bluuebunny/crossref_metadata_2025_split huggingface dataset:
Sensitivity Analysis and Accuracy Synthesis of a Deployable Antenna Considering Clearances and Link Tolerances
Authors: Ding Jianzhong , Dong Yang , Liu Xueao , Wang Chunjie 
Published: September 2022

AbstractAntenna panels of a satellite are usually deployed and supported by a deployable mechanism. The accuracy of the deployable mechanism is important because it directly affects the performance of the satellite. This article focuses on the accuracy analysis of a deployable antenna considering the coupled effects of joint clearances and link tolerances, and based on which, two accuracy synthesis methods are further discussed. A novel geometric error modeling method is proposed to estimate the error space of the outer panel of the antenna. The advantages of the proposed method are that it can handle the overconstrained constraints efficiently and decouple the positioning error and orientation error. Moreover, the error space is visualized using a sampling method. Based on the proposed error modeling method, the maximum orientation and positioning errors are computed, and following which, sensitives of the antenna accuracy to tolerances considering various sizes of clearances are analyzed. Finally, two optimization methods for accuracy synthesis are discussed, and instructive conclusions are drawn.
A Multi-Objective Comprehensive Evaluation of Heat Transfer Performance of a Direct-Contact Heat Exchanger
Authors: Li Biao , Yang Puyi , Li Zexi , Xu Jianxin , Wang Hua 
Published: September 2022

Abstract
Direct-contact heat exchangers have great potential for waste-heat utilization. This study established a multi-objective evaluation model of the volumetric heat-transfer coefficient, entransy dissipation, and uniformity of the temperature difference field of the direct-contact heat exchanger. The optimal operating parameters for the heat exchanger were obtained by experimentally investigating the relationship between the operating parameters and the volumetric heat-transfer coefficient, entransy dissipation, and uniformity of the temperature difference field. The results indicated that the smaller the entransy, the greater the effectiveness of the heat exchanger in the direct-contact heat exchanger. The results also indicated that the volumetric heat-transfer coefficient increased with the increase in the flowrate ratio and initial temperature difference. The study found that entransy demonstrated the smallest dissipation and the largest effectiveness of the heat exchanger when the initial temperature difference was 120 °C and the flow ratio was 6:1. This study has guiding significance for the optimal design of direct-contact heat exchangers.
Numerical Investigation on the Cooling Effectiveness and Pressure Loss of a Novel Laminated Cooling Configuration With Cellular Partition
Authors: Li Honglin , Xie Feifan , Wang Yaning , Wang Chen , Yan Yan , Cui Jiahuan 
Published: September 2022

Abstract
The laminated cooling is believed to be a promising cooling scheme for the next generation of advanced gas turbines. In order to build a cooling system with high performance, it is necessary to develop a more revolutionary cooling configuration for hot components in gas turbines. In this study, a novel laminated cooling configuration with cellular partition has been proposed. The local/average heat transfer parameters and pressure loss coefficient have been evaluated by comparing with traditional laminated cooling configurations with and without circular pin. Different adiabatic and conjugate cooling configurations are explored numerically to investigate the external film coverage and internal heat transfer. Seven different flow conditions with blowing ratios ranging from 0.2 to 1.4 are investigated for all numerical models. Results indicate that the novel laminated cooling configuration exhibits a higher cooling advantage. With the blowing ratios investigated, the cooling effectiveness of laminated cooling configuration with cellular partition increased by 4.5–13.4% and 10.8–23.4% compared with the cases with and without circular pin, respectively. With higher cooling performance, the pressure loss coefficient only increased by 4.4%. Two mechanisms have been identified for heat transfer enhancement of the novel laminated cooling configuration: (1) the cellular partition increases the transverse diffusion of film cooling outflow resulting in an increased external film cooling effectiveness and (2) the film hole area and partition area have been increased in the new structure, which enhances the internal heat transfer. The proposed structure has the potential for cooling the high-pressure turbines in the future.
Optimizing and Modelling Performance Parameters of IC Engine Fueled With Palm-Castor Biodiesel and Diesel Blends Combination Using RSM, ANN, MOORA and WASPAS Technique
Authors: Samuel Olusegun D. , Pathapalli Venkateshwar R. , Enweremadu Christopher C. 
Published: September 2022

Abstract
Biodiesel fuel properties and engine characteristics can be improved by using hybrid biodiesel and robust optimization tools. This study predicts the performance parameters of diesel engines fueled with castor-palm kernel biodiesel (CPKB) and diesel fuel blend using response surface methodology (RSM) and artificial neural network (ANN). Optimization of the performance parameters was also carried out using multi-criteria decision-making methods (WASPA S and MOORA) for the first time. The RSM and ANN were employed in predicting the performance parameters such as CPKB fuel blends (FB) (0–20 vol.%), engine load (EL) (0–50%), and engine speed (ES) (1000–2000 rpm) on the performance indicators viz. brake torque (BT), brake power (BP), brake specific fuel consumption (BSFC), brake thermal efficiency (BTE). The Box-Behnken design was used for performing the experimental trials. The RSM model predicted the BT of 107.95 Nm, BP of 11.300 kW, BSFC of 0.057 kg/kWh, BTE of 15.147%, at the optimal level of CPKB blends of 20% (B20), engine load of 50%, and an engine speed of 1000 rpm, respectively. Results showed that based on the values of R2and average absolute deviation (AAD) obtained, the predictive capability of both RSM and ANN were within acceptable limits.
The best experimental trial from the WASPAS method is the #20 experimental run and the parameter combination are FB-10%, EL-25, and ES-1500 rpm, whereas for the MOORA method, five such experimental trials were observed viz., #1 run: FB-0%, EL-0, and ES-1000 rpm, #2 run: FB-20%, EL-0 and ES-1000 rpm, #5 run: FB-0%, EL-0, and ES-2000 rpm, #6 run: FB-20%, EL-0, and ES-2000 rpm #11 run: FB-10%, EL-0, and ES-1500 rpm.
Comparison of Solar Thermal Collectors and Solar PV Heat Pump Systems
Authors: Mitri Frederick B. , Anderson Kevin R. 
Published: September 2022

Abstract
This paper presents a comparison between traditional flat plate solar thermal collector systems and solar photovoltaic (PV) heat pump systems. The purpose of this analysis was to determine whether or not heat pump technology has matured to the point that a solar PV system paired with a heat pump could outperform a traditional solar thermal flat plate collector system. To this end, two systems with identical panel footprints of 7.6 m2 (82 ft2) were modelled and analyzed at four different locations being Los Angeles CA, Phoenix AZ, Seattle WA, and Denver CO. The expected energy production and Levelized Cost of Energy (LCOE) for both systems at these locations were determined. The solar fraction for the solar thermal collector systems and PV heat pump systems at the four locations studied were found to be f = 0.44 and f = 0.99 in Los Angeles, f = 0.44 and f = 1.00 in Phoenix, f = 0.21 and f = 0.62 in Seattle, and f = 0.34 and f = 0.90 in Denver. As such, it is evident that the solar PV heat pump systems produced more thermal energy than the solar thermal collectors at all locations tested. The LCOE for the solar thermal collector systems and solar PV heat pump systems at each location were found to be 48.42 ¢/kWh and 36.57 ¢/kWh at Los Angeles, 55.37 ¢/kWh and 36.13 ¢/kWh at Phoenix, 81.47 ¢/kWh and 97.29 ¢/kWh at Seattle, and 52.27 ¢/kWh and 67.50 ¢/kWh at Denver. From these values, it can be seen that the solar PV heat pump systems have a lower LCOE in the warmer climates where ground source heat pumps are not needed but have slightly higher LCOE values in cooler climates where they are. As such, this study has found that solar PV heat pump systems have matured enough to outperform solar thermal flat plate collectors in most situations.
A Non-Intrusive Particle Temperature Measurement Methodology Using Thermogram and Visible-Light Image Sets
Authors: Ortega Jesus D. , Anaya Guillermo , Ho Clifford K. , Vorobieff Peter , Mohan Gowtham 
Published: September 2022

Abstract
The direct measurement of the particle egress rate and heat losses from a particle receiver has been a topic of interest for the advancement of CSP technologies. Particle-plumes that egress from the receiver’s cavity have variable size, density, and rate of egress, which can be a challenge for the field of thermometry. In a previous publication, a methodology to estimate the average particle temperature and discharge rate of a particle curtain was developed by the University of New Mexico (UNM)-Sandia team. This work focuses on the application of a novel non-intrusive method using a high-speed IR camera (ImageI8300 from Infratec) and a visible-light camera (Nikon D3500) to achieve the estimation of the particle egress rate as well as the corresponding advective losses of the particle-plume during on-sun tests at Sandia. Data sets were collected for multiple test days with different test conditions throughout the test campaign. To understand which variables impact the particle egress rate of the receiver, a correlation analysis was completed to determine the impact of 6 variables which include: average particle temperature, curtain mass flow rate, input heat flux, wind speed and direction, and receiver flow configuration. From the results, it was determined that the average particle temperature as well wind direction have a positive correlation to increased particle losses from the system.
Study of the Piezoelectric Properties of UV-Selective Optically Transparent Zn(O,S) Based Solar Cells
Authors: Hijazi Iyad , Xie Rui 
Published: September 2022

Abstract
Hybrid photovoltaic and piezoelectric structures can convert photons to electrical energy by using the photovoltaic part and mechanical energy to electrical energy by using the piezoelectric part, in the presence of rain, wind etc, where there is not enough sunlight for photo-conversion. To date, state-of-the art UV-selective solar cells are mainly based on the use of zinc oxide (ZnO) as the absorber material. ZnO presents high absorption coefficient (α(λ) &gt; 104 cm−1 for λ &lt; 390 nm) and a direct energy bandgap of 3.37 e V. By anion alloying ZnO with sulfur (S), it is possible to fabricate Zn(O,S) mixed crystals that present a bandgap energy bowing with a reported minimum value at 2.7 eV, presenting a more optimal spectral match with the UV region. These structures can be used to create UV-selective solar cells with high transparency in the visible region, that can be utilized in many applications including the development of nonintrusive building-integrated photo-voltaic (BIPV) elements as transparent solar windows and glass-based solar façades. In addition, ZnO and Zinc Sulfide (ZnS) have the ability to convert applied mechanical strain energy to harvestable electrical energy in nano/microdevice. The wurtzite ZnO and ZnS materials exhibit excellent piezoelectric property along the [0001] direction because of their non-centrosymmetric structure. Therefore, in this research we conducted molecular dynamic (MD) simulations on a selected UV-TPV Zn(O1–xSx) structures and reported their polarization and the piezoelectric constants and compared them to pure ZnO and ZnS structures.
The MD results show that the polarization and piezoelectric constants values were all intermediate between those obtained for ZnO and ZnS bulk structures, indicating good piezoelectric properties for the Zn(O1–xSx) structures.
Thermal-Mechanical Analysis of an Additive Manufacturing Ceramic Heat Exchanger for High-Temperature Recuperator in a sCO2 Power System
Authors: Ma Zhiwen , Jape Sameer , Davenport Patrick , Lipke David 
Published: September 2022

Abstract
Supercritical CO2 (sCO2) Brayton power cycle can be configured in a closed-loop power system and has a potentially high cycle efficiency. Compactness and high efficiency of a sCO2 power block make the sCO2 Brayton cycle a versatile power cycle in broad applications. While many heat sources are of sufficient intensity to produce high temperature working fluids to achieve high cycle efficiency, the thermal-mechanical stability of traditional materials (e.g., steels and nickel-based superalloys) used in construction of heat exchangers and turbine components limits the operating conditions and thus thermodynamic efficiency of the system. This effort seeks to establish the viability of ceramic heat exchanger technologies for the most extreme operating conditions envisioned for power generation and other high temperature processes. Heat exchangers constructed from ultra-high temperature ceramics, a class of extreme environment materials featuring melting points (Tmp.) above 3000°C, is particularly appealing for sCO2 Brayton cycles given their ultra-low creep rates and very high retained strength at low homologous temperatures (i.e., T &lt; 0.5 Tmp., or at least 1500°C). To translate these materials properties to ultra-high temperature heat exchangers, innovations are required in ceramic manufacturing techniques to realize the complex architectures featured in compact heat exchangers with high power density. With appropriate processing, ZrB2-SiC based compositions can be sintered to near full density and shaped into complex topologies via ceramic additive manufacturing methods. This paper analyzes heat exchanger designs and explores thermal-mechanical implications of the operating environment. Thermal flow, heat transfer, and conjugate mechanical analyses provide insights into benefits and risks associated with the design approach.
Post-reperfusion hyperperfusion after endovascular stroke treatment: a prospective comparative study of TCD versus MRI
Authors: Kneihsl Markus , Hinteregger Nicole , Nistl Oliver , Deutschmann Hannes , Horner Susanna , Poltrum Birgit , Fandler-Höfler Simon , Hatab Isra , Haidegger Melanie , Pinter Daniela , Pichler Alexander , Willeit Karin , Knoflach Micheal , Enzinger Christian , Gattringer Thomas 
Published: September 2022

BackgroundIncreased middle cerebral artery (MCA) blood flow velocities on transcranial duplex sonography (TCD) were recently reported in individual patients after successful mechanical thrombectomy (MT) and were related to intracranial hemorrhage and poor outcome. However, the retrospective study design of prior studies precluded elucidation of the underlying pathomechanisms, and the relationship between TCD and brain parenchymal perfusion still remains to be determined.MethodsWe prospectively investigated consecutive patients with stroke successfully recanalized by MT with TCD and MRI including contrast-enhanced perfusion sequences within 48 hours post-intervention. Increased MCA flow on TCD was defined as >30% mean blood flow velocity in the treated MCA compared with the contralateral MCA. MRI blood flow maps served to assess hyperperfusion rated by neuroradiologists blinded to TCD.ResultsA total of 226 patients recanalized by MT underwent post-interventional TCD and 92 patients additionally had perfusion MRI. 85 patients (38%) had increased post-interventional MCA flow on TCD. Of these, 10 patients (12%) had an underlying focal stenosis. Increased TCD blood flow in the recanalized MCA was associated with larger infarct size, vasogenic edema, intracranial hemorrhage and poor 90-day outcome (all p≤0.005). In the subgroup for which both TCD and perfusion MRI were available, 29 patients (31%) had increased ipsilateral MCA flow velocities on TCD. Of these, 25 patients also showed parenchymal hyperperfusion on MRI (sensitivity 85%; specificity 62%). Hyperperfusion severity on MRI correlated with MCA flow velocities on TCD (rs=0.379, p<0.001).ConclusionsTCD is a reliable bedside tool to identify post-reperfusion hyperperfusion, correlates well with perfusion MRI, and indicates risk of reperfusion injury after MT.
Investigations of Zr/TiO2-based nanocomposites for efficient plasmonic dye-sensitized solar cells
Authors: Akram Muhammad , Javed Hafiz Muhammad Asif , Ghaffar Abdul , Majeed Muhammad Irfan 
Published: September 2022

Renewable energy resources have a wide range of materials to fulfill the energy demand. All developed countries are trying to adopt renewable energy resources to overcome the energy crises. Recent research showed that dye-sensitized solar cells (DSSCs) are optimistic and cheap customers for energy purposes. Most used materials in DSSCs are environment-friendly. Zirconium/titanium dioxide-based nanocomposite photoanodes are mostly stable and efficient for DSSCs. SEM, XRD, UV-visible spectroscopy and Raman spectroscopy were employed to check the morphological, structural and optical properties of Cu and Ag-doped Zr/TiO2, respectively. IV measurements investigation showed that due to the Cu and Ag contents’ effects, the power regeneration efficiency was enhanced by 8.18% by using [Formula: see text] of 0.73 V, [Formula: see text] of 8.78 mA cm[Formula: see text], FF 59.03% and IPCE of 62.43%, due to a shortage in recombinations of charge carrier. The carrier transporting mechanism (EIS) was done at a frequency range of 100 mHz to 1 MHz.
Organizational Effectiveness Related to Disaster Risk Reduction Management in Taytay, Rizal, Philippines: Perspective from the Academic Leaders
Authors: Lao Clarice , San Pedro Jay R , Caballes Dennis 
Published: September 2022

Prior to the global health crisis, Taytay, Rizal, Philippines is vulnerable to the different natural disasters and calamities. With this, the researchers see the value of investigating disaster risk reduction management being practiced by the local government unit through the lens of academic leaders. With this, a descriptive research design was implored to gather and substantiate the organizational effectiveness with the research niche. The 100 respondents were selected through purposive and snow-ball sampling who academic leaders from the various educational institutions within the municipality of Taytay, Rizal, Philippines. Based on the findings, it shows that the local government unit of Taytay, Rizal has manifested an effective organizational approach in the implementation of the disaster risk reduction management as perceived by the academic leaders. Afterward, the researchers draft an action plan to further strengthen the disaster risk reduction management plan of the local government unit.
Interactive Simulation on Modern Physics: A Systematic Review
Authors: Candido Keneth John O. , Gillesania King Christian C. , Mercado Justine C. , Reales Joy Mae B. 
Published: September 2022

Physics is a theoretical science, understanding the concepts requires actual visual representations and models. Physics instructors should teach physics using inquiry, discovery, demonstration, simulation, practical work, lab-based activities, and other practical experiences. The current status of knowledge and practice regarding interactive simulation in the teaching of modern physics is presented in this systematic literature review. By methodically evaluating and summarizing the most pertinent previous research publications published from December 2002 to January 2022, it offers guidance for instructional designers and scholars. After careful consideration and screening, a total of eleven studies were chosen for a thorough analysis and synthesis. The results showed that the objective of the research studies on using interactive simulation in modern physics is to enhance students' critical thinking skills and creative problem-solving skills. It has been demonstrated that interactive simulation technologies like Java applets and Physics Education Technology (PhET) are successful at teaching modern physics. The success or failure of employing interactive simulation is influenced by teachers, school staff, students, simulation design, and technology used. The findings imply that educational institutions should provide teachers and administrators with tutorials and training, and this review recommend that the interactive simulation should be available and that a gadget-friendly simulation must be developed.
Lesson Preparation Practices of Pre-service High School Science Teachers: Implications to Science Education
Authors: Yacap Marites J. 
Published: September 2022

Teacher preparation is a vital factor in the development of effective future teachers. As such, this study tried to determine the pre-service teachers’ lesson preparation practices in one of the Teacher Education Institutions in the Philippines and provided descriptions of their practice teaching experiences particularly on lesson planning/preparation. Quantitative and qualitative methods of research were used wherein data were gathered through questionnaires, documentary analysis and semi-structured interviews. Results revealed that the pre-service science teachers followed the systematic method of lesson preparation with the use of detailed lesson plans. Their lesson preparation practices are good and they are already prepared to face and hurdle the task of a real classroom teacher. Despite these, there are still aspects in lesson preparation that needs to be further developed like the formulation of affective domain objectives as well as the selection of appropriate motivational and assessment techniques. To further develop the pre-service program for science education, the study recommends that Teacher Education Institutions continue to design programs and activities regarding pre-service teachers’ development not only in science but also in other subject areas to enhance their lesson planning skills.
Practices on Waste Disposal and Its Environmental Effects
Authors: Aming-Hayudini Magna Anissa E. , Jaddani Mohammad Yusof T. , Habibun Salta I. 
Published: September 2022

The study aimed to determine the practices of waste disposal among residents of Barangay Upper Sanraymundo, Jolo, Sulu, Philippines. The researchers sought to answer to the following questions: What is the demographic profile of the resident in terms of educational attainment? What are the practices on waste disposal among the residents? What are the effects on environment of waste disposal practices among the residents? And; is there a significant effect of the waste disposal practices on environment?
Quantitative type of research was utilized specifically the descriptive-predictive research method. The researchers made used of self-structured survey questionnaire based from related literature, related studies and validation of experts. Convenience sampling was used in determining the selected 99 respondents out of 8,308 populations of Upper Sanraymundo Jolo, Sulu, Philippines.
Based on the findings of the gathered data, it was therefore concluded that majority of the respondents are high school graduates. It was also concluded that the majority of the residents always practice waste disposal. The study also found out that the majority of the respondents are aware about the effect of solid waste if not disposed properly. It also concluded that there is a significant effect of solid waste on environment.
Among the findings and conclusions, the highest priority recommendation policies in this study are to strengthen the Republic Act 9003 also known as Ecological Solid Waste Management of 2000 to maintain the necessary policy framework and continue implementing the integrated waste management plan based on 3Rs (reduce, reuse, and recycle) of which the Local Government of Jolo, Sulu, Philippines is strictly complying on the said mandates.