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Highly Stereocontrolled Total Syntheses of Cedrane Sesquiterpenes via Cascade [5+2] Cycloaddition/Etherification

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Chinese Journal of Chemistry 2022年第2期40卷 183-189页

作者： yuhan zhang Zhiyong Chi Xiangxin Li Zhixiang Xie State Key Laboratory of Applied Organic Chemistry&College of Chemistry and Chemical Engineering Lanzhou University222 Tianshui South RoadLanzhouGansu 730000China

Cedrane sesquiterpenes possess common tricyclo[5.***.1.0^(1,5)]undecane core *** varied oxa-five-membered ring decorating their core structure to form 8-oxa-tetracyclo[7.***.2.0^(1,5).0^(6,13)]tridecane framework,containing six consecutive chiral centers(including two all-carbon quaternary centers and one oxygenated quaternary carbon center),has proven to be a synthetic challenge and a biosynthetic mystery to date.

关键词： Terpenoids Asymmetric synthesis Dehydrogenation Cascade[5+2]cycloaddition/etherification Protecting group-free

Dynamics of a family of rational maps concerning renormalization transformation

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Frontiers of Mathematics in China 2020年第4期15卷 807-833页

作者： yuhan zhang Junyang GAO Jianyong QIAO Qinghua WANG School of Science China University of Mining and TechnologyBeijing 100083China School of Science Beijing University of Posts and TelecommunicationsBeijing 100876China

Considering a family of rational maps Tnλconcerning renormalization transform ation,we give a perfect description about the dynamical properties of Tnλand the topological properties of the Fatou components F(Tnλ).F... 详细信息

关键词： Completely invariant domain quasi-circle Hausdorff dimension renormalization transformation

Ultimately Bounded Output Feedback Control for Networked Nonlinear Systems With Unreliable Communication Channel: A Buffer-Aided Strategy

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IEEE/CAA Journal of Automatica Sinica 2024年第7期11卷 1566-1578页

作者： yuhan zhang Zidong Wang Lei Zou Yun Chen Guoping Lu the College of Electrical Engineering and Automation Shandong University of Science and TechnologyQingdao 266590China IEEE the Department of Computer Science Brunel UniversityUB83PHUnited Kingdom the College of Information Science and Technology Donghua UniversityShanghai 201620 the Engineering Research Center of Digitalized Textile and Fashion Technology Ministry of EducationShanghai 201620China the School of Automation Hangzhou Dianzi UniversityHangzhou 310018China the School of Electrical Engineering Nantong UniversityNantong 226019China

This paper concerns ultimately bounded output-feedback control problems for networked systems with unknown nonlinear dynamics. Sensor-to-observer signal transmission is facilitated over networks that has communication *** transmissions are carried out over an unreliable communication channel. In order to enhance the utilization rate of measurement data, a buffer-aided strategy is novelly employed to store historical measurements when communication networks are inaccessible. Using the neural network technique, a novel observer-based controller is introduced to address effects of signal transmission behaviors and unknown nonlinear *** the application of stochastic analysis and Lyapunov stability, a joint framework is constructed for analyzing resultant system performance under the introduced controller. Subsequently, existence conditions for the desired output-feedback controller are delineated. The required parameters for the observerbased controller are then determined by resolving some specific matrix inequalities. Finally, a simulation example is showcased to confirm method efficacy.

关键词： Buffer-aided strategy neural networks nonlinear control output-feedback control unreliable communication channel

Mercury release behaviors of Guizhou bituminous coal during co-pyrolysis: Influence of chlorella

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Journal of Environmental Sciences 2022年第9期34卷 23-32页

作者： Huawei zhang Yifan Zhou Ting Liu Xiaopeng Tian yuhan zhang Juan Wang Mingzhu zhang Thipphasone Phoutthavong Peng Liang School of Environmental and Municipal Engineering Qingdao University of TechnologyQingdao 266033China College of Chemical and Biological Engineering Shandong University of Science and TechnologyQingdao 266590China Shanxi Institute of Industrial Standardization Taiyuan 030032China

Co-pyrolysis of coal and seaweed can not only effectively decrease the carbon footprint but also improve the quality and output of coal pyrolysis products,however,the influence of seaweed on thermal releasing behaviors of mercury during co-pyrolysis process are still *** this work,the chlorella and Guizhou bituminous coal were mixed and used to reveal the mercury release behavior during co-pyrolysis by the temperature programmed pyrolysis experiments,thermogravimetric and differential thermogravimetric analysis(TG-DTG)and thermogravimetry-mass spectrometry(TG-MS)methods,offering a sufficient explanation on the control technology of mercury pollutants in *** results exhibited that a large amount of reducing gases such as CO,H_(2) and H_(2)O were generated in chlorella at the temperature range of 100-500℃,which was favorable for the transformation from oxidized mercury to elemental mercury,thus remarkably increased the release of elemental mercury in the raw coal *** mixed chlorella also significantly lowered the decomposition temperature range(from 400-600 to 300-400℃)of pyrite-bound mercury and decreased the decomposition temperatures of the pyrite-bound mercury ***,in the copyrolysis about 91.82%of mercury was released into the gas phase below 400℃ and was 13.77% higher than that of in individual pyrolysis of coal.

关键词： Chlorella Coal Co-pyrolysis Mercury Release behavior

A Facile Li_(2)TiO_(3) Surface Modification to Improve the Structure Stability and Electrochemical Performance of Full Concentration Gradient Li-Rich Oxides

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Energy & Environmental Materials 2024年第3期7卷 41-48页

作者： Naifang Hu Yuan Yang Lin Li yuhan zhang Zhiwei Hu Lan zhang Jun Ma Guanglei Cui Qingdao Industrial Energy Storage Research Institute Qingdao Institute of Bioenergy and Bioprocess TechnologyChinese Academy of SciencesQingdao 266101China Institute of Materials Science and Engineering Ocean University of ChinaQingdao 266100China School of Future Technology University of Chinese Academy of SciencesBeijing 100049China Max Planck Institute for Chemical Physics of Solids Nothnitzer Strasse 40Dresden D-01187Germany CAS Key Laboratory of Green Process and Engineering Beijing Key Laboratory of Ionic Liquids Clean ProcessState Key Laboratory of Multiphase Complex SystemsInstitute of Process EngineeringChinese Academy of SciencesBeijing 100190China Shandong Energy Institute Qingdao 266101China

Full concentration gradient lithium-rich layered oxides are catching lots of interest as the next generation cathode for lithium-ion batteries due to their high discharge voltage,reduced voltage decay and enhanced rate performance,whereas the high lithium residues on its surface impairs the structure stability and long-term cycle ***,a facile multifunctional surface modification method is implemented to eliminate surface lithium residues of full concentration gradient lithium-rich layered oxides by a wet chemistry reaction with tetrabutyl titanate and the post-annealing *** realizes not only a stable Li_(2)TiO_(3)coating layer with 3D diffusion channels for fast Li^(+)ions transfer,but also dopes partial Ti^(4+)ions into the sub-surface region of full concentration gradient lithium-rich layered oxides to further strengthen its crystal ***,the modified full concentration gradient lithium-rich layered oxides exhibit improved structure stability,elevated thermal stability with decomposition temperature from 289.57℃to 321.72℃,and enhanced cycle performance(205.1 mAh g^(-1)after 150 cycles)with slowed voltage drop(1.67 mV per cycle).This work proposes a facile and integrated modification method to enhance the comprehensive performance of full concentration gradient lithium-rich layered oxides,which can facilitate its practical application for developing higher energy density lithium-ion batteries.

关键词： full concentration gradient lithium-rich layered oxides structure stability surface modification

Experimental evidence that cuckoos preferentially parasitize host nests early in their laying cycle

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Avian Research 2022年第3期13卷 328-331页

作者： Longwu Wang Gangbin He yuhan zhang Wei Liang William E.Feeney School of Life Sciences Guizhou Normal UniversityGuiyang550001China Ministry of Education Key Laboratory for Ecology of Tropical Islands Key Laboratory of Tropical Animal and Plant Ecology of Hainan ProvinceCollege of Life SciencesHainan Normal UniversityHaikou571158China Department of Behavioural Ecology and Evolutionary Genetics Max Planck Institute for OrnithologySeewiesen82319Germany Department of Biosciences Durham UniversityDurhamDH13LEUnited Kingdom

Brood parasites,such as the Common Cuckoo(Cuculus canorus),rely on manipulating hosts from other species to raise their *** should favor individuals that are able to identify and choose host nests that closely match the incubation stage of their own *** intuitive,and supported by the findings of numerous longterm monitoring studies,experimental evidence of this remains *** using video monitoring,we used three experimental groups to explore whether Common Cuckoos preferentially choose host Oriental Reed Warbler(Acrocephalus orientalis)nests that are early in their laying *** found that Common Cuckoos preferentially parasitize nests of the host Oriental Reed Warbler that are earlier in their laying(less *** eggs)or nesting cycle(eggs ***),and videos of our experiments provide direct insights into their decision making *** results provide strong experimental evidence that Common Cuckoos are able to assess nesting stage and strategically choose nests that increase the likelihood of successful parasitism.

关键词： Brood parasitism Common Cuckoo Clutch size Egg laying Oriental Reed Warbler

Adjuvant treatment for triple-negative breast cancer: a retrospective study of immunotherapy with autologous cytokine-induced killer cells in 294 patients

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Cancer Biology & Medicine 2019年第2期16卷 350-360页

作者： yuhan zhang Shuaibing Wang Beibei Yang Su Lu Yiyi Du Hong Liu The Second Department of Breast Cancer Tianjin Medical University Cancer Institute and Hospital/ National Clinical Research Center for Cancer/ Key Laboratory of Cancer Prevention and Therapy Tianjin/ Tianjin's Clinical Research Center for Cancer/ Key Laboratory of Breast Cancer Prevention and Therapy Tianjin Medical University Ministry of Education Tianjin 300060 China Oncology Department China National Petroleum Corporation Central Hospital Langfang 065000 China

Objective: To examine the efficacy and safety of a sequential combination of chemotherapy and autologous cytokine-induced killer(CIK) cell treatment in triple-negative breast cancer(TNBC) ***: A total of 294 post-surgery TNBC patients participated in the research from January 1, 2009 to January 1, 2015. After adjuvant chemotherapy, autologous CIK cells were introduced in 147 cases(CIK group), while adjuvant chemotherapy alone was used to treat the remaining 147 cases(control group). The major endpoints of the investigation were the disease-free survival(DFS) and overall survival(OS). Additionally, the side effects of the treatment were ***: In the CIK group, the DFS and OS intervals of the patients were significantly longer than those of the control group(DFS:P = 0.047;OS: P = 0.007). The multivariate analysis demonstrated that the TNM(tumor-node-metastasis) stage and adjuvant CIK treatment were independent prognostic factors for both DFS [hazard ratio(HR)= 0.520, 95% confidence interval(CI):0.271-0.998, P = 0.049;HR = 1.449, 95% CI:1.118-1.877, P = 0.005, respectively] and OS(HR=0.414, 95% CI:0.190-0.903, P = 0.027;HR= 1.581, 95% CI:1.204-2.077, P = 0.001, respectively) in patients with TNBC. Additionally, longer DFS and OS intervals were associated with increased number of CIK treatment cycles(DFS: P = 0.020;OS: P = 0.040). The majority of the patients who benefitted from CIK cell therapy were relatively early-stage TNBC ***: Chemotherapy in combination with adjuvant CIK could be used to lower the relapse and metastasis rate, thus effectively extending the survival time of TNBC patients, especially those at early stages.

关键词： Immunotherapy triple-negative breast cancer cytokine-induced killer cell prognosis disease-free survival overall survival

Spatial variations in CO2 fluxes in a subtropical coastal reservoir of Southeast China were related to urbanization and land-use types

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Journal of Environmental Sciences 2021年第11期33卷 206-218页

作者： Yifei zhang Min Lyu Ping Yang Derrick Y.F.Lai Chuan Tong Guanghui Zhao Ling Li yuhan zhang Hong Yang Key Laboratory of Humid Subtropical Eco-geographical Process of Ministry of Education Fujian Normal UniversityFuzhou 350007China School of Geographical Sciences Fujian Normal UniversityFuzhou 350007China Key Laboratory of Wetland Ecology and Environment Northeast Institute of Geography and AgroecologyChinese Academy of SciencesChangchun 130102China School of Urban and Rural Construction Shaoyang UniversityShaoyang 422000China Department of Geography and Resource Management The Chinese University of Hong KongHong KongChina College of Environmental Science and Engineering Fujian Normal UniversityFuzhou 350007China Collaborative Innovation Center of Atmospheric Environment and Equipment Technology Jiangsu Key Laboratory of Atmospheric Environment Monitoring and Pollution Control(AEMPC)School of Environmental Science and EngineeringNanjing University of Information Science and TechnologyNanjing 210044China Department of Geography and Environmental Science University of ReadingReading RG66AB United Kingdom

Carbon dioxide(CO_(2))emissions from aquatic ecosystems are important components of the global carbon cycle,yet the CO_(2)emissions from coastal reservoirs,especially in developing countries where urbanization and rapid land use change occur,are still poorly *** this study,the spatiotemporal variations in CO_(2)concentrations and fluxes were investigated in Wenwusha Reservoir located in the southeast coast of ***,the mean CO_(2)concentration and flux across the whole reservoir were 41.85±2.03μmol/L and 2.87±0.29 mmol/m2/h,respectively,and the reservoir was a consistent net CO_(2)source over the entire *** land use types and urbanization levels in the reservoir catchment significantly affected the input of exogenous carbon *** mean CO_(2)fluxwasmuch higher from waters adjacent to the urban land(5.05±0.87 mmol/m2/hr)than other land use *** with larger input of exogenous substance via sewage discharge and upstream runoff were often the hotspots of CO_(2)emission in the *** results suggested that urbanization process,agricultural activities,and large input of exogenous carbon could result in large spatial heterogeneity of CO_(2)emissions and alter the CO_(2)biogeochemical cycling in coastal *** studies should characterize the diurnal variations,microbial mechanisms,and impact of meteorological conditions on reservoir CO_(2)emissions to expand our understanding of the carbon cycle in aquatic ecosystems.

关键词： Carbon dioxide fluxes Spatiotemporal dynamics Land use Urbanization Anthropogenic activities Coastal reservoir

Experiment on inducing apoptosis of melanoma cells by micro-plasma jet

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Nanotechnology and Precision Engineering 2024年第1期7卷 10-17页

作者： Hua Li Qihao Shi Yanhua Yang Jinghao Qi yuhan zhang Fengyun Wang Xiaoxia Du Wenxiang Xiao School of Life and Environmental Sciences GuiLin University of Electronic TechnologyGuilinGuangXi 541004People’s Republic of China The Guangxi Human Physiological Information Noninvasive Detection Engineering Technology Research Center GuilinGuangXi 541004People’s Republic of China Guilin URIT MEDICAL Electronic Sales Co. Ltd.GuilinGuangXi 541004People’s Republic of China

As a promising cancer treatment method,cold atmospheric plasma has received widespread attention in recent ***,previous research has focused more on how to realize and expand the anti-cancer scope of plasma *** are also studies on the killing of small-scale cancer cells,but the effects of plasma jet on normal cells and normal cell clusters have been ***,we proposed a 50μm sized micro-plasma jet device,and used the device to treat melanoma cells(A-375)and human glial cells(HA1800)to evaluate their anti-cancer effects and effects on normal *** experimental results show that this kind of micro-plasma jet device can effectively inactivate cancer cells in a short period of time,while having little effect on normal *** work provides a certain experimental basis for the application ofﬁne plasma jet to clinically inactivate cancer cells.

关键词： 3D cell clusters Micro-plasma jet Cancer therapy Reactive oxygen species Plasma direct treatment