Novel Alkaloids from Stemona sessilifolia

Two new alkaloids, sessilifolines A ( 1 ) and B ( 2a ), were isolated from the stems of Stemona sessilifolia, together with three known alkaloids, tuberstemonine ( 3 ), sessilifoliamide A ( 4 ), and stemoninoamide ( 5 ). Their structures were established by mass‐spectrometric and spectroscopic methods, especially 2D‐NMR techniques.     

Application of tin and nanometer tin in allylation of carbonyl compounds in tap water

[reaction: see text] Nanometer tin-mediated allylation of aldehydes or ketones in distilled or tap water gave rise to corresponding homoallyl alcohol in high yield without any other assistance such as heat or supersonic or acidic media.     

S2BrH的构型及其异构化反应的理论研究

由于在合成化学、大气化学和环境保护中的重要性，过硫化物XSSX(X=H，CH3，F，Cl等)被广泛研究。本文采用量子化学的密度泛函方法(DFT)，对S2BrH可能存在的2种构型的几何结构、相对稳定性以及可能的分子内原子迁移过程进行研究，探讨分叉型异构体SSBrH存在的可能性。     

稀土含量对快淬(Nd,Pr)x(FeCoZr)94-xB6粘结磁体磁性能的影响

采用工艺参数范围较宽的部分过快淬加晶化退火工艺，制备了快淬(Nd0．8Pr0.2)x(FeCoZr)94-xB6(x=12．0，10．5，10．0，9．0)粘结磁体，研究了稀土含量对磁体磁性能的影响规律。部分过快淬获得的由非晶和微晶共同组成的条屑，在实验优化的退火条件下晶化处理后，可获得最佳磁性能。稀土含量直接决定磁体的磁性能，随稀土含量的减少，磁体的剩磁Br增加，而内禀矫顽力Hti和最大磁能积(BH)m下降，10％是磁体磁性能发生较大变化的临界稀土含量。低于这一含量，合金中软磁相体积分数超出软磁相被完全耦合的临界值，Br增加缓慢，Hci和(BH)m迅速下降。这一实验结果与本文提出的完全耦合软磁相体积分数示意模型的计算结果相一致。     

碳载CuTAPP的ESR研究(Ⅱ)

本文利用ESR技术详细研究了室温至150℃范围内CuTAPP在碳表面的行为。提出了铜卟啉在碳表面吸附水膜中的二维扩散机理。对较高温度处理后铜卟啉的ESR也作了简要报道。     

Tripartite Quantum Controlled Teleportation via Seven-Qubit Cluster State

In this paper, a theoretical scheme for tripartite quantum controlled teleportation is presented using the entanglement property of seven-qubit cluster state. This means that Alice wants to transmit a entangled state of particle a to Bob, Charlie wants to transmit a entangled state of particle b to David and Edison wants to transmit a entangled state of particle c to Ford via the control of the supervisor. In the end, we compared the aspects of quantum resource consumption, operation complexity, classical resource consumption, quantum information bits transmitted, success probability and efficiency with other schemes.     

Lead‐Free,Blue Emitting Bismuth Halide Perovskite Quantum Dots

Lead halide perovskite quantum dots (QDs) are promising candidates for future lighting applications, due to their high quantum yield, narrow full width at half maximum (FWHM), and wide color gamut. However, the toxicity of lead represents a potential obstacle to their utilization. Although tin(II) has been used to replace lead in films and QDs, the high intrinsic defect density and oxidation vulnerability typically leads to unsatisfactory material properties. Bismuth, with much lower toxicity than lead, is promising to constitute lead‐free perovskite materials because Bi³⁺ is isoelectronic to Pb²⁺ and more stable than Sn²⁺. Herein we report, for the first time, the synthesis and optical characterization of MA₃Bi₂Br₉ perovskite QDs with photoluminescence quantum yield (PLQY) up to 12 %, which is much higher than Sn‐based perovskite nanocrystals. Furthermore, the photoluminescence (PL) peaks of MA₃Bi₂X₉ QDs could be easily tuned from 360 to 540 nm through anion exchange.     

Enzyme‐free Glucose Sensor Fabricated by Nanorods Decorated Nanopore Arrays on Biomedical Stainless Steel

A novel enzyme‐free glucose sensor was proposed by preparation of nanorods decorated nanopore arrays (NRs/NPAs) on 316L stainless steel simply by electrochemical treatments. The NRs/NPAs sensor displays two linear ranges towards glucose determination, one range from 1 μM to 1.2 mM with a sensitivity of 202.2 μA ? cm^?2 ? mM^?1, another range from 1.2 mM to 7.7 mM with a sensitivity of 59.18 μA?cm^?2 ? mM^?1. The detection limit is 0.5 μM. The NRs/NPAs electrode exhibits excellent stability, good selectivity and reproducibility, rendering it suitable for glucose monitoring.     

Comment on“Teleportation Protocol of Three-Qubit State Using Four-Qubit Quantum Channels”

Recently, Choudhury (Int. J. Theor. Phys. 10, 1007 2016), proposed a teleportation protocol of three-qubit state using four-qubit quantum channels.According to their scheme the three-qubit entangled states could be teleported by use of three simultaneous quantum channels of four-qubit cluster states. In this paper,we emphasize that the same three-qubit entangled states can be teleported perfectly by using only one quantum channel of four-qubit cluster states.