Effects of in-medium nucleon-nucleon cross section on collective flow and nuclear stopping in heavy-ion collisions in the Fermi-energy domain

With the newly updated version of the ultrarelativistic quantum molecular dynamics (UrQMD) model, a systematic investigation of the effects of in-medium nucleon-nucleon ($NN$) elastic cross section on the collective flow and the stopping observables in $^{197}\text{Au}+^{197}\text{Au}$ collisions at beam energies from 40 to 150 MeV/nucleon is performed. Simulations with the medium correction factor $\mathcal{F}=\sigma^{\text{in-medium}}_{NN}/\sigma^{\text{free}}_{NN}=0.2,~0.3,~0.5$, and the one obtained with the FU3FP1 parametrization which depends on both the density and the momentum are compared to the FOPI and INDRA experimental data. It is found that, to best fit the experimental data of the slope of the directed flow and the elliptic flow at mid-rapidity as well as the nuclear stopping, the correction factor $\mathcal{F}$=0.2 and 0.5 are required for reactions at beam energies of 40 and 150 MeV/nucleon, respectively. While calculations with the FU3FP1 parametrization can simultaneously reproduce these experimental data reasonably well. And, the observed increasing nuclear stopping with increasing beam energy in experimental data can also be reproduced by using the FU3FP1 parametrization, while the calculated stopping power in Au+Au collisions with beam energies from 40 to 150 MeV$/$nucleon almost keeps constant when take $\mathcal{F}$ equal to a fixed value.Comment: 7 pages, 6 figures, accepted by Phys. Rev.

Collective flows of light particles in the Au+Au collision at intermediate energies

The Skyrme potential energy density functional is introduced into the Ultrarelativistic Quantum Molecular Dynamics (UrQMD) model and the updated version is applied to studying the directed and elliptic flows of light particles (protons, neutrons, deuterons, tritons, $^3$He and $^4$He) in $^{197}$Au+$^{197}$Au collisions at beam energies 150, 250 and 400 MeV/nucleon. The results are compared with the recent FOPI experimental data. It is found that the yields and collective flows of light particles can be described quite well. The influence of the equation of state (EoS), medium-modified nucleon-nucleon elastic cross sections (NNECS) and cluster recognition criteria on the directed and elliptic flows is studied in detail. It is found that the flows of light particles are sensitive to the medium-modified NNECS, but not sensitive to the isospin dependent cluster recognition criteria. It seems difficult, however, even with the new data and calculations, to obtain a more accurate constraint on the nuclear incompressibility $K_0$ than the interval 200-260 MeV.Comment: 23 pages, 8 figures,revised version accepted for publication in Phys. Rev.

Influencing factors and stage characteristics of intelligent construction of rural tourism in Fujian

With the help of qualitative analysis software Nvivo11, this paper makes a rooted analysis on the field text data of six rural tourism spots in Fujian Province. It shows that the influencing factors of the intelligent construction of rural tourism mainly including human capital, performance expectation, effort expectation, social impact, market demand and capital conditions. In the initial construction stage of rural tourism, the influence of capital conditions and human capital is stronger; in its development and construction stage, the impact of performance expectation is the most critical, followed by effort expectation and capital conditions; In its relatively mature stage, performance expectation and effort expectation are the dominant factors, followed by social influence. To promote the intelligent construction of rural tourism, effective measures should be taken according to the key factors in different development stages. It should be guided by the actual needs of tourists, pay attention to the fit with the positioning of rural tourism destination and target market, and avoid being intelligent for the sake of intelligence

PSR J1926-0652: A Pulsar with Interesting Emission Properties Discovered at FAST

We describe PSR J1926-0652, a pulsar recently discovered with the Five-hundred-meter Aperture Spherical radio Telescope (FAST). Using sensitive single-pulse detections from FAST and long-term timing observations from the Parkes 64-m radio telescope, we probed phenomena on both long and short time scales. The FAST observations covered a wide frequency range from 270 to 800 MHz, enabling individual pulses to be studied in detail. The pulsar exhibits at least four profile components, short-term nulling lasting from 4 to 450 pulses, complex subpulse drifting behaviours and intermittency on scales of tens of minutes. While the average band spacing P3 is relatively constant across different bursts and components, significant variations in the separation of adjacent bands are seen, especially near the beginning and end of a burst. Band shapes and slopes are quite variable, especially for the trailing components and for the shorter bursts. We show that for each burst the last detectable pulse prior to emission ceasing has different properties compared to other pulses. These complexities pose challenges for the classic carousel-type models.Comment: 13pages with 12 figure

Protective effect of aprepitant against chemotherapy induced nausea and vomiting in postoperative chemotherapy for gastric cancer

Purpose: To investigate the clinical efficacy of aprepitant in the prevention of chemotherapy-induced nausea and vomiting (CINV) caused by schemotherapy after gastric cancer surgery, and associated factors, as well as adverse reactions to the drug. Methods: A total of 100 postoperative gastric cancer patients in the Affiliated Cancer Hospital of Nanjing Medical University from January 2017 to January 2019, were randomly divided into control group (50 patients given dexamethasone + parlour SiQiong), and treatment group (50 patients given his minions horse temple + dexamethasone + parlour SiQiong). Recording of nausea and vomiting, as well as adverse reaction of patients, were started after 7 days of chemotherapy in patients. Results: The total effective control of acute CINV in the control group was 82 %, while the total effective control of acute CINV in the study group was 94 %. Values of total effective control of DFS in the control and study groups were 70 and 86 %, respectively. The incidence of adverse reactions was similar in the two groups. There was a significant correlation between the anti-emetic effect of aprepitant and gastric surgery. Conclusion: After gastric cancer surgery, combined treatment with aprepitant, palonosetron and dexamethasone prevents CINV induced by moderate emetogenic chemotherapy with orisaplatin. The combined treatment has good efficacy and can improve tolerance to, and compliance with chemotherap

Can Telling a Story Work? Understanding Answer Adoption Behavior in Online Q&A Communities from a Heuristic-Systematic Perspective

Online question-and-answer (Q&A) communities have been emerging as knowledge acquisition platforms. This study develops a heuristic-systematic model (HSM) to investigate the effects of systematic and heuristic cues on answer adoption behaviors, where the writing style in terms of narrative or non-narrative structure is proposed as a novel heuristic cue. It also firstly presents that recipient expertise will moderate the impact of systematic and heuristic cues differently. Preliminary experiments are conducted based on Q&A data collected from Zhihu.com. The results demonstrate that narrative answers significantly facilitate adoption behaviors, and viewer expertise negatively moderates this impact. The results also verify the positive impacts of other two selected systematic (answer completeness) and heuristic (answer helpfulness votes) cues, but the moderating effects of viewer expertise have not been well observed. This study contributes to enriching the interpretation mechanism of online Q&A adoption behaviors and provides practical insights for enhancing user engagement in online communities