bluuebunny/crossref_metadata_2025_split huggingface dataset:
Vibration characteristics of functionally graded carbon nanotube reinforced composite rectangular plates on Pasternak foundation with arbitrary boundary conditions and internal line supports
Authors: Zhong Rui , Wang Qingshan , Tang Jinyuan , Shuai Cijun , Liang Qian 
Published: February 2018

Abstract
This paper presents the first known vibration characteristics of moderately thick functionally graded carbon nanotube reinforced composite rectangular plates on Pasternak foundation with arbitrary boundary conditions and internal line supports on the basis of the firstorder shear deformation theory. Different distributions of single walled carbon nanotubes (SWCNTs) along the thickness are considered. Uniform and other three kinds of functionally graded distributions of carbon nanotubes along the thickness direction of plates are studied. The solutions carried out using an enhanced Ritz method mainly include the following three points: Firstly, create the Lagrange energy function by the energy principle; Secondly, as the main innovation point, the modified Fourier series are chosen as the basic functions of the admissible functions of the plates to eliminate all the relevant discontinuities of the displacements and their derivatives at the edges; Lastly, solve the natural frequencies as well as the associated mode shapes by means of the Ritz-variational energy method. In this study, the influences of the volume fraction of CNTs, distribution type of CNTs, boundary restrain parameters, location of the internal line supports, foundation coefficients on the natural frequencies and mode shapes of the FG-CNT reinforced composite rectangular plates are presented.
Modeling the North American vertical datum of 1988 errors in the conterminous United States
Authors: Li X. 
Published: February 2018

Abstract
A large systematic difference (ranging from −20 cm to +130 cm) was found between NAVD 88 (North AmericanVertical Datum of 1988) and the pure gravimetric geoid models. This difference not only makes it very difficult to augment the local geoid model by directly using the vast NAVD 88 network with state-of-the-art technologies recently developed in geodesy, but also limits the ability of researchers to effectively demonstrate the geoid model improvements on the NAVD 88 network. Here, both conventional regression analyses based on various predefined basis functions such as polynomials, B-splines, and Legendre functions and the Latent Variable Analysis (LVA) such as the Factor Analysis (FA) are used to analyze the systematic difference. Besides giving a mathematical model, the regression results do not reveal a great deal about the physical reasons that caused the large differences in NAVD 88, which may be of interest to various researchers. Furthermore, there is still a significant amount of no-Gaussian signals left in the residuals of the conventional regression models. On the other side, the FA method not only provides a better not of the data, but also offers possible explanations of the error sources. Without requiring extra hypothesis tests on the model coefficients, the results from FA are more efficient in terms of capturing the systematic difference. Furthermore, without using a covariance model, a novel interpolating method based on the relationship between the loading matrix and the factor scores is developed for predictive purposes. The prediction error analysis shows that about 3-7 cm precision is expected in NAVD 88 after removing the systematic difference.
Transitivity pairs in Baltic: between Finnic and Slavic
Authors: Nau Nicole , Pakerys Jurgis 
Published: February 2018

Abstract
In this paper we examine transitivity pairs in the two modern Baltic languages Lithuanian and Latvian and compare them to neighbouring Finnic (Finnish, Estonian) and Slavic (Russian, Polish) languages. In Slavic the main strategy is to derive the intransitive (noncausal) verb from the transitive (causal) verb, while in Finnic we find a high number of derived causatives. Baltic uses both techniques, and in addition, there is a higher number of pairs where either both verbs are marked, or two etymologically related verbs are underived from a synchronic point of view. Differences and similarities across the six languages are investigated, using a list of 20 notions divided into five groups. Special attention is paid to animacy and to the distinction between inchoative and durative noncausal verbs.
Functions of valency operators in Kamas
Authors: Klumpp Gerson 
Published: February 2018

AbstractThis article provides an account of the functional range of Kamas valency operators. Kamas is an extinct South Siberian language of the Samoyed branch of Uralic, which was in close contact with Turkic for many centuries. In the early 20th century, Kamas had two valency operators: (i) -Tə derived transitive from intransitive verbs as well as causative from transitive verbs; and (ii) -Ō derived intransitive from transitive verbs; in addition the intransitivizer, probably departing from pairs like edə- ‘hang up (tr.)’ > ed-ȫ- ‘hang (itr.)’, had acquired the function of specifying imperfective state-of-affairs, e.g. iʔbə- ‘lie down, lie’ > iʔb-ȫ- ‘lie’. The two markers may occur in combination in the order “increase-decrease” (-T-Ō), but not vice versa. While on the one hand the valency operators may be understood as verb derivation morphemes proper, i.e. verbs derived with the suffixes -Tə- and -Ō- are considered new lexical entries, their functional range also covers combinations with participles otherwise unspecified for voice. The valency decreaser -Ō occurs with participles of transitive verbs in order to specify P-orientation. The valency increaser -Tə has a variety of causative readings, among them causative-reflexive, causative-permissive, and causative-instrumental, and it also qualifies as a marker of control and/or characterizing activity. The discussion in this article is focused mainly on classificational issues.
Structural, optical, thermal and NLO behavior of zinc hydrogen maleate dihydrate single crystal
Authors: Karuna S. , Balu A.R. , Muthu S. , Shyamala D. , Delci Z. , Ramkumaar G.R 
Published: February 2018

Abstract
Single crystal of zinc hydrogen maleate dihydrate (ZHMD) is grown by slow evaporation method at room temperature. The compound crystallizes in triclinic system with noncentrosymmetric space group P1. FT-IR and FT-Raman spectra of ZHMD are recorded. The versatile DFT is employed to understand the band structure of the crystal. Dipole moment of the molecule, ionization energy and electron affinity are established. The potential energy distribution PED of the vibrational modes is calculated using VEDA4. The results of the optimized molecular structure are compared with the single crystal XRD data. The Mulliken and NBO charges are calculated and interpreted. Optical properties of the grown crystal are analyzed using UV-Vis spectrum. Energy gap determined by Tauc plot is in a good agreement with the theoretical value calculated from HOMO-LUMO energies. Thermogravimetric analysis is done to assess the thermal behavior of the ZHMD crystal. Various thermodynamic parameters are calculated using the basis set B3LYP. The first order hyperpolarizability values of ZHMD establish its NLO nature. The molecular electrostatic potential MEP of the molecule is obtained. Third-order nonlinear response is studied using Z-scan technique and the corresponding parameters such as absorption coefficient, refractive index and third-order susceptibility are determined.
Negotiating race in post-apartheid South Africa: Bernadette’s stories
Authors: Bock Zannie 
Published: February 2018

AbstractContemporary scholarship on race investigates how racism is deeply embedded in everyday norms and practices in ways which subtly, even unwittingly, serve to reproduce white domination. In South Africa, like many other postcolonial societies, racial constructs continue to be particularly salient. This paper focuses on how a young South African, Bernadette, navigates the complex terrain of racial positioning in a focus group interview with her peers. Drawing primarily on Labov’s seminal work on narrative, as well as more recent interactional approaches, it investigates how Bernadette uses the reported speech of others in her stories as a key narrative strategy for racial positioning. The analytical findings suggest that despite her efforts to distance herself from what she perceives as racist talk, she slips into a racializing discourse which is much less overt than that which she rejects, and which has the effect of reassembling the apartheid hierarchy as an explanatory framework. This paper argues that a narrative lens enables the researcher to begin uncovering the multilayered complexities of racial positioning and the subtle ways in which racial discourses circulate in contemporary talk.
POTENSI LIMBAH KULIT JERUK NIPIS (Citrus auronfolia) SEBAGAI INHIBITOR TIROSINASE
Authors: Hindun Siti , Rusdiana Taofik , Abdasah Marline , Hindritiani Reti 
Published: February 2018

Hiperpigmentasi merupakan kelainan kulit wajah yang umum terjadi, terutama karena adanya peningkatan melanogenesis, dengan gambaran berupa warna kulit menjadi hitam atau coklat kehitaman. Kelainan ini terdapat pada beberapa macam penyakit kulit diantaranya melasma, melanoderma paska inflamasi, lentigo solaris dan freckles. Salah satu prinsip penanganan hiperpigmentasi yaitu menghambat sintesis melanin yang dapat dilakukan dengan menggunakan agen depigmentasi yang mekanisme kerjanya menghambat aktivitas enzim tirosinase. Penelitian ini bertujuan untuk menguji potensi kulit jeruk nipis sebagai inhibitor tirosinase. Kulit jeruk nipis diektraksi dengan etanol 96 %, identifikasi flavonoid, menghitung flavonoid total, kemudian diuji inhibisi tirosinase menggunakan instrumen microplate reader (ELISA). Hasil penelitian ekstrak kulit jeruk mengandung flavonid, dengan total flavonid totalnya 0,667 % b/b dan inhibition concentration (IC) 50 42,11 mg/mL, Kulit jeruk berpotensi sebagai inhibisi tirosinase.Kata kunci: Citrus auronfolia, Hiperpigmentasi, IC50, Tirosinase
Non-native species in the vascular flora of the national park «Samarsky Bir»
Authors: Baranovski B. A. 
Published: February 2018

Results of non-native flora surveys on Samara Dniprovska River valley within the designed National Park «Samarsky Bir» were analyzed in the paper. Scientific justification on first stage creation of the national-level National Park «Samarsky Bir» was prepared in 2012. Its area included the main park area with floodplain, arena and gully landscapes of the rivers Samara and Oril interstream. List of vascular plant species on floodplain, arena and gully habitats of Prisamar'ya counted 887 species. They are classified as 5 divisions, 6 classes, 108 families, 429 genera. This article presents a list of non-native flora fraction with bioecological characteristic of the plant species. The surveys were conducted by conventional methods on vascular flora studying. Analysis of the main plant ecomorphs was carried out by A. L. Belgard ecomorph system (1950). Invasion of plant species in the steppe zone of Ukraine has a long history complicated by significant anthropogenic transformation of the territory. We investigated the status of non-native plants, their ecomorphs, and tendency to invasiveness on the territory of National Park «Samarsky Bir» designed. Presence of 195 adventitious vascular plant species belonging to 48 families was determined. Of them, 7 families with the greatest abundance of non-native species contained 113 taxa (58 % of the total); 20 families were represented with 2–7 advents, and 20 families contained only 1 non-native species. Thus, today the share of non-native species in the vascular flora of the region accounted for nearly 22 %. Most of adventitious species are mesoxerophytes and xeromesophytes. In a cenomorphic relationship, vegetation being ruderal on the territory of Ukraine is dominated in composition of non-native flora. Within the total number of adventitious species, archaeophytes amount up 44 %, whereas neophytes come up to 56 %. The greatest abundance of adventitious species has been found in Brassicaceae, Asterasea and Poaceae families (15 %, 12 %, and 11 % of the total, respectively). 119 non-native vascular plant species were found in the steppe cenoses, 79 species in the gully and watershed forests, 90 species in floodplain forests, and 52 species on the territory of the sandy terrace. Among all the non-native species, 28 species have been identified as invasive, and there was a trend to increased invasiveness of some species in recent years. Among heterogenous species 12 of them were identified as invasive, and there was a tendency to increase theinvasiveness of some species in recent years. The analysis provided on non-native flora in the National Park evidences significant anthropogenic transformation of the territory; that requires establishment of appropriate regime on protection of this important ecological object.
Bogovin A. V., Ptashnik M. M., Dudnik S. V. Restoration of productive, environmentally stable grass biogeocenoses on anthropo-transformed foodophotopes. – Kyiv: Center for Educational Literature, 2017. – 356 p.
Authors: Bilova N. A. 
Published: February 2018

In the monograph under review on the basis of long fundamental research and critical analysis of materials of domestic and foreign scientists, the main regularities of the restoration of herbaceous phytocenoses on anthropotransformed lands are highlighted. The dynamics of the ecological and biological structure of the restorative plant communities with the starting seeding of cultural perennial mixtures in combination with the seeds of wild herbs and without them is shown. The functional features of the successions, the dynamics of productivity and indicators of the fodder value of phytocoenoses are characterized, and the influence of agrotechnical measures on the rate of ecocenogenesis is covered. The technique of integrated index estimation of fodder quality of plant cenoses was developed and proposed for wide use, based on the species composition of the latter and the integrated-index status of phytocomponents in cenoses. For a large number of species of flowering plants provided index floral-individualistic characteristics.
Renta negativa y decrecimiento económico
Authors: Cante Maldonado Freddy Eduardo 
Published: February 2018

El objetivo del autor en este texto es la defensa de la siguiente hipótesis de trabajo: el creciente uso, alteración y extracción de recursos naturales, y la especulación monetaria, generan diversas rentas pero implican substracción de recursos no renovables y, además, generan una magnificada y acelerada degradación de la naturaleza, y producen costes sociales, por lo que la rentas deberían ser negativas. La metodología empleada consiste en exponer una lectura crítica del concepto convencional de renta y, con base en teorías económicas heterodoxas y no convencionales, y alguna evidencia empírica tomada de fuentes secundarias, hallar un resultado teórico, el cual consiste en la propuesta de renta negativa. Concretamente se discuten las rentas de combustibles fósiles, del oro, y del dinero. Al final se muestran algunas pautas de cómo funcionaría la renta negativa. La principal implicación de este estudio es que la renta negativa conduce a una política económica orientada hacia el decrecimiento.
Análisis cristalográfico, morfológico, eléctrico, óptico y magnético del nuevo material Dy2BiFeO6
Authors: Roa-Rojas Jairo 
Published: February 2018

En este trabajo reportamos el análisis estructural, morfología superficial, ordenamiento magnético, respuesta dieléctrica y característica óptica de la nueva perovskita compleja Dy2BiFeO6. Las muestras fueron producidas mediante reacción de estado sólido. El análisis cristalográfico fue realizado a través de refinamiento Rietveld de los patrones experimentales de rayos X. Los resultados muestran que este material cristaliza en una perovskita ortorrómbica correspondiente al grupo espacial Pnma (#62). Por medio del ajuste de Curie-Weiss a la respuesta de la susceptibilidad magnética en función de la temperatura se estableció que el ordenamiento magnético se relaciona con una transición paramagnético-antiferromagnético con una temperatura de Weiss θ=-18,5 K, la cual es acorde con el comportamiento del inverso de la susceptibilidad en función de la temperatura, y una temperatura de Néel TN=50,8 K. La constante de Curie permitió determinar un momento magnético efectivo de 15,7 μB. Medidas de magnetización en función del campo aplicado a T=50 K, muestran un débil comportamiento histerético, que corrobora el ordenamiento magnético presente a esa temperatura. Mediciones de la constante dieléctrica en función de la frecuencia aplicada a temperatura ambiente dan como resultado una alta constante dieléctrica relativa a bajas frecuencias (ε=780). La curva de reflectancia en función de la longitud de onda revela el comportamiento típico de un material de tipo perovskita doble y permite la obtención de la brecha de energía de 2,74 eV característico de un material semiconductor.
Penerapan Model Pembelajaran OPEK Fisika pada Materi Suhu dan Kalor dan Pengaruhnya terhadap Practical Skill Siswa SMA
Authors: Afriyanti Afriyanti , Sumardi Yosaphat 
Published: February 2018

<p class="AbstractEnglish"><strong>Abstract:</strong>. The contribution of physics instruction in the schools to face the ASEAN Economic Community can be realized by applying the instruction model that focus on the theoretical approach and practical approach. OPEK Physics instruction model is the instruction model based on practical approach by stimulating the practical skills of students. This study aims to examine the effect of the use of OPEK Physics instruction model on temperature and heat material to increase practical skill of the high school students. This study was conducted at SMAN 7 Yogyakarta by using pretest-posttest control group design. Practical skill of students are measured by tests and observations sheet. The results of this study is that there is a significant difference in the improvement of practical skill of the students who are taught by using OPEK Physics instruction model those who are taught not by using this intruction model. </p><p class="KeywordsEngish"> </p><p class="AbstrakIndonesia"><strong>Abstrak:</strong><strong> </strong>Kontribusi pembelajaran fisika di sekolah dalam menghadapi Masyarakat Ekonomi ASEAN dapat diwujudkan dengan menerapkan model pembelajaran yang mengedepankan pendekatan teoritis dan pendekatan praktik. Model pembelajaran OPEK Fisika merupakan model pembelajaran yang berbasis pendekatan praktik dengan menstimulus <em>practical skill</em> siswa. Penelitian ini bertujuan untuk menguji pengaruh penggunaan model pembelajaran OPEK Fisika pada materi suhu dan kalor terhadap peningkatan <em>practical skill</em> siswa SMA. Penelitian ini dilakukan di SMAN 7 Yogyakarta dengan menggunakan desain penelitian <em>pretest-posttest control group design</em>. <em>Practical skill</em> siswa diukur dengan tes dan observasi. Hasil penelitian menunjukkan bahwa terdapat perbedaan peningkatan practical skill yang signifikan antara siswa yang dibimbing dengan model pembelajaran OPEK Fisika dan siswa yang tidak menggunakan model tersebut.</p><p class="KataKunci"><strong></strong><em><br /></em></p>
Penumbuhan Lapisan Tipis Barium Titanat (BaTiO3) menggunakan Metode Sol-Gel dengan Variasi Mol
Authors: Setyadi Ayu Uswatu Lissa Sapta , Iriani Yofentina , Nurosyid Fahru 
Published: February 2018

<p class="AbstractEnglish"><strong>Abstra</strong><strong>ct</strong><strong>:</strong><strong> </strong>Preparation of Barium Titanate thin film (BaTiO3) has been done on Quartz substrate using sol gel method with spin coating technique. A thin film BaTiO3 wase made with a mole variation of 0.4 mol and 0.8 mol at a rotation speed of 3000 rpm. The samples were annealed at 400 ° C with 30 minutes stand-up time and at 900 ° C with 2 hours stand-up time and a heating rate of 5 ° C per minute. Characterization of optical properties samples was performed using UV-Vis spectrometers and characterization of microstructure samples using X-Ray Diffraction (XRD). The particle size was calculated by Scherer's formula. Based on the results of the analysis it was found that mole variation of the solution influenced the absorbance value, intensity, crystality level and BaTiO3 thin film particle size. The greater mole of BaTiO<sub>3</sub> solution the higher then absorbance value. The fewer then number of layers the greater then diffraction peak intensity. More number of layers the greater the level of crystallinity and particle size.</p><p class="KeywordsEngish"> </p><p class="AbstrakIndonesia"><strong>Abstra</strong><strong>k: </strong>Pembuatan lapisan tipis Barium Titanat (BaTiO<sub>3</sub>) telah dilakukan diatas substrat Quartz menggunakan metode sol gel dengan teknik spin coating. Lapisan tipis BaTiO<sub>3 </sub>dibuat dengan variasi mol 0.4 mol dan 0.8 mol pada kecepatan putar 3000 rpm. Sampel diannealing pada suhu 400<sup>o</sup>C dengan waktu tahan 30 menit dan pada suhu 900<sup>o</sup>C dengan waktu tahan 2 jam dan kenaikan suhunya 5<sup>o</sup>C per menit. Karakterisasi sifat optik sampel dilakukan menggunakan spektrometer UV-Vis dan karakterisasi struktrur mikro sampel menggunakan X-Ray Diffraction (XRD).Ukuran partikel dihitung dengan formula Scherer. Berdasarkan hasil analisis didapat bahwa variasi mol larutan mempengaruhi mempengaruhi nilai absorbansi, intensitas, tingkat kekristalan dan ukuran partikel lapisan tipis BaTiO<sub>3</sub>. Semakin besar mol larutan BaTiO<sub>3 </sub>maka semakin tinggi nilai absorbansinya. Semakin sedikit jumlah lapisan maka intensitas puncak difraksi semakin besar. Semakin banyak jumlah lapisan maka semakin besar pula tingkat kekristalan dan ukuran partikel<em>. </em></p>
Tingkat Pemahaman Konsep Mahasiswa Pendidikan Fisika Universitas Sebelas Maret pada Materi Momentum
Authors: Rosa Geraldin Cintia , Cari C , Aminah Nonoh Siti 
Published: February 2018

<p class="AbstractEnglish"><strong>Abstract: </strong>Understanding concepts on the momentum material owned by students is vary. Some students have understood the concept in accordance with scientific truth, but some are not yet. Constraints experienced by students in understanding the concept can lead to misconception. This study aims to analyze the level of understanding of student concepts on the momentum material by using qualitative descriptive method. The subjects of this research are 33 students of Physics Education of Sebelas Maret University who have not received Basic Physics course. Data were collected by tests and interviews. The results showed that 77.27% of students experienced misconceptions on the transfer of energy of mutually colliding objects. Momentum and impulse materials have been taught in the XI Senior High School, though most students have not understood the concept as a whole.</p><p class="KeywordsEngish"> </p><p class="AbstrakIndonesia"><strong>Abstrak: </strong>Pemahaman konsep pada materi momentum yang dimiliki mahasiswa berbeda-beda. Sebagian mahasiswa sudah memahami konsep sesuai dengan kebenaran ilmiah, namun ada juga yang belum. Kendala yang dialami mahasiswa dalam pemahaman konsep tersebut dapat menimbulkan terjadinya miskonsepsi. Penelitian ini bertujuan untuk menganalisis tingkat pemahaman konsep mahasiswa pada materi momentum dengan menggunakan metode deskriptif kualitatif. Subjek penelitian yang digunakan adalah 33 mahasiswa Semester 1 Pendidikan Fisika Universitas Sebelas Maret yang belum menerima mata kuliah Fisika Dasar. Data dikumpulkan dengan tes dan wawancara. Hasil penelitian menunjukkan 77,27% mahasiswa mengalami miskonsepsi pada transfer energi benda yang saling bertumbukan. Materi momentum dan impuls sudah diajarkan di kelas XI SMA, meskipun demikian sebagian besar mahasiswa belum memahami konsep secara keseluruhan.</p>