48,150 research outputs found
Nonballistic heat conduction in an integrable random-exchange Ising chain studied with quantum master equations
No full text10.1103/PhysRevB.77.172411Physical Review B - Condensed Matter and Materials Physics7717-PRBM
Measurement of the differential and double-differential Drell-Yan cross sections in proton-proton collisions at root s=7 TeV
No full textMeasurements of the differential and double-differential Drell-Yan cross sections are presented using an integrated luminosity of 4.5 (4.8) fb−1 in the dimuon (dielectron) channel of proton-proton collision data recorded with the CMS detector at the LHC at s√ = 7 TeV. The measured inclusive cross section in the Z-peak region (60–120 GeV) is σ(ℓℓ) = 986.4 ± 0.6 (stat.) ± 5.9 (exp. syst.) ± 21.7 (th. syst.) ± 21.7 (lum.) pb for the combination of the dimuon and dielectron channels. Differential cross sections dσ/dm for the dimuon, dielectron, and combined channels are measured in the mass range 15 to 1500 GeV and corrected to the full phase space. Results are also presented for the measurement of the double-differential cross section d2σ/dm d|y| in the dimuon channel over the mass range 20 to 1500 GeV and absolute dimuon rapidity from 0 to 2.4. These measurements are compared to the predictions of perturbative QCD calculations at next-to-leading and next-to-next-to-leading orders using various sets of parton distribution functions
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
Betrayal or innovation?: European influence on the literary creation of the contemporary chinese writer Yan Lianke
No full textLa traducción de textos, muchos de ellos procedentes de Europa, ha tenido un
protagonismo especial en algunos momentos de la historia de China. Uno de ellos
se produce en la década de los 80 del siglo XX –y se extiende aún hasta nuestros
días– con la publicación de innumerables libros extranjeros, influenciando a su
vez la escritura literaria china. Yan Lianke (1958- ) es un ejemplo paradigmático
de un autor chino que admite públicamente el impacto de la literatura extranjera
en sus novelas. Ahora bien, ¿hasta qué punto es esa influencia cierta? Mediante el
análisis de algunas obras de Yan Lianke, tanto de narrativa como de teoría literaria,
se tratará de valorar el alcance de dicha influencia y los rasgos característicos de
la mismaThe encounter between Europe and China has historically produced
several watershed moments marked by tides of translation. Many of the texts
translated from European languages have played a special role in China’s
literary development. The wave of publication of a vast array of foreign
books that started in the 1980s and in a sense is ongoing in the present day
has had a profound impact on the Chinese writing and literary culture. Yan
Lianke (b. 1958) is a paradigmatic example of a Chinese author who publicly
acknowledges the influence of foreign literature on his novels. By means of an
analysis of the inflections of European literary motives in Yan Lianke’s novels
and theoretical works, we can begin to take stock of the scope and modes of
this influenceEste trabajo forma parte del proyecto EAU-TBC (HERA.15.066), financiado por el Ministerio de Economía, Industria y Competitividad y la Unión Europea a través del programa HERA JRP-U
On Nieh-Yan transport
No full text[EN] We study nondissipative transport induced by the Nieh-Yan anomaly. After computing the torsional terms in the equilibrium partition function using transgression, we find the constitutive relations for the covariant axial-vector, heat, stress, and spin currents. A number of new transport effects are found, driven by background torsion and the spin chemical potential. Torsional constitutive relations in two-dimensional systems are also analyzed.This work has been supported by Spanish Science Ministry grants PGC2018-094626-B-C21 (MCIU/AEI/FEDER, EU) and PGC2018-094626-B-C22 (MCIU/AEI/FEDER, EU), as well as by Basque Government grant IT979-16
Corrigendum: Liu W-B, Wang C-Y, Tang Y-N, Wang Y, Pei W-X, Yan C-C (2024) Six new species of Cryptochironomus Kieffer (Diptera, Chironomidae) from the Nearctic region. ZooKeys 1200: 275–302. doi: 10.3897/zookeys.1200.119225
No full textCorrigendum: Liu W-B, Wang C-Y, Tang Y-N, Wang Y, Pei W-X, Yan C-C (2024) Six new species of Cryptochironomus Kieffer (Diptera, Chironomidae) from the Nearctic region. ZooKeys 1200: 275–302. https://doi.org/10.3897/ zookeys.1200.11922
Branching fraction and CP asymmetry of the decays B+→K0Sπ+ and B+→K0SK+
No full textAn analysis of B+ → K0
Sπ+ and B+ → K0
S K+ decays is performed with the LHCb experiment. The pp
collision data used correspond to integrated luminosities of 1 fb−1 and 2 fb−1 collected at centre-ofmass
energies of
√
s = 7 TeV and
√
s = 8 TeV, respectively. The ratio of branching fractions and the
direct CP asymmetries are measured to be B(B+ → K0
S K+
)/B(B+ → K0
Sπ+
) = 0.064 ± 0.009 (stat.) ±
0.004 (syst.), ACP(B+ → K0
Sπ+
) = −0.022 ± 0.025 (stat.) ± 0.010 (syst.) and ACP(B+ → K0
S K+
) =
−0.21 ± 0.14 (stat.) ± 0.01 (syst.). The data sample taken at
√
s = 7 TeV is used to search for
B+
c
→ K0
S K+ decays and results in the upper limit ( fc · B(B+
c
→ K0
S K+
))/( fu · B(B+ → K0
Sπ+
)) <
5.8 × 10−2 at 90% confidence level, where fc and fu denote the hadronisation fractions of a ¯b
quark
into a B+
c or a B+ meson, respectively
FIGURE 3 in Sphaeropteris guangxiensis Y. F. Gu & Y. H. Yan (Cyatheaceae), a new species of tree fern from Southern China
No full textFIGURE 3. Fiddleheads and sori on pinnule segments.—A & D. Sphaeropteris brunoniana.—B & E. S. guangxiensis.—C & F. S. hainanensis.Published as part of Gu, Yu-Feng, Jiang, Ri-Hong, Liu, Bao-Dong & Yan, Yue-Hong, 2021, Sphaeropteris guangxiensis Y. F. Gu & Y. H. Yan (Cyatheaceae), a new species of tree fern from Southern China, pp. 69-74 in Phytotaxa 518 (1) on page 72, DOI: 10.11646/phytotaxa.518.1.8, http://zenodo.org/record/544801
Correlates of chronic hepatitis B virus infection in the general adult population of China: systematic review and meta-analysis
No full textChronic infection with hepatitis B virus (HBV) is a significant public health issue in China. Understanding factors associated with chronic HBV is important to enable targeted screening and education and to improve early diagnosis and prevention of disease progression. This systematic review and meta-analysis aimed to identify and describe correlates of chronic HBV among Chinese adults. Searches were conducted in MEDLINE, EMBASE and grey literature up to 25 June 2020. Eligible papers included observational studies in adults of the general population in China that reported factors associated with chronic HBV, measured by Hepatitis B surface antigen (HBsAg). Meta-analysis was performed using fixed-effect models of HBsAg prevalence among factors, and of adjusted odds ratios (ORs) for chronic HBV associated with each factor. Overall 39 articles were included, covering 22 factors, including a range of sociodemographic, behavioural and medical factors. In meta-analysis of eligible studies, a range of factors were significantly associated with higher HBsAg prevalence, including middle age, male sex, being married, rural residence, lower education, smoking, having a HBsAg positive household contact, family history of HBV, history of surgery or blood transfusion. The adjusted ORs varied, from 1.11 (95% CI 1.05–1.18) for smoking to 5.13 (95% CI 4.99–5.26) for having a HBsAg positive household contact. In Chinese adults, a range of factors are associated with chronic HBV infection, which may help inform targeted screening in the general population
The state-of-the-art preparation, purification and biological activities of mannan oligosaccharides
No full textMannan oligosaccharides (MOSs), a class of functionally edible oligosaccharides, show a range of advantages given its abundant, sustainable, bioactive, and biocompatible properties. They have been widely applied into the fields of pharmaceutical, food and feed industries. To fully understand the progress of the preparation and biological activities of MOSs in these fields in decades, we summarized and compared various techniques for the preparation of MOSs from yeast cell walls and different plants. As well, diverse techniques for the separation and purification of MOSs have been reviewed in details. More importantly, their biological activities, such as effectively improve the intestinal microbial environment, improve the body's immunity, reduce blood glucose and blood lipids, and improve animal growth performance, are clearly discussed in this review. The applications of MOSs in the field of functional foods are also summarized. This review endeavors to function as a primer for individuals with a scholarly interest in prebiotic research, offering a foundational perspective for delving into the intricate domain of bio-based molecular taxonomy
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