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Investigation of system parameters towards safer impact based shock-to-detonation transition in a novel laser driven flyer plate prototype
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作者 Gonca Saglam Ozkasapoglu Selis Onel 《Defence Technology(防务技术)》 SCIE EI CAS CSCD 2024年第9期103-113,共11页
Laser driven flyer plate technology offers improved safety and reliability for detonation of explosives in industrial applications ranging from mining and stone quarrying to the aerospace and defense industries.This s... Laser driven flyer plate technology offers improved safety and reliability for detonation of explosives in industrial applications ranging from mining and stone quarrying to the aerospace and defense industries.This study is based on developing a safer laser driven flyer plate prototype comprised of a laser initiator and a flyer plate subsystem that can be used with secondary explosives.System parameters were optimized to initiate the shock-to-detonation transition(SDT)of a secondary explosive based on the impact created by the flyer plate on the explosive surface.Rupture of the flyer was investigated at the mechanically weakened region located on the interface of these subsystems,where the product gases from the deflagration of the explosive provide the required energy.A bilayer energetic material was used,where the first layer consisted of a pyrotechnic component,zirconium potassium perchlorate(ZPP),for sustaining the ignition by the laser beam and the second layer consisted of an insensitive explosive,cyclotetramethylene-tetranitramine(HMX),for deflagration.A plexiglass interface was used to enfold the energetic material.The focal length of the laser beam from the diode was optimized to provide a homogeneous beam profile with maximum power at the surface of the ZPP.Closed bomb experiments were conducted in an internal volume of 10 cm^(3) for evaluation of performance.Dependency of the laser driven flyer plate system output on confinement,explosive density,and laser beam power were analyzed.Measurements using a high-speed camera resulted in a flyer velocity of 670±20 m/s that renders the prototype suitable as a laser detonator in applications,where controlled employment of explosives is critical. 展开更多
关键词 Laser driven flyer plate shock to detonation transition DETONATION Secondary explosives Pyrotechnic materials CONFINEMENT
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Heat shock protein 70 expression in relation to apoptosis in primary bladder transitional cell carcinoma 被引量:3
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作者 HE Ling-feng GUAN Kao-peng +4 位作者 YE Hai-yun REN Liang YAN Zheng WANG Shen-wu HOU Shu-kun 《Chinese Medical Journal》 SCIE CAS CSCD 2005年第24期2093-2096,共4页
Bladder carcinoma is the most common tumor in the urinary system. In 1996, a sampleinvestigation showed that bladder carcinoma, in which more than 90% was mainly primary bladder transitional cell carcinoma (BTCC), w... Bladder carcinoma is the most common tumor in the urinary system. In 1996, a sampleinvestigation showed that bladder carcinoma, in which more than 90% was mainly primary bladder transitional cell carcinoma (BTCC), was one of the ten highest mortality malignant tumors in China. Bladder carcinoma represented 2% of all malignant tumors and has the fifth most common malignancy in men in Europe and North America. 展开更多
关键词 heat shock protein 70 apoptosis bladder transitional cell carcinoma
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Comparative Study on Two Melting Simulation Methods:Melting Curve of Gold
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作者 刘中利 孙俊生 +2 位作者 李瑞 张修路 蔡灵仓 《Communications in Theoretical Physics》 SCIE CAS CSCD 2016年第5期613-616,共4页
Melting simulation methods are of crucial importance to determining melting temperature of materials efficiently.A high-efficiency melting simulation method saves much simulation time and computational resources.To co... Melting simulation methods are of crucial importance to determining melting temperature of materials efficiently.A high-efficiency melting simulation method saves much simulation time and computational resources.To compare the efficiency of our newly developed shock melting(SM)method with that of the well-established two-phase(TP)method,we calculate the high-pressure melting curve of Au using the two methods based on the optimally selected interatomic potentials.Although we only use 640 atoms to determine the melting temperature of Au in the SM method,the resulting melting curve accords very well with the results from the TP method using much more atoms.Thus,this shows that a much smaller system size in SM method can still achieve a fully converged melting curve compared with the TP method,implying the robustness and efficiency of the SM method. 展开更多
关键词 solid-liquid transition high-pressure molecular dynamics shock wave
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Hugoniot equation of state of olivine and its geodynamic implications
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作者 HUANG Xiao Ge YUAN Xian Hao +2 位作者 CHEN Zu An LIU Fu Sheng BAI Wu Ming 《Science China Earth Sciences》 SCIE EI CAS CSCD 2016年第3期619-625,共7页
Large olivine samples were hot-pressed synthesized for shock wave experiments. The shock wave experiments were carried out at pressure range between 11 and 42 GPa. Shock data on olivine sample yielded a linear relatio... Large olivine samples were hot-pressed synthesized for shock wave experiments. The shock wave experiments were carried out at pressure range between 11 and 42 GPa. Shock data on olivine sample yielded a linear relationship between shock wave velocity D and particle velocity u described by D=3.56(?0.13)+2.57(?0.12)u. The shock temperature is determined by an energy relationship which is approximately 790°C at pressure 28 GPa. Due to low temperature and short experimental duration, we suggest that no phase change occurred in our sample below 30 GPa and olivine persisted well beyond its equilibrium boundary in metastable phase. The densities of metastable olivine are in agreement with the results of static compression. At the depth shallower than 410 km, the densities of metastable olivine are higher than those of the PREM model, facilitating cold slab to sink into the mantle transition zone. However, in entire mantle transition zone, the shock densities are lower than those of the PREM model, hampering cold slab to flow across the "660 km" phase boundary. 展开更多
关键词 Hugonite density shock temperature Olivine Mantle transition zone
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