Also called

  • EMF

Summary

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  • No. Wall Street strategists’ predicting that the US government’s 10-year borrowing costs will climb above the 3 per cent mark in the coming year is as much a staple of the Christmas period as awkward office parties. This year the forecasts look more likely to be fulfilled, given a withdrawal of quantitative easing and the US tax cut. However, the seismic, secular forces pinning down both inflation and long-term bond yields remain in place and are still underestimated. The Federal Reserve will raise interest rates at least three times in 2018, but the 10-year yield will not breach 3 per cent.
  • 确实有人有近乎完美的记性,可以从过去经历中检索出大量信息。只是,即使很多人认为这样的记忆已经很完美,他们有的时候也不能准确清晰地记起一些特定的细节。虽然真正完美的记忆并不存在,但你还是可以拥有近乎完美的记忆力,超越这些记忆达人,去抵抗岁月给你带来的疾病和健忘。
  • vi. 流通,循环,传播
Electromagnetic fields (EMF) are generated in the vicinity of power lines, mobile phones, mobile phone towers, broadcast towers and similar transmitters. Whether or not EMF can harm human health is a controversial issue. One EMF source to have received significant media attention is the high-voltage power line.

Various studies have comprehensively investigated power lines and cancers (such as leukaemia) to see if there is a causal link. Some researchers maintain that EMF generated by power lines have frequencies which are too low to influence living cells or harm DNA. Other researchers disagree. They suggest that EMF from power lines can cause significant changes in a biological system via electric fields induced in the body. Scientific standards have been developed to limit public exposure to power-frequency EMF, so that induced currents are below those that occur naturally in the body.

Two decades of debate

In 1979, researchers investigating childhood leukaemia in Denver, Colorado (USA) found an association between high-current configuration electrical wiring near the home and an increased risk of childhood cancer (Wertheimer and Leeper). This initial work, however, did not measure electromagnetic fields, relying instead on distances from power lines and the type of wiring. Since then, researchers across the world have investigated power lines. To date, serious limitations have been identified in nearly all studies on power lines and cancer. It has not been possible to confirm whether or not there is a real association between EMF and cancer.

UK findings are inconclusive

The National Radiological Protection Board (NRPB) in the United Kingdom recently released a report which found some evidence that EMF exposures higher than 0.4 microtesla (µT) are associated with a doubling of the risk of leukaemia in children. The review found no evidence of any increased risk of cancer in adults. However, the NRPB was careful to explain that no causal link was found, and recommended that further studies are needed. The evidence for the effect was inconclusive because the key studies in the review might have suffered from selection bias or random variation.

No proof of harm

Despite the evidence for an increased risk of leukaemia in children exposed to higher than 0.4µT of EMF, a range of experimental studies have failed to provide clear supporting evidence for the claim that EMF can be harmful to health, including:
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  • An independent gauge of China’s manufacturing sector edged lower in November, suggesting an uptick in activity at state-run companies did not extend to smaller and privately-owned factories.

Victorian government policy

The Victorian Department of Human Services supports the view that current guidelines on EMF and power lines are adequate, since the EMF generated by power lines is well below the recommended maximum limit of exposure. However, it is advisable to avoid heavy exposure, if possible.

Where to get help

  • Your doctor
  • Department of Health, Radiation Safety Team Tel. 1300 767 469

Things to remember

  • "We felt very helpless that people thought that the fog and haze were caused by poor-quality oil produced by us." FU CHENGYU, member of the CPPCC National Committee and chairman of Sinopec
    “我都不知道要怎么解释拿了年度风云人物奖之后,还是没有女性杂志和组织支持我的事。”
  • 根据世界黄金协会的数据,去年中国的黄金产量估计为420.5吨。该组织表示,同期中国对黄金的需求上升了4%,至953.3吨。
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References
  • Wertheimer, N. & Leeper, E. (1979), 'Electrical wiring configurations and childhood cancer', in American Journal of Epidemiology, vol. 109, no. 3, pp. 273-384, The Johns Hopkins University Bloomberg School of Public Health, USA. Published by Oxford University Press, UK. More information here.
  • Non-ionizing radiation: 50Hz magnetic fields from electricity (2002) [online factsheet], Radiation and Health Information, The Australian Radiation Protection and Nuclear Safety Agency, Department of Health and Ageing, Commonwealth Government of Australia, Canberra. More information here.
  • Moulder, J. E. (2002), Electromagnetic fields and human health, Medical College of Wisconsin, USA. More information here.

More information

Environmental health

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