Geometric cumulants associated with adiabatic cycles crossing degeneracy points: Application to finite size scaling of metal-insulator transitions in crystalline electronic systems

In this work we focus on two questions. One, we complement the machinary to calculate geometric phases along adiabatic cycles as follows. The geometric phase is a line integral along an adiabatic cycle, and if the cycle encircles a degeneracy point, the phase becomes non-trivial. If the cycle crosses the degeneracy point the phase diverges. We construct quantities which are well-defined when the path crosses the degeneracy point. We do this by constructing a generalized Bargmann invariant, and noting that it can be interpreted as a cumulant generating function, with the geometric phase being the first cumulant. We show that particular ratios of cumulants remain finite for cycles crossing a set of isolated degeneracy points. The cumulant ratios take the form of the Binder cumulants known from the theory of finite size scaling in statistical mechanics (we name them geometric Binder cumulants). Two, we show that the machinery developed can be applied to perform finite size scaling in the context of the modern theory of polarization. The geometric Binder cumulants are size independent at gap closure points or regions with closed gap (Luttinger liquid). We demonstrate this by model calculations for a one-dimensional topological model, several two-dimensional models, and a one-dimensional correlated model. In the case of two dimensions we analyze to different situations, one in which the Fermi surface is one-dimensional (a line), and two cases in which it is zero dimensional (Dirac points). For the geometric Binder cumulants the gap closure points can be found by one dimensional scaling even in two dimensions. As a technical point we stress that only certain finite difference approximations for the cumulants are applicable, since not all approximation schemes are capable of extracting the size scaling information in the case of a closed gap system

Parallelizing heuristics for generating synchronizing sequences

Synchronizing sequences are used in the context of finite state machine based testing in order to initialize an implementation to a particular state. The cubic complexity of even the fastest heuristic algorithms known in the literature to construct a synchronizing sequence can be a problem in practice. In order to scale the performance of synchronizing heuristics, some algorithmic improvements together with a parallel implementation of these heuristics are proposed in this paper. An experimental study is also presented which shows that the improved/parallel implementation can yield a considerable speedup over the sequential implementation

CLIMATIC COMFORT FAVORABLE TOURISM AND RECREATION AREAS IN ARTVIN PROVINCE

Turkey is a big country of a varied topography and so it has many climatic zones. Tourism is one of the most important sector either at national or international level. On the other hand with its natural and cultural values, rich environmental sources and unique location linking the two continents, Turkey is an important country having the ability of supplying media for various types of tourism activity and alternative tourism approaches. In this frame, with their various climatic properties, Province of Artvin located in Blacksea Region is one of the main sources of recreation and tourism areas. Besides the touristic potential of the province, its natural specialties of landscape and climate are being a good source for scientific researches have had to be determined. In this study it was aimed that the most suitable areas for climatic comfort in Artvin Province were determined. Twelve different were chosen to define climatic variations. Average temperature, moister and wind speed values of these different climate stations were transferred into GIS environment by using Arc View 3.3 software. From the data transferred into GIS environment, climate maps created and most suitable areas for climatic comfort were determined

Clımatıc comfort favorable tourısm and recreatıon areas ın artvın provınce

Türkiye pek çok klimatik bölgeden ve çeşitli topoğrafik özelliklerden oluşan büyük bir ülkedir. Sahip olduğu eşsiz doğa, kültür değerleri ve özel konumu ile her türlü turizm aktivitesi ve çeşitliliğine, alternatif turizme olanak sağlayan, zengin çevre kaynaklarına sahiptir. Bu bağlamda farklı klimatik özellikleri ile Karadeniz bölgesinde yer alan Artvin İli, turizm ve rekreasyon aktiviteleri için kaynak oluşturan alanlardan biridir. İl, turizm potansiyelinin yanında, doğal peyzaj özellikleri ve iklimi ile bilimsel çalışmalara iyi bir kaynak oluşturmaktadır. Yapılan bu çalışmada Artvin İli’nin, iklim verilerine göre, klimatik konfor açısından en uygun alanlarını saptamak amaçlanmıştır. Bu kapsamda, Artvin İli'ne ait iklimsel değişimleri ortaya koyabilmek amacıyla 12 adet iklim istasyonu seçilmiştir. Bu istasyonlara ilişkin ortalama sıcaklık, bağıl nem ve rüzgâr değerleri Coğrafi Bilgi Sitemleri (CBS) ortamına ArcView 3.3 yazılımı kullanılarak aktarılmıştır. CBS ortamına aktarılan sayısal iklim verilerinden iklim haritaları oluşturulmuş ve klimatik konfor açısından uygun alanlar belirlenmiştir.Turkey is a big country of a varied topography and so it has many climatic zones. Tourism is one of the most important sector either at national or international level. On the other hand with its natural and cultural values, rich environmental sources and unique location linking the two continents, Turkey is an important country having the ability of supplying media for various types of tourism activity and alternative tourism approaches. In this frame, with their various climatic properties, Province of Artvin located in Blacksea Region is one of the main sources of recreation and tourism areas. Besides the touristic potential of the province, its natural specialties of landscape and climate are being a good source for scientific researches have had to be determined. In this study it was aimed that the most suitable areas for climatic comfort in Artvin Province were determined. Twelve different were chosen to define climatic variations. Average temperature, moister and wind speed values of these different climate stations were transferred into GIS environment by using Arc View 3.3 software. From the data transferred into GIS environment, climate maps created and most suitable areas for climatic comfort were determined

El Reno (Okla.) Daily Tribune

Daily newspaper from El Reno, Oklahoma that includes local, state, and national news along with advertising

1987-2000 yılları arası Bilkent Üniversitesi Fen Fakültesi tarihi

Ankara : İhsan Doğramacı Bilkent Üniversitesi İktisadi, İdari ve Sosyal Bilimler Fakültesi, Tarih Bölümü, 2016.This work is a student project of the The Department of History, Faculty of Economics, Administrative and Social Sciences, İhsan Doğramacı Bilkent University.by Özer, Abdürrahim

Multicore and manycore parallelization of cheap synchronizing sequence heuristics

An important concept in finite state machine based testing is synchronization which is used to initialize an implementation to a particular state. Usually, synchronizing sequences are used for this purpose and the length of the sequence used is important since it determines the cost of the initialization process. Unfortunately, the shortest synchronization sequence problem is NP-Hard. Instead, heuristics are used to generate short sequences. However, the cubic complexity of even the fastest heuristic algorithms can be a problem in practice. In order to scale the performance of the heuristics for generating short synchronizing sequences, we propose algorithmic improvements together with a parallel implementation of the cheapest heuristics existing in the literature. To identify the bottlenecks of these heuristics, we experimented on random and slowly synchronizing automata. The identified bottlenecks in the algorithms are improved by using algorithmic modifications. We also implement the techniques on multicore CPUs and Graphics Processing Units (GPUs) to take benefit of the modern parallel computation architectures. The sequential implementation of the heuristic algorithms are compared to our parallel implementations by using a test suite consisting of 1200 automata. The speedup values obtained depend on the size and the nature of the automaton. In our experiments, we observe speedup values as high as 340x by using a 16-core CPU parallelization, and 496x by using a GPU. Furthermore, the proposed methods scale well and the speedup values increase as the size of the automata increases

Familial Mediterranean fever: perspective on female fertility and disease course in pregnancy from a multicenter nationwide network.

The aim of this study was to analyze the pregnancy process, especially the Familial Mediterranean fever (FMF) disease course and attack types during pregnancy, and to examine the relationship between disease-related factors and female infertility in FMF patients. The study, which was planned in a multicenter national network, included 643 female patients. 435 female patients who had regular sexual intercourse were questioned in terms of infertility. Pregnancy and delivery history, FMF disease severity and course during pregnancy were evaluated. The relationship between demographic and clinical findings, disease severity, genetic analysis results and infertility was investigated. 401 patients had at least 1 pregnancy and 34 patients were diagnosed with infertility. 154 patients had an attack during pregnancy. 61.6% of them reported that attacks during pregnancy were similar to those when they were not pregnant. The most common attack symptoms were fever, fatigue and abdominal pain-peritonitis (96%, 87%, and 83%, respectively) in the pregnancy period. The disease-onset age, disease activity score, gene mutation analyses, and regular colchicine use (> 90%) were similar between the fertile and infertile groups, while the frequency of previous appendectomy and alcohol consumption rates were higher in individuals with infertility. Our results indicated no significant change in the frequency and severity of attacks during pregnancy. The low rate of infertility (7.8%) in our patients was noted. It has been suggested that the risk of FMF-related infertility may not be as high as thought in patients who are followed up regularly and received colchicine

Familial mediterranean fever: assessment of clinical manifestations, pregnancy, genetic mutational analyses, and disease severity in a national cohort

The aims of this study were to investigate the main clinical and laboratory features, including pregnancy and genetic analysis, of Turkish Familial Mediterranean Fever (FMF) patients and to analyze the relationships between genotypic features, age of disease onset, clinical findings, and disease severity. A study was planned within a national network of 22 different centers. Demographics, clinical and laboratory findings, attack characteristics, drugs, pregnancy and birth history, disease severity, and gene mutation analyses were evaluated. Disease severity, assessed using a scoring system developed by Pras et al., was evaluated in relation to gene mutations and age of disease onset. A total of 979 patients (643 females and 336 males; mean age: 35.92 +/- 11.97 years) with FMF were included in the study. Of a total of 585 pregnancies, 7% of them resulted in preterm birth and 18.1% resulted in abortions. During pregnancy, there was no FMF attack in 61.4% of patients. Of the MEditerranean FeVer (MEFV) mutations, 150 (24.3%) cases were homozygous, 292 (47.3%) cases were heterozygous, and 175 (28.4%) were compound heterozygous. Patients with homozygous gene mutations had more severe disease activity, earlier age of disease onset, higher rates of joint and skin involvement, sacroiliitis, and amyloidosis. Patients with compound heterozygous genotype displayed severe disease activity in close resemblance to patients with homozygous mutation. In addition, patients with compound heterozygous mutations had higher rates of protracted febrile myalgia and elevated fibrinogen levels. In 63.9% of compound heterozygous patients, age of onset was < 20 years, with greater disease severity, and high rates of attack frequency and colchicine resistance. Our results suggest that indicators for disease severity include early onset of disease and homozygous gene mutations. Furthermore, patients with compound heterozygous mutations displayed significant presentations of severe disease activity