The study of green laser performances by using composite crystals of different initial transmissions

This paper reported a passively Q-switched green laser of LD pumped linear cavity structure by using Nd:YAG/Cr⁴⁺:YAG composite crystal and the type II phase matching KTP crystal. The dependence of average output power, pulse width and pulse repetition rate on pump power at different initial transmissions of Cr⁴⁺:YAG were measured and analyzed. With Cr⁴⁺:YAG of 80% initial transmission, under pump power of 13.97 W, the output average power is up to 681 mW, with pulse width of 200 ns and pulse repetition rate of 9.1 kHz. The laser operates in a fundamental mode.     

Density functional theory study of Ir atom deposited on γ-Al2O3 (001) surface

Iridium adsorption on γ-Al₂O₃ (001) surface has been studied using the ab initio calculation method and the electronic structures of the bare and the Ir adsorbed γ-Al₂O₃ (001) surfaces have been analyzed. By modeling different adsorption sites, one can conclude that the energetically most favorable sites for the Ir are the top sites of the O atoms at the γ-Al₂O₃ (001) surface terminated with octahedral Al. Charge redistribution around the Ir atom adsorbed on the surface improves the activity of the Ir atom as a catalyst.     

Amber Extract Reduces Lipid Content in Mature 3T3-L1 Adipocytes by Activating the Lipolysis Pathway

Amber—the fossilized resin of trees—is rich in terpenoids and rosin acids. The physiological effects, such as antipyretic, sedative, and anti-inflammatory, were used in traditional medicine. This study aims to clarify the physiological effects of amber extract on lipid metabolism in mouse 3T3-L1 cells. Mature adipocytes are used to evaluate the effect of amber extract on lipolysis by measuring the triglyceride content, glucose uptake, glycerol release, and lipolysis-related gene expression. Our results show that the amount of triacylglycerol, which is stored in lipid droplets in mature adipocytes, decreases following 96 h of treatment with different concentrations of amber extract. Amber extract treatment also decreases glucose uptake and increases the release of glycerol from the cells. Moreover, amber extract increases the expression of lipolysis-related genes encoding perilipin and hormone-sensitive lipase (HSL) and promotes the activity of HSL (by increasing HSL phosphorylation). Amber extract treatment also regulates the expression of other adipocytokines in mature adipocytes, such as adiponectin and leptin. Overall, our results indicate that amber extract increases the expression of lipolysis-related genes to induce lipolysis in 3T3-L1 cells, highlighting its potential for treating various obesity-related diseases.     

香豆素并咔唑基草酸酯类UV-LED可激发光引发剂的合成与研究

本文设计并制备了以香豆素并咔唑为共轭结构的草酸酯类光引发剂（2-OAME和4-OAME）,分子中大π-共轭结构的引入实现了分子在LED光域的良好吸收。通过核磁共振谱对目标产物进行了结构验证,通过紫外-可见吸收光谱、荧光光谱和理论计算对分子的光化学及光物理性质进行了表征。研究表明,两个光引发剂在近紫外-可见光范围内均表现出优异的光吸收性质,并且在LED光源激发下具有良好的光引发聚合能力,4-OAME分子较2-OAME在同样的条件下表现出更好的光引发聚合能力,在近紫外-可见LED光聚合领域具有较大的应用潜力。     

芯片表面的冷极性分子静电阱与微阱阵列

提出一种利用三根载荷金属杆来实现在芯片表面陷俘冷极性分子的静电阱.给出空间静电场等高线分布.通过调节电极电压操控阱中心距离芯片表面的高度.用经典的蒙特卡罗方法模拟冷分子被装载和囚禁的动力学过程.方案对中心速度为11 m·s^-1的冷分子束,最大装载效率可以达到40%,阱中分子的温度大约为25 mK.方案可以进一步微型化、集成化,形成一维和二维静电微阱阵列,在量子计算、低维物理等方面有应用价值.     

An Improved Chinese String Comparator for Bloom Filter Based Privacy-Preserving Record Linkage

With the development of information technology, it has become a popular topic to share data from multiple sources without privacy disclosure problems. Privacy-preserving record linkage (PPRL) can link the data that truly matches and does not disclose personal information. In the existing studies, the techniques of PPRL have mostly been studied based on the alphabetic language, which is much different from the Chinese language environment. In this paper, Chinese characters (identification fields in record pairs) are encoded into strings composed of letters and numbers by using the SoundShape code according to their shapes and pronunciations. Then, the SoundShape codes are encrypted by Bloom filter, and the similarity of encrypted fields is calculated by Dice similarity. In this method, the false positive rate of Bloom filter and different proportions of sound code and shape code are considered. Finally, we performed the above methods on the synthetic datasets, and compared the precision, recall, F1-score and computational time with different values of false positive rate and proportion. The results showed that our method for PPRL in Chinese language environment improved the quality of the classification results and outperformed others with a relatively low additional cost of computation.     

Preparation of Cerium Dioxide Functionalized Magnetic Layered Double Hydroxides for High-efficiency Phosphopeptide Enrichment

In this work, we prepared a material with magnetic nanoparticles (Fe₃O₄) as core, layered double hydroxides(LDHs) as affinity shell, and cerium dioxide(CeO₂) as functional molecules(denoted as Fe₃O₄@LDH-CeO₂). On the basis of combined immobilized metal ion affinity chromatography(IMAC) and metal oxide affinity chromatography(MOAC), Fe₃O₄@LDH-CeO₂ was used to enrich phosphopeptides with high efficiency. The material exhibited high selectivity(α-casein:β-casein:BSA=1:1:5000, mass ratio), high recovery(95.87%), and good reusability of 10 times adsorption- desorption experiments. The feasibility of Fe₃O₄@LDH-CeO₂ was further investigated by extracting phosphopeptides from biological samples(nonfat milk, serum, saliva, and A549 cell lysate).     

Paired Oxidative and Reductive Catalysis: Breaking the Potential Barrier of Electrochemical C(sp3)−H Alkenylation**

Due to the intrinsic inertness of alkanes, strong oxidative conditions are typically required to enable their C(sp³)−H functionalization. Herein, a paired electrocatalysis strategy was developed by integrating oxidative catalysis with reductive catalysis in one cell without interference, in which earth-abundant iron and nickel are employed as the anodic and cathodic catalysts, respectively. This approach lowers the previously high oxidation potential required for alkane activation, enabling electrochemical alkane functionalization at the ultra-low oxidation potential of ≈0.25 V vs. Ag/AgCl under mild conditions. Structurally diverse alkenes, including challenging all-carbon tetrasubstituted olefins, can be accessed using readily available alkenyl electrophiles.