A absorção do cobre pela cana de açúcar Co 419 em função da idade

O presente trabalho teve por objetivo a determinação da concentração de cobre e o estudo das quantidades absorvidas do elemento citado, pela cana de açúcar Co 419, crescendo em condições de campo na região de Piracicaba, Estado de São Paulo. As amostras eram provenientes de 3 repetições, de um tratamento no qual as nlantas sofreram adu-bação com nitrogênio, fósforo e potássio, variando as plantas de 6 a 15 meses de idade. O método utilizado na determinação do cobre, foi o do dietilditiocarbamato de sódio. A concentração de cobre apresentou um relativo decréscimo, com o aumento de idade da planta, variando os teores de cobre no colmo de 7,4 a 62,8 ppm e na folha de 10,0 a 30,0 ppm. Quanto a absorção do cobre, a planta apresentou um aumento proporcional a idade. A mesma absorveu maior quantidade no 14.° mês, 412,2 miligramas de cobre, por 4 touceiras.

Absorção de molibdênio pela cana de açúcar variedade Co 419, em função da idade

In this paper the authors describe the results obtained from the determination of molybdenum in sugar cane plant, grown in soils and climate prevailing in Piracicaba, State of São Paulo, Brazil. The molybdenum was determined in samples cut monthly from the 8th to 14th month, from an experiment consisting of 6 plots, 3 fertilized and 3 unfertilized. The fertilized treatment received 40 kg N (ammonium sulfate) 100 kg P2O3, (superphosphate) and 40 kg K2O (potassium chloride) per hectare, just before planting. Molybdenum was determined by thiocyanate-stannous chloride method, using carbon tetrachloride-butyl alcohol misture, for extrating the colored complex. The results obtained show a parallelism in the absorption of molybdenum by the plants of both treatments. The concentration of molybdenum in the stalks have a tendency to decrease, where as it kept more or less constant in leaves, with a exception in the 14° month when it rised probable because of a migration of molybdenum of the stalks to the leaves. The total amount molybdenum taken up was higher with the fertilized plot due its greater mass prodution.

A Model of Video Traffic Transmission in IP Networks

Telecommunications and network technology is now the driving force that ensures continued progress of world civilization. Design of new and expansion of existing network infrastructures requires improving the quality of service(QoS). Modeling probabilistic and time characteristics of telecommunication systems is an integral part of modern algorithms of administration of quality of service. At present, for the assessment of quality parameters except simulation models analytical models in the form of systems and queuing networks are widely used. Because of the limited mathematical tools of models of these classes the corresponding parameter estimation of parameters of quality of service are inadequate by definition. Especially concerning the models of telecommunication systems with packet transmission of multimedia real-time traffic.

Assessment of the VoIP Transmission Quality over Digital Power Line Carrier Channels

This article is devoted to the research of VoIP transmission quality over Digital Power Line Carrier channels. Assessment of quality transmission is performed using E-model. Paper considers the possibility of joint using of Digital Power Line carrier equipment with different architecture in one network. As a result of the research, the rule for constructing of multi-segment Digital Power Line Carrier channels was formulated. This rule allows minimizing the transmission delay and saving frequency resources of high voltage Power Line Carrier range.

The Research of Increase of Channel Efficiency for IP Traffic Transmission over Digital Power Line Carrier Channels

This article is devoted to the research of channel efficiency for IP-traffic transmission over Digital Power Line Carrier channels. The application of serial WAN connections and header compression as methods to increase channel efficiency is considered. According to the results of the research an effective solution for network traffic transmission in DPLC networks was proposed.

Electrochemical oxidation of H 2, CO gas mixtures in polymer-electrolyte-membrane fuel cells

Magdeburg, Univ., Fak. für Verfahrens- und Systemtechnik, Diss., 2014

Process design based on CO 2-expanded liquids as solvents

Magdeburg, Univ., Fak. für Verfahrens- und Systemtechnik, Diss., 2014

Efficiency of parallel transmission methods at 7T magnetic resonance

Magdeburg, Univ., Fak. für Naturwiss., Diss., 2014

Einzelzelltransfektion in organotypischen Schnittkulturen und die Bedeutung von BDNF bei Prozessen der synaptischen Transmission und Plastizität

Magdeburg, Univ., Fak. für Naturwiss., Diss., 2014

Efficient query processing in co-processor-accelerated databases

...Diese Dissertation zeigt, wie wir Datenbankmanagementsysteme bauen können, die heterogene Prozessoren effizient und zuverlässig zur Beschleunigung der Anfrageverarbeitung nutzen können. Daher untersuchen wir typische Entwurfsentscheidungen von coprozessorbeschleunigten Datenbankmanagementsystemen und leiten darauf aufbauend eine generische Architektur für solche Systeme ab. Unsere Untersuchungen zeigen, dass eines der wichtigsten Probleme für solche Datenbankmanagementsysteme die Entscheidung ist, welche Operatoren einer Anfrage auf welchem Prozessor ausgeführt werden sollen...

The co-evolution of social behavior and cranial morphology in sheep and goats (Bovidae, caprini) [by] William M. Schaffer and Charles A. Reed.

v.61(1971)

Boletin de la Academia Nacional de Ciencias en Córdoba, República Argentina.

t.1 (1874)

Boletin de la Academia Nacional de Ciencias en Córdoba, República Argentina.

t.8 (1885)

Boletin de la Academia Nacional de Ciencias en Córdoba, República Argentina.

t.11 (1887)

Boletin de la Academia Nacional de Ciencias en Córdoba, República Argentina.

t.7 (1884)