An Empirical Test of Beijing Industry Transfer Policy

Feng, Lei; Zhang, Kun; Yu, Yingmin; Jia, Zuo

doi:10.1007/978-981-15-5682-1_21

Cited by 2 publications

(4 citation statements)

References 1 publication

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“…The corner turn ability of the detonation wave is a key factor for determining whether an explosive can be applied in an explosive circuit. According to the detonation theory , when the detonation wave reaches the corner, a cluster of central expansion waves propagates from the corner, weakens the intensity of the detonation wave and reduces the velocity. In the process of a diffraction detonation wave, the area of the front of the shock wave increases suddenly, and the intensity decreases, thus the chemical reaction of the lower explosive is retarded, and the reaction zone lengthens.…”

Section: Resultsmentioning

confidence: 99%

“…Under specific conditions, detonation can be reformed again. However, when the energy of the diffraction detonation wave is inadequate to initiate detonation, it acts as a preloading effect on the explosive, and reduces the sensitivity of the explosive due to the density increase in the unexploded area, the so‐called “dead zone” . Based on this idea, we designed an explosive circuit with multiple 90° angles.…”

Section: Resultsmentioning

confidence: 99%

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Formulation of CL‐20‐Based Explosive Ink and Its Detonating Transfer Performance in Micro‐Size Charge

Peng

et al. 2019

Propellants Explo Pyrotec

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Explosive ink in the micro-size charges of explosive circuits for energetic devices has attracted considerable interest. Herein, explosive ink with 90 wt.% of energetic solid was selected by testing the rheological properties of formulations with different CL-20 concentrations. Explosive ink suspensions with sub-micro 4,6,8,10,4,6,8,10, as main explosive and fluorine-containing rubber/polyvinyl alcohol (PVA) emulsion as binder system were prepared. Direct ink writing (DIW) technology was used for the printing of the sample and for the loading of the explosive ink in a micro-size groove. The morphology and crystal type of the CL-20-based composite samples were characterized by SEM and XRD, and its detonating transfer performance in the micro-size groove were tested. Results show that the CL-20based composite has a good molding effect, and the crystal type has not changed. The critical detonation thickness is around 11 μm at 1.0 mm fixed width in the wedge tests, and the critical detonation size (cross section) is about 0.3 mm × 0.3 mm. The detonation wave could continue to propagate around multiple 90°corners. The maximum corner turning ability of the detonation wave is 140°and the CL-20-based composite can detonate completely in a complex charge circuit.Keywords: CL-20 · explosive ink · detonating transfer performance · corner turning ability · micro-size detonation Figure 6. (a) Optical image of explosive circuit charges with multiple 90°corner before detonation; (b) Optical image of charge substrate after detonation.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Formulation of CL‐20‐Based Explosive Ink and Its Detonating Transfer Performance in Micro‐Size Charge

Peng

et al. 2019

Propellants Explo Pyrotec

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“…The non-canonical Hamiltonian systems are generalizations of the canonical Hamiltonian systems. [1,[14][15][16][17][18] They have noncanonical symplectic structures which are preserved by the K-symplectic methods. K-symplectic methods exhibit advan-tageous energy preservation properties just like the symplectic methods [3,[19][20][21][22][23] for Hamiltonian systems.…”

Section: Introductionmentioning

confidence: 99%

“…One approach to constructing K-symplectic methods for a non-canonical system is to transform the system to a canonical one by a coordinate transformtion [1,14] and use the symplectic method. The other approach is the generating function method, [15,24] but it is also inevitable to seek for one coordinate transformation. To avoid the difficulty of finding the coordinate transformation, we prefer to use the splitting method for the non-canonical Hamiltonian systems.…”

Section: Introductionmentioning

confidence: 99%

Explicit K-symplectic methods for nonseparable non-canonical Hamiltonian systems

Zhu¹,

Ji²,

Zhu³

et al. 2023

Chinese Phys. B

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We propose efficient numerical methods for nonseparable non-canonical Hamiltonian systems which are explicit, K-symplectic in the extended phase space with long time energy conservation properties. They are based on extending the original phase space to several copies of the phase space and imposing a mechanical restraint on the copies of the phase space. Explicit K-symplectic methods are constructed for two non-canonical Hamiltonian systems. Numerical tests show that the proposed methods exhibit good numerical performance in preserving the phase orbit and the energy of the system over long time, whereas higher order Runge-Kutta methods do not preserve these properties. Numerical tests also show that the K-symplectic methods exhibit better efficiency than the same order implicit symplectic, explicit and implicit symplectic methods for the original nonseparable non-canonical systems. On the other hand, the fourth order K-symplectic method is more efficient than the fourth order Yoshida’s method, the optimized partitioned Runge-Kutta and Runge-Kutta-Nyström explicit K-symplectic methods for the extended phase space Hamiltonians, but less efficient than the the optimized partitioned Runge-Kutta and Runge-Kutta-Nyström extended phase space symplectic-like methods with the midpoint permutation.

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An Empirical Test of Beijing Industry Transfer Policy

Cited by 2 publications

References 1 publication

Formulation of CL‐20‐Based Explosive Ink and Its Detonating Transfer Performance in Micro‐Size Charge

Formulation of CL‐20‐Based Explosive Ink and Its Detonating Transfer Performance in Micro‐Size Charge

Explicit K-symplectic methods for nonseparable non-canonical Hamiltonian systems

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