Different types of quotation 翻译结果4复制译文编辑译文朗读译文返回顶部 Different models of the quotation 翻译结果5复制译文编辑译文朗读译文返回顶部 Different model quoted price 相关内容 a关于你现在购买的产品,我们现在只有34尺寸,其他尺寸已经停止销售,如果尺寸不合适,我们将退款给你,感谢你的合作! Product purc...
Later, the notched delta fin model was mounted on these designed model rockets. The effects of this fin model on the changes in the speed, stability, acceleration, weight and altitude of the rockets were analyzed numerically in the OpenRocket program. As a result of the an...
This study was carried out from February - April, 1998 in order to investigate the effects of different salinity level of water solution on yield and quality of rocket. Rockets grown in a pot (700 cm2) were watered daily, with 7 different saline concentration of water which were 0.5 (as ...
1. Introduction Cylindrical shells are important structural elements widely used in various engineering applications ranging from outer space to deep oceans such as rockets, aircrafts, missiles, submarines and automobiles etc. In these applications the shell structures may encounter vibrations and as a ...
A single large LEO constellation will require anywhere from three to 40 launches a year (depending on the size of the constellation and rocket type), both initially and during maintenance. For constellation operators—even those that build their own rockets—these launch ...
Additionally, diesel can be used for micro-engines in various types of model aircraft or drones that fly at lower altitudes and do not pose a risk to diesel’s freezing point. More details about the properties of kerosene used in aviation turbomotors are standardized in ASTM D1655 [41], ...
Steady-state fluorescence measurements of the samples were performed in ethanol solutions, detecting the photoluminescence signal in a 90° configuration with a spectrofluorometer from Edinburgh Instruments Ltd. (Livingston, UK), model FLSP920 in the range 600–800 nm (excitation wavelength at 440 nm...
hybrid rockets; vortex injection; paraffin-based fuels; regression rate tailoring; low swirl numbers1. Introduction Hybrid rocket motor technology has advanced over the past decades, mainly trough ground research [1,2,3] but also flight testing [4], and it is now recognized as a potential ...