1,358,359 research outputs found
Marjan Naderi Slam Poetry Lesson
No full textMarjan Naderi, the 2020 D.C. Youth Poet Laureate, is an Afghan-American writer and educator based in Washington, D.C. As a 6-time Poetry Grand Slam Champion, Naderi has been featured on NowThis News, The Washington Post, NPR, The United Nation’s Girl Up Campaign, NBC News, Amazon Prime, The Kennedy Center, D.C. United, Nike, The U.S. Institute of Peace, and more. Her writing has been recognized by The Adroit Journal, Brave New Voices, The Split This Rock Database, and The National YoungArts Foundation where she was nominated for the 2020 U.S. Presidential Scholar in the Arts Award
Marjan Naderi Performance of Her Work
No full textMarjan Naderi, the 2020 D.C. Youth Poet Laureate, is an Afghan-American writer and educator based in Washington, D.C. As a 6-time Poetry Grand Slam Champion, Naderi has been featured on NowThis News, The Washington Post, NPR, The United Nation’s Girl Up Campaign, NBC News, Amazon Prime, The Kennedy Center, D.C. United, Nike, The U.S. Institute of Peace, and more. Her writing has been recognized by The Adroit Journal, Brave New Voices, The Split This Rock Database, and The National YoungArts Foundation where she was nominated for the 2020 U.S. Presidential Scholar in the Arts Award
To Mars and beyond; interview with Dr. Firouz Naderi, the director solar system exploration at NASA JPL
No full textNASA’s Jet Propulsion Laboratory (JPL) is the leader of the planetary missions. Located in Pasadena, California, this laboratory is responsible for the operation of NASA’s planetary spacecraft and its deep space network. The Leonardo Times was able to have an interview with Dr. Firouz Naderi, who is the director of the solar system exploration program at JPL, to talk about the new exciting missions NASA has planned for futureAerospace Engineerin
Homodyne coherent quantum noise cancellation in a hybrid optomechanical force sensor
No full textIn this paper, we propose an experimentally viable scheme to enhance the
sensitivity of force detection in a hybrid optomechanical setup assisted by
squeezed vacuum injection, beyond the standard quantum limit (SQL). The scheme
is based on a combination of the coherent quantum noise cancellation (CQNC)
strategy with a variational homodyne detection of the cavity output spectrum in
which the phase of the local oscillator is optimized. In CQNC, realizing a
negative-mass oscillator in the system leads to exact cancellation of the
backaction noise from the mechanics due to destructive quantum interference.
Squeezed vacuum injection enhances this cancellation and allows sub-SQL
sensitivity to be reached in a wide frequency band and at much lower input
laser powers. We show here that the adoption of variational homodyne readout
enables us to enhance this noise cancellation up to compared
to the standard case of detection of the optical output phase quadrature,
leading to a remarkable force sensitivity of the order of , around 2-order enhancement compared to the
standard case. Moreover, we show that at nonzero cavity detuning, the signal
response can be amplified at a level three to five times larger than that in
the standard case without variational homodyne readout, improving the
signal-to-noise-ratio (SNR). Finally, the variational readout CQNC developed in
this paper may be applied to other optomechanical-like platforms such as
levitated systems and multimode optomechanical arrays or crystals as well as
Josephson-based optomechanical systems.Comment: 18 pages; 18 figure
Corrigendum to “Sulfoethylated nanofibrillated cellulose: Production and properties” [Carbohydr. Polym. 169 (2017) 515–523]
No full textThe author Ali Naderi regrets the wrong information given with regard to his affiliation. The author would like to apologise for any inconvenience caused.</p
Wide band Microwave Characterization of MWCNTs/Epoxy Composites
No full textMulti Walled Carbon Nanotubes (MWCNTs) have been used as polymer fillers for a number of years. Their use lead to a relevant improvement of the mechanical and electrical properties of the host polymer even at low filler contents.
In this paper we will present a wide band (3-18 GHz) study of the complex permittivity in Epoxy based composites containing different types of MWCNTs. This carbon filler with different dimensions have been considered in order to study the role of lengths and diameters on the electrical properties of the composit
Manhattan and Beyond. I film americani di Amir Naderi
No full textAnalisi della carriera americana del regista iraniano Amir Naderi, da Manhattan by Numbers (1993) a Vegas: Based on a True Story (2008
Caspian sea-level changes during the last millennium: Historical and geological evidence from the south Caspian Sea
No full textThis article is made available through the Brunel Open Access Publishing Fund. Copyright @ Author(s) 2013. This work is distributed
under the Creative Commons Attribution 3.0 License.Historical literature may constitute a valuable
source of information to reconstruct sea-level changes. Here,
historical documents and geological records have been combined
to reconstruct Caspian sea-level (CSL) changes during
the last millennium. In addition to a comprehensive literature
review, new data from two short sediment cores were
obtained from the south-eastern Caspian coast to identify
coastal change driven by water-level changes and to compare
the results with other geological and historical findings.
The overall results indicate a high-stand during the Little Ice
Age, up to −21m (and extra rises due to manmade river
avulsion), with a −28m low-stand during the Medieval Climate
Anomaly, while presently the CSL stands at −26.5 m.
A comparison of the CSL curve with other lake systems and
proxy records suggests that the main sea-level oscillations
are essentially paced by solar irradiance. Although the major
controller of the long-term CSL changes is driven by climatological
factors, the seismicity of the basin creates local
changes in base level. These local base-level changes should be considered in any CSL reconstruction
Factor XIII deficiency diagnosis: Challenges and tools
No full textFactor XIII deficiency (FXIIID) is a rare hereditary bleeding disorder arising from heterogeneous mutations, which can lead to life-threatening hemorrhage. The diagnosis of FXIIID is challenging due to normal standard coagulation assays requiring specific FXIII assays for diagnosis, which is especially difficult in developing countries. This report presents an overview of FXIIID diagnosis and laboratory methods and suggests an algorithm to improve diagnostic efficiency and prevent missed or delayed FXIIID diagnosis. Assays measuring FXIII activity: The currently available assays utilized to diagnose FXIIID, including an overview of their complexity, reliability, sensitivity, and specificity, as well as mutational analysis are reviewed. The use of a FXIII inhibitor assay is described. Diagnostic tools in FXIIID: Many laboratories are not equipped with quantitative FXIII activity assays, and if available, limitations in lower activity ranges are important to consider. Clot solubility tests are not standardized, have a low sensitivity, and are therefore not recommended as routine screening test; however, they are the first screening test in almost all coagulation laboratories in developing countries. To minimize the number of patients with undiagnosed FXIIID, test quality should be improved in less well-equipped laboratories. Common country-specific mutations may facilitate diagnosis through targeted genetic analysis in reference laboratories in suspected cases. However, genetic analysis may not be feasible in every country and may miss spontaneous mutations. Centralized FXIII activity measurements should also be considered. An algorithm for diagnosis of FXIIID including different approaches dependent upon laboratory capability is proposed
Numerical Simulation of Hydrodynamic Forces on Bridge Decks
No full textHighway bridges along the coast and small river bridges in mountainous regions can be submerged during storm surges or strong rainfall events, respectively. Loss of serviceability during these conditions can dramatically hamper the evacuation plan and the capacity for emergency transportation, thus it is essential to ensure the stability of bridges in extreme hydrological events. Correct estimates of the hydrodynamic forces on a bridge allows bridge designers to evaluate the robustness of the bridge in a more sophisticated approach rather than relying on a constant force magnitude obtained from a small range of physical tests. This study presents numerical simulations performed to quantify the hydrodynamic forces on a bridge deck with a rectangular cross section. The results of the numerical model are validated against the results of physical experiments. More than 700 simulations were performed to thoroughly investigate the effect of certain parameters on the flow field and forces on the deck. The parameters considered include: the water level, the Froude number, the blockage ratio, the proximity of the deck to the channel floor, the inclination of the deck, and the aspect ratio of the deck. The lift force is found to be downward unless the deck is significantly submerged i.e., inundation ratio (h*) is greater than 3.5, and the upstream velocity is relatively small, Frd<0.6. For h*<3.5 the development of flow patterns on the upper side of the deck is constrained by the presence of the free surface which causes an asymmetric pressure distribution in the vertical direction and ultimately results in a downward force. Increase in flow velocity results in a higher downward force and hence increase the bridge stability (provided that the submergence of the bridge is not too high, h*<4). When considering the trend of changes in lift and drag forces simultaneously, it can be said that the combination of small velocities and inundation ratios higher than 2 results in the most critical situation for the vertical stability of the bridge deck. An increase in the blockage ratio results in an increase in the drag coefficient. On the other hand, a decrease in the blockage ratio shifts the drag coefficient towards the value of 1.56, which corresponds to the drag coefficient of a rectangular cylinder in an unbounded flow. Considering the common flow conditions of practical interest for bridge designers, the upper boundary of the drag coefficient for the box deck was found to be 2.8. Incipient failure analysis is performed to establish a hydrodynamic situation that can cause the failure of the deck. Regardless of the proximity ratio and the Froude number, the bridge deck collapsed when the inundation ratio was higher than 1.3. This indicates that the deck is more susceptible to high water levels than to flood velocity or to the distance to the channel floor. Moreover, no bridge failure occurred for inundation ratios lower than 1.3, indicating that the deck must be deeply submerged to fail. By extracting the starting point of failure for a wide range of inundation ratios, proximity ratios, and Froude numbers, contour lines of the threshold of failure are drawn. These contour lines representing the starting point of failure provide the basis for more accurate estimates of the failure of the bridge due to flood loadings and can be considered to be included in the bridge design codes and guidelines. In fact, this proposed method is more reliable than the traditional method which assumes a constant value for drag and lift. The traditional methods are still present in some guidelines such as the AASHTO Load and Resistance Factor Design (LRFD) Bridge Design Specifications. Attaching wing-shaped structures on the sides of the deck was proposed as a countermeasure to avoid failure of the bridge decks. Although the projected area of the deck perpendicular to the direction of flow was kept constant, it was expected that CD, CL, and CM would change; since they are dependent on the geometry of the deck, and the flow pattern is altered significantly due to the presence of wings. Results of several simulations for six different shape of wings under different inundation ratio and Froude number indicated that a rational shape of the wings can significantly alter the flow pattern around the deck and postpone occurrence of failure during conditions of really high water levels (h*>2.5) and high flood velocity (Fr>0.65). The proposed countermeasure can be considered as a robust solution for the wide range of probable floods, because of the fact that firstly, occurrence of this extreme hydrological situation is rare, and secondly, the stability of the deck in that situation might not be the first priority, especially compared with the risk of flooding a large part of the upstream land.The Erasmus+: Erasmus Mundus MSc in Coastal and Marine Engineering and Management is an integrated programme including mobility organized by five European partner institutions, coordinated by Norwegian University of Science and Technology (NTNU).Coastal and Marine Engineering and Management (CoMEM
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