4G通信工程技术要点及应用研究

近些年来,我国的通信行业取得了很大的进步,随着网络技术的不断发展,原有的2G、3G等技术已经无法满足人们的需求,使得通信工程的发展陷入僵局,因此,将原有通信工程各项技术进行完善成为研究人员的重点工作内容,而4G技术也应运而生,这种新的技术在速度及服务质量等方面表现的更加出色,因此具有较大的研究价值.     

人性实用高速——令人耳目一新的多功能一体机

爱普生CX9300F堪称彩色传真一体机的经典之作!其具有传真、打印、复印和扫描等多项功能；简洁易用的操作面板，45度的倾角符合人体工程学；2．5英寸超大可调整彩色LCD液晶屏，也能保证每个使用者找到适合自己使用习惯的角度。CX9300F采用爱普生精准微压电喷头工艺，搭配新一代世纪绚彩防水耐光墨，细腻流畅的打印效果可同激光打印品质媲美。特别值得一提的是，     

Species diversity in rock–paper–scissors game coupling with Levy flight

The rock–paper–scissors （RPS） game is a nice model to study the biodiversity in an ecosystem. However, in the previous studies only the nearest-neighbor interaction among the species was considered. In this paper, taking the long-range migration into account, the effects of the interplay between nearest-neighbor-interaction and long-range-interaction given by Levy flight with distance distribution lh （-3 ≤ h 〈-1） in the spatial RPS game are investigated. Taking the probability, exchange rate, and power-law exponent of Levy flight as parameters, the coexistence conditions of three species are given. The critical curves for stable coexistence of three species in the parameter space are presented. It is also found that Levy flight has interesting effects on the final spatiotemporal pattern of the system. The results reveal that the long-range-interaction given by Levy flight exhibits pronounced effects on biodiversity of the ecosystem.     

A modified weighted probabilistic cellular automaton traffic flow model

This paper modifies the weighted probabilistic cellular automaton model (Li X L, Kuang H, Song T, et al 2008 Chin. Phys. B 17 2366) which considered a diversity of traffic behaviors under real traffic situations induced by various driving characters and habits. In the new model, the effects of the velocity at the last time step and drivers' desire for acceleration are taken into account. The fundamental diagram, spatial-temporal diagram, and the time series of one-minute data are analyzed. The results show that this model reproduces synchronized flow. Finally, it simulates the on-ramp system with the proposed model. Some characteristics including the phase diagram are studied.     

高效液相色谱-串联质谱法同时测定饲料中9种霉菌毒素及其代谢物

应用高效液相色谱-串联质谱(HPLC-MS/MS)技术,建立了同时检测饲料中9种霉菌毒素及其代谢物的分析方法。样品加入NaCl经乙腈-水(85∶15)振荡提取后,用TC-M160多功能净化柱净化,氮气吹干,用1mL乙腈-水(1∶1)定容,Agilen C18色谱柱(150×2.1mm,3.5μm)分离,采用正负离子同时扫描的多反应监测模式进行检测,外标法定量。方法检出限为0.11~0.60μg/L,在2.0~100.0μg/L基质添加浓度范围内呈现良好的线性关系,相关系数r0.998。5.0~50.0μg/L加标范围内回收率为67.0%~103.5%,相对标准偏差15%。该法简便、快速、灵敏度高,符合对饲料中霉菌毒素的检测要求,可为相关检测提供技术支持。