bluuebunny/crossref_metadata_2025 huggingface dataset:
El cuestionario como herramienta de análisis en la gestión y comunicación de la responsabilidad social de los atletas de élite españoles
Authors: Abuín-Penas Javier
Published: July 2019

El objeto del presente estudio es mostrar el cuestionario como la herramienta más adecuada para el análisis de la gestión y comunicación de la Responsabilidad Social Corporativa de los atletas de élite españoles. Además, se presenta una propuesta de cuestionario para dicho objetivo tras el análisis de estudios previos que utilizaron esta herramienta en la investigación de la RSC en el mundo del deporte. La validación del cuestionario se consiguió tras la valoración por parte del juicio de expertos académicos y profesionales del sector. Los resultados obtenidos muestran que el cuestionario es útil y válido para conocer las estrategias y la comunicación de la Responsabilidad Social Corporativa de los atletas de élite españoles.
La visibilidad en Internet de las instituciones universitarias
Authors: López-Cepeda Ismael , Mañas-Viniegra Luis
Published: July 2019

La presente investigación realiza un análisis metodológico y de contenido acerca de las causas que rigen la visibilidad en la Red a través del posicionamiento orgánico que realizan los motores de búsqueda (SEO) de las universidades. Para ello, se utilizan distintas herramientas de cómputo bajo demanda o cloud computing que permiten conocer, por un lado, el grado de optimización técnica de los diferentes sitios web y, por otro lado, el alcance y repercusión de sus comunidades online en redes sociales. Las conclusiones reflejan las múltiples causas por las que un sitio web tiene mayor visibilidad en la Red, tomando como referencia los entornos digitales de la Universidad Complutense de Madrid y la Universidad Rey Juan Carlos en el ámbito de la Comunidad de Madrid.
PENGARUH PENDAMPINGAN KELUARGA DIABETIK TERHADAP PENURUNAN KADAR GULA DARAH DI PUSKESMAS WONOREJO
Authors: Widayati Eny , Supriadi Supriadi , Firdaus Rivan
Published: July 2019

PENGARUH PENDAMPINGAN KELUARGA DIABETIK TERHADAP PENURUNAN KADAR GULA DARAH

DI PUSKESMAS WONOREJO
HUBUNGAN INDEKS MASSA TUBUH (IMT) DENGAN RESIKO KAKI DIABETIK PADA PASIEN DIABETES MELITUS TIPE 2
Authors: Tini Tini
Published: July 2019

Meningkatnya kejadian diabetes melitus mengakibatkan pula meningkatnya komplikasi, salah satunya kaki diabetik. Kaki diabetik dapat disebabkan oleh berbagai faktor resiko diantaranya adalah faktor kegemukan yang ditandai dengan tingginya indeks massa tubuh (IMT). Penelitian ini bertujuan untuk mengetahui hubungan antara hubungan indeks massa tubuh (IMT) dengan resiko kaki diabetik pada pasien diabetes melitus tipe 2.

Penelitian ini menggunakan rancangan analitik korelasional dengan pendekatan cross sectional. Responden berjumlah 68 orang yang diambil secara purposive sampling. Indeks massa tubuh diperoeh dari pengukuran berat badan dan tinggi badan yang dihitung melalui rumus BB/TB2.  Sedangkan resiko kaki diabetik diambil melalui pemeriksaan skrining resiko kaki diabetik dengan Screening Tools Inlow’s 60 second diabetic foot dari Canadian Association of Wound Care.

Hasil penelitian menunjukkan bahwa sebagian besar responden memiliki IMT ≥ 23 (73,5%) dan beresiko rendah terjadinya kaki diabetik (67,6%). Analisis statistik dengan uji Chi square diperoleh tidak ada hubungan antara indeks massa tubuh (IMT) dengan resiko kaki diabetik (p value 0,245). Meskipun beresiko rendah  untuk mengalami kaki diabetik, namun terdapat beberapa faktor resiko yang dimiliki oleh pasien diantaranya penggunaan alas kaki yang salah, adanya kesemutan dan neuropati. Sehingga perlu dilakukan pengendalian kadar gula darah melalui pengontrolan berat badan dan perawatan kaki
Analisis Pengelolaan Limbah Medis Puskesmas di Kecamatan Babulu Kabupaten Penajam Paser Utara Berdasarkan Permenkes Nomor 27 Tahun 2017
Authors: Amrullah Amrullah Aam
Published: July 2019

The amount of medical waste originating from health facilities are expected progressively increasing. Waste generated from medical efforts such as health centers, polyclinics and hospitals are the type of waste which are included in the category of biohazard waste is very dangerous type of environment, where many exiles viruses, bacteria and other harmful substances. This study was conducted to analyze the management of solid medical waste in the public health centers in Kecamatan Penajam Kabupaten Penajam Paser Utara Provinsi Kalimantan Timur.

This research is a qualitative descriptive. The object of research is the implementation of medical waste management in health centers and community health centers target sanitarians and janitor. The research variables include the characteristics of medical waste, stage management, medical waste management officers, facilities, SOP and the perceived health impact of medical waste management officers.

The results showed solid medical waste management of health centers is not in accordance with the applicable provisions of the color of plastic bags are used not appropriate, storage locations are not eligible, and there are medical waste that is not destroyed by incineration. Medical waste management facilities not adequate ie no conveyance and no incinerators. Medical waste management is done not in accordance with the SOP and SOP is not in accordance with regulations. Medical waste management officers not using PPE.

It is advisable to do a lug medical waste with a plastic bag, label and symbol in accordance with existing regulations. Medical waste storage location is advisable to be in a secure area and symbols and labels. Waste disposal is done in the health center in order to keep attention to the existing guidelines to minimize the risk. The need for training on medical waste management and use of PPE.
In vivo zinc oxide nanoparticles induces acute hyperglycemic response a dose-dependent and route of administration in healthy and diabetic rats
Authors: Ibarra-Leal Jesús José , Yocupicio Luis , Apolinar-Iribe Alejandro , Díaz-Reval Irene , Parra-Delgado Hortensia , Limón-Miranda Saraí , Sánchez-Pastor Enrique A , Virgen-Ortiz Adolfo
Published: July 2019

In recent years, different studies carried out in experimental diabetes models suggest that zinc oxide nanoparticles (ZnONPs) can be good antidiabetic agents, this evidence was obtained from long-term treatments using repeated doses of zinc oxide nanoparticles. The goal of this work was to evaluate the acute effects during six hours post-administration of ZnONPs on glycemia in healthy and diabetic rats and to compare the effects of oral and intraperitoneal administration. For this study male Wistar rats were used and experimental diabetes was induced by streptozotocin-nicotinamide intraperitoneal administration. At short-term ZnONPs administration induced hyperglycemic response in healthy and diabetic rats, the effect was dose-dependent and administration route. The diabetic rats were more sensitive to ZnONPs effect. In conclusion, this study provides novel information about the acute effects of zinc oxide nanoparticles on the fasting glycemia in experimental diabetes in vivo model and healthy rats, these data are important for its future clinical applications.
The Spur and the Gap in GD-1: Dynamical Evidence for a Dark Substructure in the Milky Way Halo
Authors: Bonaca Ana , Hogg David W. , Price-Whelan Adrian M. , Conroy Charlie
Published: July 2019

We present a model for the interaction of the GD-1 stellar stream with a massive perturber that naturally explains many of the observed stream features, including a gap and an off-stream spur of stars. The model involves an impulse by a fast encounter, after which the stream grows a loop of stars at different orbital energies. At specific viewing angles, this loop appears offset from the stream track. A quantitative comparison of the spur-and-gap features prefers models where the perturber is in the mass range of 106
–108
M
⊙. Orbit integrations back in time show that the stream encounter could not have been caused by any known globular cluster or dwarf galaxy with a determined orbit, and mass, size, and impact parameter arguments show that it could not have been caused by a molecular cloud in the Milky Way disk. The most plausible explanation for the gap-and-spur structure is an encounter with a dark matter substructure, like those predicted to populate galactic halos in ΛCDM cosmology. However, the expected densities of ΛCDM subhalos in this mass range and in this part of the Milky Way are 2σ–3σ lower than the inferred density of the GD-1 perturber. This observation opens up the possibility that detailed observations of streams could measure the mass spectrum of dark matter substructures and even identify individual substructures and their orbits in the Galactic halo.
TESS Hunt for Young and Maturing Exoplanets (THYME): A Planet in the 45 Myr Tucana–Horologium Association
Authors: Newton Elisabeth R. , Mann Andrew W. , Tofflemire Benjamin M. , Pearce Logan , Rizzuto Aaron C. , Vanderburg Andrew , Martinez Raquel A. , Wang Jason J. , Ruffio Jean-Baptiste , Kraus Adam L. , Johnson Marshall C. , Thao Pa Chia , Wood Mackenna L. , Rampalli Rayna , Nielsen Eric L. , Collins Karen A. , Dragomir Diana , Hellier Coel , Anderson D. R. , Barclay Thomas , Brown Carolyn , Feiden Gregory , Hart Rhodes , Isopi Giovanni , Kielkopf John F. , Mallia Franco , Nelson Peter , Rodriguez Joseph E. , Stockdale Chris , Waite Ian A. , Wright Duncan J. , Lissauer Jack J. , Ricker George R. , Vanderspek Roland , Latham David W. , Seager S. , Winn Joshua N. , Jenkins Jon M. , Bouma Luke G. , Burke Christopher J. , Davies Misty , Fausnaugh Michael , Li Jie , Morris Robert L. , Mukai Koji , Villaseñor Joel , Villeneuva Steven , De Rosa Robert J. , Macintosh Bruce , Mengel Matthew W. , Okumura Jack , Wittenmyer Robert A.
Published: July 2019

Young exoplanets are snapshots of the planetary evolution process. Planets that orbit stars in young associations are particularly important because the age of the planetary system is well constrained. We present the discovery of a transiting planet larger than Neptune but smaller than Saturn in the 45 Myr Tucana–Horologium young moving group. The host star is a visual binary, and our follow-up observations demonstrate that the planet orbits the G6V primary component, DS Tuc A (HD 222259A, TIC 410214986). We first identified transits using photometry from the Transiting Exoplanet Survey Satellite (TESS; alerted as TOI 200.01). We validated the planet and improved the stellar parameters using a suite of new and archival data, including spectra from Southern Astrophysical Research/Goodman, South African Extremely Large Telescope/High Resolution Spectrograph and Las Cumbres Observatories/Network of Robotic Echelle Spectrographs; transit photometry from Spitzer; and deep adaptive optics imaging from Gemini/Gemini Planet Imager. No additional stellar or planetary signals are seen in the data. We measured the planetary parameters by simultaneously modeling the photometry with a transit model and a Gaussian process to account for stellar variability. We determined that the planetary radius is 5.70 ± 0.17 R
⊕ and that the orbital period is 8.1 days. The inclination angles of the host star’s spin axis, the planet’s orbital axis, and the visual binary’s orbital axis are aligned within 15° to within the uncertainties of the relevant data. DS Tuc Ab is bright enough (V = 8.5) for detailed characterization using radial velocities and transmission spectroscopy.
Physical Exercise Increased Brain-Derived Neurotrophic Factor in Elderly Population with Depression
Authors: Kurdi Fauziah Nuraini , Flora Rostika
Published: July 2019

BACKGROUND: Depression is very common in the elderly population. Physical exercise is one of the non-pharmacological procedures that promise to be a solution to improve the severity of depression. Brain-Derived Neurotrophic Factor (BDNF) plays a role in maintaining the survival of neuronal cells and in the regulation of synapse plasticity, affecting serotonin production in the hippocampus and thus the depressive symptoms.
AIM: This study aimed to assess the role of physical exercise in affecting BDNF levels in elderly with depression.
METHODS: Thirty-five elderly women (age ≥ 50 years) with depressive episodes based on Diagnostic and Statistical Manual of Mental Disorders (DSM)-V criteria were enrolled as treatment group, and 35 elderly women without depressive episodes were enrolled as control group, and underwent physical exercise in the form of treadmill with a speed of 6 km/h for 15 minutes. Physical exercise was carried out once a day for 28 days. As much as 1 ml of blood from the study, subjects were obtained from the cubital vein before the exercise commenced. Brain-Derived Neurotrophic Factor (BDNF) serum level was assessed by Enzyme-Linked Immunosorbent Assay (ELISA). Data were presented in the form of mean ± SD. An independent T-test was used to test levels after exercise in the depression group compared to the non-depression group.
RESULTS: Pre-exercise BDNF levels in the depression group were lower than the group of elderly without depression. Physical exercise increased BDNF production in both elderly groups with and without depression. In the depression group, the increasing percentage of BDNF level was higher compared to non-depressive elderly.
CONCLUSION: The increasing percentage of BDNF level was found to be higher in depressive elderly performing physical exercise. Physical exercise may be beneficial in supporting the therapy of elderly with depression.
Les peintres et sculpteurs « sans qualité ». Une population invisible dans le Paris des Lumières ?
Authors: Tauziède-Espariat Maël
Published: July 2019

Les archives de la police de Paris au xviii e  siècle révèlent l’existence de travailleurs actifs en dehors des institutions, et donc peu visibles. Parmi eux, les peintres et sculpteurs « sans qualité » constituaient une population hétérogène, mobile et nombreuse. Une évaluation quantitative indique que les artisans, artistes et marchands « sans qualité » actifs dans les domaines des beaux-arts, des arts décoratifs, du marché de l’art et du bâtiment représenteraient des centaines d’individus dans les années 1760. Marginalisés juridiquement et intégrés économiquement, les peintres et sculpteurs « sans qualité » sont mêlés de facto aux dérèglements institutionnels de la seconde moitié du xviii e  siècle qui conduisirent à la remise en cause du système corporatif et à la libéralisation du statut de l’artiste. Dans le domaine plus spécifique de l’histoire sociale de l’art, les archives de la police renseignent sur l’atelier, les pratiques artistiques et la production, comblant ainsi des lacunes biographiques. Cette étude montre aussi comment de jeunes artistes constituaient un objet de rivalités entre l’Académie royale de peinture et de sculpture et la Communauté des peintres et sculpteurs de Paris, et questionne la possibilité de faire une carrière artistique en dehors des institutions.
Les exercices « au grand air » des lycéens (1820-1880) : un effet des campagnes hygiénistes du début du XIX e siècle ?
Authors: Hoibian Olivier , Vaucelle Serge
Published: July 2019

Pour expliquer l’instauration de l’enseignement obligatoire de la gymnastique à l’école en France, une certaine tradition historiographique privilégie l’influence des préoccupations patriotiques ou militaires des années 1870-1880 (décret Duruy, 1869 ; loi George, 1880). Ce n’est que dans un second temps que les revendications des médecins viendraient contester les orientations militaristes de la gymnastique scolaire à partir du débat de l’Académie de médecine de 1887 sur le « surmenage intellectuel ». Cette approche de l’histoire de l’instauration de l’éducation physique scolaire comme passage d’un âge militaire à un âge médical avant l’avènement d’un âge pédagogique, semble devoir être interrogée. Une telle interprétation tend en effet à minimiser la présence significative de pratiques d’activités physiques dans les lycées dès la Restauration. Les premières campagnes des hygiénistes en faveur de l’exercice physique chez les adolescents commencent dans les premières années du xix e  siècle. Dès cette époque, la relation entre exercice physique et amélioration de la scolarité des élèves apparaît déjà construite et largement admise dans les milieux éclairés. L’analyse consistera à rendre compte des conditions sociales de l’instauration précoce de ces pratiques dans le cadre scolaire, en l’absence de toute prescription institutionnelle, de la Restauration aux années 1880.
Mapping Activities in Recreational Trail With Spatial Video
Authors: Hong Xin , Lee Jay
Published: July 2019

Understanding the usage patterns of a trail in a university environment is crucial for assessing the functionality of the trail and evaluating its impact to health in college students. This article presents a novel approach to map the usage patterns of a university trail by employing spatial video in a geographic information system (GIS) environment. Physical activities in the southeast part of the main campus of Kent State University (Kent, Ohio), were filmed by a GPS-enabled camera unit. The observed physical activities at the time of filming were coded from the videos and visualized as maps. The study finds that activities tend to concentrate near the center of campus, the farther from the campus, the fewer number of activities. The usage patterns are different between men and women. The activity zones of men are more dispersed, while those of women are more concentrated near campus center.
The Effects of Biodegradation on the Cytocompatibility of Bioresorbable Fe-Based Scaffolds: A Review
Authors: Caligari Conti Malcolm , Pollacco Daphne Anne
Published: July 2019

This work aims to review current trends in research within the field of iron-based scaffolds for orthopaedic applications. Current research is trapped in a ‘see-saw’ type problem where an increase in corrosion rate of the base metal is required to accelerate the degradation process making the resorption time compatible with the healing time. This is done via several methods including porosity control, cathodic element addition and/or patterning and alloying. In turn, this increase in corrosion rate causes the local concentration of metallic ions to increase beyond the toxicity limit for osteoblast type cells, thus negatively effecting cytocompatibility. This is most pronounced when considering the orthopaedic environment, in which static conditions provide for increased local ion concentrations, resulting in local toxicity. However, research from the medical field of Thalassemia may help solve this dilemma by providing chelation medicine for patients undergoing implantation of resorbable orthopaedic scaffolds, throughout the resorption period. Excretion of iron would then be provided mainly through bowel movement and urination.
Family and the Sexual Identity Development of Youth: A Comparative Sociological Study of the Semi-urban and Rural Youth in Ratnapura District of Sri Lanka
Authors: Welgama J.
Published: July 2019

The study captures the impact of structured relationships within the family on sexual identity development of youth. Research problem stems from the quarry whether the semi-urban and rural families exposed to the social dynamics of globalization, differ in their role constructing the sexual identities of youth. Parent-youth communication, social class and style of parenting, family role in the resolution of sexual identity crisis, and inter sibling relations are considered pertaining to the sexual identity development. Both quantitative and qualitative methods were adopted. Multi staged simple random sampling technique is employed representing semi-urban and rural youth (n=225) in the postal survey. Informal interviews and ten in-depth case studies of youth with unresolved sexual identities were carried out. The study substantiates that although, semi-urban and rural families do not drastically contrast with each other, and they constitute two different contexts of sexual identity development. Although, social class is not correlated, gender role socialization, style of parenting cause the semi-urban and rural difference pertaining to family role in sexual identity development. Qualitative analysis revealed the precursors of negative sexual identity development within the family. Sri Lankan families leave little margin and are emotionally less supportive in case of negative sexual identities.
A Critical Analysis of Radical Feminism in Jaishankar Prasad's Play Dhruvsvamini
Authors: Chandrasekara P. V. S.
Published: July 2019

The aim of this paper is to examine how Radical Feminism was discussed in Hindi plays in early 1930s, when it was not even introduced as a concept to literature. Jaishankar Prasad is an Indian writer who wrote the play Dhruvsvamini to introduce Radical Feminism to the Indian orthodox society. He started a rational discussion on radical issues such as; domestic oppression, polygamy, sexuality, right for the divorce, remarriage through this play. This paper reiterates that, though the concept of Radical Feminism came into the western literature around 1960s, the nucleus of radical thoughts can be identified in Prasad's plays of early twentieth century. This paper emphasizes that he has been inuenced by Buddhism and the thoughts of Indian feminist activists of that time. Literature review has been con- ducted to analyze the play Dhruvsvamini. The outcome of this paper would be an exploration of the Radical Feminism discussed in Hindi drama.
Prognostic significance of mutated genes in megakaryocytic disorders
Authors: Amin Asnafi Ali , Mohammadi Mohammad bagher , Rezaeeyan Hadi , Davari Nader , Saki Najmaldin
Published: July 2019

Megakaryopoiesis is a process during which platelets that play a major role in hemostasis are produced due to differentiation and maturation of megakaryocytic precursors. Several genes, including oncogenes and tumor suppressor genes, play a role in the regulation of this process. This study was conducted to investigate the oncogenes and tumor suppressor genes as well as their mutations during the megakaryopoiesis process, which can lead to megakaryocytic disorders. Relevant literature was identified by a PubMed search (1998-2019) of English language papers using the terms ‘Megakaryopoiesis’, ‘Mutation’, ‘oncogenes’, and ‘Tumor Suppressor’. According to investigations, several mutations occur in the genes implicated in megakaryopoiesis, which abnormally induce or inhibit megakaryocyte production, differentiation, and maturation, leading to platelet disorders. GATA-1 is one of the important genes in megakaryopoiesis and its mutations can be considered among the factors involved in the incidence of these disorders. Considering the essential role of these genes (such as GATA- 1) in megakaryopoiesis and the involvement of their mutations in platelet disorders, study and examination of these changes can be a positive step in the diagnosis and prognosis of these diseases.
WCPT-Africa
Authors: Beenhakker Jo
Published: July 2019

No abstract available
Physiotherapy education in Africa- The experience in Nigeria
Authors: Amosun Seyi L.
Published: July 2019

The African Rehabilitation Institute, an arm of the Organisation of African Unity, recently designed a physiotherapy education programme for implementation in African countries.  The West African sub-region, having one of the oldest physiotherapy education programmes in the continent, was not directly involved in the formulation of the programme.  A review of physiotherapy education in Nigeria, the first  African nation after South-Africa to be admitted into the membership of the World Confederation for Physical Therapy, shows that the programme recommended by the African Rehabilitation Institute is highly commendable.
Demographic and Clinical Characteristics of Chronic Myeloid Leukemia Patients: A Study on Confined Populations of Southern India
Authors: Gorre Manjula , Sashidhar RB , Annamaneni Sandhya , Digumarti Raghunadharao , Satti Vishnupriya
Published: July 2019

Context: Chronic myeloid leukemia (CML) is one of the most common hematological malignancies in all populations throughout the world. Even though the pathophysiology of CML was well explained in majority of the studies, the incidence of CML was shown to exhibit population diversity, and hence, the demographic factors underlying CML origin remain to be understood. Further, the introduction of tyrosine kinase inhibitors had revolutionized the treatment of CML over the years; however, there is a need for developing tailoring therapy to individual risk since the patient clinical heterogeneity poses a major problem during drug response. Therefore, the study of basic clinical picture may aid in planning treatment strategies for CML patients. Aim: The aim of this article is to study the epidemiological and clinical variables associated with the prognosis of CML. Subjects and Methods: We have considered the distribution of various demographic and clinical variables among 476 CML patients diagnosed at Nizam’s Institute of Medical Sciences, Hyderabad, Telangana, India. Statistical Analysis Used: All the analyses were performed through SPSS software (version 21.0). Correlation and Cox regression analyses were also performed. Results: Apart from the elevated male sex ratio in CML incidence, high frequency of males was observed to be nonresponders to imatinib mesylate (IM). IM response was shown to be dependent on phase of diagnosis, whereas overall survival of CML patients depends on the age at onset and response to IM. Conclusions: The study of epidemiology and clinical picture of CML patients may help in planning better treatment strategies at diagnosis to achieve long-term progression-free survival.
Pattern of Bone Marrow Involvement by Solid Tumors: Experience from a Tertiary Care Center from South India
Authors: Rudresha AH , Patidar Rajesh , Lakshmaiah Kuntegowdanahalli C , Babu K Govind , Lokanatha Dasappa , Jacob Linu Abraham , Babu MC Suresh , Namrata NR , Kadabur N Lokesh , Rajeev LK , Anand Abhishek , Asati Vikas
Published: July 2019

Background: Bone marrow involvement by solid tumor implicates advanced disease and dismal prognosis. Bone marrow aspiration and biopsy are routinely performed as staging workup for certain small round cell tumors and also for unexplained cytopenia in other solid tumors. It is important to rule out bone marrow involvement before planning for curative treatment. Materials and Methods: This was a retrospective observational study. The aim of our study was to evaluate the pattern of bone marrow involvement by different solid tumors and their correlation with the hematological abnormalities. We retrospectively evaluated bone marrow aspirations and biopsy performed in past 3 years. Results: At our institution, bone marrow examinations were performed in 440 patients during past 3 years for solid malignancies. Out of 440, 206 were pediatric cases and 234 were adult cases. Bone marrow was involved in 56 (12.7%) patients. Among the pediatric cases, bone marrow involvement was present in 30 (12.8%) cases, and in adult cases, bone marrow was involved was in 26 (11.1%) cases. Neuroblastoma (40%) was the most common malignancy, which involved the bone marrow among pediatric cases, followed by retinoblastoma (26.6%) and Ewing’s sarcoma (20%). Among adult patients, neuroendocrine carcinoma (23%) was at the top of the list of tumors involving bone marrow, which is followed by Ewing’s sarcoma (19.2%) and nasopharyngeal carcinoma (11.5%). Conclusion: Neuroblastoma and neuroendocrine carcinoma are the major cause of bone marrow involvement among the solid malignancies in pediatric and adult population, respectively. Use of immunohistochemistry markers on bone marrow biopsies may result in higher detection rate.
Moser’s shadow problem
Authors: Lagarias Jeffrey C. , Luo Yusheng , Padrol Arnau
Published: July 2019

Moser's shadow problem asks to estimate the shadow function

\mathfrak s_b(n)

, which is the largest number such that for each bounded convex polyhedron

P

with

n

vertices in 3-space there is some direction

\mathbf v

(depending on

P

) such that, when illuminated by parallel light rays from infinity in direction

\mathbf v

, the polyhedron casts a shadow having at least

\mathfrak s_b(n)

vertices. A general version of the problem allows unbounded polyhedra as well, and has associated shadow function

\mathfrak s_u(n)

. This paper presents correct order of magnitude asymptotic bounds on these functions. The bounded shadow problem has answer

\mathfrak s_b(n) = \Theta \big( \log (n)/ (\log(\log (n))\big).

The unbounded shadow problem is shown to have the different asymptotic growth rate

\mathfrak s_u(n) = \Theta \big(1\big)

. Results on the bounded shadow problem follow from 1989 work of Chazelle, Edelsbrunner and Guibas on the (bounded) silhouette span number

\mathfrak s^*_b(n)

, defined analogously but with arbitrary light sources. We complete the picture by showing that the unbounded silhouette span number

\mathfrak s^*_u(n)

grows as

\Theta \big( \log (n)/ (\log(\log (n))\big)

.
A sixteen-relator presentation of an infinite hyperbolic Kazhdan group
Authors: Caprace Pierre-Emmanuel
Published: July 2019

We provide an explicit presentation of an infinite hyperbolic Kazhdan group with 4 generators and 16 relators of length at most 73. That group acts properly and cocompactly on a hyperbolic triangle building of type (3, 4, 4). We also point out a variation of the construction that yields examples of lattices in

\tilde A_2

-buildings admitting non-Desarguesian residues of arbitrary prime power order.
On a linearization trick
Authors: Pisier Gilles
Published: July 2019

In several situations, mainly involving a self-adjoint set of unitary generators of a

C^*

-algebra, we show that any matrix polynomial in the generators and the unit that is in the open unit ball can be written as a product of matrix polynomials of degree 1 also in the open unit ball.
Framing 3-manifolds with bare hands
Authors: Benedetti Riccardo , Lisca Paolo
Published: July 2019

After surveying existing proofs that every closed, orientable 3-manifold is parallelizable, we give three proofs using minimal background. In particular, our proofs do not rely on spin structures, the theory of Stiefel–Whitney classes, nor the Lickorish–Wallace theorem.
Бирационально жесткие полные пересечения высокой коразмерности
Authors: Evans Daniel , Pukhlikov Aleksandr Valentinovich
Published: July 2019

Доказана бирациональная сверхжесткость полных пересечений Фано коразмерности $k$ индекса $1$ в комплексном проективном пространстве ${\mathbb P}^{M+k}$ при $k\geqslant 20$ и $M\geqslant 8k\log k$, имеющих, самое большее, мультиквадратичные особенности. Показано, что коразмерность дополнения к множеству бирационально сверхжестких полных пересечений в естественном пространстве параметров не меньше, чем $(M-5k)(M-6k)/2$. Доказательство основано на технике гиперкасательных дивизоров в сочетании с недавно открытым $4n^2$-неравенством для особенностей полного пересечения.
Библиография: 23 наименования.
Complexidade econômica e desequilíbrios regionais em Santa Catarina
Authors: Garcez Lucas Cidade , Arend Marcelo , Giovanini Adilson
Published: July 2019

Este estudo procura analisar a estrutura produtiva do Estado de Santa Catarina através da perspectiva da complexidade econômica. Pretende-se comparar a matriz produtiva catarinense com as demais unidades federativas brasileiras, bem como diferenciar a complexidade dos produtos e a diversidade produtiva de cada mesorregião catarinense. Dessa forma, o artigo procura responder os seguintes questionamentos: 1) Os principais produtos exportados por Santa Catarina apresentam, em geral, qual grau de complexidade? 2) Qual a complexidade e diversidade apresentada pela economia catarinense, se comparada com a pauta exportadora dos demais estados brasileiros? 3) Quais mesorregiões catarinenses apresentam uma pauta de exportação mais diversificada e com produtos mais sofisticados? O artigo conclui que existe grande diferenciação econômica entre as mesorregiões. A alta complexidade se concentra principalmente no Norte Catarinense e em parte no Vale do Itajaí. Ocorre a existência de pequenos pólos de maior complexidade econômica localizados em poucos municípios do Estado. Por outro lado, Santa Catarina se apresenta bem posicionada se comparada ao restante do país, com uma diversidade produtiva considerável e maior desenvolvimento dos setores de maquinário, químicos e instrumentos, considerados em geral os mais complexos.
Por que alguns estabelecimentos agropecuários superam outros em Santa Catarina? Uma visão baseada em recursos (VBR)
Authors: Araujo Luis Augusto , Catapan Elizabete , Mondardo Marcia
Published: July 2019

A Visão Baseada em Recursos preconiza que os estabelecimentos agropecuários se destacariam de outros em termos de desempenho econômico devido a posse e utilização de recursos estratégicos. O artigo objetiva analisar a associação existente entre a heterogeneidade do desempenho de estabelecimentos agropecuários de Santa Catarina e as capacidades dos seus recursos percebidas pelos agricultores. É um estudo com abordagem de pesquisa quantitativa e os dados tratados com estatísticas descritivas, testes de médias e análise de correlação. Os resultados sugerem haver evidencias de que a capacidade de comercialização e marketing e de gestão da informação estão associadas com a renda. Além disso, sugerem que as médias e as variâncias de desempenho econômico dos estabelecimentos são estatisticamente iguais, tanto em relação ao sistema de produção como em relação ao ano agrícola.
Joinville como fonte de economias externas às empresas atendidas pelo programa ALI
Authors: Bilicki Stéfanie , Bittencourt Pablo Felipe
Published: July 2019

Percebendo o contexto econômico e político em que estão inseridas, as MPEs precisam buscar diferenciação através de ações inovadoras. Para tanto, é necessário acessar as informações disponíveis, tanto do ambiente interno quanto do externo, e aproveitar-se das externalidades. Este estudo, através de método descritivo exploratório, faz uma análise dos resultados obtidos na dimensão Ambiência Inovadora, que procura mensurar as ações empresariais na busca por conhecimento e analisar o impacto dessas ações nas outras dimensões do Radar de Inovação, sendo o radar uma metodologia utilizada pelo Programa ALI – Sebrae/CNPq. A pesquisa foi realizada com os dados de 20 empresas atendidas pelo programa em Joinville/SC, de novembro de 2015 a agosto de 2017, e os resultados, exemplificados por dois casos, apontam para a importância de ações orientadas a aproveitar o conhecimento disponível.
Design and Analysis of Flexible Hinge Used for Unfolding Spacecraft Solar Panels
Authors: Zhang Jing , Yan Kai , Kou Ziming
Published: July 2019

Two stiffness models for a flexible hinge with large rotation angle are established based on the pseudo-rigid body method and the series or parallel relationship of flexible units. Finite element simulation of the flexible hinge is conducted in ANSYS to verify the two stiffness models of the flexible hinge. A multi-objective optimization method is used to optimize the design parameters of the hinge. The stiffness models of the flexible hinge are used to establish the optimized objective function of an optimization model to improve the rotation angle of the hinge under a certain radial stiffness. After optimization, the rotation angle can reach 70 deg when the rotational and radial stiffnesses are 1.29 N·mm/rad and 1.37 N/mm.
Wet Days in the Dry Quarter of the Alcântara Launch Center Region: Observational Features
Authors: César Silva da Costa Paulo , Daisuke Oyama Marcos , de Fátima Cruz Marques Rosa
Published: July 2019

Precipitation events are infrequent in the dry quarter (SON) of the Alcântara Launch Center (Centro de Lançamento de Alcântara, CLA), the main launch site of the Brazilian Space Program. However, their occurrence could be a risk for activities during launch missions. In this work, the observational features of wet days (daily precipitation total ≥ 1 mm/day) in the dry quarter of the CLA region were studied. Daily precipitation totals over the course of 37 years (1979-2016, except 2006), outgoing longwave radiation (OLR) data and ERA-Interim reanalysis data were used. On average, in the dry quarter, there were 9 wet days, which accumulated 32 mm. The number and quarterly precipitation total of wet days showed pronounced interannual variability. This variability was negatively and significantly correlated with the interhemispheric sea surface temperature anomalies gradient in the Atlantic Ocean and the wind speed at 925 hPa over the CLA region. Based on a theoretical distribution (log-normal), the probability of occurrence of heavy precipitation days (daily total ≥ 10 mm/day) was only 0.5%. For days with heavy precipitation and deep convection (OLR ≤ 230 W·m-2), over a large area along the northeastern coast of South America including the CLA region, negative OLR differences (from the mean) and the strengthening of favorable conditions for deep convection were found. The large-scale organization of the convective activity and atmospheric features for higher precipitation events obtained in this work could be helpful for nowcasting and short-range weather forecasting during launch missions at the CLA.
Reassessment of the common concept to derive the surface cloud radiative forcing in the Arctic: Consideration of surface albedo – cloud interactions
Authors: Stapf Johannes , Ehrlich André , Jäkel Evelyn , Lüpkes Christof , Wendisch Manfred
Published: July 2019

Abstract. The concept of cloud radiative forcing (CRF) is commonly used to quantify the warming or cooling effect due to clouds on the radiative energy budget (REB). In the Arctic, radiative interactions between micro- and macrophysical properties of clouds and the surface influence the CRF and complicate its estimate obtained from observations or models. In this study the individual components and processes related to the surface CRF are analysed separately using simulations and measurement from low-level airborne observations of the REB in the heterogeneous springtime marginal sea ice zone (MIZ). The measurements were obtained during the Arctic CLoud Observations Using airborne measurements during polar Day (ACLOUD) campaign. The effect of changing surface albedo, due to the presence of clouds, and its dependence on cloud optical thickness was found to be relevant for the estimation of the solar CRF. A method to correct this albedo effect by retrieving the cloud-free surface albedo from observations under cloudy conditions is proposed. The application of this new concept to ACLOUD data shows, that the estimated average solar cooling effect by clouds almost doubles over snow and ice covered surfaces (−63 W m−2 instead of −33 W m−2), if surface albedo-cloud interactions are considered. Concerning the seasonal cycle of the surface albedo, this effect would potentially enhance solar cooling in periods where cold snow and ice dominate the surface and weaken the cooling by optical thin clouds and surface albedos commonly found during the summertime Arctic melting season. These findings suggest, that the surface albedo-cloud interaction needs to be represented in global climate models and in long-term observations to obtain a realistic estimate of the solar CRF and a reasonable representation of cloud radiative feedback mechanisms in the Arctic and to quantify the role of clouds in Arctic amplification.
Development and testing of scenarios for implementing Holocene LULC in Earth System Model Experiments
Authors: Harrison Sandy P. , Gaillard Marie-José , Stocker Benjamin D. , Vander Linden Marc , Klein Goldewijk Kees , Boles Oliver , Braconnot Pascale , Dawson Andria , Fluet-Chouinard Etienne , Kaplan Jed O. , Kastner Thomas , Pausata Francesco S. R. , Robinson Erick , Whitehouse Nicki J. , Madella Marco , Morrison Kathleen D.
Published: July 2019

Abstract. Anthropogenic changes in land use and land cover (LULC) during the pre-industrial Holocene could have affected regional and global climate. Current LULC scenarios are based on relatively simple assumptions and highly uncertain estimates of population changes through time. Archaeological and palaeoenvironmental reconstructions have the potential to refine these assumptions and estimates. The Past Global Changes (PAGES) LandCover6k initiative is working towards improved reconstructions of LULC globally. In this paper, we document the types of archaeological data that are being collated and how they will be used to improve LULC reconstructions. Given the large methodological uncertainties involved, we propose methods to evaluate the revised scenarios by using independent pollen-based reconstructions of land cover and of climate. A further test involves carbon-cycle simulations to determine whether the LULC reconstructions are consistent with constraints provided by ice-core records of CO2 evolution and modern-day LULC. Finally, we outline a protocol for using the improved LULC reconstructions in palaeoclimate simulations within the framework of the Palaeoclimate Modelling Intercomparison Project in order to quantify the magnitude of anthropogenic impacts on climate through time and ultimately to improve the realism of Holocene climate simulations.
Short-term forecasting of regional biospheric CO2 fluxes in Europe using a light-use-efficiency model
Authors: Chen Jinxuan , Gerbig Christoph , Marshall Julia , Totsche Kai Uwe
Published: July 2019

Abstract. Forecasting atmospheric CO2 concentrations on synoptic time scales (~ days) can benefit the planning of field campaigns by better predicting the location of important gradients. One aspect of this, accurately predicting the day-to-day variation in biospheric fluxes poses a major challenge. This research aims to investigate the feasibility of using a diagnostic light-use-efficiency model, the Vegetation Photosynthesis Respiration Model (VPRM), to forecast biospheric CO2 fluxes on the time scale of a few days. As input the VPRM model requires downward shortwave radiation, 2 m temperature, and Enhanced Vegetation Index (EVI) and Land Surface Water Index (LSWI), both of which are calculated from MODIS reflectance measurements. Flux forecasts were performed by extrapolating the model input into the future, i.e. using downward shortwave radiation and temperature from a numerical weather prediction (NWP) model, as well as extrapolating the MODIS indices to calculate future biospheric CO2 fluxes with VPRM. A hindcast for biospheric CO2 fluxes in Europe in 2014 has been done and compared to eddy covariance flux measurements to assess the uncertainty from different aspects of the forecasting system. In total the range-normalized mean absolute error (normalized) of the 5 day flux forecast at daily timescales is 7.1 %, while the error for the model itself is 15.9 %. The largest forecast error source comes from the meteorological data, which fail to accurately predict cloud cover, leading to overestimated shortwave radiation in the model. The error contribution from all error sources is similar at each flux observation site, and is not significantly dependent on vegetation type.
Studying the processing of food dye from beet juice
Authors: Sheiko Tamila , Tkachenko Serhii , Mushtruk Mikhailo , Vasyliv Volodymyr , Deviatko Olena , Mukoid Roman , Bilko Marina , Bondar Mykola
Published: July 2019

The manuscript describes a new method of red beet processing and the technology of manufacturing food colorant from the juice concentrate, which is natural, safe and useful analogue to existing expensive offers on the market of similar goods that have chemical origin not useful for regular consumption. Nowadays in order to give to food products a colour, close to natural coloring of fruits and vegetables, expensive synthetic dyes are used, which might have cancer-inducing effect when being accumulated by human organism. Therefore improving the technology for producing food grade dye from red beet juice is remarkably important task. Currently, there is a problem for vegetable processors - pectin substances complicate the process, like the illumination of juice and negatively affect its storage capacity. The article below reveals and substantiates the necessity of using a natural carbon-containing adsorbent shungite for the purification of beet juice from pectin substances. On the basis of the study, the authors suggest a more cost-effective way of producing a food dye from juice concentrate, which allows avoiding usage of expensive enzyme processing additives.
Denominators Matter: Understanding Medical Encounter Frequency and Its Impact on
Surveillance Estimates Using EHR Data
Authors: Cocoros Noelle M. , Ochoa Aileen , Eberhardt Karen , Zambarano Bob , Klompas Michael
Published: July 2019

Background: There is scant guidance for defining what denominator to use when
estimating disease prevalence via electronic health record (EHR) data.Objectives:
Describe the intervals between medical encounters to inform the selection of
denominators for population-level disease rates, and evaluate the impact of different
denominators on the prevalence of chronic conditions.Methods: We analyzed the EHRs of
three practices in Massachusetts using the Electronic medical record Support for Public
Health (ESP) system. We identified adult patients’ first medical encounter per year
(2011–2016) and counted days to next encounter. We estimated the prevalence of asthma,
hypertension, obesity, and smoking using different denominators in 2016: ≥1 encounter in
the past one year or two years and ≥2 encounters in the past one year or two
years.Results: In 2011–2016, 1,824,011 patients had 28,181,334 medical encounters. The
median interval between encounters was 46, 56, and 66 days, depending on practice. Among
patients with one visit in 2014, 82–84 percent had their next encounter within 1 year;
87–91 percent had their next encounter within two years. Increasing the encounter
interval from one to two years increased the denominator by 23 percent. The prevalence
of asthma, hypertension, and obesity increased with successively stricter denominators –
e.g., the prevalence of obesity was 24.1 percent among those with ≥1 encounter in the
past two years, 26.3 percent among those with ≥1 encounter in the last one year, and
28.5 percent among those with ≥2 encounters in the past one year.Conclusions: Prevalence
estimates for chronic conditions can vary by >20 percent depending upon denominator.
Understanding such differences will inform which denominator definition is best to be
used for the need at hand.
Performance-Driven Public Sector Rewards - A Resident Evil?
Authors: Rajmohan Manuelpillai R. , Wongsurawat Winai
Published: July 2019

Achieving administration changes and utilizing current change management methods demand striking a harmony between representative fulfillment and operational execution. In this scenario in an institution such as Sri Lanka Customs, it is discovered that a motivator called ‘rewards’ takes the center stage between operational execution and representative fulfillment. This contextual analysis dissects different components of this unique 150-year-old, 50/50, ‘pay half the catch’ rewards scheme that has not yet been made known to the outside modern world. The research methodology includes a case study of a major institution that contributes 51% of the government revenue in Sri Lanka. It carries out the investigation through a survey and interview. The data showed complex results, demonstrating a dichotomy between the Customs (public) officers and the stakeholders in international trade. Both the interior perspective of the employees and the exterior perspective of the partners are reviewed in this exploratory contextual investigation to formulate a basis for discussion of change management in the public sector. This may be the first time such in-depth analyses have been undertaken from inside the organization. More than 180 customs administrations in the world face a similar situation and dilemma, and it is believed that the findings and analysis in this live illustration may be immensely useful for rethinking or reformulating their change management strategies.