Wyniki wyszukiwania - BazTech

1

Fabrication of Nano- and Micron- Sized Spheres of CL-20 by Electrospray

Yan S., Li M., Sun L., Jiao Q., Huang R.

Central European Journal of Energetic Materials

|

2018

|

Vol. 15, no. 4

572--589

EN

The application of hexanitrohexaazaisowurtzitane (CL-20) in energetic materials will be expanded by its use as superfine particles. A method of fabricating nano- and micron-sized spheres of CL-20 by using electrospray is discussed. The effects of the precursor solution and the experimental conditions on the morphology and the crystal phase of the CL-20 particles are introduced. A variety of solvents was used to dissolve raw CL-20 for the preparation of the precursor solution with different CL-20 contents. The conductivity and viscosity of the precursor solutions were tested before the electrospray process. The electrostatic parameters were adjusted by changing the voltage and the distance between the nozzle and the plate. The morphology, crystal phase, mechanical sensitivity, density, and thermal stability of the raw CL-20 and the as-sprayed CL-20 samples were determined using scanning electron microscopy, X-ray diffraction, and differential scanning calorimetry (DSC). Furthermore, the density and the mechanical sensitivity were tested for the raw and the as-sprayed CL-20. DSC tests were conducted to compare the thermal stability and reactivity of the samples.

2

Gradual late stage deepening of Gega ice-dammed lake, Tsangpo gorge, southeastern Tibet, indicated by preliminary sedimentary rock magnetic properties

Liu W., Zhou G. G. D., Ge Y., Huang R.

Acta Geophysica

|

2018

|

Vol. 66, no. 5

907--914

EN

Gega lake, in southeastern Tibet, was formed by the blocking of Yarlung Tsangpo gorge by a glacier and is a well-known example of geomorphological damming. However, the evolution of the damming process at the site is still not understood in detail. Here, we use measurements of multiple magnetic parameters of the sediments from the Yusong (YS) 3 section, which is well-dated by optically stimulated luminescence, to provide a detailed history of the late stage of Gega dammed lake since 17.0 ka. Low-frequency field magnetic susceptibility (χlf) increases upwards gradually from 25 to 79 × 10−8 m3/kg above 5.5 m, but other magnetic properties, such as frequency-dependent magnetic susceptibility (χfd % and χfd), susceptibility of anhysteretic remanent magnetization (χARM), and saturation isothermal remanent magnetization (SIRM) did not show a similar degree of enhancement. The magnetic grain size indicators of χARM/χlf, χARM/SIRM, and χlf/SIRM all indicate a trend of increasing magnetic grain size from the 5.5 m to the top of section; however, the bulk sediment grain size decreases gradually within the same interval. The total organic carbon is very low (0.2–0.7%), and thus, it is unlikely that the sedimentary environment is sufficiently strongly reducing to lead to the dissolution of magnetic minerals. Therefore, we infer that the coarsening-upwards of the magnetic grain size, and the increasing magnetic susceptibility from 5.5 m, reflect the gradual preferential preservation of magnetic minerals, caused by the deepening of the lake. Thus, we interpret the magnetic record of the section as reflecting the gradual deepening of the late stage of Gega ice-dammed lake. Last, the abrupt disappearance of the lake may have resulted in an outburst flood.

3

Apply to the Township's Small Substation

Ding S., Xiao L., Huang R., Liu J., Yang S., Chai X.

Przegląd Elektrotechniczny

|

2013

|

R. 89, nr 3b

13--14

EN

This paper designed a small terminal of a 35kV substation; it can meet the substation area electricity and the future development of the needs of the vision of growth in electricity demand. The article presents the design of transformers, substation main connection, and lightning protection. The practice shows that it applies to the township (town) of agricultural load and small-scale processing enterprises in electricity.

PL

W artykule przedstawiono projekt przyłącza podstacji elektroenergetycznej 35kV. W opisie uwzględniono projekt transformatorów, głównego przyłączenia podstacji oraz ochronę odgromową. W praktycznym ujęciu, projekt może mieć zastosowanie w rejonach agroturystycznych i niewielkich zakładach.

4

Intelligent Digital Multi-purpose Vehicle Instrument

Ding S., Li J., Xiao L., Huang R., Yang S.

Przegląd Elektrotechniczny

|

2012

|

R. 88, nr 5b

64-67

EN

This paper analyzed and studied the development and needs of the vehicle instrument. By the electronic circuit and microcontroller technologies it achieved the high-precision digital display of the speed, and the mileage and the fuel, and also this vehicle instrument realized the function of password protection, and alcohol concentration detection and reversing radar measuring the distance. Practice shows that the digital vehicle instrument has an intuitive digital display and high intelligence.

PL

Przedstawiono nowy inteligentny mikroprocesorowy instrument pokładowy samochodu. Instrumetn pozwala nie tylko mierzyć prędkość i dystans, ale także wykrywa obecność alkoholu i działanie radaru.

5

Numerical simulation on mining effects of upper coal seam on lower coal seam of splitting area of splitting and merging coal seam

Zha W. H., Hua X. Z., Xiong L. J., Huang R.

AGH Journal of Mining and Geoengineering

|

2012

|

Vol. 36, no. 3

471-479

EN

The main mining coal seams 71 and 72 of Huaibei mine area show a relation between splitting and merging. Under the slicing mining circumstance of the splitting area, it is the key problem to face the mining area to ensure the safety of the lower 72 coal mining. Based on face 7225 of Xutuan Coal Mine the influence of 71 coal seam mining on the coal seam 72 was analyzed by the FLAC3D. The law of stress propagation in the floor, failure extent and movement during the mining of coal seam 71 and coal seam 72 were studied by the numerical simulation; it provides the basis for roof management and support selection of 72 coal seam mining.

PL

Główne pokłady węglowe nr 71 i 72 kopalni Huaibei wykazują cechy zarówno rozszczepienia, jak i scalania. Podczas wybierania warstwowego na obszarze rozszczepienia głównym problemem jest zapewnienie bezpieczeństwa dolnego pokładu nr 72. Na przykładzie przodka 7225 kopalni Xutuan przeanalizowano wpływ wydobycia w pokładzie nr 71 na pokład nr 72 przy użyciu programu FLAC3D. Propagację fal naprężeń w spągu, zakres pęknięcia i przesunięcia podczas wybierania pokładu węgla nr 71 i 72 zbadano za pomocą symulacji numerycznej, co daje podstawy do lepszej kontroli stropu i do wyboru obudowy pod wybieranie pokładu węgla nr 72.