EFFECT OF ELECTRODEPOSITED Cr2O3 OXIDE FILM ON THE OXIDATION OF Fe3Al

A uniform, dense and defect free Cr₂O₃ thin film, which is amorphous at ambient temperature, was applied on the surface of intermetallic Fe₃Al by electrodeposition reaction sintering, and the effect of this film on the oxidation of Fe₃Al at 900℃ in air was studied. The films and the oxide scales were analyzed by TEM, EDAX,SEM and XRD.It is proved that, by surface applied Cr₂O₃ thin film,a continuous, protective,fine grained α-Al₂O₃ scale was formed on Fe₃Al. As a result, the adherence of the scale and oxidation resistance of Fe₃Al were improved.     

Factors Influencing the Sulfidation Rate of Fe-Mo Binary Alloys

The sulfidation rate constants of various Fe-Mo binary alloys in S₂ vapor with different sulfidation parameters were collected to summarize the correlation between the sulfidation rate and alloy composition, sulfur pressure and sulfldation temperature. The octivation energies indicate that the sulfidation process of the alloys is exclusively controlled, at a given temperature, by one alloying component i.e. either Mo or Fe. The sulfidation rate declines exponentially with the increasing of Mo content in alloy. And the influence of sulfur pressure is relatively slight.     

FRACTAL STRUCTURE OF THE CORE LOSS SPECTURM OF Fe-B-Si AMORPHOUS SOFT MAGNETIC ALLOY

The core loss spectrum P(f) of Fe-B-Si amorphous soft magnetic alloy has been studied.It is found that P(f) has the fractal structure.The effect of heat treatment on the fractal dimension D_f is discussed.     

温盐环流在百年尺度上影响中国气候的一个数值模拟证据

基于使用全耦合模式的末次冰消期(显著的全球增暖阶段)瞬变模拟结果, 通过敏感性试验明确指出温盐环流(Thermohaline Circulation, THC)在百年尺度上大幅度影响中国气候, 特别是在气候突变阶段. 结果表明, 该瞬变模拟中中国地区的气候演变符合古气候资料的纪录, 如Bølling-Allerød(BA)增暖事件期间中国地区的年平均气温大幅度升高; 在敏感性试验中, 当人为限制THC在BA事件期间的变化幅度时, 中国地区的升温幅度明显减小. 结果同时表明, 除温室气体、太阳辐射强度因素外, THC是另外一个在百年尺度上影响中国气候的重要因素.     

基于支持向量机的InSAR干涉图相位解缠法

提出了一种基于支持向量机的InSAR干涉图区域分割相位解缠法,以支持向量机为分类工具,利用干涉图中的残差点、相位导数方差等相位属性对干涉图中像元分类,把干涉图分割成高质量非掩模区域和低质量掩模区域.先用改进的Itoh方法对非掩模区域解缠,然后应用区域生长策略对掩模区域解缠.最后用真实的和模拟的干涉相位图试验表明算法比现有的传统算法如枝切法等InSAR干涉图相位解缠方法更有效.     

PTPRD (protein tyrosine phosphatase receptor type delta) is associated with restless legs syndrome

We identified association of restless legs syndrome (RLS) with PTPRD at 9p23-24 in 2,458 affected individuals and 4,749 controls from Germany, Austria, Czechia and Canada. Two independent SNPs in the 5' UTR of splice variants expressed predominantly in the central nervous system showed highly significant P values (rs4626664, P(nominal/lambda corrected) = 5.91 x 10(-10), odds ratio (OR) = 1.44; rs1975197, P(nominal/lambda corrected) = 5.81 x 10(-9), OR = 1.31). This work identifies PTPRD as the fourth genome-wide significant locus for RLS.     

Cathodic micro-arc electrodeposition of yttrium stabilized zirconia (YSZ) coatings on FeCrAl alloy

Zirconia-based coatings, especially yttrium stabilized zirconia (YSZ), are the best ceramic coatings for high temperature applications due to their superior mechanical and thermal behavior[1]. And YSZ is of considerable in-terest for applications in solid-oxide fuel cells due to its high oxygen-ion conductivity and stability in oxidizing and reducing atmospheres, oxygen sensors and microelec-tronic devices[2]. The traditional methods to produce the YSZ coatings are plasma spray, electron be…     

Investigation on propagation process of electrically induced fatigue cracking using AFM

Propagation process of electrically induced fatigue cracking in BaTiO3 single crystal has been studied using atomic force microscope （AFM）. The results show that alternating electric field generates a random domain switching around indentation cracks instead of a cyclic domain switching and an arrest indentation crack can be re-initiated by applying either positive or negative alternating electric field.     

Molecular identification and phylosenetic position of Cuora yunnanensis

The Yunnan box turtle （Cuora yunnanensis, Boulenger, 1906）, which has drawn much attention in conservation biology, was regarded as extinct since it was previously known only from 12 specimens collected in Yunnan, China, before 1908. Recently, live specimens have been discovered which are suggested to be C. yunnanensis. To determine whether the newly discovered specimens are really C. yunnanensis, we have established a molecular phylogeny, with a 1725-bp fragment of mitochondrial DNA, using samples from three live individuals of C. yunnanensis, together with sequence data from a museum specimen of C. yunnanensis （MNHN 1907.10） and other members of the genus Cuora. We found that the three newly discovered individuals and the old museum specimen of C. yunnanensis are very similar both in morphology and in mitochondrial DNA sequence, suggesting that the three new individuals are the very C. yunnanensis, and thus the species is not extinct. Our phylogenetic analysis also demonstrates that C. yunnanensis is not of recent hybrid origin, but rather represents a distinct evolutionary lineage.     

Societal response to challenges of global change and human sustainable development

It is now widely accepted that carbon emission from human activities is an important driving force in global warming, and global change has a deep impact on sustainable development of human society. To meet the challenges of global change, the international community has reached a consensus that developed countries take strict actions in emission reduction, whereas developing countries take spontaneous efforts in reducing emissions under the guiding principle of common but differentiated responsibilities, with an agreed goal to restrict global surface temperature increase due to human activities to within 2℃ of pre-industrial levels. However, there is no clear pathway to reach this goal. A number of related questions must be addressed on principles to be followed, research emphasis and policy measures. Here we argue that response policies to address global change issues must be based on balanced development at regional and international levels, and on advancements in science and technology. This requires consideration of harmony not only between humans and nature but also within human societies, to properly deal with the relationship between global change and sustainable development. We must make equal efforts toward carbon emission reduction and carbon sequestration, and toward mitigation and adaptation. There should be more research support to reduce uncertainties in our understanding of global change. Addressing the challenges of global change creates great opportunities for the development of human society. This will facilitate transformation of energy use structure, improve and restore ecological functioning of the earth environment, transform production modes and ways of living in human society, and promote harmonic and balanced development at regional and international levels.