1. Brookhaven Forum 2013

   9 am, Berkner Hall Auditorium

   Hosted by: Amarjit Soni

   There will be plenary talks all 3 mornings and parallel sessions on Wed and Thurs. The meeting covers a very broad area of Particle Physics as well as Astroparticle Physics & cosmology. For further details please visit our web site. We hope very much you will be able to join us. Thanks very much, Hooman and Soni

2. Play Group Event

   10 am, Recreation Hall, Bldg. 317

   Hosted by: QOL/BERA/Recreation

   To Join, go to: meetup.com/BNL-playgroup

3. Condensed-Matter Physics & Materials Science Seminar

   10:30 am, Bldg. 735, Conf. B

   Hosted by: Lijun Wu

   Precession electron diffraction (PED) in a TEM is a new emerging promissing technique using electron diffraction patterns collection very close to kinematical condition (like in x-ray diffraction) useful to solve ab-initio crystal structures of nanocrystals. TEM based 3-D diffraction tomography technique consists in a collection of a series of randomly oriented diffraction patterns in precession mode of the same crystal through the whole TEM angular range, usually from -45º to +45º, at 1º angular intervals. The resulting 3D PED set of reflections can be visualized as clear 3D picture of the reciprocal cell of the crystal and enable direct cell determination and structure determination by measuring reflections intensitities .More than 60 structures have been solved using 3D diffraction tomography the last few years dealing with nm size crystals of complex minerals, complex zeolites, MOFs , organic and pharmaceutical compounds and important application examples will be presented. PED tomography can be the ideal tool to solve crystal structures even in cases where X-Ray synchtrotron data may fail to solve the structure. Another new precession diffraction based application has been recemtly developed for a TEM based phase and orientation maps for nanocrystal (EBSD-SEM like). A TEM precession interface may perform a scanning through a sample area (typical area 5x5 m2), collecting a large number of PED patterns which are compared one by one by cross-correlation techniques with a series of generated diffraction patterns (templates) of all possible orientations of known phases existing on the sample scanned area.Resulting high quality nanoscale (1-2 nm) orientation / phase maps obtained with TEM-FEG/LaB6 are much superior to equivalent EBSD-SEM orientation maps.Such orientation/ phase maps may be produced very fast , making the technique highly attractive for high throughput TEM based orientation imaging analysis.

4. May is Asian Pacific American Heritage Month

   12 pm, RSB (Bldg. 400), Rm. 1

   Hosted by: Asian Pacific American Association

   This 3-day noon-time tournament from May 22 - May 24 features a fascinating board game called "GO" popular in many Asian countries and growing in the US since the founding of the 'American Go Association'. Drop by to see what the craze is all about! For further information, contact Xin Zhao at xzhao@bnl.gov (Ext. 2107), or go to: http://www.usgo.org/what-go

5. Brookhaven Forum 2013

   2 pm, Berkner Hall Auditorium

   Hosted by: Anze Slosar

   The vast majority of the wealth of cosmological information we have has come from power spectra (or equivalently, two-point correlation function, for the CMB temperature and for the mass distribution in the Universe today. But there is far more that can be sought in the future with the deluge of data from current and forthcoming surveys. I will discuss how the data can be used to look for new fields during inflation; to test geometrically for their properties; to seek parity breaking in the early and late Universe; to look for exotic dark-energy physics; to inquire about nontrivial cosmic topologies; to identify preferred-frame effects; etc. I will also draw connections to some of the possible CMB anomalies.

6. BSA Distinguished Lecture

   5:30 pm, Berkner Hall Auditorium

   Hosted by: Peter Wanderer

   With the start of the Large Hadron Collider (LHC) at CERN, particle physics entered a new era. The LHC will provide a deeper understanding of the universe and the insights gained could change our view of the world, and the talk will present some of the reasons for the excitement surrounding the LHC. The LHC is expected to yield insights into the origin of mass, the nature of dark matter and into many other key questions. This lecture will address the exciting physics prospects offered by the LHC, present first results, in particular the recent discovery of a new 'Higgs-like' Boson, and also a look forward.

1. Brookhaven Forum 2013

   9 am, Berkner Hall Auditorium

   Hosted by: Amarjit Soni

   There will be plenary talks all 3 mornings and parallel sessions on Wed and Thurs. The meeting covers a very broad area of Particle Physics as well as Astroparticle Physics & cosmology. For further details please visit our web site. We hope very much you will be able to join us. Thanks very much, Hooman and Soni

2. National Synchrotron Light Source Seminar

   10 am, Conference Room A/B, Bldg. 490

   Hosted by: Elio Vescovo

   The presentation will focus both on scientific and technical aspects of modern angle-resolved photoemission spectroscopy (ARPES). In the firs part I will provide a brief introduction into ARPES, explaining why it has evolved into an indispensable experimental technique, when a basic band structure and/or many-body effects of a new material has to be studied. As an illustration several particular studies will be provided, focused on: (1) renormalization effects in hole doped Bi-122; (2) superconductivity and renormalization in YBa2Cu3O7�'δ; (3) origin of pseudogap in electron doped Pr2�'xCexCuO4; (4) stripe phase in La1.8�'1/8Eu0.2Sr1/8CuO4 ; and finally (5) peculiarities of electronic structure of Ba1-xKxFe2As2 and LiFeAs. The second part of my presentations will cover certain aspects of 13 ARPES end-station development at BESSY and argumentation for introduction micrometer (or better) lateral resolution in angle-resolved photoemission spectroscopy.

3. NSLS-II Seminar

   10:30 am, Seminar Room, Bldg. 725

   Hosted by: Samuel Krinsky

   I'll give an overview of recent and ongoing accelerator physics efforts at SSRL, including orbit stability improvements from mitigating SPEAR3 diurnal tunnel floor motion; timing mode development, including low alpha "hybrid" mode operations and preliminary investigations of high voltage superconducting RF; and lower emittance lattice development.

4. National Synchrotron Light Source Seminar

   11 am, Large Conferrence Room, Building 703

   Hosted by: Aesook Byon

   The design, construction, integration and commissioning of the current generation of highly automated; remotely operated beamlines holds many challenges. All the aspects of hardware and software integration must be of the highest specification and quality to achieve stable user operations with low levels of intervention from operations staff with high reliability. I will describe the many successes and few less successful aspects of the management and implementation of the two MX beamlines at the Australian Synchrotron from 2005 till 2009. I will then touch on advances in the newest generation of beamline diagnostics and detectors

5. RIKEN/BNL Lunch Time Talk

   12:30 pm, Bldg. 510 / Room 2-160

   Hosted by: Tomomi Ishikawa

   An approach to the formulation of chiral gauge theories on the lattice is to start with a vector- like theory, but decouple one chirality (the "mirror" fermions) using strong Yukawa interactions with a chirally coupled "Higgs" field. While this is an attractive idea, its viability needs to be tested with nonperturbative studies. The model that we studied here, the so- called "3-4-5" model, is anomaly free and the presence of massless states in the mirror sector is not required by anomaly matching arguments, in contrast to the "1-0" model that was studied previously. I will talk about the results we got from the study of the "3-4-5" model, which does not suggest the decoupling of the mirror fermions and therefore no emergence of the chiral gauge theory.

1. Brookhaven Forum 2013

   9 am, Berkner Hall Auditorium

   Hosted by: Amarjit Soni

   There will be plenary talks all 3 mornings and parallel sessions on Wed and Thurs. The meeting covers a very broad area of Particle Physics as well as Astroparticle Physics & cosmology. For further details please visit our web site. We hope very much you will be able to join us. Thanks very much, Hooman and Soni

2. Nuclear Physics & RIKEN Theory Seminar

   2 pm, Small Seminar Room, Bldg. 510

   Hosted by: Vladimir Skokov

   I will talk about our recent attempt to formulate lattice QCD in rotating frames for the purpose of studying the physics of QCD matter under rotation. We construct the lattice QCD action with the rotational metric and apply it to a Monte Carlo simulation. As an application, we calculate the angular momentum densities of gluons and quarks in the rotating QCD vacuum.

3. BERA AAAG Scholarship Reception

   5 pm, Brookhaven Center

   Hosted by: BERA African American Affinity Group

   On Fri., May 3, 2013, 5:00-6:30 pm at the Brookhaven Center (South Room) the African American Affinity Group will present their first annual STEM Scholarship Reception to recognize the academic excellence of their '2013 Scholarship Recipients' Refreshments will be served. Please R.S.V.P. (with number of guests) to: Patrice Greenwood greenwood@bnl.gov

1. Office of Educational Programs Event

   8:30 am, Berkner Hall Auditorium

   Hosted by: Bernadette Uzzi

There are no events scheduled at this time.

1. National Synchrotron Light Source Seminar

   2 pm, Seminar Room, Bldg. 725

   Hosted by: Wah-Keat Lee

   Ph.D. work (The College of William and Mary, 08/2007-10/2011) �– Medical Image non-rigid registration �– A partial image non-rigid registration method to deal with tumor resection using pre-operative MRI and intra-operative MRI �– Moving propagation in myocardium (Siemens intern) �– A hybrid registration method to propagate the motion of the myocardium using Cine MRI �– Real-time physics-based registration �– A real-time registration method using GPU and Multicores. �– Multi-tissue mesh generation �– A mesh generation method for Finite Element Analysis Postdoc work (NIH, 10/2011-04/2013) �– Multimodal image driven cancer modeling �– Build a model to predict tumor growth based on dual phase CT and FDG-PET �– Myocardial fibrosis detection �– Develop a tool to detect myocardial fibrosis using low dose CT. This tool includes segmentation, registration, modeling and mesh editor �– Software: Medical Image Computing (MIC) �– Software demo

2. Particle Physics Seminar

   3 pm, Small Seminar Room, Bldg. 510

   Hosted by: David Jaffe

1. Hospitality Event

   10:30 am, Recreation Hall, Bldg. 317

   Hosted by: QOL/BERA/Recreation

   Coffee at 10:30am. Free knitting class at 2pm. Plenty of free supplies. Come socialize & lean this useful craft.

2. CFN Internal Research Seminar

   11 am, Bldg. 735 - Conf Rm B

   Block copolymer self assembly is a particularly convenient method for fabricating nanostructured materials and devices, having the ability to spontaneously form regular patterns over arbitrarily large areas with feature sizes in the range of 10 nanometers. Because block copolymers can be processed in a manner similar to polymer photoresists, they are used by our group and many groups throughout the world to build nanostructures by combining with more conventional top-down fabrication approaches. Several CFN staff members have significant experience and knowledge of block copolymers, and we should consider use of these materials as a strategic scientific strength of our center. I will describe some of our current projects using block copolymers to fabricate nanostructures for solar devices, as well as new directions we will pursue in the near future. A goal of my presentation will be finding other ongoing or planned CFN research that can benefit from the types of structures we can fabricate by this approach.

3. EAP Lunchtime Talk

   12 pm, Berkner Hall, Room B

   Topics to be covered: -Define emotional resilience -Identify the ways emotional resilience benefits health, relationships and success at work -Explore techniques and practices that strengthen emotional resilience -Identify resources Seating is limited, so registration is required.

4. Asian Pacific American Heritage Month

   12 pm, Berkner Hall Auditorium

   Hosted by: Asian Pacific American Association

   An assortment of vibrant cultural dances from China, Nepal, and India in celebration of diversity and Asian Pacific American Heritage Month.

5. Physics Colloquium

   3:30 pm, Large Seminar Room, Bldg. 510

   Hosted by: Peter Petreczky

   The Alpha Magnetic Spectrometer is a TeV multipurpose particle physics detector installed on the International Space Station in May of 2011. The first 18 months result on positron fraction will be presented.

1. Workshop on Radiation Safety

   8:30 am, Berkner Hall, Room B

   Hosted by: Panakkal Job

2. Play Group Event

   10 am, Recreation Hall, Bldg. 317

   Hosted by: QOL/BERA/Recreation

   To join, go to: meetup.com/BNL-playgroup

3. National Synchrotron Light Source Seminar

   10 am, Seminar Room, Bldg. 725

   Hosted by: Evgeny Nazaretski

   The discovery of graphene, a unique two- dimensional electron system with extraordinary physical properties, has ignited tremendous research activity in both science and technology. Graphene can be obtained from graphite by moving its top layer until it becomes locally decoupled from the bulk. However, a detailed microscopic understanding of this process has yet to be completed. Here a series of measurements on HOPG surface using a technique called electrostatic-manipulation scanning tunneling microscopy (EM-STM) are presented. These measurements successfully reduce the interplanar coupling strength between top plane of graphite and the bulk resulting in transition from graphite to graphene. In addition, STM images which reveal several intermediate stages in between pure graphene and pure graphite are also presented. Density functional theory was used to simulate STM images from a six-layer slab of graphite. A continuous transition from pure graphite to pure graphene was observed with the simulations.

4. ASAP Cross Talk Presentations

   12 pm, Berkner Hall, Room D

   Hosted by: BNL Association of Students and Postdocs (ASAP)

   Imaging Anti-Ferromagnetic A-type domains in strongly correlated LaSr2Mn2O7 Mirian García-Fernández Supervisor: Stuart B. Wilkins Abstract: Strongly correlated electron systems display a wide range of potentially useful properties. In these systems the correlation of electrons results in very rich phase diagrams with different and interesting ground states. As a consequence of the competition between different phases, very interesting properties like superconductivity and colossal magnetoresistance can occur. This competition between phases leads to electronic domains and inhomogeneities over a range of real-space length scales, from nanometers to hundreds of microns. Understanding the role that these domains play in defining the properties of strongly correlated electron systems appears as a mandatory requirement in order to achieve a full understanding of these systems. Among one of the most challenging properties to be studied in these materials antiferromagnetic order, one of the most ubiquitous ground states. The absence of any net magnetic moment from antiferromagnetic domains prohibits the use of most magnetic imaging techniques. Here we present results from a new imaging technique, soft x-ray resonant nano-diffraction. Reciprocal-space resolved soft x-ray diffraction, sensitive to long range electronic ordering, with a nano sized x-ray probe, focused by a Fresnel zone plate is used to study A-type antiferromagnetic (AFM) domains in La0.96Sr2.04Mn2O7. The existence of two different A-type AFM regions in the sample is demonstrated. These regions have the same magnetic Q-vector, but differing orientations of the ordered moment, at 90 degrees to one another. The two regions have an unequal population, and when studied in retail, they are found not to be symmetry related. Further, we found that one of the regions exhibits a type of fine structure that is absent in the other region. A possible explanation f

5. Shopping Shuttle & Transportation

   5:15 pm, Shopping Shuttle Continuous loop in Apartment area

   Wednesday Evening & Saturday Morning Weekly Shopping Shuttles from the Apartment Area and at the Cavendish & Curie Dorms to the South Port Shopping Center in Shirley. Enjoy Stop & Shop for groceries, Kohl's Department Store, and more. Call Ext. 2535 for more information.

1. 7th International Workshop on Radiation Safety

   8:30 am, Berkner Hall, Room B

   Hosted by: Panakkal Job

2. Town Hall Meeting

   9 am, Hamilton Seminar Room, Bldg. 555

   Hosted by: Gerald M. Stokes

3. National Synchrotron Light Source Seminar

   10 am, Seminar Room, Bldg. 725

   Hosted by: Evgeny Nazaretski

   The discovery of graphene, a unique two- dimensional electron system with extraordinary physical properties, has ignited tremendous research activity in both science and technology. Graphene can be obtained from graphite by moving its top layer until it becomes locally decoupled from the bulk. However, a detailed microscopic understanding of this process has yet to be completed. Here a series of measurements on HOPG surface using a technique called electrostatic-manipulation scanning tunneling microscopy (EM-STM) are presented. These measurements successfully reduce the interplanar coupling strength between top plane of graphite and the bulk resulting in transition from graphite to graphene. In addition, STM images which reveal several intermediate stages in between pure graphene and pure graphite are also presented. Density functional theory was used to simulate STM images from a six-layer slab of graphite. A continuous transition from pure graphite to pure graphene was observed with the simulations.

4. Adopt-a-Platoon Spring Plant Sale

   11:30 am, Outside of Berkner Hall

   Adopt-a-Platoon Spring Plant Sale 11:30-1:00 New Guinea Impatiens Hanging Baskets

5. Photon Sciences

   1:30 pm, Large Conference Room, Bldg. 703

   Hosted by: Mourad Idir

   This talk will provide a background on Aperture Optical Sciences Inc. Topics to be addressed will be: Robotic Polishing Aspheric Polishing and testing of SiC optics Specifying Optics for low Mid-spatial content http://www.apertureos.com/

6. Community Advisory Council Meeting

   6:30 pm, Brookhaven Center

1. 7th International Workshop on Radiation Safety

   8:30 am, Berkner Hall, Room B

   Hosted by: Panakkal Job

2. AdoptaPlatoon Fundraising Event

   11:30 am, Outside of Berkner Hall

   Adopt-a-Platoon Spring Plant Sale 11:30-1:00 New Guinea Impatiens Hanging Baskets

3. National Synchrotron Light Source Lunch Time Seminar

   12 pm, Seminar Room, Bldg. 725

   Hosted by: Dario Arena and Klaus Attenkofer

4. HET/BNL Lunch Time Talk

   12 pm, Physics, Bldg. 510, Room 2-160

5. Nuclear Physics & RIKEN Theory Seminar

   2 pm, Small Seminar Room, Bldg. 510

   Hosted by: Vladimir Skokov

   I discuss how global QCD fits of parton distribution functions can make the somewhat separated fields of high-energy particle physics and lower energy hadronic and nuclear physics interact to the benefit of both. In particular, I will argue that large rapidity gauge boson production at the Tevatron, RHIC and the LHC has the highest short-term potential to constrain the theoretical nuclear corrections to DIS data on deuteron targets necessary for up/down flavor separation. This in turn can considerably reduce the PDF uncertainty on cross section calculations of heavy mass particles such as $W'$ and $Z'$ bosons.

6. BrookhavenSphere Seminar

   2:30 pm, Bldg. 515 Seminar Room, ITD

   Hosted by: Information Technology Division

   Dr. Victor Skormin is a Distinguished Service Professor at Binghamton University involved in the cyber security research under the Air Force funding. At Binghamton University he organized two research laboratories specializing in laser communication and computer network security, and established and served as the Director of a Center for Advanced Information Technologies. Since 2001 he is an organizer and co-chair of the bi-annual International Workshop "Mathematical Methods, Models and Architectures for Computer Networks Security" in St. Petersburg, Russia funded by US Air Force and Navy. Dr. Skormin is a Senior Member of the IEEE and has served as an IEEE AES Transaction Editor. He authored/edited several books and many journal publications. He has served as a consultant on a number of industrial and Air Force projects.

There are no events scheduled at this time.

There are no events scheduled at this time.

1. Center for Functional Nanomaterials Seminar

   11 am, Bldg. 735 - Conf Rm B

   Hosted by: Eric Stach

   Bimetallic nanoparticles are promising candidates for electro- and heterogeneous catalysis because their catalytic activity is frequently superior to their monometallic counterparts. However, the additional degree of freedom introduces a new complexity into the mechanism because the distribution of the two metals may vary during reaction. For example, preferential adsorption of reactive molecules can induce segregation of one component, structural changes, and element-specific phase transformations. Uncovering the chemistry, structure, and degradation pathways of materials under catalytic conditions is of fundamental importance for establishing structure-property relationships and for the design of new catalytic materials. Aberration-corrected scanning transmission electron microscopy (STEM), in combination with electron energy loss spectroscopy (EELS), is exquisitely poised for studying structural, compositional, and electronic properties of nanocatalysts. The enlarged numerical aperture coupled with the use of a cold-field-emission gun allows for the acquisition of 2-D compositional and bonding maps of both bulk and nanostructured materials at atomic resolution. Additionally, the development and inclusion of differentially-pumped gas cells inside a transmission electron microscope (TEM) permits the visualization of solid-gas chemical reactions in situ. Imaging atomic-scale reaction dynamics and the acquisition of spectroscopic fingerprints allows us to reveal reaction pathways that cannot be resolved by any other approach. Here, I will provide background on our techniques, including STEM, EELS, electron tomography, and in situ environmental methods, and I will show how the surface and internal structures of Pt-transition metal bimetallic nanocatalysts reconstruct in response to annealing, acid leaching, operational aging, gas oxidation, and reduction. I will also discuss the current challenges and future prospects for quantitative environmental TEM.

2. NSLS-II Seminar

   2:30 pm, Bldg 703, large conference room

   Hosted by: Bob Sweet

   Macromolecular crystallisation is often a long and iterative process where initial promising conditions are optimised until crystals suitable for the diffraction experiments are obtained. Crystallisation is in most cases separated from the diffraction experiment, and crystals are more often than not optimised on the basis of their appearance, due to the difficulty in cryocooling and shipping every potential sample to the synchrotron. The objective for a new in situ beamline is to include and develop in situ analysis (diffraction with the crystal still in the crystallization chamber) seamlessly within existing crystallisation pipelines and provide an entirely automated facility for the characterisation of crystallization experiments, and data collection directly from crystals, in situ. High photon flux will enable fast data collection and the possibility to outrun radiation damage. Higher flux can be achieved by using multilayer optics which would deliver a broader bandpass beam. Such a beam would in addition simplify the screening mode as still images would contain relatively more diffraction spots, reducing the need for oscillation images. Beamlines with beams of between 5 and 20 mmicrons in size, and photon fluxes exceeding, 10^12 ph/s, are now available at most 3rd generation synchrotron sources. Their impact has been profound since they have enabled high quality data to be measured from small, poorly ordered, inhomogeneous and weakly diffracting crystals of membrane proteins, large macromolecular complexes and viruses. It has been demonstrated that datasets can be measured and compiled from crystals as small as 1.3 microns in non-optimal conditions using a 5 x 5 micron beam at Diamond beamline I24. Combined with the demonstration that X-ray free electron lasers can yield diffraction data from crystals <500 nm in size there is great potential for the use of submicron beams at synchrotrons with

1. Hospitality Event

   10:30 am, Recreation Hall, Bldg. 317

   Hosted by: QOL/BERA/Recreation

   Coffee at 10:30am. Free knitting class at 2pm. Plenty of free supplies. Come socialize & learn this useful craft.

2. Nuclear Physics Seminar

   11 am, Small Seminar Room, Bldg. 510

   Hosted by: Anne Sickles

   The observation of a long-range, near-side two-particle angular correlation in very high multiplicity proton-proton (pp) and proton-lead (pA) collisions at the LHC has changed our view of multiparticle production in these small systems. This phenomenon, known as the "Ridge", was first seen in high energy nucleus-nucleus (AA) collisions at RHIC, and is believed to be related to the collective evolution of a strongly interacting QCD matter created in AA. In this talk, I will first briefly review the history of ridge studies in AA and unexpected discovery of the ridge correlations in pp and pA systems. Focus will then be given to the most recent results of pA collisions at CMS from 2013 LHC run on two- and multi-particle correlations. I will discuss the new insights these results provide us toward disentangling different theoretical interpretations (i.e. CGC v.s. flow) to the physical origin of the ridge phenomenon in small systems of pp and pA.

1. Play Group Event

   10 am, Recreation Hall, Bldg. 317

   Hosted by: QOL/BERA/Recreation

   To join, go to: meetup.com/BNL-playgroup

2. Estate Planning II - Caring for Parents

   12 pm, Berkner Hall, Room B

3. Asian Pacific American Heritage Month Event

   12 pm, Berkner Hall, Room D

   Hosted by: Asian Pacific American Association

   Are you looking to enhance your speaking and leadership skills? Join in on a Toastmasters demo workshop lead by Beth Lin where you can learn to sharpen these skills in a no-pressure atmosphere

4. 'Get to Know the Lab' Series

   1 pm, Berkner Hall Auditorium

   Brookhaven Science Associates (BSA) Board Chair Ron Townsend will present this session in the ongoing "Get to Know the Lab" series. This is an opportunity for members of the Lab community to learn more about the BSA partnership between Battelle and Stony Brook University and its key role as the contractor-operator of Brookhaven Lab. There will also be plenty of time for questions.

5. Brookhaven Lecture

   4 pm, Berkner Hall Auditorium

   Hosted by: Allen Orville

6. Shopping Shuttles on Wed. & Sat. & Transportation info

   5 pm, Vairious pick up locations on a loop

   Wednesday Evening and Saturday morning weekly Shopping Shuttles from the Apartment area & the Cavendish & Curie Dorms to the South Port Shopping Center in Shirley. Enjoy Stop & Shop for groceries, Kohl's Dept. stora, and more. Call ext. 2535 for more information.

1. Health Promotion Program

   10 am, Occupational Medicine Clinic, Bldg 490

   Your current foot complaint or concern will be discussed along with all available treatment options.This free service is provided by Comprehensive Podiatry Associates, P.C. Please note that space is VERY limited. To schedule an appointment please contact: Michael Thorn via email at mthorn@bnl.gov or extension 8612.

2. Environmental Sciences Department Seminar

   11 am, Conference Room, Bldg 815E

   Hosted by: Stephen Schwartz

   In July 2011, NASA conducted the DISCOVER-AQ campaign over Maryland. Several aircraft and a ship were deployed with the goal of bridging the gap between space-based observations and surface concentrations. Along the way, substantial insight was gained into the chemistry, physics, and meteorology of smog events over the eastern US. This talk will summarize these findings and discuss broader uses of existing instruments such as OMI (SO2, NO2) and MOPITT (CO) and plans for the Geostationary Infrared Pollution Sounder, GRIPS, for trace gases and aerosols.

3. Center for Functional Nanomaterials Seminar

   11 am, Bldg. 735 - Conf Rm B

   Hosted by: Eric Stach

   Electron diffraction techniques are versatile method that can be employed to study many fundamental questions of crystal structure. In this presentation, I will introduce two important diffraction methods and their application in crystallography and material science. First topic is quantitative energy-filtered convergent beam electron diffraction (QCBED). It can be employed to measure the low order structure factor amplitudes and phases of microcrystals of known structure very accurately. Many difficulties of X-ray diffraction, such as extinction corrections, absorption corrections and scaling problems are avoided in electron diffraction. The accuracy is equivalent to that of the X-ray Pendullösung method, allowing the covalent and ionic contributions to be separately visualized. Accurate structure factors of Cu, GaN, AlN, SrTiO3, TiO2, Mg have been measured by QCBED. The measurement standard deviations are normally less than 0.2% for both amplitudes and phases of low order structure factors. Thus, accurate charge density maps have been obtained and the bonding character has been studied. Second topic is electron diffractive imaging. Diffractive imaging uses diffraction intensity and phase retrieval to form real-space images. Nanodiffraction patterns from carbon nanotubes and nanoparticles are recorded, and then a fienup algorithm is used to retrieve phases of these diffraction patterns to reconstruct atomic structure of these nanotubes and nano-particles. This lensless diffraction imaging method avoids the resolution limitation owning to objective lens aberration, and can enhance the resolution of TEM to sub-angstrom level using a conventional FEG gun TEM.

4. Particle Physics Seminar

   3 pm, Small Seminar Room, Bldg. 510

   Hosted by: Anze Slosar

   I will discuss an ongoing project to better understand quasars from the Sloan Digital Sky Survey (SDSS) by using cross correlations with BOSS galaxies that overlap in volume. We have the current best constraints showing quasar clustering does not appear to be dependent on the quasar luminosity, completely unlike what is seen with galaxies. I will also describe how we are using these measurements to further understand quasar properties, such as how they occupy dark matter halos and if their environment can provide clues on their formation and evolution.

1. Condensed-Matter Physics & Materials Science Seminar

   10:30 am, Bldg. 480 Conference Room

   Hosted by: Qiang Li

2. Biosciences Department Seminar

   11 am, Biosciences Seminar Room, Bldg. 463

   Hosted by: Benjamin Babst, Ph.D., Biosciences Dept.

   Effector proteins are exported to the interior of host cells by numerous plant pathogens. Effector proteins have been well characterized in bacteria. Contrastingly, the mechanisms through which these effectors promote virulence are largely unknown. Bioinformatic analysis of genome sequences from oomycete pathogens Phytophthora sojae, P. ramorum, P. infestans and Hyaloperonospora arabidopsidis (Hpa) have led to the identification of a large number of candidate effector genes. These effector genes have characteristic motifs (signal peptide, RxLR and dEER) that target the effectors into plant cells. Although these effector genes are very diverse, certain genes are conserved between P. sojae and H. arabidopsidis, suggesting that they play important roles in pathogenicity. The goal of my first project was to characterize a pair of conserved effector candidates from Hpa and P.sojae. We hypothesized that these effectors have important conserved roles with regard to infection. We found that the Hpa effector was expressed early during the course of infection of Arabidopsis and triggered an ecotype-specific defense response in Arabidopsis, suggesting that it was recognized by host surveillance proteins. Both the effectors from Hpa and P. sojae respectively could suppress immunity triggered by pathogen associated molecular patterns (PTI) and by effectors (ETI) in planta. They also enhanced bacterial virulence in Arabidopsis when delivered by the Type III secretion system. Similar results were seen with experiments with transgenic Arabidopsis expressing the effectors.

3. HET/BNL Lunch Time Talk

   12 pm, Phyiscs, Bldg. 510, Room 2-160

   Hosted by: Amarjit Soni

4. National Synchrotron Light Source Lunch Time Seminar

   12 pm, Seminar Room, Bldg. 725

   Hosted by: Dario Arena and Klaus Attenkofer

5. Nuclear Physics & RIKEN Theory Seminar

   2 pm, Small Seminar Room, Bldg. 510

   Hosted by: Vladimir Skokov

   Born in core-collapse supernovae, neutron stars contain matter at densities far beyond the ground state density of atomic nuclei. Measurements of neutron star properties, such as their masses and radii offer intriguing possibilities to probe the properties of dense nuclear matter like its compressibility and the nuclear symmetry energy. The composition of matter under neutron star conditions is currently unknown, but theoretical predictions range from pure nucleonic matter to the presence of hyperons or deconfined quarks. Since the appearance of hyperons or quark matter is often associated with a softening of the nuclear equations of state (and thereby low neutron star masses), the recent finding of a pulsars with masses of around two solar masses reignited the debate of whether hyperons or quarks can exist in neutron star interiors. However, various studies suggest that both quarks and hyperons can have stiff equations of state and therefore populate the interior of high mass stars. As a consequence, the question about the composition of high density neutron star matter remains undetermined. It is a continuing challenge for astrophysical and nuclear theory, experiment, and observations to determine clear constraints and signatures that would be able to confirm or exclude different neutron star compositions. With this in mind, I will discuss possible impacts of quark matter in neutron star interiors and core-collapse supernovae.

6. Office of Educational Programs Event

   4 pm, Office of Educational Programs (Bldg. 438)

   Hosted by: Scott Bronson

There are no events scheduled at this time.

There are no events scheduled at this time.