bluuebunny/crossref_metadata_2025_split huggingface dataset:
Weld quality inspection of small-diameter thin-walled pipes by a laser ultrasonic method
Authors: Liu Jiujian , Feng Xuehan , Yin Anmin , Cheng Liping , Fan Li , Xu Xiaodong , Zhang Shuyi 
Published: March 2020

Defect inspection of small-diameter thin-walled pipes is a difficult problem in the field of nondestructive testing. In this paper, a new detection method based on laser ultrasonics and guided circumferential wave technology is proposed and used to inspect the defects in pipes. First, a theoretical model based on the theory of acoustic propagation in solids is proposed for the small-diameter thin-walled pipes. The dispersion characteristics of the guided circumferential waves of thin-walled pipes are obtained by numerical simulation. Second, a laser ultrasonic system is constructed and used to detect the flaws in the small-diameter thin-walled pipes. Finally, the laser ultrasonic system is used to analyze the welding quality of stainless steel pipes with a diameter of 4.20 mm and a wall thickness of 0.30 mm. The experimental results are in agreement with the theoretical analysis, which demonstrates the reliability and practicability of the laser ultrasonic method in the weld quality inspection of small-diameter thin-walled pipes.
Listening and hearing Carmen: Sonic cartographies of struggle in U-Carmen eKhayelitsha (2005)
Authors: Himmelman Natasha 
Published: March 2020

Abstract
Situating within a diasporic genealogy of black opera that privileges black sonic/aural epistemologies, I am interested in how these knowledges 'disidentify' racialized and gendered hermeneutics of sounding and listening. Through the lens of , I centre black women's cartographies, imagining the black singing voice as, not only soundscape, but a uniquely embodied black geography. Identifying Carmen's singing voice as an embodied black geography, I discuss the sonic cartographies in U-Carmen through close readings of the film's opening and finale, as well as 'La Habanera'/ 'Lwaz'Uthando'. Embracing isiXhosa with Georges Bizet's score, the film struggles against the sonic colour line, challenging and recalibrating our listening ear. Within this soundscape, U-Carmen responds to the patriarchally imagined femme fatale, presenting a Carmen who struggles against gender-based violence.
Filming the invisible: Rubrics of ordinary life in Stories of Our Lives (2014)
Authors: Ombagi Eddie 
Published: March 2020

Abstract
In this article, I offer a reading of , a documentary about the experiences of queer people who live in the city of Nairobi. I am interested in how through the use of the documentary film, the director of the film and the queer people whose lives are represented, articulate new forms of inhabiting and being in the city. This is despite the legal and political hurdles that govern queer liveability in Kenya. I argue that when queer individuals inhabit, move through, move in, occupy or transit through city spaces in their daily habits, practices, rituals and performances, a rubric is generated. As a form, this rubric of ordinary also works both in, and outside of the convention of the documentary film. This rubric not only destabilizes the circulating discourses about queer sexuality, it also crafts a unique queer subjectivity that transcends the physical limitations of the city that enliven forms of queer world making
The casebre on the sand: Reflections on Luanda's excepted citizenship through the cinematography of Maria João Ganga's Na Cidade Vazia (2004)
Authors: Mututa Addamms 
Published: March 2020

Abstract
This article discusses Maria João Ganga's representations of musseques and the casebre in Na Cidade Vazia (2004). It reads such images and characterization of neglected characters as visual expressions of the way in which Luanda's informal spaces have become the most visible expression of precarious, indeed, excepted citizenship. Set in 1991, the film depicts a period during which the government and the rebels entered a temporary truce, which rapidly disintegrated, gesturing towards a continuing sense of exclusion from postcolonial prosperity. However, the bloody civil war that ensued between rival factions (1975–2002) – the governing Movimento Popular de Libertação de Angola (MPLA), led by Jose Eduardo dos Santos, and União Nacional para a Independência Total de Angola (UNITA), led by Jonas Savimbi – remarkably shifted the way post-Portuguese citizenship in Angola could be discussed. It clearly necessitates a new way of thinking about inclusion with respect to the incipient repercussions of indeterminate governance. In the context of this historical process, this article uses exception as a lens to conceptualize postcolonial urban citizenship in Luanda's cinema. The article sets off with an overview of 1975 literary imaginations of Luanda when the Portuguese colonialists were leaving Angola, which resulted in a clamour for the so-called spoils of independence. It then critiques excepted citizenship using two approaches: analysing urban architecture as a visual code for precariousness and filmic characters as embodiments of excepted citizenship.
Endogenous Authority and Enforcement in Public Goods Games
Authors: Lim Wooyoung , Zhang Jipeng 
Published: March 2020

AbstractThis paper investigates theoretically and experimentally the social benefits and cost to have an endogenous punishment-enforcing authority in public goods game. An authority is chosen among members of a society via an imperfectly discriminating contest prior to a public goods game. Once chosen the authority has a large degree of discretion to inflict punishment. Our theoretical result shows that an efficiency gain from having the endogenous authority always comes with a social cost from competing for being the authority. The larger the society is, however, the bigger the efficiency gain and the smaller the rent dissipation. The completely efficient outcome can be approximated as the size of society tends to infinity. The experimental results confirm that the presence of endogenous authority for a given group size increases the public goods contributions and the efficiency gain is significantly bigger in a larger group.
Service Composition in IoT using Genetic algorithm and Particle swarm optimization
Authors: Kashyap Neeti , Kumari A. Charan , Chhikara Rita 
Published: March 2020

AbstractWeb service compositions are commendable in structuring innovative applications for different Internet-based business solutions. The existing services can be reused by the other applications via the web. Due to the availability of services that can serve similar functionality, suitable Service Composition (SC) is required. There is a set of candidates for each service in SC from which a suitable candidate service is picked based on certain criteria. Quality of service (QoS) is one of the criteria to select the appropriate service. A standout amongst the most important functionality presented by services in the Internet of Things (IoT) based system is the dynamic composability. In this paper, two of the metaheuristic algorithms namely Genetic Algorithm (GA) and Particle Swarm Optimization (PSO) are utilized to tackle QoS based service composition issues. QoS has turned into a critical issue in the management of web services because of the immense number of services that furnish similar functionality yet with various characteristics. Quality of service in service composition comprises of different non-functional factors, for example, service cost, execution time, availability, throughput, and reliability. Choosing appropriate SC for IoT based applications in order to optimize the QoS parameters with the fulfillment of user’s necessities has turned into a critical issue that is addressed in this paper. To obtain results via simulation, the PSO algorithm is used to solve the SC problem in IoT. This is further assessed and contrasted with GA. Experimental results demonstrate that GA can enhance the proficiency of solutions for SC problem in IoT. It can also help in identifying the optimal solution and also shows preferable outcomes over PSO.
Experimental Study of the Effectiveness of a Combined Closure of the End Gate Pipeline Valve
Authors: Herasymov Henrikh H. , Gerasimov Ievgenii G. , Ivanov Sergiy Y. , Pinchuk Oleg L. 
Published: March 2020

Abstract
One of the ways to ensure a reliable operation of irrigation systems is to protect them from water hammer (hydraulic shock) damage that occurs when starting or stopping a pumping station. This can be achieved by creating conditions in which a water hammer will not occur in the pressure pipeline as a result of closing the end gate valve (EGV). The aim of the present study was to investigate processes occurring in the pipeline during a linear closure of the EGV, during a closure with one break point and during an intermittent closure, as well as to verify the effectiveness of a combined end gate valve closure of the pipeline. Based on experimental data and calculations, the article recommends a linear closure of the EGV with one break point.
From giant despair to a new heaven: The early years of automatic collation
Authors: Nury Elisa , Spadini Elena 
Published: March 2020

Abstract
This article presents a commented history of automatic collation, from the 1940s until the end of the twentieth century. We look at how the collation was progressively mechanized and automatized with algorithms, and how the issues raised throughout this period carry on into today’s scholarship. In particular, we examine the inner workings of early collation algorithms and their different steps in relation to the formalization of the Gothenburg Model. The scholars working with automatic collation also offer fascinating insights to study the collaborations between Humanists and Computer Scientists, and the reception of computers by philologists.
Extended Nonequilibrium Variables for 1D Hyperbolic Heat Conduction
Authors: Sobolev Sergey L. , Kudinov Igor V. 
Published: March 2020

Abstract
We use the Shannon (information) entropy to define an “entropic” temperature for 1D nonequilibrium system with heat flux. In contrast to the kinetic temperature, which is related to the average kinetic energy, the nonequilibrium entropic temperature is related to the changes in entropy and serves as a criterion for thermalization. However, the direction and value of the heat flux is controlled by the gradient of the kinetic temperature, whereas space-time evolution and the space-time evolution of the heat flux are governed by the hyperbolic heat conduction equation. The extended nonequilibrium variables, namely, entropy, entropic temperature, thermal conductivity, and heat capacity demonstrate a third-law-like behavior at high deviation from equilibrium when the heat flux tends to its maximum value, even at nonzero value of the kinetic temperature. The ratio of the heat flux to its maximum possible value plays a role of an order parameter – it varies from zero in the equilibrium (disordered) state to unity in the nonequilibrium (ordered) state.
Optimization of an EYDWA Amplifier Parameters for a Gigabit Passive Optical Network (GPON)
Authors: Berrahal B.A. , Anani M. , Bendaoudi A. 
Published: March 2020

Abstract
The purpose of this study is to evaluate the impact of the location of the Er3+/Yb3+optical amplifier (EYDWA) in passive optical access network downstream (as a post-amplifier or booster, in the middle) and upstream transmission . This can give us an extended connection and a huge distribution ratio for a beneficial implementation of the optical fiber. The transmission quality was compared on the location of the amplifier as well as the length of the link. According to the results obtained by system simulation one noted that there is a clear improvement of the system performance by the effect of the amplifier (EYDWA). One could obtain a distance of more than 200 km for GPON. Moreover by varying the opto-geometric parameters such as concentration of Ytterbium ions and the length of the guide allowed us to improve the quality factor and binary error rate.
E-Entrepreneurship and Economic Development: the Case of EU Countries
Authors: Rusu Valentina Diana , Roman Angela 
Published: March 2020

AbstractThe aim of our paper is to identify how entrepreneurs from European Union (EU) countries use information and communications technologies (ICTs) in their business activities. We also propose to identify if there are differences in the use of ICTs by entrepreneurs, according to level of economic development of EU countries. In order to achieve these goals, we analyse a sample of EU countries, by including them into two groups, according to the stage of their economic development. For analysing the data, we use several methods (the logical-constructive method, comparative methods and benchmarking). The benchmarking method helps us to estimate indicators at country level and to compare them between countries. Our results indicate that e-entrepreneurship in developed countries is more advanced compared to developing countries. There are also significant differences regarding the use of informational technologies between types of firms by their size. Small enterprises use in a lower proportion ICTs in their activity compared with large firms. Through the content of our research, we emphasize that in order to adapt to the rapid changing environment and also to the changes in the consumer’s behaviour the enterprises should focus on introducing the ICTs in their activity to face the competition. Also, government policies should pay more attention to supporting development of information technology infrastructure.
Crystal structure of mechanochemically synthesized Ag2CdSnS4
Authors: Heppke Eva M. , Berendts Stefan , Lerch Martin 
Published: March 2020

Abstract
Ag2CdSnS4 was synthesized by a two step mechanochemical synthesis route. From a detailed analysis of the observed reflections in the X-ray powder diffraction pattern, the crystal structure proposed in the literature (space group Cmc21 [E. Parthé, K. Yvon, R. H. Deitch, Acta Crystallogr.
1969, B25, 1164–1174; O. V. Parasyuk, I. D. Olekseyuk, L. V. Piskach, S. V. Volkov, V. I. Pekhnyo, J. Alloys Compd.
2005, 399, 173–177]) is questionable. Our structural investigations presented in this contribution point to the fact that Ag2CdSnS4 crystallizes in the monoclinic wurtzkesterite-type structure (space group Pn). At around T = 200°C, a phase transition to the orthorhombic wurtzstannite-type structure (space group Pmn21) is observed.
Smart Machining Process Monitoring Enabled by Contextualized Process Profiles for Synchronization
Authors: Wang Zhigang , Wagner Timothy C. , Guo Changsheng 
Published: March 2020

Abstract
Repeated machine downtime leads to lost productivity, late deliveries, and dissatisfied customers. Plants often struggle with meeting delivery commitment because they lack advanced predictive technologies. Because of limited information from current production practice, it is very challenging to control product quality, meet the tight tolerance, and eliminate scrap parts, which is especially critical for expensive aeroengine components. With the recent development of Industrial Internet of Things and Operation Technologies, it is now feasible to digitize the production process and take machine reliability and performance to a new level. In this study, the machining process is simulated in the virtual environment, and the output response is used as a reference digital thread of the process. In real-time machining, the computer numerical control (CNC) control signals together with existing machinery sensors and historical data are monitored and fused together to observe the machining conditions. Comparing the reference signature with supervised machine learning analytics, any subtle deviations in operating behavior, which are often the early warning signs of problems, can be identified. Also, with the look-ahead function, it gives the operators better visibility into the machining process. With the proposed method, without adding any more hardware to existing production machineries, it is feasible to capture data in real time, conduct automated analysis of the information, and create visualizations for team members. Plus, the real-time monitoring of any deviation in operating behavior during production can protect machine and cutting tools from excessive load and damage, thereby reducing operating costs and increasing effective manufacturing capacity.
Effect of Vegetable Oil–Based Hybrid Nano-Cutting Fluids on Surface Integrity of Titanium Alloy in Machining Process
Authors: Pasam Vamsi Krishna , Neelam Parimala 
Published: March 2020

Abstract
In the present work, an attempt is made to examine the machining performance in turning titanium alloy using vegetable oil–based hybrid nano-cutting fluids. The sesame oil–based hybrid nanofluids with carbon nanotubes (CNT)/molybdenum disulphide (MoS2) in the ratio of 1:2 are used to test the effect of surface integrity in the machining of titanium alloy. The cutting forces, cutting temperatures, surface roughness, and microhardness of the machined surface were measured. The machined surface is analyzed for machining-induced residual stresses and changes in the surface topography. Machining performance improved with vegetable oil–based hybrid nano-cutting fluids in reducing cutting forces and cutting temperatures. The percentage reduction of temperatures in the cutting zone under 0.5, 1, 1.5, and 2 wt. % and conventional cutting fluids (CCFs) are 70.2, 58.2, 63.1, 67.3, and 56.7, respectively, compared with dry machining. The percentage reduction in cutting forces are found to be 39.4, 70.9, 42.7, 73.2, and 72.3 for CCF 0.5, 1, 1.5, and 2 wt. % nanoparticle inclusions (NPI) compared with dry cutting, respectively. The percentage reduction in surface roughness (Ra) under CCF is 9.6, 24.4, 23.2, 22.4, and 26.7 for 0.5, 1, 1.5, and 2 wt. % NPI respectively, compared with dry cutting. The microhardness of the machined surface increased, and residual stresses are encouraging with hybrid nano-cutting fluids.
Probiotics in Psychosocial Stress and Anxiety. A Systematic Review
Authors: Vitellio Paola , Chira Alexandra , De Angelis Maria , Dumitrascu Dan L , Portincasa Piero 
Published: March 2020

Background and Aims: Recent mounting evidence suggest that probiotics supplementation can have a positive effect on mood and psychological symptoms such as stress and anxiety disorders. The majority of studies, however, rely on animal models, while clinical data are still inconsistent. In this systematic review, we examined if and to which extent probiotics can influence psychological stress and anxiety disorders.
Methods: The search of online databases Medline, PubMed, Scopus, Web of Science and clinical trials.gov provided relevant studies up to November 2019. We included double blind, randomized and placebo controlled or prospective studies, as well as studies measuring preclinical psychological symptoms of perceived stress and anxiety, before and after supplementation with a probiotic.
Results: Twelve studies met the inclusion criteria (3 on stress, 4 on anxiety, and 5 both on stress and anxiety), accounting for 1,521 participants. The improvement of stress, anxiety, and stress-anxiety was reported in 1/3, 3/4, and 2/5 studies, respectively.
Conclusions: Available studies suggest that probiotics may improve psychological symptoms associated particularly with anxiety. Further research needs to investigate whether probiotics also improve psychological stress disturbances.
Onset and Progression of Precancerous Lesions on Gastric Mucosa of Patients Treated for Gastric Lymphoma
Authors: Zullo Angelo , Rago Angela , Felici Stefano , Licci Stefano , Ridola Lerenzo , Caravita di Toritto Tommaso 
Published: March 2020

Background and Aims: Patients with primary gastric lymphoma are at an increased risk of developing gastric cancer. Data on gastric precancerous lesions development in these patients are scanty. We assessed gastric precancerous lesions in a cohort of patients with primary lymphoma.
Methods: Data of patients with primary gastric lymphoma [mucosa-associated lymphoid tissue (MALT)- lymphoma or diffuse large B-cell lymphoma (DLBCL)] were analysed. Multiple (>10) biopsies were performed on gastric mucosa at each endoscopic control, beyond macroscopic lesions. Presence and distribution of intestinal metaplasia (IM) at baseline, the onset at follow-up, and progression through the stomach or transformation in the incomplete IM type were assessed. The onset of neoplastic lesions was recorded.
Results: Data of 50 patients (mean age of 63.6 ± 10.7 years; M/F: 25/25), including 40 with MALT-lymphoma and 10 with DLBCL, with median follow-up of 30.5 months (range: 9-108) and a median of 6 endoscopic controls (range: 3-14) were evaluated. At entry, IM was present in 12 (24%), and it developed in other 22 (57.9%) patients at a median follow-up of 6 (range: 3-40) months. Overall, progression of IM was observed in 7 (21.2%) cases, including extension in the stomach (n=5) or transformation into the incomplete type (n=2). Low-grade dysplasia was detected in 4, and indefinite dysplasia in other 7 patients. In one patient, low-grade dysplasia had progressed to high-grade and gastric adenocarcinoma of the fundus.
Conclusions: Our data found a frequent onset and rapid progression of precancerous lesions on gastric mucosa of lymphoma patients. This observation could explain the increased incidence of metachronous gastric cancer in these patients.
Nonalcoholic Fatty Liver Disease as a Risk Factor for Prolonged Corrected QT Interval in Apparently Healthy Korean Women
Authors: Chung Tae-Ha , Shim Jae-Yong , Lee Yong-Jae 
Published: March 2020

Background and Aims: Nonalcoholic fatty liver disease (NAFLD) is clinically important because of its association with an increased risk of sudden cardiac death as well as liver-related mortality. Most cases of sudden cardiac death could be mediated by an arrhythmogenic process. Thus, we aimed to determine the association between NAFLD and corrected QT (QTc) interval in apparently healthy Korean women.
Methods: This cross-sectional study included 764 women aged 20 to 74 years old who underwent a health examination program between 2014 and 2015. The QTc interval was calculated using Bazett’s formula (QTc = QT/√RR). Multiple linear and logistic regression analysis were performed to assess independent relationships between NAFLD and QTc interval and prolonged QTc (≥ 450 milliseconds) was calculated after adjusting for confounding variables.
Results: The overall prevalence of NAFLD was 23.5% in general healthy women. The standardized β coefficient (95% confidence interval) of the QTc increment in patients with NAFLD was 6.4 milliseconds (1.2–11.8) through multiple linear regression analysis after adjusting for age, body mass index, smoking status, and regular exercise as well as mean arterial pressure, fasting plasma glucose, triglycerides, high-density lipoprotein cholesterol, aspartate aminotransferase, alanine aminotransferase, calcium, potassium levels and menopause status. Similarly, the odds ratio (95% confidence interval) of NAFLD for prolonged QTc was 2.05 (1.13–3.71) according to multiple logistic regression analysis after adjusting for the same covariables in women aged 20 to 74 years old.
Conclusion: We demonstrated the arrhythmogenic potential of NAFLD, implying that careful monitoring of patient electrocardiograms is necessary to evaluate the possible arrhythmic risk in general healthy women with NAFLD.