Abstract: A supercapacitor including a gel electrolyte and two electrodes having a substrate, date stone activated carbon, a conductive carbon compound different from the date stone activated carbon, and a binding compound. A mixture of the date stone activated carbon, the conductive carbon compound, and the binding compound partially coats a surface of the substrate. The two electrodes are assembled in a symmetrical layered configuration with the surfaces coated with the mixture facing each other. The gel electrolyte is present between the surfaces coated with the mixture to form the supercapacitor. The gel electrolyte is a mixture of H2SO4, polyvinyl alcohol, and anthraquinone. Particles of the date stone activated carbon have a nanosheet morphology, and the nanosheets are stacked on top of each other to form a hierarchical structure.

Abstract: The present disclosure describes an autonomous warehouse package delivery system. The system includes a warehouse, a plurality of unmanned ground vehicles (UGV), a plurality of UAVs, and a plurality of servers. The warehouse includes a U-shaped conveyor belt, a plurality of shelving units, a plurality of package stacks, a first plurality of robots, and a second plurality of robots. Each UGV autonomously pick-ups a package from a shelf, navigates to the UAV landing pads, and places the package on the UAV landing pad. The plurality of UAVs travel to the UAV landing pad and pick up a package, autonomously fly to a package delivery address and release the package at the package delivery address. A real-time data distribution middleware network is connected to the U-shaped conveyor belt, the first plurality of robots, the second plurality of robots, the plurality of UGVs, the plurality of UAVs and a plurality of servers.

Abstract: A method of forming an electrode including dissolving a copper salt and benzene-1,3,5-tricarboxylate in a solvent and heating to a temperature of 60° C. to 100° C. to form a framework. Further, the method includes mixing a zinc salt and the framework to form a zinc doped framework and heating the zinc doped framework to a temperature of 300° C. to 600° C. under air to form ZnCuO nanoparticles. Furthermore, the method includes mixing the ZnCuO nanoparticles, a binding compound, and a conductive carbon compound in a solvent to form a suspension. Moreover, the method includes coating a substrate with the suspension and drying to form the electrode and the ZnCuO nanoparticles have an oval shape with an average size of 50 nm to 200 nm.

Abstract: An electrode including a substrate, a binding compound, and a composite. The composite includes jute-activated carbon and a nickel-cobalt-layered double hydroxide (NiCoLDH). Particles of the NiCoLDH are in the form of nanoflowers with an average size of 5-15 ?m. The nanoflowers comprise nanosheets with an average thickness of 5-20 nm. The particles of the jute-activated carbon are in the form of interconnected nanosheets, which form a porous carbon framework. The porous carbon framework connects the nanoflowers, thereby forming an interconnected structure in the composite. A mixture of the composite and the binding compound is coated on the surface of the substrate. The electrode can be included in supercapacitors and power banks.

Abstract: Aspects of the present disclosure are directed to a method for synthesizing carbon quantum dots. The method includes reacting a mixture of a fruit waste material and deionized water hydrothermally in an autoclave at a reaction temperature in a range of 150° C. to 250° C. to form a carbon quantum dot containing suspension, centrifuging the carbon quantum dot containing suspension to separate the carbon quantum dots from a hydrochar, and filtering the carbon quantum dot containing suspension to obtain the carbon quantum dots. The carbon quantum dots have a size ranging from 2 to 10 nm. The carbon quantum dots have a Stokes shift of at least 150 nm at an excitation wavelength of 360 nm or lower.

Abstract: A method for ammonia (NH3) decomposition to hydrogen (H2) and nitrogen (N2) includes introducing and passing a H2-containing feed gas stream into a reactor containing an industrial waste-based nickel (Ni-SMR) catalyst at a temperature of 500 to 900° C. to form a reduced Ni-SMR catalyst; introducing and passing an NH3-containing feed gas stream through the reactor in contact with the reduced Ni-SMR catalyst at a temperature of 100 to 1000° C. thereby converting at least a portion of the NH3 to H2 and regenerating the Ni-SMR catalyst particles to form a regenerated Ni-SMR catalyst, and producing a residue gas stream leaving the reactor; and separating the H2 from the residue gas stream to generate a H2-containing product gas stream.

Abstract: A method includes preparing an alkyl-modified graphene oxide, injecting the modified graphene oxide into a well, and inhibiting acid-induced corrosion of a steel surface in the well with the modified graphene oxide. A composition includes an alkyl-modified graphene oxide having one or more alkyl functional group covalently bonded to a graphene core through an oxygen-containing linking group. A method of preparing modified graphene oxide includes mixing graphite powder with an oxidant to provide a mixture, adding the mixture to an acid solution including H2SO4, H3PO4, or a combination thereof to provide graphene oxide, and reacting the graphene oxide with an alkyl halide by nucleophilic substitution to provide the alkyl-modified graphene oxide.

Abstract: A method for producing hydrogen gas is disclosed. The method includes providing kerogen; providing hydrogen; introducing the kerogen and hydrogen into a reaction chamber wherein the reaction chamber is operated at an operating temperature between about 455° C. and 510° C.; and removing a gas stream comprising hydrogen.

Abstract: A microgrid system includes a synchronous generator configured to convert mechanical power into electric power, an energy storage system configured to store and supply electric power, a controller configured to control operation of the energy storage system; and a point of common coupling bus connecting the synchronous generator and the battery energy storage system, wherein a controller parameter of the controller is determined based on a level of a disturbance using a trained artificial neural network in response to occurrence of the disturbance in the synchronous generator.

Abstract: A method of forming an electrode including dissolving a copper salt and benzene-1,3,5-tricarboxylate in a solvent and heating to a temperature of 60° C. to 100° C. to form a framework. Further, the method includes mixing a zinc salt and the framework to form a zinc doped framework and heating the zinc doped framework to a temperature of 300° C. to 600° C. under air to form ZnCuO nanoparticles. Furthermore, the method includes mixing the ZnCuO nanoparticles, a binding compound, and a conductive carbon compound in a solvent to form a suspension. Moreover, the method includes coating a substrate with the suspension and drying to form the electrode and the ZnCuO nanoparticles have an oval shape with an average size of 50 nm to 200 nm.

Abstract: A method for direct methane (CH4) oxidation (DMTM) to methanol (CH3OH) includes passing an oxygen-containing feed gas stream into a reactor containing a copper-loaded mordenite zeolite (Cu-MOR) catalyst particles such that the oxygen-containing feed gas stream is in contact with the Cu-MOR catalyst particles, at a temperature of 100 to 500° C., to form an oxidized Cu-MOR catalyst. The method further includes displacing oxygen in the reactor by nitrogen purging, and further passing a CH4-containing feed gas stream through the reactor in contact with the oxidized Cu-MOR catalyst at a temperature of 50 to 200° C., thereby converting at least a portion of the CH4 to CH3OH. The method further includes regenerating the Cu-MOR catalyst particles to form a regenerated Cu-MOR catalyst. The CH3OH is adsorbed on surfaces and pores of the regenerated Cu-MOR catalyst.

Abstract: A method for syngas production includes contacting an electrocatalytic working electrode with a gaseous electrolytic solution including carbon dioxide in a cell with a reference electrode and a counter electrode, applying a potential to the cell during the contacting, and forming a gaseous syngas product by electrocatalytically reducing the carbon dioxide in the gaseous electrolytic solution without forming any liquid syngas product. The electrocatalytic working electrode includes an electrocatalytic material on a conductive carbon paper. The electrocatalytic material includes a zeolitic imidazolate framework-8 (ZIF-8) and silver in an amount of 5 to 10 percent by weight of the electrocatalytic material. The ZIF-8 and silver are in a layer of particles. The particles are in the form of one or more polyhedrons and the one or more polyhedrons have a longest dimension with an average length of 0.1 to 20 ?m.

Abstract: A method of making a composite, including mixing ZnO nanoparticles (NPs), Mg particles, and Zr particles under an inert atmosphere to form a powder mixture, compacting the powder mixture at a pressure of 500-600 MPa for at least 1 minute to form a compacted mixture, and sintering the compacted mixture at a temperature of 400-500° C. for at least 1 hour to form the composite. The composite includes 1-10 wt. % of the ZnO NPs and 0.1-5 wt. % of the Zr particles, based on a total weight of the composite, the Zr particles and the ZnO NPs are homogeneously dispersed in a matrix of the Mg particles in the composite, the Mg particles have an average grain size of 5-10 ?m in the composite, and the Zr particles and the ZnO NPs separately form aggregates at grain boundaries of the Mg particles in the composite.

Abstract: A predictive current control method for a six-phase induction motor (6PIM) includes initializing a six-phase inverter at a present switching state, measuring a stator current and a rotor speed, transforming the stator current to ?? and xy orthogonal frame, estimating a pair of currents in ?? and xy frame based upon the measured and an estimated rotor speed, and calculating a future stator current for a future control sample of the inverter. The method further includes selecting four voltage vectors (VV) from ?? and xy frames, implementing a cost function to calculate an error between the predicted future and a reference stator current, calculating a plurality of cost function results of each of the four VV, identifying a future VV that provides a minimum cost function results for the future control sample, saving the future VV to be used as an input to the lookup table for the next control sample and controlling the 6PIM by applying the future control sample as the switching state of the inverter.

Abstract: A method of cracking a hydrocarbon including contacting the hydrocarbon with a catalyst; where on the contacting, the hydrocarbon is cracked into a plurality of compounds, each having a smaller number of carbon atoms than the hydrocarbon. The catalyst includes an aluminosilicate zeolite, the aluminosilicate zeolite includes a weight ratio of SiO2 to Al2O3 of 10-200:1. Particles of the aluminosilicate zeolite have a flake shape with an average longest dimension of 10 nanometers (nm) to 50 nm and the flakes are stacked on top of one another.

Abstract: A method of making an electrocatalyst, including dissolving a copper salt and an aromatic compound in a solvent to form a first mixture, heating the first mixture to a temperature of 90-120° C. for 1-20 hours (h) to form a copper complex, heating the copper complex under a nitrogen atmosphere at a temperature of 500-1,000° C. to form a nanocomposite; and coating a layer of the nanocomposite on a substrate to form the electrocatalyst. The nanocomposite contains copper nanoparticles (NPs) and nitrogen-doped carbon nanosheets. The copper NPs are uniformly dispersed on a surface of the nitrogen-doped carbon nanosheets, the nitrogen-doped carbon nanosheets have an average thickness of 0.1-10 nm, and the copper NPs are spherical and have an average diameter of 2-10 nm.

Abstract: A method, system, and drilling fluid for treating a wellbore for filter cake removal, including providing the drilling fluid having thermochemical reagents that are encapsulated and acid-generating material that is encapsulated into a wellbore in a subterranean formation to attack filter cake in the wellbore, and attacking the filter cake via the drilling fluid.

Abstract: A method and system for mitigating low-frequency oscillations of a power system network (PSN). The method includes receiving multiple data sets from the PSN, comprising values of terminal voltage, a real power, and a reactive power. The method further employs the multiple data sets to a fuzzy c-means clustering technique, a deep learning technique and a whale optimization algorithm to generate a pair of parameter values for a power system stabilizer controlling a steady-state of the power system network.

Abstract: The present disclosure provides an asymmetric supercapacitor that includes a negative electrode, a positive electrode, an ionic liquid electrolyte, and a separator. The negative electrode includes a tomato leaf activated carbon having a hierarchical porosity disposed on a first carbon cloth. The positive electrode includes a polyaniline disposed on a second carbon cloth; an ionic liquid electrolyte. The separator is located between the positive electrode and the negative electrode, and the ionic liquid electrolyte is present in and on the separator. The supercapacitor may be implemented in a heart pulse rate monitoring system.

Abstract: A method of generating hydrogen including applying a potential of greater than 0 to 2.0 V to an electrochemical cell that is partially submerged in an aqueous solution. On applying the potential, water in the aqueous solution is reduced, and thereby forms hydrogen. The electrochemical cell includes an electrocatalyst and a counter electrode. The electrocatalyst includes a substrate, WO3?x nanosheets, and CdS1?y nanospheres, in which, x is from greater than 0 to less than 3 and y is from greater than 0 to less than 1. The CdS1?y nanospheres are dispersed on the WO3?x nanosheets to form a nanocomposite, which is dispersed on a surface of the substrate. The WO3?x nanosheets have an average length of 600-800 nanometers (nm) and an average width of 300-500 nm, and the CdS1?y nanospheres have an average diameter of 10-50 nm.