21,087 research outputs found
Search for gamma (1S,2S) -˃ Z(c)(+)Z(c)((')-) and e(+)e(-) -˃ Z(c)(+)Z(c)((')-) at root s=10.52, 10.58, and 10.867 Gev
No full textThe first search for double charged charmoniumlike state production in gamma (IS) and gamma (2S) decays and in e(+) e(-) annihilation at root s = 10.52, 10.58, and 10.867 GcV is conducted using data collected with the Belle detector at the KEKB asymmetric energy electron-positron collider. No significant signals are observed in any of the studied modes, and the 90% credibility level upper limits on their product branching fractions in gamma(1S) and gamma(2S) decays [B(gamma(1S, 2S) -> Z(c)(+)Z(c)((')-)) x B(Z(c)(+) -> pi(+) + c (c) over bar ) (c (c) over bar = J / psi, chi(c1) (1P), psi(2S))] and the product of Born cross section and branching fraction for e(+)e(-) -> Z(c)(+)Z(c)((')-)) (sigma(e(+)e(-) -> Z(c)(+)Z(c)((')-)) x B(Z(c)(+) -> pi(+) + c (c) over bar )) at root s = 10.52, 10.58, and 10.867 GeV are determined. Here, Z(c) refers to the Z(c) (3900) and Z(c) (4200) observed in the pi J/psi final state, the Z(c1)(4050) and Z(c2)(4250) in the pi chi(c1)(1P) final state, and the Z(c)(4050) and Z(c)(4430) in the pi psi(2S) final state.We thank the KEKB group for the excellent operation of the accelerator; the KEK cryogenics group for the efficient operation of the solenoid; and the High Energy Accelerator Research Organisation (KEK) computer group, the National Institute of Informatics, and the Pacific Northwest National Laboratory Environmental Molecular Sciences Laboratory computing group for valuable computing and Science Information NETwork 5 network support. We acknowledge support from the Ministry of Education, Culture, Sports, Science, and Technology of Japan, the Japan Society for the Promotion of Science, and the Tau-Lepton Physics Research Center of Nagoya University; the Australian Research Council; Austrian Science Fund under Grant No. P 26794-N20; the National Natural Science Foundation of China under Contracts No. 11435013, No. 11475187, No. 11521505, No. 11575017, No. 11675166, No. 11705209, and No. 11761141009; Key Research Program of Frontier Sciences, Chinese Academy of Sciences, Grant No. QYZDJ-SSW-SLH011; the CAS Center for Excellence in Particle Physics; Fudan University Grants No. JIH5913023, No. IDH5913011/003, No. JIH5913024, and No. IDH5913011/002; the Ministry of Education, Youth and Sports of the Czech Republic under Contract No. LTT17020; the Carl Zeiss Foundation, the Deutsche Forschungsgemeinschaft, the Excellence Cluster Universe, and the VolkswagenStiftung; the Department of Science and Technology of India; the Istituto Nazionale di Fisica Nucleare of Italy; National Research Foundation of Korea Grants No. 2014R1A2A2A01005286, No. 2015R1A2A2A01003280, No. 2015H1A2A1033649, No. 2016R1D1A1B01010135, No. 2016K1A3A7A09005603, and No. 2016R1D1A1B02012900; Radiation Science Research Institute, Foreign Large-size Research Facility Application Supporting project, and the Global Science Experimental Data Hub Center of the Korea Institute of Science and Technology Information; the Polish Ministry of Science and Higher Education and the National Science Center; the Ministry of Education and Science of the Russian Federation and the Russian Foundation for Basic Research; the Slovenian Research Agency; Ikerbasque, Basque Foundation for Science, Basque Government (Grant No. IT956-16) and Ministry of Economy and Competitiveness (Juan de la Cierva), Spain; the Swiss National Science Foundation; the Ministry of Education and the Ministry of Science and Technology of Taiwan; and the United States Department of Energy and the National Science Foundation
Sustainable mega-seaports with integrated multi-energy systems: Life-cycle environmental and economic evaluation
No full textPorts play a critical role in modern society by acting as crucial links between water and land transportation, and integrating transportation with energy systems. This integration results in a high demand for various types of energy uses, with polluting emissions produced by the diverse energy sources. Integrated renewable energy systems represent promising solutions to achieving high levels of energy supply while lowering carbon footprints. In this research, a framework is proposed for a port multi-energy system that encompasses solar energy, wind energy, a hydrogen system and a number of energy storage systems. The proposed framework is tailored for implementation at Ningbo Zhoushan Port, the largest port globally. Different system design schemes are compared based on the number and rated power of wind turbines. Then, a comprehensive life-cycle economic and environmental assessment of the system is conducted through simulation. The economic and environmental metrics such as LCOE, REF and CO2 emissions are considered. The outcomes demonstrate that the design scheme incorporating two wind turbines with high rated power outperforms others in both environmental and economic metrics. Over the life-cycle, the renewable energy fraction exceeds 72%, and the levelized cost of energy plummets to 0.46 yuan/kWh. The implementation of the proposed port integrated multi-energy system yields substantial environmental and economic benefits. Specifically, it allows for a reduction of 66.68% in CO2 emissions and a cost reduction of 70.94%. These outcomes highlight the potential that the proposed system holds for enhancing environmental sustainability and economic efficiency within the port context
Transition-metal-catalyzed Chelation-assisted C-H Functionalization of Aromatic Substrates
No full textIn the past decade, transition-metal-catalyzed C-H activations have been very popular in the research field of organometallic chemistry, and have been considered as efficient and convenient strategies to afford complex natural products, functional advanced materials, fluorescent compounds, and pharmaceutical compounds. In this account, we begin with a brief introduction to the development of transition-metal-catalyzed C-H activation, especially the development of transition-metal-catalyzed chelation-assisted C-H activation. Then, a more detailed discussion is directed towards our recent studies on the transition-metal-catalyzed chelation-assisted oxidative C-H/C-H functionalization of aromatic substrates bearing directing functional groups. Transition-metal-catalyzed chelation-assisted C-H activation provides atom- and step-economical approaches for the construction of functional compounds. In this account, a more detailed discussion is directed towards our recent studies of the transition-metal-catalyzed chelation-assisted C-H/C-H functionalization of aromatic substrates bearing directing functional groups
Search for ϒ ( 1 S , 2 S ) → Z c + Z c ( ′ ) − and e + e − → Z c + Z c ( ′ ) − at s = 10.52 , 10.58, and 10.867 GeV
No full text
Boron-mediated directed aromatic C–H hydroxylation
No full textTransition metal-catalysed C–H hydroxylation is one of the most notable advances in synthetic chemistry during the past few decades and it has been widely employed in the preparation of alcohols and phenols. The site-selective hydroxylation of aromatic C–H bonds under mild conditions, especially in the context of substituted (hetero)arenes with diverse functional groups, remains a challenge. Here, we report a general and mild chelation-assisted C–H hydroxylation of (hetero)arenes mediated by boron species without the use of any transition metals. Diverse (hetero)arenes bearing amide directing groups can be utilized for ortho C–H hydroxylation under mild reaction conditions and with broad functional group compatibility. Additionally, this transition metal-free strategy can be extended to synthesize C7 and C4-hydroxylated indoles. By utilizing the present method, the formal synthesis of several phenol intermediates to bioactive molecules is demonstrated
Inclusive W and Z production in the forward region at √s=7TeV
No full textMeasurements of inclusive W and Z boson production cross-sections in pp collisions at s√=7TeV using final states containing muons are presented. The data sample corresponds to an integrated luminosity of 37 pb−1 collected with the LHCb detector. The W and Z bosons are reconstructed from muons with a transverse momentum above 20 GeV/c and pseudorapidity between 2.0 and 4.5, and, in the case of the Z cross-section, a dimuon invariant mass between 60 and 120 GeV/c2. The cross-sections are measured to be 831 ± 9 ± 27 ± 29pb for W +, 656 ± 8 ± 19 ± 23 for W − and 76.7 ± 1.7 ± 3.3 ± 2.7pb for Z, where the first uncertainty is statistical, the second is systematic and the third is due to the luminosity. Differential cross-sections, W and Z cross-section ratios and the lepton charge asymmetry are also measured in the same kinematic region. The ratios are determined to be σW+→μ+ν/σW−→μ−ν−=1.27±0.02±0.01 and (σW+→μ+ν+σW−→μ−ν−)/σZ→μμ=19.4±0.5±0.9 . The results are in general agreement with theoretical predictions, performed at next-to-next-to-leading order in QCD using recently calculated parton distribution functions
Amynthas yuanjiangensis Sun & Jiang & Wu & Yuan & Qiu 2021, sp. nov.
No full textAmynthas yuanjiangensis Sun & Qiu, sp. nov. (Fig. 4) Type material. Holotype: One clitellate specimen (C-YN201102-01), China, Yunnan Province, Yuanjiang National Nature Reserve (23°39ʹ54ʺN, 101°46ʹ29ʺE), 2096 m asl, by the side of a ditch, under chestnut tree, yellow cinnamon soil; Jul. 16, 2011; J. B. Jiang, J. Sun, X. D. Lei, and H. W. Feng coll. Paratypes: A total of 55 specimens, as follows: One clitellate (C-YN201703-01), China, Yunnan Province, Yulong Snow Mountain Provincial Nature Reserve (27°12ʹ19.6ʺN, 100°16ʹ47.7ʺE), 1451 m asl; Aug. 2, 2017; J. B. Jiang, Y. Dong, Q. Zhao, and Z. Yuan coll. Nine clitellates (C-YN201713-06), China, Yunnan Province, Wuliangshan Nature Reserve (24°46ʹ22.9ʺN, 100°31ʹ12.4ʺE), 2158 m asl; Aug. 5, 2017; J. B. Jiang, Y. Dong, Q. Zhao, and Z. Yuan coll. Nine clitellates (C-YN201719-01), China, Yunnan Province, Dali City, Cangshan National Nature Reserve (25°46ʹ55.1ʺN, 100°05ʹ27.4ʺE), 2364 m asl; Aug. 6, 2017; J. B. Jiang, Y. Dong, Q. Zhao, and Z. Yuan coll. Four clitellates (C-YN201722-01), China, Yunnan Province, Dali City, Yunlong Tianchi National Nature Reserve (25°51ʹ42.1ʺN, 99°17ʹ00.7ʺE), 2621 m asl; Aug. 7, 2017; J. B. Jiang, Y. Dong, Q. Zhao, and Z. Yuan coll. Two clitellates (C-YN201735-08), China, Yunnan Province, Dehong Dai and Jingpo Autonomous Prefecture, Tongbiguan Provincial Nature Reserve (24°08ʹ56.3ʺN, 98°01ʹ31.0ʺE), 957 m asl; Aug. 11, 2017; J. B. Jiang, Y. Dong, Q. Zhao, and Z. Yuan coll. Two clitellates (C-YN201749-01), China, Yunnan Province, Yongdedaxueshan Nature Reserve (25°09ʹ03.1ʺN, 99°42ʹ31.4ʺE), 2122 m asl, 14 Aug. 2017; J. B. Jiang, Y. Dong, Q. Zhao, and Z. Yuan coll. One clitellate (C-YN201756-04), China, Yunnan Province, Lincang City, Nangunhe National Nature Reserve (23°38ʹ58.3ʺN, 99°20ʹ32.9ʺE), 1429 m asl; Aug. 16, 2017; J. B. Jiang, Y. Dong, Q. Zhao, and Z. Yuan coll. Two clitellates (C-YN201762-05), China, Yunnan Province, Lincang City, Nangunhe National Nature Reserve (23°18ʹ54.9ʺN, 99°13ʹ14.4ʺE), 2129 m asl; Aug. 17, 2017; J. B. Jiang, Y. Dong, Q. Zhao, and Z. Yuan coll. Nine clitellates and four aclitellates (C-YN201627-02), China, Yunnan Province, Pu’er City, Jingdong Yi Autonomous County (24°16ʹ09.5ʺ N, 100°45ʹ37.3ʺ E), 1860 m asl, in black sandy soil; Jul. 30, 2016; X. Gao, Y. F. Lu, J. Z. Jiang, J. Long coll. Two clitellates and three aclitellates (C-YN201703-01), China, Yunnan Province, Lijiang City, Yulong Snow Mountain Provincial Nature Reserve (27°12ʹ07.2ʺN, 100°16ʹ51.9ʺE), 3140 m asl, in yellow soil; Aug. 2, 2017; Z. Yuan, J. B. Jiang, Y. Dong, Q. Zhao coll. Four clitellates (C-YN201722-01), China, Yunnan Province, Dali City, Yunlong Tianchi National Nature Reserve (25°51ʹ30.7ʺN, 99°17ʹ03.7ʺE), 2621 m asl, in brown soil; Aug. 7, 2017; Z. Yuan, J. B. Jiang, Y. Dong, Q. Zhao coll. Six aclitellates (C-YN201756-04), China, Yunnan Province, Lincang City, Nangunhe National Nature Reserve (23°38ʹ49.0ʺN, 99°20ʹ36.6ʺE), 1429 m asl, in yellow cinnamon soil; Aug. 16, 2017; Z. Yuan, J. B. Jiang, Y. Dong, Q. Zhao coll. Two clitellates (C-YN201735-08), China, Yunnan Province, Dehong Dai and Jingpo Autonomous Prefecture, Tongbiguan Provincial Nature Reserve (24°08ʹ46.1ʺN, 98°01ʹ32.3ʺE), 957 m asl, in brown soil; Aug. 11, 2017; Z. Yuan, J. B. Jiang, Y. Dong, Q. Zhao coll. Two clitellates (C-YN201762-05), China, Yunnan Province, Lincang City, Nangunhe National Nature Reserve (23°18ʹ45.2ʺN, 99°13ʹ17.4ʺE), 2129 m asl, in brown soil; Aug. 17, 2017; Z. Yuan, J. B. Jiang, Y. Dong, Q. Zhao coll. The habitats of the paratypes were not recorded in detail. Etymology. The name yuanjiangensis is derived from the collection site (Yuanjiang National Nature Reserve) of the holotype. In Chinese, Amynthas yuanjiangensis is Kmũ Ḃḋ. Diagnosis. Medium-sized; four pairs of spermathecal pores in 5/6–8/9; each male pore on the top of a large raised pulvinate pad; no genital papillae in the spermathecal pore and male pore regions; prostate gland partially vestigial in 1/2 XVII–1/2 XIX, or developed; spermathecal diverticulum about ¾ as long as the main spermathecal axis, distal U dilated into a rod-shaped seminal chamber. Description. External characters: Preserved specimens yellowish-brown on dorsum, lacking pigment on ventrum. Mid-dorsal line pigmented. Dimensions 80–135 mm by 3.0–5.0 mm at clitellum; segments 82–110. Secondary annulations present in VI–XIII. Prostomium ¾ epilobous. First dorsal pore in 11/12. Clitellum annular, in XIV–XVI, gray-brown, smooth, swollen, no setae on the ventral side; dorsal pores absent but with vestiges on clitellum. Setae uniformly distributed, 22–30 at III, 30–36 at V, 32–36 at VIII, 38–48 at XX, 46–62 at XXV; 7–9/VII, 7–14/VIII between spermathecal pores, 7–12 between male pores; setal formula AA=1.0–1.2AB, ZZ=1.2–1.3ZY. Spermathecal pores four pairs in 5/6–8/9 (Fig. 4a, sp.p), ventrally separated by slightly more than 0.33 of circumference. Male pores in XVIII, ventrally separated by 0.25 of circumference, each on top of a large raised pulvinate pad, surrounded by two skin folds medially and one rhombus-shaped skin fold laterally in the holotype (Fig. 4a, mp), but no skin fold in paratypes. No genital papillae in male pore region. Female pore single, mid-ventral in XIV, elliptical. Internal characters: Septa 8/9–9/10 absent, 5/6–7/8 thickened and muscular, 10/11–14/15 thicker than those following. Dorsal blood vessel single, continuous onto pharynx; esophageal hearts 4 pairs in X–XIII, all developed. Gizzard bucket-like, in VIII–X; intestinal swelling in XV. Intestinal caeca between simple and complex, originating in XXVII and extending forward to 1/2XXIII, horn-shaped sacs; tiny incisions deeper on dorsal margin than on ventral margin in holotype (Fig. 4b); tiny incisions only on dorsal margin in paratypes C-YN201703-01, CYN201703 -01, C-YN201719-01, and C-YN201735-08. Male organs: testis sacs in X and XI; oval, developed, two lobes connected ventromedially in the first pair and separated ventromedially in the second pair; two pairs of seminal vesicles in XI and XII, first pair separated ventromedially, second pair connected with a slim tube; in holotype, left prostate gland located in 1/2 XVII–1/2 XIX and degenerated into a small and compact lobe, right prostate gland pachytic and developed (Fig. 4c), its duct in XVIII, U-shaped, stout ventrally; prostate glands vestigial in paratypes C-YN201703-01, C-YN201719-0, and C-YN201735-08, but developed in paratype C-YN201713-06; no visible accessory glands on XVIII. Spermathecae paired in VI–IX, about 2.7 mm long; spermathecal ampulla heart-shaped, 2.1 mm long; in holotype, diverticulum about 3/4 as long as the main spermathecal axis, distal 2/5 dilated into a rodshaped seminal chamber; in paratypes C-YN201703-01, C-YN201713-06, C-YN201722-01, and C-YN201735-08, diverticulum about 1/2 as long as the main spermathecal axis, distal 1/2–1/3 dilated into rod-shaped seminal chamber; in paratype C-YN201719-01, diverticulum about 2/5 as long as the main spermathecal axis, distal 1/3 dilated into rod-shaped seminal chamber; no nephridia on spermathecal ducts (Fig. 4d). Variation. The prostate glands are either degenerated or developed. DNA barcodes. GenBank accession numbers KF205466 (C-YN201102-01, holotype), MH 845539 (CYN201703 -01, paratype), MH 845531 (C-YN201713-06, paratype), MH 845522 (C-YN201719-01, paratype), MH 845514 (C-YN201722-01, paratype), MH 845487 (C-YN201735-08, paratype), MH 845470 (C-YN201749- 01, paratype), MH 845460 (C-YN201756-04, paratype), MH 845451 (C-YN201762-05, paratype), MH 837679 (C-YN201627-02, paratype), MH 845539 (C-YN201703-01, paratype), MH 845514 (C-YN201722-01, paratype), MH 845460 (C-YN201756-04, paratype), MH 845487 (C-YN201735-08, paratype), MH 845451 (C-YN201762-05, paratype). Remarks. A. yuanjiangensis sp. nov. keys to the Amynthas corticis -group (Sims & Easton, 1972), characterized by four spermathecal pores located intersegmentally in 5/6–8/9 and by holandry. By now, there are 109 species belonging into A. corticis -group totally (Nguyen et al. 2020a). The combined characters of medium-sized body, male pore on the top of a large raised pulvinate pad, no genital papillae in the spermathecal pore and male pore regions, intestinal caeca between simple and complex, prostate gland partially vestigial or developed, and rod-shaped spermathecal seminal chamber make this new species different from the species reported from China in A. corticis -group. This new species is similar to Amynthas fornicates (Gates, 1935) in medium-sized body, no genital papillae in the male pore region, and the arrangement of spermathecal pores. However, in A. yuanjiangensis sp. nov., the intestinal caeca are between simple and complex, the prostate glands are partially degenerated, and the spermathecal diverticulum shorter than the main spermathecal axis; however, in A. fornicates, the intestinal caeca are simple, the prostate glands are developed, and the spermathecal diverticulum is longer than the main spermathecal axis. A. yuanjiangensis sp. nov. is resemble Amynthas homochaetus (Chen, 1938) in the large raised pulvinate pad of male pore area, no genital papillae on spermathecal pore region and male pore region especially. But A. yuanjiangensis sp. nov. is clearly distinguished from A. homochaetus by the following characters: 1) the intestinal caeca in A. homochaetus are simple, but in this new species, they are between simple and complex; 2) the prostate glands in A. homochaetus are well developed, but in the new species, they are partially degenerated; 3) the seminal chambers in A. homochaetus are ovoid, but those in the new species are rod-shaped. Amynthas disperses Sun & Qiu, 2018 and A. yuanjiangensis sp. nov. have both been collected in several localities in South China, and share some characters (e.g. megium-sized body, the area of male pore porophore is bigger, partially vestigial prostate gland, and band- or rod-shaped seminal chamber), but they are different from each other in the following ways: 1) the first dorsal pore is located at 10/11 or 11/12 on A. disperses, but always at 11/ 12 in the new species; 2) small genital papillae are always present in the spermathecal pore and male pore region in A. disperses, but there are no genital papillae in the new species; 3) the intestinal caeca in A. disperses are simple, but those in this new species are between simple and complex; 4) the spermathecal diverticulum is about as long as the main spermathecal axis in A. disperses, but shorter than the main spermathecal axis in the new species.Published as part of Sun, Jing, Jiang, Ji-Bao, Wu, Juzhen, Yuan, Zhu & Qiu, Jiang-Ping, 2021, Three new widely distributed and polymorphic species of Amynthas earthworms (Oligochaeta, Clitellata, Megascolecidae) from South China, pp. 457-474 in Zootaxa 4938 (4) on pages 464-467, DOI: 10.11646/zootaxa.4938.4.5, http://zenodo.org/record/457494
La conversazione in poesia nella narrativa chuanqi delle dinastie Yuan e Ming: analisi preliminare della novella Jiao Hong ji e di due racconti di epoca Ming
No full textIl saggio presenta un'analisi preliminare delle dinamiche della conversazione in poesia nella costruzione della coppia amorosa nella novellistica chuanqi dei periodi Yuan e Ming. Lo studio esamina la funzione narrativa degli scambi poetici nella novella Jiao Hong ji (La storia di Jiaoniang e Feihong), e ne considera l'influenza sulle novelle di epoca Ming "Jia Yunhua huanhun ji" e "Zhongqing liji
Yuan Real Exchange Rate Undervaluation, 1997-2006. How Much, How Often? Not Much, Not Often
No full textYuan real effective exchange rate misalignment is esitimated in a behavioral equilibrium exchange rate (BEER) model for the period 1997 to third quarter 2007. Using the Beveridge-Nelson decomposition a vector error correction model (VECM) of the exchange rate as a function of macroeconomic fundamentals, including government expenditures, economic openness, the balance of trade surplus, and net foreign assets, is estimated. We find that the Chinese Yuan has been fluctuating moderately around its long run equilibrium value with undervaluation up to 4% and overvaluation up to 6% at various points in time since 1997. This result is consistent with findings of many of the most recent studies employing alternative econometric methodologies to determine the equilibrium exchange rate. While the Yuan real effective exchange rate has deviated from equilibrium, and it is sticky, taking over five years to correct 50% of the short run misalignment, it does not appear to have been consistently undervalued as has been widely argued.Chinese Yuan, Exchange Rate, Misalignment, BEER, Behavioral, Cointegration, ARIMA, VECM, FGLS.
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