12,639 research outputs found
Direct summands of direct sums of modules whose endomorphism rings have two maximal right ideals
No full textAbstractLet M1,…,Mn be right modules over a ring R. Suppose that the endomorphism ring EndR(Mi) of each module Mi has at most two maximal right ideals. Is it true that every direct summand of M1⊕⋯⊕Mn is a direct sum of modules whose endomorphism rings also have at most two maximal right ideals? We show that the answer is negative in general, but affirmative under further hypotheses. The endomorphism ring of uniserial modules, that is, the modules whose lattice of submodules is linearly ordered under inclusion, always has at most two maximal right ideals, and Pavel Příhoda showed in 2004 that the answer to our question is affirmative for direct sums of finitely many uniserial modules
Weak Krull-Schmidt for Infinite Direct Sums of Cyclically Presented Modules over Local Rings
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Equivalence of Diagonal Matrices over Local Rings
No full textIt is proved that two diagonal matrices diag(a_1,...,a_n) and diag(b_1,...,b_n) over a local ring R are equivalent if and only if there are two permutations σ,τ of {1,2,...,n} such that l[R/aiR]=l[R/bσ(i)R] and e[R/aiR]=e[R/bτ(i)R] for every i=1,2,...,n. Here e[R/aR] denotes the epigeny class of R/aR, and l[R/aR] denotes the lower part of R/aR. In some particular cases, like for instance in the case of R local commutative, diag(a_1,...,a_n) is equivalent to diag(b_1,...,b_n) if and only if there is a permutation σ of {1,2,...,n} with a_iR=b_{σ(i)}R for every i=1,...,n. These results are obtained studying the direct-sum decompositions of finite direct sums of cyclically presented modules over local rings. The theory of these decompositions turns out to be incredibly similar to the theory of direct-sum decompositions of finite direct sums of uniserial modules over arbitrary rings
Mobility enhancement and assessment for a visual prosthesis
No full textThis paper investigates methods of processing mobility related static images to enhance the effectiveness of a visual prosthesis system. Eight images were processed into 50x50 pixel binary, greyscale, Sobel and Canny edge detected images. 10 subjects were asked 5 mobility related identification tasks for each (randomly ordered) image. Results indicate that edge detection may be useful at this resolution. However, there was not a significant difference found between the results achieved using the Canny and Sobel algorithms. These results support the development of an adaptive device. A mobility display framework has been proposed to assist in this development. Future work will focus on processing image sequences and the development of a visual prosthesis simulation device
Zooplankton abundance in Amini and Kadmat islands of Lakshadweep
No full textStudies on zooplankters collected from the lagoons of Amini and Kadmat islands of Lakshadweep Archipelago were carried out based on a survey conducted during January - February, 2014. The displacement volume ofzooplankton in Amini and Kadmat were 58.35 and 15ml per 100 m3 respectively. The density was also higher in Amini than in Kadmat which is estimated as 64480 and 47726 numbers per 100 m3 respectively. A total of twentyone groups of zooplankters viz., copepods,ostracods, chaetognaths, Lucifer sp., medusae, doliolids,mysids, tintinnids, euphausiids, appendicularians,siphonophores, cladocera, amphipods, isopods,polychaete larvae, prawn larvae, crab larvae, squilla larvae, molluscan larvae, fish eggs and fish larvae were recorded from these two ecosystems. Groupwise studies indicated the dominance of copepods in Amini forming 40% while in Kadmat, the maximum was contributed by crab larvae (50%). The dominance of crab larvae in Kadmat was due to a swarm of zoea stage of crab at station 2 in the western side of the island.Among the copepods, calanoid copepods contributed the maximum with 71% in Amini and 81% in Kadmat.Followed by the dominance of copepods in Amini,ostracods (33%) and crab larvae (14%) formed major components. In Kadmat, copepods formed the second dominant group which contributed 20% followed by prawn larvae (11%), ostracods (6%) and the share by other groups were less than 5%. Comparative studies on the occurrence of different groups of zooplankters in these two island ecosystems showed that copepods and ostracods were very much higher in Amini than in Kadmat while, crab larvae contributed more in Kadmat which was due to the swarming of zoea stage of crab. Both qualitative and quantitative abundance of zooplankters in these two ecosystems are presentedand discussed
Mahsa Amini protestolarının Türk muhafazakar basınında çerçevelenmesi
No full textBu çalışmada Türkiye'deki muhafazakar gazeteler; Yeni Şafak, Yeni Akit, Milli Gazete ve Türkiye Gazetesi'nin haber sitelerinde Mahsa Amini protestolarının nasıl çerçevelendiği incelenecektir. Araştırma, bu gazetelerin olayları hangi bakış açılarıyla sunduğunu, hangi temalar üzerinden haberleri aktardığını ve kamuoyuna nasıl bir mesaj verdiğini analiz etmeyi amaçlamaktadır. Çalışmada özellikle çatışma, toplumsal düzenin korunması, dış güçlerin müdahalesi ve insan hakları çerçevelerine odaklanılacaktır. Muhafazakâr medyanın protestolar karşısında nasıl bir çerçeveleme stratejisi izlediğini Mahsa Amini protestoları örneğinden yola çıkarak ortaya koymayı hedeflemektedir.This study will examine how the conservative newspapers in Turkey—Yeni Şafak, Yeni Akit, Milli Gazete, and Türkiye Gazetesi—frame the Mahsa Amini protests on their news websites. The research aims to analyze the perspectives from which these newspapers present the events, the themes through which they convey the news, and the messages they communicate to the public. The study will particularly focus on frames related to conflict, law and order, foreign intervention and human rights. The objective is to reveal the framing strategies employed by the conservative media in response to the protests by using the Mahsa Amini protests as a case study
Unraveling the resource puzzle: exploring entrepreneurial resource management and the quest for new venture success
No full textExisting research highlights resource management as a complicated and multifaceted system comprising interdependent components, rather than a collection of independent factors. Nonetheless, the precise influence of resource management approaches on value generation and overall prosperity in new business endeavors, especially within diverse contextual environments, remains unclear. To address this gap, our study adopts a neo-configurational approach to explore how entrepreneurial resource management components (e.g., structuring, bundling, and leveraging) relate to achieving success in start-ups. We also examine the contextual influence of environmental dynamism and munificence on the effectiveness of these resource management strategies. By analyzing a comprehensive sample of over 500 US-based ventures, we develop a theoretical framework that encompasses four distinct resource management strategies. This framework provides insights into the attainment of success across diverse environments, characterized by varying levels of dynamism and munificence. Our study contributes to extant literature by emphasizing that the achievement of a competitive advantage in entrepreneurial firms is contingent upon the alignment of internal resource management strategies with external factors, specifically dynamism and munificence
Ultra Low-Power, Area-Efficient Multiplier Based on Shift-and-Add Architecture
No full textSUB-and-add multipliers have a simpler structure than other types of multipliers and, at the same time, have a lower operating speed. They are suitable for applications where speed is not the first design priority. In this paper, we present a low-power, low-area multiplier with a simplest possible structure based on shift-and-add which can be a good choice for portable applications and medical devices such as a pacemaker, where power reduction and chip area are core issues. The main idea of the article is to use multiplexers and appropriate timing signals. By applying these signals to the multiplexer selection lines, it is possible to achieve the correct output with an n-bit adder and input-output registers during (2n+1) clock pulse. Simulation results of proposed 16*16-bit multiplier using HSPICE in standard 0.18um CMOS technology demonstrate that it has 129ns propagation delay while the corresponding power consumption is 467 mu W
Numerical investigation of indoor thermal comfort and air quality for a multi-purpose hall with various shading and glazing ratios
No full textThis research assesses the effect of outdoor parameters, including solar radiation and shading and glazing configurations, on indoor thermal comfort and air quality in multi-purpose halls in Auckland, New Zealand. The Design of Experiment (DOE) method by using CFD simulation has been utilized for this study. Input parameters are windows length, overhang angle, and overhang length, while output parameters are occupant zone average temperature and mass fraction. The temperature sensitivity to the glazing parameter changes with time, and its maximum occurs at 11:00 and is 95%, while for the shading ones happen at 9:00 and is 50%. The peak of CO2 mass fraction sensitivity to glazing and shading parameters coincides at 9:00 and is 90% and 80, respectively. The variation rate of temperature and CO2 mass fraction VS. Glazing parameter (W.L) is approximately positive on the summer day. However, it has a nonlinear and complex behavior, while the shading one has a sinusoidal behavior. On the other hand, on the winter day, the temperature variation rate is almost linear regarding this factor. The result shows that appropriate shading and glazing situation for each time is different, and for reaching the best comfort, dynamic shading and glazing should be designed. Comfort criteria sensitivity within the school is highly dependent on glazing parameters compared with shading configurations. The temperature can be controlled up to 3 and 1.6 degrees on the summer and winter day, respectively. Finally, it can be concluded that glazing tools can compensate for a significant amount of required heating in the winter days, and shading devices and openings can control the air quality in the school buildings with neglectable overheating
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