检索结果-南通市图书馆

Chinese Journal of Polymer Science 2016年第12期34卷 1510-1522页

作者： you Lv Hao Zhu Min-fang An Hao-jun Xu Li Zhang 王宗宝 Ningbo Key Laboratory of Specialty Polymers Faculty of Materials Science and Chemical EngineeringNingbo UniversityNingbo 315211China

The multiple endothermic peaks of poly（3-hydroxybutyrate-co-3-hydroxyvalerate）（P（HB-co-HV）） in differential scanning calorimetry （DSC） results, as one representative phenomenon of polymer with unique cocrystallization behavior, were generally considered as the results of melting/recrystallization. In this study, wide angle X-ray diffraction （WAXD） and small angle X-ray scattering （SAXS） experiments were conducted to analyze the phenomena of multiple endothermic peaks in DSC results. The results of these analyses indicated that the multiple endotherms were mainly caused by different lamellae structures. For P（HB-co-HV） with lower HV content, it was comprised of two structures of HV total exclusion and HV partial inclusion in the crystal lamellae. For P（HB-co-HV） with higher HV content, it was also comprised of two structures of HV total inclusion and HV partial inclusion in the crystal lamellae. However, only structure with HV partial inclusion in the crystal lamellae remained existing after first melting peak for all samples.

关键词： P(HB-co-HV) Isodimorphism Multiple endotherms Uniform lamellae Sandwich lamellae.

Truncated Estimator of Asymptotic Covariance Matrix in Partially Linear Models with Heteroscedastic Errors

在线全文

学校读者我要写书评

暂无评论

Acta Mathematicae Applicatae Sinica 2006年第4期22卷 565-574页

作者： Yan-meng Zhao Jin-hong you Yong Zhou Department of Mathematics Shenzhen University Shenzhen 518060 China Department of Biostatistics University of North Carolina at Chapel Hill Chapel Hill NC 27599-7400 USA Center for Statistical Research Academy of Mathematics and Systems Science Chinese Academy of Sciences Beijing 100080 China

A partially linear regression model with heteroscedastic and/or serially correlated errors is studied here. It is well known that in order to apply the semiparametric least squares estimation （SLSE） to make statistical inference a consistent estimator of the asymptotic covariance matrix is needed. The traditional residual-based estimator of the asymptotic covariance matrix is not consistent when the errors are heteroscedastic and/or serially correlated. In this paper we propose a new estimator by truncating, which is an extension of the procedure in White. This estimator is shown to be consistent when the truncating parameter converges to infinity with some rate.

关键词： Partially linear regression model heteroscedastic serially correlation semiparametric least squares estimation asymptotic covariance matrix

SCADA data based condition monitoring of wind turbines

在线全文

学校读者我要写书评

暂无评论

Advances in Manufacturing 2014年第1期2卷 61-69页

作者： Ke-Sheng Wang Vishal S.Sharma Zhen-you Zhang Department of Production and Quality Engineering NorwegianUniversity and Science and Technology Trondheim Norway Department of'Industrial and Production Engineering Dr. B .R.Ambedkar National Institute of Technology Jalandhar PunjabIndia

Wind turbines（WTs） are quite expensive pieces of equipment in power industry. Maintenance and repair is a critical activity which also consumes lots of time and effort, hence making it a costly affair. Carefully planning the maintenance based upon condition of the equipment would make the process reasonable. Mostly the WTs are equipped with some kind of condition monitoring device/system, which provides the information about the device to the central data base i.e., supervisory control and data acquisition（SCADA） data base. These devices/systems make use of data processing techniques/methods in order to detect and predict faults. The information provided by condition monitoring equipments keeps on recoding in the SCADA data base. This paper dwells upon the techniques/methods/algorithms developed, to carry out diagnosis and prognosis of the faults, based upon SCADA *** data driven approaching for SCADA data interpretation has been reviewed and an artificial intelligence（AI） based framework for fault diagnosis and prognosis of WTs using SCADA data is proposed.

关键词： SCADA data Data-driven approaches Artificial intelligence (AI) Diagnosis and prognosis ofwind turbines Central monitoring system (CMS)

True-data testbed for 5G/B5G intelligent network

在线全文

学校读者我要写书评

暂无评论

Intelligent and Converged Networks 2021年第2期2卷 133-149页

作者： Yongming Huang Shengheng Liu Cheng Zhang Xiaohu you Hequan Wu National Mobile Communications Research Laboratory Southeast UniversityNanjing 210096China Purple Mountain Laboratories Nanjing 211111China China Information and Communication Technology Group Corporation Beijing 100083China

Future beyond fifth-generation(B5G)and sixth-generation(6G)mobile communications will shift from facilitating interpersonal communications to supporting internet of everything(IoE),where intelligent communications with full integration of big data and artificial intelligence(AI)will play an important role in improving network efficiency and providing high-quality *** a rapid evolving paradigm,the AI-empowered mobile communications demand large amounts of data acquired from real network environment for systematic test and ***,we build the world’s first true-data testbed for 5G/B5G intelligent network(TTIN),which comprises 5G/B5G on-site experimental networks,data acquisition&data warehouse,and AI engine&network *** the TTIN,true network data acquisition,storage,standardization,and analysis are available,which enable system-level online verification of B5G/6G-orientated key technologies and support data-driven network optimization through the closed-loop control *** paper elaborates on the system architecture and module design of *** technical specifications and some of the established use cases are also showcased.

关键词： true-data testbed wireless communication networks artificial intelligence(AI) big data internet of everything(IoE)

Use of Major Quantitative Trait Loci to Improve Grain Yield of Rice

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

Rice science 2014年第2期21卷 65-82页

作者： GUO Long-biao YE Guo-you State Key Laboratory of Rice Biology / Chinese National Center for Rice Improvement China National Rice Research Institute Plant Breeding Genetics and Biotechnology DivisionInternational Rice Research InstituteCollege

Further improvement of rice productivity remains a challenge. Breeding is perceived as an important option to increase rice yield. However, the genetic progress of grain yield in most rice breeding programs was slow in the last decades. Although great progress in rice genomics and molecular biology has been achieved, the effect of such technological innovations on rice breeding is far small. Marker-assisted selection （MAS） for a few target quantitative trait loci （QTLs） has significant effects in improving qualitative traits, such as disease resistance. The success of MAS has therefore motivated breeders to identify and use major QTLs for yield and yield component traits. In this review, we summarized the recent methods in QTL identification, including novel statistical methods for linkage and association mapping, special population types, and whole-genome sequencing. We reviewed the successful application of marker-assisted gene introgression and gene pyramiding to improve grain yield and discussed the design of efficient MAS schemes to further increase the success rate of breeding programs. The use of well-characterized major QTLs through introgression and gene pyramiding is proven effective in improving grain yield, particularly yield under abiotic stress. Major QTLs that are stable across genetic background and growing environments are often found in less adapted germplasms, such as landraces and wild relatives. Advanced backcross QTL analysis and introgression lines, which integrate QTL discovery and utilization, are important methods for exploiting major QTLs contained in such germplasms. Next-generation sequencing substantially increases mapping resolution and accelerates the identification of casual genes underlying major QTLs. Practical guidelines derived from theoretical and empirical studies are given to guide the design of efficient marker-assisted gene introgression and pyramiding schemes.

关键词： gene pyramiding marker-assisted backcross marker-assisted selection rice yield

Multispectral Plasmon of Anisotropic Core-shell Gold Nanorods@SiO2： Dual-band Absorption Enhancement with Coupling Dye Molecules

在线全文

学校读者我要写书评

暂无评论

Chemical Research in Chinese Universities 2018年第5期34卷 772-780页

作者： CHE Yuping WANG Yang you Tingting CHANG Huaiqiu YIN Penggang ZHAI Jin Key Laboratory of Bio-inspired Smart Interfacial Science and Technology Ministry of Educate'on Beijing Key Laboratory of Bio-inspired Energy Materials and Devices School of Chemistry Beihang University Beijing 100191 R R. China Institute of Chemistry Chinese Academy of Sciences Beijing 100190 P. R. China National Center for Nanoscience and Technology Beijing 100190 P. R. China

Direct evidence of effects of surface plasmon resonance（SPR） of gold naaorods（GNRs） on dual-band light absorption enhancement with coupling dye molecules was reported by introducing gold nanorod@SiO2（GNR@SiO2） core-shell nanoparticles into a photoelectric conversion system. GNR with asymmetric shape had unusual anisotropic SPR[transversal surface plasmon resonance（TSPR） and longitudinal surface plasmon resonance（LSPR）]. The excel- lent SPR of GNR made it a promising candidate as enhancing light absorption material to increase power conversion efflciency（PCE）. The PCE was improved nearly 17.2% upon incorporating GNRs, mostly due to the increase in Jsc, while Vo~ and FF were unchanged. The improvement was mostly contributed by the SPR of the GNRs with coupling of N719. And there was also a complementary to N719 in visible light range. Therefore, SPR is an effective tool in improving the photocurrent and consequently enhancement of PCE. The TSPR and LSPR effects of GNRs on light harvesting were reflected in the increased monochromatic incident photon-to-electron conversion efficiency（IPCE）. We also utilized finite-difference tirne-domain（FDTD） to investigate the light coupling of GNRs with TiO2. Compare to the base anode, the IPCE of optimized electrode showed significant improvement and peaks broadening at 500--600 nm and 610--710 nm. We got an increase in overall conversion efficiency from 6.4% to 7.5%.

关键词： Gold nanorod Plasmon Dual-band absorption Dye-sensitized solar cell(DSSC) N719

Treatment Frequency and Long-term Efficacy Observation on Electric Pudendal Nerve Stimulation for Stress Urinary Incontinence

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

Journal of Acupuncture and Tuina Science 2013年第3期11卷 177-180页

作者： Zhao Lin Wang Si-you Nephrology Department Longhua Hospital Affiliated to Shanghai University of Traditional Chinese Medicine Shanghai Research Institute of Acupuncture and Meridian

Objective： To observe the effect of different treatment frequency of electric pudendal nerve stimulation （EPNS） on stress urinary incontinence （SUl）. Methods： A total of 60 female SUl cases were randomly allocated into group A and group B, 30 in each group. Cases in both groups were treated with EPNS, 3 times a week for group A, versus twice a week for group B. Then clinical symptoms, stress urinary incontinence and quality of life （QOL） were assessed respectively before treatment and after 12 times of treatment by using questionnaire. In addition, for 99 cases whose clinical symptom scores were reduced by more than 50% after EPNS treatment, a telephone interview follow-up was conducted. Results： The cases in the treatment group were better than those in the control group in the enhancement of clinical effects, the decline of VAS scores and the improvement of clinical symptoms and sign integrals, with statistical significance （P〈0.01 or P〈0.05）. Conclusion： EPNS has positive effect for female SUl; different treatment frequencies have certain impact on clinical effect： the effect achieved by 3 times a week was better than that by twice a week; and this therapy has stable long-term effect.

关键词： Acupuncture Therapy Electroacupuncture Urinary Incontinence, Stress

Multi-shell nanocomposites based multienzyme mimetics for efficient intracellular antioxidation

在线全文

学校读者我要写书评

暂无评论

Nano Research 2021年第8期14卷 2644-2653页

作者： Yongjian Ai Jinzhi you Jianyi Gao Jiaping Wang Hong-bin Sun Mingyu Ding Qionglin Liang MOE Key Laboratory ofBioorganic Phosphorus Chemistry&Chemical Biology Beijing Key Lab of Microanalytical Methods&InstrumentationCenter for Synthetic and Systems BiologyDepartment of ChemistryTsinghua UniversityBeijing 100084China China Astronaut Research and Training Center Beijing 100094China Department of Chemistry Northeastern UniversityShenyang 110819China

Oxidative stress is associated with many acute and chronic inflammatory *** of nanomaterial-based enzyme mimetics for reactive oxygen species(ROS)scavenging is challenging,but holds great promise for the treatment of inflammatory ***,we report the highly ordered manganese dioxide encapsulated selenium-melanin(Se@Me@MnO_(2))nanozyme with high efficiency for intracellular antioxidation and *** Se@Me@MnO_(2)nanozyme is sequentially fabricated through the radical polymerization and the in-situ *** vitro experimental results demonstrated that the Se@Me@MnO_(2) nanozyme exhibits multiple enzyme activities to scavenge ROS,including catalase(CAT),glutathione peroxidase(GPx)and superoxide dismutase(SOD).Mechanism researches illustrated that the Se core possesses GPx-like catalytic activity,the Me and the MnO_(2) possess both the SOD-like and the CAT-like ***’s more,due to the stable unpaired electrons existing in the nanozyme,the Se,Me and MnO_(2) provide synergistic and fast electron transfer effect to achieve the quickly scavenging of hydrogen peroxide,hydroxyl radical,and superoxide *** in vivo experimental results showed that this biocompatible nanozyme exhibits cytoprotective effects by resisting ROS-mediated damage,thereby alleviating the *** multienzyme mimetics is believed to be an excellent ROS scavenger and have a good potential in clinical therapy for ROS-related diseases.

关键词： oxidative stress reactive oxygen species multienzyme mimetics nanozymes intracellular antioxidation anti-inflammation

Multifunctional Langmuir-Blodgett film of an Amphiphilic Benziminazole Styryl Dye

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

Chemical Research in Chinese Universities 2002年第3期18卷 325-329页

作者： ZHENG Jie LI Fu you HUANG Chun hui YU An Chi ZHAO Xin Sheng State Key Laboratory of Rare Earth Materials Chemistry and Applications and the University of Hong Kong Joint Laboratory on Rare Earth Materials and Bioinorgani Chemistry Peking UniversityBeijing 100871P.R.China College of Chemistry and Molecular Engineering Peking UniversityBeijing 100871P.R.China

An amphiphilic benziminazole styryl dye, 2 (4 dihexadecylaminostyryl)benziminazolium TCNQ -(DBTCNQ), was synthesized and successfully transferred onto the substrates by Langmuir Blodgett(LB) technique. H aggregates were formed on the substrates. Its monolayer second order susceptibility[ χ (2) zzz = 109 p/mV) was determined with a polarized laser beam(Nd∶YAG, λ =1.064 μm). The photoelectrochemistry of the dye LB monolayer films was investigated in a traditional three electrode cell. The quantum efficiency of photoelectric conversion is 1.08% under favorable conditions [-200 mV, 0.5 mg/mL methylviologen diiodide(MV 2+ ) in 0.5 mol/L KCl electrolyte solution]. The experimental data indicate that the LB film exhibits multifunctional properties.

关键词： Multifunction Langmuir Blodgett films Benziminazole styryl dye

Prevalence and risk factors of fatty liver disease in Chengdu,Southwest China

在线全文

学校读者我要写书评

暂无评论

Hepatobiliary & Pancreatic Diseases International 2009年第4期8卷 377-382页

作者： Li, Hong Wang, you-Juan Tan, Ke Zeng, Li Liu, Li Liu, Feng-Jun Zhou, Tao-you Chen, En-Qiang Tang, Hong Sichuan Univ W China Hosp Natl Key Lab Biotherapy Div Mol Biol Infect DisCtr Infect Dis Chengdu 610041 Peoples R China W China Hosp Phys Examinat Ctr Chengdu 610041 Peoples R China Sichuan Univ Dept Hlth Stat W China Coll Publ Hlth Chengdu 610041 Peoples R China

BACKGROUND: Fatty liver disease (FLD) is increasingly recognized as one of the most common chronic liver diseases in China. This study aimed to investigate the prevalence and risk factors of FLD in Chengdu, Southwest China, and to provide a relevant basis for the prevention and intervention of FLD. METHODS: Altogether 9094 subjects (4721 men and 4373 women) of over 18 years old who had received a medical checkup in the West China Hospital of Sichuan University between January and December 2007 were evaluated for FLD. FLD was diagnosed by ultrasonography. Body mass index (BMI), height, body weight, blood pressure, fasting plasma glucose (FPG), triglycerides (TG), total cholesterol (TCh), alanine aminotransferase (ALT), hepatitis B surface antigen (HBsAg), high-density lipoprotein cholesterol (HDL-C), and low-density lipoprotein cholesterol (LDL-C) were measured using routine laboratory methods. RESULTS: The overall prevalence of FLD was 12.5%, which was more than 3-fold higher in males than in females 2 (18.9% vs. 5.7%, chi(2) =359.624, P<0.001). The prevalence increased with age in females and males of less than 50 years. The prevalence of alcoholic, suspected alcoholic, and non-alcoholic FLD was 2.6%, 3.6%, and 6.3%, respectively. Multiple logistic regression analyses showed that 10 factors (male sex, age, BMI, FPG, hypertension, TG, TCh, HDL-C, LDL-C, and ALT abnormalities) were closely related to FLD. In heavy drinkers, obesity increased the risk of FLD by 23.78-fold (95% CI, 10.22-55.33), but heavy drinking was only associated with a 2-fold (95% CI, 1.50-2.66) increased risk in obese subjects. CONCLUSIONS: The prevalence of FLD among a health-checkup population in Chengdu, Southwest China was lower than the published for other areas of China. FLD in Chengdu adults was found to be closely associated with sex, age, BMI, and other metabolic syndrome features.

关键词： fatty liver prevalence risk factors obesity alcohols