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Regularity and Radial Symmetry of Positive Solutions for a Higher Order Elliptic System

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Acta Mathematicae Applicatae Sinica 2017年第2期33卷 551-560页

作者： Huai-yu ZHOU Su-fang tang School of Statistics Xi'an University of Finance and Economics Xi'an 710100 China

We discuss the properties of solutions for the following elliptic partial differential equations system in Rn,where 0 〈α〈 n, pi and qi （i = 1, 2） satisfy some suitable assumptions. Due to equivalence between the PDEs system and a given integral system, we prove the radial symmetry and regularity of positive solutions to the PDEs system via the method of moving plane in integral forms and Regularity Lifting Lemma. For the special case, when p1 ＋ p2= q1 ＋ q2 = n＋α/n-α, we classify the solutions of the PDEs system.

关键词： higher order elliptic system radial symmetry regularity the method of moving plane classification of solution

Liouville Type Theorems for a System of Integral Equations on Upper Half Space

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Acta Mathematica Sinica,English Series 2014年第2期30卷 261-276页

作者： Su fang tang Jing Bo DOU School of Statistics Xi’an University of Finance and Economics

In this paper,we consider the following system of integral equations on upper half space {u（x） = ∫Rn ＋（1/｜x-y｜n-α-1/｜-y｜n-α） λ1up1（y）＋ μ1vp2（y）＋ β1up3（y）vp4（y） dy;v（x） = ∫Rn ＋（1/｜x-y｜n-α-1/｜-y｜n-α）（λ2uq1（y）＋ μ2vq2（y）＋ β2uq3（y）vq4（y） dy,where Rn ＋ = {x =（x1,x2,...,xn） ∈ Rn｜xn〉 0}, =（x1,x2,...,xn-1,-xn） is the reflection of the point x about the hyperplane xn= 0,0 〈 α 〈 n,λi,μi,βi≥ 0（i = 1,2） are constants,pi≥ 0 and qi≥ 0（i = 1,2,3,4）.We prove the nonexistence of positive solutions to the above system with critical and subcritical exponents via moving sphere method.

关键词： System of integral equations Liouville type theorem moving spheres method regularity

Phase transition of bastnaesite concentrate in calcification process

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Rare Metals 2016年第8期35卷 649-654页

作者： Yu-Kun Huang Ting-An Zhang Zhi-He Dou Jiang Liu fang-fang tang Key Laboratory of Ecological Metallurgy of Multi-Metal Intergrown Ores of Ministry of Education School of Materials and Metallurgy Northeastern University

The phase transformation in calcification process was investigated by X-ray diffraction （XRD） and differential scanning calorimeter （DSC）, and the effect of calcification on the leaching rate of rare earth was analyzed. The results show that bastnaesite transforms into rare earth hydrate at the cal- cification temperature range of 225-300 ℃. However, this transition is verified to be an efficient reaction for the acti- vating bastnaesite when the temperature is higher than 200 ℃. The leaching rate of rare earth increases to 89.17 % for activating bastnaesite from 36.27 % for the bastnaesite, and it is the highest with calcification temperature of 250 ℃, which is consistent with the result of DSC analysis. The transition of rare earth oxyfluoride into RE（OH）3 is acceler- ated by the addition of NaOH according to the experiments of different calcification systems.

关键词： Bastnaesite Calcification transformation Solidfluoride reaction Mineral phase transition

Prediction and determination of mildew grade in grain storage based on FOA-SVM algorithm

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Food Quality and Safety 2023年第1期7卷 145-151页

作者： Jianghao Yuan fang tang Zhihui Qi Huiyi Zhao Academy of National Food and Strategic Reserves Administration BeijingChina Hebei Agricultural University BaodingChina National Engineering Research Center of Grain Storage and Logistics BiingChina

Grain mildew is a significant hazard that causes food loss and poses a serious threat to human health when ***,effective prediction and determination of mildew grade is essential for the prevention and control of mildew and global food *** the present study,a model for predicting and determining the mildew grade of rice was constructed using logistic regression,back propagation neural network and GS-SVM(a grid search-based support vector machine algorithm)based on laboratory culture data and actual data from a granary,*** results show that the GS-SVM model has a better prediction effect,but the model cannot automatically adjust the parameters and is more subjective,and the accuracy may decrease when the data set ***,this paper establishes a new model for a support vector machine based on a fruit fly optimization algorithm(FOA-SVM),which can achieve automatic parameter search and automatically adjust its parameters to find the best result when the data set changes,with a strong ability of self-adjustment of *** addition,the FOA-SVM converges quickly and the model is *** results of this study provide a technical method for early identification of mildew grade during grain storage,which is beneficial for the prevention and control of rice mildew during grain storage.

关键词： Identification of grain mildew support vector machine fruit fly optimization algorithm grain security

Improvement of Creep and High Temperature Tensile Properties by Adding W to Orthorhombic Ti2AlNb-Based Alloys

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材料科学与工程学报 2000年第z1期20卷 1-6页

作者： fang tang National Research Institute for Metals 1-2-1 Sengen Tsukuba Ibaraki 305-0047 Japan

The Orthorhombic Ti2AlNb-based alloys (O alloys) are potential high temperature materials for applications in aircraft engines for their high specific strength. In this paper, with the purpose of enhancing the mechanical properties, W is added to O alloys as the quarternary alloying element. The effects of W additive on the high temperature tensile properties and creep resistance are investigated. The effects of boron doping on these properties are also studied.

关键词： titanium aluminide tensile properties creep

Adenovirus-associated hemophagocytic syndrome in a young child

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World Journal of Pediatrics 2020年第2期16卷 215-216页

作者： Fei-Zhou Zhang Yu-Qing Cai Lan-fang tang Department of Pulmonology Children's HospitalZhejiang University School of Medicine3333 Binsheng RoadHangzhou 310051China

A 2-year-old boy was admitted to our hospital because of recurrent fever,cough and wheezing for half a *** examination revealed obvious inspiratory three-concave sign,moist rales,wheezing,rash on the face and hepatosplenomegaly.A chest computer tomography revealed bilateral lung consolidation(Fig.1).Direct immunofluorescence of nasopharyngeal swab was positive for *** data showed reduced white blood cell of 3.63×10^9 cells/L(ref:4-10×10^9),hemoglobin of 98 g/L(ref:110-155 g/L)and platelets of 64×10^9/L(ref:100-400×10^9).Serum ferritin continued to be above 1500μg/L.

关键词： admitted lung nasopharyngeal

Termite-killing components in Serratia marcescens(SM1)

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Journal of Forestry Research 2021年第4期32卷 1739-1744页

作者： Renjie Fu Jian Luo Kai Feng Xiaoyu Lu fang tang Co-Innovation Center for the Sustainable Forestry in Southern China Nanjing Forestry UniversityNanjing 210037People’s Republic of China College of Forestry Nanjing Forestry UniversityNanjing 210037People’s Republic of China

The bacteria,Serratia marcescens(SMI) was previously obtained from the black-winged termite,Odontotermes for mo sanus *** was highly toxic to ***,however,the mechanism of toxicity is *** this study,toxicity test results showed that the main components that affected *** were in a supernatant and that the insecticidal protease in the supernatant resulted in the death of *** addition,zinc sulphate recovery experiments indicated that the metalloproteinases in the supernatant were more *** results provide a theoretical foundation for the future biological control of termites,the basis for the development of pest control technology and the discovery of new pesticides.

关键词： Odontotermes formosanus Shiraki Serratia marcescens strain SM1 Supernatant Protease Metalloproteinases

Pharmacogenomics-based individualized treatment of hypertension in preterm infants: A case report and review of the literature

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World Journal of Clinical Cases 2023年第30期11卷 7440-7449页

作者： Lian-fang tang Ao Xu Kai Liu Department of Pediatrics The First People’s Hospital of Yunnan ProvinceKunming 650000Yunnan ProvinceChina Pulmonary and Critical Care Medicine Kunming Children’s HospitalKunming 650000Yunnan ProvinceChina

BACKGROUND Neonatal hypertension is a rare but potentially serious condition that requires careful monitoring and *** can help guide individualized drug therapy and improve *** SUMMARY We report a case of a preterm infant with multiple complications,including bronchopulmonary dysplasia(BPD),sepsis,intracranial hemorrhage,and *** infant was treated with various drugs,including dexamethasone and *** infant was diagnosed with neonatal hypertension based on blood pressure measurements exceeding the 95th percentile for his age and *** possible causes of hypertension included dexamethasone,hydrochlorothiazide,spironolactone,and *** infant was treated with oral amlodipine to lower his blood pressure.A pharmacogenomic test was performed to evaluate the genetic polymorphisms of ABCB1 and CYP3A5,which are involved in the metabolism and transport of dexamethasone and *** infant’s blood pressure was well controlled after the dose of amlodipine was reduced according to the pharmacogenomic *** infant had a stable general condition and was discharged on the 100th d after *** This case illustrates the importance of regular blood pressure monitoring and etiological investigation in preterm infants with *** can provide useful information for individualized drug therapy and safety in this population.

关键词： Pharmacogenomics Hypertension Preterm Infants Case report

Synthesis of Syndiotactic Polystyrene with Novel Titanocene Catalysts Activated by Modified Methylaluminoxane

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Chinese Chemical Letters 1999年第2期10卷 171-174页

作者： fang Ming ZHU Qun fang WANG Yu tang fang Shang An LIN(Institute of Polymer Science, Zhongshan University. Guangzhou 510275) Zhongshan Univ Inst Polymer Sci Canton 510275 Peoples R China

Novel highly active eta(5)-pentamethylcyclopentadienyltribenzyloxy titanium catalyst activated by modified methylaluminoxane (m-MAO) was prepared for styrene syndiospecific polymerization. The influences of the contents of trimethylaluminum (TMA) in m-MAO and external addition of tri-isobutylaluminum (TIBA) on the distribution of the oxidation states of titanium were investigated in detail. The Ti (III) is in favour of styrene syndiospecific polymerization in higher catalytic activity.

关键词： metallocene syndiotactic polystyrene methylaluminoxane