125,003 research outputs found
Ascopolyporus tibetensis F. M. Yu, Q. Zhao & T. Luangharn
No full text<i>Ascopolyporus tibetensis</i> F.M. Yu, Q. Zhao & T. Luangharn <p> <b>Host:</b> On the living stem of bamboo</p> <p> <b>Distribution:</b> China (Tibet)</p>Published as part of <i>Yu, Feng-Ming, Wei, De-Ping, Zhao, Qi, Tang, Song-Ming & Luangharn, Thatsanee, 2023, Ascopolyporus tibetensis (Cordycipitaceae, Hypocreales): a new species from Tibet, China, pp. 88-98 in Phytotaxa 592 (2)</i> on page 95, DOI: 10.11646/phytotaxa.592.2.2, <a href="http://zenodo.org/record/7840405">http://zenodo.org/record/7840405</a>
Styloperla starki Zhao, Huo & Du 2019
No full text<i>Styloperla starki</i> Zhao, Huo & Du, 2019 <p> <i>Styloperla starki</i>: Zhao <i>et al.</i>, 2019: 555.</p> <p> <b>Materials examined:</b> The specimens re-studied from Zhejiang and Jiangsu were recorded by Huo (2019), Zhao (2019), and Zhao <i>et al.</i> (2019).</p> <p> <b>Distribution:</b> Jiangsu and Zhejiang.</p> <p> <b>Remarks:</b> The number of ventral and subapical spines along the long process of the basal cercal segment varies between four and five (Figs. 7A–B); the apical spines are usually arranged side by side but may also be tandemed vertically (Figs. 7C–D); one apical and two of the subapical spines are occasionally aligned along the same plane (Fig. 8A–D).</p>Published as part of <i>Huo, Qing-Bo, Zhao, Meng-Yuan, Du, Yu-Zhou, Murányi, Dávid, Zhu, Bin-Qing & Yu, Lei, 2023, The intraspecific morphological variability of Styloperla Wu, 1935 (Plecoptera: Styloperlidae), pp. 125-137 in Zootaxa 5249 (1)</i> on page 129, DOI: 10.11646/zootaxa.5249.1.7, <a href="http://zenodo.org/record/7685409">http://zenodo.org/record/7685409</a>
Saturation impulses for dynamically loaded structures with finite-deflections
No full textThe concept of ''Saturation Impulse'' for rigid, perfectly plastic structures with finite-deflections subjected to dynamic loading was put forward by Zhao, Yu and Fang (1994a). This paper extends the concept of Saturation Impulse to the analysis of structures such as simply supported circular plates, simply supported and fully clamped square plates, and cylindrical shells subjected to rectangular pressure pulses in the medium load range. Both upper and lower bounds of nondimensional saturation impulses are presented
Xun zhao yu zhou can shu de ge xiang yi xing
No full textChan, King Pak Keven = 尋找宇宙參數的各向異性 / 陳景柏.Thesis Ph.D. Chinese University of Hong Kong 2015.Includes bibliographical references (leaves 104-107).Abstracts also in Chinese.Title from PDF title page (viewed on 29, September, 2016).Chan, King Pak Keven = Xun zhao yu zhou can shu de ge xiang yi xing / Chen Jingbo
Rates of Return to University Education: the Regression Discontinuity Design
No full textEstimating the rate of return to a university degree has always been difficult due to the problem of omitted variable biases. Benefiting from a special feature of the University Admission system in China, which has clear cutoffs for university entry, combined with a unique data set with information on individual National College Entrance Examination (NCEE) scores, we estimate the Local Average Treatment Effects (LATE) of university education based on a Regression Discontinuity design. To the best of our knowledge, this is the first study to use RD design to estimate the causal effect of a university education on earnings. Our results show that the rates of return to 4-year university education relative to 3-year college education are 40 and 60 per cent for the compliers in the male and female samples, respectively, which are much larger than the simple OLS estimations revealed in previous literature. Since in our sample a large proportion of individuals are compliers (45 per cent for males and 48 per cent for females), the LATEs estimated in this paper have a relatively general implication. In addition, we find that the LATEs are likely to be larger than ATEs, suggesting that the inference drawn from average treatment effects might understate the true effects of the university expansion program introduced in China in 1999 and thereafter.Rate of return to education, Regression Discontinuity Design, China
Ye xing zai xian : Taiwan bao yu dong wu yu yu wai bao yu xing dong /
No full textFu lu: bao yu huo ban (Taiwan yu wai bao yu xiang guan ji gou) deng 2 zhong.Zhong Ying dui zhao = 中英對
Rates of Return to University Education: The Regression Discontinuity Design
No full textEstimating the rate of return to a university degree has always been difficult due to the problem of omitted variable biases. Benefiting from a special feature of the University Admission system in China, which has clear cutoffs for university entry, combined with a unique data set with information on individual National College Entrance Examination (NCEE) scores, we estimate the Local Average Treatment Effects (LATE) of university education based on a Regression Discontinuity design. To the best of our knowledge, this is the first study to use RD design to estimate the causal effect of a university education on earnings. Our results show that the rates of return to 4-year university education relative to 3-year college education are 40 and 60 per cent for the compliers in the male and female samples, respectively, which are much larger than the simple OLS estimations revealed in previous literature. Since in our sample a large proportion of individuals are compliers (45 per cent for males and 48 per cent for females), the LATEs estimated in this paper have a relatively general implication. In addition, we find that the LATEs are likely to be larger than ATEs, suggesting that the inference drawn from average treatment effects might understate the true effects of the university expansion program introduced in China in 1999 and thereafter.rate of return to education, regression discontinuity design, China
High performance Monte Carlo computation for finance risk data analysis
No full textThis thesis was submitted for the degree of Doctor of Philosophy and awarded by Brunel University.Finance risk management has been playing an increasingly important role in the finance sector, to analyse finance data and to prevent any potential crisis. It has been widely recognised that Value at Risk (VaR) is an effective method for finance risk management and evaluation. This thesis conducts a comprehensive review on a number of VaR methods and discusses in depth their strengths and limitations. Among these VaR methods, Monte Carlo simulation and analysis has proven to be the most accurate VaR method in finance risk evaluation due to its strong modelling capabilities. However, one major challenge in Monte Carlo analysis is its high computing complexity of O(n²). To speed up the computation in Monte Carlo analysis, this thesis parallelises Monte Carlo using the MapReduce model, which has become a major software programming model in support of data intensive applications. MapReduce consists of two functions - Map and Reduce. The Map function segments a large data set into small data chunks and distribute these data chunks among a number of computers for processing in parallel with a Mapper processing a data chunk on a computing node. The Reduce function collects the results generated by these Map nodes (Mappers) and generates an output. The parallel Monte Carlo is evaluated initially in a small scale MapReduce experimental environment, and subsequently evaluated in a large scale simulation environment. Both experimental and simulation results show that the MapReduce based parallel Monte Carlo is greatly faster than the sequential Monte Carlo in computation, and the accuracy level is maintained as well. In data intensive applications, moving huge volumes of data among the computing nodes could incur high overhead in communication. To address this issue, this thesis further considers data locality in the MapReduce based parallel Monte Carlo, and evaluates the impacts of data locality on the performance in computation
Hiroshiinoueana inequivalva Fei & Zhao & Liu & Yu 2018, sp. nov.
No full textHiroshiinoueana inequivalva Fei & Yu, sp. nov. (Figs. 3, 5–8) Types. Holotype: ♂, China, Shaanxi Province, Langao, 32°22' N, 108°81' E, 877 m, 15 Aug 2016, leg. Weixing Feng & Wentao Shi, genitalia slide no. ZJX16346. Paratypes: 1 ♂, CHINA: Shaanxi Province: Langao, 32°23' N, 108°42' E, 1127 m, 29 Jul 2016, leg. Jingxia Zhao & Peng Liu; 1 ♀, Langao, 32°29' N, 108°87' E, 577 m, 18 Aug 2016, leg. Jingxia Zhao & Peng Liu; 1 ♂, Pingli, 32°03' N, 109°33' E, 772 m, 2 Aug 2016, leg. Jingxia Zhao & Peng Liu. Diagnosis. Hiroshiinoueana inequivalva differs from the two previously described species by the narrow and elongate dorso-basal spiny lobe of valva in the male genitalia, which is broad and rounded in the other two species. The new species also can be separated easily from H. gangweonensis by the bristle clusters of the valvae of different size and the cucullus with a rounded dorsal margin; in H. gangweonensis the bristle clusters of the valvae are identical on the right and left sides, and the cucullus is half-moon shaped and its dorsal margin is almost straight. Two additional characters of the male genitalia can be used to distinguish this new species from H. stellifera: the median portion of the gnathos is bilobed in H. inequivalva, whereas the gnathos is a transverse band with a pending process in H. stellifera; and the cucullus is rounded in this new species, whereas it is triangular in H. stellifera. Differences between this new species and H. wuzhishanica are provided above. Description. Adult (Fig. 3). Head: Vertex rough scaled, pale brown. Antenna pale brown, dusted with black scales. Labial palpus porrect, pale yellowish brown; median segment expanded ventrally, terminal segment pointed. Thorax: Yellowish brown with pale metallic spots. Hind tibia in male not enlarged. Forewing length 7.0– 7.5 mm; long triangular, costa slightly arched apically, apex blunt; costa with distal 1/4 white; costal strigulae dingy white to pale brown; upperside ground color pale brown with light-blue metallic spots throughout, markings dark brown suffused with pale ochreous, with edges ill-defined; basal and subbasal fascia occupying basal 1/4 of wing; median fascia broad and oblique, proximal edge extending from 2/5 length of costa to mid-dorsum, distal edge reaching tornus; postmedian fascia connected with preterminal and terminal fascia, somewhat crescent shaped, lower part reaching termen between M2 and CuA1; termen white between apex and M2; white scales scattered over area between median fascia and postmedian fascia, forming several small pale dots inside tornus, indistinct in some specimens; fringe dark brown; underside pale brown. Hindwing pale brown except costa white, fringe pale brown, anal fold absent; underside pale brown. Abdomen: Male genitalia (Fig. 5) with tegumen strongly sclerotized. Uncus and socius weakly sclerotized; uncus reduced; socius drooping, finger-like, with basal part broad, sparsely spined. Gnathos strongly sclerotized, with lateral part very narrow, median portion protruding to two large rounded petal-shaped lobes, naked. Valvae with basal parts strongly sclerotized and distal parts weakly sclerotized; asymmetrical, left valva larger; basal excavation distinct; cucullus with basal part expanding inward to a large rounded lobe bearing rows of spines, most spines directed towards phallus, diminishing in size backward; sacculi asymmetrical; left sacculus larger, with basal part expanded and densely spined, apical part forming a rounded prominence and bearing a thick cluster of long bristles, length of bristles about equal to sacculus; right sacculus smaller, basal part same as left sacculus, distal part small and not expanded, apical bristle cluster adjacent to spined basal part, slender, length about 3/5 times that of left sheaf; cucullus weakly sclerotized, broad, folded longitudinally, with sparse spines, rounded distally. Anellus well sclerotized, broadly surrounding phallus; phallus simple, narrow, without cornuti. Vinculum simple, narrow. Female genitalia (Fig. 6) with papillae anales elongate. Anterior and posterior apophyses slender, about equal in length. Sterigma (Fig. 7) strongly sclerotized, smooth, deeply invaginated to form a thick tube and expanded medially. Ductus bursae with posterior 1/3 surrounded by sterigma, posterior half sclerotized, and anterior portion membranous; slender, except expanded at middle. Corpus bursae ovoid, granulated; signum (Fig. 8) a large, rounded, scobinate patch with seven elongate teeth radiating from a small central circle and pointing outward. Molecular characterization. Partial mitochondrial COI gene sequence with GenBank accession number MG983837 for one female paratype, MG983838 for one male paratype. Etymology. The specific name is derived from the Latin prefix in -, equi - (= equal) and valva, referring to the asymmetrical valvae in the male genitalia.Published as part of Fei, Yao, Zhao, Jingxia, Liu, Kaili & Yu, Haili, 2018, First record of Hiroshiinoueana Kawabe, 1978 from China (Lepidoptera: Tortricidae: Olethreutinae), with descriptions of two new species, pp. 324-330 in Zootaxa 4429 (2) on pages 327-330, DOI: 10.11646/zootaxa.4429.2.7, http://zenodo.org/record/128403
A Chemistry and Material Perspective On Lithium Redox Flow Batteries Towards High-Density Electrical Energy Storage
No full textElectrical energy storage system such as secondary batteries is the principle power source for portable electronics, electric vehicles and stationary energy storage. As an emerging battery technology, Li-redox flow batteries inherit the advantageous features of modular design of conventional redox flow batteries and high voltage and energy efficiency of Li-ion batteries, showing great promise as efficient electrical energy storage system in transportation, commercial, and residential applications. The chemistry of lithium redox flow batteries with aqueous or non-aqueous electrolyte enables widened electrochemical potential window thus may provide much greater energy density and efficiency than conventional redox flow batteries based on proton chemistry. This Review summarizes the design rationale, fundamentals and characterization of Li-redox flow batteries from a chemistry and material perspective, with particular emphasis on the new chemistries and materials. The latest advances and associated challenges/opportunities are comprehensively discussed.Zhao, Yu, Yu Ding, Yutao Li, Lele Peng, Hye Ryung Byon, John B. Goodenough, and Guihua Yu. "A chemistry and material perspective on lithium redox flow batteries towards high-density electrical energy storage." Chemical Society Reviews 44, no. 22 (Nov., 2015): 7968-7996.Materials Science and Engineerin
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