Search

Population-based optimization algorithms are often used to resolve highly non-linear inverse problems by performing iterative and stochastic searches of the model space for solutions. These techniques rely on a combination of global and local searches associated with the exploration and exploitation capabilities, respectively. The iterative process usually converges to models very close to each other, leading to unrealistic solution's uncertainties extracted from the final population. In this paper, we are more interested in the model space exploration leading to more representative uncertainties of the solutions. We divide the search agents into two groups, each randomly distributed in the whole model space and in the vicinity of a promising solution or best model. The additional tuning parameter in the relatively new Generalized Neighborhood Algorithm (GNA) is quite simple to choose, i.e., the extent of search in the neighborhood of the best model. The method was tested to invert magnetotelluric (MT) synthetic data of various representative cases with good results, i.e., recovery of the synthetic models with response that fits the synthetic data. Application of GNA to field data showed that the subsurface resistivity distribution agrees well with the geology of the study area.

Abstract Law enforcement practices in the military environment are still not in line with sectoral egos. Law enforcement has not been able to guarantee substantive order, truth and justice. When carrying out law enforcement in the military environment, it should not only refer to normative legal rules, but what needs to be done more is to make legal breakthroughs that are more effective and efficient. The discipline of a soldier is an absolute thing that is inseparable from his duty to maintain the security of the Unitary State of the Republic of Indonesia. This study analyzes contemporary forms of threats related to security and resilience and explains the similarities and differences in national resilience studies which aim to realize a national security system and develop national security systems in other countries. This research is normative juridical research, using a statutory approach, conceptual approach, and analytical techniques in the form of grammatical interpretation and systematic interpretation. This research explains that the forms of threats that occur in Indonesia include problems at the border, intolerance between ethnicities and between governments and religions, inequality in bureaucratic reform, inadequate law enforcement, and transnational crime. This research shows that national resilience and security are influenced by the professionalism of the Indonesian National Army. The safe conditions of a country cannot be separated from just security and defense but are in synergy with other factors, namely economics, politics, law, socio-culture, ideology, geography, demography and resources

Lampung merupakan salah satu provinsi di Indonesia yang telah menjadi sentra produksi ternak sapi. Kondisi ini merupakan alternatif penyedia pupuk organic berupa pupuk kandang sapi (pupuk kandang sapi) yang berpotensi untuk meningkatkan pertumbuhan dan produksi ubikayu. Oleh karena itu, tujuan penelitian ini adalah untuk mengevaluasi pertumbuhan dan produksi dua klon ubikayu., mengevaluasi pertunbuhan dan poriduksi akibat pemberian pupuk kandang sapi dan mengevaluasi pertumbuhan dan produksi klon akibat aplikasi pupuk kandang. Penelitian ini dilaksanakan di Desa Sidodadi, Kecamatan Way Lima, Kabupaten Pesawaran, Propinsi Lampung mulai Februari hingga Desember 2020. Perlakuan disusun secara factorial (2x2) dalam rancangan acak kelompok lengkap (RAKL) dengan dua ulangan yang digunakan sebagai kelompok. Factor pertama adalah dua klon ubikayu, UJ3 dan/UJ5, selanjutnya factor kedua adalah dua dosis pupuk kandang sapi, 0 ton/ha dan 20 ton/ha. Variable yang diamati adalah tinggi tanaman (TT), diameter batang (DB), jumlah daun total (JDT), jumlah daun hijau (JDH), bobot kering daun (BKD), bobot kering batang (BKB), jumlah akar (JA), bobot ubi segar (BUB), bobot ubi kering (BUK). Hasil menunjukkan bahwa pada aplikasi pupuk kandang sapi 20 ton/ha, JTD UJ3 cenderung lebih tinggi dibanding UJ5 namun BKD UJ3 lebih rendah dibanding UJ5. BBU dan BKU UJ3 cenderung lebih tinggi dibanding yang UJ5 pada aplikasi 20 ton pupuk kandang sapi/ha. Hal ini berarti bahwa UJ3 ukuran batang 5% lebih besar dibanding UJ5 akibat pupuk kandang sapi melalui distribusi bahan kering dari daun ke bagian akar, sehingga produksi UJ3 lebih tinggi 10% lebih tinggi.

The Implementation of wheeled robot technology in the development of transportation vehicles makes them capable for operating automatically. In order to operate automatically, a vehicle requires stable control system which including motion kinematic algorithm where is developed in a robotic system. With the aim of being able to build an Unmanned Grounded Vehicle (UGV), in this study an UGV prototype was made in the form of a wheeled robot with Differential Drive Mobile Robot (DDMR) system. The robot is controlled by motion kinematic control algorithm and a trajectory tracking system that is used to get an estimate of the position caused by the robot’s movement, beside it made the robot can operate automatically. To support the performance of the control system, the robot prototype is added with a compass sensor which used as the wheel odometry sensor’s support. The process of combining wheel odometry and compass sensor data is carried out by using the sensor fusion algorithm, where the limit value for the RMS error for the position accuracy is not more than 0.15 meters. As the result of the trials, by adding a compass sensor and implementing sensor fusion algorithm is able to reduce the average RMS (Root Mean Square) error value of the motion accuracy into below 0.15 meters which previously worth 0.392 meters decreased into 0.075 meters.

RADIONUKLIDA CESIUM SEBAGAI INDIKATOR PENENTUAN BURNUP BAHAN BAKAR U3Si2/Al SECARA MERUSAK. Penentuan burn-up secara merusak dilakukan dengan metode pemisahan 137Cs dalam PEB U3Si2/Al densitas 4,8 gU/cm3 pasca iradiasi.Penentuan burn-up secara merusak bertujuan untuk membuktikan kesesuaian besar burn-up yang diperoleh dengan metode tak merusak maupun menggunakan Origen Code. PEB U3Si2/Al dengan kode CBBJ 251 dipotong pada bagian top, middle dan bottom secara duplo dengan berat masing-masing Top-1= 0,049 gPEB dan Top-2=0,058 gPEB, Middle-1= 0,055 gPEB dan Middle-2= 0,024 gPEB, serta Bottom-1= 0,056 gPEB dan Bottom-2=0,075gPEB. PEB U3Si2/Al dengan berat tersebut dilarutkan menggunakan asam sehingga diperoleh larutan bahan bakar U3Si2/Al yang mengandung hasil fisi 134Cs, 137Cs, 235U dan isotop lainnya. Larutan bahan bakar U3Si2/Al dipipet 1mL kemudian ditransfer dari hotcell ke R.135 untuk dilakukan pemisahan 137Cs dari 235U dengan metode penukar kation menggunakan zeolit Lampung. Larutan bahan bakar U3Si2/Al dipipet 100 µL dan dimasukkan ke dalam vial secara duplo kemudian ditambahkan zeolit Lampung 1000 mg untuk dilakukan proses penukar kation.Hasil pemisahan diperoleh isotop 137Cs dalam fasa padat, sedangkan uranium dan isotop lainnya dalam fasa cair. Besarnya aktivitas (Bq) isotop 137Cs diukur dengan Spektrometer-g dan selanjutnya digunakan untuk perhitungan burn-up. Hasil perhitungan burn-up PEB U3Si2/Al densitas 4,8 gU/cm3 dengan metode merusak diperoleh sebesar 26,9714%; 55,1431%; dan 37,8855% masing-masing untuk potongan top, middle dan bottom dengan burn-up rerata 40%. Besaran ini tidak jauh berbeda dengan burn-up yang diperoleh dengan metode tak merusak menggunakan gamma scanning yaitu sebesar 24,4%; 52,7% ; 37,6 % masing-masing untuk potongan top, middle dan bottom dengan burn-up rerata 38,23% serta dengan burn up yang dihitung menggunakan Origen code yaitu sebesar 40%. Kata kunci : Metode merusak, pemisahan, cesium, burn-up

Abstract The moral teachings and philosophy of life of the Javanese have a very deep meaning which leads to happiness. This paper aims to provide up-to-date knowledge about the meaning of Ethics, Behavior, and Character of Memayu Hayuning Bawono, Ambrasto dur Hangkoro in accounting profession education in Java, based on Javanese philosophy. This study uses a qualitative method approach, ethnography. The results of this study conclude that ethics, behavior, and character in accounting profession education based on Javanese philosophy are more bars, ruruh, wantah, duga prayoga, nastiti and do not focus on ardana. The character of "dhakah" in him slowly disappeared because the formed "warok" had reached "Wiloka". This finding provides a new aspect for the curriculum development of accounting education programs, so that graduates (accountants) can better understand and interpret the philosophy of human life from the point of view of Javanese philosophy. Keywords: Ethics; Behavior; Accountant profession education character. Abstrak Ajaran moral dan filosofi hidup orang Jawa memiliki makna yang sangat mendalam yang mengarah kepada kebahagiaan. Tulisan ini bertujuan untuk memberikan keterbaruan pengetahuan tentang makna Etika, Perilaku, dan Karakter Memayu Hayuning Bawono, Ambrasto dur Hangkoro pada pendidikan profesi akuntan di Jawa, berdasarkan filsafat Jawa. Penelitian ini menggunakan pendekatan metode kualitatif, etnografi. Hasil penelitian ini menyimpulkan bahwa etika, perilaku, dan karakter pada pendidikan profesi akuntan berlandaskan filsafat Jawa lebih bars, ruruh,wantah,duga prayoga,nastitidan tidak berfokus pada ardana. Karakter dhakah dalam dirinya perlahan sirna karena warok yang terbentuk telah mencapai Wiloka. Temuan ini memberikan aspek baru bagi pengembangan kurikulum program pendidikan akuntansi, agar lulusannya (akuntan) lebih dapat mengerti dan memaknai filosofi hidup manusia dari sudut pandang filsafat Jawa. Kata kunci: Etika; Perilaku; Karakter pendidikan profesi akuntan.

PERILAKU TARIK DAN STRUKTUR MIKRO BAJA TAHAN KARAT AISI 304 PASCA PERLAKUAN PANAS PADA DAERAH SENSITISASI 600 – 700 °C. Baja tahan karat AISI 304 digunakan sebagai komponen struktur reaktor daya tipe LWR. Dalam pembuatan komponen struktur, kualitas sambungan lasan SS 304 ditentukan oleh proses pendinginan dari temperatur austenit ke sensitisasi. Tujuan penelitian adalah mengetahui karakter kekuatan tarik, kekerasan dan struktur mikro SS 304 pada daerah sensitisasi 600-700 °C. Metoda penelitian yang digunakan adalah pengujian komposisi kimia, tarik, kekerasan, dan struktur mikro yang mengacu pada ASTM. Hasil penelitian menunjukkan bahwa kekuatan tarik SS 304 pasca perlakuan sensitisasi pada (600 °C, 30- 60 menit) dan (700 °C, 30-90 menit) relatif sama dan lebih rendah dibandingkan tanpa perlakuan panas, sedangkan pada (600 °C, 90 menit) relatif sama dengan sampel tanpa perlakuan panas. Struktur mikro SS 304 terdiri atas fasa ferit-d dan austenit serta presipitat khrom karbida. Kuantitas presipitat di batas butir menurun dengan bertambahnya temperatur dan waktu penahanan. Kekerasan pasca perlakuan sensitisasi pada 600 - 700°C relatif sama di base metal, dekat patahan dan daerah patahan. Ketangguhan retak terbaik diperoleh pada sampel SS 304 dengan perlakuan (700 °C, 90 menit). Kata kunci: baja tahan karat, sensitisasi, kekuatan tarik, kekerasan, struktur mikro, presipitat.

Hipokalemi merupakan kondisi dimana kadar kalium serum < 3,5 mmol/L. Hipokalemia akut paska bedah jantung sering terjadi akibat kehilangan urin, dan pergeseran intraseluler serta akibat hemodilusi setelah CPB (Cardiopulmonary bypass). Hipokalemia dapat memprovokasi terjadinya aritmia melalui perubahan pada sifat elektrofisiologi miosit jantung, termasuk peningkatan fase depolarisasi. Mempertahankan kadar kalium serum 4,5 mmol/L setelah operasi jantung dapat mengurangi terjadinya aitmia. Artikel ini merupakan studi kasus yang menggambarkan managemen keperawatan pada hipokalemia paska operasi CABG hari ke nol. Setelah dilakukan intervensi keperawatan berupa mempertahankan keseimbangan elektrolit (kalium) dalam range normal pasien tidak mengalami aritmia. Penerapan intervensi keperawatan managemen keseimbangan elektrolit (kalium) dapat mencegah terjadinya aritmia paska bedah CABG dan dapat meningkan outcomes pasien.

Magnetic method in geophysical surveys is common for its non-destructive use of sub-surface structure delineation. In this study, ground-based measurements of magnetic intensity were performed using a set of instruments in some regions of Pacitan, a city in the southern area of East Java province. Based on these measurements, data acquisition was used to identify the Grindulu faulting zone in the region of interest, potentially vulnerable to geohazards. The data were first corrected using the IGRF and diurnal corrections. A filtering technique of upward continuation at a height of 900 m was then applied to separate local anomalies from regional ones as the targeted sources in the present case. These separate anomalies and their corresponding reductions to the poles as further filtering processes were analyzed for predicting the location and direction of the fault. The results, extracted from data analysis and interpretation, show that the main path of the Grindulu is directed along the NE-SW fault line or N60oE. The resulting anomalies also reflect that the Grindulu is a normal fault with surrounding minor faults lying across the Grindulu, calling for increased awareness of vulnerability in the city to seismic threats.

The Molucca Sea Plate, and Sangihe and Halmahera plates have a complex tectonic setting and interact to create the Molucca Sea Collision Zone. We re-picked 1647 events recorded from 2010 to 2017 from 32 of The Agency for Meteorology, Climatology, and Geophysics (BMKG) stations and obtained P- and S-arrivals of ~17,628 phases. Hypocenter locations were determined using the software NonLinLoc. Then, we performed a travel time tomography in order to image the subsurface and approximate the Molucca Sea Plate subduction angle beneath Sulawesi’s north arm, the relationship subduction zone and volcanic activity in Halmahera, and depth comparison of the Molucca Sea Plate. Our results show that (i) high Vp, high Vs, and low Vp/Vs are associated with the Molucca Sea Plate beneath Sulawesi’s north arm, and the approximate subduction angle is ~40°. (ii) Low Vp, low Vs, and high Vp/Vs beneath the northern and southern Halmahera Volcanic Arc are associated with a possible magma source. Volcanoes in the north have experienced eruptions and are dormant in the south. This group of volcanoes is connected by partial melting above the Molucca Sea Plate subducts to the east. (iii) High Vp, high Vs, and low Vp/Vs are interpreted as double subduction of the Molucca Sea Plate. It is submerged deeper in the north compared with the south, which is nearer to the surface.

FinTech innovations are one of strategic decisions to increase the profitability of a company. This study determines the level of profitability of companies before and after the emergence of FinTech products. The authors focused on companies that have launched FinTech products and published their financial reports. The study sample consisted of 17 FinTech products from 16 companies in Indonesia. The limited number of the sample was caused by not all of them having published its financial reports, while we have checked 157 FinTech companies. An event study approach using paired sample T-test is utilized. The period used in this study is four years, covering two years before and two years after the company launched FinTech products. Data were obtained from IDX, FinTech.id, and company web-pages. The results clearly showed that there was a significant influence on return on assets (ROA), but no significant difference in return on equity (ROE). This finding gives more contribution to the FinTech industry about the company’s profitability impact of launching FinTech product.

This paper tried to prove the capability of a geophysical method, called VLF (very low frequency) for peat thickness variability exploration. The method involved using the VLF receiver to measure the VLF properties emitted by the ground from the study area. The study was carried out in Jambi Province of Indonesia in three different depths of peat area, i.e.; very deep (8-15 m), deep (3-8 m) and shallow (0-3 m) peat. The depth was confirmed by direct measurement. The VLF measurement was done along transects on each areas. The data was processed using NAMEMD (Noise Assisted Multivariate Empirical Mode Decomposition) method and converted into value and depth of resistivity using Inv2DVLF software. The study indicated that the resistivity, shows significant difference (F(2,6317) = 4.525, p = 0.011) between the area of very deep peat and the shallow peat. The resistivity varies according to peat thickness. In the very deep area, it tends to be statistically similar until 7.32 meter depth and starts to differ significantly at the depth of 11.46 meters. In turn, in the area of deep peat, it is statistically similar until 4.72 meter and starts to show differences at 7.32 m depth. However, in shallow area, it does not exhibit the differences as in the area of deep peat. This proved that the VLF method works properly in deep and very deep peat and is capable of indicating the peat thickness.

PENGARUH ARAH PENGEROLAN DAN SHEAR CUTTING TERHADAP KARAKTER PADUAN AlMg2 SEBAGAI MATERIAL CLADDING BAHAN BAKAR REAKTOR RISET. Proses pengerolan paduan AlMg2 dilakukan secara bertahap hingga diperoleh ketebalan tertentu dengan syarat perilaku mekanik akhir sesuai spesifikasi cladding bahan bakar reaktor riset. Pada pengujian tarik elemen bakar pasca iradiasi digunakan spesimen mini untuk meminimalkan limbah radioaktif. Tujuan penelitian adalah mendapatkan pengaruh arah pengerolan dan shear cutting terhadap karakter paduan AlMg2. Metode yang digunakan adalah pengujian tarik, metalografi dan kekerasan pada sampel pasca pengerolan dan spesimen mini paduan AlMg2. Hasil penelitian menunjukkan bahwa paduan AlMg2 searah pengerolan mempunyai kekuatan tarik dan kekerasan lebih rendah dan lebih ulet dibandingkan arah melintang pengerolan. Struktur paduan AlMg2 pasca pengerolan panas terdiri atas fasa a(Al) dan presipitat yang terdistribusi di sepanjang butir batang pipih searah pengerolan sampel. Shear cutting mempengaruhi lebar dan kekerasan daerah deformasi pada permukaan bekas potong spesimen mini. Kata kunci: arah pengerolan, shear cutting, paduan AlMg2, kekuatan tarik, kekerasan, mikrostruktur.

Penelitian ini bertujuan untuk meningkatkan interaktivitas pembelajaran melalui penggunaan komunikasi asynchronous di Universitas Negeri Yogyakarta. Penelitian tindakan kelas ini dilaksanakan dalam dua siklus. Subjek penelitian ini adalah 32 orang mahasiswa Program Studi Teknologi Pendidikan UNY, yang menempuh mata kuliah Pengembangan E-learning Berbasis Web pada tahun ajaran 2015/2016. Data dikumpulkan menggunakan teknik wawancara, check list, dan dokumentasi, serta dianalisis secara deskriptif melalui teknik persentase. Hasil penelitian menunjukkan bahwa meningkatkan interaktivitas pembelajaran melalui penggunaan komukasi asynchronous pada mata kuliah pengembangan e-learning berbasis web di Prodi TP UNY dilakukan melalui 4 hal bahwa komunikasi asynchronous: (1) diterapkan secara konsisten pada mata kuliah e-Learning Berbasis Web, (2) digunakan menancap (embed) pada e-LearningUNY (Besmart), (3) dimanfaatan untuk menyelesaiakn tugas yang memerlukan kolaborasi, dan (4) menggunakan tipe yang berfariasi. Interaktivitas pembelajaran mahasiswa sebelum diterapkan komunikasi asynchronous berada di kategori sangat rendah dengan persentase 35%. Terjadi peningkatan interaktivitas pembelajaran mahasiswa setelah diterapkan komunikasi asynchronous di siklus pertama pada kategori rendah dengan persentase 60%, dan kembali meningkat di siklus kedua pada kategori sangat tinggi dengan persentase 82,33%.Kata kunci: interaktivitas pembelajaran, komunikasi asynchronous IMPROVING LEARNING INTERACTIVITY BY IMPLEMENTING ASYNCHRONOUS COMMUNICATION IN YOGYAKARTA STATE UNIVERSITY Abstract This research aims to improve learning interactivity by asynchronous communication in web based e-learning development course. This study used a classroom action research (CAR) which is conducted in two cycles. The subjects were 32 students of Curriculum and Educational Technology Department Yogyakarat State University (YSU) who participated in the web based e-learning development course in academic year 2015/2016. The data were collected using percentage method by interview, check list and documentation. The result shows that, improving instructional interactivity by asynchronous communication in web based e-learning development course were conducted using four strategies, i.e: 1) asynchronous communication applied consistently on Web-based e-Learning courses, 2) embedding on e-Learning of Yogyakarta State University (Besmart), 3) utilized for completion of tasks that require collaboration, and 4) using a varied type of asynchronous mode. Learning interactivity was reach 35 % in a very low category before asynchronous communication were implemented. The result shows in the 1st cycle, instructional interactivity rose up to 60% in a low category. In the 2nd cycle, it provides dramatically improvement up to 82,33% in very high category. Keywords: instructional interactivity, asynchronous communication