Sri Ramakrishna Mission Vidyalaya Polytechnic College, Coimbatore - 641 020

  Water Treatment Public drinking water systems use different water treatment methods to provide safe drinking water for their communities. Public water systems often use a series of water treatment steps that include coagulation, flocculation, sedimentation, filtration, and disinfection.           Water treatment steps Coagulation Coagulation is often the first step in water treatment. During coagulation, chemicals with a positive charge are added to the water. The positive charge neutralizes the negative charge of dirt and other dissolved particles in the water. When this occurs, the particles bind with the chemicals to form slightly larger particles. Common chemicals used in this step include specific types of salts, aluminum, or iron.   Flocculation Flocculation follows the coagulation step. Flocculation is the gentle mixing of the water to form larger, heavier particles called flocs. Often, water treatment plants will add additional ch...

A skylight can provide your home with daylighting and ventilation. Because skylights are located on the roof, they can result in unwanted additional heat in summer and loss of heat from the inside of the hom in the winter. To make skylights more energy efficient, manufacturers use various glazing technologies including heat-absorbing tints, insulated glazing, low-emissivity (low-e) coatings, or translucent insulation material between several glazing layers.  Tubular Skylights Recent developments in skylight design use sun-tracking, open-sided cylinders; large lens-like elements; or mirrored reflectors mounted adjacent to a conventional skylight to provide daylighting without daytime heat gain or nighttime heat loss. Such a skylight may connect to a mirrored pipe or "light pipe" with a diffusing lens that mounts on or is recessed into the ceiling of the room below. Most tubular skylights have this feature. Tubular skylight designs do not, however, provide views or ventila...

இந்தியாவின் பெரும் கனவு திட்டமான இந்த சந்திரயான்-3 திட்டம் குறித்த பல முக்கிய தகவல்கள் நாம் கட்டாயம் தெரிந்து கொள்ள வேண்டும். சந்திரயான்-3 திட்டம் வெறும் விஞ்ஞானிகளின் சாதனை மட்டுமல்ல அது இந்தியாவிற்கே ஒரு பெரும் கௌரவத்தையும் பெருமையையும் ஏற்படுத்தக் கூடியதாகும். இது குறித்த முக்கியமான தகவல்களை காணலாம் பாருங்கள். 1. மூன்றாவது மிஷன்: சந்திரயான்-3 என்பது இஸ்ரோ நிலவில் ஆய்வு மேற்கொள்வதற்கான மூன்றாவது மிஷன் ஆகும். முதல் மிஷன் நிலவின் நீல் வட்ட பாதையில் ஆர்பிட்டரை நிலை நிறுத்தி நிலவில் ஆய்வுகளை மேற்கொண்டது. இரண்டாவது மிஷனில் லேண்டரில் ஏற்பட்ட பிரச்சனை காரணமாக விக்ரம் லேண்டர் நிலவில் தற்போது சந்திரயான்-3 மூன்றாவது மிஷனாக இஸ்ரோவிற்கு அமைந்துள்ளது 2. தோல்வியில் இருந்து பாடம்: சந்திரயான்-2 விண்கலம் நிலவில் தரையிறங்கும் போது சில வினாடிகளுக்கு முன் கோளாறு ஏற்பட்டு சாஃப்ட் லேண்டிங் ஆக இல்லாமல் நிலவில் சென்று மோதியது. தற்போது அதிலிருந்து பாடம் கற்றுக்கொண்ட இஸ்ரோ அதிலிருந்த பிரச்சனைகளை எல்லாம் சரி செய்து இந்த முறை நிச்சயம் சாஃப்ட் லேண்டிங் செய்யும்படி திட்டமிட்டு சந்திரயான்-3 விண்கலத்தை தயார் செய்...

  Chandrayaan-3 is a follow-on mission to Chandrayaan-2 to demonstrate end-to-end capability in safe landing and roving on the lunar surface. It consists of Lander and Rover configuration. It will be launched by LVM3 from SDSC SHAR, Sriharikota. The propulsion module will carry the lander and rover configuration till 100 km lunar orbit. The propulsion module has Spectro-polarimetry of Habitable Planet Earth (SHAPE) payload to study the spectral and Polari metric measurements of Earth from the lunar orbit. Lander payloads:  Chandra’s Surface Thermophysical Experiment (ChaSTE) to measure the thermal conductivity and temperature; Instrument for Lunar Seismic Activity (ILSA) for measuring the seismicity around the landing site; Langmuir Probe (LP) to estimate the plasma density and its variations. A passive Laser Retroreflector Array from NASA is accommodated for lunar laser ranging studies. Rover payloads:  Alpha Particle X-ray Spectrometer (APXS) and Laser Induced Breakdown...

A rainscreen system is the embodiment of building scientist Dr. Joseph Lstibrurek’s two rules of moisture management: “Keep water out; Let water out if it gets in.” The rainscreen is the first line of defense against the effects of moisture on the wall detail. A rainscreen is the weather-facing surface of an exterior wall detail that stands off at least 1/8” from the moisture-resistant surface of the structural back up wall.  No building envelope is 100% waterproof. The addition of a drainage plane mitigates the risk of moisture intrusion from unavoidable imperfections in the wall materials and construction. The Rainscreen Drainage Gap A variety of techniques and products can be used to create the air gap needed in a rainscreen system. Sure Cavity and Gravity Cavity are made of a rigid corrugated plastic with a mortar blocking fabric that covers the exterior wall surface and provides a predictable drainage gap and an unobstructed path for moisture to exit the wall system. This ...

  By clicking this link you can get a video containing 20 Objective Question in surveying                                               https://youtu.be/LH_rV0Xh-Is

Micro-piles/ mini-piles/ pin-piles/ root-piles are high-strength, durable, small-diameter generally 6-12”(150-300mm) steel casing pile or rib or bar and stuffed with a high strength cement grout used to bore hole. The bearing stratum is logged throughout installation drilling to assure that bearing capability is adequate. Since small piles are smaller in diameter they will be advanced through the bottom at a better speed and may break through materials with larger ease than a caisson casing or a driven pile. The micropiles will penetrate any obstructions which will typically cause premature refusal whereas putting in mistreatment typical spile strategies. Grouting is achieved by tremie grouting, pressure grouting throughout casing retraction, and tremie-grouting with post-grouting. Post-grouting among the bond length will increase resistance forces with close soils, so achieving larger capability. Micropile capacities...