China Academy of Engineering Physics

Mianyang, China

China Academy of Engineering Physics

Mianyang, China

China Academy of Engineering Physics is founded in October, 1958. It is the research and manufacturing center of Chinese nuclear weapons. CAEP was initially located in Beijing. Its major departments were later relocated to Qinghai Province. In 1970, the major components moved to Sichuan Province. The Academy was formerly named Ninth Institute of Second Ministry of Mechanical Industry, and Ninth Institute of Ministry of Nuclear Industry. It was later renamed CAEP. In China, the Ninth Institute is still well recognized. Its headquarters is in the 839 area of Mianyang, which covers a land area of 5 km2. It's nicknamed Scientific Town. It has multiple branches in Beijing, Jiangyou, Chengdu and Shanghai. The Academy currently has 12 research institutes and 15 national key laboratories. Its research areas include shock wave and explosive physics, nuclear and plasma physics, engineering and material science, electronics and photo-electronics, radioactive chemistry and chemical engineering, computer science and computational mathematics, etc. CAEP has over 8,000 researchers and technicians. Some prominent Chinese scientists used to be leaders of the academy, including Yu Min, Wang Ganchang, Deng Jiaxian, Zhu Guangya, Chen Nengkuan, Zhou Guangzhao, Guo Yonghuai, Cheng Kaijia, and Peng Huanwu. It currently has 9 academicians of Chinese Academy of science , and 7 academicians of Chinese Academy of Engineering , and a number of outstanding scientists. Wikipedia.


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Zhang Q.,China Academy of Engineering Physics | Shreeve J.M.,University of Idaho
Chemical Reviews | Year: 2014

The paper presents a review of energetic ionic liquids (EILs) including history, syntheses, properties, and applications in the fields of energetic materials. The main aim of this work is to present the latest advances of EILs as new energetic materials and to emphasize the new possibilities and the future challenges in this field. A new research field of utilizing the reactivity of EILs for bipropellant applications has opened up with the discovery of the IL hypergols. It has been observed that different substituents and energy-containing groups can significantly influence the properties and performance of EILs such as melting point, energy density, thermal stability, detonation properties, and sensitivity. The dual-functional strategy can also allow the independent design of the structures of both cation and anion, making the energetic performance and safety issues of the final EILs reasonably predictable.


Yang R.-C.,China Academy of Engineering Physics
Optics and Lasers in Engineering | Year: 2014

A nonlinear Tikhonov regularization scheme is developed to tackle the ill-posed finite-element digital image correlation, which aims to measure the displacement field from consequent digital images before and after deformation. The goal of this algorithm is to resolve the displacement field with fine and irregular structure without deteriorated by the measuring errors due to its ill-posedness. A Newton-type method is employed to linearize the nonlinear problem iteratively, then the Tikhonov regularization is applied to the linearized problem, with the regularization parameter adaptively chosen by the L-curve method. The proposed algorithm is verified by computer simulated input images with a priori displacement field. The result shows that it is capable of resolving displacement field with very fine structure in a reasonable accuracy. © 2014 Published by Elsevier Ltd.


Zhang C.,China Academy of Engineering Physics
Journal of Physical Chemistry C | Year: 2010

The desensitizing mechanism of amorphous olefin in a typical explosive HMX against external mechanical stimuli was investigated by loading uniaxial compression and shear on four cells composed of pure HMX, pure olefin, HMX + 3 wt % olefin, and HMX + 9 wt % olefin, respectively. As a result, it was confirmed that the mechanism under the loading conditions is predominantly attributed to the good lubricating property of olefin, which can greatly reduce shear stress denoted by shear sliding barriers. At the same time, the addition of a little olefin in HMX, for example, below 10 wt %, cannot obviously improve the compressibility of HMX-based explosives. It therefore indicates the lowered mechanical sensitivity is not caused by improving compressibility. In addition, my simulations did not show that the more olefin added in HMX results in the more evident desensitizing effect, suggesting a critical point of the component of HMX + olefin corresponding to a lowest shear stress. © 2010 American Chemical Society.


Chen Z.-Y.,China Academy of Engineering Physics
Applied Physics Letters | Year: 2013

A scheme to generate high field terahertz (THz) pulses by using tailored laser pulses interaction with a gas target is proposed. The laser wakefield based THz source is emitted from the asymmetric laser shape induced plasma transverse transient net currents. Particle-in-cell simulations show that THz emission with electric filed strength over 1 GV/cm can be obtained with incident laser at 1 × 10 19 W / cm2 level, and the corresponding energy conversion efficiency is more than 10 - 4. The intensity scaling holds up to high field strengths. Such a source also has a broad tunability range in amplitude, frequency spectra, and temporal shape. © 2013 AIP Publishing LLC.


Li J.,China Academy of Engineering Physics
Journal of Hazardous Materials | Year: 2010

The ZPE-corrected N-NO2 bond dissociation energies (BDEsZPE) of a series of model N-nitrocompounds and typical energetic N-nitrocompounds have been calculated using density functional theory methods. Computed results show that using the 6-31G** basis set the UB3LYP calculated BDEZPE is similar to the B3PW91 but is less than the UB3P86 and that for both UB3P86 and UB3PW91 methods the 6-31G** calculated BDEZPE is close to the 6-31++G**. For the series of model N-nitrocompounds it is drawn from the NBO analysis that at the UB3LYP/6-31G** level the order of BDEZPE is not only in line with that of bond order but also with that of the energy gap between N-NO2 bond and antibond orbitals. For the typical energetic N-nitrocompounds the impact sensitivity is strongly related to the BDEZPE indeed, and based on the BDEsZPE calculated at different density functional theory levels this work has established a good multivariate correlation of impact sensitivity with molecular parameters, which provides a method to address the sensitivity problem. © 2009 Elsevier B.V. All rights reserved.


Miao C.,CAS Beijing Institute of Applied Physics And Computational Mathematics | Zheng X.,China Academy of Engineering Physics
Communications in Mathematical Physics | Year: 2013

In this paper, we investigate the Cauchy problem for the tridimensional Boussinesq equations with horizontal dissipation. Under the assumption that the initial data is axisymmetric without swirl, we prove the global well-posedness for this system. In the absence of vertical dissipation, there is no smoothing effect on the vertical derivatives. To make up this shortcoming, we first establish a magic relationship between ur/r and ωtheta/r by taking full advantage of the structure of the axisymmetric fluid without swirl and some tricks in harmonic analysis. This together with the structure of the coupling of (1.2) entails the desired regularity. © 2013 Springer-Verlag Berlin Heidelberg.


Li J.,China Academy of Engineering Physics
Journal of Hazardous Materials | Year: 2010

The ZPE-corrected X-NO2 (X=C, N, O) bond dissociation energies (BDEsZPE) of 11 energetic nitrocompounds of different types have been calculated employing density functional theory methods. Computed results show that using the 6-31G** basis set the UB3LYP calculated BDEZPE is less than the UB3P86. For these typical energetic nitrocompounds the shock-initiated pressure (P98) is strongly related to the BDEZPE indeed, and a polynomial correlation of ln(P98) with the BDEZPE has been established successfully at different density functional theory levels, which provides a method to address the shock sensitivity problem. © 2010 Elsevier B.V.


Zhang C.,China Academy of Engineering Physics
Journal of Molecular Modeling | Year: 2013

We provide a very simply way to understand the stress-induced activation of decomposition of organic explosives by taking the simplest explosive molecule nitromethane (NM) as a prototype and constraining one or two NM molecules in a shell to represent the condensed phrase of NM against the stress caused by tension and compression, sliding and rotational shear, and imperfection. The results show that the stress loaded on NM molecule can always reduce the barriers of its decomposition. We think the origin of this stress-induced activation is due to the increased repulsive intra- and/or inter- molecular interaction potentials in explosives resulted from the stress, whose release is positive to accelerate the decomposition. Besides, by these models, we can understand that the explosives in gaseous state are easier to analyze than those in condensed state and the voids in condensed explosives make them more sensitive to external stimuli relative to the perfect crystals. © 2012 Springer-Verlag.


Li J.,China Academy of Engineering Physics
Journal of Physical Chemistry B | Year: 2010

The ZPE-corrected C - NO2 bond dissociation energies (BDESZPE) of a series of model C-nitro compounds and 26 energetic C-nitro compounds have been calculated using density functional theory methods. Computed results show that for C-nitro compounds the UB3LYP calculated BDEZPE is less than the UB3P86 using the 6-3IG** basis set, and the UB3P86 BDE ZPE changes slightly with the basis set varying from. 6-31.G** to 6-31++G**. For the series of model C-nitro compounds with different chemical skeletons, it is drawn from NBO analysis that the order of BDEZPE is not only in line with that of the NAO bond order but also with that of the energy gap between C - NO2 bonding and antibonding orbitais, it is found that for the energetic C-nitro compounds whose drop energies (Esdr) are below 24.5 J a good linear correlation exists between Edr and BDEZPE, implying that these compounds ignite through the C - NO2 dissociation mechanism. After excluding the so-called trinitrotoluene mechanism compounds, a polynomial correlation of In(Edr) with the BDEZPE calculated at density functional theory levels has been established successfully for the 18 C - NO2 dissociation energetic C-nitro compounds. © 2010 American Chemical Society.


An logging method for locating a watered zone in a horizontal well with high watercut problem by isotope labeling is disclosed, which successively includes the following steps: a. solidifying an isotope used in an isotope releasing device into a water-soluble carrier; b. connecting the isotope releasing device with a tubing and setting them to a horizontal segment of the well; c. dissolving the water-soluble carriers in the water at the bottom of the well to release the isotope, wherein the releasing rate is proportional to the flow rate of the water; d. starting a lift-up pump and beginning a production logging; and e. continuously performing y-ray energy-spectrum analysis on produced water on the ground, so as to locate the watered zone of the horizontal well with high watercut problem by the detected species and characteristic content of the isotope. Since the isotope releasing device is conveyed through the tubing, various restrictions of borehole trajectories and wellbore conditions can be overcome, the risk in the process of operation can be reduced; and the logging method of the invention can be accomplished during pump checking operation, and does not need the coordination of a packer, bridge plug, the bottom of the well switch or other tools, thereby save the platform occupying time, and also save the logging cost.

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