检索结果-南通市图书馆

Differences in parameter estimates derived from various methods for the ORYZA(v3) Model

Journal of Integrative Agriculture 2022年第2期21卷 375-388页

作者： tan Jun-wei DUAN Qing-yun gong Wei DI Zhen-hua College of Water Resources and Civil Engineering China Agricultural UniversityBeijing 100083P.R.China College of Water Resources and Hydrology Hohai UniversityNanjing 210098P.R.China Institute of Land Surface System and Sustainable Development Faculty of Geographical ScienceBeijing Normal UniversityBeijing 100875P.R.China

Parameter estimation is always a difficult issue for crop model users, and inaccurate parameter values will result in deceptive model predictions. Parameter values may vary with different inversion methods due to equifinality and differences in the estimating processes. Therefore, it is of great importance to evaluate the factors which may influence parameter estimates and to make a comparison of the current widely-used methods. In this study, three popular frequentist methods(SCE-UA, GA and PEST) and two Bayesian-based methods(GLUE and MCMC-AM) were applied to estimate nine cultivar parameters using the ORYZA(v3) Model. The results showed that there were substantial differences between the parameter estimates derived by the different methods, and they had strong effects on model predictions. The parameter estimates given by the frequentist methods were obviously sensitive to initial values, and the extent of the sensitivity varied with algorithms and objective functions. Among the frequentist methods, the SCE-UA was recommended due to the balance between stable convergence and high efficiency. All the parameter estimates remarkably improved the goodness of model-fit, and the parameter estimates derived from the Bayesian-based methods had relatively worse performance compared to the frequentist methods. In particular, the parameter estimates with the highest probability density of posterior distributions derived from the MCMC-AM method(MCMC_P_(max)) led to results equivalent to those derived from the frequentist methods, and even better in some situations. Additionally, model accuracy was greatly influenced by the values of phenology parameters in validation.

关键词： parameter estimation frequentist method Bayesian method crop model calibration

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

An unusual case of gastric outlet obstruction caused by multiple giant persimmon phytobezoars

引用

Gastroenterology Report 2019年第1期7卷 74-76,I0002页

作者： Fengbo tan Hongbin Mo Xiao He Haiping pei Department of Gastrointestinal Surgery Xiangya Hospital of Central South UniversityChangshaHunanChina The Third Surgery Department Mayang Traditional Medical HospitalHuaihuaHunanChina Department of Breast Cancer HuNan Cancer HospitalChangshaHunanChina

A phytobezoar is a bezoar or trapped mass in the gastrointestinal system that consists of indigestible plant material such as fibers,skins and seeds.A persimmon phytobezoar(considered to be harder than other types of phytobezoars)is formed after frequent consumption of *** complication of gastrointestinal tract obstruction from bezoars was found to exist in the intestines but was rarely reported in the gastric tract because of its flexible *** we present a 57-yearold man with persimmon phytobezoars,which ultimately led to gastric outlet obstruction.

关键词： persimmon phytobezoar gastric outlet obstruction surgery

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Partitioning behavior and lattice misfit of γ/γ’phases in Ni-based superalloys with different Mo additions

引用

Rare Metals 2021年第4期40卷 920-927页

作者： Zhe Ma Yan-Ling pei Liang Luo Lu Qin Shu-Suo Li Sheng-Kai gong School of Materials Science and Engineering Beihang UniversityBeijing 100191China

A low-density single crystal(LDS) alloy with the composition of high Mo content was *** extra 1.5 wt% Mo was added in the Alloy A with the composition of Ni-6.5 Al-8.0 Mo-2.4 Cr-6.2 Ta-4.9 Co-1.5 Re-(0.01-0.05) Y(wt%) to study the influence of Mo on the lattice parameter and partitioning *** electron microscope(SEM) with energy-dispersive spectrometer(EDS),transmission electron microscopy(TEM)and high-temperature X-ray diffraction(HT-XRD) were used to observe the microstructure,analyze the elemental content and measure the lattice parameter of the *** natural lattice misfit was calculated by lattice constants which were measured by HT-XRD at the temperature from 25 to 1150℃,and the results showed that the lattice misfit would be more and more negative with temperature *** was found that 1.5 wt% addition of Mo will increase the absolute value of the lattice misfit of γ/γ’phases and the volume fraction of γ’,and at the same time,influence the elemental distribution in γ and γ’ phases,especially Re and *** has a higher partitioning ratio(k) after the addition of Mo.

关键词： Ni-based superalloys Mo Lattice misfit High-temperature X-ray diffraction(HT-XRD) Partitioning behavior

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Effect of trace Ce on high-temperature oxidation behavior of an Al-Sicoated Ni-based single crystal superalloy

引用

Journal of Iron and Steel Research International 2019年第1期26卷 78-83页

作者： Xiao-juan Pang Shu-suo Li Lu Qin Yan-ling pei Sheng-kai gong School of Materials Science and Engineering Beihang UniversityBeijing 100191China

Ni-based single crystal superalloy IC21 with different Ce con tents was prepared by screw selection method,and Al-Si coatings were prepared by pack *** oxidation and transient oxidation were carried out at 1150℃ to investigate the effect of Ce on the high-temperature oxidation behavior of Al-Si *** cyclic oxidation at 1150℃,the addition of trace Ce decreased the mass gain of the Al-Si-coated samples and effectively improved oxidation perform a nee and spallation *** specimens without Ce doping,microstructure examinatio n revealed that bulkyγ-Ni3Al precipitated in oxidized coating because of high Al con sumption,and this finding suggests that Ce inhibits the consumption of Al in the coating during *** slows down the Ininsformation of O-Al2O3 to oc-Al2O3 and improves the adhesion of the oxide scale.

关键词： Single crystal superalloy Trace Ce Al-Si coating Oxidation behavior AlO3

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Dispersion of Titanium（Ⅳ） Oxide Nanoparticles in Mixed Matrix Membrane Using Octaisobutyl Polyhedral Oligomeric Silsesquioxane for Enhanced CO2/CH4 Separation Performance

引用

Chinese Journal of Polymer Science 2019年第7期37卷 654-663页

作者： Grace Ying En tan pei Ching Oh Kok Keong Lau Siew Chun Low CO2 Research Centre (CO2RES) Institute of Contaminant ManagementChemical Engineering DepartmentUniversiti Teknologi PETRONAS32610 Seri IskandarPerakMalaysia School of Chemical Engineering Engineering CampusUniversiti Sains Malaysia14300 Nibong TebalPenangMalaysia

Titanium(IV) oxide (TiO2) nanoparticles have been incorporated into mixed matrix membranes (MMMs) to improve gas separation performance. However, TiO2 nanoparticles tend to agglomerate due to high surface energy and van der Waals forces. This leads to precipitation which causes the formation of non-homogeneous MMM morphology. In this study, the effect of octaisobutyl polyhedral oligomeric silsesquioxane (POSS) addition on TiO2/polysulfone MMM was investigated. The aims are to enhance gas separation performance whilst preventing agglomeration of TiO2 nanoparticles. The results demonstrated that inclusion of POSS as dispersant increases MMMs’ CO2/CH4 selectivity and permeance, possibly due to less void formation and more evenly distributed pore structure. For example, synergistic addition of 5 wt% TiO2 and 5 wt% POSS increased the CO2/CH4 selectivity up to 390% compared to MMM without POSS. This is supported by elemental mapping of titanium which revealed that POSS successfully dispersed TiO2 nanoparticles and prevented aggregation. TiO2-POSS/PSf MMMs also retained their favorable thermal stability.

关键词： Applications Membranes Nanoparticles Separation techniques Thermogravimetric analysis (TGA)

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Review of electrostatic system parameters,charged droplets characteristics and substrate impact behavior from pesticides spraying

引用

International Journal of Agricultural and Biological Engineering 2019年第2期12卷 1-9页

作者： Samuel Appah pei Wang Mingxiong Ou Chen gong Weidong Jia Key Laboratory of Modern Agricultural Equipment and Technology Ministry of EducationJiangsu UniversityZhenjiang 212013JiangsuChina Key Laboratory of Plant Protection Engineering Ministry of Agriculture and Rural AffairsJiangsu UniversityZhenjiang 212013JiangsuChina

Electrostatic spraying application is adopted in crop protection to prevent pest infestation,to improve product quality and to maximize *** involves a superposition of charges to pesticide spray droplets to attract substrate ions at obscured *** droplets wraparound effect reduces off-target deposition,enhances on-target spray and invariably improves spray *** spraying system works effectively at optimum parameters in combination with charging voltages,application pressures,spraying height regimes,flow rate,travel speed,electrode material,and nozzle *** combinations of the system parameter settings have been systematically used by researchers for the electrostatic application,but there are unknown specific optimum parameters combinations for pesticide *** droplets chargeability influences the effectiveness of electrostatic spraying system,the parameters that produce ideal charge to mass ratio determine the functionality of the spraying deposition,retention and surface *** article,therefore,analyses electrostatic system parameters that produce suitably charged droplets characteristics for effective impacting behavior of pesticides on *** applied voltages consequently maximizes charge-mass ratio to optimum and starts declining upon further increase in voltages beyond a critical *** review further proposes the selection of an optimum electrostatic parameters combination that yields optimum droplets chargeability in pesticide ***,it is necessary to investigate the charge property of substrates prior to pesticide application in order to superpose the right opposite charge on spray droplets at rupture time during electrostatic spraying system.

关键词： electrostatic spraying charged droplets substrates deposition wraparound charge-mass ratio

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Systematic review of Yougui pills combined with levothyroxine sodium in the treatment of hypothyroidism

引用

World Journal of Clinical Cases 2022年第17期10卷 5690-5701页

作者： Xiao-pei Liu Ya-Nan Zhou Cong-E tan School of Basic Medicine Shaanxi University of Chinese MedicineXianyang 712046Shaanxi ProvinceChina

BACKGROUND Yougui pills have long been used to treat hypothyroidism,usually in combination with levothyroxine sodium in clinical treatment,while their clinical efficacy and safety are still controversial when compared to levothyroxine treatment *** To explore the clinical efficacy and safety of Yougui pills combined with levothyroxine sodium in the treatment of *** This meta-analysis was performed in accordance with the PRISMA *** controlled trials on Yougui pills in the treatment of hypothyroidism published from 2008 to May 2021 were searched in a total of 8 databases(4 databases in Chinese and 4 databases in English).The quality of the included studies was evaluated according to the Cochrane risk assessment *** mean difference(WMD)was used for continuous variables,and relative risk(RR)was used for binary *** were extracted,and the meta-analysis was conducted with the statistical software of Stata15.0 and *** A total of 140 articles were retrieved,and 9 of them were finally included,with a total sample size of 936 *** main meta-analysis results are as follows:(1)The group of Yougui pills combined with levothyroxine sodium had a significantly higher overall response rate than the group of levothyroxine sodium(RR=1.20,95%CI 1.12,1.28,Ptandard mean difference(SMD)=-1.10,95%CI:-1.37,-0.84,P<0.00001];(3)The level of thyrotropin stimulating hormone in the group of Yougui pills combined with levothyroxine sodium was significantly lower than in the control group of levothyroxine sodium(WMD=-1.38,95%CI:-2.10,-0.67,P=0.00001);(4)The level of free triiodothyronine in the group of Yougui pills combined with levothyroxine sodium was higher than that in the control group of levothyroxine sodium(WMD=0.41,95%CI:0.03,0.79,P=0.03);(5)The

关键词： Yougui pills Levothyroxine sodium Hypothyroidism Systematic review

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

A decision hyper plane heuristic based artificial immune network classification algorithm

引用

Journal of Central South University 2013年第7期20卷 1852-1860页

作者： DENG Ze-lin tan Guan-zheng HE pei YE Ji-xiang School of Information Science and Engineering Central South University Changsha 410083 China School of Computer and Communication Engineering Changsha University of Science and Technology Changsha 410076 China

Most of the developed immune based classifiers generate antibodies randomly, which has negative effect on the classification performance. In order to guide the antibody generation effectively, a decision hyper plane heuristic based artificial immune network classification algorithm （DHPA1NC） is proposed. DHPAINC taboos the inner regions of the class domain, thus, the antibody generation is limited near the class domain boundary. Then, the antibodies are evaluated by their recognition abilities, and the antibodies of low recognition abilities are removed to avoid over-fitting. Finally, the high quality antibodies tend to be stable in the immune network. The algorithm was applied to two simulated datasets classification, and the results show that the decision hyper planes determined by the antibodies fit the class domain boundaries well. Moreover, the algorithm was applied to UCI datasets classification and emotional speech recognition, and the results show that the algorithm has good performance, which means that DHPAINC is a promising classifier.

关键词： artificial immune network decision hyper plane recognition ability classification

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

GABA_A Receptor Activity Suppresses the Transition from Interictal to Ictal Epileptiform Discharges in Juvenile Mouse Hippocampus

引用

Neuroscience Bulletin 2018年第6期34卷 1007-1016页

作者： Yan-Yan Chang Xin-Wei gong Hai-Qing gong pei-Ji Liang Pu-Ming Zhang Qin-Chi Lu Department of Neurology Ren Ji Hospital School of Medicine Shanghai Jiao Tong University School of Biomedical Engineering Shanghai Jiao Tong University

Exploring the transition from inter-ictal to ictal epileptiform discharges(IDs) and how GABAAreceptormediated action affects the onset of IDs will enrich our understanding of epileptogenesis and epilepsy *** used Mg2+-free artificial cerebrospinal fluid(ACSF) to induce epileptiform discharges in juvenile mouse hippocampal slices and used a micro-electrode array to record the discharges. After the slices were exposed to Mg2+-free ACSF for 10 min–20 min, synchronous recurrent seizurelike events were recorded across the slices, and each event evolved from inter-ictal epileptiform discharges(IIDs) to pre-ictal epileptiform discharges(PIDs), and then to *** the transition from IIDs to PIDs, the duration of discharges increased and the inter-discharge interval decreased. After adding 3 lmol/L of the GABAAreceptor agonist muscimol, PIDs and IDs disappeared, and IIDs remained. Further, the application of 10 lmol/L muscimol abolished all the epileptiform discharges. When the GABAAreceptor antagonist bicuculline was applied at 10 lmol/L, IIDs and PIDs disappeared, and IDs remained at decreased intervals. These results indicated that there are dynamic changes in the hippocampal network preceding the onset of IDs, and GABAAreceptor activity suppresses the transition from IIDs to IDs in juvenile mouse hippocampus.

关键词： Epileptiform discharge Gamma-aminobutyric acid Bicuculline Muscimol Micro-electrode array Hippocampal slice

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

[Advances in molecular networking technology for discovering emerging contaminants and transformation products]

引用

Se pu = Chinese journal of chromatography 2025年第1期43卷 33-42页

作者： Xiao-Mei tan Yu-Wei Zhang Zhao-Yu Jiao Nan-Yang Yu Si Wei State Key Laboratory of Pollution Control & Resource Reuse School of Environment Nanjing University Nanjing 210046 China.

Emerging contaminants and their transformation products are widely distributed in the environment. These pollutants carry unknown risks owing to their persistence, migration, and toxicity. The wide variety and complex structures of these substances render them difficult to identify using only target analysis. Suspect screening analysis can identify more substances than target analysis in a single run. However, this analysis method is based on limited data and cannot meet the growing demand for compound identification, especially for emerging contaminants and their transformation products with unknown information. The development of high-resolution mass spectrometry technology has promoted the applications of nontarget analysis in the environmental field, especially for identifying unknown transformation products. At present, the challenges of nontarget analysis include the difficulty of finding compounds of interest and their transformation products from complex data. Molecular networking calculates the similarity between mass spectra based on an improved cosine similarity algorithm. This method can cluster molecular families with similar structures, achieve visualization and a collection of massive mass spectral datasets, and promote the annotation of pollutants through networks and communities. Molecular networking can globally organize and systematically interpret complex tandem mass spectral datasets, providing a new direction for nontarget analysis. This technology was first used in proteomics and gradually introduced into metabolomics for the discovery of new natural products. Recently, it has been introduced into the environmental field for the study of various man-made chemicals, particularly for the discovery of emerging contaminants and their transformation products. In this paper, we introduce a molecular networking analysis method based on high-resolution tandem mass spectrometry and describe its applications in the nontargeted screening of emerging cont

关键词： emerging contaminants high-resolution tandem mass spectrometry molecular networking transformation products

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：