scholarly journals Uranium(VI) and neptunium(V) transport through fractured, hydrothermally altered concrete

2000 ◽  
Vol 88 (9-11) ◽  
Author(s):  
S.L. Matzen ◽  
J.M. Beiriger ◽  
P.C. Torretto ◽  
P. Zhao ◽  
B.E. Viani
Keyword(s):  
Chemical Properties ◽  
High Level Waste ◽  
Physical And Chemical Properties ◽  
Hydrothermal Conditions ◽  
Concrete Core ◽  
The Core ◽  
Waste Repository ◽  
High Level ◽  
Physical And Chemical ◽  
And Chemical Properties

In a high level waste repository in which temperatures are elevated due to waste decay, concrete structures will be subjected to hydrothermal conditions that will alter their physical and chemical properties. Virtually no studies have examined the interaction of hydrothermally altered concrete with radionuclides. We present the results of experiments in which soluble and colloid-associated U and Np, were eluted into a fractured, hydrothermally altered concrete core. Although the fluid residence time in the fracture was estimated to be on the order of 1 minute, U and Np in the effluent from the core were below detection (10

scholarly journals A Blueprint for the Synthesis and Characterization of Thiolated Graphene

Nanomaterials ◽  
2021 ◽  
Vol 12 (1) ◽  
pp. 45
Author(s):  
Maxim K. Rabchinskii ◽  
Victor V. Sysoev ◽  
Sergei A. Ryzhkov ◽  
Ilya A. Eliseyev ◽  
Dina Yu. Stolyarova ◽  
...  
Keyword(s):  
Smart Materials ◽  
Chemical Properties ◽  
Research Community ◽  
Physical And Chemical Properties ◽  
Facile Synthesis ◽  
The Core ◽  
Physical And Chemical ◽  
Significant Attention ◽  
And Chemical Properties

Graphene derivatization to either engineer its physical and chemical properties or overcome the problem of the facile synthesis of nanographenes is a subject of significant attention in the nanomaterials research community. In this paper, we propose a facile and scalable method for the synthesis of thiolated graphene via a two-step liquid-phase treatment of graphene oxide (GO). Employing the core-level methods, the introduction of up to 5.1 at.% of thiols is indicated with the simultaneous rise of the C/O ratio to 16.8. The crumpling of the graphene layer upon thiolation without its perforation is pointed out by microscopic and Raman studies. The conductance of thiolated graphene is revealed to be driven by the Mott hopping mechanism with the sheet resistance values of 2.15 kΩ/sq and dependable on the environment. The preliminary results on the chemiresistive effect of these films upon exposure to ethanol vapors in the mix with dry and humid air are shown. Finally, the work function value and valence band structure of thiolated graphene are analyzed. Taken together, the developed method and findings of the morphology and physics of the thiolated graphene guide the further application of this derivative in energy storage, sensing devices, and smart materials.

Hydrothermal Properties of Geologic Fluids

Elements ◽  
2020 ◽  
Vol 16 (6) ◽  
pp. 375-380 ◽  
Author(s):  
Matthew Steele-MacInnis ◽  
Craig E. Manning
Keyword(s):  
Chemical Properties ◽  
Geochemical Evolution ◽  
Physical And Chemical Properties ◽  
Fluid Circulation ◽  
Hydrothermal Conditions ◽  
The Earth ◽  
Geologic Setting ◽  
Multicomponent Solutions ◽  
Physical And Chemical ◽  
And Chemical Properties

Aqueous fluids are critical agents in the geochemical evolution of Earth’s interior. Fluid circulation and fluid–rock reactions in the Earth take place at temperatures ranging from ambient to magmatic, at pressures from ambient to extreme, and involve fluids that range from nearly pure H2O through to complex, multicomponent solutions. Consequently, the physical and chemical properties of hydrothermal fluids vary widely as functions of geologic setting; this variation strongly impacts fluid-driven processes. This issue will focus on the nature of geologic fluids at hydrothermal conditions and how such fluids affect geologic processes in some major settings.

Nd-Sr Isotope and REE Evidence for the Long-Term Stability of HLW Glass Products and Trace Metal Migration in a Salt Repository: Corroding Basaltic Dykes in Evaporites as Natural Analogues

1997 ◽  
Vol 506 ◽  
Author(s):  
M. Steinmann ◽  
P. Stille ◽  
K. Mengel ◽  
M. Siemann ◽  
W. Bernotat
Keyword(s):  
Chemical Properties ◽  
Physical And Chemical Properties ◽  
Sr Isotope ◽  
Long Term Stability ◽  
Natural Analogues ◽  
Metal Migration ◽  
High Level ◽  
Physical And Chemical ◽  
And Chemical Properties

Basaltic dykes in salt rocks can be used in two different ways as natural analogues for high level radioactive waste (HLW) in a salt repository: In the first approach the basalts serve as analogues for the corrosion behavior of HiLW glass products during millions of years because of many similarities in their physical and chemical properties.

scholarly journals Synthesis, physical and chemical properties of 5-(phenoxymethylene)-4-R-1,2,4-triazol-3-thiones derivatives, which contain alkyl- and arylnitrile fragments

2018 ◽  
pp. 52-58
Author(s):  
Yu. M. Kucheryavyi ◽  
A. G. Kaplaushenko
Keyword(s):  
Chemical Properties ◽  
Biologically Active ◽  
Physical And Chemical Properties ◽  
Chemical Methods ◽  
The Core ◽  
Physical And Chemical ◽  
Tumor Drugs ◽  
Derivatives Of ◽  
Active Substances ◽  
And Chemical Properties

Ukraine takes the second place in Europe for the dissemination of cancer. Ukrainian pharmaceutical market practically doesn’t have domestic anti-tumor drugs. That’s why, many scientists of pharmaceutical industry work in this direction.  The searching of biologically active substances among derivatives of 1,2,4-triazole is actually for today. Anastrozole and Letrozole are enough known like anti-tumor drugs which contain in their structures the core of 1,2,4-triazole and nitrile groups. The aim of our work is purposeful synthesis a number of new highly effective compounds 2-((5-(phenoxymethylene)-4-R-4H-1,2,4-triazole-3-yl)thio)acetonitriles and 2-, 3-, 4-(((5-(phenoxymethylene)-4-R-4H-1,2,4-triazole-3-yl)thio)methyl)benzo-nitriles, research of its physical and chemical properties. The 5-(phenoxymethylene)-4-R-1,2,4-triazole-3-thiones, which contain alkyl- and arylnitrile groups has been synthesized and its effective methods obtaining have been set. The structure of synthesized compounds has been confirmed by modern complex of physical and chemical methods of analysis. The synthesized compounds with alkyl- and arylnitrile functional groups will become the basis for further modification of the structure to increase results or expand the range of the biological activity.

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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