Preparation, Characterization and Optical Properties of Host-guest Nanocomposite Material Mordenite-silver Iodide

Silver iodide nanoclusters were successfully prepared in the channels of mordenite by a heat diffusion method. Powder X ray diffraction, adsorption technique and infrared spectroscopy were used to characterize the prepared materials, which showed that the guest silver iodide had been encapsulated in the channels of mordenite. The optical properties of the solid phase diffuse reflectance absorption of nanocomposite material NaM AgI were studied, showing that the absorption bands of the diffuse reflectance absorption of the prepared material moved to the region of high energy. The absorption peak of the material prepared shifted to the region of high energy. Namely, blue shift was caused. This has demonstrated the incorporation of silver iodide into the channels of the zeolite. We observed the luminescence and surface photovoltage spectra of NaM AgI sample, proposing the mechanisms of the photoluminescence and photovoltaic responses.

GUEST VLAN技术在网络管理中的应用

目前，大型网络普遍采用认证技术，非授权用户一般无法使用网络资源。尽管这是安全管理的需要，但是在实际使用中，如果采用802．1X的认证方式，客户端软件的下发和升级的工作量将会很大，最理想的方法是能够采用用户自助方式。但是在未经过认证之前，通常接入交换机的端口是关闭的，无法访问任何资源。同时。对外单位来访用户需要访问公共资源，使用公共账号的方式也存在安全隐患。采用动态VLAN和GUEST VLAN技术就可以很好地解决这些问题。

Hotel Guest Service Technology

For any hotel guest reception technology is an important factor in the quality service process,financial-economic efficiency,and management of the hotel industry.The service process in the same type hotel is standard,meanwhile the service process technology undergoes certain alterations according to the hotel’s size,structure,category,and market segment orientation.Hotel customer service technology is characterized by cycling phases—consistent repeat of the service process before the departure of the guest from the hotel.The article discusses the four-phase cycle of guest reception,related to the hotel services and transactions.Each phase of the cycle consists of standard transactions/phases,which are carried out between hotel clients and the hotel itself.

Guest账户安全秘籍

从最初的Windows9x系统开始，来宾访问账户Guest就默默地陪伴着我们。但如果在局域网环境中贸然使用Guest账号进行网络访问，很容易给计算机系统甚至整个网络带来安全威胁。为了避免安全麻烦，不妨来探讨一些潜伏在Guest账户下的安全控制秘籍。

VMM中Guest OS非陷入系统调用指令截获与识别

针对虚拟化环境下Guest OS某些特定指令行为不会产生陷入从而在虚拟机管理器(virtual machine monitor,VMM)中无法对其进行监控处理的问题,提出通过改变非陷入指令正常运行条件,使其执行非法产生系统异常陷入VMM的思想;据此就x86架构下Guest OS中3种非陷入系统调用指令在VMM中的截获与识别进行研究:其中基于int和sysenter指令的系统调用通过使其产生通用保护(general protection,GP)错系统异常而陷入,基于syscall指令的系统调用则通过使其产生UD(undefined)未定义指令系统异常而陷入,之后VMM依据虚拟处理器上下文现场信息对其进行识别;基于Qemu&Kvm实现的原型系统表明:上述方法能成功截获并识别出Guest OS中所有3种系统调用行为,正常情况下其性能开销也在可接受的范围之内,如在unixbench的shell测试用例中,其性能开销比在1.900~2.608之间.与现有方法相比,它们都是以体系结构自身规范为基础,因此具有无需修改Guest OS、跨平台透明的优势.

Molecular dynamics simulation of structure H clathrate-hydrates of binary guest molecules

Molecular dynamics （MD） simulations are performed to study the stability of structure H clathrate-hydrates of methane＋large-molecule guest substance （LMGS） at temperatures of 270, 273, 278 and 280 K under canonical （NVT-） ensemble condition in a 3×3×3 structure H unit cell replica with 918 TIP4P water molecules. The studied LMGS are 2-methylbutane （2-MB）, 2,3-dimethylbutane （2,3-DMB）, neohexane （NH）, methylcyclohexane （MCH）, adamantane and tert-butyl methyl ether （TBME）. In the process of MD simulation, achieving equilibrium of the studied system is recognized by stability in calculated pressure for NVT-ensemble. So, for the accuracy of MD simulations, the obtained pressures are compared with the experimental phase diagrams. Therefore, the obtained equilibrium pressures by MD simulations are presented for studying the structure H clathrate-hydrates. The results show that the calculated temperature and pressure conditions by MD simulations are consistent with the experimental phase diagrams. Also, the radial distribution functions （RDFs） of host-host, host-guest and guest-guest molecules are used to analysis the characteristic configurations of the structure H clathrate-hydrate.

Guest Vlan在校园网络中的应用

伴随校园内网络的普及,安全日益成为影响校园网络效能的瓶颈,校园网络安全已经成为人们最为关注的事情。802.1x运用在校园网上,增强了网络的安全性。但在部署802.1x的时候,碰到了不少障碍。对校园网内部署802.1x存在的问题进行了研究,并根据实践介绍了一种过渡解决方案—Guest Vlan,用它可解决802.1x部署过程中遇到的问题。

动态VLAN和Guest VLAN技术在校园网中的应用

介绍了VLAN技术及其在校园网用户认证中的应用。VLAN技术为解决网络配置和管理提供了良好的方法,随着网络的不断发展,VLAN技术将得到更加广泛的应用。

Guest Editorial-Special issue on advances in mine safety science ＆ engineering

Mine safety encompasses many aspects of a mining operation,ranging from personnel and equipment safety to the safety of the environment.Mine disasters such as fires,floods,explosions,outbursts,rockbursts,ground caving,pit slope slides,and tailings dam failures,pose serious threats to the lives of mine operators,

Words from the Guest Editor-in-Chief

PSESP(Plant Species with Extremely Small Populations)is a new concept developed to rescue the most globally threatened plant species.It first appeared in'Proposal for the Extremely Small Population protection project for the endemic plants and animals of Yunnan',a report submitted to China's State Forestry Administration(SFA)through the Yunnan Forestry Department(YFD)in 2005.In September 2009,four years after the launch of the project。

The Guest Star of AD185 must have been a Supernova

The ＂guest star＂ of AD185, recorded in the ancient Chinese history the Houhanshu, has been widely regarded as a supernova. However, some authors have suggested that the guest star might have been a comet. It has also been proposed that the record is the concatenation of a nova with a comet made by an early compiler. We have checked the record of the guest star, comparing it with records of comets in the same history. We find that most descriptions of comets clearly indicate motion, whereas the record of the guest star does not. We further argue that the term ＂yan＂ used to describe the star＇s ＂size＂ might be short for yanchuang （seat bed）, and ＂half a yan＂ would be simply as an imaginary figuration of the ancient observer. Moreover, we show that the term ＂hou -year＂ （hou-nian） most probably means the year after next. We argue that the asterism Southern Gate consisted of the stars α andβ Cen. We conclude that the record describing the guest star of AD 185 is completely different from any comet record in the same history, and that it almost certainly was a supernova.

IoT-based Smart and Complex Systems：A Guest Editorial Report

THE Industrial Revolution starting from about 1760 and ending at around 1840 has been viewed as the first Industrial Revolution.It features with the replacement of human and animal muscle power with steam and mechanical power.Human income per capita had taken 800 years to double by

Highly Luminescent Host-Guest Systems Based on Zeolite L and Lanthanide Complexes

Supramolecular incorporation of lanthanide complex has been obtained by loading of organic ligand into Eu3+-exchanged zeolite L. This was achieved by a two-step procedure: (1) zeolite L was ion-exchanged with Eu(Ⅲ) ions; (2) organic ligand was then loaded into the channels of the Eu3+-exchanged zeolite by gas diffusion procedure. Loading of ligand into the channels of zeolite L was confirmed by element analysis. Luminescence spectroscopy has confirmed that lanthanide complex are formed in the nanochannels of zeolite L crystals. In addition to the sharp emissions of lanthanide ions, broad band ranged from 350～500 nm can also be observed. This study provides alternative method for fabricating full-color display materials.

Lattice dynamics study of low energy guest-host coupling in clathrate hydrate

Our lattice dynamics simulation of Xe-hydrate with four-site TIP4P oxygen-shell model can accurately reproduce each peak position in the inelastic incoherent neutron scattering spectrum at the acoustic band （below 15 meV） and yield correct relative intensity. Based on the results, the uncertain profile at ～6 meV is assigned to anharmonic guest modes coupled strongly to small cages. Blue shift is proposed in phonon dispersion sheet in the case of anticrossing and found to be an evident signal for guest-host coupling that explains the anomalous thermal conductivity of clathrate hydrate.

Host-guest interaction of β-cyclodextrin with isomeric ursolic acid and oleanolic acid:physicochemical characterization and molecular modeling study

Ursolic acid(UA) and oleanolic acid(OA) are insoluble drugs. The objective of this study was to encapsulate them into β-cyclodextrin(β-CD) and compare the solubility and intermolecular force of β-CD with the two isomeric triterpenic acids. The host-guest interaction was explored in liquid and solid state by ultraviolet-visible absorption,1H NMR, phase solubility analysis, and differential scanning calorimetry, X-ray powder diffractometry, and molecular modeling studies. Both experimental and theoretical studies revealed that β-CD formed 1: 1 water soluble inclusion complexes and the complexation process was naturally favorable. In addition, the overall results suggested that ring E with a carboxyl group of the drug was encapsulated into the hydrophobic CD nanocavity. Therefore, a clear different inclusion behavior was observed, and UA exhibited better affinity to β-CD compared with OA in various media due to little steric interference, which was beneficial to form stable inclusion complex with β-CD and increase its water solubility effectively.

Guest Editorial Special Issue on Mid-Infrared Lasers and Applications

Mid-infrared （mid-IR） lasers, generally defined as having an operation wavelength in the spectral region of 2μm to 20μm, have attracted great scientific and technological interests owing to their widespread applications. This wavelength range not only contains some strong vibration transitions of many important molecules, thus, exhibiting enormous potential in medical, spectroscopy.

Friendly enemies--Character analysis of Guests of the nation by Frank O＇Conner

The paper focuses on the four soldiers away from the battle field depicted in the short story Guests oftke nation written by Frank O＇Conner. The character analysis is achieved by the reflection of the human nature when the soldiers were temporarily living peacefully and their painful conflicts between duty as soldiers and human nature as men. Through the tragic fate of both the two executed Englishmen and the executors--two Irish men, the cruelty of the war is strongly condemned. The war mercilessly defeated the human nature cultivated through the friendship and knowing with each other.

Guest Editorial for Special Issue on Human-centered Intelligent Robots:Issues and Challenges

The special issue aims to address a broad spectrum of topics ranging from human-centered intelligent robots acting as a servant,secretary,or companion to intelligent robotic functions.The special issue publishes original papers of innovative ideas and concepts,new discoveries,and novel applications and business models relevant to the field of human-centered intelligent robots.In this special issue,modeling,intelligent control,

Guest账户无法禁用？

白山发电厂在执行国家电网公司“内网系统桌面安全策略管理”工作中，发现较多终端电脑的Windows XP操作系统中提示账户弱口令，尤其是在Windows XP Home Edition操作系统中也提示Guest账户弱口令的问题。

Guest Editorial-Special Issue on Science and Technology of Soft Rocks

Soft rocks are a critical geomaterial presenting several kinds of problems.They present undesirable behaviors such as low strength,disaggregation,high plasticity,slaking,weathering and other characteristics.These behaviors prevent their utilization or tend to avoid sites dominated by soft rocks for important engineer-