Discovery of Middle Jurassic palaeontinids from Inner Mongolia, China (Homoptera: Palaeontinidae)

A new genus and three new species of fossil Palaeontinidae， Papilioncossus conchatus sp. nov., P. giganteus sp. nov.　and P. pteroideus sp. nov.， are described. All of them were collected from Middle Jurassic Jiulongshan Formation in Inner Mongolia, China. Based on distal part of forewing broader and longer than basal and Sc usually with branches, the new taxa are attributed to Palaeontinidae of Homoptera and compared with genus Pseudocossus. A key to species of Papilioncossus gen. nov. is provided. All type specimens are deposited in the Capital Normal University.     

Biodegradation of Straw Stalk and Experiment of Ethanol Fermentation

Biological preprocessing of lignin degradation of straw stalk with white-rot fungi and ethanol fermentation experiment are carried out. The result shows that after biological preprocessing, lignin content in straw stalk reduces significantly. The higher the lignin degradation rate, the higher the ethanol productivity. When the technique of solid state culturing to degrade lignin is adopted to produce ethanol, the productivity is 15.8%, which is equal to 374.4% of that produced without preprocessing process.     

Seasonal influence on the development of parthenotes and cloned embryos in pigs

Seasonal influence on the developmental ability of porcine embryos was studied by comparisons of the number of cumulus-oocytes-complexes (COCs) per ovary pair and meiotic maturation ability of oocytes in different seasons; and by the observations on developmental competence of the parthenogenetic oocytes and cloned embryos collected from different seasons. We found that the number of COCs per ovary pairs was significantly higher in spring compared to the other seasons (P<0.05). However, no significant difference was found in the rate of oocytes progressing to MⅡ in four seasons (P<0.05). In addition, the rate of blastocyst formation of parthenogenetic embryos in summer was obviously declined compared to the other seasons (P<0.05), and an increased blastocyst rate of cloned porcine embryos was found in spring compared to autumn and winter (P<0.05). The results suggest that there should be a seasonal influence on the developmental competence of porcine embryos.     

Detection of DNA methylation changes during seed germination in rapeseed （Brassica napus）

DNA methylation is a common yet important modi- fication of DNA in eukaryotic organisms. DNA methy- lation, especially methylation of cytosine (m5C), have both epigenetic and mutagenic effects on various cellu- lar activities such as differential gene exp…     

银在M-掺杂石墨烯上吸附的第一性原理计算

Graphene is an ideal reinforcing phase for a high-performance composite filler, which is of great theoretical and practical significance for improving the wettability and reliability of the filler. However, the poor adsorption characteristics between graphene and the silver base filler significantly affect the application of graphene filler in the brazing field. It is a great challenge to improve the adsorption characteristics between a graphene and silver base filler. To solve this issue, the adsorption characteristic between graphene and silver was studied with first principle calculation. The effects of Ga, Mo, and W on the adsorption properties of graphene were explored. There are three possible adsorbed sites, the hollow site (H), the bridge site (B), and the top site (T). Based on this research, the top site is the most preferentially adsorbed site for Ag atoms, and there is a strong interaction between graphene and Ag atoms. Metal element doping enhances local hybridization between C or metal atoms and Ag. Furthermore, compared with other doped structures (Ga and Mo), W atom doping is the most stable adsorption structure and can also improve effective adsorption characteristic performance between graphene and Ag.     

Microstructure evolution and nucleation mechanism of Inconel 601H alloy welds by vibration-assisted GTAW

Nickel-based alloys exhibit excellent high-temperature strength and oxidation resistance; however, because of coarse grains and severe segregation in their welding joints, these alloys exhibit increased susceptibility to hot cracking. In this paper, to improve the hot-cracking resistance and mechanical properties of nickel-based alloy welded joints, sodium thiosulfate was used to simulate crystallization, enabling the nucleation mechanism under mechanical vibration to be investigated. On the basis of the results, the grain refinement mechanism during the gas tungsten arc welding (GTAW) of Inconel 601H alloy under various vibration modes and parameters was investigated. Compared with the GTAW process, the low-frequency mechanical vibration processes resulted in substantial grain refinement effects in the welds; thus, a higher hardness distribution was also achieved under the vibration conditions. In addition, the γ' phase exhibited a dispersed distribution and segregation was improved in the welded joints with vibration assistance. The results demonstrated that the generation of free crystals caused by vibration in the nucleation stage was the main mechanism of grain refinement. Also, fine equiaxed grains and a dispersed γ' phase were found to improve the grain-boundary strength and reduce the segregation, contributing to preventing the initiation of welding hot cracking in nickel-based alloys.     

基于FCM-ELM-BBPS的预测控制参数整定

模型预测控制设计参数选择显著影响被控系统性能，目前基于专家经验的主流参数整定方法会出现控制器鲁棒性差、计算成本高等缺点.为了解决上述问题，提出一种基于模糊C均值-极限学习机-裸骨粒子群（Fuzzy C-means-Extreme Learning Machine-Bare Bones Particle Swarm， FCM-ELM-BBPS）的参数整定算法.通过模糊C均值算法（Fuzzy C-means， FCM）聚类进行数据预处理，将被控系统复杂数据根据自身特征进行聚类，以降低神经网络的训练误差，提高预测精度；针对每一类特征数据，利用极限学习机（Extreme Learning Machine， ELM）建立预测控制参数与性能指标的映射关系模型，并进一步获得参数整定规则；采用裸骨粒子群（Bare Bones Particle Swarm， BBPS）优化算法进行预测控制参数整定，通过采用高斯分布来更新粒子位置，加快目标函数的收敛速度，从而有效地减少参数寻优时间；分别进行仿真和水箱系统实验验证，证明了提出算法的有效性.实验结果表明，本文提出的算法与现有方法相比，更具有优越性，其中整定时间减少了34.84%，同时在调整时间等时域性能指标上提升了43.98%.     

Porous bismuth nanocrystals with advanced sodium ion storage property

Bismuth-based materials are ideal electrodes for sodium-ion batteries(SIBs) due to their high capacity and low cost. However, conventional solid bismuth materials still suffer from severe volume expansion during the reaction process, which hinders its application. Herein, single-crystal bismuth nanospheres with diameters in the range of200–400 nm were successfully prepared with the Na–Bi alloying mechanism studied using in-situ XRD, which confirms a stepwise process of Bi→NaBi→Na3Bi with large v...     

Design and implementation of instruction-driven and data-driven self-reconfigurable cell array

The reconfigurable chip, which integrates the advantages of high performance, high flexibility,high parallelism, low power consumption, and low cost, has achieved rapid development and wide application. Generally, the control part and the computing part of algorithm is accelerated based on different reconfigurable architectures, but it is difficult to obtain overall performance improvement.For improving efficiency of reconfigurable structure both for the control part and the computing part,a hyb...