Selective observation of enantiomeric chiral phonons in α\alpha-quartz

We report anomalous circularly polarized Raman spectra of phonons in right- and left-handed quartzes. The phonon branches splitting from the E-mode at a finite wavenumber were found to be chiral with mutually opposite angular momenta. Our analysis reveals the Raman selection rules for chiral phonons. We also find that the conservation of angular momentum should be satisfied between two photons and one chiral phonon in the Raman process. Furthermore, we experimentally proved that the helicity of phonons with a certain frequency and wavevector should be opposite in the other enantiomer

LARCH: Large Language Model-based Automatic Readme Creation with Heuristics

Writing a readme is a crucial aspect of software development as it plays a vital role in managing and reusing program code. Though it is a pain point for many developers, automatically creating one remains a challenge even with the recent advancements in large language models (LLMs), because it requires generating an abstract description from thousands of lines of code. In this demo paper, we show that LLMs are capable of generating a coherent and factually correct readmes if we can identify a code fragment that is representative of the repository. Building upon this finding, we developed LARCH (LLM-based Automatic Readme Creation with Heuristics) which leverages representative code identification with heuristics and weak supervision. Through human and automated evaluations, we illustrate that LARCH can generate coherent and factually correct readmes in the majority of cases, outperforming a baseline that does not rely on representative code identification. We have made LARCH open-source and provided a cross-platform Visual Studio Code interface and command-line interface, accessible at https://github.com/hitachi-nlp/larch. A demo video showcasing LARCH's capabilities is available at https://youtu.be/ZUKkh5ED-O4.Comment: This is a pre-print of a paper accepted at CIKM'23 Demo. Refer to the DOI URL for the original publicatio

Biosynthesis of Pregnenolone from Cholesterol by Mitochondrial Enzymes of Bovine Adrenal Cortex

Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/66357/1/j.1432-1033.1978.tb20931.x.pd

Stereoselective acyclic synthesis via allylmetals: Threo vicinal diols from both - and -[gamma]-alkoxyallyltins and aldehydes

Both - and -[gamma]-alkoxyallyltins stereoselectively add to aldehydes in the presence of BF3[middle dot]OEt2 at -78[deg]C in CH2Cl2 to produce the threo (or syn) vicinal diol monoalkyl ether unit.Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/26896/1/0000462.pd

Axial selectivity of 1,2-nucleophilic additions to 2-(Alkylidene)cyclohexanones: Is it higher than that of 2-cyclohexenones?

2-(Alkylidene)cyclohexanones embedded in steroid systems underwent 1,2-addition of both small and sterically demanding nucleophiles to yield exclusively the axial adducts, supporting the suggestion that 2-(alkylidene)cyclohexanones appear to have intrinsically higher axial selectivity than 2-cyclohexenones.Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/30835/1/0000497.pd