Capital et travail

La recension de l’ouvrageCapital et travail de Victor Levant préparée par Jean Boivin et publiée dans R.I. vol 33, no 2 a donné lieu à une réaction. Respectant le désir de l'auteur, nous publions dans son intégrité la lettre qu'il nous a adressée. Nous publions de plus les remarques des professeurs Laperrière et Noumoff ainsi que la réplique de Jean Boivin

Preparation and characterization of Bi26–2xMn2xMo10O69-d and Bi26.4Mn0.6Mo10–2yMe2yO69-d(Me = V, Fe) solid solutions

Received: 06.06.2017; accepted: 23.06.2017; published: 14.07.2017.Single phase samples of bismuth molybdate, Bi26Mo10O69, doped with Mn on the bismuth sublattice and V, Fe on the molybdenum sublattice were found to crystallize in the triclinic Bi26Mo10O69 structure at low doping levels and in the monoclinic Bi26Mo10O69 structure - at higher dopant concentration. The assumption that all Mn ions have an oxidation state of +2 was confirmed by means of magnetic measurement results analysis using Curie-Weiss law. Conductivity was investigated using impedance spectroscopy. The conductivity of Bi26.4Mn0.6Mo9.6Fe0.4O69-d was 1.2*10-2 S*cm-1 at 973 K and 2.2*10-4 S*cm-1 at 623 K, and the conductivity of Bi26.4Mn0.6Mo9.2V0.8O69-d was 2.2*10-3 S*cm-1 at 973 K and 2.2*10-5 S*cm-1 at 623 K

Diverging Trends in Macro and Micro Volatility: Facts

In this paper, we document the diverging trends in volatility of the growth rate of sales at the aggregate and firm level. We establish that the upward trend in micro volatility is not simply driven by a compositional bias in the sample studied. We argue that this new fact renders obsolete the proposed explanations for the decline in aggregate volatility and that, given the symmetry of the diverging trends at the micro and macro level, a common explanation is highly likely. We conclude by describing one such theory driven by market integration

Generalist predator Stratiolaelaps scimitus hampers establishment of the bulb scale mite predator Neoseiulus barkeri in Hippeastrum

In this study we investigate the hypothesis that presence of the generalistsoil-dwelling predatory mite Stratiolaelaps scimitus (Womersley)results in lower densities of the phytoseiid soil-dwelling predatorNeoseiulus barkeri Hughes in Hippeastrum (amaryllis). If true, thismay increase risks of bulb scale mite Steneotarsonemus laticeps (Halbert)infestations in Hippeastrum, because N. barkeri predates on this pest,whereas S. scimitus does not. In a greenhouse trial we show indeed thatthe release of S. scimitus results in significantly lower densities of N.barkeri in a Hippeastrum crop. Moreover, analyses of soil and bulbsamples from a commercial Hippeastrum farm suggest that this predatorinterference is facilitated by soil cooling techniques that drive thepredators together to small ‘islands’ of higher surface temperature

Panel discussion

"The Importance of Being Predictable" by John B. Taylor -- "Monetary Policy Under Uncertainty" by Ben S. Bernanke -- "The Importance of Being Predictable" by William PooleMonetary policy

The monetary transmission mechanism: some answers and further questions

Overview of the proceedings of a conference sponsored by the Federal Reserve Bank of New York entitled Financial Innovation and Monetary TransmissionMonetary policy ; Financial modernization ; Bank reserves ; Interest rates

Psychometrics properties of the Iranian version of fertility quality of life tool: a cross- sectional study

Background: Clinical measurement of quality of life for assessing reproductive problems should be considered as a standard investigation at the initial and continuing medical consultations with infertile people. Objective: The purpose of this study was comprehensive testing the psychometric properties of the Iranian version of fertility quality of life (FertiQol) as its use could be considerable due to the prevalence of infertility in Iran and the importance of evaluation of QoL in patients with infertility. Method and material: This was a psychometric properties study of 300 women referred to infertility clinic, Hormozgan, Iran. After linguistic validation of the Iranian version of MPCOSQ, a semi-structured interview was conducted to assess face validity. Consequently exploratory factor analysis (EFA) and confirmatory factor analysis (CFA) were performed to indicate the scale constructs. Discriminant validity was assessed using the known groups comparison. Convergent validity was evaluated by assessing the correlation between similar content on the 12-Item Short Form Health Survey, Hospital Anxiety and Depression Scale and FertiQol. In addition, reliability analysis was carried out with internal consistency. Results: The reliability of the Iranian version of the FertiQol questionnaire was satisfactory in all dimensions (Cronbach’s alpha ranging from 0.77 to 0.83 ). Six factors (emotional, mind/body, relational, social, environmental and tolerability) were extracted from the results of EFA with factor loading of the more than 0.3. Discrimination validity showed that FertiQol can differentiate between female patients with differing duration of infertility and number of children; this indicates favorable discrimination validity. Moreover, the results of convergent validity showed a favorable correlation between the related dimensions of 12-Item Short Form Health Survey (correlation ranging from 0.43 to 0.68 ), Hospital Anxiety and Depression Scale(correlation ranging from 0.47 to 0.52 ) and FertiQol. Conclusion: The Iranian version of FertiQol is valid and reliable for assessing infertility problems and the effects of treatment on quality of life of infertile patients referred for diagnosis and treatment at an Iranian infertility clinic. The clinical use of this measure is recommended for Iranian infertility clinics