Type-II topological phase transitions of topological skyrmion phases

We present minimal toy models for topological skyrmion phases of matter, which generically realize type-II topological phase transitions in effectively non-interacting systems, those which occur without closing of the minimum direct bulk energy gap. We study the bulk-boundary correspondence in detail to show that a non-trivial skyrmion number yields a rich bulk-boundary correspondence. We observe gapless edge states, which are robust against disorder, due to non-trivial skyrmion number. Edge states corresponds to bands, which do not traverse the bulk gap, instead yielding gaplessness due to their overlap in energy and exponential localization on opposite edges of the system. These gapless boundary modes can occur for total Chern number zero, and furthermore correspond to rich real-space spin textures with strong polarization of spin along the real-space edge. By introducing toy models generically exhibiting type-II topological phase transitions and characterizing the bulk-boundary correspondence due to non-trivial skyrmion number in these models, we lay the groundwork for understanding consequences of the quantum skyrmion Hall effect.Comment: 6 pages + 4 figures main text, 12 pages + 15 figures supplementary material

KONVERSI BAHAN BAKAR CAIR DARI LIMBAH PLASTIK STYROFOAM DITINJAU DARI PENGARUH TEMPERATUR TERHADAP PRODUK YANG DI HASILKAN

Peran utama minyak sebagai energi utama belum tergantikan, makaperlu dilakukan konservasi dan diversifikasi energi alternatif pengganti minyak. Di sisi lain, permasalahan sampah juga menjadi salah satu masalah yang muncul di masyarakat, teurtama Kota Palembang. Sampah yang dihasilkan di Kota Palembang sebesar 750 ton/hari dengan 17,05% merupakan sampah plastik. Pengolahan sampah plastik menjadi bahan bakar telah banyak dilakukan namun perkembangannya masih sangat lambandan kualitas produk yang dihasilkan belum seragam sehingga kurang diminati olehmasyarakat.Oleh karena itu diperlukan suatu inovasi untuk mengkonversi sampah plastik menjadi bahan bakar cair yang mampu dikomersilkan di masyarakat terutama masyarakat pengguna roda dua ataupun mesin 4 tak.MetodeyangdigunakanadalahpirolisisdenganmemanfaatkanbahanbakuplastikjenisStyrofoamuntuk dikonversimenjadibahanbakarcair yang siapdikomersilkan, dengan menggunakan bahan bakaroli bekas sehingga dapat menghemat penggunaan energi dan meningkatkan kualitas produk. Pengamatan yang dilakukanadalahdenganmelihatpengaruhvariasiwaktu proses selama 10 menit, 20 menit, 30 menit, 40 menit, 50 menitterhadaphasil proses pirolisis yang bertujuanuntukuntukmendapatkanwaktu optimal proses

Studi komparatif hisab gerhana bulan dalam kitab al-Durr al-Anīq dengan astronomical algorithm Jean Meeus versi Rinto Anugraha

Hisab gerhana bulan dilakukan untuk mengetahui kapan terjadinya gerhana bulan dengan maksud melaksanakan ibadah sunnah bagi umat islam yaitu salat gerhana. Hisab gerhana bulan dalam kajian ilmu falak diklasifikasikan dalam beberapa metode, banyak algoritma yang digunakan dalam menghitung hisab gerhana bulan, diantaranya kitab Al-Durr Al-Anīq dan Astronomical Algorithm Jean Meeus. Kitab Al-Durr Al-Anīq yang menggunakan pengantar bahasa arab yang biasanya digunakan di pesantren sedangkan Astronomical Algorithm Jean Meeus yang sudah banyak pakar astronomi mengutip dan menggunakannya, keduanya sama-sama memiliki tingkat keakurasian yang tinggi. Hal ini membuat rasa keingintahuan untuk menganalisis hasil komparasi hisab gerhana bulan antara kitab Al-Durr Al-Anīq dengan Astronomical Algorithm Jean Meeus. Dari latar belakang yang telah dijelaskan, skripsi ini mengambil dua rumusan masalah. Pertama, bagaimana hisab gerhana bulan yang diterapkan kitab Al-Durr Al-Anīq dan Astronomical Algorithm Jean Meeus. Kedua, bagaimana komparasi hisab gerhana bulan dalam kitab Al-Durr Al-Anīq dan Astronomical Algorithm Jean Meeus. Penelitian ini merupakan jenis penelitian kualitatif, yang menggunakan kajian penelitian kepustakaan (library research) dengan mengumpulkan data-data, selanjutnya data tersebut dianalisis menggunakan analisis komparatif melalui teknik diskriptif. Dalam menganalisis hasil penulis menggunakan Eclipse Predictions oleh NASA (National Aeronautics and Space Administration) sebagai parameter. Adapun hasil dari penelitian ini menemukan bahwa dalam algoritma hisab gerhana bulan di kitab Al-Durr Al-Anīq dan Astronomical Algorithm Jean meeus ada perbedaan yaitu dalam pengambilan data yang digunakan dan proses perhitungannya. Kemudian kitab Al-Durr Al-Anīq dan Astronomical Algorithm Jean Meeus sama-sama menghasilkan hasil akurasi yang baik, hal ini dibuktikan dengan parameter hasil perhitungan NASA hasilnya mendekati dengan hasil NASA. Hasil komparasi dari hisab gerhana bulan antara kitab Al-Durr Al-Anīq dan Astronomical Algorithm Jean Meeus hanya berkisar pada menit sampai detik

Pengukuran Tingkat Motilitas Sperma Berdasarkan Linearitas Sperma Menggunakan Metode Adaptive Local Threshold Dan Ellipse Detection

Technology that can be used toassist sperm examination is Computer-Aided Sperm Analysis (CASA). The problems with this technology are expensive and the methods are not open for public. A lot of researches have been done to have an altenative CASA's method to examine sperm quality accurately, inexpensively, and fast. This research is focused on measuring the level of sperm motility. Visual observations of sperm motility greatly depend on each andrologists which are subjective and also the possibility of repetition for the examined sample does not exist. Moreover, visual observation cannot provide precise values for parameters that affect the sperm motion patterns which are Velocity Straight Line, Velocity Curvilinear Line, and Linearity. Focus of this research is to create an application using sperm detection method, Local Adaptive Threshold and Ellipse Detection to measure sperm linearity to determine the level of sperm motility based on the WHO standard. Experiment produces result with the smallest difference 5.7333% and the biggest difference 10.4667% compared to the result of visual analysis by andrologist

SIMULASI STATIK DAN DINAMIK PARKING BUMPER REDESAIN MENGGUNAKAN SOFTWARE ANSYS 12.0

Penelitian yang telah dilakukan terhadap desain parking bumper memperlihatkan bahwa desain terbaik berbentuk trapesium padat [2]. Namun dalam pengujian yang dilakukan [5] memperlihatkan bahwa desain trapesium padat masih memiliki kelemahan yaitu tidak mampu menahan kecepatan mobil diatas 20 km/jam saat menuju parkir. Bila kecepatan mobil saat parkir lebih tinggi maka akan menyebabkan parking bumper mengalami kerusakan. Oleh sebab itu perlu dilakukan modifikasi desain (redesain) untuk mendapatkan bentuk desain yang lebih maksimal. Tujuan dari penelitian ini adalah melakukan pemodelan berupa redesain parking bumper dengan geometri trapesium sama sisi yang memiliki dimensi panjang 250 mm, lebar 200 mm, dan tinggi 130 mm. Selanjutnya meneliti hasil pengujian statik dan dinamik pada salah satu sisi miring melalui simulasi menggunakan program Ansys 12.0 Workbench sehingga diperoleh tegangan, regangan dan total deformasi. Berdasarkan uji statik ditentukan modulus elastisitas maksimum redesain parking bumper dan berdasarkan uji dinamik ditentukan gaya impak maksimum yang sanggup diterima parking bumper sesaat sebelum mengalami kerusakan. Terakhir membandingkan hasil penelitian yang dilakukan dengan penelitian sebelumnya [5]. Hasil pengujian statik dan dinamik pada salah satu sisi miring redesain parking bumper melalui simulasi menggunakan program Ansys 12.0 Workbench diperoleh hasil sebagai berikut: (1). Telah berhasil dilakukan redesain parking bumper dengan geometri berupa trapesium berongga yang diisi dengan bahan beton (concrete) dengan sisi miring berbentuk radius, memiliki dimensi panjang 250 mm, lebar 200 mm dan tinggi 130 mm. (2). Hasil simulasi statik dengan tekanan sebesar 2500 MPa selama selang waktu 240 s (4 menit), diperoleh tegangan rata-rata 6.909,9 Mpa, tegangan maksimum 8.884,2 MPa, regangan rata-rata 0.62812 m/m, regangan maksimum 0,80765 m/m, total deformasi rata-rata 0,034563 m, total deformasi maksimum 0,044438 m, dan modulus elastisitas maksimum 11.000 MPa. (3). Hasil simulasi dinamik dengan kecepatan jatuh bebas sebesar 10 m/s yang setara dengan 36 km/jam, diperoleh tegangan dinamik rata-rata 18,957 Mpa, tegangan maksimum 34,122 MPa, regangan impak rata-rata 0,00063424 m/m, regangan maksimum 0,0011416 m/m,total deformasi rata-rata 0,0030385 m, total deformasi maksimum 0,0054693 m dan gaya impak maksimum adalah 34.820 kN. (4). Dari hasil penelitian di atas dapat disimpulkan bahwa redesain parking bumper berupa trapesium berongga yang diisi concrete dengan sisi miring radius mempunyai karakteristik yang lebih baik dibandingkan dengan hasil penelitian sebelumnya berupa parking bumper berbentuk traperium padat [5]

Heuristic-based approaches for (CP)-nets in negotiation

CP-Nets have proven to be an effective representation for capturing preferences. However, their use in multiagent negotiation is not straightforward. The main reason for this is that CP-Nets capture partial ordering of preferences, whereas negotiating agents are required to compare any two outcomes based on the request and offers. This makes it necessary for agents to generate total orders from their CP-Nets. We have previously proposed a heuristic to generate total orders from a given CP-Net. This paper proposes another heuristic based on Borda count, applies it in negotiation, and compares its performance with the previous heuristic

Turkish EFL Teacher Candidates’ Early Teacher Identity

The topic of teacher identity has lately begun to be associated with general notions of teacher training and development. Becoming an expert through gradual learning and teaching also calls for awareness of self-identity as a teacher when considering the standards of the teaching profession. Language teachers start to develop their identity as a teacher during their higher education at language teaching departments, and the development in concern constitutes the basis of their roles in the teaching process. With that in mind, the current study was motivated to investigate perceptions of Turkish EFL teacher candidates on their early teacher identity. The participants of the study were senior students enrolled in two English Language Teaching Departments at a state university and a private university in Turkey. Data were collected from the students in concern through a Likert-type questionnaire during their teaching practicum. The research findings indicated that they held a high level of early teacher identity scores, and that they somehow significantly differed in their perceptions about early teacher identity with regard to gender and the attended university type

Stabilizing role of platelet P2Y(12) receptors in shear-dependent thrombus formation on ruptured plaques

Background: In most models of experimental thrombosis, healthy blood vessels are damaged. This results in the formation of a platelet thrombus that is stabilized by ADP signaling via P2Y(12) receptors. However, such models do not predict involvement of P2Y(12) in the clinically relevant situation of thrombosis upon rupture of atherosclerotic plaques. We investigated the role of P2Y(12) in thrombus formation on (collagen-containing) atherosclerotic plaques in vitro and in vivo, by using a novel mouse model of atherothrombosis. Methodology: Plaques in the carotid arteries from Apoe(-/-) mice were acutely ruptured by ultrasound treatment, and the thrombotic process was monitored via intravital fluorescence microscopy. Thrombus formation in vitro was assessed in mouse and human blood perfused over collagen or plaque material under variable conditions of shear rate and coagulation. Effects of two reversible P2Y(12) blockers, ticagrelor (AZD6140) and cangrelor (AR-C69931MX), were investigated. Principal Findings: Acute plaque rupture by ultrasound treatment provoked rapid formation of non-occlusive thrombi, which were smaller in size and unstable in the presence of P2Y(12) blockers. In vitro, when mouse or human blood was perfused over collagen or atherosclerotic plaque material, blockage or deficiency of P2Y(12) reduced the thrombi and increased embolization events. These P2Y(12) effects were present at shear rates >500 s(-1), and they persisted in the presence of coagulation. P2Y(12)-dependent thrombus stabilization was accompanied by increased fibrin(ogen) binding. Conclusions/Significance: Platelet P2Y(12) receptors play a crucial role in the stabilization of thrombi formed on atherosclerotic plaques. This P2Y(12) function is restricted to high shear flow conditions, and is preserved in the presence of coagulation

PENGARUH JUMLAH KATALIS DAN TEMPERATUR PADA PROSES PEMBUATAN BAHAN BAKAR CAIR LIMBAH STYROFOAM DENGAN METODE CATALYTIC CRACKING

Styrofoam is a thermoplastic polymer that cannot be biodegradable. Styrofoam waste is generally treated using burning method which produce a dangerous gases. Cracking is the right method to solve the problem by converting styrofoam waste into liquid fuel. In this study, the cracking process was carried out by catalytic cracking method using zeolit alam, SiO2.Al2O3 dan ϒ-Al2O3 as a catalyst. The aims of this study are to determine the effect of the number of catalyst and temperature variation on the percentage of yield, physical properties and compound content of liquid fuel. Variabels varied are the number of catalyst 5-25% from total reactants and temperatur variation 300-550 oC. The result shows, the highest %yield using zeolit alam is 77,7846% at 20% catalyst, for silica alumina with variations of temperature showed the highest % yield in the temperature 450oC is 79,09% and for ϒ-Al2O3 with variations of temperature showed the highest % yield in the temperature 500oC is 68,20

Extraction of the Composition of Olive Pits with Various Solvents

We have studied samples obtained from olive pits of different dimensions, determined the method for obtaining powder from olive pits, and also studied the best suitable time for collection. Crushed to a powder of powder and to particles of hard bones, they were placed in test tubes and filled with solvents. The solutions obtained by extraction with several solvents from the crushed powder of olive pits, collected in October 2021 in the Surakhani district of Baku, showed the best result. The resulting concentrates were studied and the optical density of the solutions was determined by UV spectroscopy; a method based on the Lambert–Bouguer–Beeroscopy law was applied