scholarly journals The formation of the physical and chemical condition along the continuum land waters Azov Sea in the context of iron geochemistry studies

2020 ◽  
pp. 840-841
Author(s):  
Yu. Fedorov ◽  
◽  
L. Dmitrik ◽  
I. Dotsenko ◽  
◽  
...  
Keyword(s):  
Chemical Condition ◽  
Azov Sea ◽  
Physical And Chemical ◽  
The Continuum

scholarly journals Ekosistem Mangrove Binuangeun, Banten: Kondisi Fisik Dan Kimia Serta Ragam Ikan

2020 ◽  
Vol 5 (2) ◽  
pp. 32-40
Author(s):  
Fitri Andriyani
Keyword(s):  
Research Method ◽  
Mangrove Ecosystem ◽  
Water Current ◽  
Root Structure ◽  
Chemical Condition ◽  
Literature Study ◽  
Marine Animals ◽  
Mangrove Ecosystems ◽  
Chemical Conditions ◽  
Physical And Chemical

Binuangeun Mangrove Ecosystem is located in the south western Java Island, in the area of ​​Lebak Regency, Banten Province. Mangrove ecosystems are ecosystems that located at the Coastal areas which are a habitat for a variety of marine animals which are associated with it, mostly fish, because of its complex or a very effective root structure which can provide a place for fish to be able to live, take shelter, develop, breed and also look for food. This research was conducted to determine the physical and chemical condition and the variety of fishes which found in the Binuangeu, Banten Mangrove Ecosystem. This research method uses literature study. Physical and chemical conditions of the Binuangeun Mangrove Ecosystem, Banten have degrees of temperature ranging from 28.20 - 32.20; acidity range between 7.00 - 8.09; turbidity ranges from 22.50 - 76.00 NTU; water current ranged from 0.079 to 0.189; phosphate content ranges from 0.02 - 0.008; salinity ranges from 30-35 PSU; and dissolved oxygen content ranges from 5.67 - 8.70. The types of fish found in the Binuangeun Mangrove Ecosystem, Banten are 45 species from 22 Family. The most abundant and relatively high species of existence is the Gobiidae with 10 species.   Keywords: Banten, Binuangeun, Ecosystems, Fish, Mangroves

scholarly journals PERTUMBUHAN KERANGKA KARANG ACROPORA DI PERAIRAN SENGIGI LOMBOK

2019 ◽  
Vol 19 (1) ◽  
Author(s):  
Muhlis Muhlis
Keyword(s):  
T Test ◽  
Coral Skeleton ◽  
Chemical Condition ◽  
Alizarin Red ◽  
Physical And Chemical

Abstrak:Penelitian ini bertujuan 1) Mengetahui laju petumbuhan kerangka karang Acropora (Acropora nobilis dan Acropora nosuta) 2) mengidentifikasi kondisi perairan Senggigi. Pengukuran pertumbuhan karang dilakukan selama empat bulan dengan metode Alizarin red meliputi pertumbuhan panjang dan pertambahan bobot. Untuk mengetahui perbedaan pertumbuhan pada kedua jenis karang, dilakukan uji t sedangkan kondisi perairan dilakukan uji laboratorium dan dibahas secara diskriptif. Hasil penelitian menunjukan bahwa pertumbuhan panjang kerangka Acropora nobilis mencapai 17.79 mm atau 0.148 mm/hari dan Acropora nosuta mencapai 14.28 mm atau 0.12 mm/hari. Sedangkan pertambahan bobot kerangka Acropora nobilis mencapai 513.1 mg atau 4.27 mg /hari dan Acropora nosuta mencapai 264.9 mg atau 2.21 mg /hari. Uji statistik menunjukan bahwa ada perbedaan laju pertumbuhan antara kerangka karang Acropora  nobilis dan Acropora nosuta.  Kondisi fisika kimia perairan Sengigi selama penelitian rata-rata sangat baik karena masih pada kisaran batas toleransi untuk persyaratan pertumbuhan karang pada umumnya Kata kunci : Pertumbuhan; Kerangka karang; Acropora sp Abstract: Aims of this research are to know the growth of Acropora  (Acropora nobilis and Acropora nosuta) and identify waters condition of Senggigi. Measurement of the growth of length and weight increasing were carried out for four months by Alizarin methods (red). T test was applied to know difference of the growth on two sorts of the coral, whereas waters was examined in laboratory and presented by description. Results of this research points out that length of growth  of Acropora nobilis is 18.89 mm/four months or 0.15 mm/day, meanwhile Acropora nosuta reaches 15.32 mm/ four months or 0.127 mm/day. Rising of weight of Acropora nobilis is 541.2 mg/ four months or 4.8 mg/day, whereas Acropora nosuta reaches 323.5 mg/ four months or 3.1 mg/day. Statistics test shows there is a difference in the growth of length between Acropora nobilis and Acropora nosuta. During this research, physical and chemical condition of Senggigi waters was generally very good, the conditions of environment were in range of toleration for growing coral. Keywords : Growth; Coral skeleton; Acropora sp

scholarly journals Development of preservation by processing technologies of BAU kul

2014 ◽  
Vol 12 (1) ◽  
pp. 143-152
Author(s):  
MM Hasan Biswas ◽  
B Ahmed ◽  
MLJ Taneya ◽  
MB Uddin
Keyword(s):  
Proximate Analysis ◽  
Reducing Sugar ◽  
Total Sugar ◽  
Taste Panel ◽  
Local Market ◽  
Chemical Condition ◽  
Processing Technologies ◽  
Rural Industries ◽  
Physical And Chemical ◽  
Food Value

This study reports on processing of jam, jelly and chutney from BAU kul and assessing the products shelf life and food value. This study was conducted in the laboratory of the Department of Food Technology and Rural Industries, Bangladesh Agricultural University, Mymensingh. The fruits were collected from the local market and the pulp was extracted and analyzed for proximate composition. The proximate analysis of BAU kul pulp showed 86.12% moisture, 19.00% TSS, 06.04% reducing sugar, 15.16 % non-reducing sugar, 21.20% total sugar, 01.35% ash, 04.50PH, 00.44% acidity and 65mg/100g vitamin C. A total three types of products each with 3 different formulations were prepared and packed in appropriate packaging for storage studies. Products were stored at room temperatures and change their physical and chemical condition during storage was observed at an interval of 30 days for a period of four months. A taste panel consisting 10 panelists studied the acceptability of the samples. The consumer’s preferences were measured by statistical analysis of the scores obtained from the responses of the taste panel. Among the samples jam of (TSS – 65.50%, pectin – 0.5%, PH – 3.10), jelly of (TSS – 66.50%, pectin 0.5% and PH – 3.15) and chutney of (TSS – 65.5%, PH – 3.20) were awarded the highest scores by the panelists. DOI: http://dx.doi.org/10.3329/jbau.v12i1.21404 J. Bangladesh Agril. Univ. 12(1): 143-152, June 2014

Combined Steel Treatment with Calcium-Silicon

2015 ◽  
Vol 770 ◽  
pp. 114-120
Author(s):  
R.A. Gizatulin ◽  
A.B. Efremenkov ◽  
D.V. Valuev ◽  
S.N. Fedoseev ◽  
A.V. Valueva
Keyword(s):  
Industry Data ◽  
Chemical Condition ◽  
Calcium Silicon ◽  
Physical And Chemical ◽  
Steel Treatment

The method of adding calcium silicon in aluminum containers to a metal when it pours into a ladle from the steelmaking unit has been developed. Industry data were obtained to confirm the possibility of providing a sufficiently high and stable recovery of calcium in the context of production at a particular plant and its effective impact on the composition, physical and chemical condition of a melt and properties of a final product.

scholarly journals Physical and chemical fingerprint of protostellar disc formation

2019 ◽  
Vol 626 ◽  
pp. A71 ◽  
Author(s):  
E. Artur de la Villarmois ◽  
J. K. Jørgensen ◽  
L. E. Kristensen ◽  
E. A. Bergin ◽  
D. Harsono ◽  
...  
Keyword(s):  
Chemical Composition ◽  
Accretion Rate ◽  
Stellar Mass ◽  
Class I ◽  
High Angular Resolution ◽  
Mass Accretion Rate ◽  
Bolometric Luminosity ◽  
Stellar Masses ◽  
Physical And Chemical ◽  
The Continuum

Context. The structure and composition of emerging planetary systems are likely strongly influenced by their natal environment within the protoplanetary disc at the time when the star is still gaining mass. It is therefore essential to identify and study the physical processes at play in the gas and dust close to young protostars and investigate the chemical composition of the material that is inherited from the parental cloud. Aims. The purpose of this paper is to explore and compare the physical and chemical structure of Class I low-mass protostellar sources on protoplanetary disc scales. Methods. We present a study of the dust and gas emission towards a representative sample of 12 Class I protostars from the Ophiuchus molecular cloud with the Atacama Large Millimeter/submillimeter Array (ALMA). The continuum at 0.87 mm and molecular transitions from C17O, C34S, H13CO+, CH3OH, SO2, and C2H were observed at high angular resolution (0.′′4, ~60 au diameter) towards each source. The spectrally and spatially resolved maps reveal the kinematics and the spatial distribution of each species. Moreover, disc and stellar masses are estimated from the continuum flux and position-velocity diagrams, respectively. Results. Six of the sources show disc-like structures in C17O, C34S, or H13CO+ emission. Towards the more luminous sources, compact emission and large line widths are seen for transitions of SO2 that probe warm gas (Eu ~ 200 K). In contrast, C17O emission is detected towards the least evolved and less luminous systems. No emission of CH3OH is detected towards any of the continuum peaks, indicating an absence of warm CH3OH gas towards these sources. Conclusions. A trend of increasing stellar mass is observed as the envelope mass decreases. In addition, a power-law relation is seen between the stellar mass and the bolometric luminosity, corresponding to a mass accretion rate of (2.4 ± 0.6) × 10−7 M⊙ yr−1 for the Class I sources, with a minimum and maximum value of 7.5 × 10−8 and 7.6 × 10−7 M⊙ yr−1, respectively. This mass accretion rate is lower than the expected value if the accretion is constant in time and rather points to a scenario of accretion occurring in bursts. The differentiation between C17O and SO2 suggests that they trace different physical components: C17O traces the densest and colder regions of the disc-envelope system, while SO2 may be associated with regions of higher temperature, such as accretion shocks. The lack of warm CH3OH emission suggests that there is no hot-core-like region around any of the sources and that the CH3OH column density averaged over the disc is low. Finally, the combination of bolometric temperature and luminosity may indicate an evolutionarytrend of chemical composition during these early stages.

Landscape Investigation on External Corrosion and SCC of a Tape Coated Enbridge Pipeline

2012 ◽  
Author(s):  
Abdoulmajid Eslami ◽  
Trevor Place ◽  
Shamus McDonnell ◽  
Chijioke Ukiwe ◽  
Qin You
Keyword(s):  
Chemical Condition ◽  
Predictive Tool ◽  
Management Processes ◽  
Integrity Management ◽  
Ground Slope ◽  
Landscape Factors ◽  
Positive Correlations ◽  
External Corrosion ◽  
Physical And Chemical

It is generally believed that physical and chemical condition of the pipeline environment (such as soil texture, drainage, ground topography, cathodic protection level, pH, etc) in addition to pipeline construction factors (such as pipe vs. ground slope, type and quality of the pipe coating, etc.) affect the incidence and severity of external corrosion and SCC on pipelines. In an attempt to identify locations of highest susceptibility to external corrosion and cracking on a tape coated Enbridge pipeline, and to aid integrity management processes; Enbridge embarked on a project investigating landscape factors which might affect the severity of external corrosion and stress corrosion cracking (SCC) on the pipeline. Results showed that some of the investigated factors had positive correlations with the severity of external corrosion and SCC on the tape coated pipeline. However, despite the positive correlations observed, they were not strong enough to be used as an independent predictive tool.

C. The Continuous Spectrum of Pulsating Variable Stars

1967 ◽  
Vol 28 ◽  
pp. 177-206
Author(s):  
J. B. Oke ◽  
C. A. Whitney
Keyword(s):  
Continuous Spectrum ◽  
Variable Stars ◽  
Velocity Fields ◽  
The Other ◽  
Line Spectrum ◽  
Direct Information ◽  
Thermodynamic Structure ◽  
Diagnostic Interpretation ◽  
Pulsating Variable Stars ◽  
The Continuum

Pecker:The topic to be considered today is the continuous spectrum of certain stars, whose variability we attribute to a pulsation of some part of their structure. Obviously, this continuous spectrum provides a test of the pulsation theory to the extent that the continuum is completely and accurately observed and that we can analyse it to infer the structure of the star producing it. The continuum is one of the two possible spectral observations; the other is the line spectrum. It is obvious that from studies of the continuum alone, we obtain no direct information on the velocity fields in the star. We obtain information only on the thermodynamic structure of the photospheric layers of these stars–the photospheric layers being defined as those from which the observed continuum directly arises. So the problems arising in a study of the continuum are of two general kinds: completeness of observation, and adequacy of diagnostic interpretation. I will make a few comments on these, then turn the meeting over to Oke and Whitney.

Photo-electric Hβ and uvby photometry

1966 ◽  
Vol 24 ◽  
pp. 170-180
Author(s):  
D. L. Crawford
Keyword(s):  
Narrow Band ◽  
Line Strength ◽  
Interference Filter ◽  
B Stars ◽  
Relative Line ◽  
The Mean ◽  
F Stars ◽  
Two Parameters ◽  
Filter Photometry ◽  
The Continuum

Early in the 1950's Strömgren (1, 2, 3, 4, 5) introduced medium to narrow-band interference filter photometry at the McDonald Observatory. He used six interference filters to obtain two parameters of astrophysical interest. These parameters he calledlandc, for line and continuum hydrogen absorption. The first measured empirically the absorption line strength of Hβby means of a filter of half width 35Å centered on Hβand compared to the mean of two filters situated in the continuum near Hβ. The second index measured empirically the Balmer discontinuity by means of a filter situated below the Balmer discontinuity and two above it. He showed that these two indices could accurately predict the spectral type and luminosity of both B stars and A and F stars. He later derived (6) an indexmfrom the same filters. This index was a measure of the relative line blanketing near 4100Å compared to two filters above 4500Å. These three indices confirmed earlier work by many people, including Lindblad and Becker. References to this earlier work and to the systems discussed today can be found in Strömgren's article inBasic Astronomical Data(7).

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