119,945 research outputs found
Using performance assessment in secondary school mathematics: an empirical study in a Singapore classroom
No full textThis article reports an exploratory study on using performance assessment in mathematics instruction in a high-performing secondary school in Singapore. An intact mathematics class participated in the study, and received chapter-based performance tasks as intervention during regular mathematics lessons for about one and a half school years. The performance tasks used included authentic and/or open-ended tasks. The students’ academic achievements and attitudes in mathematics were compared with a comparison class that did not receive the intervention. Both quantitative and qualitative data were collected, mainly through questionnaire surveys, performance task tests, conventional school exams, and interviews with students and teachers. The results suggest that the students receiving the intervention performed significantly better than their counterparts in solving conventional exam problems, and in general they also showed more positive changes in attitudes towards mathematics and mathematics learning. The students from the experimental class also expressed positive views about the benefits of using performance tasks in promoting their ability in higher order thinking, though no statistically significant difference was detected between the two classes of students in solving unconventional tasks before and after intervention. Overall, the results appear to support teachers’ using contextualised problems in real life situations and open-ended investigations in students’ learning of mathematic
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No full textThe liverwort genus Cyrtolejeunea A. Evans is reduced to synonymy under Cheilolejeunea (Spruce) Schiffn. because of the existence of a series of intermediate species, including Cheilolejeunea insecta Grolle & Gradst. sp. nov. from Bolivia and Brazil and Cheilolejeunea chenii R.L. Zhu & M.L. So from eastern China. The new combinations, Cheilolejeunea holostipa (Spruce) Grolle & R.L. Zhu comb. nov. and C. suzannensis (Grolle) Grolle & R.L. Zhu comb. nov., are proposed
Zhu Da Ming, Finals (Selections) and Jeffrey Kahane, Finals (Part 1), 6th Van Cliburn Competition (1981)
No full textPiano concerto no. 2 in C minor, op. 18. Allegro scherzando / Rachmaninoff (Zhu) -- Piano concerto no. 9 in E-flat major, K. 271. Allegro / Mozart ; Piano concerto no. 9 in E-flat major, K. 271. Andantino / Mozart (Kahane)
Colletes xizangensis Niu, Zhu & Kuhlmann 2013
No full textColletes xizangensis Niu, Zhu & Kuhlmann, 2013 (Figs 19B, 20A, 20B) Colletes xizangensis Niu, Zhu & Kuhlmann, 2013: 113 (holotype ♀: China, Xizang, Lhasa Shi [IZCAS]). Colletes xizangensis; Ascher & Pickering 2021. Diagnosis. The female of C. xizangensis (the male is still unknown) is unique among the Tibetan Colletes in having the face and mesosoma covered entirely with pale-yellow pubescence and the T1 with a complete apical band. Females of C. xizangensis closely resembles those of C. xuezhongi, but in the former the clypeal punctation is crowded (clypeus more sparsely (i=1.0–2.0 d) punctate in C. xuezhongi) and the T2 basal band is absent (T2 basal band present in C. xuezhongi). Females of C. xizangensis are also similar to those of C. inspersus, but the former are comparatively larger (HW 3.2–3.3 mm) then the former (HW 2.8–2.9 mm) and have the paraocular area without black hairs (paraocular area with pale-yellow and black hairs intermixed in C. inspersus). New records —none. Distribution. Western China (Xizang). DNA barcode. Unavailable. Floral hosts. Unknown. Remarks. The male of C. xizangensis remains unknown.Published as part of Ferrari, Rafael R., Niu, Ze-Qing, Kuhlmann, Michael, Zhang, Dan & Zhu, Chao- Dong, 2021, The cellophane bees of Colletes Latreille (Hymenoptera: Colletidae) from Xizang (Tibet), China, pp. 1-72 in Zootaxa 5022 (1) on pages 34-35, DOI: 10.11646/zootaxa.5022.1.1, http://zenodo.org/record/522666
Colletes inspersus Niu, Zhu & Kuhlmann 2013
No full textColletes inspersus Niu, Zhu & Kuhlmann, 2013 (Figs 8C, 10A, 10B) Colletes inspersus Niu, Zhu & Kuhlmann, 2013b: 113 (holotype ♀, China, Xizang, Markam Xian [IZCAS]). Colletes inspersus; Ascher & Pickering 2021. Diagnosis. The female of C. inspersus (the male remains unknown) may be diagnosed through the following combination of features: bees relatively small (HW 2.6–2.7 mm), T1 finely and very sparsely (i=2.0–3.0 d) punctate medially and T2 without basal. Females of C. inspersus are similar to those of both C. xuezhongi and C. xizangensis, from which they can be differentiated by the paraocular area with pale-yellow and black hairs intermixed (paraocular area with only pale hairs in females of C. xuezhongi and C. xizangensis). Colletes inspersus can be further distinguished from C. xuezhongi by the clypeus longer than broad (clypeus broader than long in females of C. xuezhongi) and from C. xizangensis by the T1 with a broadly interrupted apical band (T1 apical band complete in females of C. xizangensis). Material examined. Published records — CHINA, Xizang: Markam Xian, 29.10 98.50, 3800 m, 20.vi.1976, YH Han, 1 ♀; XZ Zhang, 1 ♀. New records —none. Distribution. Western China (Xizang). DNA barcode. Unavailable. Floral hosts. Unknown. Remarks. The male of C. inspersus remains unknown.Published as part of Ferrari, Rafael R., Niu, Ze-Qing, Kuhlmann, Michael, Zhang, Dan & Zhu, Chao- Dong, 2021, The cellophane bees of Colletes Latreille (Hymenoptera: Colletidae) from Xizang (Tibet), China, pp. 1-72 in Zootaxa 5022 (1) on page 21, DOI: 10.11646/zootaxa.5022.1.1, http://zenodo.org/record/522666
Supporting data for "3D Printed Deformable Sensors"
No full textFull description in the file "ZhuReadme.txt".The data set includes the experimental data and the corresponding code files supporting the results reported in Zhijie Zhu; Hyun Soo Park; Michael C. McAlpine. 3D Printed Deformable Sensors. Sci. Adv., 2020, DOI: 10.1126/sciadv.aba5575.
The ability to directly print compliant biomedical devices on live human organs could benefit patient monitoring and wound treatment, which requires the 3D printer to adapt to the various deformations of the biological surface. We developed an in situ 3D printing system that estimates the motion and deformation of the target surface to adapt the toolpath in real time. With this printing system, a hydrogel-based sensor was printed on a porcine lung under respiration-induced deformation. The sensor was compliant to the tissue surface and provided continuous spatial mapping of deformation via electrical impedance tomography. This adaptive 3D printing approach may enhance robot-assisted medical treatments with additive manufacturing capabilities, enabling autonomous and direct printing of wearable electronics and biological materials on and inside the human body.National Institutes of Health, Grant 1DP2EB020537MedtronicThe graduate school of the University of Minnesota, 2019-20 Doctoral Dissertation FellowshipZhu, Zhijie; Park, Hyun Soo; McAlpine, Michael C. (2020). Supporting data for "3D Printed Deformable Sensors". Retrieved from the University Digital Conservancy, https://doi.org/10.13020/vqfp-vq57
Pholcus beijingensis Zhu & Song 1999
No full textPholcus beijingensis Zhu & Song, 1999 (Fig. 2) Pholcus beijingensis Zhu & Song, in Song, Zhu & Chen 1999: 52, f. 22Z, A'–C', 23A–C. Song, Zhu & Chen 2001: 73, f. 30A–H. Diagnosis. Among its near Pholcus relatives referred above (see the remark of P. alloctospilus), this species is very similar to P. clavimaculatus and P. triangulatus in the shapes of the palpal bulb and epigynum, all without appendices of the palpal bulb (Fig. 2G) and with a knob-shaped epigynal apophysis (Fig. 2C). It can be distinguished from these two species by the triangular uncus, the relatively simple tip of the procursus (Fig. 2H) and by the longer ventral apophysis of the trochanter (Figs. 2F and 2G), from P. triangulatus also by the pair of proximocentral cheliceral apophyses. Redescription. Male (holotype), total length 5.4: cephalothorax 1.5 long, 1.8 wide; abdomen 3.9 long, 1.4 wide. Leg I: 38.3 (9.7+0.7+9.8+15.6+2.5), tibia II: missing, tibia III: missing, tibia IV: 5.9; Tibia I L/D: 63. Carapace short, broad and almost circular, ochre, with brown marks broadly connecting to ocular area. Cephalic region raised, with two slender brown central marks, ocular area dark yellow. Clypeus 0.48, unmodified, slightly ochre, without marks. Distance AME–AME 0.05. Diameter AME 0.09, ALE 0.15, PME 0.14, PLE 0.14. Chelicerae as in Fig. 2E, with pair of black apophyses distally and pair of unsclerotized thumb-shaped apophyses proximolaterally. Labium and endites light yellow. Sternum ochre, with some irregular yellow marks. Femora, patellae and tibiae ochre, with dark rings, metatarsi and tarsi brown. Abdomen cylindrical, pale ochre, dorsum with numerous brown spots. Venter pale brown. Palps as in Figs. 2G and 2H, bulb with triangular uncus, without appendix; tip of procursus simple and broad; trochanter with long ventral apophysis and short retrolateral apophysis. Variation. Total body length 5.0–5.4. Tibia I in four other males: 10.4, 10.8, 9.9, 10.0. Female: in general very similar to male. Total length 4.2–4.7. One paratype total length 4.6: cephalothorax 1.3 long, 1.4 wide; abdomen 3.3 long, 1.8 wide. Tibia I in four females: 8.0, 6.8, 7.3, 6.8. Prosoma shape as in Fig 2A. Distance AME–AME 0.05. Abdomen cylindrical, pale ochre, dorsum with numerous brown patterns as in Fig. 2B. Epigynum roughly rectangular as in Fig. 2C, with a small T-shaped apophysis on the top. Dorsal view as in Fig. 2D, with a trapeziform sclerotized arch anteriorly and a pair of small oval pore plates. Distribution. Known from type locality and two neighboring localities in Yi County and Zhuolu County, Hebei Province, China. Material examined. CHINA: Beijing: May 30, 1980, leg. M. S. Zhu, male holotype, 4♀ paratypes (MHBU). Hebei: Zhuolu County, Yangjiaping Village, July 4, 2004, leg. F. Zhang, 2♀, 4♂ (MHBU); Yi County, Mt. Langya, June 12, 1999, leg. F. Zhang, 3♀ assigned tentatively (MHBU).Published as part of Zhang, Feng & Zhu, Ming-Sheng, 2009, A review of the genus Pholcus (Araneae: Pholcidae) from China, pp. 1-114 in Zootaxa 2037 (1) on pages 13-15, DOI: 10.11646/zootaxa.2235.1.2, http://zenodo.org/record/531760
Direct measurements of electrostatic potentials at grain boundaries: mechanism for current improvement in high-T-c superconductors
No full textGrain boundaries (GBs) in high-temperature superconductors represent the major factor limiting high current applications. Via magneto-optical imaging and direct transport measurements, we observed an increase of the intergranular J(c) in 4degrees and 8degrees [001] low-angle grain boundaries via substitution of Y by Ca in YBa2Cu3O7-x by up to 100%. Since Ca substitution leads to hole overdoping, these results suggest that charge depletion and band bending may be responsible for the suppression of superconductivity in GBs. By using electron holography, we directly observe ail electrostatic potential at the dislocation cores. The radius as well as the value of the potential are reduced in Ca-doped grain boundaries, directly reflecting the improved transport properties. (C) 2004 Elsevier B.V. All rights reserved
Caracladus montanus Sha & Zhu 1994
No full text<i>Caracladus montanus</i> Sha & Zhu, 1994 <p> <i>Caracladus montanus</i> Sha & Zhu, 1994: 172, figs 1–7; Song <i>et al.</i> 1999: 160, figs 88M–O.</p> <p> <b>Type material.</b> <b>HOLOTYPE: China:</b> <i>Jilin:</i> Changbai mountain [42°00' N, 128°01' E], 1♂ 1979-1990 (Sha & Zhu 1994). <b>PARATYPES: China:</b> <i>Jilin:</i> Changbai mountain, Baiyunfeng (“white cloud peak”) [42°00' N, 128°01' E], 1♂ 19.vi.1979, leg. Y. Zhang and C. Wang (Sha & Zhu 1994); Changbai mountain [42°00' N, 128°01' E], 1♂ 11.viii.1985, leg. C. Zhu (Sha & Zhu 1994); Changbai mountain, Xidapo (“big western slope”) [42°00' N, 128°01' E], 6♂ 9♀ 31.vii.1990, leg. Y. Sha (Sha & Zhu 1994); Changbai mountain, Xiaotianchi (“small heaven lake”) [42°05'48'' N, 128°03'50'' E], 3♂ 5♀ 04.viii.1990, leg. Y. Sha (Sha & Zhu 1994). The type material (mentioned above) is stored in the Department of Biology, Norman Bethune University of Medical Sciences in Changchun, which is now a subunit of the Jilin University, China (Sha & Zhu 1994). The material was not available for observation since establishing contacts with Jilin University was not successful..</p> <p> <b> Diagnosis. <i>Males</i></b> : Similar to <i>C. tsurusakii</i> with differences in the shape of the male palpal tibia and the embolus (Sha & Zhu 1994). In lateral view, the cephalic lobe is broadest below the eye-field (Sha & Zhu 1994: Fig. 2), but is narrowed down in <i>C. tsurusakii</i> (Fig. 45). The prolateral tibialapophysis looks like a big tooth (Sha & Zhu 1994: Fig. 4) whereas it is a glabrous blunt apophysis in <i>C. tsurusakii</i> (Fig. 42).</p> <p> <i>Females</i>: The shape of the epigynum and the vulva are different to what is seen in other <i>Caracladus</i> species. E.g. the curled copulatory duct (Sha & Zhu 1994: Fig. 7).</p> <p> <b> Description. <i>Males</i></b> : Total length: 1.85–2.07 mm (Sha & Zhu 1994). Cephalic lobe: facing forward, hairy in front of the PME (Sha & Zhu 1994: Fig. 2); shaft rather thick with some hairs (Sha & Zhu 1994: Fig. 2); sulcus absent. Eyes: PME upmost on the cephalic lobe (Sha & Zhu 1994: Fig. 2). Chelicerae: promargin with five larger teeth; retromargin with five very small denticles; stridulatory striae present (Sha & Zhu 1994). Legs: tibia I–IV with one dorsal proximal macroseta (1-1-1-1); Tm I: 0.61 (Sha & Zhu 1994). Pedipalp: paracymbium simple hook (Sha & Zhu 1994: Fig. 3); retrolateral tibial apophysis small tooth; prolateral tibial apophysis long and broad (Sha & Zhu 1994: Figs 4, 5); protegulum present (Sha & Zhu 1994: Fig. 3).</p> <p> <i>Females</i>: General appearance similar to males but without a cephalic lobe (Sha & Zhu 1994). Total length: 2.07–2.72 mm (Sha & Zhu 1994). Eyes: anterior row slightly recurved (Sha & Zhu 1994). Chelicerae: stridulatory striae present (Sha & Zhu 1994). Epigyne: ventral plate hourglass-like, visible in ventral view (Sha & Zhu 1994: Fig. 6, see remarks). Vulva: receptacula globular; copulatory duct spiral (Sha & Zhu 1994: Fig. 7).</p> <p> <b>Distribution.</b> Only known from the type locality in Jilin, China (Song <i>et al.</i> 1999).</p> <p> <b>Habitat.</b> The coordinates in the original publication correspond to a spot at ca. 2000 m a.s.l.</p> <p> <b>Phenology.</b> All records in summer time between June and August.</p> <p> <b>Remarks.</b> No specimens were available for examination. The diagnosis and description of certain structures and the coding of characters for the phylogeny on species level followed the descriptions and figures given in Sha and Zhu (1994) of which some are redrawn in Song <i>et al.</i> (1999). Misinterpretations of the figures can therefore not be excluded. It is assumed, for example, that <i>C. montanus</i> has no sulcus because Sha and Zhu (1994) mention the close resemblance to <i>C. tsurusakii</i> without mentioning a sulcus in the original description. The conformation of the epigyne is unclear to the authors. It is assumed that the ventral hourglassshaped structure represents the dorsal plate.</p>Published as part of <i>Frick, Holger & Muff, Patrick, 2009, Revision of the genus Caracladus with the description of Caracladus zamoniensis spec. nov. (Araneae, Linyphiidae, Erigoninae), pp. 1-37 in Zootaxa 1982</i> on page 17, DOI: <a href="http://zenodo.org/record/185321">10.5281/zenodo.185321</a>
Zhu De with children
No full textColor poster. Translation: Comrade Zhu De with the children. c. 1980shttps://digitalcommons.whitworth.edu/chinese_art_posters/1080/thumbnail.jp
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