Search results

Reynolds-averaged Navier–Stokes (RANS) models often perform poorly in shock/turbulence interaction regions, resulting in excessive wall heat load and incorrect representation of the separation length in shockwave/turbulent boundary layer interactions. The authors suggest that this can be traced back to inadequate numerical treatment of the inviscid fluxes. The purpose of this study is an extension to the well-known Harten, Lax, van Leer, Einfeldt (HLLE) Riemann solver to overcome this issue.

It explicitly takes into account the broadening of waves due to the averaging procedure, which adds numerical dissipation and reduces excessive turbulence production across shocks. The scheme is derived based on the HLLE equations, and it is tested against three numerical experiments.

Sod’s shock tube case shows that the scheme succeeds in reducing turbulence amplification across shocks. A shock-free turbulent flat plate boundary layer indicates that smooth flow at moderate turbulence intensity is largely unaffected by the scheme. A shock/turbulent boundary layer interaction case with higher turbulence intensity shows that the added numerical dissipation can, however, impair the wall heat flux distribution.

The proposed scheme is motivated by implicit large eddy simulations that use numerical dissipation as subgrid-scale model. Introducing physical aspects of turbulence into the numerical treatment for RANS simulations is a novel approach.

The purpose of this paper is to measure Farmer’s adoption tendency towards drought shock, risk-taking networks and modern irrigation technology.

Based on this assumption, this paper evaluated the data gathered from 498 household surveys of Zhangye, Gansu province, PRC, by using the binary probit model. First, the empirical data was analyzed for evaluating the impact of drought shock and risk-taking tendencies on the adoption of modern irrigation technology by farmers. Second, the authors introduced informal risk-bearing networks with formal risks. Final, based on the empirical results, the sustainability test, along with the marginal effect analysis and the degree of impact was carried out.

The results show that the drought shock has a significantly deferent effect on the modern irrigation technology of the farmers. The probability of using technology for each level of drought loss is reduced by 15.02%. The risk-taking network has a significant role in promoting the modern irrigation technology of farmers. The probability of adoption for each additional unit of rural household labor security supply, the likelihood of adoption by farmers increased 23.11%, the probability of approval for each level of relative support, and neighborhood assistance by farmers increased by 13.11% and 17.88% respectively. This study further revealed that insurance purchases enabled farmers to adopt new irrigation technology with the probability increased by 24.99%; easily available bank loans increased the probability of farmers using irrigation technology by 31.89%. From the perspective of interactions between farmers, the risk-taking network can alleviate the inhibitory effect of drought impact towards the adoption of irrigation technology. Among the control variables, the number of years of education, the age of farming, the degree of arable land, the distance from home to the market, and the price of water all has significant effects on the adoption of modern irrigation technology by farmers.

The novelty of the study is that it illustrated the interactive influence of drought shock and risk-taking networks on the farmer’s adoption tendencies of modern irrigation technologies, the inner relationship among drought impact, the risk-taking network and the farmer’s adoption behavior and provide an interactive relationship between the formal risk-taking network and the non-risk-taking network in farmer’s technology adoption.

The purpose of this paper is to discuss the political turbulence of the times and discuss how political movements and political events that appear to be shocking to many are linked with major transformations in the global economy in recent decades. The author shows how the political and economic situation will likely have little impact on tourism inflows in major developed countries in coming years.

The paper explores global changes since the end of the Cold War and how this has impacted upon potential tourists in tourist source markets and host destinations. It is a global analysis, exploring changes since the Cold War.

Western countries will continue to experience all sorts of political and social turbulence for the foreseeable future, as their populations become increasingly bifurcated in terms of their wealth and the fiat currency system and fractional reserve system of banking reaches the limits of what it is capable of. However, this does not necessarily mean that tourists will be deterred from travelling to developed countries, as long as the developed countries shield visitors from social upheaval and politically unpleasant events such as strikes, riots, and demonstrations.

The practical implications are that managers in the tourism industry should become increasingly aware of the widening gap between the rich and poor in developed countries and prepare for the political and social shocks of dealing with this phenomenon. The phenomenon will have political expression in political movements that will pay lip service to populist demands but will also have expression in disappointed populations that will take part in social unrest of all sorts. Managers should prepare for various expressions of unrest in developed countries that had not been so widespread, including strikes, demonstrations, and riots.

This paper discusses the ascendency of Donald Trump to the US Presidency and the increasing visibility of other political nonconformist movements in western countries as a possible threat to tourism in developed countries. It links the changing political and social reality of citizens since the end of the Cold War to the future role that developed countries will play in the tourism industry, largely as hosts to the world’s affluent class created by globalization.

The purpose of this paper is to offer a Christian perspective on the ethical issues related to natural procreation and artificial reproduction methods.

This paper uses descriptive and comparative methodology between the ethical aspects specific to natural procreation and artificial reproduction.

Religious beliefs play a significant role in shaping the moral perspective when an infertile couple is confronted with the choice between natural procreation and artificial reproduction.

This paper survey a broad bibliography and offers a critical evaluation of the moral aspects specific to different methods of reproductive technologies compared to the natural procreation approach.

This paper aims to investigate voiding phenomena in solder joints under thermal pads of light-emitting diodes (LEDs) assembled in mass production environment by reflow soldering by using seven low-voiding lead-free solder pastes.

The solder pastes investigated are of SAC305 type, Innolot type or they are especially formulated by the manufacturers on the base of (SnAgCu) alloys with addition of some alloying elements such as Bi, In, Sb and Ti to provide low-void contents. The SnPb solder paste – OM5100 – was used as a benchmark. The solder paste coverage of LED solder pads was chosen as a measure of void contents in solder joints because of common usage of this parameter in industry practice.

It was found that the highest coverage and, related to it, the least void contents are in solder joints formed with the pastes LMPA-Q and REL61, which are characterized by the coverage of mean value 93.13% [standard deviation (SD) = 2.72%] and 92.93% (SD = 2.77%), respectively. The void diameters reach the mean value equal to 0.061 mm (SD = 0.044 mm) for LMPA-Q and 0.074 mm (SD = 0.052 mm) for REL61. The results are presented in the form of histograms, plot boxes and X-ray images. Some selected solder joints were observed with 3D computer tomography.

The statistical analyses are carried out on the basis of 2D X-ray images with using Origin software. They enable to compare features of various solder pastes recommended by manufacturers as low voiding. The results might be useful for solder paste manufacturers or electronic manufacturing services.

Investigating technical terms of vehicle spare parts used in the mechanics' jargon in Saudi Arabic (SA) and Yemeni Arabic (YA) has received scant attention. The current study, therefore, is an attempt to shed some light on the topic. The aim is to identify the strategies used for creating equivalents in vehicle spare parts vocabulary and to pinpoint the most salient variations between the two dialects in this jargon.

More than 250 terms of vehicle spare parts were collected and analyzed qualitatively. Each list contains nearly 125 items. They were gathered from two main resources: semi-structured interviews with vehicle mechanics, and written lists from spare parts dealers in both countries.

Three main strategies are found at work: lexical borrowing (from English and French), metaphor and loan translation. Direct borrowing is the most influential strategy where loanwords represent nearly one-third of the data, the majority of which is from English. Metaphorical extensions and literal translations also have an important role to play in the process of spare part naming. While the two dialects share common practices in terms of literal translation, they are characterized by many differences with regard to lexical borrowing and metaphors.

The study approaches an under-researched topic that is related to the mechanic's jargon in Arabic and leaves the door open for further research. The findings of this study may be used as guidelines for Arabic academies and those who are concerned with translating and studying technical terms in the field of mechanical engineering.

This study aims to reflect on quality, sustainability and resilience as emerging organisational priorities within total quality management (TQM) and organisational excellence.

The paper uses a conceptual approach based on reflection and theoretical studies on the philosophical foundations of quality, excellence, resilience and sustainability as cornerstones for organisational excellence. Bearing in mind that sustainable excellence rests upon a combination of systemic and soft issues that define organisational ability for resilience and sustainability, there is a need to analyse and reflect on short business cases from world-leading companies and further reflect on the fundamental principles, which have helped such companies to survive, grow and sustain. This study includes such a business case – the LEGO case. In addition, a Japanese case has been included. Japanese training material on human motivation developed in the 1980s exemplifies how company managers were trained, at that time, to understand and practice human motivation, excellence principles and tools.

Organisational excellence constitutes an evolving concept as the world becomes more chaotic and interconnected with multiple disruptive shocks. Organisational excellence challenges the inflexibilities of Newtonian mindsets, recognising the paramount importance of interactions and further underlining the significance of invisible elements such as human potentiality, motivation and values that formulate the principles of organisational excellence.

The paper investigates the notions of quality, resilience and sustainability and their relation to motivation and organisational excellence within the framework of business management and TQM. A world-leading company – LEGO – will be used to exemplify the theoretical findings together with the Japanese Motivation Training Programme case.

Mainstream pornography is popular, freely accessible, and infused with themes of male dominance, aggression, and female subservience. Through depicting sex in these ways, mainstream pornography has the potential to influence the further development of harmful sexual scripts that condone or endorse violence against women and girls. These concerns warrant the adoption of a harms-based perspective in critical examinations of pornography's influence on sexual experiences. This chapter reports on findings from interviews with 24 heterosexual emerging adults living in Aotearoa/New Zealand about how pornography has impacted their lives. Despite a shared awareness among participants of mainstream pornography's misogynistic tendencies, and the potential for harm from those displays, men's and women's experiences were profoundly gendered. Men's reported experiences were often associated with concerns about their own sexual behaviors, performances, and/or abilities. Conversely, women's experiences were often shaped by how pornography had affected the way that men related to them sexually. Their experiences included instances of sexual coercion and assault which were not reported by the men. These findings signal the need for a gendered lens, situated within a broader harms-based perspective, in examinations of pornography's influence.

This chapter examines the phenomenon of internet users attempting to report and prevent online child sexual exploitation (CSE) and child sexual abuse material (CSAM) in the absence of adequate intervention by internet service providers, social media platforms, and government. The chapter discusses the history of online CSE, focusing on regulatory stances over time in which online risks to children have been cast as natural and inevitable by the hegemony of a “cyberlibertarian” ideology. We illustrate the success of this ideology, as well as its profound contradictions and ethical failures, by presenting key examples in which internet users have taken decisive action to prevent online CSE and promote the removal of CSAM. Rejecting simplistic characterizations of “vigilante justice,” we argue instead that the fact that often young internet users report feeling forced to act against online CSE and CSAM undercuts libertarian claims that internet regulation is impossible, unworkable, and unwanted. Recent shifts toward a more progressive ethos of online harm minimization are promising; however, this ethos risks offering a new legitimizing ideology for online business models that will continue to put children at risk of abuse and exploitation. In conclusion, we suggest ways forward toward an internet built in the interests of children, rather than profit.

There are over 40 million amputees globally with more than 185,000 Americans losing their limbs every year. For most of the world, prosthetic devices remain too expensive and uncomfortable. This paper aims to outline advancements made by a multidisciplinary research group, interested in advancing the restoration of human motion through accessible lower limb prostheses.

Customization, comfort and functionality are the most important metrics reported by prosthetists and patients. The work of this paper presents the design and manufacturing of a custom made, cost-effective and functional three-dimensional (3D) printed transtibial prosthesis monocoque design. The design of the prosthesis integrates 3D imaging, modelling and optimization techniques coupled with additive manufacturing.

The successful fabrication of a functional monocoque prosthesis through 3D printing indicates the workflow may be a solution to the worldwide accessibility crisis. The digital workflow developed in this work offers great potential for providing prosthetic devices to rural communities, which lack access to skilled prosthetic physicians. The authors found that using the workflow together with 3D printing, this study can create custom monocoque prostheses (Figure 16). These prostheses are comfortable, functional and properly aligned. In comparison with traditional prosthetic devices, the authors slowered the average cost, weight and time of production by 95%, 55% and 95%, respectively.

This novel digital design and manufacturing workflow has the potential to democratize and globally proliferate access to prosthetic devices, which restore the patient’s mobility, quality of life and health. LIMBER’s toolbox can reach places where proper prosthetic and orthotic care is not available. The digital workflow reduces the cost of making custom devices by an order of magnitude, enabling broader reach, faster access and improved comfort. This is particularly important for children who grow quickly and need new devices every few months or years, timely access is both physically and psychologically important.

In this manuscript, the authors show the application of digital design techniques for fabricating prosthetic devices. The proposed workflow implements several advantageous changes and, most importantly, digitally blends the three components of a transtibial prosthesis into a single, 3D printable monocoque device. The development of a novel unibody transtibial device that is properly aligned and adjusted digitally, greatly reduces the number of visits an amputee must make to a clinic to have a certified prosthetist adjust and modify their prosthesis. The authors believe this novel workflow has the potential to ease the worldwide accessibility crisis for prostheses.