scholarly journals Hydrostatic Bandsaw Blade Guides for Natural Stone Cutting Applications

2020 ◽  
Author(s):  
Ammar Ahsan ◽  
Jonas Kröger ◽  
Kyle Kenney ◽  
Stefan Böhm
Keyword(s):  
Research Work ◽  
Original Research ◽  
Pressurized Water ◽  
Premature Failure ◽  
Abrasive Particles ◽  
Ceramic Block ◽  
Straight Line ◽  
Guide System ◽  
Stone Cutting ◽  
Blade Cutting

Bandsaws either use fibre or ceramic block or sealed bearings as blade guides. This works well for cutting metals, wood and plastics. However, highly abrasive particles generated while cutting stones, settle between the contacts of the blade and the guides causing wear and premature failure. Hydrostatic guide system as presented in this work, is a contactless blade guiding method that uses force of several pressurized water jets to keep the blade cutting in a straight line. For this investigation, cutting tests were performed on a marble block using a galvanic diamond coated bandsaw blade with the upper roller guides replaced by hydrostatic guides. The results show that the hydrostatic guides help to reduce the passive force to a constant near zero in contrast to the bearing guides. This also resulted in reduced surface roughness of the stone plates that were cut. Additionally, it has also been shown that using hydrostatic guides the bandsaw blade can be tilted to counter the bandsaw drift. This original research work has shown that the hydrostatic guide systems are capable of replacing and in fact perform better than the state of the art bearing or block guides specially for stone cutting applications.

scholarly journals Hydrostatic Bandsaw Blade Guides for Natural Stone-Cutting Applications

2020 ◽  
Vol 4 (1) ◽  
pp. 20
Author(s):  
Ammar Ahsan ◽  
Kyle Kenney ◽  
Jonas Kröger ◽  
Stefan Böhm
Keyword(s):  
Research Work ◽  
Original Research ◽  
Pressurized Water ◽  
Premature Failure ◽  
Abrasive Particles ◽  
Water Jets ◽  
Hard And Brittle Materials ◽  
Guide System ◽  
Stone Cutting ◽  
Natural Stones

In a bandsaw machine, the blade guides provide additional stiffness and help to align the blade near the cutting region. Typically, these are either in the form of blocks made of carbide or ceramics or as sealed bearings. Abrasive particles, generated while cutting hard and brittle materials like natural stones, settle between the contact surfaces of the guides and the blade causing wear and premature failure. The hydrostatic guide system, as presented in this work, is a contactless blade guiding method that uses the force of several pressurized water jets to align the blade to the direction of the cut. For this investigation, cutting tests were performed on a marble block using a galvanic diamond coated bandsaw blade with the upper roller guides replaced by hydrostatic guides. The results show that the hydrostatic guides help to reduce the passive force to a constant near zero in contrast with the traditional guides. This also resulted in reduced surface roughness of the stone plates that were cut, indicating a reduction in laterial vibration of the band. Additionally, it has also been shown that using hydrostatic guides the bandsaw blade can be tilted to counter the bandsaw drift, opening opportunities for further research in active alignment control. This original research work has shown that the hydrostatic guide systems are capable of replacing, and in fact, perform better than state-of-the-art bearing or block guides, particularly for stone-cutting applications.

Smart Education Using the Social network Site Facebook a solution for Interactions

2020 ◽  
Author(s):  
shariq aziz butt
Keyword(s):  
Social Network ◽  
Research Work ◽  
Original Research ◽  
Social Network Site ◽  
Network Site ◽  
The Social ◽  
Smart Education

The paper is Original Research work and done by mentioned author in the article.

Active thermography as a tool for internal composite structure observation and evaluation

2018 ◽  
Vol 9 (6) ◽  
pp. 779-792 ◽  
Author(s):  
Katarzyna Majewska ◽  
Magdalena Mieloszyk ◽  
Wieslaw Ostachowicz
Keyword(s):  
Research Work ◽  
Structural Condition ◽  
Original Research ◽  
Pulsed Thermography ◽  
Content Type ◽  
Three Samples ◽  
Structure Observation ◽  
Material Discontinuities ◽  
Excellent Tool ◽  
Composite Samples

Purpose The purpose of this paper is to study if it is possible applying infrared thermography (both vibro and pulsed) to detect and localise material discontinuities as well as to find the place where the inclusion was introduced. Design/methodology/approach The experimental investigation is performed on samples manufactured during infusion process. The measurements were performed on three four-layered rectangular composite samples with discontinuities. The discontinuities introduced in the samples were as follow: all three samples between first and second layer counting form the bottom two optical fibres (OFs) were embedded and additionally: sample no. 1 – one of the OF was broken, sample no. 2 – the drop of water was introduced, and sample no. 3 – the little amount of dust was introduced. Findings For some discontinuities, the vibrothermography is excellent tool (placement of broken OF, drop of water), for same is not sufficient (healthy OFs or dust). For dust, the pulsed thermography seems to be the required tool. Different approaches (vibrothermography and pulsed thermography) for the same sample will confirm that for same defects vibrothermograpy is better and for some pulsed thermography – complex combination of different thermography approaches is needed to have complex response about sample structural condition. Originality/value The presented paper is an original research work. There are very limited literature papers applying both vibro and pulsed thermography for one problem. The assessment of different discontinuities (inclusions) and detailed analysis is presented.

System and neural network analysis of intent to buy and willingness to pay insurance premium

2019 ◽  
Vol 45 (1) ◽  
pp. 147-168 ◽  
Author(s):  
Sanjay Tolani ◽  
Ananth Rao ◽  
Genanew B. Worku ◽  
Mohamed Osman
Keyword(s):  
Neural Network ◽  
Social Security ◽  
Willingness To Pay ◽  
United Arab Emirates ◽  
Middle Eastern ◽  
Country Of Origin ◽  
Research Work ◽  
Original Research ◽  
Content Type ◽  
Social Security Benefits

Purpose The purpose of this paper is to analyze significant determinants to assess the probability of insureds’ intent to buy (ITB) insurance and willingness to pay (WTP) quantum of dollars for security benefits. Design/methodology/approach The authors use the Double Hurdle Model (DHM) and Neural Network (NN) architecture to analyze the insureds’ behavior for ITB and WTP. The authors apply these frameworks to all the 503 insureds of a branch of a leading insurer in the United Arab Emirates. Findings The DHM identified age, loans & liabilities, body mass index, travel outside the UAE, salary and country of origin (Middle Eastern and African) as significant determinants to predict WTP for social security benefits. In addition to these determinants, NN architecture identified insurance replacement, holding multiple citizenship, age of parents, mortgages, country of origin: Americas, length of travel, income of previous year and medical conditions of insured as additional important determinants to predict WTP for social security benefits; thus, NN is found to be superior to DHM due to its lowest RMSE and AIC in the holdout sample and also its flexibility and no assumptions unlike econometric models. Research limitations/implications Insureds’ data used from one UAE Branch limit the generalizability of empirical findings. Practical implications The study findings will enable the insurers to appropriately design the insurance products that match the insurers’ behavior of ITB and WTP for social security benefits. Social implications The study findings have the potential for insurance institutions to be more flexible in their insurance practices through public–private partnerships. Originality/value This is the authors’ original research work.

scholarly journals Ethical Guidelines for Publishing in the Journal of Cachexia, Sarcopenia and Muscle Clinical Reports

2016 ◽  
Vol 1 (1) ◽  
Author(s):  
Stephan Von Haehling ◽  
Nicole Ebner ◽  
John E Morley ◽  
Andrew JS Coats ◽  
Stefan D Anker
Keyword(s):  
Conflicts Of Interest ◽  
Research Work ◽  
Ethics Committees ◽  
Institutional Review Boards ◽  
Original Research ◽  
Ethical Guidelines ◽  
Abstract Form ◽  
Institutional Review ◽  
Ethical Authorship ◽  
Available Information

AbstractThis article details the principles of ethical authorship and publishing in the Journal of Cachexia, Sarcopenia and Muscle Clinical Reports (JCSM Clinical Reports). At the time of submission to JCSM Clinical Reports, the corresponding author, on behalf of all co-authors, needs to certify adherence to these principles. The principles are obtained below: All authors listed on a manuscript considered for publication have approved its submission and (if accepted) publication as provided to JCSM Clinical Reports;No person having a right to be recognized as author has been omitted from the list of authors on the submitted manuscript;The submitted work is original and is neither under consideration elsewhere nor has it been published previously in whole or in part other than in abstract form;All authors certify that the work is original and does not contain excessive overlap with prior or contemporaneous publication elsewhere, and where the publication reports on cohorts, trials, or data that have been reported on before these other publications must be referenced;All original research work are approved by the relevant bodies such as institutional review boards or ethics committees;All conflicts of interest, financial or otherwise, that may affect the authors' ability to present data objectively, and relevant sources of funding have been duly declared in the manuscript;The manuscript in its published form will be maintained on the servers of JCSM Clinical Reports as a valid publication only as long as all statements in the guidelines on ethical publishing remain true; andIf any of the aforementioned statements ceases to be true, the authors have a duty to notify the Editors of JCSM Clinical Reports as soon as possible so that the available information regarding the published article can be updated and/or the manuscript can be withdrawn.

Research on Sealing Performance in High Pressure Oil-Free Miniature Air Compressor

2017 ◽  
Author(s):  
Yipan Deng ◽  
Yinshui Liu ◽  
Fan Li ◽  
Pengyun Tian ◽  
Na Miao
Keyword(s):  
Mathematical Model ◽  
High Pressure ◽  
Pressure Distribution ◽  
Research Work ◽  
Piston Rings ◽  
Premature Failure ◽  
Air Compressor ◽  
Sealing Performance ◽  
Rotary Speed ◽  
Discharge Pressure

High pressure oil-free miniature air compressor has an irreplaceable role in some high demand areas such as cooling, scuba diving and pneumatic catapult due to its remarkable advantages such as compacted size, lightened weight and clean output gas. As the important sealing component in the high pressure oil-free miniature air compressor, piston rings hold the properties such as tiny diameter (less than 10mm), high sealing pressure (up to 410 bar) and high surrounding temperature (up to 500K), which make them distinctive from conventional piston rings. A mathematical model was established to simulate the pressure distribution of the compressor chamber, as well as the gap between the sealing rings. Sensitive parameters were considered to investigate their effects on the sealing performance such as the number and the cut size of the piston rings, the suction and discharge pressure and the rotary speed. The mathematical model was verified by comparing to published experimental research work. These work help to reveal the severe non-uniformity of the pressure distribution of different chambers, which were suggested be the primary cause of the premature failure of the sealing rings, thus improving the sealing performance and the service life of the air compressor.

Toward a University Standard of Medical Education, 1890-1920

1996 ◽  
Author(s):  
Thomas Neville Bonner
Keyword(s):  
Clinical Medicine ◽  
Medical Curriculum ◽  
Research Work ◽  
Western World ◽  
Original Research ◽  
Medical Study ◽  
The Future ◽  
Study Of Medicine ◽  
History Of ◽  
The University

In the waning years of the nineteenth century, despite (or perhaps because of) the inroads of laboratory science, uncertainty still hung heavy over the future shape of the medical curriculum. Although currents of change now flowed freely through the medical schools and conditions of study were shifting in every country, agreement was far from universal on such primary questions as the place of science and the laboratory in medical study, how clinical medicine should best be taught, the best way to prepare for medical study, the order of studies, minimal requirements for practice, and the importance of postgraduate study. “Perturbations and violent readjustments,” an American professor told his audience in 1897, marked the life of every medical school in this “remarkable epoch in the history of medicine.” Similar to the era of change a century before, students were again confronted with bewildering choices. Old questions long thought settled rose in new form. Did the practical study of medicine belong in a university at all? Was bedside instruction still needed by every student in training, or was the superbly conducted clinical demonstration not as good or even better? Should students perform experiments themselves in laboratories so as to understand the real meaning of science and its promise for medicine, or was it a waste of valuable time for the vast majority? And what about the university—now the home of advanced science, original research work, and the scientific laboratory—was it to be the only site to learn the medicine of the future? What about the still numerous hospital and independent schools, the mainstay of teaching in Anglo- America in 1890—did they still have a place in the teaching of medicine? Amidst the often clamorous debates on these and other questions, the teaching enterprise was still shaped by strong national cultural differences. In the final years of the century, the Western world was experiencing a new sense of national identity and pride that ran through developments in science and medicine as well as politics. The strident nationalism and industrial-scientific strength of a united Germany, evident to physicians studying there, thoroughly frightened many in the rest of Europe.

On bio-convection thermal radiation in Darcy – Forchheimer flow of nanofluid with gyrotactic motile microorganism under Wu’s slip over stretching cylinder/plate

2020 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
H. Waqas ◽  
M. Imran ◽  
Taseer Muhammad ◽  
Sadiq M. Sait ◽  
R. Ellahi
Keyword(s):  
Mixed Convection ◽  
Volume Fraction ◽  
Research Work ◽  
Concentration Field ◽  
Second Order ◽  
Original Research ◽  
Stretching Cylinder ◽  
Content Type ◽  
Mixed Convection Parameter ◽  
Convection Parameter

Purpose The purpose of this study is to discuss the Darcy–Forchheimer nanoliquid bio-convection flow by stretching cylinder/plate with modified heat and mass fluxes, activation energy and gyrotactic motile microorganism features. Design/methodology/approach The proposed flow model is based on flow rate, temperature of nanomaterials, volume fraction of nanoparticles and gyrotactic motile microorganisms. Heat and mass transport of nanoliquid is captured by the usage of popular Buongiorno relation, which allows us to evaluate novel characteristics of thermophoresis diffusion and Brownian movement. Additionally, Wu’s slip (second-order slip) mechanisms with double stratification are incorporated. For numerical and graphical results, the built-in bvp4c technique in computational software MATLAB along with shooting technique is used. Findings The influence of key elements is illustrated pictorially. Velocity decays for higher magnitude of first- and second-order velocity slips and bioconvection Rayleigh number. The velocity of fluid has an inverse relation with mixed convection parameter and local inertia coefficient. Temperature field enhances with the increase in estimation of thermal stratification Biot number and radiation parameter. A similar situation for concentration field is observed for mixed convection parameter and concentration relaxation parameter. Microorganism concentration profile decreases for higher values of bioconvection Lewis number and Peclet number. A detail discussion is given to see how the graphical aspects justify the physical ones. Originality/value To the best of the authors’ knowledge, original research work is not yet available in existing literature.

scholarly journals Prologue: 2009 Group for Research and Assessment of Psoriasis and Psoriatic Arthritis (GRAPPA)

2011 ◽  
Vol 38 (3) ◽  
pp. 522-525 ◽  
Author(s):  
PHILIP J. MEASE ◽  
DAFNA D. GLADMAN
Keyword(s):  
Psoriatic Arthritis ◽  
Interdisciplinary Communication ◽  
Research Work ◽  
Training Session ◽  
Future Research ◽  
Original Research ◽  
Genetic Associations ◽  
Biopharmaceutical Company ◽  
Response Measures ◽  
Patient Groups

The 2009 Annual Meeting of the Group for Research and Assessment of Psoriasis and Psoriatic Arthritis (GRAPPA) was held in June 2009 in Stockholm, Sweden, and was attended by rheumatologists, dermatologists, biopharmaceutical company representatives, and patient groups. A primary goal of GRAPPA is to foster outreach and interdisciplinary communication between the fields of rheumatology and dermatology. Several members attended an adjacent meeting of the International Federation of Psoriasis Associations; reports were also provided of recent meetings of the American Academy of Dermatology and the Assessment of SpondyloArthritis (ASAS) working group. In a training session of the GRAPPA meeting, members served as faculty while rheumatology fellows and dermatology residents presented original research work. In one module of the meeting, several response measures were discussed. In another module, discussions were held on the need for dermatologists to be able to diagnose psoriatic arthritis (PsA) among their psoriasis patients; several PsA screening questionnaires were presented, and progress was reported on developing online training videos as an aid to educate clinicians in their diagnoses. Other topics for discussion at the GRAPPA meeting included presentations on genetic associations with PsA and on comorbidities in patients with PsA. Current and future research projects also were outlined.

Characterization of the mechanical behaviour of wooden construction materials from “quinta lobeira de cima”

2018 ◽  
Vol 9 (3) ◽  
pp. 396-410 ◽  
Author(s):  
Patricia Raposo ◽  
João Martins ◽  
José Correia ◽  
Maria E. Salavessa ◽  
Cristina Reis ◽  
...  
Keyword(s):  
Twentieth Century ◽  
Mechanical Behaviour ◽  
Research Work ◽  
Construction Materials ◽  
Image Correlation ◽  
Original Research ◽  
Content Type ◽  
Cultural Patrimony ◽  
Master Thesis ◽  
Longitudinal Modulus

Purpose The antique structures are part of the inheritance that our elders left, being important to preserve their memories. It is important to preserve, rehabilitate and restore the historic buildings protecting the cultural patrimony, attending to the actual comfort and habitability requirements. It is necessary to study the behaviour of the various elements that compose antique structures (masonry and wood) in order to develop assessment measures according to the characteristics of the original materials. The paper aims to discuss these issues. Design/methodology/approach An experimental campaign to characterize the mechanical behaviour of the wood of the roof of the “sequeiro” of “Quinta Lobeira de Cima”, a building from the twentieth century located in Minho, was carried out. The tested wood specimens are from two different species: chestnut and oak. Compression, tension and static flexion tests according to parallel to the grain direction were performed. Other parameters, such as density, moisture content and longitudinal modulus of elasticity in compression and in tension, were also obtained. The measurement of displacements was made with Digital Image Correlation (DIC). Findings The results of this study show the similarity between experimental and empirical values for the studied woods species. Originality/value This original study aimed at characterizing the mechanical properties using DIC of wood of the roof of the “sequeiro” of “Quinta Lobeira de Cima”, a building from the twentieth century located in Minho (Portugal). This study is part of master thesis of João Martins, an original research work.

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