20 research outputs found
Stabilization Benchmark for Electroquasistatic Formulations
No full textThis repository contains code to obtain results from paper:
D. Balian, M. Merkel, J. Ostrowski, H. De Gersem, S. Schöps, "Low-Frequency Stabilization of Dielectric Simulation Problems with Conductors and Insulators", 2023. DOI: 10.48550/arXiv.2302.0031
Stabilization Benchmark for Electroquasistatic Formulations
No full textThis repository contains code to obtain results from paper:
D. Balian, M. Merkel, J. Ostrowski, H. De Gersem, S. Schöps, "Low-Frequency Stabilization of Dielectric Simulation Problems with Conductors and Insulators", 2023. DOI: 10.48550/arXiv.2302.0031
Heisenberg modules and Balian–Low theorems - Applications of operator algebras to Gabor analysis
No full textThe main way to study a periodic signal is to decompose it into a sum of simple signals, namely sine waves. However, when a signal changes substantially over time, such as a piece of music, different methods are needed. One method is to use Gabor frames. A Gabor frame represents a given signal in a way that emphasizes the signal’s frequency content at each point in time. For instance, a Gabor frame will represent an audio signal analogously to how sheet music is written.
Constructing good Gabor frames is not an easy task, and this problem has connections to many other areas in mathematics. In my dissertation, I have connected this problem to an area called operator algebras. A basic theorem about Gabor frames is the Balian-Low theorem, which is rooted in the uncertainty principle from quantum mechanics. I have shown that this theorem has a conceptual interpretation in operator algebras. Moreover, one can generally talk about Gabor frames in an abstract setting, namely in the context of an abelian topological group. I have completely classified the groups to which the Balian-Low theorem extends. One of the groups to which it extends is the rational adele group from number theory
Gift from the gods: a Balinese guide to early child rearing
No full textbook chapterThe influence of Western schools and other imports notwithstanding, many child-rearing practices recorded earlier in the century [in Indonesia] are still observable, especially those concerning infants and young children. For the "manual" that follows, I propose as the fictive author a male healer, or balian, who is trained in traditional Balinese healing arts to cure diseases of both physical and spiritual origins
Disrupting Racism through Re-envisioned Teacher Training
No full text[ABSTRACT ONLY; NO FULL TEXT] Peter Elbow foresees seismic shifts on the horizon in the culture of literacy that promise to empower teachers and students to embrace a variety of vernacular spoken languages in the quest for good writing. Although Elbow's prediction that "a single language for what's valid for serious writing" (363) is soon to be an archaic notion, other scholars like Walt Wolfram and Tore Janson argue that educational and social forces render language standardization an inevitable reality. The design of this project is first to historicize the racial and linguistic trauma that thrives in America's education system. The author then references and applies John U. Ogbu's cultural-ecological theory to depict the lasting effects of trauma on historically marginalized students. Next, the author suggests trauma-informed pedagogical approaches currently absent from pre-service teacher training programs that will prime new teachers to stamp out linguistic profiling and racial injustice within English Language Arts classrooms. Ultimately, this project demonstrates the need for a nationally uniform re-envisioned pre-service teacher training program that supports teachers and students impacted by racially-driven traumatic stress. This work of scholarship demonstrates that eradicating a single standard of literacy is welcome news at a time when a resurgence of white nationalism threatens to increase racism inside American schools
Central Visual Field Assessment in Late Stage Glaucoma
No full textI hereby declare that I am the sole author of this thesis. This is a true copy of the thesis, including any required final revisions, as accepted by my examiners. I understand that my thesis may be made electronically available to the public. ii Glaucoma is defined as a progressive optic neuropathy, characterized by loss of visual function and often associated with high intra-ocular pressure. Testing the patients ’ visual function with Standard Automated Perimetry (SAP) is currently the clinical standard for detecting glaucomatous visual field loss. A new test algorithm using the Frequency Doubling illusion has been introduced on the Matrix perimeter (Humphrey Matrix; Carl Zeiss Meditech, Dublin CA) that measures the central 10 ˚ using a 2˚x 2 ˚ square flickering stimulus. This stimulus has the theoretical advantage of being both a large target, with good repeatability, and being perceptually selective, by preferentially stimulating the magnocellular projecting ganglion cells. The purpose of this thesis was to determine the within-technique, between-visits repeatability and the within-visit, between-technique comparison of several techniques available to measure th
Smooth lattice orbits of nilpotent groups and strict comparison of projections
No full textThis paper provides sufficient density conditions for the existence of smooth
vectors generating a frame or Riesz sequence in the lattice orbit of a
square-integrable projective representation of a nilpotent Lie group. The
conditions involve the product of lattice co-volume and formal dimension, and
complement Balian-Low type theorems for the non-existence of smooth frames and
Riesz sequences at the critical density. The proof hinges on a connection
between smooth lattice orbits and generators for an explicitly constructed
finitely generated Hilbert -module. An important ingredient in the
approach is that twisted group -algebras associated to finitely generated
nilpotent groups have finite decomposition rank, hence finite nuclear
dimension, which allows us to deduce that any matrix algebra over such a simple
-algebra has strict comparison of projections.Comment: 36 page
Analysis of the Economic Life of Pan Mixer Machines and Spinning Machines at PT. Wijaya Karya Beton North Sumatra
No full text58 HalamanPT. WIJAYA KARYA adalah salah satu perusahaan badan usaha milik
negara ( BUMN ) yang bergerak dalam bidang usaha industri , realty, perdagangan
dan konstruksi. Dalam operasionalnya PT. WIJA YA KARY A membagi unit-unit
usaha kedalam divisi-divisi dan anak perusahaan. Salah satu anak perusahaan dari
PT. WIJAYA KARYA adalah PT. WIJAYA KARYA BETON yang bergerak dalam
industri produk beton. Produk-produk yang dihasilkan berupa tiang pancang, tiang
listrik, bantalan jalan rel (BJR) dan komponen beton pracetak lainnya.
PT. WIJAYA KARYA BETON mempunyai beberapa• lokasi pabrik yang
tersebar dibeberapa propinsi di Indonesia. Salah satu pabrik tersebut berada di jalan
medan-binjai km 15,5 Sumatera Utara. Dipilihnya lokasi pabrik tersebut karena
tempatnya yang strategis berada dijalur jalan lintas Sumatera dan dekat dengan
sumber material dan kantor pemasaran. Produk-produk yang sudah dihasilkan oleh
Pabrik Produk Beton Sumatera Utara adalah tiang pancang, tiang listrik, bantalan
jalan rel , bantalan jalan rolly dan beam jembatan untuk pemasaran didaerah medan,
Aceh, Riau bahkan sudah ada yang diekspor ke Malaysia.
Dalam beroperasinya pabrik tersebut mempergunakan beberapa jenis alat
yang terdiri dari peralatan utama dan peralatan pendukung. Peralatan utama adalah
peralatan yang dominan untuk proses produksi dan kalau tidak ada a.lat tersebut maka
proses produksi tidak dapat dilaksanakan. Dalam skripsi ini penulis akan membahas
umur ekonomis dari 2 jenis peralan utama yaitu, mesin pan mixer sebagai alat untuk membuat adukan beton dan mesm spmnmg sebagai alat untuk memutar cetakan
untuk produksi tiang pancang dan tiang listrik.
Dalam operasinya kedua mesin tersebut membutuhkan biaya yang dibagi
menjadi biaya operasional dan biaya penyusutan. Kedua factor biaya tersebut akan
mempengaruhi apakah peralatan tersebut cukup ekonomis untuk dioperasikan atau
tidak. Umur dimana peralatan tersebut masih ekonomis untuk dipergunakan disebut
dengan umur ekonomis. Dalam tugas akhir ini umur ekonomis dihitung berdasarkan
total biaya tahunan terkecil.
Dari hasil perhitungan tersebut diketahui bahwa Mesin Pan Mixer mempunyai
umur ekonomis 5 ( lima ) tahun dengan total biaya tahunan terkecil sebesar Rp.
74.994.525,56 dan Mesin Spinning Mempunyai umur ekonomis 5 ( lima ) tahun
dengan total biaya tahunan terkecil Rp. 56.305.158,89.
Umur ekonomis ini penting diketahui oleh mana1emen perusahaan agar
mana1emen perusahaan dapat mengambil keputusan apakah peralatan akan terus
dioperasikan atau mengganti peralatan tersebut dengan peralatan yang baru ataupun
mencari alternatif-alternatif yang lain. PT. WIJAYA KARYA is one of the company owned business entities
state (BUMN) which operates in the business sectors of industry, realty, trade
and construction. In its operations PT. WIJA YA KARY A divides the units
business into divisions and subsidiaries. One of the subsidiaries of
PT. WIJAYA KARYA is PT. WIJAYA KARYA CONCRETE which moves deep
concrete products industry. The products produced are piles and poles
electricity, railway sleepers (BJR) and other precast concrete components.
PT. WIJAYA KARYA BETON has several factory locations
spread across several provinces in Indonesia. One such factory is on the road
Medan-Binjai km 15.5 North Sumatra. The factory location was chosen because
The strategic location is on the Sumatra route and close to
material sources and marketing offices. Products that have been produced by
North Sumatra Concrete Products Factory is piles, electric poles, bearings
railways, roll bearings and bridge beams for marketing in terrain areas,
Aceh, Riau have even been exported to Malaysia.
In operating the factory, several types of equipment are used
which consists of main equipment and supporting equipment. The main equipment is
dominant equipment for the production process and if there is no such equipment then
the production process cannot be implemented. In this thesis the author will discuss
The economic life of the 2 main types of equipment, namely, a pan mixer machine as a tool for making concrete mix and a spmnmg machine as a tool for rotating molds.
for the production of piles and electricity poles.
In operation, the two machines require shared costs
into operational costs and depreciation costs. These two cost factors will
affects whether the equipment is economical to operate or not
No. The age at which the equipment is still economical to use is called
with economic life. In this final project the economic life is calculated based on
smallest total annual costs.
From the results of these calculations it is known that the Pan Mixer Machine has
economic life of 5 (five) years with the smallest total annual cost of Rp.
74,994,525.56 and Spinning Machines have an economic life of 5 (five) years
with the lowest total annual costs of Rp. 56,305,158.89.
This economic age is important for company management to know
Company management can take the decision whether the equipment will continue
operated or replaced the equipment with new equipment or
look for other alternative
Translation and evaluation of the Latin anonymous Libellus de Expugnatione Terrae Sanctae per Saladinum
No full textBu çalışmada Türkçeye tercüme edilen ve ayrıntılı bir değerlendirmesi yapılan Haçlı kaynağı, Haçlı seferlerindeki en önemli Müslüman figür olan Selâhaddin Eyyubi'nin Kudüs'ü fethinin tarihsel sürecini konu edinmektedir. İç anlaşmazlıklarla zayıflayan Kudüs Haçlı Krallığı 4 Temmuz 1187'de Hıttin Muharebesinde yenilgiye uğratılmıştı. Kral Guy de Lusignan da dahil olmak üzere birçok asil esir alınmıştı. Eylül ortasına kadar Selâhaddin Akka, Nablus, Yafa, Sidon, Beyrut ve Askalan'ı ele geçirmiş ve istikametini Kudüs'e çevirmişti. Selâhaddin 20 Eylül 1187'de büyük bir orduyla Kudüs önlerine gelerek ordugâh kurmuş ve böylelikle kuşatma başlamıştı. Askeri üstünlüğü elinde bulunduran Selâhaddin, Balian d'Ibelin'in kenti teslim etmesiyle Kutsal Topraklardaki Müslüman davasını yeniden canlandırmıştı. Libellus de Expugnatione Terrae Sanctae per Saladinum, Selâhaddin Eyyubi'nin Kudüs seferini doğrudan ve ayrıntılı olarak anlatan önemli bir kaynak eserdir. Libellus'un yazarının kimliği hakkında çeşitli fikirler ortaya atılmışsa da kim olduğu netlik kazanmamıştır.In this study, the Crusader source, which was translated into Turkish and evaluated in detail, is about the historical process of the conquest of Jerusalem by Saladin, the most important Muslim figure in the Crusades,. The Crusader Kingdom of Jerusalem, weakened by internal conflicts, was defeated in the Battle of Hattin on July 4, 1187. Many noble captives were taken, including King Guy de Lusignan. Until mid-September, Saladin had captured Akka, Nablus, Jaffa, Sidon, Beirut and Askalan and turned his direction to Jerusalem. Saladin came to Jerusalem with a large army on September 20, 1187 and established a encampment and thus the siege began. Selahaddin, who had the military superiority, revived the Muslim cause in the Holy Land when Balian d'Ibelin surrendered the city. Libellus de Expugnatione Terrae Sanctae per Saladinum is an important source text that directly and in detail describes the Jerusalem expedition of Saladin. Although various opinions were made about the identity of the author, who was the witness to the events, it was not clear who he was
Bibliometric study of seafood quality literature
No full textThis study investigates characteristics of seafood quality literature through application of bibliometric techniques. No previous studies that examined this field of science. The objectives are to examine seafood literature’s growth, document types, place/language of publishing, and author productivity patterns (analysed using Lotka’s law). A total of 2267 records were retrieved (up to 11 May 2016) from Web of Science and Scopus. Literature grew exponentially from 2000 to 2013 following the development of this field. Values obtained were c = 1.038, g = 1.118 and R2 = 0.946. Annual growth rate was 11.8%. The bibliography duplicates every 6.2 years. The most common publications were journal articles (64%), as expected. Per country, the U.S.A. made most major contributions, and English was the most-used language. A total of 5,583 authors, including co-authors, were retrieved; every paper’s author was given one credit to measure productivity. The majority (75%; 4175 authors) contributed only one article. These data do not fit Lotka’s law
