NOTES ON MELITÆA ALMA STRECKER.

ALMA Memo 563 Suggestions for SMA Connector Use on ALMA

With over 600 receiver cartridges, ALMA will have several thousand SMA connectors, many of which will be subjected to periodic cryogenic cooling. At present, ALMA has no specifications on the proper torquing of SMA connectors nor on whether any type of staking should be used. This note summarizes the experience of a number of engineers involved with receiver construction for radio astronomy and...

Asymmetric strecker reactions.

ALMA Chapter 3.1: Calibration issues for ALMA

The precision imaging to be attained by the ALMA will be achieved through accurate calibration. The types of calibration are summarized in Table 3.1. Table 3.1 ALMA Calibration Requirements. Pointing 0.6" absolute Primary Beam 2-3% Baseline Determination 0.1 mm Flux Calibration 1% absolute flux accuracy goal Phase Calibration 0.15 radian at 230 GHz Bandpass Calibration 10000:1 to 100000:1 Polar...

Mechanochemical Lignin-Mediated Strecker Reaction.

A mechanochemical Strecker reaction involving a wide range of aldehydes (aromatic, heteroaromatic and aliphatic), amines, and KCN afforded a library of α-aminonitriles upon mechanical activation. This multicomponent process was efficiently activated by lignocellulosic biomass as additives. Particularly, commercially available Kraft lignin was found to be the best activator for the addition of c...

ALMA Memo XXX Bandpass Calibration for ALMA

This memo contains a detailed evaluation of the expected performance of the bandpass calibration for ALMA. We evaluate the limitations on the bandpass accuracy due to the imperfect knowledge of the atmospheric transmission. We show that the best bandpass accuracy is obtained when the amplitude calibration is applied in a single-load scheme. The proposed scheme is a variant of the so-called band...