The continuous development of the internet and web techniques , the augment of the calculator speed and the bandwidth , and the diversification of the form to connect to network , these turn into the material and technical foundation for engineering construction management by internet techniques Internet及web技术不断发展，计算机处理速度和网络带宽及覆盖面的不断提升，网络接入形式多样化，为基于internet及web技术的工程建设管理信息化发展奠定了技术和物质基础。
The prototype test results indicate : voltage mode and current mode ac - ac mode ac / ac converters with high frequency link have the advantages such as high frequency electrical isolation . simple topology , two - stage power conversions , high power density , bidirectional power flow , good line current waveform , no audio noise , high converting efficiency , and high input power factor etc . this kind of converter lay the key technical foundation on new type regulated sinusoidal ac power supply , electronic transformer , ac regulator , and wave converter etc 试验表明，这类变换器具有高频电气隔离、电路拓扑简洁、两级功率变换( lfac hfac lfac ) 、功率密度高、双向功率流、无音频噪音、变换效率高、网侧功率因数高等优点。为新一代正弦交流稳压器、电子变压器、交流调压器、同频波形变换器的实现奠定了关键技术基础。
This research investigated the variability and the quantitative relationships among soil nutrients ( soil ph , total n , organic matter , available p ) , growth status ( spad , lai and spad lai ) and yield of rice . all data were analyzed by both classical statistics and geostatistics based on gis . by further integrating gis , gps and crop management knowledge model , a decision support system for precision farming ( dsspf ) was developed , which laid a technical foundation for the practical application of precision farming system 本研究基于gis技术，以经典统计和地统计学为分析手段，确立了田区土壤养分(土壤ph 、全氮、有机质、速效磷、速效钾) 、水稻作物长势( spad 、 lai 、 spad * lai )和产量的空间变异特征及定量关系；进一步以作物管理知识模型为智能决策支撑，提出了gis与模型及gis与gps的组件化集成技术，构建和实现了基于田区作物产量、土壤养分和苗情监测差异的精确农作决策支持系统( dsspf ) ，为精确农作系统的应用奠定了技术基础。
The progect has got the imbursement of progect named " burst mode receiver / transmitter in broadband access network " ( no : 2002aa101a04 ) . the accomplishment of the 155mb / s burst mode receiver makes essential conditions for the accessing of optical fiber to the common families and estabiishs a theory and technical foundation of the developing burst mode receiver / transmitter of the speed over 155mbit / s 本课题的研究得到项目“宽带接入网突发式光发射和接收模块” (项目编号： 2002aa101a04 )的资助。 155mb s突发式光接收模块的研制成功为光纤进入普通家庭创造了基本的条件，也为以后开发155mb s以上速率的突发式光收发模块奠定了坚实的理论和技术基础。
Zhanmei metal company has strong technical force , including over 40 managerial and technical and technical personnel of different fields . the company has also established cooperative relationship with guangzhou nonferrous metals institute , south china university of science and engineering , zhougshang university and so on , which offers technical foundation of sustainable development of zhanmei ：铜材工业铝型材合金铝棒铜铝线材铜铝板材技术后盾：公司拥有“占美研发” “占美理化测试”二个质量测试监督中心，并与广州有色金属学院华南理工大学中山大学等多间学院建立技术合作关系。
