The heat of re-entry is highly dependent on speed. The second stage of the rocket is responsible for providing most of the speed needed for orbit, after the first stage lifts it out of dense atmosphere.
Falcon 9 separates its first and second stages at relatively low speed, so its reentry starts off drastically slower than a reentry from orbit -- about 1650 m/s for the return-to-launch-site flight in December 2015, compared to orbital speed of 7700 m/s. Stage separation can be quite a bit faster in their downrange, barge landing flights, but the first stage is still moving much slower than orbital velocity.
Burning Fields are a great way to level, obviously. But its impossible to know what fields are burning at this very moment... or is it? Is it completely random or are there a number of fields that are usually burning more often than others?
Each and everyone of us is a player performing on the playa. Burning Man casts all of us at every moment in a heady series of unstaged productions. As one walks or bikes the streets of Black Rock City and out on the open playa, people will be found shining with their talent, every moment of the day and night.
Every day of the event, as the sun sets, the Lamplighters set out to light the streets of Black Rock City. They request the participation of drummers, musicians, and performers of all types to accompany their processions through the city. The walk takes about an hour, is done every evening, and is made infinitely more ceremonious and special with performers joining along, all are welcome. For more information visit The Lamplighters or email lampli...@burningman.com.
Fire safety burn bans are called by the Washington Department of Natural Resources, local fire districts, and Tribes to protect people and property when wildfire danger is high. These burn bans limit outdoor, residential, agricultural, and forest burning.
If you live in an urban growth area, you may not be allowed to have an outdoor fire at any time. Find out about outdoor burning before lighting any fire.
COVID-19 Notice: To help reduce the load on our first responders and others, NWCAA is asking for a voluntary curtailment of woodstoves and outdoor burning. For more information click here.
The degree to which recent bark beetle (Dendroctonus ponderosae) outbreaks may influence fire severity and postfire tree regeneration is of heightened interest to resource managers throughout western North America, but empirical data on actual fire effects are lacking. Outcomes may depend on burning conditions (i.e., weather during fire), outbreak severity, or intervals between outbreaks and subsequent fire. We studied recent fires that burned through green-attack/red-stage (outbreaks
Absolutely love this wood-burning tool. I was using a hobby wood-burning tool before this and the TRUArt one totally knocks it out of the park. Sure this one was a lot more expensive, but it was well worth the investment.
I searched long and hard before purchasing a wood burning pen and I am so happy with my decision!!!!! Its everything I wanted in a wood burner. Slim handle, high heat and finer tips for better detail!
Typically, weather conditions allow for good air quality in our region, but during colder months, weather inversions and calm winds are more common. Without strong winds, the air becomes stagnant and weather inversions trap the air closer to the ground. These conditions combined with an increase in wood burning make air quality burn bans necessary to decrease wood smoke emissions and to protect air quality in our neighborhoods and the health of those living there.
An air quality burn ban is a mandatory, yet temporary, order that restricts the use of wood stoves and fireplaces, as well as outdoor burning, when air quality is degraded, and human health may be impacted. Air quality burn bans typically occur during fall and winter months and usually last a few days, but they may last for up to a week or more. They also may sometimes occur during the summer months if there is wildfire smoke.
There are two types (stages) of air quality burn bans that can be issued. Stage 1 burn bans are typically based on weather conditions and rising pollution levels. Stage 2 burn bans are called when fine particle pollution levels reach a trigger value set by state law.
An air quality burn ban is a mandatory, yet temporary, order that restricts the use of wood stoves and fireplaces, as well as outdoor burning, when air quality is degraded and human health may be adversely impacted. Air quality burn bans typically occur during fall and winter months and may last for up to a week or more. They also may sometimes occur during the summer months if there is wildfire smoke.
The smoke from burning wood and wood-based products contains fine particles (soot) and a toxic mix of other carcinogens. This pollution is harmful to your health, particularly for young children, older adults and people with respiratory and heart disease. During stagnant weather conditions, concentrations of wood smoke can reach harmful levels, so we restrict wood smoke emissions to protect air quality in our neighborhoods and the health of those living there.
Prior to any burning, we suggest you contact our Burning Information Line at 425-388-3508 to verify that there are no Burn Bans or Burning Limitations that may have been placed due to high fire danger or air quality conditions. For additional air quality information you can contact Puget Sound Clean Air Agency.
Since 2008, the Puget Sound Clean Air Agency has maintained a permanent ban on land clearing burning in land-clearing burning Snohomish, Kitsap, King, and Pierce counties in accordance with WAC 173-425-040(5). Land clearing burning applied to fires to clear land for development, such as building a new structure or subdivision.
Residential burning, a burn pile no larger than 4 feet by 4 feet by 3 feet, requires a permit under our burn permit ordinance (PDF). Residential burning means the outdoor burning of leaves, clippings, prunings, and other yard and gardening refuse originating on lands immediately adjacent and in close proximity to a human dwelling and burned on such lands by the property owner or his or her designee.
Burn Permits are required and issued by the Office of the Snohomish County Fire Marshal and participating local fire districts for residential burning. Permits will be issued for locations outside the Urban Growth Areas (UGA) that are outside of the established no-burn zones (PDF) and within fire protection districts of unincorporated Snohomish County.
The following fire districts have entered into an inter-local agreement with Snohomish County to issue permits on behalf of the county and will regulate burning and burn permits within their districts:
Hi guys so I'm new to the forum , had my golf7r about a month now and I'm getting a oil burning smell when i come to a stand still in traffic. The problem is intermittent not every time and the harder I drive the car the less it does it. Mostly noticeable on slow work commutes and slow driving.
We can't really see things occur on the molecular scale, but we can use models (or pictures or animations) to help us visualize what's happening. Let's look at the stages of a fire on the molecular scale.
The grass stage is widely accepted as an adaptation to frequent fire (Brockway et al. 2006, Keeley 2012), yet several studies have reported high mortality rates of small grass stage seedlings following fire (Croker and Boyer 1975, Grace and Platt 1995a, Moule 2013). Brockway et al. (2006) suggested a threshold root collar diameter of 13 mm for increasing the probability of survival from surface fire, although seedling mortality has also been shown to increase with fire intensity (Jack et al. 2010). Observations of seedling aggregation within canopy openings in naturally regenerated longleaf pine stands may be related to fire-induced mortality of longleaf pine seedlings beneath canopy pines (Grace and Platt 1995a, Avery et al. 2004). However, effects of seedling size and fire intensity on mortality are difficult to separate in observational studies because greater canopy densities often correspond to greater competition (i.e., smaller longleaf pine seedlings) and greater fuel loads from needlefall (i.e., greater fire intensity).
Fire adaptation of longleaf pine seedlings is often associated with traits that allow for survival, whereas the impacts of fire on seedling growth have not been well documented. The consumption of foliage by fire would necessitate the allocation of stored carbohydrate to replace needles and restore pre-burn photosynthetic capacity. Long-term experimental studies have reported growth reductions of longleaf pine saplings following repeated prescribed burning (Boyer 1987). However, the release of nutrients following burning and the consumption of competing vegetation may also provide opportunities for increased growth of survivors (Brockway et al. 2006). Grelen (1978) reported that prescribed burning increased the proportion of seedlings that had emerged from the grass stage in a four-year study in Louisiana, USA. It is not clear to what degree burning alone, in the absence of indirect effects such as changes in resource availability, affects longleaf pine seedling growth responses.
Previous studies have shown season of burn to be an important ecological driver within frequent-fire ecosystems, although effects vary across taxa and by response variable (Platt et al. 1988a, Streng et al. 1993, Hiers et al. 2000). Generally, burning within the growing season has been reported as more effective at killing small hardwood trees than burning in the dormant season (Waldrop et al. 1992, Brose et al. 1999). Seasonal effects of burning on trees and shrubs have been attributed to differences in fire intensity due to differences in weather conditions during burns, as well as to differences in plant physiology at the time of burning (Glitzenstein et al. 1995, Drewa et al. 2002). Although previous studies have reported no effects of season of burn on longleaf pine survival (Glitzenstein et al. 1995, Jack et al. 2010), these studies either considered trees that were out of the grass stage, or grouped grass stage seedlings as a single size class.
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