scholarly journals A Quantitative Study of the Fauna of the Sandy Beach at Port Erin

1932 ◽  
Vol 18 (1) ◽  
pp. 279-296 ◽  
Author(s):  
Marjorie E. Pirrie ◽  
J. R. Bruce ◽  
H. B. Moore
Keyword(s):  
Quantitative Study ◽  
Dominant Species ◽  
Sandy Beach ◽  
Interstitial Water ◽  
Tidal Level ◽  
Isle Of Man ◽  
Chemical Factors ◽  
Physical And Chemical ◽  
Made In

A survey of the sandy beach at Port Erin, Isle of Man, was made in. September, 1931. Observations were made, at a number of stations, involving simultaneous records of the macro-fauna and its density, and certain physical and chemical factors of the sand and interstitial water, as well as tidal level on the beach. The results enable certain general conclusions to be drawn as to the causes of the observed distribution of species, and of the differences between the faunas of this and some Scottish beaches. Plans are given, indicating tidal contours, salinity, and grade composition, in situ on the beach, together with frequency diagrams for five dominant species.

The Qualitative and Quantitative Distribution of Plankton in the Strait of Georgia in Relation to Certain Oceanographic Factors

1957 ◽  
Vol 14 (4) ◽  
pp. 521-552 ◽  
Author(s):  
Joseph Eugène Henri Légaré
Keyword(s):  
Salinity Gradient ◽  
General Distribution ◽  
Fraser River ◽  
Strait Of Georgia ◽  
Quantitative Distribution ◽  
Qualitative And Quantitative ◽  
Chemical Factors ◽  
Physical And Chemical ◽  
Plankton Communities ◽  
Made In

In order to gain some picture of the seasonal variations in the plankton communities two cruises were made in the Strait of Georgia, one in June 1955, and the other in November 1955; 165 plankton collections were taken, also surface temperatures.The correlation of these data have resulted in a number of conclusions concerning the distribution of plankton in the Strait of Georgia. The chief factor affecting the general distribution of plankton is the salinity gradient. The inflow of fresh water from the Fraser River forms zones of varying properties, and leads to the development of different plankton communities. The extent to which physical and chemical factors may determine the presence or absence of certain organisms from the zones described is discussed.

scholarly journals The Evaluation of a Risk Degree for the Process of a Brown Coal Spontaneous Ignition on Dumps with Using of Modern Numeric Methods

2018 ◽  
Vol 26 (2) ◽  
pp. 71-75
Author(s):  
Petr Klouda ◽  
Vlastimil Moni ◽  
Michal Řehoř ◽  
Jan Blata ◽  
František Helebrant
Keyword(s):  
Brown Coal ◽  
Barometric Pressure ◽  
Spontaneous Ignition ◽  
Atmospheric Conditions ◽  
Database Analysis ◽  
Chemical Factors ◽  
Risk Degree ◽  
Physical And Chemical

Abstract The article is a summary of information about evaluation of a risk degree for a brown coal spontaneous ignition which is realized on the base of a database analysis of information about the development of stative quantities and desorbated gases in the stored bodies of the brown coal. The data were gained from the long term complex measurements which were realized at chosen companies during the coal mining in the previous parts of the project. In the last part of the project, we examined results of temperature models from thermographs with results of gasses and coal samples from the mines. Then, the influence of atmospheric conditions (insolation, water downfall, changes of barometric pressure etc.), the influence of coal mass degradation, the influence of physical and chemical factors, and the influence of other defective factors on the process of the coal spontaneous ignition. The gasmetry was assess with gas in-situ samples and laboratory gas models of indicative gasses for the spontaneous ignition, which were taken from the method of the thermic oxidation with the aim of the correlation finding for an epicentre of temperature within the spontaneous ignition.

scholarly journals Influence of Ecological Factors on Population Morbidity Indicators

10.12737/8227 ◽  
2015 ◽  
Vol 4 (1) ◽  
pp. 18-29
Author(s):  
Рисник ◽  
D. Risnik ◽  
Барабаш ◽  
A. Barabash ◽  
Левич ◽  
...  
Keyword(s):  
Ecological Factors ◽  
Range Limits ◽  
Environmental Standards ◽  
Normal Range ◽  
Environment Quality ◽  
Deep Well ◽  
Drinking Waters ◽  
Chemical Factors ◽  
Physical And Chemical

On the Tambov region example a research related to deep-well drinking waters’ composition influence on able-bodied population morbidity in 16 classes of diseases on the international classification has been performed. Correlation analysis, contingency tables analysis, local environmental standards calculation method (LES method) have been used for this purpose. Environment quality control in-situ-technology bases have been presented. Normal range limits of deep-well waters’ physical and chemical factors, as well as of morbidity in different classes of diseases have been calculated by means of the LES method.

Adhesion of Elastomers, with Special Reference to Triblock Copolymers

1978 ◽  
Vol 51 (2) ◽  
pp. 354-364 ◽  
Author(s):  
A. N. Gent ◽  
G. R. Hamed
Keyword(s):  
Triblock Copolymers ◽  
Thermoplastic Elastomers ◽  
Random Copolymers ◽  
Plastic Yielding ◽  
Dissipation Process ◽  
Substrate Adhesion ◽  
Chemical Factors ◽  
Physical And Chemical ◽  
Strength Of Adhesion

Abstract Several physical and chemical factors affect the strength of adhesion (as measured by a peeling method) for elastomers adhering to rigid substrates. These factors include: the thickness of the elastomer layer (and of an adhering backing, if present); the rate of detachment and the test temperature; and the presence of chemical bonds between elastomer and the substrate. Adhesion of thermoplastic elastomers, i.e., SBS triblock copolymers, applied as hot melts, is much stronger than for the corresponding random copolymers, crosslinked in situ. These materials also show higher cohesive (tear) strength. Both effects probably arise from the same cause: an energy-dissipation process which operates at large stresses and prevents brittle fracture. This process is thought to be plastic yielding of the polystyrene domains.

Hydrographic Observations in the Eastern Irish Sea With Particular Reference to the Distribution of Nutrient Salts

1971 ◽  
Vol 51 (1) ◽  
pp. 159-182 ◽  
Author(s):  
P. G. W. Jones ◽  
A. R. Folkard
Keyword(s):  
Organic Phosphorus ◽  
Irish Sea ◽  
Liverpool Bay ◽  
Isle Of Man ◽  
Phosphate Nitrate ◽  
Distribution And Ecology ◽  
The Irish Sea ◽  
Physical And Chemical ◽  
Current Systems ◽  
Made In

INTRODUCTIONStudies on the physical hydrography of the Irish Sea, based mainly on temperature and salinity observations, have been made by Bowden (1955) and Lee (1960). The current systems in various parts of the Irish Sea have been investigated by Bowden & Sharaf El Din (1966), Harvey (1968), Ramster & Hill (1969) and Hill & Ramster (1971). Various smaller-scale physical observations made by other workers have been listed by the above authors.There are not as many references in the literature to the distribution of nutrient salts in the Irish Sea. Jones & Haq (1963) measured phosphate in Liverpool Bay as part of an investigation into the distribution of the alga Phaeocystis. Slinn & Offlow (1968) have made regular routine measurements of phosphate, nitrate and silicate over a number of years off Port Erin, Isle of Man. Ewins & Spencer (1967) measured phosphate, organic phosphorus, nitrate and silicate in the Menai Straits, and Liss (1969) surveyed the distribution of silicate in the western Irish Sea.During recent years the Fisheries Laboratory at Lowestoft has investigated the distribution and ecology of plankton and larval plaice in the Irish Sea, and a supporting programme of both physical and chemical hydrographic observations has been made in the area. Ramster & Hill (1969) and Hill & Ramster (1971) have summarized the results of the Lowestoft current measurements. The present paper describes an investigation into the distribution of temperature, salinity, phosphate, nitrate and silicate. The occurrence of Phaeocystis is also reported as an extension of the earlier work by Jones & Haq (1963).

scholarly journals STUDI FAKTOR FISIKA KIMIA PERAIRAN TERHADAP BIOTA AKUATIK DI EKOSISTEM SUNGAI BELAWAN

2017 ◽  
Author(s):  
Seminar Nasional Multidisiplin Ilmu 2017 ◽  
Khairul
Keyword(s):  
Laboratory Test ◽  
Aquatic Ecosystems ◽  
Ex Situ ◽  
Aquatic Biota ◽  
Average Flow ◽  
Average Flow Velocity ◽  
Chemical Factors ◽  
Average Water ◽  
Physical And Chemical

The purpose of this research is to know the condition of physical and chemical factors in aquatic biota in aquatic ecosystems against River Belawan. This research uses a method of exploration with the taking of sampling is carried out for 3 months. The taking of sampling is carried out in situ and ex situ (laboratory test). Based on the research results at the 3rd station observations can be known to the average of the highest water temperature at station 1 (29, 5 OC) and lowest in station 3 (27 OC), brightness of the highest average water at station 3 (76 cm) and the lowest in station 2 (72 cm), the average flow velocity is highest at station 1 (9.5 m/s) and the lowest in station 3 (5.3 m/s), the pH of the water the highest average at station 2 (6.8) and the lowest in station 3 (6.8), the highest average salinity at station 1 (15, 7ppt) and the lowest station 3 (5.4 ppt), DO the highest average at stations 1 and 2 (3.5 mg/litre) and lowest in station 3 (3.4 mg/liter), the highest average BOD on station 1 (6.3 mg/litre) and lowest in station 2 (0.5 mg/litre), nitrate average high at station 1 (13.1 mg/litre) and lowest in station 1 (3.9 mg/liter), and the highest average phosphate at station 3 (0.53 mg/litre) and lowest in station 1 (0.3 mg/litre).

A QUANTITATIVE STUDY OF SPERMATOGENESIS IN RATS BEARING HYPOTHALAMIC LESIONS OF MAMMILLARY AND SUPRA-CHIASMATIC NUCLEI

1969 ◽  
Vol 60 (2) ◽  
pp. 276-280
Author(s):  
Bernard A. Rüedi
Keyword(s):  
Quantitative Analysis ◽  
Quantitative Study ◽  
Germinal Cell ◽  
Suprachiasmatic Nuclei ◽  
Hypothalamic Lesions ◽  
Cell Counts ◽  
Significant Change ◽  
Bilateral Lesions ◽  
Made In

ABSTRACT A quantitative analysis of spermatogenesis has been made in rats bearing bilateral lesions of the lateral mammillary nuclei or of the suprachiasmatic nuclei of the hypothalamus. There was no significant change in the germinal cell counts in lesioned rats as compared either with normal or with sham operated rats.

scholarly journals Enhanced Tensile Strength of Monolithic Epoxy with Highly Dispersed TiO2-Graphene Nanocomposites

2021 ◽  
Vol 5 (7) ◽  
pp. 191
Author(s):  
Yanshuai Wang ◽  
Siyao Guo ◽  
Biqin Dong ◽  
Feng Xing
Keyword(s):  
Tensile Strength ◽  
Epoxy Resin ◽  
Mechanical Performance ◽  
Chemical Properties ◽  
High Mechanical Property ◽  
Graphene Nanocomposites ◽  
Highly Dispersed ◽  
Dispersion State ◽  
Physical And Chemical

The functionalization of graphene has been reported widely, showing special physical and chemical properties. However, due to the lack of surface functional groups, the poor dispersibility of graphene in solvents strongly limits its engineering applications. This paper develops a novel green “in-situ titania intercalation” method to prepare a highly dispersed graphene, which is enabled by the generation of the titania precursor between the layer of graphene at room temperature to yield titania-graphene nanocomposites (TiO2-RGO). The precursor of titania will produce amounts of nano titania between the graphene interlayers, which can effectively resist the interfacial van der Waals force of the interlamination in graphene for improved dispersion state. Such highly dispersed TiO2-RGO nanocomposites were used to modify epoxy resin. Surprisingly, significant enhancement of the mechanical performance of epoxy resin was observed when incorporating the titania-graphene nanocomposites, especially the improvements in tensile strength and elongation at break, with 75.54% and 176.61% increases at optimal usage compared to the pure epoxy, respectively. The approach presented herein is easy and economical for industry production, which can be potentially applied to the research of high mechanical property graphene/epoxy composite system.

Engaging with the science and politics of biodiversity futures: a literature review

2021 ◽  
pp. 1-8
Author(s):  
Carina Wyborn ◽  
Elena Louder ◽  
Mike Harfoot ◽  
Samantha Hill
Keyword(s):  
Human Life ◽  
Global Environmental Change ◽  
Life Forms ◽  
Trade Offs ◽  
Global Environmental ◽  
Science And Politics ◽  
Science Community ◽  
Impact On Biodiversity ◽  
Made In

Summary Future global environmental change will have a significant impact on biodiversity through the intersecting forces of climate change, urbanization, human population growth, overexploitation, and pollution. This presents a fundamental challenge to conservation approaches, which seek to conserve past or current assemblages of species or ecosystems in situ. This review canvases diverse approaches to biodiversity futures, including social science scholarship on the Anthropocene and futures thinking alongside models and scenarios from the biophysical science community. It argues that charting biodiversity futures requires processes that must include broad sections of academia and the conservation community to ask what desirable futures look like, and for whom. These efforts confront political and philosophical questions about levels of acceptable loss, and how trade-offs can be made in ways that address the injustices in the distribution of costs and benefits across and within human and non-human life forms. As such, this review proposes that charting biodiversity futures is inherently normative and political. Drawing on diverse scholarship united under a banner of ‘futures thinking’ this review presents an array of methods, approaches and concepts that provide a foundation from which to consider research and decision-making that enables action in the context of contested and uncertain biodiversity futures.

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