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煤矿斜巷运输中发生的跑车事故,是斜巷运输过程中的一大安全隐患,着重探讨了如何科学合理地设置运用跑车防护装置,在斜巷运输过程中发挥作用,以使斜巷运输的跑车事故能够得以有效的预防。 相似文献
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针对大展弦比滑翔增程弹大侧滑飞行时滚转干扰力矩大,容易导致滚转舵饱和并造成滚转控制困难的问题,提出了大展弦比滑翔增程弹自动驾驶仪引入侧向加速度反馈的侧滑转弯(STT)控制方法。该方法通过在传统侧滑转弯自动驾驶仪的倾斜通道引入侧向加速度反馈,实现了倾斜角对侧向加速度的跟随,相当于在传统的侧滑转弯控制上增加了倾斜转弯(BTT)控制的效果。六自由度非线性仿真实验表明:大展弦比滑翔增程弹侧滑转弯自动驾驶仪倾斜通道引入侧向加速度反馈后,显著降低了飞行过程的侧滑角,使滚转舵偏远离饱和状态,提高了驾驶仪的滚转控制裕度。 相似文献
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滑动弧放电等离子体-溶液系统协同零价铁降解酸性橙Ⅱ 总被引:1,自引:0,他引:1
为探究等离子体-溶液系统联合零价铁(ZVI)Fenton反应对酸性橙Ⅱ(AOⅡ)的降解效果,考察ZVI对降解过程的促进作用及降解机理,建立了滑动弧等离子-溶液系统进行了实验研究。以质量浓度200 mg/L的AOⅡ为例,改变ZVI投加量分别为0、4、7、10、13 g。结果显示ZVI投加量为10 g时,AOⅡ的降解程度最高,为97.8%。等离子体-溶液系统中滑动弧放电产生的H2O2与加入的ZVI结合发生Fenton反应,AOⅡ降解过程遵守一级动力学规律。对比不加入ZVI时的AOⅡ反应速率常数,加入10 g ZVI后初始质量浓度为100、150、200、250、300 mg/L的AOⅡ反应速率常数分别提高了12.9%、31.0%、39.4%、44.3%、47.8%。溶液化学需氧量(COD)去除率也表明了在降解过程中加入ZVI能够有效地提高降解率。运用色谱-质谱联用仪(GC-MS)测定了AOⅡ的降解机理,认为*OH攻击AOⅡ分子上与萘环相连的—N N—键,导致—N N—键的断裂,并经过一系列的氧化过程后形成无机小分子物质。 相似文献
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Gliding arc gas discharge plasma was used for the generation of hydrogen from steam reforming of dimethyl ether (DME). A systemic procedure was employed to determine the suitable experimental conditions. It was found that DME conversion first increased up to the maximum and then decreased slightly with the increase of added water and air. The increase of total feed gas flow rate resulted in the decrease of DME conversion and hydrogen yield, but hydrogen energy consumption dropped down to the lowest as total feed gas flow rate increased to 76 ml. min^-1. Larger electrode gap and higher discharge voltage were advantageous. Electrode shape had an important effect on the conversion of DME and production of H2- Among the five electrodes, electrode 2# with valid length of 55 mm and the radian of 34 degrees of the top electrode section was the best option, which enhanced obviously the conversion of DME. 相似文献
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Noala Vicensoto Moreira Milhan William Chiappim Aline da Graa Sampaio Mariana Raquel da Cruz Vegian Rodrigo Svio Pessoa Cristiane Yumi Koga-Ito 《International journal of molecular sciences》2022,23(8)
The activation of water by non-thermal plasma creates a liquid with active constituents referred to as plasma-activated water (PAW). Due to its active constituents, PAW may play an important role in different fields, such as agriculture, the food industry and healthcare. Plasma liquid technology has received attention in recent years due to its versatility and good potential, mainly focused on different health care purposes. This interest has extended to dentistry, since the use of a plasma–liquid technology could bring clinical advantages, compared to direct application of non-thermal atmospheric pressure plasmas (NTAPPs). The aim of this paper is to discuss the applicability of PAW in different areas of dentistry, according to the published literature about NTAPPs and plasma–liquid technology. The direct and indirect application of NTAPPs are presented in the introduction. Posteriorly, the main reactors for generating PAW and its active constituents with a role in biomedical applications are specified, followed by a section that discusses, in detail, the use of PAW as a tool for different oral diseases. 相似文献
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The underwater thermal glider utilizes ocean thermal energy to change its buoyancy, which enables it to ascend and descend. A Phase Change Material (PCM) as the working fluid inside the thermal engine tubes is sensitive to the surrounding seawater temperature, whose effects are different with the various displacements and gliding angles of the glider. In this paper, the effects of the displacement and the gliding angle on the performance of the thermal engine were studied numerically and experimentally. On this basis, the ways to eliminate the negative effect of a thermocline on the performance of the thermal engine were obtained. The results show that the displacement and gliding angle affect the transition time of the PCM. There exist the threshold values of the displacement and gliding angle for the normal work of thermal engine. There are two means of eliminating the negative effect of a thermocline on the performance of the thermal engine and improving glider performance: one is to increase the displacement, and the other is to decrease the absolute value of the gliding angle. There is also another better way to improve glider performance. 相似文献