检索结果-南通市图书馆

Enhanced and irreversible sorption of pesticide pyrimethanil by soil amended with biochars

在线全文

学校读者我要写书评

暂无评论

Journal of Environmental Sciences 2010年第4期22卷 615-620页

作者： xiangyang yu Ligang Pan Guangguo Ying Rai S. Kookana Pesticide Biological 6 Ecological Research Center Jiangsu Academy of Agricultural Sciences Nanjing 210014 China. CSIRO Land and Water PMB No 2 Glen Osmond 50641 South Australia Guangzhou Institute of Geochemistry Chinese Academy of Sciences Guangzhou 510640 China Beijing Research Center for Agrifood Testing and Farmland Monitoring Beijing 100097 China

Biochar derived from partial combustion of vegetation is ubiquitous and potentially effective in sequestration of environmental contaminants. Biochars were prepared by burning of red gum （Eucalyptus spp.） woodchips at 450 and 850℃ （labeled as BC450 and BC850）. These two biochars were found to possess markedly different properties in terms of surface area and porosity. Short-term equilibration tests （24 hr） were conducted to assess the sorption-desorption behavior of pyrimethanil in the soil amended with various amounts of biochar of each type, with a special focus on the desorption behavior of the sorbed pesticide through four times successive desorption by dilution. Sorption coefficient and isotherm nonlinearity of the amended soils progressively increased with the content of biochar in the soil. Biochar BC850 with higher surface area and microporosity showed a stronger effect on the reversibility of sorption pesticide. The soils amended with 5% BC450 and 1% BC850 had nearly the same sorption capacity for pyrimethanil; however, their desorption processes were very different with 13.65% and 1.49% of the sorbed pesticide being released, respectively. This study suggested that biochar in soil could be an important factor for immobilization of a pesticide and thus affecting its environment fate in soil.

关键词： biochar pyrimethanil sorption desorption

Enhanced Sensitivity and Selectivity of Chemosensor for Malonate by Anchoring on Gold Nanoparticles

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Chemistry 2011年第3期29卷 531-538页

作者： Liu, Yanyun Liu, yun Liang, Zhongshi Li, xiangyang Liu, Shunying yu, Jiahui Institute for Advanced Interdisciplinary Research East China Normal University Shanghai 200062 China

A novel organic-inorganic nanohybrided receptor 4 functionalized with bis-thiourea arms and then assembled on gold nanoparticles was synthesized. The preorganized system possesses phenylthiourea units for the spectropho- tometric sensing of dicarboxylates, especially malonate, based on changes in the surface plasmon absorption of the gold nanoparticles （GNPs）. The intensity of the absorbance band increases gradually with the concentration of di- carboxylates increasing. But such an ion-selective change in the plasmon band was not observed in control tests carried out by mono-thiourea-modified GNPs, receptor 3 and the free receptor 2. As it is shown from the association constants, derived from quantitative titrations, receptor 4 can selectively recognize dicarboxylate anions of shorter carbon chain, and has the highest affinity to malonate. The interaction properties for anions of receptor 4 were evaluated by lH NMR and UV-vis spectroscopic methods.

关键词： thiourea gold nanoparticle assembly manolate sensor

Memory effect in time fractional Schrödinger equation

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Physics B 2024年第2期33卷 216-221页

作者：祖传金余向阳 School of Physics State Key Laboratory of Optoelectronic Materials and TechnologiesSun Yat-Sen UniversityGuangzhou 510275China

A significant obstacle impeding the advancement of the time fractional Schrodinger equation lies in the challenge of determining its precise mathematical *** order to address this,we undertake an exploration of the time fractional Schrodinger equation within the context of a non-Markovian *** leveraging a two-level atom as an illustrative case,we find that the choice to raise i to the order of the time derivative is *** contrast to the conventional approach used to depict the dynamic evolution of quantum states in a non-Markovian environment,the time fractional Schrodinger equation,when devoid of fractional-order operations on the imaginary unit i,emerges as a more intuitively comprehensible framework in physics and offers greater simplicity in computational ***,we also prove that it is meaningless to study the memory of time fractional Schrodinger equation with time derivative 1<α≤*** should be noted that we have not yet constructed an open system that can be fully described by the time fractional Schrodinger *** will be the focus of future *** study might provide a new perspective on the role of time fractional Schrodinger equation.

关键词： time fractional Schrodinger equation memory effect non-Markovian environment

Developing an atmospheric aging evaluation model of acrylic coatings:A semi-supervised machine learning algorithm

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

International Journal of Minerals,Metallurgy and Materials 2024年第7期31卷 1617-1627页

作者： Yiran Li Zhongheng Fu xiangyang yu Zhihui Jin Haiyan Gong Lingwei Ma Xiaogang Li Dawei Zhang Beijing Advanced Innovation Center for Materials Genome Engineering Institute for Advanced Materials and TechnologyUniversity of Science and Technology BeijingBeijing 100083China National Materials Corrosion and Protection Data Center University of Science and Technology BeijingBeijing 100083China BRI Southeast Asia Network for Corrosion and Protection(MOE) Shunde Innovation School of University of Science and Technology BeijingFoshan 528399China

To study the atmospheric aging of acrylic coatings,a two-year aging exposure experiment was conducted in 13 representative climatic environments in *** atmospheric aging evaluation model of acrylic coatings was developed based on aging data including11 environmental factors from 567 cities.A hybrid method of random forest and Spearman correlation analysis was used to reduce the redundancy and multicollinearity of the data set by dimensionality reduction.A semi-supervised collaborative trained regression model was developed with the environmental factors as input and the low-frequency impedance modulus values of the electrochemical impedance spectra of acrylic coatings in 3.5wt%NaCl solution as *** model improves accuracy compared to supervised learning algorithms model(support vector machines model).The model provides a new method for the rapid evaluation of the aging performance of acrylic coatings,and may also serve as a reference to evaluate the aging performance of other organic coatings.

关键词： acrylic coatings coatings aging atmospheric environment machine learning

First-generation EGFR tyrosine kinase inhibitor therapy in 106 patients with compound EGFR-mutated lung cancer: a single institution’s clinical practice experience

在线全文

学校读者我要写书评

暂无评论

Cancer Communications 2018年第1期38卷 556-568页

作者： xiangyang yu Xuewen Zhang Zichen Zhang Yongbin Lin Yingsheng Wen Yongqiang Chen Weidong Wang Lanjun Zhang State Key Laboratory of Oncology in South China Collaborative Innovation Center for Cancer MedicineGuangzhou 510060GuangdongChina Department of Thoracic Surgery Sun Yat-sen University Cancer Center651 Dongfeng Road EastGuangzhou 510060GuangdongChina Department of Medical Oncology Sun Yat-sen University Cancer CenterGuangzhou 510060Guang-dongChina Department of Molecular Pathology Sun Yat-sen University Cancer CenterGuangzhou 510060GuangdongChina

Background:The antitumour efficacy of tyrosine kinase inhibitors(TKIs)in lung cancer patients with compound epidermal growth factor receptor(EGFR)mutations has not been *** study summarizes a single institutional experience of first-generation TKI therapy for lung cancers with compound EGFR ***:A total of 106 consecutive patients with tumours bearing compound EGFR mutations were identified between January 2012 and May 2016;all patients received first-generation TKI *** in exon 19 and the L858R point mutation in exon 21 were considered common mutations;T790M was considered separately because of its association with TKIs *** other mutation was defined as a rare *** were divided as follows:double common mutations(group A);common plus T790M mutations(group B);common plus rare muta-tions(group C);double rare mutations(group D);and rare plus T790M mutations(group E).A separate group of 115 consecutive patients with a single common mutation was created for comparative analysis(group F).Results:The frequency of patients with compound EGFR was 2.9%(114/3925)and their response rate to first-genera-tion TKIs was 50.9%,which was not significantly different from group F(67.0%,P=0.088).The progression-free survival(PFS)of the 106 patients receiving TKI therapy was worse than that of group F(median,9.1 vs.13.0 months,respec-tively;P<0.001).The PFS of the compound mutation group was shorter than that of the single common mutation group(median,10.1 months in group A,P=0.240;9.1 months in group B,P<0.001;9.6 months in group C,P=0.010;6.5 months in group D,P=0.048;5.4 months in group E,P=0.017).Patients with a co-occurring mutation in exon 20(excluding T790M)exhibited significantly worse PFS than the patients with other compound mutations or with a single common mutation(median,6.5 vs.9.1 vs.13.0 months,respectively,P=0.002).Conclusions:There was significant heterogeneity among the compound EGFR mutations and their respons

关键词： EGFR TKIs Compound mutations

Macrophage-derived SHP-2 inhibits the metastasis of colorectal cancer via Tie2-PI3K signals

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Oncology Research 2023年第2期31卷 125-139页

作者： XUELIANG WU SHAOyu GUAN YONGGANG LU JUN XUE xiangyang yu QI ZHANG XIMO WANG TIAN LI Department of Gastrointestinal Surgery Tianjin Medical University Nankai HospitalTianjin300100China 93868 Troop of the Chinese People’s Liberation Army Yinchuan750021China Clinical Laboratory Hebei General HospitalShijiazhuang050051China Department of General Surgery The First Affiliated Hospital of Hebei North UniversityZhangjiakou075000China Tianjin Key Laboratory of Acute Abdomen Disease Associated Organ Injury and ITCWM Repair Institute of Integrative Medicine for Acute Abdominal DiseasesIntegrated Chinese and Western Medicine HospitalTianjin UniversityTianjin300100China School of Basic Medicine Fourth Military Medical UniversityXi’an710032China

This research aimed to explore the influence of Src homology-2 containing protein tyrosine phosphatase(SHP-2)on the functions of tyrosine kinase receptors with immunoglobulin and EGF homology domains 2(Tie2)-expressing monocyte/macrophages(TEMs)and the influence of the angiopoietin(Ang)/Tie2-phosphatidylinositol-3-kinase(PI3K)/protein kinase B(Akt)/mammalian target of rapamycin(mTOR)(Ang/Tie2-PI3K/Akt/mTOR)signaling pathway on the tumor microvascular remodeling in an immunosuppressive *** vivo,SHP-2-deficient mice were used to construct colorectal cancer(CRC)liver metastasis ***-2-deficient mice had significantly more metastatic cancer and inhibited nodules on the liver surface than wild-type mice,and the high-level expression of p-Tie2 was found in the liver tissue of the macrophages’specific SHP-2-deficient mice(SHP-2MACKO)+planted tumor *** with the SHP-2 wild type mice(SHP-2WT)+planted tumor group,the SHP-2MAC-KO+planted tumor group experienced increased expression of p-Tie2,p-PI3K,p-Akt,p-mTOR,vascular endothelial growth factor(VEGF),cyclooxygenase-2(COX-2),matrix metalloproteinase 2(MMP2),and MMP9 in the liver *** selected by in vitro experiments were co-cultured with remodeling endothelial cells and tumor cells as *** was found that when Angpt1/2 was used for stimulation,the SHP-2MAC-KO+Angpt1/2 group displayed evident increases in the expression of the Ang/Tie2-PI3K/Akt/mTOR *** number of cells passing through the lower chamber and the basement membrane and the number of blood vessels formed by cells compared with the SHP-2WT+Angpt1/2 group,while these indexes were subjected to no changes under the simultaneous stimulation of Angpt1/2+*** sum up,the conditional knockout of SHP-2 can activate the Ang/Tie2-PI3K/Akt/mTOR pathway in TEMs,thereby strengthening tumor micro angiogenesis in the microenvironment and facilitating CRC liver metastasis.

关键词： SHP-2 Tie2 PI3K Akt/mTOR signaling Colorectal cancer Liver metastasis Macrophages

Applications of Business Process Management （BPM） in Chinese Firms： A Managerial Accounting Perspective

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Modern Accounting and Auditing 2014年第3期10卷 333-343页

作者： Sang xiangyang yu Zengbiao Tsinghua University Beijing China

Based on a questionnaire survey, the aim of this paper is to explore the relationship of business process management （BPM） with managerial accounting system （MAS） and their economic performance consequences in Chinese firms. Statistical data show that more firms accept business process improvement （BPI） other than business process reengineering （BPR） and optimize their activity chains other than supply chains. Through the construction of three elements, i.e., goal-setting, monitoring, and incentive schemes, of MAS, the study finds that when implementing BPM, firms usually use accounting indexes to set goals of the effect of business processes and combine the goals with monitoring and incentive schemes. Statistical data also show that incentive schemes get the lowest usage degree compared with goal-setting and monitoring. In addition, there are differences in their managerial accounting usages for BPM among firms considering ownership, industry, and scale. The main finding of this paper is that BPM empirically brings favorable changes to firms＇ economic performance via managerial accounting in general, and via goal-setting, monitoring, and incentive schemes in particular.

关键词： business process management (BPM) goal-setting monitoring incentive schemes

Value Creation of Business Process Management （BPM） and Managerial Accounting System （MAS）： A Case Study

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Modern Accounting and Auditing 2014年第7期10卷 786-792页

作者： Sang xiangyang yu Zengbiao Tsinghua University Beijing China

This paper explores the value creation of business process management （BPM） and managerial accounting system （MAS） using a case study. The findings show that BPM shortens the management chain and increases the connections among functions in the organization by right reassignment. Accounting indicators in MAS provide necessary information about business processes, which assists performance evaluation in BPM, and meanwhile, incentive schemes give enough motives, which guide employees to take actions in accordance with the organizational strategies and processes＇ goals. The information effect and motive effect of MAS increase employees＇ work satisfaction and their cooperation with each other. In the end, the integration of BPM and MAS improves the organizational economic performance, thus creating value for the organization. The results explain the reason why so much BPM fails in practice, because right assignment, performance evaluation system, and incentive schemes constitute organizational architecture, which is critical to organizational value. Additionally, the value creation of BPM and MAS depends on their coordination with the external environment, the internal situation, and the organizational strategy. From the view of managerial accounting perspective, MAS not only changes with the organization development but also facilitates the organization development.

关键词： business process management (BPM) managerial accounting system (MAS) value creation

稠密共振介质中近偶极-偶极相互作用的局域场效应

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

强激光与粒子束 2011年第4期23卷 1068-1072页

作者：李成余向阳中山大学光电材料与技术国家重点实验室广州510275

为研究存在由近偶极-偶极相互作用诱导的局域场效应时超短强激光脉冲与稠密共振介质相互作用的特性,采用光与物质相互作用的半经典理论,建立了稠密二能级体系中考虑原子间近偶极-偶极相互作用的修正光学Bloch方程,并用四阶Runge-Kutta... 详细信息

为研究存在由近偶极-偶极相互作用诱导的局域场效应时超短强激光脉冲与稠密共振介质相互作用的特性,采用光与物质相互作用的半经典理论,建立了稠密二能级体系中考虑原子间近偶极-偶极相互作用的修正光学Bloch方程,并用四阶Runge-Kutta法数值求解了该方程。研究结果表明:局域场效应对稠密二能级体系中Bloch矢量的瞬态相干过程和稳态性质都具有强烈的调制作用。并由此提出了调控稳态粒子数布居的两种方案。

关键词：激光物理光学Bloch方程稠密共振体系近偶极-偶极相互作用局域场效应