Bottom Rock Material of Polar Seas: Distribution, Composition, and Genesis

Oceanology ◽  
2020 ◽  
Vol 60 (6) ◽  
pp. 840-853
Author(s):  
G. S. Kharin ◽  
D. V. Eroshenko
Keyword(s):  
Rock Material ◽  
Distribution Composition ◽  
Bottom Rock

Petrography of bottom rock material

2021 ◽  
pp. 492-530
Author(s):  
G.S. Kharin ◽  
◽  
D.V. Eroshenko ◽  
A.V. Bulokhov ◽  
S.M. Isachenko ◽  
...  
Keyword(s):  
Barents Sea ◽  
Distribution Patterns ◽  
Geological Mapping ◽  
Rock Material ◽  
Quaternary Sediments ◽  
Petrographic Composition ◽  
The Barents Sea ◽  
Mineral Compositions ◽  
The Relationship ◽  
Bottom Rock

The Quaternary sediments of the Barents Sea contain a large amount of coarse clastic bottom rock material (BRM), with varying degrees of grain roundedness. Its study is important in determining the type and composition of the earth's crust, with paleogeographic constructions and revealing data on the dynamics of the ice cover. Studies of the Barents Sea BRM began in the 20s of the last century. During this period, were formed basically two hypotheses about the relationship between the distribution of BRM with elements of the sea topography and bedrock exposure. One of them considers BRM a marker suitable for identifying petrographic provinces at the bottom of the Barents Sea [Klenova, 1960]. In this chapter, on the basis of new up-to-date data obtained in 67 and 68 cruises of the RV Akademik Mstislav Keldysh in 2016–2017, the grain size, petrochemical and mineral compositions of BRM are estimated, their distribution patterns are given, transportation methods are analyzed and its feasibility is evaluated use in geological mapping. 4,193 samples were processed in Quaternary sediments, among which 86 reference types were identified. It was shown that the diversity of the composition of the Barents Sea BRM depends on glacial and ice-ice spacing. Therefore, the use of BRM for geological mapping of the bottom of the Barents Sea is unsuitable. The petrographic composition of the BRM in different regions of the Barents Sea is subject to significant fluctuations, but in general it is complementary to the set of rocks in the areas of demolition of adjacent land and depends on the extent of exaration and the removal of exaration material by the glacier to sedimentation areas.

Distribution of altered rock material in the Kerber Creek drainage basin, Saguache County, Colorado

1999 ◽  
Author(s):  
K.E. Livo ◽  
Ken Watson ◽  
D.H. Knepper ◽  
Susanne Hummer-Miller
Keyword(s):  
Drainage Basin ◽  
Rock Material ◽  
Altered Rock

scholarly journals Glycosaminoglycans: Carriers and Targets for Tailored Anti-Cancer Therapy

Biomolecules ◽  
2021 ◽  
Vol 11 (3) ◽  
pp. 395
Author(s):  
Aikaterini Berdiaki ◽  
Monica Neagu ◽  
Eirini-Maria Giatagana ◽  
Andrey Kuskov ◽  
Aristidis M. Tsatsakis ◽  
...  
Keyword(s):  
Cancer Therapy ◽  
Targeted Delivery ◽  
Academic Research ◽  
Cancer Therapeutics ◽  
Disease Evolution ◽  
Structure Changes ◽  
Recent Developments ◽  
Distribution Composition ◽  
Membrane Components ◽  
Cancer Tissues

The tumor microenvironment (TME) is composed of cancerous, non-cancerous, stromal, and immune cells that are surrounded by the components of the extracellular matrix (ECM). Glycosaminoglycans (GAGs), natural biomacromolecules, essential ECM, and cell membrane components are extensively altered in cancer tissues. During disease progression, the GAG fine structure changes in a manner associated with disease evolution. Thus, changes in the GAG sulfation pattern are immediately correlated to malignant transformation. Their molecular weight, distribution, composition, and fine modifications, including sulfation, exhibit distinct alterations during cancer development. GAGs and GAG-based molecules, due to their unique properties, are suggested as promising effectors for anticancer therapy. Considering their participation in tumorigenesis, their utilization in drug development has been the focus of both industry and academic research efforts. These efforts have been developing in two main directions; (i) utilizing GAGs as targets of therapeutic strategies and (ii) employing GAGs specificity and excellent physicochemical properties for targeted delivery of cancer therapeutics. This review will comprehensively discuss recent developments and the broad potential of GAG utilization for cancer therapy.

scholarly journals Determination of Mechanical Properties of Altered Dacite by Laboratory Methods

Minerals ◽  
2021 ◽  
Vol 11 (8) ◽  
pp. 813
Author(s):  
Veljko Rupar ◽  
Vladimir Čebašek ◽  
Vladimir Milisavljević ◽  
Dejan Stevanović ◽  
Nikola Živanović
Keyword(s):  
Mechanical Properties ◽  
Compressive Strength ◽  
Rock Mass ◽  
Uniaxial Compressive Strength ◽  
Rock Material ◽  
Strength Parameter ◽  
Gradual Transition ◽  
Strength Parameters ◽  
Triaxial Compressive Strength ◽  
Heterogeneous Rock

This paper presents a methodology for determining the uniaxial and triaxial compressive strength of heterogeneous material composed of dacite (D) and altered dacite (AD). A zone of gradual transition from altered dacite to dacite was observed in the rock mass. The mechanical properties of the rock material in that zone were determined by laboratory tests of composite samples that consisted of rock material discs. However, the functional dependence on the strength parameter alteration of the rock material (UCS, intact UCS of the rock material, and mi) with an increase in the participation of “weaker” rock material was determined based on the test results of uniaxial and triaxial compressive strength. The participation of altered dacite directly affects the mode and mechanism of failure during testing. Uniaxial compressive strength (σciUCS) and intact uniaxial compressive strength (σciTX) decrease exponentially with increased AD volumetric participation. The critical ratio at which the uniaxial compressive strength of the composite sample equals the strength of the uniform AD sample was at a percentage of 30% AD. Comparison of the obtained exponential equation with practical suggestions shows a good correspondence. The suggested methodology for determining heterogeneous rock mass strength parameters allows us to determine the influence of rock material heterogeneity on the values σciUCS, σciTX, and constant mi. Obtained σciTX and constant mi dependences define more reliable rock material strength parameter values, which can be used, along with rock mass classification systems, as a basis for assessing rock mass parameters. Therefore, it is possible to predict the strength parameters of the heterogeneous rock mass at the transition of hard (D) and weak rock (AD) based on all calculated strength parameters for different participation of AD.

Microstructure and Corrosion Resistance of HVOF Sprayed 316L Stainless Steel and Ni Base Alloy Coatings

2000 ◽  
Author(s):  
S. Kuroda ◽  
T. Fukushima ◽  
T. Kodama ◽  
M. Sasaki
Keyword(s):  
Stainless Steel ◽  
Corrosion Resistance ◽  
316L Stainless Steel ◽  
Sea Water ◽  
Base Alloy ◽  
Standard Condition ◽  
Polarization Measurement ◽  
Superior Corrosion Resistance ◽  
Distribution Composition ◽  
The Impact

Abstract 316L stainless steel and Hastelloy C alloy powders were sprayed by an HVOF apparatus onto mild steel substrates. The microstructure, pore size distribution, composition and corrosion resistance of thus obtained coatings were evaluated experimentally. Corrosion resistance in sea-water was examined by monitoring the impedance and corrosion potential of samples immersed in artificial sea-water at 300 K over a period of more than 3 months and also by polarization measurement. It was found that the stainless coatings composed mainly of plastically deformed particles and some splats which were molten at the impact. By increasing the combustion pressure, the porosity as measured by mercury porosimeter could be reduced to below 1%. In comparison, Hastelloy C deposits sprayed under the standard condition were so dense that its porosity could not be measured by the porosimeter. The polarization curve and the results of impedance monitoring both exemplified that the Hastelloy C coatings possess much superior corrosion resistance to the stainless coatings in sea-water, which was attributed to the higher density and better adhesion of the Ni-base alloy coatings.

II.—Evidence bearing upon the Position of the Twt Hill Conglomerate

1881 ◽  
Vol 8 (5) ◽  
pp. 194-197 ◽  
Author(s):  
R. D. Roberts
Keyword(s):  
Quarterly Journal ◽  
Granitoid Rock ◽  
Geological Society ◽  
True Position ◽  
Bottom Rock

A discussion has more than once arisen, in the course of the last two years, respecting the true position or the quartz conglomerate exposed near Twt Hill, Carnarvon, which was first described by Prof. Bonney and Mr. Houghton in the Quarterly Journal of the Geological Society, vol. xxxv. p. 321. The typical quarry is situated on the S.E. side of the ridge, close underneath Twt Hill, and the exposure there shows the quartz conglomerate in juxtaposition to the granitoid rock that constitutes the axis of the ridge. The authors describe a passage between the granitoidite below and the conglomerate above, and state that the latter “passes lip into a rock which has some resemblance to the bottom rock” (granitoidite). In the GEOL. MAG. for March, 1880, p. 118, Dr. Callaway writes: “Messrs. Bonney and Houghton have detected at Twt Hill a passage between the granitoidite and a quartzose conglomerate with a S.E. dip. I have visited this section, and having examined the rock inch by inch, I can entirely confirm their identification.”

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