On March 31, 2019, I walked around the National Mall in Washington D.C. and visited the cherry blossoms in the Tidal Basin. This was one day before the predicted peak bloom this year when 70% of the blossoms of the Yoshino cherry trees that surround the Tidal Basin are open. I also went inside the West Building of the National Gallery of Art, the Archives of American Art Lawrence A. Fleischman Gallery, and the National Portrait Gallery. Below are some pictures taken in Washington D.C. while visiting the cherry blossoms and museums mentioned above.

washington monument cherry blossoms dc e1554072981275 768x1024 - Washington D.C. and Cherry Blossoms 2019
washington monument cherry blossom e1554073043407 768x1024 - Washington D.C. and Cherry Blossoms 2019
cherry blossom washington monument e1554073125492 768x1024 - Washington D.C. and Cherry Blossoms 2019
cherry blossom jefferson memorial washington dc e1554073232450 768x1024 - Washington D.C. and Cherry Blossoms 2019
pink cherry blossoms washington dc festival e1554073321821 768x1024 - Washington D.C. and Cherry Blossoms 2019
cherry blossoms washington dc 1024x768 - Washington D.C. and Cherry Blossoms 2019
cherry blossoms thomas jefferson memorial 1024x768 - Washington D.C. and Cherry Blossoms 2019
cherry blossoms tidal basin waterfront 1024x768 - Washington D.C. and Cherry Blossoms 2019
cherry blossoms martin luther king memorial 1024x768 - Washington D.C. and Cherry Blossoms 2019
scenic landscape gallery of art 1024x683 - Washington D.C. and Cherry Blossoms 2019
ships galley of art 1024x768 - Washington D.C. and Cherry Blossoms 2019
west building gallery of art exhibit e1554073915725 768x1024 - Washington D.C. and Cherry Blossoms 2019
carriage archives american art 1024x723 - Washington D.C. and Cherry Blossoms 2019
san francisco west side ridge painting 1024x846 - Washington D.C. and Cherry Blossoms 2019
martin luther king junior portrait gallery e1554074157765 768x1024 - Washington D.C. and Cherry Blossoms 2019
george washington portrait gallery 1 907x1024 - Washington D.C. and Cherry Blossoms 2019
george washington president portrait 1 772x1024 - Washington D.C. and Cherry Blossoms 2019
thomas jefferson president portrait 3 1024x848 - Washington D.C. and Cherry Blossoms 2019
abraham lincoln president portrait 16 951x1024 - Washington D.C. and Cherry Blossoms 2019
theodore roosevelt president portrait 26 999x1024 - Washington D.C. and Cherry Blossoms 2019
warren harding president portrait 29 1024x1002 - Washington D.C. and Cherry Blossoms 2019
harry truman president portrait 33 1024x890 - Washington D.C. and Cherry Blossoms 2019
john f kennedy president portrait 35 604x1024 - Washington D.C. and Cherry Blossoms 2019
richard nixon president portrait 37 1024x514 - Washington D.C. and Cherry Blossoms 2019
jimmy carter president portrait 39 761x1024 - Washington D.C. and Cherry Blossoms 2019
george hw bush president portrait 41 988x1024 - Washington D.C. and Cherry Blossoms 2019
barack obama president portrait 44 573x1024 - Washington D.C. and Cherry Blossoms 2019
reflecting pool washington dc e1554073735634 768x1024 - Washington D.C. and Cherry Blossoms 2019
white house washington dc 2019 1024x768 - Washington D.C. and Cherry Blossoms 2019
rosslyn virginia lincoln memorial view 1024x768 - Washington D.C. and Cherry Blossoms 2019

The Archives of American Art Lawrence A. Fleischman Gallery and the National Portrait Gallery are part of the Smithsonian which permits still and video photography for noncommercial use only in its museums and exhibitions, unless otherwise posted, as indicated at https://www.si.edu/visit/security. The National Gallery of Art permits photography for personal use unless otherwise prohibited, as indicated at https://www.nga.gov/visit/visitor-policies.html. All images above from inside the National Gallery of Art, Archives of American Art Lawrence A. Fleischman Gallery, and the National Portrait Gallery are being used for noncommericial and personal purposes. Refer to the disclaimer http://www.toddmccollough.com/policy-disclaimer/ for additional policies of this site.

On March 24, 2019, I walked around the National Mall, the Smithsonian Institution Building (the Castle), and the U.S. Capital in Washington D.C. I also went inside the National Postal Museum and the East Building of the National Gallery of Art. Below are some pictures taken in Washington D.C. while outside and inside these two exhibits.

IMG 3363 1024x928 - Washington D. C. and Postal Museum and Gallery of Art March 2019
IMG 3364 1024x768 - Washington D. C. and Postal Museum and Gallery of Art March 2019
IMG 3367 1 1024x670 - Washington D. C. and Postal Museum and Gallery of Art March 2019
IMG 3368 1 1009x1024 - Washington D. C. and Postal Museum and Gallery of Art March 2019
IMG 3369 1012x1024 - Washington D. C. and Postal Museum and Gallery of Art March 2019
IMG 3371 1024x768 - Washington D. C. and Postal Museum and Gallery of Art March 2019
IMG 3372 1024x768 - Washington D. C. and Postal Museum and Gallery of Art March 2019
IMG 3373 e1553465354110 768x1024 - Washington D. C. and Postal Museum and Gallery of Art March 2019
IMG 3374 e1553465445476 768x1024 - Washington D. C. and Postal Museum and Gallery of Art March 2019
IMG 3376 e1553465612877 768x1024 - Washington D. C. and Postal Museum and Gallery of Art March 2019
IMG 3379 1024x800 - Washington D. C. and Postal Museum and Gallery of Art March 2019
IMG 3382 e1553465686977 768x1024 - Washington D. C. and Postal Museum and Gallery of Art March 2019

The National Postal Museum is part of the Smithsonian which permits still and video photography for noncommercial use only in its museums and exhibitions, unless otherwise posted, as indicated at https://www.si.edu/visit/security. The National Gallery of Art permits photography for personal use unless otherwise prohibited, as indicated at https://www.nga.gov/visit/visitor-policies.html. All images above from inside the National Postal Museum and the National Gallery of Art are being used for noncommericial and personal purposes. Refer to the disclaimer http://www.toddmccollough.com/policy-disclaimer/ for additional policies of this site.

On Washington’s Birthday also known as President’s Day, on February 18, 2019, I attended the George Washington Birthday Parade in Alexandria, VA, and the day before I visited the National Portrait Gallery, which is a part of the Smithsonian Institution, in Washington D.C. The George Washington Birthday Parade marches through Old Town Alexandria and is billed as the largest George Washington Birthday Parade in the U.S. While at the National Portrait Gallery I visited the Hall of Presidents which has portraits of nearly all American presidents. Below are some pictures I took while over Presidents’ Day weekend in February, 2019.

IMG 3347 e1550522849751 768x1024 - Presidents' Day (Washington's Birthday) in Washington D.C. and Alexandria, VA, 2019
IMG 3349 e1550522952143 768x1024 - Presidents' Day (Washington's Birthday) in Washington D.C. and Alexandria, VA, 2019
IMG 3350 1024x768 - Presidents' Day (Washington's Birthday) in Washington D.C. and Alexandria, VA, 2019
IMG 3354 e1550523215794 645x1024 - Presidents' Day (Washington's Birthday) in Washington D.C. and Alexandria, VA, 2019
IMG 3356 1024x768 - Presidents' Day (Washington's Birthday) in Washington D.C. and Alexandria, VA, 2019
IMG 3360 1024x768 - Presidents' Day (Washington's Birthday) in Washington D.C. and Alexandria, VA, 2019
IMG 3361 1024x768 - Presidents' Day (Washington's Birthday) in Washington D.C. and Alexandria, VA, 2019
IMG 20190218 132700658 1024x576 - Presidents' Day (Washington's Birthday) in Washington D.C. and Alexandria, VA, 2019
IMG 20190218 132953500 1024x576 - Presidents' Day (Washington's Birthday) in Washington D.C. and Alexandria, VA, 2019
IMG 20190218 133157399 1024x576 - Presidents' Day (Washington's Birthday) in Washington D.C. and Alexandria, VA, 2019
IMG 20190218 133340375 HDR 1024x576 - Presidents' Day (Washington's Birthday) in Washington D.C. and Alexandria, VA, 2019
IMG 20190218 134115949 HDR 576x1024 - Presidents' Day (Washington's Birthday) in Washington D.C. and Alexandria, VA, 2019
IMG 20190218 134629108 1024x576 - Presidents' Day (Washington's Birthday) in Washington D.C. and Alexandria, VA, 2019
IMG 20190218 134716768 576x1024 - Presidents' Day (Washington's Birthday) in Washington D.C. and Alexandria, VA, 2019
IMG 20190218 135022449 1024x576 - Presidents' Day (Washington's Birthday) in Washington D.C. and Alexandria, VA, 2019
IMG 20190218 135251708 HDR 576x1024 - Presidents' Day (Washington's Birthday) in Washington D.C. and Alexandria, VA, 2019
IMG 20190218 135401650 1024x576 - Presidents' Day (Washington's Birthday) in Washington D.C. and Alexandria, VA, 2019
IMG 20190218 135759641 1024x576 - Presidents' Day (Washington's Birthday) in Washington D.C. and Alexandria, VA, 2019
IMG 20190218 135849587 1024x576 - Presidents' Day (Washington's Birthday) in Washington D.C. and Alexandria, VA, 2019
IMG 20190218 140032741 1024x576 - Presidents' Day (Washington's Birthday) in Washington D.C. and Alexandria, VA, 2019
IMG 20190218 140243431 1024x576 - Presidents' Day (Washington's Birthday) in Washington D.C. and Alexandria, VA, 2019
IMG 20190218 140746170 1024x576 - Presidents' Day (Washington's Birthday) in Washington D.C. and Alexandria, VA, 2019
IMG 20190218 141102848 1024x576 - Presidents' Day (Washington's Birthday) in Washington D.C. and Alexandria, VA, 2019
IMG 20190218 141714450 1024x576 - Presidents' Day (Washington's Birthday) in Washington D.C. and Alexandria, VA, 2019

For the pictures taken from the National Portrait Gallery, the Smithsonian permits still and video photography for noncommercial use only in its museums and exhibitions, unless otherwise posted, as indicated at https://www.si.edu/visit/security. All images above from inside the museums of the Smithsonian Institution are being used for noncommericial purposes. Refer to the disclaimer http://www.toddmccollough.com/policy-disclaimer/for additional policies of this site.

I am pleased that a paper titled “A Phase Shift and Sum Method for UWB Radar Imaging in Dispersive Media” has been published in IEEE Transactions on Microwave Theory and Techniques, in 2019, that I am a co-author on through prior work with the Celadon Research Division of Ellumen Inc.

This paper discusses applying a novel algorithm called phase shift and sum (PSAS) algorithm to reconstruct images from data collected from a fully automatic frequency and time domain measurement system for microwave imaging using a pair of movable antennas. The system described in the paper incorporates features from the Microwave Imaging Device patent where a pair of movable antennas are independently controlled to rotate around a region of interest. This paper builds upon work previously presented in 2018, in IEEE Transactions on Microwave Theory and Techniques in the paper A Time-Domain Measurement System for UWB Microwave Imaging and in 2017, in Progress In Electromagnetic Research C in the paper A novel cavity backed monopole antenna with UWB unidirectional radiation.

waveform sine - A Phase Shift and Sum Method for UWB Radar Imaging in Dispersive Media
This image is from pixabay

The PSAS algorithm resolves the multispeed and multipath issue when UWB signals propagate in dispersive media. In the PSAS method, frequency components in the UWB scattered signal are individually processed for phase shift compensation and amplitude decay compensation. The phase shift frequency responses are integrated over the spectrum, and the results are converted to a pixel value at each focal point to form an image. Using time domain signals collected from a digital phosphor oscilloscope for experimental tests, PSAS is compared to two traditional time-shift radar-based microwave imaging algorithms: delay-multiply-and-sum (DMAS) and robust artifact resistant (RAR). In the experimental tests two different objects are placed in a plastic graduated cylinder filled with glycerin. Results demonstrate superiority of PSAS over traditional time-shift methods with the lowest possibility of missing a weak scatterer and the lowest possibility of distortion of an object. I encourage you to download and read the full “A Phase Shift and Sum Method for UWB Radar Imaging in Dispersive Media” paper from IEEE for all the details of the algorithm, experimental setup, and image reconstruction results.

I visited the National Christmas Tree outside of the White House and also the U. S. Capitol Christmas Tree in Washington, D. C. in 2018. I was able to see both of the Christmas Trees with their lighting turned on at night as I visited after the National Christmas Tree Lighting was held on November 28, 2018, and the U. S. Capitol Christmas Tree Lighting was held on December 6, 2018. Both the National Christmas Trees and the U. S. Capitol Christmas Tree have their own websites where you can find out more information. I also visited the National Christmas Tree shortly before dark to better see the National Christmas Tree Railroad and train display underneath. Below are some pictures I took of both of the Christmas Trees.

IMG 3332 1024x768 - Christmas Tree at the White House and U.S. Capitol in Washington, D.C. in 2018
IMG 3334 e1544407767503 768x1024 - Christmas Tree at the White House and U.S. Capitol in Washington, D.C. in 2018
IMG 3319 e1544407856255 768x1024 - Christmas Tree at the White House and U.S. Capitol in Washington, D.C. in 2018
IMG 3315 e1544407954122 768x1024 - Christmas Tree at the White House and U.S. Capitol in Washington, D.C. in 2018
IMG 3314 1024x768 - Christmas Tree at the White House and U.S. Capitol in Washington, D.C. in 2018
IMG 3343 e1544407540794 768x1024 - Christmas Tree at the White House and U.S. Capitol in Washington, D.C. in 2018
IMG 3338 e1544407616500 768x1024 - Christmas Tree at the White House and U.S. Capitol in Washington, D.C. in 2018