2011年5月23日 星期一
2011年5月20日 星期五
東方人血壓基因---高血壓問題
台灣平均每四人就有一人有高血壓問題，未來可望透過基因篩檢，獲得更有效治療！中研院團隊已經找到五個東亞族群特有「血壓調節」相關基因，將可研發更適合東方人的治療藥物，有助發展個人化治療。這個研究登上國際重量級期刊「自然遺傳期刊」。
2011年5月19日 星期四
2011年5月16日 星期一
2011年5月15日 星期日
2011年5月13日 星期五
2011年5月11日 星期三
2011年5月9日 星期一
Laser Range Finder---A Development Diary
http://forums.parallax.com/showthread.php?126496-Joe-Grand-s-Laser-Range-Finder-A-Development-Diary
Hi all-
I originally mentioned that I was designing a low-cost Laser Range Finder (LRF) for Parallax back in their 2009 catalog. The project has been moving along sporadically in a vacuum since then and I thought it would be fun (and hopefully informative) to use this Forum thread as a way to keep folks updated with my progress and to solicit any comments along the way.
2011年5月8日 星期日
RS232 serial to USB converter
cable for interconnection of USB and RS232 serial interfaces
USB to serial converter (TTL, not RS232):
Escher 視覺的空間詭計
Maurits Cornelius Escher(1898-1972) 是一位荷蘭板畫家，專精於創造出複雜的畫面
結構與混淆視覺的圖案，尤以對於視覺的探索最為出色。
他的作品往往在挑戰人的視覺恆常性，常運用重覆的圖像、循環的動線，讓人的視線隨著他設定好的瀏覽途徑中發現意外。
結構與混淆視覺的圖案，尤以對於視覺的探索最為出色。
他的作品往往在挑戰人的視覺恆常性，常運用重覆的圖像、循環的動線，讓人的視線隨著他設定好的瀏覽途徑中發現意外。
2011年5月6日 星期五
2011年5月4日 星期三
Laser Pumped Flying Saucer Spacecraft
The "Lightcraft" is a laser-propelled spacecraft concept that could ultimately run on other beamed energies, such as microwave.
How to Reverse-Engineer a Satellite TV Smart Card
Notorious hacker Chris Tarnovsky opens his underground laboratory to Wired.com, providing a peek into the world of satellite TV smart-card hacking. This complicated process involves nail polish, a pin head and various acids -- so don't try this at home (unless you're Chris Tarnovsky)!
低雜訊InGaAs/InP APD讀出電路設計
0 引言
在紅外通信的1 310～1 550 nm波段，高靈敏度探測材料主要有Ge—APD和InGaAs／InP APD，兩者相比較，InGaAs／InP APD具有更高的量子效率和更低的暗電流雜訊。In 0.53G a 0.47A s／InP APD採用在n+-InP襯底上依次匹配外延InP緩衝層、InGaAs吸收層、InGaAsP能隙漸變層、InP電荷層與InP頂層的結構。APD探測器的最大缺點是暗電流相對于信號增益較大，所以設計APD讀出電路的關鍵是放大輸出弱電流信號，限制雜訊信號，提高信噪比。選擇CTIA作為讀出單元，CTIA是採用運算放大器作為積分器的運放積分模式，比較其他的讀出電路，優點是雜訊低、線性好、動態範圍大。
雪崩光電二極體反向電流的測量
基於ADL5317的APD偏壓控制／光功率監測電路的設計
2011年5月2日 星期一
有用LINK
Ссылка на файл
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Описание, как с ним работать
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Что-то полезное, вроде usb-usb моста /прислал dankib/
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ICEBERG прислал инфу по PSPICE моделям - качайте, узнавайте!
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Это тестер линка - показывает скорость и потери пакетов.
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Полезная программа, показывает схему лапок наших м/с, аналоги с импортом, очень простенькая! /от SADAT/
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Схемы типичных блоков питания компьютера - АТ и АТХ /от SADAT/
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| http://www.lazerlink.ru/1/father/soft/piatno.exe | Калькулятор зависимости размера пятна от дистанции и угла раскрыва луча. Внимание 380кБайт. |
| http://www.lazerlink.ru/1/father/soft/piatno.sfx.exe | То же - самораспаковывающийся зип 200кБайт |
| http://father.laserlink.org/ | База данных Paradox 7 для начинающих. Скриншоты с краткими описаниями. |
MEMS pressure sensors (MEMS 壓力感知器)
Barometric Pressure Sensor - BMP085 Breakout
click on the image to enlarge
sku: SEN-09694
Description: This is a simple breakout board for the BMP085 high-precision, low-power barometric pressure sensor. The BMP085 offers a measuring range of 300 to 1100 hPa with an absolute accuracy of down to 0.03 hPa. It's based on piezo-resistive technology for EMC robustness, high accuracy and linearity as well as long term stability. This sensor supports a voltage supply between 1.8 and 3.6VDC. It is designed to be connected directly to a micro-controller via the I²C bus
This breadboard-friendly board breaks out all pins of the BMP085 to a 6-pin 0.1" pitch header. The analog and digital supplies (VDDD and VDDA) of the BMP085 are tied together and broken out to a single pin. We've also put two 4.7k pull-up resistors on the I2C lines.
Features:
- Digital two wire (I2C) interface
- Wide barometric pressure range
- Flexible supply voltage range
- Ultra-low power consumption
- Low noise measurement
- Fully calibrated
- Temperature measurement included
- Ultra-flat, small footprint
Dimensions:
- 0.65 x 0.65" (16.5 x 16.5 mm)
Documents:
- Schematic
- Datasheet
- Eagle Files
- Quickstart Guide
- Example Arduino Sketch
- Example Code (ATmega328)
- Product Flyer
- SFE Eagle Library has this part!
- Wiring Example
- mbed User Review
http://www.bosch-sensortec.com/content/language1/html/3477.htm
BMP085 – digital barometric pressure sensor
The BMP085 is a high-precision, ultra-low power barometric pressure sensor for use in advanced mobile applications. It offers superior performance with an absolute accuracy of down to 0.03 hPa and using very low power consumption down to 3 µA.
The BMP085 comes in an ultra-thin, robust 8-pin ceramic lead-less chip carrier (LCC) package, designed to be connected directly to a micro-controller of a mobile device via the I²C bus. The footprint of BMP085 is 5 mm * 5 mm, height 1.2 mm.
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Pressure sensors for various applications
Since 1995 Bosch has produced more than 100 million micromechanical pressure sensors. They have proven highest quality standards in the field.
The monolithically integrated silicon pressure sensor is a smart high precision measurement device. The sensor element with evaluation circuit is fully calibrated and tested. It is available in different housings.
The sensors can measure pressure ranges from ± 2.5 kPa (relative) up to 3.3 MPa (absolute). The outstanding accuracy of down to 0.25% and their high robustness make the sensors ideal for applications like
• GPS navigation enhancement
• In- and outdoor navigation
• Leisure, sports and health monitoring
• Weather forecast
• Vertical velocity indication (rise/sink speed)
• Fan power control
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