Fuzzy portfolio model with different investor risk attitudes

We propose a fuzzy portfolio model designed for efficient portfolio selection with respect to uncertain or vague returns. Although many researchers have studied the fuzzy portfolio model, no researcher has yet attempted a behavioral analysis of the investor in the fuzzy portfolio model. To address this problem, we examined investor risk attitudes—risk-averse, risk-neutral, or risk-seeking behaviors—to discover an efficient method for fuzzy portfolio selection. In this study, we relied on the advantages of possibilistic mean–standard deviation models that we believed would fit the risk attitudes of investors. Thus, we developed a fuzzy portfolio model that focuses on different investor risk attitudes so that fuzzy portfolio selection for investors who possess different risk attitudes can be achieved more easily. Finally, we presented a numerical example of a portfolio selection problem to illustrate ways to address problems presented by a variety of investor risk attitudes.     

高功率激光能量测试的卡计系数标定技术

提出在卡计系数标定中采用直线拟合方法,综合考察相关系数、斜率、截距、斜率和截距标准偏差等参数,以斜率相对标准偏差作为采用何种直线拟合的主要判断依据;若过零直线拟合的斜率相对标准偏差小于不过零的斜率相对标准偏差,认为截距为随机误差,卡计系数标定按照非等精度的加权平均法求解;反之,应按照不过零直线拟合,截距为测试的系统误差,根据定位回归误差大小判断并剔除粗大误差;这样可以合理给出激光能量测试的卡计标定系数。     

铟活化诊断氘氘中子产额不确定度分析

介绍了铟活化诊断氘氘中子产额的测量原理,分析了中子产额测量不确定度的来源及评定方法。中子产额测量不确定度主要由灵敏度标定不确定度、活化射线净计数不确定度、立体角测量不确定度及测量系统的随机误差等构成。评估了灵敏度标定过程中加速器中子与聚变中子能量差异、大厅散射中子本底等因素对灵敏度标定的影响,并评估了宇宙射线本底对活化射线净计数测量的影响。分析了中子产额处于不同量级时起主要作用的不确定度分量,提出了减小灵敏度标定不确定度的方法。以实验数据为基础,对具体的实验数据进行了分析计算。结果表明:利用伴随粒子法在加速器中子源上标定出铟活化测量系统灵敏度的相对标准不确定度为4.3%。中子产额低于1010时,产额测量不确定度大于7%,活化射线净计数误差是产额测量误差的主要来源;产额大于1010时,测量不确定度好于7%,中子产额测量不确定度主要由灵敏度标定不确定度引起。     

Cs_2ZnCl_4标准生成焓

用新型的具有恒定温度环境的反应热量计，以０．０３ｍｏｌ·Ｌ－１Ｈ２ＳＯ４溶液力量热溶剂，分别测定了［２ＣｓＣｌ（ｓ）＋ＺｎＣｌ２（ｓ）］和Ｃｓ２ＺｎＣｌ４（ｓ）的溶解烙、设计了一个热化学循环，求出了Ｃｓ２ＺｎＣｌ４的标准生成焓，推荐其值为：     

Controlled multistage selection procedures for comparison with a standard

Comparison with a standard is a general multiple comparison problem, where each system is required to be compared to a single system, referred to as a “standard”, as well as to other alternative systems. The goal is to determine the best system among a number of systems that are better than the standard, or to select the standard when it is equal to or better than the other alternatives. Kim (2005) proposed an efficient fully sequential procedure for comparison with a standard, that obtains a single observation at each stage from the surviving systems, and is one of the most efficient existing procedures. We develop two provably valid multistage selection procedures that take a number of observations from each system and update the variance estimators at each stage. We also employ appropriate control variate technique for each procedure to further improve the efficiency. Empirical results are provided to demonstrate that the proposed procedures are statistically and computationally more efficient than existing fully sequential procedures.     

Experimental estimates of compression heating and decompression cooling in ethylene glycol

The chemical shift difference, Δσ, between the methylene and hydroxyl protons in the high resolution ¹H nuclear magnetic resonance spectrum of ethylene glycol is shown to be pressure dependent. The equilibrium Δσ values for ethylene glycol are reported as a function of temperature and pressure between ambient conditions, 323 K and 2 kbar, respectively. This surface is used along with Δσ values measured in response to a rapid pressure increase to calculate a temperature rise that is used to infer a temperature change for water that is consistent with theoretical estimates. This work implies that compression heating and decompression cooling are not significant enough to interfere with pressure induced protein folding studies.     

Adaptively Secure Efficient (H)IBE over Ideal Lattice with Short Parameters

Identity-based encryption (IBE), and its hierarchical extension (HIBE), are interesting cryptographic primitives that aim at the implicit authentication on the users’ public keys by using users’ identities directly. During the past several decades, numerous elegant pairing-based (H)IBE schemes were proposed. However, most pairing-related security assumptions suffer from known quantum algorithmic attacks. Therefore, the construction of lattice-based (H)IBE became one of the hot directions in recent years. In the setting of most existing lattice-based (H)IBE schemes, each bit of a user’s identity is always associated with a parameter matrix. This always leads to drastic but unfavorable increases in the sizes of the system public parameters. To overcome this issue, we propose a flexible trade-off mechanism between the size of the public parameters and the involved computational cost using the blocking technique. More specifically, we divide an identity into l′ segments and associate each segment with a matrix, while increasing the lattice modulo slightly for maintaining the same security level. As a result, for the setting of 160-bit identities, we show that the size of the public parameters can be reduced by almost 89.7% (resp. 93.8%) while increasing the computational cost by merely 5.2% (resp. 12.25%) when l′ is a set of 16 (resp. 8). Finally, our IBE scheme is extended to an HIBE scheme, and both of them are proved to achieve the indistinguishability of ciphertexts against adaptively chosen identity and chosen plaintext attack (IND-ID-CPA) in the standard model, assuming that the well-known ring learning with error (RLWE) problem over the involved ideal lattices is intractable, even in the post-quantum era.     

银离子与亚铁离子反应可逆性的热力学研究

以一道北京高考题为切入点，利用标准电极电势计算Ag++Fe2+=Ag+Fe3+的平衡常数和电动势。运用能斯特方程，计算非标准状态下该反应的电动势，理论上证实逆反应可以实现。设计原电池装置，通过改变离子浓度，实现电流表指针的反转，验证该氧化还原反应确有可逆性。     

Linear seesaw model with T7 symmetry for neutrino mass and mixing

We propose a low-scale Standard Model extension with \begin{document}$T_7\times Z_4 \times Z_3\times Z_2$\end{document} symmetry that can successfully explain observed neutrino oscillation results within the \begin{document}$3 \sigma$\end{document} range. Small neutrino masses are obtained via the linear seesaw mechanism. Normal and inverted neutrino mass orderings are considered with three lepton mixing angles in their experimentally allowed \begin{document}$3\sigma$\end{document} ranges. The model provides a suitable correlation between the solar and reactor neutrino mixing angles, which is consistent with the \begin{document}${\rm{TM}}_2$\end{document} pattern. The prediction for the Dirac phase is \begin{document}$\delta_{\rm CP}\in (295.80, 330.0)^\circ$\end{document} for both normal and inverted orderings, including its experimentally maximum value, while those for the two Majorana phases are \begin{document}$\eta_1\in (349.60, 356.60)^\circ,\, \eta_2=0$\end{document} for normal ordering and \begin{document}$\eta_1\in (3.44, 10.37)^\circ, \, \eta_2=0$\end{document} for inverted ordering. In addition, the predictions for the effective neutrino masses are consistent with the present experimental bounds.     

八面体纳米钼酸钡的制备及标准摩尔生成焓的测定

根据热力学势函数法建立纳米钼酸钡与块体钼酸钡标准摩尔生成焓之间的关系, 利用原位微量热技术获取纳米钼酸钡与盐酸反应的反应热, 以已知的块体钼酸钡的标准摩尔生成焓－1507.5 kJ•mol^－1为参考标准, 求得由反相微乳液法制备的八面体纳米钼酸钡的标准摩尔生成焓为(－336.62±0.33) kJ•mol^－1, 两种材料标准摩尔生成焓数值的差异证明纳米结构比块体结构能态更高, 更加不稳定.