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Distributed Real-time Temperature and Energy Control of Energy Efficient Buildings via Geothermal Heat Pumps

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CSEE Journal of Power and Energy Systems 2023年第6期9卷 2289-2300页

作者： xiaotian wang Lei Liang Xuan Zhang Hongbin Sun Tsinghua-Berkeley Shenzhen Institute Tsinghua UniversityShenzhenChina Department of Electrical Engineering Tsinghua UniversityBeijingChina

Geothermal heat pumps(GHPs)are a type of heating ventilation and air conditioning(HVAC)systems that use low-temperature resources from soil and groundwater for heating/*** recent years,there has been an increasing interest in GHP systems due to their high energy efficiency and abundant geothermal ***,the optimization and control design of the GHP system has become a hot *** the other hand,as the GHP system is an ideal respon-sive load,mechanism design for the GHP system to realize demand response(DR)in a virtual power plant(VPP)without affecting user comfort is particularly *** this paper,we propose a distributed real-time temperature and energy management method via GHP systems for multi-buildings,where both floor and radiator heating/cooling distribution subsystems in multiple thermal zones are *** design an energy demand response mechanism for a single GHP to track the given energy consumption command for participating in VPP aggregation/***,a coordination mechanism for multiple GHPs is designed for the community-level oper-ator in joining VPP aggregation/*** designed schemes are scalable and do not need to measure or predict any exogenous disturbances such as outdoor temperature and heating disturbances from external sources,e.g.,user activity and device ***,four numerical examples for the simulation of two different scenarios demonstrate the effectiveness of the proposed methods.

关键词： Building temperature and energy management disaggregation distributed control GHP HVAC VPP

Facet-dependent activation of oxalic acid over hematite nanocrystals under the irradiation of visible light for efficient degradation of pollutants

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Journal of Environmental Sciences 2024年第8期142卷 204-214页

作者： Zhixiong Yang Yuan Li xiaotian wang Jiaming Li Jiquan wang Gaoke Zhang Hubei Key Laboratory of Mineral Resources Processing and Environment State Key Laboratory of Silicate Materials for ArchitecturesWuhan University of TechnologyWuhan 430070China Hubei Engineering Consulting Co. Ltd.Wuhan 430071China

Naturally occurring hematite has been widely studied in the Fenton-like system for water pollutant remediation due to its abundance and ***,its inadequate catalytic activity results in difficulty in effectively degrading pollutants in the catalytic degradation system that it ***,we constructed a photochemical system composed of hematite with{001}facet of high activity facet and low-cost and non-toxic oxalic acid(OA)for the removal of various types of *** removal rate for the degradation of metronidazole,tetracycline hydrochloride,Rhodamine B,and hexavalent chromium by hematite nanoplate with the exposed{001}facet activating OA under visible light irradiation was 4.75,2.25,2.33,and 2.74 times than that by the exposed{110}facet,*** functional theory(DFT)calculation proved that the OA molecule was more easily adsorbed on the{001}facet of hematite than that on the{110}facet,which would favor the formation of the more Fe(Ⅲ)-OA complex and reactive *** addition,the reactive site of metronidazole for the attraction of radicals was identified on the basis of the DFT calculation on the molecular occupied orbitals,and the possible degradation pathway for metronidazole included carbon chain fracture,hydroxyethyl-cleavage,denitrogenation,and ***,this finding may offer a valuable direction in designing an efficient iron-based catalyst based on facet engineering for the improved activity of Fenton-like systems such as OA activation.

关键词： Hematite Facet exposure Oxalic acid activation Fenton-like system Pollutant removal

A novel Cu_(1.5)Mn_(1.5)O_(4)photothermal catalyst with boosted surface lattice oxygen activation for efficiently photothermal mineralization of toluene

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Nano Research 2023年第2期16卷 2133-2141页

作者： Qiang Cheng Zhuangzhuang wang xiaotian wang Jiaming Li Yuan Li Gaoke Zhang Shenzhen Research Institute Hubei Key Laboratory of Mineral Resources Processing and EnvironmentState Key Laboratory of Silicate Materials for ArchitecturesWuhan University of TechnologyWuhan 430070China

Developing a novel photothermal catalyst for efficient mineralization of volatile organic compounds(VOCs)is of great significance to control air ***,for the first-time,a spinel Cu_(1.5)Mn_(1.5)O_(4)nanomaterial with enhanced surface lattice oxygen activation was successfully obtained by a novel light-driven in situ reconstruction strategy from its precursor(CuMnO_(2))for efficient toluene mineralization.X-ray diffraction(XRD)and high-resolution transmission electron microscopy(HRTEM)analyses confirm that the CuMnO_(2)phase was converted into spinel Cu1.5Mn1.5O4 phase under full spectrum light ***–visible–near infrared ray(UV–vis–NIR)spectroscopy,X-ray photoelectron spectroscopy(XPS)analysis,and density functional theory(DFT)calculations determine that the strong near-infrared absorption ability and low dissociation energy of oxygen bond in Cu_(1.5)Mn_(1.5)O_(4)are beneficial to its surface lattice oxygen ***,O2-temperature programmed desorption(TPD)and in situ diffuse reflectance infrared transform spectroscopy(DRIFTS)further indicate that the surface lattice oxygen of the Cu_(1.5)Mn_(1.5)O_(4)is easily activated under light irradiation,which can promote ring opening of *** research endows a new design of photothermal nanomaterial with enhanced lattice oxygen activation for deep oxidation of VOCs.

关键词： Cu_(1.5)Mn_(1.5)O_(4)nanomaterial surface lattice oxygen light-driven photothermal catalysis volatile organic compounds

A method for haplotype inference in general pedigrees without recombination

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Chinese Science Bulletin 2007年第4期52卷 471-476页

作者： wang ChunKao wang ZhiPeng QIU xiaotian ZHANG Qin Key Laboratory of Animal Genetics and Breeding of the Ministry of Agriculture State Key Laboratories of AgroBiotechnology College of Animal Science and Technology China Agricultural University Beijing 100094 China

The abundance of single nucleotide polymorphisms (SNPs) makes the haplotype-based method instead of single-maker-oriented method the main approach to association studies on QTL mapping. The key problem in haploptype-based method is how to reconstruct haplotypes from genotype data. Directly assaying haplotypes in diploid individuals by experimental methods is too expensive, therefore the in silico haplotyping-determination methods are the major choice at the present. This paper presents a rapid and reliable algorithm for haplotype reconstruction for tightly linked SNPs in general pedigrees. It is based on six rules and consists of three steps. First, the parental origins of alleles in offspring are assigned conditional on genotypes in parent-offspring trios; second, the redundant haplotypes are eliminated based on the six rules; and finally, the most likely haplotype combinations are chosen via maximum likelihood method. Our method was verified and compared with PEDPHASE by simulated data with different pedigree sizes, numbers of loci, and proportions of missing genotypes. The result shows that our algorithm was superior to PEDPHASE in terms of computing time and accuracy of haplotype estimation. The computing time for 100 runs was 10―15 times less and the accuracy was 4%―10% higher than PEDPHASE. The result also indicates that our method was very robust and was hardly affected by pedigree size, number of loci, and proportion of missing genotypes.

关键词：单核多态性单倍型干扰谱系非重组计算方法 QTL

Recent Advances of Amorphous Nanomaterials:Synthesis and Applications

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Chinese Journal of Chemistry 2024年第22期42卷 2853-2876页

作者： Lidong Li Hewei Zhao xiaotian wang Lin Guo Schoolof Chemistry Beihang UniversityBeijing 100191China

Comprehensive Summary Amorphous nanomaterials are metastable nanomaterials which only have short-range order within a few neighboring atoms,based on the local chemical *** from crystalline materials,the amorphous nanomaterials lack of long-range order exhibit many intriguing and unique structu ral features,such as abundant active sites,structural flexibility,intrinsic isotropy and fast ionic ***,due to the unco nventional structural complexity,the systematic study and understanding of amorphous nanomaterials are still in the early *** this review,we will describe our journey to the synthesis,characterization and applications of amorphous nanomaterials,including catalysis,energy storage,optics and mechanics.

关键词： Amorphous Nanomaterials Catalysis Energy storage Mechanics Amorphou structure Applications Synthesis design

Relationship between the geochemistry of organic matter and the generation of palygorskite in Jiangsu-Anhui border and Gansu Province,China

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Chinese Journal Of Geochemistry 2012年第3期31卷 340-346页

作者： CHEN Chuanping XU Yaping wang xiaotian JIN Yeling CHEN Jing Key Laboratory for Palygorskite Science and Applied Technology of Jiangsu Province Life Science and Chemical Engineering SchoolHuaiyin Institute of TechnologyHuai'an 223000China

Soluble organic matter had been separated from several palygorskite and bentonite samples in the Ji-angsu-Anhui border area(across Jiangsu Province and Anhui Province) and Linze County in Gansu Province of China and was analyzed with the techniques and methods of organic *** composition and distribution of hydrocarbons were analyzed by gas chromatography(GC).Organic stable carbon isotopic ratios(δ13C) in typical samples were *** abundance of soluble organic matter in all clay samples analyzed was *** Ji-angsu-Anhui samples,the preservation states of organic matter are different;hydrocarbons in organic matter have some features of aquatic plankton but are short of the input of terrigenous higher plants;organic δ13C in a palygor-skite of Yongxiaoshan in Xuyi County,Jiangsu Province,is-6.72‰.These features may be typical of a sedimentary environment of closed or semi-closed and relatively isolated different waters near coast or *** the contrary,in samples from Gansu,the preservation states of organic matter are good;the GC graphs of hydrocarbons show that the precursors of the organic matter are from a mixed source of aquatic organisms and land-sourced higher plants;organic δ13C of a palygorskite from Yangtai of Gansu is-15.62‰.It indicated that the sedimentary environment may be an inland salty *** results suggest that palygorskite minerals in the Jiangsu-Anhui area may be evolved from rapidly accumulated fine material or volcanic ash,but clays in Gansu Province may be transformed from terrigenous inorganic clastic components carried to the lake through river and then *** generation process of the samples studied in the paper seems to be related to salty water.

关键词：有机地球化学有机物质苏皖地区甘肃省坡缕石中国特征和有机质丰度

SIDEBANDS OF X-RAY DIFFRACTION IN AGE-HARDENED Cu-Ti ALLOY

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中国有色金属学会会刊：英文版 1996年第4期6卷 87-93页

作者： Wei Yinghui wang xiaotian(School of Materials Science and Engineering,Xi’an Jiaotong University,Xi’an 710049) XIAN JIAOTONG UNIV SCH MAT SCI & ENGNXIAN 710049PEOPLES R CHINA

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ＳＩＤＥＢＡＮＤＳＯＦＸ－ＲＡＹＤＩＦＦＲＡＣＴＩＯＮＩＮＡＧＥ－ＨＡＲＤＥＮＥＤＣｕ－ＴｉＡＬＬＯＹ￥ＷｅｉＹｉｎｇｈｕｉ；ＷａｎｇＸｉａｏｔｉａｎ（ＳｃｈｏｏｌｏｆＭａｔｅｒｉａｌｓＳｃｉｅｎｃｅａｎｄＥｎｇｉｎｅｅｒｉｎｇ，Ｘｉ＇ａｎＪｉａｏｔ...

关键词： Cu-Ti alloy X-ray diffraction sidebands static lattice wave theory

Smart design of high‐performance surface‐enhanced Raman scattering substrates

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SmartMat 2021年第4期2卷 466-487页

作者： Xiangyu Meng Lin Qiu Guangcheng Xi xiaotian wang Lin Guo School of Chemistry Beihang UniversityBeijingChina School of Energy and Environmental Engineering University of Science and Technology BeijingBeijingChina Institute of Industrial and Consumer Product Safety Chinese Academy of Inspection and QuarantineBeijingChina

Surface‐enhanced Raman scattering(SERS)spectroscopy has renowned its fame for the ultra‐high sensitivity and single‐molecule detection ability,and listed as a fingerprint spectrum representative in various trace detection *** efforts have been made by researchers to design high‐sensitive SERS‐active substrates ranging from noble metals to *** review summarizes the fundamental theories for SERS technique,that is,the electromagnetic enhancement mechanism and chemical enhancement mechanism and the state‐of‐the‐art design strategies for noble metal and semiconductor *** also sheds light on the effective approaches to improve the SERS activity for noble metal substrates,that is,tuning the localized surface plasmon resonance position,the assembling of hot spots,and precise controlling of *** charge transfer is considered as the main reason for the enhancement mechanism for semiconductors at the present stage,the underlying theoretical basis remains *** review summarized the critical points for SERS‐active substrates design and prospected the future development direction of SERS technology.

关键词： applications enhancement mechanisms SERS‐active nanomaterials smart substrate design

Experimental Characterization and Model Verification of Thermal Conductivity from Mesoporous to Macroporous SiOC Ceramics

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Journal of Thermal Science 2021年第2期30卷 465-476页

作者： QIU Lin DU Yanbo BAI Yangyang FENG Yanhui ZHANG Xinxin WU Jin wang xiaotian XU Caihong School of Energy and Environmental Engineering University of Science and Technology BeijingBeijing 100083China Beijing Key Laboratory of Energy Saving and Emission Reduction for Metallurgical Industry University of Science and Technology BeijingBeijing 100083China State Key Laboratory of Optoelectronic Materials and Technologies and the Guangdong Province Key Laboratory of Display Material and Technology School of Electronics and Information TechnologySun Yat-sen UniversityGuangzhou 510275China School of Chemistry Beihang UniversityBeijing 100191China Institute of Chemistry Chinese Academy of SciencesBeijing 100190China

Based on the chemical cross-linking method,this paper uses polydimethylsiloxane with various viscosities of 10 cSt,20 cSt,50 cSt,and 100 cSt to synthesize mesoporous and macroporous SiOC *** thermal conductivities are measured by using 3ωmethod with high *** typical models for their thermal conductivities,i.e.,series model(SM),maxwell-Eucken 1 model(ME1),and effective medium theory(EMT)model,are utilized to derive the empirical formula through the multi-parameter linear optimization algorithm,which agrees well with the experimental *** effects of pore size and specific surface area on the overall thermal conductivity of the porous structure are ***,it is found that the thermal conductivities of both gas phase and solid phase inside the porous structure increase with the increasing pore size at the nanometer scale,but the overall thermal conductivity of the porous structure decreases with the increasing pore *** electron microscopy graphs corroborate that the extension of the heat transfer route and the barrier of more pores between the solid phases together cause the reduction of the gas-solid coupling thermal conductivity of SiOC ceramics with larger pore *** the contrary,the miniaturization of individual particles through modulating the synthesis parameters can increase the number of small pores in the sample itself to meet the pseudo-lattice vibration conditions,which results in the increment of the gas-solid coupling thermal conductivity and the overall thermal conductivity of the porous *** findings would provide meaningful guidance for designing SiOC porous ceramic super-insulation materials with extremely low thermal conductivity.

关键词： SiOC ceramics macroporous media 3ωmethod thermal conductivity