landmark |
||||||
|
News for 14-Aug-25 Source: MedicineNet High Blood Pressure General Source: MedicineNet High Blood Pressure General Source: MedicineNet High Blood Pressure General Source: MedicineNet High Blood Pressure General Source: MedicineNet Diabetes General Source: MedicineNet High Blood Pressure General Source: MedicineNet Diabetes General Source: MedicineNet High Blood Pressure General Source: MedicineNet High Blood Pressure General Source: MedicineNet Diabetes General
|
The Best landmark websiteAll the landmark information you need to know about is right
here. Presented and researched by http://www.mdnewscast.net. We've searched
the information super highway far and wide to provide you with the
best landmark site on the internet today. The links below will
assist you in your efforts to find the information that you are looking
for about
landmark
As you are aware the World Wide Web is a collection of electronic documents that are linked together like a spider web. As you explore this Network you will find lots of information on landmark. In fact we estimate that you will locate no less than 10,000 documents or web sites on landmark. The landmark websites or pages are located on computers which are called servers. Some servers are exclusively dedicated to landmark. If a landmark supplier is sufficiently committed to their marketing that they develop their own server technology to service landmark customers then you can be reasonably confident that they are there for the long haul. landmark
The links will take you to web sites we judge have been created by experts in the field of landmark, and that will become obvious to you also as soon as you arrive at the sites. However we know that everyone is different in their landmark requirements and suggest if you don't find what you are looking for at the above sites, visit Yahoo which is arguably the best search engine on the net, and then perform a search on landmark. We might mention that yahoo is by no means your only search engine option when you are looking for landmark information, other search engines are google alta vista, hotbot, msn, etc which should all produce good landmark results. Sick Building Syndrome and Indoor Climate Control by: Simon Fowler The problem of high levels of CO2 in ambient air appears to be a modern one. Yet, this is not one of the new fads that crop up from time to time and then disappear again, never to be mentioned again. It is, indeed, a modern problem, caused by the improvements in building standards and especially window manufacture. These improvements, hailed as a triumph over the age-old problem of draughty buildings, have nevertheless created a new negative effect. Ventilation was never a matter for discussion in most cases, it happened naturally as the wind blew and the air in rooms was replaced on a regular basis. With the new, draught-proof buildings this no longer happened, particularly since central heating made it unnecessary to have an air flow for any reason. This has given birth to the concept of indoor climate control. The result was stale air. Air that has been used and breathed and not replaced, seen as a rising concentration of carbon dioxide, not to mention humidity. These effects had a detrimental influence on the buildings, promoting the growth of mould and other unwanted plant life. This was not the only effect. Slowly, the level of days off for sickness rose and the quality of work sank in these newer or refurbished buildings, leading to something referred to as Sick Building Syndrome, since it appeared to affect everybody in one building. The causes were not known for a long time, but now it is recognised that this is a result of breathing stale air with a high concentration of carbon dioxide over an extended period. Studies have shown that a level of 1000 ppm carbon dioxide will reduce the ability to concentrate by about 30 %, a significant drop by any means. The obvious solution to this problem of indoor climate control was ventilation, and ventilation or air-conditioning systems were installed in all of these buildings leading only to the next problem: the heating bills in winter rocketed and staff complained of stiff necks and other maladies. Sick Building Syndrome was still here, but in a different form. How to provide adequate ventilation without simply heating the environment in winter? The only viable solution is control of the ventilation to reduce the exchange of air to the minimum required to keep a healthy atmosphere in the rooms, which is where indoor climate control becomes an active instead of just a passive discipline. The real problem is the carbon dioxide, which is best measured with a NDIR infrared sensor. These are available in one or two channel technology for CO2, but the single channel version is quite accurate and stable enough for this purpose today. Older types of sensor used to drift, as do cheaply manufactured ones, but a good-quality single channel sensor today will remain stable over years, only requiring a reference point occasionally to set a relative zero point. Such infrared sensors for CO2 are now available from a number of manufacturers such as Madur Electronics in Austria. These come complete with an appropriate analogue output to allow the CO2 level to control the function of the ventilation system. Industry standard for these control functions is the 0…10 V output, but there are other varieties in use. These can be readily accommodated in the construction or calibration of the system to ensure a high quality of indoor climate control. Perhaps we have finally seen the end to Sick Building Syndrome and can now enjoy the benefits of a controlled climate indoors, if not outdoors.
|
|||||
|
http://www.medmeet.com/ |
||||||
| Medical Presentations Medical Meetings On The Net Medical Meetings On The Net |