Royco 889 is a synthetic - based lubricant formulated for use in gas compression applications that require wide operating temperature ranges and minimun interaction between the lubricant and the process gas Royco 889是一种合成型的润滑油，专门设计用于需要宽工作温度范围且能最大程度上减少润滑油与气体反应的气体压缩过程。
As for it also has low working voltage and small power dissipation , it has became the ideal succedaneum of crt . furthermore , fed doesn ’ t need negative photo , large visual angle , wide working temperature extent 另外, fed不需背光、视角大、工作温度范围宽等优点也对目前平板显示器的主流产品有源矩阵液晶显示器提出了严峻的挑战。
The driver has the quiescent current under 1 a and also has soft - start circuitry to limit inrush current flow at power up . the chip can be operated normally in the temperature range of - 40 to 85 according to the simulation results . the brightness of the white leds can be controlled by using a dc voltage or a pwm signal applied to the pin with a few external components added 系统采用0 . 5 mcmos工艺;输入电压范围为2 . 7v到5 . 5v ;在关闭状态下消耗电流小于1 a ;具有软启动功能,可减小启动过程中的浪涌电流;具有短路及过热保护功能,工作温度范围为- 40至85 ; led亮度控制可以通过外加dc或pwm电压信号和很少的外部元件实现。
It works at high frequency with a selectable pin outside ; the working frequency is fixed at 640k / 1 . 2mhz . so far as the output signal of the single - chip ic is concerned , the maximum time proportion of its high level is 88 percent , but the minimum one is 10 percent 该控制器为pwm脉冲宽度调制方式;电路正常工作温度范围为- 20oc 85oc ;工作开关频率根据外围电路输出电压需要为640k / 1 . 2mhz可选;输出信号的最大占空比为90 % ,最小占空比为10 % ,芯片主要应用于lcd电压电源管理设备。
It possess many of the physical properties such as high atomic number ( z ) , large enough band gap , high resistivity , relatively low leakage currents , and high intrinsic mobility - lifetime ( ut ) product , which are required for room - temperature nuclear radiation detectors . so it is widely used in nuclear medical imaging system , space engineering , and astrophysics , environmental monitoring , and so on . in addition , it is the best substrate for lattice matched epitaxial growth of hg1 - xcdxte ( mct ) thin films and solar cells 用单晶czt制成的探测器可在室温下工作，工作温度范围宽( - 20 40 ) ，能量探测范围宽( 10kev 6mev ) ，对x射线、射线能量分辨率高，在x射线、射线成像、天体物理研究、工业探测、安全检测、核辐射探测、核废料监控、 x射线荧光分析( xrf ) 、 x射线断层扫描和核医学等方面有重要用途。
The chip is mainly applied to the portable electronic products with the following features : 2 . 7v to 5 . 5v input voltage range ; the 1mhz fixed frequency ; - 40 to + 85 operating temperature ; two digital inputs control on / off and select amongst three levels of brightness ; thermal shutdown and under voltage shutdown protection , low 0 . 1 a shutdown current ; soft - start limits inrush current 该芯片主要应用于便携式电子产品,其输入电压范围为2 . 7 5 . 5v ,工作频率为固定的1mhz ,可大幅度降低输入纹波和emi辐射,工作温度范围为- 40 + 85 ,可使用外部使能控制信号调节led亮度及控制芯片关断与否,具有过温保护和输入欠压关断保护功能,完全关断模式下关断电流可低至0 . 1 a ,具有软启动功能以限制启动时的浪涌电流。
The 1mhz fixed frequency switching allows for tiny external components and the regulation scheme is optimized to ensure low emi and low input ripple . an external resistor sets the full - scale led current , while two digital inputs control on / off and select amongst three levels of brightness . the circuit operates in 1x mode until just above dropout 工作在1mhz固定频率,采用线性调制模式使输入纹波大大减小;利用一个外部电阻可以设置满量程led电流;外接两个数字信号控制芯片开关并选择led三级亮度中的一级;具有过温、过压/欠压等保护功能,工作温度范围为- 40 + 85 。
This text completely and systematically studies the status and the development of the pyrolysis and the fluidization of biomass , which distill the bio - oil in the domestic and international area , as well as the existing problems . this thesis primarily include following aspects : ( l ) , by experimenting and measuring the energy ( heat value ) and the content of c , h , n chemical element of right 20 kinds of common biomass , on the base of the experimental result , and respectively established the biomass energy predict experiment formula with the element of h and c is from change , and passed the ro . os examination , which provides the basis and convenience for flash pyrolysis fluidization device energy to convert the rate to compute with biomass energy utilization calculation ; ( 2 ) , proceeded the tg and dtg experimentation equal velocity ( 10 ? / min , 20 ? / min , 40 ? / min , 60 ? / min ) heating and constant temperature heating by studying on eight kinds of biomass samples , according to the experimental data and arrhenius formula , we established the dynamics model of pyrolysis of , then , using the goast - redfern and p function , we also solved the dynamics parameters and analyze out every kind of biomass ' s frequency factor and parameters of activation energy , and established the every kind of dynamics model of pyrolysis of biomass , all of these provide the theories and basis to make sure the reactor ' s flash pyrolysis work temperature scope design and the describing of pyrolysis reactor dynamics ; ( 3 ) , in order to study and ascertain the process of heat completely getting to pyrolysis time of varied size biomass particles , we observed and measured the ratio of length and diameter ( l / d ) with the varied biomass through electron microscope , we concluded the l / d ratios usually is from 5 . 0 to 6 . 0 , the average is 5 . 3 ; ( 4 ) , we studied the process of biomass transiting and the theory of complete pyrolysis time with the theory of complicated heat field , we got the time ( t ) of the varied size biomass particles arriving to complete pyrolysis , and we knew that the complete pyrolysis time and the time which get to the biggest production ratio are identical , all of these studies provide the theory base for design and forecasting the flash pyrolysis reactor solid state resort time ; ( 5 ) , according to the above experiment result , synthesize to make use of the engineering the mechanics , engineering the material , machine the design to learn the principle , deduce , establish the theory of rotation cone flash pyrolysis reactor material resort time ( t ) and reasonable rotation velocity ( or frequency ) relation theory ; and ( 6 ) , we gave the reactor ' s smallest cone angle certain , reactor cone wall strength design theory , the reactor production ability theory , the power design method and the critical rotation velocity theory 本文较全面、系统地综述了国内外生物质热解液化制取生物燃油技术研究发展现状及存在的问题，主要研究内容有： ( 1 )实验、测定了20种常见生物质的能量(发热量)和c 、 h 、 n元素含量，根据实验结果分别建立了以h和c为自变量的生物质能量预测经验公式，并通过r _ ( 0 . 05 )检验；为闪速热解液化装置能量转化率计算和生物质能量利用率计算提供了依据和方便； ( 2 )选择了8种生物质试样作了等加热速率( 10 min 、 20 min 、 40 min 、 60 min )和恒温加热的tg和dtg实验，根据实验数据和阿伦尼乌斯公式建立了生物质热解反应动力学微分方程，并采用goast - redfem积分法和p函数对其动力学参数进行了求解，解析出各种生物质的频率因子和活化能参数，进而建立了各种生物质的热解动力学模型，为科学确定反应器的闪速热解工作温度范围及热解反应动力学描述，提供了理论和依据； ( 3 )为研究和确定不同尺度的生物质颗粒中心达到全热解的时间，在体视显微镜下对不同粒度的生物质颗粒的长径比进行了实验观察和测定，得出生物质的长径比( l d )一般在5 . 0 6 . 0之间，平均为5 . 3的结果； ( 4 )采用复杂温度场传热学理论对生物质传热过程及充分热解时间理论进行了研究，解析推导出了不同尺寸生物质颗粒中心温度达到充分热解温度的时间( t ) ，得出了理论推导的充分热解时间与最大产油率的热解时间相一致的结果，为闪速热解反应器固相滞留时间设计和预测提供了理论依据； ( 5 )根据上述实验结果，综合运用工程力学、工程材料、机械设计学原理，推导、建立了转锥式闪速热解反应器物料滞留时间( )与转速(或频率)合理匹配理论； ( 6 )提出了转锥式闪速热解反应器的最小锥角设计、锥壁强度设计、生产能力设计理论和功率计算方法及临界转速理论等。
The direct application of eftl is flat panel displays . it has several preferences , emissive , wide view angle , quick response , wide working temperature range , high pixel resolution , anti - strike , long life , less number of fabrication process etc . all these properties are better than plasma display fed and lc 它的主动显示、平板化、视角大、反应快、工作温度范围宽、像素鉴别率高、抗震动、寿命长、工序少等特点，都胜过液晶、等离子体、 lc等显示技术：第一章介绍了无机电致发光及有机电致发光的发展现状和存在问题。
This regulator can generate output voltage as high as 12v with wide input voltage range of 2 . 6v to 5 . 5v . it has the advantages of high - precision , simple circuit , low power consumption , wide temperature range of - 25 to 85 and 90 % high convert efficiency . at the same time , the ic has two switching frequencies ( 640khz or 1 . 2mhz selectable ) , under - voltage protection and programmable soft - start 该芯片采用0 . 6微米bcd工艺制程,在2 . 6v 5 . 5v的输入电压范围内可实现高达12v的升压功能,工作温度范围为- 25 85 ,转换效率达到90 % ,具有实现电路简单、输出电压精度高、功耗低等优点。
