|
Search
Cleantech Blog * Carbon Sequestration * Only Renewables Gain * Cleantech Power 10 * More >>
Network 
 Facebook
Find A Job 
Post Resume
Follow Cleantech |
Connect with others in your field! Post
your own Question or Comment! Questions & Comments
4/18/2008 12:00:00 AM
Question:
PLEASE SEND ME INF. CATALOG CLEAN TECH ORG. AND PLEASE STAR USE MAGNETIC ENERGY GENERATORS. DEVELOPMENT IN GERMANY 1973. SEND VIA AIRR MAILL TO MR. GABRIEL AVILES GOMEZ 3520 ENON RD. COLLEGE PARK GA.30349-1236 U.S.A. TANK YOU VERY MUCH. ALL TOGETHER CAN FIT THE PLANET NOW.
City/State:
COLLEGE PARK GA.30349-1236,
GA.
2/23/2008 12:00:00 AM
Question:
This may help:
Technology Review: Lithium-Ion Batteries That Don't Explodewww.technologyreview.com/Energy/18762/ City/State:
,
2/22/2008 12:00:00 AM
Question:
DNV is the leading certification company in climate change. They are recruiting for talent in North America. They are having a job fair the week of Feb 27th in San Francisco.
http://www.dnv.us/Binaries/DNV_CC_Positions_tcm30-277020.pdf City/State:
Houston,
TX
2/22/2008 12:00:00 AM
Title:
Head Cheese
Question:
How green are granite countertops?
I would think they would be a green disaster with cutting and polishing. They can't really shear these off along the grain, can they?.. and then they have to be transported and shaped and ... GEES, I am asking because I figure concrete countertops would be a lot greener, a much better opportunity to be creative, and .. thanks Stu City/State:
Fort Worth,
Texas
2/12/2008 12:00:00 AM
Question:
YES! But, nobody has found a practical way to do it yet. Algae (usually, more correctly called cyanobacteria, previously called blue-green algae) are currently used to produce other high-value products on a commercial scale. Go to the library and do some research.
Biofuels from algae will likely succeed where the biofuel is a byproduct or coproduct. The world is facing serious food shortages within a few years (if not this year). Plants, which include algae, are the foundation of food production. We also have a shortage of fresh water. May I suggest that folks should consider building farms that are provisioned by sea water? Deep sea water has abundant nutrients and there is plenty of it. Ernie Rogers City/State:
,
2/11/2008 12:00:00 AM
Title:
BioDiesel
Question:
Hi, I have been looking into the introduction of BioDiesel in Uganda as we have critical issues with supply and demand.
our current price for diesel is $1.38 a litre. the demand for diesel is extremelly high as we use diesel for the generation of electricity, we currently use over 1 million litres per month. I find that this is a huge opportunity for an investor to come in and exploit the market, most of these generation companies have corporate responcibilities, so to get them accross would not be a huge problem and it would reduce our dependence on fossil fuels. I would appreciate any advise as to how I could attract investors. Regards Lawrence Harcourt ps. iam currently making and using BioDiesel for my own use. City/State:
Kampala,
Uganda
1/30/2008 12:00:00 AM
Question:
Check out the new Ieta conference in the Bay Area in a couple of weeks.
City/State:
,
1/15/2008 12:00:00 AM
Title:
Tech-operator
Question:
I heard some events from Cleantech.org will happen in San Jose .
I am impressed about that. Would you please send the information and schedules of those events to me Thank you very much City/State:
San Jose,
CA
1/12/2008 12:00:00 AM
Question:
There's a lot of discussion in DC these days about what policies will eventually be in place when some sort of carbon market is established in the US. Some say it will be in a form of cap-and-trade. But how do we determine a fair cap? Is it based on current levels of emissions? What about developing countries? What is their baseline? Does per capita emissions matter?
City/State:
Santa Barbara,
CA
12/10/2007 12:00:00 AM
Question:
We're a small wind startup looking for A Series funding from strategic partners. Current status: version 2.0 of 2kW and 5kW systems readying for production, very strong pipeline development (3,500 units) and IP. Any leads appreciated...
www.HelixWind.com thanks, Ian Gardner President & CEO ian@helixwind.com City/State:
San Diego,
CA
11/30/2007 12:00:00 AM
Question:
Check out this article on Cleantech vs Greentech
http://www.cleantechblog.com/2007/07/cleantech-vs-greentech.html City/State:
,
11/21/2007 12:00:00 AM
Question:
Hi Neil and CleanTech.org!
Thanks for the invite. What is the difference b/w cleantech and greentech? What online and/or professional communities of practice are active? Enjoy the food and football....?! Willi City/State:
Berkelely,
CA
11/13/2007 12:00:00 AM
Question:
Can the lithium ion batteries used in laptops be used for hybrids and electric vehicles?
City/State:
Reno,
NV
11/13/2007 12:00:00 AM
Question:
Can we harvest lots of oil from algae. I heard they grow very fast.
City/State:
Bakersfield,
CA
11/13/2007 12:00:00 AM
Title:
RE: Wind Power
Question:
According to this document from Lawrence Berkeley National Laboratory, the maximum aerodynamic efficiency of a vertical axis wind turbine (VAWT is lower than that of a horizontal one (HAWT), typically up to 25%:
www-eng.lbl.gov/~rasson/windsail/ gec/Task2report_17Ssept03.doc
City/State:
Santa Fe,
NM
11/13/2007 12:00:00 AM
Question:
Today's solar cells can range from 5 to 19% in conversion efficiency. Most systems are sold in the US residential market are in the in the range of 10 to 15%. With today's technology, some manufacturers claim that efficiencies of up to 22% have been acheived.
http://www.eetimes.com/news/semi/showArticle.jhtml?articleID=193302990 In the future, higher efficiencies may be acheived with thin-film systems that capture a greater range of the light spectrum that is coming from the sun. City/State:
Oakland,
CA
11/13/2007 12:00:00 AM
Question:
Today's laptops use lithium ion technology for the battery but most electric or hybrid vehicles still use a metal or nickel hydride system for their batteries. While lithium is easier to recharge and do not contain toxic metals, they have a overheating problem. The Tesla already uses lithium batteries for their vehicles. Toyota had originally wanted to use lithium batteries for their next generation Prius but there were still concerns of safety with lithium ion. There have also been a few documented cases of laptop batteries exploding because of overheating. If this problem can be overcome, then lithium ion batteries will likely become pervasive in cars.
City/State:
Philadelphia,
PA
11/13/2007 12:00:00 AM
Question:
Not today but in theory, algae can be cultured to grow in large amounts very quickly by storing energy captured from the sun. The oil is then extracted to make the fuel. However, the process is self-limiting because as the algae grow in a limited space or confined area, there is not enough light to sustain all of the cells. As a result, many die before they are ready for harvest.
City/State:
Oahu,
HI
11/13/2007 12:00:00 AM
Question:
Biofuels - for example bioethanol obtained from corn - present an unprecedented set of challenges on the earth's ecosystem. In the US, there has been great interest in replacing a significant percentage of gasoline with ethanol. With food and lumber already straining land and water resource, the extra area needed to supply large amounts of biofuels will put further stresses on the environment and have great impacts on the economy. In addition, vast amounts of agrochemicals will be needed. These are significant sources of pollution.
However, if fuels can be obtained pre-existing sources of biomass, then there will not be additional strain on the environment. For example, cellulosic materials from crops and grasses can be broken down to ethanol to give us fuel. Until a viable technology is available, biofuels are not very sustainable under current methods of harvest and conversion. In other countries, other forms of biofuels like jatrapha oil have proven to be relatively sustainable and is provide an excellent source of income for local farmers.
City/State:
Berkeley,
CA
8/15/2007 12:00:00 AM
Title:
Are biofuels sustainable?
Question:
What are the effects of water use and pollution from a biofuel based economy?
City/State:
San Francisco,
CA
1/3/2007 12:00:00 AM
Question:
Thin film is only 6% of the market today.
Is Thin Film Solar going to surpass crystalline?
City/State:
SF,
CA
1/3/2007 12:00:00 AM
Question:
Most likely not for a very long time. Crystalline silicon technology has been under development for over 50 years and there is a lot of experience in the economy of scale of these technologies. Nevertheless, thin film has the potential and will likely take a large chunk of solar photovoltaic market one day, perhaps decades into the future. Most like, silicon and thin film will be among the major technologies that will remain in this market.
City/State:
San Francisco,
CA
10/16/2006 12:00:00 AM
Title:
Wind Power
Question:
What are the differences between HAWT and VAWT?
City/State:
San Jose,
CA
5/27/2006 12:00:00 AM
Question:
How much light is converted into electricity in a typical solar photovoltaic cell?
City/State:
San Mateo,
CA
|
