Crankcase dilution is a phenomenon in engines where accumulation of unburned gasoline in the crankcase, an excessively rich fuel mixture or poor combustion allows a certain amount of gasoline to pass down between the pistons and cylinder walls and dilute the engine oil.
Nepanagar November 16, 2009
Nepanagar is a city and a municipality in Burhanpur district in the Indian state of Madhya Pradesh. Nepanagar is famous for its newspaper paper mill, Nepa Mills Limited (earlier known as The National News Print Ltd). It is also notable for its small railway station on the central railway between Burhanpur and Khandwa.
Drainage November 8, 2009
Drainage density is the total length of all the streams and rivers in a drainage basin divided by the total area of the drainage basin. It is a measure of how well or how poorly a watershed is drained by stream channels. It is equal to the reciprocal of the constant of channel maintenance and equal to the reciprocal of two times the length of overland flow.
Drainage Patterns
Figure 18.4 Aerial photograph illustrating typical dendritic drainage pattern developed in an area underlain by Gila conglomerate. Gila County, Arizona.(Courtesy USGS DDS21) Click image to enlarge
Over time, a stream system achieves a particulardrainage pattern to its network of stream channels and tributaries as determined by local geologic factors. Drainage patterns or nets are classified on the basis of their form and texture. Their shape or pattern develops in response to the local topography and subsurface geology. Drainage channels develop where surface runoff is enhanced and earth materials provide the least resistance to erosion. The texture is governed by soil infiltration, and the volume of water available in a given period of time to enter the surface. If the soil has only a moderate infiltration capacity and a small amount of precipitation strikes the surface over a given period of time, the water will likely soak in rather than evaporate away. If a large amount of water strikes the surface then more water will evaporate, soaks into the surface, or ponds on level ground. On sloping surfaces this excess water will runoff. Fewer drainage channels will develop where the surface is flat and the soil infiltration is high because the water will soak into the surface. The fewer number of channels, the coarser will be the drainage pattern.
Figure 18.5 Dendritic drainage pattern
A dendritic drainage pattern is the most common form and looks like the branching pattern of tree roots. It develops in regions underlain by homogeneous material. That is, the subsurface geology has a similar resistance to weathering so there is no apparent control over the direction the tributaries take. Tributaries joining larger streams at acute angle (less than 90 degrees). 
Figure 18.6 Parallel drainage pattern
Parallel drainage patterns form where there is a pronounced slope to the surface. A parallel pattern also develops in regions of parallel, elongate landforms like outcropping resistant rock bands. Tributary streams tend to stretch out in a parallel-like fashion following the slope of the surface. A parallel pattern sometimes indicates the presence of a major fault that cuts across an area of steeply folded bedrock. All forms of transitions can occur between parallel, dendritic, and trellis patterns. 
Figure 18.7 Trellis Drainage Pattern
Trellis drainage patterns look similar to their namesake, the common garden trellis. Trellis drainage develops in folded topography like that found in the Appalachian Mountains of North America. Down-turned folds called synclines form valleys in which resides the main channel of the stream. Short tributary streams enter the main channel at sharp angles as they run down sides of parallel ridges called anticlines. Tributaries join the main stream at nearly right angles. 
Figure 18.8 Rectangular Drainage Pattern
The rectangular drainage pattern is found in regions that have undergone faulting. Streams follow the path of least resistance and thus are concentrated in places were exposed rock is the weakest. Movement of the surface due to faulting off-sets the direction of the stream. As a result, the tributary streams make shape bends and enter the main stream at high angles.
View an offset stream along the San Andreas Fault in Google Earth.
Figure 18.9 Radial Drainage Pattern
The radial drainage pattern develops around a central elevated point. This pattern is common to such conically shaped features as volcanoes. The tributary streams extend the headward reaches upslope toward the top of the volcano.
Figure 18.10 Centripetal Drainage Pattern
The centripetal drainage pattern is just the opposite of the radial as streams flow toward a central depression. This pattern is typical in the western and southwestern portions of the United States where basins exhibit interior drainage. During wetter portions of the year, these streams feed ephemeral lakes, which evaporate away during dry periods. Salt flats are created in these dry lake beds as salt dissolved in the lake water precipitates out of solution and is left behind when the water evaporates away.
Figure 18.11 Deranged Drainage Pattern
Deranged or contorted patterns develop from the disruption of a pre-existing drainage pattern. Figure 18.11 began as a dendritic pattern but was altered when overrun by glacier. After receding, the glacier left behind fine grain material that form wetlands and deposits that dammed the stream to impound a small lake. The tributary streams appear significantly more contorted than they were prior to glaciation. 
The patterns described above are accordant, or correlated with the structure and relief over which they flow. Those streams that are discordant with the rocks over which they flow are either antecedent or superimposed. For instance, antecedent streams flowed across bedrock structures prior to uplift. Slow mountain building permitted stream erosion to keep pace with uplift. Such appears to be the case for the Columbia River that cuts across the Cascade Mountains. Streams in portions of the Appalachian Mountains have formed in weaker rock that through time has eroded away. These streams appear to be superimposed over the rock layers that they presently flow over. The Cumberland Gap is a famous water gap formed in this way as it cuts through the folds of the Appalachians.
Source–http://www.uwsp.edu/geo/faculty/ritter/geog101/textbook/fluvial_systems/drainage_patterns.html
Concepts November 8, 2009
Ecotone November 7, 2009
An ecotone is a transition area between two adjacent but different plant communities, such as forest and grassland. It may be narrow or wide, local(the zone between a field and forest) or regional(the transition between forest and grassland)(Smith).It may appear on the ground as a gradual blending of the two communities across a broad area, or it may manifest itself as a sharp boundary line.
November 7, 2009
City of the Golden Gate — Sanfrancisco
City of Golden Temple — Amristar
City of Dreaming Spires — Oxford
City of Magnificient Distance — Washington D.C
City of Skyscrapers — Newyork
City of Palaces — Kolkata
City of Gardens — Chicago
bladeaxe4 " Bhuvan " – India’s Very Own Google Earth READY ! September 5, 2009
As announced earlier India’s own geographic information system (GIS) dubbed ‘Bhuvan‘ is now available for download, currently under BETA release capable of Indian specific features not available in any other competing product.
Bhuvan features multiple layers of information showing topography, altitude, depth weather and other features helpful in managing public services, internal security, town planning, and infrastructure development activities.
These ppl died in Aviation accidents September 5, 2009
-
Sanjay Gandhi 
IND1980 son of Indira Gandhi Pitts S-2A Special India Jayan IND1980 entertainer: Malayalam film actor accident whilst performing a film stunt. Madhavrao Scindia IND2001 Indian politician Y.S. Rajasekhara Reddy IND2009 Chief Minister of Andhra Pradesh, India Bell 430 Nallamala, India Soundarya IND2004 Kollywood (Tamil) actress Ganapathi Thanikaimoni IND1986 Palynologist Pan Am Flight 73 G. M. C. Balayogi IND2002 politician helicopter Kaikalur, West Godavari district ?? Neerja Bhanot IND1986 flight attendant who saved lives during a hijacking Pan Am Flight 73 Karachi, Pakistan Hijacking Subhash Chandra Bose IND1945 Indian politician and Freedom fighter Taiwan (alleged) Cause disputed
National income September 3, 2009
Concept of national income PER CAPITA INCOME = NATIONAL INCOME/ POPULATION PPP PURCHASING POWER PARTY INDEX IS CONSTRUCTED BY TAKING INTO ACCOUNT WHAT A UNIT CURRNCY CAN PURCHASE IN ITS OWN COUNTRY PLANNING IN INDIA HISTORICAL BACKGROUND 1. 1934 M.VISVESHVARYA WROTE THE BOOK PLLANED ECONMY 4 INDIA 2. 1938 NATIONAL PLANNING COMMETEE SET UP 3. 1944 BOMBAY PLAN BY 8 INDUSTRIALIST IN BOMBAY 4. 1945 PEOPLE’S PLAN BY MN ROY 5. 1950 SARVODYA PLAN BY JP NARAYAN PLANNING COMMISSION
What Is a Black Box? September 3, 2009
What Is a Black Box?
When an aviation accident occurs, officials usually begin their investigation by attempting to locate recording devices commonly known as black boxes. The devices record not only the conversations of the pilots and air traffic controllers, but also track details of the movement and behavior of the aircraft.
Flight data recorders (FDRs) and cockpit voice recorders (CVRs), commonly known as black boxes, are devices used to investigate the cause of an aviation accident. Orange-painted and crash-proofed, FDRs and CVRs preserve vital information, such as the airplane’s speed and altitude, and conversations between the pilot, copilot, and air traffic controllers.
