bluuebunny/crossref_metadata_2025_split huggingface dataset:
The History of the Chronometer
Authors: Betts Jonathan 
Published: December 2017

Abstract
A newly researched history of the marine chronometer, from its earliest origins in the 17th century through to electronic instruments manufactured in the late 20th century. The narrative is written in a style intended to be interesting and accessible to readers outside the horological profession and technical matters are explained and illustrated in the simplest possible terms. The seminal contribution by clockmaker John Harrison (1693-1776) is newly assessed and discussed and the importance of the pioneers who developed marine timekeepers before and after Harrison’s break-though is emphasised and explained. The international context within which the chronometer evolved is discussed, and the contributions of nations other than Britain and France are included. This history follows on from the great work by R.T.Gould, The Marine Chronometer, its History and Development (1923), but brings the narrative up to date, whilst also adding the results of much further research, carried out since Gould’s time.
Cerebral Abscesses and Osteomyelitis Caused by Fish Bone Impaction on FDG PET/CT Imaging
Authors: Zhang Gui-Xiong , Jiang Ting , Mao Yong-Jiang , Yang Min , Xu Jie-Hua 
Published: December 2017

Abstract
A 50-year-old woman complained postprandial vomiting for 5 days and drowsiness for 3 days. Possible central nervous pathology was suspected clinically. Brain MRI suggested likely brain metastases. For this reason, FDG PET/CT was performed to search the primary malignancy. The images showed abnormal activity not only in the brain, but also in the retropharyngeal region and in the thoracic vertebral body. The lesions were eventually confirmed as infection caused by fish bone impaction that occurred 1 month earlier.
Analysis of Bone Healing with a Novel Bone Wax Substitute Compared to Bone Wax in a Porcine Bone Defect Model
Authors: Tham Tristan , Roberts Keith , Shanahan John , Burban John , Costantino Peter 
Published: December 2017

AbstractBackgroundBone wax is used in surgery as a hemostatic device for bone. Despite its good functional capacity as a bone hemostat, Bone wax materials often have very poor long-term interactions with bone. This study describes a novel composite of hydroxyapatite (HA) and biodegradable poly-lactic acid (PLA) with wax-like handling properties (OsteoStat). The goal was to compare qualitative and quantitative measures between OsteoStat versus Bone wax.MethodsThe porcine critical size defect model was chosen in this study. OsteoStat and Bone wax were introduced into separate critical size defects located in the femur and humerus of a single porcine specimen. After a duration of 6 weeks, the defect sites were harvested for clinical, histological, and histomorphometric analysis.ResultsBoth groups had effective hemostatic action when introduced into the defects. Analysis of the histomorphometric data revealed that the amount of new bone was significantly greater at 6 weeks in the OsteoStat group (38.05%) versus the Bone wax group (11.88%), p=0.028. OsteoStat also demonstrated less soft tissue and less test material remaining in the defect sites; however, this was not statistically significant.ConclusionsWe speculate that the incomplete biodegradation of Bone wax as well as its intrinsic inflammatory properties may have retarded osseous regeneration and promoted fibrosis. In contrast, well known biodegradation pathways for PLA combined with the HA component of OsteoStat may have accounted for the positive results of OsteoStat compared to Bone wax. It is important that bone hemostat substances have biocompatible, osteoconductive, hemostatic, as well as good handling properties.
A Grey-DEMATEL approach for implicating e-waste management practice
Authors: Sahu Atul Kumar , Narang Harendra Kumar , Rajput Mridul Singh 
Published: December 2017

Purpose
The use of smart electronic gadgets is proportionately increased during last decades as these gadgets are crafting coziness and relief to the society by making their work easier, effective, etc. These gadgets are the need of today’s working environment for effective planning and work execution. Today, people pertaining to almost every corner of the world are addicted to smart mobile phones, and nowadays, these mobile handsets have become very essential and it is not possible to survive without using them. On the other hand, these smart mobile handsets become inefficient and obsolete over time due to which there is a need to replace the old phones by the new ones, thus creating e-waste. The purpose of this paper is to recognize the significant enablers which are responsible for replacing the existing working mobile phones with the new ones by the end consumers.

Design/methodology/approach
The Grey-DEMATEL (Decision-Making Trial and Evaluation Laboratory) approach is proposed by the authors to compute the decision results. The present work is supported by the structural modeling equations for supporting sustainability throughout and recognizes the most significant enablers responsible for creating e-waste by replacing the working mobile phones with the new ones.

Findings
The implication for reducing e-waste using a qualitative approach is presented by easy computation steps for collaborating green issues in the present work. The authors explained numerous enablers, which are responsible for handsets replacement by the consumers. The work can aid the companies as well as the government legislations to identify the significant enablers, drivers, factors, attributes, etc., in moving toward green environmental issue; the generation of e-waste by the obsolete existing working handsets due to non-identification of deficient enablers can be insignificant to the society.

Research limitations/implications
The implication of developed Grey-DEMATEL techniques is presented by its integration with the application field of e-waste generation by mobile handsets. The authors attempt to devise a conceptual framework linked with knowledge-based theory. The work is illustrated by the case research to understand its applicability and validity in the present scenario.

Originality/value
The authors attempt to propose a decision model, which will aid in identifying the most significant factorial condition responsible for replacing the existing mobile phones with the new ones by the end consumers. The proposed appraisement module can be used as an investigative tool to build and fabricate a planned environmental progress map for overall business considering environmental domain by the companies.
Measuring electronic service quality in India using E-S-QUAL
Authors: Ghosh Manimay 
Published: December 2017

Purpose
The purpose of this paper is to examine the applicability of electronic service quality instrument, E-S-QUAL, in e-commerce industry in India. Additionally, the efficacy of the instrument is also examined for two sub-groups of users based on frequency of usage.

Design/methodology/approach
Field research was conducted with a modified version of the instrument. The data collected were analyzed using multivariate techniques.

Findings
The study confirms the validity of the four dimensions (efficiency, fulfillment, system availability, and privacy) of E-S-QUAL instrument. All four dimensions were found to be significant predictors of perceived value. Efficiency and fulfillment were significant predictors of overall perceived quality. Perceived value had a positive and significant relationship with loyalty. The two relationships were further examined for two sub-groups of web users based on the frequency of usage. For heavy users of websites, all four dimensions were significant predictors of perceived value. For predicting perceived value in respect of light users of website, efficiency, fulfillment, and privacy were important determinants. The relationships among latent constructs were checked using structural equation modeling and the model was found to be acceptable. The result showed that electronic service quality affected perceived value, which, in turn, affected loyalty toward a website.

Originality/value
This paper makes an attempt to replicate the four dimensions structure of E-S-QUAL instrument on online shopping sites in India thus enhancing its external generalizability. Additionally, the paper investigates the association of the four aforesaid dimensions with perceived value and overall perceived quality for two sub-groups of users: frequent and non-frequent. The cornerstone of this particular study is to examine the frequency of usage as deterministic parameter for perceived value and overall perceived quality.
Fluid flow modeling of a four-stage damping adjustable shock absorber and its experimental research
Authors: Ding Erming , Xie Fangwei , Dai Heng , Gao Qingsong , Zhang Jin , Feng Yixian , Liu Hongtuo 
Published: December 2017

Purpose
In order to improve the ride comfort of vehicle suspension, this paper first proposed a shock absorber with four-stage adjustable damping forces. The purpose of this paper is to validate its modeling and characteristics, indicator diagrams and velocity diagrams, which are the main research points.

Design/methodology/approach
In order to validate the fluid flow modeling, a series of mathematical modeling is established and solved by using Matlab/Simulink. An experiment rig based on electro-hydraulic loading servo system is designed to test the prototype. Finally, indicator diagram and velocity diagram are obtained and compared both in simulation and experiments.

Findings
Results indicate that at the same damping position, damping force will increase with the rise of rod’s velocity: if the rod’s velocity is fixed, the damping force changes apparently by altering the damping position. The shock absorber is softest at damping position 1, and it is hardest at damping position 4; although there is no any badly empty stroke and skewness in indicator diagram by simulation, a temporary empty stroke happens at maximum displacement of piston rob, both in rebound and compression strokes.

Research limitations/implications
Compared with results of the simulation and experiments, the design of a four-stage damping adjustable shock absorber (FDASA) is validated correctly in application, and may improve the overall dynamic performance of vehicle.

Originality/value
This paper is mainly focused on the design and testing of an FDASA, which may obtain four-stages damping characteristics, that totally has a vital importance to improve the performance of vehicle suspension.
Experimental determination of fire degradation kinetic for an aeronautical polymer composite material
Authors: Grange Nathan , Tadini Pietro , Chetehouna Khaled , Gascoin Nicolas , Bouchez Guillaume , Senave Samuel , Reynaud Isabelle 
Published: December 2017

Purpose
The purpose of this paper is to evaluate the fire resistance of an innovative carbon-reinforced PEKK composite for aeronautical applications. To this end, thermal degradation analysis under inert and oxidative atmosphere is carried out. Moreover, a linear model fitting approach is compared to a generally used isoconversional method to validate its reliability for kinetic triplet estimation.

Design/methodology/approach
Thermogravimetric analysis carried out under inert and oxidative atmospheres, between 25 and 1000°C for three different heating rates (5, 15, 25°C/min), followed by a qualitative SEM observation of the samples before and after thermal treatment. After the reaction identification by TG/DTG curves, an isoconversional analysis is carried out to estimate the activation energy as a function of the reaction conversion rate. For the identified reactions, the kinetic triplet is estimated by different methods and the results are compared to evaluate their reliability.

Findings
In inert case, one global reaction, observed between 500-700°C, seems able to describe the degradation of carbon-PEKK resin. Under oxidative atmosphere, three main reactions are identified, besides the resin degradation, the other two are attributed to char and fiber oxidation. Good agreement achieved between isoconversional and linear model fitting methods in activation energy calculation. The achieved results demonstrate the high thermal resistance of PEKK associated with the ether and ketone bonds between the three aromatic groups of its monomer.

Originality/value
This paper provides a possible degradation model useful for numerical implementation in CFD calculations for aircraft components design, when exposed to high temperatures and fire conditions.
Predicting student academic performance using multi-model heterogeneous ensemble approach
Authors: Adejo Olugbenga Wilson , Connolly Thomas 
Published: December 2017

Purpose
The purpose of this paper is to empirically investigate and compare the use of multiple data sources, different classifiers and ensembles of classifiers technique in predicting student academic performance. The study will compare the performance and efficiency of ensemble techniques that make use of different combination of data sources with that of base classifiers with single data source.

Design/methodology/approach
Using a quantitative research methodology, data samples of 141 learners enrolled in the University of the West of Scotland were extracted from the institution’s databases and also collected through survey questionnaire. The research focused on three data sources: student record system, learning management system and survey, and also used three state-of-art data mining classifiers, namely, decision tree, artificial neural network and support vector machine for the modeling. In addition, the ensembles of these base classifiers were used in the student performance prediction and the performances of the seven different models developed were compared using six different evaluation metrics.

Findings
The results show that the approach of using multiple data sources along with heterogeneous ensemble techniques is very efficient and accurate in prediction of student performance as well as help in proper identification of student at risk of attrition.

Practical implications
The approach proposed in this study will help the educational administrators and policy makers working within educational sector in the development of new policies and curriculum on higher education that are relevant to student retention. In addition, the general implications of this research to practice is its ability to accurately help in early identification of students at risk of dropping out of HE from the combination of data sources so that necessary support and intervention can be provided.

Originality/value
The research empirically investigated and compared the performance accuracy and efficiency of single classifiers and ensemble of classifiers that make use of single and multiple data sources. The study has developed a novel hybrid model that can be used for predicting student performance that is high in accuracy and efficient in performance. Generally, this research study advances the understanding of the application of ensemble techniques to predicting student performance using learner data and has successfully addressed these fundamental questions: What combination of variables will accurately predict student academic performance? What is the potential of the use of stacking ensemble techniques in accurately predicting student academic performance?
Thermodynamical interactions in a two-temperature dual-phase-lag micropolar thermoelasticity with gravity
Authors: Deswal Sunita , Punia Baljit Singh , Kalkal Kapil Kumar 
Published: December 2017

Purpose
The dual-phase-lag (DPL) model is applied to study the effect of the gravity field and micropolarity on the wave propagation in a two-temperature generalized thermoelastic problem for a medium. The paper aims to discuss this issue.

Design/methodology/approach
The exact expressions of the considered variables are obtained by using normal mode analysis.

Findings
Numerical results for the field quantities are given in the physical domain and illustrated graphically to show the effect of angle of inclination. Comparisons of the physical quantities are also shown in figure to study the effect of gravity and two-temperature parameter.

Originality/value
This paper is concerned with the analysis of transient wave phenomena in a micropolar thermoelastic half-space subjected to inclined load. The governing equations are formulated in the context of two-temperature generalized thermoelasticity theory with DPLs. A medium is assumed to be initially quiescent and under the effect of gravity. An analytical solution of the problem is obtained by employing normal mode analysis. Numerical estimates of displacement, stresses and temperatures are computed for magnesium crystal-like material and are illustrated graphically. Comparisons of the physical quantities are shown in figures to study the effects of gravity, two-temperature parameter and angle of inclination. Some particular cases of interest have also been inferred from the present problem.
A critical reflexive perspective on othering in collaborative knowledge production
Authors: Nordentoft Helle Merete , Olesen Birgitte Ravn 
Published: December 2017

Purpose
The purpose of the paper is to show power mechanisms of in- and exclusion in moments where certain participants appeared to be othered in two collaborative research and development projects in a healthcare setting.

Design/methodology/approach
The paper contributes to critical-reflexive analyses of reflexive processes within collaborative knowledge production. The authors use an analytical framework combining Bakhtin and Foucault to investigate processes of inclusion and exclusion in the interplay between dominant and subordinated voices in a moment-by-moment analysis of two incidents from interdisciplinary workshops.

Findings
The analysis illuminates how differences between voices challenge participants’ reflexive awareness and lead to the reproduction of contextual power and knowledge hierarchies and the concomitant silencing of particular participants. Thus, the findings draw attention to the complex and ethical nature of collaborative knowledge production.

Practical implications
To invite researchers to be reflexive about the complex, situated and emergent character of reflexive processes and consider ethics to be a critical stance that encourages continuous reflection and critique of collaborative knowledge production.

Originality/value
To show the importance of not sweeping incidents in which participants are othered “under the carpet” in collaborative research. To present an analytical framework for analysing the contextual and emergent nature of collaborative research processes and discuss the ethical conundrums, which arise in the research process.
A year in the life of a thrombolite: comparative metatranscriptomics reveals dynamic metabolic changes over diel and seasonal cycles
Authors: Louyakis Artemis S. , Gourlé Hadrien , Casaburi Giorgio , Bonjawo Rachelle M. E. , Duscher Alexandrea A. , Foster Jamie S. 
Published: December 2017

SummaryMicrobialites are one of the oldest known ecosystems on Earth and the coordinated metabolisms and activities of these mineral‐depositing communities have had a profound impact on the habitability of the planet. Despite efforts to understand the diversity and metabolic potential of these systems, there has not been a systematic molecular analysis of the transcriptional changes that occur within a living microbialite over time. In this study, we generated metatranscriptomic libraries from actively growing thrombolites, a type of microbialite, throughout diel and seasonal cycles and observed dynamic shifts in the population and metabolic transcriptional activity. The most transcribed genes in all seasons were associated with photosynthesis, but only transcripts associated with photosystem II exhibited diel cycling. Photosystem I transcripts were constitutively expressed at all time points including midnight and sunrise. Transcripts associated with nitrogen fixation, methanogenesis and dissimilatory sulfate reduction exhibited diel cycling, and variability between seasons. Networking analysis of the metatranscriptomes showed correlated expression patterns helping to elucidate how metabolic interactions are coordinated within the thrombolite community. These findings have identified distinctive temporal patterns within the thrombolites and will serve an important foundation to understand the mechanisms by which these communities form and respond to changes in their environment.
Testing top‐down and bottom‐up effects on arid zone beetle assemblages following mammal reintroduction
Authors: Gibb Heloise , Verdon Simon J. , Weir Tom , Johansson Therese , L'Hotellier Felicity , Hayward Matthew W. 
Published: December 2017

AbstractSpecies extinctions and declines are occurring globally and commonly have cascading effects on ecosystems. In Australia, mammal extinctions have been extensive, particularly in arid areas, where precipitation drives ecosystems. Many ecologically extinct mammals feed on soil‐dwelling insects. However, how this top‐down pressure affected their prey and how this contrasts with the bottom‐up impacts of fluctuating precipitation remains unclear. We constructed a long‐term exclusion experiment in a multi‐species mammal reintroduction zone in semi‐arid Australia to test how top‐down (reintroduced mammals) and bottom‐up (precipitation) factors affect root‐feeding chafer beetles (Coleoptera: Melolonthinae). We used emergence traps in ten replicate 20 × 20 m plots of control, exclusion and procedural control treatments to trap chafers biannually from 2009 to 2015. Annual precipitation during this period varied from 173 to 481 mm. Mammal exclusion did not affect chafers, indicating that top‐down regulation was not important. Instead, chafer abundance, species density and biomass increased with precipitation. Chafer body size and assemblage composition were best predicted by sampling year, suggesting that random drift determined species abundances. Increased resource availability therefore favoured all species similarly. We thus found no evidence that mammal predation alters chafer populations and conclude that they may be driven primarily by bottom‐up processes. Further research should determine if the cascading effects of species loss are less important for herbivores generally than for higher level trophic groups and the role of ecosystem stability in mediating these patterns.