The Corona KH-4 reconnaissance satellite missions acquired panoramic stereo imagery with high spatial resolution of 1.8-7.5 m from 1962 to 1972. The potential of 800000+ declassified Corona images ...has not been leveraged due to the complexities arising from handling of panoramic imaging geometry, film distortions, and limited availability of the metadata required for georeferencing of the Corona imagery. This article presents the Corona Stereo Pipeline (CoSP): A pipeline for processing of Corona KH-4 stereo panoramic imagery. CoSP utilizes the deep learning-based feature matcher SuperGlue to automatically match feature points between Corona KH-4 images and recent satellite imagery to generate ground control points (GCPs). To model the imaging geometry and the scanning motion of the panoramic KH-4 cameras, a rigorous camera model consisting of modified collinearity equations with time-dependent exterior orientation parameters is employed. Using the entire frame of the Corona image, bundle adjustment with well-distributed GCPs results in an average standard deviation (SD) or <inline-formula> <tex-math notation="LaTeX">\sigma _{0} </tex-math></inline-formula> of less than two pixels. We evaluate fiducial marks on the Corona films and show that pre-processing the Corona images to compensate for film bending improves the 3-D reconstruction accuracy. The distortion pattern of image residuals of GCPs and <inline-formula> <tex-math notation="LaTeX">y </tex-math></inline-formula>-parallax in epipolar resampled images suggest that film distortions due to long-term storage likely cause systematic deviations of up to six pixels. Compared to the Shuttle Radar Topography Mission (SRTM) digital elevation model (DEM), the Corona DEM computed using CoSP achieved a normalized median absolute deviation (NMAD) of elevation differences of <inline-formula> <tex-math notation="LaTeX">\approx </tex-math></inline-formula>4 m over an area of approximately 4000 km2 after a tile-based fine coregistration of the DEMs. We further assess CoSP on complex scenes involving high relief and glacierized terrain and show that the resulting DEMs can be used to compute long-term glacier elevation changes over large areas.
This article examines Rokeya Sakhawat Hossain's speculative science fiction story "Sultana's Dream" in the context of science fiction writing in 19th- and 20th-century Bengal. It analyses the story's ...intersection with a range of discourses and the way this creates a distinctive text. The story is discussed in terms of the key discursive formations that Hossain contends with: that of the "women's question" (with an emphasis on the Muslim woman's question); the nature of the violence that produces a male-dominated state; and the possibility of a scientific-aesthetic intervention capable of countering such male violence. The article argues that Hossain's speculative science fiction, by portraying the liberatory potential of a transformed scientific state apparatus, produces a model of a feminist Utopia which is not grounded simply in gender, but also in the possibility of a state based on a rational aesthetic.
Lipids extracted from foods fried in thermally polymerized palm oil were evaluated in papads, French fries and fish fry (Bombay duck) with moisture content ranging between 10% and 75%, in an attempt ...to investigate the effect of moisture content on lipid quality indices such as free fatty acids, conjugated dienes, p-anisidine value, viscosity, total polar materials and colour values. The quality of lipids in products with high moisture content (50% or more) was found to be inferior to that of the oil left after frying, as evidenced in Bombay duck and French fries from potatoes with initial moisture content of 52–77%. A reverse trend was observed in papads and French fries prepared from dehydrated potatoes with moisture content of 12% or less. The results indicate the moisture content of food plays a definite role in the distribution of the lipid constituents during frying in thermally polymerized oil.
We have explored the nonadiabatic chemical dynamics of trans-azomethane (AM) and azoxymethane (AOM) using ab initio multiple spawning (AIMS) simulation and CASSCF theory. A trans-to-cis isomerization ...around the N = N bond and a pyramidalization of the N(O)N moiety are predicted to be involved in the internal conversion process of AM and AOM molecules, respectively. AIMS-based simulation at the CASSCF(6,4)/6-31G(d) level of theory reveals that electronically excited AM and AOM molecules undergo extremely fast (approximately in 125 fs for AM and 64 fs for AOM) relaxation to the ground state via the (S1/S0)CI conical intersection. In addition, AIMS simulation at the CASSCF(10,8)/6-31G(d) level of theory reveals that AM molecules exhibit two relaxation pathways: major (comprising 75%) channel involves an isomerization process and minor (comprising 25%) channel features the C-N bond dissociation.
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Conventional thermal activation-based methods (such as temperature programmed desorption measurements) can monitor recombinative Oadsorbed + Oadsorbed = O2,gas desorption only from ...the (√5X√5)R27O-O and p(2x2)-O phases on the single crystal Pd(100) surface. Both the c(2X2)-O and p(5X5)-O phases remain silent in this overall thermally activated recombinative desorption process. With the help of femtosecond laser excitation, for the first time, we demonstrate that both c(2X2)-O and p(5X5)-O phases can be made active for the recombinative Oadsorbed + Oadsorbed = O2,gas desorption. Thus, femtosecond laser excitation opens door to the investigation of the surface chemical reactions which otherwise cannot be probed with the help of conventional thermal heating process. Finally, ultrafast dynamics of the recombinative Oadsorbed + Oadsorbed = O2,gas desorption from the c(2X2)-O and p(5X5)-O phases is presented.
Reference data for European Organization for Research and Treatment of Cancer (EORTC) quality of life questionnaires do not include studies from the Indian subcontinent. The objective of the current ...study was to establish a reference dataset for Indian patients of non-small cell lung cancer (NSCLC) presenting with brain metastases (BM).
One hundred forty patients with NSCLC with BM treated between 2012-2015 were registered in a prospective cohort study (CTRI/2013/01/003299). The baseline quality of life was evaluated using the EORTC general quality of life questionnaire QLQ-C30 and lung cancer specific module LC13. Minimum important difference (MID) scores for individual domains of the EORTC QLQ-C30 and LC13 questionnaires were derived (MID = 0.2 x standard deviation) from the reference data for patients with recurrent/metastatic lung cancers. In addition, a systematic review was conducted to identify studies reporting baseline quality of life scores for recurrent/metastatic NSCLC.
Scores of several functional as well as symptom scales in the current NSCLC population differed by more than the MID from the baseline mean scores in the reference EORTC population as well as that reported from other studies. Differences in mean score from the EORTC reference data ranged from 6.2 and 9.4 points for the role functioning and cognitive functioning domains. In the symptom scales, the largest differences were observed for the financial difficulties (23.9) scores for the QLQ-C30 and peripheral neuropathy (21.7) for LC13 questionnaires.
The current study demonstrates that baseline reference scores need to be established for patients from the Indian subcontinent. The findings from the current study have important implications for studies employing quality of life (QOL) assessment in the Indian NSCLC patient population.
To gain insight into the ultrafast electronically nonadiabatic chemistry of azido-based energetic plasticizer, we have explored the nonadiabatic chemical dynamics of an azido-based model analog ...molecule, methyl azide (MAz), using ab initio multiple spawning (AIMS) simulation and electronic structure theory calculations. Molecular nitrogen (N2) is predicted to be the initial product of MAz following its electronic excitation to the S1 electronically excited state. AIMS-based simulation reveals that electronically excited azido-based molecules undergo extremely fast (approximately in 40 femtoseconds) relaxation to the ground state via the (S1/S0)CI conical intersection. Furthermore, this relaxation process involves the NN bond elongation along with the bending of N3 moiety. This is the first report on the electronically non-adiabatic chemical dynamics (in ultrafast time domain) of methyl azide. Finally, using ultraviolet–visible (UV–VIS) spectroscopy, we comment on the electronically nonadiabatic chemistry of azido-based energetic plasticizer, bis(1,3-diazido prop-2-yl)malonate.
In the present work, for the first time, ultrafast dynamics of recombinative desorption of molecular oxygen (Oadsorbed + Oadsorbed = O2,gas) from the Pd(110) single crystal surface has been explored ...using the femtosecond two-pulse correlation spectroscopy. The time scale of this reaction is found to be ~1 picosecond. Theoretical simulation predicts important role of the hot electrons in this surface chemical reaction.
The attochemistry of chemical bonding Bag, Sampad; Chandra, Sankhabrata; Ghosh, Jayanta ...
International reviews in physical chemistry,
07/2021, Letnik:
40, Številka:
3
Journal Article
Recenzirano
Traditionally, over the last century, approaches used to elucidate the 'static' and the 'dynamic' nature of chemical bonding have been fundamentally different. The 'static' nature of chemical bonding ...has been explored using either valence bond or molecular orbital theory with the time-independent atomic or molecular orbitals. The 'dynamic' nature of chemical bonding, on the other hand, has been explored under the name 'chemical dynamics' through the notion of a transition state (rearrangement of nuclei). Understanding of the 'dynamic' nature of chemical bonding could, however, be developed through a time-dependent change of atomic and molecular orbitals (or broadly the time-dependent electron density). In the present review article, we have presented our state-of-the-art understanding of attosecond dynamics of chemical bonding from a general chemical point of view. We have demonstrated our viewpoints on dynamics of covalent and noncovalent bonds using both time-dependent natural bond orbital and canonical molecular orbitals. Finally, we have demonstrated the efficacy of high harmonic generation spectroscopic investigation to decipher attosecond charge migration through noncovalent bonds. Several chemically important systems, in which attosecond dynamics can play an important role, are discussed.
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