Linear Version Research Articles

Heat exchanger networks: A predictive control approach

This work demonstrates the development of a practical predictive control approach to regulate the outputs of a network of heat exchangers. The full nonlinear continuous-time dynamic of the network is introduced to simulate the real process. Whereas a discrete linear and simpler version of this dynamic is employed to construct the predictive controller as well as an extended Kalman estimator. The presented algorithm is a time-varying model predictive control (MPC) where the simplified model is successively linearized on-line around the current available measurements. For the closed-stability of the introduced MPC scheme, a modified method is suggested to design terminal stabilizing weights where reference tracking problem, external disturbance dynamics, as well as the proper dynamics of a heat exchanger with bypass are all considered. The on-line updated extended Kalman estimator is utilized to estimate both the process states and unknown disturbances. Thanks to the successive linearization technique, the introduced predictive controller benefits from efficient online computations and online adaptations in operation points. Nonetheless, an accurate model of the heat exchanger is essential. Compared with a typical linear MPC, it is concluded that the presented predictive algorithm produces satisfactory results for disturbance rejection and switched operation points circumstances.

GGE Biplot Analysis in Mung Bean (Vigna radiate) Genotypes for Seed Yield under Zone-IIa in Rajasthan-India

The goal of this research have become to assess and to quantify the significance of the Genotype × Environmental interplay effects on mung bean seed yield and to determine the triumphing genotype for the test environments. Sixteen mung bean genotypes have been examined at one region for over 3 years (2019, 2020 and 2021). The seed yield information for each year modified into first subjected to evaluation of variance the usage of generalized linear version. Mean seed yields of genotypes for the environments had been computed to generate a genotype and Environmental 3-way desk records for the GGE Biplot evaluation. The assessment located the presence of massive genotype x Environmental interactions for seed yield. Year effect described greater than 89.11% of the whole seed yield version. GGE Biplot analysis depicted the model sample of genotypes at three years at same region. RMG-1132, RMG-1139 and RMG-1147 established to have the capability of blending immoderate yield with strong basic overall performance, can be encouraged for manufacturing in mung bean developing regions inside the Rajasthan.

Analisis Pengaruh Kualitas Pelayanan, Brand Image dan Fasilitas terhadap Kepuasan Konsumen (Studi Kasus pada Angkutan Feeder 1 Trans Semarang)

This study aims to determine the effect of Service Quality, Brand Image and Facilities on Consumer Satisfaction using the Trans Semarang feeder 1 transportation service. The research population is all consumers of Feeder 1 Trans Semarang, a sample of 100 uses the Ferdinand formula. The method used is multiple linear regression SPSS program version 23. Multiple linear regression analysis technique Y = α + β1X1 + β2X2 + β3X3 + e. The research data variable is Consumer Satisfaction (Y) and X is Service Quality, Brand Image and Facilities. The results of the Service Quality study (X1) have no significant effect on consumer satisfaction with t count t table (3.161>1.984), with a significance value of 0.002 t table (3.930>1.984), with a significance value of 0.000 F table (120.22> 2.699) with a significance of 0.000. Calculation of the value of the Coefficient of Determination (R2) obtained Adjusted R2 of 0.783. This means that the percentage of the influence of the variable Quality of Service, Brand Image and Facilities on Customer Satisfaction is 78.3%.
 
 Keywords: Service Quality, Brand Image, Facilities and Customer Satisfaction.

Race against time: “9/11: One Day in America” and the amnesia of America’s archive

I engage in a discourse analysis of National Geographic’s docuseries “9/11: One Day in America” to argue that the series’ multi-layered effort at commemoration, geared as a long-awaited “full” telling of the 9/11 story, but committed to honoring a specific group of victims and survivors, is enabled by a disorienting temporality that raises questions about the role of national memorials and archives at this moment. Temporality is essential to the development of narrative, and with narrative a central element in the making of memory worlds, temporality cannot be underestimated as a key factor in how memories take shape. “One Day” depends on structural instantiations of time to develop its narrative as authentic memory, reflecting a paradoxical linear yet circular pattern that simultaneously authenticates and undermines the veracity of the story it tells. “One Day” transports viewers into lower Manhattan and through the events of 9/11 via a vividly illustrated timeline. But while a linear version of time in “One Day” supports the telling of survivor stories and the memorialization of the dead, the overarching effect of the timeline for viewers is circular, transporting viewers back in time to 2001 and a state of fear and confusion, forcing collective memory to exist in a repetitive temporality that excuses a turn away from history and consequences. The resulting circular mechanism for commemoration allows cultural institutions, like the ones represented in “One Day,” to emphasize the past at the expense of more critical understandings of both history and the future.

Closed formula of test length required for adaptive testing with medium probability of solution

PurposeBased on the general formula, which depends on the length and difficulty of the test, the number of respondents and the number of ability levels, this study aims to provide a closed formula for the adaptive tests with medium difficulty (probability of solution is p = 1/2) to determine the accuracy of the parameters for each item and in the case of calibrated items, determine the required test length given number of respondents.Design/methodology/approachEmpirical results have been obtained on computerized or multistage adaptive implementation. Simulation studies and classroom/experimental results show that adaptive tests can measure test subjects’ ability to the same quality over half the test length compared to linear versions. Due to the complexity of the problem, the authors discuss a closed mathematical formula: the relationship between the length of the tests, the difficulty of solving the items, the number of respondents and the levels of ability.FindingsThe authors present a closed formula that provides a lower bound for the minimum test length in the case of adaptive tests. The authors also present example calculations using the formula, based on the assessment framework of some student assessments to show the similarity between the theoretical calculations and the empirical results.Originality/valueWith this formula, we can form a connection between theoretical and simulation results.

DETERMINAN PENDAPATAN PEREMPUAN PEKERJA INFORMAL (STUDI KASUS PASAR DESA ADAT DI DESA DALUNG)

This observe ambitions to decide the impact partly and concurrently on paintings experience, age, operating capital and wide variety of own circle of relatives dependents at the profits of ladies casual employees (Case Study of Traditional Village Markets in Dalung Village). The statistics used on this observe is number one statistics, specifically via way of means of dispensing questionnaires to casual area ladies employees on the Traditional Village Market in Dalung Village. The populace used on this observe had been all casual area ladies employees withinside the Traditional Village Market of Dalung Village. The overall populace used is eighty lady employees the usage of the approach of figuring out the sample, specifically, Random Sampling. The evaluation approach used on this observe is a couple of linear regression evaluation. The consequences of statistics processing of the a couple of linear regression version located that the consequences of labor experience, age, operating capital and wide variety of own circle of relatives dependents had a vast simultaneous impact at the profits of lady casual employees on the Traditional Village Market in Dalung Village. Partially, paintings experience, operating capital and wide variety of own circle of relatives dependents have a advantageous and vast impact at the profits of lady casual employees on the Traditional Village Market in Dalung Village. The age variable partly has a terrible and vast impact at the profits of casual ladies employees on the Traditional Village Market in Dalung Village.
 keyword: Work Experience, Age, Working Capital, Number of Family Dependents, and Women Informal Workers.

Work Conflict, Workload, and Employee Performance in Retail: A Quantitative Study

This study aimed to investigate the influence of work conflict, workload, and work stress on employee performance in a small and medium-sized retail business. The research employed a quantitative approach, utilizing hypothesis testing and involving a sample of 40 employees from UMKM Moana Daily Style. The analysis utilized correlation coefficient (R), classical assumption tests, and multiple linear regression in IBM SPSS Statistics version 26. The data were collected through a questionnaire using a Likert scale, with reliability and validity tests conducted. The findings revealed significant relationships between work conflict and employee performance, workload and employee performance, as well as work stress and employee performance. These results highlight the importance of managing work conflict, workload, and work stress to enhance employee performance in the retail industry. The implications of the study suggest the need for organizations to implement strategies that promote conflict resolution, workload management, and stress reduction to optimize employee performance.
 Highlights:
 
 The study examines the impact of work conflict, workload, and work stress on employee performance in the retail industry.
 Findings indicate significant relationships between work conflict, workload, work stress, and employee performance.
 The research emphasizes the importance of managing work conflict, workload, and work stress to enhance employee performance in retail organizations.
 
 Keywords: Work Conflict, Workload, Work Stress, Employee Performance, Quantitative Study.

Issledovanie pokazateley koleblemosti, vrashchaemosti i bluzhdaemosti po pervomu priblizheniyu

Oscillation, rotation, and wandering indicators similar to Lyapunov exponents and adapted to nonlinear systems of differential equations are studied. A variety of both guaranteed and various realizable relationships between linear, spherical, radial, and ball versions of these indicators are listed, and their relationships with similar indicators of the first approximation system are considered

Forward inclusion functions for ray-tracing implicit surfaces

Using Lipschitz bounds as linear inclusion functions, we show that both Lipschitz-based ray-tracing and bottom-up inclusion functions can be used together in the same framework. We propose asymmetrical forward inclusion functions that are exact at the query point and can better encode the function’s behavior on a given interval; therefore well suited for iterative processing. We show how to derive the linear and quadratic versions of these inclusion functions either by bounding the derivatives or building bottom-up inclusion functions and combining these two. We show our results on density fields defined from point primitives with compactly supported kernels and Gaussian kernels as well as Hermite radial basis functions. We demonstrate that our method provides noticeable improvement for grazing rays and transparent rendering.

An experimental investigation of the effect of ride control systems on the motions response of high-speed catamarans in irregular waves

To ensure high-quality passenger comfort and enhance the operability and performance of high-speed catamarans, reducing the severity of motions and structural loads using Ride Control Systems (RCS) is beneficial. To optimize ride control algorithms, it is essential to have a thorough understanding of the RCS in actual ship sailing conditions. In this paper, a set of towing tank tests was undertaken to study the effectiveness of different control algorithms, including linear and nonlinear versions of the heave control, pitch control, and local control, on motion responses of a 2.5 m scaled model of a 112 m INCAT Tasmania high-speed catamaran in irregular waves. The RCS included a centre bow-fitted T- Foil and two transom-mounted stern tabs. Obtained results were also compared with the scale model responses with passive RCS and with no RCS fitted. Heave and pitch motion responses as well as vertical accelerations of the catamaran were calculated in head seas at a model speed of 2.89 m/s (37 knot full scale), a modal period of 1.5 s (10 s full scale) and two significant wave heights of 60 mm and 90 mm, simulating full scale wave heights of 2.7 m and 4 m, respectively. It was demonstrated that deploying a passive RCS led to modest reductions in the peak motion responses. The most significant reductions in ship motions took place in the nonlinear modes of the heave and pitch control algorithms at a significant wave height of 60 mm (full-scale 2.7 m). In this condition, the nonlinear pitch control mode was demonstrated to be the most effective algorithm since this control mode mitigated the peak pitch RAO by 41% and vertical accelerations by 46%. This was a substantial reduction in ship motions with the RCS at an equivalent full-scale speed of 37 knot at 2.7 m wave height in the random sea condition.

Accuracy of New Intraocular Lens Calculation Formulae in eyes undergoing Silicone Oil Removal/Pars Plana Vitrectomy-cataract surgery.

To investigate the performance of novel intraocular lens (IOL) calculation formulae (Barrett Universal II [BUII], Emmetropia Verifying Optical [EVO], and Kane) and conventional formulae (Haigis, Hoffer Q, Holladay 1, and SRK/T) in patients who underwent pars plana vitrectomy (PPV) or silicone oil removal (SOR) combined with cataract surgery. In total, 301 eyes from 301 patients underwent PPV/SOR with concomitant cataract surgery were enrolled and divided into four groups according to preoperative diagnosis: silicone oil-filled eyes after PPV, epiretinal membrane, primary retinal detachment (RD), and macular hole. BUII exhibited the smallest mean absolute error (MAE) (0.65 diopters [D]) and median absolute error (MedAE) (0.39 D) in total. In patients with RD, each formula exhibited the worst refractive outcomes in diverse vitreoretinal pathologies (P<.01), and no difference in accuracy between the seven formulas was observed (P=.075). For long eyes, the second linear (WK2) version of the Wang-Koch adjustment significantly reduced the MedAE for Holladay 1 and SRK/T (P<.001 and P=.019). In combined surgery, both new and conventional formulas using WK2 adjustment demonstrated satisfactory performance, with BUII exhibiting the best overall performance. However, in patients with RD, all seven formulas showed less favorable performance.

E-Procurement Implementation, Internal Control, and Organizational Commitment to Fraud Prevention Procurement of Goods and Servicesin Device Organizations Area (DOA) City Yogyakarta

This study aims to determine the effect of implementing e-procurement, internal control, and organizational commitment to prevention of procurement fraud goods and services in the Regional Apparatus Organization (OPD) of the City of Yogyakarta. Population of this research is 27 OPD in the city of Yogyakarta, the sample used in study This is purpopsive sampling. Study. This use data primary Which form questionnaire addressed to the Regional Apparatus Organization (OPD) of the City of Yogyakarta. Testing hypothesis in study. This use analysis regression linear double help SPSS software version 25. The results of this study indicate that implementation e-procurement influential on the prevention of fraud in the procurement of goods and services, while control internal and organizational commitment have no effect on the prevention of procurement fraud goods And service on Organization Device OPD area Yogyakarta City

ANALYSIS ON CURRENT ACCOUNT SAVING ACCOUNT (CASA), NON-PERFORMING LOAN (NPL), DAN LIKUIDITAS (LDR) TO BANKING PROFITABILITAS (ROA) SITUATION ARROUND PANDEMIC COVID 19

Interrelated of situation as pandemic covid 19 happened which was data conducted then to be tested and analyzed the effect of Non-Performing Loans, Current Account Saving Accounts and Loan to Deposit Ratios on Return on Assets in banking companies listed on the Indonesia Stock Exchange for the 2019-2021 period. This study conducted on 48 banking listed companies which matched the criteria for the research sample. The analysis technique used multiple linear regression and SPSS version 20 as tools for data processing. The results of this study indicate that Non-performing Loans and Current Account Saving Accounts have an effect on Return on Assets. Meanwhile, the Loan to Deposit Ratio hasn’t significantly affected on Return on Assets.

On linearized versions of matrix inequalities

In this note, we prove linear versions of the Aleksandrov-Fenchel inequality and the Brunn-Minkowski inequality for positive semidefinite matrices. With this aim, given a positive semidefinite matrix A and a linear subspace L, we consider a family of matrices having the same projection onto L, obtaining a linear version of the Aleksandrov-Fenchel inequality. In the case of the Brunn-Minkowski inequality, the milder assumption of having equal determinant of the projection of A onto L will be enough to obtain a linearized version of this inequality.

Local rigidity of manifolds with hyperbolic cusps I. Linear theory and microlocal tools

This paper is the first in a series of two articles whose aim is to extend a recent result of Guillarmou-Lefeuvre on the local rigidity of the marked length spectrum from the case of compact negatively-curved Riemannian manifolds to the case of manifolds with hyperbolic cusps. In this first paper, we deal with the linear (or infinitesimal) version of the problem and prove that such manifolds are spectrally rigid for compactly supported deformations. More precisely, we prove that the X-ray transform on symmetric solenoidal 2-tensors is injective. In order to do so, we expand the microlocal calculus developed by Bonthonneau and Bonthonneau-Weich to be able to invert pseudodifferential operators on Sobolev and H\"older-Zygmund spaces modulo compact remainders. This theory has an interest on its own and is extensively used in the second paper [arXiv:1910.02154] in order to deal with the nonlinear problem.

Variant ADRC design paradigm for controlling uncertain dynamical systems

This article discusses a novel design paradigm for controllers based on the active disturbance rejection methodology. The current approach focuses on the linear version, known as LADRC, for application in the control problems of uncertain nonlinear systems. The choice of such a method is due to its well-known properties of robustness against parametric uncertainties, external disturbances, and unmodeled dynamics of the system. Some variants of the LADRC method have already been reported in the literature. The common feature verified in all of them is using a parameterized state-feedback control law fed by an extended state estimator (ESO), which is responsible for estimating the state variables and non-measurable signals of the plant. The ADRC paradigm proposed in this work consists of modifying the structure of the ESO by defining the input signal as an additional plant state variable. The key idea of adopting such a modification is to force the desired control law to be generated directly from an ESO estimate. The stability and convergence properties of the resulting closed-loop system are discussed and numerical simulations and experimental results illustrate the controller’s performance.

Energy response and spatial alignment of the perturbed electron gas.

We study the linear energy response of the uniform electron gas to an external harmonic perturbation with a focus on resolving different contributions to the total energy. This has been achieved by carrying out highly accurate abinitio path integral Monte Carlo (PIMC) calculations for a variety of densities and temperatures. We report a number of physical insights into effects such as screening and the relative importance of kinetic and potential energies for different wave numbers. A particularly interesting finding is obtained from the observed non-monotonic behavior of the induced change in the interaction energy, which becomes negative for intermediate wave numbers. This effect is strongly dependent on the coupling strength and constitutes further direct evidence for the spatial alignment of electrons introduced in earlier works [T. Dornheim et al., Commun. Phys. 5, 304 (2022)]. The observed quadratic dependence on the perturbation amplitude in the limit of weak perturbations and the quartic dependence of perturbation amplitude corrections are consistent with linear and nonlinear versions of the density stiffness theorem. All PIMC simulation results are freely available online and can be used to benchmark new methods or as input for other calculations.

Application of Active Disturbance Rejection in a Bearingless Machine with Split-Winding

In this paper it is proposed the displacement control of a bearingless induction machine (BIM) with split winding and optimized drive structure using Active Disturbance Rejection Control (ADRC). Considering that the BIM is a multivariable, nonlinear, and time-varying system with coupled variables, advanced control techniques can be useful in order to make the system operate efficiently and with good dynamic performance. The ADRC considers the total disturbance, composed of unmodeled dynamics, nonlinearities, uncertainties, and load variations, as an extended state and estimates it in real-time through a state observer. This increases the overall robustness of the control system to disturbances of different natures. The application of the ADRC technique on the radial position control of the BIM used in this work showed that a Linear version of ADRC is not able to compensate for radial load disturbances but this drawback can be solved by the use of a nonlinear observer in the ADRC structure. Besides that, both control versions of the ADRC were able to make stable the naturally unstable radial displacement of the machine’s rotor.

Optimal convergence for time-dependent linearized Kuramoto–Sivashinsky type problems: A new approach

We continue the convergence analysis approach initiated in Fishelov and Croisille (2021). Here we consider the case of linear versions of Kuramoto–Sivashinsky type problems of the form ut+uxxxx+duxx+au=f in one dimension and ut+Δ2u+dΔu+au=f in two dimensions. We suggest compact schemes for their approximations. For these methods the truncation error is only of first-order at near-boundary points, but is of fourth order at interior points. We prove that the rate of convergence of the discrete in space, continuous in time schemes is actually four, thus the error tends to zero as O(h4), where h is the size of the mesh. Numerical results shown for the Kuramoto–Sivashinsky equations in 1D and in 2D assess the fourth-order accuracy of the scheme.

Global linear stability analysis of kinetic trapped ion mode (TIM) in tokamak plasma using the spectral method

Trapped ion modes (TIMs) belong to the family of ion temperature gradient (ITG) modes, which are one of the important ingredients in heat turbulent transport at the ion scale in tokamak plasmas. A global linear analysis of a reduced gyro-bounce kinetic model for trapped particle modes is performed, and a spectral method is proposed to solve the dispersion relation. Importantly, the radial profile of the particle drift velocity is taken into account in the linear analysis by considering the magnetic flux ψ dependency of the equilibrium Hamiltonian in both the quasi-neutrality equation and equilibrium gyro-bounce averaged distribution function . Using this spectral method, linear growth rates of TIM instability in the presence of different temperature profiles and precession frequencies of trapped ions, with an approximated constant Hamiltonian and the exact ψ dependent equilibrium Hamiltonian, are investigated. The growth rate depends on the logarithmic gradient of temperature κ T , density κ n and equilibrium Hamiltonian . With the exact ψ dependent Hamiltonian, the growth rates and potential profiles are modified significantly, compared to the cases with an approximated constant Hamiltonian. All the results from the global linear analysis agree with a semi-Lagrangian based linear Vlasov solver with good accuracy. This spectral method is very fast and requires much less computation resources compared to a linear version of the Vlasov-solver based on a semi-Lagrangian scheme.