检索结果-南通市图书馆

同方期刊数据库

DTCWT-based zinc fast roughing working condition identification

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Chemical Engineering 2018年第8期26卷 1721-1726页

作者： zhuo he Zhaohui Tang Zhihao Yan Jinping Liu College of Information Science and Enineering Central South University Changsha 410083China Key Laboratory of High Performance Computing and Stochastic Information Processing of Ministry of Education of China College of Mathematics and Computer ScienceHunan Normal UniversityChangsha 410081China

The surface texture of mineral flotation froth is well acknowledged as an important index of the flotation *** surface texture feature closely relates to the flotation working conditions and hence can be used as a visual indicator for the zinc fast roughing working condition. A novel working condition identification method based on the dual-tree complex wavelet transform(DTCWT) is proposed for process monitoring of zinc fast ***-level DTCWT is implemented to decompose the froth image into different directions and resolutions in advance, and then the energy parameter of each sub-image is extracted as the froth texture feature. Then, an improved random forest integrated classification(i RFIC) with 10-fold cross-validation model is introduced as the classifier to identify the roughing working condition, which effectively improves the shortcomings of the single model and overcomes the characteristic redundancy but achieves higher generalization performance. Extensive experiments have verified the effectiveness of the proposed method.

关键词： DTCWT Working condition Integrated classification model Zinc fast roughing

Synthesis and Characterization of Amphiphific Block Copolymer Containing PVP and Poly（5-benzyloxytrimethylene carbonate）

在线全文

学校读者我要写书评

暂无评论

Chinese Chemical Letters 2006年第2期17卷 239-242页

作者： Ying Xia WANG Feng he Ren Xi zhuo Key Laboratory of Biomedical Polymers of Ministry of Education Department of Chemistry Wuhan University Wuhan 430072

Amphiphilic copolymer of 5-benzyloxytrimethylene carbonate （BTMC） with poly （vinyl pyrrolidone）（PVP） was successfully synthesized using immobilized porcine pancreas lipase （IPPL） or SnOct2 as catalyst. Hydroxyl terminated PVP, synthesized with 2-mercaptoethanol as a chain transfer reagent, was employed as a rnacroinitiator. The resulting copolymers were characterized by GPC, ^1H NMR and IR. Increasing the BTMC/PVP-OH feed ratio （[B]/[P]） resulted in the increase of Mn of corresponding copolymers and the decrease of Mw/Mn. Immobilized enzyme has comparable catalytic activity to SnOct2 for the copolymerization.

关键词： Amphiphilic copolymer end-functionalized PVP 5-benzyloxytrimethylene carbonate,immobilized enzyme ring-opening polymerization macroinitiator.

Preparation,crystallization,and wetting of ZnO-Al_2O_3-B_2O_3-SiO_2 glass-ceramics for sealing to Kovar

在线全文

学校读者我要写书评

暂无评论

International Journal of Minerals,Metallurgy and Materials 2009年第5期16卷 586-591页

作者： Mao Wu Xin-bo he zhuo-shen Shen Xuan-hui Qu School of Materials Science and Engineering University of Science and Technology Beijing Beijing 100083 China

A novel type of ZnO-Al2O3-B2O3-SiO2 glass-ceramics sealing to Kovar in electronic packaging was developed, whose thermal expansion coefficient and electrical resistance are 5.2× 10^-6/℃ and over 1×10^13 Ω·cm, respectively. The major crystalline phases in the glass-ceramic seals were ZnAl2O4, ZnB2O4, and NaSiAl2O4. The dielectric resistance of the glass-ceramic could be remarkably enhanced through the control of alkali metal ions into crystal lattices. It was found that crystallization happened first on the surface of the sample, leaving the amorphous phase in the inner, which made the glass suitable for sealing. The glass-ceramic showed better wetting on the Kovar surface, and sealing atmosphere and temperature had great effect on the wetting angle. Strong interracial bonding was obtained, which was mainly attributed to the interracial reaction between SiO2 and FeO or Fe3O4.

关键词： electronic packaging materials glass-ceramic crystallization wetting sealing

A Pair of Mixed Generalized Sylvester Matrix Equations

在线全文

学校读者我要写书评

暂无评论

上海大学学报（自然科学版） 2014年第2期20卷 138-156页

作者： he zhuo-heng WANG Qing-wen College of Sciences Shanghai University

In this paper,some necessary and sufficient solvability conditions for the system of mixed generalized Sylvester matrix equations A_1X-YB_1=C_1,A_2Y-ZB_2=C_2 are derived,and an expression of the general solution to this system is given when it is *** ranks of the solution,and admissible ranks and inertias of the hermitian part of the solution are investigated,*** an application of the above system,solvability conditions and the general hermitian solution to the generalized Sylvester matrix equation are ***,we provide an algorithm and an example to illustrate our results.

关键词：应用数学数学分析数学理论数学概念

Interspecies Phylogenetic Analysis of Clonorchis sinensis in High-incidence Areas of Hunan Province, China

在线全文

学校读者我要写书评

暂无评论

Biomedical and Environmental Sciences 2021年第11期34卷 881-890页

作者： LONG Xiao Lei WANG Shi Ping ZHOU Shuai Feng LI Zheng Xiang ZHUANG Shi Feng he zhuo Department of Medical Parasitology Xiangya School of MedicineCentral South UniversityChangsha 410028HunanChina Hunan Provincial Center for Disease Control and prevention Changsha 410005HunanChina

Objective This study aims to investigate the infection of Clonorchis sinensis(***)in highincidence areas of Hunan Province,*** phylogenetic analysis of the *** species in the highly infected areas was carried *** Infection of the definitive human host and intermediate fish host by *** was investigated,and the mitochondrial genes cox1 and Nad1 were used as genetic markers for phylogenetic *** In 2016–2020,the average population infection rate of Hunan was 1.38%,while in Tongdao County the rate was up to 26.90%,and the highest fish infection rate was detected in Qiyang County(99.44%in the dorsal fin of crucian carp).High genetic sequence similarity was observed in the samples from Qiyang and Lengshuitan which exhibited high homology with those from Guangdong and Gansu,whereas the parasitic species from Tongdao was highly homologous with those located in high-latitude ***,no significant difference was found in the gene sequence of the parasitic species in definitive hosts dogs and *** The systematically study of *** infection in the high-incidence areas will contribute greatly to the prevention and effectively controlling the spread of Clonorchis sinensis in Hunan Province The endemic of *** infection in Hunan Province is the result of co-action of local and foreign parasite species.

关键词： Clonorchis sinensis Mitochondrial genes Coxl Nodi Phytogeny

Properties,combustion behavior,and kinetic triplets of coke produced by low-temperature oxidation and pyrolysis:Implications for heavy oil in-situ combustion

在线全文

学校读者我要写书评

暂无评论

Petroleum Science 2021年第5期18卷 1483-1491页

作者： Shuai Zhao Wan-Fen Pu Lei Su Ce Shang Yang Song Wei Li Hui-zhuo he Yi-Gang Liu Zhe-Zhi Liu State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation Southwest Petroleum UniversityChengduSichuan610500China Post-Doctorate R&D Base Southwest Petroleum UniversityChengduSichuan610500China E&D Research Institute of Liaohe Oilfield CNPC PanjinLiaoning124000China School of Oil and Gas Engineering Chongqing University of Science and TechnologyChongqing401331China

This work aimed at investigating the crucial factor in building and maintaining the combustion front during in-situ combustion(ISC),oxidized coke and pyrolyzed *** surface morphologies,elemental contents,and non-isothermal mass losses of the oxidized and pyrolyzed cokes were thoroughly *** results indicated that the oxidized coke could be combusted at a lower temperature compared to the pyrolyzed coke due primarily to their differences in the molecular polarity and *** triplets of coke combustion were determined using iso-conversional models and one advanced integral master plots *** activation energy values of the oxidized and pyrolyzed cokes varied in the range of 130-153 k J/mol and 95-120 kJ/mol,*** most appropriate reaction model of combustion of the oxidized and pyrolyzed cokes followed three-dimensional diffusion model(D_(3)) and random nucleation and subsequent growth model(F_(1)),*** observations assisted in building the numerical model of these two types of cokes to simulate the ISC process.

关键词： Oxidized coke Pyrolyzed coke heavy oil In-situ combustion Kinetic triplets

Palliative primary tumor resection provides survival beneits for the patients with metastatic colorectal cancer and low circulating levels of dehydrogenase and carcinoembryonic antigen

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Cancer 2016年第9期35卷 468-475页

作者： Wen-zhuo he Yu-Ming Rong Chang Jiang Fang-Xin Liao Chen-Xi Yin Gui-Fang Guo Hui-Juan Qiu Bei Zhang Liang-Ping Xia State Key Laboratory of Oncology in South China Collaborative Innovation Center for Cancer Medicine Sun Yat?sen University Cancer Center VIP Region Sun Yat?sen University Cancer Center

Background: It remains controversial whether palliative primary tumor resection(PPTR) can provide survival benefits to the patients with metastatic colorectal cancer(m CRC) who have unresectable metastases. The aim of this study was to evaluate whether PPTR could improve the survival of patients with m ***: We conducted a retrospective study on consecutive m CRC patients with unresectable metastases who were diagnosed at Sun Yat?sen University Cancer Center in Guangzhou, Guangdong, China, between January 2005 and December 2012. Overall survival(OS) and progression?free survival(PFS) after first?line chemotherapy failure were compared between the PPTR and non?PPTR patient ***: A total of 387 patients were identified, including 254 who underwent PPTR and 133 who did not. The median OS of the PPTR and non?PPTR groups was 20.8 and 14.8 months(P he median PFS after first?line chemotherapy was 7.3 and 4.8 months(P he PPTR and non?PPTR groups, respectively. A larger proportion of patients in the PPTR group(219 of 254, 86.2%) showed local progression compared with that of patients in the non?PPTR group(95 of 133, 71.4%; P he PPTR group and 16.2 months for the non?PPTR group; P hemo?therapy and decrease the incidence of new organ involvement. However, PPTR should be recommended only for patients with normal LDH levels and with CEA levels <70 ng/m L.

关键词：乳酸脱氢酶结直肠癌转移性患者肿瘤水福利手术切除

Vaccination against Schistosoma japonicum Infection by DNA Vaccine Encoding Sj22.7 Antigen

在线全文

学校读者我要写书评

暂无评论

Acta Biochimica et Biophysica Sinica 2007年第1期39卷 27-36页

作者： Gan DAI Shiping WANG Junlong YU Shaorui XU Xianchu PENG zhuo he Xueqin LIU Songhua ZHOU and Fen LIU Institute of Schistosomiasis Research.Xiangya School of Medicine,Central South University,Changsha 410078 China Institute of Schistosomiasis Research Xiangya School of Medicine Central South UniversityChangsha 410078 China

To observe the in vitro expression of DNA vaccine pcDNA3-Sj22.7 and its immunologicaleffect in mice,the recombinant plasmid pcDNA3-Sj22.7 was used to transfect heLa cells with liposome-mediated method and the expression of Sj22.7 mRNA and protein was examined using reversetranscription-polymerase chain reaction, sodium dodecylsulfate-polyacrylamide gel electrophoresis andWestern ***,the ability of pcDNA3-Sj22.7 to protect against Schistosoma japonicum challengeinfections was analyzed according to worm reduction rate and egg reduction rate after vaccination of *** serum levels of specific IgG antibody and T lymphocyte proliferation response were also *** the challenge infection,Sj22.7-driven interferon (IFN)-γand interleukin (IL)-4 was also *** showed that pcDNA3-Sj22.7 could express Sj22.7 mRNA and protein in *** in a worm reduction rate of 29.70%,egg reduction rate of 47.25% (liver) and 51.73% (intestine),and egg reduction rate of 25.90% (eggs per female),suggesting induction of significant anti-fecundityin the pcDNA3-Sj22.7 group. Enzyme-linked immunosorbent assay and Western blot analysis indicatedthat immunized mice generated specific IgG against Sj22.7.T lymphocytes from mice immunized withpcDNA3-Sj22.7 showed a significant proliferation response to *** culture of spleen cells showedthat secretion of IFN-γ increased but IL-4 decreased. The results indicate that DNA vaccination bypcDNA3-Sj22.7 is sufficient to elicit significant levels of protective immunity against *** *** DNA vaccine could induce significant cellular and humoral immune response,and display predominantT helper cell type 1 type immune responses,which contribute to the protective immunity against challengeinfection in mice.

关键词： response Schistosoma japonicum DNA vaccine Sj22.7 gene expression immune protection immune

AC impedance study on semiconducting properties,of anodic plumbous oxide film

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Chinese Journal of Chemistry 1990年第5期8卷 396-404页

作者： PU,Cong he zhuo-Li LIU Hou-Tian CheN Xia-Lin ZHOU Wei-Fang Department of Chemistry,Fudan University,Shanghai 200433 Department of Chemistry Fudan University Shanghai 200433

The semiconducting properties of anodic film formed on Pb in ***^(-3)H_2SO_4 solu- tion(30℃)at 0.9 V(***/Hg_2SO_4)for 2 h were studied using AC impedance *** phase composition of the film is PbSO_4 and ***_*** semiconducting properties are due to the latter. The Mott-Schottky plots show that the said film is an n-type semiconductor with flat-band potential of-0.9 V(***/Hg_2SO_4)and donor density of 1×10^(16)cm^(-3).The surface density measured at 410—2500 Hz is(2—5)×10^(12)cm^(-2)eV^(-1).

关键词： impedance anodic Schottky latter relaxation donor dense battery Conway dissolution