Spherical foam growth in Al alloy melt

The ultra light metal structure, realizing the light-ness and multifunction of structural material, has a bright future in high-tech and civil fields and is be-coming one of the hotspots in developed countries in 21 century[1―8]. Preparing Al foam by mel…     

Hydrothermal Synthesis of Pb_(1-1.5x)La_xZr_(0.5)Ti_(0.5)O_3 (x = 0.01-0.06) Nanocrystallites

Lanthanum doped lead zirconate titanate (PLZT) ceramics display excellent electrooptic and photostriction properties because of the existence of cavities in the perovskite structure1-3. The PLZT powders are conventionally prepared by solid state reaction4-5, and the wet chemical methods such as sol-gel techniques are then introduced6-7. However, the homogeneity, morphology and size of the particles, which greatly affect the sinterability and the property of the resulting ceramics, are dif…     

Theoretical Study on Intramolecular Proton Transfer of Perylenequinonoid Derivatives

In the past two decades, perylenequinonoid derivatives (PQD), such as hypocrellin A (HA), hypocrellin B (HB) and hypericin (HYP) have attracted considerable attention owing to their excellent properties of photosensitization and great advantages over the investigation of intramolecular proton transfer (IPT)1-5. Previous researches demonstrated that IPT both in the ground state and excited states exists in PQD and is critical for PQD to reserve their photosensitive activity3,6. Altho…     

Design,synthesis and antifungal activities in vitro of novel tetralin compounds

Novel chiral tetralin compounds were designed and synthesized, and their antifungal activities in vitro were tested. The results showed that all of target compounds had potent antifungal activities, and were stronger than that of control compounds tetrahydroisoquinolines. The binding model of lead molecules in the active site of CYP51 of Candida albicans showed that lead compound specifically interacted with the amino acids residues in the active site, without binding with the heme of CYP51, which was different from azole antifungal drugs. The present study might afford a novel lead molecule to develop non-azole CYP51 inhihitars of fungi.     

(1+1)维非局域非线性介质的边界对表面孤子的影响

对非局域非线性介质中, (1+1)维表面亮孤子进行了研究, 主要考虑了边界对孤子的影响. 首先, 在归一化系统中, 对于给定的边界条件, 求出了表面孤子的解析解, 得到了表面孤子的临界功率和平衡位置. 其次, 在数值模拟中, 发现当样品宽度太小时, 受到边界影响而很难形成表面孤子, 只有当样品宽度足够大时, 边界对孤子的影响可以忽略, 从而形成稳定传输的孤子, 并与解析的结果相似. 此外, 还考虑了在光束偏离平衡位置入射的情况下, 边界对孤子的影响, 发现此时光束在边界附近做周期性震荡, 相当于体介质中双光束相互作用的结果, 两者运动轨迹与震荡周期完全符合. 关键词： 非局域非线性 边界 样品宽度 周期震荡     

Li3V2(PO4)3/C的P123辅助流变相法制备及电化学性能

以V₂O₅、NH₄H₂PO₄、LiOH、柠檬酸、三嵌段聚合物表面活性剂P123为原料, 用流变相(RPR)法制备了Li₃V₂(PO₄)₃/C正极材料. 用X射线衍射(XRD)、扫描电镜(SEM)、透射电镜(TEM)等方法表征, 结果表明: 材料为单一纯相的单斜晶体结构, 颗粒均匀并呈现珊瑚结构; 恒流充放电, 循环伏安(CV)及电化学交流阻抗(EIS)等电化学性能测试表明, 采用P123 辅助合成材料电化学性能明显优于未采用P123 辅助合成材料. 3.0-4.3 V放电区间, 0.1C充放电下P123 辅助合成Li₃V₂(PO₄)₃/C材料首次放电比容量为129.8 mAh·g^-1, 经过50 次循环后容量只衰减0.9%; 倍率性能及循环性能优异, 1C、10C、25C的首次放电比容量分别为128.2、121.3、109.1 mAh·g^-1, 50次循环后容量保持率分别为99.1%, 96.9%, 90.7%. 这归因于三嵌段聚合物P123 作为分散剂的同时也作为有机碳源在颗粒表面及间隙形成碳网络, 有利于材料导电率的改善, 降低了其电荷转移阻抗, 减小了电极充放电过程的极化现象.     

Synthesis and Crystal Structure of Monochloridehepta(dimethyl sulfoxide)gadolinium(Ⅲ) di(tetraphenyl boron) Salt 〔Gd(dmso)_7Cl〕〔BPh_4〕_2

１　ＩＮＴＲＯＤＵＣＴＩＯＮＳｕｌｆｏｘｉｄｅｉｓｋｎｏｗｎｔｏｆｏｒｍｃｏｏｒｄｉｎａｔｉｏｎｃｏｍｐｏｕｎｄｓｗｉｔｈＬａｎｔｈａｎｉｄｅ（Ⅲ）ａｎｄｔｈｅｉｒｓｙｎｔｈｅｓｅｓ,ｐｒｏｐｅｒｔｉｅｓａｎｄｖａｒｉｏｕｓｐｈｙｓｉｃａｌｃｈａｒａｃｔｅｒｉｓｔｉｃｓｈａｖｅｂｅｅｎｒｅｐｏｒｔ－ｅｄ〔１～９〕．Ｈｏｗｅｖｅｒ,ｔｈｅｒｅａｒｅｓｏｍａｎｙｄｉｆｆｉｃｕｌｔｙｉｎｐｒｅｐａｒｉｎｇｔｈｅｋｉｎｄｏｆｌａｎｔｈａｎｉｄｅｃｏｍｐｌｅｘｅｓｂｅｃａｕｓｅｔｈｅａｎｉｏｎｓｕｓｅｄａ…     

A Novel Hexanordammarane Glycoside from the Roots of Panax notoginseng

There are extensive chemical studies on the roots of Panax notoginseng (Burk.) F. H. Chen, a famous traditional Chinese medicine called San-Qi or Tian-Qi, thirty-three dammarane saponins were isolated and their structures were identified by our group and other scientists1-8. Further chemical investigation on this plant led to the isolation of a novel hexanordammarane glycoside, named notoginsenoside R10 (1).Notoginsenoside R10 (1), white powder, negative HRFAB-MS showed a quasimolecular…     

In Vitro Interaction of Nicotine and Hemoglobin under Liver Cell Metabolizing Condition

Nicotine, 3-(1-methyl-2-pyrrolidinyl)pyridine, the main alkaloid in tobacco products, has been well known for its addiction effect. Habitual smokers are usually maintaining nicotine concentration constant in their blood at about 10-15 ng/mL1. Therefore the interaction of nicotine and hemoglobin (Hb) is essential to be studied. Our recent study by accelerator mass spectrometry (AMS) has shown that nicotine could form adducts with Hb after in vivo administration, and there is a positive dose r…