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Seasonal thermal energy storage using natural structures:GIS-based potential assessment for northern China

Building Simulation 2024年第4期17卷 561-574页

作者： yichi zhang Jianjun Xia Midea HVAC Heating&Ventilation Equipment Co. LtdFoshan528311China Building Energy Research Center Tsinghua UniversityBeijing100084China

Seasonal thermal energy storage(STES)allows storing heat for long-term and thus promotes the shifting of waste heat resources from summer to winter to decarbonize the district heating(DH)systems.Despite being a promising solution for sustainable energy system,large-scale STES for urban regions is lacking due to the relatively high initial investment and extensive land use.To close the gap,this study assesses the potentials of using two naturally available structures for STES,namely valley and ground pit sites.Based on geographical information system(GIS)methods,the available locations are searched from digital elevation model and selected considering several criteria from land uses and construction difficulties.The costs of dams to impound the reservoir and the yielded storage capacities are then quantified to guide the choice of suitable sites.The assessment is conducted for the northern China where DH systems and significant seasonal differences of energy demand exist.In total,2,273 valley sites and 75 ground pit sites are finally identified with the energy storage capacity of 15.2 billion GJ,which is much larger than the existing DH demand in northern China.The results also prove that 682 valley sites can be achieved with a dam cost lower than 20 CNY/m^(3).By conducting sensitivity analysis on the design dam wall height and elevations,the choices of available natural structures are expanded but practical issues about water pressures and constructions are also found.Furthermore,the identified sites are geographically mapped with nearest urban regions to reveal their roles in the DH systems.In general,560 urban regions are found with potential STES units and most of them have STES storage capacities larger than their own DH demand.The novel planning methodology of this study and publicly available datasets create possibilities for the implementations of large-scale STES in urban DH systems.

关键词： seasonal thermal energy storage geographical information system district heating water reservoir

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Growth,leaf anatomy,and photosynthesis of cotton(Gossypium hirsutum L.)seedlings in response to four light-emitting diodes and high pressure sodium lamp

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Journal of Cotton Research 2024年第1期7卷 79-89页

作者： zhang yichi LIAO Baopeng LI Fangjun ENEJI AEgrinya DU Mingwei TIAN Xiaoli Engineering Research Center of Plant Growth Regulator Ministry of EducationCollege of Agronomy and BiotechnologyChina Agricultural UniversityBeijing 100193China Department of Soil Science Faculty of AgricultureForestryand Wildlife Resources ManagementUniversity of CalabarCalabarNigeria

Background Light is a critical factor in plant growth and development,particularly in controlled environments.Light-emitting diodes(LEDs)have become a reliable alternative to conventional high pressure sodium(HSP)lamps because they are more efficient and versatile in light sources.In contrast to well-known specialized LED light spectra for vegetables,the appropriate LED lights for crops such as cotton remain unknown.Results In this growth chamber study,we selected and compared four LED lights with varying percentages(26.44%–68.68%)of red light(R,600–700 nm),combined with other lights,for their effects on growth,leaf anatomy,and photosynthesis of cotton seedlings,using HSP lamp as a control.The total photosynthetic photon flux density(PPFD)was(215±2)μmol·m-2·s-1 for all LEDs and HSP lamp.The results showed significant differences in all tested parameters among lights,and the percentage of far red(FR,701–780 nm)within the range of 3.03%–11.86%was positively correlated with plant growth(characterized by leaf number and area,plant height,stem diameter,and total biomass),palisade layer thickness,photosynthesis rate(Pn),and stomatal conductance(Gs).The ratio of R/FR(4.445–11.497)negatively influenced the growth of cotton seedlings,and blue light(B)suppressed stem elongation but increased palisade cell length,chlorophyll content,and Pn.Conclusion The LED 2 was superior to other LED lights and HSP lamp.It had the highest ratio of FR within the total PPFD(11.86%)and the lowest ratio of R/FR(4.445).LED 2 may therefore be used to replace HPS lamp under controlled environments for the study of cotton at the seedling stage.

关键词： Cotton seedling Light-emitting diodes Biomass Palisade cell Photosynthesis

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Global Overview and Insights on Infodemiology and Infodemic Management

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China CDC weekly 2023年第26期5卷 579-583页

作者： Mingfan Pang yichi zhang Siyue Guo Xinping Yang Xiaopeng Qi Center for Global Public Health Chinese Center for Disease Control and PreventionBeijingChina

The coronavirus disease 2019(COVID-19)pandemic has underscored the global challenge of managing infodemics.In a situation report published on February 2,2020,the World Health Organization(WHO)observed that the disease outbreak and response were accompanied by an extensive infodemic,complicating the process for individuals to identify trustworthy sources and obtain reliable guidances during such a critical period(1).

关键词： demic managing guidance

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A multistimuli-responsive fluorescent hydrogel based on a fluorescence response to macromolecular segmental motion

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Nano Research 2023年第10期16卷 12098-12105页

作者： Botian Li Bo Yan Jian Wang yichi zhang Ziyan Qiu Jundang Liang Qiong Zhou College of New Energy and Materials China University of PetroleumBeijing 102249China

Fluorescent hydrogels with fast and reversible responses have attracted extensive attention, and it remains a challenge to designmultistimuli-responsive fluorescent hydrogel through a facile and versatile method. Meanwhile, the segmental motion inhydrogels is of significance for the various functions of hydrogels such as chemical reactivity, self-healing, and mechanicalstrength, etc., however, it is difficult and complicated to in situ investigate the segmental motion under different conditions. In thiswork, a multistimuli-responsive fluorescent hydrogel was designed and fabricated by introducing a tetraphenylethylene (TPE)derivative as a nonaggregated crosslinker in the gel network. Since the intermolecular rotation of TPE at the crosslinking pointwas directly integrated with the dynamic conformational transition of the macromolecular network, the mobility of macromolecularsegments can be monitored by the fluorescence intensity of the hydrogel. The prepared hydrogel has promising fluorescenceresponses to temperature, pH, metal ions, and hydrogen bonding agents, and characterization of the fluorescence and the chainsegmental motion showed that the weaker the mobility of the network macromolecular chain is, the stronger the fluorescenceintensity is. Furthermore, due to the multistimuli-responsive fluorescence of the hydrogel, such fluorescent hydrogels can bedesigned as reversible patterning displays and biomimetic color/shape adjustable actuators, with various potential applications.

关键词： multistimuli response fluorescent hydrogel aggregation-induced emission(AIE) segment motion biomimetic actuator

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A grouting simulation method for quick-setting slurry in karst conduit:The sequential flow and solidification method

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Journal of Rock Mechanics and Geotechnical Engineering 2022年第2期14卷 423-435页

作者： Zhenhao Xu Dongdong Pan Shucai Li yichi zhang Zehua Bu Jie Liu Geotechnical and Structural Engineering Research Center Shandong UniversityJinan250061China

It is difficult to temporally and spatially track and characterize the slurry viscosity in flowing water during grouting simulation.In this study,a sequential flow and solidification(SFS)method considering the spatial-temporal evolution of slurry viscosity in flowing water in karst conduit is proposed.First,a time-dependent model for the threshold function of slurry viscosity is established.During the grouting process,the spatial-temporal evolution of slurry viscosity is revealed by tracking the diffusion behavior of the slurry injected at different times.This method is capable of describing the gradual solidification process of the slurry during grouting.Furthermore,a physical model of grouting in a karst conduit is developed.Second,the effectiveness of the SFS method in grouting simulation is verified by the experiment of grouting conduit in flowing water.The SFS method enables real-time monitoring of fluid velocity and pressure during grouting in flowing water and provides a feasible calculation method for revealing the grouting plugging mechanism in complex karst conduits at different engineering scales.In addition,it can be used to guide the design of grouting tests in flowing water,improve cost efficiency,and provide theoretical basis for optimizing grouting design and slurry selection.

关键词： Karst conduit Sequential flow and solidification(SFS) Quick-setting slurry Grouting simulation method Grouting in flowing water

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The Relationship between Students’ Anxiety and Internet Use Disorders: A Meta-Analysis

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International Journal of Mental Health Promotion 2023年第12期25卷 1323-1341页

作者： yichi zhang Yuxiang Feng Shan Hu Huiyong Fan College of Education Science Bohai UniversityJinzhou121013China

Theoretical models have predicted a positive association between anxiety and Internet use disorders.However,theﬁndings of previous studies are conﬂicting,with some reporting a positive association and others proposing no relationship between the two.To explore the true relationship between the two and analyze the reasons for the differences,100 primary studies involving 108,539 subjects were entered into a meta-analysis.The results showed that(1)there was a signiﬁcant positive correlation between students’anxiety and Internet use disorder(r=0.330);(2)the moderating effect of anxiety type was signiﬁcant.(3)The moderating effects of the measurement instrument for Internet use disorder,the measurement instrument for anxiety,the subject’s grade level,the subject’s region,and the type of publication were not signiﬁcant.The question of how the different anxiety types of students and IUD have different mechanisms of action needs to be further explored.

关键词： Students anxiety Internet use disorder meta-analysis

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Simulating the obstacle avoidance behavior day and night based on the visible-infrared MoS_(2)/Ge heterojunction field-effect phototransistor

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Nano Research 2023年第8期16卷 11296-11302页

作者： Zhao Han Bo Wang Jie You Qiancui zhang yichi zhang Tian Miao Ningning zhang Dongdong Lin Zuimin Jiang Renxu Jia Jincheng zhang Hui Guo Huiyong Hu Liming Wang Key Laboratory of Analog Integrated Circuits and Systems Ministry of EducationSchool of MicroelectronicsXidian UniversityXi’an 710071China Qian Xuesen Collaborative Research Center of Astrochemistry and Space Life Sciences Department of Microelectronic Science and EngineeringNingbo UniversityNingbo 315211China Department of Physics Fudan UniversityShanghai 200433China

The contradiction between the high number of visually handicapped people and the scarcity of guide dogs has stimulated the demand for electronic guide dogs(EGDs).Here,we demonstrate an EGD by leveraging piezoresistors on a MoS_(2)/Ge heterostructure for simultaneous pressure-sensing and optical-sensing functions.The device has excellent gating capability and exhibits large positive and negative photoresponses under visible(532 nm,182 A/W)and infrared(1550 nm,37 A/W)illumination.These characteristics allow the device to efficiently classify different obstacles at all times of day using pressure and light signals.The device reaches nearly 100%accuracy after 48 training sessions when used to classify frequent scenes.The device adopts passive and active detection modes during the day and night,respectively,which improves the battery life of the EGD.This work provides a significant reference for the future design of EGDs,which may help a greater number of visually impaired people by reducing the cost of such devices.

关键词： electronic guide dogs dual-band photodetection pressure and light synergy work round the clock

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Living donor liver transplantation combined with splenectomy in a child with Niemann-Pick disease type B:single-centre experience of perioperative anticoagulation regimen

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Hepatobiliary Surgery and Nutrition 2022年第3期11卷 498-501页

作者： Han Ding Jian Wang yichi zhang Shuai Zhao Bing Han Hao Cai Jinyang Gu Department of Transplantation Xinhua Hospital Affifiliated to Shanghai Jiao Tong University School of MedicineShanghaiChina

Niemann-Pick disease(NPD)is a rare and life-threatening disease caused by the deficiency of acid sphingomyelinase activity which is characterized by intracellular accumulation of sphingomyelin within multiple organs(1).At present,few non-surgical treatment options are available for NPD apart from enzyme replacement therapy and allogeneic hematopoietic stem cell transplantation.However,neither surgical nor alternative therapies can modify the progression of neurological disorders,which makes the prognosis of NPD except type B bleak(2).NPD type B(NPD-B),known as one visceral form of NPD,is usually clinically manifested as hepatosplenomegaly but without neurological symptoms.Notably,pulmonary parenchymal involvement secondary to the accumulation of sphingomyelin in alveoli is also a feature of NPD-B(3).Scattered reports(4)indicated that liver transplantation(LT)have shown some preliminary results for NPD-B.Owing to the effect of diseased spleen on operation field and pancytopenia associated with hypersplenism,splenectomy is always performed in conjunction with LT.However.

关键词： splenectomy spleen involvement

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Simulating tactile and visual multisensory behaviour in humans based on an MoS_(2) field effect transistor

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Nano Research 2023年第5期16卷 7405-7412页

作者： Jie You Liming Wang yichi zhang Dongdong Lin Bo Wang Zhao Han Ningning zhang Tian Miao Maliang Liu Zuimin Jiang Hui Guo Yimeng zhang Jincheng zhang Huiyong Hu Wide Bandgap Semiconductor Technology Disciplines State Key Laboratory School of Microelectronics Xidian UniversityXi’an 710071China Qian Xuesen Collaborative Research Center of Astrochemistry and Space Life Sciences Department of Microelectronic Science and EngineeringNingbo UniversityNingbo 315211China Department of Physics Fudan UniversityShanghai 200433China

A visual and tactile multisensory integrated system is essential for human walking due to the demand for real-time interactions between perception and action.Here,a piezoresistor and MoS_(2)field effect transistor are combined to construct an artificial integration nervous system to simulate perception and synaptic plasticity.The key characteristics of synaptic plasticity are successfully demonstrated by individual pressure signals,individual optical signals,the synergy of optical and pressure signals,which are based on the electron trapping–detrapping mechanism at the MoS_(2)/SiO_(2)interface.We demonstrate that perception under synergy is stronger than perception under optical or pressure signal alone,which is similar to a biological system.Moreover,various distinguishable motion scenarios(combination of the following conditions:external lighting environment of day or night,flat or rough road,movement state of walking or running)are simulated and verified by adjusting the amplitude and frequency of the optical and pressure signals.

关键词： visual tactile multisensory system motion scenarios

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Carbon nanotube fibers with excellent mechanical and electrical properties by structural realigning and densification

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Nano Research 2023年第11期16卷 12762-12771页

作者： Kunjie Wu Bin Wang Yutao Niu Wenjing Wang Cao Wu Tao Zhou Li Chen Xianghe Zhan Ziyao Wan Shan Wang Zhengpeng Yang yichi zhang Liwen zhang Yongyi zhang Zhenzhong Yong Muqiang Jian Qingwen Li Key Laboratory of Multifunctional Nanomaterials and Smart Systems Suzhou Institute of Nano-Tech and Nano-BionicsChinese Academy of SciencesSuzhou 215123China Division of Nanomaterials and Jiangxi Key Lab of Carbonene Materials Jiangxi Institute of NanotechnologyNanchang 330200China School of Nano-Tech and Nano-Bionics University of Science and Technology of ChinaHefei 230026China Henan Key Laboratory of Materials on Deep-Earth Engineering School of Materials Science and EngineeringHenan Polytechnic UniversityJiaozuo 454003China Beijing Graphene Institute(BGI) Beijing 100095China

Floating catalysis chemical vapor deposition(FCCVD)direct spinning process is an attractive method for fabrication of carbon nanotube fibers(CNTFs).However,the intrinsic structural defects,such as entanglement of the constituent carbon nanotubes(CNTs)and inter-tube gaps within the FCCVD CNTFs,hinder the enhancement of mechanical/electrical properties and the realization of practical applications of CNTFs.Therefore,achieving a comprehensive reassembly of CNTFs with both high alignment and dense packing is particularly crucial.Herein,an efficient reinforcing strategy for FCCVD CNTFs was developed,involving chlorosulfonic acid-assisted wet stretching for CNT realigning and mechanical rolling for densification.To reveal the intrinsic relationship between the microstructure and the mechanical/electrical properties of CNTFs,the microstructure evolution of the CNTFs was characterized by cross-sectional scanning electron microscopy(SEM),wide angle X-ray scattering(WAXS),polarized Raman spectroscopy and Brunauer–Emmett–Teller(BET)analysis.The results demonstrate that this strategy can improve the CNT alignment and eliminate the inter-tube voids in the CNTFs,which will lead to the decrease of mean distance between CNTs and increase of inter-tube contact area,resulting in the enhanced inter-tube van der Waals interactions.These microstructural evolutions are beneficial to the load transfer and electron transport between CNTs,and are the main cause of the significant enhancement of mechanical and electrical properties of the CNTFs.Specifically,the tensile strength,elastic modulus and electrical conductivity of the high-performance CNTFs are 7.67 GPa,230 GPa and 4.36×10^(6)S/m,respectively.It paves the way for further applications of CNTFs in high-end functional composites.

关键词： carbon nanotube fibers mechanical property electrical property alignment packing density

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