Results 51 to 60 of about 7,925,437 (177)

The ambiguity of freemartinism diagnosis in cattle revealed by cytogenetic and molecular techniques

open access: yesCzech Journal of Animal Science, 2004
Nineteen heifers and three male co-twins, originating from heterosexual twin pregnancies, were analysed with the use of cytogenetic and molecular techniques.
J. Nowacka   +6 more
doaj   +1 more source

Weak shape theorem in first passage percolation with infinite passage times

open access: yes, 2014
We consider the model of i.i.d. first passage percolation on $\mathbb{Z}^d$ : we associate with each edge $e$ of the graph a passage time $t(e)$ taking values in $[0,+\infty]$, such that $\mathbb{P}[t(e)p_c(d)$.
Cerf, Raphaël, Théret, Marie
core  

Progress in existing and planned MST radars [PDF]

open access: yes, 1986
Radar systems are described which use two different wind measuring techniques: the partial-reflection drift technique and the mesosphere-stratosphere-troposphere (MST) or Doppler beam-swing radar technique.
Vanzandt, T. E.
core   +1 more source

Microwave dichroic plate [PDF]

open access: yes, 1979
A dichroic plate for microwave energy includes an array of interlaced crossed slots or dipole elements. Each of the elements includes first and second crossed arms that are at approximately right angles to each other and aligned with X and Y axes.
Wise, T. E.
core   +1 more source

Fuel optimal maneuvers of spacecraft about a circular orbit [PDF]

open access: yes, 1982
Fuel optimal maneuvers of spacecraft relative to a body in circular orbit are investigated using a point mass model in which the magnitude of the thrust vector is bounded.
Carter, T. E.
core   +1 more source

A Service-Learning proposal for Architecture, Building and Urbanism Students: getting involved in Education Tours in Madrid

open access: yesAdvances in Building Education
A Service-Learning methodology has been employed by professors and students at the Universidad Politécnica de Madrid to design and conduct two educational tours: "Spanish Enlightenment and the discovery of three chemical elements" and "The ‘altos del ...
Gabriel Pinto   +7 more
doaj   +1 more source

On the Riemann zeta-function and the divisor problem

open access: yes, 2004
Let $\Delta(x)$ denote the error term in the Dirichlet divisor problem, and $E(T)$ the error term in the asymptotic formula for the mean square of $|\zeta(1/2 + it)|$.
Ivić, Aleksandar
core   +7 more sources

Optimizing the performance of thermionic devices using energy filtering

open access: yes, 2004
Conventional thermionic power generators and refrigerators utilize a barrier in the direction of transport to selectively transmit high-energy electrons.
H Linke   +4 more
core   +1 more source

Evaluación del estado de la madera en obras de rehabilitación mediante técnicas de ultrasonidos y obtención de parámetros resistentes

open access: yesInformes de la Construccion, 1995
Este artículo presenta el desarrollo de un método de ensayo, no destructivo, para la inspección y evaluación in situ de elementos estructurales de madera, basado en las medidas de la velocidad de ondas ultrasónicas y determinación de humedad. Mediante la
Carmen Rodríguez Liñán   +1 more
doaj   +1 more source

Characterization of material composite marble-polyester

open access: yesMateriales de Construccion, 2002
In this work we characterize a new material composite, formed with a polyester and crushed white marble mixture. The final purpose is double: to obtain a material for applications sufficiently competitive after an economic viability study, increasing ...
F. A. Corpas Iglesias   +5 more
doaj   +1 more source

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