bluuebunny/crossref_metadata_2025 huggingface dataset:
Synthesis of Mesoporous Silica from Bottom Ash Waste for CH4 Adsorption
Authors: Laharto Pradena Bhesari Fitrah , Anggraini Aristin Putri Kusuma , Fauzany Umirul Solichah , Kurniawan Randy Yusuf , Endang Purwanti Setyaningsih
Published: July 2019

The aim of this research is to synthesize mesoporous silica directly from the bottom ash waste through the melting method using alkali at high temperatures. The resulting mesoporous silica will be used as CH4 gas adsorbent. The bottom ash waste was firstly separated by Fe and Ca using 37% HCl followed by melting at high temperatures and producing silica extract. The extract will be used as the basic material for making mesoporous silica which impregnation with PEG 4000. The resulting solids will then be characterized using XRD and BET. The result of mesoporous silica was then carried out by measuring CH4 gas adsorption capacity by gravimetric method with interval temperature of 30, 40, and 50 °C and pressure of 1, 3, and 5 atm.
Reversible Adsorption-Desorption of Zn (II) and Pb (II) in Aqueous Solution by Thermosensitive-Sulfobetaine Gel
Authors: Ningrum Eva Oktavia , Bagus Asep , Sakohara Shuji , Suprapto  , Humaidah Nurlaili
Published: July 2019

Copolymer gel contains zwitterionic betaine N,N-dimethyl(acrylamidopropyl) ammonium propane sulfonate (DMAAPS) and thermosensitive N-isopropylacrylamide (NIPAM). Later, they were employed as reversible Zn (II) and Pb (II) adsorption-desorption in aqueous solution. The effects of temperature, monomer, cross-linker concentration, and type of ions on the swelling degree, and the adsorption amount of Zn (II) and Pb (II) ions onto the gel were investigated. In addition, the adsorption-desorption reversibility of ions was also examined. The adsorption ability and swelling degree of the gel were significantly influenced by temperature, monomer, and cross-linker concentrations. The amount of ions adsorbed onto the gel was inversely proportional to its temperature at various monomer concentrations. The swelling degree of the gel with NIPAM to DMAAPS molar ratio of 9:1 and 8:2 decreased with the increase of the temperature. However, for the gel prepared with NIPAM to DMAAPS molar ratio of 7:3, the swelling degree increased significantly as the temperature increased. It was obtained that the swelling degree of the gel in Zn(NO3)2 solution was higher than the swelling degree of the gel in Pb(NO3)2 solution. In contrast, the amount of ions adsorbed onto the gel in Zn(NO3)2 solution was slightly lower than in Pb(NO3)2 solution. Copolymer gel prepared with NIPAM to DMAAPS molar ratio of 8:2 exhibited the highest adsorption ability and swelling degree in Zn(NO3)2 and Pb(NO3)2 solutions. In addition, the copolymer gel of NIPAM-co-DMAAPS showed the reversible adsorption-desorption ability toward ions up to three cycles.
Preliminary Study of Alginates Extracted from Brown Algae (Sargassum sp.) Available in Madura Island as Composite Based Hydrogel Materials
Authors: Rasyida Amaliya , Rizkha Pradipta Thalyta , Tri Wicaksono Sigit , Mitha Pratiwi Vania , Widya Rakhmawati Yeny
Published: July 2019

Utilization of brown algae especially in Madura, where it’s close to Surabaya, only limited for food. This become a reference for developing and increasing the potential of this algae by extracting one of the ingredients, namely alginate. This paper deals with the characterization of sodium alginate extracted from sargassum sp. using modified-purified calcium routes. The extracted sodium alginate will be further used as composite hydrogel materials and compared with commercial sodium alginate. Hereafter, the synthesized composite is expected to be bio-ink for 3d printer. Chemical composition analysis were analyzed using X-Ray Fluorosense (XRF) followed by Fourier-transform infrared spectroscopy (FTIR) analysis to identify the functional group of composite and X-Ray Diffraction (XRD). Furthermore, viscosity bath is performed to compare the viscosity of extracted and commercial one. The result shows that modified-purified calcium routes in the extraction process of sodium alginate is desirable for improving their properties. Interestingly enough, with the goal of using it as bio-ink in 3d printed fabrication, the synthesized composite shows viscosity, 300 cSt, which meets the criteria for bio-ink in 3d printer.
The Effect of Deposition Time on Ag-Zn Thin Film Forming Using RF Sputtering for Antimicrobial Coating Orthopedic Devices
Authors: Purniawan Agung , Hayati S.B. Widia Rezaly Biharu , Atmono Tri Mardji , Fajarin Rindang , Wicaksono Sigit Tri
Published: July 2019

Stainless steel 316L is one of material that commonly used as medical bone implants. The needs of bone implants is quite high, even increases each year. However, bone implants itself has risks associated with bacteria and fungi. Various microorganisms can act as pathogens that have the abilityto stick to the surface of the implant material and forms biofilms that initiating infection inside the body. The method that can be used to prevent the infection is surface modifcation by applying antimicrobial coating on the implant material surfaces. Scientifically, silver (Ag) and zinc (Zn) are materialsthat have good antibacterial and biocompatibility properties. In this study, AgZn was deposited on SS 316L substrate using Radio Frequency (RF) Sputtering method. The aims of this study are to analyze the effect of the deposition time (15 minutes till 45 minutes). The surface area ratio of target material is 80% Ag 20% Zn. The morphology, mechanical properties, and antimicrobial properties of the thin film were studied. The variations of deposition time cause the difference in AgZn thin film thickness deposited on the surface of the substrate. The thickest thin film was obtained at 45 minutes deposition time, which is 1.61 μm thickness. Deposition time can also increase surface roughness and antimicrobial ability due to agglomerization of Ag and Zn on the surface of the sample. The best antimicrobial ability is found at deposition time of 45 minutes, resulting 11,3 mm of inhibition zone width
Effect of Drug Loading Method on Drug Dissolution Mechanism of Amoxicillin Trihydrate Encapsulated in Chitosan-Poly(N-Vinylpyrrolidone) Full-IPN Hydrogel as a Floating Drug Delivery System Matrix
Authors: Baihaqi Ahmad Ichsan , Rahayu Dyah Utami Cahyaning , Budianto E.
Published: July 2019

Amoxicillin trihydrate suits to be encapsulated into a modified matrix to increase its bioavailability. In this study, the effect of drug loading methods on drug dissolution mechanism from chitosan-poly(N-vinylpyrrolidone) hydrogel with CaCO3 as the effervescent agent has been studied. It was found that the encapsulation efficiency of in situ and post loading methods were 93% and 75%, respectively. The dissolution values were 94% and 98%, respectively for in situ and post loading. The dissolution test data was incorporated into zero-order, first-order, Higuchi and Korsmeyer-Peppas models to evaluate the kinetic and the mechanism of the drug dissolutions. The in situ loading method fits well to first-order model (R2 = 0.9772), while the post loading method fits well to Higuchi model (R2 = 0.9880). Based on Korsmeyer-Peppas model, the dissolution mechanism of in situ loading was Fickian diffusion (n = 0.4024), while post loading was a combination of diffusion and erosion (n = 0.5532). From the SEM images, it showed that the surface and cross-sectional of the post loading method hydrogel formed pores and pore channels, both before and after the dissolution test. Meanwhile, on the surface and the cross-sectional of in situ loading method hydrogel had pores and pore channels only after dissolution test.
Preparation and Characterization of Carbon from Petung Bamboo (Dendrocalamus asper) and Ori Bamboo (Bambusa arundinacea) by Carbonization Heat Treatment
Authors: Ardhyananta Hosta , Puspita Evi Inaiyah , Wicaksono Sigit Tri , Pakaya Fahriadi , Wibisono Alvian Toto , Ismail Hanafi
Published: July 2019

Bamboo is an interesting renewable material. Bamboo was used as a source to produced carbon black. This study was using Petung Bamboo (Dendrocalamus asper) and Ori Bamboo (Bambusa arundinacea) as a source of carbon. Carbon black was formed from bamboo through carbonization heat treatment at low temperature in air atmosphere (without inert gas). Carbonization heat treatment was done through gradual heating. The achieved bamboo carbon black was examined. In air atmosphere, bamboo carbon black was formed through slow heating at 300 °C and burned at rapid heating. The yield of bamboo carbon from Petung Bamboo was higher than Ori Bamboo. X-ray diffraction (XRD) results showed amorphous structure of the carbon. Scanning Electron Microscopy (SEM) observation showed that bamboo carbon has fiber and cell structure containing pore. BET results showed that surface area increased with increasing carbonization temperature. Bamboo carbon has high calorie value. Thermogravimetric Analysis (TGA) results showed that degradation temperature increased with increasing carbonization temperature.
The Explosion Severity of Biogas(CH4-CO2)/Air Mixtures in a Closed Vessel
Authors: Khan Nur Aqidah Muhammad Harinder , Sulaiman Siti Zubaidah , Izhab Izirwan , Mudalip Siti Kholijah Abdul , Che Man Rohaida , Md Shaarani Shalyda , Mohd Arshad Zatul Iffah , Kasmani Rafiziana Md , Sulaiman Sarina
Published: July 2019

Biogas which consists of methane (CH4) and carbon dioxide (CO2) could explode when diluted to a certain degree with air in the presence of ignition source. The maximum explosion overpressure (Pmax), the maximum rate of pressure rise (dP/dt)max, flammability limits, and deflagration index are the most important explosion severities parameters to characterize the risk of explosion. In this research paper, the effect of equivalence ratio (ER) of biogas/air mixtures and the effect of CO2 concentrations presence in biogas were studied in a 20 L spherical vessel. The values of Pmax and (dP/dt)max of biogas/air mixtures were more severe at ER 1.2. At various CO2 content, Pmax and (dP/dt)max of biogas/air mixtures were the least affected at 45% vol/vol of CO2. On the other hand, deflagration index (KG) of biogas/air mixtures trend was the most severe at 35% vol/vol of CO2 content despite the lowest Pmax and (dP/dt)max at 45% vol/vol of CO2 content. The lowest values in Pmax and (dP/dt)max were due to the diffusivity properties of CH4 that had surpassed the CO2 suppression effect. Furthermore, the presence of CO2 in biogas/air mixtures had increased the upper flammability limit and lower flammability limit of biogas.
Examination of Natural and Standard Fe3O4 Powders Using X-Ray Absorption Near-Edge Spectroscopy (XANES)
Authors: Budi Hariyanto , Husain Husain , Supanun Lapboonruang , Suminar Pratapa
Published: July 2019

Investigation of Fe K-edge X-Ray Absorption Near Edge Spectroscopy (XANES) spectra of Fe3O4 (FeO.Fe2O3) from natural source compared with the Fe3O4 standard is presented. The natural Fe3O4 powder was prepared from ironstone of Tanah Laut, Kalimantan Selatan by co-precipitation method. XANES measurements in transmission mode were performed at the Synchrotron Light Research Institute (SLRI), Nakhon Ratchasima, Thailand. XRD phase analysis confirms that the synthesized Fe3O4 powder is a single phase, but it cannot determine the proportion of Fe2O3 and FeO in the structure. TEM measurement confirms that the particle size of natural Fe3O4 about 10 nm. Qualitative analysis of the pre-edge XANES data revealed that the absorbing atom in the XAS measurement is Fe3+. Meanwhile, the absorption edge (E0) values of natural and standard Fe3O4 powders were 7126.44 eV and 7125.02 eV, respectively. The proportion was then acquired using XANES data analysis through Linear Combination Fitting (LCF). It was found that the natural Fe3O4 sample consisted of 98 wt. % Fe2O3 and 2 wt.% FeO, while the standard Fe3O4 powder consisted of 96 wt. % Fe2O3 and 4 wt. % FeO. The mechanism of the absorption in both samples is also described and compared.
The Study of Additive Variation in Smelting Process of Sponge Iron into Pig Iron on the Fe Content and Fe Recovery Using Electric Arc Furnace
Authors: Pintowantoro Sungging , Abdul Fakhreza , Prasetyo Imam , Dharma Angga
Published: July 2019

Iron sand as the largest form of iron ore reserves in Indonesia has not been optimized properly for domestic iron-steel production. In the production chain of pig iron from iron sand, there is a problem that in sponge iron (result of direct reduction) contains many impurities, especially titanium. This research is conducted to determine the effect of additive variation to the Fe content and Fe recovery during sponge iron smelting process into pig iron using electric arc furnace (EAF). Types of additives variation that used in this research are CaCl2 and CaC2, as well as smelting without additive as comparison. Briquettes made from sponge iron, coal, flux (SiO2), and variations of additive are melted in crucible using EAF (16.2 Volt; 180 Ampere) for 6 minutes. Based on EDX and XRD results of pig iron and slag, the optimum process of sponge iron smelting is use the CaCl2 as additive. It’s shown by the result that the pig iron containing the highest %wt Fe by 90.97% and the highest Fe recovery by 80.41%. The product that used CaC2 as additive has Fe content of 89.31 %wt and Fe recovery during process of 72.36%. Meanwhile, the results obtained from the smelting without additives only shows that the Fe content in pig iron amounted to 88.90 %wt and 68.76% values for Fe Recovery.
Investigations on Impact Toughness and Microstructure Characteristics of Gas Metal Arc Welded HY-80 Steel Plate
Authors: Oktadinata Herry , Winarto Winarto , Siradj Eddy S.
Published: July 2019

HY-80 is the high yield steel that commonly used for naval ship and submarine. Arc welding operations are critical stage in fabrication of this steel. During welding, the problem may occur in the heat affected zone due to the high temperature makes the microstructure suddenly changes. Coarse grain heat affected zone (CGHAZ) develops close to the fusion line, steel become brittle and the impact toughness decrease. This research investigated the microstructure of HY-80 weldment, impact toughness at sub-zero temperatures, and hardness distribution along cross-section of the welded joint. ER100S welding wire, Ar+10%CO2 shielding gas mixture and single V-groove butt joint with an angle of 60° were selected prior to welding. 12 mm thick of HY-80 steel plate that used in this experiment was multipass welded by gas metal arc welding (GMAW). Impact toughness at sub-zero temperature, hardness and microstructure evolutions of base metal (BM), heat affected zone (HAZ) and weld metal (WM) were observed. The result shows at a temperature of-80 °C, the lowest impact toughness was measured at WM (61 J) as compared to fusion line (101 J) and BM (217 J). The hardness measurement shows the maximum hardness was measured in CGHAZ followed WM and BM. Vickers hardness test result of weld joint at bottom area are higher than top area. It may caused of the low heat input of back weld compared to other passes. The lower heat input, cooling rate increased and initiate the formation of hard phase. The microstructure of WM shows acicular ferrites and non-metallic inclusions, these inclusions may deteriorate the impact toughness.
Enhanced Biodiesel and Ethyl Levulinate Production from Rice Bran through Non Catalytic In Situ Transesterification under Subcritical Water Ethanol Mixture
Authors: Zullaikah Siti , Utami Sri , Herminanto Rifky Putra , Rachimoellah M.
Published: July 2019

In-situ transesterification method without catalysts to produce biodiesel (fatty acid ethyl esters, FAEE) from rice bran using subcritical water ethanol mixture has been investigated. This method was found to be efficient since the rice bran oil (RBO) extraction and reaction of RBO into FAEE occur simultaneously. In this process other chemical (ethyl levulinate, EL) was also formed along with FAEE. EL can be used to improve the biodiesel quality by improving the low temperature properties of biodiesel. In this study effect of co-solvent types (without co-solvent, ethyl acetate, chloroform, and n-hexane) and water ethanol ratio (20%, 40%, 50%, 60% and 80%, v/v) on the content and yield of FAEE and EL at subcritical water ethanol mixture (T= 160°C, P= 80 bar, and t= 2 h) were investigated systematically. The content and yield of FAEE and EL obtained was found to be affected by the type of co-solvent. The content of FAEE and EL obtained without co-solvent (ethanol and water polarity index were PI=5.2 and PI=10.2, respectively) and with co-solvent of ethyl acetate (PI= 4.4), chloroform (PI= 4.1) and n-hexane (PI= 0.1) were 55.80% and 3.92%, 68.63% and 1.15%, 65.56% and 2.14%, and 62.00% and 0.93%, respectively. Higher polarity index of co-solvent extracted more RBO, as consequent the yield of FAEE (79.79%) obtained was higher using ethyl acetate as co-solvent. This data also suggested that RBO contains more free fatty acids (FFA= 63.59%) rather than of triglycerides (TG= 24.94%).The content and yield of FAEE and EL decreased with increasing water ethanol ratio. The highest content of FAEE (60.57%) and EL (8.48%) and yield of FAEE (78.03%) and EL (10.92%) were obtained using water ethanol ratio of 20%, v/v.
Casein haplotype diversity in seven dairy goat breeds
Authors: Criscione Andrea , Tumino Serena , Avondo Marcella , Marletta Donata , Bordonaro Salvatore
Published: July 2019

Abstract. Selection, drift, gene flow and breeding have extensively shaped the genomic variability of domestic animals. In goat species, several mutations identified within the casein genes have been shown to affect the level of gene expression of milk production traits. The four casein genes – CSN1S1, CSN2, CSN1S2 and CSN3 – are organized in a cluster of 250 kb located in chromosome 6, and due to tight linkage, their genetic variability is well depicted by haplotypes which are transmitted to the progeny. Thirty single nucleotide polymorphisms (SNPs) located within the casein gene cluster were used to characterize the haplotype variability of six southern Italian goat breeds (Girgentana, Maltese, Rossa Mediterranea, Argentata dell'Etna, Messinese, Capra dell'Aspromonte). A representative sample of the Norwegian dairy goat breed (Norsk melkegeit) has been used as an out-group to obtain a weighted measure of genetic diversity in the metapopulation. A total of 54 haplotypes were detected among the seven breeds: 26, 9, 8 and 11 haplotypes were found at CSN1S1, CSN2, CSN1S2 and CSN3 respectively. The number of haplotypes per breed was 14 (Norwegian), 26 (Messinese), 27 (Rossa Mediterranea and Girgentana) and 31 (Maltese, Argentata dell'Etna and Capra dell'Aspromonte). The Maltese breed showed the highest number of private haplotypes, whereas the Norwegian goat recorded the highest number of shared haplotypes. The linkage disequilibrium analysis showed higher levels of association for the SNP pairs within casein loci than SNP pairs between casein loci, likely reflecting low levels of intra-genic recombination. The highest linkage disequilibrium values were found in CSN1S1 and CSN2 genes in all the breeds, except for Argentata dell'Etna and Rossa Mediterranea. The resolution of the haplotype diversity at the casein cluster can be exploited both for selective and conservative plans.
High-resolution Beijing mesosphere–stratosphere–troposphere (MST) radar detection of tropopause structure and variability over Xianghe (39.75° N, 116.96° E), China
Authors: Chen Feilong , Chen Gang , Tian Yufang , Zhang Shaodong , Huang Kaiming , Wu Chen , Zhang Weifan
Published: July 2019

Abstract. As a result of partial specular reflection from the atmospheric stable
layer, the radar tropopause (RT) can simply and directly be detected by VHF
radars with vertical incidence. Here, the Beijing mesosphere–stratosphere–troposphere (MST) radar measurements are
used to investigate the structure and the variabilities in the tropopause in
Xianghe, China, with a temporal resolution of 0.5 h from November 2011 to
May 2017. The high-resolution radar-derived tropopause is compared with the
thermal lapse-rate tropopause (LRT) that is defined by the World Meteorological
Organization (WMO) criterion from twice-daily radiosonde soundings and with
the dynamical potential vorticity tropopause (PVT) that is defined as the
height of the 2 PVU (PVU – potential vorticity units; 1 PVU = 106 m2 s−1 K kg−1) surface. We only consider tropopauses below 16 km in this
study because of limitations with the radar system. During all the seasons,
the RT and the LRT in altitude agree well with each other, with a correlation
coefficient of ≥0.74. Statistically, weaker (higher)
tropopause sharpness seems to contribute to larger (smaller) difference
between the RT and the LRT in altitude. The RT agrees well with the PVT in
altitude during winter and spring, with a correlation coefficient of
≥0.72, while the correlation coefficient in summer is only
0.33. As expected, the monthly mean RT and LRT height both show seasonal
variations. Lomb–Scargle periodograms show that the tropopause exhibits
obvious diurnal variation throughout the seasons, whereas the semidiurnal
oscillations are rare and are occasionally observed during summer and later
spring. Our study shows the potential of the Beijing MST radar to determine
the tropopause height as well as present its diurnal oscillations.
El guardián Modesto González y la historiografía de la arqueología mexicana
Authors: Holley-Kline Sam
Published: July 2019

La historiografía de la arqueología mexicana suele enfocarse en los hallazgos y las interpretaciones de los arqueólogos conocidos; tal ha sido el caso de la zona arqueológica El Tajín, Veracruz. Investigaciones recientes en la historia de arqueología han analizado los contextos sociohistóricos de la disciplina, incluso los papeles de los trabajadores. Este artículo, empleando las herramientas teóricas de Michel-Rolph Trouillot, analiza la vida y obra del guardián Modesto González (c. 1890-1971), uno de los primeros empleados federales que trabajo en la zona arqueológica El Tajín. De acuerdo con investigación archivística y etnográfica llevado a cabo en 2016-2017, se elabora una narrativa sobre la vida de González, su labor como guardián de El Tajín, sus aportaciones a la antropología mexicana y sus creencias sobre la zona arqueológica. A partir de ahí, se explora el por qué del silencio de la historiografía de El Tajín sobre Modesto González, como manera de reflexionar sobre los silencios en la historiografía de la arqueología mexicana. Se concluye con propuestas para avanzar en el análisis de los trabajadores en la historiografía de la arqueología.
Dientes de hoz, hoces y Edad del Bronce: la contribución de un programa experimental de siega
Authors: Jover Maestre Francisco Javier , Rodríguez Rodríguez Amelia , Torregrosa Giménez Palmira
Published: July 2019

Aunque los denominados como dientes de hoz son bien conocidos en todos sus aspectos morfológicos, tecnológicos y funcionales, se consideró necesario el desarrollo de un nuevo programa de arqueología experimental con el objetivo de validar algunas de las hipótesis hasta ahora planteadas en la bibliografía específica y profundizar en el estudio de las variables que condicionan la formación de los desgastes por uso en dichas piezas. Los resultados traceológicos obtenidos del programa experimental y de un variado conjunto de dientes de hoz procedentes de distintos asentamientos arqueológicos del este de la península Ibérica han sido comparados. Entre otras conclusiones se puede señalar que los dientes de hoz fueron usados, preferentemente, como armaduras de hoces en labores de siega. La vida útil de los dientes de hoz en labores de siega es muy amplia, alcanzado varias jornadas de trabajo y, además, no fueron empleados como los trillos actuales, insertados en grandes tablas de madera.
Las comunidades medievales de villa y tierra: ¿una analogía válida para la Protohistoria Final?
Authors: Fernández-Götz Manuel , Liceras-Garrido Raquel
Published: July 2019

Los mecanismos sociales que articularon las sociedades de la Edad del Hierro siguen siendo difíciles de comprender. En las últimas décadas, los modelos piramidales tradicionales han sido cuestionados por varios autores que abogan por la diversidad de las sociedades de la Edad del Hierro y la heterogeneidad de formas potenciales de configuración social. Crucial para la mayoría de los debates es el uso de analogías, con algunos autores que favorecen las fuentes históricas de la Europa medieval, mientras que otros privilegian ejemplos etnográficos de áreas alejadas del continente europeo. Si bien consideramos que ambos enfoques son legítimos, en este trabajo presentamos el ejemplo de las comunidades de “villa y tierra” medievales, particularmente el caso de Soria. Estas comunidades muestran un modelo de relaciones de parentesco, basado en estructuras organizativas transversales, que pueden ayudarnos a comprender los lazos y vínculos entre los habitantes de un paisaje según sus orígenes, lugar de residencia o familia. Por ello, argumentamos que la comunidad de villa y tierra de Soria podría servir como una analogía útil, aunque no una comparación directa, para conceptualizar las interrelaciones entre las áreas urbanas y rurales, así como para examinar la estructuración simultánea de grupos sociales en torno a los principios de parentesco y territorialidad en un contexto de urbanización emergente.
Emilio Gamo Pazos, La romanización de Celtíberos y Carpetanos en la meseta oriental (Zona Arqueológica, n.º 22), Ediciones del Museo Arqueológico Regional de la Comunidad de Madrid, Alcalá de Henares, 2018. ISBN: 978-84-451-3628-3; 374 páginas
Authors: Abascal Palazón Juan Manuel
Published: July 2019

Emilio Gamo Pazos, "La romanización de Celtíberos y Carpetanos en la meseta oriental (Zona Arqueológica, n.º 22)", Ediciones del Museo Arqueológico Regional de la Comunidad de Madrid, Alcalá de Henares, 2018. ISBN: 978-84-451-3628-3; 374 páginas.
José Luis Escacena Carrasco y Luis Gethsemaní Pérez Aguilar (coordinadores). Todos en el beagle. Darwinismo y ciencias históricas. Sevilla, Editorial de la Universidad de Sevilla, 2018 (Colección de Divulgación Científica 19), 204 páginas, ISBN 978-84-472
Authors: Salas Álvarez Jesús
Published: July 2019

José Luis Escacena Carrasco y Luis Gethsemaní Pérez Aguilar (coordinadores). "Todos en el beagle. Darwinismo y ciencias históricas". Sevilla, Editorial de la Universidad de Sevilla, 2018 (Colección de Divulgación Científica 19), 204 páginas, ISBN 978-84-472-1930-8
Factors Affecting Tourism Marketing Demand: Evidence from Ethiopia Wildlife Conservation Authority and Bale Mountain National Parko in Ethiopia
Authors: Bekele Demie Addisu
Published: July 2019

The study was conducted to assess the Factors Affecting Tourism Marketing Demand in the case of Bale Mountain National Park. The main objective of the study is investigating factors affecting tourism marketing demand: the case of Bale mountain national park. The sample respondents were selected using Convenience sampling technique from non probability sampling. For the sake of achieving the objectives of this study, administered schedule were analyzed using statistical analysis both descriptive and inferential analysis. The information gathered through schedule from a sample of 220 tourists (domestic and international) and structured interviews were conducted with 8 workers of the park and analyzed using descriptive narrations. Regression and correlation analyses are also applied for the study. The findings indicate that poor image creation, lack of proper promotion of tourist attraction, inadequate infrastructure to and inside the destination, problem of safety and security, political risk, and seasonality nature of tourism demand are factors influencing tourism marketing demand. Based on findings, improving tourism infrastructure, Building institutional capacity and developing community based ecotourism are some of the recommendation forwarded.
Developmental Dysplasia of the Hip in Adolescents and Young Adults
Authors: Schmitz Matthew R. , Murtha Andrew S. ,   The ANCHOR Study Group, Clohisy John C.
Published: July 2019

Developmental dysplasia of the hip (DDH) in adolescents and young adults can cause notable pain and dysfunction and is a leading cause of progressive hip osteoarthritis in affected patients. Recognition of the clinical symptoms and radiographic presentation of DDH in adolescents and young adults are paramount for early management. Plain radiographs are critical for making proper diagnosis, whereas three-dimensional imaging including MRI and/or CT detects intra-articular pathology and better characterizes hip morphology. Management of early, symptomatic DDH includes nonsurgical modalities and open joint preservation techniques. Arthroscopic management can be used as an adjunct for symptomatic treatment and for addressing intra-articular pathology, but it alone does not correct the underlying osseous dysplasia and associated instability. The periacetabular osteotomy has become the mainstay of efforts to redirect the acetabulum and preserve the articular integrity of the hip; however, the proximal femur is also a potential source of pathology that should be considered. Open hip procedures are technically demanding yet provide the opportunity for pain relief, improved function, and preservation of the hip joint.
Recent trends in studies on polymer — dispersed liquid crystal composites
Authors: Kłosowicz Stanisław J.
Published: July 2019

The paper presents a review of results of studies in the field of PDLC material science and physics obtained during last few years and shows the main fields of interest in that subject. It covers an application of new polymers and liquid crystalline materials used to prepare those composites, modification of their properties by different inorganic and organic dopants as well as new optical properties. The evolution of scientific interest regarding PDLC composites in recent years is shown.
Keywords: material science, composites, polymer-dispersed liquid crystals, optics, electrooptics.
Adaptive method of similarity detection of user profiles on online social networks
Authors: Zabielski Michał , Tarapata Zbigniew , Kasprzyk Rafał
Published: July 2019

The paper presents a method, based on graph and network theory, which allows to detect cloned user profiles on Online Social Networks. Moreover, an idea of similarity containers, which gives an opportunity to incorporate importance and context of data into a model, was introduced. The presented solutions were adapted to the idea of simulation environment, which will allow to detect a profile cloning process before that activity will be completely performed by an attacker.
Keywords: Online Social Networks, user profile cloning, violation of privacy on the web.
Evaluation of tribological properties of lubricants based on Hersey’s–Stribeck’s characteristics
Authors: Aranowski Arkadiusz , Kałdoński Tadeusz , Gocman Krzysztof , Kałdoński Tomasz Jan
Published: July 2019

The content of the paper presents the results of investigations of selected lubricants. The study led to obtaining Hersey’s-Stribeck’s curves and to comparison of the lubricating properties of lubricants belonging to different groups such as hydrocarbon oils, perfluoropolyether oils (PFPE), and ionic liquids. The following liquids were evaluated for tribological properties: PAO-6 polyalphaolefin oil base, CJ 006 ionic liquid (3-methyl-1-propylpyridinium bis(trifluoromethylsulphonyl)-imide) and Fomblin Y 04 synthetic perfluoropolyether oil. The research was carried out using the universal nano/micro tribotester (UNMT-CETR, CA, USA) at the Department of Tribology, Surface Engineering and Service Fluids Logistics, Faculty of Mechanical Engineering, Military University of Technology. The study consisted of friction of a ball bearing steel (100 Cr 6) with a round specimen of a certain roughness (ball-on-disc). Friction occurred in rotational motion of the specimen, at different rotational speeds at constant radius and at constant load (0.25 N; 5 N; 50 N). The friction node was lubricated with the tested liquid.
Keywords: tribology, friction factor, Hersey’s−Stribeck’s characteristics.
MANAGING THE COLLECTIONS OF THE
MEDICAL UNIVERSITY OF WARSAW VERSUS
THE EXPERIENCE OF THE HUMBOLDT
UNIVERSITY AND THE UNIVERSITY OF VIENNA
Authors: Tyszkiewicz Adam
Published: July 2019

The Medical History Museum founded in
2011 within the structure of the Medical University of
Warsaw (WUM), following the solutions introduced at the
Humboldt University in Berlin and the University of Vienna,
is planning to shortly introduce coordination of protection
and display of the historic tangible heritage of the school.
In both Berlin and Vienna in the early 21st century the
project of university collection inventory was launched. Just over several years it yielded a large-scale digitizing
process, foundation of theme websites, publications,
and organization of temporary exhibitions promoting the
historic university collections. The Association of University
Museums established in Poland in 2014 has for several
years been drawing inspiration from the German and
Austrian models.
The WUM Medical History Museum, resorting to the
experience of the Berlin and Vienna universities, has
applied numerous ideas for the integration of the historic
collections, their identification, and recreation. Following
the history of medical collections in Warsaw from the 1st
half of the 19th century up to contemporary times, the
Author analyses the model for this museum strategy, while
also presenting examples of dangers resulting from the
mismanagement of university historic heritage.
In Zukunft ohne Text oder ohne Text keine Zukunft? Eine Evaluation der Reform des Telemedienauftrags aus Nutzer*innenperspektive
Authors: Schneiders Pascal
Published: July 2019

Am 1. Mai 2019 ist der 22. Rundfunkänderungsstaatsvertrag in Kraft getreten. Eine wesentliche Neuerung bildet die Neufassung von § 11d RÄStV. Dieser verbietet es öffentlich-rechtlichen Telemedienangebote künftig grundsätzlich, „presseähnlich“ zu sein, also nach Gestaltung und Inhalt Zeitungen oder Zeitschriften zu entsprechen. Bei den Verhandlungen zwischen Öffentlich-Rechtlichen und Verlagen spielte die Perspektive der Nutzer*innen, deren Akzeptanz die Basis für die Legitimität des öffentlich-rechtlichen (Online)-Angebots bildet, gegenüber ökonomischen Motiven offenbar eine untergeordnete Rolle. Dieser Beitrag nimmt die jüngste Einigung daher zum Anlass, 1.) Nutzer*innenpräferenzen, Nutzer*innenverhalten und Informationsverarbeitung im Kontext von Online-Nachrichtenangeboten gegenüberzustellen, um anschließend 2.) medienrechtliche Spielräume des Rundfunkstaatsvertrags zu analysieren und 3.) das hinter dem Verbot der Presseähnlichkeit stehende Kalkül der Etablierung von Zahlungsbereitschaften zu erörtern. Daraufhin werden 4.) darauf basierend konkrete Handlungsempfehlungen für eine stabile Koexistenz von Verlagen und Öffentlich-Rechtlichen abgeleitet. Zuletzt werden Schwierigkeiten und Alternativen medienrechtlicher Grenzziehungen (auch vor dem Hintergrund des geplanten Medienstaatsvertrags) diskutiert.
Lateral differences in maximal grip strength in Czech male tennis players aged 11 – 12 in the context of injury prevention
Authors: Kolínský Roman , Zháněl Jiří
Published: July 2019

The term laterality indicates the one-sided preference or functional advantage of the stronger, more accurate and coordinated limbs or organs and the brain hemisphere of a human body. In the preference process, more accurate, precise, coordinated and stronger side is chosen from the perspective of motoric functions. Among the general population is about 10-13% of left-handers and in certain sport fields this percentage may (baseball, tennis, box etc.). The left-handed dominance in tennis is considered an advantage. Due to unilateral load, there may be an excessive side-effect in strength differences in tennis and overloading of specific muscle group could lead to an injury. The aim of the research was to identify the levels of somatic and strength characteristics and assess the lateral difference in maximal grip strength of Czech elite male tennis players. The sample consisted of male tennis players, ranging in age from 11 to 12.9 years (n=186) who participated in the regular tests for Czech Tennis Association in years 2000-2018. Base anthropometrics were measured (height, weight) and maximal grip strength of both hands using the hand-held dynamometry (Grip D, Takei). Data came from normal distribution (statistically proven – chi-square test). The basic statistical characteristics were calculated (body height, M=155.08±7.98 cm; body weight, M=43.45±7.13 kg; strength of right hand: M=24.88±4.67 kp; strength of left hand: M=21.70±4.74 kp). It was found that 87.6% of the players (n=163) were right-handed and the remaining 12.4% left-handed (n=23). The assessment of the significance (Cohen´s d) between the dominant (playing) hand for the right-handed and left-handed players showed small effect size (dominant hand right: MRHR=25.11±4.41 kp, dominant hand left: MLHL=26.62±5.65 kp; d=0.30, small) in favor of the left-handed players. The difference between the dominant and the non-dominant hand showed large effect size for the right-handed (dominant hand right vs. hand left; MRHR=25.11±4.41 kp, MRHL=21.01±4.15 kp, d=0.96, large) and medium effect size for the left-handed players (dominant hand left vs. hand right; MLHL=26.62±5.65 kp, MLHR=23.24±5.98 kp, d=0.58, medium). The results showed that the value of 15 % level of strength laterality between dominant and non-dominant hand was exceeded for the right-handed (55.83 %) and left-handed (43.48%) groups ergo the exceeded value could be a cause of injuries. Because of this signals attention should be given during training process for optimizing the required load.
The effect of the intervention dance program on the level of functional fitness and postural stability in elderly
Authors: Vaculíková Pavlína , Skotáková Alena , Kropáčová Sylvie , Grmela Roman
Published: July 2019

Objective: The major objective of this study was to investigate the influence of six months dance intervention program on the level of functional fitness and postural stability in the elderly.Methods: The exercise program was carried out three times a week and included 60 dance exercise sessions. 60 elderly participated in the study (67.5±5.69 years), 30 in a dance intervention group (weight: 70.32±13.59kg; BMI 25.95±3.79 kg/m2), 30 in a control group (weight: 76. 93±15.45kg; BMI 27.06±3.88 kg/m2). Three subtests were used to determine the level of functional fitness from the Senior fitness test battery; the static posturography method assessed the level of balance abilities in one position.Results: The most meaningful results to emerge from the data are that the intervention dance program led to a post-exercise increase in the level of agility, dynamic balance and reaction speed measured by 8 Foot up Go test in the dance group. The results indicate a statistically significant difference value in the dance group compared to the control group between post-test results (p=0.01). Values of the other monitored parameters were not statistically significant. The Cohen coefficient d reflects the low or medium value of the intervention program's effectiveness.Conclusions: Even if the dance intervention program did not have a more significant effect on the level of the tested parameters, we must state that only a slight improvement or a steady level of functional fitness and postural stability is a positive result in this age. Keywords: aging, dance, Senior fitness test, motor abilities, balance ability
“Olympism“ and Olympic Education in Greek Antiquity
Authors: Kouřil Jiří
Published: July 2019

This paper deals with basic points which comprise Olympic and “sport“ education in the Greek antiquity. Until the emergence of professionalism in ancient athletics was the essence of "sport" education and Olympism the areas known as free “sport“, nudity, construction of “sports“ buildings, organizing of many games and relation of society to the Olympic winners as well as leading the citizens to cultural and philosophical ideals. The education itself to the Olympic Games and “sport“ had an important role in ancient Greece. Victory in the Panhellenic Games was very important not only for the victors as individuals, but also for their lineage and the city-state. Each victor entered the next level, which was close to the heroes and gods. They acquired semi-divine status and the homages for them by all society and mainly by the city-states were greatly important for cultural outputs and conception of all society. The influence of victors on youth was huge and this influence was one of the most important educational parts of all ancient Greek culture. The winners of great Panhellenic Games, especially the winners of the Olympic Games or περιοδονῑκοι (periodonikoi), were the best role models with big cultural power and the best examples for youth. Successes of ancient athletes supported sport education of young Greek boys, thus also the military training and this conception created better warriors and defenders of the city-states.
O Ensino de Filosofia nos meandros do Ensino Médio Estadual
Authors: Veiverberg Fernanda De Oliveira
Published: July 2019

A reflexão acerca do ensino de filosofia envolve diferentes questões. No âmbito da educação pública é necessário compreender os meandros que envolvem as práticas escolares, pautadas nos princípios da gestão democrática, e de como as orientações governamentais são compreendidas e executadas dentro da realidade de cada escola. Assim, ensinar filosofia para jovens de Ensino Médio não é algo que deriva, somente, dos anseios dos professores responsáveis pela disciplina, exige uma compreensão crítica da formação que se almeja, do campo de possibilidades que cada instituição de ensino oferece e a prática do diálogo constante, pois se tratando do ambiente escolar pouco se cria e se desenvolve isoladamente ou individualmente. Para isso, os pressupostos da formação humana integral e de práticas pedagógicas interdisciplinares parecem corresponder com a função da filosofia no Ensino Médio em um contexto de reestruturação de currículo, mas também de paradigmas.
Ensinar Ética é também ensinar a argumentar: análise de cinco falhas comuns de justificação ética
Authors: Oliveira Cínthia Roso , Doro Marcelo José
Published: July 2019

O ensino de filosofia no Ensino Fundamental e Médio constitui um desafio para o professor comprometido com o desenvolvimento da capacidade reflexiva e crítica dos alunos. Parte desse desafio é o ensino da Ética, que, com muita facilidade, pode virar doutrinação ou ficar numa mera discussão das opiniões, caso o professor não esteja atento aos argumentos dos estudantes para problematizá-los e aprofundá-los adequadamente. As aulas de Ética, para que desenvolvam a capacidade de fazer juízos éticos sensatos, devem se fundamentar no uso de bons argumentos; para tanto, cabe ao professor saber identificar as falácias, comumente usadas pelos estudantes na justificação dos comportamentos que acham corretos, e mostrar suas fraquezas. Dessa forma, o presente artigo pretende analisar cinco falhas frequentes de justificação ética, a saber: petição de princípio, apelo à maioria ou apelo ao povo, dois erros fazem um acerto, apelo à tradição e falácia naturalista. A discussão dessas falácias, frequentemente usadas para justificar comportamentos éticos, pretende auxiliar professores e futuros professores de Filosofia a problematizar as opiniões e pretensas justificações dos estudantes nas aulas de Ética, para que de fato as aulas de Filosofia como um todo desenvolvam o raciocínio crítico e a criatividade de seus participantes.
Notas sobre Filosofia, Educação e Ensinabilidade: uma crítica teórica de conceitos deleuziano e kantiano pela ótica epistêmica de Silvio Gallo
Authors: Santos Yvisson Gomes dos
Published: July 2019

Pretende-se, neste artigo, propor uma discussão teórica sobre o tutelamento kantiano com a criação de conceitos deleuzianos através do olhar de Silvio Gallo (2000; 2008). Sabe-se que para se chegar a uma maioridade intelectual é necessário se libertar do tutelamento que a sociedade ocidental nos colocou. Nesse sentido, Kant (2009; 1974) nos dar pistas teoréticas para o desfecho deste tutelamento, a saber, a utilização da razão. Enquanto isto, Deleuze e Guattari (1992; 2011) afirmam que para ser um filósofo necessita-se criar conceitos. Nessas duas perspectivas teóricas, Silvio Gallo faz-nos pensar sobre a ensinabilidade da Filosofia através da razão e das problematizações. Por meio da acepção teórica do educador e filósofo paulista, as idiossincrasias teóricas de Kant e Deleuze nos deram pistas para indicar um ensino de filosofia que se articulará através das problematizações e da criticidade em seu fazer/saber educativos.
O sentido e o lugar do texto filosófico nas aulas de filosofia do Ensino Médio
Authors: Vieira Wilson José , Horn Geraldo Balduíno
Published: July 2019

O artigo mostra a importância do uso do texto de Filosofia nas aulas de Filosofia do Ensino Médio. Os textos estão presentes nas salas de aula, mas nem sempre a formação do professor e as condições de trabalho lhe possibilitam utilizar o texto de maneira efetiva. A utilização do texto de filosofia de forma dinâmica, significativa e articulada à realidade cotidiana do estudante ainda é um desafio a ser enfrentado por maior parte dos professores. Como chegar às questões filosóficas de forma significativa e como desenvolver o “filosofar” com os estudantes e não apenas “ler” o texto de filosofia? Como encontrar o equilíbrio no uso do texto de Filosofia e não desenvolver no Ensino Médio uma espécie de propedêutico do curso de graduação em Filosofia? Essas são algumas das questões que serão abordadas no percurso desse artigo.
La relación entre la internacionalización y la eficiencia en las Organizaciones No Lucrativas
Authors: Queiruga Dolores , Salazar Idana , Vargas Pilar
Published: July 2019

El estudio de la estrategia de internacionalización de las empresas ha recibido mucha atención en el ámbito de la dirección de empresas. Sin embargo, el análisis de esta decisión en el ámbito de las Organizaciones No Lucrativas apenas ha sido investigado. El objetivo de nuestro trabajo es analizar la relación que existe entre la estrategia de internacionalización y la eficiencia en las Organizaciones No Lucrativas en España. Para este fin, hemos construido una base de datos a partir de la información suministrada por la Fundación Lealtad. Los resultados indican que la internacionalización se relaciona con la eficiencia en forma de U.
Iniciativas sociales, económicas y ambientales: su impacto en la opinión de la base asociativa de una Cooperativa de Ahorro y Crédito de Costa Rica
Authors: Masís Solano Paul , Gómez Pescador Irune , Arzadun Paula
Published: July 2019

Los inicios del cooperativismo costarricense se remontan al siglo XIX, con unas primeras expresiones que perseguían la satisfacción de necesidades de productores y trabajadores agrícolas. En el año 1943, ya existiendo 23 empresas cooperativas, surgió la primera legislación a favor del sector. Actualmente existen 594 cooperativas de adultos y escolares, y 887.335 personas asociadas a ellas. De acuerdo con el último Censo Nacional Cooperativo (Instituto Nacional de Fomento Cooperativo – INFOCOOP, 2012), el 22,2% de las cooperativas costarricenses pertenece al sector de finanzas y seguros, ocupando el primer lugar en el ranking de principal actividad económica de las cooperativas. Entre ellas se encuentra CoopeAnde Nº1 R.L, foco de análisis de la presente investigación. Se trata de una entidad que surgió en el año 1965 con el propósito de brindar una solución financiera a personas del sector educación. Actualmente cuenta con 57.000 asociados en todo el país. A partir de un trabajo de campo realizado a nivel nacional entre los meses de diciembre de 2013 y febrero de 2014, con una muestra total de 2.223 casos, se pretende medir el impacto de una serie de iniciativas sociales, ambientales y económicas en la opinión de la base asociativa, así como su percepción y valoración respecto a temáticas socioeconómicas y ambientales.