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Trapping light by mimicking gravitational lensing


http://www.nature.com/nphoton/journal/vaop/ncurrent/full/nphoton.2013.247.html#affil-auth


Figure 1:*Analogue of light deflection in a gravitational field and microstructured optical waveguide.
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a, Depiction of light deflection by the gravitational field of a massive stellar object. b, Schematic view of the microstructured optical waveguide formed around a microsphere and used to emulate the deflection of light by a gravitational force…

Figure 2: Structural and optical measurements of the sample.
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a, Interference pattern around the microsphere illuminated by white (top) and blue (bottom) light. b, Surface profile of the PMMA layer measured with AFM. c, The effective refractive index of the microstructured waveguide is extracted,…


One of the most fascinating predictions of the theory of general relativity is the effect of gravitational lensing, the bending of light in close proximity to massive stellar objects.

Recently, artificial optical materials have been proposed to study the various aspects of curved spacetimes, including light trapping and Hawking radiation. However, the development of experimental ‘toy’ models that simulate gravitational lensing in curved spacetimes remains a challenge, especially for visible light.

Here, by utilizing a microstructured optical waveguide around a microsphere, we propose to mimic curved spacetimes caused by gravity, with high precision. We experimentally demonstrate both far-field gravitational lensing effects and the critical phenomenon in close proximity to the photon sphere of astrophysical objects under hydrostatic equilibrium. The proposed microstructured waveguide can be used as an omnidirectional absorber, with potential light harvesting and microcavity applications.

Affiliations
National Laboratory of Solid State Microstructures & Department of Physics, National Center of Microstructures and Quantum Manipulation, Nanjing University, Nanjing 210093, China
C. Sheng, H. Liu, Y. Wang & S. N. Zhu

College of Engineering and Science, Louisiana Tech University, Ruston, Louisiana 71270, USA
D. A. Genov



See the video and more information Here: Artificial Black Hole Made--in-China




Nanjing University 南京大学

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Credit: wikimedia or stated in the link
 
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China to build largest aero-engine outsourcing base

By PTI | 7 Oct, 2013, 08.23PM IST

BEIJING: China plans to build its largest outsourcing base for aero-engine with an investment of $100 million, which will supply aero parts for Boeing and Airbus.

The newly-approved bonded area in the southwest Guizhou province will realise imports and exports of $200 million in 2015, the headquarters for the comprehensive bonded zone in Guiyang said today.

Construction of 40,000-square-metre workshops has started for a joint venture of AVIC International Holding Corporation and AVIC Liyang Aero-Engine Corporation, it said.

With an investment of $100 million, the project will provide aero parts for Boeing and Airbus, the statement said.

Some production lines of AVIC Liyang Aero-Engine Corporation's aviation engine industry base in a high-tech zone in Guiyang have started operation.

Liyang Aero-Engine will invest 4 billion yuan in the base, state-run Xinhua news agency reported.

China's cabinet approved last month the establishment of the comprehensive bonded zone in Guiyang with an area of over three square km.

The zone will be put into operation in September next year. It will enjoy the same tax and foreign exchange policies as the Yangshan Free Trade Port Area, China's first bonded port established in Shanghai in 2005.

China to build largest aero-engine outsourcing base - The Economic Times
 
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:yahoo:

China's high magnetic field facilities deemed world-class: experts

Xinhua | 2013-10-9 9:10:47

By Agencies

China's pulsed high magnetic field experimental facilities have reached advanced levels and made world-class achievements, according to foreign experts.

A team of more than 30 experts from six countries, including the United States and Germany, gave the appraisal after inspecting and watching displays at the National High Magnetic Field Center in Wuhan, capital of central China's Hubei Province.

High magnetic fields are one of the most important extreme conditions for modern scientific experiments, according to Li Liang, director of the center at Huazhong University of Science and Technology.

Over the past century, scientific research under strong magnetic fields has been active globally and made great original achievements in physics, chemistry, and in promoting the development of relevant high-tech industries, said Li.

The center, which began construction in 2008, will open to outside users after completion, he added.

In August, the center achieved a magnetic field intensity of 90.6 tesla, breaking the country's previous record. The breakthrough made China the third country after the US and Germany to realize a magnetic field intensity of more than 90 tesla.:tup:

China's high magnetic field facilities deemed world-class: experts - BUSINESS - Globaltimes.cn
 
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The World Health Organization (WHO) has added a new vaccine made in China to its list of pre-qualified medicines.

9 Oct 2013

WHO approves new vaccine for Japanese Encephalitis

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Credit: WHO

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Credit: amalpest.com.au

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Credit: pigtrop.cirad.fr

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Credit:
Encephalitis Toll in City Increases 200% in 3 Years Japanese Encephalitis Cases Alarming, Experts Blame Notification System


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credit: traveldoctor.info

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The new vaccine will be used to protect children against Japanese Encephalitis which is a mosquito borne viral infection that causes inflammation of the brain.

Japanese Encephalitis is major public health problem and is endemic with seasonal outbreaks in parts of China, the Russian Federation and Southern Asia.

There is no specific treatment for the disease, but it can be prevented through the use of approved vaccines and supportive care in a medical facility to reduce the risk of death or disability.

This is the first Chinese produced vaccine to be pre-qualified by WHO.

Children at risk will need only one dose.

WHO Director- General Dr. Margaret Chan says the approval of the new vaccine is a welcome development both in the fight to protect children in developing countries from Japanese Encephalitis and in the future availability of vaccines, as China is now producing vaccines up to WHO standards.

Dr. Chan expressed hope that more vaccines made in China will become WHO pre-qualified.

Patrick Maigua, United Nations Radio, Geneva.


More info about the disease here:

Indigenous Communities Environmental Health Resources

Encephalitis Toll in City Increases 200% in 3 Years Japanese Encephalitis Cases Alarming, Experts Blame Notification System
 
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Truly great work。。。

The world’s first quantum memory that stores the shape and structure of single photons has been built in a Chinese lab:tup:

Received 09 July 2013 Accepted 30 August 2013 Published 02 October 2013:

Single-photon-level quantum image memory based on cold atomic ensembles : Nature Communications : Nature Publishing Group

Hello,quantum computer;hello,quantum internet!

First Quantum Memory That Records The Shape of a Single Photon Unveiled in China | MIT Technology Review
 
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Truly great work。。。

The world’s first quantum memory that stores the shape and structure of single photons has been built in a Chinese lab:tup:

Received 09 July 2013 Accepted 30 August 2013 Published 02 October 2013:

Single-photon-level quantum image memory based on cold atomic ensembles : Nature Communications : Nature Publishing Group

Hello,quantum computer;hello,quantum internet!

First Quantum Memory That Records The Shape of a Single Photon Unveiled in China | MIT Technology Review

Yay. Can't wait till this technology is commercialised.
 
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WiFi and LED lamp。

What's the coonection?

Well,the later may replace the former and allow internet access by LED LIGHT。

:china::tup:
 
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Good tidings from Fudan University in Shanghai yesterday!

A new international cutting edge communication technology that makes use of visible light to transmit network signals was successfully demonstrated in the lab。Researchers from Fudan University connected a network signal to an 1W LED lamp bead and guess what?

Four computers instantly came online in the lamplight,achieving the highest transmission rate of up to 3.25G and an average access rate of up to 150M,

What a feat!It fully merits the title “the world's fastest internet access by light“:D
 
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10 LiFi(VLC)prototypes to debut during IAS 2013(5-9.11.2013)in Shanghai。:tup:
 
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北京大学第一医院完成我国首例经皮心室重建术
Peking University First Hospital, completed China's first percutaneous surgical ventricular reconstruction

2013年10月15日11:59
15-Oct-13

sina.com.cn


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降落伞-左室隔离装置 Parachute - LV isolation device


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霍勇教授为患者施行经皮左室隔离术
Professor Yong Huo ventricular isolation underwent percutaneous surgery


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洪涛教授为患者施行经皮左室隔离术
Professor Tao underwent percutaneous left ventricular isolation technique

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患者行心室重建术前左室造影
Patients with preoperative left ventricular angiography ventricular reconstruction

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术后左室造影
Postoperative left ventricular angiography

北京大学第一医院心血管内科(以下简称“北大医院心内科”)在科主任霍勇教授的带领下,于2013年10月9日在国内率先通过微创介入的方法对两名陈旧前壁心肌梗死合并室壁瘤患者施行了经皮心室重建术,实现了国内在该项技术零的突破。

  “经皮心室重建术”是针对急性心肌梗死患者易发的心力衰竭的陈旧前壁心肌梗死伴心力衰竭患者的新的治疗方法。这类患者常因本身病情危重而无法承受外科手术治疗。“经皮心室重建术”基于国外最新研发的一种新的器械,该器械是一个左(心)室隔离装置,形似“降落伞”,采用微创介入的方法,经股动脉置入到左室心尖部,将异常收缩的室壁隔离开,从而减少左室容积,改善心力衰竭患者临床症状及心功能。该项技术最早报道于2007年,近年来在国外逐渐开展,积累了上百例的经验,并获得欧洲CE认证。

  截至目前,北大医院心内科已经成功完成两位患者的治疗。

  第一位60岁的男性患者,4年前因为急性前壁心肌梗死,虽然也接受了急诊支架治疗,但是仍然遗留了室壁瘤。4年来规律服用药物治疗,但仍然不时发生心力衰竭,多家医院因认为室壁瘤手术治疗风险高而止步。

  第二位65岁的男性患者,今年3月发生急性前壁心肌梗死,同样也是接受了急诊支架治疗,但是依然遗留了室壁瘤,仅今年就因为心力衰竭住院两次。而由于病情重、手术风险大,咨询过多家医院后未采取外科手术治疗。

  北大医院心内科经过周密的术前准备,由霍勇教授、洪涛教授分别为两名患者成功地将“降落伞”-左室隔离装置放置到患者心室中,减少患者心脏的容积,有效改善心力衰竭的临床症状。目前两名患者恢复良好。

  近年来心脏病的治疗有了长足的发展,但是作为所有心脏病最终结局之一的心力衰竭却始终威胁着人类健康,5年生存率甚至比某些恶性肿瘤还差。导致心力衰竭的原因众多,最常见的病因之一为急性心肌梗死。据报道,每年全球有1700万人死于心血管疾病,其中一半以上死于急性心肌梗死,即使患者存活后也容易发展为慢性心力衰竭。据估计,中国急性心肌梗死的发病率约为45/10万~55/10万,目前还呈上升趋势。急性心肌梗死后由于心肌损伤以及随后的瘢痕化,导致心脏扩大以及心力衰竭的发生,尤其是前壁心肌梗死合并室壁瘤的患者更容易发生心力衰竭,不仅影响患者的生活质量,还造成巨大的家庭和社会的经济负担。对于该类患者除了药物治疗之外,也可以采用外科手术治疗,但是由于需要手术的患者本身病情危重,而外科手术创伤较大,对外科手术者的要求也比较高,临床使用受限。

  一项新技术的施行,既要有敢为天下先的勇气,也需要多方面的支持。我国首例经皮心室重建术在我院得以成功进行,是在刘玉村院长、丁洁副院长、潘义生副院长、医务处王平处长、袁建峰和张渺副处长、科研处谢囡副处长的直接支持下取得的。在前期准备过程中,不仅心内科上下高度重视,而且得到了医务处、科研处、设备处等职能处室的积极支持和医学影像科邱建星副主任医师、王鹤主治医师、超声诊断中心陈路增副主任医师的通力协作。而在手术进行中,离不开介入血管外科杨敏副主任医师、心脏外科王进副主任医师和麻醉科胡晓副主任的有力配合。因此,该项技术的实施,不仅体现了北大医院心内科虽然作为国内最早开展介入治疗的心脏中心之一,但不满足于过去在冠心病及电生理介入治疗方面取得的成绩,锐意进取,不断创新的精神。同时也体现了我院作为综合医院的优势,各个科室精诚团结,互相促进,形成合力,才能共同发展。而医院职能处室在整个过程中提供了有力支持。我院“水准原点”的精神不仅体现在医疗技术方面,同样体现于团队合作精神方面。正是有了多个科室的保驾护航,我们才敢放心前行!

  刘玉村院长在新闻发布会上谈到,医务工作者要作有“心”人,医院要作有“心”医院,健康宣教要“浅出”,攻坚克难则要“深入”;要有“心”于医院文化建设,有“心”于医院学科发展。“雄关漫道真如铁,而今迈步从头越”。近年来,心血管介入治疗领域突飞猛进,心内科将在霍勇主任的领导下不断引起国外新的治疗技术包括经皮心室重建术、经皮二尖瓣修复术、经皮主动脉瓣置换术以及用于治疗顽固性高血压的经皮肾交感神经消融术等,为国内心血管疾病患者带来更多新的治疗方式。



Department of Cardiology, Peking University First Hospital ( hereinafter referred to as "North Hospital Cardiology " ) in the department director , led by Professor Yong Huo , on October 9, 2013 at the country through the first minimally invasive anterior approach to two obsolete myocardial infarction, ventricular aneurysm underwent percutaneous surgical ventricular reconstruction to achieve a domestic in the technology breakthrough.

" Percutaneous ventricular reconstruction surgery," is for patients with acute myocardial infarction heart failure -prone old anterior myocardial infarction in patients with heart failure of new treatments . Such patients often due to their critical condition and can not afford surgery. " Percutaneous ventricular reconstruction surgery," based on the latest research and development abroad , a new instrument , the instrument is a left ( heart ) chamber isolation device , the shape of " parachute ", using minimally invasive methods , through the femoral artery into the left ventricle apex, the wall will isolate abnormal contraction , thereby reducing left ventricular volumes and improve clinical symptoms of heart failure and cardiac function . The technology was first reported in 2007 , carried out in recent years in foreign countries gradually accumulated experience on the 100 cases and obtained the European CE certification.

Up to now, Beijing University Hospital, Department of Cardiology, has successfully completed two patients.

First a 60 -year-old male patient , four years ago because of acute anterior myocardial infarction , although it accepted the emergency stent , but still left the aneurysm . 4 years, regular use of medication, but still sporadic heart failure, due to a number of hospitals that treat high-risk surgical aneurysm and stop .

The second 65 -year-old male patient , took place in March this year, acute anterior myocardial infarction , it is also acceptable to the emergency stent , but still left the aneurysm , only twice this year because of hospitalization for heart failure . And because severe illness, surgical risk , advisory did not take too many hospital after surgery.

Department of Cardiology, Peking University First Hospital After careful preoperative preparation by Professor Yong Huo , Professor Tao were two patients successfully, " parachute " - placed in the left ventricle in patients with ventricular isolation device , reducing the volume of the patient's heart , improve heart failure clinical symptoms. At present two patients with good recovery.

Treatment of heart disease in recent years has made great progress , but as one of the final outcome of all heart failure has always threat to human health, five -year survival rate is even worse than even certain cancers . Lead to heart failure many reasons , the most common cause of acute myocardial infarction.

According to reports, there are 17 million people worldwide each year die of cardiovascular disease , more than half of them died of acute myocardial infarction, even in patients prone to develop survival after chronic heart failure. It is estimated that China acute myocardial infarction incidence rate is about 45/ 100000 - 55/ 100000 , there is an upward trend . After acute myocardial infarction due to myocardial injury and subsequent scarring , leading to enlargement of the heart and heart failure , myocardial infarction , especially in patients with ventricular aneurysm more prone to failure, not only affect the patient's quality of life, but also caused huge family and the social and economic burden. For these patients in addition to medical therapy , surgical treatment can also be used , but because patients need surgery itself is in critical condition, while the surgical trauma, surgical procedures on those requirements are relatively high, the clinical use is limited.

The implementation of a new technology , we must have the courage to take the lead , but also need the support . China's first percutaneous ventricular reconstruction surgery in our hospital to be successful , is the village president Liu , Jie Ding , vice president , vice president of Pan Yisheng , Wang Ping, Director of Medical Service , and Zhang Miao Yuan Jianfeng , Deputy Director , Research Department Deputy Director Xie nan achieved under the direct support . In the preparation process, not only up and down Cardiology attention , and got medical service , research office, equipment and other functional offices at the active support and Radiology Qiu Xing, vice chief physician, physician Wang He , ultrasound diagnostic centers Chen Lu by the Deputy chief physician collaboration .

In surgery , the inseparable interventional vascular surgery YANG Min , deputy chief physician, Wang Jin , deputy director of cardiac surgery and anesthesiology physician Hu , deputy director of the powerful tie . Therefore, the implementation of this technology , not only reflects the Beijing University Hospital Cardiology though as the earliest intervention carried out in the heart of one of the centers , but is not satisfied in the past in the interventional treatment of coronary heart disease and electrophysiology achievements , forge ahead innovative spirit . But also reflects the hospital 's strengths as a general hospital , the various sections of solidarity and promote each other , form a concerted effort to develop together.

The hospital functions of the offices in the process provide a strong support . Our hospital " leveling origin " of the spirit not only in medical technology , the same spirit of cooperation embodied in the team aspect . It is precisely because many sections of the escort, we dare to be assured before the trip !

Liu village president spoke at a news conference , medical workers should be the " heart" of people , the hospital should be the " heart" hospitals, health education should " light out " , will have to tackle tough "in-depth " ; to the " heart" in the hospital culture , the " heart" in the hospital discipline development . "Man Road as the iron, the more strides ."

In recent years, the field of cardiovascular intervention by leaps and bounds , Yong Huo Cardiology Director will continue to give rise to foreign countries under the leadership of new treatment techniques include percutaneous ventricular reconstruction surgery , percutaneous mitral valve repair surgery , percutaneous aortic valve replacement and for the treatment of resistant hypertension percutaneous renal sympathetic nerve ablation , etc. for domestic patients with cardiovascular disease lead to more new treatment modalities .




北京大学 第一医院 First Hospital Beijing University

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Wanshan self-propelled modular transporter:

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Complete modularity allows the addition of as many trailer axles as the load requires,with peak load well in excess of 10000 tons。
 
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Power from the sea? Triboelectric nanogenerator extracts energy from ocean waves
14-Oct-13

Power from the sea? Triboelectric nanogenerator extracts energy from ocean waves

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(Phys.org) —As sources of renewable energy, sun and wind have one major disadvantage: it isn't always sunny or windy. Waves in the ocean, on the other hand, are never still. (Chinese and) American researchers are now aiming to use waves to produce energy by making use of contact electrification between a patterned plastic nanoarray and water. In the journal Angewandte Chemie, they have introduced an inexpensive and simple prototype of a triboelectric nanogenerator that could be used to produce energy and as a chemical or temperature sensor.
The triboelectric effect is the build up of an electric charge between two materials through contact and separation – it is commonly experienced when removal of a shirt, especially in dry air, results in crackling. Zhong Lin Wang, a team at the Georgia Institute of Technology in Atlanta (and scientist at Beijing Institute of Nanoenergy and Nanosystems, Chinese Academy of Sciences) have previously developed a triboelectric generator based on two solids that produces enough power to charge a mobile telephone battery.

However, high humidity interferes with its operation. How could this technology work with waves in water? The triboelectric effect is not limited to solids; it can also occur with liquids. The only requirement is that specific electronic energy levels of two substances are close enough together. Water just needs the right partner – maybe a suitable plastic.

As a prototype, the researchers made an insulated plastic tank, whose lid and bottom contain copper foil electrodes. Their system is successful because the inside of the lid is coated with a layer of polydimethylsiloxane (PDMS) patterned with tiny nanoscale pyramids. The tank is filled with deionized water.

When the lid is lowered so that the PDMS nanopyramids come into contact with the water, groups of atoms in the PDMS become ionized and negatively charged. A corresponding positively charged layer forms on the surface of the water. The electric charges are maintained when the PDMS layer is lifted out of the water.

This produces a potential difference between the PDMS and the water. Hydrophobic PDMS was chosen in order to minimize the amount of water clinging to the surface; the pyramid shapes allow the water to drop off readily.

Periodic raising and lowering of the lid while the electrodes are connected to a rectifier and capacitor produces a direct current that can be used to light an array of 60 LEDs. In tests with salt water, the generator produced a lower output, but it could in principle operate with seawater.

The current produced decreases significantly as temperature increases, which could allow this device to be used as a temperature sensor. It also decreases when ethanol is added to the water, which suggests potential use of the system as a chemical sensor. By attaching probe molecules with specific binding partners, it may be possible to design sensors for biomolecules.

Explore further: Bioengineers find method to strongly adhere hydrogels to hydrophobic silicone substrates

More information here:*

Zhong Lin Wang et al. Water-Solid Surface Contact Electrification and its Use for Harvesting Liquid Wave Energy,*Angewandte Chemie International Edition,*dx.doi.org/10.1002/anie.201307249


Electrical wave mechanics: A newly designed triboelectric nanogenerator is based on the contact electrification between a patterned polydimethylsiloxane pyramid array and water. Cost-effective and simple, the prototype triboelectric nanogenerator shows the potential to harvest energy from liquid waves and serve as chemical and temperature sensors.

Authors and affiliations

Dr. Zong-Hong Lin-1, Dr. Gang Cheng-1, Long Lin-1, Dr. Sangmin Lee-1, Prof. Zhong Lin Wang- 1,2 ,*
Article first published online: 7 OCT 2013
1 - School of Material Science and Engineering, Georgia Institute of Technology, Atlanta, GA 30332-0245 (USA)
2 - Beijing Institute of Nanoenergy and Nanosystems, Chinese Academy of Sciences, Beijing (China)

中国科学院北京纳米能源与系统研究所
Beijing Institute of Nanoenergy and Nanosystems, Chinese Academy of Sciences


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