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81篇 您的检索式:作者名="LENG Song"
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1Ulinastatin for acute lung injury and acute respiratory distress syndrome: A systematic review and meta-analysis显示文摘AIM: To investigate the efficacy and safety of ulinastatin for patients with acute lung injury(ALI) and those with acute respiratory distress syndrome(ARDS).METHODS: A systematic review of randomized controlled trials(RCTs) of ulinastatin for ALI/ARDS was conducted. Oxygenation index, mortality rate [intensive care unit(ICU) mortality rate, 28-d mortality rate] and length of ICU stay were compared between ulinastatin group and conventional therapy group. Meta-analysis was performed by using Rev Man 5.1.RESULTS: Twenty-nine RCTs with 1726 participants were totally included, the basic conditions of which were similar. No studies discussed adverse effect. Oxygenation index was reported in twenty-six studies(1552 patients). Ulinastatin had a significant effect in improving oxygenation [standard mean difference(SMD) = 1.85, 95%CI: 1.42-2.29, P < 0.00001, I2 = 92%]. ICUmortality and 28-d mortality were respectively reported in eighteen studies(987 patients) and three studies(196 patients). We found that ulinastatin significantly decreased the ICU mortality [I2 = 0%, RR = 0.48, 95%CI: 0.38-0.59, number needed to treat(NNT) = 5.06, P < 0.00001], while the 28-d mortality was not significantly affected(I2 = 0%, RR = 0.78, 95%CI: 0.51-1.19, NNT = 12.66, P = 0.24). The length of ICU stay(six studies, 364 patients) in the ulinastatin group was significantly lower than that in the control group(SMD =-0.97, 95%CI:-1.20--0.75, P < 0.00001, I2 = 86%). CONCLUSION: Ulinastatin seems to be effective for ALI and ARDS though most trials included were of poor quality and no information on safety was provided.Yu-Xin Leng Shu-Guang Yang Ya-Han Song Xi Zhu Gai-Qi Yao 2014World Journal of Critical Care Medicine2014,3,1:61
2Risk factors for intracranial aneurysm in a Chinese ethnic population显示文摘背景 Intracranial 动脉瘤( IAN )在一根大脑动脉上是一个耸出的水泡或囊汽球外面随着时间的过去,它可以导致自发的 subarachnoid 出血( SAH ),最终,残疾和 mortality.Current 研究显示疾病由于多重原因,包括环境因素和血容器的各种各样的先天的畸形。除了先天的倾向,象性别,年龄,高血压,和动脉粥样硬化那样的各种各样的高风险的因素涉及 intracranial 动脉瘤的形成。这研究的目的是调查在中国汉种族 patients.Methods 与分散的 intracranial 动脉瘤的形成联系的风险因素有 intracranial 动脉瘤的 251 个病人和有另外的服的疾病(控制组) 的 338 个病人的一个总数在这研究被注册。单个因素和逻辑回归模型被用来与年龄分析 intracranial 动脉瘤的协会;性别;香烟吸烟;酒精或可卡因消费;高血压,冠的动脉疾病,糖尿病 mellitus 和继承结缔组织疾病的历史;并且 fasting 血的层次葡萄糖和血脂肪。数据表示了同样吝啬的敤摡攠摮吗?GU Yu-xiang CHEN Xian-cheng SONG Dong-lei LENG Bing ZHAO Fan 2006Chinese Medical Journal2006,,16:28
3The Petty Projection Inequality for L_p-Mixed Projection Bodies显示文摘最近, Lutwak,杨和张提出了 L_p 设计身体的观点并且建立细小的设计不平等 L_p 模拟。在这篇论文,混合 L_p 的设计身体的观点被介绍—L_p 设计身体是一种特殊情况。细小的设计不平等,以及 Lutwak “ s quermassintegrals (混合 L_p 的 quermassintegrals ) 细小的设计不平等的扩展,为混合 L_p 的设计被建立身体。Wei Dong WANG Gang Song LENG 2007Acta Mathematica Sinica,English Series2007,23,8:12
4Epidemiological Features of Nontraumatic Spontaneous Subarachnoid Hemorrhage in China: A Nationwide Hospital-based Multicenter Study显示文摘JJan-Ping Song Wei Ni Yu-Xiang Gu Wei Zhu Liang Chen Bin Xu Bin Leng Yan-Long Tian Ying Mao 2017Chinese Medical Journal2017,,7:12
5Water regime-nitrogen fertilizer incorporation interaction:Field study on methane and nitrous oxide emissions from a rice agroecosystem in Harbin, China显示文摘Water regime and nitrogen(N) fertilizer are two important factors impacting greenhouse gases(GHG) emission from paddy field, whereas their effects have not been well studied in cold region. In this study, we conducted a two-year field experiment to study the impacts of water regime and N fertilizer on rice yields and GHG emissions in Harbin, China, a cold region located in high latitudes. Our results showed that intermittent irrigation significantly decreased methane(CH_4) emission compared with continuous flooding, however,the decrement was far lower than the global average level. The N_2O emissions were very small when flooded but peaked at the beginning of the disappearance of floodwater. The N fertilizer treatments increased CH_4 emissions at low level(75 kg N/ha). But both CH_4 and N_2O emissions were uninfluenced at the levels of 150 kg N/ha and 225 kg N/ha. Rice yields increased under intermittent irrigation and were highest at the level of 150 kg N/ha. From our results, we recommended that the intermittent irrigation and 150 kg N/ha as the ideal water regime-nitrogen fertilizer incorporation for this area to achieve low GHG emissions without impacting rice yields.Wenjun Dong Jia Guo Lijun Xu Zhifeng Song Jun Zhang Ao Tang Xijuan Zhang Chunxu Leng Youhong Liu Lianmin Wang Lizhi Wang Yang Yu Zhongliang Yang Yilei Yu Ying Meng Yongcai Lai 2018Journal of Environmental Sciences2018,30,2:12
6Raman characteristics of hydrocarbon and hydrocarbon inclusions显示文摘The Raman spectrograms of hydrocarbon standard samples show that: (1) the Raman spectrogram of normal paraffin has very strong peaks of methyl and methylene (from 2700 cm-1 to 2970 cm-1); (2) branch methyl has the particular peak of 748 cm-1±; (3) six cyclic has the particular peak of 804 cm-1±; (4) phenyl has two particular peaks of 988 cm-1± and 3058 cm-1± and the 988 cm-1± peak is stronger than the 3058 cm-1± peak; and (5) hexene has three alkenyl spectrum peaks of 1294 cm-1±, 1635 cm-1± and 2996 cm-1±, with the 1635 cm-1± peak being the strongest, showing that the number of carbon in hy-drocarbon does not affect its Raman spectrogram, and the hydrocarbon molecular structure and base groups affect its Raman spectrogram, the same hydrocarbons (such as normal paraffin) have the same Raman spectrogram; the types (such as CH4, C2H6, C3H8) and the content of hydrocarbon in oil inclu-sions are not estimated by their characteristic Raman peaks. According to the Raman spectrograms of hydrocarbon compositions, the Raman spectrogram of hydrocarbon inclusion can be divided into five types: saturated hydrocarbon Raman spectrogram, fluoresce Raman spectrogram, saturated hydro-carbon bitumen Raman spectrogram, bitumen Raman spectrogram, and ethane Raman spectrogram. And according to the characteristics of Raman spectrogram, hydrocarbon inclusions can be divided into five types: saturated hydrocarbon inclusion, less saturated hydrocarbon (oil or gas) inclusion, saturated hydrocarbon bitumen inclusion, bitumen inclusion, and methane water inclusion.ZHANG Nai TIAN ZuoJi LENG YingYing WANG HuiTong SONG FuQing MENG JianHua 2007Science China Earth Sciences2007,50,8:7
7The effects of air temperature and precipitation on the net primary productivity in China during the early 21st century显示文摘Research on how terrestrial ecosystems respond to climate change can reveal the complex interactions between vegetation and climate,net primary productivity (NPP),an important vegetation parameter and ecological indicator,fluctuates within any given ecological environment or regional carbon budget.In this study, spatial interpolation was used to generate a spatial dataset, with 1-km spatial resolution,with meteorological data from 736 observation stations across China.An improved CASA model was used to simulate NPP over the period of 2001-2013 by taking into account land-cover change in every year during the same period.We propose the grid- based spatial patterns and dynamics of annual NPP,annual average temperature,and annual total precipitation based on the model.We also used the model to demonstrate the spatial correlation between NPP,temperature,and pre- cipitation in the study area with special focus on the impact of climate change in the early 21st century.Results showed that the spatial pattern of NPP over all of China is characterized by higher values in the southeast and lower values in the northwest.The spatial pattern of temperature indicates substantial latitudinal differences across the country,and the spatial pattem of precipitation shows a ribbon of decline from the southeast coast to the northwest inland.Most areas show an upward trend in NPP. Temperatures appear to decrease across the country during the global warming hiatus (1998-2008),and are accom- panied by an increase in precipitation over most regions.The correlation between NPP and annual average temperature is weak.Alternatively,NPP and annual total precipitation are positively correlated in northern and central China at a coefficient above 0.64(p <0.01)yet negatively correlated in the eastem parts of the Qinghai- Tibet Plateau and Sichuan Basin.Results can provide useful information for improving parameters for calibra- tion of the terrestrial ecosystem process model.Qianfeng WANG Jingyu ZENG Song LENG Bingxiong FAN Jia TANG Cong JIANGs Yi HUANG Qing ZHANG Yanping QU Wnlin WANG Wei SHUI 2018Frontiers of Earth Science2018,12,4:6
8The potential of Clostridium autoethanogenum,a new single cell protein,in substituting fish meal in the diet of largemouth bass(Micropterus salmoides):Growth,feed utilization and intestinal histology显示文摘This study investigated the effects of replacing fishmeal with Clostridium autoethanogenum protein(CAP)on growth,feed utilization and intestinal histology of largemouth bass(Micropterus salmoides).The control diet contained 350 g/kg fishmeal,and then dietary fishmeal was decreased to 300 g/kg,250 g/kg,200 g/kg,150 g/kg and 100 g/kg by CAP inclusion,respectively(FM-30,FM-25,FM-20,FM-15,FM-10).The largemouth bass(110.0±1.0 g)were fed one of the six diets for 8 weeks.The groups of FM-30,FM-25 and FM-20 showed the similar weight gain(WG)and feed conversion ratio(FCR)to the control(P>0.05),while the WG of FM-10 group was decreased by 15.9%,and FCR increased by 0.12 when compared to the control(P<0.05).FM-15 and FM-10 groups had lower protein retention,lower villus height in intestine and higher serum malondialdehyde content than the control(P<0.05).The protease activity in FM-20,FM-15 and FM-10 groups was lower than that in the control(P<0.05),but no difference was observed in crude protein digestibility among groups(P>0.05).In conclusion,CAP could replace 150 g/kg fishmeal in diet(350 g/kg fishmeal)without adverse effects on growth,feed utilization and intestinal histology of largemouth bass.Pinxian Yang Xiaoqin Li Bowen Song Ming He Chaoyi Wu Xiangjun Leng 2023Aquaculture and Fisheries2023,8,1:6
9Effect of ligand of peroxisome proliferator-activated receptor γ on the biological characters of hepatic stellate cells显示文摘AIM: To study the effect of rosiglitazone, which is a ligand of peroxisome proliferator-activated receptor gamma (PPARγ), on the expression of PPARγ in hepatic stellate cells (HSCs) and on the biological characteristics of HSCs.METHODS: The activated HSCs were divided into three groups: control group, 3 μmol/L rosiglitazone group, and 10 μmol/L rosiglitazone group. The expression of PPARγ,α-smooth muscle actin (α-SMA), and type Ⅰ and Ⅲ collagen was detected by RT-PCR, Western blot and immunocytochemical staining, respectively. Cell proliferation was determined with methylthiazolyltetrazolium (MTT) colorimetric assay. Cell apoptosis was demonstrated with flow cytometry.RESULTS: The expression of PPARγ at mRNA and protein level markedly increased in HSCs of 10 μmol/L rosiglitazone group (tvalue was 10.870 and 4.627 respectively, P<0.01in both). The proliferation of HSCs in 10 μmol/L rosiglitazone group decreased significantly (t = 5.542, P<0.01), α-SMA expression level and type Ⅰ collagen synthesis ability were also reduced vs controls (tvalue= 10.256 and 14.627respectively, P<0.01 in both). The apoptotic rate of HSCs significantly increased in 10 μmol/L rosiglitazone group vs control (x2= 16.682, P<0.01).CONCLUSION: By increasing expression of PPARγ in activated HSCs, rosiglitazone, an agonist of PPARγ,decreases α-SMA expression and type Ⅰ collagen synthesis,inhibits cell proliferation, and induces cell apoptosis.Yan-Tong Guo Xi-Sheng Leng Tao Li Ji-Run Peng Sheng-Han Song Liang-Fa Xiong Zhi-Zhong Qin 2005World Journal of Gastroenterology2005,11,30:5
10Enhancement of transfection efficiency for HeLa cells via incorporating arginine moiety into chitosan显示文摘Arginine-rich peptides have attracted considerable attention due to their distinct internalization mechanism. It was reported that arginine and guanidino moieties were able to translocate through cell membranes and played a critical role in the process of membrane permeation. In this work, arginine was conjugated to the backbone of chitosan to form a novel chitosan derivative, arginine modified chitosan (Arg-CS). Arg-CS/DNA complexes were prepared according to the method of coacervation process. The physicochemical properties of Arg-CS and Arg-CS/DNA complexes were characterized and the transfection activity and efficiency mediated by Arg-CS/DNA complexes were investigated taking HeLa cells as target cells. Arg-CS was characterized by FTIR and 13C NMR. Arg-CS/DNA polye- lectrolyte complexes were investigated by agarose gel retardation, dynamic light scattering (DLS) and atomic force microscopy (AFM). The results revealed that the Arg-CS/DNA complexes started to form at N/P ratio of 2:1, and the size of particles varied from 100 to 180 nm. The cytotoxicity of Arg-CS and their complexes with plasmid DNA were determined by MTT assay for HeLa cells, and the results suggested that Arg-CS/DNA complexes were slightly less toxic than Arg-CS. Moreover, the derivative alone and their complexes showed significantly lower toxicity than PEI and PEI/DNA complexes, respectively. Taking HeLa cells as target cells and using pGL3-control as reporter gene, the luciferase expression mediated by Arg-CS was greatly enhanced to about 100 folds compared with the luciferase expression mediated by chitosan at different pH media. These results suggest that Arg-CS is a promising candi- date as a safe and efficient vector for gene delivery and transfection.ZHU DunWan ZHANG HaiLing BAI JinGen LIU WenGuang LENG XiGang SONG CunXian YANG Jian LI XiaoWei JIN Xu SONG LiPing LIU LanXia LI XiuLan ZHANG Yang YAO KangDe 2007Chinese Science Bulletin2007,52,23:4
11Pump scheme optimization of an incoherently pumped high-power random fiber laser显示文摘Optical signal-to-noise ratio(OSNR) is one of the most significant parameters for the performance characterization of random fiber lasers(RFLs) and their application potentiality in sensing and telecommunication. An effective way to improve the OSNR of RFLs is pump scheme optimization, for example, employing a temporally stable source as the pump. In this paper, the output performance of an incoherently pumped RFL dependence on the pump bandwidth has been investigated both in experiment and theory. It is found that a high-OSNR RFL can be achieved with broadband amplified spontaneous emission(ASE) source pumping, and a relatively broad pump bandwidth can also help suppress the spectral broadening while maintaining an ultra-high spectral purity.By optimizing the pump bandwidth to ~10 nm, maximum OSNR of ~39 dB(corresponding to a spectral purity of ~99.96%) with more than 99 W output power can be obtained. Moreover, for the pump bandwidth of 0.6–40 nm, the spectral purity can reach as high as >99% with the pump power ranging from ~85 to ~117 W.In addition, with the aid of theoretical simulation based on a modified power balance model, we find that the increment of pump bandwidth can decrease the effective Raman gain coefficient, further influencing the gain characteristics, nonlinear effects, and eventually the output performance. This work provides new insight into the influence of the pump characteristics on the output performance of incoherently pumped RFLs.JUN YE JIANGMING XU JIAXIN SONG ANG ZHANG HANWEI ZHANG HU XIAO JINYONG LENG PU ZHOU 2019Photonics Research2019,7,9:4
12Optical rogue wave in random fiber laser显示文摘The famous demonstration of optical rogue waves(RWs),a powerful tool to reveal the fundamental physics in different laser scenarios,opened a flourishing time for temporal statistics.Random fiber laser(RFL)has likewise attracted wide attention due to its great potential in multidisciplinary demonstrations and promising applications.However,owing to the distinctive cavity-free structure,it is a scientific challenge to achieve temporal localized RWs in RFLs,whose feedback arises from multiple scattering in disordered medium.Here,we report the exploration of RW in the highly skewed,transient intensity of an incoherently pumped RFL for the first time,to our knowledge,and unfold the involved kinetics successfully.The corresponding frequency domain measurements demonstrate that the RW event arises from a crucial sustained stimulated Brillouin scattering process with intrinsic stochastic nature.This investigation highlights a novel path to fully understanding the complex physics,such as photon propagation and localization,in disordered media.JIANGMING XU JIAN WU JUN YE JIAXIN SONG BAICHENG YAO HANWEI ZHANG JINYONG LENG WEILI ZHANG PU ZHOU YUNJIANG RAO 2020Photonics Research2020,8,1:4
13Spatial-temporal evolution of vegetation evapotranspiration in Hebei Province,China显示文摘Evapotranspiration(ET)is the sum of soil or water body evaporation and plant transpiration from the earth surface and ocean to the atmosphere,and thus plays a significant role in regulating carbon and water resource cycles.The time-series data set from the remote sensing MOIDS product(MOD16)was used to study the spatial-temporal evolution of vegetation evapotranspiration in salinized areas during 2000–2014 by analyzing the variability,spatial patterns and Mann-Kendall(MK)nonparametric trends for the time series.The results indicate that inter-annual and intra-annual variations of ET across various vegetated areas show seasonal changes,with the abnormal months identified.The cultivated land displays a greater degree of spatial heterogeneity and the spatial pattern of ET in the area covered by broadleaved deciduous forests corresponds to a higher ET rate and increased water consumption.A widespread decline of ET is observed only in cultivated areas.However,agricultural cultivation doesn’t worsen water shortage and soil salinization problems in the region,and water shortage problems are worsening for other vegetated areas.This research provides a basis of reference for the reasonable allocation of water resources and restructuring of vegetation patterns in salinized areas.WANG Qian-feng TANG Jia ZENG Jing-yu QU Yan-ping ZHANG Qing SHUI Wei WANG Wu-lin YI Lin LENG Song 2018Journal of Integrative Agriculture2018,17,9:4
14Osteoporosis affects both post-yield microdamage accumulation and plasticity degradation in vertebra of ovariectomized rats显示文摘Estrogen withdrawal in postmenopausal women increases bone loss and bone fragility in the vertebra. Bone loss with osteoporosis not only reduces bone mineral density(BMD), but actually alters bone quality, which can be comprehensively represented by bone post-yield behaviors. This study aimed to provide some information as to how osteoporosis induced by estrogen depletion could influence the evolution of post-yield microdamage accumulation and plastic deformation in vertebral bodies. This study also tried to reveal the part of the mechanisms of how estrogen deficiency-induced osteoporosis would increase the bone fracture risk. A rat bilateral ovariectomy(OVX)model was used to induce osteoporosis. Progressive cyclic compression loading was developed for vertebra testing to elucidate the post-yield behaviors. BMD, bone volume fraction, stiffness degradation, and plastic deformation evolution were compared among rats raised for 5 weeks(ovx5w and sham5 w groups) and 35 weeks(ovx35w and sham35 w groups) after sham surgery and OVX. The results showedthat a higher bone loss in vertebral bodies corresponded to lower stiffness and higher plastic deformation. Thus, osteoporosis could increase the vertebral fracture risk probably through microdamage accumulation and plastic deforming degradation.Siwei Li Guodong Niu Neil X. Dong Xiaodu Wang Zhongjun Liu Chunli Song Huijie Leng 2017Acta Mechanica Sinica2017,33,2:3
15Synthesis of N-methylene phosphonic chitosan(NMPCS)and its potential as gene carder显示文摘N-Methylene phosphoulc chitosan (NMPCS),an amphiphilic macromolecule with powerful chelating ability of Ca^(2+) ions,was synthesized and characterized.The physicochemical properties of NMPCS and the interactions between NMPCS and plasmid DNA were investigated by FTIR,^(13)C NMR,X-ray,agarose gel electrophorcsis retardation assay,atomic force microscopy (AFM) and circular dichroism (CD).The results suggest that at charge ratio 2:1 or above,DNA could be completely entrapped and spherical complexes with mean size of 80-210 nm were formed.Taking HeLa as host cell,luciferase expression mediated by NMPCS improved about 100 times compared to the expression mediated by chitosan.Dun Wan Zhu Jin Gen Bo Hai Ling Zhang Wen Guang Liu Xi Gang Leng Cun Xian Song Yu Ji Yin Li Ping Song Lan Xia Liu Lin Mei Xiu Lan Li Yang Zhang Kang De Yao 2007Chinese Chemical Letters2007,18,11:3
16Hierarchical Micropore/Nanorod Apatite Hybrids In-Situ Grown from 3-D Printed Macroporous Ti6Al4V Implants with Improved Bioactivity and Osseointegration显示文摘The advent of three-dimensional(3-D) printed technique provides great possibility in the fabrication of customized porous titanium(Ti) implant. However, the bioinert property of the printed Ti poses an outstanding problem. Hybrid micro-arc oxidation and hydrothermal(MAO–HT) treatment on porous metals is able to produce multi-scaled hierarchical orthopedic implant, showing great potential for surface modification of 3-D printed implant. In this study, cylindrical porous Ti6Al4V(Ti64) scaffolds with pore size of 640 μm, porosity of 73% were 3-D printed by electron beam melting process, and their surfaces were left untreated or treated by a combined MAO–HT procedure. In vitro bioactivity was tested by immersion in simulated body fluid for different time points. Then, 12 scaffolds in each group were implanted into the femoral condyles of New Zealand rabbit for 8 weeks. Osseointegration was evaluated by qualitative and quantitative histological analysis, and the bone ingrowth features were probed by sequential fluorescent labeling at 3 and 6 weeks post-surgery. Following the MAO–HT treatment, the porous Ti64 scaffold was endowed with multi-scaled micro/nano-topographies and high amounts of Ca P on its surface.The treated scaffold exhibited drastically enhanced apatite forming ability compared with the untreated one. In vivo test revealed significantly that a higher amount of bone ingrowth and bone implant contact at the treated scaffold. The 2 types of scaffolds had different patterns of bone ingrowth: the treated scaffold exhibited a pattern of contact osteogenesis, by which bone formed directly on the treated implant surface, whereas bone formed distal to the implant surface of the untreated scaffold. MAO–HT treatment can significantly enhance the in vitro apatite-inducing ability and in vivo osseointegration capacity of 3-D porous Ti64 scaffold and may provide as a viable approach for the fabrication of bioactive 3-D printed porous implant for orthopedic applications.Peng Xiu Zhaojun Jia Jia Lv Chuan Yin Hong Cai Chunli Song Huijie Leng Yufeng Zheng Zhongjun Liu Yan Cheng 2017Journal of Materials Science & Technology2017,33,2:2
17Chebyshev polynomial approximation for dynamical response problem of random system显示文摘T. Fang X.L. Leng C.Q. Song 2003Journal of Sound and Vibration2003,,1:2
183D Carbon Frameworks for Ultrafast Charge/Discharge Rate Supercapacitors with High Energy‑Power Density显示文摘Carbon-based electric double layer capacitors(EDLCs)hold tremendous potentials due to their high-power performance and excellent cycle stability.However,the practical use of EDLCs is limited by the low energy density in aqueous electrolyte and sluggish diffusion kinetics in organic or/and ionic liquids electrolyte.Herein,3D carbon frameworks(3DCFs)constructed by interconnected nanocages(10-20 nm)with an ultrathin wall of ca.2 nm have been fabricated,which possess high specific surface area,hierarchical porosity and good conductive network.After deoxidization,the deoxidized 3DCF(3DCFDO)exhibits a record low IR drop of 0.064 V at 100 A g^−1 and ultrafast charge/discharge rate up to 10 V s^−1.The related device can be charged up to 77.4%of its maximum capacitance in 0.65 s at 100 A g^−1 in 6 M KOH.It has been found that the 3DCF-DO has a great affinity to EMIMBF4,resulting in a high specific capacitance of 174 F g^−1 at 1 A g^−1,and a high energy density of 34 Wh kg^−1 at an ultrahigh power density of 150 kW kg^−1 at 4 V after a fast charge in 1.11 s.This work provides a facile fabrication of novel 3D carbon frameworks for supercapacitors with ultrafast charge/discharge rate and high energy-power density.Changyu Leng Zongbin Zhao Yinzhou Song Lulu Sun Zhuangjun Fan Yongzhen Yang Xuguang Liu Xuzhen Wang Jieshan Qiu 2021Nano-Micro Letters2021,13,1:2
19Study and Implementation of a New SQL-Based ETL Approach显示文摘This paper analyzes the main characteristics,benefits,and disadvantages of existing traditional ETL(extraction,trans-formation,loading) methods,and summaries some factors affect-ing the performance of ETL tools. Then,a new ETL approach,E-LT(extraction,loading and transformation) ,is proposed. The E-LT approach applies database mapping technique to realize that loading stage and transformation stage in the ETL process are performed at the same time after the extraction stage. Thus,it can use SQL commands to complete loading and transformation proc-essing,and eliminates the staging area before loading in traditional ETL process. The framework of an ETL engine based on E-LT method is presented. The ETL process including initial loading and incremental refreshment is discussed in detail,and the SQL-based algorithm for initial loading is presented. The per-formance of E-LT method on loading throughout outperforms some commercial ETL approaches by experimental proof and theoretical analysis. At last,a real case in marine data warehousing of the E-LT method is discussed for illustrating the validity of the proposed method.BAO Yubin SONG Jie LENG Fangling WANG Daling YU Ge 2007Wuhan University Journal of Natural Sciences2007,12,5:2
20Quasi L_p-Intersection Bodies显示文摘这篇论文的目的是概括交叉身体的观点到伪 L_p 交叉身体的。为伪 L_p 交叉身体的 Busemann 交叉不平等和 Brunn Minkowski 不平等的 L_p 类似物被获得。为混合的伪 L_p 交叉身体的 Aleksandrov-Fenehel 不平等也被建立。Wu Yang YU Dong Hua WU Gang Song LENG 2007Acta Mathematica Sinica,English Series2007,23,11:2
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