bluuebunny/crossref_metadata_2025_split huggingface dataset:
Mesoscopic transformation at initial corrosion stage of 20# steel in aqueous solution under gas–liquid two-phase stratified flow condition
Authors: Yang Guirong , Pan Zhaoxia , Zhang Zhenghai , Song Wenming , Ma Ying , Hao Yuan 
Published: March 2021

Purpose
This study aims to investigate the initial corrosion behavior in aqueous solution of 20# seamless steel under (CO2/aqueous solution) gas–liquid two-phase stratified flow conditions.

Design/methodology/approach
The initial corrosion behavior was studied through the weight loss methods, scanning electron microscopy with energy-dispersive x-ray spectroscopy and x-ray diffraction.

Findings
The corrosion rate of 20# steel obviously increases with the increasing gas pressure at different corrosion time when the CO2 pressure is less than 0.11 MPa, and the increase of corrosion rate tends to be steady when the pressure exceeds 0.11 MPa. With the increase of CO2 pressure, the corrosion products changed from flocculent to acicular, granular and scaly. A four-stage model for the growth of the corrosion product layer was proposed, namely, the diffusion reaction stage, the local film formation stage, the complete film formation stage and the densification stage of the product film.

Originality/value
A four-stage model for the growth of the corrosion product layer on the pipe wall surface under this condition was proposed, namely, the diffusion reaction stage, the local film formation stage, the complete film formation stage and the densification stage of the product film. The growing process and densification mechanism of corrosion products layer were discussed.
Study on hydrogen permeation behavior of X80 steel under AC stray current interference
Authors: Wang Ailing , Deng Yong , Li Kaihong , Li Wenlei , Yu Dongliang , Cui Gan , Liu JianGuo , Li Zili 
Published: March 2021

Purpose
Alternating current (AC) corrosion is a type of corrosion that occurs in buried pipelines under AC stray current interference, which can increase the hydrogen embrittlement sensitivity of pipelines. However, rare research works have been conducted on the hydrogen permeability characteristics of pipeline steel under AC stray current interference. The purpose of this paper is to study hydrogen permeation behavior of X80 steel under AC stray current interference.

Design/methodology/approach
In this paper, the hydrogen permeation behavior of X80 steel under AC interference is studied by AC hydrogen charging experiment in a dual electrolytic cell. The relationship between hydrogen evolution rate and hydrogen permeation flux is studied using the gas collection method. The difference between AC hydrogen permeability and direct current (DC) hydrogen permeability is also discussed.

Findings
The anodic dissolution caused by AC corrosion promotes the chemical desorption reaction of the adsorbed hydrogen atoms on the surface, reducing the hydrogen atom absorption ratio by 70%. When the AC is smaller than 150░ A/m2, the hydrogen permeation process is controlled by the hydrogen atom generation rate, and the hydrogen permeation flux increases with the increase in hydrogen atom generation rate. When the AC exceeds 400░ A/m2, the hydrogen permeation process is controlled by the absorption ratio. The hydrogen permeation flux decreases with the decrease in the absorption ratio. Under AC interference, there is a maximum hydrogen permeation flux that linearly correlates to the H+ concentration in the solutions.

Originality/value
The high-strength steel is very sensitive to hydrogen embrittlement, and X80 steel has been widely used in oil and gas pipelines. To date, no research has been conducted on the hydrogen permeation behavior of pipeline steel under AC interference, and the hydrogen permeability characteristics of pipeline steel under AC interference are not clear. The research results of this paper are of great significance for ensuring the intrinsic safety of high-strength pipelines under AC stray current interference.
Selecting Mutual Funds for Retirement Accounts (B)
Authors: Braun Phillip A. 
Published: March 2021

Alice Monroe was an admissions officer at the Kellogg School of Management at Northwestern University. It was early January 2017 and Alice had enrolled in Northwestern's 403(b) retirement plan two months earlier. After spending a considerable amount of time examining the mutual funds available through the university's retirement plan, Alice had picked two to invest in: a large-cap equity growth fund and a mid-cap equity fund. (See the related case "Selecting Mutual Funds for Retirement Accounts (A).") Her initial allocations were 50% of her investment dollars in each fund.
Upon further reflection, however, she realized these initial allocations were somewhat simplistic. She recalled, from an investments class she had taken at college, the topic of modern portfolio theory, which held that by adding more funds to her portfolio she might be able to achieve greater diversification and thereby reduce the overall risk of her portfolio and/or achieve a higher expected return. Alice now was considering adding an intermediate-term bond fund and a real estate fund to her retirement account.
She hoped to use modern portfolio theory to prove that these new funds would indeed help her diversify her portfolio. If they did, she would also reassess her portfolio weights to determine the optimal allocation.
Exploration of latent barriers inhibiting project management processes in adopting smart building technologies (SBTs) in the developing countries
Authors: Ghansah Frank Ato , Owusu-Manu De-Graft , Ayarkwa Joshua , Edwards David John , Hosseini M. Reza 
Published: March 2021

Purpose
While smart building technologies (SBTs) implementation ensures sustainability, their adoption is hampered by latent barriers, especially in project management processes. These latent barriers must be addressed to facilitate the successful and widespread adoption of SBTs. Therefore, this study aims to explore the significant latent barriers inhibiting the project management processes in adopting SBTs in developing countries.

Design/methodology/approach
A positivist research philosophy couched within a deductive approach was adopted to undertake a quantitative questionnaire survey of 227 project management and design team participants. Descriptive and inferential analytical tools (including a one sample T-test and exploratory factor analysis) were then adopted to interpret data collected.

Findings
The results reveal that the “high cost of smart sustainable materials and equipment” is the major significant barrier hindering the adoption of SBTs in developing countries. Latent barriers were: “structure and time-related barriers,” “construction-related barriers” and “human, policy and cost-related barriers”.

Originality/value
The study contributes novel insights into the prevailing nascent discourse on SBTs from the perspectives of construction project managers and design teams in developing countries, particularly. Furthermore, to the best of the authors’ knowledge, this is the first study that ascertains the significant barriers inhibiting project management processes in adopting SBTs in developing countries.
Is socioemotional wealth being influenced by the intentions to pursue succession on incumbent owners? Empirical research on Mexican family business
Authors: Contreras-Lozano Carlos Rafael , Flores-Ortiz Maria Virginia , Alcalá-Álvarez Ma. Del Carmen 
Published: March 2021

PurposeThe authors identify the theoretical constructions measuring the intentions to pursue succession as well as the socioemotional wealth theoretical framework, and the authors propose an objective of testing the relationships existing between them so as their importance giving evidence of their relevance.Design/methodology/approachIt is a research with a positivist philosophical position measuring in a quantitative way with a deductive and structured approach applied to 98 CEO owners of Mexican companies, using nonparametric methodologies the authors simulated subsamples with structural equation modeling in SmartPLS 3.3.2, the metrics on the model are described as a functionalist paradigm.FindingsDirectors' attitudes paired up with the intentions of succession are significantly related to the socioemotional aspect of the family business; although the theory proposes three aspects to measure these intentions, the social norm in this research has not been strong enough to be a predictor as an influence on the company's socioemotional wealth.Originality/valueThe authors found this a valuable paper for the complement of theory focused on purely manifesting aspects in family companies, because they identified theoretical and empirical relationships opening up guidelines for new research in socioemotional aspects in accordance with the entrepreneurs attitudes to achieve succession, the differentiation lies in measuring psychological aspects of the director's behavior toward succession and not to the succession per se as done in most research; also, the methodology of data analysis facilitates the reader to easily recognize the relationships between the proposed theoretical constructions, showing the detailed metrics development by researchers in the family business field.
How effectuation, causation and bricolage influence the international performance of firms via internationalisation strategy: a literature review
Authors: Coudounaris Dafnis N. , Arvidsson Henrik G.S. 
Published: March 2021

Purpose
This study aims to investigate the antecedents of the internationalisation strategy i.e., effectuation, causation and bricolage on the international performance of the firm.

Design/methodology/approach
In total, the study uses 138 peer-reviewed articles on effectuation, causation, effectual/causal decision-making logics and related issues such as the impact of antecedent factors of international strategy (i.e. effectuation, causation and bricolage) on the international performance of the firm.

Findings
Even though the theory of effectuation was formulated in 2001, to a large extent it has still not moved away from the realm of small entrepreneurial firms. The development of effectuation logic has accelerated in recent years, but the bulk of the research still focusses on small entrepreneurial firms rather than on the application of the theory in larger, non-entrepreneurial firms. Furthermore, effectuation theory would benefit from being developed into the realm of psychology and sociology.

Originality/value
This study offers a conceptual model on how effectuation, causation and bricolage influence internationalisation strategy, which, in turn, impacts the international performance of the firm. Furthermore, the study discusses the effectual logic for larger firms. The exponential growth of studies on effectuation during recent years, i.e. 2017 to the first quarter of 2020, shows that researchers have responded to calls by leading authors stating that effectuation theory is a field with great potential for further theoretical developments. This study presents a literature review of the critical issue of the engagement of internationalisation strategies with effectuation, causation, bricolage and the international performance of the firm compared to the earlier literature review for the period 2001–2016 by Matalamäki (2017) and Karami et al. (2019) on effectuation and internationalisation.
Wear performance of Al-TiC composite at elevated temperature
Authors: Agrawal Eshan , Tungikar Vinod 
Published: March 2021

Purpose
Aluminium matrix composites are subjected to wear as well as higher temperature applications such as pistons, cylinder heads and blocks for car engines. Therefore, it is important to evaluate the performance of aluminium metal matrix composite at elevated temperature.

Design/methodology/approach
In the present work wear performance of Al-TiC composite with 7.5% reinforcement of TiC powder is carried out at elevated temperature. The composite specimens are prepared with the help of centrifugal casting method to get the large segregation of reinforcement on the outer layer of the composite which is subjected to wear. Taguchi method is used for preparing design of experiments.

Findings
The wear test is performed on DUCOM pin on disc setup having the heating chamber facility. The results of wear test are analysed with the help of MINITAB 19 software. The results show that temperature has dominant effect on the wear rate. The mathematical model through regression is predicted for wear rate and coefficient of friction. The study of worn-out surface is performed with the help of scanning electron microscope. The micrographs show that the type of wear is changes from abrasive to severe wear and some delamination.

Originality/value
The experiments are conducted as per ASTM standards. The results give the mathematical equation for wear rate and coefficient of friction at elevated temperatures.
Providing emergency medical care without consent: How the ‘emergency principle’ in Australian law protects against claims of trespass
Authors: Boyle Sam , Stepanov Nikola 
Published: March 2021

AbstractIn a medical emergency, the usual requirement to obtain consent before giving treatment does not apply. This exception to the general rule on consent to medical treatment is known as the ‘emergency principle’. By considering a case scenario, and by adjusting the facts to this scenario, we explain the circumstances in which the emergency principle will protect practitioners from an action in trespass. Although the fundamentals of this principle are uncontroversial, there are a number of uncertainties and inconsistencies in this law in relation to certain parameters. For example, whether a practitioner would ever be obliged to seek consent from a substitute decision‐maker before providing emergency treatment is not clearly or consistently explained. We suggest the law should be clarified.
Mechanistic and phylogenetic insights into actinobacteria‐mediated oestrogen biodegradation in urban estuarine sediments
Authors: Hsiao Tsun‐Hsien , Chen Yi‐Lung , Meng Menghsiao , Chuang Meng‐Rong , Horinouchi Masae , Hayashi Toshiaki , Wang Po‐Hsiang , Chiang Yin‐Ru 
Published: March 2021

SummarySteroidal oestrogens are often accumulated in urban estuarine sediments worldwide at microgram per gram levels. These aromatic steroids have been classified as endocrine disruptors and group 1 carcinogens. Microbial degradation is a naturally occurring mechanism that mineralizes oestrogens in the biosphere; however, the corresponding genes in oestrogen‐degrading actinobacteria remain unidentified. In this study, we identified a gene cluster encoding several putative oestrogen‐degrading genes (aed; actinobacterial oestrogen degradation) in actinobacterium Rhodococcus sp. strain B50. Among them, the aedA and aedB genes involved in oestrogenic A‐ring cleavage were identified through gene‐disruption experiments. We demonstrated that actinobacterial oestrone 4‐hydroxylase (AedA) is a cytochrome P450‐type monooxygenase. We also detected the accumulation of two extracellular oestrogenic metabolites, including pyridinestrone acid (PEA) and 3aα‐H‐4α(3'‐propanoate)‐7aβ‐methylhexahydro‐1,5‐indanedione (HIP), in the oestrone‐fed strain B50 cultures. Since actinobacterial aedB and proteobacterial edcB shared < 40% sequence identity, 4‐hydroxyestrone 4,5‐dioxygenase genes (namely aedB and edcB) could serve as a specific biomarker to differentiate the contribution of actinobacteria and proteobacteria in environmental oestrogen degradation. Therefore, 4‐hydroxyestrone 4,5‐dioxygenase genes and the extracellular metabolites PEA and HIP were used as biomarkers to investigate oestrogen biodegradation in an urban estuarine sediment. Interestingly, our data suggested that actinobacteria are active oestrogen degraders in the urban estuarine sediment.
Instrumental variable methods in structural equation models
Authors: Grace James B. 
Published: March 2021

Abstract

Instrumental variable regression (RegIV) provides a means for detecting and correcting parameter bias in causal models. Widely used in economics, recently several papers have highlighted its potential utility for ecological applications. Little attention has thus far been paid to the fact that IV methods can also be implemented within structural equation models (SEMIV). In this paper I present the motivations, requirements and basic procedures for using SEMIV.

I first consider causal inference and IVs from the perspective of a randomized experiment with partial control of the cause of interest. I consider common sources of bias, the role of randomization and limits to its capacity to exclude bias. Sources of bias include omitted confounders, reciprocal causation, reverse causation and measurement error, all of which can all be seen as a single problem—endogeneity. The approach to estimating IV models most commonly used in econometric practice, two‐stage least squares regression (2SLS), is explained, followed by a brief exposition of the covariance modelling approach used in SEM. Using data from an ecological field experiment, I illustrate the use of the treatment variable as an IV and then illustrate procedures for evaluating candidate variables that might serve as additional IVs.

IV methods are shown to be useful for both detecting endogeneity and removing its influences. I illustrate some of the ways that bias can be generated, as well as diagnostic capabilities and means for remedy embedded within SEM. Procedures for screening and evaluating additional IVs reveal valuable lessons regarding the theoretical requirements and empirical standards for IVs.

SEMIV provides a useful way to detect and control for bias. I suggest that the use of IVs within the SEM framework can support the simultaneous pursuit of causal inference and explanatory modelling, a common pair of aspirations for ecologists. Moving forward, there is a need for a better understanding of the capabilities of SEMIV and requirements for successful application.
Complete clearance of condyloma acuminata using injection Vitamin D3
Authors: Jha Niharika 
Published: March 2021

AbstractAnogenital warts (AGWs) are caused by human papilloma virus (HPV) and are transmitted by sexual route. The available options for the treatment of AGWs are cumbersome, require multiple sittings and are associated with recurrence. This is a case report of a male with condyloma acuminata who was treated successfully using injection vitamin D3. No recurrence was observed in a follow‐up period of 6 months.
Work‐related musculoskeletal injuries among obstetricians and gynaecologists: A cross‐sectional survey of Fellows of Royal Australian and New Zealand College of Obstetricians and Gynaecologists (RANZCOG)
Authors: Kapoor Shveta , Mahomed Kassam , Kapoor Vishal 
Published: March 2021

BackgroundObstetricians and gynaecologists (O&Gs) are at a risk of work‐related musculoskeletal injuries (WRMI) on a daily basis.AimsTo describe the prevalence of WRMI among O&Gs in Australia and New Zealand, explore risk factors for such injuries, and evaluate their impact.MethodsAn online survey of Fellows of Royal Australian and New Zealand College of Obstetricians and Gynaecologists was conducted in July 2016. It comprised questions on personal attributes, type of work, site and cause of WRMI, if any and treatment required.ResultsWe received responses from 765 O&Gs giving a response rate of 38.3% (765/1997). Four hundred and ten specialists (53.6%) reported suffering a WRMI at some point, including 252 (32.9%) who reported multiple injuries. In multivariable analysis, females had increased risk of WRMI (odds ratio (OR): 2.12; 95% CI: 1.54–2.91) and among generalists and subspecialists, gynaecological oncologists had highest risk for WRMI (OR: 3.13; 95% CI: 1.21–8.14). Commonest sites of injury were back (218/633, 34.4%) and shoulder (131/633, 20.7%). Laparoscopic surgery (117/633, 18.5%) was the commonest cause of injury. Treatment was required for 88.6% of injuries (561/633) including 8.4% (53/633) of cases which required surgery. Ongoing symptoms post‐injury were reported for 52.1% of injuries (330/633) and in 25.8% (163/633) of instances the practitioner needed to modify their scope of work.ConclusionThis survey among a large cohort of O&Gs shows a high prevalence of WRMI with a profound negative impact on the practitioner and profession. There is a pressing need to advocate for improved ergonomics in their workplaces.
LRH‐A3 and HCG increase pregnancy rate during timed artificial insemination in dairy cows
Authors: Zheng Peng , Huang He , Li Xiaoyu , Huang Fushuo , Adeniran Samson Olugbenga , Wang Ziming , Feng Rui , Zhang Guixue 
Published: March 2021

AbstractThe objective of this study was to use luteinizing hormone‐releasing hormone A3 (LRH‐A3) and human chorionic gonadotrophin (HCG) to improve pregnancy rate of dairy cows during timed artificial insemination (TAI). In experiment 1, the TAI process (0 d, GnRH, 100 μg; 7 d, PGF2α, 0.4 mg; 56 hr, GnRH, 100 μg; 16 hr, AI) was applied to 160 dairy cows on 50th and 60th days after parturition respectively. In experiment 2, 320 postpartum dairy cows were treated with TAI (Group A), TAI + 25 μg LRH‐A3 (Group B), TAI + 1,500 IU HCG 5 days after AI (Group C), and TAI + 25 μg LRH‐A3 + 1,500 IU HCG 5 days after AI (Group D). In experiment 3, endometrial cells were treated with HCG. The results showed that TAI did not affect the pregnancy rate, while LRH‐A3 and HCG increased the pregnancy rate of the cow. HCG of 5 IU/ml and 10 IU/ml increased the expressions of leukemia inhibitory factor but decreased those of interleukin‐6, epidermal growth factor and vascular endothelial growth factor in endometrial cells. This study provided a plan for the use of LRH‐A3 and HCG to increase pregnancy rate during TAI in dairy cows.
A Bayesian spatial model for imaging genetics
Authors: Song Yin , Ge Shufei , Cao Jiguo , Wang Liangliang , Nathoo Farouk S. 
Published: March 2021

AbstractWe develop a Bayesian bivariate spatial model for multivariate regression analysis applicable to studies examining the influence of genetic variation on brain structure. Our model is motivated by an imaging genetics study of the Alzheimer's Disease Neuroimaging Initiative (ADNI), where the objective is to examine the association between images of volumetric and cortical thickness values summarizing the structure of the brain as measured by magnetic resonance imaging (MRI) and a set of 486 single nucleotide polymorphism (SNPs) from 33 Alzheimer's disease (AD) candidate genes obtained from 632 subjects. A bivariate spatial process model is developed to accommodate the correlation structures typically seen in structural brain imaging data. First, we allow for spatial correlation on a graph structure in the imaging phenotypes obtained from a neighborhood matrix for measures on the same hemisphere of the brain. Second, we allow for correlation in the same measures obtained from different hemispheres (left/right) of the brain. We develop a mean‐field variational Bayes algorithm and a Gibbs sampling algorithm to fit the model. We also incorporate Bayesian false discovery rate (FDR) procedures to select SNPs. We implement the methodology in a new release of the R package bgsmtr. We show that the new spatial model demonstrates superior performance over a standard model in our application. Data used in the preparation of this article were obtained from the ADNI database (https://adni.loni.usc.edu).