检索结果-南通市图书馆

Vanishing of Tate Homology - An Application of Stable Homology for Complexes

在线全文

学校读者我要写书评

暂无评论

Acta Mathematica Sinica,English Series 2016年第7期32卷 831-844页

作者： yan Ping LIU Zhong Kui LIU xiao yan yang Department of Mathematics Northwest Normal University Lanzhou 730070 P. R. China

It has been proved that the vanishing of Tare homology is a sufficient condition for the derived depth formula to hold in [J. Pure Appl. Algebra, 219, 464-481 （2015）]. In this paper, we inves- tigate when Tate homology vanishes by studying the stable homology theory for complexes. Properties such as the balancedness and vanishing of stable homology for complexes are studied. Our results show that the vanishing of this homology can detect finiteness of homological dimensions of complexes and regularness of rings.

关键词： Tate homology stable homology complete projective resolution

Singularity Categories with Respect to Ding Projective Modules

在线全文

学校读者我要写书评

暂无评论

Acta Mathematica Sinica,English Series 2017年第6期33卷 793-806页

作者： Wen Jing CHEN Zhong Kui LIU xiao yan yang Department of Mathematics Northwest Normal University Lanzhou 730070 P. R. China

Abstract We introduce the singularity category with respect to Ding projective modules, Db dpsg（R）, as the Verdier quotient of Ding derived category Db DP（R） by triangulated subcategory Kb（DP）, and give some triangle equivalences. Assume DP is precovering. We show that Db DP（R） ≌K-,dpb（DP） and Dbpsg（R） ≌ DbDdefect（R）. We prove that each R-module is of finite Ding projective dimension if and only if Dbdpsg（R） = 0.

关键词： Ding projective module Ding singularity category Ding defect category

Coupled dynamic response analysis of multi-column floating offshore wind turbine with low center of gravity

在线全文

学校读者我要写书评

暂无评论

Journal of Ocean Engineering and Science 2024年第1期9卷 25-39页

作者： Jie yang yan-ping He Yong-sheng Zhao xiao-yan yang Guo-rong Zhang State Key Laboratory of Ocean Engineering Shanghai Jiao Tong UniversityShanghai 200240China Collaborative Innovation Center for Advanced Ship and Deep-Sea Exploration(CISSE) Shanghai Jiao Tong UniversityShanghai 200240China School of Naval Architecture Ocean&Civil EngineeringShanghai Jiao Tong UniversityShanghai 200240China Faculty of Maritime and Transportation Ningbo UniversityNingbo 315211China

To realize the application of the floating offshore wind turbine(FOWT)from deep to relatively shallow waters,a new concept of multi-column floating wind turbine platform with low center of gravity(CG)is designed and *** multi-column low CG platform is designed to support a 6MW wind turbine class and operated at a water depth of 50m in the South China *** frequency domain software WADAM and time domain software NREL-FAST are used to simulate coupled dynamic responses of the floating wind turbine system with second-order wave loads *** dynamic behaviors of multi-column low CG FOWT system under normal operation and parked conditions are *** influence of second-order wave force on the motion responses of the multi-column platform,fore-aft force and moment of the tower base and mooring force are researched *** results demonstrate that the coupled dynamic responses at rated operating condition and extreme condition meet the normal operating requirements and extreme survival requirements of FOWT system in the shallow water(50m)of South China *** addition,it is found that,the wave frequency response gradually replaces the second-order low frequency response as the main influencing factor of the coupled dynamic response of the FOWT system with the increasing severity of the sea ***,in general,the magnitude of second-order low frequency response increases with the increasing severity of the design load ***,in the subsequent design of the shallow water FOWT system,the second-order effects should be paid enough attention.

关键词： Floating offshore wind turbine Multi-column platform Second-order wave force Concept design Coupled dynamic response

Successful treatment of pulmonary hypertension in a neonate with bronchopulmonary dysplasia: A case report and literature review

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 Clinical Cases 2022年第32期10卷 11898-11907页

作者： Jiao Li Jing Zhao xiao-yan yang Jing Shi Hai-Ting Liu Department of Pediatrics West China Second University HospitalSichuan UniversityChengdu 610041Sichuan ProvinceChina Neonatal Ward West China Second University HospitalSichuan UniversityChengdu 610066Sichuan ProvinceChina

BACKGROUND Pulmonary hypertension(PH)is a severe complication of bronchopulmonary dysplasia(BPD)in premature neonates and is closely related to ***,there is no effective and safe treatment for PH due to BPD in *** treatment for cases of BPD-associated PH with Tadalafil combined with bosentan is *** case may make a significant contribution to the literature because PH is difficult to manage as a serious complication of BPD in preterm *** is high,especially when it is complicated by heart *** SUMMARY An extremely premature neonate with a gestational age of 26+5 wk and birth weight of 0.83 kg was diagnosed with BPD associated with PH;oral sildenafil did not improve the *** infant experienced sudden cardiac arrest and serious heart failure with severe *** a series of treatments,including cardiopulmonary resuscitation,mechanical ventilation,and inhaled nitric oxide(iNO),the respiratory and circulatory status improved but the pulmonary artery pressure remained *** oral sildenafil was replaced with oral tadalafil and bosentan;pulmonary artery pressure improved,and the infant recovered at our *** 2 years of follow-up,she is in good condition,without any cardiovascular *** INO can effectively improve the respiratory and circulatory status of infants with PH associated with premature BPD.B-type natriuretic peptide should be routinely measured during hospitalization to evaluate the risk and prognosis of BPD-associated PH in preterm *** combined with bosentan for the treatment of PH associated with premature BPD was better than sildenafil in this *** studies are needed to explore the efficacy and safety of different vasodilators in the treatment of PH associated with premature BPD.

关键词： Premature Bronchopulmonary dysplasia Pulmonary hypertension Treatment Case report

Changes of the Molecular Mobility of Poly(ε-caprolactone) upon Drawing,Studied by Dielectric Relaxation Spectroscopy

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 Journal of Polymer Science 2018年第5期36卷 665-674页

作者： xiao-yan yang Shao-Shuai Liu AlexANDer V.Korobko Stephen J.Picken Nicolaas A.M.Besseling Lucky Research Institute China Lucky Group Corporation Department of Chemical Engineering Delft University of Technology 2628 BL Delft and Dutch Polymer Institute(DPI)

Dielectric relaxation spectroscopy（DRS） of poly（ε-caprolactone） with different draw ratios showed that the mobility of polymer chains in the amorphous part decreases as the draw ratio increases. The activation energy of the α process, which corresponds to the dynamic glass transition, increases upon drawing. The enlarged gap between the activation energies of the α process and the β process results in a change of continuity at the crossover between the high temperature a process and the α and β processes. At low drawing ratios the a process connects with the β process, while at the highest drawing ratio in our measurements, the a process is continuous with the αprocess. This is consistent with X-ray diffraction results that indicate that upon drawing the polymer chains in the amorphous part align and densify upon drawing. As the draw ratio increases, the α relaxation broadens and decreases its intensity, indicating an increasing heterogeneity. We observed slope changes in the α traces, when the temperature decreases below that at which τα≈ 1 s. This may indicate the glass transition from the ‘rubbery＇ state to the non-equilibrium glassy state.

关键词： Semicrystalline polymer Dielectric relaxation spectroscopy Molecular mobility

Expression and significance of pigment epithelium-derived factor and vascular endothelial growth factor in colorectal adenoma and cancer

在线全文

学校读者我要写书评

暂无评论

World Journal of Gastrointestinal Oncology 2024年第3期16卷 670-686页

作者： Ye yang Wu Wen Feng-Lin Chen Ying-Jie Zhang xiao-Cong Liu xiao-yan yang Shan-Shan Hu Ye Jiang Jing Yuan Digestive Diseases Chengdu Qingbaijiang District People's HospitalChengdu 610300Sichuan ProvinceChina Digestive Diseases Chengdu Second People’s HospitalChengdu 610000Sichuan ProvinceChina Graduate School Chengdu Medical CollegeChengdu 610000Sichuan ProvinceChina

BACKGROUND The incidence and mortality of colorectal cancer(CRC)are among the highest in the world,and its occurrence and development are closely related to tumor *** the balance between pigment epithelium-derived factors(PEDF)that inhibit angiogenesis and vascular endothelial growth factors(VEGF)that stimulate angiogenesis is broken,angiogenesis is out of control,resulting in tumor ***,it is very necessary to find more therapeutic targets for CRC for early intervention and later *** To investigate the expression and significance of PEDF,VEGF,and CD31-stained microvessel density values(CD31-MVD)in normal colorectal mucosa,adenoma,and *** In this case-control study,we collected archived wax blocks of specimens from the Digestive Endoscopy Center and the General Surgery Department of Chengdu Second People's Hospital from April 2022 to October *** cases of specimen wax blocks were selected as normal intestinal mucosa confirmed by electronic colonoscopy and concurrent biopsy(normal control group),50 cases of specimen wax blocks were selected as colorectal adenoma confirmed by electronic colonoscopy and pathological biopsy(adenoma group),and 50 cases of specimen wax blocks were selected as CRC confirmed by postoperative pathological biopsy after inpatient operation of general surgery(CRC group).An immunohistochemical staining experiment was carried out to detect PEDF and VEGF expression in three groups of specimens,analyze their differences,study the relationship between the two and clinicopathological factors in CRC group,record CD31-MVD in the three groups,and analyze the correlation of PEDF,VEGF,and CD31-MVD in the colorectal adenoma group and the CRC *** F test or adjusted F test is used to analyze measurement data ***-Wallis rank sum test was used between groups for ranked *** chi-square test,adjusted chi-square test,or Fisher's exact test were used to compare the rates betwe

关键词： Pigment epithelium-derived factors Vascular endothelial growth factor Microvessel density Colorectal adenoma Colorectal cancer Targeted therapy

Arterial embolism caused by a peripherally inserted central catheter in a very premature infant:A case report and literature review

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 Clinical Cases 2020年第18期8卷 4259-4265页

作者： Yi-Fei Huang yan-Ling Hu Xing-Li Wan Hong Cheng Yao-Hua Wu xiao-yan yang Jing Shi Department of Neonatal Nursing West China Second University HospitalSichuan UniversityChengdu 610066Sichuan ProvinceChina Key Laboratory of Birth Defects and Related Diseases of Women and Children Sichuan UniversityChengdu 610066Sichuan ProvinceChina Ministry of Education West China Nursing SchoolSichuan UniversityChengdu 610066Sichuan ProvinceChina

BACKGROUND Extremely premature infants have poor vascular *** often choose deep veins such as the femoral vein and axillary vein to peripherally insert central catheters,and these vessels are often accompanied by arteries;thus,it is easy to mistakenly enter the *** SUMMARY The case of an extremely premature infant(born at gestational age 28+3)in whom the left upper extremity artery was accidentally entered during peripheral puncture of the central venous catheter is *** the 19th day of hospitalization,the index finger,middle finger and ring finger of the left hand were rosy,the left radial artery and brachial artery pulse were palpable,the recovery was 95%,and the improvement was *** discharge 42 d after admission,there was no abnormality in fingertip activity during the follow-up *** Arterial embolization in preterm infants requires an individualized treatment strategy combined with local anticoagulation and 2%nitroglycerin ointment for local tissue damage caused by arterial embolism in the upper *** visualization of disease changes using image visualization increases the likelihood of a good outcome.

关键词： Arterial thrombosis Anticoagulation Nitroglycerin Peripherally inserted central catheters Case report

Sirolimus can promote the disappearance of renal angiomyolipoma associated with tuberous sclerosis complex:a prospective cohort study

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 Pediatrics 2024年第6期20卷 602-610页

作者： Shuo Dun yang-yang Wang Lin Wan Qiu-Hong Wang Qian Lu xiao-yan yang Qi Zhang Hui-Min Chen Lu-Peng Qiu Li-Ping Zou Medical School of Chinese PLA Beijing 100853China Department of Pediatrics The First Medical CenterChinese PLA General HospitalBeijing 100853China Center of Epilepsy Beijing Institute for Brain DisordersBeijing 100069China

Background Renal angiomyolipoma(RAML)is the most common kidney lesion in patients with tuberous sclerosis complex(TSC),affecting about 80%of *** is a benign tumor that grows over time,usually bilaterally,and can easily lead to kidney complications such as acute ***,we investigated the efficacy and safety of sirolimus in children with TSC-associated RAML and explored the factors affecting tumor disappearance under sirolimus treatment through subgroup *** A prospective cohort study was *** was initiated at 1 mg/(m^(2)×day),and dose adjustments were made by a 2-week titration period to attain a trough blood concentration of 5-10 ng/*** disappearance of RAML in chil-dren after sirolimus treatment was observed,and Cox regression was used to screen the factors affecting tumor *** One hundred and twenty-six patients who met the criteria were *** 3 months,6 months,12 months,and 24 months of follow-up,tumors disappeared in 18(14.3%),30(23.8%),39(31.0%),and 42(33.3%)children,*** disappeared in 50(39.7%)children by the last visit of each individual,and 30(60%)of them occurred within 6 *** multivariate Cox regression analysis showed that patients with a smaller maximum tumor diameter at baseline had a higher tumor disappearance ***-six(29%)patients had stomatitis during the entire treatment period,and no serious *** Sirolimus could promote the disappearance of TSC-related *** disappearance rate was correlated with the maximum diameter at baseline,and the smaller the tumor was,the higher the disappearance *** is well tolerated in the treatment of RAML associated with TSC.

关键词： Angiomyolipoma mTOR inhibitor Sirolimus Tuberous sclerosis

Elastoplastical analysis on cylinder of different moduli in tension and compression

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 Coal Science & Engineering(China) 2009年第1期15卷 66-71页

作者： WANG Wei-ming ZHANG xiao-yan yang Zhao WANG Qing-biao College of Civil Engineering and Architecture Shangdong University of Science and Technology Qingdao 266510 China

The constitutive equation was deduced. The results were obtained from theelastic and elastoplastical analysis of the cylinder sample applied with different ratios ofload on both the inner and outer sides and different moduli ratio. The factors affecting thedevelopment of the plastic field of the cylinder with finite radius were shown. The resultsshow that the different moduli ratio is the most important factor in the development of theplastic zone. The slight fluctuation of the ratio will bring multiplied increment of the displacement, which may result in the final destruction of the engineering material.

关键词： cylinder different moduli plastic zone elastoplastical analysis