Non-spectator Contributions To The Lifetime of Λb\Lambda_{b}

In this work, we evaluate the contributions of non-spectator effects to the lifetimes of $\Lambda_b$ and B-mesons. Based on the well-established models and within a reasonable range of the concerned parameters, the contributions can reduce the lifetime of $\Lambda_b$ by $7 \sim 8$ compared to that of B-mesons which are not significantly affected. This might partly explain the measured ratio $\tau(\Lambda_{b})/\tau(B^{0})=0.79$ \cite{Data}, which has been a long-standing discrepancy between theory and experimental data

Non-Borrowing Students’ Perceptions of Student Loans and Strategies of Paying for College

With the notable shift from grants to loans over the past several decades, many researchers have argued the positive impact of financial aid on student college choice, enrollment, and persistence. However, literature indicates that students from economically disadvantaged backgrounds are less likely to take loans to finance postsecondary education than those from affluent conditions. Qualitative research on the reasons for non-borrowers’ aversion to loans and strategies for college payment is rather scant. This study explores 30 lower- or lower-middle-class non-borrowing students’ lived experiences surrounding student loans from a qualitative phenomenological research lens. Data are collected from semi-structured interviews. Data analysis shows four main reasons that the participants generally avoid borrowing as they decide where to attend and how to pay for college: parental influence, fear of economic burden, underestimation of the value of college education, and lack of information about the loan system. The strategies they employ for college payment include scholarships and grants, family support, part-time jobs, and prepaid college tuition programs. This study uses peer debriefing to ensure its trustworthiness. Limitations of this study and implications for future research and practice are discussed

Research on a New Signature Scheme on Blockchain

With the rise of Bitcoin, blockchain which is the core technology of Bitcoin has received increasing attention. Privacy preserving and performance on blockchain are two research points in academia and business, but there are still some unresolved issues in both respects. An aggregate signature scheme is a digital signature that supports making signatures on many different messages generated by many different users. Using aggregate signature, the size of the signature could be shortened by compressing multiple signatures into a single signature. In this paper, a new signature scheme for transactions on blockchain based on the aggregate signature was proposed. It was worth noting that elliptic curve discrete logarithm problem and bilinear maps played major roles in our signature scheme. And the security properties of our signature scheme were proved. In our signature scheme, the amount will be hidden especially in the transactions which contain multiple inputs and outputs. Additionally, the size of the signature on transaction is constant regardless of the number of inputs and outputs that the transaction contains, which can improve the performance of signature. Finally, we gave an application scenario for our signature scheme which aims to achieve the transactions of big data on blockchain