30 HRC. This weld deposit becomes harder after a short working time, having average hardness value of 55 HRC. In stage three some exploratory research was done in order to establish the welding parameters for obtaining the self-protection layers of hyper-entropic material. In the final stage the armor element achieved was tested, to determine performance characteristics during working into the mill fan. After 2 weeks, some samples were sectioned in order to measure the hardening effect during working.
Methods for Determining the Characteristics of Laser Beams and the Optical Transmission
Authors: Nicola Iulian , Prisecaru Tudor
Published: October 2014

The paper presents new methods and procedures to measure the characteristics of laser beams and their transmission through optical systems. The paper describes the work procedures and equipments used to measure the characteristics of laser beams and their transmission through optical systems. Using these working procedures, experimental measurement for the characteristics of the beam for a 1.54 µm laser rangefinder and the transmission of a 633 nm laser beam through laser protection glasses were made.
Avalanche Prediction Based on Snow Level Monitoring Using Wireless Sensor Networks
Authors: Fireteanu Vlad Valentin , Tudor-Serban Andreea , Sacala Ioan Stefan , Moisescu Mihnea Alexandru
Published: October 2014

It can be difficult and expensive to prevent an avalanche, but preventing people from venturing into dangerous situations can prove to be an easy and inexpensive task. The aim of this paper is to develop an Avalanche Prediction System. Research conducted in order to understand the environmental conditions led to an accurate data acquisition process and an improved implementation of the hardware and software solution. One of the most important characteristics of the developed system is scalability. The system was tested using different test scenarios.
Shape Measurement Based on 3D Optical Scanner: Real Case Study in the Aeronautics Industry
Authors: de Felice Fabio , Petrillo Antonella , Carlomusto Armando
Published: October 2014

Three dimensional (3-D) geometric shape measurements have found wide applications in the fields of industrial manufacturing, fast reverse engineering, quality control, biomedical sciences, etc. In the present paper we focus our attention on Reverse engineering. It starts from an existing product, and creates a CAD (Computer Aided Design) model, for modification or reproduction of its design. This kind of process is usually undertaken in order to redesign a system for better maintainability or to obtain a copy of a system without access to design from which it was originally produced. There are many different methods for acquiring shape data. Tactile methods represent a popular approach to shape capture. The most commonly known forms are Coordinate Measuring Machines (CMMs) and mechanical or robotic arms with a touch probe sensing device. Non-contact methods use light, sound or magnetic fields to acquire shape from objects. In the case of contact and non-contact, an appropriate analysis must be performed to determine the positions of points on objects surface. The aim of this paper is to present a new reconstruction method of three-dimensional measuring system for objects acquisition:reverse engineering based on structured light system. This technique consists in projecting a known pattern of pixels (structured light) on an object: the way in which this pattern is deformed encountering the object surfaces, allows vision systems (a couple of monochromatic digital cameras) to calculate depth information necessary for surfaces digitization. The subsequent application of this methodology has been to reengineer an aeronautical component that has changed over time and divergent from initial project. At last have been studied proposals and possible solutions that ensure an higher quality of manufactured products and a substantial savings in costs of production system of the product itself.
Modeling and Simulation of the Gas Absorption Process in the Liquid Phase
Authors: Ungureşan Mihaela Ligia , Mureşan Vlad , Abrudean Mihail , Clitan Iulia , Coloşi Tiberiu
Published: October 2014

In this paper, a solution for the modeling and simulation of the gas absorption process in a liquid is presented. In the modeling procedure, the technological process is decomposed in two sub-processes connected in series, the first sub-process being considered a lumped parameter one, respectively the second sub-process being considered a distributed parameter one. In order to simulate, with a high accuracy, a process that includes in its structure a distributed parameter sub-process, an original method based on the matrix of partial derivatives of the state vector, associated with Taylor series, is used. The modeling-simulation procedure introduces the premise to approximate the concentration value of the gas absorbed in liquid, in relation to the initial pressure from the reactor, respectively the premise of including the technological process in a concentration control structure.
Cavitation Avoidance in Nitrous Oxide Rocket Engines Using the Efficient Transient 1D Downwind Prediction
Authors: Rugescu Radu D. , Bogoi Alina , Constantinescu Emil Cristian
Published: October 2014

Nitrous oxide has recently entered violently the arena of space propulsion and gained interest, due to its high energy and gasification potential and despite its low oxygen content as an oxidizing chemical and its instability over some 600 C. However, its physical and chemical instability soon proved to be a potential hazard and led to a renewed interest in the study of its behavior as a fluid. In the present contribution computer simulation of the liquid phase flow of the nitrous oxide under high pressure is used to predict and avoid the cavitation into the feeding line tract of rocket engines, specifically of the compound rocket engines feeding line. The method involves a substantially simplified 1-D description of the fluid motion with sufficiently accurate determination of cavitation risk where the feeding duct suffers blunt variations of the cross area or steep turns and corners involving sensible static pressure variations of the fluid. A means of avoiding dangerous behaviors of the nitrous oxide is thus developed that could increase safety margins during the handling of this quite unpredictable oxidizer for the compound, combined or hybrid rocket engines.
Design Optimization and Analysis of NACA 0012 Airfoil Using Computational Fluid Dynamics and Genetic Algorithm
Authors: Ganesh Ram R.K. , Cooper Yashaan Nari , Bhatia Vishank , Karthikeyan R. , Periasamy C.
Published: October 2014

CFD method is inexpensive method of analysis of flow over aerodynamic structure. It incorporates mathematical relations and algorithms to analyze and solve the problems regarding fluid flow. CFD analysis of an airfoil produces results such as lift and drag forces which determines the ability of an airfoil. Optimization of an airfoil involves improving the design of the airfoil in order to manipulate the lift and drag coefficients according to the requirements. It is a very common method used in all fields of engineering. MATLAB is a numerical computing environment which supports interface with other software. XFoil is airfoil analysis software which calculates the lift and drag characteristics for different Reynolds numbers, Mach numbers and angles of attack. MALAB is interfaced with XFoil and the optimization of NACA 0012 airfoil is done and the results are analyzed. The performance of optimized air foil is analyzed using ANSYS FLUENT software.
A Study of Laser Aided Activating TIG Welding
Authors: Yin Yan , Ta Jin Guo , Zhang Rui Hua , Wang Zhan Chong
Published: October 2014

Laser aided activating TIG welding was called LA-TIG. At first, the surface of weld was melted by the mini power laser protected by oxygen, and then the conventional TIG was used to cover the weld, which achieved the target of the weld with deeper penetration and narrower width. In this article, the weld bead morphology, arc images, microstructures and mechanical properties of laser aided activating TIG welding joint were analyzed. The results shows that the penetration increased significantly, excellent weld appearance and finger shape penetration were gained by laser aided activating TIG welding. It was found that the arc images of the LA-TIG was only the enlarged form compared with which observed in the conventional TIG and the arc constriction was also observed. LA-TIG weld exhibits better mechanical properties than the conventional TIG welding. Thus laser aided activating TIG welding was developed as a novel active welding method.
Application of Fault Diagnosis Method Based on cICA to Gearbox
Authors: Jing Shuang Xi , Guo Song Tao , Leng Jun Fa , Zhao Xing Yu
Published: October 2014

Constrained independent component analysis (cICA) is a new theory and new method derived from the independent component analysis (ICA).It can extract the desired independent components (ICs) from the data based on some prior information, thus overcoming the uncertainty of the traditional ICA. Early gearbox fault signals is often very weak ,characterized by non-Gaussian,low signal-to-noise ratio (SNR), which make the existing diagnosis methods in the diagnosis of early application restricted. In this paper,cICA algorithm is applied to gear fault diagnosis. Through the case studies verify the feasibility of this method to extract the desired independent components (ICs), indicating the applicability and effectiveness of the method.
Experimental and Numerical of Sloshing Effect on Heave and Pitch Motions of FLNG Vessel
Authors: Sinaga Luhut Tumpal Parulian , Utama I.K.A.P , Sulisetyono A.
Published: October 2014

Recently the demand of sloshing analysis is rising for building FLNG (Floating Liquefied Natural Gas) vessel. This study considers the experimental and numerical observations on strongly nonlinear sloshing flows in ship motion. The FLNG (Floating Liquefied Natural Gas) vessel was considered to be rigid body supported by non-permanent pole with distributed spring damper. Based on the general equation of the ship motion in waves, and various wave amplitude, various heading, wave period and critical fluid level on the cargo tank period governing equation induced by sloshing were derived. Several physical issues are introduced in the analysis of sloshing flows, and the corresponding numerical models are described. To study the sloshing effects on ship motion, a ship motion program based on impulsive response function (IRF) is coupled with the developed numerical models for sloshing analysis. The results show that the nonlinearity of sloshing-induced forces and moments plays a critical role in the coupling effects.
Mathematical Simulation and Design Optimization of a Novel Swing Vane Compressor
Authors: Zhang Jiang , Qu Zong Chang , Cang Rong , Yang Xu , Ma Xiao Hong
Published: October 2014

Swing vane compressor (SVC) is a novel rotary compressor, which is structurally simple with a small size, a light weight and smooth operation. The SVC also has advantages, such as reduced frictional losses and improved mechanical efficiency at high speed. In this paper, a mathematical model including the geometrical, thermodynamic, flow and input power aspects was formulated, which was then linked to an optimization algorithm to search for three main structural design parameters under three sets of design constraints, for an optimum compressor performance with maximum energy efficiency ratio (EER). In the end, the mathematical simulation of the compressor were given and the theoretical optimization study predicted that a large reduction in frictional loss could be possibly achieved, which brings about an improvement in EER of the compressor of about 8.55%.
Rotor-Dynamic Characteristic Evaluation of Generator Geothermal Power Plant Using Finite Element Method
Authors: Djunaedi Imam , Alam Hilman Syaeful , Nugraha Aditya Sukma
Published: October 2014

Dynamic characteristics of a critical speed of the rotor components at generator geothermal power plant is evaluated using finite element method. In this study, the critical speed is evaluated based on the over speed scenario at 100%, 120% and 150% of rated speed. The critical speed of the rotor is investigated in the Campbell diagram, which shows the relationship between natural frequency and rotational velocity of the system. Based on the rotordynamic evaluation using finite element, the critical speed at 100% and 120% of the operating speed occurs in the rotational speed of 2750 and 2837 rpm, while at 150%, the critical rotation occurs in the rotational speed of 2750, 2762 and 4051 rpm. It can be concluded that the speed ranges are the critical speed or the resonance region which can be as a direct cause of the component damage, therefore the operating speed should not work too long on that critical speed.
The Physical Properties (Enthalpy and Thermal Conductivity) of Mahogany Wood Induced by Pyrolysis Temperature Process
Authors: Wijayanti Widya
Published: October 2014

The recent work found the physical properties that greatly affected the transport phenomena; enthalpy values and thermal conductivity values in the pyrolysis process. In the previous work, it was assumed as constant variable. Meanwhile, there were a dependence between the variables and the pyrolysis temperature. Then, it would be calculated both physical properties by using bomb calorimeter and thermal conductivity testing apparatus.In the experimental runs, biomass was shaped in the form of needle particles about 1 μm and run 3 hours to produce char and tar yields. It was carried out at a temperature setting from 250°C to 800°C. To support analysis of the thermal conductivity values, the char yields were visualized by using direct photograph and SEM by 3000 times magnification to investigate the char quality based on the color and the structure of char material imaging their porrosities. The results showed that the entalpy values of char increased with the increasing of pyrolysis temperatures, however, the enthalpy values of tar inclined up to temperature of 500°C. Afterward, it decreased for the reason that the biomass was decomposed gas products in secondary reaction. Another result presented the thermal conductivity increased up to 500°C then it reached almost constant values. The increasing of the thermal conductivity values due to carbon and porosity of char.
Ground Moisture Condensation around the GSHP Borehole
Authors: Vasilyev G.P. , Peskov N.V. , Brodach M.M. , Lichman V.A. , Dmitriev A.N. , Gornov V.F. , Kolesova M.V. , Yurchenko I.A.
Published: October 2014

Presented in this article are the results of theoretical research carried out with financial support from the Ministry of Education and Science of the Russian Federation (contract ID RFMEFI57914X0026) and demonstrating the need to consider the changes in ground heat transfer properties in geothermal borehole heat modeling, due to moisture condensation/evaporation in the ground pores. It is our opinion that in GSHP systems design, the quantity of the boreholes is often overestimated and the associated parameters oversized while the extent of the ground heat transfer is underestimated. In most cases, in designing GSHP operation and performance, this is due to the incorrect assessment of the ground moisture content, which has a most tangible effect on the ground heat transfer properties. This article demonstrates the need to consider the ground moisture condensation/evaporation in GSHP systems design. Presented in the article is the mathematical simulation of the ground pore moisture condensation at the GSHP boreholes. Also presented is numerical data derived from the calculations to assess the effect of the ground pore moisture condensation on the borehole heat transfer efficiency. Through analysis and experimentation, it was determined that the ground pore moisture condensation have a substantial impact on the GSHP efficiency.
The Influence of Subway’s Underground Facilities Operation on the Natural Thermal Conditions of Adjacent Soil
Authors: Vasilyev G.P. , Peskov N.V. , Gornov V.F. , Yurchenko I.A. , Zakharov P.E. , Kolesova M.V.
Published: October 2014

This paper contains the results of research dedicated to improving the energy efficiency of Moscow subway facilities and creation of stations with "zero" external sources heat consumption. The paper presents a method of simulation of the thermal conditions for subway tunnels, which allows overcoming the difficulties associated with the informative uncertainty of baseline data, as well as difficulties associated with the approximation of the external parameters, affecting the soil's thermal conditions. Advantage of this method in comparison with the traditional approach to the modeling of thermal processes in such systems is the fact that the usage of so-called "base" experimentally obtained information about the natural soil thermal conditions in this model, can partially take into account the whole range of factors (such as presence of the groundwater, it's speed and thermal conditions, the structure and location of the soil layers, the "thermal" background from the Earth, precipitation, phase transformation of moisture in the pore space, and more), which have significant influence on the formation of the thermal regime of the tunnel but are almost impossible to be taken into account within the strict formulation of the problem today. The method has been implemented in the software package INSOLAR.GSHP.12, created by JSC "INSOLAR-INVEST".
Technical and Economic Aspects of Using Heat Pump Systems for Heating and Cooling of the Moscow Subway's Facilities
Authors: Vasilyev G.P. , Gornov V.F. , Kolesova M.V. , Brodach M.M. , Polishchuk V.P. , Piskunov A.A , Leskov V.A. , Dmitriev A.N. , Yurchenko I.A.
Published: October 2014

This paper contains the results of research, carried out with financial support from the Ministry of Education and Science of the Russian Federation and dedicated to improving the energy efficiency of Moscow subway facilities and creation of stations with "zero" external sources heat consumption. This paper vindicates the possibility and economic feasibility of creating subway facilities with "zero" external sources heat consumption, equipped with heat pump systems for heating and cooling, which improve indoor climate comfort of subway's stations and halls. The research carried out by the authors proves the efficiency of using heat pump systems for heating and cooling in the Moscow subway. The proposed technology requires lower nonrecurrent capital investments than traditional technology, as well as enables to save up to 80 % of energy. Considering the current prices for connecting to the centralized heating systems, the technology in question pays back at the stage of construction. The possibility of stabilizing thermal conditions at stations and in halls of the subway is an important advantage of this technology. Tis paper proposes schemes of heat pump equipment usage that allows reversing it for operation in cooling mode, which provide sufficient air conditioning and humidity control at stations, halls and service rooms. The authors evaluate the heat emission of passengers, that is removed with the exhaust air, to be about 0.15-0.17 billion kW*h annually. Thus the Moscow subway just dumps outside about 2.4 billion kW*h of thermal energy, including heat emitted by passengers, annually. If recycled this amount of energy is sufficient to cover all subway's requirements for thermal energy.
Digital Measurement and its Error Analysis for the Machining Free-Form Surface
Authors: Lu Feng , Li Ning , Zhang Xiao Fei
Published: October 2014

To deal with the lack of accurate and efficient inspection methods in complex free-form surfaces, three-dimensional measurement method based on the optical measurement and computer image processing technology was proposed. It adopted laser scanning technology to get point clouds of free-form surface. Used rapid measurement software to inspect precision of point cloud& CAD model. What could be the cause of machining errors was analyzed. 3D deviation inspection of complex surfaces was applied by an artifact. Detected the machining error of an important section, and outputted test report. This research provides a convenient and swift method for the inspection of free-form surface and processing quality control.
Research on Magnetoelectric Seismometer's Low Frequency Extension Technology
Authors: Teng Yun Tian , Hu Xing Xing , Lu Hong Ya
Published: October 2014

Magnetoelectric seismometer has many outstanding features, such as low cost, small size, light weight, high sensitivity, low noise, good high frequency response, and reliable operation, simple set up, so these type of seismometer is widely used in several areas. However, because the structure of magnetoelectric seismometer (inertial mass and elastic support module), there has the material and mechanical structure limitation, so the inherent frequency is around between 5 to 30Hz, hard to be lower, hence, the low frequency characteristic is poor. To extend the seismometer's range of application, post compensation is needed. The researchers from both home and aboard proposed many different method to deal with the low frequency response of this seismometer, such as “inverse filter” method, “Lippmann” method, which uses negative resistance and feedback coil. These methods have got some results separately. In this paper, we will propose a low frequency integral method to extend the seismometer's frequency response. It is accomplished through balanced integration and high precision chips to suppress the circuit drifting and noise interference. The results from vibration table shows, after integration, the seismometer's low frequency corner frequency is extended from 2 Hz to under 0.1 Hz, the sensitivity is enhanced from 200V/m·s-1to 400V/m·s-1.
Effect of T6 Treatment on Low-Cycle Fatigue Properties of Al-6Zn-2.5Mg-2Cu-0.1Zr-0.1Sc Alloy
Authors: Lan Ying , Chen Li Jia , Che Xin , Li Feng
Published: October 2014

The low-cycle fatigue behaviors of as-extruded and T6 treated Al-6Zn-2.5Mg-2Cu-0.1Zr-0.1Sc alloys at room temperature have been investigated under those total-strain amplitudes ranged from 0.3% to 1.0%, and the influence of T6 treatment on the low-cycle fatigue properties of Al-6Zn-2.5Mg-2Cu-0.1Zr-0.1Sc alloy was clarified. The experimental results show that during fatigue deformation, the significant cyclic strain hardening and stable cyclic stress response can be noted for both as-extruded and T6 treated Al-6Zn-2.5Mg-2Cu-0.1Zr-0.1Sc alloys. The fatigue life of as-extruded Al-6Zn-2.5Mg-2Cu-0.1Zr-0.1Sc alloy at all strain amplitudes is longer than that of the alloy subjected to T6 aging treatment. The relationship between both elastic and plastic strain amplitudes with reversals to failure shows a monotonic linear behavior, and can be described by the Basquin and Coffin-Manson equations, respectively. The T6 treatment can significantly increase the cyclic strain hardening exponent and cyclic strength coefficient of extruded Al-6Zn-2.5Mg-2Cu-0.1Zr-0.1Sc alloy.
Effects of Non-Equilibrium Solidification and Aging Treatment on Microstructure Characteristic of a Ni-Base Superalloy
Authors: Li Da Fan , Hu Xiao , Yang Wei
Published: October 2014

Copper mould spray casting and aging treatment were performed to investigate the microstructure evolution of a Ni-base superalloy. With increasing the cooling rate during solidification, the morphology of primary γ phase changes from coarse dendrite to fine dendritic structure with radial-like feature, accompanied by the inhibition of γ′ phase due to the shortened period during the subsequent solid state transformation process. After aging treatment, both the size and volume fraction of γ′ phase are increased with prolonging the isothermal time, which generate the morphology transition of precipitates from irregular and spherical to ellipse and rectangle due to the competition between the interface energy and strain energy.
Measurement of Polycrystalline Diamond Craters in Electrical Discharge Machining
Authors: Hu Bo , Ding Song Lin , Lim Christopher , Brandt Milan , Mo John
Published: October 2014

The electrical discharge grinding method is widely used to machine polycrystalline diamond tools because diamond is the hardest material and the traditional abrasive grinding method leads to high tool wear rate. The aim of this study was to find a method to precisely measure the individual diamond crate morphology during the electrical discharge process. A 3D microscopy with the focus-variation technique was chosen to obtain the stereolithography file of the polycrystalline diamond craters. The measurements were shown that the polycrystalline diamond crater morphology is more complex than that of normal tungsten carbide material. This finding can help build more accurate model of polycrystalline crater formation during electrical discharge process.
Stability Analysis of the AC Filter Capacitor Structure
Authors: Wang Yong Jing , Ge Jin Ping , Wang Yin , Zhang Ling
Published: October 2014

In the UHV DC transmission engineering, mechanical strength and reliability of the capacitor structure is the premise to resist natural disasters such as earthquake or fierce wind. However, there are some unreasonable design problems or phenomena in which the structural strength and stiffness can not meet the structural stability requirements. In this paper, by using Solid Works software, the solid models of the capacitor structure with tilting layer and without tilting one are presented respectively at first. And then, the dynamic simulations of the structure are carried out by means of finite element method, that’s the numerical simulation software WORKBENCH module in ANSYS and meanwhile the stress value changes of some models are compared and discussed. At last, the results show that the stability of the structure with sloping layers is no better than the one without sloping layers. This paper provides some references for designing the capacitor structure with good stability and low production cost.