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This research aims to investigate the effects of manipulation of a torpedo’s geometries to attain higher terminal velocity. The parameters of interest include geometric changes of the original design, as well as sea water properties that reflect water depth in South China Sea.

The research make use of computational fluid dynamics (CFD) software, FLUENT, to solve viscous incompressible Navier–Stokes equations with two equations k-epsilon turbulent model. The calculated drag coefficient is subsequently used to calculate the maximum attainable terminal velocity of the torpedo.

It was found that the terminal velocity can be improved by sharper tip angle, greater aspect ratio, greater diameter ratio and optimum rear angle at 30°. Sensitivity of drag coefficient toward each of the parameters is established in this paper.

The paper, in addition to verifying the importance of aspect ratio, has also established the tip angle, diameter ratio and rear angle of the torpedo as important geometric aspects that could be tuned to improve its terminal velocity.

This study aims to examine the venture capital (VC) industry in China. It has demonstrated a history of high growth with significant variations over time. The authors have examined the trends and determinants of VC investments in China over a 20-year period from 1995 to 2014. They find that the aggregate amount of VC investments, the total number of venture deals and the average amount of venture investments per deal in China are all significantly impacted by macroeconomic conditions (i.e. GDP, export, money supply), technology innovations and financial market indicators (i.e. initial public offerings (IPOs), interest rate, price-to-earnings ratio, etc.). They also find that the 2007 China A-Share stock market crash and the subsequent global financial crisis have motivated VCists in China to adjust their investment strategies and risk levels by allocating more capital to later-stage investments and securing more deals with later-round financings. However, after the 2008 global financial crisis, the China’s venture industry has recovered faster compared to the US counterpart response.

The authors first perform trend analysis of VC investments at an aggregate level, by stages of development, and across industry from 1995 to 2014.To test H1 and H2, the authors use multiple regression models with lagged explanatory variables. To test H3, the authors use univariate tests to compare the measures of VC investments at an aggregate level, stage funds ratios, stage deals ratios and financing series ratios during both a five-year and seven-year time windows around the 2007 A-Share stock market crash and the subsequent financial crisis.

The development of the VC industry in China has demonstrated a history of high growth with significant variation over time. The authors find that the aggregate amount of VC investments, the total number of venture deals and the average amount of venture investments per deal in China are all significantly impacted by macroeconomic conditions (i.e. GDP, export, money supply), technology innovations and financial market indicators (i.e. IPOs, interest rate, price-to-earnings ratio, etc.). The authors also find that the 2007 China A-Share stock market crash and the subsequent global financial crisis have motivated VCists in China to adjust their investment strategies and risk by allocating more capital to later-stage investments and securing more deals with later-round financings. However, the China VC industry has recovered faster compared to the USA just after the 2008 global financial crisis.

There are also limitations in the study. The VC data in China in the earlier 1990s might not be very reliable due to the quality of statistics. Therefore, the trend analysis and discussions mainly focus on the time after 2000. Also, the authors cannot find VC financing sequence data for the analysis. Second, there is no doubt that the policy impact from Chinese transforming economic system and government policies on its VC industry is substantial (Su and Wang, 2013). However, they cannot find an appropriate variable to be included in the empirical models to consider this effect. Further study on this area would provide meaningful information. Third, although the authors have done comparison study between the VC industry in China in this study and the VC industry in the US documented in Ning et al. (2015) and discussed some interesting findings, more in-depth research in this area will be very useful.

The findings have meaningful implications for VCists and start-up companies seeking equity financings in China. VCists should closely monitor macroeconomic and market conditions to make appropriate adjustments to their risk and investment strategies. Entrepreneurs seeking equity financings for their business could also monitor the identified macroeconomic and market indicators, which can help them with their timing and to negotiate a better equity financing deal. VC financing is more likely to succeed when key macroeconomic and market indicators become favorable.

This paper contributes to the literature by testing the supply and demand theory on the VC market proposed by Poterba (1989) and Gompers and Lerner (1998) from the macroeconomic perspective using 20 years’ VC data from China. The authors also examine how the 2007 A-Share stock market crash and the subsequent financial crisis affected VCists to adjust their risk levels and investment strategies. It provides useful information for international academia and policymakers to understand the quick rise of China VC industry. The authors also find that the macroeconomic drivers of VC industry are somewhat different under different economic systems.

This paper aims to investigate the influence of company-specific attributes on capital structure decisions of Islamic banks (IBs) in Gulf Cooperation council (GCC) countries during the period 2009-2011.

To improve the econometric estimates’ efficiency, the paper uses the generalized least square (GLS) regression model to increase the levels of freedom and reduce collinearity.

The empirical results indicate that bank size, liquidity and corporate age are positively associated with the leverage ratio of GCC IBs, supporting the trade-off theory. Inconsistent with theoretical predictions, it is found that the profitability, tangibility and growth have positive insignificant relationship with the level of leverage, suggesting these determinants are not important in capital structure decisions. Furthermore, gross domestic product (GDP) and non-debt tax shield have negative effects on the leverage ratio and significant for GDP.

Overall, the evidence provided in the study highlights the significance of company-specific characteristics in determining and affecting the capital structure decisions of IBs in GCC countries. It is useful to use these variables in the analysis of IBs’ capital structure in the GCC region before the financial crisis in 2007. One limitation for this study is that the sample is restricted to only the Islamic banking sector. Future research could include all Islamic financial institutions (IFIs) operating within the Gulf region. Second, the study only concentrates on GCC countries to the neglect of other countries. Finally, the study controls for the country level only and does not account for firm factors. Future research could consider all these limitations. Another possible avenue is by examining other variables, such as corporate governance mechanisms.

Despite that most previous studies investigated the determinants of the capital structure of financial conventional industries, research on Islamic banking is almost non-existent. Moreover, the extant literature on Islamic finance has been theoretically explored, and the empirical research regarding capital structure is still in the infancy stage. Accordingly, it is evident that based on the Islamic trade-off perspective, theoretical hypotheses and empirical findings provide a novel addition to the capital structure theory for IFIs.

The present paper proposes a theoretical analysis of the stability characteristics of a Jeffcott rotor‐hybrid bearing system. It is intended that on the basis of the numerical results drawn from this study, appropriate recess depth, land size, orifice location and speed parameter for stable operation can be determined for use in the bearing design process.

A Jeffcott rotor supported by hybrid oil film bearings with dual‐row recesses and orifice‐ compensated restrictors is studied. In order to facilitate the calculation of film dynamics, using the perturbation method, the Reynolds equation was linearized and subsequently solved using finite difference techniques, whilst the stability maps were determined by the Routh‐Hurwitz method.

The data reported here suggest that the stability characteristics of the Jeffcott rotor‐bearing system could be improved by the use of shallow, dual‐recessed hybrid bearings with orifice compensation. In addition to greater eccentricity ratios, smaller land‐width ratios and greater shaft stiffness may also provide shallow‐recessed bearings with better stability. In all cases, the stability provided by upstream orifice‐sited bearings is better than that provided by center orifice‐sited bearings, whilst high‐speed parameters may also provide a greater stability threshold.

This study proposes an extensive database as a critical requirement in the design of hybrid bearings, in order to ensure that a rotor bearing system is operating stably.

The major objective of any business organization should be to create value for its stockholders or owners. If the stock of a publicly held corporation does not provide its shareholders with a return that increases their wealth, that corporation is not meeting its most fundamental obligation.

The purpose of this study is to evaluate the determinants of health outcomes of dialysis patients, while specifically focusing on the role of dialysis process measures and dialysis practice characteristics. The dialysis industry is facing a major transition from a volume-based health care system to a value-based cost-efficient care model, in the USA. Under the bundled Prospective Payment System, the treatment-based payment model is subject to meeting quality thresholds as defined by clinical process measures including dialysis adequacy and anemia management. Few studies have focused on studying these two processes and their association with the quality of patient health outcomes.

In this study, the authors focus on identifying the determinants of patient health outcomes among freestanding dialysis clinics, using a large cross-sectional data set of 4,571 dialysis clinics in the USA. The authors use econometric analyses to estimate the association between dialysis facility characteristics and practice patterns and their association with dialysis process measures and hospitalization risk.

The authors find that reusing dialyzers and increasing the number of dialysis stations is associated with higher levels of clinical quality. This research indicates that deploying more nurses on-site allows patients to avail adequate dialysis, while increasing the supply of physicians can hurt anemia control process. In addition, the authors report that offering peritoneal dialysis and late night shifts are not beneficial practices in terms of their impact on the hospitalization risk.

While early studies of dialysis care mainly focused on the associations between practice patterns and patient outcomes, this research reveals the underlying mechanisms of these relationships by exploring the mediation effects of clinical dialysis processes on patient outcomes. The results indicate that dialysis process measures mediate the impact of the operational characteristics of dialysis centers on patient hospitalization rates.

This study offers several managerial insights for owners and operators of dialysis clinics with respect to the association between managerial and clinical practices that they deploy within dialysis clinics and their impact on clinical quality measures as well as hospitalization risk of patients. Managers can draw on this study to optimize staffing levels in their dialysis clinics, and implement innovative clinical practices.

Considering the growth in healthcare expenditures in developing and developed countries, and specifically for costly diagnoses such as dialyses, this study offers several insights related to the inter-relationships between dialysis practice patterns and their clinical quality measures.

This study makes several major contributions. First, the authors address the extant gap in the literature on the relationships between dialysis facility and practice characteristics and clinical outcomes, while specifically highlighting the role of clinical process measures as antecedents of patient hospitalization ratio, a key metric used to measure performance of dialysis clinics. Second, this study sheds light on the underlying mechanisms that serve as enablers of the dialysis adequacy and anemia management. To the best of the authors’ knowledge, this is the first study to explore these relationships in the dialysis industry. The authors’ approach provides a new direction for future studies to explore the pathways that may impact clinical quality measures in the delivery of dialysis services.

The purpose of this paper is to evaluate the thermal and fluid dynamic behaviors of natural convection in a vertical channel‐chimney system heated symmetrically at uniform heat flux in order to detect the different fluid motion structures inside the chimney, such as the cold inflow from the outlet section of the chimney and the reattachment due to the hot jet from the channel, for different extension and expansion ratios of the adiabatic extensions.

The model is constituted by two‐dimensional steady‐state fully elliptic conservation equations which are solved numerically in a composite three‐part computational domain by means of the finite‐volume method.

Stream function and temperature fields in the system are presented in order to detect the different fluid motion structures inside the chimney, for different extension and expansion ratios of the adiabatic extensions. The analysis allows to evaluate the effect of the channel aspect ratio on the thermal and fluid dynamic behaviors on a channel‐chimney system and thermal and geometrical conditions corresponding to a complete downflow. Guidelines to estimate critical conditions related to the beginning of flow separation and complete downflow are given in terms of order of magnitude of Rayleigh and Froude numbers.

The hypotheses on which the present analysis is based are: two‐dimensional, laminar and steady‐state flow, constant thermophysical properties with the Boussinesq approximation. The investigation is carried out in the following ranges: from 100 to 100,000 for the Rayleigh number, from 5.0 to 20 for the aspect ratio, from 1.0 to 4.0 for the expansion ratio and from 1.5 to 4 for the extension ratio.

Thermal design of heating systems in different technical fields, such as in electronic cooling and in building ventilation and houses solar components, evaluation of heat convective coefficients and guidelines to estimate critical conditions related to the beginning of flow separation and complete downflow.

The paper is useful to thermal designers because of its evaluation of the thermal and velocity fields, correlation for the Nusselt number and guidelines criteria in terms of Rayleigh and Froude numbers to evaluate conditions of flow separation and complete downflow in natural convection in air for vertical channels‐chimney systems.

Unlike previous studies on capital structure decisions, the purpose of this paper is to focus on US real estate investment trusts (REITs) in order to find out the main determinants of capital structure choice for real estate companies and in order to verify if they are related to factors similar to those affecting the decisions of public firms in other sectors.

Using a methodology similar to Rajan and Zingales, a sample of 119 listed REITs with different investment strategies and in different property sectors was analyzed. The analysis is carried out in order to determine the basic factors underpinning the capital structures by selecting financial items and ratios related with leverage (such as asset size, profitability ratios, tangibility of assets, growth opportunities, operating risk and geographical diversification of investments).

Results show that REITs follow a pecking order theory of financing since more profitable firms are less levered and REITs with more growth opportunities have higher leverage ratios. The tangibility of assets turns out to be positively correlated with leverage, while REITs whose operating risk is high prefer a lower financial risk and consequently a lower gearing. Finally, it is not clear how size affects leverage decisions and more diversified REITs appear to be riskier.

The research also addresses the issue of asymmetric information and the debt‐equity choice for REITs sampled on the basis of their size, highlighting differences with other business sectors.

The purpose of this paper is to examine how changes in creditors' rights affect the dividend policy behavior of corporate firms.

The authors use the implementation of the bankruptcy and insolvency code (IBC) in India in 2016 as a quasi-natural experiment setup. Differential application of this law allows them to use the Difference in Differences approach to extract the marginal impact of change in creditors' rights on the dividend policy.

The authors show that firms responded to strengthening creditors' rights by decreasing their dividend payout. Further, the authors observe that this negative response is conditioned on firm leverage and the nature of the creditor, i.e. public or private. The firms with a greater leverage ratio and a greater proportion of private debt in the total debt in the pre-event period have shown greater response to the change in the law. Lastly, the authors show that stock markets positively respond to the observed decrease in dividends only when a corresponding decrease in the leverage accompanies such a decrease.

The authors contribute to the finance and law literature from several aspects. First, the authors extend this stream by bringing to light the dividend policy response of firms when they are subjected to a change in creditors' rights. Second, the authors also show how firm-level factors like financial policy and the nature of the creditor condition their response to IBC. Lastly, the authors also examine the market reaction to the dividend policy response of firms to the change in bankruptcy law.