Spatial search by continuous-time quantum walks on renormalized Internet networks

Publisher Copyright: © 2022 authors. Published by the American Physical Society. Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI.We study spatial search with continuous-time quantum walks on real-world complex networks. We use smaller replicas of the Internet network obtained with a recent geometric renormalization method introduced by García-Pérez, Nat. Phys. 14, 583 (2018)10.1038/s41567-018-0072-5. This allows us to infer for the first time the behavior of a quantum spatial search algorithm on a real-world complex network. By simulating numerically the dynamics and optimizing the coupling parameter, we study the optimality of the algorithm and its scaling with the size of the network, showing that on average it is considerably better than the classical scaling O(N), but it does not reach the ideal quadratic speedup O(N) that can be achieved, e.g. in complete graphs. However, the performance of the search algorithm strongly depends on the degree of the nodes and, in fact, the scaling is found to be very close to optimal when we consider the nodes below the 99th percentile ordered according to the degree.Peer reviewe

Fatores prognósticos em câncer de cólon localmente avançado tratado com ressecção extendida

The impact of clinical, pathologic, and surgical variables on the postoperative morbidity, mortality, and survival of patients undergoing extended resections of colon carcinoma were evaluated. METHODS: The medical records of 95 patients who underwent extended resections for colon carcinoma between 1953 and 1996 were reviewed. In all cases, in addition to colectomy, 1 or more organs and/or structures were resected en bloc due to a macroscopically based suspicion of tumor invasion. The clinical, pathologic, and surgical parameters were analyzed. Overall survival rates were analyzed according to the method of Kaplan and Meier. Multivariate analysis was performed using the Cox proportional hazards model. RESULTS: Eighty-six patients were treated by curative surgeries and the remaining by palliative resections. Invasion of the organs and/or adjacent structures and regional lymph nodes was found microscopically in 48 and 31 patients, respectively. The median follow-up without postoperative mortality was 47.7 months. The 5-year overall survival rates was 52.6%. The 5-year overall survival rates for patients undergoing curative and palliative surgeries was 58.3% and 0%, respectively. The mean survival time in the palliative surgery group was 3.1 months. Multivariate analysis showed that Karnofsky performance status was strongly related to the risk of postoperative complications (P = .01), and postoperative deaths were associated with the type of surgery and Karnofsky performance status at the time of admission (P = .001). CONCLUSIONS: Some patients with locally advanced colon adenocarcinomas undergoing extended resections have a 5-year overall survival rates of 58.3%. Patients could benefit from palliative-intent procedures, but these measures should cautiously be indicated and avoided in patients with low Karnofsky performance status due to high rates of postoperative mortality and poor survival.Foi avaliado o impacto de variáveis clínicas, patológicas e cirúrgicas na morbidade e mortalidade pós operatórias de pacientes submetidos à ressecção extendida de carcinoma do cólon. MÉTODOS: Prontuários médicos de 95 pacientes submetidos á ressecção extendida de carcinoma de cólon entre os anos de 1953 e 1996 foram revisados. Em todos os casos, além de colectomia, um ou mais órgãos e/ou estruturas foram ressecados em bloco devido á suspeição de invasão tumoral macroscópica. As variáveis clínicas, patológicas e cirúrgicas foram analizadas. As taxas de sobrevida global foram analizadas de acordo com o método de Kaplan and Meier. A análise multivariada foi realizada empregando-se o modelo de risco proporcional de Cox. RESULTADOS: Oitenta e seis pacientes foram tratados com cirurgia curativa e o restante com ressecção paliativa. Invasão microscópica de órgãos e/ou estruturas adjacentes e linfonodos regionais foi encontrada em 48 e 31 pacientes respectivamente. O tempo de seguimento mediano, sem mortalidade pós operatória, foi de 47.7 meses. A taxa de sobrevida global em 5 anos foi de 52.6%. A taxa de sobrevida global para pacientes submetidos à cirurgia curativa e paliativa foi de 58.3% e zero, respectivamente. A sobrevida mediana no grupo de pacientes com cirurgia paliativa foi de 3.1 meses. A análise multivariada mostrou que a performance status de Karnofsky fortemente correlacionou com risco de complicações pós operatórias (p=0.01), e que o risco de morte pós operatória estava associada com o tipo de cirurgia e a performance status de Karnofsky na admissão (p=0.001) CONCLUSÕES: Pacientes com adenocarcinoma de cólon localmente avançados submetidos à ressecção extendida têm taxa de sobrevida global em 5 anos de 58.3% Este tipo de cirurgia pode ser empregada com intuito paliativo, mas deve ter indicação criteriosa e ser evitada em pacientes com baixa performance status de Karnofsky devido às altas taxas de mortalidade pós operatória e baixa sobrevida

Biomecánica del pilar canino en el cráneo humano basada en la geometría utilizando análisis de elementos finitos

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)This study evaluated the stress distribution based on the canine pillar geometry in human skull, using a finite element analysis. Computed tomography of human skull was used to build a finite element model, which was composed by all bony structures of canine pillar: canine eminence, canine fossa, frontal process of maxilla, glabellum and superciliary arch. A support on the bite contact of maxillary canine tooth and a resultant force of the masticatory muscles was applied in the simulation. Equivalent Von-mises and maximum principal stresses were analyzed along the structures that compose the canine pillar geometry. Von-mises stress presented high stress concentrated at the canine fossa and frontal process of maxilla. Maximum principal stress showed compression areas at the canine fossa and part of frontal process and tensile stress at canine eminence and part of the frontal process. In conclusion, the different stress areas means different force concentrations transmitted along the canine pillar geometry during a peak canine bite.This study evaluated the stress distribution based on the canine pillar geometry in human skull, using a finite element analysis. Computed tomography of human skull was used to build a finite element model, which was composed by all bony structures of can321214220CAPES - COORDENAÇÃO DE APERFEIÇOAMENTO DE PESSOAL E NÍVEL SUPERIORCoordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)sem informaçãoEste estudio evaluó la distribución de la tensión sobre la geometría del pilar canino en el cráneo humano, utilizando análisis de elementos finitos. Se usó la tomografía computarizada de cráneo humano para construir un modelo de elementos finitos compuestBrazil for financial support and the Center for Information Technology “Renato Archer” (Campinas, Brazil) for technical and scientific suppor

Efeito da utilização de acaricidas em citros, sobre a população de Brevipalpus phoenicis (Geijskes, 1939) e ácaros predadores (Phytoseiidae)

The experiment was carried out in order to study the effects of some acaricides on Brevipalpus phoenicis (Geijskes,1939) (Acari,Tenuipalpidae) and predatory mites (Phytoseiidae) hi citrus. The products tested and dosages in g AI/ 100 / of water were: fenpyroximate (5.0), acrinathrin (0.5), hexythiazox (1.5), amitraz (40.0) and sulphur (225.0). The acaricides fenpyroximate, acrinathrin and hexythiazox were efficient against B. phoenicis up to 127 days from the application date, whereas sulphur and amitraz presented good control up to 92 days and 58 days after treatment, respectively. Hexythiazox was fairly innocuous to predatory mites but, the remaining acaricides caused significant mortality to these mites. The pesticides sulphur, fenpyroximate and acrinathrin induced reductions of the population of phytoseid mites up to 58 days, but amitraz showed reductions up to 92 days after application.Foi conduzido experimento com o objetivo de estudar o efeito de alguns acaricidas sobre Brevipalpus phoenicis (Geijskes,1939) (AcarirTenuipalpidae) e ácaros predadores (Phytoseiidae), em citros. Os produtos testados e as dosagens em g i.a./100 / de água foram: fenpyroximate (5,0), acrinathrin (0,5); hexythiazox (1,5); amitraz (40,0) e enxofre (225,0). Os acaricidas fenpyroximate, acrinathrin e hexythiazox foram eficientes contra B. phoenicis até 127 dias após a aplicação, enquanto que, o enxofre e o amitraz apresentaram bom controle até 92 e 58 dias após o tratamento, respectivamente. O hexythiazox foi praticamente inócuo aos ácaros predadores mas os demais acaricidas foram significativamente prejudiciais a estes ácaros. Os produtos enxofre, fenpyroximate e acrinathrin induziram reduções na população de fitoseíídeos até 58 dias, porém o amitraz apresentou reduções até 92 dias após a pulverização

Efeito da utilização de acaricidas em citros, sobre a população de Brevipalpus phoenicis (Geijskes, 1939) e ácaros predadores (Phytoseiidae)

The experiment was carried out in order to study the effects of some acaricides on Brevipalpus phoenicis (Geijskes,1939) (Acari,Tenuipalpidae) and predatory mites (Phytoseiidae) hi citrus. The products tested and dosages in g AI/ 100 / of water were: fenpyroximate (5.0), acrinathrin (0.5), hexythiazox (1.5), amitraz (40.0) and sulphur (225.0). The acaricides fenpyroximate, acrinathrin and hexythiazox were efficient against B. phoenicis up to 127 days from the application date, whereas sulphur and amitraz presented good control up to 92 days and 58 days after treatment, respectively. Hexythiazox was fairly innocuous to predatory mites but, the remaining acaricides caused significant mortality to these mites. The pesticides sulphur, fenpyroximate and acrinathrin induced reductions of the population of phytoseid mites up to 58 days, but amitraz showed reductions up to 92 days after application.Foi conduzido experimento com o objetivo de estudar o efeito de alguns acaricidas sobre Brevipalpus phoenicis (Geijskes,1939) (AcarirTenuipalpidae) e ácaros predadores (Phytoseiidae), em citros. Os produtos testados e as dosagens em g i.a./100 / de água foram: fenpyroximate (5,0), acrinathrin (0,5); hexythiazox (1,5); amitraz (40,0) e enxofre (225,0). Os acaricidas fenpyroximate, acrinathrin e hexythiazox foram eficientes contra B. phoenicis até 127 dias após a aplicação, enquanto que, o enxofre e o amitraz apresentaram bom controle até 92 e 58 dias após o tratamento, respectivamente. O hexythiazox foi praticamente inócuo aos ácaros predadores mas os demais acaricidas foram significativamente prejudiciais a estes ácaros. Os produtos enxofre, fenpyroximate e acrinathrin induziram reduções na população de fitoseíídeos até 58 dias, porém o amitraz apresentou reduções até 92 dias após a pulverização

Three-dimensional stability of Burgers vortices

Burgers vortices are explicit stationary solutions of the Navier-Stokes equations which are often used to describe the vortex tubes observed in numerical simulations of three-dimensional turbulence. In this model, the velocity field is a two-dimensional perturbation of a linear straining flow with axial symmetry. The only free parameter is the Reynolds number $Re = \Gamma/\nu$, where $\Gamma$ is the total circulation of the vortex and $\nu$ is the kinematic viscosity. The purpose of this paper is to show that Burgers vortex is asymptotically stable with respect to general three-dimensional perturbations, for all values of the Reynolds number. This definitive result subsumes earlier studies by various authors, which were either restricted to small Reynolds numbers or to two-dimensional perturbations. Our proof relies on the crucial observation that the linearized operator at Burgers vortex has a simple and very specific dependence upon the axial variable. This allows to reduce the full linearized equations to a vectorial two-dimensional problem, which can be treated using an extension of the techniques developped in earlier works. Although Burgers vortices are found to be stable for all Reynolds numbers, the proof indicates that perturbations may undergo an important transient amplification if $Re$ is large, a phenomenon that was indeed observed in numerical simulations.Comment: 31 pages, no figur

EFEITO DO USO DE INOCULANTES SOBRE O pH E A COMPOSIÇÃO BROMATOLÓGICA DA SILAGEM DE SORGO (Sorghum bicolor L. Moench)

The objective of this work was to study the effect of three doses of commercial bacterial inoculant Sil-All (Alltech®), on the pH and the quality of the silage of sorgo, variety AG 2005. Sixteen experimental silos had been used, with capacity for 20kg of silage. The tested treatments had been T1 without the inoculante addition, T2: 2,5g/L of inoculante, T3: 5,0 g/L of inoculante and T4: 7,5 g/L of inoculante. After 60 days, the silos had been opened and samples removed for determination of pH, PB, FDN and FDA. The delineation was completely randomized, with four treatments and four repetitions. The different applied doses had resulted in significant difference (P 0,05) values of pH, PB, FDN and FDA.O objetivo do presente trabalho foi estudar o efeito de três doses do aditivo bacteriano comercial Sil-All (Alltech®), sobre o pH e a composição bromatológica da silagem de sorgo, variedade AG 2005. Foram utilizados 16 silos experimentais, com capacidade para 20kg de silagem. Os tratamentos testados foram T1: sem a adição de inoculante, T2: 2,5g/L de inoculante, T3: 5,0 g/L de inoculante e T4: 7,5 g/L de inoculante. Após 60 dias de ensilado, os silos foram abertos e retiradas amostras para determinação de pH, PB, FDN e FDA. O delineamento foi inteiramente casualizado, com quatro tratamentos e quatro repetições. As diferentes doses aplicadas resultaram em diferença significativa (P 0,05) os teores de pH, PB, FDN e FDA

Trigeminal Neuralgia: Literature Review

The trigeminal nerve, fifth equal of cranial nerves, a mixed nerve is considered by possessing motor and sensitive components. The sensitive portion takes to the Nervous System Central somesthesics information from the skin and mucous membrane of great area of the face, being responsible also for a neural disease, known as the Trigeminal Neuralgia. The aim of this study was to review the literature on the main characteristics of Trigeminal Neuralgia, the relevant aspects for the diagnosis and treatment options for this pathology. This neuralgia is characterized by hard pains and sudden, similar to electric discharges, with duration between a few seconds to two minutes, in the trigeminal nerve sensorial distribution. The pain is unchained by light touches in specific points in the skin of the face or for movements of the facial muscles, it can be caused by traumatic sequels or physiologic processes degenerative associate the vascular compression. 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A retrospective survey of a sample of patients in Singapore and Malaysia (1998) Australian Dental Journal, 43 (3), pp. 188-191. , PMid:9707784Luna, E.B., Graça, L.F.A., Silva, D.C.O., Bérzin, F., Silva, Z., Souza, G.C., Mitri, F.F., Aspectos Anatômicos e Patológicos da Neuralgia do Trigêmeo: Uma revisão da literatura para estudantes e profissionais da saúde (2010) Bioscience Journal, 26 (4), pp. 661-674Maestri, J.M., Holzer, F., Fisiopatología de la neuralgia del trigémeno (1993) Revista Chilena De Neuro-Psiquiatria, 31 (3), pp. 317-321Mattos, J.M.B., Bueno, F.V., Mattos, L.R., Neuralgia do Trigêmeo: Um novo protocolo de tratamento clínico (2005) Revista Dor, 6 (4), pp. 652-656Meneses, M.S., Clemente, R., Russ, H.H., Traitement microchirurgical de la névralgie du trijumeau (1995) Neurochirurgie, 41 (5), pp. 349-352. , PMid:8577355Monzillo, P.H., Sanvito, W.L., Costa, A.R., Cluster-Tic, S., Syndrome: Report of five new cases (2000) Arquivos De Neuro-Psiquiatria, 58, pp. 518-521. , http://dx.doi.org/10.1590/S0004-282X2000000300019, PMid:10920416Neville, B.W., Damm, D.D., Allen, C.M., Bouquot, J.E., (2004) Patologia Oral E Maxilofacial.2.ed, pp. 865-867. , Rio de Janeiro: Guanabara KooganNurmikko, T.J., Eldridge, P.R., (2001) Trigeminal Neuralgia: Pathophysiology, Diagnosis and Current Treatment. BJA: British Journal of Anaesthesia, 87, pp. 117-132. , http://dx.doi.org/10.1093/bja/87.1.117Patterson, C.W., Trigeminal neuralgia-a dental diagnosis challenge (1999) Northwest Dentistry, 78 (3), pp. 19-24Peters, G., Nurmikko, T.J., Peripheral and gasserian ganglion-level precedures for the treatment of trigeminal neuralgia (2002) Clinical Journal of Pain, 18 (1), pp. 28-34. , http://dx.doi.org/10.1097/00002508-200201000-00005, PMid:11803300Quesada, G.A.T., Baptista, C.E., Daiana, S.P., Douglas, L.F., Neuralgia Trigeminal-do diagnóstico ao tratamento (2005) Revista Dentística, (11)Siqueira, S.R.D.T., Nóbrega, J.C.M., Valle, L.B.S., Teixeira, M.J., Siqueira, J.T.T., Clinical aspects and dental procedures (2004) Oral Surgery, Oral Medicine, Oral Pathology, Oral Radiology, 98 (3), pp. 311-315Toda, K., Trigeminal neuralgia: Symptoms, diagnosis, classification, and related disorders (2007) Oral Science International, 4 (1), pp. 1-9. , http://dx.doi.org/10.1016/S1348-8643(07)80006-1Tronnier, V.M., Rasche, D., Hamer, J., Treatment of idiopathic trigeminal neuralgia: Comparison of long-term outcome after radiofrequency rhizotomy and microvascular decompression (2001) Neurosurgery, 48, pp. 1261-1268. , PMid:11383728Türp, J.C., Gobetti, J.P., Trigeminal neuralgia versus atypical facial pain: A review of the literature and case report (1996) Oral Surgery, Oral Medicine, Oral Pathology, Oral Radiology, 81 (4), pp. 424-432Yoon, K.B., Wiles, J.R., Miles, J.B., Nurmikko, T.J., Long-term outcome of percutaneous thermocoagulation for trigeminal neuralgia (1999) Anaesthesia, 54 (80), pp. 798-808Yoshimasu, F., Kurland, L.T., Elvelvack, L.R., Tic dolourex in Rochester, Minnesota (1972) Neurology, 22, pp. 952-956. , http://dx.doi.org/10.1212/WNL.22.9.952, 1945-1969. 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