检索结果-南通市图书馆

CFD study of non-premixed swirling burners: Effect of turbulence models

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Chemical Engineering 2020年第4期28卷 1029-1038页

作者： Erfan Khodabandeh Hesam Moghadasi Mohsen Saffari Pour Mikael Ersson Par G.Jonsson marc a.rosen Alireza Rahbari Department of Mechanical Engineering Amirkabir University of TechnologyTehranIran School of Mechanical Engineering Department of Energy ConversionIran University of Sciesnce and Technology(IUST)Narmak 16846-13114TehranIran Department of Mechanical Engineering Shahid Bahonar University of KermanKermanIran Division of Processes Department of Materials Science and EngineeringKTH Royal Institute of TechnologyBrinellvägen 23SE-10044 StockholmSweden Faculty of Engineering and Applied Science University of Ontario Institute of TechnologyOshawaOntarioL1H 7K4Canada Department of Mechanical Engineering Shahid Rajaee Teacher Training University(SRTTU)TehranIran Research School of Engineering The Australian National UniversityCanberraACT 2601Australia

This research investigates a numerical simulation of swirling turbulent non-premixed *** effects on the combustion characteristics are examined with three turbulence models:namely as the Reynolds stress model,spectral turbulence analysis and Re-Normalization *** addition,the P-1 and discrete ordinate(DO)models are used to simulate the radiative heat transfer in this *** governing equations associated with the required boundary conditions are solved using the numerical *** accuracy of this model is validated with the published experimental data and the comparison elucidates that there is a reasonable agreement between the obtained values from this model and the corresponding experimental *** different models proposed in this research,the Reynolds stress model with the Probability Density Function(PDF)approach is more accurate(nearly up to 50%)than other turbulent models for a swirling flow *** the effect of radiative heat transfer model,it is observed that the discrete ordinate model is more precise than the P-1 model in anticipating the experimental *** model is able to simulate the subcritical nature of the isothermal flow as well as the size and shape of the internal recirculation induced by the swirl due to combustion.

关键词： Computational Fluid Dynamics(CFD) Turbulent combustion Non-premixed flames Large eddy simulations Radiative heat transfer model Modeling validation

用新的热电联产程序对燃气蒸汽发电厂的总效用整合(英文)

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Chemical Engineering 2014年第4期22卷 455-468页

作者： Sajad Khamis Abadi Mohammad Hasan Khoshgoftar Manesh marc a.rosen Majid Amidpour Mohammad Hosein Hamedi Department of Energy Engineering Science and Research Branch Islamic Azad University Department of Mechanical Engineering Faculty of Technology & Engineering University of Qom Faculty of Engineering and Applied Science University of Ontario Institute of Technology Faculty of Mechanical Engineering K. N. Toosi University of Technology

A steam power plant can work as a dual purpose plant for simultaneous production of steam and elec-trical power. In this paper we seek the optimum integration of a steam power plant as a source and a site utility sys-tem as a sink of steam and power. Estimation for the cogeneration potential prior to the design of a central utility system for site utility systems is vital to the targets for site fuel demand as well as heat and power production. In this regard, a new cogeneration targeting procedure is proposed for integration of a steam power plant and a site utility consisting of a process plant. The new methodology seeks the optimal integration based on a new cogenera-tion targeting scheme. In addition, a modified site utility grand composite curve(SUGCC) diagram is proposed and compared to the original SUGCC. A gas fired steam power plant and a process site utility is considered in a case study. The applicability of the developed procedure is tested against other design methods(STAR? and Thermoflex software) through a case study. The proposed method gives comparable results, and the targeting method is used for optimal integration of steam levels. Identifying optimal conditions of steam levels for integration is important in the design of utility systems, as the selection of steam levels in a steam power plant and site utility for integration greatly influences the potential for cogeneration and energy recovery. The integration of steam levels of the steam power plant and the site utility system in the case study demonstrates the usefulness of the method for reducing the overall energy consumption for the site.

关键词：燃气蒸汽热电联产程序使用发电厂集成蒸汽动力装置地盘优化整合

Transition metal carbides as cathode supports for PEM fuel cells

在线全文

学校读者我要写书评

暂无评论

Nano Research 2022年第12期15卷 10218-10233页

作者： Eliran R.Hamo Brian a.rosen Department of Materials Science and Engineering Tel Aviv UniversityRamat Aviv69987001Israel

As energy demands increase and environmental issues loom,fuel cells(FCs)have attracted significant attention as an alternative to conventional energy *** use encompasses portable applications,transportation,and a stationary grid-power mainly due to their low-temperature operation and quick ***,the primary challenge is improving fuel cell durability to meet 2025 *** of Energy targets(e.g.,8,000+h for automotive drive cycle).Proton exchange membrane fuel cell(PEMFC)catalysts currently suffer from low durability,undermining their wide-scale deployment into the consumer and industrial *** group metals(PGMs)are still the most common catalysts used in PEMFCs as they provide among the highest activity for electrode reactions and lifetime *** effective way to decrease Pt loading is the adoption of supports to enhance both Pt dispersion and its *** of the carbon-based support was identified to be the major contributor to performance degradation as they suffer from parasitic oxidation to CO_(2)(at the cathode).Therefore,there is a significant interest in exploring stable alternatives to replace carbon supports in *** metal carbides(TMCs)have attracted significant attention over the last several years as a possible candidate to replace carbon-based catalyst supports in fuel *** these advantages over carbon supports,the large-scale deployment of TMC-based supports in fuel cells is still hindered by concerns of durability at the high potential on the cathode during start-up and shutdown ***,we address the most relevant studies concerning TMCs as supports for acidic oxygen reduction reaction(ORR)catalysis,including viewpoints about the surface and bulk design of the support,as well as the design of the catalyst itself to enhance the interaction and dispersion with the support.

关键词： carbides fuel cells catalysis durability corrosion

Fundamentals and application in phytoremediation of an efficient arsenate reducing bacterium Pseudomonas putida ARS1

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Environmental Sciences 2024年第3期137卷 237-244页

作者： Ze-Wen Wang Guang Yang Jian Chen Yaoyu Zhou Avelino Nunez Delgado Hui-Ling Cui Gui-Lan Duan Barry P.rosen Yong-Guan Zhu Henan Institute of Advanced Technology Zhengzhou UniversityZhengzhou 450052China State Key Lab of Urban and Regional Ecology Research Center for Eco-Environmental SciencesChinese Academy of SciencesBeijing 100085China Department of Cellular Biology and Pharmacology Florida International UniversityHerbert Wertheim College of MedicineMiamiFL33199USA University of Chinese Academy of Sciences Beijing 100049China Key Laboratory of Urban Environment and Health Institute of Urban EnvironmentChinese Academy of SciencesXiamen 361021China College of Resources and Environment Hunan Agricultural UniversityChangsha 410128China Department of Soil Science and Agricultura Chemistry Engineering Polytechnic SchoolUniversity of Santiago de CompostelaCampus Univ.s/n27002LugoSpain

Arsenic is a ubiquitous environmental ***-mediated arsenic biotransformations significantly infuence arsenic mobility and *** transformations by soil and aquatic organisms have been well documented,while little is known regarding effects due to endophytic *** endophyte Pseudomonas putida ARS1 was isolated from rice grown in arsenic contaminated *** ARS1 shows high tolerance to arsenite(As(Ⅲ))and arsenate(As(V)),and exhibits efficient As(V)reduction and As(Ⅲ)effux *** exposed to 0.6 mg/L As(V),As(V)in the medium was completely converted to As(Ⅲ)by *** ARS1 within 4 *** sequencing showed that *** ARS1 has two chromosomal arsenic resistance gene clusters(arsRCBH)that contribute to efficient As(V)reduction and As(Ⅲ)effux,and result in high resistance to *** globosa is a strong arsenic accumulator with high potential for arsenic phytoremediation,which takes up As(Ⅲ)more efficiently than As(V).Co-culture of *** ARS1 and *** enhanced arsenic accumulation in *** by 69%,and resulted in 91%removal of arsenic(at initial concentration of 0.6 mg/L As(V))from water within 3 *** study provides a promising strategy for in situ arsenic phytoremediation through the cooperation of plant and endophytic bacterium.

关键词： Arsenic Pseudomonas putida Arsenate reduction Endophyte Wolffia globosa Phytoremediation

Erratum to “Identification of Novel Nonsense RPGR Variant Causing Mild X-Linked Cone-Rod Dystrophy and Myopia” [Case Reports in Clinical Medicine Volume 11 (2022) 422-434]

在线全文

学校读者我要写书评

暂无评论

Case Reports in Clinical Medicine 2024年第3期13卷 85-86页

作者： Kunka Kamenarova Sylvia Cherninkova Kalina Mihova.rosen Georgiev Yana Nikolaeva Radka Kaneva Molecular Medicine Center Department of Medical Chemistry and Biochemistry Medical Faculty Medical University—Sofia Sofia Bulgaria Laboratory of Genomic Diagnostics Department of Medical Chemistry and Biochemistry Medical Faculty Medical University—Sofia Sofia Bulgaria Clinic of Nervous diseases University Hospital “Alexandrovska” Sofia Bulgaria Clinic of Eye Diseases University Hospital “Alexandrovska” Sofia Bulgaria Eye Clinic “Vision” Sofia Bulgaria

The original online version of this article (Kamenarova, K., Cherninkova, S., Mihova, K., Georgiev, R., Nikolaeva, Y. and Kaneva, R. (2022) Identification of Novel Nonsense RPGR Variant Causing Mild X-Linked Cone-Rod Dystrophy and Myopia. Case Reports in Clinical Medicine, 11, 422-434. DOI: 10.4236/crcm.2022.1110059) unfortunately contains a mistake. The authors need to replace Figure 1.

关键词： Erratum

Evaluating the Efficacy of Cervical Tactile Ultrasound Technique as a Predictive Tool for Spontaneous Preterm Birth

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Open Journal of Obstetrics and Gynecology 2024年第5期14卷 832-846页

作者： Vladimir Egorov Todd rosen Jennifer Hill Meena Khandelwal Victors Kurtenoks Brendan Francy Noune Sarvazyan Advanced Tactile Imaging Inc. Ewing New Jersey USA Department of Obstetrics Gynecology and Reproductive Sciences Rutgers Robert Wood Johnson Medical School New Brunswick New Jersey USA Department of Maternal-Fetal Medicine Cooper Medical School of Rowan University Camden New Jersey USA

Background: Premature cervical softening and shortening may be considered an early mechanical failure that predispose to preterm birth. Purpose: This study aims to explore the applicability of an innovative cervical tactile ultrasound approach for predicting spontaneous preterm birth (sPTB). Materials and Methods: Eligible participants were women with low-risk singleton pregnancies in their second trimester, enrolled in this prospective observational study. A Cervix Monitor (CM) device was designed with a vaginal probe comprising four tactile sensors and a single ultrasound transducer operating at 5 MHz. The probe enabled the application of controllable pressure to the external cervical surface, facilitating the acquisition of stress-strain data from both anterior and posterior cervical sectors. Gestational age at delivery was recorded and compared against cervical elasticity. Results: CM examination data were analyzed for 127 women at 240/7 - 286/7 gestational weeks. sPTB was observed in 6.3% of the cases. The preterm group exhibited a lower average cervical stress-to-strain ratio (elasticity) of 0.70 ± 0.26 kPa/mm compared to the term group’s 1.63 ± 0.65 kPa/mm with a p-value of 1.1 × 10−4. Diagnostic accuracy for predicting spontaneous preterm birth based solely on cervical elasticity data was found to be 95.0% (95% CI, 88.5 - 100.0). Conclusion: These findings suggest that measuring cervical elasticity with the designed tactile ultrasound probe has the potential to predict spontaneous preterm birth in a cost-effective manner.

关键词： Cervical Elasticity Spontaneous Preterm Birth Tactile Ultrasound Probe

Finding stable multi-component materials by combining cluster expansion and crystal structure predictions

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

npj Computational Materials 2023年第1期9卷 2137-2146页

作者： Adam Carlsson Johanna.rosen Martin Dahlqvist Materials Design Department of PhysicsChemistryand Biology(IFM)Linköping UniversitySE-58183 LinköpingSweden

A desired prerequisite when performing a quantum mechanical calculation is to have an initial idea of the atomic positions within an approximate crystal *** atomic positions combined should result in a system located in,or close to,an energy ***,designing low-energy structures may be a challenging task when prior knowledge is scarce,specifically for large multi-component systems where the degrees of freedom are close to *** this paper,we propose a method for identification of low-energy crystal structures within multi-component systems by combining cluster expansion and crystal structure predictions with density-functional theory *** structure prediction searches are applied to the Mo_(2)AlB_(2) and Sc2AlB_(2) ternary systems to identify candidate structures,which are subsequently used to explore the quaternary(pseudo-binary)(Mo_(x)Sc_(1–x))2AlB_(2) system through the cluster expansion formalism utilizing the ground-state search ***,we show that utilizing low-energy structures found within the cluster expansion ground-state search as seed structures within crystal structure predictions of(Mo_(x)Sc_(1–x))2AlB_(2) can significantly reduce the computational *** this combined approach,we not only correctly identified the recently discovered Mo_(4/3)Sc_(2/3)AlB_(2) i-MAB phase,comprised of in-plane chemical ordering of Mo and Sc and with Al in a Kagomélattice,but also predict additional low-energy structures at various *** result demonstrates that combining crystal structure prediction with cluster expansion provides a path for identifying low-energy crystal structures in multi-component systems by employing the strengths from both frameworks.

关键词： structure cluster crystal

Colorless-to-colorful switching of electrochromic MXene by reversible ion insertion

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Nano Research 2022年第4期15卷 3587-3593页

作者： Jianxia Jiang Leiqiang Qin Joseph Halim Per O.Å.Persson Lintao Hou Johanna.rosen Guangzhou Key Laboratory of Vacuum Coating Technologies and New Energy Materials Physics DepartmentJinan UniversityGuangzhou 510632China Department of Physics Chemistry and Biology(IFM)Linköping UniversityLinköping SE-58183Sweden

Electrochromic(EC)materials that change color with voltage have been widely studied for use in dynamic ***,colorless-to-colorful switching with high contrast ratio is generically unattainable,especially for colorless-to-black electrochromic materials with an ultrahigh contrast ratio over the entire visible *** this work,we developed Nb_(1.33)C MXene-based dynamic windows with colorless-to-black switching of up to 75%reversible change in transmittance from 300 to 1,500 *** exploring the electrochromic effects of different electrolytes through in situ optical changes and electrochemical quartz crystal microbalance(EQCM),it is found that electrochromic behavior is greatly influenced by the extent of reversible Li^(+)insertion/deinsertion between the two-dimensional Nb_(1.33)C MXene *** addition,a colorless-to-black EC device based on Nb_(1.33)C with an overall integrated contrast ratio over 80%was successfully constructed by a solution-processable spin coating *** work enables a simple route to fabricate MXene-based high-performance electrochromic smart windows,which is important for further expanding the application of MXenes to optoelectronic and photonic applications.

关键词： MXenes electrochromic materials colorless-to-black switching high contrast ratio reversible Li^(+)insertion

Mathematical modelling of translational motion of rail-guided cart with suspended payload

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2007年第9期8卷 1395-1400页

作者： MITREV rosen Department of Engineering Logistics Material handling and Construction MachinesTechnical University of SofiaSofia 1000Bulgaria

In this paper modelling of the translational motion of transportation rail-guided cart with rope suspended payload is considered. The linearly moving cart,driven by a travel mechanism,is modelled as a discrete six degrees of freedom (DOF) dynamic system. The hoisting mechanism for lowering and lifting the payload is considered and is included in the dynamic model as one DOF system. Differential equations of motion of the cart elements are derived using Lagrangian dynamics and are solved for a set of real-life constant parameters of the cart. A two-sided interaction was observed between the swinging payload and the travel mechanism. Results for kinematical and force parameters of the system are obtained. A verification of the proposed model was conducted.

关键词：平移运动悬浮载荷摇动载荷数学建模