scholarly journals The Neutral Envelopes of Planetary Nebulae: Molecules and H I

1993 ◽  
Vol 155 ◽  
pp. 147-154 ◽  
Author(s):  
P.J. Huggins
Keyword(s):  
Chemical Properties ◽  
Planetary Nebulae ◽  
Physical And Chemical Properties ◽  
Agb Stars ◽  
Subsequent Evolution ◽  
Neutral Gas ◽  
Recent Developments ◽  
Molecular Lines ◽  
Physical And Chemical ◽  
And Chemical Properties

This paper summarizes recent developments in the study of planetary nebulae using observations of molecular lines and the 21 cm line of H I. The observations reveal that many planetary nebulae are surrounded by envelopes of neutral gas, whose mass often exceeds that of the ionized nebulae. They also provide valuable information on the physical and chemical properties of the envelopes, their structure, and kinematics. The neutral envelopes firmly link the formation of planetary nebulae with the mass loss by AGB stars, and can play an important role in the subsequent evolution of the nebulae.

Recent developments in the utility of saturated azaheterocycles in peptidomimetics

2022 ◽  
Author(s):  
Manish Kumar Singh ◽  
Mahesh K Lakshman
Keyword(s):  
Chemical Properties ◽  
Physical And Chemical Properties ◽  
Recent Developments ◽  
Physical And Chemical ◽  
And Chemical Properties

To large extent, the physical and chemical properties of peptidomimetic molecules are dictated by the integrated heterocyclic scaffolds they contain. Heterocyclic moieties are introduced into a majority of peptide-mimicking molecules...

Properties of Open Clusters in the Regions of the Local Bubble and the Eridanus Superbubble

2015 ◽  
Vol 24 (1) ◽  
Author(s):  
M. L. Gozha ◽  
V. A. Marsakov
Keyword(s):  
Chemical Properties ◽  
Thin Disk ◽  
Open Clusters ◽  
Physical And Chemical Properties ◽  
Local Bubble ◽  
Neutral Gas ◽  
The Galaxy ◽  
Northern Edge ◽  
Physical And Chemical ◽  
And Chemical Properties

AbstractFeatures of the relative positions of open clusters and two superbubbles in the vicinity of the Sun, the Local Bubble and the Eridanus Superbubble, are considered. It is shown that the open clusters are concentrated toward the neutral gas shell of the Local Bubble, while there is a deficiency of clusters inside the cavity. All clusters associated with the Eridanus Superbubble belong to a compact group at the northern edge of the shell; no clusters are present inside the superbubble. Kinematics, age, and other physical and chemical properties of the clusters are investigated. It is found that the metal-deficient clusters and the clusters with high velocities are absent in the sample considered; i.e. the properties of the clusters associated with the Local Bubble and the Eridanus Superbubble are typical of the thin disk objects of the Galaxy.

scholarly journals SuperMALT: Physical and Chemical Properties of Massive and Dense Clumps

2017 ◽  
Vol 13 (S332) ◽  
pp. 254-260
Author(s):  
Sudeep Neupane ◽  
Guido Garay ◽  
Yanett Contreras ◽  
Keyword(s):  
Angular Resolution ◽  
Chemical Properties ◽  
Evolutionary Stage ◽  
Physical And Chemical Properties ◽  
Line Profiles ◽  
High Excitation ◽  
Physical Chemical ◽  
Molecular Lines ◽  
Physical And Chemical ◽  
And Chemical Properties

AbstractThe SuperMALT survey is observing 76 MALT90 clumps at different evolutionary stages (from pre-stellar or quiescent to HII) in high excitation molecular lines and key isotopomers using the Apex 12m telescope with an angular resolution of ∼20” and a velocity resolution of ∼0.1 km/s. The aim of this survey is to determine the physical, chemical, and kinematical properties of the gas within clumps as they evolve. Here we report some preliminary results based on observations of the J=3-2 & 4-3 lines of HNC, HCN, HCO+, N2H+ and of the J=3-2 line of the isotopologue H13CO+. We find that the morphologies and line profiles vary with the evolutionary stage of the clumps. The average line width increases from quiescent to HII clumps while line ratios show hint of chemical differences among the various evolutionary stages.

Statistical criteria of stellar population types

1966 ◽  
Vol 24 ◽  
pp. 101-110
Author(s):  
W. Iwanowska
Keyword(s):  
Stellar Population ◽  
Chemical Properties ◽  
Spectrophotometric Study ◽  
Physical And Chemical Properties ◽  
Population Type ◽  
The Galaxy ◽  
Distribution Parameters ◽  
Physical And Chemical ◽  
Statistical Criteria ◽  
And Chemical Properties

In connection with the spectrophotometric study of population-type characteristics of various kinds of stars, a statistical analysis of kinematical and distribution parameters of the same stars is performed at the Toruń Observatory. This has a twofold purpose: first, to provide a practical guide in selecting stars for observing programmes, second, to contribute to the understanding of relations existing between the physical and chemical properties of stars and their kinematics and distribution in the Galaxy.

Response of corn (Zea mays L.) to various organic-based fertilizers in marginal upland of Sta. Rita, Samar

2017 ◽  
pp. 31-43
Author(s):  
Berta Ratilla ◽  
Loreme Cagande ◽  
Othello Capuno
Keyword(s):  
Block Design ◽  
Management Strategies ◽  
Chemical Properties ◽  
Organic Fertilizers ◽  
Growth And Yield ◽  
Physical And Chemical Properties ◽  
Total N ◽  
Randomized Complete Block Design ◽  
Physical And Chemical ◽  
And Chemical Properties

Organic farming is one of the management strategies that improve productivity of marginal uplands. The study aimed to: (1) evaluate effects of various organic-based fertilizers on the growth and yield of corn; (2) determine the appropriate combination for optimum yield; and (3) assess changes on the soil physical and chemical properties. Experiment was laid out in Randomized Complete Block Design, with 3 replications and 7 treatments, namely; T0=(0-0-0); T1=1t ha-1 Evans + 45-30-30kg N, P2O5, K2O ha-1; T2=t ha-1 Wellgrow + 45-30-30kg N, P2O5, K2O ha-1; T3=15t ha-1 chicken dung; T4=10t ha-1 chicken dung + 45-30-30kg N, P2O5, K2O ha-1; T5=15t ha-1 Vermicast; and T6=10t ha-1 Vermicast + 45-30-30kg N, P2O5, K2O ha-1. Application of organic-based fertilizers with or without inorganic fertilizers promoted growth of corn than the control. But due to high infestation of corn silk beetle(Monolepta bifasciata Horns), its grain yield was greatly affected. In the second cropping, except for Evans, any of these fertilizers applied alone or combined with 45-30-30kg N, P2O5, K2O ha-1 appeared appropriate in increasing corn earyield. Soil physical and chemical properties changed with addition of organic fertilizers. While bulk density decreased irrespective of treatments, pH, total N, available P and exchangeable K generally increased more with chicken dung application.

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