Publications without Fulltext
Permanent URI for this collectionhttps://hdl.handle.net/20.500.14288/3
Browse
6 results
Search Results
Publication Metadata only Newton-cartan connections with torsion(Istanbul Technical University, 2004) Koçak, Şahin; Limoncu, Murat; Department of Physics; Dereli, Tekin; Faculty Member; Department of Physics; College of Sciences; 201358We re-formulate the notion of a Newton-Cartan manifold and clarify the compatibility conditions of a connection with torsion with the Newton-Cartan structure.Publication Metadata only Predictions on three-particle azimuthal correlations in proton-proton collisions(Scientific Technical Research Council Turkey-Tubitak, 2018) N/A; Department of Physics; Özönder, Şener; Researcher; Department of Physics; College of Sciences; N/AThe ridge signal, which is long-ranged in rapidity, in di-hadron correlations in high-multiplicity p-p and p-A collisions opened up a whole new research area in high-energy QCD. Although the ridge had been observed in A-A collisions and interpreted as a result of the radial flow of quark-gluon plasma, it had not appeared until recently in the data of small collision systems such as p p and p A, nor had it been predicted theoretically or seen in event generators. There are two competing approaches that attempt to explain the systematics of the di-hadron ridge signal: hydrodynamics and gluon saturation physics (color glass condensate/glasma). In this work, we present predictions for the transverse momentum and rapidity dependence of the three-particle correlation function within gluon saturation physics. Tri-hadron correlations can be measured, and the data can possibly rule out one of the two alternative approaches.Publication Metadata only Degenerate spin structures and the Levy-Leblond equation(Scientific and Technological Research Council of Turkey, 2006) Limoncu, Murat; Koçak, Şahin; Department of Physics; Dereli, Tekin; Faculty Member; Department of Physics; College of Sciences; 201358Newton-Cartan manifolds and the Galilei group are defined by the use of co-rank one degenerate metric tensor. Newton-Cartan connection is lifted to the degenerate spinor bundle over a Newton-Cartan 4-manifold by the aid of degenerate spin group. Levy-Leblond equation is constructed with the lifted connection.Publication Metadata only Investigation of oxygen-dependent motility and swarming behavior in nematode Nematode Caenorhabditis Elegans(Atatürk Üniversitesi, 2022) N/A; Department of Physics; Kocabaş, Aşkın; Faculty Member; Department of Physics; College of Sciences; 227753Model organism Caenorhabditis elegans can perform swarming behavior in nature. This behavior is intricately linked to the presence of bacteria and oxygen levels in the environment. The complex interplay of all these factors drives the emergence of a self-organized swarming response. The collective motility of this behavior is particularly controlled by the oxygen-dependent velocity profile of the animals which triggers phase separation into dense and dilute clusters. However, the exact velocity profile leading to this transition has not been determined yet. In this study, we experimentally identified this missing information by using a liquid environment. The main difference in this measurement is to use liquid culture to be able to stimulate both head and tail neurons with the same oxygen level. We utilized fiber optic-based sensors to precisely measure oxygen levels that correlated with the animal’s velocity. Finally, based on these experimental results, we modeled swarming behavior using phase separation principles. / Nematod Caenorhabditis elegans (C. elegans) doğada sürü davranışı gösterebilen bir model Model organism Caenorhabditis elegans can perform swarming behavior in nature. This behavior is intricately linked to the presence of bacteria and oxygen levels in the environment. The com- plex interplay of all these factors drives the emergence of a self-organized swarming response. The collective motility of this behavior is particularly controlled by the oxygen-dependent velocity profile of the animals which triggers phase separation into dense and dilute clusters. However, the exact velocity profile leading to this transition has not been determined yet. In this study, we experimentally identified this missing information by using a liquid environment. The main difference in this measurement is to use liquid culture to be able to stimulate both head and tail neurons with the same oxygen level. We utilized fiber optic-based sensors to precisely mea- sure oxygen levels that correlated with the animal’s velocity. Finally, based on these experimental results, we modeled swarming behavior using phase separation principles. / Nematod Caenorhabditis elegans (C. elegans) doğada sürü davranışı gösterebilen bir model orga- nizmadır. C. elegans sürü oluşturma özellikleri, bulunduğu ortamdaki oksijen ve bakteri seviyesi ile direk ilişkilidir. Bu etkilerin karmaşık bir sonucu olarak C. elegans kendiliğinden organize olabilen kalabalık gruplar oluşturmaktadır. Bu grupların kolektif hareketleri canlının hız profilinin oksijen seviyesine bağlılığı tarafından kontrol edilmekte ve yoğunluğa göre farklı faz geçişleri göstermek- tedir. Bu grup oluşturma davranışlarını kontrol eden, gerçek hız profili tam olarak tespit edile- memektedir. Bu çalışmada C. elegans’ın hareket hızının, bulunduğu ortamın oksijen seviyesine bağlılığı tespit edilmiştir. Bu çalışmanın ayırıcı özelliği, canlının hem kuyruk hem de kafa sinir- leri aynı ortamı algılayacak şekilde, bir sıvı ortam ölçümü ile yapılmasıdır. Oksijen seviyeleri fiber optik oksijen sensörü ile belirlenmiş ve hareket hızı ile bağlantısı tespit edilmiştir. Tespit edilen deneysel hız profili, faz ayrımı prensibi kullanılarak sürü oluşturma davranışı matematiksel olarak modellenmiştir. organism Caenorhabditis elegans can perform swarming behavior in nature. This behavior is intricately linked to the presence of bacteria and oxygen levels in the environment. The com- plex interplay of all these factors drives the emergence of a self-organized swarming response. The collective motility of this behavior is particularly controlled by the oxygen-dependent velocity profile of the animals which triggers phase separation into dense and dilute clusters. However, the exact velocity profile leading to this transition has not been determined yet. In this study, we experimentally identified this missing information by using a liquid environment. The main difference in this measurement is to use liquid culture to be able to stimulate both head and tail neurons with the same oxygen level. We utilized fiber optic-based sensors to precisely mea- sure oxygen levels that correlated with the animal’s velocity. Finally, based on these experimental results, we modeled swarming behavior using phase separation principles. / Nematod Caenorhabditis elegans (C. elegans) doğada sürü davranışı gösterebilen bir model orga- nizmadır. C. elegans sürü oluşturma özellikleri, bulunduğu ortamdaki oksijen ve bakteri seviyesi ile direk ilişkilidir. Bu etkilerin karmaşık bir sonucu olarak C. elegans kendiliğinden organize olabilen kalabalık gruplar oluşturmaktadır. Bu grupların kolektif hareketleri canlının hız profilinin oksijen seviyesine bağlılığı tarafından kontrol edilmekte ve yoğunluğa göre farklı faz geçişleri göstermek- tedir. Bu grup oluşturma davranışlarını kontrol eden, gerçek hız profili tam olarak tespit edile- memektedir. Bu çalışmada C. elegans’ın hareket hızının, bulunduğu ortamın oksijen seviyesine bağlılığı tespit edilmiştir. Bu çalışmanın ayırıcı özelliği, canlının hem kuyruk hem de kafa sinir- leri aynı ortamı algılayacak şekilde, bir sıvı ortam ölçümü ile yapılmasıdır. Oksijen seviyeleri fiber optik oksijen sensörü ile belirlenmiş ve hareket hızı ile bağlantısı tespit edilmiştir. Tespit edilen deneysel hız profili, faz ayrımı prensibi kullanılarak sürü oluşturma davranışı matematiksel olarak modellenmiştir.nizmadır. C. elegans sürü oluşturma özellikleri, bulunduğu ortamdaki oksijen ve bakteri seviyesi ile direk ilişkilidir. Bu etkilerin karmaşık bir sonucu olarak C. elegans kendiliğinden organize olabilen kalabalık gruplar oluşturmaktadır. Bu grupların kolektif hareketleri canlının hız profilinin oksijen seviyesine bağlılığı tarafından kontrol edilmekte ve yoğunluğa göre farklı faz geçişleri göstermektedir. Bu grup oluşturma davranışlarını kontrol eden, gerçek hız profili tam olarak tespit edilememektedir. Bu çalışmada C. elegans’ın hareket hızının, bulunduğu ortamın oksijen seviyesine bağlılığı tespit edilmiştir. Bu çalışmanın ayırıcı özelliği, canlının hem kuyruk hem de kafa sinirleri aynı ortamı algılayacak şekilde, bir sıvı ortam ölçümü ile yapılmasıdır. Oksijen seviyeleri fiber optik oksijen sensörü ile belirlenmiş ve hareket hızı ile bağlantısı tespit edilmiştir. Tespit edilen deneysel hız profili, faz ayrımı prensibi kullanılarak sürü oluşturma davranışı matematiksel olarak modellenmiştir.Publication Metadata only Critical dynamics in biological Boolean networks follows from symmetric response to input genes(Scientific and Technological Research Council Turkey, 2022) N/A; Department of Physics; Çoban, Hamza; Kabakçıoğlu, Alkan; Master Student; Faculty Member; Department of Physics; Graduate School of Sciences and Engineering; College of Sciences; N/A; 49854a recent observation on an extensive collection of biological gene regulatory networks suggests that the regulatory dynamics is tuned to remain close to the order-chaos boundary in the Lyapunov sense [1]. We here investigate, from a mathematical perspective, the structural/functional constraints which give rise to such accumulation around criticality in these systems. While the role of canalizing functions in this respect is well established, we find that critical sensitivity to small input variations also follows from an over-abundance of symmetrical inputs, i.e. regulatory genes invoking identical or complementary responses on their common target. a random network ensemble constructed to have the same distribution of symmetric inputs as in the above collection of biological networks captures the dependence of the sensitivity on mean activity bias, A nontrivial characteristic which the canalizing ensemble fails to fully reproduce.Publication Metadata only Quantum thermodynamics and quantum coherence engines(Scientific Technical Research Council Turkey-Tubitak, 2020) Department of Physics; Department of Physics; Tuncer, Aslı; Müstecaplıoğlu, Özgür Esat; Researcher; Faculty Member; Department of Physics; College of Sciences; College of Sciences; N/A; 1674The advantages of quantum effects in several technologies, such as computation and communication, have already been well appreciated. Some devices, such as quantum computers and communication links, exhibiting superiority to their classical counterparts, have been demonstrated. the close relationship between information and energy motivates us to explore if similar quantum benefits can be found in energy technologies. investigation of performance limits for a broader class of information-energy machines is the subject of the rapidly emerging field of quantum thermodynamics. Extension of classical thermodynamical laws to the quantum realm is far from trivial. This short review presents some of the recent efforts in this fundamental direction. It focuses on quantum heat engines and their efficiency bounds when harnessing energy from nonthermal resources, specifically those containing quantum coherence and correlations.