現在,一項豁免項請求在取得決定之前可能要花一到兩年的時間,設計鏈協會(DCA)高級副總裁Ken Stanvick指出。因此許多公司呼籲,在處理豁免項請求方面採用方便透明的申請過程和特定的時間窗口。 歐盟委員會還打算讓RoHS指令限制更多的有害物質,雖然目前為止還沒有透露是哪些物質。不過,業內人士認為阻燃劑DBDE、HBCDD和TBBP
Muscle cramps can occur in any muscle; cramps of the leg muscles and feet are particularly common. A muscle cramp is an involuntarily and forcibly contracted muscle that does not relax. When we use the muscles that can be controlled voluntarily, such as those of our arms and legs, they alt...
The six types of asbestos are chrysotile, crocidolite, amosite, anthophyllite, tremolite, & actinolite. Learn about their characteristics and health risks.
Nakata, "Na¨ive (CD4+CD45RA+) T cell subpopulation is susceptible to various types of hazardous substances in the workplace," International journal of immunopathology and pharmacology, vol. 17, supplement 2, pp. 109-114, 2004.Tanigawa T, Takehashi H, Nakata A. Naive...
The presence of environmental pollution raises the issue ofpollution control. Great efforts are made to limit the release of harmful substances into the environment throughair pollution control,wastewater treatment,solid-waste management,hazardous-waste management, andrecycling. Unfortunately, attempts at pol...
“coal-like substances.” (It should be noted that biblical references to coal are to charcoal rather than to therockcoal.) Coal was used commercially by the Chinese long before it was used in Europe. Although no authentic record is available, coal from the Fushun mine in northeasternChina...
Water pollution is the release of substances (such as chemicals or microorganisms) or energy (in the form of radioactivity or heat) into surface and subsurface waters to the point that the substances interfere with beneficial use of the water or with the
Chemistry, the science of the properties, composition, and structure of substances (defined as elements and compounds), the transformations they undergo, and the energy that is released or absorbed during these processes. Chemistry is concerned with the
point that the substances interfere withbeneficialuse of thewateror with the natural functioning ofecosystems. In addition to the release of substances, such aschemicals, trash, or microorganisms, water pollution may include the release ofenergy, in the form ofradioactivityorheat, into bodies of ...
When the ozone layer becomes thin, however, more UVB radiation reaches Earth’s surface and may have hazardous effects on organisms. For example, studies have shown that UVB radiation penetrates theocean’s surface and may be lethal to marineplanktonto a depth of 30 metres (about 100 feet) ...