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Catalytic Cracking of Polylactic Acid to Acrylic Acid

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Chinese Journal of Chemistry 2023年第17期41卷 2071-2076页

作者： Yuchen jiao meng wang Ding Ma Beijing National Laboratory for Molecular Sciences New Cornerstone Science LaboratoryCollege of Chemistry and Molecular EngineeringPeking UniversityBeijing 100871China

Comprehensive Summary,As a typical type of sustainable plastic,polyesters can be recycled or upcycled into value-added chemicals in a variety of ***,excess reagents are required for most of the depolymerization and upcycling processes,causing the emission of environmental pollutants and the waste of chemical *** we demonstrate a one-pot catalytic process to directly crack polylactic acid into acrylic acid by acid catalyst with the assistance of an ionic liquid,*** acid is attacked by the Br–from Bu4PBr and the H+from acid to form oligomers containing Br or acryloyl group,and these oligomers serve as intermediates to produce acrylic acid during their mutual *** acrylic acid is vaporized directly from the reactor and obtained in a collector with a selectivity around 90%when polylactic acid is fully *** green process shows great advantages in atom economy compared to the conventional recycling/upcycling methods for polyesters,in addition.

关键词： Polylactic acid Acrylic acid Atom economy Upcycling lonic liquid Commodity polymers Plastics Green chemistry

Comparative Studies on Wet Attaching Abilities of Different Salamander Species

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Journal of Bionic Engineering 2022年第1期19卷 92-102页

作者： meng Li Qing jiao Liping Shi Xiaolei wang Key Laboratory of Green Fabrication and Surface Technology of Advanced Metal Materials Ministry of EducationAnhui University of TechnologyMa’anshan243002China Anhui Province Key Laboratory of Special and Heavy Load Robot Anhui University of TechnologyMa’anshan243032China School of Mechanical Engineering Anhui University of TechnologyMa’anshan243032China College of Mechanical and Electrical Engineering Nanjing University of Aeronautics and AstronauticsNanjing210016China

Salamanders have evolved functions of attaching to a variety of surfaces under wet conditions,but racial diversity may cause a difference in attachment behaviors and epidermal *** sticking and climbing abilities of the Chinese Fire Belly Newt(CFBN),Chinese Warts Triton(CWT),Spotless Stout Newt(SSN),and Chinese Giant Salamander(CGS)on various surfaces were investigated and compared in terms of epidermal morphology,body size,and *** results indicate that the spotless stout newt has an excellent ability for wet attachment,compared to other salamanders under a certain contact case,resulting from its lower mass/body surface area and more visible epidermal *** with moderate water is beneficial for salamander attachment,and the surface roughness in the flood case also promotes the wet *** CFBN has the most hydrophilic epidermis among the samples,where the water droplet quickly spreads over,presenting a completely wetting *** study offers a comprehensive understanding of the wet attachments and the epidermal characteristics of salamanders,which is meaningful for the application of bioinspired adhesives.

关键词： Wet attachment Salamander Epidermal structure Wettability

旧城住区更新改造中提升公众参与有效性的路径研究

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工程管理学报 2018年第2期32卷 62-67页

作者：马辉黄梦娇王素贞天津城建大学经济与管理学院天津300384 天津城镇化与新农村建设研究中心天津300384

公众有效参与旧城住区更新改造有利于协调开发商、政府以及当地居民之间的关系,保障各方利益,避免冲突事件。针对旧城住区公众有效参与更新改造,从分析公众参与有效性的关键影响因素着手,系统分析参与主体和参与方式对旧城住区改造公众... 详细信息

公众有效参与旧城住区更新改造有利于协调开发商、政府以及当地居民之间的关系,保障各方利益,避免冲突事件。针对旧城住区公众有效参与更新改造,从分析公众参与有效性的关键影响因素着手,系统分析参与主体和参与方式对旧城住区改造公众参与的协同影响,深入揭露参与主体与参与方式之间的内在关联,建立先确定参与方式后确定参与主体的公众参与组织框架,并提出具体的实施路径。

关键词：旧城住区改造公众参与有效性参与主体参与方式

Existence and stability of invasion traveling waves for a competition system with random *** dispersals

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International Journal of Biomathematics 2019年第1期12卷 71-91页

作者： jiao wang Zhixian Yu Yanling meng College of Science University of Shanghai for Science and Technology Shanghai 200093 P.R.China Department of Mathematics Shanghai Normal University Shanghai 200234 P.R.China Business School University of Shanghai for Science and Technology Shanghai 200093 P.R.China

The purpose of this paper is to investigate asymptotic behaviors of the solutions for a competition system with random *** *** first prove the existence of invasion traveling waves via using the theory of asymptotic speeds of *** we prove the invasion traveling waves are exponentially stable as perturbation in some exponentially weighted spaces by using the weighted energy and the squeezing technique.

关键词： Existence stability competitive system comparison principle weighted energy

Near-infrared brain functional characteristics of mild cognitive impairment with sleep disorders

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World Journal of Psychiatry 2025年第1期15卷 106-116页

作者： Heng Liao Sha Liao Yu-jiao Gao Xi wang Li-Hong Guo Su Zheng Wu Yang Yi-Nan Dai Sleep Psychosomatic Medicine Center Taihe Hospital of Shiyan CityAffiliated Hospital of Hubei University of MedicineShiyan 442000Hubei ProvinceChina Department of Integrated Chinese and Western Medicine Taihe Hospital of Shiyan CityAffiliated Hospital of Hubei University of MedicineShiyan 442000Hubei ProvinceChina Department of Orthopaedics Taihe Hospital of Shiyan CityAffiliated Hospital of Hubei University of MedicineShiyan 442000Hubei ProvinceChina Department of Rehabilitation Taihe Hospital of Shiyan CityAffiliated Hospital of Hubei University of MedicineShiyan 442000Hubei ProvinceChina

BACKGROUND Mild cognitive impairment(MCI)has a high risk of progression to Alzheimer’s *** disease is often accompanied by sleep disorders,and whether sleep disorders have an effect on brain function in patients with MCI is *** To explore the near-infrared brain function characteristics of MCI with sleep *** A total of 120 patients with MCI(MCI group)and 50 healthy subjects(control group)were *** subjects underwent the functional near-infrared spec-troscopy *** baseline data,Mini-Mental State Examination,Montreal Cognitive Assessment scale,fatigue severity scale(FSS)score,sleep parameter,and oxyhemoglobin(Oxy-Hb)concentration and peak time of functional near-infrared spectroscopy test during the task *** relationship between Oxy-RESULTS Compared with the control group,the FSS score of the MCI group was higher(t=11.310),and the scores of Pittsburgh sleep quality index,sleep time,sleep efficiency,nocturnal sleep disturbance,and daytime dysfunction were higher(Z=-10.518,-10.368,-9.035,-10.661,-10.088).Subjective sleep quality and total sleep time scores were lower(Z=-11.592,-9.924).The sleep efficiency of the MCI group was lower,and the awakening frequency,rem sleep latency period,total sleep time,and oxygen desaturation index were higher(t=5.969,5.829,2.887,3.003,5.937).The Oxy-Hb concentration at T0,T1,and T2 in the MCI group was lower(t=14.940,11.280,5.721),and the peak time was higher(t=18.800,13.350,9.827).In MCI patients,the concentration of Oxy-Hb during T0 was negatively correlated with the scores of Pittsburgh sleep quality index,sleep time,total sleep time,and sleep efficiency(r=-0.611,-0.388,-0.563,-0.356).It was positively correlated with sleep efficiency and total sleep time(r=0.754,0.650),and negatively correlated with oxygen desaturation index(r=-0.561)and FSS score(r=-0.526).All comparisons were P<*** Patients with MCI and sleep disorders have lower near-infrared brain function than norm

关键词： Mild Cognitive impairment Sleep disorders Near-infrared Brain functional Characteristics

Analysis of a delayed diffusive model with Beddington-DeAngelis functional response

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International Journal of Biomathematics 2019年第4期12卷 277-300页

作者： Xin-You meng jiao-Guo wang School of Science Lanzhou University of Technology Lanzhou Gansu 730050 P. R.China

In this paper, a delayed diffusive phytoplankton-zooplankton model with Beddington DeAngelis functional response and toxins is investigated. Existence of equilibria of the system are solved. The global asymptotic stability of the zooplankton-free equilibrium is obtained. The local stability of the coexistent equilibrium and existence of Hopf bifurcation are discussed. In addition, the properties of the Hopf bifurcation are studied based on the center manifold and normal form theory for partial differential equations. Finally, some numerical simulations are also carried out to confirm our theoretical analysis.

关键词： Phytoplankton-zooplankton time delay stability Hopf bifurcation diffusive Beddington-DeAngelis

Comparison of human nasal epithelial cells grown as explant outgrowth cultures or dissociated tissue cultures in vitro

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Frontiers of Medicine 2013年第4期7卷 486-491页

作者： Jian jiao Na meng Hong wang Luo Zhang Department of Otolaryngology Head and Neck SurgeryBeijing Tongren HospitalCapital Medical UniversityBeijing 100005ChinaKey Laboratory of OtolaryngologyHead and Neck Surgery(Ministry of Education)Beijing Institute of OtolaryngologyBeijing 100005China

The purpose of this study was to compare cell growth characteristics,ciliated cell differentiation,and function of human nasal epithelial cells established as explant outgrowth cultures or dissociated tissue *** nasal mucosa of the uncinate process was obtained by endoscopy and epithelial cell cultures were established by explant outgrowth or dissociated tissue culture *** cell growth characteristics were observed by inverted phase contrast *** cell differentiation was detected byβ-tubulin IV and ZO-1 *** and ATP-stimulated ciliary beat frequency(CBF)was measured using a high-speed digital microscopic imaging *** the explant and dissociated tissue cultures established as monolayers with tight junctions and differentiated cell composition,with both types of cultures comprising ciliated and non-ciliated epithelial *** were also frequently found in explant cultures but rarely seen in dissociated tissue *** both culture systems,the highest ciliated cell density appeared at 7th–10th culture day and declined with time,with the lifespan of ciliated cells ranging from 14 to 21 ***,10%of the cells in explant cultures and 20%of the cells in the dissociated tissue cultures were *** two cultures demonstrated similar ciliary beat frequency values at baseline(7.78±1.99 Hz and 7.91±2.52 Hz,respectively)and reacted equivalently following stimulation with 100μM *** results of this study indicate that both the explant outgrowth and dissociated tissue culture techniques are suitable for growing well-differentiated nasal ciliated and non-ciliated cells,which have growth characteristics and ciliary activity similar to those of nasal epithelial cells in vivo.

关键词： ciliated cells ciliary beat frequency dissociated tissue culture explant culture nasal epithelial cells

Corn Yield Forecasting in Northeast China Using Remotely Sensed Spectral Indices and Crop Phenology Metrics

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Journal of Integrative Agriculture 2014年第7期13卷 1538-1545页

作者： wang meng TAO Fu-lu SHI Wen-jiao Institute of Geographical Sciences and Natural Resources Research Chinese Academy of Sciences University of Chinese Academy of Sciences

Early crop yield forecasting is important for food safety as well as large-scale food related planning. The phenology-adjusted spectral indices derived from Moderate Resolution Imaging Spectroradiometer （MODIS） data were used to develop liner regression models with the county-level corn yield data in Northeast China. We also compared the different spectral indices in predicting yield. The results showed that, using Enhanced Vegetation Index （EVI）, Normalized Difference Water Index （NDWI） and Land Surface Water Index （LSWI）, the best time to predict corn yields was 55-60 days after green-up date. LSWI showed the strongest correlation （R2=0.568）, followed by EVI （R2=0.497） and NDWI （R2=0.495）. The peak correlation between Wide Dynamic Range Vegetation Index （WDRVI） and yield was detected 85 days after green-up date （RZ=0.506）. The correlation was generally low for Normalized Difference Vegetation Index （NDVI）（R2=0.385） and no obvious peak correlation existed for NDVI. The coefficients of determination of the different spectral indices varied from year to year, which were greater in 2001 and 2004 than in other years. Leave-one-year-out approach was used to test the performance of the model. Normalized root mean square error （NRMSE） ranged from 7.3 to 16.9% for different spectral indices. Overall, our results showed that crop phenology-tuned spectral indices were feasible and helpful for regional corn yield forecasting.

关键词： remote sensing yield corn MODIS phenology

Aqueous oxytetracycline degradation and the toxicity change of degradation compounds in photoirradiation process

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Journal of Environmental Sciences 2008年第7期20卷 806-813页

作者： jiao Shaojun meng Shourong Yin Daqiang wang Lianhong Chen Liangyan Tongji Univ Minist State Educ Key Lab Yangtze Water Environm Shanghai 200092 Peoples R China Nanjing Univ Sch Environm State Key Lab Pollut Control & Resource Reuse Nanjing 210093 Peoples R China

The extensive use of antibiotics has been a worldwide environmental *** this study the fate of oxytetracycline (OTC),under photoirradiation,was *** results showed that OTC photolysis followed first order model *** photolysis rate was found to be dependent on the initial OTC concentration,with k value ranging from 0.0075 to 0.0141 min^(-1),in the OTC concentration from 40 to 10 mg/*** photolysis was highly pH-dependent and strongly enhanced at a high pH value,with a k value of...

关键词： antibiotics oxytetracycline photodegradation LC-ESl-MS toxicity