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Geylang Serai is one of the oldest Malay Settlements in Singapore. The significance of early Geylang Serai lies not in its architectural features but in its reputation as the Malay emporium of Singapore, known to Malays of Malaysia, Brunei and Indonesia. In the 1840s, some Orang Laut (sea nomads) settled on the bank of the Geylang River. The settlement expanded to the Geylang Serai area in the later half of the 19th century. At this time, the rich Arab family of the Alsagoffs owned the large Perseverance Estate on which the extensive cultivation and growth of lemon grass plants led the settlement area to be known as Geylang Serai - where serai is Malay for lemon grass. Some suggest that the name Geylang is a corruption of the Malay kilang meaning press, mill or factory, probably a reference to the presses and mills in the coconut plantations in the area which produced oil from the copra.
In the early 1900s, after the failure of the lemon grass industry, the Malays and the Chinese farmers remained on the Alsagoff estate but turned to cultivating coconut, rubber, vegetables, and rearing poultry for a living. By 1910, Singapore's first tramline service had its eastern terminal at Geylang Serai. The landscape changed during the Japanese Occupation when people started planting tapioca, or ubi in Malay. Part of Geylang Serai then became known as Kampong Ubi.
After the war, Geylang Serai's population increased and the uninhabited areas were gradually occupied. In the 1950s, when the better off Chinese moved out of the area, more Malay people moved in and the population of Geylang Serai became predominantly Malay. On 12 April 1964, during Indonesia's Confrontation, a bomb exploded at a block of flats at Geylang Serai, killing two men. Communal riots between Malays and Chinese broke out several months later on 21 July 1964 on Prophet Muhammad's birthday. In 1965, the Geylang Serai Housing Scheme redevelopment programme built three blocks of flats. Further redevelopment by the early 1980s, saw the completion of Housing Development Board (HDB) flats, Industrial Estates of light industries, and modern shopping complexes. Along with the modernisation programme, the Government decided to preserve the Malay cultural heritage. Thus, a one hectare site called the Malay Village (bordering Sims Avenue, Geylang Serai and Geylang Road) was set aside to showcase a replica of a Malay kampong and to promote traditional Malay handicraft and cultural activities.
Author
Vernon Cornelius-Takahama
References
National Archives, Singapore. (1996). Geylang Serai: Down memory lane: Kenangan abadi (pp. 16-30). Singapore: Heinemann Asia.
(Call no.: RSING 779.995957 GEY)
Urban Redevelopment Authority. (1994). Geylang Planning area: Planning report 1994 (pp. 4, 6, 8). Singapore: Urban Redevelopment Authority.
(Call no.: RSING 711.4095957 SIN)
http://m.phys.org/news/2015-03-particle.html
The first ever photograph of light as both a particle and wave
Mar 02, 2015
(Phys.org)—Light behaves both as a particle and as a wave. Since the days of Einstein, scientists have been trying to directly observe both of these aspects of light at the same time. Now, scientists at EPFL have succeeded in capturing the first-ever snapshot of this dual behavior.
Quantum mechanics tells us that light can behave simultaneously as a particle or a wave. However, there has never been an experiment able to capture both natures of light at the same time; the closest we have come is seeing either wave or particle, but always at different times. Taking a radically different experimental approach, EPFL scientists have now been able to take the first ever snapshot of light behaving both as a wave and as a particle. The breakthrough work is published in Nature Communications.
When UV light hits a metal surface, it causes an emission of electrons. Albert Einstein explained this "photoelectric" effect by proposing that light – thought to only be a wave – is also a stream of particles. Even though a variety of experiments have successfully observed both the particle- and wave-like behaviors of light, they have never been able to observe both at the same time.
A research team led by Fabrizio Carbone at EPFL has now carried out an experiment with a clever twist: using electrons to image light. The researchers have captured, for the first time ever, a single snapshot of light behaving simultaneously as both a wave and a stream of particles.
The experiment is set up like this: A pulse of laser light is fired at a tiny metallic nanowire. The laser adds energy to the charged particles in the nanowire, causing them to vibrate. Light travels along this tiny wire in two possible directions, like cars on a highway. When waves traveling in opposite directions meet each other they form a new wave that looks like it is standing in place. Here, this standing wave becomes the source of light for the experiment, radiating around the nanowire.
This is where the experiment's trick comes in: The scientists shot a stream of electrons close to the nanowire, using them to image the standing wave of light. As the electrons interacted with the confined light on the nanowire, they either sped up or slowed down. Using the ultrafast microscope to image the position where this change in speed occurred, Carbone's team could now visualize the standing wave, which acts as a fingerprint of the wave-nature of light.
Credit: Fabrizio Carbone/EPFLWhile this phenomenon shows the wave-like nature of light, it simultaneously demonstrated its particle aspect as well. As the electrons pass close to the standing wave of light, they "hit" the light's particles, the photons. As mentioned above, this affects their speed, making them move faster or slower. This change in speed appears as an exchange of energy "packets" (quanta) between electrons and photons. The very occurrence of these energy packets shows that the light on the nanowire behaves as a particle.
"This experiment demonstrates that, for the first time ever, we can film quantum mechanics – and its paradoxical nature – directly," says Fabrizio Carbone. In addition, the importance of this pioneering work can extend beyond fundamental science and to future technologies. As Carbone explains: "Being able to image and control quantum phenomena at the nanometer scale like this opens up a new route towards quantum computing."
More information: "Simultaneous observation of the quantization and the interference pattern of a plasmonic near-field." Nature Communications 02 March 2015. DOI: 10.1038/ncomms7407
Provided by Ecole Polytechnique Federale de Lausanne
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