5,963 research outputs found
C-Branched pyrrolidines from 2-C-acetylmethyl-glycosylazides. Reduction of imines formed by monosaccharide ring opening
No full textCuculicola calyptocamptus Gustafsson & Tian & Zou 2021, new species
No full textCuculicola calyptocamptus new species (Figs 1–6) Type host: Hierococcyx sparverioides (Vigors, 1832) —large hawk-cuckoo (Cuculidae). Type locality: “White Pheasant Formation”, Basa Village, Hekou Township, Hekou County, Honghe Prefecture, Yunnan Province, China. Diagnosis. Cuculicola calyptocamptus is close to Cuculicola erythrophthalmus Emerson, 1964 and Cuculicola kui Kettle, 1980 in lacking ventral extensions in the distal endomere and having a small overlap between the endomere and the penile arms. However, Cuculicola calyptocamptus can be separated from those species by having the median section of the ventral carina diffuse and displaced anteriorly to form a rudimentary clypeo-labral suture (Fig. 3); the dorsal endomeral arms are stouter in C. calyptocamptus (Fig. 4) than in C. erythrophthalmus. In addition, Cuculicola calyptocamptus can be separated from C. erythrophthalmus by the following characters: sternites III–VI of both sexes with only 1–2 sts on each side in C. calyptocamptus (Figs 1–2), but with 3 sts on each side in C. erythrophthalmus; male tergopleurites VI–VII with 2 tergocentral setae on each side in C. calyptocamptus (Fig. 1), but with 3 tergocentral setae on each side in C. erythrophthalmus; parameres with distinct “elbow” in C. calyptocamptus (Figs 4–5), but gently rounded in C. erythrophthalmus; female vulval margin more concave and with setae more evenly distributed along margin in C. erythrophthalmus than in C. calyptocamptus (Fig. 6). Moreover, Cuculicola calyptocamptus can be separated from C. kui by the following characters: marginal carina broader in C. calyptocamptus (Fig. 3) than in C. kui; female sternites IV–V with 3 sts on each side in C. kui, but with 2 sts on each side in C. calyptocamptus (Fig. 2); frons more evenly rounded in C. calyptocamptus (Fig. 3) than in C. kui; endomere with somewhat elongated distal end in C. calyptocamptus (Fig. 5), but with flattened distal end in C. kui. In the original illustrations of C. kui, the parameres appear to have a distinct bend at about midway, similar to those of C. calyptocamptus (Fig. 4), but the parameres are more slender in C. kui than in C. calyptocamptus (Fig. 4), and the bend in the parameres is more abrupt, and with a more angular outer margin, in C. calyptocamptus than in C. kui. Description. Both sexes. Head about equally wide in pre- and postantennal sections, frons rounded (Fig. 3). Marginal carina broad throughout, with distinct canals to apertures of most preantennal setae. Dorsal preantennal suture present, curved. Ventral carina interrupted near midline, and appears to curve anteriorly, but this section diffuse, and exact shape unclear. Head chaetotaxy as in Fig. 3. Thoracic and abdominal segments and chaetotaxy as in Figs 1–2. Measurements as in Table 1. Male. Basal apodeme relatively short for genus, tongue-like (Figs 4–5); in distal section with ventral folds that appear to connect to penile sclerites. Endomere without distal extensions, and with proximal extensions rather stout. Penile sclerites barely overlapping with endomere. No setae or sensilla visible on endomere or near base of penis in examined specimens. Parameres with characteristic bend at about midway, overlapping distally; pst1–2 sensilla. Female. Subgenital plate short, distal margin rounded and bulging slightly (Fig. 6). Vulval margin with poorly sclerotized plates along most of margin, but interrupted medianly; margin with shallow concavity medianly. Vulval chaetotaxy as in Fig. 6, with 4–6 long, slender vms and 2–3 long, slender vss on each side; 1–2 minute setae proximal to vss, often visible only as apertures; vos variable among specimens, generally with 2–3 medium-sized, slender setae on each side situated between subgenital plate and vss. Etymology: The species epithet is formed by “ kalupto ”, Greek for “to cover”, and “ kampto ”, Greek for “I bend”. This refers to the pronounced bending of the parameres, which are normally hidden inside the body. Type material. Ex Hierococcyx sparverioides: Holotype ♂, “White Pheasant Formation”, Basa Village, Hekou Township, Hekou County, Honghe Prefecture, Yunnan Province, China, 6 Jun. 2016, Wu Yuchun & Chu Xingzhi, GD-PHTH-00565 (IZGAS). Paratypes: 12♂, 51♀, same data as holotype, GD-PHTH00566–00627 (IZGAS).Published as part of Gustafsson, Daniel R., Tian, Chunpo & Zou, Fasheng, 2021, New species of ischnoceran chewing lice (Phthiraptera: Philopteridae) from Chinese birds, pp. 305-328 in Zootaxa 4990 (2) on pages 306-309, DOI: 10.11646/zootaxa.4990.2.6, http://zenodo.org/record/502655
Zou Zhengjun yi shu /
No full textImprint date from preface.[v. 1] Xue ji yi de : 2 juan Bu xiao er ya shi du liang heng -- [v. 2] Ge shu bu Dui shu chi ji Cheng fang jie shu : 3 juan cun gao -- [v. 3]-[v. 4] Xia dai suan xue si zhong : Shao guang zhui zao Dong fang shu tu jie 2 juan Zhi qu shu Zhi qu tu jie / Xia Luanxiang Xu shi suan xue san zhong : Zao ge biao jian fa Jie qiu jie yi Tuo yuan jiu zhou shu / Xu Youren.Mode of access: Internet.E.A.L. copy incomplete: Yu di quan tu and Chi dao nan bei heng xing tu called for by table of contents wanting
Skin-Stiffener Separation in T-Stiffened Composite Specimens in Postbuckling Condition
No full textAn experimental and numerical investigation was conducted to study the skin-stiffener separation of single T-shape stiffener specimens in postbuckling condition. Three specimens were manufactured with a centrally located Teflon insert, and were loaded in compression until collapse. Deformation patterns and separation evolution were monitored during the tests. To measure the full-field displacements and the strain distributions of the specimens, a digital image correlation (DIC) system was used. Skin-stiffener separation was observed and measured with an ultrasound system. Finite-element (FE) analyses were conducted to capture interlaminar damage mechanism based on the virtual crack closure technique. The numerical analysis accurately predicted the postbuckling deformation and the skin-stiffener separation behavior. The close correlation between the experimental and numerical results allows for further exploitation of the strength reserve in the postbuckling region and wider design options for the next generation of composite aircraft designs.</p
Stereoselective synthesis of dioxabicycles from 1-C-allyl-2-O-benzyl-glycosides — An intramolecular cyclization between 2-O-benzyl oxygen and the allyl double bond
No full textMicrostructural evolution and microhardness variations in a Cu–36Zn–2Pb alloy processed by high-pressure torsion
No full textA coarse-grained Cu–36Zn–2Pb alloy with an initial grain size of ~54 µm was processed by high-pressure torsion (HPT) at room temperature under an applied pressure of 6.0 GPa through 1–10 turns, and the evolution of microstructure and microhardness was investigated. Analysis by X-ray diffraction (XRD) showed that in HPT processing the β'-phase transforms to an α-phase and a {111} texture is formed. Microscopic examination showed that dislocations were first formed at equivalent strains of not more than ~25 and when the equivalent strain increased to ~40 there was evidence for twins and secondary twinning. Fine grains were formed with an increase in equivalent strain to ~100 and with further straining these refined grains acted as precursors for additional grain refinement. The refined equiaxed grain size was ~250 nm after HPT through an equivalent strain of ~100 and the results show the microhardness reached a saturation value of ~220 Hv
The enhancement of the perception of saltiness by umami sensation elicited by flavor enhancers in salt solutions
No full textHealth concerns related to the intake of salt have encouraged the investigation into sodium reduction by examining the taste-taste interaction between the perception of saltiness and umami. The effect of saltiness enhancement and sodium reduction of four kinds of umami carrier (WSA, MSG, IMP, and I + G) in a salt model solution with different salt concentrations (2.03-13.94 g/L) were investigated using the two-alternative forced choice (2-AFC) and generalized Labeled Magnitude Scale (gLMS). The saltiness difference thresholds (DT) under different umami carrier were further explored using the constant stimuli method. The results showed that umami carriers had effective effects of saliness enhancement in the salt solutions with different concentrations, and higher enhancemen levels were obtained at larger salt concentrations. The level of saltiness enhancement were varied between the different umami intensity and carriers, and WSA carrier with moderate intensity had the maximum sodium reduction percentages which reached to 24.25%. Besides, the DT values of saltiness taste were increased under umami carrier, which means that more salt can be reduced without evoking a variation in saltiness. The present work not only provided insight into the effect of umami chemicals on the saltiness perception and saltiness DT values but also presented valuable information regarding flavor when developing low sodium foods and contributing to the development of more healthful products that meet current nutritional recommendations
Optical PAM-4 signal generation using a silicon Mach-Zehnder optical modulator
No full textAn analytic model is proposed to study the linearity performance of the silicon Mach-Zehnder optical modulator. According to the simulation results, we optimize the width of the silicon rib waveguide and the location of the PN junction to improve the linearity performance. The fabricated silicon Mach- Zehnder optical modulator has a spurious free dynamic range of 113.3 dB.Hz(2/3) and 88.9 dB.Hz(1/2) for the third-order intermodulation distortion and the second-order harmonic distortion. We also demonstrate the optical fourlevel pulse-amplitude-modulation (PAM-4) signal generation through the device. The generated optical PAM-4 signal is characterized at the rates up to 35 Gbaud. The BERs of the optical PAM-4 signals can reach 5.2x10(-6) at 20 Gbaud and 6.6x10(-5) at 32 Gbaud, which are much lower than the threshold of hard decision forward error correction (3.8x10(-3)). (C) 2017 Optical Society of AmericaProgram 863 [2015AA015503, 2015AA017001]; National Key R&D Program of China [2017YFA0206402, 2016YFB0402501]; National Natural Science Foundation of China (NSFC) [61535002, 61505198, 61235001, 61575187, 61377067]SCI(E)ARTICLE1923003-230132
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