bluuebunny/crossref_metadata_2025 huggingface dataset:
The Effect of Firm Sizes, Profitability, Dividend Policy, Asset Structure, Sales Growth and Free Cash Flow on Debt Policy
Authors: Nurdani Ria , Rahmawati Ika Yustina
Published: June 2020

The study aims to examine the effect of company size, profitability, dividend policy, asset structure, company growth and free cash flow on debt policy. The object of this study uses manufacturing companies listed on the Indonesia Stock Exchange. The data used is secondary data in the form of annual financial statements for the 2015-2018 period. The collection technique used in this study was purposive sampling while the data analysis techniques used in this study were descriptive statistics, classic assumption tests, multiple regression analysis and hypothesis testing. The analysis show that the size of the company has a negative and not significant effect on debt policy, profitability has a negative and significant effect on debt policy. Dividend policy variables and asset structure has a negative and significant effect on debt policy. While sales growth and free cash flow has no effect on debt policy.
Persepsi Mahasiswa tentang Sistem Informasi Akademik Perguruan Tinggi
Authors: Chairoel Lucy , Fitri Mellyna Eka Yan , Hastini Lasti Yossi
Published: June 2020

Perguruan tinggi yang baik adalah yang memiliki SIA yang baik untuk mahasiswa, dosen dan bagian administrasi akademik perguruan tinggi. Fasilitas SIA yang berkualitas akan menjadi nilai tambah bagi perguruan tinggi itu sendiri dan akhirnya manjadi suatu layanan yang utama bagi perguruan tinggi. Tujuan yang didapat dari penelitian ini adalah untuk mengetahui sebatas mana persepsi mahasiswa terhadap pelayanan sistem informasi akademik pada perguruang tinggi. Teknik pengumpulan sampel dalam penelitian ini menggunakan non probabilitas sampling karena pertimbangan biaya, waktu, dan penerimaan hasil. Dari design non probabilitas sampling maka penelitian ini menggunakan tehnik purposive sampling dengan kriteria adalah mahasiswa fakultas ekonomi dan bisnis prodi S1 manajemen yang pernah menggunakan SIA minimal sebanyak 2 kali. Dan jumlah sampel yang diperoleh sebanyak 61 responden. Terdapat lima variabel yang mengukur persepsi mahasiswa mengenai kinerja SIA Online yaitu variabel kemudahan penggunaan, kemanfaatan penggunaan, sikap penggunaan,  perilaku penggunaan dan penggunaan sesungguhnya. Teknik analisis data deskriptif yang digunakan adalah analisis Importance Performance Analysis (IPA) untuk mengukur pemetaan layanan dengan tujuan guna mengetahui persepsi mahasiswa mengenai kualitas pelayanan SIA dan analisa rentang kriteria guna mengetahui posisi kualitas layanan tersebut..  Pada variabel kemanfataan penggunaan menjadi prioritas utama untuk diperbaiki karena berada pada kuadran pertama di Kuadran IPA dan variabel kemanfaatan penggunaan memiliki skor 152 yang berada pada rentang tidak memuaskan.
El acceso a la universidad en estudiantes con discapacidad: la influencia de la orientación educativa en la elección de estudios de grado
Authors: López Bastías José Luis , Moreno Ricardo , Espada Chavarría Rosa
Published: June 2020

El número de alumnos con discapacidad que decide matricularse en estudios universitarios de grado ha aumentado durante los últimos años. No obstante, si bien es verdad que la inclusión educativa ha favorecido la calidad y la permanencia de éstos en los niveles de Educación Secundaria y Bachillerato, la proporción de estudiantes con discapacidad que accede a la Universidad sigue siendo minúscula si es comparada con el resto del alumnado. El presente trabajo analiza la influencia que ha ejercido la orientación académica en la elección de estudios de grado en estudiantes con discapacidad que actualmente estudian en la Universidad XXX. Para ello, se ha realizado un estudio a 82 estudiantes con discapacidad. Los resultados muestran la aparición de otros factores, considerados como más importantes a la acción del orientador educativo en la elección de estudios universitarios. A su vez, se considera que la orientación académica llevada a cabo en los centros educativos de origen se realizó en momentos puntuales y se tuvo en cuenta, de manera prioritaria, otros factores diferentes a los del área de intereses y valores de los estudiantes. Se constata la necesidad de colaboración entre los centros universitarios y los centros de educación secundaria para favorecer la transición instituto-universidad
Percepción de la cultura de seguridad del paciente en enfermeros de atención primaria
Authors: Vega-Ramírez Francisco Antonio , Gimenez-Salazar Javier , López Liria Remedios
Published: June 2020

Objetivo: describir la percepción que tienen 201 enfermeros en relación a la Seguridad del Paciente (SP) en sus centros, valorar cuáles son los puntos fuertes y las áreas de mejora en los Distritos Sanitarios de la provincia de Almería.Metodología: Se ha utilizado el cuestionario denominado MOSPSC (Medical Office Survey on Patient Safety Culture), traducido, adaptado y validado para profesionales españoles de Atención Primaria. A través del programa estadístico SPSS, se calculó la media y el intervalo de confianza al 95% de cada una de las dimensiones del cuestionario.Resultados: se observa una percepción positiva de la SP en casi todas las dimensiones, a excepción de la “Comunicación sobre el error”, el “Seguimiento de la atención a los pacientes”, la “Comunicación franca” y el “Ritmo y Carga de trabajo”. Uno de los puntos fuertes de los enfermeros es el “trabajo en equipo”.Conclusiones: Los resultados de esta investigación también han destacado “el intercambio de información con otros equipos”; en cambio, entre las áreas de mejora que deberían tenerse en cuenta se halla, “la Comunicación franca y sobre el error”. Estos resultados deberían ayudar a evaluar la importancia de la SP en las organizaciones, para dialogar sobre los errores y crear un clima de aprendizaje y deseo de mejora en los profesionales que repercuta en la calidad de la atención ofrecida a los usuarios.
Aspectos farmacológicos da terapia medicamentosa utilizada para a leishmaniose cutânea: uma revisão de literatura
Authors: Wyrepkowski Claudia Dantas Comandolli , Wyrepkowski Claudia Dantas Comandolli , Paz Andréia da Costa , Jensen Bruno Bezerra , Franco Antonia Maria Ramos
Published: June 2020

Objetivo: Descrever o arsenal terapêutico utilizado para o tratamento da Leishmaniose Cutânea (LC), revisando a literatura científica que tenha abordagem nos aspetos farmacológicos. Métodos: Revisão publicados em revistas indexadas em bases de dados como ScienceDirect, PubMed e Scielo, e manuais publicados pelo Ministério da Saúde e OMS, sendo os critérios: ser publicados entre os últimos 20 anos, que abordassem estudos com a farmacoterapia atual e alternativas farmacológicas para o tratamento da LC. Resultados: Foram encontrados 1957 artigos, sendo 1690 artigos no ScienceDirect, 206 no PubMed e 61 no Scielo.  Artigos que relatavam novos fármacos promissores para LC, ou associações de fármacos já utilizados na terapia convencional com novas substâncias correspondiam a 27,59% do total.  Outros aspectos da farmacoterapia amplamente abordados foram inovações no esquema terapêutico ou formulação, mas poucos trabalhos relatavam o mecanismo de ação. Fármacos como antimoniato de meglumina, isotionato de pentamidina e anfotericina B são os mais utilizados na terapia da LC, e possíveis mecanismos de ação na célula de Leishmania foram revisados. Considerações finais: O arsenal terapêutico para a LC ainda é limitado, e pouca inovação tem ocorrido nos últimos 20 anos, embora substâncias de origem natural vêm despertando interesse como possíveis novos alvos terapêuticos.
Abordagem multidisciplinar ao paciente oncológico adulto e idoso ostomizado: uma revisão narrativa
Authors: Cogo Silvana Bastos , Badke Márcio Rossato , Sehnem Graciela Dutra , Reisdorfer Ariele Priebe , Almeida Raquel Karlinski , Schumacher Stefani , Ferigollo Ariélen , Antunes Andrei , Ilha Aline Gomes , Malheiros Luiza Carolina Santos
Published: June 2020

Objetivo: Realizar uma revisão sobre os aspectos biopsicossociais bem como a atuação da esquipe multidisciplinar frente aos pacientes adultos e idosos oncológicos em uso de ostomias. Revisão bibliográfica: Inicialmente, foram selecionadas 30 publicações que apresentaram os critérios de inclusão. Posteriormente, a análise dos dados disponíveis na literatura nacional e internacional possibilitaram a descrição das atuais perspectivas epidemiológicas que evidenciam o crescimento dos novos casos de câncer associados a mudanças no perfil sociodemográfico da população. E assim, de forma concomitante, o crescimento das sequelas ocasionadas pelo tratamento antineoplásico, com destaque para o processo de ostomização. Esta revisão possibilitou a descrição dos tipos de ostomias, quais as possíveis complicações que o paciente pode apresentar e como se dá o processo de adaptação a esta nova condição. Considerações finais: O estudo demonstra a importância da abordagem multiprofissional na garantia da qualidade de vida na perspectiva biopsicossocial do paciente adulto e idoso oncológico ostomizado.
Análise da mortalidade por causas externas, Santa Catarina, 2008 a 2017
Authors: Fuck João Augusto Brancher , Assis Gláucia de Oliveira , Tornquist Carmen Susana
Published: June 2020

Objetivo: Analisar os óbitos por causas externas em Santa Catarina, no período de 2008 a 2017. Métodos: Estudo epidemiológico descritivo com dados secundários do Sistema de Informações sobre Mortalidade. Resultados: Os óbitos por causas externas não estão distribuídos de forma uniforme no território catarinense, com concentração em quatro regiões de saúde. Entre as principais causas estão os acidentes de transporte, as quedas e afogamentos, as agressões por armas de fogo e as lesões autoprovocadas por enforcamento. Os homens na faixa etária entre 20 a 49 anos são os mais afetados. As mortes em pessoas brancas representam 87,3% do total, embora as pessoas pretas e pardas morrem em proporções maiores na faixa etária entre 20 e 49 anos, assim como é maior o número de mortes por agressões. Conclusão: Os óbitos por causas externas em Santa Catarina afetam de forma diferente as pessoas segundo o sexo, cor e faixa etária.
Terapia Antirretroviral: principais causas de abandono no estado do Amapá
Authors: Mello Caren Julianne Filgueiras de Assis , Amaral Joyce Cristina Silva do , Costa Marcela da Silva , Cavalcante Maria de Nazaré Miranda , Rêgo Natássia Maia de Sá , Silva Liliany Mara Rodrigues da , Amaral Raquel Rodrigues do
Published: June 2020

Objetivo: Identificar causas de abandono a Terapia Antirretroviral (TARV) em pessoas vivendo com HIV/AIDS no estado do Amapá. Métodos: Estudo descritivo, documental, retrospectivo, com abordagem quantitativa, realizado no Serviço de Atendimento Especializado/Centro de Testagem e Aconselhamento (SAE/CTA), referência no estado do Amapá. Os dados foram obtidos em prontuários de indivíduos soropositivos admitidos no SAE/CTA de Macapá no período de Janeiro de 2017 a Julho de 2019 com registro superior a seis meses sem retirada da TARV. Resultados: Entre 228 prontuários selecionados, identificou-se predomínio do sexo masculino (64%), faixa etária entre 29 a 40 anos (38,2%), idade ao diagnóstico entre 21 a 31 anos (46,5%), procedentes da capital (74,1%), heterossexuais (48,7%), solteiros (53,1%) e inseridos no mercado formal (52, 6%). Quanto a caracterização clínica, não estavam gestantes (21,5%), não usavam drogas (55,3%), uso de TDF+3TC+DTG (59,7%). Sem troca de esquema inicial (73,7%) e (74,5%) com carga viral desatualizada. Identificou-se como causa de abandono ao tratamento, transtornos psiquiátricos (18%), ausência de suporte social afetivo (12,3%) e dificuldades para comparecer ao SAE (26%). Conclusão: identificar as causas de abandono possibilita elaborar planos de intervenção e construção de uma rede de cuidados com vistas a buscar alternativas para diminuir o abandono na sua gênese.
Perfil clínico-epidemiológico de pacientes portadores de hanseníase em um município do Maranhão
Authors: Silva Patrícia Samara Ribeiro da , Cunha Naylanny Gonçalves Torres , Oliveira Larissa Silva , Santos Maria Cleilda Araujo
Published: June 2020

Objetivo: Analisar o perfil clínico-epidemiológico de pacientes portadores de hanseníase em um município maranhense no período de 2015 a 2017. Métodos: Trata-se de uma pesquisa epidemiológica, retrospectiva, de caráter descritivo e abordagem quantitativa, na qual foram utilizados dados secundários provenientes do Sistema de Informação de Agravos de Notificação (SINAN). Foi utilizado o software Microsoft Excel 2013 para a tabulação dos dados e elaboração de gráficos e tabelas. Resultados: No período de 2015 a 2017 foram notificados 265 casos de hanseníase, com predomínio no sexo masculino (63%), na faixa etária de 30 a 39 anos (20%), maior ocorrência de casos multibacilares (89%), sendo a forma clínica dimorfa a mais frequente (66,4%). Quanto ao modo de entrada, a maioria dos casos foram registrados como caso novo (68,7%), o modo de detecção predominante foi a demanda espontânea (36%) e no que se refere ao grau de incapacidade física no diagnóstico, a maior parte dos pacientes apresentou grau 0 de incapacidade (44%). No tipo de saída, predominou a saída por cura (54%). Conclusão: A hanseníase continua sendo um problema de saúde pública na região, sendo necessário elaborar e implementar medidas que promovam a redução do agravo e possibilitem o enfrentamento da doença no município.
A saúde mental dos profissionais de saúde frente à pandemia do COVID-19: uma revisão integrativa
Authors: Prado Amanda Dornelas , Peixoto Bruna Cristina , Da Silva Andréa Mara Bernardes , Scalia Luana Araújo Macedo
Published: June 2020

Objetivo: Conhecer a situação da saúde mental dos profissionais da área da saúde da linha de frente na pandemia do COVID-19, e quais consequências para os serviços de saúde. Métodos: Trata-se de uma revisão integrativa de literatura e foi realizada nas bases de dados LILACS, MEDLINE pela biblioteca virtual da Saúde, na PUBMED e Scielo, usando descritores: Saúde mental / Mental health / Salud mental, Covid – 19 / Covid – 19 / Covid – 19, Profissional de saúde/ Health Personnel / Personal de Salud, Serviços de Saúde / Health Services / Servicios de Salud. Resultados: Foram selecionados 8 artigos para essa revisão. A partir da leitura dos artigos percebeu-se a fragilidade na saúde mental do trabalhador da saúde, dentro de incertezas do futuro e da cura do vírus COVID-19. Dessa forma, percebe-se altos índices de ansiedade, estresse, depressão, medo, angústia e sono alterado, doenças e muitas vezes esse profissional não procura ajuda para si mesmo. Considerações finais: O índice de sintomas psiquiátricos que já é alarmante normalmente no trabalhador da saúde, durante a pandemia tem se agravado. As organizações de Saúde precisam se atentar a isso e organizar maneiras de melhorar o bem-estar desses profissionais.
Ultrasound biomicroscopy evaluation of pseudophakic pupillary block by vitreous prolapse after Nd:YAG laser posterior capsulotomy
Authors: Lucas Agustín Nicolas , Pedalino Agustín , Anauati Ana Paula , Catalano Clarisa
Published: June 2020

Intraocular pressure rise is a common complication after neodymium:yttrium-aluminum-garnet (Nd-YAG) laser posterior capsulotomy. Although in most cases it is related to an inflammatory response, there are other possible mechanisms such as misdirection syndrome and pupillary block. The authors report two cases of pupillary block by vitreous prolapse after Nd-YAG laser posterior capsulotomy evaluated by ultrasound biomicroscopy (UBM). UBM allows to differentiate possible causes of intraocular pressure rising after laser capsulotomy even in cases of corneal opacity. It also allows to detect intraocular lens dislocation, sometimes associated with this situation. This is the first report that describes the characteristics of UBM images of this complication.
Spor Seyircileri için Dışsal ve İçsel Güdü Ölçekleri Kısa Versiyon Uyarlaması ve Çok Değişkenli İlişkisel Bir Uygulama
Authors: POLAT Ercan , YALÇIN Hasan Birol
Published: June 2020

Bu çalışmada, daha kısa ve kullanışlı olması için Spor Seyircileri İçin Dışsal Güdü Ölçeği (SSİDGÖ) ile Spor Seyircileri İçin İçsel Güdü Ölçeği’ne (SSİİGÖ) Doğrulayıcı Faktör Analizi (DFA) uygulanması ve bunun yanısıra ilişkilerin kanonik korelasyon analizi yöntemiyle incelenmesi amaçlanmıştır. İlişkisel tarama modeli uygulanarak gerçekleştirilen araştırmanın çalışma grubunu, spor müsabakalarını seyreden ve bir üniversitenin farklı bölümlerde okuyan 310 gönüllü öğrenciler oluşmuştur. Çalışmada veri toplama aracı olarak Polat ve Yalçın (2014) tarafından geliştirilmiş olan, Spor Seyircileri İçin Dışsal Güdü Ölçeği (SSİDGÖ) ve Spor Seyircileri İçin İçsel Güdü Ölçeği (SSİİGÖ) kullanılmıştır. Geliştirilen ölçeklerin model yapısını test etmek amacıyla birinci düzey DFA ve sonrasında ise güvenilirlik analizleri yapılmıştır. Bu analizler için LISREL ve SPSS paket programı kullanılmıştır. Ayrıca NCSS istatistik programı kullanılarak ölçekler arası çoklu ilişkileri belirlemek amacıyla Kanonik Korelasyon analizi yapılmıştır. İki ölçek için de ilk yapılan DFA analizlerine göre; SSİDGÖ için 9 alt boyutlu yapı korunmuş, 34 olan madde sayısı ise 25’e düşürülmüştür. SSİİGÖ için ise yine 7 alt boyut değişmezken 40 maddeli ölçek 21’e düşürülmüştür. Kanonik korelasyon sonuçları incelendiğinde ilk dört değişken çiftinin anlamlı olduğu bulunmuştur. Anlamlı ilk iki değişken çiftine göre dışsal seyretme güdülerinden oluşan bağımsız değişkenlerin içsel seyretme güdülerinden oluşan bağımlı değişkenleri %71 oranında açıkladığı belirlenmiştir. İlk değişken çiftinde ise dışsal güdülerden Oyun Bilgisi boyutu, içsel güdülerden ise Beceri Düzeyi boyutu en çok ilişkisel katkıyı yapmıştır. Bu sonuca göre, seyircilerin spora ilişkin bilgi düzeyinin ve sporcuların yansıttığı sportif becerilerin diğer güdülerin gelişim ve etkileşiminde daha önemli etkilerinin olduğu söylenebilir.
Shear-Induced Microporous Nanocomposite Epoxy Thermosets (MiNET)
Authors: Hasan Molla , Patel Yogin , Gamboa Arielle R. , Grzenda Michael , Saro-Cortes Valeria , Mhatre Vivek , Singer Jonathan
Published: June 2020

To create microporous nanocomposite epoxy thermosets (MiNET), a mixing pathway is demonstrated in which a bicontinuous emulsion gel (bijel) like viscous fluid is kinetically trapped by high shear mixing of immiscible liquids, surfactant, and nanoparticles. The MiNETs are prepared from common ingredients, that are widely employed in industry, including epoxy resin, vegetable oil, epoxidized soybean oil, and different types of nanoparticles such as silica, activated carbon, alumina, and zinc oxide. MiNETs prepared by the presented route are processed at ambient conditions and exhibit low shrinkage (less than 2%). Furthermore, they are suitable to erect macro- to microscale structures with high precision and various porosity. The interconnected porous architecture of MiNET is even preserved in microscale features and thus ensures the mass transport in microstructures. With facile processability and tunability of pore sizes in a wide range (~100 nm to few microns), the proposed route overcomes the two major roadblocks – difficulty in fabrication and large domain size (on the order of 5µm or larger) – of bijel-like materials to apply in catalysis, energy storage, and molecular encapsulation.
Solid-State Laser Refrigeration at GPa Pressures
Authors: Ganas Abbie S. , Dobretsova Elena , Pant Anupum , Journaux Baptiste , Xia Xiaojing , Felsted Robert G. , Pauzauskie Peter
Published: June 2020

Although solid-state laser-refrigeration recently has been demonstrated to reach cryogenic temperatures in vacuum, to date the solid-state laser refrigeration of materials at elevated pressure conditions has remained unexplored. Here we demonstrate the laser cooling of ytterbium-doped yttirum-lithium-fluoride (10%Yb3+:YLiF4, or Yb:YLF)>17K below room temperature at pressures >4 GPa in a diamond anvil cell using lithium fluoride and ice-VII as a quasi-hydrostatic pressure media. Temperature measurements are quantified using a ratiometric-thermometry approach involving a Boltzmann fit to excited states distribution through 4f-4f Stark-level transitions from the Yb3+ ions that occur between the 2F5/2 and 2F7/2 manifolds. At pressures between 7 and 12 GPa the YLF grains are observed to undergo a martensitic phase transition from a tetragonal scheelite phase (space group I41/a, Z = 4, No. 88) to a monoclinic fergusonite phase (space group I2/a, Z = 4, No. 15) which modifies the crys-tal field splitting of the ground- and excited- state manifolds, but is observed to not eliminate laser cooling. Solid-state laser refrigeration at extreme pressures could allow researchers to use rapid photothermal cycling to explore temperature-dependent properties of materials, including electronic-structure phase-transitions, without the need for external cryostats.
Utilization of Multicomponent High Entropy Alloys for Production of Hydrogen via Oxidation of Hydrazine
Authors: Kumar Nirmal , dhakar shikha , Biswas Krishanu , Tiwary Chandra Sekhar , Sharma Dr Sudhanshu
Published: June 2020

A variety of research endeavors are directed to development of an alternative energy pathway of fossil fuels, which can reduce the emission of CO2, CO, due to burning of fossil fuels and reduce our over dependence on the fossile fuels.. In this regard, we report here, the generation of H2, a convenient, eco-friendly fuel from the Hydrazine oxidation reaction (HzOR) at room temperature. An intriguingly superior high entropy nano-catalyst comprises of five elements (Ag, Au, Pt, Pd, Cu) prepared by the casting-cum-cryomilling method, which endowed with unique catalytic activity was explored for HzOR. The continuous production of H2 elucidated that the catalyst is quite stable for the HzOR reaction at low overpotential, with no sign of ammonia formation. The reaction pathways leading to generation of hydrogen with nitrogen are discussed and deliberated.
Network Representation Learning-Based Drug Mechanism Discovery and Anti-Inflammatory Response Against COVID-19
Authors: Xiaoqi Wang , Xin Bin , Xu Zhijian , LI Kenli , Li Fei , Zhong Wu , Tan Weihong , Peng Shaoliang
Published: June 2020

Recent studies have been demonstrated that host immune imbalance is an important factors leading to acute respiratory distress syndrome (ARDS) in COVID-19 patients. Therefore, discovery of potential drugs and identification of their mechanisms of action for the prevention of immune imbalance in COVID-19 patients are urgently needed. In this study, we proposed a network representation learning-based methodology, termed AIdrug2cov, to discover drug mechanism and anti-inflammatory response for patients with COVID19. In AIdrug2cov, a deep bidirectional Transformer encoder network representation approach is developed to automatically learn lowdimensional vector of heterogeneous network. Using the representation vectors, AIdrug2cov identifies 40 potential targets and 24 high-confidence drugs that bind to tumor necrosis factor(TNF)-α or interleukin(IL)-6 to prevent excessive inflammatory responses in COVID-19 patients. In particular, AIdrug2cov indicated that chloroquine and hydroxychloroquine are able to reduce fatality of COVID-19 patients, and that their mechanisms of action are likely mediated through their inhibition of inflammatory cytokines on top of their antiviral ability, consistent with the findings of clinical studies. In addition, the results in 5 pharmacological application suggested that AIdrug2cov significantly outperforms 5 other state-of-the-art network representation approaches, future demonstrating the availability of AIdrug2cov in drug development field. In summary, AIdrug2cov is practically useful for accelerating COVID-19 therapeutic development. The source code and data can be downloaded from https://github.com/pengsl-lab/AIdrug2cov.git
Zinc Protoporphyrin–trimethylamine-N-Oxide Complex Involves Cholesterol Oxidation Causing Atherosclerosis
Authors: Paul, Navendu , Sarkar Rudra , Sarkar Sabyasachi
Published: June 2020

Trimethylamine-N-oxide (TMAO) has recently been correlated as biomarker for atherosclerosis. In a model study, we show that the free TMAO when bonded with zincprotoporphyrin IX, [ZnPP], in blood plasma as [TMAOZnPP] is transported to the lipid site is the reacting species to oxidize cholesterol causing atherosclerosis
Simulating the Ghost: Quantum Dynamics of the Solvated Electron
Authors: Lan Jinggang , Kapil Venkat , Gasparotto Piero , Ceriotti Michele , Iannuzzi Marcella , Rybkin Vladimir V.
Published: June 2020

The nature of bulk hydrated electron has been a challenge for both experiment and theory due to its short life time and high reactivity, and the need for a high-level of electronic structure theory to achieve predictive accuracy. The lack of a classical atomistic structural formula makes it exceedingly difficult to model the solvated electron using conventional empirical force fields, which describe the system in terms of interactions between point particles associated with atomic nuclei. Here we overcome this problem using a machine-learning model, that is sufficiently flexible to describe the effect of the excess electron on the structure of the surrounding water, without including the electron in the model explicitly. The resulting potential is not only able to reproduce the stable cavity structure, but also recovers the correct localization dynamics that follows the injection of an electron in neat water. The machine learning model achieves the accuracy of the state-of-the-art correlated wave function method it is trained on. It is sufficiently inexpensive to afford a full quantum statistical and dynamical description, and allows us to achieve a highly accurate determination of the structure, diffusion mechanisms and vibrational spectroscopy of the solvated electron
Crack Tip Field of a Double-Network Gel: Visualizing Covalent Bond Scission by Mechanoradical Polymerization
Authors: Matsuda Takahiro , Kawakami Runa , Nakajima Tasuku , Gong Jian Ping
Published: June 2020

Quantitative characterization of the energy dissipative zone around the crack tip is the central issue in fracture mechanics of soft materials. In this research, we present a mechanochemical technique to visualize the bond scission of the first network in the damage zone of tough double-network hydrogels. The mechanoradicals generated by polymer chain scission are employed to initiate polymerization of a thermoresponsive polymer, which is visualized by a fluorophore. This technique records the spatial distribution of internal fracturing from the fractured surface to the bulk, which provides the spatial profiles of stress, strain, and energy dissipation around the crack-tip. The characterized results suggest that, in addition to the dissipation in relatively narrow yielded zone which is mostly focused in the previous works, the dissipation in wide pre-yielding zone and the intrinsic fracture energy have also significant contribution to the fracture energy of a DN gel.
Synthesis of Atomically Precise Single-Crystalline Ru2-Based Coordination Polymers
Authors: Gao Wen-Yang , Van Trieste Gerard , Powers David
Published: June 2020

Methods to incorporate kinetically inert metal nodes and highly basic ligands into single-crystalline metal-organic frameworks (MOFs) are scarce, which prevents synthesis and systematic variation of many potential heterogeneous catalyst materials. Here we demonstrate that metallopolymerization of kinetically inert Ru2 metallomonomers via labile Ag–N bonds provides access to a family of atomically precise single-crystalline Ru2-based coordination polymers with varied network topology and primary coordination sphere.
The Effectiveness of a 3D Printed Hydrogel Membrane to Sustain Algal Growth
Authors: Caroway Ben , Malo Satchel , Parsons Frank
Published: June 2020

This experiment assessed whether the photosynthetic algae species Chlorella Vulgaris could growth within a carrageenan based hydrogel. This hydrogel variant was synthesized with a nanosilicate powder, used to strengthen the polymer bonds between the carrageenan which allows for more robust 3D printing. Using a chip hemocytometer, it was found that Chlorella Vulgaris showed signs of growth in the carrageenan hydrogel without the aid of additional nutrients.This means that the algae could potentially be 3D printed into structures used for biofiltration of enviromental pollutants
Kemampuan Literasi Membaca Siswa Indonesia (Berdasarkan hasil UN dan PISA)
Authors: Liestari Suci Paramitha , Muhardis Muhardis
Published: June 2020

National Literacy Movement (GLN) in Permendikbud No. 23/2015 requires Indonesian students to master at least six basic literacies. One of them is literacy. This literacy is the initial literacy that must be mastered because it includes functional literacy that is useful in everyday life. This literacy is not only how a people is free from illiteracy, but also has the life skills to be able to compete globally. This year is the fifth year since the program was launched. Ideally, a change in literacy ability can be seen in students. National Examinations, especially Indonesian Language test, can be used as a benchmark for these achievements. This test requires students to be able to answer problems related to reading and writing (literature and non-literature). Remarkably, for three consecutive years, the results of the Indonesian Language National Examination, especially at the Junior High School level, were ranked highest compared to other subjects. In general, students' literacy reading ability is in the ability to access and retrieve information in simple texts (150 to 200 words). They are able to determine the main sentence / main idea of a paragraph, determine the main character, and determine the background evidence of place / time / situation in the text. This is comparable to the 2018 PISA study, that is, the literacy ability of Indonesian students reading is at the level of detecting and handling conflict and representing information literally in the form of uncomplicated questions. Unfortunately, there are some abilities that students have not mastered based on the results of the two tests. In this paper these matters are discussed more deeply with the aim of becoming an enrichment material for teachers in schools to further enhance students' literacy reading skills.
Penggunaan Bahasa Nonverbal dalam Upacara Adat Pernikahan Gaya Yogyakarta: Kajian Simbolik Etnopragmatik
Authors: Pranowo NFN , Frdaus Winci
Published: June 2020

This research is an interpretive reflective research with ethnopragmatic symbolic study theory. The source of the research data was taken from the documents of two makeup artists from Yogyakata, namely the makeup dresser Lisandra and the makeup dresser Hj. Rochayati. The research data are in the form of Javanese traditional wedding document of Yogyakarta style. The data collection technique is in the form of observation of photo documentation to obtain data in the form of a marriage ceremony sequence that uses verbal and nonverbal language from preparation to the end. The data analysis technique is interpretive reflective. The concrete steps of data analysis are (a) identifying documents, (b) classifying the sequences of marriages, and (c) interpreting each stage of the ceremony. The objectives of the research are (1) to describe the form of nonverbal language in traditional marriage ceremonies, and (2) to describe the non-verbal symbolic meaning of non-verbal language in marriage ceremonies. The findings of the research are that (a) the form of Yogyakarta-style traditional wedding events there are 15 stages, ranging from paningsetan to reception, and (b) ethnopragmatic symbolic meaning in general in the form of prayer requests so that what is desired can be realized.AbstrakPenelitian ini merupakan penelitian reflektif interpretatif dengan teori kajian simbolik etnopragmatik. Sumber data penelitian diambil dari dokumen dua orang juru rias dari Yogyakata, yaitu rias pengantin Lisandra dan rias penantin Hj. Rochayati (nama disamarkan). Data penelitian berupa dokumen foto perkawinan adat Jawa gaya Yogyakarta. Teknik pengumpulan data berupa observasi dokumentasi foto untuk mendapatkan data berupa urutan upacara perkawinan yang menggunakan bahasa verbal dan bahasa nonverbal dari persiapan sampai dengan akhir. Teknik analisis data dilakukan secara reflektif interpretatif. Langkah konkret analisis data adalah (a) mengidentifikasi dokumen, (b) mengklasifikasi urut-urutan acara perkawinan, dan (c) menginterpretasi tiap tahapan upacara. Tujuan penelitiannya adalah (1) mendeskripsikan wujud bahasa nonverbal dalam upacara adat perkawinan, dan (2) mendeskripsikan makna simbolik etnopragmatik bahasa nonverbal dalam upacara adat perkawinan. Temuan hasil penelitian adalah bahwa (a) wujud acara adat perkawinan gaya Yogyakarta terdapat 15 tahapan, mulai dari paningsetan sampai dengan resepsi, dan (b) makna simbolik etnopragmatik pada umumnya berupa doa permohonan agar apa yang diinginkan dapat terwujud.
CONHECIMENTO ESPECIALIZADO DE PROFESSORES DE QUÍMICA: MODELO TEÓRICO
Authors: Soares Susel Tais , Lima Stela Silva , Carbo Leandro
Published: June 2020

A proposta de modelos educacionais tem sido objeto de estudo nas últimas décadas; a área da Matemática tem recebido maior destaque em comparação com as demais, inclusive possui o modelo teórico denominado: Conhecimento Especializado de Professores de Matemática – MTSK. Este modelo possibilita a descrição do conjunto de conhecimentos matemáticos necessários para o ensino e a aprendizagem de determinado conteúdo matemático. Embora a Matemática tenha sido pioneira no modelo de Conhecimento Especializado de Professores e existam outros modelos genéricos para a área das ciências da natureza, somente em 2018 a física propôs um modelo teórico por meio da transposição do MTSK. Dessa forma, o objetivo desta pesquisa foi propor um modelo teórico para a área da química, por intermédio da transposição do MTSK, com intuito de diminuir a desconexão do conhecimento científico com o pedagógico, permitir que o docente possa aprimorar seus conhecimentos para ensinar química e, consequentemente, contribuir para os processos de ensino e aprendizagem. A pesquisa seguiu a mesma metodologia aplicada para a área da física, através da transposição do MTSK resultando no modelo Conhecimento Especializado de Professores de Química – CTSK. O resultado foi satisfatório, uma vez que atendeu aos objetivos propostos, resultando no CTSK, um modelo teórico com dois domínios, um referente ao Conhecimento Químico e outro ao Conhecimento Didático do Conteúdo; cada domínio possui três subdomínios, e; o modelo ainda considera as crenças provenientes, tanto dos professores quanto dos alunos.
Relationality or Hospitality in Twenty-First Century Research? Big Data, Internet of Things, and the Resilience of Coloniality on Africa
Authors: Nhemachena Artwell , Hlabangane Nokuthula , Kaundjua Maria B
Published: June 2020

In a supposedly relational world, African people are increasingly datafied, dehumanised and denied self-knowledge, self-mastery, self-organization and data sovereignty. They are datafied, dehumanised and recolonised by foreign corporations and states engaged in the new scramble for African data. Arguing for more attention to data sovereignty, this article notes that the relational Internet of Things and Big Data threaten the autonomy, privacy, data, and national sovereignty of Africans. Deemed, in relational ontologies, to be lacking autonomy and to be indistinct from machines/nonhumans/animals, Africans would then be inserted or implanted with remotely controlled intelligent tracking devices that mine data from their brains, bodies, homes, cities and so on. Because technological relationality effaces distinctions between nature and culture, it legitimised mining data from human minds/bodies as if the data were natural minerals.
MODEL OF VULNERABILITIES ANALYSIS OF SOCIO-TECHNICAL SYSTEMS TO THE SOCIAL ENGINEERING INFLUENCES
Authors: Mokhor Volodymyr , Tsurkan Oksana , Herasymov Rostyslav , Kruk Olha , Pokrovska Valeriia
Published: June 2020

Socio-technical systems as education with technical and social subsystems are considered. The directions for ensuring their safety have been established and among them the use of technical capabilities has been singled out, taking into account user behavior. Attention is paid to their vulnerabilities to the realisability of sociotechnical threats, in particular, the influence of social engineering. The orientation of such an influence on the manipulation of weaknesses, needs, mania (passions), user hobbies is shown. This leads to the insolvency of socio-technical systems to counteract the influence of social engineering. This can be prevented by analyzing the user's vulnerabilities regarding the forms of manipulation of their consciousness. The approaches to counteracting the use of social engineering are compared. For each of them, the application features, advantages, and disadvantages are analyzed. Given this, it is proposed to use fuzzy directed social graphs to set a model for analyzing the vulnerabilities of socio-technical systems. This was preceded by the definition of the concepts of the social network, actor, relationships. This view allows us to take into account the characteristics of the social engineering influence. In particular, the numbers of input and output arcs distinguish varieties of actors from the social engineer, user, manipulative form, vulnerability. While the importance of each of them is determined using the characteristics of centrality and prestige. At the same time, the levels of the actor, dyad, and the triad of vulnerabilities analysis of socio-technical systems to the effects of social engineering are highlighted. This will make it possible to determine the ways of such impacts taking into account the peculiarities of their realizability through user vulnerabilities and, as a result, to counteract them. In further research, it is planned to develop a method for analyzing the vulnerability of socio-technical systems to the impacts of social engineering based on the proposed model.
METHODS AND MODELS OF CONSTRUCTION OF INFORMATION TECHNOLOGIES OF REMOTE MEASUREMENT OF NANOBRATION
Authors: Hulak Hennadii , Otto George
Published: June 2020

Methods and models of systems for remote measurement and recording of vibrations with amplitude less than 10 nanometers are investigated on the basis of coherent laser sources. The mathematical model of the Doppler effect is analyzed. The basic characteristics of perspective measurement systems are determined. The modern tendencies of development of the direction of laser Doppler vibrometers and the scope of their application are revealed, as well as the expediency of further researches is substantiated.

Observations of vibrations of various objects, their registration and analysis in the natural and applied sciences are one of the main methods on which the study of natural objects and phenomena, diagnostics in medicine and technology, the solution of special problems in military and law enforcement activities, ensuring information security at the objects of information activity, etc. In many cases, due to the specificity of the investigated objects, direct access to them is not possible or approaching the measurement object is unsafe for the researcher. The above determines the relevance of research into the problems and principles of building reliable information technologies for remote measurement of vibration, ensuring their high guaranteeability, including information security, resolution. Of particular interest in practical applications are technologies capable of distinguishing vibrations with an amplitude of less than 10 nanometers (hereinafter referred to as nanovibrations).

Therefore, to select the essential parameters of designing a domestic product (laser vibrometer) and look for opportunities to increase the sensitivity of such products, the article elaborated and formed a set of qualitative and technical characteristics of existing devices for remote measurement of nanovibrations and provided comments on the solution of the sensitivity problem.
On the Privacy and Utility Properties of Triple Matrix-Masking
Authors: Ding Aidong Adam , Miao Guanhong , Wu Samuel Shangwu
Published: June 2020

Privacy protection is an important requirement in many statistical studies. A recently proposed data collection method, triple matrix-masking, retains exact summary statistics without exposing the raw data at any point in the process. In this paper, we provide theoretical formulation and proofs showing that a modified version of the procedure is strong collection obfuscating: no party in the data collection process is able to gain knowledge of the individual level data, even with some partially masked data information in addition to the publicly published data. This provides a theoretical foundation for the usage of such a procedure to collect masked data that allows exact statistical inference for linear models, while preserving a well-defined notion of privacy protection for each individual participant in the study. This paper fits into a line of work tackling the problem of how to create useful synthetic data without having a trustworthy data aggregator. We achieve this by splitting the trust between two parties, the ``"masking service provider" and the ``"data collector."
INSPECTRE: Privately Estimating the Unseen
Authors: Acharya Jayadev , Kamath Gautam , Sun Ziteng , Zhang Huanyu
Published: June 2020

We develop differentially private methods for estimating various distributional properties. Given a sample from a discrete distribution p, some functional f, and accuracy and privacy parameters alpha and epsilon, the goal is to estimate f(p) up to accuracy alpha, while maintaining epsilon-differential privacy of the sample. We prove almost-tight bounds on the sample size required for this problem for several functionals of interest, including support size, support coverage, and entropy. We show that the cost of privacy is negligible in a variety of settings, both theoretically and experimentally. Our methods are based on a sensitivity analysis of several state-of-the-art methods for estimating these properties with sublinear sample complexities
Synthesis and Structural Characterization of Y-doped Pyramidal ZnO Powders
Authors: KAYGİLİ Omer , KEBİROGLU Hanifi , BULUT Niyazi , OKUR Havva Esma , ERCAN İsmail , ERCAN Filiz , YAHIA İ.s. , ATES Tankut , KÖYTEPE Süleyman , SEÇKİN Turgay , INCE Turan
Published: June 2020

The present study focuses on the structural changes in ZnO powder induced by doping of a rare earth metal of Y. For this aim, we synthesized four ZnO samples with different Y-content using the combustion reaction method. X-ray powder diffraction (XRPD) technique and scanning electron microscopy (SEM) results confirm that the as-investigated structural parameters and morphology of the ZnO structure were affected directly by the concentration of Y dopant. For each Y-doped sample, randomly-oriented pyramidal morphology and the formation of a minority phase of Y2O3 were observed. A gradual increase in both lattice parameters and unit cell volume was detected with increasing Y content. All samples were found to be thermally stable in the temperature interval of 25-950 °C.
Morbilidad dermatológica en pacientes atendidos por la Patrulla Aérea Civil Colombiana, 2008-2018
Authors: Aguilar Medina Nicolás , Lucía Van Den Enden Medina Lucía , Jaramillo Ayerbe Felipe , Carvajal De los Ríos Eduardo
Published: June 2020

Introducción: la Patrulla Aérea Civil Colombiana es una organización privada sin ánimo de lucro, que durante aproximadamente 50 años ha brindado atención médica especializada, quirúrgica y de emergencia gratuita a personas en condiciones de pobreza y exclusión social o geográfica, por medio de brigadas mensuales en diferentes zonas rurales de Colombia. En sus archivos ha guardado información valiosa que es necesario conocer.
Materiales y métodos: se diseñó un estudio descriptivo, observacional, de corte transversal retrospectivo, que tiene como objetivo describir las características sociodemográficas, epidemiológicas y clínicas de los pacientes con patologías dermatológicas atendidos por la Patrulla Aérea Civil Colombiana durante los años 2008-2018.
Resultados: se realizaron 37 brigadas en 26 poblaciones de 14 departamentos de Colombia, donde se atendieron 2975 pacientes por dermatología, que tenían 3424 enfermedades. El 50% de la población de estudio tenía 31 años o más. El 69% eran mujeres y el 59,6% eran mestizos. El acné fue la enfermedad más común, seguido de la pitiriasis versicolor, nevo melanocítico adquirido y dermatitis seborreica. Se encontraron 6 casos de lepra y 2 de lobomicosis.
Discusión: hay correlación en la frecuencia de enfermedades en las ciudades y en la muestra rural de nuestro estudio; sin embargo, el prurito sine materia se encontró concentrado en el Pacífico colombiano en mujeres recolectoras de “piangua”. Casi el 50% de los carcinomas basocelulares encontrados se presentaron en dos poblaciones del Casanare.
Conclusiones: se recomiendan estudios para conocer la prevalencia de algunas infecciones tropicales en El Charco y La primavera. Se necesitan estudios de prevalencia de morbilidad dermatológica nacional con muestras poblacionales adecuadas.
Esclerodermia localizada: a propósito de un caso clínico
Authors: Imbett Sharon , Suárez Carolina , González Alfonso
Published: June 2020

Se presenta el caso de una paciente de 4 años, quien, desde el primer año de vida, presenta una mácula hipercrómica en la región malar derecha, acompañada de retracción de la piel; el diagnóstico fue de esclerodermia localizada o morfea. Además, se hace una breve revisión bibliográfica sobre la esclerodermia localizada y sus variantes, con el objetivo de contribuir al conocimiento desde los primeros niveles de atención, y favorecer un diagnóstico oportuno, que impacte positivamente en el manejo y el pronóstico de esta enfermedad.
Se puede concluir que la esclerodermia localizada, o morfea, es una entidad que afecta la calidad de vida de quien la padece, dado que no se limita a su diversidad de manifestaciones cutáneas, sino que, en algunas variantes, presenta compromiso extradérmico. El diagnóstico temprano permite establecer un tratamiento y un seguimiento adecuados, evitando el desarrollo de complicaciones.
Melanoma del conducto auditivo externo. Presentación de un caso
Authors: Rosales Torres Pedro , Pila Pérez Rafael , León Acosta Pedro , Pila Peláez Rafael , Saurith Monterrosa Jaider Luis
Published: June 2020

Los melanomas cutáneos son neoplasias malignas cuya incidencia ha aumentado marcadamente en las últimas cinco décadas. En cuanto a los melanomas cutáneos primarios, la localización en cabeza y cuello representa el 17%. De estos, entre el 7% y el 16% se asientan en el oído externo, de los cuales, aproximadamente el 60% ocurren en el hélix y el antihélix (1, 2). El compromiso del conducto auditivo externo rara vez es informado y cuando ocurre, tiene lugar en el meato.
Reportamos el caso de un paciente campesino con exposición a la luz solar de larga data. El paciente presentó una lesión de 1×1,5 cm, aproximadamente, de color pardo oscuro, en el conducto auditivo externo, con otalgia, otorrea con presencia de pus, sangre e hipoacusia y adenopatía preauricular y cervical. El diagnóstico se confirmó con punción por aspiración fina (PAFF) del tumor y, además, con el estudio de la pieza postoperatoria, que confirmó el resultado de la PAFF.
Objeción de conciencia Parte 2
Authors: Maya José María
Published: June 2020

Este caso, que, como los anteriores, es tomado de la realidad en la atención de pacientes, generó lo que denominamos un “dilema ético”. El médico especialista tratante consideró que, dado que había posibilidades de supervivencia, debía utilizar todo el arsenal terapéutico disponible para tratar de salvar la vida del paciente y aumentar su esperanza de vida, aunque no pudiera curarlo, y, por ende, las dos solicitudes (la de darle tiempo para pensar y tomar una decisión y la de administrarle solo tratamiento paliativo) le parecían la primera inconveniente por la pérdida de tiempo y la segunda inaceptable. Olvidó el colega que la relación médico-paciente no se concibe hoy por hoy de tipo paternalista, sino que es una relación entre dos seres humanos, uno con conocimiento y experiencia en el ejercicio de la medicina y otro con una necesidad de salud, pero consciente de su derecho y capacidad para tomar decisiones sobre su propia vida.