In July 2015, China Academy of engineering Yong Ding Zhen, Shang Yuan, mentougou district, representatives of the national people’s Congress, Wang mengshu received Lu Huirun jiayuan resident representative sent a letter to “demand” letter, Beijing Hui Runjia Maglev line S1 distance is described in several buildings near the Park, only recently more than 20 meters. Attached to the letter the signatures of hundreds of people in the community. Wang mengshu liaison office immediately to the national people’s Congress, wrote a letter on this matter, and will “demand” letter attached at the back.
This isn’t the first time Wang mengshu received such a demand letter, as early as the early 21st century, when to build the Maglev to Hangzhou, Shanghai, he encountered a similar thing. This plan was eventually shelved.
Although the maglev train was constantly on the agenda in recent years and repeatedly questioned, however, did not stop the development of maglev trains. However, suitable for Maglev development in where?
Excess radiation in legend
Blocked in mentougou S1 line radiation is the biggest reason. So daunting as rumors of radiation really so terrible?
In 2008, the Shanghai Research Academy of environmental sciences, the first publication by the Shanghai Airport Maglev line EIA report has caused a lot of controversy. Report, under the 200km/h speed, car 5 m electric field strength of about 0.000318kV/m (standard limit of 4kV/m), magnetic flux density of about 1.28 μ/t. Magnetic flux density, the Environmental Protection Department came up with the 50Hz control exposure of the general public in the magnetic field limit of 100 u/t, and the standard limits are consistent with World Health Organization recommendations. Therefore, the magnetic flux density is much lower than the corresponding standards of the Shanghai Maglev.
However, there are media reports, most strict international standards in electromagnetic induction intensity is Switzerland 0.2 u/t. If 100 μ/t as a standard, it does not require the establishment of shelter belts.
Electromagnetic radiation in the former State environmental protection administration of China Zhao Yufeng environmental impact review experts Committee members have participated in the Maglev Project EIA validation work, at that time, he also pointed out to the media, the recommended standard is too loose, and should be revised.
Zhao Yufeng told the China science news reporters, in October 2014, the new limit values of electromagnetic environment control (GB8702-2014) has issued standards throughout the country since January 1, 2015. 50Hz magnetic field control of exposure of the general public limit of 5 μg/t below World Health Organization international standards recommended by the International Commission on non-ionizing radiation protection.
One at the national “863” project is engaged in the research of high power microwave technology expert on condition of anonymity in an interview with reporters of the China Science News, explained in nature, electromagnetic waves are almost everywhere, “because the Earth is a large magnetic field, so the electromagnetic fields in the environment we live all the time everywhere. Even common wires in your House, if you use the instrument, you can measure the electromagnetic response of lateral line traces. ”
In the electromagnetic spectrum, including high frequency electromagnetic waves, and low frequency electromagnetic wave two, which stays above 100kHz, feature is the electromagnetic field of electromagnetic energy with the rapid cycle change, in the form of electromagnetic waves propagation, there is a risk of radiation; the latter frequency 50Hz of electromagnetic waves, electromagnetic energy return circuit, passed only by the metal conductor, almost no radiation.
At present, “in our country have been opened or planned suspension belonged to medium and low speed Maglev speed at 100km/h. “Former Vice President of the China Academy of railway Sciences Zhu Qijie received the China scientific journal reporters,” mentougou under construction belongs to the S1 line of medium and low speed Maglev. ”
”Magnetic radiation is non-ionizing radiation of the low frequency, energy is weak. “Zhao Yufeng explains,” some of the clinical symptoms of non-ionizing radiation, are also functional changes will not have a devastating impact on molecules, once leaving the environment, can be restored, unlike ionizing radiation induces changes in nature. “Moreover, the current magnetization measurements of the Maglev project, as long as at least ten or twenty-metre protection zone, which is basically will have no impact on the surrounding population health.
Energy consumption and costs are still flawed
If the radiation was not Maglev “discourage” the main factor, so the development of Maglev in the end card where? now, Shanghai Pudong Maglev railway is the world’s first commercial Maglev line, the total length of about 30 km, each kilometer costing 300 million Yuan over the line, speed was fast, fares have less than satisfactory.
When it was built, the Maglev line ordinary seat sells for $ 75 for a one-way ticket, VIP seating for 150 Yuan. Such high prices, many people still choose the traditional traffic, after all, city, Shanghai maglev trains cannot be reached, after arriving at the longyang station also needs to change. Faced with increasingly dismal operation of Shanghai Maglev transportation development co adjust fares, ordinary seats now sell for 50 Yuan, VIP seats are reduced to 100 Yuan. But when can it recover its operating costs and construction costs are still unknown.
Mentougou the S1 line of the building, its cost is also higher than initially predicted. North charged with introduction of the Maglev, China subway cost around 1 billion ~14 billion per km, light rail is 300 million ~4 billion yuan, compared to 200 million medium and low speed Maglev ~3 billion. But this is not true. The S1 line in Beijing as examples, West the EIA report showed that average construction cost 642 million yuan per kilometer. Under leadership of the mentougou district, mentougou section of S1 1 billion yuan for every kilometer. However, the Maglev technology Engineering Research Center at the University of science and technology for national defense Chang Wensen, Chief Architect, in which money is used for demolition, construction, independent of the engineering projects.
Cause this programming, additional construction cost is too high. “Shanghai Airport line using magnetic levitation equipment full from Germany import, so construction costs are high. “Zhu Qijie said,” if we can use domestic technologies, costs can be reduced by half or so. ”
Unable to connect rail development
However, whether it is “in jeopardy” the Shanghai-Hangzhou magnetic levitation, or has been built using the Shanghai Airport line and the airport line, Beijing, reflected awkward Maglev development at this stage.
Back in early discussions of construction in Shanghai-Hangzhou Maglev, Zhu Qijie was invited as experts to study results of the investigation were ridiculous. “On the Shanghai-Hangzhou magnetic levitation line, only one station is set, is the station of jiaxing. The jiaxing city 10 km to station locations, jiaxing, which means that if someone wants to take the Maglev to Hangzhou, Shanghai or, you need to solve the 10 km distance from the city to the station. “Zhu Qijie said. However, traveler’s priority traffic is convenient, such sets must reduce the number of people riding the Maglev, “what’s more, when Shanghai to Hangzhou already have four lines, traffic forecasts, there is no need to build a rail line. “Zhu Qijie further explained that” as a result, our group naturally rejected the construction of the line. ”
A few years ago, mentougou in Beijing built into the Apple Orchard before commencement of the S1 line, Zhu Qijie fieldwork is conducted, when he also raised objections. “I am opposed to the construction of this line, not because of radiation, on the contrary, I think Maglev is a State of the art technology, it has low noise, the advantages of climbing ability. But the S1 line built for more than 10 km in length, during which set up eight stations, meaning that an average of one kilometer on a platform. ”
Zhu Qijie was more inconceivable is that there was a municipal media wrote “mentougou to Apple orchards in just 10 minutes” in the media. “Station opens too many magnetic speed advantage not reflected, like driving a car, a foot throttle down immediately on the brakes. Moreover, throwing open both ends of the station did not say, there are six other stations, a station docking time of at least 2 minutes, then just stop time you have to wait for more than 10 minutes, how to mentougou Apple Orchard just 10 minutes to say? ” Zhu Qijie said, “and to Maglev vehicle docking and overhaul, maintenance, must be planned and built a separate depot and tie-line, and not less, increased construction costs. ”
Apple Orchard is the terminus of Line 1 of Beijing subway line, but the new maglev trains cannot be achieved “seamless” change, the Maglev and subway locomotive cannot be “one roof” parked, so only a single plan. In fact, faces connected with rail traffic problems and, not only is this a Maglev line. All the maglev trains are facing this problem.
In 2012, the Executive meeting of the State Council for discussion and adoption of the “Twelve-Five” in the planning of comprehensive transportation system, the “rail transport services covering commodities distributing center and more than 200,000 people city”, unstoppable during the development of rail transport, track laying of the road network has increased the convenience of train passengers.
”Development of magnetic levitation train in China are faced with a problem that can’t be linked into the rail network. “Zhu Qijie said. Wang mengshu, of wheel and rail traffic is more developed in China, now Gao Tiebi Maglev more realistic and more able to meet the demand. Earlier media reports, the Beijing-Shanghai high-speed railway connects the more than more than 20 lines, produced a large number of transfer stations, 2/3 of the traffic flow from different lines to high-speed rail, Maglev transfer station and the interchange point between wheel and rail compatible together, causing great difficulties to passenger transfer.
However, Zhu Qijie thought, because of its characteristics of low-speed Maglev vehicle, is can be selected as a mode of urban rail transit, but the chosen road sections must reflect the advantages of maglev train. “In fact, no matter which trains require scientific planning and in particular enhance the speed and cost are reasonable. ”
Electromagnetic radiation is also called electronic smog, is shared by the space formed by transfer of electric energy and magnetic energy, and that energy is generated by a moving charge. Signals emitted by a radio frequency antenna mobile charge creates electromagnetic energy. Electromagnetic “spectrum” includes all kinds of electromagnetic radiation, from extremely low frequency electromagnetic radiation of high-frequency electromagnetic radiation. Between the two there are radio waves, microwaves, infrared, visible light and ultraviolet light.
Although the network once it was hundreds of times times the magnetic radiation is compared to a microwave oven, but Zhao Yufeng thinks it’s totally inconsistent with science. Because microwave oscillation frequencies between 915MHZ~2450MHZ, significantly higher than the frequency of the magnetic, so the magnetic field they produce is not comparable at all.
Radiation: Records how to break through the highest raise
Radiation is the nucleus from one energy State to another structure or a structure or another kind of micro-particles of energy released in the process flow. Ionization or excitation caused by nuclear radiation can make the material, it is called ionizing radiation.
Radiation mainly three types of rays are α, β, γ, as far as property is concerned, α-rays emitted by the radioactive nuclides positively charged helium nuclei particles; beta radiation is emitted the nuclei of high-speed electronic flow gamma rays are photons emitted radioactive nuclei the flow. Among them, the source into the α rays α particles into the body causing serious damage to organs, beta-Ray external radiation and internal radiation are harmful, and the gamma-ray has a strong penetrating power, can cause eye damage.
Nuclear magnetic resonance:
Nuclear magnetic resonance is the nuclei of magnetic moment is not zero, under external magnetic field spin level Zeeman splitting, resonant absorption of radiofrequency radiation of a specific frequency of physical processes. NMR spectroscopy is a branch of spectroscopy, resonant frequencies in the radio frequency band, the corresponding transitions is the nuclear spin in nuclear Zeeman energy level transitions.
In medical Shang, NMR Imaging (MRI) check has became a common of image check way, not on human health has effect, but six class crowd not suitable for NMR check: even installation pacemaker of people, and has or suspected has eye within metal foreign body of people, and aneurysm silver clip ligation operation of people, and body metal foreign body remains or metal fake body of people, and has life dangerous of critical patients, and claustrophobic fear syndrome patients,. Checks cannot take monitoring, rescue equipment brought into the MRI room. In addition, pregnant women in less than 3 months of pregnancy, it is best to do an MRI.