116,518 research outputs found
Improved measurement of the branching fraction of h c → γη′/η and search for h c → γπ 0
No full textAbstract The processes h c → γP (P = η′, η, π 0) are studied with a sample of (27.12 ± 0.14) × 108 ψ(3686) events collected by the BESIII detector at the BEPCII collider. The decay h c → γη is observed for the first time with the significance of 9.0 σ, and the branching fraction is determined to be (3.77 ± 0.55 ± 0.13 ± 0.26) × 10 −4, while B (h c → γη′) is measured to be (1.40 ± 0.11 ± 0.04 ± 0.10) × 10 −3, where the first uncertainties are statistical, the second systematic, and the third from the branching fraction of ψ(3686) → π 0 h c . The combination of these results allows for a precise determination of R h c = B h c → γη B h c → γ η ′ , which is calculated to be (27.0 ± 4.4 ± 1.0)%. The results are valuable for gaining a deeper understanding of η − η′ mixing, and its manifestation within quantum chromodynamics. No significant signal is found for the decay h c → γπ 0, and an upper limit is placed on its branching fraction of B (h c → γπ 0) < 5.0 × 10 −5, at the 90% confidence level
Letter from C. H. Gensler, Havasupai Agency to Carl Hayden
No full textLetter from C. H. Gensler expressing concern on behalf of the Havasupai Tribe regarding the proposed park boundaries
Citations of the author H C Rajpoot
No full textThe list of the articles, research papers, theses, and book chapters globally citing the author H. C. Rajpoot</p
Studies on aminocyclobutenone rearrangements and a new C-H activation annulation reaction leading to N-heterocycles
No full textThis thesis describes study of aminocyclobutenone rearrangements. Thermal and photo rearrangements of cyclobutenones have become established as useful methods for the synthesis of quinones, naphthoquinones and furanones, some of which show useful biological activity. Though widely used, little is known about the behaviour of aminocyclobutenones. Herein, thermolyses and photolyses of aminocyclobutenones under continuous flow were studied in depth. DFT calculations were employed to bring greater understanding to our experimental results and identify new avenues for study.In this work we also introduce a novel metal-free C-H activation and annulation reaction which could lead to N-heterocycles. Experimental work and DFT calculations were performed to understand the nature of this unusual reaction. We also delineated the regioselectivity and diastereoselectivity of this reaction.A new rearrangement of cyclobutenones leading to 2-oxobut-3-enamides at low temperature has also been introduced. This new rearrangement offers a short and efficient route to synthesise highly substituted furans
MAGEC_2024
No full textMAGEC (Magma And Gas Equilibrium Calculator)
Author: Chenguang Sun
Copyright, 2025
This Matlab program calculates the equilibrium distribution of C-H-O-S volatiles (H2, H2O, CO, CO2, CH4, H2S, SO2, S2, COS, O2) in gas-melt coupled systems.
Updates on April 27, 2025:
1. Added additional options for CO2 and H2O solubility models
2. Corrected CO solubility models
If you use this program for your publications, please cite the following references:
1. Sun, C. and Yao, L., 2024. Redox equilibria of iron in low-to high-silica melts: A simple model and its applications to CHOS degassing. Earth and Planetary Science Letters, 638, p.118742. [Note: This is the reference for MAGEC_2024 with new Fe- and S-redox models and flexible setting options.]
2. Sun, C. and Lee, C.T.A., 2022. Redox evolution of crystallizing magmas with CHOS volatiles and its implications for atmospheric oxygenation. Geochimica et Cosmochimica Acta, 338, pp.302-321. [Note: This is the reference for the first version of MAGEC.]
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How to run the program:
1. Input T/P/logfO2 (or Fe3+/FeT) and compositions in the input file (.xlsx).
Make sure you use different names for the input and output files.
The batch data could be polybaric/isobaric/adiabatic degassing.
2. Modify the "settings" in the input file.
3. Open [Run_MAGEC_2024_v2.m] in Matlab
4. Go to [Editor] Tab in Matlab and click [Run] button.
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Letter from Carl Hayden to C. H. Gensler
No full textLetter from Carl Hayden to C. H. Gensler informing him of the proposed Grand Canyon National Park bill
Letter from C. H. Gensler, Havasupai Agency to Carl Hayden
No full textLetter from C. H. Gensler to Carl Hayden asking for a meeting in regards to the Havasupai pasture land in light of the national park bill
COASTAL - A Distributed Hydrologic Simulation Model for Lower Coastal Plain Watershed in Georgia
No full textSearch for new hadronic decays of h c and observation of h c → p p ¯ η
No full textAbstract A search for the hadronic decays of the h c meson to the final states p p ¯ π + π − π 0, p p ¯ η , and p p ¯ π 0 via the process ψ(3686) → π 0 h c is performed using (4.48 ± 0.03) × 108 ψ(3686) events collected with the BESIII detector. The decay channel h c → p p ¯ η is observed for the first time with a significance greater than 5σ and a branching fraction of (6.41 ± 1.74 ± 0.53 ± 1.00) × 10 −4, where the uncertainties are statistical, systematic, and that from the branching fraction of ψ(3686) → π 0 h c . Strong evidence for the decay h c → p p ¯ π + π − π 0 is found with a significance of 4.9σ and a branching fraction of (3.84 ± 0.83 ± 0.69 ± 0.58) × 10 −3. The significances include systematic uncertainties. No clear signal of the decay h c → p p ¯ π 0 is found, and an upper limit of 6.59 × 10 −4 on its branching fraction is set at the 90% confidence level
Silver-Mediated Direct sp(3) C-H Bond Functionalization
No full textDirect sp(3) C-H bond functionalization is an efficient, straightforward, and powerful method to construct new C-X (X = C, N, F, S) bonds from nonfunctionalized aliphatic motif of organic molecules, which has been used in late-stage modification of complex molecules. In this chapter, the recent developments of silver-mediated direct sp(3) C-H functionalizations are reviewed, categorized by C-C bond formation (C-H insertion), C-N bond formation (intramolecular and intermolecular amination/amidation), C-F bond formation, and C-S bond formation.SCI(E)[email protected]
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