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Simulation and experiment of a photovoltaic—air source heat pump system with thermal energy storage for heating and domestic hot water supply

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Building Simulation 2023年第10期16卷 1897-1913页

作者： Junyu Da Ming Li Guoliang Li yunfeng wang Ying Zhang Solar Energy Research Institute Yunnan Normal UniversityNo.768Juxian StreetChenggong districtKunmingYunnan650500China

For China,the development of low-energy buildings is one of the necessary routes for achieving carbon *** photovoltaic(PV)with air source heat pump(ASHP)yields a great potential in providing heating and domestic hot water(DHW)supply in non-central heating ***,the diurnal and seasonal inconsistencies between solar availability and building heat load can severely affect the efficacy of solar energy *** study creates and numerically simulates a PV-ASHP system with thermal energy storage(TES)in transient system simulation software,*** studies are conducted to validate the simulation *** system’s yearly operational characteristics are simulated to reveal the energy conversion relationship between the system’s thermoelectric storage and heating and DHW *** results show that the synergy between heating and DHW simultaneously improves the direct utilization of solar energy compared to single *** yearly self-consumption and self-satisfaction rates of PV and the COP of the ASHP increase by 131.25%,10.53%and 9.56%,*** energy contributes 55.54%to the system,with a PV capacity of 82 W per square meter of building *** study provides fresh approaches to developing flexible building-integrated PV-ASHP technologies and balance of the energy exchange among the PV,building load and TES.

关键词： PV-ASHP TRNSYS heating and DHW thermal energy storage simulation and experiment

Experimental study of high to intermediate temperature alteration in porphyry copper systems and geological implications

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Science China Earth Sciences 2019年第3期62卷 550-570页

作者： Jianping LI Huayong CHEN Long SU Bing XIAO yunfeng wang Key Laboratory of Mineralogy and Metallogeny/Guangdong Provincial Key Laboratory of Mineral Physics and Materials Guangzhou Institute of Geochemistry Chinese Academy of Sciences University of Chinese Academy of Sciences Key Laboratory of Petroleum Resources Gansu Province/Key Laboratory of Petroleum Resources ResearchInstitute of Geology and Geophysics Chinese Academy of Sciences

Porphyry copper systems, which provide most of the world's copper resource, are commonly associated with characteristic concentric zonation of alteration and mineralization. In-depth knowledge of the distribution and transport mechanism of elements in the alteration zones is essential for understanding the ore-forming processes. We employed flow-reaction apparatus to simulate the fluid-rock interactions during porphyry ore formation so as to investigate the mechanisms that govern the transport of elements and the development of zonation. The results indicate more heterogeneous distribution of elements in the experimental products at 450°C compared to those at lower temperatures, which implies a crucial role of temperature in controlling elements redistribution in hydrothermal systems. Heating advances potassic alteration and Ca leaching of wall *** achieve the same degree of sodic alteration, it requires a higher concentration of Na+in the fluid toward higher *** also facilitates the incorporation of Ti, Sr and Pb into silicate minerals through cation substitution. We infer from experimental results that from the center of intermediate to mafic volcanic wall rocks toward periphery, the contents of K and Ti should decrease and the contents of Ca, Zn and Mn should increase, whereas the trend for Si and Na could be *** study provides experimental and theoretical insights into a variety of vital geological observations, including anhydrite formation and the widespread development of potassic rather than sodic alteration in porphyry copper deposits.

关键词： Porphyry copper deposit Fluid-rock interactions Flowing systems Elements transport mechanism

Characterization of Nutrients,Heavy Metals,Petroleum and Their Impact on Phytoplankton in Laizhou Bay:Implications for Environmental Management and Monitoring

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Journal of Ocean University of China 2024年第3期23卷 822-834页

作者： wang Kai ZHAO Linlin ZHU Yugui YANG Liqiang wang yunfeng HONG Xuguang College of Marine Life Science Ocean University of ChinaQingdao 266003China First Institute of Oceanography Ministry of Natural ResourcesQingdao 266061China College of Fisheries Ocean University of ChinaQingdao 266003China Institute of Oceanology Chinese Academy of SciencesQingdao 266071China Southern Marine Science and Engineering Guangdong Laboratory Guangzhou 511458China

The Laizhou Bay(LB)represents a substantial ecological area that is vulnerable to human activities and confronts diverse environmental *** study provides a comprehensive characterization of nutrients,petroleum,heavy metals,and phytoplankton community structure across seven distinct areas in *** results indicate relatively high concentrations of NO_(2)-N,SiO_(4)-Si,and NO_(3)-N in the Southwest Laizhou Bay(SWLB)and Huanghe River Estuary(HRE).In contrast,the East Laizhou bay(ELB)and the North of Huanghe River Estuary(NHRE)exhibit the highest concentrations of heavy metals(As,Cr and Hg).The areas with high phytoplankton density and community diversity are mainly located in the *** adjusting for basic environmental factors,phytoplankton density and Margalef richness index D are significantly associated with nutrients(NO_(3)-N,NO_(2)-N,NH_(4)-N,SiO_(4)-Si),and heavy metal(Cr)*** highlight that,in addition to Xiaoqinghe River,nutrients brought by the Mihe River in the SWLB and heavy metal(Cr)pollution in the ELB resulting from industrial and mining activities along the coast significantly influence phytoplankton growth and community ***,it is recommended that more monitoring and management efforts be focused on these regions in the future.

关键词： Huanghe River Estuary Laizhou Bay nutrients heavy metals phytoplankton biodiversity

Ca^(2+)-calpains axis regulates Yki stability and activity in Drosophila

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Journal of Genetics and Genomics 2024年第10期51卷 1020-1029页

作者： Chaojun Zhai yunfeng wang Shenao Qi Muhan Yang Shian Wu The State Key Laboratory of Medicinal Chemical Biology Tianjin Key Laboratory ofProtein SciencesCollege of Life SciencesNankai UniversityTianjin 300071China

Yorkie(Yki)is a key effector of the Hippo pathway that activates the expression of targets by associating with the transcription factor *** upstream signals,such as cell polarity and mechanical cues,control transcriptional programs by regulating Yki *** for Yki regulatory factors has far-reaching significance for studying the Hippo pathway in development and human *** this study,we identify Calpain-A(CalpA)and Calpain-B(CalpB),two calcium(Ca^(2+))-dependent modulatory proteases of the calpain family,as critical regulators of Yki in Drosophila that interact with Yki,***^(2+)induces Yki cleavage in a CalpA/CalpB-dependent manner,and the protease activity of CalpA/CalpB is pivotal for the ***,overexpression of CalpA or CalpB in Drosophila partially restores the large wing phenotype caused by Yki overexpression,and F98 of Yki is an important cleavage site by the Ca^(2+)-calpains *** study uncovers a unique mechanism whereby the Ca^(2+)-calpain axis modulates Yki activity throughprotein cleavage.

关键词： CalpA CalpB Calcium Hippo pathway Yki Drosophila

Cooling rate controlled basal precipitates and age hardening response of solid-soluted Mg-Gd-Er-Zn-Zr alloy

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Journal of Magnesium and Alloys 2021年第4期9卷 1267-1277页

作者： Jinlong Fu Wenbo Du Linyue Jia yunfeng wang Xunming Zhu Xian Du Faculty of Materials and Manufacturing Beijing University of TechnologyBeijing 100124China Weihai Wanfeng Magnesium S&T Development Co.LTD 264200China

The precipitation and age hardening response of the solid-soluted Mg–10Gd–1Er–1Zn–0.6Zr(wt.%)alloy performed by water-quenching(QC),air-cooling(AC)and furnace-cooling(FC)in terms of the volume fraction of precipitates and tensile properties were investigated in present *** indicated the solid-soluted alloy contained stacking faults(SFs)and long period stacking ordered(LPSO)phase on the basal planes regardless of the cooling rate,but a larger volume fraction of the LPSO phase was formed with decreasing in the cooling *** aging,βandβ1 phases precipitated on the prismatic planes,and their number density decreased but mean particle size increased with decreasing in the cooling *** solid-soluted alloys(QC,AC and FC samples)showed no apparent difference in yield strength(YS),but their correspondent peak-aged alloys exhibited sharp difference in hardening *** strongest hardening response took place in the QC sample and showed 82MPa enhancement in YS,which was much larger than that of AC(+26MPa)and FC samples(+5MPa).The reason lies in that the higher cooling rate promotes the precipitation and reduces the average size ofβprecipitate.A novel cooling-rate controlled precipitation model with respect to the correlation of precipitates on basal and prismatic planes was *** this model,the basal precipitates showed a restrictive effect on the growth and/or coarsening ofβprecipitate,and composite precipitates containing theβphase with fine size as well as high area-number density and lower volume fraction of the LPSO phase are preferred to strengthen the Mg–10Gd–1Er–1Zn–0.6Zr alloy.

关键词： Magnesium alloy Long period stacking ordered(LPSO) Stacking faults(SFs) Cooling rate Tensile properties

Increased diversity and environmental threat of harmful algal blooms in the Southern Yellow Sea,China

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Journal of Oceanology and Limnology 2022年第6期40卷 2107-2119页

作者： Minjie SONG Tian YAN Fanzhou KONG yunfeng wang Mingjiang ZHOU CAS Key Laboratory of Marine Ecology and Environmental Sciences Institute of OceanologyChinese Academy of SciencesQingdao 266071China Laboratory for Marine Ecology and Environmental Science Pilot National Laboratory for Marine Science and Technology(Qingdao)Qingdao 266237China University of Chinese Academy of Sciences Beijing 100049China Center for Ocean Mega-Science Chinese Academy of SciencesQingdao 266071China

Harmful algal blooms(HABs)in the Southern Yellow Sea(SYS)have shown a trend of increasing diversity and detrimental ef *** the Bohai Sea,East China Sea,and South China Sea have experienced a high incidence of HABs since the 1980s,the Yellow Sea provides a relatively healthy ecological environment in which fewer HABs have been documented before the 21s t *** largescale blooms of the green macroalga Ulva prolifera(so-called“green tides”)have occurred annually since 2007 in the Yellow *** people were poisoned and one person died in Lianyungang in 2008 due to ingestion of algal ***,the Yellow Sea experienced co-occurrence of harmful red tides,green tides,and golden tides in *** combination of events,rare worldwide,indicates the potential for further deterioration of the marine environment in the Yellow Sea,which may be related to climate change,aquaculture,and other human *** the SYS as an example,we collected data of the frequency and scale of HABs over the years,as well as that of marine algal toxins,and analyzed the trend in the diversity of HABs in the SYS,to explore the causes and impacts of HABs,as well as the interrelationships among dif ferent types of HABs,including harmful red tides,green tides,and golden *** also attempted to improve our understanding of HAB evolution under the influence of global climate change and intensified human activities.

关键词： marine algal toxins harmful algal blooms red tides green tides golden tides Southern Yellow Sea

A new sequential data assimilation method

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Science China(Technological Sciences) 2009年第4期52卷 1027-1038页

作者： HAN YueQi ZHANG YaoCun wang yunfeng YE Song FANG HanXian Department of Atmospheric Sciences Nanjing UniversityNanjing 210093China Institute of Meteorology PLA University of Science and TechnologyNanjing 211101China Institute of Heavy Rain China Meteorological AdministrationWuhan 430074China

A new sequential data assimilation method named "Monte Carlo H ∞ filter" is introduced based on H ∞ filter technique and Monte Carlo method in this paper. This method applies to nonlinear systems in condition of lacking the statistical properties of observational errors. In order to compare the as- similation capability of Monte Carlo H ∞ filter with that of the ensemble Kalman filter (EnKF) in solving practical problems caused by temporal correlation or spatial correlation of observational errors, two numerical experiments are performed by using Lorenz (1963) system and shallow-water equations re- spectively. The result is that the assimilation capability of the new method is better than that of EnKF method. It is also shown that Monte Carlo H ∞ filter assimilation method is effective and suitable to nonlinear systems in that it does not depend on the statistical properties of observational errors and has better robustness than EnKF method when the statistical properties of observational errors are varying. In addition, for the new method, the smallest level factor founded by search method is flow-dependent.

关键词： sequential data assimilation Monte Carlo H∞ filter correlation of observational errors robustness flow-dependent

A binary-weighted 64-dB programmable gain amplifier with a DCOC and AB-class buffer

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Journal of Semiconductors 2012年第2期33卷 71-76页

作者： Ye Xiangyang wang yunfeng Zhang Haiying wang Qingpu School of Physics Shandong UniversityJinan 250100China Institute of Microelectronics Chinese Academy of SciencesBeijing 100029China

This paper designs a binary-weighted programmable gain amplifier（PGA） with a DC offset cancellation （DCOC） circuit and an AB-class output *** PGA adopts the circuit topology of a differential amplifier with diode-connected *** shows that the performance of the PGA is not sensitive to temperature and process *** to test results,controlled by a digital signal of six bits,the PGA can realize a dynamic gain of-2 to 61 dB,and a gain step of 1 dB with a step error within±0.38 *** minimum 3 dB bandwidth is 92 *** low-gain mode,IIP3 is 17 dBm,and a 1 dB compression point can reach 5.7 *** DCOC circuit enables the amplifier to be used in a direct-conversion receiver and the AB-class output buffer circuit reduces the overall static power consumption.

关键词： PGA DCOC AB class buffer binary-weighted

Molecular Scrippsiella phylogenetic analysis of dinoflagellate trochoidea isolated from the East Asianwaters

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Chinese Journal of Oceanology and Limnology 2010年第2期28卷 323-328页

作者： TANG Xianghai YURencheng ZHANG Qingchun wang yunfeng YAN Tian ZHOU Mingjiang Key Laboratory of Marine Ecology and Environmental Sciences Institute of Oceanology Chinese Academy of Sciences Qingdao 266071 China Graduate School of Chinese Academy of Sciences Beijing 100039 China

Previous studies found intraspecific diversity in Scrippsiella trochoidea A. R. Loeblich Ill, a widely distributed calcareous cyst-producing dinoflagellate. In this study, three strains （ST-I, ST-D6 and ST-K） of S. trochoidea isolated from the East Asian waters were studied, together with other geographical strains, to resolve their phylogenetic relationships. For the three East Asian isolates, two highly diverse regions of nuclear-encoded ribosomal DNA （rDNA）, the 5.8S rDNA and its flanking internal transcribed spacers 1 and 2, and the 5＇ portion of the large-subunit rDNA （encompassing the ＂DI＂ and ＂D2＂ domains） were sequenced. Homologous sequences from other geographical isolates were selected from the GenBank database and the phylogenetic relationships were inferred from the molecular data of these strains. Strains of S. trochoidea were found to cluster into three major clades （STR1, STR2 and STR3）, as reported in previous studies. Two of the three strains ST-1 and ST-K, were grouped in clade STR2, the other strain, ST-D6, belonged to clade STR3. The intraspecific diversity ofS. trochoidea in East Asian waters makes it necessary to carry out phylogenetic investigations in combination with data of biogeography, population dynamics, and life cycle on the ecophysiology of a region.

关键词： Serippsiella trochoidea phylogeny rDNA molecular systematics