Structural Changes in Data Communication in Wireless Sensor Networks

Wireless sensor networks are an important technology for making distributed autonomous measures in hostile or inaccessible environments. Among the challenges they pose, the way data travel among them is a relevant issue since their structure is quite dynamic. The operational topology of such devices can often be described by complex networks. In this work, we assess the variation of measures commonly employed in the complex networks literature applied to wireless sensor networks. Four data communication strategies were considered: geometric, random, small-world, and scale-free models, along with the shortest path length measure. The sensitivity of this measure was analyzed with respect to the following perturbations: insertion and removal of nodes in the geometric strategy; and insertion, removal and rewiring of links in the other models. The assessment was performed using the normalized Kullback-Leibler divergence and Hellinger distance quantifiers, both deriving from the Information Theory framework. The results reveal that the shortest path length is sensitive to perturbations.Comment: 12 pages, 4 figures, Central European Journal of Physic

Classical properties of algebras using a new graph association

We study the relation between algebraic structures and Graph Theory. We have defined five different weighted digraphs associated to a finite dimensional algebra over a field in order to tackle important properties of the associated algebras, mainly the nilpotency and solvability in the case of Leibniz algebras

Pengaruh Kecerdasan Emosional terhadap Tingkat Pemahaman Akuntansi Ditinjau dari Perspektif Gender

Penelitian ini bertujuan untuk menguji pengaruh kecerdasan emosional yaitupengenalan diri, pengendalian diri, motivasi, empati dan keterampilan sosialterhadap tingkat pemahaman akuntansi ditinjau dari perspektif gender padamahasiswa akuntansi baik secara parsial maupun simultan.Penelitian inimenggunakan metode verifikatif sementara populasi dalam penelitian ini adalahmahasiswa akuntansi pada level strata satu pada Universitas Negeri dan Swasta diKota Pekanbaru. Sampel penelitian ini berjumlah 284 mahasiswa akuntansi yangdiseleksi dengan metode purposive sampling dan convenience sampling. Analisisdata yang digunakan adalah model regresi berganda baik uji-t maupun uji-F. Hasildari penelitian ini menunjukkan bahwa Motivasi berpengaruh terhadap tingkatpemahaman akuntansi. Semakin tinggi tingkat motivasi mahasiswa tersebut makaakan semakin meningkat pula tingkat pemahamannya terhadap matakuliahakuntansi. Pengendalian diri berpengaruh terhadap tingkat pemahamanakuntansinya. Semakin sering kita mengarahkan maka akan semakin meningkatpengendalian diri mahasiswi tersebut dan ini akan berakibat kepada semakinmeningkatnya tingkat pemahaman terhadap matakuliah akuntansi.Secara simultanbaik mahasiswa laki-laki maupun mahasiswa perempuan bahwa pengenalan diri,pengendalian diri, motivasi,empati dan keterampilan social berpengaruh terhadaptingkat pemahaman akuntansi. Pengaruh Emosional question yang diukur denganvariable pengenalan diri, pengendalian diri, motivasi, empati dan keterampilan socialterhadap tingkat pemahaman mahasiswa untuk matakuliah akuntansi sangat kecilyaitu hanya berkisar 12% sampai dengan 17 % sedangkan factor lain yang tidakdiukur dalam penelitian ini sangat besar pengaruhnya

Thermal treatment of superconductor thin film of the BSCCO system using domestic microwave oven

In this work, we report the preparation of a superconductor thin film of the BSCCO system using a good quality powder with nominal composition Bi_{1.8}Pb_{0.4}Sr_2CaCu_2O_x which was thermally treated using a domestic microwave oven (2.45 GHz, 800 W). This film was grew on a single crystal of LaAlO_3(100) substrate and exhibited a crystalline structure with the c-axis perpendicular to the plane of the substrate. An onset superconducting transition temperature was measured at 80 K.Comment: 4 pages, 5 figure

Management of the Rice Tungro Virus Vector \u3ci\u3eNephotettix virescens\u3c/i\u3e (Homoptera: Cicadellidae) with Controlled-Release Formulations of Carbofuran

Field trials were conducted in lowland flooded rice in the Philippines to evaluate a number of carbofuran controlled-release formulations in comparison with commercial formulations. The test formulations were based on a biodegradable matrix of pine kraft lignin and were used as granules of different sizes and also in the form of small strips. The release rates were assessed under field conditions by bioassaying rice plants in the field, using adult rice green leafhopper, Nephotettix virescens Distant. The lignin formulations with a high level of active ingredient (15–45% by weight) gave as good or better control than the commercial 3% granules in tests based on three application techniques: broadcast into the floodwater, soil incorporation, and root zone injection. The improvements in control levels of green leafhoppers were most marked with soil incorporation and root zone application. The best lignin-based formulation reduced levels of tungro virus infection from 23% for a conventional flowable carbofuran formulation to 1.0% at an application rate of 0.5 kg (AI)/ha. At the same rate, the grain yield was increased from 3.56 t/ha to 5.5 t/ha, using the controlled-released formulation

Characterization of Vehicle Behavior with Information Theory

This work proposes the use of Information Theory for the characterization of vehicles behavior through their velocities. Three public data sets were used: i.Mobile Century data set collected on Highway I-880, near Union City, California; ii.Borl\"ange GPS data set collected in the Swedish city of Borl\"ange; and iii.Beijing taxicabs data set collected in Beijing, China, where each vehicle speed is stored as a time series. The Bandt-Pompe methodology combined with the Complexity-Entropy plane were used to identify different regimes and behaviors. The global velocity is compatible with a correlated noise with f^{-k} Power Spectrum with k >= 0. With this we identify traffic behaviors as, for instance, random velocities (k aprox. 0) when there is congestion, and more correlated velocities (k aprox. 3) in the presence of free traffic flow

Agricultura de montanha: uma prioridade latente na agenda da pesquisa brasileira.

Introdução; Breve histórico do reconhecimento da importância das montanhas; Definição de montanha; Especialidades dos ambientes de montanha; Desenvolvimento sustentável em ambientes de montanha; Agricultura de montanha; Considerações finais

Pagamento por serviços ambientais em ambientes de montanha

Publicado no Cadernos de Agroecologia, v. 6, n. 2, 2011