检索结果-南通市图书馆

The diurnal variation of polarization characteristics of the Earth treated as an exoplanet

在线全文

学校读者我要写书评

暂无评论

Research in Astronomy and Astrophysics 2019年第8期19卷 115-122页

作者： shuang Wang zhong-Quan Qu Hao Li Yunnan Observatories Chinese Academy of SciencesKunming650011China University of Chinese Academy of Sciences Beijing100049China Center for Astronomical Mega-Science Chinese Academy of SciencesBeijing100101China

The diurnal polarization variation of the Earth, treated as an exoplanet with an unresolved disk but resolvable from its host star, is presented in three wavelength bands centered at 490 nm, 670 nm and865 nm respectively according to French satellite-borne PARASOL data. We aim to estimate disk-integrated polarization of the Earth with a phase angle of 55?. It is shown that:(1) the linear polarization signal and its variation are ascribed to the combination of surface feature distribution and atmospheric conditions acting as a variable polarimetric modulator;and(2) the polarimetric wavelength dependence is strong due to the atmospheric wavelength sensitivity. During the period when the PARASOL data were acquired, the cloud coverage ranged from 44.0% to 57.7%, and the polarimetric diurnal variation amplitude was within 1.8%in the 490 nm band, 1.3% in the 670 nm band and 1.5% in the 865 nm band.

关键词： techniques:photometric methods:data analysis Earth

Composite Quantile Estimation for Kink Model with Longitudinal Data

在线全文

学校读者我要写书评

暂无评论

Acta Mathematica Sinica,English Series 2023年第3期39卷 412-438页

作者： Chuang WAN Wei zhong ying FANG School of Statistics and Data Science Nankai UniversityTianjin 300071P.R.China MOE Key Lab of Econometrics WISEDepartment of Statistics and Data ScienceSchool of EconomicsXiamen UniversityXiamen 361000P.R.China

Kink model is developed to analyze the data where the regression function is two-stage piecewise linear with respect to the threshold covariate but continuous at an unknown kink *** quantile regression for longitudinal data,kink point where the kink effect happens is often assumed to be heterogeneous across different ***,the kink point tends to be the same across different quantiles,especially in a region of neighboring quantile *** such homogeneity information could increase the estimation efficiency of the common kink *** this paper,we propose a composite quantile estimation approach for the common kink point by combining information from multiple neighboring *** normality of the proposed estimator is *** addition,we also develop a sup-likelihood-ratio test to check the existence of the kink effect at a given quantile level.A test-inversion confidence interval for the common kink point is also developed based on the quantile rank score *** simulation studies show that the proposed composite kink estimator is more efficient than the single quantile regression *** also illustrate the proposed method via an application to a longitudinal data set on blood pressure and body mass index.

关键词： Asymptotical normality composite quantile estimation estimation efficiency kink design model longitudinal data

同方期刊数据库

Group Buying of Competing Retailers with Fairness Concerns

在线全文

学校读者我要写书评

暂无评论

Journal of Systems Science and Systems Engineering 2020年第6期29卷 655-674页

作者： Na He zhong-zhong Jiang Minghe Sun ying Sheng School of Business Administration&Institute of Behavioral and Service Operations Management Northeastern UniversityShenyang 110167China bKey Laboratory of Data Analytics and Optimization for Smart Industry(Northeastern University) Ministry of EducationShenyang 110819China Department of Management Science and Statistics College of BusinessThe University of Texas at San AntonioSan Antonio TX 78249USA College of Sciences Northeastern UniversityShenyang 110819China

The fairness concern behavior is particularly common among members in supply chain *** downstream retailers often compare their profits with those of the other members in the supply chain,especially that of the supplier,and do not like the unfavorable distribution of the total *** work considers a supply chain consisting of a supplier and two competing retailers with fairness *** supplier offers a wholesale contract with quantity discount,and the two competing retailers have the options of individual purchasing and group *** a Stackelberg game model,the optimal decisions for the players are obtained for the group buying and the individual purchasing *** results indicate that the supplier benefits more than the retailers from the group buying *** particular,the group buying strategy gives the supplier a higher profit if the operational cost of group buying is below a ***,the fairness concern behavior of the retailers does not always hurt the profit of the ***,the supplier will benefit from the fairness concern behavior of the retailers in individual purchasing when the retailers operates in a relatively poor ***,market competition between the two fairness concerned retailers does not always benefit the *** competition between the fairness concerned retailers reduces the supplier's profit if the group buying strategy is used when the retailers operates in a relatively poor environment.

关键词： Group buying individual purchasing stackelberg game fairness concerns supply chain

Inflammatory cytokine gene polymorphisms increase the risk of atrophic gastritis and intestinal metaplasia

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

World Journal of Gastroenterology 2010年第14期16卷 1788-1794页

作者： Li, zhong-Wu Wu, ying Sun, Yu Liu, Lu-ying Tian, Meng-Meng Feng, Guo-shuang You, Wei-Cheng Li, Ji-You Peking Univ Key Lab Carcinogenesis & Translat Res Minist Educ Dept PatholSch OncolBeijing Canc Hosp & Inst Beijing 100142 Peoples R China Peking Univ Key Lab Carcinogenesis & Translat Res Minist Educ Dept EpidemiolSch OncolBeijing Canc Hosp & Inst Beijing 100142 Peoples R China

AIM: To investigate the effects of interleukin-8 (IL-8 ), macrophage migration inhibitory factor (MIF ) gene polymorphisms, Helicobacter pylori (H. pylori ) infection, on the risk of developing severe chronic atrophic gastritis (SCAG) and intestinal metaplasia (IM). METHODS: A total of 372 cases were selected from a cohort study in Linqu County, a high risk area for gastric cancer (GC) in northern China. To obtain a sufficient group size, patients with normal or superficial gastritis were included. Based on an average follow-up period of 56 mo, the 372 cases were divided into no progres-sion group (no histological progression from normal or superficial gastritis, n = 137), group Ⅰ (progressed from normal or superficial gastritis to SCAG, n = 134) and group Ⅱ (progressed from normal or superficial gastritis to IM, n = 101). IL-8 , MIF gene polymorphisms were detected by polymerase chain reaction-based denaturing high-performance liquid chromatography analysis and DNA sequencing. RESULTS: An increased risk of SCAG was found in subjects with IL-8-251 AA genotype [odds ratio (OR) = 2.62, 95% CI: 1.23-5.72] or IL-8-251 A allele carriers (AA + AT) (OR = 1.81, 95% CI: 1.06-3.09). An elevated risk of IM was found in subjects with IL-8-251 AT genotype (OR = 2.27, 95% CI: 1.25-4.14) or IL-8-251 A allele carriers (OR = 2.07, 95% CI: 1.16-3.69). An increased risk of SCAG was found in subjects with MIF-173 GC genotype (OR = 2.36, 95% CI: 1.38-4.02) or MIF-173 C allele carriers (GC + CC) (OR = 2.07, 95% CI: 1.21-3.55). An elevated risk of IM was found in subjects with MIF-173 CC genotype (OR = 2.27, 95% CI: 1.16-4.46) or MIF-173 C allele carriers (OR = 3.84, 95% CI: 1.58-9.34). The risk of SCAG and IM was more evident in subjects carrying IL-8-251 A allele (OR = 6.70, 95% CI: 1.29-9.78) or MIF-173 C allele (OR = 6.54, 95% CI: 2.97-14.20) and positive for H. pylori infection. CONCLUSION: IL-8-251 and MIF-173 gene polymorphisms are significantly associated with the risk of SCAG and

关键词： Chronic atrophic gastritis Gene polymorphisms Helicobacter pylori Interleukin-8 Intestinal metaplasia Macrophage migration inhibitory factor

PREDICTION OF SEDIMENT REDUCING BENEFIT UNDER DIFFERENT RAINFALL COND ITIONS AND CONTROL DEGREES ON THE LOESS PLATEAU

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

Chinese Geographical Science 2003年第2期13卷 149-156页

作者： JIAOJu-ying WANGWan-zhong InstituteofSoilandWaterConservation ChineseAcademyofSciencesandMinistryofWaterResourcesYangling712100P.R.China NorthwestSci-technologyUniversityofAgricultureandForestry Yangling712100P.R.China

Based on the distribution of hydrological stations and zoning of types ofsoil erosion, the Loess Plateau (3 10 x 10~3km^2) is divided into 292 erosion units. And taking theerosion modulus > 5000t/km^2 as a criterion, the emphasis control area (149 x 10~3km^2) of the LoessPlateau is demarked, and is divided into 10 control regions. The controllable area and the locationof control measures are conformed. Level terraces are mainly collocated on the 3° ―15° slopes,woodland and grassland are collocated on the > 15° slopes, and the proportion of woodland tograssland is 8: 2 in the forest belt, 5: 5 in the forest steppe belt, and 2: 8 in the steppe *** 9000 combinations of soil-water conservation measures in different rainfall conditions areobtained by the permutation and combination method, according to the 9 rainfall frequencies and thecontrollable areas of level terrace, woodland and grassland at 10% of control progress rate. Thequality standards of level terrace, woodland and grassland are ascertained. The evaluation indexesof soil-water conservation benefits of level terrace, woodland and grassland are establishedrespectively in the condition that rainfall index is higher than that of erosive index of slopingfield. Based on the results above, the sediment reducing benefit and soil erosion modulus in thedifferent rainfall conditions and control degrees are analyzed, which could provide adecision-making basis for soil-water loss control on the Loess Plateau.

关键词： loess plateau rainfall soil and water conservation sediment reducingbenefit

Microwave-hydrothermal synthesis,characterization and upconversion luminescence of rice-like Gd(OH)_(3) nanorods

在线全文

学校读者我要写书评

暂无评论

Rare Metals 2022年第12期41卷 4273-4278页

作者： shuang Huang Hua-Lan Xu Lei Wang Sheng-Liang zhong College of Chemistry and Chemical Engineering Jiangxi Normal UniversityNanchang 330022China

Rice-like Gd(OH)_(3)nanorods were successfully prepared through a facile and rapid microwave-hydrothermal synthesis method without using any surfactants or templates.X-ray diffraction(XRD),Fourier transform infrared(FTIR)spectroscopy,thermogravimetric analysis(TGA),scanning electron microscopy(SEM),transmission electron microscopy(TEM),high-resolution transmission electron microscopy(HRTEM),selected area electron diffraction(SAED)and energy-dispersive spectroscopy(EDS)were used to characterize the *** show that the nanorods have an average length of 400 nm and an average diameter of 50 *** effects of reaction parameters such as reaction temperature and time on the preparation were briefly *** is found that the crucial factor for the formation of rice-like Gd(OH)3nanorods is reaction *** the rice-like Gd(OH)3nanorods was codoped with Yb^(3+)and Er^(3+),strong upconversion emissions could be observed under the excitation of 980-nm-laser,and the calculated CIE color coordinates falls within the yellow region,which may be potential candidate for optical materials.

关键词： Microwave-hydrothermal synthesis Gadolinium hydroxide Upconversion Rare earth

The Citron homology domain of MAP4Ks improves outcomes of traumatic brain injury

在线全文

学校读者我要写书评

暂无评论

Neural Regeneration Research 2025年第11期20卷 3233-3244页

作者： Xiaoling zhong Wenjiao Tai Meng-Lu Liu Shuaipeng Ma Tianjin Shen Yuhua Zou Chun-Li Zhang Department of Molecular Biology University of Texas Southwestern Medical CenterDallasTXUSA Hamon Center for Regenerative Science and Medicine University of Texas Southwestern Medical CenterDallasTXUSA Peter O’Donnell Jr.Brain Institute University of Texas Southwestern Medical CenterDallasTXUSA

The mitogen-activated protein kinase kinase kinase kinases(MAP4Ks)signaling pathway plays a pivotal role in axonal regrowth and neuronal degeneration following *** targeting this pathway is beneficial to brain injury remains *** this study,we showed that adeno-associated virus-delivery of the Citron homology domain of MAP4Ks effectively reduces traumatic brain injury-induced reactive gliosis,tauopathy,lesion size,and behavioral *** inhibition of MAP4Ks replicated the ameliorative effects observed with expression of the Citron homology ***,the Citron homology domain acted as a dominant-negative mutant,impeding MAP4K-mediated phosphorylation of the dishevelled proteins and thereby controlling the Wnt/β-catenin *** findings implicate a therapeutic potential of targeting MAP4Ks to alleviate the detrimental effects of traumatic brain injury.

关键词： adeno-associated virus Citron homology Citron homology domain gene therapy mitogen-activated protein kinase kinase kinase kinases traumatic brain injury

Electroacupuncture Attenuates Immune-Inflammatory Response in Hippocampus of Rats with Vascular Dementia by Inhibiting TLR4/MyD88 Signaling Pathway

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Integrative Medicine 2022年第2期28卷 153-161页

作者： BU Yu LI Wen-shuang LIN Ji WEI Yu-wei SUN Qiu-ying ZHU Shi-jie TANG zhong-sheng School of Basic Medicine Guizhou University of Traditional Chinese MedicineGuiyang(550025)China Department of Hematology the Second Affiliated Hospital of Guizhou University of Traditional Chinese MedicineGuiyang(550025)China

Objective:To investigate whether electroacupuncture(EA)alleviates cognitive impairment by suppressing the toll-like receptor 4(TLR4)/myeloid differentiation factor 88(MyD88)signaling pathway,which triggers immune-inflammatory responses in the hippocampus of rats with vascular dementia(VaD).Methods:The experiments were conducted in 3 parts and in total the Sprague-Dawley rats were randomly divided into 8 groups by a random number table,including sham,four-vessel occlusion(4-VO),4-VO+EA,4-VO+non-EA,sham+EA,4-VO+lipopolysaccharide(LPS),4-VO+LPS+EA,and 4-VO+TAK-242 *** VaD model was established by the 4-VO *** days later,rats were treated with EA at 5 acupoints of Baihui(DV 20),Danzhong(RN 17),Geshu(BL 17),Qihai(RN 6)and Sanyinjiao(SP 6),once per day for 3 consecutive *** subsets,lymphocyte transformation rates,and inflammatory cytokines interleukin-6(IL-6)and tumor necrosis factorα(TNF-α)were measured to assess immune function and inflammation in VaD *** electron microscopy was used to observe the ultrastructure of nerve cells in the *** levels of TLR4,MyD88,IL-6,and TNF-αwere detected after EA ***4/MyD88 signaling and cognitive function were also assessed after intracerebroventricular injection of TLR4 antagonist TAK-242 or TLR4 agonist LPS with or without ***:Compared with the 4-VO group,EA notably improved immune function of rats in the 4-VO+EA group,inhibited the protein and mRNA expressions of TLR4 and MyD88 in the hippocampus of rats,reduced the expressions of serum IL-6 and TNF-α(all P0.05).Conclusions:EA attenuated cognitive impairment associated with immune inflammation by inhibition of the TLR4/MyD88 signaling ***,EA may be a promising alternative therapy for the treatment of VaD.

关键词： electroacupuncture vascular dementia immune-inflammation toll-like receptor 4/myeloid differentiation factor 88 signaling pathway

Effect of Diamond Additions on Wettability and Distribution of SnAgCu Composite Solder

在线全文

学校读者我要写书评

暂无评论

Journal of Materials Science & Technology 2012年第7期28卷 661-665页

作者： Wei Zhang ying zhong ChunqingWang State Key Laboratory of Advanced Welding and Joining Harbin Institute of Technology Harbin 150001 China

Diamond/SnAgCu composite solder bumps were prepared on Cu pad by mechanically incorporating diamond particles into Sn3.0Ag0.5Cu （SAC） solder powders, mixing with flux and reflowing at 260℃ for 60 s. The spreading areas of composite solder were calculated and the distributions of copper-coated diamonds were characterized. When diamond additions were below 3 wt%, the spreading area decreased with diamond additions, and the diamonds distributed mainly at the interface between solder and Cu pad; however, when additions were beyond 4 wt%, the discharge of diamond particle occurred, and the spreading area increased due to the reduction of surface energy.

关键词： Sn3.0Ag0.5Cu Diamond Composite solder Chemical plating