High-tech mirror beams heat away from buildings into space (Science Daily)


November 26, 2014


Stanford School of Engineering


Engineers have invented a material designed to help cool buildings. The material reflects incoming sunlight, and it sends heat from inside the structure directly into space as infrared radiation.


Stanford engineers have invented a material designed to help cool buildings. The material reflects incoming sunlight and sends heat from inside the structure directly into space as infrared radiation – represented by reddish rays. Credit: Illustration: Nicolle R. Fuller, Sayo-Art LLC

Stanford engineers have invented a revolutionary coating material that can help cool buildings, even on sunny days, by radiating heat away from the buildings and sending it directly into space.

A new ultrathin multilayered material can cool buildings without air conditioning by radiating warmth from inside the buildings into space while also reflecting sunlight to reduce incoming heat.

A team led by electrical engineering Professor Shanhui Fan and research associate Aaswath Raman reported this energy-saving breakthrough in the journal Nature.

The heart of the invention is an ultrathin, multilayered material that deals with light, both invisible and visible, in a new way.

Invisible light in the form of infrared radiation is one of the ways that all objects and living things throw off heat. When we stand in front of a closed oven without touching it, the heat we feel is infrared light. This invisible, heat-bearing light is what the Stanford invention shunts away from buildings and sends into space.

Of course, sunshine also warms buildings. The new material, in addition to dealing with infrared light, is also a stunningly efficient mirror that reflects virtually all of the incoming sunlight that strikes it.

The result is what the Stanford team calls photonic radiative cooling — a one-two punch that offloads infrared heat from within a building while also reflecting the sunlight that would otherwise warm it up. The result is cooler buildings that require less air conditioning.

“This is very novel and an extraordinarily simple idea,” said Eli Yablonovitch, a professor of engineering at the University of California, Berkeley, and a pioneer of photonics who directs the Center for Energy Efficient Electronics Science. “As a result of professor Fan’s work, we can now [use radiative cooling], not only at night but counter-intuitively in the daytime as well.”

The researchers say they designed the material to be cost-effective for large-scale deployment on building rooftops. Though it’s still a young technology, they believe it could one day reduce demand for electricity. As much as 15 percent of the energy used in buildings in the United States is spent powering air conditioning systems.

In practice the researchers think the coating might be sprayed on a more solid material to make it suitable for withstanding the elements.

“This team has shown how to passively cool structures by simply radiating heat into the cold darkness of space,” said Nobel Prize-winning physicist Burton Richter, professor emeritus at Stanford and former director of the research facility now called the SLAC National Accelerator Laboratory.

A warming world needs cooling technologies that don’t require power, according to Raman, lead author of the Nature paper. “Across the developing world, photonic radiative cooling makes off-grid cooling a possibility in rural regions, in addition to meeting skyrocketing demand for air conditioning in urban areas,” he said.

Using a window into space

The real breakthrough is how the Stanford material radiates heat away from buildings.

As science students know, heat can be transferred in three ways: conduction, convection and radiation. Conduction transfers heat by touch. That’s why you don’t touch a hot oven pan without wearing a mitt. Convection transfers heat by movement of fluids or air. It’s the warm rush of air when the oven is opened. Radiation transfers heat in the form of infrared light that emanates outward from objects, sight unseen.

The first part of the coating’s one-two punch radiates heat-bearing infrared light directly into space. The ultrathin coating was carefully constructed to send this infrared light away from buildings at the precise frequency that allows it to pass through the atmosphere without warming the air, a key feature given the dangers of global warming.

“Think about it like having a window into space,” Fan said.

Aiming the mirror

But transmitting heat into space is not enough on its own.

This multilayered coating also acts as a highly efficient mirror, preventing 97 percent of sunlight from striking the building and heating it up.

“We’ve created something that’s a radiator that also happens to be an excellent mirror,” Raman said.

Together, the radiation and reflection make the photonic radiative cooler nearly 9 degrees Fahrenheit cooler than the surrounding air during the day.

The multilayered material is just 1.8 microns thick, thinner than the thinnest aluminum foil.

It is made of seven layers of silicon dioxide and hafnium oxide on top of a thin layer of silver. These layers are not a uniform thickness, but are instead engineered to create a new material. Its internal structure is tuned to radiate infrared rays at a frequency that lets them pass into space without warming the air near the building.

“This photonic approach gives us the ability to finely tune both solar reflection and infrared thermal radiation,” said Linxiao Zhu, doctoral candidate in applied physics and a co-author of the paper.

“I am personally very excited about their results,” said Marin Soljacic, a physics professor at the Massachusetts Institute of Technology. “This is a great example of the power of nanophotonics.”

From prototype to building panel

Making photonic radiative cooling practical requires solving at least two technical problems.

The first is how to conduct the heat inside the building to this exterior coating. Once it gets there, the coating can direct the heat into space, but engineers must first figure out how to efficiently deliver the building heat to the coating.

The second problem is production. Right now the Stanford team’s prototype is the size of a personal pizza. Cooling buildings will require large panels. The researchers say large-area fabrication facilities can make their panels at the scales needed.

The cosmic fridge

More broadly, the team sees this project as a first step toward using the cold of space as a resource. In the same way that sunlight provides a renewable source of solar energy, the cold universe supplies a nearly unlimited expanse to dump heat.

“Every object that produces heat has to dump that heat into a heat sink,” Fan said. “What we’ve done is to create a way that should allow us to use the coldness of the universe as a heat sink during the day.”

In addition to Fan, Raman and Zhu, this paper has two additional co-authors: Marc Abou Anoma, a master’s student in mechanical engineering who has graduated; and Eden Rephaeli, a doctoral student in applied physics who has graduated.

This research was supported by the Advanced Research Project Agency-Energy (ARPA-E) of the U.S. Department of Energy.

Story Source:

The above story is based on materials provided by Stanford School of Engineering. The original article was written by Chris Cesare. Note: Materials may be edited for content and length.

Journal Reference:

  1. Aaswath P. Raman, Marc Abou Anoma, Linxiao Zhu, Eden Rephaeli, Shanhui Fan. Passive radiative cooling below ambient air temperature under direct sunlight. Nature, 2014; 515 (7528): 540 DOI: 10.1038/nature13883

Manipulação do clima pode causar efeitos indesejados (N.Y.Times/FSP)

Ilvy Njiokiktjien/The New York Times
Olivine, a green-tinted mineral said to remove carbon dioxide from the atmosphere, in the hands of retired geochemist Olaf Schuiling in Maasland, Netherlands, Oct. 9, 2014. Once considered the stuff of wild-eyed fantasies, such ideas for countering climate change — known as geoengineering solutions — are now being discussed seriously by scientists. (Ilvy Njiokiktjien/The New York Times)
Olivina, um mineral esverdeado que ajudaria remover o dióxido de carbono da atmosfera


18/11/2014 02h01

Para Olaf Schuiling, a solução para o aquecimento global está sob nossos pés.

Schuiling, geoquímico aposentado, acredita que a salvação climática está na olivina, mineral de tonalidade verde abundante no mundo inteiro. Quando exposta aos elementos, ela extrai lentamente o gás carbônico da atmosfera.

A olivina faz isso naturalmente há bilhões de anos, mas Schuiling quer acelerar o processo espalhando-a em campos e praias e usando-a em diques, trilhas e até playgrounds. Basta polvilhar a quantidade certa de rocha moída, diz ele, e ela acabará removendo gás carbônico suficiente para retardar a elevação das temperaturas globais.

“Vamos deixar a Terra nos ajudar a salvá-la”, disse Schuiling, 82, em seu gabinete na Universidade de Utrecht.
Ideias para combater as mudanças climáticas, como essas propostas de geoengenharia, já foram consideradas meramente fantasiosas.

Todavia, os efeitos das mudanças climáticas podem se tornar tão graves que talvez tais soluções passem a ser consideradas seriamente.

A ideia de Schuiling é uma das várias que visam reduzir os níveis de gás carbônico, o principal gás responsável pelo efeito estufa, de forma que a atmosfera retenha menos calor.

Outras abordagens, potencialmente mais rápidas e viáveis, porém mais arriscadas, criariam o equivalente a um guarda-sol ao redor do planeta, dispersando gotículas reflexivas na estratosfera ou borrifando água do mar para formar mais nuvens acima dos oceanos. A menor incidência de luz solar na superfície da Terra reduziria a retenção de calor, resultando em uma rápida queda das temperaturas.

Ninguém tem certeza de que alguma técnica de geoengenharia funcionaria, e muitas abordagens nesse campo parecem pouco práticas. A abordagem de Schuiling, por exemplo, levaria décadas para ter sequer um pequeno impacto, e os próprios processos de mineração, moagem e transporte dos bilhões de toneladas de olivina necessários produziriam enormes emissões de carbono.

Jasper Juinen/The New York Times
Kids play on a playground made with Olivine, a material said to remove carbon dioxide from the atmosphere, in Arnhem, Netherlands, Oct. 9, 2014. Once considered the stuff of wild-eyed fantasies, such ideas for countering climate change — known as geoengineering solutions — are now being discussed seriously by scientists. (Jasper Juinen/The New York Times)
Crianças brincam em playground na Holanda revestido com olivina; minério esverdeado retira lentamento o gás carbônico presente na atmosfera

Muitas pessoas consideram a ideia da geoengenharia um recurso desesperado em relação à mudança climática, o qual desviaria a atenção mundial da meta de eliminar as emissões que estão na raiz do problema.

O clima é um sistema altamente complexo, portanto, manipular temperaturas também pode ter consequências, como mudanças na precipitação pluviométrica, tanto catastróficas como benéficas para uma região à custa de outra. Críticos também apontam que a geoengenharia poderia ser usada unilateralmente por um país, criando outra fonte de tensões geopolíticas.

Especialistas, porém, argumentam que a situação atual está se tornando calamitosa. “Em breve poderá nos restar apenas a opção entre geoengenharia e sofrimento”, opinou Andy Parker, do Instituto de Estudos Avançados sobre Sustentabilidade, em Potsdam, Alemanha.

Em 1991, uma erupção vulcânica nas Filipinas expeliu a maior nuvem de gás anidrido sulforoso já registrada na alta atmosfera. O gás formou gotículas de ácido sulfúrico, que refletiam os raios solares de volta para o Espaço. Durante três anos, a média das temperaturas globais teve uma queda de cerca de 0,5 grau Celsius. Uma técnica de geoengenharia imitaria essa ação borrifando gotículas de ácido sulfúrico na estratosfera.

David Keith, pesquisador na Universidade Harvard, disse que essa técnica de geoengenharia, chamada de gestão da radiação solar (SRM na sigla em inglês), só deve ser utilizada lenta e cuidadosamente, para que possa ser interrompida caso prejudique padrões climáticos ou gere outros problemas.

Certos críticos da geoengenharia duvidam que qualquer impacto possa ser equilibrado. Pessoas em países subdesenvolvidos são afetadas por mudanças climáticas em grande parte causadas pelas ações de países industrializados. Então, por que elas confiariam que espalhar gotículas no céu as ajudaria?

“Ninguém gosta de ser o rato no laboratório alheio”, disse Pablo Suarez, do Centro do Clima da Cruz Vermelha/Crescente Vermelho.

Ideias para retirar gás carbônico do ar causam menos alarme. Embora tenham questões espinhosas –a olivina, por exemplo, contém pequenas quantidades de metais que poderiam contaminar o meio ambiente–,elas funcionariam de maneira bem mais lenta e indireta, afetando o clima ao longo de décadas ao alterar a atmosfera.

Como o doutor Schuiling divulga há anos sua ideia na Holanda, o país se tornou adepto da olivina. Estando ciente disso, qualquer um pode notar a presença da rocha moída em trilhas, jardins e áreas lúdicas.

Eddy Wijnker, ex-engenheiro acústico, criou a empresa greenSand na pequena cidade de Maasland. Ela vende areia de olivina para uso doméstico ou comercial. A empresa também vende “certificados de areia verde” que financiam a colocação da areia ao longo de rodovias.

A obstinação de Schuiling também incitou pesquisas. No Instituto Real de Pesquisa Marítima da Holanda em Yerseke, o ecologista Francesc Montserrat está pesquisando a possibilidade de espalhar olivina no leito do mar. Na Bélgica, pesquisadores na Universidade de Antuérpia estudam os efeitos da olivina em culturas agrícolas como cevada e trigo.

Boa parte dos profissionais de geoengenharia aponta a necessidade de haver mais pesquisas e o fato de as simulações em computador serem limitadas.

Poucas verbas no mundo são destinadas a pesquisas de geoengenharia. No entanto, até a sugestão de realizar experimentos em campo pode causar clamor popular. “As pessoas gostam de linhas bem demarcadas, e uma bem óbvia é que não há problema em testar coisas em um computador ou em uma bancada de laboratório”, comentou Matthew Watson, da Universidade de Bristol, no Reino Unido. “Mas elas reagem mal assim que você começa a entrar no mundo real.”

Watson conhece bem essas delimitações. Ele liderou um projeto financiado pelo governo britânico, que incluía um teste relativamente inócuo de uma tecnologia. Em 2011, os pesquisadores pretendiam soltar um balão a cerca de um quilômetro de altitude e tentar bombear um pouco de água por uma mangueira até ele. A proposta desencadeou protestos no Reino Unido, foi adiada por meio ano e, finalmente, cancelada.

Hoje há poucas perspectivas de apoio governamental a qualquer tipo de teste de geoengenharia nos EUA, onde muitos políticos negam sequer que as mudanças climáticas sejam uma realidade.

“O senso comum é que a direita não quer falar sobre isso porque reconhece o problema”, disse Rafe Pomerance, que trabalhou com questões ambientais no Departamento de Estado. “E a esquerda está preocupada com o impacto das emissões.”

Portanto, seria bom discutir o assunto abertamente, afirmou Pomerance. “Isso ainda vai levar algum tempo, mas é inevitável”, acrescentou.

Worlding Anthropologies of Technosciences? (Blog.castac.org)

October 28th, 2014, by

The past 4S meeting in Buenos Aires made visible the expansion of STS to various regions of the globe. Those of us who happened to be at the 4S meeting at University of Tokyo four years ago will remember the excitement of having the opportunity to work side-by-side with STS scholars from East and Southeast Asia. The same opportunity for worlding STS was opened again this past summer in Buenos Aires.

In order to help increase diversity of perspectives, Sharon Traweek and I organized a 4S panel on the relationships between STS and anthropology with a focus on the past, present, and future of the exchange among national traditions. The idea came out of our conversations about the intersections between science studies and the US anthropology of the late 1980’s with the work of CASTAC pioneers such as Diana Forsythe, Gary Downey, Joseph Dumit, David Hakken, David Hess, and Sharon Traweek, among several others who helped to establish the technosciences as legitimate domains of anthropological inquiry. It was not an easy battle, as Chris Furlow’s post on the history of CASTAC reminded us, but the results are undeniably all around us today. Panels on anthropology of science and technology can always be found at professional meetings. Publications on science and technology have space in various journals and the attention of university publishers these days.

For our panel this year we had the opening remarks of Gary Downey who, after reading our proposal aloud, emphasized the importance of advancing a cultural critique of science and technology through a situated, grounded stance. Quoting Marcus and Fischer’s “Anthropology as Cultural Critique” (1986) he emphasized that anthropology of science and technology could not dispense with the reflection upon the place, the situation, and the positioning of the anthropologist. Downey described his own positioning as an anthropologist and critical participant in engineering. Two decades ago Downey challenged the project of “anthropology as cultural critique” to speak widely to audiences outside anthropology and to practice anthropology as cultural critique, as suggested by the title of his early AAA paper, “Outside the Hotel”.

Yet “Anthropology as Cultural Critique” represented, he pointed out, one of the earliest reflexive calls in US anthropology for us to rethink canonical fieldwork orientations and our approach to the craft of ethnography with its representational politics. Downey and many others who invented new spaces to advance critical agendas in the context of science and technology did so by adding to the identity of the anthropologist other identities and responsibilities, such as that of former mechanical engineer, laboratory physicist, theologian, and experimenter of alternative forms of sociality, etc. These overlapping and intersecting identities opened up a whole field of possibilities for renewed modes of inquiry which, after “Anthropology as Cultural Critique”, consisted, as Downey suggested, in the juxtaposition of knowledge, forms of expertise, positionalities, and commitments. This is where we operate as STS scholars: at intersecting research areas, bridging “fault lines” (as Traweek’s felicitous expression puts it), and doing anthropology with and not without anthropologists.

The order of presentations for our panel was defined in a way to elicit contrasts and parallels between different modes of inquiry, grounded in different national anthropological traditions. The first session had Marko Monteiro (UNICAMP), Renzo Taddei (UNIFESP), Luis Felipe R. Murillo (UCLA), and Aalok Khandekar (Maastricht University) as presenters and Michael M. J. Fischer (MIT) as commentator. Marko Monteiro, an anthropologist working for an interdisciplinary program in science and technology policy in Brazil addressed questions of scientific modeling and State policy regarding the issue of deforestation in the Amazon. His paper presented the challenges of conducting multi-sited ethnography alongside multinational science collaborations, and described how scientific modeling for the Amazalert project was designed to accommodate natural and sociocultural differences with the goal of informing public policy. In the context of his ethnographic work, Monteiro soon found himself in a double position as a panelist expert and as an anthropologist interested in how different groups of scientists and policy makers negotiate the incorporation of “social life” through a “politics of associations.”

Similarly to Monteiro’s positioning, Khandekar benefited in his ethnographic work for being an active participant and serving as the organizer of expert panels involving STS scholars and scientists to design nanotechnology-based development programs in India. Drawing from Fischer’s notion of “third space”, Khandekar addressed how India could be framed productively as such for being a fertile ground for conceptual work where cross-disciplinary efforts have articulated humanities and technosciences under the rubric of innovation. Serving as a knowledge broker for an international collaboration involving India, Kenya, South Africa, and the Netherlands on nanotechnology, Khandekar had first-hand experience in promoting “third spaces” as postcolonial places for cross-disciplinary exchange through story telling.

Shifting the conversation to the context of computing and political action, Luis Felipe R. Murillo’s paper described a controversy surrounding the proposal of a “feminist programming language” and discussed the ways in which it provides access to the contemporary technopolitical dynamics of computing. The feminist programming language parody served as an entry point to analyze how language ideologies render symbolic boundaries visible, highlighting fundamental aspects of socialization in the context of computing in order to reproduce concepts and notions of the possible, logical, and desirable technical solutions. In respect to socioeconomic and political divisions, he suggested that feminist approaches in their intersectionality became highly controversial for addressing publicly systemic inequalities that are transversal to the context of computing and characterize a South that is imbricated in the North of “big computing” (an apparatus that encompasses computer science, information technology industries, infrastructures, and cultures with their reinvented peripheries within the global North and South).

Renzo Taddei recasted the debate regarding belief in magic drawing from a long lasting thread of anthropological research on logical reasoning and cultural specificity. Taddei opened up his take on our conversation with the assertion that to conduct ethnography on witchcraft assuming that it does not exist is fundamentally ethnocentric. This observation was meant to take us the core of his concerns regarding climate sciences vis-à-vis traditional Brazilian forms of forecasting from Sertão, a semi-arid and extremely impoverished area of the Northeast of Brazil. He then proceeded to discuss magical manipulation of the atmosphere from native and Afro-Brazilian perspectives in Brazil.

For the second day of our panel, we had papers by Kim Fortun (RPI), Mike Fortun (RPI), Sharon Traweek (UCLA) and the commentary of Claudia Fonseca (UFRGS) whose long-term contributions to study of adoption, popular culture, science and human rights in Brazil has been highly influential. In her paper, Kim Fortun addressed the double bind of expertise, the in-between of competence and hubris, structural risk and unpredictability of the very infrastructures experts are called upon to take responsibility. Fortun’s call was for a mode of interaction and engagement among science and humanities scholars oriented toward friendship and hospitality as well as commitment for our technoscientific futures under the aegis of late industrialism. “Ethnographic insight”, according to Fortun, “can loop back into the world” through the means of creative pedagogies which are attentive to the fact that science practitioners and STS scholars mobilize different analytic lenses while speaking through and negotiating with distinct discursive registers in the context of international collaborations. Our assumptions of what is conceptually shared should not anticipate what is to be seen or forged in the context of our international exchange, since what is foregrounded in discourse always implicates one form or another of erasure. The image Fortun suggested for us to think with is not that of a network, but that of a kaleidoscope in which the complexity of disasters can be seen across multiple dimensions and scales in their imbrication at every turn.

In his presentation, Michael Fortun questioned the so-called “ontological turn” to recast the “hauntological” dimensions of our research practices vis-à-vis those of our colleagues in the biosciences, that is, to account for the imponderables of scientific and anthropological languages and practices through the lens of a poststructural understanding of the historical functioning of language. In his study of asthma, Fortun attends to multiple perspectives and experiences with asthma across national, socioeconomic, scientific and technical scales. In the context of his project “The Asthma Files”, he suggests, alongside Kim Fortun, hospitality and friendship as frames for engaging instead of disciplining the contingency of ethnographic encounters and ethnographic projects. For future collaborations, two directions are suggested: 1) investigating and experimenting with modes of care and 2) designing collaborative digital platforms for experimental ethnography. The former is related to the scientists care for their instruments, methods, theories, intellectual reproduction, infrastructures, and problems in their particular research fields, while the latter poses the question of care among ourselves and the construction of digital platforms to facilitate and foster collaboration in anthropology.

This panel was closed with Sharon Traweek’s paper on multi-scalar complexity of contemporary scientific collaborations, based on her current research on data practices and gender imbalance in astronomy. Drawing from concepts of meshwork and excess proposed by researchers with distinct intellectual projects such as Jennifer McWeeny, Arturo Escobar, Susan Paulson, and Tim Ingold, Traweek discussed billion-dollar science projects which involve multiple research communities clustered around a few recent research devices and facilities, such as the Atacama Large Millimeter/submillimeter Array (ALMA) in Chile and the International Thermonuclear Experimental Reactor (ITER) in France. In the space of ongoing transformations of big science toward partially-global science, women and ethnic minorities are building meshworks as overlapping networks in their attempts to build careers in astronomy. Traweek proposed a revision of the notion of “enrollment” to account for the ways in which mega projects in science are sustained for decades of planning, development, construction, and operation at excessive scales which require more than support and consensus. Mega projects in the technosciences are, in Traweek’s terms, “over-determined collages that get built and used” by international teams with “glocal” structures of governance and funding.

In his concluding remarks Michael M. J. Fischer addressed the relationship between anthropology and STS through three organizing axes: time, topic, and audiences. As a question of time, a quarter century has passed for the shared history of STS and anthropology and probing questions have been asked and explored in the technosciences in respect to its apparatuses, codes, languages, life cycle of machines, educational curricula, personal and technical trajectories, which is well represented in one of the foundational texts of our field, Traweek’s “Beamtimes and Lifetimes” (1988). Traweek has helped establish a distinctive anthropological style “working alongside scientists and engineers through juxtaposition not against them.” In respect to the relationships between anthropology and STS, Fischer raised the question of pedagogies as, at once, a prominent form of engagement in the technosciences as well as an anthropological mode of engagement with the technosciences. The common thread connecting all the panel contributions was the potential for new pedagogies to emerge with the contribution of world anthropologies of sciences and technologies. That is, in the space of socialization of scientists, engineers, and the public, space of the convention, as well as invention, and knowledge-making, all the presenters addressed the question of how to advance an anthropology of science and technology with forms of participation, as Fischer suggests, as productive critique.

Along similar lines, Claudia Fonseca offered closing remarks about her own trajectory and the persistence of national anthropological traditions informing our cross-dialogs and border crossings. Known in Brazil as an “anthropologist with an accent”, an anthropologist born in the US, trained in France, and based in Brazil for the most part of her academic life, she cannot help but emphasize the style and forms of engagement that are specific to Brazilian anthropology which has a tradition of conducting ethnography at home. The panel served, in sum, for the participants to find a common thread connecting a rather disparate set of papers and for advancing a form of dialogue across national traditions and modes of engagement which is attentive to local political histories and (national) anthropological trajectories. As suggested by Michael Fortun, we are just collectively conjuring – with much more empiria than magic – a new beginning in the experimental tradition for world anthropologies of sciences and technologies.

Latour on digital methods (Installing [social] order)


In a fascinating, apparently not-peer-reviewed non-article available free online here, Tommaso Venturini and Bruno Latour discuss the potential of “digital methods” for the contemporary social sciences.

The paper summarizes, and quite nicely, the split of sociological methods to the statistical aggregate using quantitative methods (capturing supposedly macro-phenomenon) and irreducibly basic interactions using qualitative methods (capturing supposedly micro-phenomenon). The problem is that neither of which aided the sociologist in capture emergent phenomenon, that is, capturing controversies and events as they happen rather than estimate them after they have emerged (quantitative macro structures) or capture them divorced from non-local influences (qualitative micro phenomenon).

The solution, they claim, is to adopt digital methods in the social sciences. The paper is not exactly a methodological outline of how to accomplish these methods, but there is something of a justification available for it, and it sounds something like this:

Thanks to digital traceability, researchers no longer need to choose between precision and scope in their observations: it is now possible to follow a multitude of interactions and, simultaneously, to distinguish the specific contribution that each one makes to the construction of social phenomena. Born in an era of scarcity, the social sciences are entering an age of abundance. In the face of the richness of these new data, nothing justifies keeping old distinctions. Endowed with a quantity of data comparable to the natural sciences, the social sciences can finally correct their lazy eyes and simultaneously maintain the focus and scope of their observations.

Direct brain interface between humans (Science Daily)

Date: November 5, 2014

Source: University of Washington

Summary: Researchers have successfully replicated a direct brain-to-brain connection between pairs of people as part of a scientific study following the team’s initial demonstration a year ago. In the newly published study, which involved six people, researchers were able to transmit the signals from one person’s brain over the Internet and use these signals to control the hand motions of another person within a split second of sending that signal.

In this photo, UW students Darby Losey, left, and Jose Ceballos are positioned in two different buildings on campus as they would be during a brain-to-brain interface demonstration. The sender, left, thinks about firing a cannon at various points throughout a computer game. That signal is sent over the Web directly to the brain of the receiver, right, whose hand hits a touchpad to fire the cannon.Mary Levin, U of Wash. Credit: Image courtesy of University of Washington

Sometimes, words just complicate things. What if our brains could communicate directly with each other, bypassing the need for language?

University of Washington researchers have successfully replicated a direct brain-to-brain connection between pairs of people as part of a scientific study following the team’s initial demonstration a year ago. In the newly published study, which involved six people, researchers were able to transmit the signals from one person’s brain over the Internet and use these signals to control the hand motions of another person within a split second of sending that signal.

At the time of the first experiment in August 2013, the UW team was the first to demonstrate two human brains communicating in this way. The researchers then tested their brain-to-brain interface in a more comprehensive study, published Nov. 5 in the journal PLOS ONE.

“The new study brings our brain-to-brain interfacing paradigm from an initial demonstration to something that is closer to a deliverable technology,” said co-author Andrea Stocco, a research assistant professor of psychology and a researcher at UW’s Institute for Learning & Brain Sciences. “Now we have replicated our methods and know that they can work reliably with walk-in participants.”

Collaborator Rajesh Rao, a UW associate professor of computer science and engineering, is the lead author on this work.

The research team combined two kinds of noninvasive instruments and fine-tuned software to connect two human brains in real time. The process is fairly straightforward. One participant is hooked to an electroencephalography machine that reads brain activity and sends electrical pulses via the Web to the second participant, who is wearing a swim cap with a transcranial magnetic stimulation coil placed near the part of the brain that controls hand movements.

Using this setup, one person can send a command to move the hand of the other by simply thinking about that hand movement.

The UW study involved three pairs of participants. Each pair included a sender and a receiver with different roles and constraints. They sat in separate buildings on campus about a half mile apart and were unable to interact with each other in any way — except for the link between their brains.

Each sender was in front of a computer game in which he or she had to defend a city by firing a cannon and intercepting rockets launched by a pirate ship. But because the senders could not physically interact with the game, the only way they could defend the city was by thinking about moving their hand to fire the cannon.

Across campus, each receiver sat wearing headphones in a dark room — with no ability to see the computer game — with the right hand positioned over the only touchpad that could actually fire the cannon. If the brain-to-brain interface was successful, the receiver’s hand would twitch, pressing the touchpad and firing the cannon that was displayed on the sender’s computer screen across campus.

Researchers found that accuracy varied among the pairs, ranging from 25 to 83 percent. Misses mostly were due to a sender failing to accurately execute the thought to send the “fire” command. The researchers also were able to quantify the exact amount of information that was transferred between the two brains.

Another research team from the company Starlab in Barcelona, Spain, recently published results in the same journal showing direct communication between two human brains, but that study only tested one sender brain instead of different pairs of study participants and was conducted offline instead of in real time over the Web.

Now, with a new $1 million grant from the W.M. Keck Foundation, the UW research team is taking the work a step further in an attempt to decode and transmit more complex brain processes.

With the new funding, the research team will expand the types of information that can be transferred from brain to brain, including more complex visual and psychological phenomena such as concepts, thoughts and rules.

They’re also exploring how to influence brain waves that correspond with alertness or sleepiness. Eventually, for example, the brain of a sleepy airplane pilot dozing off at the controls could stimulate the copilot’s brain to become more alert.

The project could also eventually lead to “brain tutoring,” in which knowledge is transferred directly from the brain of a teacher to a student.

“Imagine someone who’s a brilliant scientist but not a brilliant teacher. Complex knowledge is hard to explain — we’re limited by language,” said co-author Chantel Prat, a faculty member at the Institute for Learning & Brain Sciences and a UW assistant professor of psychology.

Other UW co-authors are Joseph Wu of computer science and engineering; Devapratim Sarma and Tiffany Youngquist of bioengineering; and Matthew Bryan, formerly of the UW.

The research published in PLOS ONE was initially funded by the U.S. Army Research Office and the UW, with additional support from the Keck Foundation.

Journal Reference:

  1. Rajesh P. N. Rao, Andrea Stocco, Matthew Bryan, Devapratim Sarma, Tiffany M. Youngquist, Joseph Wu, Chantel S. Prat. A Direct Brain-to-Brain Interface in Humans. PLoS ONE, 2014; 9 (11): e111332 DOI: 10.1371/journal.pone.0111332

Cockroach cyborgs use microphones to detect, trace sounds (Science Daily)

Date: November 6, 2014

Source: North Carolina State University

Summary: Researchers have developed technology that allows cyborg cockroaches, or biobots, to pick up sounds with small microphones and seek out the source of the sound. The technology is designed to help emergency personnel find and rescue survivors in the aftermath of a disaster.

North Carolina State University researchers have developed technology that allows cyborg cockroaches, or biobots, to pick up sounds with small microphones and seek out the source of the sound. The technology is designed to help emergency personnel find and rescue survivors in the aftermath of a disaster. Credit: Eric Whitmire.

North Carolina State University researchers have developed technology that allows cyborg cockroaches, or biobots, to pick up sounds with small microphones and seek out the source of the sound. The technology is designed to help emergency personnel find and rescue survivors in the aftermath of a disaster.

The researchers have also developed technology that can be used as an “invisible fence” to keep the biobots in the disaster area.

“In a collapsed building, sound is the best way to find survivors,” says Dr. Alper Bozkurt, an assistant professor of electrical and computer engineering at NC State and senior author of two papers on the work.

The biobots are equipped with electronic backpacks that control the cockroach’s movements. Bozkurt’s research team has created two types of customized backpacks using microphones. One type of biobot has a single microphone that can capture relatively high-resolution sound from any direction to be wirelessly transmitted to first responders.

The second type of biobot is equipped with an array of three directional microphones to detect the direction of the sound. The research team has also developed algorithms that analyze the sound from the microphone array to localize the source of the sound and steer the biobot in that direction. The system worked well during laboratory testing. Video of a laboratory test of the microphone array system is available athttp://www.youtube.com/watch?v=oJXEPcv-FMw.

“The goal is to use the biobots with high-resolution microphones to differentiate between sounds that matter — like people calling for help — from sounds that don’t matter — like a leaking pipe,” Bozkurt says. “Once we’ve identified sounds that matter, we can use the biobots equipped with microphone arrays to zero in on where those sounds are coming from.”

A research team led by Dr. Edgar Lobaton has previously shown that biobots can be used to map a disaster area. Funded by National Science Foundation CyberPhysical Systems Program, the long-term goal is for Bozkurt and Lobaton to merge their research efforts to both map disaster areas and pinpoint survivors. The researchers are already working with collaborator Dr. Mihail Sichitiu to develop the next generation of biobot networking and localization technology.

Bozkurt’s team also recently demonstrated technology that creates an invisible fence for keeping biobots in a defined area. This is significant because it can be used to keep biobots at a disaster site, and to keep the biobots within range of each other so that they can be used as a reliable mobile wireless network. This technology could also be used to steer biobots to light sources, so that the miniaturized solar panels on biobot backpacks can be recharged. Video of the invisible fence technology in practice can be seen at http://www.youtube.com/watch?v=mWGAKd7_fAM.

A paper on the microphone sensor research, “Acoustic Sensors for Biobotic Search and Rescue,” was presented Nov. 5 at the IEEE Sensors 2014 conference in Valencia, Spain. Lead author of the paper is Eric Whitmire, a former undergraduate at NC State. The paper was co-authored by Tahmid Latif, a Ph.D. student at NC State, and Bozkurt.

The paper on the invisible fence for biobots, “Towards Fenceless Boundaries for Solar Powered Insect Biobots,” was presented Aug. 28 at the 36th Annual International IEEE EMBS Conference in Chicago, Illinois. Latif was the lead author. Co-authors include Tristan Novak, a graduate student at NC State, Whitmire and Bozkurt.

The research was supported by the National Science Foundation under grant number 1239243.