222,417 research outputs found
Alebroides spanner Yu & Yang, sp. nov.
No full textA. spanner Yu & Yang, sp. nov. Distribution. China (Guizhou).Published as part of Yu, Xiaofei & Yang, Maofa, 2014, Four new species of Alebroides Matsumura (Hemiptera: Cicadellidae: Typhlocybinae) from China, pp. 248-262 in Zootaxa 3780 (2) on page 252, DOI: 10.11646/zootaxa.3780.2.2, http://zenodo.org/record/23041
Alebroides strumae Yu & Yang, sp. nov.
No full textA. strumae Yu & Yang, sp. nov. Distribution. China (Tibet).Published as part of Yu, Xiaofei & Yang, Maofa, 2014, Four new species of Alebroides Matsumura (Hemiptera: Cicadellidae: Typhlocybinae) from China, pp. 248-262 in Zootaxa 3780 (2) on page 252, DOI: 10.11646/zootaxa.3780.2.2, http://zenodo.org/record/23041
Alebroides chiasmaticus Yu & Yang, sp. nov.
No full textA. chiasmaticus Yu & Yang, sp. nov. Distribution. China (Guangxi).Published as part of Yu, Xiaofei & Yang, Maofa, 2014, Four new species of Alebroides Matsumura (Hemiptera: Cicadellidae: Typhlocybinae) from China, pp. 248-262 in Zootaxa 3780 (2) on page 251, DOI: 10.11646/zootaxa.3780.2.2, http://zenodo.org/record/23041
Manipulate light propagation based on gradient-phase meta-interfaces
No full text超穎材料(plasmonic metamaterials)由次波長(sub-wavelength)尺寸的侷域共振結構組成，這些共振結構隨電磁波激發產生電偶(electric dipole)及磁偶極矩(magnetic dipole)共振，並展現一些特殊的電磁波特性如負折射(negative refraction)、完美成像(perfect imaging)等。近年來藉由一種介面梯度超穎材料(graded metamaterial systems)，實現許多新穎的現象如影形斗篷(invisibility cloaking)及侷域彩虹(trapped rainbow)等。近年來N. Yu等人根據Generalized Snell’s law的理論基礎設計了尺寸漸變的奈米天線(optical antenna)振列，並在近紅外光(8微米)波段實現異常(anomalous)穿透與反射的調控效果。X. Ni等人以類似的結構將尺寸縮小使之於波長2微米工作，並具有寬頻(broadband)工作的特性。 Sun 等人透過一種反射式的結構於微波(microwave)波段將入射的傳遞波近乎100%轉為表面波。這系列研究主要是透過不同尺寸的超穎材料在介面上不同位置產生漸變的電磁波相位(phase)，並在遠場干涉(interference)後建構出特定指向的平面波前(wave front)。
在此研究中透過模擬設計介面結構，使結構將正向入射平面波高效率(78%)調控到異常反射角度，並在850nm光頻段工作下具有200nm的寬頻調控效果。此設計結構的調控特性可應用於分光元件(beam splitter)、表面電漿波耦合器(SPP coupler)及光吸收元件(light absorber)等。Plasmonic metamaterials are artificial composites made by sub-wavelength local resonance structures of electric and/or magnetic type(s) exhibiting novel electromagnetic properties, such as negative refraction, perfect imaging, etc. In last several years, various graded metamaterial systems have brought us new fascinating phenomena such as invisibility cloaking [1], trapped rainbow [2], etc. Recently, N. Yu et. al. showed that a graded optical antenna array could realize anomalous reflection and refraction for light at infra-red (8 micrometer), following a generalized Snell’s law [3], and X. Ni et. al. soon pushed the idea to 2-micrometer wavelength with a relative broad operation bandwidth [4]. Sun et. al. further proved that a particular gradient-index meta-surface can convert a propagating wave to a surface wave with nearly 100% efficiency [5], and demonstrated the idea in microwave frequency regime. The key idea behind this set of works is to utilize the local reflection/refraction phase properties of a gradient metamaterial, so that coherent beams can be formed by constructive interference.
In this work, we push the idea to visible frequencies. We designed and fabricated a graded meta-surface working around 850 nm, and demonstrated that an incident beam can be redirected to a non-specular channel after reflection by our system. The measured conversion efficiency from the incident beam to the anomalous reflection one is quite high (up to 78%), and the working bandwidth is very broad (about 200 nm). We believe that our systems can have broad applications including beam splitter, SPP coupler, light absorber, etc
Alebroides spanner Yu & Yang, sp. nov.
No full textA. spanner Yu & Yang, sp. nov. (Figs 38–47) Type material. Holotype, ♂, Kuankuoshui Nature Reserve, Guizhou, 13. August. 2010, collected at light by Xiaofei Yu. Length: ♂ 3.9mm. Crown yellowish (Fig 38). Ocellus surrounded with off-white stripe (Fig 40). Coronal suture brownish, not reaching apex of crown (Fig 38). Face yellowish (Fig 39). Pronotum with irregular spots at anterior margin, semitransparent posteriorly (Fig 38). Scutellum yellowish (Fig 38). Forewing yellowish, semitransparent; hindwing hyaline (Fig 38). Abdomen yellowish. Legs yellowish except claws brown. Male ventral abdominal apodemes protruding into segment 7 (Fig 41). Male pygofer with setae; ventral pygofer appendage curved, with dense pubescence, beyond pygofer; dorsal bridge less than 1 / 3 length of pygofer (Fig 42). Subgenital plate exceeding pygofer, with 2 rows of 22 macrosetae, 3 rows of ca. 32 long and feeble microsetae, ca. 25 marginal microsetae and 5 basal group macrosetae (Fig 43). Paramere elongate, sinuate, apex with few teeth, with setae and sensory pits subapically (Fig 44). Aedeagus expanded from midlength to apex and apically emarginate in dorsal view (Figs 45, 46). Anal tube process spanner-shaped, two processes nearly equal length (Fig 47). Connective longer than wide with shallow posterior emargination. Etymology. The new species name alludes to anal tube process branched and spanner-shaped. Remarks. The new speices is similar to A. falcatus Sohi & Dworakowska, but it is different from the latter in having the pygofer appendage with dense pubescence (Fig 42) and the anal tube process branched and spannershaped (Fig 47).Published as part of Yu, Xiaofei & Yang, Maofa, 2014, Four new species of Alebroides Matsumura (Hemiptera: Cicadellidae: Typhlocybinae) from China, pp. 248-262 in Zootaxa 3780 (2) on page 250, DOI: 10.11646/zootaxa.3780.2.2, http://zenodo.org/record/23041
Soil relative air permeability and water retention
No full textData set provides information about capillary pressure-saturation-relative air permeability for thirty one soil samples.
And the introduction of the data source compiled in the Excel file (31 Measured data sets_relative air permeability and water retention.xlsx):
1. The data sets of Brooks and Corey (1964, 1966) were retrieved from literature by Zhenlei Yang ([email protected]).
2. The data sets of Collis-George (1953), Touma and Vauclin (1986), Stonestrom (1987), and Dury (1997) were retrieved from literature by Xingxing Kuang ([email protected]).
3. The data sets of Tuli and Hopmans (2004) and Tuli et al. (2005) were generously shared and provided by Jan W. Hopmans ([email protected])
Soil relative air permeability and water retention
No full textData set provides information about capillary pressure-saturation-relative air permeability for twenty five soil samples.
And the introduction of the data source compiled in the Excel file (25 Measured data sets_relative air permeability and water retention.xlsx):
1. The data sets of Brooks and Corey (1964, 1966) were retrieved from literature by Zhenlei Yang ([email protected]).
2. The data sets of Touma and Vauclin (1986), Stonestrom (1987), and Dury (1997) were retrieved from literature by Xingxing Kuang ([email protected]).
3. The data sets of Tuli and Hopmans (2004) and Tuli et al. (2005) were generously shared and provided by Jan W. Hopmans ([email protected])
Soil relative air permeability
No full textData set provides information about capillary pressure-saturation-relative air permeability for thirty soil samples.
And the introduction of the data source compiled in the Excel file (Measured data sets_relative air permeability and water retention.xlsx):
1. The data sets of Brooks and Corey (1964, 1966) were retrieved from literature by Zhenlei Yang ([email protected]).
2. The data sets of Collis-George (1953), Touma and Vauclin (1986), Stonestrom (1987), and Dury (1997) were retrieved from literature by Xingxing Kuang ([email protected]).
3. The data sets of Tuli and Hopmans (2004) and Tuli et al. (2005) were generously shared and provided by Jan W. Hopmans ([email protected])
Guo li zhong yang da xue jiao yu xue yuan xin li xue xi gai kuang.
No full textCover title.; Special collection from London Missionary Society.; Also available in an electronic version via the Internet at http://nla.gov.au/nla.gen-vn1973394
Membranacea distincta Yu & Yang, sp. nov.
No full textMembranacea distincta Yu & Yang, sp. nov. (Figs 1–11) Length: male 4.1–4.2mm. Body robust, dorsal coloration golden yellow (Figs 1, 2). Crown with median black apical spot surrounded with cream stripe; coronal suture brown and margined with cream, beside with a brown spot (Figs 1, 3). Eyes dark (Figs 1, 2, 3). Ocellus present (Fig. 3). Face elongate and convex in profile (Fig. 2). Pronotum wider and longer than crown, with median cream spot at anterior margin (Fig. 1). Scutellum yellow with basolateral triangles and apex black; scutoscutellar sulcus distinct, not reaching lateral margin of scutellum (Fig. 1). Forewing rounded apically, apical cells less than 1 / 3 total length, RP and MP’ separated and originated from r cell, MP’’+CuA’ from m cell, width of c cell equal with r cell. Hindwing with CuA bifurcated. Abdomen brownish. Legs yellow except claws brownish (Figs 1, 2). Ventral male abdominal apodemes broad, reaching segment 4 (Fig. 4), Pygofer with dosrsal margin strongly concave, apex with few microsetae (Figs 5, 6). Subgenital plate broad, with an oblique line of 14 macrosetae and ca. 23 microsetae in 3 rows; outer margin bearing 5 moderately long and stout setae forming the basal group and after that along with ca. 25 marginal setae (Fig. 7). Paramere elongate, with apical teeth and setae (Fig. 8). Aedeagus arcuate in lateral view, with broad single central flange on ventral surface from midlength to apex (Fig. 9), subapically with pair of lateral flanges on each side, inner flange narrower than outer one; preatrium more than half length of shaft (Fig. 10). Connective with base broad, apex narrow, apical margin deeply emarginate (Fig. 10). Anal tube process only visible in ventral view (Fig. 11). Etymology. The new species is named for its single central flange broad and distinct. Material examined. Holotype, 1 ♂, Mt. Leigong, Guizhou Province, 5. July. 2005, coll. Yuehua Song. Paratypes, 1 ♂, Huaping, Guangxi Province, 18. May. 2012, coll. Hu Li; 2 ♂, Huaping, Guangxi Province, 18–19. May. 2012, coll. Zhihua Fan. Remarks. The new species is similar to M. stenoprocessa Yu & Yang, 2013 and M. plana Qin & Zhang, 2011, but differs from the latter in having the single central flange broad and extending from midlength to apex, the narrower flange is inside the broader one (Figs 9, 10).Published as part of Yu, Xiaofei & Yang, Maofa, 2014, Key to species of the leafhopper genus Membranacea Qin & Zhang (Hemiptera, Cicadellidae, Typhlocybinae, Empoascini), with a new species from China, pp. 97-100 in Zootaxa 3878 (1) on page 99, DOI: 10.11646/zootaxa.3878.1.8, http://zenodo.org/record/22492
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