bluuebunny/crossref_metadata_2025_split huggingface dataset:
Microcystis aeruginosagrown in different defined media leads to different cultivable heterotrophic bacteria composition that could influence cyanobacterial morphological characteristics and growth properties
Authors: Khong Nicholas M.H. , Khaw Yam Sim , Nazarudin Muhammad Farhan , Yusoff Fatimah Md. 
Published: July 2019

AbstractCyanobacterial blooms involvingMicrocystisspp. often pose severe problems to the environment and general community due to their persistent presence in eutrophic water bodies and potential to form blooms. Bacterial associations are known to alter microenvironment ofMicrocystisand potentially influence their development. This study aimed to study cultivable heterotrophic bacteria composition that developed symbiotically withMicrocystis aeruginosanaturally as well as those cultured under defined media and their possible effects on the morphology and growth properties of the cyanobacterium.M. aeruginosa(UPMC-A0051) was isolated during a bloom from Putrajaya Lake, Malaysia and characterized as a non microcystin-producing cyanobacterium using PCR and chromatographic methods. Associated heterotrophic bacteria were then isolated and identified from the culture media as well as the lake where the cyanobacterium was originally isolated. A total of 16 bacterial species were isolated from the lake and none of them were similar to the bacteria associated withM. aeruginosacultured in artificial media. Cultivable heterotrophic bacteria composition associated withM. aeruginosawere also distinct in different culture media, despite the same inoculum. These bacteria were classified underActinobacteria, α.-Proteobacteriaandβ-Proteobacteria. Under different bacterial associations,M. aeruginosacultivated in defined media showed different colony morphology and growth properties. The present study demonstrated that distinct bacterial composition observed in different culture media could be responsible for dissimilar cyanobacterium morphology and growth rate, particularly on the clustering pattern. In the axenic culture, the growth ofM. aeruginosawas significantly reduced indicating the influence of associated bacteria on the development of cyanobacterial colonies.
Combination classification method for customer relationship management
Authors: Zhang Zhe , Dai Yue 
Published: July 2019

Purpose
For classification problems of customer relationship management (CRM), the purpose of this paper is to propose a method with interpretability of the classification results that combines multiple decision trees based on a genetic algorithm.

Design/methodology/approach
In the proposed method, multiple decision trees are combined in parallel. Subsequently, a genetic algorithm is used to optimize the weight matrix in the combination algorithm.

Findings
The method is applied to customer credit rating assessment and customer response behavior pattern recognition. The results demonstrate that compared to a single decision tree, the proposed combination method improves the predictive accuracy and optimizes the classification rules, while maintaining interpretability of the classification results.

Originality/value
The findings of this study contribute to research methodologies in CRM. It specifically focuses on a new method with interpretability by combining multiple decision trees based on genetic algorithms for customer classification.
Understanding the impacts of issue types and employee–organization relationships on employees’ problem perceptions and communicative behaviors
Authors: Lee Yeunjae , Kim Katie Haejung , Kim Jeong-Nam 
Published: July 2019

Purpose
The purpose of this paper is to examine the impact of different types of corporate issues and employee–organization relationships (EORs) on employees’ perceptions of the issues and on their communicative actions. Specifically, this study investigates how employees who have experienced an internal or an external issue within their organizations differently perceive the organizational issue and engage in positive and/or negative communicative behaviors.

Design/methodology/approach
An online survey was conducted with 363 full-time employees in large-sized companies in the USA who have experienced any internal or external issues within the past six months.

Findings
Employees are more cognitively aware of and feel more involved and less constrained in solving an internal company issue than an external one. Experiencing internal issues has led employees to share negative information about their organization externally. The quality of EORs pre-issue significantly increases employees’ involvement and positive communication behavior and decreases constraint levels and negative communication behaviors regarding an issue.

Practical implications
Corporate communication and public relations practitioners should incorporate strategic internal communication strategies to preemptively manage internal issues and to avoid them from evolving into internal crises.

Originality/value
This study is among the first to distinguish internal and external issues perceived by internal stakeholders and to examine their impacts on employees’ issue-specific perceptions and communicative behaviors. This study also provides significant practical guidelines for corporate communication practitioners and leaders by explicating the strategic role of issue type and employee behaviors in issue management.
Numerical simulation and experiment for study on internal flow pattern of vortex pump
Authors: Quan Hui , Chai Yi , Li Rennian , Guo Jianhui 
Published: July 2019

PurposeThe special structure of the vortex pump contributes to its complex internal flow pattern. A type of horizontal 150WX-200-20 vortex pump is taken as a research subject to deeply study the progression and distribution of flow pattern in its channel. To explain the mechanism of flow in this pump, numerical analysis of the whole flow and experiment have been conducted.Design/methodology/approachThe authors studied and analyzed the distribution and evolution of flow pattern under different flow, such as circulating-flow, through-flow and other forms. Finally, a model of flow pattern in the vortex pump has been built, which has more perfectly fit the reality.FindingsThey are through-flow affected by circulating-flow, main and subsidiary circulating-flow, vortices between vanes and other vortices (or liquid impingement) in volute. Entering the pump, part of the flow stays in vanes and turn into vortices while the other goes into the front chamber. The flow that runs into the front chamber will be divided into two parts. One part will be collected by viscosity into a vortex rope when it passing through the interface between the impeller and the vaneless chamber, which closely relates to the circulating-flow, and the rest directly goes out of the field through the diffuser. Besides, a fraction of circulating-flow joins the through-flow when it goes through the section V and leaves the pump.Originality/valueThe research results build a theoretical foundation for working out the flow mechanism of the vortex pump, improving its efficiency and optimizing its hydraulic design.
The challenges of adopting new engineering contract: a Hong Kong study
Authors: Lau Chung Him , Mesthrige Jayantha Wadu , Lam Patrick T.I. , Javed Arshad Ali 
Published: July 2019

Purpose
Project delays and cost over-runs are few common major problems arising from conventional contracts. To overcome these issues, the Hong Kong Government has been practicing the use of the New Engineering Contract (NEC) forms in several public works projects. However, despite the successful outcomes and the positive signs of adopting NEC, it appears that NEC forms of contracts are not widely adopted in the Hong Kong construction industry even after 25 years of their first introduction. The purpose of this paper is to identify the challenges and barriers for not implementing NEC widely in Hong Kong.

Design/methodology/approach
Based on a questionnaire survey data collected from 45 senior industry professionals, and six semi-structured interviews, the study evaluated the perceptions of construction professionals as to why NEC is still not popular in the industry and reported the relative importance of challenges in the implementation of NEC in Hong Kong.

Findings
The results reveal that “People are not willing to change,” “Limited number of trained professionals” and “Insufficient case law and adjudication experience” are the most significant challenges and barriers in adopting NEC. These findings are also supported by the opinions of construction professionals through semi-structured interviews.

Practical implications
The findings are relevant and would benefit to the industry stakeholders for adopting NEC contracts by informing them of the most significant challenges so that proper strategies may be devised to overcoming them for early contractors’ involvement, controlling cost and time overruns in infrastructure projects.

Originality/value
The empirical evidence of the study provides an insight into the challenges faced by the construction industry of Hong Kong. NEC form of contract is the way forward in order to create a better working environment conducive for all the parties that would result in better construction project performance and productivity.
The importance of BIM capability assessment
Authors: Mahamadu Abdul-Majeed , Manu Patrick , Mahdjoubi Lamine , Booth Colin , Aigbavboa Clinton , Abanda F.H. 
Published: July 2019

Purpose
The emergence of building information modelling (BIM) has led to the need for pre-qualification and selection of organisations capable of working within a BIM environment. Several criteria have been proposed for the assessment of an organisation’s BIM capability during the pre-qualification and selection phase of projects. However, no studies have sought to empirically establish whether organisations selected on the basis of such criteria have actually been the most successful at delivering BIM on projects. The purpose of this paper is to address the aforementioned gap through a comparison of predicted BIM capability and post-selection performance.

Design/methodology/approach
BIM capability of firms in a case study was predicted using 28 BIM pre-qualification and selection criteria, prioritised based on their perceived contribution to BIM delivery success from a survey of practitioners on BIM-enabled projects. The comparison of predicted BIM capability and post-selection performance was, on the other hand, achieved through the application of the Technique to Order Preference by Similarity to Ideal Solution and fuzzy sets theory (Fuzzy-TOPSIS).

Findings
Findings underscore the reliability of the 28 BIM pre-qualification and selection criteria as well as the priority weightings proposed for their use in predicting BIM capability and likelihood of performance. The findings have highlighted the importance of criteria related as previous BIM use experience as well as information processing maturity as critical indicators of the capability of organisations, particularly design firms.

Originality/value
Overall, the findings highlight the need for prioritisation of BIM pre-qualification and selection criteria on the basis of their actual contribution to delivery success from post-selection evaluation of performance.
Convergence and error analysis of an automatically differentiated finite volume based heat conduction code
Authors: DeGroot Christopher 
Published: July 2019

Purpose
This paper aims to investigate the convergence and error properties of a finite volume-based heat conduction code that uses automatic differentiation to evaluate derivatives of solutions outputs with respect to arbitrary solution input(s). A problem involving conduction in a plane wall with convection at its surfaces is used as a test problem, as it has an analytical solution, and the error can be evaluated directly.

Design/methodology/approach
The finite volume method is used to discretize the transient heat diffusion equation with constant thermophysical properties. The discretized problem is then linearized, which results in two linear systems; one for the primary solution field and one for the secondary field, representing the derivative of the primary field with respect to the selected input(s). Derivatives required in the formation of the secondary linear system are obtained by automatic differentiation using an operator overloading and templating approach in C++.

Findings
The temporal and spatial discretization error for the derivative solution follows the same order of accuracy as the primary solution. Second-order accuracy of the spatial and temporal discretization schemes is confirmed for both primary and secondary problems using both orthogonal and non-orthogonal grids. However, it has been found that for non-orthogonal cases, there is a limit to the error reduction, which is concluded to be a result of errors in the Gauss-based gradient reconstruction method.

Originality/value
The convergence and error properties of derivative solutions obtained by forward mode automatic differentiation of finite volume-based codes have not been previously investigated.
The numerical modeling of cell freezing in binary solution under subcooling conditions
Authors: Smakulski Przemysław , Pietrowicz Sławomir , Ishimoto Jun 
Published: July 2019

Purpose
This paper aims to describe and investigate the mathematical models and numerical modeling of how a cell membrane is affected by a transient ice freezing front combined with the influence of thermal fluctuations and anisotropy.

Design/methodology/approach
The study consists of mathematical modeling, validation with an analytical solution, and shows the influence of thermal noises on phase front dynamics and how it influences the freezing process of a single red blood cell. The numerical calculation has been modeled in the framework of the phase field method with a Cahn–Hilliard formulation of a free energy functional.

Findings
The results show an influence scale on directional phase front propagation dynamics and how significant are stochastic thermal noises in micro-scale freezing.

Originality/value
The numerical calculation has modeled in the framework of the phase field method with a Cahn–Hilliard formulation of a free energy functional.
Critical events in the tourism industry: factors affecting the future intention to take a cruise
Authors: Penco Lara , Profumo Giorgia , Remondino Marco , Bruzzi Carolina 
Published: July 2019

PurposeIn recent years, critical events have heavily affected the cruise industry. Such events may variously influence customers’ intention to take a cruise in the future depending on different factors. This paper aims to study such factors, in particular the emotions related to the event, the prior corporate reputation and the use of social media in the corporate communication strategies followed during the crisis.Design/methodology/approachThe study is based on the development of a structured questionnaire submitted online via blogs and other social media. Overall, 572 cruiser opinions were used to test five research hypotheses by performing logistic regression analysis.FindingsThe degree of anger increases the likelihood of a critical event influencing the intention to take a cruise in the future. On the contrary, a former excellent corporate reputation reduces that likelihood and the high importance placed by potential customers on information about the critical event transmitted via social media does not have any influence.Practical implicationsThe study has several managerial implications, as it identifies and analyses the variables cruise company managers should consider when dealing with critical events.Originality/valueDespite the relevance of this topic, no studies have yet focused on how (and by which factors) a critical event may influence customers’ intention to take a cruise in the future.
Making good suggestions in analytics-based early alert systems
Authors: Foung Dennis 
Published: July 2019

Purpose
The purpose of this paper is to answer the following questions: On which early alert system suggestions are students more likely to act? What factors drive students’ decisions to act on early alert system recommendations?

Design/methodology/approach
This study examined whether students’ behaviour changed after receiving the results of an early alert system (CDR). In the middle of a semester, 423 students with varying levels of English proficiency were invited to try the CDR and complete a questionnaire that asked about their perception of the tool and whether they planned to act on the recommendations they received.

Findings
Results suggested that students mainly planned to take the assessment-related recommendations provided through the CDR to improve their assessment performance. Results also suggested that student anxiety and student ability affected the likelihood that students would act on the recommendations.

Practical implications
These findings provide useful insights for early alert system designers to establish a system that generates useful recommendations for students.

Originality/value
The findings of this study contribute to the development of early alert systems. Designers can now realise what suggestions can be effectively offered to students.
Authoritarian leadership, organizational citizenship behavior, and organizational deviance
Authors: Ahmad Bodla Ali , Tang Ningyu , Van Dick Rolf , Mir Usman Riaz 
Published: July 2019

PurposeThe purpose of this paper is to examine the relationships between authoritarian leadership, organizational citizenship behavior toward one’s supervisor (OCBS) and organizational deviance. The authors hypothesized curvilinear relationships between authoritarian leadership and OCBS, and between authoritarian leadership and organizational deviance.Design/methodology/approachThe authors analyzed two-source survey data of 240 employee–supervisor dyads collected from seven organizations in Pakistan.FindingsEmployees exhibited most OCBS and least organizational deviance at intermediate levels of authoritarian leadership. Employees’ perception of a benevolent climate at work moderated the curvilinear relations.Research limitations/implicationsThe authors cannot draw causal inferences because of cross-sectional data. Furthermore, the authors’ results may be limited to cultures with high collectivism and high power distance.Practical implicationsThis study envisions and illuminates a new avenue of curvilinear relationships among authoritarian leadership, OCBS and organizational deviance.Originality/valueThe two sources (employee–supervisor dyads) data collected from seven organizations supported a unique curvilinear relationship between authoritarian leadership, OCBS and organizational deviance.
Dietary habits in Japanese patients with psoriasis and psoriatic arthritis: Low intake of meat in psoriasis and high intake of vitamin A in psoriatic arthritis
Authors: Yamashita Hiroko , Morita Takashi , Ito Michiko , Okazaki Shizuka , Koto Mototaka , Ichikawa Yuri , Takayama Ryoko , Hoashi Toshihiko , Saeki Hidehisa , Kanda Naoko 
Published: July 2019

AbstractPsoriasis is characterized by T‐helper 17 cell‐dominant abnormal immunity, and hyperproliferation and abnormal differentiation of epidermal keratinocytes. Some patients are associated with arthritis. Dietary habits can modulate the pathogenesis of psoriasis. Previous studies in Western countries showed higher body mass indices, higher intake of fat and lower intake of fish or vegetables in psoriatic patients compared with the reference groups. We evaluated dietary habits in adult Japanese psoriatic patients, using a validated brief‐type self‐administered dietary history questionnaire, and compared the results to those of age‐ and sex‐matched healthy controls. The results in psoriatic patients with arthritis were compared with those in the patients without. Japanese psoriatic patients showed higher body mass indices, higher intake of fish/shellfish, pulses, sugar/sweeteners, vitamin B12 and vitamin D, and lower intake of meat, compared with those of healthy controls. The logistic regression analysis showed that psoriasis was associated with high body mass index and low intake of meat. The intake of confection in patients with high Psoriasis Area and Severity Index was higher than that in those with low index. The intake of β‐carotene, vitamin A and green/yellow vegetables in psoriatic patients with arthritis were higher than those in the patients without. The dietary habits in Japanese psoriatic patients are rather different from those in Western patients. This is the first study showing the differences in dietary habits between psoriatic patients with arthritis and those without. Further studies should elucidate the relationships of these results with skin and joint lesions in psoriatic patients.
S‐wave in 2D acoustic transversely isotropic media with a tilted symmetry axis
Authors: Jin S. , Stovas A. 
Published: July 2019

ABSTRACTIn an acoustic transversely isotropic medium, there are two waves that propagate. One is the P‐wave and another one is the S‐wave (also known as S‐wave artefact). This paper is devoted to analyse the S‐wave in two‐dimensional acoustic transversely isotropic media with a tilted symmetry axis. We derive the S‐wave slowness surface and traveltime function in a homogeneous acoustic transversely isotropic medium with a tilted symmetry axis. The S‐wave traveltime approximations in acoustic transversely isotropic media with a tilted symmetry axis can be mapped from the counterparts for acoustic transversely isotropic media with a vertical symmetry axis. We consider a layered two‐dimensional acoustic transversely isotropic medium with a tilted symmetry axis to analyse the S‐wave moveout. We also illustrate the behaviour of the moveout for reflected S‐wave and converted waves.
Nitrogen deposition magnifies the sensitivity of desert steppe plant communities to large changes in precipitation
Authors: Ma Quanhui , Liu Xiaodi , Li Yibo , Li Lang , Yu Hongying , Qi Miao , Zhou Guangsheng , Xu Zhenzhu 
Published: July 2019

Abstract

Precipitation alteration and nitrogen (N) deposition caused by anthropogenic activities could profoundly affect the structure and functioning of plant communities in arid ecosystems. However, the plant community impacts conferred by large temporal changes in precipitation, especially with a concurrent increase in N deposition, remain unclear.

To address this uncertainty, from 2016 to 2017, an in situ field experiment was conducted to examine the effects of five precipitation levels, two N levels and their interaction on the plant community function and composition in a desert steppe in northern China.

Above‐ground net primary production (ANPP) and plant community‐weighted mean (CWM) height significantly increased with increasing precipitation, and both were well fitted with a positive linear model, but with a higher slope under N addition. The ANPP increase was primarily driven by the increase in Artemisia capillaris, a companion forb sensitive to precipitation variation. The plant community composition shifted with precipitation enhancement—from a community dominated by Stipa tianschanica, a perennial grass, to a community dominated by Artemisia capillaris.

Synthesis. The findings imply that the ecosystem sensitivity to future changes in precipitation variability will be mediated by two potential mechanisms: concurrent N deposition and plant community‐level change. It is suggested that we should consider the vegetation compositional shift and multiple resource colimitation in assessing the sensitivity of terrestrial ecosystems to climate change.