Aging in coherent noise models and natural time

Event correlation between aftershocks in the coherent noise model is studied by making use of natural time, which has recently been introduced in complex time-series analysis. It is found that the aging phenomenon and the associated scaling property discovered in the observed seismic data are well reproduced by the model. It is also found that the scaling function is given by the $q$-exponential function appearing in nonextensive statistical mechanics, showing power-law decay of event correlation in natural time.Comment: 4 pages and 5 figure

On classification of Poisson vertex algebras

We describe a conjectural classification of Poisson vertex algebras of CFT type and of Poisson vertex algebras in one differential variable (= scalar Hamiltonian operators)

A model for assessing the systemic vulnerability in landslide prone areas

Abstract. The objectives of spatial planning should include the definition and assessment of possible mitigation strategies regarding the effects of natural hazards on the surrounding territory. Unfortunately, however, there is often a lack of adequate tools to provide necessary support to the local bodies responsible for land management. This paper deals with the conception, the development and the validation of an integrated numerical model for assessing systemic vulnerability in complex and urbanized landslide-prone areas. The proposed model considers this vulnerability not as a characteristic of a particular element at risk, but as a peculiarity of a complex territorial system, in which the elements are reciprocally linked in a functional way. It is an index of the tendency of a given territorial element to suffer damage (usually of a functional kind) due to its interconnections with other elements of the same territorial system. The innovative nature of this work also lies in the formalization of a procedure based on a network of influences for an adequate assessment of such "systemic" vulnerability. This approach can be used to obtain information which is useful, in any given situation of a territory hit by a landslide event, for the identification of the element which has suffered the most functional damage, ie the most "critical" element and the element which has the greatest repercussions on other elements of the system and thus a "decisive" role in the management of the emergency. This model was developed within a GIS system through the following phases: 1. the topological characterization of the territorial system studied and the assessment of the scenarios in terms of spatial landslide hazard. A statistical method, based on neural networks was proposed for the assessment of landslide hazard; 2. the analysis of the direct consequences of a scenario event on the system; 3. the definition of the assessment model of systemic vulnerability in landslide-prone areas. To highlight the potentialities of the proposed approach we have described a specific case study of landslide hazard in the local council area of Potenza

Quasiparticle Electronic structure of Copper in the GW approximation

We show that the results of photoemission and inverse photoemission experiments on bulk copper can be quantitatively described within band-structure theory, with no evidence of effects beyond the single-quasiparticle approximation. The well known discrepancies between the experimental bandstructure and the Kohn-Sham eigenvalues of Density Functional Theory are almost completely corrected by self-energy effects. Exchange-correlation contributions to the self-energy arising from 3s and 3p core levels are shown to be crucial.Comment: 4 pages, 2 figures embedded in the text. 3 footnotes modified and 1 reference added. Small modifications also in the text. Accepted for publication in PR

Inovasi Pembelajaran Elektronik dan Tantangan Guru Abad 21

[Title: Electronic Learning Innovations and 21st Century Teacher Challenges]. The development of information technology that is very rapid in this century has a very significant impact on the world of education, where, the process of transition from the age of industrialization to the age of knowledge requires every field in life to change very quickly and must be able to adapt quickly. Entering the 21st-century technological advances have entered into various aspects of life, including education. Teachers and students, lecturers and students, educators and students are required to have the ability to teach in this 21st century. A number of challenges and opportunities must be faced by students and teachers in order to survive in the age of knowledge that is coloured by the emergence of various educational innovations. One innovation that is developing quite rapidly is electronic learning (electronic learning) or e-learning. E-learning is distance learning (distance learning) that utilizes computer technology, computer networks and/or the internet. This electronic learning innovation allows learners to learn through computers in their respective places without having to physically go to attend classes/lectures in class. Therefore, educators and prospective educators in the 21st century need to be prepared to be able to adapt to the development of science and technology. Teacher Training Institute (LPTK) as an institution producing prospective educators/teachers needs to equip teachers and prospective teachers to skillfully use technology, especially ICT, because of the challenges of future teachers related to ICT. In an effort to prepare prospective teachers entering the 21st century, STKIP Weetebula as one of the LPTKs in Indonesia seeks to equip its students by including e-learning courses in the curriculum of elementary school teacher education study programs (PGSD)

E-Learning Moodle, Media Pembelajaran Fisika Abad 21

[Title: Moodle E-Learning, the 21st Century Physics Learning Media] A distinctive characteristic of 21st-century learning is digital communication, meaning that the learning process is no longer face to face course between teachers and students but is more of an internet-based (e-learning) modern learning. The process of implementing e-learning requires a Learning Management System (LMS) which functions to regulate the management of learning. One of the LMS that can be used in organizing e-learning learning is moodle. Moodle e-learning can be used as a medium to improve the quality of interactive learning and support for the implementation of blended learning. Through e-learning moodle learning material can be accessed anytime and anywhere, besides that the material can be enriched with various learning resources including multimedia, which can be quickly updated by the instructor. In addition, the facilities offered in moodle e-learning learning are able to display learning materials that are abstract in nature into material that can be witnessed in person. Material samples that are mostly abstract are material on physics subjects. Therefore, moodle electronic learning is expected to be able to help students master the concepts in physics learning

Some algebraic properties of differential operators

First, we study the subskewfield of rational pseudodifferential operators over a differential field K generated in the skewfield of pseudodifferential operators over K by the subalgebra of all differential operators. Second, we show that the Dieudonne' determinant of a matrix pseudodifferential operator with coefficients in a differential subring A of K lies in the integral closure of A in K, and we give an example of a 2x2 matrix differential operator with coefficients in A whose Dieudonne' determiant does not lie in A.Comment: 15 page