211,969 research outputs found
Stonewall Jackson Portrait by William D. Washington
No full textOil portrait of General Stonewall Jackson, which was painted by William D. Washington in 1868, based on the 1862 "Winchester photo" of Jackson. The original portrait is owned by the Virginia Military Institute.The original portrait is owned by the Virginia Military Institut
New beamwidth formulas for 1-D leaky-wave antennas: A review
No full textIn this work, we comprehensively review the recent developments made in the context of the beamwidth evaluation in finite-aperture one-dimensional (1-D) leaky-wave antennas (LWAs). Indeed, the beam properties of 1-D LWAs are commonly evaluated assuming an infinite aperture, and only very recently the effect of the aperture truncation has been accounted for. However, the effects of the aperture truncation on 1-D unidirectional LWAs are different from those on endfire 1-D LWAs, and even more different from those on 1-D bidirectional LWAs. Each case deserves its own analysis, and this paper provides general formulas for the evaluation of such effects
Vascular endothelial growth factor-D induces lymphangiogenesis and lymphatic metastasis in models of ductal pancreatic cancer
No full textThe presence of lymphatic metastases is a strong indicator for poor prognosis in patients with ductal pancreatic cancer. In order to better understand the mechanisms controlling lymphatic growth and lymph node metastasis in human ductal pancreatic cancer, we analyzed the expression pattern of the vascular endothelial growth factor-D (VEGF-D), its receptor VEGF-receptor-3 (VEGFR-3) and the lymphatic endothelium-specific hyaluronan receptor LYVE-1 in a panel of 19 primary human ductal pancreatic tumors and 10 normal pancreas specimens. We further addressed the biological function of VEGF-D for induction of lymphatic metastasis in a nude mouse xenograft model using two human ductal pancreatic cancer cell lines with overexpression of VEGF-D. Compared to normal human pancreas, pancreatic cancer tissue showed overexpression of VEGF-D and VEGFR-3 in conjunction with a high lymphatic vascularization as determined by immunohistochemistry and in situ hybridization. Tumors derived from VEGF-D-overexpressing cells had a higher microvessel density compared to their mock-controls, as determined based on CD31 immunohistochemistry. Importantly, these tumors also revealed a significant induction of intra- and peritumoral lymphatics, as judged from inmunohistochemical detection of LYVE-1 expression. This was associated with a significant increase in lymphatic vessel invasion by tumor cells and an increased rate of lymphatic metastases, as indicated by pan-cytokeratin reactive cells in lymph nodes. Our results suggest that VEGF-D plays a pivotal role in stimulating lyrnphangiogenesis and lymphatic metastasis in human ductal pancreatic cancer, and therefore represents a novel therapeutic target for this devastating disease
Vascular endothelial growth factor-D induces lymphangiogenesis and lymphatic metastasis in models of ductal pancreatic cancer
No full textThe presence of lymphatic metastases is a strong indicator for poor prognosis in patients with ductal pancreatic cancer. In order to better understand the mechanisms controlling lymphatic growth and lymph node metastasis in human ductal pancreatic cancer, we analyzed the expression pattern of the vascular endothelial growth factor-D (VEGF-D), its receptor VEGF-receptor-3 (VEGFR-3) and the lymphatic endothelium-specific hyaluronan receptor LYVE-1 in a panel of 19 primary human ductal pancreatic tumors and 10 normal pancreas specimens. We further addressed the biological function of VEGF-D for induction of lymphatic metastasis in a nude mouse xenograft model using two human ductal pancreatic cancer cell lines with overexpression of VEGF-D. Compared to normal human pancreas, pancreatic cancer tissue showed overexpression of VEGF-D and VEGFR-3 in conjunction with a high lymphatic vascularization as determined by immunohistochemistry and in situ hybridization. Tumors derived from VEGF-D-overexpressing cells had a higher microvessel density compared to their mock-controls, as determined based on CD31 immunohistochemistry. Importantly, these tumors also revealed a significant induction of intra- and peritumoral lymphatics, as judged from inmunohistochemical detection of LYVE-1 expression. This was associated with a significant increase in lymphatic vessel invasion by tumor cells and an increased rate of lymphatic metastases, as indicated by pan-cytokeratin reactive cells in lymph nodes. Our results suggest that VEGF-D plays a pivotal role in stimulating lyrnphangiogenesis and lymphatic metastasis in human ductal pancreatic cancer, and therefore represents a novel therapeutic target for this devastating disease
Accurate formulas for the beamwidth of 1-D bidirectional leaky-wave antennas
No full textIn this work, we accurately evaluate the beamwidth of one-dimensional (1-D) bidirectional leaky-wave antennas (LWAs) radiating at broadside. Indeed, existing formulas neglect the effect of the aperture truncation, which affects the exact value of the beamwidth for practical realizations of 1-D LWAs. By exploiting a well-established theoretical framework, we find an approximate, but still accurate analytical formula for evaluating the beamwidth of finite-length 1-D bidirectional LWAs radiating at broadside. The comparison with numerical results confirm the accuracy of the proposed formula, whereas the comparison with previous formulas confirm its relevance for accurate LWA design
Radiating properties of 1-D bidirectional leaky-wave antennas
No full textWe analyze radiation from bidirectional one-dimensional leaky-wave antennas (1-D LWAs), from an original perspective. As is known, when the aperture is infinite, the radiation pattern changes considerably for certain combinations of the phase and the attenuation constants. These specific values identify the boundaries between different radiating regimes. In this work, we thoroughly explain the evolution of the beam through all the radiating regimes, and then evaluate its beamwidth with original analytical formulas. The relevant case of a finite-size aperture is considered as well. In this case, we show that the boundaries between the radiating regimes change as the radiation efficiency changes. The evolution of these boundaries as a function of the radiation efficiency is found by numerical means. These results allows for a rigorous and comprehensive description of the radiating behavior of practical 1-D bidirectional LWAs
General formulas for the beam properties of 1-D bidirectional leaky-wave antennas
No full textIn this paper, we analyze the beam properties of bidirectional 1-D leaky-wave antennas (1-D LWAs). Specifically, it is found that, even in the infinite-aperture case, the beam properties considerably change for certain combinations of the phase and the attenuation constants, and different radiation regimes are identified here. New analytic formulas are provided to exactly evaluate the beamwidth of an infinite 1-D bidirectional LWA operating in any radiating regime. However, when the antenna truncation is accounted for, the boundaries between the radiating regimes change as the radiation efficiency changes. Analytic formulas are, therefore, provided to accurately calculate such boundaries for any practical radiation efficiency. The interesting case of a finite-length bidirectional 1-D LWA radiating at broadside is then extensively discussed. With respect to previous beamwidth formulas found in the literature, the new formulas take into account the finiteness of the aperture, thus providing more useful and reliable results, especially in cases when the aperture truncation considerably affects the radiation efficiency. The numerical results corroborate the accuracy of the proposed expressions. These new formulas not only significantly improve the accuracy of the existing ones but also lay the groundwork for the analysis of the beamwidth properties of the important case of 2-D LWAs
Letter from John D. Jackson to L. S. Joynes, 1864 September 5
No full textLetter from John D. Jackson to L. S. Joynes recommending John W. Templeton as a medical student.https://scholarscompass.vcu.edu/san/1088/thumbnail.jp
DTB 026 Antonio D Jackson 6-7-2022
No full textIn this interview, Bishop Antonio D. Jackson is interviewed by Jada Jones and Ryan Morini at Christ Temple Apostolic Church in Mobile, Alabama. Bishop Jackson describes growing up Down the Bay in the 1980s, the boundaries of the neighborhood as he knew them at that time, and some of his family history. He describes some of his favorite foods from his younger years, his experiences with church, and his early interest in drumming. He also talks about his experiences with hurricanes Down the Bay. Bishop Jackson concludes the interview by talking about his path to becoming pastor of Christ Temple, and his experiences touring with a gospel band before that
Jackson D. Currie Korean War collection [DIGITAL CONTENT]
No full textThis collection contains an oral history interview with Jack Currie from July 23, 2009, as well as documents relating to his military service
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