cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Τεχνοοικονομική αξιολόγηση μονάδας παραγωγής βιοαερίου από απόβλητα αγελάδων και χοίρων
Creators: name: Παγίδης, Δημήτριος Ζαχαρία
Publisher: name: Aristotle University of Thessaloniki
Year: 2016
Subjects: Αναερόβια χώνευση
Τεχνοοικονομική αξιολόγηση
Βιοαέριο
Anaerobic digestion
Techno-economic evaluation
Biogas

description: Στο πλαίσιο οικονομικής αξιολόγησης μίας Μονάδας Επεξεργασίας Κτηνοτροφικών Αποβλήτων - Μονάδας Παραγωγής Βιοαερίου (ΜΕΚΑ - ΜΠΒ) πραγματοποιήθηκε ο σχεδιασμός μίας ΜΕΚΑ - ΜΠΒ, που θα χρησιμοποιηθεί σαν πιλότος. Η διαστασιολόγηση αφορά την επεξεργασία των αποβλήτων από μονάδες εκτροφής χοίρων και μονάδες εκτροφής βοοειδών, με ημερήσια παραγωγή περίπου 140 m3 ανά ημέρα ανεπεξέργαστων μεικτών αποβλήτων και παραγωγή 500 kw ωριαίος ηλεκτρικού ρεύματος. Για να πραγματοποιηθεί η παρούσα αξιολόγηση, υπολογίστηκε η επένδυση κεφαλαίου, που αποτελείται από την επένδυση πάγιου κεφαλαίου και το κεφάλαιο κίνησης, το κόστος μεταφοράς, το κόστος λειτουργίας, οι πάγιες χρεώσεις, καθώς και τα έσοδα. Με βάση τα παραπάνω υπολογίστηκαν οι αθροιστικές χρηματοροές για δύο σενάρια λειτουργίας και εγκατάστασης, ένα με λήψη επιδότησης και ένα χωρίς επιδότηση, αλλά μόνο με τραπεζικό δανεισμό. Η οικονομική βιωσιμότητα του έργου εξετάστηκε μέσω της ανάλυσης αποδοτικότητας, με βάση τα ακόλουθα κριτήρια, ρυθμός απόδοσης της επένδυσης (ROI), καθαρή παρούσα αξία (NPV) και εσωτερικός βαθμός απόδοσης (IRR). Βάσει των αποτελεσμάτων της οικονομικής ανάλυσης για την εγκατάσταση ΜΕΥΑ και ΜΒ, αποδεικνύεται ότι η επένδυση είναι βιώσιμη και αποδοτική, ενώ με βάση τους υπολογισμένους δείκτες μπορεί να γίνει αξιολόγηση της εν δυνάμει κερδοφορίας του έργου και καθορίζεται μια συγκεκριμένη απόδοση ανά έργο.
description: In this economic evaluation of Livestock Waste Treatment Plant - Biogas Plant, a plant was designed, which will serve as a pilot. The sizing of the processing of waste from pig and cattle farms with a daily production of about 140 m3 per day of untreated mixed waste which produce 500 kw hourly electricity. To perform this evaluation, the capital investment was calculated, which consists of the fixed capital investment and the working capital, the transportation costs, the operating costs, the fixed charges and the income, were also included. Based on the above estimated cumulative cash flows for two operating and installation scenarios, one with receiving a subsidy and one without subsidy, but only with bank loan. The economic viability of the project was examined through efficiency analysis, based on the following criteria, the return on investment (ROI), net present value (NPV) and internal rate of return (IRR). Based on the results of the economic analysis for the installation of the biogas plant, it is shown that the investment is viable and profitable and based on the calculated indicators the potential profitability of the project can be assessed and a specific performance per project can be specified.
N=4 superconformal mechanics as a Non linear Realization
Creators: name: Anabalon, Andres
name: Gomis, Joaquim
name: Kamimura, Kiyoshi
name: Zanelli, Jorge
Publisher: name: arXiv
Year: 2006
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: An action for a superconformal particle is constructed using the non linear realization method for the group PSU(1,1|2), without introducing superfields. The connection between PSU(1,1|2) and black hole physics is discussed. The lagrangian contains six arbitrary constants and describes a non-BPS superconformal particle. The BPS case is obtained if a precise relation between the constants in the lagrangian is verified, which implies that the action becomes kappa-symmetric.
description: new subection, references added and new acknowledgments
Universal coefficient theorem in triangulated categories
Creators: name: Pirashvili, Teimuraz
name: Redondo, Maria Julia
Publisher: name: arXiv
Year: 2006
Subjects: subject: Category Theory (math.CT)
subject: FOS: Mathematics
subject: 18E30

description: Let T be a triangulated category, A a graded abelian category and h: T -> A a homology theory on T with values in A. If the functor h reflects isomorphisms, is full and is such that for any object x in A there is an object X in T with an isomorphism between h(X) and x, we prove that A is a hereditary abelian category and the ideal Ker(h) is a square zero ideal which as a bifunctor on T is isomorphic to Ext^1_A(h(-)[1], h(-)).
description: Final version, to appear in Algebras and Representation Theory
Orbital Configurations and Magnetic Properties of Double-Layered Antiferromagnet Cs$_3$Cu$_2$Cl$_4$Br$_3$
Creators: name: Yamada, F.
name: Ono, T.
name: Tanaka, H.
name: Yamaura, J.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: We report the single-crystal X-ray analysis and magnetic properties of a new double-layered perovskite antiferromagnet, Cs$_3$Cu$_2$Cl$_4$Br$_3$. This structure is composed of Cu$_2$Cl$_4$Br$_3$ double layers with elongated CuCl$_4$Br$_2$ octahedra and is closely related to the Sr$_3$Ti$_2$O$_7$ structure. An as-grown crystal has a singlet ground state with a large excitation gap of $Δ/k_{\rm B}\simeq 2000$ K, due to the strong antiferromagnetic interaction between the two layers. Cs$_3$Cu$_2$Cl$_4$Br$_3$ undergoes a structural phase transition at $T_{\rm s}\simeq330$ K accompanied by changes in the orbital configurations of Cu$^{2+}$ ions. Once a Cs$_3$Cu$_2$Cl$_4$Br$_3$ crystal is heated above $T_{\rm s}$, its magnetic susceptibility obeys the Curie-Weiss law with decreasing temperature even below $T_{\rm s}$ and does not exhibit anomalies at $T_{\rm s}$. This implies that in the heated crystal, the orbital state of the high-temperature phase remains unchanged below $T_{\rm s}$, and thus, this orbital state is the metastable state. The structural phase transition at $T_{\rm s}$ is characterized as an order-disorder transition of Cu$^{2+}$ orbitals.
description: 6pages. 6figures, to appear in J. Phys. Soc. Jpn. Vol.76 No.1
Η διήγηση της προσκύνησης των Μάγων στο κατά Ματθαίον Ευαγγέλιο (2:1-12) και η πρόσληψή της στον χριστιανικό κόσμο
Creators: name: Γούρου, Αικατερίνη Βασιλείου
Publisher: name: Aristotle University of Thessaloniki
Year: 2016
Subjects: Προσκύνηση
Μάγοι
Ματθαίος
Worship
Magi
Matthew

description: Σκοπός της παρούσας εργασίας ήταν να εξετάσουμε την παρουσία των Μάγων στην διήγηση της προσκύνησης του νεογέννητου Ιησού και στην συνέχεια την πρόσληψή της στον χριστιανικό κόσμο. Μέσα στα τέσσερα κεφάλαια της εργασίας μας ενδεικτικάασχοληθήκαμε με το πιθανό υπόβαθρο της προσκύνησης των Μάγων, με την ταυτότητα των Μάγων, αλλά και με το γιατί ο ευαγγελιστής τοποθετεί τους Μάγους στην διήγηση της γέννησης του Ιησού. Επίσης, επισημάναμε τις πρώτες αναφορές της μεταγενέστερης χριστιανικής γραμματείας και είδαμε όσα αναφέρουν οι ερμηνευτές Πατέρες για την προσκύνηση των Μάγων στην ελληνική και λατινική χριστιανική γραμματεία. Στην συνέχεια, παρατηρήσαμε ότι οι Μάγοι έγιναν μέρος της πρωτοχριστιανικής τέχνης και είδαμε την εξέλιξή τους στην βυζαντινή και αναγεννησιακή τέχνη. Επιπλέον, αναφέραμε τις εκδοχές των αποκρύφων κειμένων και τις προσθήκες οι οποίες έγιναν στην διήγηση του Ματθαίου με συνέπεια την επίδραση, αλλά και την επικράτησή τους στην χριστιανική παράδοση. Τέλος, ολοκληρώσαμε την εργασία συμπεραίνοντας ότι οι Μάγοι με την παρουσία τους στην γέννηση του Ιησού αποτέλεσαν τους πρώτους μάρτυρες και προσκυνητές της γέννησης του Μεσσία και προανήγγειλαν την είσοδο των εθνικών στην Εκκλησία και στο σχέδιο του Θεού.
description: The aim of the present study was to examine the presence of Magi on the narrative of worship of Jesus birth and it’s receiving to the Christian world. In the four chapters of our study indicatively we worked with the possible background of the worship of the Magi, with the identity of the Magi, but also the reason why the evangelist puts the Magi in the story of Jesus’ birth. Also, we pointed out the first references of early Christian literature and we saw what the interpreters Fathers mentioned about the worship of Magi in Greek and Latin Christian literature. Then, we observed that the Magi became part of early Christian art and we saw their development in byzantine and renaissance art. In addition, we referred the versions of the apocrypha text and theadditions which were made in the narrative of Matthew and as a consequence their influence and their prevalence in the Christian tradition. Finally, we finished the study concluding that the Magi with their presence in the birth of Jesus were the first witnesses and worshipers of the Messiah’s birth and announced the entrance of Gentiles to the church and to God’s plan.
Higher Dimensional Unitary Braid Matrices: Construction, Associated Structures and Entanglements
Creators: name: Abdesselam, B.
name: Chakrabarti, A.
name: Dobrev, V. K.
name: Mihov, S. G.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Quantum Algebra (math.QA)
subject: High Energy Physics - Theory (hep-th)
subject: Quantum Physics (quant-ph)
subject: FOS: Mathematics
subject: FOS: Physical sciences

description: We construct $(2n)^2\times (2n)^2$ unitary braid matrices $\hat{R}$ for $n\geq 2$ generalizing the class known for $n=1$. A set of $(2n)\times (2n)$ matrices $(I,J,K,L)$ are defined. $\hat{R}$ is expressed in terms of their tensor products (such as $K\otimes J$), leading to a canonical formulation for all $n$. Complex projectors $P_{\pm}$ provide a basis for our real, unitary $\hat{R}$. Baxterization is obtained. Diagonalizations and block-diagonalizations are presented. The loss of braid property when $\hat{R}$ $(n>1)$ is block-diagonalized in terms of $\hat{R}$ $(n=1)$ is pointed out and explained. For odd dimension $(2n+1)^2\times (2n+1)^2$, a previously constructed braid matrix is complexified to obtain unitarity. $\hat{R}\mathrm{LL}$- and $\hat{R}\mathrm{TT}$-algebras, chain Hamiltonians, potentials for factorizable $S$-matrices, complex non-commutative spaces are all studied briefly in the context of our unitary braid matrices. Turaev construction of link invariants is formulated for our case. We conclude with comments concerning entanglements.
description: 26 pages, 1 figure, Addendum and new references are added. To appear in Journal of Mathematical Physics
Strong spin relaxation length dependence on electric field gradients
Creators: name: Csontos, Dan
name: Ulloa, Sergio E.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: We discuss the influence of electrical effects on spin transport, and in particular the propagation and relaxation of spin polarized electrons in the presence of inhomogeneous electric fields. We show that the spin relaxation length strongly depends on electric field gradients, and that significant suppression of electron spin polarization can occur as a result thereof. A discussion in terms of a drift-diffusion picture, and self-consistent numerical calculations based on a Boltzmann-Poisson approach shows that the spin relaxation length in fact can be of the order of the charge screening length.
description: 4 pages, 3 figures, to be presented at PASPSIV
Large magnetoresistance in intermetallic compounds R2Mn3Si5 (R = Tb, Dy and Ho)
Creators: name: Nirmala, R.
name: Malik, S. K.
name: Morozkin, A. V.
name: Yamamoto, Y.
name: Hori, H.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: Magnetization (M) and magnetoresistance (MR) measurements on polycrystalline R2Mn3Si5 (R = Tb, Dy and Ho) compounds (tetragonal, space group P4/mnc) have been carried out in the temperature range of 2 K-300 K, in various applied fields. Both, the rare earth and the Mn, are found to carry magnetic moments in these compounds. Mn has two sub-lattices (Mn1 and Mn2) that order magnetically at two different temperatures. Rare earth and Mn1 moments order ferromagnetically at TC1 whereas Mn2 is found to magnetically order at TC2 (TC1 = 89 K, 86 K, 78 K and TC2 = 18 K, 34 K, 16 K for R = Tb, Dy and Ho compounds, respectively). Magnetoresistance measurements reveal large negative MR values of about 50 % near TC2 at 9 T in all these compounds. This giant magnetoresistance is attributed to the spin-dependent scattering effects, competing exchange interactions and the layered structure of these compounds
description: Submitted to Europhys. Lett
An Elementary Introduction to the JWKB Approximation
Creators: name: Gough, D. O.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: Asymptotic expansion of the second-order linear ordinary differential equation Psi'' + k^2 f(z) Psi = 0, in which the real constant k is large and f = O(1), can be carried out in the manner of Liouville and Green provided f does not vanish. If f does vanish, however, at z_0 say, then Liouville-Green expansions can be carried out either side of the turning point z = z_0, but it is then necessary to ascertain how to connect them. This was first accomplished by Jeffreys, by a comparison of the differential equation with Airy's equation. Soon afterwards, the situation was found to arise in quantum mechanics, and was discussed by Brillouin, Wentzel and Kramers, after whom the method was initially named. It arises throughout classical physics too, and is encountered frequently when studying waves propagating in stars. This brief introduction is aimed at clarifying the principles behind the method, and is illustrated by considering the resonant acoustic-gravity oscillations (normal modes) of a spherical star.
description: 13 pages, 1 figure
Effect of Foam Insertion in Aneurysm Sac on Flow Structures in Parent Lumen: Relating Vortex Structures with Disturbed Shear
Creators: name: Pandey, Pawan Kumar
name: Das, Malay Kumar
Publisher: name: arXiv
Year: 2021
Subjects: subject: Fluid Dynamics (physics.flu-dyn)
subject: Medical Physics (physics.med-ph)
subject: FOS: Physical sciences

description: Numerous studies suggest that disturbed shear, causing endothelium dysfunction, can be related to neighboring vortex structures. With this motivation, this study presents a methodology to characterize the vortex structures. Precisely, we use mapping and characterization of vortex structures' changes to relate it with the hemodynamic indicators of disturbed shear. Topological features of vortex core lines (VCLs) are used to quantify the changes in vortex structures. We use the Sujudi-Haimes algorithm to extract the VCLs from the flow simulation results. The idea of relating vortex structures with disturbed shear is demonstrated for cerebral arteries with aneurysms virtually treated by inserting foam in the sac. To get physiologically realistic flow fields, we simulate blood flow in two patient-specific geometries before and after foam insertion, with realistic velocity waveform imposed at the inlet, using the Carreau-Yashuda model to mimic the shear-thinning behavior. With homogenous porous medium assumption, flow through the foam is modeled using the Forcheimmer-Brinkmann extended Darcy model. Results show that foam insertion increases the number of VCLs in the parent lumen. The average length of VCL increases by 168.9% and 55.6% in both geometries. For both geometries under consideration, results demonstrate that the region with increased disturbed shear lies in the same arterial segment exhibiting an increase in the number of oblique VCLs. Based on the findings, we conjecture that an increase in oblique VCLs is related to increased disturbed shear at the neighboring portion of the arterial wall.
description: 36 pages, 10 figures, 3 tables, submitted to Physical and Engineering Sciences in Medicine
Blockchain in agriculture
Creators: name: Kamilaris, Andreas
name: Cole, Ian
name: Prenafeta-Boldu, Francesc X.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Computers and Society (cs.CY)
subject: FOS: Computer and information sciences

description: Blockchain is an emerging digital technology allowing ubiquitous financial transactions among distributed untrusted parties, without the need of intermediaries such as banks. This chapter examines the impact of blockchain technology in agriculture and food supply chain, presents existing ongoing projects and initiatives, and discusses overall implications, challenges and potential, with a critical view over the maturity of these projects. Our findings indicate that blockchain is a promising technology towards a transparent supply chain of food, with many ongoing initiatives in various food products and food-related issues, but many barriers and challenges still exist, which hinder its wider popularity among farmers and systems. These challenges involve technical aspects, education, policies and regulatory frameworks.
description: arXiv admin note: substantial text overlap with arXiv:1908.07391
Friedmann Equation for Brans Dicke Cosmology
Creators: name: Arik, M.
name: Calik, M. C.
name: Sheftel, M. B.
Publisher: name: arXiv
Year: 2006
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: In the context of Brans-Dicke scalar tensor theory of gravitation, the cosmological Friedmann equation which relates the expansion rate $H$ of the universe to the various fractions of energy density is analyzed rigorously. It is shown that Brans-Dicke scalar tensor theory of gravitation brings a negligible correction to the matter density component of Friedmann equation. Besides, in addition to $Ω_Λ$ and $Ω_{M}$ in standard Einstein cosmology, another density parameter, $Ω_{_Δ}$, is expected by the theory. This implies that if $Ω_{_Δ}$ is found to be nonzero, data will favor this model instead of the standard Einstein cosmological model with cosmological constant and will enable more accurate predictions for the rate of change of Newtonian gravitational constant in the future.
description: minor reference changes
Κώστας Καλαντζής (1911-1988): παιδαγωγός, δάσκαλος, μεταρρυθμιστής της ειδικής αγωγής στην Ελλάδα
Creators: name: Γκόγκου, Ραφαέλα Γεωργίου
Publisher: name: Aristotle University of Thessaloniki
Year: 2016
Subjects: Κώστας Καλαντζής
Ειδική Αγωγή
Νοητική Αναπηρία
Kostas Kalantzis
Special Education
Intellectual disability

description: Σκοπός της παρούσας μεταπτυχιακής εργασίας, ήταν η παρουσίαση της προσωπικότητας του Κώστα Καλαντζή ως παιδαγωγού, δασκάλου και μεταρρυθμιστή της Ειδικής Αγωγής στην Ελλάδα. Αναφερθήκαμε σε ιστορικά στοιχεία που είχαν να κάνουν τόσο με το πλαίσιο της εποχής, όσο και με την πορεία που ακολούθησε η Ειδική Αγωγή. Στη συνέχεια προβήκαμε σε εννοιολογική αποσαφήνιση σημαντικών όρων, όπως ο κλάδος της Θεραπευτικής Παιδαγωγικής και η Νοητική Αναπηρία, και παρουσιάσαμε την εργογραφία του Καλαντζή. Στο σημείο αυτό, τονίσαμε πως ο ίδιος άρχισε να διαμορφώνει τις απόψεις του μέσα από τις διάφορες επιδράσεις τις οποίες δέχτηκε κατά τη διάρκεια των σπουδών του και της εργασίας του. Έπειτα, εκθέτουμε αναλυτικά τις απόψεις του για τα ζητήματα της Ειδικής Αγωγής, της Νοητικής Αναπηρίας, των Διαταραχών Λόγου και της Εκπαίδευσης στην Ελλάδα κατά την περίοδο 1925-1951. Αναφερόμαστε επίσης, και στο προφίλ που είχε ως δάσκαλος, τις αρχές που ακολουθούσε καθώς και που τις εφάρμοσε. Τέλος, παρουσιάζουμε και ένα αξιοσημείωτο κομμάτι στην δράση του Κώστα Καλαντζή, το οποίο έχει να κάνει με τις ενέργειες του, ως σύμβουλος για θέματα Ειδικής Αγωγής στο Υπουργείο Παιδείας το 1975.
description: The aim of this thesis was the presentation of Kostas Kalantzis personality as educator, teacher and reformer of special education in Greece. We referred to historical data that had to do with both the context of the time, and the path followed by the Special Education. Then we made a conceptual clarification of important terms, such as the industry of Therapeutic Education and Intellectual disability, and presented bibliography of Kalantzis. At this point, we mentioned that he began to formulate his views through the various effects which suffered during his studies and his work. Then we set out in detail its views on the issues of Special Education, the Intellectual disability, Speech Disorders and Education in Greece in the period 1925-1951. We refer also, his profile as a teacher and the principles that he followed and implemented. Finally, we present a remarkable point of Kostas Kalantzis, which has to do with the actions that he did, as a consultant for Special Education in the Ministry of Education in 1975.
Joshua's Total Solar Eclipse at Gibeon
Creators: name: Khalisi, Emil
Publisher: name: arXiv
Year: 2021
Subjects: subject: History and Philosophy of Physics (physics.hist-ph)
subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: FOS: Physical sciences

description: We reanalyse the solar eclipse linked to the Biblical passage about the military leader Joshua who ordered the sun to halt in the midst of the day (Joshua 10:12). Although there is agreement that the basic story is rooted in a real event, the date is subject to different opinions. We review the historical emergence of the text and confirm that the total eclipse of the sun of 30 September 1131 BCE is the most likely candidate. The Besselian Elements for this eclipse are re-computed. The error for the deceleration parameter of Earth's rotation, $ΔT$, is improved by a factor of 2.
description: 6 pages, 2 figures, 2 tables
Board Diversity and Firms Performance: An Empirical Study of Indian Publically Listed Companies Using Panel Data
Creators: name: Wishey Kataria, Vikas Deep
Publisher: name: Zenodo
Year: 2024
Subjects: Corporate Governance, Board Diversity,Gender Diversity, ROE, ROA, ROCE.

description: The present research finds out the effect of board diversity on the financial performance of publically listed Indian companies under the Bombay Stock Exchange (BSE 200). The aim is to investigate the influence of board diversity on firm performance, in terms of profitability and growth, the study made use ROA, ROE and ROCE as financial measures. The overall empirical investigation reveals a mixed set of results. The findings indicate that board diversity attributes such as foreign directors, directors with good qualification and a number of board meetings held every year are significantly influencing the performance level of firms (in terms of profitability of - ROA, ROE, and ROCE). Diversity always tends to have an impact on the decision making or strategic movements of the board members. It brings innovation, controls the working and slows decision – making process. The present study helps to make sense of the inconclusive results of past studies and provides relevant policy suggestions to the policymakers and modern business management to improve the firm’s performance.
The appropriated carrying capacity of tomato production : comparing the ecological footprints of hydroponic greenhouse and mechanized field operations
Creators: name: Wada, Yoshihiko
Publisher: name: University of British Columbia
Year: 2008

description: Agribusiness advocates claim that modern agro-technology has led to higher per hectare yields. In particular, hydroponic greenhouse agriculture is advanced as a new and particularly productive approach to high output farming. This may contribute to the belief that agricultural land can be urbanized because human ingenuity is seemingly developing substitutes for the lost soil. This thesis challenges this assumption by examining agricultural technology from an ecological perspective. It uses the concept of the ecological footprint (or appropriated carrying capacity) to compare the productivity of hydroponic agriculture with that of conventional open field operations. I assess and compare the biophysical inputs required by these operations to produce 1000 tonnes of tomatoes. These figures are then translated into corresponding land areas (in various categories) necessary to produce the required biophysical inputs. In contrast to common belief, hydroponic operations require 14 – 21 times more land than conventional open field operations to produce the same output (including the land directly occupied by the farms). This case study demonstrates the merits of appropriated carrying capacity analysis for assessing progress toward sustainability. It shows that hydroponic agriculture is a prime example of apparent economic success which is, in fact, ecologically unsustainable. There is no reason for confidence that we can pave over our agricultural lands just yet! Finally, this study demonstrates that the apparent yields of hydroponic greenhouse agriculture are partially a reflection of under priced resource inputs, a form of subsidy which is not sustainable.
Modulational instability and soliton generation in chiral Bose-Einstein condensates with zero-energy nonlinearity
Creators: name: Bhat, Ishfaq Ahmad
name: Sivaprakasam, S.
name: Malomed, Boris A.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Quantum Gases (cond-mat.quant-gas)
subject: FOS: Physical sciences

description: By means of analytical and numerical methods, we address the modulational instability (MI) in chiral condensates governed by the Gross-Pitaevskiiequation including the current nonlinearity. The analysis shows that this nonlinearity partly suppresses off the MI driven by the cubic self-focusing, although the current nonlinearity is not represented in the system's energy (although it modifies the momentum), hence it may be considered as zero-energy nonlinearity. Direct simulations demonstrate generation of trains of stochastically interacting chiral solitons by MI. In the ring-shaped setup, the MI creates a single traveling solitary wave. The sign of the current nonlinearity determines the direction of propagation of the emerging solitons.
description: 9 pages,8 figures, To be published in Physical Review E
Προστατευτικός ρόλος του δάσους του Σέιχ Σου: ανασύνταξη και ανασχεδιασμός υποδομών. Σύνδεση με την πόλη
Creators: name: Σταυρινού, Βάγια Δημητρίου
Publisher: name: Aristotle University of Thessaloniki
Year: 2016
Subjects: μέτωπο Σέιχ Σου-Παραλία, συνδεσιμότητα
αστικό πράσινο, χώροι αναψυχής, αποκατάσταση
αισθητική αναβάθμιση, λειτουργική ανασύνταξη
front Seih-Sou-Beach, connectivity
urban greenery, recreation areas, restoration
design enhancement, functional recast

description: Ο κύριος σκοπός της εργασίας είναι ο προσδιορισμός του προστατευτικού ρόλου που παίζει το περιαστικό δάσος του Σέιχ Σου σε σχέση με την πόλη της Θεσσαλονίκης σε συνδυασμό με τον αναψυχικό του ρόλο. Στο πλαίσιο των ρόλων αυτών θα γίνουν προτάσεις για την ανασύνταξη των αναψυχικών υποδομών. Οι προτάσεις ανασχεδιασμού αφορούν την αισθητική και λειτουργική ανασύνταξή των ήδη υπάρχοντων χώρων αναψυχής. Το δεύτερο σκέλος αφορά τη σύνδεση του περιαστικού δάσους με το αστικό πράσινο της Θεσσαλονίκης. Αυτή η σύνδεση θα έχει ως αποτέλεσμα τη δημιουργία ενός πράσινου διαδρόμου, ο οποίος θα ξεκινάει από το Σέιχ Σου και θα καταλήγει στην παραλία. Πιο συγκεκριμένα, αυτός ο πράσινος διάδρομος θα περιλαμβάνει τα εξής πάρκα και περιοχές πρασίνου της Θεσσαλονίκης: Επταπύργιο, Περιοχή Τειχών, Πάρκο Κήποι του Πασά, Νεκροταφείο Ευαγγελίστρια, Πάρκο Πανεπιστημιούπολης, Περιοχή ΔΕΘ, Πάρκο ΧΑΝΘ, Παραλία. Τελικά, ως εφικτές λύσεις στην παρούσα κατάσταση της άναρχης και πυκνής δόμησης προτείνονται η δημιουργία πεζογέφυρας για την αποκατάσταση της συνδεσιμότητας του αστικού με το περιαστικό πράσινο, πεζοδιαδρομές και ποδηλατόδρομοι που θα δώσουν τη δυνατότητα περιπάτου και πεζοπορίας στους κατοίκους με τη μικρότερη δυνατή όχληση από την κυκλοφορία των αυτοκινήτων και τη ρύπανση. Ακόμη, προτείνεται η αύξηση του πρασίνου με φυτεύσεις.
description: The main purpose of this study is to determine the protective role played by the suburban forest of Seih-Sou in relation to the city of Thessaloniki in conjunction with his role of urban-recreation. Within these roles it will be made proposals for the recasting of the recreational infrastructure. These proposals concern the aesthetic and functional rearrangement of the already existing recreation areas. A second part of this work concerns the connection of the suburban forest with the urban greenery of Thessaloniki. This link will result in the creation of a green corridor, who will start from Seih-Sou and leads to the beach. More specifically, this green corridor would include parks and green areas of Thessaloniki: Eptapyrgio, Area of the Walls, Park Pasha- Gardens, Cemetery of Evangelistria, Park of University-campus, Area of “Ekthesis”, Park of “ΧΑΝΘ”, Beach. Finally, as possible solutions to the current situation of unregulated and dense housing is proposed the creation of a footbridge to restore connectivity of urban to suburban green, pedestrian-routes and bike paths that will enable walking and hiking to residents with minimal disturbance from traffic of cars and pollution. It is also proposed to increase the urban vegetation with plantings.
Perturbed Three Vortex Dynamics
Creators: name: Blackmore, Denis
name: Ting, Lu
name: Knio, Omar
Publisher: name: arXiv
Year: 2006
Subjects: subject: Dynamical Systems (math.DS)
subject: Mathematical Physics (math-ph)
subject: FOS: Mathematics
subject: FOS: Physical sciences
subject: 37J40; 76B47

description: It is well known that the dynamics of three point vortices moving in an ideal fluid in the plane can be expressed in Hamiltonian form, where the resulting equations of motion are completely integrable in the sense of Liouville and Arnold. The focus of this investigation is on the persistence of regular behavior (especially periodic motion) associated to completely integrable systems for certain (admissible) kinds of Hamiltonian perturbations of the three vortex system in a plane. After a brief survey of the dynamics of the integrable planar three vortex system, it is shown that the admissible class of perturbed systems is broad enough to include three vortices in a half-plane, three coaxial slender vortex rings in three-space, and `restricted' four vortex dynamics in a plane. Included are two basic categories of results for admissible perturbations: (i) general theorems for the persistence of invariant tori and periodic orbits using Kolmogorov-Arnold-Moser and Poincare-Birkhoff type arguments; and (ii) more specific and quantitative conclusions of a classical perturbation theory nature guaranteeing the existence of periodic orbits of the perturbed system close to cycles of the unperturbed system, which occur in abundance near centers. In addition, several numerical simulations are provided to illustrate the validity of the theorems as well as indicating their limitations as manifested by transitions to chaotic dynamics.
description: 26 pages, 9 figures, submitted to the Journal of Mathematical Physics
Including topology change in Loop Quantum Gravity with topspin network formalism with application to homogeneous and isotropic cosmology
Creators: name: Villani, Mattia
Publisher: name: arXiv
Year: 2021
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: We apply topspin network formalism to Loop Quantum Gravity in order to include in the theory the possibility of changes in the topology of spacetime. We apply this formalism to three toy models: with the first, we find that the topology can actually change due to the action of the Hamiltonian constraint and with the second we find that the final state might be a superposition of states with different topologies. In the third and last application, we consider an homogeneous and isotropic Universe, calculating the difference equation that describes the evolution of the system and which are the final topological states after the action of the Hamiltonian constraint. For this last case, we also calculate the transition amplitudes and probabilities from the initial to the final states.
description: Accepted for the pubblication on Class. Quantum Grav
Observation of the Faraday effect via beam deflection in a longitudinal magnetic field
Creators: name: Ghosh, Ambarish
name: Fischer, Peer
Publisher: name: arXiv
Year: 2007
Subjects: subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: We report the observation of the magnetic field induced circular differential deflection of light at the interface of a Faraday medium. The difference in the angles of refraction or reflection between the two circular polarization components is a function of the magnetic field strength and the Verdet constant. The reported phenomena permit the observation of the Faraday effect not via polarization rotation in transmission, but via changes in the propagation direction in refraction or in reflection. An unpolarized light beam is predicted to split into its two circular polarization components. The light deflection arises within a few wavelengths at the interface and is therefore independent of pathlength.
Mitigating severe over-parameterization in deep convolutional neural networks through forced feature abstraction and compression with an entropy-based heuristic
Creators: name: Gowdra, Nidhi
name: Sinha, Roopak
name: MacDonell, Stephen
name: Yan, Wei Qi
Publisher: name: arXiv
Year: 2021
Subjects: subject: Computer Vision and Pattern Recognition (cs.CV)
subject: Machine Learning (cs.LG)
subject: FOS: Computer and information sciences

description: Convolutional Neural Networks (CNNs) such as ResNet-50, DenseNet-40 and ResNeXt-56 are severely over-parameterized, necessitating a consequent increase in the computational resources required for model training which scales exponentially for increments in model depth. In this paper, we propose an Entropy-Based Convolutional Layer Estimation (EBCLE) heuristic which is robust and simple, yet effective in resolving the problem of over-parameterization with regards to network depth of CNN model. The EBCLE heuristic employs a priori knowledge of the entropic data distribution of input datasets to determine an upper bound for convolutional network depth, beyond which identity transformations are prevalent offering insignificant contributions for enhancing model performance. Restricting depth redundancies by forcing feature compression and abstraction restricts over-parameterization while decreasing training time by 24.99% - 78.59% without degradation in model performance. We present empirical evidence to emphasize the relative effectiveness of broader, yet shallower models trained using the EBCLE heuristic, which maintains or outperforms baseline classification accuracies of narrower yet deeper models. The EBCLE heuristic is architecturally agnostic and EBCLE based CNN models restrict depth redundancies resulting in enhanced utilization of the available computational resources. The proposed EBCLE heuristic is a compelling technique for researchers to analytically justify their HyperParameter (HP) choices for CNNs. Empirical validation of the EBCLE heuristic in training CNN models was established on five benchmarking datasets (ImageNet32, CIFAR-10/100, STL-10, MNIST) and four network architectures (DenseNet, ResNet, ResNeXt and EfficientNet B0-B2) with appropriate statistical tests employed to infer any conclusive claims presented in this paper.
description: Journal paper, 14 pages, 3 tables, 3 figures
The interplay between discrete noise and nonlinear chemical kinetics in a signal amplification cascade
Creators: name: Lan, Yueheng
name: Papoian, Garegin A.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Molecular Networks (q-bio.MN)
subject: Quantitative Methods (q-bio.QM)
subject: FOS: Biological sciences

description: We used various analytical and numerical techniques to elucidate signal propagation in a small enzymatic cascade which is subjected to external and internal noise. The nonlinear character of catalytic reactions, which underlie protein signal transduction cascades, renders stochastic signaling dynamics in cytosol biochemical networks distinct from the usual description of stochastic dynamics in gene regulatory networks. For a simple 2-step enzymatic cascade which underlies many important protein signaling pathways, we demonstrated that the commonly used techniques such as the linear noise approximation and the Langevin equation become inadequate when the number of proteins becomes too low. Consequently, we developed a new analytical approximation, based on mixing the generating function and distribution function approaches, to the solution of the master equation that describes nonlinear chemical signaling kinetics for this important class of biochemical reactions. Our techniques work in a much wider range of protein number fluctuations than the methods used previously. We found that under certain conditions the burst-phase noise may be injected into the downstream signaling network dynamics, resulting possibly in unusually large macroscopic fluctuations. In addition to computing first and second moments, which is the goal of commonly used analytical techniques, our new approach provides the full time-dependent probability distributions of the colored non-Gaussian processes in a nonlinear signal transduction cascade.
description: 16 pages, 9 figures
Equations of motion approach to decoherence and current noise in ballistic interferometers coupled to a quantum bath
Creators: name: Marquardt, Florian
Publisher: name: arXiv
Year: 2006
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: We present a technique for treating many particles moving inside a ballistic interferometer, under the influence of a quantum-mechanical environment (phonons, photons, Nyquist noise etc.). Our approach is based on solving the coupled Heisenberg equations of motion of the many-particle system and the bath and is inspired by the quantum Langevin method known for the Caldeira Leggett model. It allows to study decoherence and the influence of the bath on other properties of the interferometer. As a first application, we treat a fermionic Mach-Zehnder interferometer. In particular, we discuss the dephasing rate and present full analytical expressions for the leading corrections to the current noise, brought about by the coupling to the quantum bath.
description: 10 pages, 7 figures
From tunneling to contact: Inelastic signals in an atomic gold junction
Creators: name: Frederiksen, Thomas
name: Lorente, Nicolas
name: Paulsson, Magnus
name: Brandbyge, Mads
Publisher: name: arXiv
Year: 2007
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: The evolution of electron conductance in the presence of inelastic effects is studied as an atomic gold contact is formed evolving from a low-conductance regime (tunneling) to a high-conductance regime (contact). In order to characterize each regime, we perform density functional theory (DFT) calculations to study the geometric and electronic structures, together with the strength of the atomic bonds and the associated vibrational frequencies. The conductance is calculated by first evaluating the transmission of electrons through the system, and secondly by calculating the conductance change due to the excitation of vibrations. As found in previous studies [Paulsson et al., Phys. Rev. B. 72, 201101(R) (2005)] the change in conductance due to inelastic effects permits to characterize the crossover from tunneling to contact. The most notorious effect being the crossover from an increase in conductance in the tunneling regime to a decrease in conductance in the contact regime when the bias voltage matches a vibrational threshold. Our DFT-based calculations actually show that the effect of vibrational modes in electron conductance is rather complex, in particular when modes localized in the contact region are permitted to extend into the electrodes. As an example, we find that certain modes can give rise to decreases in conductance when in the tunneling regime, opposite to the above mentioned result. Whereas details in the inelastic spectrum depend on the size of the vibrational region, we show that the overall change in conductance is quantitatively well approximated by the simplest calculation where only the apex atoms are allowed to vibrate. Our study is completed by the application of a simplified model where the relevant parameters are obtained from the above DFT-based calculations.
description: 8 pages, 5 figures
Open, Sesame! Introducing Access Control to Voice Services
Creators: name: Woszczyk, Dominika
name: Lee, Alvin
name: Demetriou, Soteris
Publisher: name: arXiv
Year: 2021
Subjects: subject: Cryptography and Security (cs.CR)
subject: Systems and Control (eess.SY)
subject: FOS: Computer and information sciences
subject: FOS: Electrical engineering, electronic engineering, information engineering

description: Personal voice assistants (VAs) are shown to be vulnerable against record-and-replay, and other acoustic attacks which allow an adversary to gain unauthorized control of connected devices within a smart home. Existing defenses either lack detection and management capabilities or are too coarse-grained to enable flexible policies on par with other computing interfaces. In this work, we present Sesame, a lightweight framework for edge devices which is the first to enable fine-grained access control of smart-home voice commands. Sesame combines three components: Automatic Speech Recognition, Natural Language Understanding (NLU) and a Policy module. We implemented Sesame on Android devices and demonstrate that our system can enforce security policies for both Alexa and Google Home in real-time (362ms end-to-end inference time), with a lightweight (<25MB) NLU model which exhibits minimal accuracy loss compared to its non-compact equivalent.
description: 6 pages, to appear in the 1st Workshop on Security and Privacy for Mobile AI (MAISP'21) - co-located with ACM MobiSys 2021
Getting to know them : characters labelled as mentally disabled in ten Canadian short stories and novels
Creators: name: Williams, Allan James
Publisher: name: University of British Columbia
Year: 2008

description: This thesis is a study of the treatment of mental disability in Canadian literature. Literature reflects the perceptions and practises of the culture of which it is a part. Radical changes have been made in recent years in the thinking about persons with mental handicaps. The issue of whether the changes are reflected in literature prompted the writing of this thesis. Little is known about characters labelled as mentally disabled in non-didactic, Canadian Literature. They are not commonly discussed in the academic journals of Canadian Literature and Education. The purpose of this thesis was to get to know ten of the above characters. The following questions were drawn from issues in the academic literature regarding mental disability. All seven questions were applied to each character in turn. (1) Label? (2) Personal relationships? (3) Thoughts and feelings? (4) Choices? (5) Daily activity? (6) Relationship with service providers? (7) Personal assets and abilities? Short story characters: Benny Parry, "The Time of Death," Munro, 1968; Dolores Boyle, "Dance of the Happy Shades," Munro, 1968; Kelvin, "Circle of Prayer," Munro, 1986; Neddy Baker, "Hello Cheeverland, Goodbye," Findley, 1984; Stella Bragg, "Bragg and Minna," Findley, 1988. Characters from novels: Francis Cornish, "What's Bred in the Bone," Davies, 1985; John-Gustav Skandl, "What the Crow Said," Kroetsch, 1978; Lotte, "Not Wanted on the Voyage," Findley, 1984; Rowena Ross, "The Wars," Findley, 1977; Tehmul Lungraa, "Such a Long Journey," Mistry, 1991. Findings indicated that Canadian literature is not yet reflecting the new movement to develop full personhood. Most characters were limited in the choices they made. A variety of labels were used. Little was said about what the characters think or feel. No characters were married, had children, or a job. Most of the characters had a personal relationship with another character.
Grammatical elicitation: Verb paradigms
Creators: name: Palacio, Frank
name: Robertson, Allegra
Publisher: name: California Language Archive, University of California, Berkeley
Year: 2022
Subjects: subject: cab

description: Covers stative and active intransitive and transitive verbs in immediate past, non-progressive contexts. Verbs are elicited with positive and negative polarity, and in declarative, interrogative, and directive moods.
Dark matter sterile neutrinos in stellar collapse: alteration of energy/lepton number transport and a mechanism for supernova explosion enhancement
Creators: name: Hidaka, Jun
name: Fuller, George M.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We investigate matter-enhanced Mikheyev-Smirnov-Wolfenstein (MSW) active-sterile neutrino conversion in the $ν_e \rightleftharpoons ν_s$ channel in the collapse of the iron core of a pre-supernova star. For values of sterile neutrino rest mass $m_s$ and vacuum mixing angle $θ$ (specifically, $0.5 {\rm keV}< m_s<10 {\rm keV}$ and $\sin^22θ> 5\times{10}^{-12}$) which include those required for viable sterile neutrino dark matter, our one-zone in-fall phase collapse calculations show a significant reduction in core lepton fraction. This would result in a smaller homologous core and therefore a smaller initial shock energy, disfavoring successful shock re-heating and the prospects for an explosion. However, these calculations also suggest that the MSW resonance energy can exhibit a minimum located between the center and surface of the core. In turn, this suggests a post-core-bounce mechanism to enhance neutrino transport and neutrino luminosities at the core surface and thereby augment shock re-heating: (1) scattering-induced or coherent MSW $ν_e\toν_s$ conversion occurs deep in the core, at the first MSW resonance, where $ν_e$ energies are large ($\sim 150$ MeV); (2) the high energy $ν_s$ stream outward at near light speed; (3) they deposit their energy when they encounter the second MSW resonance $ν_s\toν_e$ just below the proto-neutron star surface.
description: 13 pages, 9 figures
Convolution of convex valuations
Creators: name: Bernig, Andreas
name: Fu, Joseph H. G.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Differential Geometry (math.DG)
subject: FOS: Mathematics
subject: 53C65; 52A22

description: We show that the natural "convolution" on the space of smooth, even, translation-invariant convex valuations on a euclidean space $V$, obtained by intertwining the product and the duality transform of S. Alesker, may be expressed in terms of Minkowski sum. Furthermore the resulting product extends naturally to odd valuations as well. Based on this technical result we give an application to integral geometry, generalizing Hadwiger's additive kinematic formula for $SO(V)$ to general compact groups $G \subset O(V)$ acting transitively on the sphere: it turns out that these formulas are in a natural sense dual to the usual (intersection) kinematic formulas.
description: 18 pages; Thm. 1.4. added; references updated; other minor changes; to appear in Geom. Dedicata
Origin of resonances in the chiral unitary approach
Creators: name: Hyodo, Tetsuo
name: Jido, Daisuke
name: Hosaka, Atsushi
Publisher: name: arXiv
Year: 2008
Subjects: subject: Nuclear Theory (nucl-th)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We study the origin of the resonances associated with pole singularities of the scattering amplitude in the chiral unitary approach. We propose a "natural renormalization" scheme using the low-energy interaction and the general principle of the scattering theory. We develop a method to distinguish dynamically generated resonances from genuine quark states [Castillejo-Dalitz-Dyson (CDD) poles] using the natural renormalization scheme and phenomenological fitting. Analyzing physical meson-baryon scatterings, we find that the Lambda(1405) resonance is largely dominated by the meson-baryon molecule component. In contrast, the N(1535) resonance requires a sizable CDD pole contribution, while the effect of the meson-baryon dynamics is also important.
description: RevTeX4, 14 pages, 4 figures, 4 tables, title changed by editors, final version to appear in Phys. Rev. C