Numerical Simulation of Tailings Flow from Dam Failure over Complex Terrain.

A tailings dam failure can lead to disastrous impacts on people's livelihood and the surrounding ecological environment. Due to interactions among water, tailings and ground, the mechanism of a tailings flow is more complicated than that of a flood flow. In this paper, the tailings flow is regarded as a homogeneous and incompressible non-Newtonian fluid. Its rheological properties were studied through rheological tests conforming to the Bingham model. The rheological parameters were further used in a Computational Fluid Dynamics (CFD) simulation over complex terrain to explore the tailings flow characteristics. The method was validated with experimental results of a non-Newtonian dam-break flow from literature. The flow characteristics, including flow velocity, runout distance, inundation area and depth, were analyzed in the case of the Dagangding tailings dam. The results showed that the downstream railway and village would not be affected in a conservative scenario. Finally, the effects of two measures for preventing tailings flow hazards were discussed. Setting the check dam and planting grasses and trees can effectively mitigate the damage of tailings flow.

Expert consensus on the safety prevention and control of nuclear medicine diagnosis and treatment during the outbreak of COVID-19 (1st edition): (translated from Chinese version).

In December 2019, an infectious disease caused by a new type of coronavirus infection was prevalent in Wuhan and across the country. On January 20, 2020, the National Health Commission of the People's Republic of China issued No.1 Announcement, which incorporated the novel coronavirus pneumonia into the Class B infectious disease according to the Law on Prevention and Control of Infectious Disease, but the disease should be adopted in the management of Class A infectious disease. In order to effectively control the source of infection, cut off the transmission route, protect the susceptible population, ensure the medical quality and medical safety, perform epidemic prevention and control, and comprehensively guarantee the life safety and physical health of medical staff, patients, and family members, it is very important to organize and carry out nuclear medicine diagnosis and treatment scientifically and safely. According to the national prevention and control policy, Chinese Society of Nuclear Medicine and editorial board of the Chinese Journal of Nuclear Medicine and Molecular Imaging organized professionals to formulate the expert consensus on the safety prevention process of nuclear medicine imaging and nuclide therapy during the period of new coronavirus infection.

Protection management and procedures of nuclear medicine imaging during novel coronavirus (2019-nCov) infection epidemic period / 中华核医学与分子影像杂志

At the end of December 2019,acute respiratory infectious diseases caused by a new type of coronavirus were prevalent in Wuhan and other cities of China.Different from radiology examinations,the protocols of nuclear medical imaging examinations are complicated,in which more workplaces and staff are needed,resulting more complex management of patients and higher protection requirements.Combined with the characteristics of SPECT and PET imaging procedures,this paper puts forward some suggestions on the protective process of imaging examinations for patients with confirmed or suspected novel coronavirus infection.The main purpose is to protect medical staff from virus infection,effectively reduce the risk of virus transmission during the examination process,and ensure the medical quality and safety.

Protection management and procedures of nuclear medicine imaging during novel coronavirus (2019-nCov) infection epidemic period / 中华核医学与分子影像杂志

At the end of December 2019, acute respiratory infectious diseases caused by a new type of coronavirus were prevalent in Wuhan and other cities of China. Different from radiology examinations, the protocols of nuclear medical imaging examinations are complicated, in which more workplaces and staff are needed, resulting more complex management of patients and higher protection requirements. Combined with the characteristics of SPECT and PET imaging procedures, this paper puts forward some suggestions on the protective process of imaging examinations for patients with confirmed or suspected novel coronavirus infection. The main purpose is to protect medical staff from virus infection, effectively reduce the risk of virus transmission during the examination process, and ensure the medical quality and safety.

Protection management and procedures of nuclear medicine imaging during novel coronavirus (2019-nCov) infection epidemic period / 中华核医学与分子影像杂志

At the end of December 2019, acute respiratory infectious diseases caused by a new type of coronavirus were prevalent in Wuhan and other cities of China. Different from radiology examinations, the protocols of nuclear medical imaging examinations are complicated, in which more workplaces and staff are needed, resulting more complex management of patients and higher protection requirements. Combined with the characteristics of SPECT and PET imaging procedures, this paper puts forward some suggestions on the protective process of imaging examinations for patients with confirmed or suspected noval coronavirus infec- tion. The main purpose is to protect medical staff from virus infection, effectively reduce the risk of virus transmission during the examination process, and ensure the medical quality and safety.

Expert consensus on the safety prevention and control of nuclear medicine diagnosis and treatment during the outbreak of COVID-19 (1st edition) / 中华核医学与分子影像杂志

In December 2019, an infectious disease caused by a new type of coronavirus infection was prevalent in Wuhan and across the country. On January 20, 2020, the National Health Commission of the People′s Republic of China issued No. 1 Announcement, which incorporated the novel coronavirus pneumonia into the Class B infectious diseases according to the Law on Prevention and Control of Infectious Diseases, but the disease should be adopted the management of Class A infectious diseases. In order to effectively control the source of infection, cut off the transmission route, protect the susceptible population, ensure the medical quality and medical safety, effectively perform epidemic prevention and control, comprehensively guarantee the life safety and physical health of medical staff, patients and family members, it is very important to organize and carry out nuclear medicine diagnosis and treatment scientifically and safely. According to the national prevention and control policy, Chinese Society of Nuclear Medicine and Editorial Board of Chinese Journal of Nuclear Medicine and Molecular Imaging organized professionals to formulate the expert consensus on the safety protection process of nuclear medicine imaging and nuclide therapy during the period of new coronavirus infection.

A method exploiting direct communication between phasor measurement units for power system wide-area protection and control algorithms.

Synchrophasor measurements from Phasor Measurement Units (PMUs) are the primary sensors used to deploy Wide-Area Monitoring, Protection and Control (WAMPAC) systems. PMUs stream out synchrophasor measurements through the IEEE C37.118.2 protocol using TCP/IP or UDP/IP. The proposed method establishes a direct communication between two PMUs, thus eliminating the requirement of an intermediate phasor data concentrator, data mediator and/or protocol parser and thereby ensuring minimum communication latency without considering communication link delays. This method allows utilizing synchrophasor measurements internally in a PMU to deploy custom protection and control algorithms. These algorithms are deployed using protection logic equations which are supported by all the PMU vendors. Moreover, this method reduces overall equipment cost as the algorithms execute internally in a PMU and therefore does not require any additional controller for their deployment. The proposed method can be utilized for fast prototyping of wide-area measurements based protection and control applications. The proposed method is tested by coupling commercial PMUs as Hardware-in-the-Loop (HIL) with Opal-RT's eMEGAsim Real-Time Simulator (RTS). As illustrative example, anti-islanding protection application is deployed using proposed method and its performance is assessed. The essential points in the method are: •Bypassing intermediate phasor data concentrator or protocol parsers as the synchrophasors are communicated directly between the PMUs (minimizes communication delays).•Wide Area Protection and Control Algorithm is deployed using logic equations in the client PMU, therefore eliminating the requirement for an external hardware controller (cost curtailment)•Effortless means to exploit PMU measurements in an environment familiar to protection engineers.

Multicast Delayed Authentication For Streaming Synchrophasor Data in the Smart Grid.

Multicast authentication of synchrophasor data is challenging due to the design requirements of Smart Grid monitoring systems such as low security overhead, tolerance of lossy networks, time-criticality and high data rates. In this work, we propose inf -TESLA, Infinite Timed Efficient Stream Loss-tolerant Authentication, a multicast delayed authentication protocol for communication links used to stream synchrophasor data for wide area control of electric power networks. Our approach is based on the authentication protocol TESLA but is augmented to accommodate high frequency transmissions of unbounded length. inf TESLA protocol utilizes the Dual Offset Key Chains mechanism to reduce authentication delay and computational cost associated with key chain commitment. We provide a description of the mechanism using two different modes for disclosing keys and demonstrate its security against a man-in-the-middle attack attempt. We compare our approach against the TESLA protocol in a 2-day simulation scenario, showing a reduction of 15.82% and 47.29% in computational cost, sender and receiver respectively, and a cumulative reduction in the communication overhead.