Pion condensation in a soft-wall AdS/QCD model

Finite isospin chemical potential $\mu_I$ and temperature $T$ have been introduced in the framework of soft-wall AdS/QCD model. By self-consistently solve the equation of motion, we obtain the phase boundary of pion condensation phase, across which the system undergoes a phase transition between pion condensation phase and normal phase. Comparing the free energy of solutions with and without pion condensation, we find that the phase transition is of first order type both at large $\mu_I$ and small $\mu_I$. Qualitatively, the behavior at large $\mu_I$ is in agreement with the lattice simulation in Phys.Rev.D66(2002)034505, while the behavior at small $\mu_I$ is different from lattice simulations and previous studies in hard wall AdS/QCD model. This indicates that a full back-reaction model including the interaction of gluo-dynamics and chiral dynamics might be necessary to describe the small $\mu_I$ pion condensation phase. This study could provide certain clues to build a more realistic holographic model.Comment: Regular article, 21 page

Short Video Contents Production Based on Stickiness: Taking XinJing News “Our Video” as An Example

In the era of mobile connectivity, news production emphasizes the priority of mobile terminals. Video news becomes the mainstream of mobile news products. With the rapid development of short video market, media organizations have explored mobile video domain. Capital chases up short video contents entrepreneurship programs. Since 2016, short video has become a new venture of content entrepreneurship and has entered into an explosive development period. With the expansion of short video users and the increase of the length of use, there is a problem of vulgarization and homogenization in the communication of short video content. The problem of ecological construction of short video contents is further highlighted.The essay is taking XinJing News “Our Video” as an example to analyze short video production strategies based on stickiness. “Our Video” produces short videos based on the concept of professional journalism. It is becoming the leading video live broadcast and short video production platform in China. “Our Video” constructs product’s stickiness through double brand strategy and cross-border convergence communication. Through the video album serialization and continuous video reports, users’ deep use is shaped; Through live broadcast, users presence, participation and interaction, users’ experience is optimized and the users’ stickiness is strengthened. With the increasing competition of short video industry, the rapid growth of short video market and the higher expectation of users for contents, short video competition in the future is an ecological competition based on contents. Keywords: stickiness, short video, our video, information constructio

A Pulsed Muon Source Based on a High-Repetition-Rate Electron Accelerator

Muons have established a unique and pivotal role in both fundamental physics and applied sciences. Given that a typical muon experiment spans roughly ten muon lifetimes, the optimal muon source should operate at around 50\,kHz in pulsed mode. However, existing muon facilities operate in either the 25-50\,Hz pulsed mode or continuous beam (DC) mode, which results in low-duty cycles for various muon experiments. As a result, precision muon physics with continuous muon beam has been limited by statistical uncertainty. In this study, we investigate the potential of a high-repetition-rate pulsed electron beam at the Shanghai SHINE facility to serve as a muon source driver. SHINE houses an 8-GeV CW superconducting RF linac, with a 1\,MHz bunch rate and 100\,pC bunch charge. Following X-ray production, the electron beam is deflected downstream of the undulators and absorbed in a beam dump. Using Geant4 Monte Carlo simulations, we estimated the yield of the muon beam to be approximately $10^{3}\mu^{\pm}$/bunch. This type of muon beam could be instrumental in a broad range of muon experiments, including muon lifetime measurement, a search for muonium to anti-muonium conversion, and the muon spin spectroscopy.Comment: 11 pages, 7 figures, 14th International Particle Accelerator Conference (IPAC'23

Static quadrupole moments of nuclear chiral doublet bands

The static quadrupole moments (SQMs) of nuclear chiral doublet bands are investigated for the first time taking the particle-hole configuration $\pi(1h_{11/2}) \otimes \nu(1h_{11/2})^{-1}$ with triaxial deformation parameters in the range $260^\circ \leq \gamma \leq 270^\circ$ as examples. The behavior of the SQM as a function of spin $I$ is illustrated by analyzing the components of the total angular momentum. It is found that in the region of chiral vibrations the SQMs of doublet bands are strongly varying with $I$, whereas in the region of static chirality the SQMs of doublet bands are almost constant. Hence, the measurement of SQMs provides a new criterion for distinguishing the modes of nuclear chirality. Moreover, in the high-spin region the SQMs can be approximated by an analytic formula with a proportionality to $\cos\gamma$ for both doublet bands. This provides a way to extract experimentally the triaxial deformation parameter $\gamma$ for chiral bands from the measured SQMs.Comment: 7 pages, 4 figure

Single-molecule real-time sequencing of the full-length transcriptome of Portunus pelagicus

Reconstruction and annotation of transcripts, particularly for a species without reference genome, plays a critical role in gene discovery, investigation of genomic signatures, and genome annotation in the pre-genomic era. This is the first study to use Single-molecule real-time (SMRT) sequencing for reporting the full-length transcriptome of Portunus pelagicus. Overall, 16.26 Gb of raw reads were obtained, including 7,068,387 subreads, with average length of 2,300 bp and N50 length of 3,594 bp. In total, 351,870 circular consensus sequences (CCS) reads were extracted, including 255,378 full-length non-chimeric (FLNC) reads with mean length of 3,423 bp.70,407 genes were obtained after eliminating redundant sequences, and 56,557 (80.33%) genes were annotated in at least one database, 17,267 (24.52%) genes were annotated in all of the seven databases. Further, 68,797 coding sequences (CDS) were identified, including 36,848 complete CDS. A total of 1,730 unigenes were predicted to be transcription factors (TFs). Finally, 11,894 long noncoding RNA (lncRNA) transcripts were predicted by different computational approaches and 147,262 single sequence repeat (SSR)s were obtained. The transcriptome data reported herein are bound to serve as a basis for future studies on P. pelagicus