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Search for long-lived particles using calorimeter timing at the LHC
Kim Jeong Hwa,PADMANABAN JAYASHRI,Yoo Jae Hyeok 한국물리학회 2022 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.80 No.5
Long-lived particles (LLPs) are predicted in various theories beyond the Standard Model (SM). Given their non-standard nature, specialized techniques are needed for their detection. The LLPs, when produced at the LHC, travel a considerable distance before decaying into SM particles that are subsequently captured by a detector. However, when the LLPs are not boosted enough, they travel slowly and produce delayed particles. By measuring the timing of such decay products, one can test the existence of the LLPs. Calorimeter timing is an excellent tool for this, and we demonstrate that it brings improvement in sensitivity to a gauge-mediated SUSY breaking model. In particular, this work suggests that a dedicated trigger using calorimeter timing can provide a significant enhancement of sensitivity.
Suman Tripathi,Maheshwar Sharon,N.N. Maldar,Jayashri Shukla,Madhuri Sharon 한국탄소학회 2013 Carbon Letters Vol.14 No.4
The synthesis of carbon nanomaterials (CNMs) by a chemical vapor deposition method using three different plant oils as precursors is presented. Because there are four param-eters involved in the synthesis of CNM (i.e., the precursor, reaction temperature of the furnace, catalysts, and the carrier gas), each having three variables, it was decided to use the Taguchi optimization method with the ‘the larger the better’ concept. The best parameter regarding the yield of carbon varied for each type of precursor oil. It was a temperature of 900°C + Ni as a catalyst for neem oil; 700°C + Co for karanja oil and 500°C + Zn as a catalyst for castor oil. The morphology of the nanocarbon produced was also impacted by different parameters. Neem oil and castor oil produced carbon nanotube (CNT) at 900°C; at lower temperatures, sphere-like structures developed. In contrast, karanja oil produced CNTs at all the assessed temperatures. X-ray diffraction and Raman diffraction analyses confirmedthat the nanocarbon (both carbon nano beads and CNTs) produced were graphitic in nature.
Impact of Cannabis Use on Long-Term Remission in Bipolar I and Schizoaffective Disorder
김성완,Seetal Dodd,Lesley Berk,Jayashri Kulkarni,Anthony de Castella,Paul B. Fitzgerald,김재민,윤진상,MIchael Berk 대한신경정신의학회 2015 PSYCHIATRY INVESTIGATION Vol.12 No.3
ObjectiveaaTo investigate the impact of regular cannabis use on long-term remission of mood symptoms in bipolar spectrum disorders. MethodsaaThe 24-month prospective observational study included patients (n=239) with bipolar I disorder and schizoaffective disorder, bipolar type. Participants were classified as regular cannabis users (three times or more per week) or non-users. The primary outcome measure was the achievement of remission on the evaluations during the 24 months. ResultsaaOf the 234 participants for whom data was available, 25 (10.7%) were regular cannabis users, and the group comprised significantly more males than females. In the total population, cannabis use was significantly associated with decreased likelihood of remission during the 24-month follow-up period. Subgroup analyses showed that cannabis use was significantly associated with lower remission rates on the Hamilton Depression Rating Scale in females (n=139) and patients prescribed mood stabilizers alone (n=151), whereas in males (n=95) and patients prescribed olanzapine and/or a mood stabilizer (n=83), cannabis use was significantly associated with lower remission rates on the Young Mania Rating Scale. Remission rates were lowest in the concurrent cannabis and tobacco smoking group (n=22) followed by the tobacco smoking only group (n=97), and the non-smoker group (n=116). The post-hoc analysis revealed that all remission rates were significantly lower in the concurrent cannabis and the tobacco smoking group compared to the non-smoker group. ConclusionaaCannabis use negatively affects the long-term clinical outcome in patients with bipolar spectrum disorders. A comprehensive assessment and integrated management of cannabis use are required to achieve better treatment outcomes for bipolar spectrum disorders.