Matching Design Research Articles

Hydraulic components’ matching optimization design and entropy production analysis in a large vertical centrifugal pump

Hydraulic components’ matching optimization design and entropy production analysis in a large vertical centrifugal pump

An enhanced broadband class-J mode power amplifier for 5G smart meter applications

Background: With the tremendous increase in the usage of smart meters for industrial/ household purposes, their implementation is considered a crucial challenge in the Internet of Things (IoT) world, leading to a demand for emerging 5G technology. In addition, a large amount of data has to be communicated by smart meters efficiently, which needs a significant enhancement in bandwidth. The power amplifier (PA) plays a major role in deciding the efficiency and bandwidth of the entire communication system. Among the various modes of PAs, a newly developed Class-J mode PA has been proven to achieve high efficiency over a wide bandwidth by maintaining linearity. Methods: This paper proposes a Class-J mode PA design methodology using a CGH40010F-GaN device that operates at a 3.5 GHz frequency to meet the requirements of 5G wireless communication technology for the replacement of existing 4G/LTE technology used for advanced metering infrastructure (AMI) in smart grids. This research's main objective is to design the proper matching networks (M.Ns) to achieve Class-J mode operation that satisfies the bandwidth requirements of 5G smart grid applications. With the target impedances obtained using the load-pull simulation, lumped element matching networks are analyzed and designed in 3 ways using the ADS EDA tool. Results: The simulation results reveal that the proposed Class-J PA provides a maximum drain efficiency (D.E) of 82%, power added efficiency (PAE) of 67% with 13 dB small-signal gain at 3.5 GHz, and output power of 40 dBm (41.4 dBm peak) with a power gain of approximately 7 dB over a bandwidth of approximately 400 MHz with a 28 V power supply into a 50 Ω load. Conclusion: The efficiency and bandwidth of the proposed Class-J PA can be enhanced further by fine-tuning the matching network design to make it more suitable for 5G smart meter/grid applications.

Principles and methods for determining calendar life and corrosion tolerance of mechanical parts

In order to facilitate the determination of the calendar life of mechanical parts, the author summarized his relevant research papers that had studied for many years as eight distinct topics: (A). The principle and method for compiling the equal-damage temperature and humidity spectrum; (B). The principle for preparing the high concentration medium solution; (C). The principle and method for determining the metal calendar life; (D). The principle and method for determining the protective coating calendar life; (E). The principle and method for determining the total calendar life; (F). The principle of the reliability processing; (G). The principle and method for determining the corrosion damage tolerance; (H). The principle and matching design method to ensure that the total fatigue life and the total calendar life of the mechanical part were safe simultaneously. The above contents established a complete set of theoretical systems and methods for determining the calendar life.

The color matching design based on polynomial regression

Camouflage spots are mostly color patches of different colors. Compared with the traditional empirical color matching method, computer color matching can quickly and effectively calculate the proportion of red, yellow, and blue primary colors. In general, camouflage computer color matching in the practical application of the initial formula is not accurate and multiple color modification still cannot match. First, we measured the chroma coordinates of 98 standard swatches made of red, green, and blue coatings in different proportions by the OHSP-660 spectral reflectance tester. Then, we adopted polynomial regression algorithm by Statistical Product and Service Solutions (SPSS) to obtain the regression equation between [Formula: see text], [Formula: see text], [Formula: see text], and [Formula: see text]. Finally, the fitting equation is used to obtain the paint color scheme in the coordinates of [Formula: see text], [Formula: see text], and [Formula: see text] in arbitrary uniform color space, so as to realize the purpose of computer color matching. The experimental results show that the minimum color difference is 1.691 ( L* a* b* unit) the maximum color difference is 2.497, which meets the design requirements of camouflage and target color difference being no more than 3. Our work provides a theoretical basis for the further development of computer color matching system in camouflage.

Relapse and Treatment Adherence in Patients with Schizophrenia Switching from Paliperidone Palmitate Once-Monthly to Three-Monthly Formulation: A Retrospective Health Claims Database Analysis.

PurposeRelapse and treatment adherence to paliperidone palmitate once-monthly (PP1M) and three-monthly (PP3M) formulations in patients with schizophrenia were evaluated and compared using health claims data.Patients and MethodsData (June 2015─June 2018) obtained from the MarketScan® Multi-State Medicaid Database were retrospectively analyzed. Patients aged ≥18 years with ≥1 claim for schizophrenia diagnosis prior to and/or at index date (i.e., date of first PP3M prescription record for PP3M patients and same month/year as the matched PP3M patients for PP1M patients) and continuous enrollment in the insurance plan for ≥12 months prior to index date (baseline) were included. PP1M cohort included patients who received ≥4 PP1M doses. PP3M patients were matched with PP1M patients (1:3) using propensity score matching and prevalent new user design. Outcome measures were relapse rate, time to relapse, proportion of days covered (PDC), and level of treatment adherence defined by PDC in five levels. Time to relapse was compared by Kaplan–Meier survival curves and log-rank test with the hazard ratio calculated using Cox proportion hazards model; PDC by t-test, and relapse rate and PDC categories by chi-square test.ResultsA total of 1564 patients (428 PP3M and 1136 PP1M) were included. Relapse rate was lower in PP3M cohort (10.5%) compared with PP1M cohort (15.7%). Incidence rate of relapse was 8.98/100 person-years (PY) in PP3M cohort and 13.81/100 PY in PP1M cohort. After a mean (SD) follow-up of 456.1 (240.28) days in PP3M cohort and 465.4 (237.95) days in PP1M cohort, PP3M patients had a significantly lower relapse risk (hazard ratio: 0.65, 95% CI: 0.47, 0.90) than PP1M patients. Treatment adherence was significantly (p<0.0001) higher in PP3M versus PP1M cohort.ConclusionRisk of relapse was significantly lower, and treatment adherence was significantly higher in PP3M cohort compared with PP1M cohort. Higher treatment adherence was associated with lower relapse rate.

Noise Removal Algorithm for Out-of-focus Blurred Images Based on Bilateral Filtering

The feature resolution of traditional methods for fuzzy image denoising is low, for the sake of improve the strepitus removal and investigation ability of defocused blurred night images, a strepitus removal algorithm based on bilateral filtering is suggested. The method include the following steps of: Building an out-of-focus blurred night scene image acquisition model with grid block feature matching of the out-of-focus blurred night scene image; Carrying out information enhancement processing of the out-of-focus blurred night scene image by adopting a high-resolution image detail feature enhancement technology; Collecting edge contour feature quantity of the out-of-focus blurred night scene image; Carrying out grid block feature matching design of the out-of-focus blurred night scene image by adopting a bilateral filtering information reconstruction technology; And building the gray-level histogram information location model of the out-of-focus blurred night scene image. Fuzzy pixel information fusion investigation method is used to collect gray features of defocused blurred night images. According to the feature collection results, bilateral filtering algorithm is used to automatically optimize the strepitus removal of defocused blurred night images. The simulation results show that the out-of-focus blurred night scene image using this method for machine learning has better strepitus removal performance, shorter time cost and higher export peak signal-to-strepitus proportion.

Spatial Matching Selectivity and Solution Structure of Organic-Metal Hybrid to Quadruplex-Duplex Hybrid.

The sequence-dependent DNA secondary structures possess structure polymorphism. To date, studies on regulated ligands mainly focus on individual DNA secondary topologies, while lack focus on quadruplex-duplex hybrids (QDHs). Here, we design an organic-metal hybrid ligand L1 Pt(dien), which matches and selectively binds one type of QDHs with lateral duplex stem-loop (QLDH) with high affinity, while shows poor affinity for other QDHs and individual G4 or duplex DNA. The solution structure of QLDH MYT1L-L1 Pt(dien) complex was determined by NMR. The structure reveals that L1 Pt(dien) presents a chair-type conformation, whose large aromatic "chair surface" intercalates into the G-quadruplex-duplex interface via π-π stacking and "backrest" platinum unit interacts with duplex region through hydrogen bonding and electrostatic interactions, showing a highly matched lock-key binding mode. Our work provided guidance for spatial matching design of selectively targeting ligands to QDH structures.

Spatial Matching Selectivity and Solution Structure of Organic–Metal Hybrid to Quadruplex–Duplex Hybrid

AbstractThe sequence‐dependent DNA secondary structures possess structure polymorphism. To date, studies on regulated ligands mainly focus on individual DNA secondary topologies, while lack focus on quadruplex–duplex hybrids (QDHs). Here, we design an organic–metal hybrid ligand L1Pt(dien), which matches and selectively binds one type of QDHs with lateral duplex stem‐loop (QLDH) with high affinity, while shows poor affinity for other QDHs and individual G4 or duplex DNA. The solution structure of QLDH MYT1L‐L1Pt(dien) complex was determined by NMR. The structure reveals that L1Pt(dien) presents a chair‐type conformation, whose large aromatic “chair surface” intercalates into the G‐quadruplex‐duplex interface via π–π stacking and “backrest” platinum unit interacts with duplex region through hydrogen bonding and electrostatic interactions, showing a highly matched lock‐key binding mode. Our work provided guidance for spatial matching design of selectively targeting ligands to QDH structures.

Multivariable optimization design method of composite stiffener based on critical stiffness

Based on the optimization design of ship structure, in view of the current situation that the structural safety margin is too high and the stiffener of stiffened plate is over matched, the concept of the critical stiffness of the stiffener matching was proposed, and the relationship between the stiffness ratio of plate and stiffener was derived. The optimization model of T-type composite stiffener was established. Based on Isight software platform, sensitivity analysis of design variables was carried out to simplify design variables. The Multi-Island genetic algorithm was used to carry out the multivariable optimization design of stiffener. Then, combined with the engineering practice, the design scheme was determined on the basis of the stiffener optimization results. The feasibility of the multivariable optimization design method was verified by the experimental study on the mechanical properties of composite stiffened plates. Research shows that the stiffness ratio formula of the stiffened plate can be used to guide the design of stiffener stiffness matching. In the optimization design of T-type composite reinforcement, the effect of web height on the optimization target is the most obvious. Under the condition of equal stiffness constraint, the optimal design scheme of T-type stiffener can achieve the optimization goal and ensure the better economy.

Research on the torsional vibration performance of a CVT powertrain with a dual-mass flywheel damper system

Continuously variable transmissions (CVTs) can achieve continuous changes in speed ratio and can better improve the ride comfort of the car. However, the torque fluctuation of the engine will reduce its transmission efficiency, and the torsional damper is usually matched to improve transmission efficiency and reduce vibration noise. In this paper, the model of a complete vehicle power transmission system was established by using the bond graph method. The relationships between each state variable were obtained according to the system causality and the direction of the power flow, based on which the dynamic model of the entire vehicle power transmission system was derived. A simulation of the powertrain with dual-mass flywheel-continuously variable transmission (DMF-CVT) was carried out, and the torsional stiffness of the dual-mass flywheel (DMF) was optimized. Taking a certain sport-utility vehicle (SUV) as the test bench, the vehicle road testing of the DMF before and after improvement was carried out, and the test results before and after the improvement were compared to verify the correctness of the optimization direction, which provided a reference for the matching and optimization design of the DMF-CVT power transmission system.

PROTOCOL: Social interventions to improve well-being of people with mental disorders: Global evidence and gap map.

Introduction: Mental illnesses play a role in poor health outcomes. Mental health is just as vital as physical health for an individual's total well-being. Alterations in mental health can have a significant impact on all aspects of life, including school or work performance, relationships with family and friends, and community participation. As a result, we would like to provide an overview of psychosocial interventions that are available to improve the well-being of people with mental health conditions and map available studies on the effectiveness of interventions provided in framework. Methods: This Evidence Gap Map will feature systematic reviews of the effects of interventions and effectiveness studies that used either: (a) randomised experimental design, or (b) rigorous quasi-experimental design, (c) natural experiments, (d) regression discontinuity, (e) propensity score matching, (f) difference in difference, (g) instrumental variables, (h) and other matching design, (I) Single subject design. We will include qualitative studies, relevant working papers will also be included. Also, language restricted to english from any country will be reviewed for inclusion. Electronic Search will be conducted with the help of a relevant databases in our area of study. Outcomes: Will be focused mainly on the basis of community-based Rehabilitation matrix adapted from the comprehensive mental health action plan, 2013-2020.

Impedance Matching Method for 6.78 MHz Class-E2-Based WPT System

The performance of a conventional Class-E2-based WPT system is sensitive to system parameters such as the coil coupling coefficient and load variation. System efficiency decreases rapidly when the coil coupling coefficient and load deviate from their optimum values. In this paper, an impedance matching method and a design procedure are proposed to maintain high system efficiency over a wider range of coupling coefficient and load variations. The load-pull technique is adopted to identify the high-efficiency load region of a Class-E power amplifier (PA), and a double-L-type impedance matching network (IMN) is proposed to transform the load impedance of a Class-E PA into a high-efficiency working region. Compared to a single L-type IMN, a double-L-type IMN is more flexible and has better tuning performance. A 6.78 MHz Class-E2-based WPT system was built to validate the proposed design method. The experimental results show that the proposed double-L-type IMN can significantly attenuate the decline in Class-E PA efficiency when system parameters dynamically change. With a double-L-type IMN, the WPT system could maintain high efficiency (over 55%) under a wider range of coil coupling coefficient and load variations. The peak system efficiency reached 83.2% with 13.7 W output power. The impedance matching method and design procedure in this paper could provide a practical solution for building a high-efficiency WPT system with strong robustness.

An efficient field programmable gate array based hardware architecture for efficient motion estimation with parallel implemented genetic algorithm

SummaryThe main idea of this article is to propose a hardware design of block matching (BM) algorithm for an efficient motion estimation (ME) strategy in a field programmable gate array platform based on a parallel implemented genetic algorithm (GA). Easiness and the effectiveness of the BM algorithm while implementing have a major drawback of low quality and computationally cost expensive during the process of ME. Therefore, here in this article, we suggest GA based BM for a quick and cost‐effective computation of motion vectors, without negotiating the quality factor. The ME carried out for various video sequences is implemented by using Xilinx ISE Design Suite 14.1. Delay, time, area, power, PSNR, MSE, SNR, SSIM, and NRMSE are the metrics used for analyzing the performance, and the simulation outcome shows that this parallel implemented BM architecture design shows an exotic improvement in time, quality and in utilization of power on estimating the motion than that of the conventional designs.

International opportunity development of born global firms: the role of institutions

PurposeThe purpose of the study is to investigate the international opportunity development process of born global firms embedded in two different institutional contexts: China, an emerging economy and Italy, a developed country. Drawing on the entrepreneurial opportunity literature and institutional theory, this study explores and draws insights into how home country institutions of born globals can influence the international opportunity development process of the firms.Design/methodology/approachThis paper adopts a qualitative case study approach with in-depth, semi-structured interviews of six born global companies from China and Italy. In doing so, this study uses a flexible pattern matching design, which is consistent with the qualitative research design of the paper.FindingsThe findings of the study indicate that home institutions play an influential, yet differential role in the international opportunity development processes of Chinese and Italian born global firms. While the Italian firms shape their opportunities mainly through product innovation, their Chinese counterparts develop opportunities primarily through networks embedded in their home institutional context.Originality/valueThe key contributions of the paper relate to an integrated analysis of the international opportunity development process of born globals in China and Italy based on institutional theory, which has received limited attention in the international entrepreneurship literature. In addition, the study advances the similarities and differences in the international opportunity development process in two different countries, thus providing valuable insights for policymakers and practitioners to enter international markets successfully.

Coating matching recommendation based on improved fuzzy comprehensive evaluation and collaborative filtering algorithm

Coating matching design is one of the important parts of ship coating process design. The selection of coating matching is influenced by various factors such as marine corrosive environment, anti-corrosion period and working conditions. There are also differences in the coating performance requirements for different ship types and different coating parts. At present, the design of coating matching in shipyards depends on the experience of technologist, which is not conducive to the scientific management of ship painting process and the macro control of ship construction cost. Therefore, this paper proposes a hybrid algorithm of fuzzy comprehensive evaluation and collaborative filtering based on user label improvement (IFCE-CF). Based on the analytic hierarchy process (AHP), the evaluation index system of coating matching is constructed, and the weight calculation process of fuzzy comprehensive evaluation is optimized by introducing the user label weight. The collaborative filtering algorithm based on matrix decomposition is used to realize the accurate recommendation of coating matching. Historical coating process data of a shipyard between 2010 and 2020 are selected to verify the recommendation ability of the method in the paper. The results show that using the coating matching intelligent recommendation algorithm proposed in this paper, the root mean square error is < 1.02 and the mean absolute error is < 0.75, the prediction accuracy is significantly better than other research methods, which proves the effectiveness of the method.

Tunable high acoustic impedance alumina epoxy composite matching for high frequency ultrasound transducer

Matching layer is a critical component that determines the performance of piezoelectric ultrasound transducer. For most piezoelectric materials, their acoustic impedances are significantly higher than human tissues and organs, so a tunable matching layer with a high acoustic impedance is required for optimizing the acoustic wave transmission. In this article, a high compression fabrication method is presented, with which the acoustic impedance of alumina-epoxy composite matching layer can be tuned from 6.50 to 9.47 MRayl by controlling the applied compression pressure and ratio of the components. The maximum acoustic impedance 9.47 MRayl can be achieved by compressing a mixture of 80% alumina weight ratio under a 62.4 MPa pressure. This enhancement mainly relies on the increased acoustic longitudinal velocity which enlarged the tolerance of high to ultra-high frequency transducer fabrication using quarter wavelength matching design. Furthermore, the attenuation of the matching layer developed by this method is only −10 dB/mm at 40 MHz. The very high acoustic impedance value and very low attenuation make this matching material superior than all reported matching materials, and therefore, can enhance the performance of the ultrasound transducers, especially for medical imaging applications.

Effects of Apprenticeship on the Short-Term Educational Outcomes of Vocational High-School Students

This study estimates the extent to which apprenticeship affects the academic trajectories of vocational high-school students. Previous research has shown that apprenticeship-based high schools (or dual vocational education) increase employment outcomes compared to school-based-only vocational education. Employing a propensity score matching design, we show that apprenticeship’s advantages do not occur at the expense of academic outcomes: apprentices are 0.5 percentage points more likely to graduate on time (p = 0.068) and 3.3 percentage points more likely to access higher education (p = 0.000) than their non-apprentice counterparts. In portraying apprenticeship as a strategy that benefits academic outcomes, this article highlights the importance of how vocational education systems are implemented.

Interface damage analysis of composite hat-stiffened panels

In order to reveal the mechanism of interfacial debonding damage of composite hat-stiffened panel, an eight-point bending model of single stiffened structure was designed. The finite element analysis was carried out by using the cohesive element to simulate debonding damage of interface between skin and rib. The deformation, interface stress and structural damage of the eight-point bending as well as the corresponding stiffened panel under axial compression were analyzed. The results showed that the initial debonding deformation was in good agreement with the interface stress distribution. For the eight-point bending model, although more damage appeared near the loading point due to stress concentration, it had little effect on the accurate prediction of interface damage behavior. The eight-point bending model can be used to evaluate the interface performance of corresponding multi-stiffened-panel during axial compression buckling by accurate simulation and parameter design, and it is helpful for the stiffness matching design of skin and stiffener.

Ecosystem Services Auctions: The Last Decade of Research

Auctions offer potential cost-effectiveness improvements over other mechanisms for payments for ecosystem services (PES) contract allocation. However, evidence-based guidance for matching design to application is scarce and research priorities are unclear. To take stock of the current state of the art, we conducted a systematic review and thematic content analysis of 56 peer-reviewed journal articles discussing ES auctions published in the last decade. Auctions were approached from three overlapping perspectives: mechanism design, PES, and policy analysis. Five major themes emerged: (1) performance, including measures like cost-effectiveness and PES criteria like additionality; (2) information dynamics like price discovery and communication effects; (3) design innovations like risk-integrating and spatially coordinated mechanisms; (4) contextual variables like policy context and cultural values; and (5) participation factors. Additional attention from policymakers and continued efforts to coordinate research in this diverse and interdisciplinary subfield may be beneficial.

Design method of power matching for reflux hydrodynamic transmission system

The capacity trend and characteristics of the torque converter (TC) are the basis for ensuring that a power reflux hydrodynamic transmission system (PRHTS) is well matched to the engine it is paired with. This paper proposes a design method for matching a PRHTS with a given engine. First, using the working principles of the PRHTS, the influence of a TC with different capacity trends on matching is analyzed, revealing that an impervious capacity-trend TC can ensure good matching performance. Then, by considering the working characteristics of a capacity adjustment device that can change the capacity coefficient of the PRHTS, a method for obtaining the range of TC capacity coefficient values is proposed. This method determines the range of TC capacity coefficients by finding the speed ratio and capacity coefficient that matches the maximum torque and optimal operating points of the engine. After adopting the matching design method proposed in this paper and upon comparison with the traditional hydrodynamic transmission system, the PRHTS is noted to improve the matching performance as well as the dynamic and economic performance of the wheel loader.