Lookup a chemical element based on Symbol, name, or atomic number
標(biāo)簽： chemical element Lookup Symbol
上傳時(shí)間： 2013-12-12
上傳用戶：TRIFCT
Flowlive The thermo library provides thermodynamical, chemical and physical properties of elements and species.
標(biāo)簽： thermodynamical properties Flowlive chemical
上傳時(shí)間： 2014-01-17
上傳用戶：cc1
it is about award winners in chemical industry
標(biāo)簽： chemical industry winners about
上傳時(shí)間： 2017-05-02
上傳用戶：zhangjinzj
The planarization technology of chemical-Mechanical-Polishing (CMP), used for the manufacturing of multi- level metal interconnects for high-density Integrated Circuits (IC), is also readily adaptable as an enabling technology in MicroElectroMechanical Systems (MEMS) fabrication, particularly polysilicon surface micromachining. CMP not only eases the design and manufacturability of MEMS devices by eliminating several photolithographic and film issues generated by severe topography, but also enables far greater flexibility with process complexity and associated designs. T
標(biāo)簽： mechanical polishing chemical
上傳時(shí)間： 2020-06-06
上傳用戶：shancjb
Road vehicles — Environmental conditions and testing for electrical and electronic equipment — Part 5：chemical loads（EN）ISO16750-5 道路車輛-電氣和電子設(shè)備的環(huán)境條件和測(cè)試 第5部分：化學(xué)負(fù)荷
標(biāo)簽： iso16750 道路車輛 化學(xué)負(fù)載
上傳時(shí)間： 2021-10-31
上傳用戶：
A light-emitting diode (LED) is a semiconductor device that emits narrow-spectrum incoherent light when forward-biased.The color of the emitted light depends on the chemical composition of the semiconductor material used, and can benear-ultraviolet, visible or infrared. LEDs are more prevalent today than ever before, replacing traditional incandescent andfluorescent bulbs in many lighting applications. Incandescents use a heated filament, are subject to breakage and burnoutand operate at a luminous efficiency of 2% to 4%. Fluorescents are more efficient, at 7% to 12%, but require highdrive voltage and contain mercury, a toxic substance that may be eventually banned in certain countries. LEDs, however,produce light directly through electroluminescence, operate at low voltage and can deliver over 20% luminous efficiency.
上傳時(shí)間： 2013-11-07
上傳用戶：xiaoyuer
為了提高PCB板制作的效率，改變傳統(tǒng)的化學(xué)腐蝕制板工藝，使用機(jī)械仿形銑制作電路板的方法，設(shè)計(jì)了以ATMEGA16單片機(jī)為核心部件的PCB板雕刻機(jī)控制系統(tǒng)。其中包括PCB雕刻機(jī)的基本功能、主要硬件電路設(shè)計(jì)和軟件的實(shí)現(xiàn)流程，并給出了相關(guān)設(shè)計(jì)電路。重點(diǎn)分析了雕刻機(jī)步進(jìn)電機(jī)的驅(qū)動(dòng)電路以及主軸電機(jī)的驅(qū)動(dòng)電路，該雕刻機(jī)經(jīng)實(shí)際運(yùn)行，系統(tǒng)工作良好，可有效提高PCB板的制作效率。 Abstract: In order to improve the efficiency of production of PCB board and change the traditional chemical etching plates， using of mechanical copying milling method makes circuit boards，this paper introduces the PCB engraving machine control system used ATMEGA16 microcomputer as the core components. It includes basic function， the hardware circuit design and software realization process， and gives the corresponding circuit design.It analyses the drive circuit of engrawing machine stepper motor and spindle motor in detail. This engraving machine by practical operation， the system works well， which can effectively improve the production efficiency of PCB board.
上傳時(shí)間： 2013-10-17
上傳用戶：liangliang123
為了提高傳統(tǒng)溫度控制系統(tǒng)的性能，將PID控制理論與嵌入式系統(tǒng)相結(jié)合，采用瑞薩電子公司的H8S/2166作為核心處理器，AD公司的AD7705以及熱敏電阻溫度傳感器作為溫度檢測(cè)單元，利用4×6小鍵盤、LCD顯示器和S1D13305液晶控制器達(dá)到良好的人機(jī)交互，設(shè)計(jì)出了一個(gè)應(yīng)用于化工領(lǐng)域的嵌入式實(shí)時(shí)溫度控制系統(tǒng)。相比于傳統(tǒng)溫度控制系統(tǒng)，該系統(tǒng)提供了更強(qiáng)的計(jì)算能力和可擴(kuò)展能力，采用增量PID控制算法實(shí)現(xiàn)復(fù)雜控制。通過(guò)實(shí)驗(yàn)，該系統(tǒng)能達(dá)到0.1 ℃的溫度控制精度以及小于120 s的溫度穩(wěn)定時(shí)間。 Abstract: In order to improve the performance of conventional temperature control system， combining PID control theory with embedded systems， using the Renesas Electronics Corp. H8S/2166 micro-controller as a core processors， AD7705 and thermistor temperature sensor as a temperature detection unit and 4×6 small keyboard， LCD and S1D13305 LCD controller as a good human-computer interaction， this paper designed an embedded real-time temperature control system which is applied in chemical industry. Compared with conventional temperature control system， this system provides more computing power and extensibility， and adopts PID control algorithm for complex control. Through the experiment， the system can reach temperature control accuracy of 0.1 ℃ and temperature stabilization time of less than 120 seconds.
標(biāo)簽： 瑞薩電子 微控制器 溫度控制 系統(tǒng)設(shè)計(jì)
上傳時(shí)間： 2014-12-26
上傳用戶：003030
Physics-Based Modeling Methods Improve Control System Design Multidomain systems (mechanical, electrical, hydraulic, chemical) Successful controller development requires thorough and accurate understanding of plantControllerElectricalMechanicalDeviceActuatorsSensorsPlant
標(biāo)簽： Physics-Based Multidomain mechanical Modeling
上傳時(shí)間： 2015-10-13
上傳用戶：xaijhqx
This book describes the applications of the fundamental interactions of electromagnetic waves and materials as described in the preceding volume, “Basic Electromagnetism and Materials”. It is addressed to students studying masters or doctorate courses in electronics, electromagnetism, applied physics, materials physics, or chemical physics. In particular, this volume analyzes the behavior of materials in the presence of an electromagnetic field and related applications in the fields of electronics, optics, and materials physics.
標(biāo)簽： Electromagnetism Materials Applied and
上傳時(shí)間： 2020-05-26
上傳用戶：shancjb
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