检索结果-南通市图书馆

Broadband channel measurement and analysis

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

The Journal of China Universities of Posts and Telecommunications 2006年第3期13卷 24-28页

作者： zhang Ming zhang jian-hua jiang Jun zhang Ping WU Yu-fei Wireless Technology Innovation Labs (WTI) Beijing University of Posts and Telecommunications Beijing 100876 China

An outdoor propagation measurement campaign for beyond 3G （B3G） as well as a wide-band indoor measurement campaign have been performed recently in Beijing, China, in which the sounding signals are transmitted by an one-antenna base station and received by a two-antenna mobile receiver operated at 3.49～3.51 GHz bandwidth. Different scenarios： stationary line-of-sight （LoS）, stationary non-LoS （NLoS） scenarios, and dynamic NLoS are deliberately chosen in a classic urban environment and office environment. The initial results are presented in this article. Parameters including vector channel impulse response, path loss, rays number, excess delay spread etc. are extracted, analyzed, and briefly reported here.

关键词： Broadband measurement Beyond 3G path loss,multipath delay rays number

Transesterified Chinese Spicehush (Lindera communis) seed oil as a biodiesel fuel

在线全文

学校读者我要写书评

暂无评论

Forestry Studies in China 2007年第2期9卷 132-136页

作者： Wang Wei-gang Ma Lei jiang jian-xin jiang Li zhang Zhi-xiang College of Materials Science and Technology Beijing Forestry University Beijing 100083 P. R. China

Studies were carried out on the transesterification of the Chinese Spicehush （Lindera communis） seed （LCS） oil with methanol for the production of biodiesel. The methyl esters of LCS oil were compared with soybean esters to determine biodiesel fuel performance and properties. The fatty acids content in the seed kernel oil （LKO） and coat oil （LCO） were quantified by gas chromatography and mass spectrometry method （C-C-MS）. LKO contains 95.1% saturated acids （capric, lauric, myristic and palmitic） and 2.3% unsaturated acids （oleic）. LCO contains 24.6% saturated acids （palmitic and stearic） and 73.6% unsaturated acids （oleic, linoleic and palmitoleic）. The kinematic viscosity, cold filter plugging point, cloud point, flash point and cetane index were determined. The methyl esters of LKO had a higher kinematic viscosity and a lower cold filter plugging point value, so it has better performance in cold weather. The biodiesel of LCS oil has fuel properties within the limits prescribed by American （ASTM D 6751-02） standards, except for a slightly lower flash point of LKO biodiesel than that prescribed by these standards （130℃）. Thus, LKO and LCO biodiesel have great potential to be used on a large scale as fuel for diesel engines.

关键词： biodiesel Lindera communis oil transesterification property

Antitumor Compound Identification from Zanthoxylum bungeanum Essential Oil Based on Composition-activity Relationship

在线全文

学校读者我要写书评

暂无评论

Chemical Research in Chinese Universities 2013年第6期29卷 1068-1071页

作者： LI Zi-dan HAN Sheng-nan jiang jian-lan zhang Xiao-hang LI Yan CHEN Hao YUAN Ying-jin Key Laboratory of Systems Bioengineering Ministry of Education Tianjin Key Laboratory of Biological and Pharmaceutical Engineering Department of Pharmaceutical Engineering School of Chemical Engineering and Technology Tianjin University Tianjin 300072 P.R.China

The chemical composition of Zanthoxylum bungeanum（Z bungeanum） essential oi1（39 batches） was analyzed by gas chromatography-mass spectrometry（GC-MS） analysis（23 ingredients）, and the antitumor activity against HeLa cells was detected via the MTT[3-（4,5-dimethylthiazol-2-yl）-2,5-diphenyltetrazolium bromide] assay. Two composition-activity relationship（CAR） models, generalized regression neural network（GRNN） and support vector regression（SVR） were respectively used to calculate the mean impact value（MIV） so as to identify bioactive com- pounds. Among them 9 ingredients（peaks 4, 15, 7, 8, 13, 3, 16, 9 and 11） were selected due to their high absolute MIVs. All of them have been confirmed with potential antitumor activity by previous researches. The CAR model combined with MIV was expected to be a credible tool for the active compound identification from herbs.

关键词： Zanthoxylum bungeanum essential oil HeLa cell Composition-activity relationship model Active compound identification

Inexact proximal gradient algorithm with random reshuffling for nonsmooth optimization

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Science China(Information Sciences) 2025年第1期68卷 219-237页

作者： Xia jiang Yanyan FANG Xianlin ZENG jian SUN Jie CHEN National Key Lab of Autonomous Intelligent Unmanned Systems School of AutomationBeijing Institute of Technology Beijing Institute of Technology Chongqing Innovation Center School of Electronic and Information Engineering Tongji University

Proximal gradient algorithms are popularly implemented to achieve convex optimization with nonsmooth regularization. Obtaining the exact solution of the proximal operator for nonsmooth regularization is challenging because errors exist in the computation of the gradient; consequently, the design and application of inexact proximal gradient algorithms have attracted considerable attention from researchers. This paper proposes computationally efficient basic and inexact proximal gradient descent algorithms with random reshuffling. The proposed stochastic algorithms take randomly reshuffled data to perform successive gradient descents and implement only one proximal operator after all data pass through. We prove the convergence results of the proposed proximal gradient algorithms under the sampling-without-replacement reshuffling *** computational errors exist in gradients and proximal operations, the proposed inexact proximal gradient algorithms can converge to an optimal solution neighborhood. Finally, we apply the proposed algorithms to compressed sensing and compare their efficiency with some popular algorithms.

关键词： proximal operator random reshuffling inexact computation compressed sensing nonsmooth optimization

Evaluation of a new frequency-volume chart for children with primary monosymptomatic nocturnal enuresis:a prospective,comparative study

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

World Journal of Pediatrics 2021年第6期17卷 643-652页

作者： Jing-Jing Wang Dong-Jie Wang Hai-Dong Fu De-Xuan Wang Qing Yang Xiao-Jie Peng Rui Fu Huan-Dan Yang Rui-Feng zhang Xiao-Wen Wang jiang-Wei Luan Fei Zhao Qiu-Xia Chen Fang-Fang Liang Lu Cao jian-jiang zhang Ying-Jie Li Yang Dong Hui-Mei Huang Ying Bao Xiao-Yu Shen Wei Zhou Guang-Hai Cao Cui-Hua Liu Yan-Yan Jin Mei-Lin Ma Li jiang Qian Shen Hong Xu jian-Hua Mao Department of Nephrology TChildren's Hospital of Zhejiang University School of MedicineNational Clinical Research Center of Child HealthHangzhouChina Department of Nephrology The Second Attiliated Hospital and Yuying Children's Hospital of Wenzhou Medical UniversityWenzhouChina Department of Nephrology Jiangxi Provincial Children's HospitalNanchangChina Department of Nephrology Xuzhou Children's HospitalXuzhou Medical UniversityXuzhouChina Department of Nephrology Wuhan Children's Hospital(Wuhan Maternal and Child Healthcare Hospital)Tongji Medical CollegeHuazhong University of Science and TechnologyWuhanChina Department of Nephrology Children's Hospital of Nanjing Medical UniversityNanjingChina Department of Rheumatology Shenzhen Children's HospitalShenzhenChina Department of Pediatrics The First Affiliated Hospital of Zhengzhou UniversityZhengzhouHenanChina Department of Nephrology Guangzhou Women and Children's Medical CenterGuangzhouChina Department of Nephrology Anhui Provincial Children's HospitalHefeiChina Department of Nephrology The Affiliated Children Hospital of Xi'an Jiaotong UniversityXi'anChina Department of Nephrology Shanghai Children's Medical CenterShanghaiChina Department of Nephrology and Rheumatology Children's Hospital Affiliated to ZhengZhou UniversityHenan Children's HospitalZhengZhou Children's HospitalZhengZhouChina Medical Affairs Department Ferring Pharmaceuticals(Asia)Company LimitedShanghaiChina Marketing Department Ferring Pharmaceuticals(Asia)Company LimitedShanghaiChina Department of Nephrology The Children's Hospital of Fudan UniversityShanghaiChina

Introduction To improve compliance with voiding diaries in children with primary monosymptomatic nocturnal enuresis(PMNE),a new modified 3-day weekend frequency-volume chart(FVC)was designed,and the compliance and validity of this modified FVC was evaluated by comparing with the International Children's Continence Society(ICCS)recommended voiding *** A total of 1200 patients with PMNE were enrolled in the study from 13 centers in China and were randomly assigned to record this modified FVC or the ICCS-recommended voiding *** primary outcome measure was the compliance,assessed by comparing the completing index and the quality score of diaries between two *** secondary outcome measure was the validity,evaluated by comparing the constituent of subtypes,micturition parameters and response rate to *** Among the 1200 participants enrolled in the study,447 patients completed the ICCS-recommended voiding diary and 469 completed the modified *** diurnal completing index and the quality score of the modified FVC group were better than those of the ICCS *** addition,there was no significant difference between these two groups in the subtype classification,or in the response rate to *** The modified FVC could be applied to obtain the voiding characteristics of children with PMNE as the ICCS-recommended voiding diary does and offers a reasonable and better choice for children with PMNE from the unselected population in the future.

关键词： Children Compliance Nocturnal enuresis Voiding diary

Ideal Bi‑Based Hybrid Anode Material for Ultrafast Charging of Sodium‑Ion Batteries at Extremely Low Temperatures

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Nano-Micro Letters 2025年第3期17卷 152-167页

作者： Jie Bai jian Hui Jia Yu Wang Chun Cheng Yang Qing jiang Key Laboratory of Automobile Materials(Jilin University) Ministry of EducationSchool of Materials Science and EngineeringJilin UniversityChangchun 130022People’s Republic of China

Sodium-ion batteries have emerged as competitive substitutes for low-temperature applications due to severe capacity loss and safety concerns of lithium-ion batteries at−20°C or ***,the key capability of ultrafast charging at ultralow temperature for SIBs is rarely ***,a hybrid of Bi nanoparticles embedded in carbon nanorods is demonstrated as an ideal material to address this issue,which is synthesized via a high temperature shock *** a hybrid shows an unprecedented rate performance(237.9 mAh g^(−1)at 2 A g^(−1))at−60℃,outperforming all reported SIB anode *** with a Na_(3)V_(2)(PO_(4))_(3)cathode,the energy density of the full cell can reach to 181.9 Wh kg^(−1)at−40°*** on this work,a novel strategy of high-rate activation is proposed to enhance performances of Bi-based materials in cryogenic conditions by creating new active sites for interfacial reaction under large current.

关键词： Bi nanoparticles High temperature shock High-rate activation Ultrafast charging Low-temperature sodium-ion batteries

Effects of carbon content on the microstructure and tensile properties of a low-density steel

在线全文

学校读者我要写书评

暂无评论

International Journal of Minerals,Metallurgy and Materials 2025年第2期32卷 391-401页

作者： Yongxuan Shang Mingyu Fan Shuyong jiang Zhongwu zhang Key Laboratory of Superlight Materials and Surface Technology Ministry of EducationCollege of Materials Science and Chemical EngineeringHarbin Engineering UniversityHarbin 150001China State Key Laboratory of Metal Material for Marine Equipment and Application Iron&Steel Research Institute of Ansteel Group CorporationAnshan 114009China

Carbon can change the phase components of low-density steels and influence the mechanical *** this study,a new method to control the carbon content and avoid the formation ofδ-ferrite by decarburization treatment was *** microstructural changes and mechanical characteristics with carbon content induced by decarburization were systematically ***-Jaoul(C-J)analysis was employed to examine the work hardening characteristics during the tensile *** decarburization by heat treatments,the carbon content within the austenite phase decreased,while Mn and Al were almost unchanged;this made the steel with full austenite transform into the austenite and ferrite dual ***,(Ti,V)C carbides existed in both matrix phase and the mole fraction almost the *** addition,the formation of other carbides *** loss induced a decrease in strength due to the weakening of the carbon solid *** the steel with the single austinite,the deformation mode of austenite was the dislocation planar glide,resulting in the formation of *** the dual-phase steel,the deformation occurred by the dislocation planar glide of austenite first,with the increase in strain,the cross slip of ferrite took place,forming dislocation cells in *** the late stage of deformation,the work hardening of austinite increased rapidly,while that of ferrite increased slightly.

关键词： low-density steels carbon content decarburization strengthening mechanisms work hardening behavior

Investigating the pharmacological basis and mechanisms of the anti-thrombotic effects of Paeoniae Radix Rubra， both pre- and post-stir-frying with rice wine

在线全文

学校读者我要写书评

暂无评论

Food Science and Human Wellness 2025年

作者： Jiaxu zhang jian Guan Ajiao Hou Wenying Niu Haixue Kuang Liu Yang Hai jiang Key Laboratory of Basic and Application Research of Beiyao， Heilongjiang University of Chinese Medicine， Ministry of Education

Paeoniae Radix Rubra (PRR) is a commonly used traditional Chinese medicine known for promoting blood circulation and alleviating pain. Stir-frying PRR with rice wine enhances its effectiveness in improving blood flow and resolving stasis. To explore the pharmacodynamic basis and mechanisms behind PRR's anti-thrombotic effects—both pre- and post-stir-frying—a comprehensive approach combining pharmacological research， metabolomics， and chemistry was employed. Fraction inter-cross validation experiments， pharmacological assessments， and metabolomic analyses confirm the efficacy of the fraction separation process. Wine-stir-fried PRR (WPRR) shows superior blood activation compared to PRR. PRR mainly affects the TCA cycle and sphingolipid metabolism pathways through its small molecules， enhancing coagulation and fibrinolysis systems' functionality. All the subdivided components of WPRR have anti-thrombotic effects， especially polysaccharides and oligosaccharides. WPRR improves thrombotic conditions in rat blood stasis by modulating arachidonic acid metabolism， TCA cycle， lipid status enhancement， and angiogenesis stimulation while regulating platelet adhesion and aggregation. In conclusion， compared with PRR， the main material basis for the blood-activating efficacy of WPRR has transformed from small molecule compounds to polysaccharide and oligosaccharide components. The action pathways of WPRR in exerting anti-thrombotic efficacy have increased. The polysaccharide components in WPRR might possess considerable potential for being developed into natural anti-thrombotic drugs.

关键词：

Risk factors for renal outcomes in children with antineutrophil cytoplasmic antibody-associated vasculitis:a nationwide retrospective study in China

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

World Journal of Pediatrics 2024年第5期20卷 506-516页

作者： Li-Wen Tan Jun-Li Wan Chun-Hua Zhu Hong Xu Zheng-Kun Xia Li-Zhi Chen Xiao-Chuan Wu Fang Wang Xiao-Rong Liu Cheng-Guang Zhao Xiao-Zhong Li jian-Hua Mao Xiao-Wen Wang Wen-Yan Huang Yu-Hong Li jian-jiang zhang Shi-Pin Feng Jun Yang Jiao-Jiao Liu Chun-Lin Gao Li-Ping Rong Lan-Jun Shuai Ke Xu He-Jia zhang Qiu Li Ai-Hua zhang Mo Wang Department of Nephrology Children’s Hospital of Chongqing Medical UniversityZhongshan 2nd Rd.136Chongqing400014China Ministry of Education Key Laboratory of Child Development and Disorders National Clinical Research Center for Child Health and DisordersChina International Science and Technology Cooperation Base of Child Development and Critical DisordersChildren’s Hospital of Chongqing Medical UniversityChongqingChina Chongqing Key Laboratory of Pediatrics Children’s Hospital of Chongqing Medical UniversityChongqingChina Department of Nephrology Children’s Hospital of Nanjing Medical University72 Guangzhou RoadNanjing210008China Department of Nephrology Children’s Hospital of Fudan UniversityNational Paediatric Medical Center of ChinaShanghaiChina Department of Pediatrics Jinling HospitalNanjing Medical UniversityNanjingChina Department of Pediatrics Jinling HospitalThe First School of Clinical MedicineSouthern Medical UniversityNanjingChina Department of Pediatrics Jinling HospitalMedical School of Nanjing UniversityNanjingChina Department of Pediatric Nephrology and Rheumatology The First Affiliated Hospital of Sun Yat-Sen UniversityGuangzhouChina Department of Pediatrics The Second Xiangya Hospital of Central South UniversityChangshaChina Department of Pediatrics Peking University First HospitalBeijingChina Department of Nephrology Beijing Children’s HospitalCapital Medical UniversityBeijing100045China National Center for Children’s Health BeijingChina Department of Pediatrics Shengjing Hospital of China Medical UniversityShenyangChina Department of Nephrology and Immunology Children’s Hospital of Soochow UniversitySuzhouChina Department of Nephrology Children HospitalZhejiang University School of MedicineHangzhouChina Department of Nephrology Wuhan Children’s Hospital(Wuhan Maternal and Child Healthcare Hospital)Tongji Medical CollegeHuazhong University of Science&TechnologyWuhanChina Department of Nephrology and Rheumatology Shanghai Children’s HospitalSchool

Background Pediatric antineutrophil cytoplasmic antibody-associated vasculitis(AAV)is a life-threatening systemic vasculitis featured by liability to renal ***,there are few studies on the risk factors and predictive models for renal outcomes of AAV in *** Data from 179 AAV children in multiple centers between January 2012 and March 2020 were collected *** risk factors and predictive model of end-stage renal disease(ESRD)in AAV were *** Renal involvement was the most typical manifestation(95.5%),and the crescent was the predominant pathological lesion(84.9%).The estimated glomerular filtration rate(eGFR)was evaluated in 114 patients,of whom 59.6%developed ESRD,and the median time to ESRD was 3.20 *** eGFR[P=0.006,odds ratio(OR)=0.955,95%confidence interval(CI)=0.924–0.987]and the percentages of global glomerulosclerosis(pGGS;P=0.018,OR=1.060,95%CI=1.010–1.112)were independent risk factors for ESRD of renal *** on the pGGS and eGFR at renal biopsy,we developed three risk grades of ESRD and one predictive *** Kaplan‒Meier curve indicated that renal outcomes were significantly different in different risk grades(P<0.001).Compared with serum creatinine at baseline,the predictive model had higher accuracy(0.86 versus 0.58,P<0.001)and a lower coefficient of variation(0.07 versus 0.92)in external *** Renal involvement is the most common manifestation of pediatric AAV in China,of which more than half deteriorates into *** predictive model based on eGFR at renal biopsy and the pGGS may be stable and accurate in speculating the risk of ESRD in AAV children.

关键词： Antineutrophil cytoplasmic antibody End-stage renal disease Glomerulonephritis Pediatric nephrology Vasculitis