1,527 research outputs found
Theognete lalannei Anderson 2010, new species
No full text<p> <b> 40. <i>Theognete lalannei</i> Anderson, new species</b> (Figures 150, 185, 220)</p> <p> <b>Diagnosis.</b> Size. Length, male, 3.29–3.98mm; female, 3.63–4.07mm. Width, male, 1.87–2.38mm; female, 2.13–2.47mm. As for <i>T. tzotzil</i> except pronotum subcordate, punctures distinct, deep, scales distinctly plumose and not as erect, especially in paramedian concentrations. Elytral strial regions with scales minute and hair-like. Mesosternum with deep, pilose, pit-like impression. Aedeagus as in Fig. 185.</p> <p> <b>Geographical distribution</b>. Honduras (Cortes, Ocotepeque) and El Salvador (Santa Ana, Chalatenango).</p> <p> <b>Natural history</b>. Collected from berlese extraction of cloud forest leaf litter at elevations from 2100– 2650m.</p> <p> <b>Derivation of specific name</b>. Through their support of the Nature Discovery Fund at the Canadian Museum of Nature, this species is named after Marc Louis Lalanne of Montreal, Quebec, Canada, as a gift from the Lalanne family.</p> <p> <b>Material examined</b>. 63♂, 40♀♀ (CMNC, CWOB, EAPZ, USNM, UVGC). Holotype ♂ (CMNC): HONDURAS: Ocotepeque. Guisayote, 20.5 km. E. Ocotepeque, 2170m, 16.VI.1994 -119, R. Anderson, cloud for. litt. / HOLOTYPE ♂, <i>Theognete lalannei</i> sp. nov., R.S. Anderson. Aedeagus extracted. Paratypes: EL SALVADOR. Chalatenango. San Ignacio (13.1 km.N.), El Pital, 2650m, 28.VIII.1994 -226, R. Anderson, cloud forest litter berlese (23♂, 8♀♀ CMNC, CWOB, EAPZ, USNM, UVGC). Santa Ana. Metapan (21.7 km. N.E.), Cerro Montecristo, 2100m, 29.VIII.1994 -228, R. Anderson, hardwood forest litter berlese (6♂, 4♀♀ CMNC). Metapan (21.7 km. N.E.), Cerro Montecristo, 2100m, 29.VIII.1994 -229, R. Anderson, cloud forest litter berlese (11♂, 13♀♀ CMNC). HONDURAS. Cortes. P.N. Cusuco, Cofradia (18.7km N.), Buenos Aires (5.4km W.), Cerro Jilinco, 1960m, 26.VIII.1994 -223A, R. Anderson, pine/cloud forest litter berlese (3♂ CMNC). Lempira. P.N. Celaque, nr. Gracias, Campamento Naranjo, 14°32.7' N 88°39.7' W, 2500m, 12–13.V.2002, R. Anderson, cloud forest litter, 2002–020 (1♂, 1♀ CMNC). P.N. Celaque, nr. Gracias, above camp. Don Tomas, 14°32.7' N 88°39.7' W, 2250m, 12–13.V.2002, R. Anderson, mixed oak forest litter, 2002- 021 (1♀ CMNC). Ocotepeque. Ocotepeque (20.5 km. E.), Guisayote, 2170m, 13.VI.1994 -114, R. Anderson, cloud forest litter (7♂, 4♀♀ CMNC). Ocotepeque (20.5 km. E.), Guisayote, 2170m, 14.VI.1994 -115, R. Anderson, cloud forest litter (3♂, 2♀♀ CMNC). Ocotepeque (20.5 km. E.), Guisayote, 2170m, 15.VI.1994 - 117, R. Anderson, cloud forest litter (1♂ CMNC). Ocotepeque (20.5 km. E.), Guisayote, 2170m, 16.VI.1994 - 119, R. Anderson, cloud forest litter (7♂, 7♀♀ CMNC).</p> <p> <b>Chorological relationships</b>. Sympatric with <i>T. pragudemi</i> and <i>T. jeanae</i>.</p>Published as part of <i>Anderson, Robert S., 2010, A taxonomic monograph of the Middle American leaf-litter inhabiting weevil genus Theognete Champion (Coleoptera: Curculionidae; Molytinae; Lymantini) 2458, pp. 1-127 in Zootaxa 2458 (1)</i> on page 47, DOI: 10.11646/zootaxa.2458.1.1, <a href="http://zenodo.org/record/5316658">http://zenodo.org/record/5316658</a>
Statistical analysis of pump-pulse propagation in gas-filled capillaries for high-harmonic generation
No full textDriving high-harmonic generation (HHG) with ultrashort pulses confined to gas-filled capillaries is an efficient method of generating extreme ultraviolet and x-ray radiation. In-situ pulse compression can significantly enhance HHG efficiency [1] but requires operation in the high-ionisation limit, leading to high sensitivity to initial conditions and causing the Gaussian driving pulse to break up into a train of subpulses as it propagates. Our previous studies [1,2] have focused on the most intense subpulse, which can be very short (<10 fs). Here, we perform statistical analysis of all pulse components predicted by numerical simulation, including the contribution of the weaker subpulses, with the aim of predicting generated HHG profiles
Experimental demonstration of a high-flux capillary based XUV source in the high ionisation regime
No full textHigh harmonic generation (HHG) has proven to be a fascinating and incredibly useful nonlinear optical phenomenon and has led to the realisation of tabletop sources of coherent extreme ultraviolet (XUV) radiation. Capillary based geometries in particular have attracted a great deal of attention due to their lengthy interaction regions and the potential to phase-match the HHG process leading to a large increase in XUV flux. Unfortunately due to plasma induced nonlinear and dispersive effects the simple phase-matching mechanism detailed in [1] cannot be scaled to high energy pump pulses and high gas pressures. In this work we have used a computational model [2] to design a capillary that can support a broad interaction region well-suited to quasi-phase-matching (QPM) while simultaneously reducing the effect that XUV reabsorption has on the output flux of the source. This modelling work has involved adjusting both the capillary length and gas density profile (figure 1a) in order to produce rapid oscillations in the radially integrated ionization fraction (figure 1b) coupled with a rapid decrease in gas pressure at the capillary exit. Our theory suggests that these oscillations are driven by a nonlinear self-compression process modulating the intensity of the pump pulse as it propagates through the plasma-filled waveguide [3]. Subsequent experimental work has shown an increase in XUV flux of almost 50 times over our previous capillary-based source (see figure 1c), and preliminary estimates suggest a photon flux of 1012 photons s-1 harmonic-1 in the 45 eV spectral region
Isolated attosecond pulses by self-compression in short gas-filled fibers
No full textThe intense few-cycle driving fields used to produce isolated attosecond pulses via high harmonic generation (HHG) [1] are typically delivered from conventional hollow fiber compressors. However, it has been suggested that individual attosecond pulses may be realized in low-pressure regions at the output of self-compressed filaments [2]. We follow a similar approach in an alternative geometry and present modelling of an elegant source of isolated attosecond pulses driven by a 40 fs near infrared (NIR) laser field. Here, ionization-induced self-compression and HHG happen in-situ within a short (40 mm) gas-filled fiber, and single 350 as pulses at a central wavelength of 13.5 nm are predicted at its exit
High-energy laser-pulse self-compression in short gas-filled fibers
No full textWe examine the spatiotemporal compression of energetic femtosecond laser pulses within short gas-filled fibers. The study is undertaken using an advanced nonlinear pulse propagation model based on a multimode generalized nonlinear Schrödinger equation that has been modified to include plasma effects. Plasma defocusing and linear propagation effects are shown to be the dominant processes within a highly dynamical mechanism that enables 100-fs pulses to be compressed into the few-cycle regime after <50 mm of propagation. Once the mechanism has been introduced, parameter spaces are explored and compressor designs suitable for performing high-field experiments in situ are presented. We finish by showing how these designs may be extended to novel wavelengths and driving pulses delivered by state-of-the-art high-repetition-rate lasers
High-power laser pulse compression for optimized high-harmonic generation in short hollow fibers
No full textHigh-harmonic generation (HHG) driven by high-power femtosecond lasers is a promising route towards tabletop sources of coherent radiation at extreme ultraviolet (XUV) and soft Xray wavelengths. In order to maximize conversion efficiency and to obtain attosecond pulse lengths of the harmonics, pump pulse lengths down to the few-cycle regime are required. Traditionally, this has been achieved by nonlinear spectral broadening in gases and subsequent dispersion compression or by self-compression in laser-induced filaments. Here we investigate an alternative method that is simpler to implement experimentally, based on multimode non-linear propagation effects in short, centimeter-length, gas-filled hollow fibers operating in the high-ionization regime
Few-cycle self-compression via multimode nonlinear optics in gas filled waveguides
No full textMultimode simulations predict dramatic ionization-induced self-compression of high energy ultrashort pulses within short gas filled capillaries. The mechanism observed allows for the temporal compression of 53 fs pulses into the few-cycle regime
Criminal anthropology of mariticide in Russia. Foreword to the article by P.N. Tarnovskaya “Female criminality in connection with early marriages”
No full textObjective: to provide a general overview of the content of P.N. Tarnovskaya’s article “Female criminality in connection with early marriages”, to determine its place in its author’s heritage and its scientific value for modern criminology.Methods: the general scientific method of dialectical cognition, comparison, as well as the formal logical method (deduction, induction, definition and division of concepts).Results: having analyzed the content of P.N. Tarnovskaya’s article, the author determined its significance as the initial stage of forming her anthropological concept in the study of female murderers. The author specified the sections of P.N. Tarnovskaya’s monograph “Women-murderers” (1902), which use the results of the research described in the article under study. The author refuted the opinion, previously prevailing in Russian criminology, that anthropological research by P.N. Tarnovskaya was supposed to use biological means to prevent crime. On the contrary, in this work Tarnovskaya recommended changing the social environment to curb female criminality (mariticide), namely, abandoning the widespread early marriages of adolescent women before the end of puberty.Scientific novelty: for the first time, the author gives a criminological assessment of P.N. Tarnovskaya’s article “Female criminality in connection with early marriages” and indicates its links with her subsequent works.Practical significance: the results obtained make it possible to change the perception of research by P.N. Tarnovskaya’s as one of the founders of world criminological science. In her concept of crime prevention, the impact on general social factors on female criminality was considered fundamental for the prevention of women’s deviant behavior
Bright extreme-ultraviolet high-order-harmonic radiation from optimized pulse compression in short hollow waveguides
No full textMultimodal nonlinear propagation dominates the evolution of intense laser pulses propagating in high pressure gas-filled capillaries used for high harmonic generation. A fully multimodal nonlinear propagation model is used to predict pulse evolution along such a capillary, and the length and pressure distribution optimised to produce the shortest pulses at the capillary output. This optimisation is shown theoretically to result in self compression of the pulse from ~53 fs to ~7 fs, and shown experimentally to increase the flux of high harmonic radiation from the capillary by an order of magnitude over comparable capillary and gas jet designs
Re-engagement in Psychotherapy for PTSD in Veterans
No full textThis infographic summarizes the findings of:
Buchholz, K.R., Bohnert, K.M., Pfeiffer, P.N., Valenstein, M., Ganoczy, D., Anderson, R.E., & Sripada, R.K. (2017). Reengagement in PTSD psychotherapy: A case-control study. General Hospital Psychiatry, 48, 20-24. doi: 10.1016/j.genhosppsych.2017.06.009https://commons.und.edu/psych-pp/1000/thumbnail.jp
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