Search results

The purpose of this article is to understand the current research status and future development trends in the field of numerical simulation on rock mass grouting.

This article first searched the literature database (EI, Web of Science, CNKI, etc.) for keywords related to the numerical simulation of rock mass grouting to obtain the initial literature database. Then, from the initial database, several documents with strong relevance to the numerical simulation theme of rock mass grouting and high citation rate were selected; some documents from the references were selected as supplements, forming the sample database of this review study (a total of 90 articles). Finally, through sorting out the relationship among the literature, this literature review was carried out.

The numerical simulation of rock mass grouting is mainly based on the porous media model and the fractured media model. It has experienced the development process from Newtonian fluid to non-Newtonian fluid, from time-invariant viscosity to time-varying viscosity, and from generalized theoretical model to engineering application model. Based on this, this article summarizes four scientific problems that need to be solved in the future in this research field: the law of grout distribution at the cross fissures, the grout diffusion mechanism under multi-field coupling, more accurate grouting theoretical model and simulation technology with strong engineering applicability.

This research systematically analyzes the current research status and shortcomings of numerical simulation on rock mass grouting, summarizes four key issues in the future development of this research field and provides new ideas for the future research on numerical simulation on rock mass grouting.

This paper aims to study the corrosion inhibition behavior of imidazopyridine and its three derivatives on brass.

The authors performed weight loss experiments, electrochemical experiments including the polarization curve and electrochemical impedance spectrum, corrosion morphology observation using scanning electron microscope (SEM) and atomic force microscope (AFM) and surface composition analysis via X-ray photoelectron spectroscopy (XPS) to analyze the corrosion inhibition behavior of imidazopyridine and its three derivatives on brass by using quantum chemical calculation (Gaussian 09), molecular dynamics simulation (M-S) and Langmuir adsorption isotherm.

According to the results, imidazole-pyridine and its derivatives were found to be modest or moderately mixed corrosion inhibitors; moreover, they were spontaneously adsorbed on the metal surface in a single-layer, mixed adsorption mode.

The corrosion inhibition properties of pyrazolo-[1,2-a]pyridine and its derivatives on brass in sulfuric acid solution were analyzed through weight loss and electrochemical experiments. Moreover, SEM and AFM were simultaneously used to observe the corrosion appearance. Furthermore, XPS was used to analyze the surface. Then, Gaussian 09 and M-S were combined along with the Langmuir adsorption isotherm to investigate the corrosion inhibition mechanism of imidazole-[1,2-a]pyridine and its derivatives.

A counterintuitive finding of existing research is that negative reviews can produce positive effects; for example, they can increase purchase likelihood and sales by increasing product awareness. It is important to continue highlighting this fact and to develop further insights into this positive effect, as a more thorough analysis can provide online retailers with a more comprehensive understanding of how to effectively manage and use negative reviews. Thus, by using an eye-tracking method, this paper attempts to provide a further thorough analysis of positive effects of negative reviews from a cognitive perspective.

An eye-tracking experiment with two tests over a time delay was performed to examine whether negative reviews have some positive effects. Review valence (positive vs. negative), brand popularity (popular vs. unpopular) and advertising exposure (no repetition vs. repetition) were considered in the experiment.

The results show that a cognitive process of attention allocation happens when consumers deal with brand popularity cues and that arousal evoking and attention allocation occur when handling review valence. Allocation of more attention to unpopular brands helps improve brand awareness and enhance brand memory, and larger arousal from negative reviews narrows attention and leads to a better memory of products and brands. However, with the passage of time, the memory of review valence can dissociate and fade, and the remaining awareness of and familiarity with unpopular brands with negative reviews contribute to a positive reversion, which leads to the production of positive effects from negative reviews.

This paper contributes to the literature on online reviews by examining the visual processing of review valence and brand popularity with an eye-tracking method and by revealing the cognitive mechanism of positive effects of negative reviews from a visual attention perspective.

The authors provide firm-level evidence that external financing affects international trade in a way different from internal financing.

The authors separate new entrants from incumbent exporters and investigate the roles of external and internal financing in export market participation and export quantity.

The authors find that external financing is of particular importance, as well as internal financing, in helping a firm become a new exporter. By contrast, external financing, unlike internal financing, is not significantly important for an incumbent exporter to stay in the international market. Regarding export quantity, a firm's internal financing is positively associated with more export quantity, whereas external financing is not.

The authors’ findings are consistent with the existence of significant fixed cost for entering the export market and external financing is particularly needed to cover such cost. Meanwhile, the financial need for maintaining the export status is much less and can be satisfied via internal financing.

The purpose of this study is to develop and test a multilevel conceptual model which explains how authentic leadership (AL), through an innovative team atmosphere and promotion of self-efficacy, influences creativity. The study delineates two pathways from AL to creativity. The first pathway is an indirect effect through an innovative atmosphere at the team level and self-efficacy at the individual level, while the second pathway focuses on the moderating effect of AL between self-efficacy and individual creativity.

Data were collected from 58 team leaders and 283 employees in a creative industry park in the Yangtze River Delta region from China. Path analysis was conducted to test the proposed hypotheses using the statistical package M-plus (v. 7).

The results reveal that AL is an important antecedent of creativity. Furthermore, an innovation-based atmosphere at the team level mediates the theorized relationship between AL and individual creativity. However, creative self-efficacy at the individual level does not mediate this relationship. Finally, the study found that AL moderates the relationship between creative self-efficacy and individual creativity.

The implications of this study highlight important considerations for enterprises in creative industry parks within and beyond China. This study provides industry leaders with a clearer and more insightful and coherent means of understanding the mediating mechanism between AL and creativity, and the moderating effects of AL between individual self-efficacy and creativity through a new linkage model.

Drawing from resource orchestration theory, this research proposed an integrative model that leverages insights into counter resource constraints and uncertainty in start-up business model innovation (BMI). It investigated the influences of entrepreneurial networks and effectuation on BMI through bricolage in uncertain environments.

The research surveyed 481 start-ups in China. LISREL 8.80 and SPSS 22.0 were employed to test the validity and reliability of key variables, respectively. Additionally, hypotheses were examined through multiple linear regression.

First, entrepreneurial networks and effectuation were positively related to BMI, and combining these two factors improved BMI for start-ups. Second, bricolage contributed to BMI and played mediating roles in translating entrepreneurial networks and effectuation into BMI. Third, environmental uncertainty weakened the linkage between bricolage and BMI.

Future research should replicate the results in other countries because only start-ups in China were investigated in the study, and it is necessary to extend this research by gathering longitudinal data. This research emphasized the mediating effects of bricolage and the moderating influence of environmental uncertainty, and new potential mediating and moderating factors should be explored between resources and BMI.

There are three significant theoretical contributions. First, the findings enrich the literature on the complex antecedents of BMI by combining the impacts of entrepreneurial networks and effectuation. Second, an overarching framework is proposed explaining how bricolage (resource management) links entrepreneurial networks and effectuation and BMI. Third, it demonstrates the significance of environmental uncertainty in the bricolage–BMI linkage, deepening the understanding of the bricolage boundary condition.

Contractual services are characterized by features such as termination fees, long-term commitment, and complex terms. When customers find better deals from other providers, they may want to switch, but contractual obligations prevent them from doing so. Thus, this study aims to draw upon the stimulus-organism-response paradigm and theories of emotion regulation to examine how punitive switching costs (PSCs) can evoke negative emotions (NEs) from customers and, consequently, lead to negative behavioral responses in contractual service settings.

This study collected data from 395 customers of telecommunications companies, fitness centers, tutoring firms/centers, and house leasing companies in Taiwan. We tested the hypotheses using partial least squares structural equation modeling via SmartPLS 3.0.

The results show that NEs partially mediate the relationship between PSC and customers’ switching intention and negative word-of-mouth. This study also finds alternative attractiveness (AA) and service recovery (SR) do not moderate the PSCs–NEs relationship, but AA does directly influence NEs.

First, this study contributes to the literature on switching costs by exploring how PSC exerts a detrimental impact on behavioral responses. Second, this study adds to the literature on service failures by identifying the mediating role of NEs in such a relationship.

Effective and robust motion estimation with sub-pixel accuracy is essential in many image processing and computer vision applications. Due to its computational efficiency and robustness in the presence of intensity changes as well as geometric distortions, phase correlation in the Fourier domain provides an attractive solution for global motion estimation and image registration. The paper aims to discuss these issues.

In this paper, relevant sub-pixel strategies are categorized into three classes, namely, single-side peak interpolation, dual-side peak interpolation and curve fitting. The well-known images “Barbara” and “Pentagon” were used to evaluate the performance of eight typical methods, in which Gaussian noise was attached in the synthetic data.

For eight such typical methods, the tests using synthetic data have suggested that considering dual-side peaks in interpolation or fitting helps to produce better results. In addition, dual-side interpolation outperforms curve fitting methods in dealing with noisy samples. Overall, Gaussian-based dual-side interpolation seems the best in the experiments.

Based on the comparisons of eight typical methods, the authors can have a better understanding of the phase correlation for motion estimation. The evaluation can provide useful guidance in this context.

This study aims to explore the mediating effect of digital options on the relationship between emerging information technology investments (ITIs) and firm performance (FP). In particular, it analyses the performance impacts of investments in five emerging technologies of IT or non-IT firms.

Secondary data are collected from Chinese A-share listed companies from 2010 to 2018. The authors propose an econometric model focusing on the impact of ITIs on a firm’s market value and profit. A propensity score matching model is applied to control endogeneity.

The ITIs’ effect on FP is found to be completely mediated by digital options, and the reach of digital options plays a more positive role in the relationship between ITIs and Tobin’s Q, whereas the richness of digital options is stronger between ITIs and return on net assets (ROE). The group study shows that the impact of process technologies such as cloud computing and the Internet of Things has a more profound impact on Tobin’s Q, and the knowledge technologies represented by artificial intelligence, blockchain and big data strongly affect ROE. In addition, the positive relationship between ITIs and FP is unrelated to IT/non-IT firms.

First, the data are based on 219 publicly announced emerging ITIs in China and thus may not be generalizable to other cultural/national contexts. Second, there is a lack of a large sample data set of emerging ITI information in China, and the duration of this study is constrained to the relatively short rise of emerging technologies.

This study provides firm decision-makers with practical implications. The results imply that the effect of ITIs on FP depends on digital options, so both IT firms (e.g., Big Tech giants) and non-IT firms (e.g., incumbents) should discover how to balance firm value and profit in their management of emerging technology investment projects with digital options thinking.

To the best of the authors’ knowledge, this is the first empirical study to investigate the relationship between ITIs and FP from the perspective of digital options, exploring five emerging technologies and considering firm life, size, and state ownership in a sample of Chinese listed firms.

Psychological resilience, defined here as the capacity to bounce back from adversity and failure, has been studied in various leadership contexts. However, the literature demonstrates less consensus concerning how psychological resilience manifests in, and interacts within, the leadership role and, equally, the focus on resilience development is underdeveloped. This paper addresses these issues by focusing on the interactions between psychological resilience and leadership and presents practical development strategies.

A systematic review employing 46 empirical studies followed a thematic synthesis within an associated model encapsulated as building-up resilience and being effective.

First, resilience is identified as essential and can benefit individuals and organizations' work outcomes across leadership contexts, including work performance, job engagement, well-being, and enhanced leadership capability. Secondly, leaders may build up their resilience by obtaining coping skills and improved attitudes toward challenges. Resilient attitudes, which are presented as paradoxical perspectives towards challenges, may help leaders adapt to challenges and adversities leading to beneficial outcomes.

Even though this study provides a deeper understanding of the essential function of psychological resilience in leadership, the findings are limited to the workplace contexts investigated, e.g. exploring small sample sizes (13,019) or country contexts (22). Future research could expand the rhetoric around interactions between psychological resilience and leadership. Furthermore, the underlining mechanism between the paradoxical perspective and resilient attitudes is still largely unclear. Thus, more research is needed to disclose the interaction of paradoxical perceptions and leadership resilience. Further research can investigate how resilient attitudes demonstrate in actions in dealing with challenges and adversities.

The authors further an argument that leaders may enhance their resilience through embracing a paradoxical perspective towards challenges (resilient attitude), e.g. being adaptive to adversities, and the attitude of learning from failures. These enhanced resilient attitudes could help leaders deeper understand and examine their reality and persist under high pressures and develop an innate ability to utilise resources more effectively to help them survive and thrive in challenging circumstances, instead of becoming overwhelmed by the burden of complexity or giving up. This will offer a practical contribution to resilience development.

Importantly, this study found that resilience is an essential leadership trait and can benefit individuals and organizations' work outcomes across leadership contexts. These positive effects of resilience may encourage organizations or society to promote psychological resilience, including a resilient attitude, to deal with adversities and uncertainties.

Fundamentally, the synthesized model applied may encourage further studies to focus on how to build up resilience and practically apply it in workplaces across leadership contexts. In particular, this study found that adopting paradoxical perspectives and ambidextrous leadership approaches toward adversities is an original resilience development strategy, which serves to contribute to the gap in the literature.