A spatial and wavelength division multi- plexing fiber Bragg grating （FBG） sensing system is reported for monitoring the temperature and the pressure （T-P） of hot water pipeline in petrochemieal factory. The FBG s...A spatial and wavelength division multi- plexing fiber Bragg grating （FBG） sensing system is reported for monitoring the temperature and the pressure （T-P） of hot water pipeline in petrochemieal factory. The FBG sensing system has 72 channels independently, and it provides the capability to monitor large number sensors at same time. A resolution of 0.1℃ and 0.01 MPa with a measurement bandwidth of 150 Hz has been achieved.展开更多
To the Editor:A 64-year-old Chinese man(65 kg)with fever and lymphadenopathy was admitted to the hematology department of the Peking University First Hospital.Before admission,he had had intermittent fever for the pas...To the Editor:A 64-year-old Chinese man(65 kg)with fever and lymphadenopathy was admitted to the hematology department of the Peking University First Hospital.Before admission,he had had intermittent fever for the past 3 months with a body temperature high of 38.5°C.He had no accompanying discomfort and his temperature sometimes dropped to normal without drugs.One month before admission,he found several palpable enlarged cervical lymph nodes.Upon admission,a lymph node biopsy was conducted and the pathological diagnosis showed a nodular sclerosis,a subtype of classical Hodgkin lymphoma.展开更多
A European pressurized reactor （EPR） steel containment liner structure is comprised of the cylinder part and the dome part. An introduction of the steel liner structure is presented, followed by studies on the key m...A European pressurized reactor （EPR） steel containment liner structure is comprised of the cylinder part and the dome part. An introduction of the steel liner structure is presented, followed by studies on the key mechanical features of the construction process using a refined finite element method. The steel liner was divided into several modules and then assembled during construction. Firstly, the equipment structure used to hoist the liner module was optimized, the lifting lug was analyzed using a multi-scale finite element model; the wind speed limit during lifting was also studied. Subsequently, the effect of internal forces during assembly between the liner modules, the lateral pressure of fresh concrete, the non-uniform temperature load, and the wind load on the cylinder module was analyzed. According to the time-varying structural performance during continuous concrete pouring and the hardening construction, an ＂overlapping element and birth-death element＂ technique was adopted to analyze the deformation and stress of the long-span steel dome liner. In addition, the stability-bearing capacities of the dome structure during construction were also studied, which took into consideration the effect of the initial geometrical imperfections and the elasto-plasticity of the material. This study presents a reference in terms of the mechanics of the construction scheme and the safety of such a type of structure.展开更多
基金supported by Key Projects the National Natural Science Foundation of China under Grant No. 50538020the Education Department Science Foundation of Heilongjiang Province under Grant No. 11521211the Technology Department Science Foundation of Heilongjiang Province under Grant No. GC07A506.
文摘A spatial and wavelength division multi- plexing fiber Bragg grating （FBG） sensing system is reported for monitoring the temperature and the pressure （T-P） of hot water pipeline in petrochemieal factory. The FBG sensing system has 72 channels independently, and it provides the capability to monitor large number sensors at same time. A resolution of 0.1℃ and 0.01 MPa with a measurement bandwidth of 150 Hz has been achieved.
基金supported by the Municipal Science Technology Commission(No.Z191100006619026)。
文摘To the Editor:A 64-year-old Chinese man(65 kg)with fever and lymphadenopathy was admitted to the hematology department of the Peking University First Hospital.Before admission,he had had intermittent fever for the past 3 months with a body temperature high of 38.5°C.He had no accompanying discomfort and his temperature sometimes dropped to normal without drugs.One month before admission,he found several palpable enlarged cervical lymph nodes.Upon admission,a lymph node biopsy was conducted and the pathological diagnosis showed a nodular sclerosis,a subtype of classical Hodgkin lymphoma.
基金Project supported by the China State Construction Engineering Corporation Funded Project （No. CSCEC-2008-Z-17）, the National Natural Science Foundation of China （No. 51308155）, the Funda- mental Research Funds for the Central Universities of China （No. HIT.NSRIF.2014100）, and the China Postdoctoral Science Founda- tion Funded Proiect （Nos. 2013M541389 and 2015T80355）
文摘A European pressurized reactor （EPR） steel containment liner structure is comprised of the cylinder part and the dome part. An introduction of the steel liner structure is presented, followed by studies on the key mechanical features of the construction process using a refined finite element method. The steel liner was divided into several modules and then assembled during construction. Firstly, the equipment structure used to hoist the liner module was optimized, the lifting lug was analyzed using a multi-scale finite element model; the wind speed limit during lifting was also studied. Subsequently, the effect of internal forces during assembly between the liner modules, the lateral pressure of fresh concrete, the non-uniform temperature load, and the wind load on the cylinder module was analyzed. According to the time-varying structural performance during continuous concrete pouring and the hardening construction, an ＂overlapping element and birth-death element＂ technique was adopted to analyze the deformation and stress of the long-span steel dome liner. In addition, the stability-bearing capacities of the dome structure during construction were also studied, which took into consideration the effect of the initial geometrical imperfections and the elasto-plasticity of the material. This study presents a reference in terms of the mechanics of the construction scheme and the safety of such a type of structure.
