bluuebunny/crossref_metadata_2025_split huggingface dataset:
Analisis Interferensi White Space Device terhadap Sistem Radio Navigasi Penerbangan pada Frekuensi 960 MHz
Authors: SARI LYDIA , ALAM SYAH , SURJATI INDRA 
Published: May 2019

ABSTRAKPemerintah Indonesia mengalokasikan spektrum frekuensi 960-1164 MHZ untuk sistem komunikasi bergerak maupun untuk radio navigasi penerbangan. Penggunaan White Space Device (WSD) merupakan solusi keterbatasan spektrum, karena mampu mengidentifikasi dan memanfaatkan frekuensi yang tidak terpakai. Penelitian ini menyelidiki potensi interferensi yang terjadi pada koeksistensi sistem radio navigasi penerbangan serta perangkat WSD di pita 960 MHz. Penelitian menggunakan pendekatan matematis Minimum Coupling Loss (MCL) serta simulasi dengan Spectrum Engineering Advanced Monte Carlo Analysis Tool (SEAMCAT). Hasil penelitian menunjukkan bahwa level interferensi yang masih diperbolehkan berada di kisaran -81,589 dBm. Level ini tercapai dengan penggunaan jarak proteksi antar sistem sejauh 36 km. Penurunan daya pemancar WSD atau peningkatan gain RSBN sebesar 1 dBm dapat memperkecil jarak proteksi menjadi 30 km untuk mencapai probabilitas interferensi berturutturut 3,55% dan 3,6%.Kata kunci: white space devices, interferensi, radio navigasi penerbangan ABSTRACTThe Indonesian Government allocates the 960-1164 MHz spectrum for mobile communications and aeronautical radio navigation services. Cognitive radio is a technology which will enable the use of a limited spectrum optimally. Devices implemented with cognitive radio capability is referred as White Space Device (WSD) as they can identify and utilize idle channels. This paper investigates the interference potential between aeronautical radio navigation services and WSD as they co-exist in the 960 MHz spectrum using Minimum Coupling Loss (MCL) formulae and simulations using Spectrum Engineering Advanced Monte Carlo Analysis Tool (SEAMCAT). Results show that the permissible interference level is -81,589 dBm which is achievable if the two systems are separated by 36 km. Decreasing the WSD power level or increasing the RSBN gain by 1 dBm can decrease the protection distance between the two systems to 30 km to achieve an interference probability of 3,55% and 3,6%, respectively.Keywords: white space devices, interference, aeronautical radio navigation
Potensi Ekstrak Etanol Kulit Jeruk Lemon (Citrus limon L.) Sebagai Obat Alternatif Hiperkolesterolemia Pada Tikus Wistar Hiperglikemik
Authors: Hartanto Deni Tri , Kurniasari Ellen Lydia , Maria Ribka Artha , Dewi Puspa Sari , Septiani Vina 
Published: May 2019

<p align="center"><strong>Abstrak</strong></p><p align="center"><strong> </strong></p><p>Jeruk lemon (<em>Citrus limon </em>L) secara empiris telah digunakan masyarakat untuk menurunkan berat badan. Selain itu perasan jeruk lemon pun dipercaya mampu menurunkan kadar kolesterol darah. Penelitian ini bertujuan untuk menentukan potensi ekstrak etanol kulit jeruk lemon sebagai obat alternatif hiperkolesterolemia pada tikus <em>wistar</em> hiperglikemia dengan menggunakan metode proteksi. Proses ekstraksi kulit buah jeruk lemon dilakukan dengan metode maserasi. Semua tikus diberi sediaan uji sesuai dengan kelompoknya (kontrol, ekstrak etanol jeruk lemon, pembanding simvastatin) bersamaan dengan intervensi fruktosa 60% yang dicampur dalam makanannya selama 6 minggu. Pemeriksaan kadar kolesterol total dilakukan setiap minggu. Hasil pengujian menunjukkan bahwa ekstrak etanol kulit buah lemon mampu menghambat peningkatan kadar kolesterol total tikus <em>wistar </em>hiperglikemia. Ekstrak etanol kulit buah lemon dosis 70 mg/kg bb menunjukkan hasil terbaik yang berbeda bermakna dibanding kelompok kontrol (p&lt;0,05) pada penelitian ini. Dengan demikian, ekstrak etanol kulit jeruk lemon berpotensi untuk digunakan sebagai obat alternatif hiperkolesterolemia.</p><p> </p><p><strong>Kata Kunci :</strong> Hiperkolesterolemia, Lemon, Fruktosa 60%</p><p> </p><p align="center"><strong><em>Potency of lemon peel ethanolic extract (Citrus limon L.) as alternative drug for hypercholesterolemia in hyperglycemic wistar rat</em></strong></p><p><em> </em></p><p align="center"><strong><em>Abstract </em></strong></p><p align="center"><strong><em> </em></strong></p><p><em>Lemon (Citrus limon L) empirically has been used by the community to lose weight. Besides lemon juice is also believed to be able to reduce blood cholesterol levels. This study aims to determine the potential of ethanol extract of lemon peel as an alternative medicine for hypercholesterolemia in hyperglycemic wistar rats using the protection method. The process of extracting lemon peel is done by maceration method. All rats were given a test preparation according to their group (control, lemon ethanol extract, compared to simvastatin) together with intervention of fructose 60% mixed in the food for 6 weeks. Examination of total cholesterol levels is carried out every week. The test results showed that the ethanol extract of lemon peel was able to inhibit the increase of total cholesterol levels in hyperglycemic wistar rats. The ethanol extract of lemon peel doses of 70 mg / kg bw showed the best results which were significantly different than the control group (p &lt;0.05) in this study. Thus, the ethanol extract of lemon peel has the potential to be used as an alternative drug for hypercholesterolemia.</em></p><p><em> </em></p><p><strong><em>Keywords</em></strong><em> : Hypercholesterolemia, Lemon, Fructose 60 % </em></p>
PEMURNIAN ENZIM SEFALOSPORIN-C ASILASE DAN OPTIMASI PROSES KROMATOGRAFI PENUKAR ION
Authors: Nasution Uli Julia , Wijaya Silvia Melinda , Wibisana Ahmad , Safarrida Anna , Rachmawati Indra , Puspitasari Dian Japany , Naim Sidrotun , Mahsunah Anis Herliyanti , Wulyoadi Sasmito , Suyanto Suyanto 
Published: May 2019

Purification of Cephalosporin-C Acylase and Its Optimization of Ion-Exchange ChromatographyABSTRACTCephalosporin-C acylase (CCA) has an important role in the one-step conversion of cephalosporin-C into 7-ACA. Purification process aims to increase specific activity of CCA enzyme. Purification began with cell lysis, ammonium sulphate precipitation, dialysis, ion exchange chromatography (IEC) and size exclusion chromatography. IEC optimization of elution step was also done to compare gradient and isocratic elusion. Purification was capable to increase the enzyme purity upto 33.66 fold, with specific activity of 3.00 U/mg and the yield reached 41.41%. Optimization of elusion during IEC showed that isocratic protein elusion was more efficient (taking shorter time, 3 column volume (CV) only) than that of gradient batch (up to 9 CV). SDS-PAGE analysis demonstrated that the recombinant CCA enzyme existed in two types, active enzyme containing α-subunit (25 kDa) and β-subunit (58 kDa), and inactive enzyme (83 kDa) as precursor. Furthermore, 30% ammonium sulphate saturated precipitation was able to precipitate this inactive CCA.Keywords: 7-ACA,CCA, cephalosporin C, protein purification, specific activity ABSTRAKSefalosporin-C asilase (CCA) merupakan enzim yang berperan penting dalam konversi satu tahap sefalosporin-C menjadi 7-ACA. Proses purifikasi merupakan salah satu cara untuk meningkatkan aktivitas spesifik enzim CCA. Proses purifikasi dimulai dari memecah sel, diikuti dengan tahap presipitasi menggunakan amonium sulfat, dialisis, kromatografi penukar ion (IEC) dan kromatografi eksklusi. Optimasi proses IEC pada tahap elusi juga dilakukan untuk membandingkan elusi enzim CCA secara gradien dan isokratik. Proses purifikasi pada penelitian ini mampu meningkatkan kemurnian enzim hingga 33,66 kali, dengan aktivitas spesifik sebesar 3,00 U/mg dan perolehan enzim sebesar 41,41%. Hasil optimasi IEC pada proses elusi secara isokratik lebih efisien dari segi waktu (hanya membutuhkan 3 kolom volume (CV) dibandingkan dengan secara gradien (sampai 9 CV). Hasil SDS-PAGE menunjukkan bahwa CCA rekombinan merupakan enzim dengan 2 macam bentuk yaitu enzim aktif, yang terdiri dari subunit α (25 kDa) dan β (58 kDa), dan enzim tidak aktif berupa prekursor (83 kDa). Proses presipitasi menggunakan amonium sulfat 30% tersaturasi dapat mengendapkan prekursor CCA.Kata Kunci: 7-ACA, aktivitas spesifik, CCA, purifikasi protein, sefalosporin C
Pengaruh Model Pembelajaran Two Stay Two Stray (TSTS) Dipadukan dengan Metode Demonstrasi Terhadap Hasil Belajar Kimia
Authors: Sulistyanti Lilis , Siahaan Jeckson , Junaidi Eka 
Published: May 2019

Penelitian ini bertujuan untuk mengetahui mengetahui pengaruh model pembelajaran Two Stay-Two Stray (TSTS) dipadukan dengan metode demonstrasi terhadap hasil belajar kimia materi pokok laju reaksi pada siswa kelas XI MIA MAN 2 Mataram. Jenis penelitian ini merupakan quasi experimental dalam bentuk Post-test Only Control Group Design. Populasi dalam penelitian ini meliputi seluruh siswa kelas XI MIA MAN 2 Mataram. Teknik yang digunakan untuk pengambilan sampel yaitu dengan teknik simple random sampling. Sampel pada penelitian ini adalah kelas XI MIA 4 sebagai kelas eksperimen dan kelas XI MIA 2 sebagai kelas kontrol. Pada kelas eksperimen diberi perlakuan dengan menerapkan model pembelajaran Two Stay-Two Stray (TSTS) dipadukan dengan metode demonstrasi sedangkan pada kelas kontrol diberi perlakuan dengan menerapkan model pembelajaran konvensional. Uji hipotesis pada penelitian ini menggunakan uji-t. Hasil uji statistik diperoleh thitung = 5,009 > ttabel = 1,671 yang berarti H0 ditolak. Berdasarkan hasil tersebut maka dapat disimpulkan bahwa penerapan model pembelajaran Two Stay-Two Stray (TSTS) dipadukan dengan metode demonstrasi memberikan pengaruh yang lebih baik terhadap hasil belajar kimia materi pokok laju reaksi pada siswa kelas XI MIA MAN 2 Mataram.
Pengaruh Model Pembelajaran Conceptual Understanding Procedures (Cups) terhadap Hasil Belajar Kimia Materi Hidrokarbon Siswa Kelas XI IPA MAN Lombok Barat Tahun Pelajaran 2018/2019
Authors: Nauri Shofiatun , Laksmiwati Dwi , Muti’ah Muti’ah 
Published: May 2019

Penelitian inibertujuan untuk mengetahui pengaruh model pembelajaran Conceptual Understanding Procedures (CUPs) terhadap hasil belajar kimia materi hidrokarbon siswa kelas XIIPA MAN Lombok Barat. Jenis penelitian eksperimen yang digunakan adalah eksperimen semu (quasyexperiment) dengan rancangan pretest-posttest control group design. Populasi penelitian seluruh siswa kelasXI IPA MAN Lombok Barat yang terdiri dari dua kelas, dengan jumlah totalsiswa 53 orang. Teknik pengambilan sampel yang digunakan adalah sampling jenuh. Sampel pada penelitian ini adalah kelas XI IPA 1 sebagai kelas eksperimen dan kelas XI IPA 2 sebagai kelas kontrol. Pada kelas eksperimen diterapkan model pembelajaran Conceptual Understanding Procedures (CUPs) dan pada kelas kontrol diterapkan model pembelajaran konvensional. Uji hipotesis pada penelitian ini menggunakan uji-t. Hasil uji statistik diperoleh t-hitung=2,89>t-tabel =1,684 yang berarti Ha diterima. Berdasarkan hasil tersebut maka dapat disimpulkan bahwa penerapan model pembelajaran Conceptual Understanding Procedures (CUPs) memberikan pengaruh yang lebih baik pada hasil belajar kimia materi hidrokarbon siswa kelas XI IPA MAN Lombok Barat.
Pengembangan Profesionalissme Guru dalam Menulis Karya Ilmiah
Authors: Al Hadi Kasnawi , Qomariyah Nurul , Minardi Suhayat , Mardiana Laili , Alaidrus Alfina Taurida , Alaa’ Siti 
Published: May 2019

Abstract: Salah satu bentuk profesionalisme guru adalah memiliki kemampuan menulis artikel ilmiah. Guru SMP 2 Sekotong pada umumnya belum memiliki wawasan yang cukup tentang kepenulisan ilmiah sehingga guru mengalami kesulitan dalam meningkatkan kemampuan profesionalnya dalam bidang kepenulisan. Tujuan kegiatan pengabdian pada masyarakat ini adalah meningkatkan kompetensi guru dalam menulis karya ilmiah. Metode yang digunakan adalah pendekatan konstruktivisme, pelaksanaan kegiatan dibagi menjadi dua kali yaitu pertama pelaksanaan kegiatan dilakukan melailui pemberian materi di dalam kelas dengan metode ceramah kelas, diskusi, pemberian contoh dan latihan, dan selanjutnya peserta diberikan layanan bimbingan. Hasil yang diperoleh dari kegiatan ini adalah menambah pengetahuan dan wawasan yang cukup tentang hakikat penulisan artikel ilmiah, menambah keterampilan menulis karya tulis ilmiah berdasarkan sistematika dan bahasa ilmiah yang baik. Guru SMP 2 Sekotong yang mengikuti kegiatan pengabdian masyarakat sangat antusias mendapat pelatihan tentang teknik penulisan karya tulis ilmiah sebagai penunjang profesionalitasnya didunia pendidikan serta dapat menghasilkan produk artikel ilmiah yang layak diterbitkan di jurnal ilmiah. Keywords: Artikel ilmiah, guru, Konstruktivisme
Analysis of the Mamaia Bay shoreline Retreat with Hard and Soft Protection Works
Authors: Anton Catalin , Gasparotti Carmen , Anton Iulia Alina , Rusu Eugen 
Published: May 2019

Integrated Coastal Zone Management is a complex concept that involves various economic, social and environmental factors. There are often conflicting approaches to these factors. Furthermore, when it is decided to implement structural works in the coastal area, it must be taken into account the particularity of the area, the way in which it is developed and the type of work to be done. The Gulf of Mamaia in the Romanian Black Sea coast is the target of structural changes through the implementation of an extensive coastal rehabilitation program. The works made are of “hard” type and aim to change the shore line configuration. From this perspective, the target of the present paper is to make an analysis between the type of work that is being carried out and another kind of "soft" work aiming especially to favor the ecological reconstruction of the area and the approach of an environmentally friendly concept. Thus, we propose to analyze the two types of works with a view to apply the Bruun rule in order to mitigate the effect of the increase of the sea level and to prevent the shoreline retreat.
Pemeriksaan Ookista Toxoplasma gondii pada Kemangi (Ocimum basilicum) dan Kubis (Brassica oleracea, L.) di Pedagang Ayam dan Ikan Goreng/Panggang
Authors: Sulistyawati Dewi , Tantya Defa Perwira 
Published: May 2019

Masyarakat Surakarta banyak yang gemar kuliner. Jenis kuliner yang menjamur salah satunya adalah menu ayam dan ikan goreng/panggang dilengkapi lalapan. Kebiasaan mengkonsumsi lalapan yang kurang bersih merupakan salah satu resiko terinfeksi ookista Toxoplasma gondii. Salah satu jenis lalapan yang disajikan adalah kemangi dan kubis. Tujuan penelitian ini adalah untuk memeriksa adanya kontaminasi ookista Toxoplasma gondii pada kemangi dan kubis di penjual ayam & ikan goreng/panggang di Kecamatan Banjarsari, Kota Surakarta, Provinsi Jawa Tengah.
Penelitian ini termasuk penelitian observasional dengan pendekatan cross sectional. Sampel diambil dari 20 pedagang ayam dan ikan goreng/panggang di Kecamatan Banjarsari, Surakarta. Pemeriksaan ookista dilakukan dengan metode sedimentasi. Metode ini dipilih karena relatif mudah dan praktis. Dari hasil pemeriksaan diperoleh data bahwa dari 20 (dua puluh) sampel lalapan kemangi terdapat 1 sampel (5%) yang terkontaminasi ookista Toxoplasma gondii, sedangkan dari 20 sampel lalapan kubis tidak ada yang terkontaminasi ookista Toxoplasma gondii.
Kata kunci : Toxoplasma gondii, kemangi, kubis
Catastrophic Failure of a Fan in a Diesel Engine Cooler
Authors: Krishna B.V. , Sidhu R.K. 
Published: May 2019

Abstract
The fan used to cool a diesel engine fractured catastrophically after approximately 100 h of operation. The fan failed at a spider, which was resistance spot welded to a shim placed between two circular spiders of 3 mm thickness. The detailed analysis of the fracture indicated that the premature failure of the fan was due to inadequate bonding between the sheets at the weld nugget. The fracture was initiated from the nugget-plate interface. The inadequate penetration and lack of fusion between the steel sheets during resistance spot welding led to poor weld strength and the fracture during operation. The propensity to crack initiation and failure was accentuated by improper cleaning of the surfaces prior to welding and to inadequate nugget-to-sheet edge distance.
Failure Analysis of Door Lock Assemblies Illustrating the Statistical Aspects of Failure Analysis
Authors: Forgione J. 
Published: May 2019

Abstract
Statistical techniques provide the design engineer with a powerful tool for the analysis of failure data. By means of an actual case study, steps required to design a test yielding statistically meaningful data and procedures used in graphical analysis of results are presented. The Weibull distribution is the statistical model used as a basis for these techniques. This method of failure analysis provides the engineer with clear, positive design direction.
Cracking at a Superheater Header Connection
Authors: da Silveira T.L. , Le May I. 
Published: May 2019

Abstract
Examination of the header of the third superheater of a boiler producing 150 t/h of steam at 525 deg C and 118 kPa, disclosed extensive internal cracking at the connection to the tube joining this to a safety valve. Cracking was observed within the tube and in the thickness of the shell wall itself. The boiler had been in operation for approximately 160,000 h and was shut down for inspection when the cracking was detected. The material involved was 2.25 Cr, 1 Mo steel, and the unit had been subjected to 115 shutdowns. Initiation of the cracks was attributed to thermal shock, caused by the periodic return of condensate along the long connecting line (some 9 m long). Propagation of the cracks was due to thermal cycling, together with periodic pressure cycles, producing growth by low cycle fatigue. This was aided by corrosion within the cracks and by the wedging action caused by corrosion deposits at their tips. The failure suggests control of dissolved solids in the boiler feedwater may have been inadequate.
Analysis of Failed Nuclear Plant Components
Authors: Diercks D.R. 
Published: May 2019

Abstract
Argonne National Laboratory has conducted analyses of failed components from nuclear power-generating stations since 1974. The considerations involved in working with and analyzing radioactive components are reviewed here, and the decontamination of these components is discussed. Analyses of four failed components from nuclear plants are then described to illustrate the kinds of failures seen in service. The failures discussed are (1) intergranular stress-corrosion cracking of core spray injection piping in a boiling water reactor, (2) failure of canopy seal welds in adapter tube assemblies in the control rod drive head of a pressurized water reactor, (3) thermal fatigue of a recirculation pump shaft in a boiling water reactor, and (4) failure of pump seal wear rings by nickel leaching in a boiling water reactor.
Cracked Disks of Fan Made of Heat Resistant Steel
Authors: Naumann Friedrich Karl , Spies Ferdinand 
Published: May 2019

Abstract
Three radially-cracked disks that circulated the protective gases in a bell-type annealing furnace were examined. During service they had been heated in cycles of 48 h to 720 deg C for 3 h each time, then were kept at temperature for 15 h followed by cooling to 40 deg C in 30 h, while rotating at 1750 rpm. Two disks were cracked at the inner face of the sheet metal rim while the rim of the third was completely cracked through. An analysis of the sheet metal rim of one of the disks showed the following composition: 0.06C, 1.98Si, 25.8Cr, and 35.8Ni. A steel of such high chromium content was susceptible to s-phase formation when annealed under 800 deg C. The material selected was therefore unsuitable for the stress to be anticipated. In view of the required oxidation resistance, a chromium-silicon or chromium-aluminum steel with 6 or 13% Cr would have been adequate. If the high temperature strength of these steels proved inadequate, an alloy lower in chromium would have been preferable.
Arterial wall contrast enhancement in progressive moyamoya disease
Authors: Roder Constantin , Hauser Till-Karsten , Ernemann Ulrike , Tatagiba Marcos , Khan Nadia , Bender Benjamin 
Published: May 2019

OBJECTIVEThe purpose of this study was to evaluate chronological patterns of arterial wall contrast enhancement in contrast-enhanced high-resolution MRI (CE-HR-MRI) in patients with moyamoya disease (MMD).METHODSThe authors performed a blinded analysis of clinical and imaging data from MMD patients. Data were analyzed chronologically for each patient and the intensity of arterial wall enhancement was correlated with the clinical and imaging-based progression status of the disease.RESULTSA total of 31 MMD patients and 61 imaging time points were included. CE-HR-MRI results were available for 56 time points, representing 112 hemispheric analyses. No arterial wall contrast enhancement (grade 1) was seen in 54 (48%) of the analyses, mild enhancement (grade 2) in 24 (21%), moderate enhancement (grade 3) in 15 (13%), and strong (grade 4) mainly concentric arterial wall contrast enhancement in 19 (17%). Grade 4 contrast enhancement was significantly (p < 0.001) associated with clinical disease progression within 6 months (before or after the MRI) compared to grades 1–3, with positive and negative predictive values of 0.8 and 0.88, respectively. Grades 1 and 2 (no contrast enhancement and only mild contrast enhancement) were highly predictive for stable disease (negative predictive value: 0.95).CONCLUSIONSA specific chronological increasing and decreasing pattern of arterial wall contrast enhancement associated with “beginning” as well as progression of angiopathy occurs in MMD patients. In clinical practice, CE-HR-MRI of the arterial wall may help to identify patients at risk of new strokes caused by disease progression and hence impel early treatment for future stroke prevention. Understanding of this temporary enhancement of the arterial wall might also bring new insights into the etiology of MMD.
PENGARUH MODEL THINK PAIR AND SHARE BERBASIS MEDIA TREE CHART TERHADAP HASIL BELAJAR KOGNITIF PADA MATERI KEANEKARAGAMAN HAYATI
Authors: Queen Yolanda Ave , Supiandi Markus Iyus , Ege Benediktus 
Published: May 2019

Hasil belajar kognitif adalah salah satu dari tiga jenis hasil belajar yang diukur pada suatu proses pebelajaran. Hasil belajar kognitif siswa akan lebih baik apabila menerapkan berbagai model maupun media pembelajaran salah satunya adalah model pembelajaran Think, Pair and Share (TPS) berbasis media Tree Chart. Penelitian ini dilakukan untuk mengetahui pengaruh model TPS berbasis media Tree Chart terhadap hasil belajar kognitif siswa kelas X SMA Negeri 1 Silat Hulu pada materi Keanekaragaman Hayati. Pendekatan dalam penelitian ini berupa pendekatan kuantitatif dengan bentuk penelitian Quasi Eksperimental Design. Populasi pada penelitian ini adalah seluruh siswa di kelas X SMA Negeri 1 Silat Hulu terdiri dari 129 siswa. Teknik pengambilan sampel menggunakan teknik purposive sampling dengan total sampel 58 siswa, 29 siswa untuk kelas eksperimen dan 29 siswa untuk kelas kontrol. Teknik pengumpulan data menggunakan teknik pengukuran. Instrumen untuk mengukur hasil belajar kognitif siswa berupa soal pilihan ganda sebanyak 30 item. Berdasarkan uji hipotesis pada posttest kelas eksperimen dan kelas kontrol diperoleh nilai sig. (2–tailed) sebesar 0,00 dan α = 0,05. Pengujian hipotesis membuktikan bahwa nilai sig. (2–tailed) < α (0,002< 0,05) yang artinya Ho ditolak dan H1 diterima, yakni terdapat perbedaan hasil belajar kognitif siswa antara kelas eksperimen dan kelas kontrol pada pengukuran akhir posttest.