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汽车用铝合金热交换器(1)

轻合金加工技术 1991年第3期19卷 6-12页

作者： P.E.Fortin W.m.Kellermann m.j.Wheeler 周文标

本文评述了铝材在汽车热交换器中的应用前景。论讨了铝合金热交换器的种类和生产方法,重点介绍钎焊式和机械装配式两种热交换器的性能,尤其是抗腐蚀性能。

关键词：汽车铝合金热交换器

General Solution and Stability of Quattuordecic Functional Equation in Quasi β-Normed Spaces

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Advances in Pure mathematics 2016年第12期6卷 921-941页

作者： K. Ravi j. m. Rassias S. Pinelas S. Suresh Department of mathematics Sacred Heart College Tirupattur Tamil Nadu India Pedagogical Department E. E Section of Mathematics and Informatics National and Capodistrian University of Athens Athens Greece Departamen to de Cincias Exactas e Naturais Amadora Portugal Research and Development Centre Bharathiar University Coimbatore India

In this paper, we introduce the following quattuordecic functional equation f(x+7y)-14f(x+6y)+91f(x+5y)-364f(x+4y)+1001f(x+3y)-2002f(x+2y)+3003f(x+y)-3432f(x)+3003f(x-y)-2002f(x-2y)+1001f(x-3y)-364f(x-4y)+91f(x-5y)-14f(x-6y)+f(x-7y)=14!f(y), investigate the general solution and prove the stability of this quattuordecic functional equation in quasi β-normed spaces by using the fixed point method.

关键词： Quattuordecic Functional Equation Fixed Point method Hyers-Ulam Rassias Stability Quasi-β-Normed Space

Carbon Sequestration in Tropical Forest Stands: Its Control by Plant, Soil and Climatic Factors

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Open journal of Forestry 2016年第2期6卷 59-71页

作者： K. A. j. m. Kuruppuarachchi Gamini Seneviratne Buddhika D. madurapperuma Department of Botany The Open University of Sri Lanka Nawala Sri Lanka microbial Biotechnology Unit Institute of Fundamental Studies Sri Lanka Department of Environmental Science and management Humboldt State University Arcata CA USA

This study investigated the relationships amongst floristic, soil and climatic parameters and their control on carbon sequestration (CS) in two selected forest stands of Sri Lanka. Representative sampling sites were selected from the dry zone (Sigiriya forest sanctuary) and the wet zone (Udawattakele forest reserve) of Sri Lanka. Litter and soil samples were collected from each sampling site randomly in monthly intervals to cover an annual cycle. Plant biomass carbon stocks were calculated using standard biomass equations. Soil carbon stocks were determined by chemical oxidation and loss on ignition (LOI) methods. Principle Factor Analysis and multiple regression were used to quantify the relationships among the plants, soil and climatic variables. Plant biomass carbon stocks of the forests were governed by labile and stable C fractions, soil moisture, and plant diversity. The soil fulvic fraction acts as a focal point of interacting the variables such as soil N, free litter fraction (FLF) and humic fraction. During dry period in the dry zone forest, CS was governed by maximum relative humidity through an atmosphere-floor litter-soil continuum. Air temperature and FLF play a vital role in determining soil N. In addition, macIntosh distance (U) diversity index showed a significant positive relationship with soil N. The dry zone forests are seen to be more climatic sensitive and vulnerable than the wet zone forests in Sri Lanka due to influence of more climatic parameters that govern the soil organic carbon fractions.

关键词： Tropical Forests Carbon Sequestration Soil Organic Carbon

Lagged Coherence of Photon Emissions and Spectral Power Densities between the Cerebral Hemispheres of Human Subjects during Rest Conditions: Phase Shift and Quantum Possibilities

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World journal of Neuroscience 2016年第2期6卷 119-125页

作者： j. N. Costa B. T. Dotta m. A. Persinger Behavioural Neuroscience Program Laurentian University Sudbury Canada Biology Department Laurentian University Sudbury Canada Psychology Department Laurentian University Sudbury Canada Biomolecular Sciences Program Laurentian University Sudbury Canada

Photon counts about 15 cm from the left and right sides of the head while subjects sat quietly during baseline conditions within a hyper-dark chamber were measured by photomultiplier units. Lag/lead analyses for photon emissions between the two hemispheres indicated a weak but statistically significant correlation between the amplitude fluctuations that were separated by about 800 to 900 ms. Analyses of the spectral power densities of photon amplitude variations from the left and right hemispheres revealed peak values between 2 and 3 Hz which were equivalent to a difference of about 900 ms. The radiant flux densities were estimated to be in the order of 10?12 W?m?2 and to include the equivalence of about 107 neurons. Our calculations, which accounted for the small magnitude of the strength of the interhemispheric coefficients, suggest that the coherence could be strongly correlated with processes associated with the unmyelinated axons with diameters between 400 to 800 nm, the visible wavelengths, within the corpus callosum. When the ratio of the phase shift was applied to the Aharanov-Bohm equation, the time required for a photon-related electron to be within a cerebral magnetic field was the same duration as a single orbit of an electron and a photon’s traversal latency across a neuronal plasma membrane. We suggest that the peak photon decoherence between the two cerebral hemispheres may reveal a neuronal-quanta substrate to the conditions associated with consciousness.

关键词： Biophotons Interhemispheric Correlations Imagination Human Brain Quantitative EEG (QEEG) Visualization Corpus Callosum Aharanov-Bohm Effect

Low temperature impact strength of heavy section ductile iron castings:effects of microstructure and chemical composition

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China Foundry 2011年第1期8卷 66-73页

作者： C.Labrecque P.m.Cabanne Rio Tinto Iron & Titanium (RTIT) Rio Tinto Iron &Titanium (RTIT)

A foundry research project has been recently initiated at RTIT in order to better understand the fabrication of as-cast heavy section DI parts meeting high impact energy requirements at low *** experimental castings have the following dimensions 180 mm x 180 mm x 190 *** achieved as-cast Charpy impact strengths were as follows:17 j (RT),16 j (-20℃) and 11 j (-40℃).The foundry process,the chemical composition and the microstructure of this experimental casting are compared to the ones of various examples in order to show the detrimental effects of residual elements,microshrinkage and microcarbide on the impact ***,quality index empirical models (based on casting chemical compositions) are used to analyse the impact tests *** paper illustrates that an adequate nodule count can contribute to reducing the detrimental effects of the residual elements and microsegregation.

关键词： heavy section ductile iron casting as-cast microstructure low temperature impact strength quality index ferritic ductile iron

The African Elephant (<i>Loxodonta africana</i>): mini-Review of an Endangered Species

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Natural Resources 2020年第8期11卷 317-350页

作者： Ana Raquel de Sales Rita Sofia Santos Anastácio m. j. Pereira Department of Biology University of Aveiro Aveiro Portugal Independent Researcher Aveiro Portugal

Humankind is responsible for conditioning the distribution of species, including the African elephant. From its great physical form to its fascinating social behaviour, Loxodonta africana can trigger an admiration in some and be undervalued by others, often ending up being a victim of human activities. Increasingly, the apparent impossibility of the coexistence of these two species represents a problem for the conservation of the large African mammal. Here it was reviewed the published bibliography about the African savannah elephant (L. africana), between July 2015 and December 2019. The Web of Science (WoS) database enabled the search for the words “Loxodonta africana”. From this research, we obtained 310 articles, 149 of them were analysed. Elephants have characteristics that define its uniqueness that are constantly reported, such as: its cognition and extraordinary memory, factors that influence its movements and its distribution, its specific vocalization and the strong dependence on social connections. Threats to the conservation of the species and the urgency of interventions are also an important subject of discussion. Poaching for ivory represents a major obstacle on conservation and has been drastically reducing the number of elephant populations and causing future consequences for those who thrive. Law enforcement in rmily:Verdana;">educing/prohibit po

关键词： Behaviour Ecosystem Engineer Environmental Awareness Human-Wildlife Conflict Loxodonta africana mitigation Strategies Poaching Wildlife Conservation

Emergency Cesarean Section in a COVID-19 Patient with Antepartum Hemorrhage: A Case Report

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Open journal of Anesthesiology 2022年第8期12卷 249-254页

作者： Tokunbo Olumide Olajumoke j. m. Olaitan Pbafolayan A. A. Adelekan A. Bello Department of Anaesthesia and Intensive Care LAUTECH Teaching Hospital Osogbo Nigeria

Introduction: Perioperative management of patients with corona virus disease 2019 (COVID-19) could be extremely challenging in order to keep the balance between providing optimal medical care and protecting health-care providers from the risk of infection. Also the respiratory effect of COVID 19 could also alter the course and outcome of surgery. Aim: We aim to report a 30-year-old COVID-19 patient who had emergency cesarean section on account of placenta praevia. methodology: The cesarean section was done under subarachnoid block while there was no significant event perioperatively while preventive measures were taken to avoid cross infection with the managing team. Results: The patient had a safe anesthesia and surgery. Polymerase Chain Reaction (PCR) test was done fourth day after surgery was negative for the mother and child.

关键词： Anesthesia Cesarean Section COVID-19

Innovative seismic retrofitting strategy of added stories isolation system

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Frontiers of Structural and Civil Engineering 2013年第1期7卷 13-23页

作者： min-Ho CHEY j.Geoffrey CHASE john B.mANDER Athol j.CARR School of Architecture&Art Yanbian University of Science&TechnologyYanji 133000China Department of mechanical Engineering University of CanterburyChristchurch 8140New Zealand Zachry Department of Civil Engineering Texas A&M UniversityTexas 77843USA Department of Civil&Natural Resources Engineering University of CanterburyChristchurch 8140New Zealand

The seismic performance of“added stories isolation”(ASI)systems are investigated for 12-story moment resisting *** newly added and isolated upper stories on the top of the existing structure are rolled to act as a large tuned mass damper(TmD)to overcome the limitation of the size of tuned mass,resulting to“12+2”and“12+4”stories building *** isolation layer,as a core design strategy,is optimally designed based on optimal TmD design principle,entailing the insertion of passive flexible laminated rubber bearings to segregate two or four upper stories from a conventionally constructed lower superstructure *** performance metrics are presented for 30 earthquake records from the 3 suites of the SAC *** history analyses are used to compute various response performances and reduction factors across a wide range of seismic hazard *** show that ASI systems can effectively manage seismic response for multi-degree-of freedom(mDOF)systems across a broader range of ground motions without requiring burdensome extra *** results include the identification of differences in the number of added story by which the suggested isolation systems remove energy.

关键词： added stories seismic isolation tuned mass damper parametric optimization statistical method

Brown Trout Redd Locations in the Northernmost Section of Spearfish Creek in Spearfish, South Dakota, USA

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Natural Resources 2022年第1期13卷 1-15页

作者： michael j. Robidoux jill m. Voorhees Abigail Domagall michael E. Barnes South Dakota Department of Game Fish and Parks McNenny State Fish Hatchery Spearfish South Dakota USA School of Natural Sciences Environmental Physical Science Black Hills State University Spearfish South Dakota USA

Salmonid fish are known to reproduce throughout the Black Hills in South Dakota, however, it is not known when or where they are spawning or how successful their spawning is. This study documented for the first-time brown trout (Salmo trutta) redd locations and redd construction timing in a 1.6 km reach of Spearfish Creek, within the northern most part of the city of Spearfish, South Dakota, USA in 2020. Redds were first observed on October 13, 2020, with observations continuing until November 17 when no new redds were spotted. Redd construction peaked during the first week of November, with 52 observed. A total of 146 redds was recorded over the course of the study, resulting in a density of 91 redds/km. This is the first study to document redds in this section of Spearfish Creek. These observations will allow for comparisons to future spawning activity which may be impacted by the increased urbanization likely along this section of the creek. Hopefully, mily:Verdana;">This study can also guide future research and habitat projects throughout this section of Spearfish Creek, and potentially throughout this region.

关键词： Brown Trout Redds Spawning Spearfish South Dakota