Emission spectra and intrinsic optical bistability in a two-level medium

Scattering of resonant radiation in a dense two-level medium is studied theoretically with account for local field effects and renormalization of the resonance frequency. Intrinsic optical bistability is viewed as switching between different spectral patterns of fluorescent light controlled by the incident field strength. Response spectra are calculated analytically for the entire hysteresis loop of atomic excitation. The equations to describe the non-linear interaction of an atomic ensemble with light are derived from the Bogolubov-Born-Green-Kirkwood-Yvon hierarchy for reduced single particle density matrices of atoms and quantized field modes and their correlation operators. The spectral power of scattered light with separated coherent and incoherent constituents is obtained straightforwardly within the hierarchy. The formula obtained for emission spectra can be used to distinguish between possible mechanisms suggested to produce intrinsic bistability.Comment: 18 pages, 5 figure

A comparison of robust polynomial fitting, global geopotential model and spectral analysis for regional–residual gravity field separation in the Doñana National Park (Spain)

Doñana National Park is a protected area of approximately 500 km2 located on the SW coast of Spain with singular and interesting ecological and geological features. A gravimetric survey is presented where L&R gravity metres were used in the gravimetric observations with GPS and high-precision levelling positioning. Bouguer gravity anomalies were computed and least squares prediction was used for gross-error detection. Robust polynomial fitting, the recent EGM2008 global geopotential model (complete to degree and order 2159), and spectral analysis were tested for regional–residual gravity field separation. A detailed description of the gravimetric characteristics of the Doñana National Park is presented and the values of residual gravity anomalies were correlated with geological features, where the use of the EGM2008 global geopotential model has revealed an interesting tool for regional–residual gravity field separation. Finally, the interpretation of the results is justified by the well-known geological aspects of the park, but some modifications in the boundaries of the different geological features are needed in order to fit the modelled gravity with the residual gravity anomalies in the two cross-sections analysed.The studies presented here were part of CICYT (Spanish Research Directorate) research project nos. HID 97-0321 and REN2001-1293. We would like to thank all UPC members participating in these projects and the staff from the Biological Station of Donana (CSIC), Palacio de Donana and Donana National Park. We remain deeply grateful for the fruitful discussion with Dr. Salvany and for the geological review of the manuscript.Martín Furones, ÁE.; Nuñez Andrés, M.; Gili, J.; Anquela Julián, AB. (2011). A comparison of robust polynomial fitting, global geopotential model and spectral analysis for regional–residual gravity field separation in the Doñana National Park (Spain). Journal of Applied Geophysics. 75(2):327-337. https://doi.org/10.1016/j.jappgeo.2011.06.037S32733775

Editorial: From judge to jury: the potential for crowd reviewing

In this editorial, we introduce the four best papers selected from the IPSERA 2021 conference for this special issue of the Journal. We discuss how a double-blind crowd review (CR) process was used as an alternative to the traditional "two reviewer " double-blind peer review system. After a brief review of the literature and the existing debate around academic peer review, we introduce the main characteristics of CR. Next, at the core of our discussion, we report on the results of a pilot CR project that we conducted to review JPSM articles associated with the 2021 IPSERA Conference. We describe in detail the review process, and we illustrate the feedback received from reviewers and authors on the CR process, as well as our perspective as guest editors. Finally, we draw some conclusions and present recommendations for CR in the Purchasing and Supply Management (PSM) field. The CR pilot contributes to the wider debate around peer-reviewing by offering insights into the experience of different stakeholders and by highlighting the benefits and pitfalls of CR

Temporal lobe resection and postpartum psychosis

Background: Postpartum period may aggravate the symptoms of psychosis and this effect may be attributed to the triggering effect of the sudden drop of plasma pregnancy hormone levels immediately after delivery. Mesial temporal lobe resection may be another factor for the exacerbation of schizophrenia like psychosis. Case Report: We presented a 32-year old Caucasian female patient who had temporal lobectomy, before her pregnancy and developed a psychotic disorder during the post partum period. Conclusions: In this case report, the possible relationship among temporal lobe resection, postnatal period, and psychotic disorder is discussed

Takayasu's arteritis in Turkey - Clinical and angiographic features of 248 patients

Objective. Takayasu's arteritis (TA) is a chronic, inflammatory vasculitis affecting the aorta and its major branches. Although it is more prevalent in Far-East Asia, the distribution of the disease is worldwide with different vascular involvement patterns and clinical manifestations. The objective of this study was to evaluate the demographic, clinical, angiographic and prognostic features of TA patients in Turkey. Methods. Clinical and angiographic findings of 248 TA patients (228 female, 27 male) followed at 15 Rheumatology Centers were prospectively evaluated according to a predefined protocol. Results. The mean age was 40.1 years (30.2 years at the clinical onset). Clinical manifestations included constitutional symptoms in 66%, absent or diminished pulses in 88%, bruits in 77%, extremity pain in 69%, claudication in 48%, hypertension in 43% and cerebrovascular accidents (CVA) in 18% of the patients. Renal artery stenosis, aortic regurgitation and pulmonary hypertension were present in 26%, 33% and 12%, respectively. According to the new angiographic classification, type V (50.8%) and Type I (32%) were the most frequent types of involvement. Corticosteroids were the main treatment in 93% of the patients alone (9%) or in combination with immunosuppressive agents (84%). Most frequently preferred immunosuppressive agents were methotrexate (63%), azathioprine (22%) and cyclophosphamide (13%). Remission was observed at least once in 94% of the patients and sustained remission in 71% during follow-up. Conclusion. The demographical, clinical and angiographic findings of TA patients in our series were similar to those reported from Japan, Brazil and Colombia. Combination therapies with immunosuppressive agents were the preferred choice of treatment in Turkey. © Copyright Clinical and Experimental Rheumatology 2009