17,968 research outputs found
The dynamics of unemployment and employment. Belgium, 1947-1973. Studies: Social Policy Series 24, 1976
Noncommutative symmetric functions and W-polynomials
Let K,S,D be a division ring, an endomorphism and a S-derivation of K,
respectively. In this setting we introduce generalized noncommutative symmetric
functions and obtain Vieta formula and decompositions of differential
operators. W-polynomials show up naturally, their connections with
P-independency, Vandermonde and Wronskian matrices are briefly studied. The
different linear factorizations of W-polynomials are analysed. Connections
between the existence of LLCM of monic linear polynomials with coefficients in
a ring and the left duo property are established at the end of the paper
Wage-setting Behavior in France: Additional Evidence from an Ad-hoc Survey
We investigate the wage-setting behavior of French companies using an ad-hoc survey conducted specifically for this study. Our main results are the following. i) Wages are changed infrequently. The mean duration of wage contracts is one year. Wage changes occur at regular intervals during the year and are concentrated in January and July. ii) We find a lower degree of downward real wage rigidity and nominal wage rigidity in France compared to the European average. iii) About one third of companies have an internal policy to grant wage increases according to inflation. iv) When companies are faced with adverse shocks, only a partial response is transmitted into prices. Companies also adopt cost-cutting strategies. The wage of newly hired employees plays an important role in this adjustment.Wage Rigidity, Wage-setting Behavior, Survey Data.
Continuous monitor for gas ratios in a mixture
Fluidic oscillator, incorporating piezoelectric transducer to sense molecular weight of gas mixture, is used to continuously monitor ratio of a mixture of two gases in a flowing system. Device is lightweight, compact, reliable, easy to install, and also produces a simple output signal for controller. Frequency of oscillation is measured and signal converted to ac output
The digital code driven autonomous synthesis of ibuprofen automated in a 3D-printer-based robot
An automated synthesis robot was constructed by modifying an open source 3D printing platform. The resulting automated system was used to 3D print reaction vessels (reactionware) of differing internal volumes using polypropylene feedstock via a fused deposition modeling 3D printing approach and subsequently make use of these fabricated vessels to synthesize the nonsteroidal anti-inflammatory drug ibuprofen via a consecutive one-pot three-step approach. The synthesis of ibuprofen could be achieved on different scales simply by adjusting the parameters in the robot control software. The software for controlling the synthesis robot was written in the python programming language and hard-coded for the synthesis of ibuprofen by the method described, opening possibilities for the sharing of validated synthetic ‘programs’ which can run on similar low cost, user-constructed robotic platforms towards an ‘open-source’ regime in the area of chemical synthesis
Structural Health Monitoring and Condition Assessment of Chulitna River Bridge
INE/AUTC 12.29 (Training Report) and INE/AUTC 12.30 (Sensor Selection and Field Installation Report
Rotational and rotationless states of weakly-bound molecules
By making use of the quantization rule of Raab and Friedrich [P. Raab and H.
Friedrich, Phys. Rev. A 78, 022707 (2008)], we derive simple and accurate
formulae for the number of rotational states supported by a weakly-bound
vibrational level of a diatomic molecule and the rotational constants of any
such levels up to the threshold, and provide a criterion for determining
whether a given weakly-bound vibrational level is rotationless. The results
depend solely on the long-range part of the molecular potential and are
applicable to halo molecules.Comment: slightly corrected version, 4 pages, 1 figure, 3 table
A Twisting Electrovac Solution of Type II with the Cosmological Constant
An exact solution of the current-free Einstein-Maxwell equations with the
cosmological constant is presented. It is of Petrov type II, and its double
principal null vector is geodesic, shear-free, expanding, and twisting. The
solution contains five constants. Its electromagnetic field is non-null and
aligned. The solution admits only one Killing vector and includes, as special
cases, several known solutions.Comment: 4 pages, LaTeX 2e, no figures. The present (second) version,
identical to that published in General Relativity and Gravitation, is derived
from the first version by presenting the admitted Killing vector, and by
adding the last paragraph, two footnotes (here Footnotes 1 and 3), and two
references (here Refs. [3,4]
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