In the last year, we've gone from millions of pieces of data to billions of pieces of data. I will speak on a solution for scaling up and about the challenges presented. Also covered will be the future of data at Qihoo 360 with MongoDB.
Flame photometry (more accurately called Flame Atomic Emission Spectrometry)is a branch of spectroscopy in which the species examined in the spectrometer are in the form of atoms
A photoelectric flame photometer is an instrument used in inorganic chemical analysis to determine the concentration of certain metal ions among them sodium, potassium, calcium and lithium.
Flame Photometry is based on measurement of intensity of the light emitted when a metal is introduced into flame.
The wavelength of colour tells what the element is (qualitative)
The colour's intensity tells us how much of the element present (quantitative)
In the last year, we've gone from millions of pieces of data to billions of pieces of data. I will speak on a solution for scaling up and about the challenges presented. Also covered will be the future of data at Qihoo 360 with MongoDB.
Flame photometry (more accurately called Flame Atomic Emission Spectrometry)is a branch of spectroscopy in which the species examined in the spectrometer are in the form of atoms
A photoelectric flame photometer is an instrument used in inorganic chemical analysis to determine the concentration of certain metal ions among them sodium, potassium, calcium and lithium.
Flame Photometry is based on measurement of intensity of the light emitted when a metal is introduced into flame.
The wavelength of colour tells what the element is (qualitative)
The colour's intensity tells us how much of the element present (quantitative)
HPLC Principle,Instrumentation and ApplicationAlakesh Pradhan
HPLC Chromatography and its principle
Liquid chromatography
High Performance Liquid Chromatography ( HPLC )
The components of the high performance liquid chromatograph (HPLC).
The separation process.
The chromatogram
share the common java memory problem cases solutions,including:
1. java.lang.OutOfMemoryError
2. full gc frequently
3. cms gc error: promotion failed or concurrent mode failure
10. JVM堆:分代 -Xmn New Generation Eden S0 S1 Old Generation -XX:SurvivorRatio 备注:通常将对新生代进行的回收称为Minor GC;对旧生代进行的回收称为Major GC,但由于 Major GC除并发GC外均需对整个堆进行扫描和回收,因此又称为Full GC。
110. 旧生代可用GC—并发 Initial Marking(Stop-the-world) mark下root set直接引用的对象 Concurrent Marking并发标识上面mark出来的对象的引用; Mod Union Table Minor GC同时进行,有可能会导致旧生代引用的对象关系改变 Card Table旧生代中的对象引用关系也有可能改变