特征

Detecting benzene,propyl benzene and decane helps making diagnosis of lung cancer.

在由ct图像显示的并被随后的病理结果证实的肺癌患者中，利用气相色谱系统初步研究了其呼吸特征气体苯、丙基苯和癸烷，探测这些特征气体可为初筛肺癌提供参考。

Results 7 lung cancer patients were detected three marker VOCs in their breath: Benzene,Propyl benzene and Decane.

使用TEDLAR气袋收集此8例患者的呼吸气体，然后使用固相微萃取－气相色谱对呼吸气体进行分析，根据其出峰时间的不同对VOCs定性，测得患肺癌的患者的呼吸气体中含有苯、丙基苯和癸烷三种特征性气体，而炎症患者的呼吸气体中则没有出现这样的特征性气体。

Data sample pretreatment of decision tree and Support Vector Machine method is conducted by the documents of product design knowledge segmentation processing, feature extraction, feature merger and expression vector.

通过对产品设计知识文档的分词处理、特征抽取、特征合并及向量表达，为决策支持向量机方法提(来源：d6f5A6fBC论文网www.abclunwen.com)供样本数据预处理。

From an angle of engineering application, this paper dealt with the wavelet packets decomposition principle and its energy spectrum monitoring theory, which were used to extract the features of drilling force signals. Meanwhile, with an aim at the strong randomization and uncertainty characteristics between the feature vectors and drill wears in drilling process, a kind of drill wear monitoring method based on Hidden Markov Model was presented.

从工程应用的角度论述了小波包分解原理及其能量谱监测理论，并将该理论应用于钻削力信号特征提取中，针对钻削过程特征矢量与钻头磨损之间具有较强的随机性和不确定性的特点，提出一种基于隐马尔可夫模型的钻头磨损监测方法。

Transformation from surface feature to process feature of deep-drawn parts was discussed.

通过人工智能技术建立起基于特征的工艺设计知识库，使特征技术能应用于拉深类零件的工艺设计中。

This paper applies the entropy concept of information theory to feature selection,and defines two information measurements overlap entropy and error entropy that are used to evaluate features.Then the physical meanings of the two definiens are explained.The crucial problem about how to divide the interzones is provided in the following.

将信息论中熵的概念应用到特征选择中，定义了两种信息测度评价特征——误差熵和混叠熵，然后阐述了两种定义的不用物理意义，分析了计算熵中最关键的区间划分问题，并提出一种较好的区间划分方法。

Secondly, describle the definiens and layout of domestic airport, analyse actuality or airport especially the finance character, indicate the character and deficiency of air strategic cost management, bring forward the air strategic cost management frame chart, including the value acticity, the overall arrangement,raise money to construction and mangement as well as benefit base value factor,and so on.

其次对国内机场的定义和规划以及国外机场发展的概况进行描述，对国内机场战略成本管理进行全面分析，指出机场战略成本管理的特点和表现为财务特征的方式，对机场的财务特征进行重点分析，提出包含机场基本价值活动、内部价值链的规划布局、筹资建设、运营管理三环节及其业务受益基础、筹资渠道等价值因素和行业价值链的机场战略成本管理价值链图。

Light output analysis tests character of spectrum radiate of pyrotechnic mixtures and analyses wave band distribute of light by comparing different static blaze spectrograms of the pyrotechnic mixtures. Screen out the better pyrotechnic mixtures according to request of pumping source. Press experiments in airtight erupt container experiment, which simulate the circumstance that pyrotechnic mixtures deflagrate in quartz pipe, realize the press influence to the quartz pipe wall and the disciplinarian of axes press variety. Apply these pyrotechnic mixtures to Nd:YAG lasers as the pumping source and compare pumping efficiency of different pyrotechnic mixtures. Pumping efficiency is an important standard which checkout if these pyrotechnic mixtures are the better pumping source. Sensitivity experiment analysis incarnate security of pyrotechnic mixtures that is the essential parameter in the process of design, manufacture and use.

通过对烟火药的热分析(爆热分析、DTA、TG)，了解备选烟火药反应过程中的能量输出特性及反应过程中的物理、化学变化规律；光输出分析实验对烟火药配方光谱辐射特征进行测试，比较其静态火焰光谱图，分析不同烟火药剂光辐射波段分布特征，根据激光泵浦源的辐射要求，进而筛选更符合激光泵浦源药剂要求的烟火药；模拟烟火药在石英管中爆燃环境的密闭爆发器压力分析实验反映了烟火药在石英管中反应时对管壁的压力影响以及管内轴向压力变化规律；将烟火药作为泵浦源应用于Nd：YAG固体激光器，比较不同烟火药的泵浦效率，作为检验烟火药是否适合作为激光泵浦源的重要标准；感度实验分析体现了各种烟火药的安全性，是烟火药设计、制造和使用的必要示性数。

This paper introduces the basic theory to develop coalbed methane reservoir. It compares coalbed methane reservoir with conventional natural gas reservoir on geology and production characteristics, and explains the storage and migration mechanism in detail. And it also provides a set of new integrated mathematics, numerical model for the simulation of degasification process from coalbed seams. At last, it presents a significant computer software corresponding with the model.

为此，本文从煤层甲烷的开发基础入手，对煤层气藏与常规天然气藏储集特征和开采特征进行了综合对比分析研究；通过对煤层气藏的赋存、运移机理的深入研究，首次建立了一套完整的煤层甲烷运移的数学模型、数值模型，并研制开发了相应的计算机模拟模型，创造性地建立了一套煤层甲烷气藏开发动态评价和预测的理论和方法，对煤层气藏的开发具有重要的实际意义和重要的指导作用。

Objective:To study the clinical and radilology characteristics of the patients with degenerative lower cervical instability.

目的：研究退行性下颈椎不稳的临床特征与放射学特征之间的关系及二者对诊断和治疗的意义。

Cynanchum Lingtai apricot production in the average weight 65 grams, the brightly-colored fruit, juicy rich, sweet-sour taste, sweet from the nucleolus, when the late Qing Dynasty famous Shaanxi, Gansu provinces, the Qing imperial court Tongzhi tribute for years.

灵台生产的牛心杏平均单果重65克，果实色泽鲜艳，汁多味浓，甜酸适口，离核仁甜，清末时就驰名陕、甘两省，清同治年间曾为朝廷贡品。

Chenopodium album,Solanum nigrum, and Amaranthus retroflexus were very susceptible to the herbicides. Polygonum persicaria and Abutilon theophrasti were relatively less susceptible to the herbicides, and Lycopersicon esculentum was not susceptible to it. The relationship between reduction rates of weed biomass and PPM values of weed leaves 2,4, and 6 days after treatment was established.

供试的6种杂草对该混剂的敏感性存在显著差异：红心藜Chenopodium album、龙葵Solanum nigrum和反枝苋Amaranthus retroflexus对该混剂最敏感，ED90值分别为47.65、71.67和29.17g/hm2；春蓼Polygonum persicaria和苘麻Abutilon theophrasti敏感，ED90值分别为96.91、114.20g/hm2；而番茄不敏感。