Based on the property that high degree variable nodes within an irregular LowDensity Parity-Check (LDPC) code have more powerful error-correcting capability than that of low degree variable nodes, a group of irregular...Based on the property that high degree variable nodes within an irregular LowDensity Parity-Check (LDPC) code have more powerful error-correcting capability than that of low degree variable nodes, a group of irregular LDPC codes with Unequal Error Protection (UEP)property is designed in this letter. Simulation results show that the transmission quality of the image may be effectively improved with this class of irregular LDPC code.展开更多
Within a LIFE＋ project IPNOA （improved flux prototype for n2o emission from agriculture）, LIFE11 ENV/IT/302 is a mobile prototype was developed to evaluate at field scale N20 emissions using a fast chamber techniqu...Within a LIFE＋ project IPNOA （improved flux prototype for n2o emission from agriculture）, LIFE11 ENV/IT/302 is a mobile prototype was developed to evaluate at field scale N20 emissions using a fast chamber technique. Main challenge was to develop a mobile system capable of moving on various field surfaces, equipped with very reliable N20 gas analyser （Los Gatos Research Inc.）, electrically autonomous （with batteries） and enough robust to face up to field conditions. In this paper, we report the major features of this prototype studied during two field campaigns. The N20 flux IPNOA prototype was compared with other methodological implementations： first, during an INGOS （integrated non-CO2 greenhouse gas observing systems） campaign on a grazed grassland at Easter Bush （Scotland） by Eddy correlation method, and then after on an arable crop at Grignon （France） using automatic and manual chambers fitted with QC-TILDAS （Quantum Cascade Tunable Infrared Laser Differential Absorption Spectrometer, Aerodyne Research Inc.）, with the 46C model of thermo-instrument analyser or with a GC （gas chromatography） analysis.展开更多
SPIE-Vol.3785 01173941999年SPIE会议录,Vol.3785:先进的望远镜设计、制造与控制=1999 proceedings of SPIE,Vol.3785:Advanced telescope design,fabrication,and control[会,英]/SPIE-The International Society for Optical Engi-ne...SPIE-Vol.3785 01173941999年SPIE会议录,Vol.3785:先进的望远镜设计、制造与控制=1999 proceedings of SPIE,Vol.3785:Advanced telescope design,fabrication,and control[会,英]/SPIE-The International Society for Optical Engi-neering.—1999.—190P.(EC)本会议录收集了于1999年7月19～21日在科罗拉多州Denver召开的望远镜设计、制造与控制会议上发表的19篇论文,内容涉及空间望远镜制造设计技术,3.8m英国红外望远镜,Integral光学监视像机子系统的接入测试,激光辐射应用,望远镜镜面测试的象差分析,低成本变形镜的有限元分析,单片SiC望远镜。展开更多
文摘Based on the property that high degree variable nodes within an irregular LowDensity Parity-Check (LDPC) code have more powerful error-correcting capability than that of low degree variable nodes, a group of irregular LDPC codes with Unequal Error Protection (UEP)property is designed in this letter. Simulation results show that the transmission quality of the image may be effectively improved with this class of irregular LDPC code.
文摘Within a LIFE＋ project IPNOA （improved flux prototype for n2o emission from agriculture）, LIFE11 ENV/IT/302 is a mobile prototype was developed to evaluate at field scale N20 emissions using a fast chamber technique. Main challenge was to develop a mobile system capable of moving on various field surfaces, equipped with very reliable N20 gas analyser （Los Gatos Research Inc.）, electrically autonomous （with batteries） and enough robust to face up to field conditions. In this paper, we report the major features of this prototype studied during two field campaigns. The N20 flux IPNOA prototype was compared with other methodological implementations： first, during an INGOS （integrated non-CO2 greenhouse gas observing systems） campaign on a grazed grassland at Easter Bush （Scotland） by Eddy correlation method, and then after on an arable crop at Grignon （France） using automatic and manual chambers fitted with QC-TILDAS （Quantum Cascade Tunable Infrared Laser Differential Absorption Spectrometer, Aerodyne Research Inc.）, with the 46C model of thermo-instrument analyser or with a GC （gas chromatography） analysis.
文摘SPIE-Vol.3785 01173941999年SPIE会议录,Vol.3785:先进的望远镜设计、制造与控制=1999 proceedings of SPIE,Vol.3785:Advanced telescope design,fabrication,and control[会,英]/SPIE-The International Society for Optical Engi-neering.—1999.—190P.(EC)本会议录收集了于1999年7月19～21日在科罗拉多州Denver召开的望远镜设计、制造与控制会议上发表的19篇论文,内容涉及空间望远镜制造设计技术,3.8m英国红外望远镜,Integral光学监视像机子系统的接入测试,激光辐射应用,望远镜镜面测试的象差分析,低成本变形镜的有限元分析,单片SiC望远镜。
