Implementation of a many-qubit Grover search by cavity QED

We explore the possibility of an N-qubit (N>3) Grover search in cavity QED, based on a fast operation of an N-qubit controlled phase-flip with atoms in resonance with the cavity mode. We demonstrate both analytically and numerically that our scheme can be achieved efficiently to find a marked state with high fidelity and high success probability. As an example, a ten-qubit Grover search is simulated specifically under the discussion of experimental feasibility and challenge. We argue that our scheme is applicable to the case involving an arbitrary number of qubits. As cavity decay is involved in our quantum trajectory treatment, we can analytically understand the implementation of a Grover search subject to dissipation, which will be very helpful for relevant experiments.     

缓释肥料的研究与进展

结合国内外２４篇参考文献综述了缓释肥料的性质、合成及应用研究方面的进展动态。     

穿透地层的矿井地下无线通信系统设计方案探析

针对穿透地层无线通信的特点,采用终端短路单级天线及单边带调制和弱信号接收技术,提出一种可行的穿透地层矿井无线电通信系统的方案。     

理想开关SPICE宏模型的设计

讨论了SPICE程序对于电流控制开关电路模拟的问题。模拟DC-DC转换器、大功率开关和大功率电路系统的关键在于找出SPICE程序能接受的代替开关元件,文章给出了建立理想开关SPICE宏模型的方法和多种电压控制开关、电流控制开关的子电路模型。该方法简便易懂,在电路系统的设计仿真中有良好的应用价值。     

Drug release from a coated planar matrix with a super-saturation loading in the core (II)

The preparation and characterization of 5-fluorouracil/ethylene-vinyl alcohol copolymer (5-Fu/E- VAL) matrix coated with various polymeric materials are reported. The coating materials studied here include ethylene-vinyl alcohol copolymer (EVAL) , cellulose acetate (CA), poly-2-hydroxyethyl methacrylate (PHEMA) and poly-methyl methacrylate (PMMA) with different diffusivities and thicknesses. To validate the proposed model equations, these coat¬ed systems were investigated experimentally and quantitatively. The results show a good correlation between theoretical predictions and experimental data.     

用可编程控制器和图形操作终端组成的卷烟厂除尘监控系统

在卷烟厂除尘控制中 ,以可编程控制器 ( PLC)为现场控制器 ,以图形操作终端作上位机 ,组成了计算机监控系统 PL C实现顺序逻辑控制和模拟量闭环控制 ,图形操作终端则进行集中显示和操作 ,还可通过上位机在线修改系统参数 ,提高了系统的自动化水平 .     

果蔬气调保鲜和冰温保鲜的实验研究

介绍了果蔬的气调保鲜和冰温保鲜原理,根据原理对减压保鲜和冰温保鲜进行了实验研究,测得了两种保鲜方式下部分果蔬的保鲜参数,最后对两种保鲜方法作了技术和经济比较,指出其优缺点.     

Grafted copolymer micelles with pH triggered charge reversibility for efficient doxorubicin delivery

The instability and premature charge reversal at pH 7.4 have become the major limitations of charge‐reversal delivery systems. To address this problem, graft copolymer of poly(butylene succinate)‐g‐cysteamine‐bi‐poly(ethylene glycol) (PBS‐g‐CS‐bi‐PEG, bi = benzoic imine bond) was designed and synthesized through facile thiol‐ene click reaction and subsequent Schiff's base reaction. Then, PBS‐g‐CS‐bi‐PEG and carboxyl‐functionalized polyester of poly(butylene succinate)‐g‐3‐mercaptopropionic acid (PBS‐g‐MPA) co‐assemble in aqueous solution to give PEG shell‐sheddable charge‐reversal micelles with sizes of 85–103 nm and low polydispersity of 0.11–0.12. Interestingly, the PBS‐g‐MPA/CS‐bi‐PEG micelles could sensitively and arbitrarily switch their surface charges between negative and positive status in response to pH fluctuation via reversible protonation and deprotonation of carboxyl and amino groups, which endows the desired stability of co‐assembly micelles either during long‐term storage or under physiological conditions. Doxorubicin (DOX) was loaded into PBS‐g‐MPA/CS‐bi‐PEG micelles with a high drug‐loading content of 10.2% and entrapment efficiency of 68% as a result of electrostatic attraction. In vitro release studies revealed that less than 25% of DOX was released within 24 h in the environment mimicking the physiological condition, whereas up to 81% of DOX was released in 24 h under weak‐acid condition resembling microenvironment in endosome/lysosome. In vitro cytotoxicity study suggested that blank PBS‐g‐MPA/CS‐bi‐PEG micelles possessed excellent biocompatibility, while DOX‐loaded PBS‐g‐MPA/CS‐bi‐PEG micelles showed significant cytotoxicity with half‐maximal inhibitory concentration (IC₅₀) of 1.55–1.67 μg DOX equiv/mL. This study provides a facile and effective approach for the preparation of novel charge‐reversal micelles with switchable charges and excellent biocompatibility, which are highly promising to be used as safe nanocarriers for efficient intracellular drug delivery. © 2017 Wiley Periodicals, Inc. J. Polym. Sci., Part A: Polym. Chem. 2017 , 55, 2036–2046     

三光气为SET-LRP引发剂制备聚甲基丙烯酸甲酯的研究

末端官能化聚合物具有重要的应用价值。本文以三光气为单电子转移活性自由基聚合（SET-LRP）的引发剂,甲基丙烯酸甲酯（MMA）与丙烯酸甲酯（MA）为单体,Cu粉为催化剂,三苯基膦作配体,制备了聚甲基丙烯酸甲酯（PMMA）和聚丙烯酸甲酯（PMA）。在优化条件下,MMA的转化率可达到64.1%。     

基于模糊调节的两轮自平衡车的终端滑模分解控制

文章针对两轮自平衡车的平衡控制问题,提出一种新型滑模控制方法。该方法首先将平衡控制系统分解为摆角子系统和位移子系统,分别设计各子系统的快速终端滑模面,利用一个具有反正切函数形式的中间变量将位移子系统的控制目标嵌入到摆角子系统的控制目标中,从而用1个控制量实现了对2个子系统的有效控制,使其在有限时间内收敛至平衡点;考虑到滑模面系数对系统状态收敛速度的影响,采用模糊推理对系数进行调节,改善了动态响应速度,且从理论上证明了滑模面的稳定性。最后,针对所提出的方法进行仿真,仿真结果验证了该控制方法的有效性。