Asnakew Mulaw Berihun, Endalkachew Hailu, Yitayew Demessie
et al.
Abstract The limited availability and high cost of synthetic insecticides necessitate the exploration of effective and safe botanical alternatives for ectoparasites control in poultry. This study compared the efficacy and adverse effect profiles of a synthetic acaricide (Diazinon) and two indigenous plant extracts, Tephrosia vogelii and Cissus quadrangularis for flea eradication in chickens. A 3 × 2 factorial experiment in a Completely Randomized Design (CRD) was conducted from April to December 2023. Factors included treatment (three levels: Diazinon, T. vogelii, and C. quadrangularis) and chicken breed (two levels: exotic and local). Each of the six treatment-breed combinations was replicated six times using pens of 10 chickens, totaling 360 chickens sourced from the Burji district. The protocol was approved by the appropriate institution (Ref No. 16.28/2023). Flea load, onset of action, and adverse reactions were meticulously monitored during the trial, and the collected data were entered into Microsoft Excel 2010 and analyzed using SPSS software, version 20. Results indicated a significant difference among treatments (p < 0.001) in eradicating fleas from chickens within 48 h. Diazinon and T. vogelii demonstrated a faster onset of action (mean differences = 6.62 and 12, respectively) compared to C. quadrangularis. Diazinon showed the most severe adverse effects, including blistering, swelling, and diarrhea, occurring in 15% of local and 23.33% of exotic chickens. Exotic breeds showed heightened sensitivity, with a significant treatment-by-breed interaction observed. C. quadrangularis caused moderate irritation (6.7% local, 11.7% exotic) of lower severity and shorter duration (1–2 days) than Diazinon, while T. vogelii showed the minimal adverse effects (1.7% local, 8.3% exotic), limited to transient mild redness with no systemic symptoms. While both botanicals show promise as effective and safer alternatives to synthetic chemicals. The cost-effectiveness analysis showed that Tephrosia vogelii and Cissus quadrangularis are about 88% cheaper ($7 vs. $60) than Diazinon, offering a highly cost-effective, community-based alternative. This finding advocates for the integration of T. vogelii into integrated pest management programs and underscore the critical importance of considering breed susceptibility in treatment protocols. Future research should focus on identifying the active compounds and establishing standardized dosages.
In certain general relativistic time-dependent gravitational fields, free test particles can asymptotically line up relative to fiducial static observers and produce a cosmic jet whose speed approaches the speed of light. Two scenarios for the formation of these purely gravitational jets have thus far been theoretically demonstrated: the double-jet collapse scenario and the wave scenario that involves both a cosmic jet in the general direction of wave propagation as well as a counterjet in the opposite direction. These scenarios are briefly reviewed in this paper. Moreover, to elucidate the process of jet formation in these scenarios, we study the propagation of scalar fields in related gravitational fields in connection with the correspondence between the scalar wave perturbations and the motion of free test particles and null rays.
Pavel Burgert, Petr Šída, František Trampota
et al.
In the 20 years since the important discovery of metabasite quarrying in the Jizerské hory Mountains (northern Bohemia, Czech Republic) a wealth of knowledge has been gathered on this raw material used to make Neolithic polished stone tools. A synthesis of these results now gives a more comprehensive view of how this raw material was employed in different periods and extracted directly at the source sites. The overview is at the same time a springing board for further research. Exploitation of metabasite and its widest spatial distribution was in the Linear Pottery culture (LBK; 5400–5000/4900 BC). In the post-LBK period of regionalisation, the sources of raw materials for the production of polished tools were diversified and the degree of utilisation of Jizera Mountains-type metabasite is demonstrably varied by region.
Auxiliary sciences of history, Prehistoric archaeology
La migración venezolana en los últimos tiempos ha tenido como consecuencia el abandono de las ciudades y la pérdida del uso efectivo de muchas edificaciones, produciéndose un vaciamiento denominado osteoporosis urbana. Ello ha supuesto cambios sustanciales en la dinámica urbana y el sector inmobiliario. En este artículo se revisan experiencias de vaciamiento de ciudades en el mundo y se exploran algunas opciones para reutilizar el inventario urbano venezolano
This study aims to provide a comprehensive overview from various studies in the scope of corporate governance in the Indonesian market using systematic literature review method. This study provide insights about Indonesian corporate governance studies phases, identify gaps, and suggest outlines for future agenda research. There are 37 studies include in this systematic literature review study. The study used after doing an assessment of the quality, based on predetermined criteria. Furthermore, the studies used will be extracted to collect the methodology, theories, characteristics, and results of the research. From this study, we can conclude that in general, Indonesian good corporate governance led companies to improve its financial performance positively. Even the corporate governance code also encourages companies to produce voluntary disclosures in various fields. From this review, a conclusion can be drawn from the research which mentions the results that contradict with the theories and the general results of the research. The gaps in the results are caused by the differences in methodologies, sample, and study period. Further, this condition can be explained by the presence of moderating variables in the form of Indonesia's political and economic conditions.
The Segment Anything Model (SAM) serves as a fundamental model for semantic segmentation and demonstrates remarkable generalization capabilities across a wide range of downstream scenarios. In this empirical study, we examine SAM's robustness and zero-shot generalizability in the field of robotic surgery. We comprehensively explore different scenarios, including prompted and unprompted situations, bounding box and points-based prompt approaches, as well as the ability to generalize under corruptions and perturbations at five severity levels. Additionally, we compare the performance of SAM with state-of-the-art supervised models. We conduct all the experiments with two well-known robotic instrument segmentation datasets from MICCAI EndoVis 2017 and 2018 challenges. Our extensive evaluation results reveal that although SAM shows remarkable zero-shot generalization ability with bounding box prompts, it struggles to segment the whole instrument with point-based prompts and unprompted settings. Furthermore, our qualitative figures demonstrate that the model either failed to predict certain parts of the instrument mask (e.g., jaws, wrist) or predicted parts of the instrument as wrong classes in the scenario of overlapping instruments within the same bounding box or with the point-based prompt. In fact, SAM struggles to identify instruments in complex surgical scenarios characterized by the presence of blood, reflection, blur, and shade. Additionally, SAM is insufficiently robust to maintain high performance when subjected to various forms of data corruption. We also attempt to fine-tune SAM using Low-rank Adaptation (LoRA) and propose SurgicalSAM, which shows the capability in class-wise mask prediction without prompt. Therefore, we can argue that, without further domain-specific fine-tuning, SAM is not ready for downstream surgical tasks.
This progress report examines the relationship between continued growth in the sub-field of labour geography, especially in research on migration, and the concept of precarity. An increasingly dominant frame in critical studies of labour and the employment relation, and resonant in the political sphere within (and now beyond) Europe, precarity has seen slower uptake by geographers. However, research on migrant labour and emerging work on technological change, flexibilization, restructuring and insecurity is employing precarity as a multi-dimensional conceptual framework. In this sense, I argue that the distinction between notions of precarity grounded in political economy and those grounded in political philosophy is increasingly – and productively – blurred. As I illustrate, this blurring is apparent in labour geography’s ongoing and deepening engagement with precarity, yet our distinctive contribution to a spatialized theorization of precarity remains, I argue, an open question.
The article examines the impact of the processes of new industrial development of natural resources of the North on the socio-economic conditions and prospects for long-term development of municipal districts. Particular attention is paid to the problems of administrative management of these territories in the context of the concept of sustainable development, which is especially relevant for resource regions, since with all the benefits received by different actors, an economy based on exhaustible natural resources is limited in development and causes significant damage to the natural environment. The purpose of the article is to determine the features of administrative management in the areas of new industrial development, including the identification of problems and benefits of socio-economic development of Northern municipalities in the context of sustainable development. The research was carried out on the example of the territories of new industrial development of oil and gas resources in the North of the Irkutsk region. The article is based on the materials of field socio-geographical studies conducted in Katangskii, Kirenskii and Ust-Kutskii municipal districts in February and March 2022. The results of field research are supplemented with data from territorial statistics and materials from strategic planning documents, municipal programs, reports of administrations on the socio-economic development of the studied territories. Comparative geographical and statistical methods, as well as general scientific methods of analysis and synthesis are used in the work. It is revealed that the active development of the oil and gas industry in the Northern districts of the Irkutsk region has a positive effect on the dynamics of revenues of district budgets, but, nevertheless, they remain dependent on higher budget systems. The most effective formation of the revenue part of budgets in connection with industrial works is revealed in rural settlements in the territories of which hydrocarbons are extracted, despite the self-sufficiency of these local budgets, the formation of a stable base for long-term development of settlements is limited by the narrow powers of local administrations. As a result, a list of the main problems hindering the effective administrative management of the long-term socio-economic development of the northern municipalities at the local level has been formed.
Dois projetos de otimização, promovidos globalmente, visam responder aos desafios da vida urbana na contemporaneidade. O primeiro é o das Cidades Inteligentes, estruturadas a partir de um aparato tecnológico e informacional que passa a mediar a gestão da cidade, seu consumo e eficiência. O segundo é o das Cidades Amigas do Idoso, estruturadas a partir de ambientes que visam capacitar o crescente contingente idoso para o envelhecimento ativo na cidade. Moldados em um sistema neoliberal, ambos os projetos se apresentam como instâncias emancipadoras do cidadão para o exercício de uma cidadania participativa. Este artigo propõe que as cidades inteligentes demandem novas competências para o envelhecimento ativo na cidade, resultando em desafios para as cidades amigas do idoso no que toca à exclusão e literacia digital. Situando essa discussão no contexto brasileiro, propomos que para os idosos nem um projeto nem outro se realiza integralmente. Entretanto, a partir de uma perspectiva etnográfica, mapeamos como um grupo de idosos de São Paulo constrói uma rede informacional própria, centrada no WhatsApp, que viabiliza instâncias participativas e de pertencimento a partir de uma perspectiva “de baixo”. É nesse descompasso entre projeto e experiência urbanos que apontamos para a emergência de uma cidade acidental, informal, mas inteligente e amiga do idoso.
General Works, Ethnology. Social and cultural anthropology
Long time ago, C.N. Yang proposed a model of noncommutative spacetime that generalized the Snyder model to a curved background. In this paper we review his proposal and the generalizations that have been suggested during the years. In particular, we discuss the most general algebras that contain as subalgebras both de Sitter and Snyder algebras, preserving Lorentz invariance, and are generated by a two-parameter deformation of the canonical Heisenberg algebra. We also define their realizations on quantum phase space, giving explicit examples, both exact and in terms of a perturbative expansion in the deformation parameters.
Massimiliano Pepe, Domenica Costantino, Vincenzo Saverio Alfio
et al.
The aim of the paper is to identify a suitable method for the construction of a 3D city model from stereo satellite imagery. In order to reach this goal, it is necessary to build a workflow consisting of three main steps: (1) Increasing the geometric resolution of the color images through the use of pan-sharpening techniques, (2) identification of the buildings’ footprint through deep-learning techniques and, finally, (3) building an algorithm in GIS (Geographic Information System) for the extraction of the elevation of buildings. The developed method was applied to stereo imagery acquired by WorldView-2 (WV-2), a commercial Earth-observation satellite. The comparison of the different pan-sharpening techniques showed that the Gram–Schmidt method provided better-quality color images than the other techniques examined; this result was deduced from both the visual analysis of the orthophotos and the analysis of quality indices (<i>RMSE</i>, <i>RASE</i> and <i>ERGAS</i>). Subsequently, a deep-learning technique was applied for pan sharpening an image in order to extract the footprint of buildings. Performance indices (<i>precision</i>, <i>recall</i>, <i>overall accuracy</i> and the <i>F</i><sub>1</sub><i>measure</i>) showed an elevated accuracy in automatic recognition of the buildings. Finally, starting from the Digital Surface Model (DSM) generated by satellite imagery, an algorithm built in the GIS environment allowed the extraction of the building height from the elevation model. In this way, it was possible to build a 3D city model where the buildings are represented as prismatic solids with flat roofs, in a fast and precise way.
W artykule omówiono tryb powoływania, kompetencje i uposażenie urzędników centralnych/dworskich Księstwa Szczecińskiego w XVI i w pierwszych dekadach XVII w. Zwrócono uwagę na urząd marszałka nadwornego i jego zastępcy — podmarszałka. Do lat siedemdziesiątych XVI w. kompetencje zbliżone do marszałkowskich miał ochmistrz dworu, którego rolę z czasem sprowadzono do opieki nad fraucymerem
księżnej. Kontrolę nad kancelarią książęcą sprawował kanclerz. Ostatnim z centralnych urzędników Księstwa Szczecińskiego był rentmistrz krajowy, prowadzący nadzór nad prywatną szkatułą władcy.
Archaeology, History (General) and history of Europe
In this paper we discuss generalized group, provides some interesting examples. Further we introduce a generalized module as a module like structure obtained from a generalized group and discuss some of its properties and we also describes generalized module groupoids.
In general relativity the fermions are treated from the perspective of the gauged Lorentz group and by introducing the corresponding gauge fields the spin connection. This procedure is intimately related to the so-called "vielbein" formalism and stems from the general structure that can be associated to a manifold, the affine connection. In this work we derive the correct spin connection based only on the general covariance of the theory, on the gauged Lorentz symmetry and on the known space-time properties of fermion bilinears generalized to the curved space. Our result coincides exactly with the spin connection obtain through the tetrad formalism.
The Sagnac effect can be described as the difference in travel time between two photons traveling along the same path in opposite directions. In this paper we explore the consequences of this characterisation in the context of General Relativity. We derive a general expression for this time difference in an arbitrary space-time for arbitrary paths. In general, this formula is not very useful since it involves solving a differential equation along the path. However, we also present special cases where a closed form expression for the time difference can be given. The main part of the paper deals with the discussion of the effect in a small neighbourhood of an arbitrarily moving observer in their arbitrarily rotating reference frame. We also discuss the special case of stationary space-times and point out the relationship between the Sagnac effect and Fizeau's "aether-drag" experiment.
In the context of the teleparallel equivalent of general relativity the concept of gravitational pressure and gravitational energy-momentum arisen in a natural way. In the case of a Friedmann-Lemaitre-Robertson-Walker space FLRW we obtain the total energy contained inside the apparent horizon and the radial pressure over the apparent horizon area. We use these definitions to written a thermodynamics relation $T_{A}dS_{A} = dE_{A}+P_{A}dV_{A}$ at the apparent horizon, where $E_{A}$ is the total energy inside the apparent horizon, $V_{A}$ is the areal volume of the apparent horizon, $P_{A}$ is the radial pressure over the apparent horizon area, $S_{A}$ is the entropy which can be assumed as one quarter of the apparent horizon area only for a non stationary apparent horizon. We identify $T_{A}$ as the temperature at the surface of the apparent horizon. We shown that for all expanding accelerated FLRW model of universe the radial pressure is positive.
Jose Beltran Jimenez, Lavinia Heisenberg, Tomi Koivisto
The metric-affine variational principle is applied to generate teleparallel and symmetric teleparallel theories of gravity. From the latter is discovered an exceptional class which is consistent with a vanishing affine connection. Based on this remarkable property, this work proposes a simpler geometrical formulation of General Relativity that is oblivious to the affine spacetime structure, thus fundamentally depriving gravity of any inertial character. The resulting theory is described by the Hilbert action purged from the boundary term and is more robustly underpinned by the spin-2 field theory, where an extra symmetry is now manifest, possibly related to the double copy structure of the gravity amplitudes. This construction also provides a novel starting point for modified gravity theories, and the paper presents new and simple generalisations where analytical self-accelerating cosmological solutions arise naturally in the early and late time universe.
Mikhail Slipenchuk, Elena Vorobyevskaya, Segey Kirilov
et al.
Nowadays, the issue of interaction between man and nature is one of the most pressing challenges. One of the aspects of this interaction, as well as one of the prior scientific directions and use of natural resources, is natural resource management. A limited amount of many resources and the limits of environmental capacity of nature raise questions of equity to the interests of different generations, which implies the need to decide on the optimal use of natural resource potential of territories currently and in the future. The complex nature of the relationships that form the structure of resources management as a complex system, dictates the need for a comprehensive approach to its study. System analysis is this type of approach. It allows holding studies of the functions of resources management and identifying problems to its development.
Este artigo descreve as condições do surgimento e da construção de um novo recurso territorial local baseado no desenvolvimento da presença das dunas de areia. Merzouga, no deserto pré-sahariano do sudeste do Marrocos, tornou-se assim um centro mundial do turismo no deserto. A imersão turística na areia (ou o psamoturismo) é em dobro : um turismo de excursão clássico para uma clientela internacional e um turismo de bem-estar que consiste, para os curistas marroquinos, na prática de banhos de areia. O recurso arenoso está vinculado a outros recursos, culturais e identitários, que o ancora localmente e o torna um recurso territorial específico, reconhecido do exterior e controlado localmente. A massificação do psamoturismo, especialmente através da criação de uma “frente do deserto”, ameaça com a banalização dos recursos que marcaram a especificidade e o sucesso deste destino turístico.
In 1912 Josef Strzygowski founded the ‘Section for East Asian Art History’ at the University of Vienna, which attracted many students who would continue their careers in museums and at universities and thus established East Asian art history as an academic field. This paper examines these early art historical engagements with East Asian art: First, I discuss the role of East Asian art in Strzygowski’s agenda of broadening art history’s geographical scope beyond Europe and in his argument about the dominance of ‘Nordic’ artistic traditions in Europe and in Asia. Secondly, I introduce the work of two early students at the ‘Section for East Asian Art History’ in Vienna, Karl With and Alfred Salmony. Their respective approaches to East Asian art exemplify a range of methodological concerns of their time, from stylistic narratives, the concept of ars una, comparative frameworks, to ideas about cultural or national ‘purity’ in the arts, and an interest in cross-cultural adaption and transformation of motifs and symbolism.