Total absorption gamma-ray spectroscopy(TAGS)is a powerful tool for measuring complexγ transitions,which has been effectively applied to the study of reactor decay heat.This paper presents the design of a new TAGS de...Total absorption gamma-ray spectroscopy(TAGS)is a powerful tool for measuring complexγ transitions,which has been effectively applied to the study of reactor decay heat.This paper presents the design of a new TAGS detector,the large-scale modular BGO detection array(LAMBDA),tailored for measuringβ-decay intensity distributions of fission products.The modular design allows the LAMBDA detectors to be assembled in various configurations.The final version of LAMBDA consists of 102 identical 60 mm×60 mm×120 mm BGO crystals and exhibits a high full-energy peak efficiency exceeding 80%at 0.5∼8 MeV based on a Monte Carlo simulation.Currently,approximately half of the LAMBDA modules have been manufactured.Tests usingγ-ray sources and nuclear reactions demonstrated favorable energy resolution,energy linearity,and efficiency uniformity across the modules.Forty-eight modules have been integrated into the prototype LAMBDA-I.The capability of LAMBDA-I inβ-delayedγ-decay experiments was evaluated by commissioning measurements using the ^(152)Eu source.展开更多
Background: Amyloidosis is a disease characterized by the deposition of fibrillar proteins in tissues. The nature of the protein defines the type of amyloidosis. Cardiac involvement is most often secondary to deposits...Background: Amyloidosis is a disease characterized by the deposition of fibrillar proteins in tissues. The nature of the protein defines the type of amyloidosis. Cardiac involvement is most often secondary to deposits of transthyretin and immunoglobulin light chains. Treatment depends on the type of amyloidosis. Cardiac light chain amyloidosis is a medical emergency. Aim: To highlight the importance of an early diagnosis of cardiac light chain amyloidosis. Case Presentation: We report the case of an 88-year-old hypertensive female patient with sustained atrial fibrillation and recurrent heart failure, in whom echocardiography showed concentric left ventricle hypertrophy with mildly reduced left ventricle ejection fraction (LVEF) to 45%. Bone scintigraphy was normal. Serum analysis showed increased lambda free light chains. Accessory salivary gland biopsy revealed weak Kappa light chain staining and clear overexpression of lambda light chain deposits. The diagnosis of stage 3B cardiac amyloidosis secondary to lambda light chain myeloma was made. After a multidisciplinary meeting, it was decided to start treatment with DARATUMUMAB + LENALIDOMIDE. Patient’s general condition deteriorated with the occurrence of febrile pancytopenia. Chemotherapy was stopped and management was limited to comfort care until the patient’s death. Conclusion: Cardiac light-chain amyloidosis must be diagnosed early as it can be rapidly fatal.展开更多
The operation of biomass treatment devices such as gasifiers is based on the control of key parameters that play an important role in product formation. These include: temperature, excess oxygen, relative humidity and...The operation of biomass treatment devices such as gasifiers is based on the control of key parameters that play an important role in product formation. These include: temperature, excess oxygen, relative humidity and biomass composition. This work focuses on excess oxygen and temperature. Unfortunately, flue gas oxygen analyzers are expensive and not accessible to small industries. However, the equivalence ratio is linked to excess oxygen and has the advantage of not depending on biomass composition. This study therefore focuses on the design and development of a device for controlling this equivalence ratio by measuring oxygen concentration using a self-propelled Lambda probe, and a system for monitoring this equivalence ratio using an Arduino Uno 3 microcontroller. The temperature is recorded with an accuracy of ±1.5°C. For a heating time of 10 minutes, the response time to temperature change is around 3 seconds, which is sufficient for the device to function properly. This simple device is an efficient and cost-effective means of checking the equivalence ratio.展开更多
基于载波相位观测值的RTK(Real time kinematic)定位技术能够在野外实时得到厘米级定位精度,核心技术是在动态条件下快速固定整周模糊度,解算动态条件下的模糊度参数。采用LAMBDA方法快速固定整周模糊度完成初始化,实时探测周跳,搜索并...基于载波相位观测值的RTK(Real time kinematic)定位技术能够在野外实时得到厘米级定位精度,核心技术是在动态条件下快速固定整周模糊度,解算动态条件下的模糊度参数。采用LAMBDA方法快速固定整周模糊度完成初始化,实时探测周跳,搜索并固定新的模糊度。用C++编制软件实现该算法,通过实测数据的计算,验证文中的方法和软件能够高效快速地固定整周模糊度,从而获得高精度的动态定位结果。展开更多
基金supported by the National Key R&D Program of China (Nos. 2022YFA1603300, 2018YFA0404401, 2023YFA1606701, and 2022YFA1602301)National Natural Science Foundation of China (Nos. U1867211, 12275026, and 12222514)the CAS Light of West China Program (No. 2020-82)
文摘Total absorption gamma-ray spectroscopy(TAGS)is a powerful tool for measuring complexγ transitions,which has been effectively applied to the study of reactor decay heat.This paper presents the design of a new TAGS detector,the large-scale modular BGO detection array(LAMBDA),tailored for measuringβ-decay intensity distributions of fission products.The modular design allows the LAMBDA detectors to be assembled in various configurations.The final version of LAMBDA consists of 102 identical 60 mm×60 mm×120 mm BGO crystals and exhibits a high full-energy peak efficiency exceeding 80%at 0.5∼8 MeV based on a Monte Carlo simulation.Currently,approximately half of the LAMBDA modules have been manufactured.Tests usingγ-ray sources and nuclear reactions demonstrated favorable energy resolution,energy linearity,and efficiency uniformity across the modules.Forty-eight modules have been integrated into the prototype LAMBDA-I.The capability of LAMBDA-I inβ-delayedγ-decay experiments was evaluated by commissioning measurements using the ^(152)Eu source.
文摘Background: Amyloidosis is a disease characterized by the deposition of fibrillar proteins in tissues. The nature of the protein defines the type of amyloidosis. Cardiac involvement is most often secondary to deposits of transthyretin and immunoglobulin light chains. Treatment depends on the type of amyloidosis. Cardiac light chain amyloidosis is a medical emergency. Aim: To highlight the importance of an early diagnosis of cardiac light chain amyloidosis. Case Presentation: We report the case of an 88-year-old hypertensive female patient with sustained atrial fibrillation and recurrent heart failure, in whom echocardiography showed concentric left ventricle hypertrophy with mildly reduced left ventricle ejection fraction (LVEF) to 45%. Bone scintigraphy was normal. Serum analysis showed increased lambda free light chains. Accessory salivary gland biopsy revealed weak Kappa light chain staining and clear overexpression of lambda light chain deposits. The diagnosis of stage 3B cardiac amyloidosis secondary to lambda light chain myeloma was made. After a multidisciplinary meeting, it was decided to start treatment with DARATUMUMAB + LENALIDOMIDE. Patient’s general condition deteriorated with the occurrence of febrile pancytopenia. Chemotherapy was stopped and management was limited to comfort care until the patient’s death. Conclusion: Cardiac light-chain amyloidosis must be diagnosed early as it can be rapidly fatal.
文摘The operation of biomass treatment devices such as gasifiers is based on the control of key parameters that play an important role in product formation. These include: temperature, excess oxygen, relative humidity and biomass composition. This work focuses on excess oxygen and temperature. Unfortunately, flue gas oxygen analyzers are expensive and not accessible to small industries. However, the equivalence ratio is linked to excess oxygen and has the advantage of not depending on biomass composition. This study therefore focuses on the design and development of a device for controlling this equivalence ratio by measuring oxygen concentration using a self-propelled Lambda probe, and a system for monitoring this equivalence ratio using an Arduino Uno 3 microcontroller. The temperature is recorded with an accuracy of ±1.5°C. For a heating time of 10 minutes, the response time to temperature change is around 3 seconds, which is sufficient for the device to function properly. This simple device is an efficient and cost-effective means of checking the equivalence ratio.
文摘基于载波相位观测值的RTK(Real time kinematic)定位技术能够在野外实时得到厘米级定位精度,核心技术是在动态条件下快速固定整周模糊度,解算动态条件下的模糊度参数。采用LAMBDA方法快速固定整周模糊度完成初始化,实时探测周跳,搜索并固定新的模糊度。用C++编制软件实现该算法,通过实测数据的计算,验证文中的方法和软件能够高效快速地固定整周模糊度,从而获得高精度的动态定位结果。
