Transverse profile expansion and homogenization at target for the injector Scheme-I test stand of China-ADS

For the injector Scheme-I test stand of the China-ADS, a beam with the maximum power of 100 kW will be produced and transported to the beam dump. At the beam dump, the beam power will be converted to thermal load and brought away by the cooling water. Two measures are taken to deal with the huge power density at the target. One is to enlarge the contact area between the beam and the target, and this is to be accomplished by expanding the beam profile at the target and using two copper plates each having a 20o inclination angle relative to the beam direction. The other is to produce more homogenous beam profile at the target to minimize the maximum power density. Here the beam dump line is designed to meet the requirement of beam expansion and homogenization, and the step-like field magnets are employed for the beam spot homogenization. The simulations results including space charge effects and errors show that the beam line can meet the requirements very well at the three different energies (3.2 MeV, 5 MeV and 10 MeV). In the meantime, the alternative beam design using standard multipole magnets is also presented.Comment: 5 pages, 6 table

Spurious Shell Closures in the Relativistic Mean Field Model

Following a systematic theoretical study of the ground-state properties of over 7000 nuclei from the proton drip line to the neutron drip line in the relativistic mean field model [Prog. Theor. Phys. 113 (2005) 785], which is in fair agreement with existing experimental data, we observe a few spurious shell closures, i.e. proton shell closures at Z=58 and Z=92. These spurious shell closures are found to persist in all the effective forces of the relativistic mean field model, e.g. TMA, NL3, PKDD and DD-ME2.Comment: 3 pages, to appear in Chinese Physics Letter

Non-local mean field effect on nuclei near Z=64 sub-shell

Evolutions of single-particle energies and Z=64 sub-shell along the isotonic chain of N=82 are investigated in the density dependent relativistic Hartree-Fock (DDRHF) theory in comparison with other commonly used mean field models such as Skyrme HF, Gogny HFB and density dependent relativistic Hartree model (DDRMF). The pairing is treated in the BCS scheme, except for Gogny HFB. It is pointed out that DDRHF reproduces well characteristic features of experimental $Z$-dependence of both spin orbital and pseudo-spin orbital splittings around the sub-shell closure Z=64. Non-local exchange terms of the isoscalar $\sigma$ and $\omega$ couplings play dominant roles in the enhancements of the spin-orbit splitting of proton 2d states, which is the key ingredient to give the Z=64 sub-shell closure properly. On the other hand, the $\pi$ and $\rho$ tensor contributions for the spin-orbit splitting cancel each other and the net effect becomes rather small. The enhancement of the sub-shell gaps towards Z=64 is studied by the DDRHF, for which the local terms of the scalar and vector meson couplings are found to be important.Comment: 4 figure

Reliability and security in low power circuits and systems

With the massive deployment of mobile devices in sensitive areas such as healthcare and defense, hardware reliability and security have become hot research topics in recent years. These topics, although different in definition, are usually correlated. This dissertation offers an in-depth treatment on enhancing the reliability and security of low power circuits and systems. The first part of the dissertation deals with the reliability of sub-threshold designs, which use supply voltage lower than the threshold voltage (Vth) of transistors to reduce power. The exponential relationship between delay and Vth significantly jeopardizes their reliability due to process variation induced timing violations. In order to address this problem, this dissertation proposes a novel selective body biasing scheme. In the first work, the selective body biasing problem is formulated as a linearly constrained statistical optimization model, and the adaptive filtering concept is borrowed from the signal processing community to develop an efficient solution. However, since the adaptive filtering algorithm lacks theoretical justification and guaranteed convergence rate, in the second work, a new approach based on semi-infinite programming with incremental hypercubic sampling is proposed, which demonstrates better solution quality with shorter runtime. The second work deals with the security of low power crypto-processors, equipped with Random Dynamic Voltage Scaling (RDVS), in the presence of Correlation Power Analysis (CPA) attacks. This dissertation firstly demonstrates that the resistance of RDVS to CPA can be undermined by lowering power supply voltage. Then, an alarm circuit is proposed to resist this attack. However, the alarm circuit will lead to potential denial-of-service due to noise-triggered false alarms. A non-zero sum game model is then formulated and the Nash Equilibria is analyzed --Abstract, page iii

Strolling through the Enchanting Back Garden of the HeartBook Review: Philosophical Poetry in Ancient China Translated by Han Wei

In a state of excitement, I opened this long-anticipated Philosophical Poetry in Ancient China, and my memories seemed to instantly transport me back to that brilliant and affectionate old dream. The first time I encountered Dr. Han Wei’s work was in 2016 when I had just arrived in Guilin. At that time, facing the world’s unparalleled picturesque mountains and serene rivers outside my window, hearing the gentle drizzle in the spring breeze, and breathing in the elegant and mellow aroma of osmanthus, all my senses became acutely attuned. The dormant dreams within me reawakened, and the inspirations that leaped in my heart were no longer mere dust stirred by the northern winds..

Interview with Yudi Yap: A Humanistic Vocalist and Songwriter on Music, Life, and Cultural Expression

Yudi Yap, renowned as a charismatic vocalist, has been a time-honored household name in the Malaysian music scene, with a performing career spanning over a quarter of a century. Initially trained in Fine Arts, Yudi embarked on her musical journey during her student days with “Pertubuhan Muzik KITA” (激荡工作坊)”. In the 1990s, she served as the lead vocalist of the acclaimed trio “Alternative Music House” (另类音乐人) and also co-organized two editions of the influen-tial campus songwriting competition, the “Halo Songwriting Contest” (海螺新韵奖). Since the early 2000s, Yudi has ac-tively revived and interpreted classic songs from the Golden Era, earning widespread acclaim in performing arts circles, including performances in numerous Chinese and English musicals. She has spearheaded over ten nostalgic concert productions, including “Scent of Rose. Scent of Love” (玫瑰爱情香), “Good Old Tunes” (好老歌), “Lin Dai – The Star of Stars” (林黛。绝代星海女皇), and “Modern Nanyang” (摩登南洋). In 2013, her concert “Kopisusu” (咖啡酥酥), deep-ly infused with Nanyang local flavor, resonated strongly with audiences, receiving eight nominations at the prestigious 11th Boh Cameronian Arts Awards, where Yudi won both “Best Solo Performance” and “Best Group Performance.” “Kopisusu” was also invited by the National Arts Council of Singapore as the opening performance for their annual “Silver Arts Festival” in 2014. Collaborating with the acclaimed art-ist Ah Niu, Yudi co-wrote numerous popular songs including “Peach Blossoms” (桃花朵朵开), “Lai Lai Song” (来来歌), and “The Swinging Hemline” (裙摆摇摇). Her original com-position, “Strolling Underneath the Moonlight” (漫步月光下), won the Top 10 Songs of the Year at the Malaysia PWH Music Awards. Additionally, her song “Fa Hua” (髪花), the theme song for the TV drama “The Iron Lady” (女头家), re-ceived the Best Theme Song Award at the inaugural Golden Television Awards. Her classic track from the Alternative Music House era, “Mind Your Heart. Love Your Soul” (你要小心保护你的心), remains an iconic representation of her artistic identity. In 1992, representing Malaysia, Yudi partic-ipated in the “Sumitomo One World College Pop Festival” in Tokyo, winning the “Best Voice Award.” Starting in 2012, Yudi played a key role in the musical “Princess Wen Cheng The Light of Snowland” (文成公主-雪域上的光芒), performing at Singapore’s Esplanade Theatre in 2013 and tour-ing in Xi’an, Busan, and Kuala Lumpur. Yudi has also been actively involved as a judge on numerous Malaysian TV mu-sic competitions, including NTV7’s “Who Will Win,” 8TV’s “Super Voice,” and Astro Classic Golden Melody Singing Contest over multiple seasons. Beyond singing, Yudi con-tributes as a writer, having authored music columns such as “Zhong Sheng Xuan Hua” (众声喧哗) in Sin Chew Daily (星洲日报), art columns in “New Tide” (新潮) magazine, and music articles in “Feng” (丰) magazine, frequently invit-ed to publish pieces across various media outlets. From her early days with the “Pertubuhan Muzik KITA” to her classic performances, Yudi has released five solo albums including “Mind Your Heart. Love Your Soul” (你要小心保护你的心), “Shades of Passion” (情调), “Kopisusu” (咖啡酥酥), “Jalan Jalan” (惹兰), and “Then and Now” (那时•今日), as well as eight collaborative albums