A Comparative Survey on Wireless Internet Usage and Future Expectations of University Students -The Cases of USF, AKU and IUS

In this article, college students’ internet usage and the expectations for better wireless access are discussed. Wireless and mobile internet access recently became an integral part of our lives. Especially, with the introduction of smart devices (phones, tablets etc.) into the wireless market and the vast number of applications running on these devices, we end up being addicted to them. Now, some of us have come to a point where we can leave everything behind us except our phones. To better understand how the wireless access has influenced us we conducted a face-to-face survey with three different groups of college students totalling 829. According to the survey, there are some problems while using the internet, such as internet speed and connection. University students do not want to give up mobile communications and they never want to be secondary users. They pay more attention to security and privacy in communication. They are also awaiting functional innovations in the future

Transport in an idealized three-gyre system with application to the Adriatic Sea

Author Posting. © American Meteorological Society, 2009. This article is posted here by permission of American Meteorological Society for personal use, not for redistribution. The definitive version was published in Journal of Physical Oceanography 39 (2009): 675-690, doi:10.1175/2008JPO3975.1.Motivated by observations of surface drifters in the Adriatic Sea, transport in a three-gyre system is studied with the aid of dynamical systems techniques. Particular attention is paid to the issue of intergyre transport. The velocity field is assumed to be two-dimensional and incompressible and composed of a steady three-gyre background flow on which a time-dependent perturbation is superimposed. Two systems of this type are considered: 1) an observationally motivated, analytically prescribed model consisting of a steady background on which a multiperiodic time-dependent perturbation is superimposed, and 2) an observationally based model of the Adriatic Sea consisting of the mean surface circulation derived from surface drifter trajectories on which a time-dependent altimetry-based perturbation velocity field is superimposed. It is shown that for a small perturbation to the steady three-gyre background, two of the gyres exchange no fluid with the third gyre. When the perturbation strength exceeds a certain threshold, transport between all three gyres occurs. This behavior is described theoretically, illustrated using the analytic model and shown to be consistent with the observationally based model of the Adriatic. The relevance of the work presented to more complicated multiple-gyre problems is discussed.This work was supported by the National Science Foundation Grants CMG0417425 and CMG0825547

Chaos in Biological Control Systems

It has been known for some time that the population densities of insect pests in nature show wide fluctuations over time, but whether these fluctuations represent chaotic dynamics or are the result of environmental noise superimposed on steady cycles remains open to question. We have carried out a theoretical case study of the dynamics of European corn borer populations, using field and laboratory data to construct models that simulate field conditions to learn which variables govern chaotic behavior. We show that small changes in parameters affected by weather can cause a steady cycle to become wild and unpredictable. Most importantly, from a practical point of view, when the chaotic state is reached the population of corn borers can reach values higher than it does in a stable cycle. We find this to be true whether the biological control agent is a natural pathogen of the corn borer (Model I) or the same, widely occurring pathogen plus a toxin, produced either by a genetically engineered plant parasite or a genetically engineered host plant (Model II). This behavior might not be observable in limited field trials, depending on the particular environmental conditions. Before releasing new biological control agents into large open fields, it would seem advisable to investigate their behavior in laboratory microcosms where the variables, including those shown in our models to be capable of inducing chaos in corn borer populations, can be controlled at will

Intermittent transition between order and chaos in an insect pest population

The causes of the erratic seasonal variation in the sizes of some insect pest populations are largely unknown, but they are believed to be associated, at least in part, with environmental change. The attendant lack of predictability makes the control of insect pests difficult, resulting in substantial losses. In a model simulation study, using parameter values based on field data, it is shown that under certain conditions a population experiencing regular periodic cycles (therefore being predictable) can become chaotic (i.e. erratic) in the absence of changes in environmental factors. Moreover, after a time the population returns to regular stable cycles. The process recurs and represents an intrinsic characteristic of the system. This phenomenon, known as intermittency, occurs when certain variables have values that place the system near the transition point between order and chaos. This discovery may help explain the erratic behaviour of some insect pest population and aid in developing better biological control measures

Comparative study of photodynamic therapy monotherapy versus triple management in age-related macular degeneration

Aim: To compare the effectiveness of photodynamic therapy (PDT) and PDT combined with intravitreal triamcinolone (IVTA) and vascular endothelial growth factor inhibition (anti-VEGF) in age-related macular degeneration (AMD)

Invariant-tori-like Lagrangian coherent structures in geophysical flows

The term "Lagrangian coherent structure" (LCS) is normally used to describe numerically detected structures whose properties are similar to those of stable and unstable manifolds of hyperbolic trajectories. The latter structures are invariant curves, i.e., material curves of fluid that serve as transport barriers. In this paper we use the term LCS to describe a different type of structure whose properties are similar to those of invariant tori in certain classes of two-dimensional incompressible flows. Like stable and unstable manifolds, invariant tori are invariant curves that serve as transport barriers. There are many differences, however, between traditional LCSs and invariant-tori-like LCSs. These differences are discussed with an emphasis on numerical techniques that can be used to identify invariant-tori-like LCSs. Structures of this type are often present in geophysical flows where zonal jets are present. A prime example of an invariant-torus-like LCS is the transport barrier near the core of the polar night jet in the Earth's lower and middle stratospheres in the austral winter and early spring; this is the barrier that traps ozone-depleted air inside the ozone hole. This example is investigated using both a simple analytically prescribed flow and a velocity field produced by a general circulation model of the Earth's atmosphere

Zonal Jets as Meridional Transport Barriers in the Subtropical and Polar Lower Stratosphere

Abstract Applications of recent results from dynamical systems theory to the study of transport and mixing in incompressible two-dimensional flows lead to the expectation that, independent of the background potential vorticity (PV) distribution, weakly perturbed zonal jets are associated with barriers that inhibit meridional transport. Here the authors provide evidence in support of this expectation based on the analysis of isentropic winds in the lower stratosphere as produced by the Canadian Middle Atmosphere Model (CMAM), a comprehensive general circulation model. Specifically, barriers to meridional transport are found to be associated with the (eastward) austral polar night jet, for which the meridional gradient of background PV is large, and also for the (westward) boreal summer subtropical jet, for which the background PV gradient is quite small. The identification of the meridional transport barriers is based on the computation of finite-time Lyapunov exponents (FTLEs), which characterize the amount of stretching about fluid particle trajectories. Being composed of regular fluid particle trajectories lying on invariant tori, the meridional transport barriers are identified with topologically circular, local minimizing curves or trenches of the backward-plus-forward FTLE field. Results from explicit passive tracer advection experiments and flux computations are also presented, which are consistent with results inferred using the FTLE diagnostic

Fikir Hareketleri Dergisi (1933-1940)

Editörlüğünü Murat Yılmaz'ın yaptığı bu ciltte 50'nin üzerinde yazı var ve 40'ın üzerinde yazar katkıda bulunuyor. Bu ciltte yer alan yazı ve yazarlar kitaptaki sıralarıyla şöyle: Mustafa Erdoğan, Liberalim ve Türkiye’deki Serüveni, Ahmet İnsel, Türkiye’de Liberalizm Kavramının Soyçizgisi, F. Hasan Arol, Mehmet Cavit Bey, Atilla Doğan, Ulum-u İktisadiye ve İçtimaiye Mecmuası’nda Liberal Anlayış, Deniz Karaman, Ulum-u İktisadiye ve içtimaiye Mecmuası, Nilgün Toker, Türkiye’de Liberalizm ve Birey, Hamit Bozarslan, Ali Fethi Okyar, H. Bahadır Türk, Halide Edip Adıvar’ın Liberalizmle İmtihanı, Güven Bakırezer, Türkiye’de Sosyal Liberalizm(1908-1945), Murat Yılmaz, Hüseyin Sırrı Bellioğlu, Ahmet Demirel, Milli Mücadele Döneminde Birinci Meclis’teki Liberal Fikirler ve Tartışmalar, Ahmet Demirel, Ali Şükrü Bey ve Tan Gazetesi, Murat Yılmaz, Tek Parti, CHP, Kemalizm ve Liberalizm, Murat Yılmaz, CHP İlkelerinin 1937’de Anayasaya girişi ve Liberalizmin Yasaklanışı, Murat Yılmaz, Çiftçiyi Topraklandırma Kanunu Görüşmeleri, Cem Emrence, Serbest Cumhuriyet Fırkası (1930), Hakkı Uyar, SCF’nin Yayın Organı: Serbest Cumhuriyet Gazetesi, Hakkı Uyar, Ağaoğlu Ahmet’in “Liberal Muhalif” Gazetesi: Akın, Zühtü Arslan, Türkiye’de Liberal Düşüncenin Önündeki Engeller, Simten Coşar, Ahmet Ağaoğlu, Cemil Koçak, Hüseyin Cahit Yalçın ve Fikir Hareketleri Dergisi (1933-1940), Ferudun Yılmaz, Sabri F. Ülgener ve Liberalizm, Zühtü Arslan, Türkiye’de Anayasacılık Hareketleri ve Liberalizm, Aliyar Demirci, Ali Fuat Başgil, Hüseyin Sadoğlu, Hür Fikirleri Yayma Cemiyeti, Murat Koraltürk- Cem Çetin, Türkiye’de Liberal İktisadî Düşünce, Emrah Akkurt, Feridun Ergin, Didem Gürses, Ahmet Hamdi Başar, Murat Yılmaz, Halil Menteşe, Haluk Alkan, Türk İşadamları ve Liberal Düşünce, Melih Yürüşen, Mehmet Ata Mermerci, Murat Yılmaz, Namık Zeki Aral, Ayşe Buğra, Türk İşadamları ve Liberalizm, Hamit Emrah Beriş, Türk Sağı ve Liberalizm, Simten Coşar, Aydın Yalçın, Simten Coşar, Yeni Forum, Ferudun Yılmaz, Türkiye’de Çağdaş İslamcı (İktisadî) Düşünce ve (İktisadî) Liberalizm, Ahmet Arslan, İslâm ve Liberal Demokrasi, Mustafa Erdoğan, Liberalizm ve İslâm, Soli Özel Ali Sarıkaya, Türkiyede Liberalizmin Prangaları, Aliyar Demirci, Ahmet Emin Yalman, Tanel Demirel, Demokrat Parti, Tanıl Bora, Adnan Menderes, Cumhur Arslan, Samet Ağaoğlu, Ertuğrul Günay, Fevzi Lütfi Karaosmanoğlu, Hamit Emrah Beriş, Kemalist Liberal Sentez Çabası, Burhan Özçetin Sibel Demirci, Hürriyet Partisi, Tanel Demirel, Adalet Partisi, Tanıl Bora, Süleyman Demirel, Atilla Yayla, Özal, Özal Reformları ve Liberalizm, Tanıl Bora, Turgut Özal, Alper Görmüş, 1990’ların Başındaki Liberal Kıvılcım: YDH, Bekir Berat Özipek, Kâzım Berzeg, Bekir Berat Özipek, Liberal Düşünce Topluluğu, Bağış Erten, Liberal (Demokrat?) Parti, Alev Özkazanç, Türkiye’nin Neo-Liberal Dönüşümü ve Liberal Düşünce, Necmi Erdoğan Fahriye Üstüner, 1990’larda “Siyaset Sonrası” Söylemler ve Denemeler. Türkiye’de liberalizmin, çok partili döneme geçildiğinden beri iktisadî ve siyasî “merkez”i oluşturduğu varsayımı güçlüdür. Diğer yandan, liberal siyasal kimliği benimseyenler, bu düşünce akımının Türkiye’de hiçbir zaman -en azından Özal dönemine kadar- tutarlı bir temele kavuşamadığını söylerler. MTSD serisinin yedinci cildi Liberalizm, bu tartışmaya zengin malzeme sağlıyor. Ciltte, başta “merkez sağ”ın partileri ve liderleri olmak üzere, liberalizmle bir biçimde ilintili sayılagelen figürler, liberal ideolojiyle bağları açısından tahlil ediliyor. Liberal siyasî düşünceyi temellendirmeye çalışmış -çoğu unutulan- fikir insanları, çevreler ele alınıyor. Liberalizmin modernizm, milliyetçilik, sağcılık, Kemalizm ve İslâmcılıkla eklemlenme veya zıtlaşma tarzları inceleniyor. Liberal yönelimlere, dönemsel bağlamları içinde de bakılıyor

Central Nervous System Fungal Infections in Children With Leukemia and Undergoing Hematopoietic Stem Cell Transplantation: A Retrospective Multicenter Study

Background: Central nervous system fungal infections (CNSFI) are seen in patients with hematologic malignancies and have high morbidity and mortality. Because of their rarity, there is limited data on CNSFI in children with no established treatment protocols or guidelines