Surface area

The presence of ammonium in drinking water poses a significant global challenge, demanding strategies that safeguard both public health and the environment. This study investigates the adsorption potential of AC-GCB biochar, obtained by pyrolyzing green coffee extracted bioactive compounds at 400ºC, for ammonium removal from groundwater.

11p viamancio 04-06-2024 1 0   Download

Nano technology demystified is for anyone interested in the nanoscale world who wants to learn more about this exciting new area. It can also be used by home-schooled students, tutored students, and those people wanting to change careers. The material is presented in an easy-to-follow way and can best be understood when read from beginning to end. However, if you want more information on specific topics—for example, quantum dots, nanoelectronics, lab-on-a-chip, and so on—or you want to check out only nanotechnology business happenings, those chapters can be reviewed individually.

362p zizaybay1103 29-05-2024 6 2   Download

Part 1 of ebook "Elastic solutions for soil and rock mechanics" provides readers with contents including: Chapter 1 - Fundamental definitions and relationships; Chapter 2 - Basic solutions for concentrated loading; Chapter 3 - Distributed loads on the surface of a semi-infinite mass; Chapter 4 - Distributed loading beneath the surface of a semi-infinite hass; Chapter 5 - Surface loading of a finite layer underlain by a rigid base; Chapter 6 - Surface loading of multi-layer systems; Chapter 7 - Rigid loaded areas;...

204p giangdongdinh 28-05-2024 3 2   Download

Harvesting microalgae by centrifugation and filtration is very costly, affecting technical and economical feasibility of downstream processing of algal biomas to bioproducts. Flocculation is a potential technique for recovery of algae biomass. Particularly, flocculation using magnetic nanoparticles offers high separation efficiency due to their high surface area and magnetic properties. I

10p dianmotminh02 03-05-2024 2 1   Download

According to the batch experiments, the adsorption isotherms and the adsorption kinetics for these mesoporous materials are well fitted with the nonlinear Langmuir model and the nonlinear pseudo-second-order model, respectively. Among them, CuFe2O4 powder showed the best phosphate adsorption performance with the maximum P adsorption capacity of 27.49 mgP g-1 , which can be assigned to the highest surface area and the high pH value at its point of zero charge.

7p dianmotminh02 03-05-2024 6 1   Download

This study presents some research results on the relationship between the geological environment of the surface layer and the level of modern tectonic activity in the sea waters of the Hoi An - Cua Dai area based on the interpretation of high-resolution shallow seismic data combined with the surface sediments’ grainsize analysis and other available data sources. The results show that the surface geological environment in the coastal waters North of the Thu Bon river fault is influenced by modern tectonic activities, believed to be a part of causing geological catastrophic events.

10p dianmotminh02 03-05-2024 3 1   Download

In this work, Al-doped ZnO and Fe-doped ZnO nanoparticles have been synthesized through the coprecipitationannealing method to create new and safer UV filters for sunscreen. The effects of metal doping on phase composition, crystal structure, surface morphology, specific surface area, and elemental composition were characterized by X-ray diffraction, Raman spectroscopy, field emission electron scanning microscopy, nitrogen adsorption-desorption experiments and energy-dispersive X-ray spectroscopy, respectively.

8p dianmotminh02 03-05-2024 2 1   Download

The study results show inter-relationships and transformations of the three indicators in the research context, where urban land temperature and Urban Heat Island (UHI) are raised by built-up areas and in contrast, reduced by vegetated areas. As a result, urban green space would be a driver to mitigate the harmful impact of the "heat island" effect in urban areas. Aim to strengthen concentrated green areas and vegetation in land areas that are less favorable for construction.

11p dianmotminh02 03-05-2024 4 1   Download

Bio-nanomaterials have been gaining increased attention recently due to their special, nano-specific properties such as their high specific area compared to their bulk materials and their environmentally friendly, and renewable properties. Overall, this review discusses recent advances of two nanomaterials derived from bio-sources, which are nanocellulose and carbon-based nanomaterials in the application of electrochemical energy storage devices, specifically batteries and supercapacitors.

12p dianmotminh02 03-05-2024 4 1   Download

This paper aims to provide information about the fractions of cadmium (Cd) and its distribution in surface sediment collected from bivalves harvesting areas in Binh Thuan province (Tuy Phong, Phan Thiet, Lagi). For this purpose, the sediment samples were collected monthly along with these areas in 2015–2016. To analyze the fractions of Cd, a five-step Tessier (1979) sequential extraction process was used, including Fraction 1 (Exchangeable), Fraction 2 (Bound to carbonate), Fraction 3 (Bound to iron-manganese oxide), Fraction 4 (Bound to organic compounds), and Fraction 5 (Residual).

10p dianmotminh02 03-05-2024 5 1   Download

This paper reported the synthesis of MOF based on Cu and H3BTC by potentiodynamic method, with emphasis on the effect of the solvent’s nature on the morphology, structure and specific surface area of the obtained material. The CO2 adsorption performance of the obtained MOF was also assessed.

10p dianmotminh02 03-05-2024 2 1   Download

Estuary sediments contain toxic heavy metals which can pollute coastal wetlands. Ba Che river estuary is a coastal wetland with an area of 2,844 ha, which is affected by wastes in Ba Che river water and aquacultures. In this study, the accumulation of heavy metals in the Ba Che river estuary was assessed based on the enrichment factor (EF), the geo-accumulation index (Igeo), and the ecological risk index (RI).

9p dianmotminh02 03-05-2024 5 1   Download

The 781m twin tunnel in line No 1 Ben Thanh – Suoi Tien was the first tunnels constructed by Earth Pressure Balance Tunnel Boring Machine (EPB TBM) in the urban area in Ho Chi Minh City, Vietnam. Field data on a surface settlement at three sections, measured during the construction period from May 2017 to June 2018, are used for back analyses on the development of surface settlement with the corresponding advancement of the EPB TBM.

8p viohoyo 25-04-2024 3 1   Download

The purpose of the study "Monitoring surface water bodies changes from sentinel-2A imagery with modified normalized difference water index: Application in Dalat, Lam Dong, Viet Nam" is to identify surface water body changes using Sentinel-2 MSI (Multi-Spectral Instrument) data, one of the latest types of remote sensing satellite data. The results of the research show that by using Sentinel-2 MSI imagery, MNDWI (Modified Normalized Water Index) is the appropriate parameter to detect surface water areas in the studied area, with an overall accuracy > 0.92 and Kappa coefficient > 0.84.

10p tukhauquantuong1011 22-04-2024 4 2   Download

In the study "WebGL-based visualization tool for 3D geological structures in shallow subsurface in urban areas" to provide 3D geological information in urban areas with an easy-to-understand style on the Web, we have developed a WebGL-based visualization tool for 3D geological maps that consists of shape data of geological boundary surfaces and 3D representations of borehole data.

5p tukhauquantuong1011 22-04-2024 3 2   Download

The research "Detection of land surface temperature change in coal mining area using remote sensing and GIS techniques - A case study in Quang Ninh province, Vietnam" explores Land Surface Temperature (LST), which represents the energy exchange between the land surface and the atmosphere, as well as with the biosphere. Variations in surface temperature can lead to the formation of heat islands characterized by higher temperatures compared to surrounding areas.

9p tukhauquantuong1011 22-04-2024 3 2   Download

The study "Application of remote sensing and GIS to establish surface temperature map of Phu Tho province" used Landsat 8 images to calculate the surface temperature of Phu Tho province. The data used in the study are Landsat 8 images combined with geographical data of the area. Calculation results of Phu Tho province’s surface temperature range from 26.79-46.32°C. Places with high temperatures are concentrated in the city. Viet Tri is a place with high population density and rapid urbanization. The temperature in the high mountains is relatively cool.

6p tukhauquantuong1011 22-04-2024 4 2   Download

International conference GIS-Ideas 2023: Geospatial integrated technologies for natural hazards and environmental problems is a collection of articles about: Determination of the optimal density contrast in the seafloor depth inversion from gravity anomalies using the Gravity-Geologic method on the central East Sea; Impact of urbanization on seawater quality in Quang Ninh province; Forecast of submarine landslides related to the reactive probability of the fault system in the Southeast Vietnam continental shelf and adjacent areas; Applying machine learning algorithms to classify forest cove...

442p tukhauquantuong1011 22-04-2024 3 2   Download

Ebook "Development of an effusive molecular beam apparatus" presents the development of an effusive molecular beam apparatus, which allows the dosing of gases, liquids, and solids in ultra-high vacuum. The apparatus is designed to adsorb precise and reproducible doses to a defined area on metal oxide samples, which is required in Temperature Programmed Desorption and other surface chemistry experiments. The design and the construction of the apparatus is described.

118p tudohanhtau1006 29-03-2024 2 1   Download

Ebook "Functional molecular silicon compounds I: Regular oxidation states" critical reviews on topics of research concerned with chemical structure and bonding. The scope of the series spans the entire Periodic Table and addresses structure and bonding issues associated with all of the elements. It also focuses attention on new and developing areas of modern structural and theoretical chemistry such as nanostructures, molecular electronics, designed molecular solids, surfaces, metal clusters and supramolecular structures.

242p tudohanhtau1006 29-03-2024 3 1   Download