8,191 research outputs found
F. G. Bartlett, J. E. Thomas
No full textProfessor F. G. Bartlett (far left) is shown with J. E. Thomas (third from left) and three other people who are unidentified.https://scholarsjunction.msstate.edu/ua-photo-collection/6381/thumbnail.jp
Bartlett corrections in stationary VARs
No full textWe derive the Bartlett correction for a simple hypothesis on the regression parameters in a multivariate stationary autoregressive process. Three applications illustrate the use of the correction: the test for absence of autocorrelation of any order, a simple hypothesis on the autoregressive parameters and two tests for weak exogeneity in the cointegrated VAR model. In the first of these tests, the cointegration space is known, in the second it is not. The Bartlett correction performs well in all simulation studies, except in the one of the last test, that is a test for weak exogeneity in the cointegrated VAR with an unknown cointegration space.
[Second Lieutenant Benjamin F. Bartlett, Union Army]
No full textPortrait of Second Lieutenant Benjamin F. Bartlett, Company I, 42nd Massachusetts Infantry Regiment, United States Army. Bartlett enlisted on September 4, 1862 and on New Year’s Day 1863 was one of 260 Federal soldiers captured by Confederates at the Battle of Galveston. Bartlett was marched to Camp Groce, a prisoner of war camp on the Brazos River near Hempstead, Texas, where he died of disease on August 22, 1863. Source: Lawrence T. Jones III.Verso: [handwritten] [illegible] Bartlett [illegible] of Lieut B. F. Bartlett of the May Gaurds. Co. I 42d Reg. [stamped imprint] J. W. Black. 173 Washington St, Boston
Ampliphax grandis Bartlett & Kunz, 2015, new species
No full textAmpliphax grandis new species (Figures 1–4) Type locality. Costa Rica, Puntarenas Province, Estacion Pittier, near Cerro Gemelo, 1670m Diagnosis. A large, orange-stramineous species with a projected head, keeled lateral carinae of the vertex and terete antennae. Calcar large, foliaceous, with greater than 25 small, black-tipped teeth on the trailing margin. Male genitalia with simple parameres, a simple decurved aedeagus, and very large curved pair of appendages on the genital diaphragm. Description. Color. Uniformly orange-stramineous to orange-tan (some specimens weakly washed anteriorly with grey), paler in median regions of vertex, pro- and mesonotum. Macropterous wings clear to weakly infuscate. Structure. Macropter. Body length, male, without wings x = 3.11 mm (range 3.03–3.20, n= 3), with wings x = 5.19 mm (range 5.14–5.27, n= 4), forewings 4.12 mm (range 4.02–4.21, n= 3); female (without wings) x = 3.80 (range 3.61–4.12, n= 4), with wings 5.78 (range 5.67–5.85, n= 4). Head. Head narrower than pronotum. Vertex longer than wide (l: w 1.69: 1, n= 5). Head narrower than pronotum, in lateral view distinctly anteriorly projecting, appearing slightly upcurved. Carinae of head and thorax conspicuous, except Y-shaped and submedian carinae of vertex obsolete; lateral margins of vertex strongly carinate, meeting at fastigium. Frons rather parallel-sided about 3 × longer than wide (w:l 0.27: 1), widest near ventral margin of eyes, narrowed between eyes; carinae sharp, median carina of frons narrowly forked near fastigium. Antennal segment I about twice as long as wide, antennal segment II about 2 × longer than I (ratio I:II 0.45: 1) Thorax. Prothorax about 1 / 3 length of mesothorax (length ratio 0.37: 1); carinae evident, lateral carinae diverging, not reaching posterior margin. Mesonotum with carinae evident, reaching posterior margin, lateral carinae slightly diverging posteriorly. Forewing venation varying in details among individuals. Forewing with nodal line in distal third; Sc+R arising from leading margin of basal cell, forked into Sc+RA and RP near midlength of clavus, Sc forked from RA at nodal line, RA unbranched; RP unbranched or forked following nodal line; MP forked from SC+R+M (+CuA according to Nel et al., 2012, Bourgoin et al. 2015) at basal cell, abruptly angled at nodal line and subsequently to MP 1 + 2 and MP 3 + 4 at (or after) nodal line, some specimens with MP 3 + 4 subsequently branched; CuA arising from trailing margin of basal cell, forked into CuA 1 and CuA 2 distad of Sc+RA and RP fork; with CuA 1 branch often subsequently forked. Calcar large, flattened and foliaceous, narrowed distally, bearing continuous row of more than 28–35 black-tipped teeth on posterior lateral margin, subequal or exceeding length of metabasitarsus. Metabasitarsus slightly more than half length of tarsus (0.55: 1, n= 5). Abdomen. Pygofer in lateral view quadrate, taller than wide in lateral view; anterior margin truncate, caudal margin sinuate; ventrocaudal margin with elongate, scooplike projection. In caudal view, pygofer opening keeled, taller than wide; ventral margin of opening with prominent projection, ventrolateral margins strongly keeled. Diaphragm deeply emarginate medially, armature consisting of a pair of very large caudally declined scalpriform appendages arising from thickened base; avicephaliform in lateral view, U-shaped in caudal view. Parameres narrow, flattened, parallel-sided, basal angles obscure; diverging in basal two-thirds, angled dorsal in apical third, apex abruptly angled lateral; apex truncate; in lateral view somewhat dorsocaudally directed. Aedeagus simple, decurved, parallel-sided and weakly flattened, bearing small subapical lateral flanges of few teeth. Abdominal segment X quadrate, bearing short, thick sharply-pointed processes on dorsocaudal angles; widely separated at base in caudal view; segment XI subequal to height of segment X. Remarks. Given its relatively large size and distinctive features, relatively few specimens of Ampliphax grandis have been found. Of the 32 specimens of this species recorded here, the sex ratio was highly biased toward females, with 26 females and 6 males. The few specimens with reported collection methods came from lights, although some specimens collected by F. S. Blanton had debris on them suggesting they were obtained from Malaise traps. No host plants have been recorded. A general zoogeographic pattern found in Costa Rica has been that different, but closely related, species are found among the Pacific tropical dry forest (lowland) region, the higher elevations (especially the Talamanca Mountains), and the Atlantic lowlands. We considered this pattern, but available evidence suggests a single species. However, the available evidence is limited because all the specimens from Guanacaste and Alajuela provinces, Costa Rica (in the northwest), were female, as were available specimens from Panama. The genitalia of the 6 males (from Limon, Puntarenas, and Heredia provinces, Costa Rica) were similar. The most notable differences were that the holotype (from Puntarenas, 1670 m), had a more pointed aedeagus and longer processes on segment X than the specimen illustrated (Heredia, ~ 60 m). Also, DNA barcodes show that the holotype has less than 1 % difference from a specimen from Limon (10 m elevation). A single female specimen from the Dominican Republic was excluded from the paratype series because of its disjunct range. A specimen from Laguna Medio Queso, Costa Rica was excluded because it was in poor condition. The holotype has been DNA barcoded with the full 658 bp sequence available on BOLD (process id ASIHE 1471 – 12, BIN URI ABZ 9263). Reported hosts. None. Distribution. Costa Rica, Panama (Fig. 4); also tentatively from Dominican Republic. Etymology. The specific epithet is from the Latin word grandis (large, great, magnificent), and has a common termination in masculine and feminine form. Type material examined. HOLOTYPE (male, INBio). COSTA RICA. Puntarenas, Est. / Pittier, 4.2 Km SO. del Cerro / Gemelo 1670m, 8–20 JUL 1997. / M. M. Moreaga. Red de Golpe / L_S_ 330900 _ 577400 # 47390 // [inverted barcode label] COSTA RICA / INBio / CRI 002 / 567442 // DNA Barcoding / E. Ulate / CCDB – 11593 D 10 // HOLOTYPE / Ampliphax / grandis / Bartlett & Kunz [red paper].” PARATYPES. COSTA RICA: Guanacaste: Rio Pedregal, Murcielago, A.C.G., P.N. Santa Rosa, 100 m, Nov 1993, F. Munoz, L N [Lambert north] 320300 347200 # 2506 (4 f INBio); Rincón del Vieja, National Park Rincón de la Vieja, N 10 ° 45´15 ´´; W 85 ° 21´00´´, 635m, 10 June 2008, G. Kunz (1 f, photographs, Fig. 1); Heredia: La Selva, 50 m, 0 1 Sep 1998, C. W. & L. B. O'Brien, at light (1 f, LBOB). near Puerto Viejo, La Selva Biological Station, 10.41667 ° N 84 ° W, 55 m, 17 Aug 2003, C.R Bartlett, J. Cryan and J. Urban (1 f, UDCC); same, 23 Feb 2004 – 02 Mar 2004 (1 f, UDCC); same, 25–26 Feb 2004, C. R. Bartlett (1 f, UDCC); same, 29 Feb 2004, C. R. Bartlett, mercury vapor light, Voucher NCSM tissue collection 09– 11–20 – 35 (1m, UDCC, 1 f, NCSM, in alcohol); Limon: Est[acion] Cuatro Esquinas, P. N. Tortuguero, Jun 1990, E. Quesada, L N 280000, 590500 (1 f, INBio); Sector Cedrales de la Rita, 3 km N del Puente Rio Suerte, Ruta Puerto Lindo, 10 m, Jan 1997, E. Rojas, L N 278600, 566500 (2 f, INBio, CRI 002545535 DNA barcoded); same, Feb 1997 (1 f, 2m INBio); same, Apr 1997 (3 f, 1m INBio); Puntarenas: Estacion Pittier, 4.2 Km SW del Cerro Gemelo, 1670 m, 08– 20 Jul 1997, M. M. Moreaga, Red de Golpe, L S [Lambert south] 330900, 577400 (1m, INBio); Estacion Quebrada Bonita, Res. Biol. Carara, 50 m, May 1990, R. Zuniga, [L S?] 194500, 469850 (1 f, INBio); Quepos, P.N. Manuel Antonio, 80 m, Feb 1991, R. Zuniga, L S 370900, 448800 (1 f, INBio, CRI 000312790 barcoded). PANAMA: Chiriqui: David, Oct 1959, N. L. H. Krauss (1 f, USNM); Cocle: El Retiro, 10 Nov 1952, F. S. Blanton (1 f, USNM); Pt. [Port of] Aguadulce, 21 Nov 1952, F. S. Blanton (1 f, USNM); Panama: Tocumen, 20 Dec 1951, F. S. Blanton (3 f, USNM). Other material examined. COSTA RICA: Alajuela: Laguna Medio Queso, 0–100 m, 0 1 Sep 2005, Y. Cardenas, J. Azofeifa, M. Moraga, Red Noyes, L N [Lambert north] 334350, 461100, # 84534 (1 f, INBio). DOMINICAN REPUBLIC: San Cristóbal Province, San Cristóbal, July 1969, J. Maldonado C. (1 f, USNM) (excluded from paratypes). Molecular data. Three specimens of this species from Costa Rica (viz. CRI 000312790, CRI 002567442, CRI 002545535) have been DNA barcoded by INBio (a 648 base-pair region in the mitochondrial cytochrome c oxidase 1 gene) with data reported in the Barcode of Life Database (BOLD, www.boldsystems.org; Ratnasingham & Hebert 2007, 2013) as part of the Delphacidae Costa Rica INBio Collection (DELCR) project. The sequences differ from each other with a p-distance of less than 1 %. The nearest neighbor in BOLD is Bostaera balli with a pdistance statistic given at 13.96 %, indicating that no taxon closely related to Ampliphax has been barcoded. Pareuidella and ‘ Euides ’ were among the taxa with barcode data in BOLD (but not Neoperkinsiella among specimens with determinations). BOLD has barcode data for 1,261 specimens, barcodes representing 287 species, in comparison to approximately 576 currently described New World delphacid species (2100 + species worldwide, Bourgoin 2014), suggesting that the closest relatives to Ampliphax may not be barcoded to date.Published as part of Bartlett, Charles R. & Kunz, Gernot, 2015, A new genus and species of delphacid planthopper (Hemiptera: Fulgoroidea: Delphacidae) from Central America with a preliminary regional species list, pp. 510-518 in Zootaxa 3946 (4) on pages 512-516, DOI: 10.11646/zootaxa.3946.4.2, http://zenodo.org/record/23922
Ground state potential energy surfaces and bound states of M-He dimers (M=Cu,Ag,Au): A theoretical investigation
No full textWe present an ab initio investigation on the ground state interaction potentials [potential energy surface (PES)] between helium and the group 11 metal atoms: copper, silver, and gold. To the best of our knowledge, there are no previous theoretical PESs proposed for Cu-He and Au-He, and a single one for Ag-He [Z. J. Jakubek and M. Takami, Chem. Phys. Lett. 265, 653 (1997)], computed about 10 years ago at MP2 level and significantly improved by our study. To reach a high degree of accuracy in the determination of the three M-He potentials (M=Cu,Ag,Au), we performed extensive series of test computations to establish the appropriate basis set, the theoretical method, and the computational scheme for these systems. For each M-He dimer we computed the PES at the CCSD(T) level of theory, starting from the reference unrestricted Hartree-Fock wave function. We described the inner shells with relativistic small core pseudopotentials, and we adopted high quality basis sets for the valence electrons. We also performed CCSDT computations in a limited set of M-He internuclear distances, adopting a medium-sized basis set, such as to define for each dimer a CCSD(T) to CCSDT correction term and to improve further the quality of the CCSD(T) interaction potentials. The Cu-He complex has minimum interaction energy (E(min)) of -28.4 mu hartree at the internuclear distance of 4.59 A (R(min)), and the short-range repulsive wall starts at 4.04 A (R(E=0)). Quite interestingly, the PES of Ag-He is more attractive (E(min)=-33.8 mu hartree) but presents nearly the same R(min) and R(E=0) values, 4.60 and 4.04 A, respectively. The interaction potential for Au-He is markedly deeper and shifted at shorter distances as compared to the lighter complexes, with E(min)=-69.6 mu hartree, R(min)=4.09 A and R(E=0)=3.60 A. As a first insight in the structure of M-He(n) aggregates, we determined the rovibrational structure of the three M-He dimers. The Cu-He and Ag-He potentials support just few rotational excitations, while the Au-He PES admits also a bound vibrational excitation
XMM-Newton observation of the highly magnetised accreting pulsar Swift J045106.8-694803: evidence of a hot thermal excess
No full textSeveral persistent, low luminosity (LX ~ 1034 erg s-1), long spin period (P > 100 s) High Mass X-ray Binaries have been reported with blackbody components with temperatures > 1 keV. These hot thermal excesses have correspondingly small emitting regions (< 1 km2) and are attributed to the neutron star polar caps. We present a recent XMM-Newton target of opportunity observation of the newest member of this class, Swift J045106.8-694803. The period was determined to be 168.5 ± 0.2 s as of 17 July 2012 (MJD = 56125.0). At LX ~ 1036 erg s-1, Swift J045106.8-694803 is the brightest member of this new class, as well as the one with the shortest period. The spectral analysis reveals for the first time the presence of a blackbody with temperature kTBB = 1.8 +0.2-0.3 keV and radius RBB = 0.5 ± 0.2 km. The pulsed fraction decreases with increasing energy and the ratio between the hard (> 2 keV) and soft (< 2 keV) light curves is anticorrelated with the pulse profile. Simulations of the spectrum suggest that this is caused by the pulsations of the blackbody being ~ π out of phase with those of the power law component. Using a simple model for emission from hot spots on the neutron star surface, we fit the pulse profile of the blackbody component to obtain an indication of the geometry of the system
The totemic use of an author in psychology: A century of publications of the work of F. C. Bartlett
No full textInternational audienceWe have tried to retrace the contributions and dissemination of the work of the famous British psychologist F. C. Bartlett through various authors who have been inspired by his work, to a greater or lesser extent. To investigate these questions, we have chosen to carry out a bibliometric work. We were interested in the scientific articles available via the electronic library services (offered by the university and via Google Scholar). The only criterion that guided us in the inclusion in the corpus was the explicit nominative reference to Frederic Charles Bartlett on the whole article. The corpus collected (n = 731) concerns a period of almost a century (1920-2019). The results reveal two periods of increased publication, in 1985 (n = 20) and 2019 (n = 137). Nevertheless, while the name of the author is increasingly cited, most of the time it is only once in the body of the articles. A form of scientific automatism manifests itself in the form of a brief, systematic and automatic citation of the first edition of only one of his books. This "mystified" usage may well extend beyond this author, since Lewin is subject to the same stereotypical quotations and paradoxical marginalization in French-language social psychology textbooks (Pétard et al., 2001)
War of Ghosts: Marshall, Veblen and Bartlett
No full textThe article discusses the historical relationship between economics and the tradition of experimental psychology established at Cambridge University. At the same time, we explore how the Cambridge model of the mind was implemented in the United States by Thorstein Veblen, who claimed instinct theory as a novel foundation for his evolutionary-institutional economics. While Veblen identified Alfred Marshall's economics with an older version of psychology, our comparison of the psychological thought of these two economists, as well as our investigation into the social dimensions and possibilities of the Cambridge psychological tradition as developed in the early twentieth century by F. C. Bartlett, points to substantial common ground
Covalent attachment of osmium complexes to glucose oxidase and the application of the resulting modified enzyme in an enzyme switch responsive to glucose
No full textPyridine-based osmium complexes bearing either a carboxylate or aldehyde group were covalently attached to glucose oxidase and were shown to work as mediators for the reoxidation of the enzyme. For the complex containing the carboxylate group, the binding was made through carbodiimide coupling to the amine residues in the protein. For the complex containing the aldehyde group, the reductive coupling was carried out by condensation with the amino groups on the protein in the presence of sodium cyanoborohydride, Electrochemical studies show evidence for both intramolecular and intermolecular redox mediation for the electrochemical reoxidation of the modified glucose oxidases in the presence of glucose. The modified enzymes adsorbed on glassy carbon and platinum show different electrochemical responses for the two electrode materials, suggesting that orientation of the adsorbed enzyme is induced due to the interaction of the osmium complex with the different surfaces. Construction of enzyme switches based on these modified enzymes was carried out, and their responses were compared with those obtained using native glucose oxidase and a soluble redox mediator
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