bluuebunny/crossref_metadata_2025 huggingface dataset:
RESPON TERHADAP PEMBELAJARAN MOBILE BERBASIS KEARIFAN LOKAL DAN KEPARIWISATAAN PADA MAHASISWA PENDIDIKAN BIOLOGI
Authors: Anjani Isya , Sutrisky Lalu Edo , Ramdani Ali , Khery Yusran
Published: March 2020

This study aims to determine the response of students to learning mobile technology based on local wisdom and tourism using descriptive methods. The subjects of this study were 37 Biology Education Study Program students in the first semester of Mandalika Education University in the odd semester of the academic year 2019-2020. This research was conducted with a saturated sampling technique. Student response data obtained by a research questionnaire. Data were analyzed using diagram data. The results showed that students' responses to learning based on local wisdom and tourism were very high. On average 88.5% of lecturers use mobile technology as a means of communication and discussion with students, while the lowest is 69.6%, where only a few lecturers make mobile applications for learning needs. And on average only a few use and link mobile technology with local wisdom products and tourism.
Pengaruh Keputusan Investasi, Kebijakan Dividen dan Pengungkapan Laporan Berkelanjutan terhadap Nilai Perusahaan
Authors: Anis Aniqoh Siti , Budiantoro Harry
Published: March 2020

Penelitian ini bertujuan untuk menguji Pengaruh Keputusan Investasi, Kebijakan Dividen, dan Pengungkapan Laporan Berkelanjutan Terhadap Nilai Perusahaan. Metode penelitian yang digunakan adalah metode penelitian kuantitatif dan menggunakan data sekunder yaitu perusahaan pada kategori perusahaan Indeks LQ45 yang tercatat di Bursa Efek Indonesia. Sampel yang digunakan sebanyak 5 perusahaan dengan periode tahun 2012-2018 melalui metode purposive sampling. Metode analisis yang digunakan adalah regresi linier berganda dengan menggunakan aplikasi SPSS versi 25.0. Hasil dari penelitian ini menunjukkan secara simultan Keputusan Investasi, Kebijakan Dividen, dan Pengungkapan Laporan Bekelanjutan berpengaruh signifikan terhadap Nilai Perusahaan. Selanjutnya, secara parsial Keputusan Investasi dan Kebijakan Dividen berpengaruh positif terhadap Nilai Perusahaan dan Pengungkapan Laporan Berkelanjutan tidak berpengaruh dan terhadap Nilai Perusahaan
Pengaruh Sistem Perbankan, Makroekonomi, Dinamika Pasar Keuangan terhadap Perkembangan Sukuk Korporasi
Authors: Shabrina Zusryn Alyta , Umar Al Hashfi Rizqi , Hagabean Nasution Ananta
Published: March 2020

Tujuan pada penelitian ini adalah untuk mengetahui faktor-faktor yang berpengaruh terhadap perkembangan sukuk korporasi di Indonesia. Data yang digunakan adalah data bulanan tahun 2013-2016 variabel makroekonomi, crude oil price, kredit perbankan konvensional, interest rate spread, aset perbankan syariah, outstanding obligasi korporasi indonesia, nilai kapitalisasi pasar saham syariah, dan standar deviasi Jakarta Interbank Offered Rate (JIBOR). Pada penelitian ini menggunakan analisis data time series yaitu Autoregressive Distributed Lag (ARDL) yang merupakan pengembangan dan melengkapi kelemahan dari analisis Vector Autoregresive (VAR). Penelitian ini menunjukkan bahwa terdapat pengaruh positif harga minyak mentah dunia, perkembangan obligasi korporasi, dan aset perbankan syariah terhadap perkembangan sukuk korporasi. Selain itu, kapitalisasi pasar saham syariah, interest rate spread, dan volatilitas suku bunga pasar berdampak negatif terhadap perkembangan sukuk korporasi. Hasil tersebut menunjukkan adanya peningkatan permintaan dan penawaran pada sukuk korporasi di Indonesia. Penelitian ini menemukan adanya hubungan komplementer pada obligasi korporasi dan perbankan syariah pada perkembangan sukuk korporasi sehingga diharapkan adanya sinergi dan koordinasi para pemangku kepentingan yaitu pemerintah, pelaku industri, perusahaan dan pihak-pihak terkait
Analisis Pengaruh Motivasi, Kompensasi, dan Pengembangan SDM Terhadap Kinerja Anak Buah Kapal Deck Departement Melalui Variabel Intervening Kepuasan Kerja
Authors: Suganjar Suganjar , Hermawati Renny
Published: March 2020

Hasil internal audit yang dilakukan pada PT Halmahera menemukan suatu fenomena bahwa terdapat penurunan kinerja Anak Buah Kapal Deck Departement pada setiap kapal yang dimiliki oleh perusahaan tersebut sepanjang tahun 2017 dan 2019. Data yang didapatkan menunjukkan bahwa  terdapat penurunan jumlah Anak Buah Kapal Deck Departement di perusahaan tersebut yang memiliki penilaian kinerja Baik dan Sangat Baik. Sedangkan untuk  Anak Buah Kapal Deck Departement dengan penilaian kinerja Cukup, Buruk dan Sangat Buruk mengalami peningkatan. Hal tersebut menjadikan indikasi bahwa terdapat permasalahan kinerja di PT Halmahera yang kemudian menjadi acuan agar melakukan penelitian terhadap kinerja Anak Buah Kapal Deck Departement. Untuk dapat menjawab permasalahan kinerja yang terjadi di perusahaan tersebut, dilakukan dengan menggunakan pendekatan variabel motivasi, kompensasi, pengembangan SDM, kinerja, serta menggunakan kepuasan kerja sebagai variable intervening. Berbagai Data yang digunakan dalam penelitian ini, diperoleh melalui wawancara. Wawancara tersebut dilakukan dengan menggunakan kuesioner yang diberikan pada 115 responden Anak Buah Kapal Deck Departement di PT Halmahera. Selanjutnya data tersebut  digunakan untuk melakukan pengujian terhadap model serta untuk menganalisa pengaruh antar variabel diatas dengan pendekatan Structural Equation Modeling (SEM) dengan program AMOS. Setelah dilakukan pengujian, hasil yang didapatkan menunjukkan bahwa  motivasi, kompensasi serta pengembangan SDM, secara statistik terbukti berpengaruh signifikan positif terhadap kepuasan kerja sedangkan yang terbukti berpengaruh signifikan positif terhadap kinerja hanya pengembangan SDM dan motivasi, pengaruh kompensasi terhadap kinerja tidak dapat dibuktikan dalam studi ini.
Analisis Kualitas Pelayanan Transportasi Laut (Survei pada Perusahaan Pelayaran di Pelabuhan Tanjung Priok, 2015)
Authors: Sumardi Sumardi
Published: March 2020

Penelitian ini bertujuan untuk menganalisis kualitas pelayanan transportasi laut Pelabuhan Tanjung Priok, Jakarta.  Penelitian menggunakan metode SERVQUAL untuk mengukur kualitas pelayanan yang diterima pelanggan berdasarkan model kualitas pelayanan (gap model). SERVQUAL bertujuan untuk mengukur lima dimensi kualitas pelayanan yaitu: bukti fisik, keandalan, daya tanggap, jaminan, dan empati yang didasarkan pada analisis kesenjangan (gap analysis) antara harapan dan kinerja pelayanan. Penelitian menggunakan instrumen berupa kuesioner dengan melibatkan 91 perusahaan pelayaran yang diambil dengan teknik acak sederhana.  Data penelitian selanjutnya dianalisis dengan analisis Servqual. Hasil penelitian menunjukkan bahwa secara umum kinerja pelayanan Pelabuhan Tanjung Priok dinilai perusahaan pelayaran cukup baik dan tingkat harapan pelayanan tergolong tinggi. Dimensi pelayanan yang dianggap paling penting adalah keandalan, bukti fisik, daya tanggap, jaminan dan empati. Untuk meningkatkan kualitas pelayanan terhadap perusahaan pelayaran, maka perlu melakukan perbaikan pelayanan dengan urutan prioritas: bukti fisik, keandalan, daya tanggap, jaminan, dan empati. Upaya perbaikan juga perlu mengacu pada hasil diagram kartesius, yaitu dengan berusaha mempertahankan atribut-atribut pelayanan pada kuadran B, meningkatkan perbaikan atribut pelayanan kuadran A, dan mengurangi upaya-upaya yang dilakukan terhadap atribut pelayanan pada kuadran C. selain itu, perlu juga dilakukan penelitian lebih lanjut tentang kualitas pelayanan dengan menggunakan dimensi kualitas pelayanan lain, seperti 7S dari McKinsey yang dianalisis dengan menggunakan pendekatan kualitatif.
Identifikasi Pendekatan Shallow Water Equation Dalam Simulasi 2D Gelombang Tsunami di Pantai Keburuhan Purworejo
Authors: Hartanto Benny , Astriawati Ningrum
Published: March 2020

Kabupaten Purworejo merupakan salah satu dari lima daerah yang terkena dampak run-up tsunami Jawa 17 Juli 2006. Berdasarkan hasil Rapid Survey oleh BPDP dan BPPT, sepanjang Pantai Keburuhan merupakan lokasi terjadinya run-up tsunami di Kabupaten Purworejo di koordinat 109.912 LS -7.85 BT sebesar 1,7 meter. Tujuan dari penelitian ini adalah memperkirakan waktu tempuh tsunami, distribusi tinggi gelombang tsunami dan daerah jangkauan tsunami akibat dampak gempa tsunami Jawa 17 Juli 2006 di Pantai Keburuhan, Purworejo. Metode yang digunakan adalah metode deskriptif analitis dengan pendekatan kuantitatif. Data yang digunakan pada penelitian ini adalah titik tinggi, batimetri, parameter gempa, peramalan pasang surut wilayah perairan Pantai Keburuhan, data citra Geo Eye 1, dan kelerengan pantai. Pemodelan tsunami menggunakan perangkat lunak COMCOT v1.7 dengan kejadian gempa Jawa 17 Juli 2006. Berdasarkan pengolahan data, diketahui bahwa kecepatan gelombang maksimal sebesar 3.8788 m/s. Pada menit ke- 40, amplitudo awal gelombang tsunami sebesar 1.644  meter telah mencapai Pantai Keburuhan. Daerah jangkauan tsunami terluas dan jarak jangkauan maksimum terjauh  terjadi di Pantai Keburuhan adalah 1,23 km2 dan 1,4 km. Berdasarkan hasil verifikasi dengan nilai RSR sebesar 0,26. Hasil validasi simulasi tsunami menggunakan COMCOT v1.7 diketahui bahwa tinggi run-up tsunami model sudah cukup sesuai dengan data run-up yang terjadi saat kejadian, dengan nilai RSR sebesar 0,29 dan CF sebesar 1,63.
Pengembangan Model Bisnis Tentang Telekomunikasi di Perusahaan Berdasarkan Perspektif Pelanggan
Authors: Nurfadholi Zoellys Fix
Published: March 2020

Telekomunikasi sudah menjadi kebutuhan dalam setiap aktivitas. Berdasarkan hasil publikasi Badan Pusat Statistik (2018) jumlah pelanggan telepon seluler di Indonesia mencapai 319,4 juta. Berdasarkan angka tersebut terdapat potensi pasar yang besar karena dapat diasumsikan bahwa setiap pelanggan membutuhkan setidaknya satu buah nomor telepon, dan setiap nomor tersebut dibutuhkan biaya-biaya agar dapat digunakan untuk telekomunikasi seperti tagihan bulanan bagi pelanggan nomor pascabayar dan pulsa bagi pelanggan nomor prabayar. Kebutuhan telekomunikasi tidak hanya terjadi di tingkat individu namun juga terjadi di lingkungan organisasi seperti pada perusahaan yang nantinya akan dijadikan sebagai pasar sasaran utama dalam model bisnis. Potensi pasar yang besar memunculkan ide untuk membuat suatu konsep bisnis yang fokus pada segmen pelaggan perusahaan yang mampu memberikan kemudahan, keamanan, fleksibel, dan transparan sehingga dapat mempermudah aktivitas bisnis perusahaan dan mengurangi risiko kerugian akibat tunjangan komunikasi yang disalahgunakan.
Ethnomathematics and indigenous teacher education: Waka migrations
Authors: Trinick Tony , Tamsin Meaney Tamsin
Published: March 2020

In order to assist Indigenous peoples to revive their language and culture, teachers need strategies to enhance both cultural and mathematical knowledge for students. This paper presents findings from a project in which pre-service teachers investigated ethnomathematical practices using the context of ancestral ocean voyages by canoes. This context was chosen because a primary identification marker for Māori are their ancestral canoes. The results indicated that these pre-service teachers did not generally associate these ancestral voyages with mathematical practices, indicating that more work is needed to increase their understandings of ethnomathematics. Their understandings about the knowledge and practices connected to traditional methods of navigation were disrupted by myths perpetuated by European colonists. Despite this, a renaissance in canoe building and interest in traditional navigation practices provided the pre-service teachers with valuable information.
Ethnomathematical paths to Financial Educacion: analysing cultural traits of Deaf students
Authors: Pinheiro Rodrigo Carlos , Rosa Milton
Published: March 2020

Os resultados obtidos nessa pesquisa sobre os traços culturais produzidos por alunos Surdos no desenvolvimento de sua Educação Financeira estão de acordo com a perspectiva do Programa de Etnomatemática. Nesse artigo, os autores descrevem o perfil dos participantes e apresentam uma breve descrição da Teoria Fundamentada nos Dados, que foi o design metodológico utilizado para conduzir esse estudo por meio de procedimentos específicos de codificação. Os autores também enfatizaram a relação entre a Etnomatemática e a Cultura Surda através do emprego de jargões e procedimentos utilizados por estudantes Surdos no estudo de conteúdos matemáticos relacionados à Educação Financeira. São apresentadas, também, distintas maneiras de sinalizar o mesmo conteúdo matemático na Língua Brasileira de Sinais (Libras), bem como as diferenças comunicativas que surgem devido à variação desses sinais. Os resultados obtidos nesse estudo mostram que a Etnomatemática contribuiu para a compreensão e conscientização das características da Cultura Surda e as suas relações com a matemática escolar. Ademais, salienta-se que a Etnomatemática e a sua ação pedagógica adquiriram um status relevante na elaboração de um currículo matemático e no desenvolvimento da Educação Financeira para alunos Surdos.
Ethnomathematical study on folk dances: focusing on the choreography
Authors: Ribeiro Sara Cristina Magalhães Gomes , Palhares Pedro Manuel Baptista , Salinas María Jesús Salinas
Published: March 2020

The investigation in ethnomathematics we are developing aims to analyse the mathematical structure inherent in various elements that constitute folk dances of Northern Portugal and Galicia, which is an autonomous community of Spain, specifically choreography, music and accessories. Focusing on choreography, we intend to represent and describe the movements that dancers perform during dances. Different types of choreography were identified in folk dances based on dispositions that although dancers may not remain fixed through the dance, are those to which they end up returning. In addition, diagrams and numerical schemes were elaborated to represent the successive positions occupied by dancers or pairs through the folk dances. The mathematical ideas and procedures resulting from this ethnomathematical research will then be used for school practice, through the construction of tasks to be applied in the classroom.
Effects of resuspension of eastern oyster Crassostrea virginica biodeposits on phytoplankton community structure
Authors: Porter ET , Robins E , Davis S , Lacouture R , Cornwell JC
Published: March 2020

Anthropogenic disturbances in the Chesapeake Bay (USA) have depleted eastern oysterCrassostrea virginicaabundance and altered the estuary’s environment and water quality. Efforts to rehabilitate oyster populations are underway; however, the effect of oyster biodeposits on water quality and plankton community structure are not clear. In July 2017, we used 6 shear turbulence resuspension mesocosms (STURMs) to determine differences in plankton composition with and without the daily addition of oyster biodeposits to a muddy sediment bottom. STURM systems had a volume-weighted root mean square turbulent velocity of 1.08 cm s-1, energy dissipation rate of ~0.08 cm2s-3, and bottom shear stress of ~0.36-0.51 Pa during mixing-on periods during 4 wk of tidal resuspension. Phytoplankton increased their chlorophyllacontent in their cells in response to low light in tanks with biodeposits. The diatomSkeletonema costatumbloomed and had significantly longer chains in tanks without biodeposits. These tanks also had significantly lower concentrations of total suspended solids, zooplankton carbon, and nitrite +nitrate, and higher phytoplankton carbon concentrations. Results suggest that the absence of biodeposit resuspension initiates nitrogen uptake for diatom reproduction, increasing the cell densities ofS. costatum. The low abundance of the zooplankton population in non-biodeposit tanks suggests an inability of zooplankton to graze onS. costatumand negative effects ofS. costatumon zooplankton. A high abundance of the copepodAcartia tonsain biodeposit tanks may have reducedS. costatumchain length. Oyster biodeposit addition and resuspension efficiently transferred phytoplankton carbon to zooplankton carbon, thus supporting the food web in the estuary.
PENGARUH KEBIJAKAN DIVIDEND, LIKUIDITAS DAN LEVERAGE TERHADAP NILAI PERUSAHAAN
Authors: Syafawi Lely
Published: March 2020

Penelitian ini bertujuan untuk mengetahui pengaruh Kebijakan Dividend (KD), Likuiditas yang diproksikan oleh Current Ratio (CR) dan Quick Ratio (QR) dan Leverage (LG),  secara parsial dan  simultan terhadap nilai perusahaan (PBV) pada perusahaan LQ 45 di Bursa Efek Indonesia periode 2011-2015. Periode yang digunakan dalam penelitian ini adalah lima tahun yaitu mulai tahun 2011-2015. Populasi dalam penelitian ini adalah perusahaan-perusahaan  yang tergabung dalam perusahaan LQ 45  yang  sudah  dan masih terdaftar di Bursa Efek Indonesia  periode  2011-2015.  Sampel  diambil  dengan  menggunakan  metode Purposive Sampling, dari  populasi  sebanyak  45 perusahaan  diperoleh 10 perusahaan  sebagai  sampel. Data dianalisis dengan menggunakan regresi linier berganda. Berdasarkan hasil analisis data disimpulkan bahwa secara parsial Kebijakan Dividend, Current Ratio (CR), Quick Ratio (QR) dan Leverage berpengaruh tidak siginifikan terhadap  nilai  perusahaan. Berdasarkan hasil uji F, secara simultan  kebijakan dividen (KD), Current Ratio (CR), Quick Ratio (QR) dan Leverage (LG)  terhadap nilai perusahaan. Hal ini  ditunjukkan  oleh nilai F  hitung  sebesar  1.259  dan  nilai  signifikansi  0,395.  Nilai koefisien  determinasi  (adjusted R2)  sebesar  0,103  menunjukkan  bahwa  pengaruh kebijakan dividen (KD), Current Ratio (CR), Quick Ratio (QR) dan Leverage (LG) terhadap nilai perusahaan sebesar 10,3%, dan sisanya dijelaskan oleh variabel lain yang tidak diteliti dalam penelitian ini.Kata kunci: Nilai perusahaan, Kebijakan Dividend, Current Ratio, Quick Ratio dan Leverage
Manajemen Hubungan Pelanggan (CRM) dengan Kombinasi Media Sosial untuk Meningkatkan Penjualan
Authors: Fadly Muhtad , Wantoro Agus
Published: March 2020

Persaingan dunia bisnis di era globalisasi semakin ketat. Perusahaan dituntut untuk lebih inovatif dan kreatif dalam mengelola perusahaannya. Berkurangnya loyalitas pelanggan disebabkan oleh beberapa faktor : (1) banyaknya pilihan produk dan jasa (2) ketersediaan informasi (3) kebanyakan produk/jasa yang hampir sama dan (4) masalah keuangan konsumen. Tahun 2015 PT. Istana Lampung Raya yang merupakan perusahaan penjualan mobil Honda hanya mampu menjual kendaraan 980 unit. Angka ini tertinggal jauh dengan rivalnya Toyota yang mampu menjual 1300 unit. Untuk meningkatkan jumlah penjualan perlu dilakukan upaya peningkatan yang berimbas pada meningkatnya jumlah penjualan. Peningkatkan jumlah pelanggan dapat menerapkan strategi CRM dengan memanfaatkan teknologi dan media social menjadi alternatif yang dapat digunakan. Perkembangan media sosial mengalami peningkatan dalam jumlah pengguna. Rata-rata masyarakat Indonesia menggunakan media sosial dalam satu hari menghabiskan waktu selama 23 menit. Setiap harinya rata-rata ada 65 juta pengguna di Indonesia sebanyak 97% pengguna mengakses media sosial terbesar di dunia lewat smartphone. Banyaknya pengguna Media social menjadi peluang yang dapat dimanfaatkan dengan mengkombinasikan dengan CRM. Penerapan model CRM yang dikombinasi dengan pemanfaatan media sosial sebagai pengelola asset digital mampu meningkatkan jumlah pengikut di Instagram (IG) pada tahun 2018 sebesar 46.52% dan meningkatkan jumlah Surat Permintaan Kendaraan sebesar 27%.Kata Kunci : Management Hubungan Pelanggan, Medsos, Digital Aset, Pelanggan
BAGAIMANA NASIONALISME DAN PERSEPSI TENTANG PAJAK MEMPENGARUHI KEPATUHAN WAJIB PAJAK DALAM MEMBAYAR PAJAK BUMI DAN BANGUNAN DI PEDESAAN DAN PERKOTAAN (PBB-P2)
Authors: Darmawan Asmawi , Mulyadi Edi , Dahlan Jarnawi Afgani
Published: March 2020

The purpose of this study is to determine the relationship between independent variables and the dependent variable, which is used as the independent variable in the study, namely nationalism (X1) and perceptions of tax (X2) while the dependent variable is taxpayer compliance (Y). The way to solve the problem is to find out the relationship between nationalism and taxpayer compliance and perceptions of taxes with taxpayer compliance and the concurrent relationship between nationalism and perceptions about taxpayer compliance using quantitative methods. The chosen research respondents were the Rural and Urban Land and Building taxpayers in each Kelurahan in the Larangan City District of Tangerang. The results showed a significant relationship between nationalism and taxpayer compliance, and a significant relationship between perceptions of tax and taxpayer compliance and simultaneously nationalism and the perception of taxpayers had a significant relationship with taxpayer compliance. From the results of this study, a further study is needed to improve taxpayer compliance in paying Rural and Urban Land and Building Taxes related to factors other than nationalism and perceptions of taxes, namely taxpayer compliance in registering, taxpayer compliance to deposit SPPT, compliance in calculation and payment of outstanding taxes and compliance with payments and arrears.
ANALYSIS QUALITY OF HUMAN RESOURCES, WORK PROFESSIONALISM, AND COMMUNICATION AS SUPPORTING FACTORS FOR IMPROVING PERFORMANCE OF AVIATION TRAINING CENTER
Authors: Mulyanto Agus Iwan
Published: March 2020

The quality of human resources, work professionalism, communication has an influence on the performance of education and employment center employees in airlines both partially and simultaneously. The research approach used in this study is a quantitative approach. The aviation training center population was 79 employees and 75 people were taken as respondents with the sampling method used was simple random sampling or simple random samples. The method of data analysis uses multiple linear regression analysis. The results of testing and analysis conducted stated that the quality of human resources has a positive and significant effect on employee performance, work professionalism has a positive and significant effect on employee performance and communication has a positive and significant effect on employee performance. Simultaneously the quality of human resources, work professionalism, and communication support employee performance.
Influence of Alloy Content on Microstructure and Corrosion Resistance of Zn-based Alloy Coated Steel Product
Authors: Lee Jae-Won , Kim Sung-Jin , Oh Min-Suk
Published: March 2020

The effects of alloy composition on the coating structure and corrosion resistance of hot-dip Znbased alloy coated steel products were investigated. Zn-based alloy coating layers with different Al and Mg compositions were fabricated using a batch-type galvanizing simulator. Various intermetallic compounds including Zn, Zn/MgZn2 binary eutectic, Zn/Al binary eutectoid and Zn/Al/MgZn2 ternary eutectic phases were formed in the coating layer. The surface and cut-edge corrosion resistance of the Zn-based alloy coating were superior to those of the Zn coating. Zn-based alloy coating containing 15% Al and 3% Mg showed the best corrosion resistance, with red rust formed on the flat surface after 120 hours in the salt spray test. The corrosion products of the Zn-based alloy coating consisted of Simonkolleite (Zn5(OH)8Cl2·H2O), Hydrozincite (Zn5(CO3)2(OH) and zinc oxide (ZnO). Al-containing corrosion products, Zn2Al(OH)6Cl2·H2O and Al2O3, were formed when more than 5 wt% Al was added. Al-containing corrosion products improved the corrosion resistance of the flat surface of Zn-based alloy coating, but did not affect corrosion resistance in the cut-edge area.
Long-time Oxidation of Ti3(Al,Si)C2 Carbides at 400-800 oC
Authors: Hahn Junhee , Park Sang Whan , Lee Dong Bok
Published: March 2020

Quarternay carbides of Ti3AlxSi1-xC2 (x=0.3, 0.5, and 0.7) were oxidized at 400, 600, and 800 °C for 0.5-6 months in order to study their long-time oxidation behavior in air. When they were oxidized at 400-600 oC for 0.5-3 months, oxidation proceeded relatively slowly with moderate weight gains. However, further oxidation at 400-600 oC for 6 months resulted in the oxidation-induced microcracking of oxide scales due to large volume expansion and large stress induced owing to the formation of Al2O3, SiO2. TiO3, and TiO2 in oxide scales. However, at 800 oC, microcracking of oxide scales, which could lead to pulverization of Ti3AlxSi1-xC2, did not occur due to stress relaxation in oxide scales. Instead, at 800 oC, Ti3AlxSi1-xC2 oxidized rapidly to form thick, somewhat porous oxide scales, which consisted primarily of an outer TiO2 layer with some Al2O3, an intermediate Al2O3 layer with some TiO2, and an inner TiO2 layer with some (SiO2+Al2O3). The overall longtime oxidation resistance of Ti3AlxSi1-xC2 at 400-800 °C was considered to be poor. Factors that determined the oxidation rates of Ti3AlxSi1-xC2 were; (1) How fast titanium oxidized to semi-protective titanium oxides, (2) How fast Al and Si oxidized to Al2O3 and SiO2 barrier oxides, and (3) Whether oxidation-induced microcracking occurred in oxide scales or not. The ratio of Al/Si in Ti3AlxSi1-xC2 and the matrix grain size were apparently not dominant factors, because the basic oxidation mode of Ti3Al0.3Si0.7C2, Ti3Al0.5Si0.5C2, and Ti3Al0.7Si0.3C2 was similar under the identical oxidation condition.
Measurement of Intrinsic Hardness of Deposited Chromium Thin Films by Nanoindentation Method and Influencing Factors
Authors: Kang Young-Joon , Baeg Ju-Hwan , Park Hyun , Cho Young-Rae
Published: March 2020

Materials with very small dimensions exhibit different physical and mechanical properties compared to their bulk counterparts. This becomes significantly important for the thin films that are widely used as components in micro-electronics and functional materials. In this study, a chromium (Cr) thin film was deposited on a silicon (Si) wafer by DC-magnetron sputtering. The intrinsic hardness of the Cr thin film on Si-wafer was evaluated by the nanoindentation method. We especially investigated ways of measuring the intrinsic hardness of the Cr thin film, and influential factors including the substrate effect and surface roughness effect. To further characterize the intrinsic hardness of the Cr thin film on Si-wafer, we used Xray diffraction (XRD), scanning electron microscopy (SEM), and atomic force microscopy (AFM). Two additional methods, the Meyer-plot and a profile for hardness versus indentation depth, were also employed. As a result of these two methods, we found that the profile for hardness versus indentation depth was valuable for evaluating the intrinsic hardness of Cr thin film on a Si-wafer substrate. The measured intrinsic hardness of the Cr thin film and Si wafer were about 900 Hv and 1143 Hv, respectively. The profile for hardness versus indentation depth can be widely used to evaluate the intrinsic hardness of metallic thin films on substrates.
The Waiting Woman as the Most Enduring Asian Ghost Heroine
Authors: Ancuta Katarzyna
Published: March 2020

The waiting woman is a ghost who appears to be endlessly waiting – for recognition, for her lover, for a chance to reincarnate, or to exact revenge. In Asia, her roots can be found in early medieval Chinese records of the strange, arguably the oldest written ghost stories in the region. The romanticized version of this ghost, introduced in Tang Xianzu's drama Peony Pavillion ( Mudan ting, 1598), influenced many writers of Japanese kaidan (strange) stories and merged with East and Southeast Asian ghostlore that continues to inspire contemporary local fiction and films. The article proposes to read the figure of the waiting woman as a representation of the enduring myth of the submissive Asian femininity and a warning against the threat of possible female emancipation brought about by the socio-economic changes caused by modernisation.
‘My Mother, the Ap’: Cambodian Horror Cinema and the Gothic Transformation of a Folkloric Monster
Authors: Chronister Kay
Published: March 2020

The most prominent monster in Khmer horror cinema, the ap, is originally a creature of folklore and is traditionally depicted as a woman's glowing head connected to exposed, floating entrails. I begin with an overview of the ap's historical origins in Khmer folktales about female transgression and witchcraft. I then discuss the ap's reemergence in Gothic horror film following the Khmer Rouge genocide of 1975–1979. In film, unlike in folklore, the ap is depicted as an innocent woman who was violated and then denied justice from her insular rural society; her assumption of a monstrous spectral body serves to make visible and undeniable the otherwise invisible violence exacted upon her. In staging dramas of reckoning and unburial, I argue, ap film in twenty-first-century Cambodia performs the typically Gothic work of using folklore and the supernatural to speak about otherwise unspeakable past trauma.
Os entrecruzamentos socioculturais como performances em Rashomon de Akira Kurosawa
Authors: Vilela Anne Araujo
Published: March 2020

Este artigo examina as características históricas e sociais do filme Rashomon de Akira Kurosawa, pelo prisma das performances culturais, pois analisa os discursos de natureza sociocultural. O filme de 1950 consiste em uma adaptação de dois contos do escritor moderno japonês Ryunosuke Akutagawa (1892-1927) e possui uma estrutura extremamente rica quando visto à luz das performances.
Effect of Dietary Folic Acid Supplementation during Pregnancy on Blood Characteristics and Milk Composition of Ewes
Authors: Wang Bo , Li Zhen , Li Heqiong , Luo Hailing , Blair Hugh T. , Jian Luyang , Diao Zhicheng
Published: March 2020

The objective of the present study was to investigate the dynamic change of serum parameters and milk composition by dietary FA supplementation with ewes with different litter size from mating to lambing. The ewes were divided into six treatments (TW-CON, TW-F16, TW-F32, TR-CON, TR-F16, TR-F32) according to dietary FA levels (control, CON; 16 or 32 mg·kg−1 rumen-protect-FA supplementation, F16 and F32) and litter size (twin born, TW; and triplet born, TR). In serum, the concentration of folate increased linearly with dietary FA supplementation (P < 0.05), regardless of the litter size, they showed a quadratic response to gestation progression (P < 0.05). With dietary FA addition, IGFI-I levels significant increased from late gestation to after lambing (P < 0.05), and linearly increased immunoglobulin during the perinatal period (P < 0.05). In colostrum and milk at d 15, the content of folate, lactoferrin, and IgG were affected positively by FA supplementation (P < 0.05). IgG was higher in the TW group than TR in colostrum (P < 0.05), and lactoferrin in TW was lower than TR in milk of d 15 (P < 0.05). FA supplementation increased protein content in colostrum (P < 0.05), while it had no effect on the fat, lactose, and BUN of colostrum and milk of d 15 (P > 0.05). These results suggest that FA supplementation during gestation could regulate maternal blood metabolism and contribute to milk immune composition.
The Ground Effect in Anguilliform Swimming
Authors: Ogunka Uchenna E. , Daghooghi Mohsen , Akbarzadeh Amir M. , Borazjani Iman
Published: March 2020

Some anguilliform swimmers such as eels and lampreys swim near the ground, which has been hypothesized to have hydrodynamic benefits. To investigate whether swimming near ground has hydrodynamics benefits, two large-eddy simulations of a self-propelled anguilliform swimmer are carried out—one swimming far away from the ground (free swimming) and the other near the ground, that is, midline at 0.07 of fish length (L) from the ground creating a gap of 0.04 L . Simulations are carried out under similar conditions with both fish starting from rest in a quiescent flow and reaching steady swimming (constant average speed). The numerical results show that both swimmers have similar speed, power consumption, efficiency, and wake structure during steady swimming. This indicates that swimming near the ground with a gap larger than 0.04 L does not improve the swimming performance of anguilliform swimmers when there is no incoming flow, that is, the interaction of the wake with the ground does not improve swimming performance. When there is incoming flow, however, swimming near the ground may help because the flow has lower velocities near the ground.
Simulation and Training of Needle Puncture Procedure with a Patient-Specific 3D Printed Gluteal Artery Model
Authors: Rynio Paweł , Falkowski Aleksander , Witowski Jan , Kazimierczak Arkadiusz , Wójcik Łukasz , Gutowski Piotr
Published: March 2020

The puncture of the gluteal artery (GA) is a rare and difficult procedure. Less experienced clinicians do not always have the opportunity to practice and prepare for it, which creates a need for novel training tools. We aimed to investigate the feasibility of developing a 3D-printed, patient-specific phantom of the GA and its surrounding tissues to determine the extent to which the model can be used as an aid in needle puncture planning, simulation, and training. Computed tomography angiography scans of a patient with an endoleak to an internal iliac artery aneurysm with no intravascular antegrade access were processed. The arterial system, including the superior GA with its division branches, and pelvic area bones were 3D printed. The 3D model was embedded in the buttocks-shaped, patient-specific mold and cast. The manufactured, life-sized phantom was used to simulate the GA puncture procedure and was validated by 13 endovascular specialists. The printed GA was visible in the fluoroscopy, allowing for a needle puncture procedure simulation. The contrast medium was administered, simulating a digital subtraction angiography. Participating doctors suggested that the model could make a significant impact on preprocedural planning and resident training programs. Although the results are promising, we recommend that further studies be used to adjust the design and assess its clinical value.
Hybrid State Constraint Adaptive Disturbance Rejection Controller for a Mobile Worm Bio-Inspired Robot
Authors: Lara-Ortiz Vania , Salgado Ivan , Cruz-Ortiz David , Guarneros Alejandro , Magos-Sanchez Misael , Chairez Isaac
Published: March 2020

This study presents the design of a hybrid active disturbance rejection controller (H-ADRC) which regulates the gait cycle of a worm bio-inspired robotic device (WBRD). The WBRD is designed as a full actuated six rigid link robotic manipulator. The controller considers the state restrictions in the device articulations; this means the maximum and minimum angular ranges, to avoid any possible damage to the structure. The controller uses an active compensation method to estimate the unknown dynamics of the WBRD by means of an extended state observer. The sequence of movements for the gait cycle of a WBRD is represented as a class of hybrid system by alternative reference frameworks placed at the first and the last link. The stability analysis employs a class of Hybrid Barrier Lyapunov Function to ensure the fulfillment of the angular restrictions in the robotic device. The proposed controller is evaluated using a numerical simulation system based on the virtual version of the WBRD. Moreover, experimental results confirmed that the H-ADRC may endorse the realization of the proposed gait cycle despite the presence of perturbations and modeling uncertainties. The H-ADRC is compared against a proportional derivative (PD) controller and a proportional-integral-derivative (PID) controller. The H-ADRC shows a superior performance as a consequence of the estimation provided by the homogeneous extended state observer.
Investigation of Volumic Permanent-Magnet Eddy-Current Losses in Multi-Phase Synchronous Machines from Hybrid Multi-Layer Model
Authors: Benmessaoud Youcef , Ouamara Daoud , Dubas Frédéric , Hilairet Mickael
Published: March 2020

This paper investigates the permanent-magnet (PM) eddy-current losses in multi-phase PM synchronous machines (PMSM) with concentric winding and surface-mounted PMs. A hybrid multi-layer model, combining a two-dimensional (2-D) generic magnetic equivalent circuit (MEC) with a 2-D analytical model based on the Maxwell–Fourier method (i.e., the formal resolution of Maxwell’s equations by using the separation of variables method and the Fourier’s series), performs the eddy-current loss calculations. First, the magnetic flux density was obtained from the 2-D generic MEC and then subjected to the Fast Fourier Transform (FFT). The semi-analytical model includes the automatic mesh of static/moving zones, the saturation effect and zones connection in accordance with rotor motion based on a new approach called “Air-gap sliding line technic”. The results of the hybrid multi-layer model were compared with those obtained by three-dimensional (3-D) nonlinear finite-element analysis (FEA). The PM eddy-current losses were estimated on different paths for different segmentations as follow: (i) one segment (no segmentation), (ii) five axial segments, and (iii) two circumferential segments, where the non-uniformity loss distribution is shown. The top of PMs presents a higher quantity of losses compared to the bottom.
Ischemic Etiology and Clinical Outcomes Following Cardiac Resynchronization Therapy
Authors: Imamura Teruhiko
Published: March 2020

Optimal patient selection for cardiac resynchronization therapy is crucial. There are several concerns that allow to better clarify the association between the ischemic etiology of heart failure and the response to cardiac resynchronization therapy. The type of ischemic coronary disease has an impact on the responses to cardiac resynchronization therapy. The prognostic impact of cardiac resynchronization therapy on cardiac death including heart transplantation and durable ventricular assist device implantation is another concern.
Performance Recovery after Contamination with Nitrogen Dioxide in a PEM Fuel Cell
Authors: Acevedo Gomez Yasna , Lindbergh Göran , Lagergren Carina
Published: March 2020

While the market for fuel cell vehicles is increasing, these vehicles will still coexist with combustion engine vehicles on the roads and will be exposed to an environment with significant amounts of contaminants that will decrease the durability of the fuel cell. To investigate different recovery methods, in this study, a PEM fuel cell was contaminated with 100 ppm of NO2 at the cathode side. The possibility to recover the cell performance was studied by using different airflow rates, different current densities, and by subjecting the cell to successive polarization curves. The results show that the successive polarization curves are the best choice for recovery; it took 35 min to reach full recovery of cell performance, compared to 4.5 h of recovery with pure air at 0.5 A cm−2 and 110 mL min−1. However, the performance recovery at a current density of 0.2 A cm−2 and air flow 275 mL min−1 was done in 66 min, which is also a possible alternative. Additionally, two operation techniques were suggested and compared during 7 h of operation: air recovery and air depletion. The air recovery technique was shown to be a better choice than the air depletion technique.
Fluorescence Differentiation of ATP-Related Multiple Enzymatic Activities in Synovial Fluid as a Marker of Calcium Pyrophosphate Deposition Disease Using Kyoto Green
Authors: Yongwattana Nattha , Mekjinda Nutsara , Tawonsawatruk Tulyapruek , Hamachi Itaru , Ojida Akio , Wongkongkatep Jirarut
Published: March 2020

Calcium pyrophosphate deposition disease (CPPD) is a crystal induced inflammation in joints, and causes severe pain in elderly people. The accumulation of pyrophosphate (PPi) in synovial fluid (SF) results from several enzymatic reactions, especially the highly activated e-NPPs, which catalyze the conversion of ATP to PPi. This study demonstrates the detection of relative catalytic activity of 3 enzymes—ecto-nucleotide pyrophosphatase/phosphodiesterases (e-NPPs), tissue nonspecific alkaline phosphatase (TNAP), and ecto-nucleoside triphosphate diphosphohydrolases (e-NTPDases)—using a single molecular sensor called Kyoto Green. Kyoto Green exhibits excellent performance in sensing the catalytic activity of the commercial representatives of the e-NPPs, TNAP, and e-NTPDases, which are ENPP1, PPase, and apyrase, respectively, in both single-enzyme and multi-enzyme assays. Analysis of SF enzymes in 19 SF samples from human and swine revealed moderate activity of e-NPPs, high activity of e-NTPDases, and low activity of TNAP. Our newly developed method for analysis of multiple enzymatic activities using Kyoto Green in biological SF will assist improvement in accuracy of the CPPD prognosis/diagnosis, which will minimize unnecessary medical procedures.
Identification and Characterization of Cannabimovone, a Cannabinoid from Cannabis sativa, as a Novel PPARγ Agonist via a Combined Computational and Functional Study
Authors: Iannotti Fabio Arturo , De Maio Fabrizia , Panza Elisabetta , Appendino Giovanni , Taglialatela-Scafati Orazio , De Petrocellis Luciano , Amodeo Pietro , Vitale Rosa Maria
Published: March 2020

Phytocannabinoids (pCBs) are a large family of meroterpenoids isolated from the plant Cannabis sativa. Δ9-Tetrahydrocannabinol (THC) and cannabidiol (CBD) are the best investigated phytocannabinoids due to their relative abundance and interesting bioactivity profiles. In addition to various targets, THC and CBD are also well-known agonists of peroxisome proliferator-activated receptor gamma (PPARγ), a nuclear receptor involved in energy homeostasis and lipid metabolism. In the search of new pCBs potentially acting as PPARγ agonists, we identified cannabimovone (CBM), a structurally unique abeo-menthane pCB, as a novel PPARγ modulator via a combined computational and experimental approach. The ability of CBM to act as dual PPARγ/α agonist was also evaluated. Computational studies suggested a different binding mode toward the two isoforms, with the compound able to recapitulate the pattern of H-bonds of a canonical agonist only in the case of PPARγ. Luciferase assays confirmed the computational results, showing a selective activation of PPARγ by CBM in the low micromolar range. CBM promoted the expression of PPARγ target genes regulating the adipocyte differentiation and prevented palmitate-induced insulin signaling impairment. Altogether, these results candidate CBM as a novel bioactive compound potentially useful for the treatment of insulin resistance-related disorders.
Unbalanced Sphingolipid Metabolism and Its Implications for the Pathogenesis of Psoriasis
Authors: Bocheńska Katarzyna , Gabig-Cimińska Magdalena
Published: March 2020

Sphingolipids (SLs), which have structural and biological responsibilities in the human epidermis, are importantly involved in the maintenance of the skin barrier and regulate cellular processes, such as the proliferation, differentiation and apoptosis of keratinocytes (KCs). As many dermatologic diseases, including psoriasis (PsO), intricately characterized by perturbations in these cellular processes, are associated with altered composition and unbalanced metabolism of epidermal SLs, more education to precisely determine the role of SLs, especially in the pathogenesis of skin disorders, is needed. PsO is caused by a complex interplay between skin barrier disruption, immune dysregulation, host genetics and environmental triggers. The contribution of particular cellular compartments and organelles in SL metabolism, a process related to dysfunction of lysosomes in PsO, seems to have a significant impact on lysosomal signalling linked to a modulation of the immune-mediated inflammation accompanying this dermatosis and is not fully understood. It is also worth noting that a prominent skin disorder, such as PsO, has diminished levels of the main epidermal SL ceramide (Cer), reflecting altered SL metabolism, that may contribute not only to pathogenesis but also to disease severity and/or progression. This review provides a brief synopsis of the implications of SLs in PsO, aims to elucidate the roles of these molecules in complex cellular processes deregulated in diseased skin tissue and highlights the need for increased research in the field. The significance of SLs as structural and signalling molecules and their actions in inflammation, in which these components are factors responsible for vascular endothelium abnormalities in the development of PsO, are discussed.
A Supramolecular Approach to Structure-Based Design with A Focus on Synthons Hierarchy in Ornithine-Derived Ligands: Review, Synthesis, Experimental and in Silico Studies
Authors: Bojarska Joanna , Remko Milan , Breza Martin , Madura Izabela D. , Kaczmarek Krzysztof , Zabrocki Janusz , Wolf Wojciech M.
Published: March 2020

The success of innovative drugs depends on an interdisciplinary and holistic approach to their design and development. The supramolecular architecture of living systems is controlled by non-covalent interactions to a very large extent. The latter are prone to extensive cooperation and like a virtuoso play a symphony of life. Thus, the design of effective ligands should be based on thorough knowledge on the interactions at either a molecular or high topological level. In this work, we emphasize the importance of supramolecular structure and ligand-based design keeping the potential of supramolecular H-bonding synthons in focus. In this respect, the relevance of supramolecular chemistry for advanced therapies is appreciated and undisputable. It has developed tools, such as Hirshfeld surface analysis, using a huge data on supramolecular interactions in over one million structures which are deposited in the Cambridge Structure Database (CSD). In particular, molecular interaction surfaces are useful for identification of macromolecular active sites followed by in silico docking experiments. Ornithine-derived compounds are a new, promising class of multi-targeting ligands for innovative therapeutics and cosmeceuticals. In this work, we present the synthesis together with the molecular and supramolecular structure of a novel ornithine derivative, namely N-α,N-δ)-dibenzoyl-(α)-hydroxymethylornithine, 1. It was investigated by modern experimental and in silico methods in detail. The incorporation of an aromatic system into the ornithine core induces stacking interactions, which are vital in biological processes. In particular, rare C=O…π intercontacts have been identified in 1. Supramolecular interactions were analyzed in all structures of ornithine derivatives deposited in the CSD. The influence of substituent was assessed by the Hirshfeld surface analysis. It revealed that the crystal packing is stabilized mainly by H…O, O…H, C…H, Cl (Br, F)…H and O…O interactions. Additionally, π…π, C-H…π and N-O…π interactions were also observed. All relevant H-bond energies were calculated using the Lippincott and Schroeder H-bond model. A library of synthons is provided. In addition, the large synthons (Long-Range Synthon Aufbau Module) were considered. The DFT optimization either in vacuo or in solutio yields very similar molecular species. The major difference with the relevant crystal structure was related to the conformation of terminal benzoyl C15-C20 ring. Furthermore, in silico prediction of the extensive physicochemical ADME profile (absorption, distribution, metabolism and excretion) related to the drug-likeness and medicinal chemistry friendliness revealed that a novel ornithine derivative 1 has the potential to be a new drug candidate. It has shown good in silico absorption and very low toxicity.