Showing posts with label efficiency. Show all posts
Showing posts with label efficiency. Show all posts

Tuesday, April 22, 2008

Ugh

Very enlightening. From the New Republic.

Highway Bias

Just to follow up on the point about public transportation in the previous post, it's no secret that Congress has always spent far more to promote driving than it's spent on public transit—note that the White House requested $40 billion for the federal highway budget in 2008, versus $1.08 billion for railroad funding. But that's only the beginning. While doing some searching around, I came across an old Brookings report from 2003, which usefully compared the funding process for highway and mass transit projects, and laid out some glaring differences. nder current law, the federal government usually covers about 80-90 percent of the costs for a new highway project, compared with only 50 percent of the costs for a transit system. Local communities have to pick up most of the rest of the tab for public transportation, with state governments chipping in what's left. Since doing that usually requires raising property taxes, most local governments just prefer to build highways. (Indeed, some 30 states restrict their gas-tax revenues to highway purposes only.)

Moreover, transit projects have to undergo intensive scrutiny: a cost-benefit analysis, a land-use analysis, an environmental-impact analysis, and, usually, a detailed comparison among various alternatives. That all sounds pretty reasonable, except that highway projects don't have to undergo any of this—save for a (considerably less strict) environmental analysis—federal oversight is rather minimal. Highway money is basically a gift to states and local governments.

Not surprisingly, most communities find it far easier to build new highways than to set up, say, a light-rail system, no matter how popular the latter might be. (The Brookings report gives an example of a popular light-rail proposal in Milwaukee going down in flames for exactly this reason.) So, sure, any decent plan for reducing emissions and curbing gasoline use should include more money for public transit. But it also seems like a lot of funding rules need to be changed, so that transit and highway projects can compete on a more level playing field.

--Bradford Plumer

Saturday, February 2, 2008

Moishe: My Sylvia Already Understands, But Here's a Think Piece for Your Sunday Afternoon Cooking Experiments

Click the link above, as always, for the full article.

The Curious Cook
The Invisible Ingredient in Every Kitchen
By HAROLD McGEE

OF all the ingredients in the kitchen, the most common is also the most mysterious.

It’s hard to measure and hard to control. It’s not a material like water or flour, to be added by the cup. In fact, it’s invisible.

It’s heat.

Every cook relies every day on the power of heat to transform food, but heat doesn’t always work in the way we might guess. And what we don’t know about it can end up burning us.

We waste huge amounts of gas or electricity, not to mention money and time, trying to get heat to do things it can’t do. Aiming to cook a roast or steak until it’s pink at the center, we routinely overcook the rest of it. Instead of a gentle simmer, we boil our stews and braises until they are tough and dry. Even if we do everything else right, we can undermine our best cooking if we let food cool on the way to the table — all because most of us don’t understand heat.

Heat is energy. It’s everywhere and it is always on the move, flowing out as it flows in. It roils the chemical innards of things, exciting their molecules to vibrate and crash into each other. When we add a lot of heat energy to foods, it agitates those innards enough to mix them up, destroy structures and create new ones. In doing so it transforms both texture and flavor.

There are, however, uncountable ways to misapply heat. In most cooking, we transfer energy from a heat source, something very hot and energetic, to relatively cold and inert foods. Our usual heat sources, gas flames and glowing coals and electrical elements, have temperatures well above 1,000 degrees Fahrenheit. Boiling water is around 212 degrees.

Cooks typically heat food to somewhere between 120 degrees (for fish and meats that we want to keep moist) and 400 degrees (for dry, crisp, flavorful brown crusts on breads, pastries, potatoes, or on fish and meats).

At the bottom of that range, a difference of just 5 or 10 degrees can mean the difference between juicy meat and dry, between a well-balanced cup of coffee or tea and a bitter, over-extracted one. And as every cook learns early on, it’s all too easy to burn the outside of a hamburger or a potato before the center is warm.

That’s the basic challenge: We’re often aiming a fire hose of heat at targets that can only absorb a slow trickle, and that will be ruined if they absorb a drop too much. Are you ever annoyed by pots that take forever to heat up, or frustrated by waiting for dry foods to soften? A kitchen that becomes hot enough to be a sauna? Big jumps in the utility bill when you do a lot of cooking? The problem, as you will notice if you pay more attention to your kitchen’s thermal landscape, even in terms of what you can feel, is how much heat escapes without ever getting into the food.
...