Complejos aniónicos de Au (III) conténiendo radicales orto-nitrofenilo

We disscribe the preparation of the complexes tetramethylamonium dibromo- and diiodo-bis(orthonitrophenyl)aurate(III) by reacting tetramethylamonium dichloro-bis(orthonitrophenyl)aurate (III) with, respectiwly KBr or KI.Se describe la preparación de los complejos dibromo- y diiodo-bis (orto-nitrofenil)aurato(III) de tetrametil amonio por reacción entre dicloro- bis{ortonitrofenil)aurato(III) de tetrametilamonio y las sales XK (X=Br, I)

Orfo-nitrofenil derivados de mercurio

The methods for obtaining bis(ortho-nitr<>phenyl)mercviry(II) are discussed.Se discuten las distintas vías de preparación de bis(orto-nitrofeml) mercurio(II)

Learning Network Assisted by Means of Symbolic Computation

Non

The Use of Electrical Measurements of Wind Turbine Generators for Drive Train Condition Monitoring

More modern and larger wind turbine (WT) generators are under continuous development. These exhibit more faults than smaller ones, which becomes critical offshore. Under this framework, operation and maintenance (O&M) is the key to improve reliability and availability of WTs, where condition-based maintenance (CBM) is currently seen as the preferred approach by the early detection and diagnosis of critical faults for WTs. The induction generator is one of the biggest contributors to failure rates and downtime of WTs, together with the gearbox and the drive train. In the present chapter, current signature analysis (CSA) will be introduced as a means for fault detection of WTs. CSA is a cost-effective and nonintrusive technique that can monitor both mechanical and electrical faults within the induction generator, as well as bearing- and gearbox-related faults. Different test cases of in-service wind turbine generators will be used to illustrate its usefulness

An analysis in vivo of intracanal bacterial load before and after chemo-mechanical preparation: a comparative analysis of two irrigants and two activation techniques

Background: The goals of this randomized double-blind trial were to assess the antimicrobial activity in vivo of Sodium hypochlorite (NaOCl) vs. chlorhexidine gluconate (CHX) used in combination either with EndoActivator® or IRRI S® files in patients with apical periodontitis. Material and Methods: A total of 120 patients with apical periodontitis (in single or multiple root canals) were randomly assigned to the four irrigation protocols outlined below: Group A: 5.25% sodium hypochlorite (NaOCl) + EndoActivator®; Group B: 5.25% NaOCl + IRRI S® files; Group C: 2% chlorhexidine gluconate (CHX) + EndoActivator®; Group D: 2% CHX + IRRI S® files. Paper points were used to collect microbiological samples before (1A samples) and after (1B samples) irrigation. Viable colony-forming units (CFU) were quantified twice: (1) without speciation, and (2) only for Enterococcus Faecalis ( EF ). Statistical analysis was performed using SPSS 22.0 for Windows. Results: No significant differences were observed between NaOCl and CHX in the reduction of CFU; in fact, reduction was > 93% for the two irrigants. Conversely, statistically significant differences were found between the two activation techniques (sonic and ultrasonic) in the reduction of Enterococcus faecalis ( EF ). Thus, the effectiveness of ultrasonic activation was significantly higher (> 93%; p=0.012) as compared to sonic activation. Following the combination of the two irrigants with the two activation techniques (groups A, B, C and D), significant differences were observed between group A and B ( p =0.025) in the reduction of EF populations, reaching up to 94%. Conclusions: NaClO and CHX are effective in reducing intracanal bacterial load. Ultrasonic activation is the most effective activation technique in reducing EF populations

Crecimiento y eficiencia de uso del nitrógeno en maíz de regadío en una región semiárida según la fertilización nitrogenada utilizada

The main groundwater pollution factor in irrigated maize production areas is leaching of nitrogen below the root zone. During the years 1999-2001, experiments were carried out on irrigated maize in the semiarid region of Castilla- La Mancha to evaluate the effect of nitrogen in the growth and yield of maize. Three rates of nitrogen were tested: No (0 kg N ha-1), Nop (175, 150 and 130 kg N ha-1 in 1999, 2000 and 2001, respectively), and Nc (300 kg N ha-1). A high initial level of residual soil NO-3 was found in the spring of 1999 as a consequence of fertilization carryover from the previous years. Although there was no plant response to N fertilization in 1999, significant responses were obtained during the following two years. Moreover, in 2000, the grain production did not show significant differences between Nop and Nc. However, in 2001, maize yield was slightly decreased due to an attempt to decrease the Nop to 130 kg N ha-1, showing significant differences with regard to Nc. The differences in grain yield among nitrogen levels were mainly due to a significant variation in maximum leaf area index, leaf area duration and crop growth rate. There was a decreasing pattern in nitrogen use efficiency values with increasing fertilizer rates, indicating that crop production could be sustained with lower fertilizer applications. Fertilizer practices must be revised in order to control and prevent insofar as possible water pollution in "La-Mancha Oriental" aquifer.El principal contaminante del agua subterránea en las áreas de regadío cultivadas de maíz es la lixiviación del nitrógeno. Durante los años 1999 a 2001 se han realizado ensayos en maíz regado en la región semiárida de Castilla-La Mancha, con el objetivo de evaluar su producción y crecimiento ante tres dosis de nitrógeno: No (0 kg N ha-1), Nop (175, 150 y 130 kg N ha-1 en 1999, 2000 y 2001, respectivamente), y Nc (300 kg N ha-1). El alto nivel inicial de NO-3 residual en el suelo durante la primavera de 1999, consecuencia de la fertilización anterior, propició la falta de respuesta a la fertilización con N. Sin embargo, se obtuvieron respuestas significativas los dos años siguientes. Además, en el año 2000, la producción de grano no registró diferencias significativas entre Nop y Nc. Sin embargo, disminuyó ligeramente la producción en el año 2001 al tratar de reducir la dosis óptima a 130 kg N ha-1, presentando diferencias significativas respecto a Nc. Este hecho fue debido, principalmente, a una variación significativa en el índice de área foliar máximo, la duración del área foliar y la tasa de crecimiento del cultivo. Las dosis más elevadas de fertilizante originaron una disminución de la eficiencia de uso del nitrógeno, por lo que la producción podría obtenerse con unos aportes menores de nitrógeno. Se debe revisar la fertilización para contribuir a controlar y prevenir, en la medida de lo posible, la contaminación en el acuífero de La Mancha Oriental

Long-Term Operational Data Analysis of an In-Service Wind Turbine DFIG

(c) 2019 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other users, including reprinting/ republishing this material for advertising or promotional purposes, creating new collective works for resale or redistribution to servers or lists, or reuse of any copyrighted components of this work in other works.[EN] While wind turbine (WT) power capacities continue to increase and new offshore developments are being deployed, operation and maintenance (O&M) costs continue to rise, becoming the center of attention in the wind energy sector. The electric generator is among the top three contributors to failure rates and downtime of WTs, where the doubly fed induction generator (DFIG) is the dominant technology among variable speed WTs. Thus, the early detection of generator faults, which can be achieved through predictive maintenance, is vital in order to reduce O&M costs. The goal of this paper is to analyze a long-term monitoring campaign of an in-service WT equipped with a DFIG. A novel method named the harmonic order tracking analysis is used with two main objectives: first, to facilitate the data interpretation for non-trained maintenance personnel, and second, to reduce the amount of data that must be stored and transferred for the diagnosis of the DFIG. This method is applied and validated for the first time on an operating WT.This work was supported in part by the Agreement signed between the UCLM and the Council of Albacete to promote research in the Campus of Albacete, and in part by the European Union Horizon 2020 Research and Innovation Programme through the Marie Sklodowska-Curie Grant (AWESOME Project) under Grant 642108. The authors would like to thank Ingeteam Power Technology S.A. UP Service, part of the AWESOME Project Consortium providing the wind turbine data.Artigao, E.; Sapena-Bano, A.; Honrubia-Escribano, A.; Martinez-Roman, J.; Puche-Panadero, R.; Gómez-Lázaro, E. (2019). Long-Term Operational Data Analysis of an In-Service Wind Turbine DFIG. IEEE Access. 7:17896-17906. https://doi.org/10.1109/ACCESS.2019.2895999S1789617906