Range Of Potential Values Research Articles

Probabilistic CDF-based load forecasting model in a power distribution system

The study searches for a probabilistic forecasting model for electric power demand based on the correlation between weather temperature and electric power demand using hourly time series data spanning a year. The model is based on the temperature and power demand data's cumulative probability distribution functions or CDFs. In probabilistic forecasting, a range of potential values and their associated probabilities are predicted in addition to a single value for a given range. The qualities of CDF modeling allow it to cover these uncertainties. For scenario 1, case 2, and case 3, the mean absolute percentage error (MAPE)-based forecasting accuracy for the hourly load demand is 3.93, 4.64, and 2.56, respectively. The Gaussian distribution-based CDFs' capacity to forecast outside of the present data range is an extra advantage. The world's electric power networks are growing increasingly intricate and unpredictable through the integration of several distributed energy resources (DERs) and cutting-edge technology from renewable energy resources (RERs). Other variables, such as variations in weather patterns, shifts in the status of the economy, or adjustments to energy policies, can also add to uncertainty and not be foreseen. A body of literature demonstrates a shortage of research on LTLF and general-purpose forecasting methods. The proposed approach is flexible and might establish a standard for many different forecasting tasks. The proposed method is intended to be a flexible strategy that may be used for different utilities with varying time horizons.

A branching algorithm to reduce computational time of batch models: Application for blast analyses

Numerical analysis is increasingly used for batch modelling runs, with each individual model possessing a unique combination of input parameters sampled from a range of potential values. Whilst such an approach can help to develop a comprehensive understanding of the inherent unpredictability and variability of explosive events, or populate training/validation data sets for machine learning approaches, the associated computational expense is relatively high. Furthermore, any given model may share a number of common solution steps with other models in the batch, and simulating all models from birth to termination may result in large amounts of repetition. This paper presents a new branching algorithm that ensures calculation steps are only computed once by identifying when the parameter fields of each model in the batch becomes unique. This enables informed data mapping to take place, leading to a reduction in the required computation time. The branching algorithm is explained using a conceptual walk-through for a batch of 9 models, featuring a blast load acting on a structural panel in 2D. By eliminating repeat steps, approximately 50% of the run time can be saved. This is followed by the development and use of the algorithm in 3D for a practical application involving 20 complex containment structure models. In this instance, a ∼20% reduction in computational costs is achieved.

Scheduling and Routing for a Bus-Based Evacuation with a Constant Evacuee Arrival Rate

This paper introduces a variant of the vehicle routing problem adapted for bus-based, regional evacuation planning, where evacuees arrive at predetermined pickup locations at constant, location-specific rates. This arrival process more realistically portrays evacuee arrival behavior, presenting an important distinction from the current transit-based evacuation literature. In this problem, capacity-constrained buses are routed, potentially multiple times, to transport all evacuees to a depot/shelter such that the last pickup, and the end of the arrival process, occurs at a location-specific time, determined by risk considerations. The problem seeks to minimize the total waiting time at these locations (total exposure) and exploits efficiencies by allowing service choice. The structural properties of this problem guide the choice for two important strategic parameters: the maximum number of pickups allowed on each location and the fleet size. It is shown that, depending on the problem instance, increasing the maximum number of pickups may reduce both the fleet size requirement and the total exposure and that, past a certain threshold, there exists a maximum number of pickups (or a range of potential values, if the problem cannot be solved to optimality) that guarantees an efficient usage of the available fleet and equitable reductions in exposure across pickup locations.

Electrode/Electrolyte Interface with Various Redox Couples

Typical electrostatic attraction of ions is at the origin of capacitance, however, some faradaic reactions may occur at electrode/electrolyte interface called pseudocapacitive phenomena. Such effects can be initiated from electrode but also from solutions with electroactive species (iodides, bromides, vanadium compounds, di-hydroxybenzenes etc.). Redox reactions are strongly affected by thermodynamics; Pourbaix diagrams indicate range of potential values where faradaic reactions take place. In typical two-electrode capacitor positive and negative electrode quite often operate not equally. One electrode can work in the very narrow range of potentials, e.g. iodides, bromides, di-hydroxybenzenes (0.1-0.4V) giving very high capacitance values (>1000 F/g) whereas the second one operates in the wide voltage limit but supplying moderate capacitance (ca. 100 F/g). Unfortunately electrode with smaller capacitance will affect a total capacitor performance. Selection of two various and well matched pseudocapacitive materials enables to optimize system. Asymmetric configuration with two different redox couples offers interesting capacitor performance with good cycling.A few examples of pseudocapacitive phenomena originated from electroactive species present in electrolyte will be shown. Reactions with cerium-based autocatalytic redox shuttle for brominated species oxidizing malonic acid will be also presented as example of oscillating systems. They can serve as great source of pseudocapacitance and may significantly enhance total capacitance of the system. Detailed physicochemical and electrochemical characterization of electrode materials supported by modelling will reflect the role of texture, structure, conductivity of materials as well as concentration of species in electrolytic solutions on capacitor performance. Acknowledgements The authors would like to acknowledge a financial support from Swiss-Polish project INGEC.

Electrochemical reduction of oxygen catalyzed by Pseudomonas aeruginosa

Pseudomonas aeruginosa has already been shown to catalyze oxidation processes in the anode compartment of a microbial fuel cell. The present study focuses on the reverse capacity of the bacterium, i.e. reduction catalysis. Here we show that P. aeruginosa is able to catalyze the electrochemical reduction of oxygen. The use of cyclic voltammetry showed that, for a given range of potential values, the current generated in the presence of bacteria could reach up to four times the current obtained without bacteria. The adhesion of bacteria to the working electrode was necessary for the catalysis to be observed but was not sufficient. The electron transfer between the working electrode and the bacteria did not involve mediator metabolites like phenazines. The transfer was by direct contact. The catalysis required a certain contact duration between electrodes and live bacteria but after this delay, the metabolic activity of cells was no longer necessary. Membrane-bound proteins, like catalase, may be involved. Various strains of P. aeruginosa, including clinical isolates, were tested and all of them, even catalase-defective mutants, presented the same catalytic property. P. aeruginosa offers a new model for the analysis of reduction catalysis and the protocol designed here may provide a basis for developing an interesting tool in the field of bacterial adhesion.

Organic Geochemical Properties of Marine Oligocene Unit in the Malatya Basin, East Anatolia, Turkey

Organic geochemical properties of the Oligocene unit in the Malatya Basin: Darende-Hekimhan section's TOC and genetic potential values range from 0.06 to 13.94 wt% and 110 to 94,490 ppm. Low total organic carbon (TOC) and genetic potential (GP) values indicate that the Oligocene unit has no source rock potential, except Darende-Hekimhan section. Organic matter type of the sequences is type II, indicating marine origin; however, Darende-Hekimhan section samples show that Type I, indicate lacustrine origin from HI-OI diagram, having low Tmax values (between 345°C and 419°C). Oligocene sequences are able to have mature source rock potential in the deeper part of the basin.

Geobacter species enhances pit depth on 304L stainless steel in a medium lacking with electron donor

Geobacter sulfurreducens bacteria increased the open circuit potential of 304L stainless steel by around 320 mV in only a few hours after inoculation. This represents a significant increase in the corrosion risk. In contrast, the oxidation of acetate, which is catalysed by well-established biofilms, shifted the pitting potential towards positive values. In acetate-lacking media, pitting occurred with and without bacteria in the same range of potential values, but the presence of bacteria drastically increased the size of pits. AFM showed pits more than 10 times broader and deeper due to the presence of bacteria. In the absence of acetate, the masking effect due to acetate oxidation disappeared and the full corrosive effect of the biofilm was revealed. This also fully explains why pitting was predominantly observed close to surface areas where bacterial settlement was the densest.

Dinuclear palladium(ii) compounds with bridging cyclometalated phosphines. Synthesis, crystal structure and electrochemical study

The structural characterization of bis-cyclometalated palladium(II) compounds of formula Pd2[(micro-(C6X4)PPh2]2(micro-O2CR)2 [X = H, R = CH3 (3), CF3 (4), C(CH3)3 (5) and C6F5 (6); X = F, R = CH3 (7) and CF3 (8)], has confirmed its paddle wheel structure with two palladium atoms bridged by two acetates and two metalated phosphines in a head-to-tail arrangement. The Pd...Pd distances are in the range 2.6779(16)-2.7229(8) A. Under cyclic voltammetric conditions, compounds 3-6, in CH2Cl2 solution, were found to undergo a reversible oxidation peak in the range of potential values 0.84-1.25 V. A second partially-reversible oxidation is observed at more positive potentials (1.37-1.55 V). For compounds 3-5 in the presence of chlorides, the first oxidation becomes a two-electron process presumably leading to a neutral [Pd(III)-Pd(III)] species with a metal-metal bond.

Apparent Activation Energy of the Anodic Dissolution of Nickel in Sulfuric Acid Solutions in the Presence of Cl–and CNS–Ions

Apparent activation energies W of the anodic dissolution of nickel in 0.5 M H2SO4 are determined with the use of temperature-kinetic method at certain assumptions in a wide range of potential values E. The effect of the nature of anion-activator on the character of the W = f(E) dependence is revealed. The data obtained are interpreted in terms of the concept of hard and soft acids and bases.

Social Psychological Models of Choice Behavior and Drivers' Left Turns

The authors reanalyzed data from a simulated left-turn experiment (P. A. Hancock, J. K. Caird, S. Shekhar, & M. Vercruyssen, 1991) to test the adequacy of the nonlinear Gray-Tallman satisfaction balance model of choice behavior (L. N. Gray & I. Tallman, 1984) in predicting left turns. Participants (Hancock et al., 1991) were 40 experienced U.S. drivers who were exposed to simulated oncoming traffic; the size of the vehicle (motorcycle, compact vehicle, full-sized vehicle, delivery truck), its speed (10-70 mph, or 16-112 kmph), and the intervehicle time gap (3-9 s) varied. Hancock et al. (1991) measured (a) the likelihood of a left turn and (b) the occurrence of a collision. The probability of a left turn was greater for larger intervehicle time gaps and for oncoming smaller vehicles traveling at higher speeds. The Gray-Tallman (1984) model explained 69% of the variation in turning versus 57% for a linear regression model. In making decisions people tend to treat the values and costs affecting choices in a multiplicative, rather than linear, fashion. The Gray-Tallman model also has the potential for incorporating, both theoretically and mathematically, an unlimited range of potential values and costs that may influence left turn decisions.

Ionic Diffusion Through Unblended PVC Membranes

Abstract This work deals with the study of the diffusion of Cl− ion through pure unblended polyvinylchloride (PVC) membranes of different thickness. Several PVC -tetrahydrofuran ratios and also different internal diameter glass disks have been used to change the thickness of the membrane. A chloride ion selective electrode also constructed in the laboratory is used as the detector. The electrode behaviour was studied by running up a calibration graph prior to membrane positioning. A mean slope of 57 ±1 mV/log.C at 28.0 ± 0.5 °C was obtained and the range of potential values were then known. The detector was very well washed and immediately a membrane was placed directly on its surface and assembled to a rotating disk electrode in order to get a diffusion cell. The receiving compartment in this system has a negligible volume. Therefore, the response of the chloride ion selective electrode is directly proportional to the flux of material through the membrane rather than to the receiving compartment concentr...

Proof-number search

Proof-number search (pn-search) is designed for finding the game-theoretical value in game trees. It is based on ideas derived from conspiracy-number search and its variants, such as applied cn-search and αβ-cn search. While in cn-search the purpose is to continue searching until it is unlikely that the minimax value of the root will change, pn-search aims at proving the true value of the root. Therefore, pn-search does not consider interim minimax values. Pn-search selects the next node to be expanded using two criteria: the potential range of subtree values and the number of nodes which must conspire to prove or disprove that range of potential values. These two criteria enable pn-search to treat efficiently game trees with a non-uniform branching factor. It is shown that in non-uniform trees pn-search outperforms other types of search, such as α-β iterative-deepening search, even when enhanced with transposition tables, move ordering for the full principal variation, etc. Pn-search has been used to establish the game-theoretical values of Connect-Four, Qubic, and Go-Moku. There pn-search was able to find a forced win for the player to move first. The experiments described here are in the domain of Awari, a game which has not yet been solved. The experiments are repeatable for other games with a non-uniform branching factor. This article describes the underlying principles of pn-search, presents an appropriate implementation, and provides an analysis of its strengths and weaknesses.