全民健身计划与大学生的体育意识

大学生是全民健身计划重点实施的对象；是实施全民健身计划的先导者和传播者；加强对大学生体育意识的引导和培养，尤其加强对大学生的体育情感、体育知识和体育意志的引导和培养，是大学体育和全民健身计划实施的重要任务和首要环节．     

全数字高清晰度电视（HDTV）传输方式—16QAM

本文概述了频道兼容Ｄｉｇｉｃｉｐｈｅｒ ＨＤＴＶ（ＣＣＤＣ ＨＤＴＶ）系统中采用的传输方式１６ＱＡＭ的调制与解调原理，同时对１６ＱＡＭ的两种不同实现方法－正交调幅法和ＱＰＳＫ迭加法作了比较，说明四相迭加法是较好的方案。     

"思无邪"解析

“思无邪”本出自《诗·鲁颂·?》篇,而《论语·为政》第二则中记载孔子论诗的一句“《诗》三百,一言以蔽之,‘思无邪’。”到底指的是什么,历来说法甚多,本文试从三个方面来论述:一、“思无邪”并非《鲁颂·?》篇的本事本义,而是孔子断章取义,为我所用;二、“思无邪”体现了内容与形式的完美统一;三、“思无邪”体现了孔子的一种达观的人生境界。     

Schiff base complexes of organotin(IV): Reactions of trimethyltin hydroxide and trialkyltin ethoxides with benzothiazolines

Twenty-three new volatile trialkyltin derivatives of sulphur containing Schiff bases have been synthesized by the reactions of trimethyltin hydroxide and trialkyltin ethoxides with 2,2-disubstituted benzothiazolines. On the basis of molecular weight measurements and infrared proton magnetic resonance spectra, five coordination at tin is proposed for these complexes.     

自然分娩人工饲养获得净化小型猪尝试

目的探讨自然分娩人工饲养能否获得净化的五指山小型猪。方法母猪自然分娩后2 h内,将仔猪处理后转到隔离器,用奶粉、米粉、饲料分别过渡人工饲养。其间分别接种7次益生菌、补充铁硒制剂两次。饲养至42 d,测定其携带病原抗体。结果仔猪成活率为75%,原猪场所具有的病原均被隔离,达到净化试验目的。结论自然分娩人工饲养能获得无多种人畜共患疾病的净化五指山小型猪。     

Numerical simulation of a 4WD–4WS tractor turning in a rice field

For the steady-state circular turning of a 4WD–4WS (4 wheel driven–4 wheel steered) tractor in a rice field, a numerical simulation was achieved. Equations of motion of this tractor were developed in a vehicle fixed x–y coordinate system. By comparing the calculated and measured results of acting forces on the tractor tires, this simulation was evaluated. Then, the characteristic parameters of the turning vehicle, which are the side slip angle and the yaw angular velocity of the vehicle center of gravity, were simulated in several combinations of the steering wheel angle and the forward speed. Also the same simulation applied to a 4WD–2WS tractor which had the same body as the 4WD–4WS tractor. The simulated results showed a clear difference of turnability between 4WS and 2WS. ©     

草履虫室内长年连续培养

草履虫是动物学实验的必备材料,因为它繁殖快、易培养,所以亦是研究细胞遗传的好材料。近年来,由于自然环境不断被污染或被破坏,野外采集草履虫越来越困难。笔者研究在室内长年连续培养草履虫方法简单易学,同时,也可省去野外采集之苦     

全光网络的路由扩展方法

本文主要讨论了通信网络的路由创建方法,提出了一种使用节点的相邻关系来创建新路由的原理和操作步骤.在网络连接度满足一定要求后,可以重复用该方法来获得网络节点之间的所有可能路由.文章最后讨论了路由扩展方法在通信网络创建路由时的使用方法.     

Spin-Crossover Assisted Spin-Switching and Rectification Action in Half-Metallic Graphitic Carbon Nitride(g-C4N3)

Herein, we report on the potential multifunctional spintronic action of half-metallic graphitic carbon nitride (g-C₄N₃). We observed electrostatic spin-crossover action at an applied electric field of −0.77 V nm⁻¹, which eventually leads to spin-switching action and change in sign of bias dependent spin injection coefficient. The system also acts as a spin polarized charge current rectifier with rectification ratio of 65.41 in spin-up channel only. This electric field-controlled spin switching action and simultaneous existence of rectification action makes graphitic carbon nitride a perfect multifunctional spintronic system-an ideal material for quantum logic gate design. Results obtained have been substantiated through transmission spectra and transmission pathways analyses. An analysis of projected device density of states of the system and molecular projected self consistent Hamiltonian states analysis reveals that the electron flow of the system is mainly facilitated by 2p orbitals of C and N atoms.     

NRZ码全光帧头识别器研究

提出了一种基于太赫兹非对称光解复用器结构的NRZ码全光帧头识别方案.通过注入辅助的连续光,解决了信号在SOA中的竞争,实现三态到两态的转换.对40 Gb/s信号的数值分析表明,这种方案可获得消光比为13.29 dB的判决识别信号输出.对非线性相移差偏离的影响进行了分析,结果表明如果限制非线性相移差的偏离小于0.1 rad,仍然可获得消光比13 dB以上的判决识别信号输出.对2.5 Gb/s帧头信号的判决实验表明,理论分析结果与实验相符.