无编码的

Performance simulation of the proposed estimator including Mean Squares Error of channel and uncoded Bit Error Rate have been taken, and the results show the estimator is efficient and very flexible.

对信道盲估计的均方误差和由此算法获得的信道的状态信息对无编码的OFDM系统进行解调的误比特率进行了仿真，结果表明提出的算法是有效的并具有很好的灵活性。

Hairy roots were induced from tobacco leaves with Agrobacterium rhizogenes LBA1334 harboring agropin type PRil855 and binary vector PIG121HM carrying a kanamycin resistant gene nptll and GUS gene and the good hairy root clones were selected. The root with many root hairs and branches grew vigorously toward all the direction on MS medium without plant hormone and on kanamyain containing medium (km:30mg/L). The structure of the hairy root tip is different from that of ordinary root. Witch was not typical root cap maybe the main cause of losing the geotropism of hairy root. Plantlet regenerated from hairy root when cultured on Ms medium without plant hormone. The nicotine content of the hairy root was little higher than that in the natural roots.

本研究通过发根农杆菌工程菌LBA1334(含有野生型pRi1855质粒和pIG121HM双元载体质粒，编码NPTⅡ基因和GUS基因)转化烟草沙姆逊，获得了具有卡那霉素抗性烟草发状根，并筛选出良好的单克隆株系，该发状根具有典型的发状根特性(多根毛、多分支、在无激素培养基上快速生长)，通过根尖压片分析，烟草发状根不具备典型的根冠；发状根中烟碱含量1.61％稍高于与天然栽培品种母体根的含量(1.5％左右)，发状根向培养液中释放烟碱，释放量最多时占总烟碱量的81.1％；在无激素的培养基上获得了再生植株。

This paper describes the basic principle of dictionary encoding and Huffman encoding which are widely used in losslesscompression.

本文从字典编码和霍夫曼编码的基本原理出发，分析了二者在目前比较常用的无失真压缩编码技术中的应用，重点介绍了具有代表性的LZSS算法与霍夫曼编码的综合应用，并概述了其译码实现过程。

Digital Mapping the future of software development should be a non-point number, no e-plate encoding mirror site mapping system.

今后数字化测图软件的发展方向应该是一种无点号、无编码的镜站电子平板测图系统。

Firstly , we introduce the basic theory of the coding and decoding of the channel which describe the possibility of the errorless transmission in the channel existing interference .

首先从信道编码的基本定理入手论述了在有干扰存在的信道上进行无差错传输的可能性，这是纠错编码研究的理论依据与努力方向。

During encoding, the right amygdala and right pulvinar were activated when subjects unconsciously encoded fearful faces (vs. neutral faces).

在编码阶段，与中性面孔相比，恐惧面孔在无意识编码的被试中激活了右侧杏仁核和右侧枕核；而在有意识编码的被试中激活了左侧杏仁核。

An efficient Sphere Decoding algorithm is proposed for uncoded Multi-Input Multi-Output systems with a large number of antennas and higher modulation constellations. This method utilizes a channel-based group detection strategy.

摘要该文针对无编码的多输入多输出无线通信系统中的最大似然检测接收机在发端天线数较多、调制阶数较高时计算复杂度过高的问题，提出了一种低复杂度的球形译码算法。

But for different specialties people gave different models for secure network coding. For instance, J P Vilela introduced light weight secure network coding, and K Bhattad introduced weakly secure network coding. When considering the practical secure network, we must think over the network coding that resists active attack, that is to say resists Byzantine attack. In this paper we also introduce such kind of network coding.

蔡宁和杨伟豪首先针对单信源有向无圈网络给出了安全网络编码的定义和模型，其他研究者也各自提出了不同的安全模型，如J P Vilela提出了轻量级安全的网络编码，K Bhattad提出了弱安全的网络编码等，另外还有抗拜占庭攻击的网络编码。

In speech communication, almost half of the time is the silence state, which contains much redundant information need to be taken away to improve code efficiency, so the silence frame should be compressed; On the other hand, to satisfy people's listening feelings, speech code implemented on UWB would be a new future's research direction on speech code. Nowadays the compression on narrow band or wideband have been studied a lot, but the silence compression on UWB need to be studied more, which is the main job of this paper.

在语音通信中，平均一半的时间处于无语音的空闲状态，这里蕴含着大量的冗余信息，所以去掉这些冗余信息将会大幅度的提高语音编码的传输效率，这就需要对静音信号进行压缩；此外，为了满足人们听觉享受，在高带上实现语音编码也将成为未来的研究方向，现如今窄带和宽带的静音压缩技术已经较为成熟，但高带的静音压缩技术尚待发展，这也正是本文研究的必要性。

Based on the oversampling of OFDM frequency response, this paper proposes a method called LS+LPF.

利用在OFDM系统中信道的频域响应是过采样的特性，提出了LS+低通滤波器的方法，将其与带低通滤波器的sisin(x/x插值法、cubic插值法和Winner插值法进行了信道估计的均方误差和无编码的误比特率的仿真结果进行了比较。

The absorption and distribution of chromium were studied in ryeusing nutrient culture technique and pot experiment.

采用不同浓度K2CrO4(0，0.4，0.8和1.2 mmol/L)的Hoagland营养液处理黑麦幼苗，测定铬在黑麦体内的亚细胞分布、铬化学形态及不同部位的积累。

By analyzing theory foundation of mathematical morphology in the digital image processing, researching morphology arithmetic of the binary Image, discussing two basic forms for the least structure element: dilation and erosion.

通过分析数学形态学在图像中的理论基础，研究二值图像的形态分析算法，探讨最小结构元素的两种基本形态：膨胀和腐蚀；分析了数学形态学复杂算法的基本原理，把数学形态学的部分并行处理理念引入到家实际应用中。