These days China produces most of the world's HFC-23.
现如今中国生产了世界上大部分的HFC - 23。
The very cheapness of cutting emissions of HFC-23 makes the trade controversial.
减排HFC-23非常廉价，使得这个交易备受争议。
Factories have found that their damaging by-product, HFC-23, can be more valuable than their main output.
工厂发现他们的有害副产品HFC - 23还比主要产品更值钱。
The number of new projects targeting HFC emissions is falling as developers run out of factories in which to install the cleaning equipment.
针对氢氟烃排放的新项目数量正在减少，因为可供安装清洁设备的工厂已所剩无几。
Ingress noise has great proportion in sorts of noise on upstream channel in HFC.
在HF C网络回传通路各类噪声中，输入噪声占有相当大的比重。
But practice shows that HFC does not always behave as a broadband network as we think.
但从技术实践来看，HFC表现出来的并不完全是宽带的特性。
We designed a kind of data broadcast system based on HFC network without return paths.
我们针对缺乏回传通道的传统有线电视网络，设计了一个基于HFC的数据广播系统。
This paper describes Hunan district-country multimedia video conference system based on HFC.
主要介绍了基于宽带图象通信网的湖南省-地多媒体电视会议系统。
The analysis indicates that S-CDMA technique adapts to the transmission channel in HFC system.
分析结果表明，S-CDMA技术是一种能有效实用于HFC系统的多址接入技术。
Based on new HFC Network, this thesis is to design and realize gatekeeper software of IP telephone.
本文研究的是基于新型HFC网络的IP电话关守软件的设计和实现。
This paper describes the evolution process of a HFC network for accessing multi services by four stages.
分四个阶段讨论了利用HFC网络开展多业务接入的过程。
Then discusses the interactive operation through the CATV networks, especially the HFC access technology.
接着讨论了有线电视网上的交互业务，尤其是HFC接入技术。
On the basis of analyzing HFC and EPON, the method of digital television transmission over EPON is proposed.
在分析HFC与EPON有关性质的基础上，提出基于EPON的数字电视传输方法。
This paper introduces the oil solubility behaviours of several currently available HFC substitute refrigerants.
介绍了目前可行的几种HFC替代制冷剂的溶油特性。
This paper presents a design of transparent bridge which can connect cable network and Ethernet in HFC network.
实现了一种在光纤同轴电缆混合接入（HFC）中连接电缆网络和以太网的透明网桥。
The results show that the protective atmosphere of air containing 0.1% HFC-32 has a fairly good protective effect.
结果表明：含0.1%体积浓度的HFC-32保护气体可以较好地起到保护作用；
The operation instruction applies to the operation and maintenance of the Marine HFC-227ea fire suppression plant.
本操作使用说明书适用于船用七氟丙烷灭火装置的操作使用、维护保养。
This paper introduces some concrete requirements for and procedures of the transformation and upgrade of HFC network.
文章介绍了HFC网络改造升级的一些具体要求及步骤。
Bidirectional HFC (hybrid fiber coaxial) is one of most important network resources for digital multimedia communication.
双向光纤同轴电缆混合网(HFC)是今后宽带多媒体通信的重要基础网络之一。
In this paper, the transmission technology of HFC network and its applications in CATV networks are analyzed and studied.
分析和研究了HFC网络传输技术及其在CAT V网络中的应用。
Having referred to a lot of documents, the author analyzed the HFC network's frequency spectrum, topology and channel features.
论文作者查阅了大量文献，分析了HFC网络的频谱划分、拓扑结构、信道特点。
Abstract: This paper introduces some concrete requirements for and procedures of the transformation and upgrade of HFC network.
文摘：文章介绍了HFC网络改造升级的一些具体要求及步骤。
This pager introduces simply the interrelation between analog modulation signal and digital modulation signal on HFC networks recently.
简要叙述现阶段HFC网络中模拟调制信号与数字调制信号的相互影响。
CM data transmission system is established based upon DOCSIS2.0, so that the services of video, voice and data could be inosculated in HFC network.
在HFC网上建立基于DOCSIS2.0的CM数据传输系统，实现HFC网络中视频、语音、数据等业务的融合。
Network configuration, spectrum allocation, two-way communication, protocol at lower layer and network management for HFC are analysed and studied.
文中对这种网络的网络结构、频谱划分、双向通信、低层协议以及网络管理进行了分析研究。
CMTS system is one of the key devices in HFC network, it can make CATV users access broad-band network and enjoy the interactive integrated service.
CMTS系统是HFC网络中的关键设备之一，它能够使有线电视用户实现宽带接入并享受交互式综合业务服务。
The improvement field emission by Hf coating on CNTs surface is attributed to the low work function, chemical inertness and good conductivity of HfC.
我们认为碳纳米管表面发射性能的提高归功于表面碳化铪膜良好的导电性、化学惰性和低逸出功。
Introduced the application of low optical power receiver to HFC network. Signal testing and economical benefit analyzing were presented at the same time.
介绍低光功率接收机在有线电视HF C网络中的应用，并对信号指标进行测试和比较，对经济效益进行分析。
But the existence of noise funneling in the return path of cable network in HFC system restricts the selection of modulation techniques for the return path.
但HFC网络中同轴电缆网络上行信道中存在的噪声漏斗效应限制了上行信道调制技术的选择。
But the existence of noise funneling in the return path of cable network in HFC system restricts the selection of modulation techniques for the return path.
但HFC网络中同轴电缆网络上行信道中存在的噪声漏斗效应限制了上行信道调制技术的选择。
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