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MULTIPLICITY OF NEUTRALLY STABLE PERIODIC ORBITS WITH COEXISTENCE IN THE CHEMOSTAT SUBJECT TO PERIODIC REMOVAL RATE
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| Pengarang | : | - |
| Nama Majalah/Jurnal | : | Siam Journal On Applied Mathematics |
| Volume / Edisi | : | 84 (No. 1) |
| Halaman | : | 39-59 |
| Abstrak | : | We identify a taxonomic property on the growth functions in the multispecies chemo stat model which ensures the coexistence of a subset of species under periodic removal rate. We show that proportions of some powers of the species densities are periodic functions, leading to an infinity of distinct neutrally stable periodic orbits depending on the initial condition. This condition on the species for neutral stability possesses the feature to be independent of the shape of the periodic signal for a given mean value. We also give conditions allowing the coexistence of two distinct subsets of species. Although these conditions are nongeneric, we show in simulations that when these conditions are only approximately satisfied, the behavior of the solutions is close to that of the nongeneric case over a long time interval, justifying the interest of our study. |
A Simple and Cost-Effective Fluid Dynamics Apparatus to Engage Students in the Classroom and Laboratory
| Pengarang | : | - |
| Nama Majalah/Jurnal | : | The Physics Teacher |
| Volume / Edisi | : | 62 (No. 5) |
| Halaman | : | 330-334 |
| Abstrak | : | Fluid mechanics is a subject commonly encountered in undergraduate- to graduate-level classes. The most common method of communicating the physics dictating the behavior of fluids is by reference to classroom slides or board examples and formal presentation of formulae and relationships. Conducting practical fluid dynamics experiments either as live demonstrations or as a hands-on student laboratory experiment presents a number of difficulties such as working with large amounts of liquid in the setting of a standard classroom or physics laboratory. |
Suku Kenyah di Desa Budaya Pampang, Kalimantan: studi kasus perubahan sosial budaya masyarakat Kenyah tahun 1972-2015
| Pengarang | : | Fransiskus Hendy Tri Harsanto, Silverio Raden Lilik Aji Sampurno |
| Nama Majalah/Jurnal | : | Bandar Maulana |
| Volume / Edisi | : | 24 (No. 1) |
| Halaman | : | 47-61 |
| Abstrak | : | Suku Kenyah adalah salah satu suku di Kalimantan. Sejarah penting dari orang-orang Kenyah ialah proses migrasi yang sudah dilakukan sejak lama. Sekitar tahun 1700 mereka bermigrasi ke Apo Kayan. Migrasi kedua terjadi tahun 1960-an saat banyak masyarakat Kenyah di Apo Kayan menginginkan akses yang mudah terhadap kebutuhan pokok dan fasilitas publik. Salah satu tempat untuk berpindah ialah Pampang di wilayah administratif Kota Samarinda. Masyarakat Kenyah di Pampang mengalami perubahan sosial budaya terutama sejak Pampang menjadi desa budaya pada 1991. Menggunakan teori perubahan sosial yang menunjuk pada modifikasi sosial (Samuel Koenig), penelitian historis ini menganalisis perubahan sosial budaya di suku Kenyah di Pampang tahun 1971-2015. Pasca Pampang ditetapkan menjadi daerah pariwisata, terjadi pergeseran sosial dan budaya pada masyarakat Kenyah. Keterlibatan masyarakat dalam kesenian meningkat, namun juga terjadi perubahan gaya hidup dari yang bersifat komuniter menjadi individual. Di samping itu, kebudayaan lokal, misalnya kerajinan dan tari-tarian, kini menjadi komoditas ekonomi. |
BADAN USAHA MILIK NEGARA DALAM ERA GLOBALISASI DAN LIBERALISASI
| Pengarang | : | - |
| Nama Majalah/Jurnal | : | Bina Darma |
| Volume / Edisi | : | 13-48 (No. 48) |
| Halaman | : | 6-12 |
| Abstrak | : | - |
Strategies for Supporting Equitable Group Work
| Pengarang | : | - |
| Nama Majalah/Jurnal | : | The Physics Teacher |
| Volume / Edisi | : | 62 (No. 5) |
| Halaman | : | 326-329 |
| Abstrak | : | Science is a collaborative activity, making group work an important element of many science classrooms.1 However, group work is also frequently a source of inequity, especially when there is minimal structure.2 The ways students interact during group work are shaped by status, which students assign based on factors including perceived ability, race, gender, economic status, and even perceived social savvy.3,4 The choices that we make as teachers about when, why, and how students work in groups, how and what students learn about working in groups, and even the composition of those groups has the potential to disrupt—or perpetuate—social power dynamics, ideologies, and hierarchies that shape status. In this article, we will share some strategies for structuring and facilitating group work that disrupt status and promote equitable participation. |
COMBINED FIELD-ONLY BOUNDARY INTEGRAL EQUATIONS FOR PEC ELECTROMAGNETIC SCATTERING PROBLEM IN SPHERICAL GEOMETRIES
| Pengarang | : | Maltez-Faria, Luiz,Perez-Arancibia, Carlos,Turc, Catalin |
| Nama Majalah/Jurnal | : | Siam Journal On Applied Mathematics |
| Volume / Edisi | : | 84 (No. 1) |
| Halaman | : | 19-38 |
| Abstrak | : | Weanalyze the well-posedness of certain field-only boundary integral equations (BIEs) for frequency domain electromagnetic scattering from perfectly conducting spheres. Starting from the observations that (1) the three components of the scattered electric field E\mathrm{s}\mathrm{c}\mathrm{a}\mathrm{t}(x) and (2) scalar quantity E\mathrm{s}\mathrm{c}\mathrm{a}\mathrm{t}(x) \cdot x are radiative solutions of the Helmholtz equation, we see that novel boundary integral equation formulations of electromagnetic scattering from perfectly conducting obstacles can be derived using Green's identities applied to the aforementioned quantities and the boundary condi tions on the surface of the scatterer. The unknowns of these formulations are the normal derivatives of the three components of the scattered electric field and the normal component of the scattered electric field on the surface of the scatterer, and thus these formulations are referred to as field-only BIEs. In this paper we use the combined field methodology of Burton and Miller within the field only BIE approach, and we derive new boundary integral formulations that feature only Helmholtz boundary integral operators, which we subsequently show to be well posed for all positive frequen cies in the case of spherical scatterers. Relying on the spectral properties of Helmholtz boundary integral operators in spherical geometries, we show that the combined field-only boundary integral operators are diagonalizable in the case of spherical geometries and their eigenvalues are nonzero for all frequencies. Furthermore, we show that for spherical geometries one of the field-only integral formulations considered in this paper exhibits eigenvalues clustering at one-a property similar to second-kind integral equations |
ONE-DIMENSIONAL SHORT-RANGE NEAREST-NEIGHBOR INTERACTION AND ITS NONLINEAR DIFFUSION LIMIT
| Pengarang | : | - |
| Nama Majalah/Jurnal | : | Siam Journal On Applied Mathematics |
| Volume / Edisi | : | 84 (No. 1) |
| Halaman | : | 1-18 |
| Abstrak | : | Repulsion between individuals within a finite radius is encountered in numerous applications, including cell exclusion, i.e., avoidance of overlapping cells, bird flocks, or microscopic pedestrian models. We define such individual-based particle dynamics in one spatial dimension with minimal assumptions of the repulsion force f as well as their external velocity v and prove their characteristic properties. Moreover, we are able to perform a rigorous limit from the microscopic to the macroscopic scale, where we could recover the finite interaction radius as a density threshold. Specific choices for the repulsion force f lead to well-known nonlinear diffusion equations on the macroscopic scale, as, e.g., the porous medium equation. At both scaling levels, numerical simulations are presented and compared to underline the analytical results. |
Kajian sejarah kampung di persimpangan jalan: menuju demokratisasi sejarah
| Pengarang | : | Limyana,Joko Santoso, Alb. ,Ernawati |
| Nama Majalah/Jurnal | : | Bandar Maulana |
| Volume / Edisi | : | 24 (No. 1) |
| Halaman | : | 38-46 |
| Abstrak | : | Dalam dunia historiografi Indonesia, kita sukar mencari kampung sebagai aspek spasial dalam topik kajian para sejarawan. Sekalipun belakangan pengkajian sejarah di Indonesia bergerak dari sejarah makro yang didasarkan pada tradisi pendekatan ilmu-ilmu sosial menjadi sejarah mikro yang bersandar pada pengalaman kehidupan sehari-hari orang kebanyakan, tetapi tetap saja studi sejarah kampung belum disasar. Jika mau jujur, yang tergarap rata-rata sejarah perkotaan dan sejarah pedesaan. Bahkan, aliran postmodern dan postkolonial yang kini banyak diikuti sejarawan juga belum sepenuhnya menerobos lokus yang paling mini. Mereka cenderung berdebat perihal wacana baru dan perspektif yang membebaskan. Pertanyaan yang perlu disodorkan adalah dimana kedudukan sejarah kampung dalam pustaka historiografi Indonesia. Apakah sejarah kampung tidak layak dihadirkan karena selain dianggap tidak menarik, juga dinilai relatif sedikit sumbangannya terhadap pembentukan kesadaran berbangsa dan pembangunan Indonesia. Tulisan ini hendak menjawab beberapa pertanyaan tersebut. |
Komunitas Tritunggal Mahakudus Sebuah Pembaharuan Di Dalam Gereja Katolik
| Pengarang | : | Martin us J oko Lelono |
| Nama Majalah/Jurnal | : | Bandar Maulana |
| Volume / Edisi | : | 24 (No. 1) |
| Halaman | : | 25-37 |
| Abstrak | : | Tulisan ini membahas sejaralz sem batik, k/iususnya simbol pada pola-pola batik tulis Keraton Yogyakarta pada masa Sultan Hmnengkubuwana VIII (1921-1939). Pada tahun 1927 Sultan Hmnengkubuwana VIII menerbitkan lembar kernjaan (rijksblaad) Pranatan Dalem Bab Jenenge Panganggo Keprabon Ing Kera ton Nagari Yogyakarta yang mengatur pemakaian pola-pola batik tertentu untuk keluarga Kernton Yogyakarta. Batik adalalz artefak penting dari Keraton Yogyakarta yang memiliki simbol dan menjelaskan kedudukan pemakai serta rnakna di baliknya. Tujuan tulisan ini adalah mengkaji pola-pola batik tulis Kernton Yogyakarta dengan simbol yang melekat. Metodologi dalam penulisan ini adalah deskriptif narntif, memakai pendekatan sejara/z. Pola-pola pada batik kernton dengan simbol tersebut kerap terjadi konflik dengan penguasa kolonial Belanda, nmnun di bawah kepemimpinan Sultan Hmnengkubuwana VIII, berhasil didudukkan. sebagai benda budaya yang semakin detail, ke dalam, dan memperkokoh Kernton Yogyakarta. |
Monitoring the super-rich : the effects of Indonesia’s tax office on high-wealth individuals
| Pengarang | : | - |
| Nama Majalah/Jurnal | : | Bies: Bulletin of Indonesian Economic Studies |
| Volume / Edisi | : | 61 (No. 1) |
| Halaman | : | 61-122 |
| Abstrak | : | I study the effects of monitoring high-wealth individuals (HWIs) on tax compliance and revenue. I exploit quasi-experimental variation generated by the implementation of a special tax office for HWIs in 2009, which monitored Jakarta residents with gross assets of more than Rp 100 billion (around $10 million). I compare the reported income and income taxes of HWIs administered by the HWI office and HWIs administered by ordinary tax offices before (2007–08) and after (2010–14) the HWI policy was in effect. I find that the reported income and the income taxes of HWIs administered by the HWI office decreased by 43.9% and 40.5%, respectively, over six years relative to those of HWIs administered by ordinary tax offices (Kantor Pelayanan Pajak Pratama). The results support the literature predicting that heightened tax scrutiny may lead HWIs to underreport income as a strategic response. |