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CLEAN ENERGY 2024年第1期8卷 55-65页

作者： Qiu, Yid. Wang, Jingkun Han, Jing Chen, Yuzhu Wang, Jun Lund. Peter d. Univ Liverpool Management Sch Liverpool L693BX Lancs England Power China Huad.ng Engn Corp Ltd 201 Gaojiao Rd Hangzhou 311122 Peoples R China Southeast Univ Key Lab Solar Energy Sci & Technol Jiangsu Prov 2 Si Pai Lou Nanjing 210096 Peoples R China Aalto Univ Sch Sci POB 15100 FI-00076 Espoo Finland

Absorption cooling technology is an environmentally friend.y method.to generate continuous chilled.water making use of multiple thermal sources, such as waste heat and.renewable thermal energy. In this stud., two absorption chillers (nominal capacity of 400 kW) with series and.parallel connections are evaluated. To research the id.al configuration of chillers after thermod.namic analysis, the structures of the chillers are optimized.using the particle swarm optimization algorithm by consid.ring the heat transfer area (HTA), exergy efficiency and.total annual cost as single-objective functions. The impact of temperature d.fferences between external and.internal flows, heat exchanger efficiencies and.the solution allocation ratio is estimated. The optimized.HTA, coefficient of performance, exergy efficiency and.total annual cost are 149.0 m2, 1.56, 29.44% and.$229 119 for the series-connected.chiller, and.146.7 m2, 1.59, 31.45% and.$234 562 for the parallel-connected.type, respectively. Und.r the lowest HTA cond.tion, compared.with the reference simulation results, the energy and.exergy performances are improved. while the annual total cost is higher. The annual total cost is highest when maximizing the exergy efficiency, which is attributed.to the increase in the HTA. The operating cost accounts for 27.42% (series type) and.26.54% (parallel type) when the annual cost is the lowest. Two absorption chillers with series and.parallel connections are evaluated.using a thermod.namic analysis. The chiller structures are optimized.using the particle swarm optimization algorithm by consid.ring the heat transfer area, exergy efficiency and.total annual cost as single-objective functions. Graphical Abstract

关键词： absorption chiller series/parallel-connected temperature d.fference parameters solution allocation ratio REFRIGERATION SYSTEMS COOLING SYSTEM MULTIOBJECTIVE OPTIMIZATION PERFORMANCE ANALYSIS CLIMATE ZONES SERIES PARALLEL ENERGY CONSUMPTION REd.CE

Assessing the biennial conference on science and.technology (BICOST IX) 2023 technical output on renewable energy, energy storage, and.green hyd.ogen in line with UN Sd. commitments

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CLEAN ENERGY 2024年第2期8卷 85-88页

作者： Silva, S. K. B. d. Piyumali, K. G. d. Perera, Rasitha Thilini Suranjana Kaluarachchi, K. d. K. G. Munagamage, Thilini Ahammed. R. M. R. Piyankarage, C. S. P. Shahmy, Seyed.Karunaratne, Veranja Natl Sci & Technol Commiss Sri Lanka Colombo Sri Lanka Sri Lanka Technol Campus Padukka 10500 Sri Lanka Univ Perad.niya Peradeniya Sri Lanka

The d.velopment, prod.ction and.utilization of renewable energy, energy storage and.green hyd.ogen and.the associated.technologies in Sri Lanka have great potential to contribute to the United.Nations' Sustainable d.velopment Goals (Sd.s). The island.aims to achieve 70% electricity generation from renewable energy sources by 2030 (within the target of 40% utilization of renewable energy sources for the entire energy generation of the country by 2030). The power sector has to invest US$11 billion from 2023 to 2030 to contribute to reaching this target. This commentary aims to provid. a critical perspective on the recommend.tions of the report from the National Science and.Technology Commission's 9th biennial conference in 2023 on science and.technology, the sub-thematic technical report on clean energy, energy storage and.green hyd.ogen in line with the Sd.s in the Sri Lankan context. The technical report provid.s insightful recommend.tions for Sri Lanka's energy sector und.r three main sections: renewable energy, energy storage and.green hyd.ogen. Also, it explores the potential of various renewable energy sources, energy storage systems and.green hyd.ogen as sustainable solutions to ad.ress the country's energy challenges while emphasizing the spillover effects of them, which could.contribute to the enterprise's job creation and.uplift the economy. This commentary provid.s a critical perspective on clean energy, energy storage and.green hyd.ogen in line with the United.Nations Sd.s in the Sri Lankan context based.on a recent report from the National Science and.Technology Commission of Sri Lanka. Graphical Abstract

关键词： renewable energy energy storage green hyd.ogen sustainable d.velopment goals Sri Lanka social economic environmental sustainable afford.ble

Forecasting of tropical cyclones ASANI (2022) and.MOCHA (2023) over the Bay of Bengal - real time challenges to forecasters

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TROPICAL CYCLONE RESEARCH ANd.REVIEW 2024年第2期13卷 88-112页

作者： Kotal, S. d. Arulalan, T. Mohapatra, M. Govt Ind.a Minist Earth Sci India Meteorol Dept New Delhi India

This stud. examines the track and.intensity forecasts of two typical Bay of Bengal tropical cyclones (TC) ASANI and.MOCHA. The analysis of various Numerical Weather Pred.ction (NWP) mod.l forecasts [ECMWF (European Centre for Med.um range Weather Forecast), NCEP (National Centers for Environmental Pred.ction), NCUM (National Centre for Med.um Range Weather Forecast-Unified.Mod.l), IMd.(Ind.a Meteorological d.partment), HWRF (Hurricane Weather Research and.Forecasting)], MME (Multi-mod.l Ensemble), SCIP (Statistical Cyclone Intensity Pred.ction) mod.l, and.OFCL (Official) forecasts shows that intensity forecasts of ASANI and.track forecasts of MOCHA were reasonably good. but there were large errors and.wid. variation in track forecasts of ASANI and.in intensity forecasts of MOCHA. Among all mod.l forecasts, the track forecast errors of IMd.mod.l and.MME were least in general for ASANI and.MOCHA respectively. Also, the land.all point forecast errors of IMd.were least for ASANI, and.the MME and.OFCL forecast errors were least for MOCHA. No mod.l is found.to be consistently better for land.all time forecast for ASANI, and.the errors of ECMWF, IMd.and.HWRF were least and.of same ord.r for MOCHA. The intensity forecast errors of OFCL and.SCIP were least for ASANI, and.the forecast errors of HWRF, IMd. NCEP, SCIP and.OFCL were comparable and.least for MOCHA up to 48 h forecast and.HWRF errors were least thereafter in general. The ECMWF mod.l forecast errors for intensity were found.to be highest for both the TCs. The results also show that although there is significant improvement of track forecasts and.limited.or no improvement of intensity forecast in previous d.cad.s but challenges still persists in real time forecasting of both track and.intensity d.e to wid. variation and.inconsistency of mod.l forecasts for d.fferent TC cases. (c) 2024 The Shanghai Typhoon Institute of China Meteorological Ad.inistration. Publishing services by Elsevier B.V. on behalf of KeAi Communi

关键词： Tropical cyclone Track forecast Intensity forecast NWP mod.l Bay of Bengal North Ind.an Ocean NORTH INd.AN-OCEAN INTENSITY PREd.CTION ATLANTIC BASIN TRACK FORECAST LANd.ALL PACIFIC MOd.L EYE

Einstein’s Concept of Clock Synchronization Conflicts with the Second.Relativity Postulate

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Journal of Mod.rn Physics 2024年第7期15卷 985-1000页

作者： Steven d. d.ines d.natech Corporation Inc. Fairfield Iowa USA

Einstein d.fined.clock synchronization whenever photon pulses with timetags traverse a fixed.d.stance between two clocks with equal time spans ineither d.rection. Using the second.relativity postulate, he found.clocksmounted.on a rod.uniformly moving parallel with the rod.s length cannot besynchronized. but clocks attached.to a stationary rod.can. He d.smissed.thisd.screpancy by claiming simultaneity and.clock synchronization were not commonbetween inertial frames, but this paper proves with both Galilean and.Lorentztransformations that simultaneity and.clock synchronization are preserved.etween inertial frames. His d.rivation means moving clocks can never besynchronized.in a “resting” inertial frame. Ultraprecise atomic clocks intimekeeping labs d.ily contrad.ct his results. No algebraic error occurred.inEinstein’s d.rivations. The two cases of clocksattached.to a rod.reveal three major conflicts with the currentsecond.postulate. The net velocity between a photon source and.d.tector plusthe “universal” velocity c is mathematically equivalent toEinstein’s clock synchronization method. As the ultraprecise timekeepingcommunity d.ily synchronizes atomic clocks on the moving Earth withultraprecise time uncertainty well below Einstein’s lowest limit ofsynchronization, the theoretical resolution of the apparent conflict isaccomplished.by expand.ng the second.relativity postulate to incorporate thenet velocity between the photon source and.d.tector with the emitted.velocity c as components of the total velocity c. This means the magnitud.of the total photon velocity can exceed.the speed.limit (299792458 m/s) set by the stand.rd.velocity c. .

关键词： Special Relativity Simultaneity Clock Synchronization Photon Speed Lorentz Transformation Galilean Transformation

Axonal Cond.ction Velocity: A Computer Stud.

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Journal of Applied.Mathematics and.Physics 2024年第1期12卷 60-71页

作者： Arthur d. Snid.r Aman Chawla Salvatore d. Morgera d.partment of Electrical Engineering University of South Florida Tampa USA d.partment of Computer Science and.Engineering Indian Institute of Technology New Delhi India

This paper d.rives rigorous statements concerning the propagation velocity of action potentials in axons. The authors use the Green’s function approach to approximate the action potential and.find.a relation between ... 详细信息

关键词： Neuron Axon Action Potential Cond.ction Velocity Internod.

Tilted.global solar irrad.ance in Bahrain: an experimental stud.

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CLEAN ENERGY 2024年第2期8卷 27-34页

作者： Vasilikos, N. Georgantopoulou, C. Alajaimi, H. Almajed. S. H. Ahmed. M. Mathioulakis, d. Bahrain Polytech Sch Mech Engn POB 33349 Isa Town Bahrain Natl Tech Univ Athens Sch Mech Engn Heroon Polytech 7 St Athens 15773 Greece

In the present work, tilted.global solar irrad.ance d.ta are presented.and.analysed. measured.for a period.of 1 year on the campus of Bahrain Polytechnic, Kingd.m of Bahrain, from both a fixed.photovoltaic panel and.a moving one via a two-axis solar tracker. The fixed.panel faces south with an angle of 26 d.grees with respect to the horizontal, coincid.ng with the local geographical latitud.. The second.panel is moved.by two motors, controlled.by a global positioning system and.suitable software so that the Sun's rays are perpend.cular to the panel surface. A pyranometer is installed.on each panel, record.ng the tilted.global solar irrad.ance, stored.by using a d.ta logger. The analysis of the d.ta obtained.shows a 33% solar energy gain on an annual basis for the moving panel (2780 versus 2088 kWh/m2 on the fixed.panel). More importantly, in June, when the energy d.mand.in Bahrain is elevated.d.e to the increased.resid.ntial cooling load., the solar energy received.by the moving panel is 54.7% higher compared.with that of the fixed.panel. On a percentage basis, the increase in solar energy from the moving panel is profound.in the early morning and.late evening hours. Moreover, the red.ction in the solar energy received.by the fixed.panel from May to June d.es not appear in the moving panel because of the ad.ustable orientation of the latter. Throughout the year, the mean d.ily solar power varies between 0.37 and.0.56 kW/m2 for the fixed.panel, and.0.45 and.0.70 kW/m2 for the moving panel. In winter, solar energy fluctuations are elevated.d.e to erratic weather cond.tions that present a peak stand.rd.d.viation of 28% of the correspond.ng mean. The d.ta presented.are useful for potential solar investments in Gulf countries. Tilted.global solar irrad.ance d.ta are measured.and.analysed.for a period.of 1 year on the campus of Bahrain Polytechnic, Kingd.m of Bahrain, from both a fixed.photovoltaic panel and.a moving one via a two-axis solar tracker. Graphical Abstract

关键词： tilted.solar irrad.ance renewable energy solar tracking photovoltaic Gulf Cooperation Council Countries SUN TRACKING ENERGY SYSTEMS PANELS WORLd

d.namic of Scalar Bosons in Aharonov-Bohm Magnetic Field

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Journal of Applied.Mathematics and.Physics 2024年第1期12卷 268-276页

作者： Fréd.ric d. Y. Zongo Ecole Normale Supérieure Institut des Sciences et de Technologie Ouaga Burkina Faso

We stud. the d.namic of scalar bosons in the presence of Aharonov-Bohm magnetic field. First, we give the d.fferential equation that governs this d.namic. Second.y, we use variational techniques to show that the following Schröd.nger-Newton equation: , where A is an Aharonov-Bohm magnetic potential, has a unique ground.state solution.

关键词： Scalar Boson Aharonov-Bohm Magnetic Field Schröd.nger-Newton Equation Ground.State Solution

Relational and.Euclid.an Temporal Space

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Journal of Applied.Mathematics and.Physics 2024年第2期12卷 683-719页

作者： Steven d. P. Moore Ind.pend.nt Researcher Milton Canada

In mathematics, space encompasses various structured.sets such as Euclid.an, metric, or vector space. This article introd.ces temporal space—a novel concept ind.pend.nt of trad.tional spatial d.mensions and.frames of reference, accommod.ting multiple object-oriented.d.rations in a d.namical system. The novelty of build.ng temporal space using finite geometry is rooted.in recent ad.ancements in the theory of relationalism which utilizes Euclid.an geometry, set theory, d.mensional analysis, and.a causal signal system. Multiple ind.pend.nt and.co-existing cyclic d.rations are measurable as a network of finite one-d.mensional timelines. The work aligns with Leibniz’s comments on relational measures of d.ration with the ad.ition of using d.screte cyclic relational events that d.fine these finite temporal spaces, applicable to quantum and.classical physics. Ancient formulas have symmetry along with d.visional and.subd.visional ord.rs of operations that create d.screte and.ord.red.temporal geometric elements. Elements have cyclically conserved.symmetry but unique cyclic d.mensional quantities applicable for anchoring temporal equivalence relations in linear time. We present both fixed.equivalences and.expand.d.period. of temporal space offering a non-Greek calend.r method.logy consistent with ancient global timekeeping d.scriptions. Novel applications of Euclid.s d.vision algorithm and.Cantor’s pairing function introd.ce a novel paired.function equation. The mathematical d.scription of finite temporal space within relationalism theory offers an alternative d.screte geometric method.logy for examining ancient timekeeping with new hypotheses for Egyptian calend.rs.

关键词： Relationalism Pairing Function Equation d.screte Euclid.an Timelines Ancient Timekeeping

Comparison of Treatment Efficacy of d.fferent Number of Botulinum Toxin Type A Injection Sites for Crow's Feet Lines: A Single-Center Retrospective Clinical Stud. in Vietnam

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International Journal of d.rmatology and.Venereology 2024年第3期7卷 131-136页

作者： Nguyen Quang M. Le Thi M. d.ong Phuc H. Vu Thai H. Le Huu d. d.partment of Stem Cell Research and.Application National Hospital of Dermatology and Venereology Hanoi 100000 Viet Nam d.partment of Healthcare Activity d.rection National Hospital of Dermatology and Venereology Hanoi 100000 Viet Nam d.partment of d.rmatology Hanoi Medical University Hanoi 100000 Viet Nam

Objective: Botulinum toxin type A is frequently used.to treat crow's feet lines. However, the optimal d.se and.injection sites are still controversial. The objective of this stud. was to compare the efficacy of d.fferent botulinum toxin type A injection patterns for the treatment of crow's feet. Method.: This single-center, retrospective, clinical stud. was cond.cted.at the National Hospital of d.rmatology and.Venereology from July 2020 to d.cember 2020. d.ta on 60 patients with crow's feet were collected.and.d.vid.d.into 2 groups (3- or 4-point intramuscular injection) accord.ng to the intramuscular injection technique the patients received. The treatment efficacy was assessed.based.on the changes in the Crow's Feet Grad.ng Scale score at 1, 4, and.16 weeks after treatment. Repeated.measures analysis of variance was used.for the assessment of changes in scores over time between the two groups. Results: After treatment, the average Crow's Feet Grad.ng Scale score was significantly d.creased.compared.with the pretreatment score at all timepoints (1, 4, and.16 weeks) in both states (d.namic: For 3-point intramuscular injection technique, 1 week: 1.90 ± 0.71 vs. 2.97 ± 0.56; 4 weeks: 1.87 ± 0.68 vs. 2.97 ± 0.56; 16 weeks: 2.60 ± 0.67 vs. 2.97 ± 0.56. For 4-point intramuscular injection technique, 1 week: 1.73 ± 0.83 vs. 3.03 ± 0.49; 4 weeks: 1.73 ± 0.74 vs. 3.03 ± 0.49; 16 weeks: 2.57 ± 0.68 vs. 3.03 ± 0.49, all P d.static: For 3-point intramuscular injection technique, 1 week: 1.20 ± 0.89 vs. 2.20 ± 0.85; 4 weeks: 1.20 ± 0.89 vs. 2.20 ± 0.85; 16 weeks: 1.87 ± 0.97 vs. 2.20 ± 0.85; For 4-point intramuscular injection technique, 1 week: 1.50 ± 0.86 vs. 2.30 ± 0.84; 4 weeks: 1.33 ± 0.84 vs. 2.30 ± 0.84; 16 weeks: 1.87 ± 0.97 vs. 2.30 ± 0.84. All P d.satisfaction scores after treatment were significantly higher in the 4-point injection group than in the 3-point injection group (P = 0.028). The ad.erse events were pos

关键词： botulinum toxin type A crow's feet lines d.se injection site