PETROLOGY OF BLUESCHIST IN WESTERN YUNNAN PROVINCE,CHINA,AND ITS TECTONIC SIGNIFICANCE

The blueschists in western Yunnan Province are distributed in Lancangjiang and Ailaoshan metamorphic belts and occur as interlayer in green schist and mica schist. Their protolith is basaltic and pelitic rocks with a mineral assemblage of Cr (or Win)+Ab+Qz+Chl+Ph+Ep+Sph+Act and Gl+Ph+Tc+Ep+Alm+Qz+Do, respectively. The P-T conditions of blueschist metamorphism range from 170—443℃ at c. 4—6. 7 kbar. The origin of blue schist of the Lancangjiang belt is related to the subduction and the close of the paleo-Tethys oceanic basin. The Ailaoshan blueschist, however, may be related to the continent continent collision and the dynamic metamorphism.     

Growth of TiO2 nanosheet-array thin films by quick chemical bath deposition for dye-sensitized solar cells

Rutile TiO₂ nanofilms, which were composed of many nanosheet-array domains with different orientations, were synthesized directly on fluorine-doped SnO₂ conductive glass (FTO) substrates by a chemical deposition method in a short time in this paper. The average thickness of the nanosheets is about 10 nm; the nanosheets in each domain were parallel to each other and perpendicular to the substrate. The size and profile of the domains have a good correspondence to those of the FTO grains of the substrate, indicating a coherent nucleating and epitaxial growing nature of the films. The nanosheets split gradually and finally developed into nanofibers on prolonging the growing time to 20 h. Dye-sensitized solar cells, which were fabricated with the films, present an open-circuit voltage of 0.63 V and a short-circuit current of 7.02 mA/cm², respectively.     

Efficient and stereoselective synthesis of thiosulfinates from disulfide using cumene hydroperoxide in the presence of titanium-based catalyst systems

Abstract

An efficient and stereoselective procedure of oxidizing disulfide to thiosulfinate 2a using CHP as the oxidant and economically available Ti(O-i-Pr)₄/L-DET/H₂O as catalysts were developed. The reaction went smoothly under mild conditions with synthetic useful yield and the workup for obtaining the final product is quite convenient.     

铁基氮化物在储能及电催化领域中的研究进展

氮化铁具有硬度高、熔点高、热导性高、耐腐蚀、安全无污染、电子导电性优异以及类铂的电子结构等优势,且其原材料资源丰富、成本低廉,在储能与电催化等众多领域中有着极大的应用前景。本文综述了铁基氮化物在结构、制备、性能和应用方面的研究进展,重点关注其制备方法和在储能领域(如锂离子电池、钠离子电池、锂硫电池)、电催化领域(如氢析出反应、氧析出反应、氧还原反应)中的应用,同时对铁基氮化物存在的主要问题进行了总结,对其未来的研究方向和应用前景进行了展望。     

Robustness of Cooperation on Highly Clustered Scale-Free Networks

We study the effect of mutation on the evolutionary prisoner＇s dilemma in highly clustered scale-free networks. It is found that cooperation is more sensitive and vulnerable to strategy mutation in more highly clustered networks. For small mutation rates, high clustering coefficient promotes cooperation. For medium mutation rates, high clustering coefficient inhibits the emergence of cooperation. For large mutation rates, cooperation is insensitive to clustering property. We provide explanations for the effects of clustering on cooperation with varied mutation rates.     

结构参数对偶极声波换能器谐振频率的影响

偶极横波远探测技术在我国复杂地质结的构油气勘探中具有十分广阔的应用前景。换能器的工作频率直接影响声波测井的探测深度。本文对正交偶极声波测井换能器弯曲模态的谐振频率进行了解析计算,并利用有限元方法研究了其结构参数对谐振频率的影响。计算结果表明:当压电陶瓷片的长度增加时,换能器一阶谐振频率先降低后升高,三阶谐振频率先升高再降低之后又上升;当金属基片厚度增加时,换能器一阶与三阶谐振频率均升高;当压电陶瓷片厚度增加时,换能器谐振频率的变化方向与幅度还与压电陶瓷片长度等其他参数相关,有可能升高或降低。     

HBsAg 对脂多糖诱导树突状细胞分泌IL-6和IL-12的影响

目的 研究HBsAg 对脂多糖诱导树突状细胞（DCs）分泌IL-6 和IL-12 的影响。方法 采用重组人粒- 单核 集落刺激因子（rhGM-CSF）联合重组人白细胞介素4（rhIL-4）诱导单个核细胞得到未成熟树突状细胞（iDCs）,分别加入HBsAg1、2、5μg/ml,并设对照组,各组再加入脂多糖诱导为成熟DCs。采用流式细胞术鉴定各组iDCs 的表型（CD11c、HLA-DR）,ELISA 法检测脂多糖诱导后培养上清液中IL-6 和IL-12 的水平。结果 iDCs 的CD11c/ HLA-DR 双阳性率为（83.62±6.89）%,显著高于单纯培养组（20.57±11.19）%,差异有统计学意义（P＜0.05）。HBsAg 1、2、5μg/ml 组培养上清液中IL-6 分别为（609.36±127.06）、（566.01±173.46）、（295.03±76.08）pg/ml,低于对照组（1356.97±181.78）pg/ml（均P＜0.05）;HBsAg2、5滋g/ml 组IL-12 分别为（854.49±67.92）、（472.09±55.70）pg/ml,低于对照组（1248.78±112.09）pg/ml（均P＜0.05）;1滋g/ml 组IL-12（1103.53±134.15）pg/ml,与对照组比较差异无统计学意义（P＞0.05）。结论 低浓度HBsAg 可下调脂多糖诱导的DCs 细胞因子分泌。     

可计算一般均衡求解中多要素CES函数的线性化表达

CES函数的线性化是可计算一般均衡求解过程中不可绕开的问题.在Gohin和Hertel(2003)给出的两要素(n=2)CES函数线性化的基础上,基于成本最小化的一阶条件,推导了两个及两个以上要素(n≥2)情况下CGE函数的线性化过程,进而在替代弹性趋近于1和0的条件下,分别得到了多要素CD函数和Leontief函数的线性化表达.所得到的表达方式更为简洁和一般化,能够提高CGE建模效率.     

装备维修器材生产路径双目标问题优化决策方法研究

在装备维修器材供应保障中,针对精确保障背景下部队用户对器材保障精度的要求,构建了最小化总成本和最大化订单精准执行率的双目标优化决策模型。在ε-约束法框架内,开发可生成近似Pareto前沿的两阶迭代启发式算法,并采用模糊逻辑决策法选择符合决策者偏好的折中最优解。随机实例测试结果表明所提出的模型和算法可以很好地应用在双目标优化问题的研究中,并在求解不同规模实例时表现出优异的性能。     

Asymptotic entropy of the ranges of random walks on discrete groups

Inspired by Benjamini et al.(2010) and Windisch(2010),we consider the entropy of the random walk ranges R_n formed by the first n steps of a random walk S on a discrete group.In this setting,we show the existence of h_R:=lim_(n→∞)H(R_n)/n called the asymptotic entropy of the ranges.A sample version of the above statement in the sense of Shannon(1948) is also proved.This answers a question raised by Windisch(2010).We also present a systematic characterization of the vanishing asymptotic entropy of the ranges.Particularly,we show that h_R=0 if and only if the random walk either is recurrent or escapes to negative infinity without left jump.By introducing the weighted digraphs Γ_n formed by the underlying random walk,we can characterize the recurrence property of S as the vanishing property of the quantity lim_(n→∞)H(Γ_n)/n,which is an analogue of h_R.