查询词典 oxygen gas

A novel thermoelectric film sensor for combustible gas was fabricated based on thermoelectric effect of thermoelectric materials and exothermic reaction of combustible gas with oxygen.

摘要基于热电效应和可燃气体氧化放热反应制备出一种新型的热电薄膜可燃气体传感器。

In the present study, tungsten oxide nanomaterials were synthesized by a modified plasma arc gas condensation technique. The effects of the plasma currents (70~90 A), chamber pressures (200~600 torr), production time（3~12 min）, oxygen partial pressure Ar:O2（1~6:1）and plasma including the hydrogen（0~10 %）on the preparation of tungsten oxide nanostructures were investigated. Pre-treatment on the tungsten oxide nanorods for surface modification was investigated by atmospherical plasma jet. The optical, filed emission, and gas sensing characteristics of tungsten oxide nanopowders were also examined.

本研究系利用电浆电弧气凝合成法来制备氧化钨奈米材料，分别探讨不同腔体压力（200~600 torr）、电浆电流（70~90 A）、制备时间（3~12 min）、氧分压Ar：O2（1~6：1）、电浆气含氢量（0~10 %）对於产物的形貌、相态影响，并使用常压低温电浆设备对氧化钨奈米棒进行表面处理，且针对氧化钨奈米材料的光学、场发射以及使用自行组装气体感测量测设备量测其气体感测特性。

Preparation of the cathode includes:shaping under the press of 40Mpa, sintering at 550℃for 1 hour and at 900℃for 8 hours and threading with molybdenum bar; Considering the literatures we choose CaCl2 as salt for preparation titanium. Pretreatment of salt is for 1 hour at 100℃and for 2 hours at 300℃. Partial pressure of oxygen which need lower than 5.11×10-7Pa to reduct titanium oxides and hygroscopic property of salt need a sealed equipment to electrolyse. And finally successfully designed a satisfied one and the results show that the equipment can be satisfied the requirment of the experiment. Flow of the inert gas is 1.5L/min, the voltage is 2.8 V, temperature is 850℃and time is 2 hours during pre-electrolysis. Flow of the inert gas is 0.2L/min, the voltage is 3.1 V, temperature is 900℃and time changes with the mass of TiO2 during electrolysis, namely the greater need the longer time; To eliminate influence of salt and other impurities, the products need to wash with distilled water and dilute chlorhydric acid , then wash with dilute hydrochloric acid under supersonic wave assistant. Finally, electrometical properties of the electrolysis of TiO2 is researched by cyclic voltammetry and chronoamperometry, and results show that there are two main reodox steps, namely from TiO2 to TiO and from TiO to Ti.

阴极制备主要包括40MPa压力下模压成型、两段式烧结(1小时内升至550℃保温1小时，再1小时升温至900℃保温8小时)及烧结后TiO2块打孔用钼棒串接三个主要环节；实验中选用CaCl2作为电解熔盐，并对其进行预处理(100℃，保温1小时； 300℃，保温2小时)；经热力学计算，还原钛氧化物的氧分压至少要低于5.11×10-7Pa，结合电解过程中所用熔盐CaCl2有极强的吸水性的特点，电解装置应有较高的密封性，自行设计了一套密封性可靠的电解装置，便于实验过程中熔盐预处理和氧分压的控制；通过干燥处理预电解过程中Ar流量大约为1.5L/min、电压为2.8 V、温度为850℃、时间为2小时，电解过程中Ar流量大约为0.2L/min、电压为3.1V、温度为900℃，实验结果表明电解时间与TiO2质量密切相关，质量越大需要电解的时间越长；通过自来水冲洗—稀盐酸浸泡、洗涤—在超声波辅助作用下稀盐酸洗涤，可减少熔盐及其它杂质对电解产物检测结果的影响；最后，通过循环伏安法、计时电流法对电解机理的研究，确定电解还原TiO2制备金属钛主要经历了TiO2-TiO-Ti的过程。

The traditional transformer online monitoring system generally adopts oxygen carrier gas, chromatographic column. And the equipment is not simple with many shortages such as periodic calibration of chromatography column and sensor, low reliability of equipments and overelaborate detection procedure of gas composition.

由于变压器传统的在线监测系统一般采用色谱柱，需要消耗氧气和载气，而且色谱柱和传感器需定期标定，装置可靠性不高，检测气体成分过程繁琐，因此第6章根据比尔-朗伯特(Beer-Lambert)定律，按照光纤气体差分吸收的原理，设计了一套基于光纤气体传感器的变压器在线监测系统。

The feature of the shaft furnace-iron bath smelter charging carbon-bearing pellets is that partial off-gas of shaft furnace is mixed with gas from smelter and then put into shaft for preheating and pre-reduction. The optimum operational parameter is at the point of prereduction degree of 52% and post-combustion degree of 32% where the coal consumption is 750kg/tone-hot metal and oxygen consumption is 420Nm〓/tone-hot metal.(5) The systematic simulation of rotary hearth furnace-iron bath smeter is firstly formulated.

4本文建立的含碳球团竖炉—铁浴工艺流程模型的特点之一是竖炉炉顶出口煤气的一部分与铁浴煤气混合后，重新进入竖炉，本文报道的对系统部分出口物流返回反应器的非序贯式流程进行的系统模拟，为今后类似问题的模拟提供了参考，本工艺的最低消耗点的操作条件是：预还原度52％，二次燃烧率32％，这时的最低煤耗为750kg／tFe（中挥发份煤VM=19％），氧耗约420Nm〓／tFe，对应于预还原度30～70％的优化组合的二次燃烧率为32～13％。

Owns the biggest PLG control of electrolysis of water gas production lines, the introduction of the United States Advanced trace oxygen analyzers and dewpoint meter, gas analyzer Pu color, perfect quality control system, high-end product quality more than 99.999%.

拥有目前国内最大的PLG控制电解水气体生产线，引进美国Advanced微量氧分析仪和露点仪，气相色普分析仪，完善的质量控制体系，高端产品质量达到99.999%以上。

Article 12 The design documents of boilers, gas cylinders in pressure vessels (hereinafter referred to as gas cylinders), oxygen chambers and passenger cableways, and large entertainment facilities may be used in the manufacturing only after being appraised by the inspection and testing institutions approved by the department of safety supervision under the State Council.

第十二条锅炉、压力容器中的气瓶、氧舱和客运索道、大型游乐设施的设计文件，应当经国务院特种设备安全监督管理部门核准的检验检测机构鉴定，方可用于制造。

The study focuses on transport phenomena of cathode gas diffusion layer of PEM fuel cell by using two-phase flow model. Liquid water saturation and oxygen concentration profile in gas diffusion layer and polarization curve are investigated by numerical simulations.

本研究主要探讨质子交换膜燃料电池阴极气体扩散层内的两相流传输现象，利用数值方法求解出燃料电池阴极气体扩散层内液态水饱和度分布、氧气浓度分布以及性能曲线。

Based on the traditional mechanical model the buble point method of three diagonal matrix, an neural network model of gas-liquid equilibrium computation for liquid air, which makes system presure P and equilibrium component of liquid phrase x1,x2,x3 as input nodes makes system temperature T, equilibrium component of gas nitrogen y1, equilibrium constant of argon and oxygen k2, k3 as output nodes, insteads of the buble point computation of the three diagonal matrix , thus a improved distillation model is built.

在传统的机理模型三对角矩阵法中的泡点法基础上，将体系压力P，平衡液相组成x1， x2， x3 为输入节点体系温度T ，平衡汽相氮组成y1 及氩、氧的相平衡常数k2， k3 为输出节点的神经网络液体空气汽液平衡计算模型，取代三对角矩阵法中泡点计算，从而建立改进的精馏塔模型改进模型用于空分塔的模拟计算，不仅计算速度快，计算结果与机理模型结果非常接近，且符合设计要求，对实现产品质量的在线监控具有一定的指导意义

Rotary vane vacuum pumps generally only suitable for extraction can be dry or contain a small amount of steam condensate gas (for the latter town gas valve must be installed), not suitable for oxygen extraction is too high, explosive, corrosive, oil-pumping effect on the chemical contain solid particles and gases.

旋片真空泵一般只适于抽除干燥或含有少量可凝性蒸汽的气体，不适于抽除含氧过高、爆炸性、腐蚀性、对泵油起化学作用和含有固体颗粒的气体。

Cynanchum Lingtai apricot production in the average weight 65 grams, the brightly-colored fruit, juicy rich, sweet-sour taste, sweet from the nucleolus, when the late Qing Dynasty famous Shaanxi, Gansu provinces, the Qing imperial court Tongzhi tribute for years.

灵台生产的牛心杏平均单果重65克，果实色泽鲜艳，汁多味浓，甜酸适口，离核仁甜，清末时就驰名陕、甘两省，清同治年间曾为朝廷贡品。

Chenopodium album,Solanum nigrum, and Amaranthus retroflexus were very susceptible to the herbicides. Polygonum persicaria and Abutilon theophrasti were relatively less susceptible to the herbicides, and Lycopersicon esculentum was not susceptible to it. The relationship between reduction rates of weed biomass and PPM values of weed leaves 2,4, and 6 days after treatment was established.

供试的6种杂草对该混剂的敏感性存在显著差异：红心藜Chenopodium album、龙葵Solanum nigrum和反枝苋Amaranthus retroflexus对该混剂最敏感，ED90值分别为47.65、71.67和29.17g/hm2；春蓼Polygonum persicaria和苘麻Abutilon theophrasti敏感，ED90值分别为96.91、114.20g/hm2；而番茄不敏感。