＜正＞Photocatalysis is a sunrise technology with great potential for hydrogen production [1，2]， carbon dioxide reduction [3]， and so on. However， a single-component photocatalyst often exhibits severely limited activity due to rapid photogenerated carrier recombination and weak redox abilities.
＜正＞Huang Xiaobei is a university student in south China’s Guangxi Zhuang Autonomous Region. She first came into contact with bullet-screen （弹幕） comments when she was watching a Chinese movie. At that time, she couldn’t close the comments on the web page, so she was forced to watch them. However, after this experience, Huang Xiaobei considered this form of interaction to be very interesting. Like Huang Xiaobei, many college students find themselves interested in bullet-screen comments when watching videos.
＜正＞借贷有风险,监管要给力。花钱不量力,后悔又伤悲。难词探意At one point in June last year, Zeng Jinpeng was more than 10,000 yuan in debt to a smartphone app. The 23-year-old Shanghai resident pays for his online purchases with Huabei, a virtual credit card that’s part of Alibaba Group Holding Ltd.’s sprawling stable of e-commerce properties.
Huasipungo by Jorge Icaza is considered one of the primary texts of the Latin American social criticism novels because it denounces the exploitation of the Andean indigenous peoples of Ecuador. This judgement, however, ignores descriptions that show “Indians” as degraded, animal-like and lacking culture, especially when it is time to “devour” the “food” that is attributed to them: corn, low-quality potatoes and carrion. These textual ambiguities are in conflict with the social objectives of Huasipungo, since they prolong the vision of an inferior “Indian,” lacking rights and therefore, an object of exploitation and “natural” extermination on the part of the landowning oligarchy in the name of “progress” for the nation.
The top quark is the heaviest particle to date discovered, with a mass close to the electroweak symmetry breaking scale. It is expected that the top quark would be sensitive to the new physics at the TeV scale. One of the most important aspects of the top quark physics can be the investigation of the possible anomalous couplings. Here, we study the top quark flavor changing neutral current (FCNC) couplings via the extra gauge boson Z′ at the Large Hadron Collider (LHC) and the Compact Linear Collider (CLIC) energies. We calculate the total cross sections for the signal and the corresponding Standard Model (SM) background processes. For an FCNC mixing parameter x=0.2 and the sequential Z′ mass of 1 TeV, we find the single top quark FCNC production cross sections 0.38(1.76) fb at the LHC with 脰{spp}=7(14)\sqrt{s_{pp}}=7(14) TeV, respectively. For the resonance production of sequential Z′ boson and decays to single top quark at the Compact Linear Collider (CLIC) energies, including the initial state radiation and beamstrahlung effects, we find the cross section to be 27.96(0.91) fb at 脰{se+e-}=1(3)\sqrt{s_{e^{+}e^{-}}}=1(3) TeV, respectively. We make the analysis to investigate the parameter space (mixing-mass) through various Z′ models. It is shown that the results benefit from the flavor tagging.
J. G. Dueñas
N. Gutierrez
R. Martínez and F. Ochoa
We analyse the possibilities to detect a new Z ′ boson in di-electron events at Tevatron and LHC in the framework of the 331 model with right-handed neutrinos. We also study other fermions and Higgs events as final state at LHC. Using p[`(p)]p\bar{p} collision data collected by the CDF II detector at Fermilab Tevatron, we find that the 331 Z ′ boson is excluded with masses below 920 GeV. For an integrated luminosity of 100 fb−1 at LHC, and considering a central value MZ垄=1500M_{Z^{\prime}}=1500 GeV, we obtain the invariant-mass distribution in the process pp→Z ′→e + e −, where a huge peak, corresponding to 800 signal events/(20 GeV), is found above the SM background. The number of di-electron events vary from 50000 to 2400 in the mass range of MZ垄=800M_{Z^{\prime}}=800 –2000 GeV. We also obtain branching ratios and cross sections in other fermion and Higgs channels at LHC, where a heavy top quark T exhibits the biggest ratio with m T =300 GeV.
The M emission spectra of the heavy rare earth elements 67Ho, 68Er, 69Tm, 70Yb, and 71Lu were reinvestigated using wavelength dispersive spectrometry with a TAP crystal as the dispersing element. In order to resolve weak lines, which are near to the strong α and β lines/bands, the regions around these lines were additionally measured using the second order reflection. In this manner in total 54 M lines were observed of which only 19 are contained in Bearden’s compilation. A difference between the line positions of metals and oxides was observed only for the Mα line of 70Yb. This observation agrees with an earlier report of Fischer and Baun. The observed dependencies of the intensity ratios Mβ/Mα and Mζ/Mα on the atomic number Z reflect the increasing filling of the N7 subshell with increasing Z.
A reinvestigation was undertaken in order to obtain reliable data of the relative intensities of the L spectra for the elements 24 ≤ Z ≤ 33. A TAP crystal with a periodicity of 25.757 脜 was used as the dispersing element. With this crystal one is able to resolve the lines/bands Ll = L3M1, Lη = L2M1, Lα1,2 = L3M4,5, Lβ1 = L2M4, and Lβ3,4 = L1M2,3. Among the investigated elements 33As is the only one for which the energy of the lines Lα1,2 and Lβ1 is below the L3 absorption edge. For all the other elements the lines Ll, Lη, and Lα1,2 are below the L3 edge, whereas Lβ1 and Lβ3,4 are above this edge. This difference leads to effects of differential absorption, where the absorption is stronger for decreasing line energy. For the net peak height ratio β1/α we obtained results which are of the same order of magnitude as those given by White and Johnson (W&J) in their popular tables. But for l/α and β3,4/β1 our results show an atomic number dependence which is completely different from those given by W&J.
In this paper we propose a strategy for measuring the inclusive W boson production processes at LHC. This strategy exploits simultaneously the unique flexibility of the LHC collider in running variable beam particle species at variable beam energies, and the configuration flexibility of the LHC detectors. We propose their concrete settings for a precision measurement of the standard model parameters. These dedicated settings optimise the use of the Z boson and Drell–Yan-pair production processes as “the standard reference candles”. The presented strategy allows one to factorise and to directly measure those of the QCD effects that affect differently the W and Z production processes. It reduces to a level of O(10-4)\mathcal{O}(10^{-4}) the impact of uncertainties in the partonic distribution functions (PDFs) and in the transverse momentum of the quarks on the measurement precision. Last but not the least, it reduces by a factor of 10 the impact of systematic measurement errors, such as the energy scale and the measurement resolution, on the W boson production observables.
Creat membership
Sweep WeChat yards
