Enantiomeric Discrimination by Surface‐Enhanced Raman Scattering–Chiral Anisotropy of Chiral Nanostructured Gold Films

A surface‐enhanced Raman scattering‐chiral anisotropy (SERS‐ChA) effect is reported that combines chiral discrimination and surface Raman scattering enhancement on chiral nanostructured Au films (CNAFs) equipped in the normal Raman scattering Spectrometer. The CNAFs provided remarkably higher enhancement factors of Raman scattering (EFs) for particular enantiomers, and the SERS intensity was proportional to the enantiomeric excesses (ee) values. Except for molecules with mesomeric species, all of the tested enantiomers exhibited high SERS‐ChA asymmetry factors (g), ranging between 1.34 and 1.99 regardless of polarities, sizes, chromophores, concentrations and ee. The effect might be attributed to selective resonance coupling between the induced electric and magnetic dipoles associated with enantiomers and chiral plasmonic modes of CNAFs.     

Flexible for Multiple Equations about GHZ States and a Prototype Case

According to the peculiar entanglement and measurement properties of the three-particle GHZ state, we have systematically analyzed that two GHZ states and three GHZ states satisfy some expressions after exchanging one or two groups of particles respectively, which are described as four interesting and flexible equations. The four equations can deduce that four GHZ states or even m GHZ states still satisfy some expressions after exchanging one group and two groups of particles, and they can be summarized as two general flexible equations. Furthermore, we also investigate their application in the field of quantum key agreement based on these equations. In particular, we combine with decoy photons to propose a novel session key sharing protocol, which can guarantee the unconditional security of the protocol. It is feasible to use the existing quantum processing technology to realize the proposed protocol.

     

Multi-Party Quantum Key Distribution Protocol with New Bell States Encoding Mode

International Journal of Theoretical Physics - Security, efficiency and universality are the major concerns in distributed computation for how to communicate securely as there are a large number of...     

Enantiomeric Discrimination by Surface-Enhanced Raman Scattering–Chiral Anisotropy of Chiral Nanostructured Gold Films

A surface-enhanced Raman scattering-chiral anisotropy (SERS-ChA) effect is reported that combines chiral discrimination and surface Raman scattering enhancement on chiral nanostructured Au films (CNAFs) equipped in the normal Raman scattering Spectrometer. The CNAFs provided remarkably higher enhancement factors of Raman scattering (EFs) for particular enantiomers, and the SERS intensity was proportional to the enantiomeric excesses (ee) values. Except for molecules with mesomeric species, all of the tested enantiomers exhibited high SERS-ChA asymmetry factors (g), ranging between 1.34 and 1.99 regardless of polarities, sizes, chromophores, concentrations and ee. The effect might be attributed to selective resonance coupling between the induced electric and magnetic dipoles associated with enantiomers and chiral plasmonic modes of CNAFs.     

电控EGR阀综合性能测试系统的研制

电控EGR阀是废气再循环技术中重要部件,主要包括步进电机式、电磁式和直流电机式,目前针对电控EGR阀测试系统研究尚不充分。为了实现对电控EGR阀各项技术指标的测试,研制了一套电控EGR阀综合性能测试系统。系统由驱动单元、控制单元、测试单元组成。驱动单元以电控EGR阀驱动器为驱动核心,控制单元以可编程控制器为控制核心,测试单元由各项指标的测试模块组成。通过对各项技术指标测试工艺流程设计,系统实现了对电控EGR阀流量特性、内漏性能、响应时间和阀内位置感应器性能的自动测试。实验结果表明,该系统稳定可靠,各项参数的机器能力指数Cmk均超过1.67,满足技术要求。系统提供了一种针对电控EGR阀综合性能的测试方案,并成功应用于某企业电控EGR阀生产测试车间。     

钢中稀土对表面渗碳的促进作用

研究了不含稀土与含同量稀土的２０钢经过气体渗碳后的渗层厚度及试件从表层向内部的变化。发现在相同的渗碳条件下,含稀土的２０钢比不含稀土的２０钢渗碳层厚度显著增加,并且随稀土含量由０－０．０３２％而不断增加。     

Photoluminescence of carbon quantum dots: coarsely adjusted by quantum confinement effects and finely by surface trap states

Photoluminescence (PL) mechanism of carbon quantum dots (CQDs) remains controversial up to now even though a lot of approaches have been made. In order to do that, herein a PL color ladder from blue to near infrared of CQDs with the absolute quantum yields higher than 70% were prepared via a one-pot hydrothermal synthesis route and separated by silica gel column. Time-correlated single photon counting measurements suggest that the electron transition takes in effect in the PL progress of the crystalline core-shell structured CQDs, and the PL properties could be coarsely adjusted by tuning the size of the crystalline carbon core owing to quantum confinement effects, and finely adjusted by changing the surface functional groups consisted shell owing to surface trap states, respectively. Both coarse and fine adjustments of PL, as optical and photoelectrical characterizations and density-functional theory (DFT) calculations have demonstrated, make it possible for top-level design and precise synthesis of new CQDs with specific optical properties.     

Microchip electrophoresis of N-glycans on serpentine separation channels with asymmetrically tapered turns

We designed and fabricated microfluidic devices with serpentine separation channels and asymmetrically tapered turns, thus allowing high efficiency separations and minimizing band broadening associated with the “racetrack” effect. We evaluated the performance of these devices by measuring the variation in separation efficiency with separation length, electric field strength, taper ratio of the turns, and number of turns. N‐Glycans derived from ribonuclease B and labeled with 8‐aminopyrene‐1,3,6‐trisulfonic acid were electrophoretically separated on serpentine channels with separation lengths of 11, 18, 22, and 36 cm at electric field strengths from 750 to 1750 V/cm. Separations on the 36‐cm channel produced plate numbers up to 940 000 with an analysis time under 3.1 min, whereas separations on the 22‐cm channel had a shorter analysis time (less than 1.25 min), still with respectable efficiencies (up to 600 000 plates). Turn‐induced dispersion was minimized with taper ratios 2 and 3, whereas having two or four 180° turns along with the separation length did not impact the overall efficiency. The developed device was used to analyze native and desialylated N‐glycans derived from the blood serum of an ovarian cancer patient and a disease‐free individual. Separation efficiencies similar to that achieved with the model glycans from ribonuclease B were attained for these biological samples.     

Multi-Party Quantum Key Agreement Protocol for Smart Home Environment

The most typical case of applying technology and communication technology to life may be the popular smart home series. Users can remotely control smart devices through mobile phones, which is convenient and fast, greatly changing people’s way of life. However, the safe login of smart devices has become a thorny problem. With the emergence of quantum computer, the common encryption method cannot prevent quantum attacks. In addition, a family often has multiple smart devices and multiple family members. Each user can log in to multiple smart devices, and each device can also be logged in by multiple users. Therefore, in view of the above situation, we propose a multi-party quantum session key agreement protocol based on Bell states and single particles, which can be used for multiple participants to negotiate session keys together, and improve the efficiency of users logging in and using smart devices. Moreover, our protocol ensures that each party has an equal opportunity to decide the final shared key, no party can determine the final key individually. Furthermore, security and efficiency analysis show that our protocol can achieve ideal results under the existing quantum technology.

     

Quantum Sealed-Bid Vickrey Auction Protocol with Semi-Quantum Bidders

In this paper, a quantum sealed-bid protocol based on semi-quantum bidders is proposed. The protocol uses Bell states to encrypt message and realizes the process that bidders can directly transmit bidding information to the auction center safely. Its essence is a semi-quantum secure direct communication protocol using Bell states. Unlike most similar protocols, our scheme eliminates the trusted third-party Trent and sets the auction center Charlie as completely honest. Considering that the auction involves human activities, too many quantum servers are not only costly, but also unrealistic. Therefore, we set the bidders as semi-quantum users and implement the Vickrey auction. In addition, the security analysis shows that our scheme has high security and is completely feasible.