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Experimental Study on Thermal Properties and Light-to-Thermal Conversion Performance of Ionic Liquids Based Nanofluids

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Journal of Thermal Science 2023年第6期32卷 1956-1972页

作者： LIU Changhui SHI Xiancong gao ding CAO Yuqi GU Yanlong RAO Zhonghao School of Low-carbon Energy and Power Engineering China University of Mining and TechnologyXuzhou221116China School of Chemistry and Chemical Engineering Huazhong University of Science and TechnologyWuhan430074China School of Chemistry and Chemical Engineering The Key Laboratory for Green Processing of Chemical Engineering of Xinjiang BingtuanShihezi UniversityShihezi832003China School of Energy and Environmental Engineering Hebei University of TechnologyHebei300130China

As a new type of energy transport medium with high efficiency and high heat transfer performance,nanofluids have shown broad application prospects in the fields of thermodynamics,solar heat collection,microelectronics,thermal energy,and material *** wide liquid range and environmental properties of ionic liquids have drawn ample attention to their application when used as a working fluid,especially as a base solvent of *** ionic liquid-based nanofluids were prepared by a two-step method using 1-ethyl-3-methylimidazole trifluoroacetate ionic liquid as a base solvent and graphene oxide(GO)as a *** properties study reveals that the thermal conductivity could be enhanced by 3.0%with the addition of 0.05 wt%GO,and the viscosity and the specific heat capacity were also subject to study as a function of testing temperature and concentration of ***,the photothermal conversion efficiency of these nanofluids was studied comprehensively under different *** results show that the photothermal conversion efficiency can reach 83%within an irradiation time of 6000 s and the highest temperature of the nanofluids is up to 105.89℃with a maximum photothermal conversion efficiency increase by 29%.

关键词： nanofluids ionic liquid GO photothermal conversion

Ambient air temperature effects on the temperature of sewage sludge composting process

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Journal of Environmental Sciences 2005年第6期17卷 1004-1007页

作者： HUANG Qi-fei CHEN Tong-bin gao ding HUANG Ze-chun Chinese Research Academy of Environmental Sciences Beijing 100012 China Institute of Geographic Sciences and Natural Resources Research Chinese Academy of Sciences Beijing 100101 China

Using data obtained with a full-scale sewage sludge composting facility, this paper studied the effects of ambient air temperature on the composting temperature with varying volume ratios of sewage sludge and recycled compost to bulking agent. Two volume ratios were examined experimentally, 1 ： 0 ： 1 and 3 ： 1 ： 2. The results show that composting temperature was influenced by ambient air temperature and the influence was more significant when composting was in the temperature rising process： composting temperature changed 2.4-6.5℃ when ambient air temperature changed 13℃. On the other hand, the influence was not significant when composting was in the high-temperature and/or temperature falling process： composting temperature changed 0.75-1.3℃ when ambient air temperature changed 8-15℃. Hysteresis effect was observed in composting temperature＇s responses to ambient air temperature. When the ventilation capability of pile was excellent（at a volume ratio of 1：0：1）, the hysteresis time was short and ranging 1.1-1.2 h. On the contrary, when the proportion of added bulking agent was low, therefore less porosity in the substrate（at a volume ratio of 3：1：2）, the hysteresis time was IonQ and ranging 1.9-3.1 h.

关键词： sewage sludge composting ambient air temperature hysteresis

2022 Monkeypox outbreak:Why is it a public health emergency of international concern?What can we do to control it?

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World Journal of Clinical Cases 2022年第30期10卷 10873-10881页

作者： Shi-Yan Ren Jing Li Rong-ding gao Department of Laser and Vascular Surgery Aviation General HospitalChina Medical UniversityBeijing 100012China Department of Infectious Disease Aviation General HospitalChina Medical UniversityBeijing 100012China

The World Health Organization(WHO) called the recent monkeypox(MPX)outbreak a Public Health Emergency of International Concern on July 23,*** United States of America(US) alarmed the recent MPX outbreak as the US public health emergency on August 4,*** early May 2022,more than 35000 MPX cases and 12 deaths had been reported to WHO from 92 countries and territories by August 17,2022,and MPX cases continue rising rapidly with improved surveillance,access to diagnosis,and continuous virus spreading *** 99% MPX cases are men,of which 95% cases are men who have sex with *** evidence of MPX being sexually transmitted infections(STIs) is found;however,a high percentage(25%) of concurrent STIs and frequent anogenital symptoms suggest transmission through local inoculation during close intimate contact or sexual *** approaches including a comprehensive international vaccination strategy and adequate supplies are mandatory to prevent MPX ***,vaccination,MPX scrutiny and careful monitoring,and crossborder collaborations with international sectors are practical strategy to contain MPX *** are educated to reduce the risk of exposure and to reduce the number of sexual partners especially new ones,to avoid contacting travelers from epidemic regions or animals that may carry MPX virus,and avoid traveling to endemic areas.

关键词： Monkeypox Outbreak Public Health Emergency of International Concern vaccination Infectivity Transmission Man who have sex with man

Changes of Cu, Zn, and Cd speciation in sewage sludge during composting

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Journal of Environmental Sciences 2005年第6期17卷 957-961页

作者： gao ding ZHENG Guo-di CHEN Tong-bin LUO Wei gao Wei ZHANG Yi-an LI Yan-xia Center for Environmental Remediation Institute of Geographic Sciences and Natural Resources Research Chinese Academy of Sciences Beijing 100101 China

The potential toxicity risks from heavy metals depend on their chemical speciation. The four stages of the Tessier sequential extraction method were employed to investigate changes in heavy metal speciation （Cu, Zn, and Cd） of sewage sludge during forced aeration composting, and then to identify whether the composting process would reduce or enhance their toxicities. Throughout the composting process, the exchangeable, carbonate-bound, Fe-Mn oxide-bound, and organic matter-bound fractions of Cu were converted to the residual Cu fraction. The organic matter-bound Cu fraction greatly contributed to this transformation. Residual Zn fraction was transformed to the Fe-Mn oxide-bound and organic matter-bound fractions after composting. The residual Zn fraction was a major contributor to the organic matter-bound Zn fraction. The availability of Cu and Zn was reduced by composting such that the risk of heavy metal toxicity decreased with prolonged treatment times. Additionally, attention should be paid to the increased availability of Cd in sewage sludge after composting treatment.

关键词： composting distribution heavy metal sewage sludge speciation

Fear can be more harmful than the severe acute respiratory syndrome coronavirus 2 in controlling the corona virus disease 2019 epidemic

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World Journal of Clinical Cases 2020年第4期8卷 652-657页

作者： Shi-Yan Ren Rong-ding gao Ye-Lin Chen Vascular Surgery Department of General SurgeryAviation General HospitalChina Medical UniversityBeijing 100012China College of Robotics Beijing Union UniversityBeijing 100101China

The current corona virus disease 2019 outbreak caused by severe acute respiratory syndrome coronavirus 2 started in Wuhan,China in December 2019 and has put the world on *** safeguard Chinese citizens and to strengthen global health security,China has made great efforts to control the *** in the global community have joined China to limit the ***,discrimination and prejudice driven by fear or misinformation have been flowing globally,superseding evidence and jeopardizing the anti-severe acute respiratory syndrome coronavirus 2 *** analyze this phenomenon and its underlying causes and suggest practical solutions.

关键词： Coronavirus Severe acute respiratory syndrome Severe acute respiratory syndrome coronavirus 2 Coronavirus disease 2019 Outbreak Fear Discrimination Prejudice

Risk analysis of slope instability of levees under river sand mining conditions

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Water Science and Engineering 2012年第3期5卷 340-349页

作者： Zhuo-fu WANG Ji-yong ding gao-sheng YANG Institute of Engineering Management Hohai University Nanjing 211100 P. R. China

Levees are affected by over-exploitation of river sand and river adjustments after the formation of sand pits. The slope stability is seriously threatened, drawing wide concern among experts and scholars in the area of water conservancy. This study analyzed the uncertainties of slope stability of levees under river sand mining conditions, including uncertainty caused by interest- driven over-exploitation by sand mining contractors, and uncertainty of the distance from the slope or sand pit to the bottom of the levee under the action of cross-flow force after the sand pit forms. Based on the results of uncertainty analysis, the distribution and related parameters of these uncertainties were estimated according to the Yangtze River sand mining practice. A risk model of the slope instability of a levee under river sand mining conditions was built, and the possibility of slope instability under different slope gradients in a certain reach of the Yangtze River was calculated with the Monte Carlo method and probability combination method. The results indicated that the probability of instability risk rose from 2.38% to 4.74% as the pits came into being.

关键词： sand mining," levee risk analysis," slope instability," Monte Carlo method," probabilitycombination method

Assessing the health risk of heavy metals in vegetables to the general population in Beijing,China

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Journal of Environmental Sciences 2009年第12期21卷 1702-1709页

作者： SONG Bo LEI Mei CHEN Tongbin ZHENG Yuanming XIE Yunfeng LI Xiaoyan gao ding Center for Environmental Remediation Institute of Geographic Sciences and Natural Resources Research Chinese Academy of Sciences Beijing 100101 China Graduate University of Chinese Academy of Sciences Beijing 100039 China

A systematic survey of As, Cd, Cr, Cu, Ni, Pb and Zn concentrations in vegetables from 416 samples （involving 100 varieties） in Beijing was carried out for assessing the potential health risk to local inhabitants. The results indicated that the metal concentrations in vegetables ranged from 〈 0.001 to 0.479 μg/g fresh weight （fw）（As）, 〈 0.001 to 0.101 μg/g fw （Cd）, 〈 0.001 to 1.04 μg/g fw （Cr）, 0.024 to 8.25μg/g fw （Cu）, 0.001 to 1.689 μg/g fw （Ni）, 〈 0.001 to 0.655 μg/g fw （Pb） and 0.01 to 25.6 μg/g fw （Zn）, with average concentrations of 0.013, 0.010, 0.023, 0.51, 0.053, 0.046 and 2.55 μg/g fw, respectively. The results showed that the concentrations of As, Cr, Cu, Cd, Pb and Ni in vegetables from open-fields were all significantly higher than those grown in greenhouses. In addition, in local-produced vegetables, all HMs except Zn were significantly higher than those in provincial vegetables. The estimated daily intake （EDI） of As, Cd, Cr, Cu, Ni, Pb and Zn from vegetables was 0.080, 0.062, 0.142, 3.14, 0.327, 0.283 and 15.7 μg/（kg body weight （bw）.d） for adults, respectively. Arsenic was the major risk contributor for inhabitants since the target hazard quotient based on the weighted average concentration （THQw） of arsenic amounted to 44.3% of the total THQ （TTHQ） value according to average vegetable consumption. The TTHQ was lower than 1 for all age groups, indicating that it was still safe for the general population of Beijing to consume vegetables.

关键词： heavy metals health risk estimated daily intake Beijing vegetable

Fabrication of fire-retardant building materials via a hyper-crosslinking chemical conversion process from waste polystyrenes

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Energy and Built Environment 2022年第2期3卷 226-232页

作者： Changhui Liu Yuanhui Xie ding gao Xiancong Shi Zhonghao Rao School of Electrical and Power Engineering China University of Mining and TechnologyXuzhou 221116China

Polystyrene(PS)is rich in plastic materials,but it produces a large amount of waste every year,causing a huge burden on the *** PS plastic is the source of a common"white pollution"in daily life,it still has a high utilization *** the same time,the flammability of PS material determines that it cannot be applicated in places where fire accidents occur *** a result,its application has been greatly *** order to realize the efficient utilization of waste PS and broaden its scope of application,PS was modified by hyper-crosslinking in order to improve its fire-retardant *** this method,the PS solution with high purity was obtained by dissolving waste PS foam with 1,2-dichloroethane(DCE),and then the hyper-crosslinked polymer with high specific surface area was prepared by adding cross-linking agent formaldehyde dimethyl acetal(FDA)and a Lewis-acid catalyst ferric chloride(FeCl_(3)).Further studies showed that the effects of the amount of cross-linking agent FDA,catalyst FeCl_(3) and PS on the reaction products were *** addition,compared the as-prepared fire-retardant materials with PS foam from the aspects of flame retardancy and thermal insulation,it can be concluded that the fire-retardant performance of the materials prepared by this method has been significantly *** it is proved that this method is feasible towards the preparation of a large number of fire-retardant composite materials by using a scale-up experiment.

关键词： Waste polystyrene Building materials Fire-retardant Hyper-crosslinking High-value added utilization

Phlebosclerosis: An overlooked complication of varicose veins that affects clinical outcome: A case report

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World Journal of Clinical Cases 2023年第35期11卷 8404-8410页

作者： Shi-Yan Ren Song-Yi Qian Rong-ding gao Department of Laser and Vascular Surgery Aviation General HospitalBeijing 100012China Department of Cardiac Surgery Zhongshan Hospital(Xiamen Branch)Fudan UniversityXiamen 361015Fujian ProvinceChina

BACKGROUND Phlebosclerosis is a common age-related fibrotic degeneration of the venous *** is a disorder rather than a disease,which may cause venous dysfunction and even venous *** is rarely reported in patients with varicose *** SUMMARY The present report describes the case of a 70-year-old man with varicose veins,vitiligo,and *** angiography revealed blood reflux in the superficial and deep *** patient underwent surgery to remove the saphe-nous *** the operation,a calcified vein resembling a wooden stick was found,which was surprisingly extracted from the thickened venous wall.A cross-section of this wooden stick-like vein revealed venous fibrosis and calcification,obvious thickening of the venous wall,extensive collagen deposition on the venous wall,hyaline degeneration,and venous sclerosis causing closure of the venous *** This is probably the first report of a wooden stick-like structure being found in the venous wall in patients with varicose veins and venous *** can be observed in the late stage of varicose veins complicated by frequent infections and worse clinical ***,it is important to be aware of this condition and address it rather than overlook it.

关键词： Phlebosclerosis Varicose vein Phlebothrombosis Thrombophlebitis Calcification Ossification of vein wall Chronic venous disease Case report