bluuebunny/crossref_metadata_2025 huggingface dataset:
Validity and Reliability of the Polish Adaptation of the CHAMPS Physical Activity Questionnaire
Authors: Król-Zielińska Magdalena , Ciekot-Sołtysiak Monika , Szeklicki Robert , Zieliński Jacek , Osiński Wiesław , Kantanista Adam
Published: March 2019

The aim of the study was to investigate the reliability and construct validity of the Polish adaptation of the Community Health Activities Model Program for Seniors (CHAMPS) physical activity questionnaire among the elderly. The sample included 104 volunteers, 75 women (age = 71.0 ± 5.0 years) and 29 men (age = 75.1 ± 6.6 years). To assess the reliability of the Polish version of the CHAMPS physical activity questionnaire, measurements were conducted by one-week test-retest. The construct validity of the CHAMPS physical activity questionnaire was evaluated using accelerometers. Criterion validation was verified by self-reported measurements (health self-assessment, life satisfaction, and wellbeing) and body composition analysis. Intraclass correlation coefficients of the one-week test-retest ranged from 0.79 to 0.85. Significant Pearson’s correlations were found between caloric expenditure measured by accelerometer and CHAMPS caloric expenditure in all listed physical activities (r = 0.33) and caloric expenditure in at least moderate intensity physical activities (r = 0.37) of the CHAMPS physical activity questionnaire. Moderate and greater intensity physical activities of CHAMPS measure were significantly related to total bone mass, health self-assessment, life satisfaction as a whole, and personal wellbeing (r ranged from 0.26 to 0.34). The findings of the study allow us to conclude that the Polish version of the CHAMPS physical activity questionnaire has acceptable reliability and validity to assess physical activity of older adults.
A Case of Polymicrobial, Gram-Negative Pulmonic Valve Endocarditis
Authors: Bekker Tatiana , Govind Anusha , Weber Devin M.
Published: March 2019

Infective endocarditis due to Gram-negative, non-HACEK bacteria is a rare clinical entity. Even moreso, isolated pulmonic valve endocarditis accounts for less than 1.5–2% of all cases of infective endocarditis. These disease pathologies commonly occur in the setting of intravenous drug abuse, indwelling catheters or cardiac devices, or underlying structural heart disease. We present a unique case of pulmonic valve endocarditis in the setting of persistent polymicrobial bacteremia with Klebsiella pneumoniae and Citrobacter koseri with recent gastrointestinal instrumentation evolving into isolated pulmonic valve endocarditis.
Experimental Analysis on Permeability Characteristics of Iron Tailings
Authors: Gan Deqing , Yang Xi , Zhang Yunpeng
Published: March 2019

The permeability characteristics of iron tailings are one of the important factors affecting the stability of the tailings dam. The permeability properties of undisturbed iron tailings and disturbed iron tailings were analyzed from various aspects such as FC value, gradation, particle size, specific surface area, and interparticle void ratio with water head test in laboratory. The results show that the permeability coefficients of undisturbed iron tailings and disturbed iron tailings are affected by the fine particles content (FC). The threshold of fine content is about 40%. The traditional formulas for calculating the permeability coefficient are applied. But the results are inaccurate. The relationship between permeability coefficient of the iron tailings (undisturbed iron tailings and disturbed iron tailings) and the nonuniform coefficient (Cu), the curvature coefficient (Cc), the average particle size, the weighted average particle size, the specific surface area, and the skeleton void ratio (es) is nonlinear. It is difficult to characterize the change of permeability coefficient when the fine content is large. However, the relationship between permeability coefficient of the iron tailings (undisturbed iron tailings and disturbed iron tailings) and the effective particle size and silt particles void ratio (ef) is linear. A formula was developed for the determination of permeability coefficient of iron tailings by analyzing the effective particle size and silt particles void ratio. And it is more accurate. The permeability coefficients of disturbed samples are slightly larger than the permeability coefficients of undisturbed sample. This is due to the destruction of the sedimentary structure of the tailings and increasing e. Maybe the R in the new formula is affected by the structure of iron tailings. This requires further research.
Erythrodermic Psoriasis Causing Uric Acid Crystal Nephropathy
Authors: Ellis John , Lew Jeffrey , Brahmbhatt Sumir , Gordon Sarah , Denunzio Troy
Published: March 2019

Background. Erythrodermic psoriasis is a rare and severe variant of psoriasis. It is characterized by widespread skin erythema, scaling, pustules, or exfoliation of more than 75% of the body’s surface area. This condition has life-threatening complications to include hemodynamic, metabolic, immunologic, and thermoregulatory disturbances. One metabolic complication, hyperuricemia, occurs from rapid keratinocyte differentiation and infiltration of inflammatory cells into psoriatic lesions. Although renal injury caused by shunting of blood to the skin has been reported, there are no reports of erythrodermic psoriasis causing crystal-induced nephropathy. We present a case of erythrodermic psoriasis and hyperuricemia complicated by uric acid crystal nephropathy. Case Presentation. A 57-year-old male with long-standing psoriatic arthritis presented with diffuse scaling of his skin. He was being treated with adalimumab, leflunomide, and topical clobetasol, but had recently stopped taking his medications. Physical exam revealed yellow scaling covering his entire body with underlying erythema and tenderness without mucosal involvement. Labs were notable for a creatinine of 3.3 mg/dL, with no prior history of renal disease, and uric acid of 12.7 mg/dL. He was admitted to the intensive care unit given >80% of body surface area involvement and acute renal failure. Despite aggressive fluid resuscitation, renal function did not improve, and creatinine peaked at 4.61 mg/dL. Urine microscopy showed diffuse polymorphic uric acid crystals, consistent with uric acid crystal-induced nephropathy. He was started on rasburicase, urinary alkalinization, and fluids. His renal function improved dramatically; urine output, uric acid, and electrolytes normalized. He was discharged on topical clobetasol and leflunomide and started on secukinumab with little to no skin involvement. Conclusion. This case presents the rare complication of crystal-induced nephropathy in a patient with erythrodermic psoriasis. Uric acid crystal nephropathy is well described in diseases with rapid cell turnover such as tumor lysis syndrome. It is thought that rapid keratinocyte differentiation and inflammatory infiltration of psoriatic lesions produced life-threatening electrolyte abnormalities similar to tumor lysis syndrome. Early recognition of this rare complication is critical, and aggressive fluid resuscitation, urine alkalinization, and uric acid lowering agents should be administered immediately.
Otitis Media: Long-Term Effect on Central Auditory Nervous System
Authors: Colella-Santos Maria Francisca , Donadon Caroline , Sanfins Milaine Dominici , Borges Leticia Reis
Published: March 2019

Objectives.To analyze the central auditory nervous system function through behavioral and electrophysiological tests in children with a history of otitis media and subsequent bilateral tubes placement surgery.Methods.The participants were divided into two groups between eight and 14 years old: control group (CG) consisted of 40 children with no history of otitis media; experimental group (EG) consisted of 50 children with documented history of otitis media and undertook a surgery for bilateral tubes placement. All children completed audiological evaluation (audiometry, speech audiometry, and immittance audiometry), behavioral evaluation (tests: dichotic digits, synthetic sentence identification with ipsilateral competing message, gaps-in-noise, frequency pattern), and electrophysiological evaluation (Auditory Brainstem Response, ABR, Frequency Following Response, FFR (verbal), and Long Latency Auditory Evoked Potential, LLAEP).Results.The EG group showed significantly poorer performance (p<0.001) than the CG for all auditory abilities studied. The results revealed significant latency delays and reduced amplitude (p<0.05) of waves III and V for ABR; significant latency delay was seen of potentials P2, N2, and P300 for LLAEP; significant latency delays and reduced amplitude (p<0.05) were observed for FFR in children with a history of otitis media.Conclusion.The results demonstrate negative effect of otitis media in the auditory abilities and electrophysiological measures in children with a history of otitis media.
A copa do mundo de 2014 na cidade de São Paulo: as transformações na estrutura urbana de Itaquera
Authors:   Universidade de São Paulo. Faculdade de Filosofia, Letras e Ciências Humanas, Vasconcelos Daniel Bruno
Published: March 2019

Este trabalho visa analisar as transformações espaciais no período pré-Copa do Mundo de 2014 na cidade de São Paulo, principalmente na área de Itaquera. O impacto da construção do estádio “Itaquerão”, do Sport Club Corinthians Paulista e das obras do Polo Institucional de Itaquera para a Copa do Mundo está no plano principal dessa pesquisa. A Copa do Mundo estabelece um conjunto de iniciativas de reforma urbana que altera formas e fluxos em um curto período, justificado pelo evento internacional. Em meio à requalificação do bairro, definem-se critérios de adequação que podem servir de modelo para outras intervenções em espaços periféricos. No intuito de detalhá-los, foi elaborado um plano de trabalho para delimitar o objeto de estudo. O projeto desta pesquisa teve como objetivo geral retomar a discussão das transformações no espaço urbano, mas, dessa vez, destacando um momento diferenciado de investimentos e expansão do capital na periferia de São Paulo. Na tentativa de compreender as transformações no espaço urbano, utilizamos o método materialista histórico dialético.
Emerging Magnetic Resonance Imaging Techniques for Atherosclerosis Imaging
Authors: Wüst Rob C.I. , Calcagno Claudia , Daal Mariah R.R. , Nederveen Aart J. , Coolen Bram F. , Strijkers Gustav J.
Published: March 2019

Atherosclerosis is a prevalent disease affecting a large portion of the population at one point in their lives. There is an unmet need for noninvasive diagnostics to identify and characterize at-risk plaque phenotypes noninvasively and in vivo, to improve the stratification of patients with cardiovascular disease, and for treatment evaluation. Magnetic resonance imaging is uniquely positioned to address these diagnostic needs. However, currently available magnetic resonance imaging methods for vessel wall imaging lack sufficient discriminative and predictive power to guide the individual patient needs. To address this challenge, physicists are pushing the boundaries of magnetic resonance atherosclerosis imaging to increase image resolution, provide improved quantitative evaluation of plaque constituents, and obtain readouts of disease activity such as inflammation. Here, we review some of these important developments, with specific focus on emerging applications using high-field magnetic resonance imaging, the use of quantitative relaxation parameter mapping for improved plaque characterization, and novel
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F magnetic resonance imaging technology to image plaque inflammation.
Accuracy of Clinical Diagnostic Criteria for Patients With Vascular Ehlers-Danlos Syndrome in a Tertiary Referral Centre
Authors: Henneton Pierrick , Albuisson Juliette , Adham Salma , Legrand Anne , Mazzella Jean Michael , Jeunemaitre Xavier , Frank Michael
Published: March 2019

Background:

Vascular Ehlers-Danlos syndrome is a rare inherited connective tissue disease secondary to mutations within the COL3A1 gene. The diagnosis of vascular Ehlers-Danlos syndrome is challenging, and patient selection for genetic testing relies on diagnostic criteria, which have never been evaluated.

Methods:

All patients seen at a dedicated tertiary referral center for a suspicion of vascular Ehlers-Danlos syndrome between January 2001 and March 2016 were retrospectively included in a diagnostic accuracy study. Major and minor diagnostic criteria of the Villefranche classification were tested for sensitivity, specificity, positive and negative predictive values, according to results of genetic testing.

Results:

N=519 patients were eligible for analysis dividing into n=384 probands and n=135 relatives. A pathogenic COL3A1 variant was identified in n=165 (31.8%) patients. The Villefranche criteria were met for n=248 patients with a sensitivity of 79% (95% CI, 0.72–0.85) and a negative predictive value of 87% (95% CI, 0.83–0.91). Diagnostic accuracy was highest for symptomatic probands (sensitivity 92%; negative predictive value 95%) with limited specificity (60%). Probands ≤25 years had the worst diagnostic performance. The revised diagnostic Criteria (2017) were less accurate than the Villefranche classification (overall diagnostic odds-ratio, 4.17 versus 7.8; probands diagnostic odds-ratio, 4.04 versus 18.1; and probands ≤25 years diagnostic odds-ratio, 2.36 versus 5.1) mainly due to a lack of sensitivity.

Conclusions:

The Villefranche criteria provide accurate detection of symptomatic probands in specialized practice but have limited specificity. The revised diagnostic criteria for vascular Ehlers-Danlos syndrome have increased specificity, but its overall performance is poorer. The early clinical diagnosis of probands without family history is not addressed by both diagnostic classifications.
Treatment of Resistant and Refractory Hypertension
Authors: Acelajado Maria Czarina , Hughes Zachary H. , Oparil Suzanne , Calhoun David A.
Published: March 2019

Resistant hypertension (RHTN) is defined as uncontrolled blood pressure despite the use of ≥3 antihypertensive agents of different classes, including a diuretic, usually thiazide-like, a long-acting calcium channel blocker, and a blocker of the renin- angiotensin system, either an ACE (angiotensin-converting enzyme) inhibitor or an ARB (angiotensin receptor blocker), at maximal or maximally tolerated doses. Antihypertensive medication nonadherence and the white coat effect, defined as elevated blood pressure when measured in clinic but controlled when measured outside of clinic, must be excluded to make the diagnosis. RHTN is a high-risk phenotype, leading to increased all-cause mortality and cardiovascular disease outcomes. Healthy lifestyle habits are associated with reduced cardiovascular risk in patients with RHTN. Aldosterone excess is common in patients with RHTN, and addition of spironolactone or amiloride to the standard 3-drug antihypertensive regimen is effective at getting the blood pressure to goal in most of these patients. Refractory hypertension is defined as uncontrolled blood pressure despite use of ≥5 antihypertensive agents of different classes, including a long-acting thiazide-like diuretic and an MR (mineralocorticoid receptor) antagonist, at maximal or maximally tolerated doses. Fluid retention, mediated largely by aldosterone excess, is the predominant mechanism underlying RHTN, while patients with refractory hypertension typically exhibit increased sympathetic nervous system activity.
Adherence in Hypertension
Authors: Burnier Michel , Egan Brent M.
Published: March 2019

The global epidemic of hypertension is largely uncontrolled and hypertension remains the leading cause of noncommunicable disease deaths worldwide. Suboptimal adherence, which includes failure to initiate pharmacotherapy, to take medications as often as prescribed, and to persist on therapy long-term, is a well-recognized factor contributing to the poor control of blood pressure in hypertension. Several categories of factors including demographic, socioeconomic, concomitant medical-behavioral conditions, therapy-related, healthcare team and system-related factors, and patient factors are associated with nonadherence. Understanding the categories of factors contributing to nonadherence is useful in managing nonadherence. In patients at high risk for major adverse cardiovascular outcomes, electronic and biochemical monitoring are useful for detecting nonadherence and for improving adherence. Increasing the availability and affordability of these more precise measures of adherence represent a future opportunity to realize more of the proven benefits of evidence-based medications. In the absence of new antihypertensive drugs, it is important that healthcare providers focus their attention on how to do better with the drugs they have. This is the reason why recent guidelines have emphasize the important need to address drug adherence as a major issue in hypertension management.
Hypertension Management in Older and Frail Older Patients
Authors: Benetos Athanase , Petrovic Mirko , Strandberg Timo
Published: March 2019

The prevalence of arterial hypertension, particularly systolic hypertension, is constantly rising worldwide. This is mainly the clinical expression of arterial stiffening as a result of the population’s aging. Chronic elevation in blood pressure represents a major risk factor not only for cardiovascular morbidity and mortality but also for cognitive decline and loss of autonomy later in life. Clinical evidence obtained in community-dwelling older people with few comorbidities and preserved autonomy supports the beneficial effects of lowering blood pressure in older hypertensive subjects even after the age of 80 years. However, observational studies in frail older individuals treated for hypertension have shown higher morbidity and mortality rates compared with those with lower blood pressure levels. Clearly, in very old subjects, the therapeutic strategy of one size fits all cannot be applied because of the enormous functional heterogeneity in these individuals. Geriatric medicine proposes taking into account the function/frailty/autonomy status of older people. In the present review, we propose to adapt the antihypertensive treatment using an easy-to-apply visual numeric scale allowing the identification of 3 different patient profiles according to the functional status and autonomy for activities of daily living. For the preserved function profile, strategies should be those proposed for younger old adults. For the loss of function/preserved activities of daily living’ profile, a more detailed geriatric assessment is needed to define the benefit/risk balance as well as requirements for the tailoring of the various therapeutic strategies. Lastly, for the loss of function and altered activities of daily living’ profile, therapeutic strategies should be thoroughly reassessed, including deprescribing (when considered appropriate). In the near future, controlled trials are necessary for the most frail older subjects (ie, in those systematically excluded from previous clinical trials) to gain stronger evidence regarding the benefits of the various therapeutic strategies.
Preeclampsia
Authors: Rana Sarosh , Lemoine Elizabeth , Granger Joey P. , Karumanchi S. Ananth
Published: March 2019

Hypertensive disorders of pregnancy—chronic hypertension, gestational hypertension, and preeclampsia—are uniquely challenging as the pathology and its therapeutic management simultaneously affect mother and fetus, sometimes putting their well-being at odds with each other. Preeclampsia, in particular, is one of the most feared complications of pregnancy. Often presenting as new-onset hypertension and proteinuria during the third trimester, preeclampsia can progress rapidly to serious complications, including death of both mother and fetus. While the cause of preeclampsia is still debated, clinical and pathological studies suggest that the placenta is central to the pathogenesis of this syndrome. In this review, we will discuss the current evidence for the role of abnormal placentation and the role of placental factors such as the antiangiogenic factor, sFLT1 (soluble fms-like tyrosine kinase 1) in the pathogenesis of the maternal syndrome of preeclampsia. We will discuss angiogenic biomarker assays for disease-risk stratification and for the development of therapeutic strategies targeting the angiogenic pathway. Finally, we will review the substantial long-term cardiovascular and metabolic risks to mothers and children associated with gestational hypertensive disorders, in particular, preterm preeclampsia, and the need for an increased focus on interventional studies during the asymptomatic phase to delay the onset of cardiovascular disease in women.
Metabolic Surgery for Hypertension in Patients With Obesity
Authors: Pareek Manan , Bhatt Deepak L. , Schiavon Carlos Aurelio , Schauer Philip R.
Published: March 2019

The global prevalence of overweight and obesity has risen substantially over the past 4 decades and is accompanied by an increasing burden of cardiovascular risk factors such as hypertension. Metabolic surgery is the most effective method to treat obesity and may further improve associated conditions. Although most research has been directed toward the glycemic effects of weight loss surgery, there has been a growing interest in exploring its potential blood pressure–reducing properties. Systematic reviews and meta-analyses based primarily on observational data have suggested that metabolic surgery may aid in controlling hypertension. Only one randomized controlled trial specifically addressing this concept has been conducted, though supportive of the findings from observational studies. We review contemporary procedures for weight loss and their effects on cardiometabolic risk, particularly hypertension. In addition, we describe potential pathophysiological mechanisms and the effects of metabolic surgery on cardiovascular events and mortality.
A second species of Araucariocladus Silveira & Mermudes, with notes on the variation in antennomere numbers in this genus (Coleoptera: Lampyridae)
Authors: NUNES V.C.S. , SOUTO P.M. , MONTEIRO R.F. , SILVEIRA L.F.L.
Published: March 2019

Here, we describe Araucariocladus amfractus sp. nov., and compare it to the previously monotypic type-species, A. hiems. The new species can be distinguished from A. hiems by the following combination: colour pattern overall dark-brown; pedicel three times shorter than antennomere III and slightly wider than long; distance between antennal sockets as wide as 3/5 clypeal width; labial palpomere III with sides divergent towards apex, apical margin longer than dorsal and shorter than ventral margin; pronotum 1.5x wider than long, anterior margin somewhat sinuose, with a shallow angle anteriad, posterior margin almost straight. A. amfractus sp. nov. is, prima facie, endemic to the Itatiaia Massif, part of the Mantiqueira Mountain Range, Southeastern Brazil. We provide illustrations of the diagnostic features, and an occurrence map for the Araucariocladus species. Finally, we report a previously unrecognized intra-specific variation in the antennomere numbers of A. hiems, a feature also present in Araucariocladus amfractus sp. nov., and adjust the generic diagnosis to include species with 17 or 18 antennomeres. [Zoobank LSID: urn:lsid:zoobank.org:act:C335B064-FBD4-4256-983D-B17DF06BAA0D]
Implications of a Climate-Changed Atmosphere on Cool-Climate Viticulture
Authors: Schultze Steven R. , Sabbatini Paolo
Published: March 2019

The impact of anthropogenic global warming on viticulture has been thoroughly studied. However, many of the climate projections are limited by the resolution of the models that cannot resolve mesoscale weather patterns, which heavily influence grape production. In this work, data were gathered from the National Center for Atmospheric Research wherein a high-spatiotemporal-resolution (4 km× 4 km, 1 h) Weather Research and Forecasting (WRF) Model was run from October 2000 to September 2013 over North America using observed data, and again using the atmospheric chemistry of CMIP5 ensemble mean of the RCP8.5 greenhouse gas emission scenario, creating a pseudo–global warming (PGW) model. Such models are capable of resolving the mesoscale influences that most climate models cannot. Contrasting the observed results to the PGW results allows users to compare “what happened” to “what could have happened.” This analysis was applied to four cool-climate viticultural regions in the United States: two in Michigan, one in upstate New York, and one in Oregon. In the PGW run, hours exposed to extreme heat (>32°C) increase by orders of magnitude. Growing season degree-day (GDD) accumulations increase between 783 and 1057 base 10°C in comparing the models, while growing season average temperatures increase between 4.05° and 5.53°C. Precipitation patterns were also studied. The four regions would no longer classify as “cool climate” and would see growing seasons similar to some of the most productive warm-climate wine-producing regions. The authors consider the opportunities and challenges presented by the potential climate shift for cool-climate and warm-climate viticultural regions.
A Global Climatology of Extratropical Transition. Part I: Characteristics across Basins
Authors: Bieli Melanie , Camargo Suzana J. , Sobel Adam H. , Evans Jenni L. , Hall Timothy
Published: March 2019

The authors present a global climatology of tropical cyclones (TCs) that undergo extratropical transition (ET). ET is objectively defined based on a TC’s trajectory through the cyclone phase space (CPS), which is calculated using storm tracks from 1979–2017 best track data and geopotential height fields from reanalysis datasets. Two reanalyses are used and compared for this purpose, the Japanese 55-yr Reanalysis and the ECMWF interim reanalysis. The results are used to study the seasonal and geographical distributions of storms undergoing ET and interbasin differences in the statistics of ET occurrence. About 50% of all TCs in the North Atlantic and the western North Pacific undergo ET. In the Southern Hemisphere, ET fractions range from about 20% in the south Indian Ocean and the Australian region to 45% in the South Pacific. In the majority of ETs, TCs become thermally asymmetric before forming a cold core. However, a substantial fraction of TCs take the reverse pathway, developing a cold core before becoming thermally asymmetric. This pathway is most common in the eastern North Pacific and the North Atlantic. Different ET pathways can be linked to different geographical trajectories and environmental settings. In ETs over warmer sea surface temperatures, TCs tend to lose their thermal symmetry while still maintaining a warm core. Landfalls by TCs undergoing ET occur 3–4 times per year in the North Atlantic and 7–10 times per year in the western North Pacific, while coastal regions in the Australian region are affected once every 1–2 years.
Influences of Tropical Indian and Pacific Oceans on the Interannual Variations of Precipitation in the Early and Late Rainy Seasons in South China
Authors: Yuan Chaoxia , Liu Junqi , Luo Jing-Jia , Guan Zhaoyong
Published: March 2019

Because of the seasonal northward migration of the East Asian summer monsoon, the mean-state atmospheric circulation in South China (SC) is remarkably different between the early (May–June) and late (July–August) rainy seasons. This study presents distinct teleconnections between the SC precipitation in the two periods and the sea surface temperatures (SSTs) in the tropical oceans. In the early rainy season when the major monsoon rain belt is located in SC, the increased local precipitation is related to the tropical Indian Ocean Basin warming. The basin warming induces an anomalous anticyclone in the South China Sea–western North Pacific (SCS-WNP). The related southwesterly anomalies transport more moisture to SC and lead to more moisture convergence and precipitation there. In the late rainy season when the major monsoon rain belt migrates northward to the Yangtze River valley, the precipitation increase in SC can be caused by the dipole SST anomalies in the tropical Pacific with the cold anomalies near the Maritime Continent and warm ones near the date line. The dipole SST anomalies generate an anomalous cyclone in the WNP with its center more northward than that of the anomalous anticyclone in the early rainy season. The related northeasterly anomalies along its northwestern flank reduce the climatological northward transport of moisture flux out of SC, and increase the moisture convergence and precipitation there. The distinct teleconnections between the SC precipitation and the tropical SSTs in the early and late rainy seasons can be well reproduced in the sensitivity experiments by an atmospheric general circulation model.
Multirotor UAV-Based Platform for the Measurement of Atmospheric Turbulence: Validation and Signature Detection of Tip Vortices of Wind Turbine Blades
Authors: Fuertes Fernando Carbajo , Wilhelm Lionel , Porté-Agel Fernando
Published: March 2019

The present study describes the development of a technique for the measurement of atmospheric turbulence and temperature at a point in space based on the integration of a fast-response multihole pressure probe and a thermocouple with an inertial measurement unit on a multirotor UAV-based platform. This allows for an accurate measurement of time series of the three components of the velocity vector and temperature at any point in space in which the UAV can fly within the limitations of its autonomy. The presented technique relies on an accurate correction of the three-component velocity vector measured by the pressure probe on the frame of reference of the UAV—noninertial—with the information provided by the inertial measurement unit. The study includes a validation of the technique against sonic anemometry and the measurement of the signature of tip vortices shed by the blades of a full-scale wind turbine as an example of its potential.
How do external regulations shape the design of ethical tools in organisations? An open polity and sociology of compliance perspective
Authors: Ben Khaled Wafa , Gond Jean-Pascal
Published: March 2019

In response to the numerous hard and soft ethical regulations that have emerged in the wake of recurrent corporate scandals, Multinational Corporations (MNCs) have adopted ethical tools. This move is often interpreted as a means to garner legitimacy and as loosely coupled to corporate activities. Little is known, however, about the processes by which external regulations affect the design of ethical tools. Approaching organisations as open polities and building on institutional theory and the sociology of compliance, we conducted a qualitative study of the development of 23 ethical tools at four MNCs. We analytically induced a three-stage model that explains how ethical tools are externally sourced (importation), then subjected to competing pressures from distinct professional groups that replicate legal features of the environment (politicisation), to become finally turned into quasi-legal procedures (legalisation). Our analysis contributes to theory by explaining how external regulations relate to the organisational production of ethical tools in a self-reinforcing manner, while specifying the role of ethics professionals in the process of ethical tool production.
Process modelling of discontinuous long fibre carbon/polyether ether ketone composites: Defect prediction
Authors: Landry Benoit , Hubert Pascal
Published: March 2019

A numerical model was developed to predict the defect formation during processing of compression moulded discontinuous long fibre carbon/polyether ether ketone composites. The model inputs are the material's temperature-dependant properties (through-thickness modulus and thermal shrinkage), the temperature distribution of the part during cooling and the applied moulding pressure. The material properties of carbon/polyether ether ketone prepreg were measured during cooling from melt using thermal analyses. The model was employed to identify regions on manufactured panels where pressure could be lost during cooling, which are prone to defect formation. Validation was performed by comparing the predicted defect areas against those found on flat panels moulded at pressures ranging from 10 to 110 bar. The model was then employed in a case study to show the importance of the cooling strategy in order to prevent defects on complex-shape components.
Analysis of corrosion behaviour and surface properties of plasma-sprayed composite coating of hydroxyapatite–tantalum on biodegradable Mg alloy ZK60
Authors: Singh Balraj , Singh Gurpreet , Sidhu Buta Singh
Published: March 2019

Magnesium (Mg) and its alloys are promising candidates for biodegradable bio-implants. However, the excessive corrosion in the physiological environment and subsequent decline in the mechanical integrity of Mg and its alloys have limited their utility as biomaterials. In the present study, an attempt has been made to improve the corrosion resistance of Mg alloy ZK60 plasma sprayed with tantalum (Ta)-reinforced hydroxyapatite coating. The experiment was conducted with three varied levels, i.e. 10, 20 and 30 weight percent (wt%) of Ta-content in hydroxyapatite coating. The coatings were characterized and in vitro corrosion behaviour was investigated by electrochemical measurements in Ringer's solution along with the analysis of surface properties. The corrosion resistance of the Mg alloy increased with the incremental increase in Ta reinforcement in hydroxyapatite coating. An increase in the protection efficiency was analysed for the Ta-reinforced hydroxyapatite coatings (∼10%, 18% and 23% for hydroxyapatite-10Ta, hydroxyapatite-20Ta and hydroxyapatite-30Ta, respectively) as compared to the pure hydroxyapatite coating. The hydroxyapatite coating effectively increased the surface hardness of the Mg alloy and Ta reinforcement further enhanced it. Surface roughness decreased with the incremental increase in Ta-content in hydroxyapatite coating. Wettability analysis revealed the hydrophilic nature of pure hydroxyapatite and Ta-reinforced hydroxyapatite coatings. The results of the study suggest that the proposed Ta reinforcement in hydroxyapatite is potentially important for biodegradable Mg bio-implants.
Effect of graphene oxide as a filler material on the mechanical properties of LLDPE nanocomposites
Authors: Li Juntao , Gunister Ebru , Barsoum Imad
Published: March 2019

Graphene oxide (GO) has high aspect ratios than many nanosize fillers such as carbon nanotubes and clay, besides its better mechanical properties than many polymers; so they are preferred as a filler material in polymer matrix composites. In this study, the effect of GO on the mechanical properties of linear low-density polyethylene (LLDPE) were experimentally investigated. LLDPE-GO nanocomposites were prepared by melt compounding method, and the extruded nanocomposite was shaped by injection molding machine for the mechanical tests. The mechanical properties investigated included tensile properties, fatigue properties, as well as hardness properties. Differential scanning calorimeter (DSC) was employed to study the thermal characterization of the composites. The results revealed that the addition of GO nanosheets indeed had a positive effect on the tensile, fatigue, and hardness properties. The tensile strength, Young's modulus, and Shore D hardness value were increased by 27.4%, 31.3%, and 9%, respectively, with a GO loading ranging from 0 wt.% to 2 wt.%. The addition of GO had a significant effect on the fatigue properties of the composites such as nearly exponential increment in the cyclic numbers. The samples with 2 wt.% of GO could endure up to 106 cycles during the tests, which is 100 times that of pure LLDPE. The morphological analysis via X-ray diffraction (XRD) and transmission electron microscopy (TEM) indicated that GO nanosheets were well exfoliated in the LLDPE matrix. However, there is no significant effect on the melting temperature, crystallization temperature and crystallinity of LLDPE based on DSC result.
Prosocial Goal Pursuit in Crowdfunding: Evidence from Kickstarter
Authors: Dai Hengchen , Zhang Dennis J.
Published: March 2019

In reward-based crowdfunding, creators of entrepreneurial projects solicit capital from potential consumers to reach a funding goal and offer future products/services in return. The authors examine consumers’ contribution patterns using a novel data set of 28,591 projects collected at 30-minute resolution from Kickstarter. Extending prior research that assumes that economic considerations (e.g., project quality, campaign success likelihood) drive backers’ decisions, the authors provide the cleanest field evidence so far that consumers also have prosocial motives to help creators reach their funding goals. They find that projects collect funding faster right before (vs. right after) meeting their funding goals because consumers not only are more likely to fund projects but also contribute greater amounts of money prior to goal attainment. This effect is amplified when the nature of a project tends to evoke consumers’ prosocial motivation and when a project’s creator is a single person. These results suggest that consumers’ prosocial motives not only play a role in reward-based crowdfunding but also can outweigh the opposing effects of economic factors including rational herding and certainty about campaign success.
Feasibility of Ecological Momentary Assessment of Negative Emotion in Girls With ADHD: A Pilot Study
Authors: Babinski Dara E. , Welkie Janelle
Published: March 2019

This study explores the feasibility of using mobile phone ecological momentary assessment to evaluate negative emotion in adolescent girls with attention-deficit/hyperactivity disorder (ADHD). A total of 13 girls with ADHD, ages 12–16 years old (38.5% with comorbid depression), and their mothers completed several daily surveys assessing the intensity and variability of youth negative emotion using mobile phone-based ecological momentary assessment for approximately one week. The rate of response to survey prompts by youth and maternal reports was examined. In addition, associations between girls’ and mothers’ ratings of negative emotion were calculated. Finally, the severity and fluctuation in negative emotion were compared between girls with and without depression. Girls and their mothers demonstrated a high level of compliance with assessment procedures, and maternal and youth ratings were significantly correlated. In addition, girls with comorbid depression and their mothers endorsed significantly more intense and variable negative emotion compared to girls with ADHD alone. These preliminary findings show that ecological momentary assessment is a feasible and valid method for collecting information on emotion regulation among girls with ADHD and their mothers that can be applied to future work aimed at collecting ecologically valid assessments of functioning in girls with ADHD.
Applications of solar and wind renewable energy in agriculture: A review
Authors: Acosta-Silva Yuliana de Jesus , Torres-Pacheco Irineo , Matsumoto Yasuhiro , Toledano-Ayala Manuel , Soto-Zarazúa Genaro Martín , Zelaya-Ángel Orlando , Méndez-López Arturo
Published: March 2019

The growing demand for food and the unstable price of fossil fuels has led to the search for environmentally friendly sources of energy. Energy is one of the largest overhead costs in the production of greenhouse crops for favorable climate control. The use of wind–solar renewable energy system for the control of greenhouse environments reduces fuel consumption and so enhances the sustainability of greenhouse production. This review describes the impact of solar–wind renewable energy systems in agricultural greenhouses.
Behaviour planning and inhibitory control in Sepedi-speaking primary school children with attention-deficit/hyperactivity disorder
Authors: Mokobane Maria , Pillay Basil Joseph , Meyer Anneke
Published: March 2019

Attention-deficit hyperactivity disorder is one of the most common disorders that can occur in children. The symptoms are thought to result from a deficit in executive functions. This study investigated whether children with attention-deficit hyperactivity disorder subtypes differed in behavioural planning and response inhibition, two of the domains of executive functioning, from a control group without attention-deficit hyperactivity disorder symptoms. Furthermore, it examined whether the three attention-deficit hyperactivity disorder subtypes differed from each other in terms of performance. The sample ( n = 320) consisted of primary school children, aged between 6 and 14 years, from the Moletjie circuit (Limpopo). It consisted of an attention-deficit hyperactivity disorder group ( n = 160) and a control group ( n = 160). The Disruptive Behavioural Disorder rating scale was used to establish the symptoms of attention-deficit hyperactivity disorder. The Tower of London was used to measure planning ability, and the inhibition subtest (arrows and shapes) from the NEPSY-II (Developmental Neuropsychological Assessment, second edition) to measure response inhibition. Analysis of variance was employed to establish differences in subtype, gender, and age group. The results showed that children with the combined attention-deficit hyperactivity disorder subtype demonstrated significantly more deficits than the control group, in both behavioural planning and inhibition control. No significant differences between the hyperactive/impulsive and inattentive attention-deficit hyperactivity disorder subtypes and the control group were found. Gender and age did not influence performance with regard to planning and inhibition tasks. Correlations between planning behaviour and response inhibition were low, which suggests that they are distinct processes.
A switching sliding mode control technique for chaos suppression of fractional-order complex systems
Authors: Roohi Majid , Khooban Mohammad-Hassan , Esfahani Zahra , Aghababa Mohammad Pourmahmood , Dragicevic Tomislav
Published: March 2019

Switching sliding mode control (SSMC) can be utilized as a robust control technique, which is appropriate for the control of highly non-linear power systems like chaotic systems. The present study proposes a switching sliding mode control technique for control and chaos suppression of non-autonomous fractional-order (FO) nonlinear power systems with uncertainties and external disturbances. In the first step, a novel fractional switching sliding surface is introduced as well as its stability analysis to the origin is demonstrated. In the second step, based on the fractional version of the Lyapunov stability theory, a robust non-singular control law is designed to ensure the convergence of the system trajectories to the proposed sliding surface. Next, the proposed SSMC approach is utilized for designing a single input switching control technique for the stabilization of a class of 3D FO chaotic power systems. In order to evaluate the effectiveness and robustness of the suggested approach in practice, two examples including control and the stabilization of FO chaotic electric motors are illustrated.
Global or Regional Value Chains? Evidence from China
Authors: Fan Zijie , Zhang Yabin , Liao Chun
Published: March 2019

We document the regional characteristics in China’s global value chains. In contrast to the previous related literature, we focus on the right definition of domestic value added (DVA) in bilateral–sector exports and study the heterogeneity of the share of DVA finally absorbed abroad in exports (DVA ratio) across bilateral trade partners. We find that China’s DVA ratio within the “Asian factory” region is smaller and declines more over time than outside, showing typical regional characteristics of China’s value chains. Instead of final exports, intermediate exports play a dominant role in explaining the regional characteristics. This is a new finding. Using a structural gravity model, we find that DVA ratio in intermediates has fallen more across proximate trade partners for China.
Spirituality and Entrepreneurship: The Role of Magical Thinking in Future-Oriented Sensemaking
Authors: Ganzin Max , Islam Gazi , Suddaby Roy
Published: March 2019

Drawing from a qualitative empirical study of Canadian entrepreneurs, we seek to understand the nature of entrepreneurial thinking. More specifically, we analyse entrepreneurs’ cognitive capacity to mitigate the risk inherent in an uncertain future and overcome low community expectations of entrepreneurial success. We introduce the notion of ‘magical thinking’, an emergent construct that refers to a cluster of beliefs that maintain the motivation and focus of entrepreneurs by transmuting agency from a rational-scientific context in which the entrepreneur imposes his or her will on the environment, to a spiritual context in which the entrepreneur perseveres by remaining true to trust in a wider cosmological belief system. We identify three key elements of magical thinking – finding one’s path, obtaining the answers and being at peace.
‘Eating Bitterness’ in a Chinese Multinational: Identity Regulation in Context
Authors: Lai Keyan , Morgan Glenn , Morris Jonathan
Published: March 2019

This paper responds to the call for more focus on how micro-level processes of identity regulation are shaped by, and constitutive of, wider societal institutions. We provide a case study of identity regulation in a Chinese multinational and show how senior managers in the firm draw on distinctive national and organizational contexts in China to construct, reinforce and reproduce a particular set of identities for employees. These identities draw upon discourses in the wider Chinese context which reflect the struggle of China to become a major industrial power after a century of humiliation by the West and the need for employees to provide this extra effort in the face of the existential challenges faced by the company and by the country. We demonstrate how managers create specific HR mechanisms that intertwine these discourses with the identities of employees and with the identity of the organization. This paper contributes to a better understanding of how micro-processes of identity work and mid-level processes of identity regulation and firm strategy are linked to macro-level institutional structures. Based on the framework provided, the paper discusses how far similar identity regulation mechanisms could be adopted elsewhere where similar macro-level discourses might be available, first in other Chinese MNCs, second, in other East Asian countries such as South Korea, third, more widely in emergent economies where MNCs are embedded in state-driven forms of capitalism, and finally in developed economies where populist nationalism is becoming increasingly influential. In this way, studies of identity regulation can bring organization studies into greater dialogue with other social sciences concerned with wider institutional change and continuity
A conceptual critique of Prevent: Can Prevent be saved? No, but…
Authors: Skoczylis Joshua , Andrews Sam
Published: March 2019

The UK’s Prevent policy continues to fail in its fundamental purpose to prevent extremism and has at times even created spaces where extremism flourishes. This article goes beyond the mechanism of implementation providing a conceptual understanding of how Prevent maintains the neoliberal status quo. The promotion of the neoliberal status quo, depoliticisation and a lack of focus on root causes continue to undermine Prevent. Any policy aimed at preventing extremism and terrorism must be well integrated into the government’s wider social policies, shifting away from securitisation and towards improving society. Reducing extremism becomes a by-product of a much broader attempt at changing society, focusing on policies that address racism, gender and socio-economic inequality. These policies, we argue, must encourage political engagement with all groups, especially marginalised ones. Creating a healthier democracy will reduce risks of extremism and will negate the need for a Prevent policy based on discrimination and securitisation.