Apparently mundane, amorphous nanostructures of carbon have optical properties which are as exotic their crystalline counterparts. In this work we demonstrate a simple and inexpensive mechano-chemical method to prepare bulk quantities self-passivated, dots. Like the graphene quantum dots, water soluble, dots too, exhibit excitation-dependent photoluminescence with very high yield (~40%). The origin nature luminescence in these entropy well understood terms abundant surface traps. property is...

Excitation-dependent, multicolor emission from different varieties of 0D carbon systems has attracted immense research attention. It is generally accepted that some variants exhibit excitation dependent emission, while other do not. A third variant exhibits both as well independent emission. In this work we investigate the structure, composition, steady-state emission-excitation and photoluminescence decay dynamics three distinctly - amorphous dots (aCDs), graphene quantum (GQDs)...

International trade contributes a significant role in economic development of country. A country that performs well international signifies stability. Pakistan has maintained relationships with other countries over the years. This study examined association Gross domestic product (GDP) exports, imports and openness perspective Pakistani economy from 1985 to 2023 by using Ordinary Least Square (OLS) method. Descriptive statistics, unit root test correlogram Autocorrelation Function (ACF)...

The detailed features of the design a sampling tube, such as area ratio, inside clearance, cutting edge taper angle, etc., have an important influence on disturbance caused when tube sampler is pushed into cohesive soil. Currently, most designs evolved basis empirical rules, and local good practices, developed for particular soil conditions. strain path method provides upon which importance different can be evaluated, future samplers optimized. This paper examines use Baligh's assessment...

Analytical solutions for a dislocation inside an infinite medium of matter need to be adjusted with correction terms ensure zero traction on internal free surfaces, i.e. voids or holes.The current article proposes numerical approach calculate this term screw near cylindrical hole.This method can implemented in finite also.The numeric solution is verified against analytical solution.

Incorporating heteroatoms into graphene lattice results in enhanced electrical conductivity and electrochemically active sites has significant importance developing high-performance supercapacitors. In this study, sulfur nitrogen co-doped aerogel is synthesized via hydrothermal technique followed by a simple but effective freeze-thawing ambient pressure drying process (referred to as SN-GA). The requires low-cost raw materials cost-effective equipment without the utilization of any special...

The past decade has seen a considerable improvement in the understanding of causes tube sampling disturbance, as result both comparative studies performance different methods, and development new analytical techniques. This built on pioneering work carried out 1930s 1940s, reviewed interpreted seminal works Hvorslev. Much this knowledge, old new, yet to be used widely engineering practice, UK elsewhere. paper reviews some major issues which must addressed if samples acceptable quality are...

Nitrogen-functionalized graphene quantum dots embedded in a polyaniline matrix (NGQD–PANI) are extremely promising candidates for the development of next-generation sensors and thermoelectric materials design with distinct advantage tunability electronic properties by controlled doping and/or controlling inherent disorder microstructure. While their application is increasing photovoltaics, energy storage, sensing technologies, clear understanding conduction these hybrid systems lacking....

Biopolymer microgels present many opportunities in biomedicine and tissue engineering. To understand their vivo behavior therapeutic interventions, long-term monitoring is critical, which usually achieved by incorporating fluorescent materials within the hydrogel matrix. Current research limited due to issues concerning biocompatibility instability of conventional species, also tend adversely affect bio-functionality hydrogels. Here, we introduce a microfluidic-based approach generate...

Abstract Simulation of dislocation dynamics enables researchers and scientists to explore the plastic behavior crystalline materials under loading. Analytic solutions for stress field due a linear segment near free surface are case-specific, e.g. dealing with either horizontal or vertical segment, therefore hard implement in time-dependent simulations as different segments could be differently oriented. This article presents generalized numerical framework find beneath presence segment. The...

A container yard was constructed for handling of loaded containers at Chittagong Sea Port in Bangladesh covering an area 60700 m2 over a sub-soil that included layer soft stratum clayey silt/silty clay the depths 0 to 3.5 m below grade. Thicknesses varied from 3 7 m. Ground improvement using pre-loading with prefabricated vertical drains undertaken pre-consolidate compressible sub-soils, which followed by field monitoring. It is revealed classical theories can effectively be used calculating...

Simulation of dislocation dynamics opens the opportunity for researchers and scientists to observe in-depth many plastic deformation phenomena. In 2D or 3D media, modeling physical boundary conditions accurately is one keys success (DD) simulations. The scope analytical solutions restricted applies specific configurations only. But in simulations, dislocations' shape orientation change over time thus limiting use solutions. authors this article present a mesh-based generalized numerical...

Expansive soil is prone to large volume changes (swelling and shrinking) that are directly related in moisture. So the low bearing strength high compressibility behavior of can cause severe damage subgrade. In this research enumeration by adding different types ground improvement materials like as fly ash bagasse order overcome such type damages. The California Bearing Ratio (CBR) test determine stability subgrade fly-ash separately at percentages. objective paper study combined effects Fly...

The effects of tube sampling disturbances on undrained shear characteristics reconstituted samples three coastal soils were investigated. values strength su and initial tangent modulus Ei reduced, whereas axial strain at peak deviator stress εp increased because a disturbance caused by penetration samplers. Disturbances also reduced effective σi′ pore pressure changes considerably. in soil parameters between the "in situ" "tube" depended markedly geometry samplers used to retrieve samples....

Analytical solutions for dislocations around multiple interacting free surfaces are strictly case-specific (they depend on the exact dislocation location and number geometry of voids/free surface). This is because they rely precise placement image (fictitious) dislocations, thus can end up being very complicated in their formulation. The current article presents a general numerical scheme based collocation point method. proposed method capable generating any shapes or geometries. paper also...

Abstract Plastic deformation in metals is dominated by the interactions among dislocations and other defects inside crystal. A large number of dislocation multipoles (dipoles, tripoles, quadrupoles, etc.) can form during plastic deformation. Depending on relative position orientation dislocations, between change elastoplastic properties a material. The authors this article investigate effect This performed analytically under different multipole configurations (i.e., distance active glide...

Abstract In order to simulate varying degrees of disturbance soil at the centerline a tube sampler, triaxial stress and strain path tests have been carried out on normally consolidated overconsolidated reconstituted London clay specimens. The were using an automated system capable controlling both stresses deformations imposed specimens instrumented with local axial radial mid-plane pore pressure measuring devices. Test results indicate that most pronounced effects due sampling strains in...