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  1. Article ; Online: Approaching Sustainable Bike-Sharing Development

    Lidong Zhu / Mujahid Ali / Elżbieta Macioszek / Mahdi Aghaabbasi / Amin Jan

    Sustainability, Vol 14, Iss 5795, p

    A Systematic Review of the Influence of Built Environment Features on Bike-Sharing Ridership

    2022  Volume 5795

    Abstract: Bike-sharing is known as a sustainable form of transportation. This travel mode is able to tackle the “last mile” transit issue and deliver financial, well-being, and low-carbon lifestyle advantages to users. To date, many studies have analysed the ... ...

    Abstract Bike-sharing is known as a sustainable form of transportation. This travel mode is able to tackle the “last mile” transit issue and deliver financial, well-being, and low-carbon lifestyle advantages to users. To date, many studies have analysed the influence of various factors, including built environments, on bike-sharing ridership. However, no study has exclusively synthesised these findings regarding the association between built-environment attributes and bike-sharing ridership. Thus, in this study, a systematic literature review was conducted on 39 eligible studies. These studies were assessed with respect to (1) bike-sharing usage, (2) studies’ geographical distribution, (3) data collection and analysis method, and (4) built environment factor type. Most studies were carried out in the US and Chinese cities. Variables associated with diversity, density, and distance to public transport stations and public transport infrastructure were frequently employed by the studies reviewed. It was found that BS stations with an average capacity of 24.63 docks and street network systems with an average length of 12.57 km of cycling lanes had a significant impact on the bike-sharing ridership. The findings of these studies were combined, and a series of recommendations were proposed based on them for bike-sharing service providers and researchers in academia. The findings of this evaluation can help practitioners and scholars understand the important built environment elements that influence bike-sharing ridership. Knowledge in this field will enable bike-sharing service providers to direct their resources sufficiently to enhance the more essential aspects of bike-sharing users’ satisfaction.
    Keywords bike-sharing ridership ; station flow ; docked bike sharing ; dockless bike sharing ; diversity ; built environment attributes ; Environmental effects of industries and plants ; TD194-195 ; Renewable energy sources ; TJ807-830 ; Environmental sciences ; GE1-350
    Subject code 306
    Language English
    Publishing date 2022-05-01T00:00:00Z
    Publisher MDPI AG
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  2. Article ; Online: A Charrelation Matrix-Based Blind Adaptive Detector for DS-CDMA Systems

    Zhongqiang Luo / Lidong Zhu

    Sensors, Vol 15, Iss 8, Pp 20152-

    2015  Volume 20168

    Abstract: In this paper, a blind adaptive detector is proposed for blind separation of user signals and blind estimation of spreading sequences in DS-CDMA systems. The blind separation scheme exploits a charrelation matrix for simple computation and effective ... ...

    Abstract In this paper, a blind adaptive detector is proposed for blind separation of user signals and blind estimation of spreading sequences in DS-CDMA systems. The blind separation scheme exploits a charrelation matrix for simple computation and effective extraction of information from observation signal samples. The system model of DS-CDMA signals is modeled as a blind separation framework. The unknown user information and spreading sequence of DS-CDMA systems can be estimated only from the sampled observation signals. Theoretical analysis and simulation results show that the improved performance of the proposed algorithm in comparison with the existing conventional algorithms used in DS-CDMA systems. Especially, the proposed scheme is suitable for when the number of observation samples is less and the signal to noise ratio (SNR) is low.
    Keywords blind source separation ; DS-CDMA ; charrelation matrix ; joint diagonalization ; Technology (General) ; T1-995 ; Technology ; T ; Analytical chemistry ; QD71-142 ; Chemistry ; QD1-999 ; Science ; Q
    Subject code 003
    Language English
    Publishing date 2015-08-01T00:00:00Z
    Publisher MDPI AG
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  3. Article: New insights into the magnetic characteristics of high mountain loess in Central Asia and its paleoclimatic implications

    Jia, Jia / Bo Wang / Caichen Lu / Dunsheng Xia / Lidong Zhu / Youjun Wang

    Quaternary international. 2019 Jan. 26, v. 502

    2019  

    Abstract: The previous studies applied “wind intensity” model to explain the corresponding variations of magnetic susceptibility and particle size curves in Tienshan Mountain loess. Most of these studies focused on low altitude loess, due to their high deposit ... ...

    Abstract The previous studies applied “wind intensity” model to explain the corresponding variations of magnetic susceptibility and particle size curves in Tienshan Mountain loess. Most of these studies focused on low altitude loess, due to their high deposit rate, and ignored the high-altitude loess. In this study, we investigated characteristics of lithological and pedogenic magnetic particles to systemically understand their paleoclimatic implications. The result suggested high mountain loess in Tienshan region exhibits that, not only lithologic magnetic particles, but also pedogenic present the variable contents. The magnetic susceptibility has a complex implication. In contrast, the fine-grained magnetite exhibits a close link with pedogenesis. Therefore, the relative parameters can be used to recover moisture variation. The evidences from particle size and their dependence of magnetic susceptibility suggested particle-size effect on lithological magnetic susceptibility is weak. The “wind intensity” model can be an important factor for variations of lithologic magnetic susceptibility of Tienshan Mountain loess rather than a dominant factor. It still needs more study to determine the implication of magnetic susceptibility of lithologic materials.
    Keywords altitude ; loess ; magnetism ; magnetite ; models ; particle size ; soil formation ; Central Asia
    Language English
    Dates of publication 2019-0126
    Size p. 71-77.
    Publishing place Elsevier Ltd
    Document type Article
    ISSN 1040-6182
    DOI 10.1016/j.quaint.2019.01.031
    Database NAL-Catalogue (AGRICOLA)

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  4. Article: Early middle Holocene climate oscillations recorded in the Beihuqiao Core, Yuhang, Zhejiang Province, China

    Ye, Wei / Qu Chen / Lidong Zhu / Fengquan Li / Tianyang Wang / Longjuan Cheng / Yunxia Zhang

    Journal of paleolimnology. 2018 Feb., v. 59, no. 2

    2018  

    Abstract: A long-standing controversy exists concerning the spatial and temporal characteristics of Holocene climate change in China. Zhejiang is located in the southeast of China, where the East Asian monsoon dominates the climate and a Neolithic culture ... ...

    Abstract A long-standing controversy exists concerning the spatial and temporal characteristics of Holocene climate change in China. Zhejiang is located in the southeast of China, where the East Asian monsoon dominates the climate and a Neolithic culture flourished. In recent years, geographers have debated the climatic conditions existing at the time of the Neolithic cultures. This study reconstructed the sedimentary environment between 11.30 and 4.17 cal ka BP based on a multi-proxy analysis of a 14.3 meter sediment core, drilled in Beihuqiao, Zhejiang Province, China. The results show: (1) The climate was getting warm between 11.50 and 8.77 cal ka BP. Grain size became finer from the bottom to the top layer, accompanied by an increase in the chemical index of alteration (CIA), Mg/Sr ratio, the percentage of clay, pollen concentrations, and a decrease in SiO₂/Al₂O₃ ratio, and the value of bases–alumina (ba), as well as other trace elements. (2) Between 8.77 and 7.99 cal ka BP, the sediment is composed of gray-yellow and gray silt. The percentage of CaO and the ratio of CaO + Na₂O + K₂O to Al₂O₃ is much higher. The pollen concentration sharply decreases. The climate was cold and dry in the early stages of this period, but became relatively warmer and wetter in the later stages. (3) The Holocene Climatic Optimum occurred at 7.99–5.68 cal ka BP. Higher contents of clay, total Fe₂O₃, Al₂O₃, CIA, the chemical proxy of alteration, pollen concentration, evergreen pollens, and high values of Mg/Sr are observed at this stage, coinciding with a lower SiO₂/Al₂O₃ value, (CaO + Na₂O + K₂O)/Al₂O₃ ratio, and an obvious reduction in silt/clay, and SiO₂ and CaO concentrations. (4) During the period 5.68–4.17 cal ka BP, the temperature in the study area declined in a stepwise fashion. The grain size became finer, and the Mg/Sr ratio decreased gradually.
    Keywords aluminum oxide ; calcium oxide ; clay ; climate change ; climatic factors ; ferric oxide ; limnology ; magnesium ; monsoon season ; paleontology ; pollen ; silica ; silt ; strontium ; temperature ; China
    Language English
    Dates of publication 2018-02
    Size p. 263-278.
    Publishing place Springer Netherlands
    Document type Article
    ZDB-ID 1478181-5
    ISSN 1573-0417 ; 0921-2728
    ISSN (online) 1573-0417
    ISSN 0921-2728
    DOI 10.1007/s10933-017-9959-x
    Database NAL-Catalogue (AGRICOLA)

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  5. Article: Human activity induced asynchronous dune mobilization in the deserts of NE China during the late Holocene

    Guo, Licheng / Jiabin Wu / Lidong Zhu / Shangfa Xiong / Wei Ye / Yulu Chen / Zhongli Ding

    Aeolian research. 2018 Oct., v. 34

    2018  

    Abstract: Studies of dune mobilization during the last 3 kyr in the deserts of NE China indicate that the area of desert expanded, and associated dust storms increased in the affected regions downwind. However, uncertainty about the timing and origin of episodes ... ...

    Abstract Studies of dune mobilization during the last 3 kyr in the deserts of NE China indicate that the area of desert expanded, and associated dust storms increased in the affected regions downwind. However, uncertainty about the timing and origin of episodes of late Holocene dune mobilization has resulted in the failure to provide information about dust-related processes that can be used in atmospheric dust models. Here, we present a detailed regional compilation of dune mobilization and human activity in the deserts of NE China and the adjacent regions spanning the last 3 kyr. The results show that human activity and dune mobilization intensified synchronously at ∼2.5 ka in the Mu Us and Hobq deserts, at ∼1.5 ka in the deserts of NE China, and at ∼0.5 ka in the Horqin and Hulun Buir deserts. A comprehensive analysis indicates that a northward trend of intensified human activity, with the main contribution from cultivation and a secondary contribution from grazing, was responsible for the asynchronous pattern of dune mobilization in these deserts during the late Holocene.
    Keywords deserts ; dust ; dust storms ; grazing ; Holocene epoch ; humans ; models ; uncertainty ; China
    Language English
    Dates of publication 2018-10
    Size p. 49-55.
    Publishing place Elsevier B.V.
    Document type Article
    ISSN 1875-9637
    DOI 10.1016/j.aeolia.2018.08.003
    Database NAL-Catalogue (AGRICOLA)

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  6. Article ; Online: The role of LR-TIMAP/PP1c complex in the occurrence and development of no-reflow

    Xiaoyu Quan / Xiucheng Liu / Xichun Qin / Yuzhuo Wang / Teng Sun / Zhimin Li / Lidong Zhu / Jiali Chen / Yeqing Zhou / Sandeep Singh / Hongyan Dong / Zhongming Zhang / Hao Zhang

    EBioMedicine, Vol 65, Iss , Pp 103251- (2021)

    2021  

    Abstract: Background: The presence of no-reflow can increase the risk of major adverse cardiac events and is widely regarded as an important sign of serious prognosis. Previous studies show that laminin receptor (LR) is closely related to the morphology and ... ...

    Abstract Background: The presence of no-reflow can increase the risk of major adverse cardiac events and is widely regarded as an important sign of serious prognosis. Previous studies show that laminin receptor (LR) is closely related to the morphology and function of microvessels. However, whether LR is involved in the occurrence and development of no-reflow is still unknown. Methods: In vivo, positron emission tomography (PET) perfusion imaging was performed to detect the effects of intramyocardial gene (LR-AAV and LR-siRNA-AAV) delivery treatment on the degree of no-reflow. In vitro, LC-MS/MS analysis was conducted to identify the LR phosphorylation sites of human cardiac microvascular endothelial cells (HCMECs) treated with oxygen-glucose deprivation (OGD) for 4 h. Western blot analyses were used to evaluate the phosphorylation levels of LR at residues Tyr47 (phospho-Tyr47-LR/pY47-LR) and Thr125 (phospho-Thr125-LR/pT125-LR) and their effects on the phosphorylation of VE-cadherin residue Ser665 (phospho-Ser665-VE-cad). Findings: LR over-expression, LRT125A (phosphonull) and LRY47A (phosphonull) treatments were found to reduce the level of phospho-Ser665-VE-cad, and subsequently maintain adherent junctions and endothelial barrier integrity in hypoxic environments. Mechanistically, TIMAP/PP1c can combine with LR on the cell membrane to form a novel LR-TIMAP/PP1c complex. The level of pY47-LR determined the stability of LR-TIMAP/PP1c complex. The binding of TIMAP/PP1c on LR activated the protein phosphatase activity of PP1c and regulated the level of pT125-LR. Interpretation: This study demonstrates that low level of phospho-LR reduces no-reflow area through stabilizing the LR-TIMAP/PP1c complex and promoting the stability of adherens junctions, and may help identify new therapeutic targets for the treatment of no-reflow.
    Keywords No-reflow ; Laminin receptor ; Phosphorylation ; LR-TIMAP/PP1c complex ; Medicine ; R ; Medicine (General) ; R5-920
    Language English
    Publishing date 2021-03-01T00:00:00Z
    Publisher Elsevier
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  7. Article: Aerosol optical depth retrieval from visibility in China during 1973–2014

    Zhang, Zhaoyang / Jing Wei / Lidong Zhu / Quan Wang / Weiling Wu / Xiaotong Yan / Ying Song

    Atmospheric environment. 2017 Dec., v. 171

    2017  

    Abstract: Visibility is a widely-used indicator to quantify aerosol loadings. However, there are still some uncertainties in retrieving Aerosol Optical Depth (AOD) from surface visibility data. In this study, a new method, KM-Elterman method, was developed to ... ...

    Abstract Visibility is a widely-used indicator to quantify aerosol loadings. However, there are still some uncertainties in retrieving Aerosol Optical Depth (AOD) from surface visibility data. In this study, a new method, KM-Elterman method, was developed to retrieve AOD based on visibility from 1973 to 2014 and MODIS (Aqua) AOD product from 2002 to 2014. The analysis indicated that KM-Elterman method performed better than previous algorithms, such as Qiu, Elterman, and M-Elterman algorithms. The correlation between inferred AOD and MODIS measurements from 2002 to 2010 reached at 0.942 and the Root Mean Squared Error (RMSE) is about 0.077 for annual inferred AOD. Singular Value Decomposition (SVD) method was used to investigate the consistency of spatio-temporal variations between inferred AOD and MODIS measurements from July 2002 to December 2014. The correlation between Principal Components (PCs) is well above 0.72. The spatial patterns of inferred AOD agreed well with that of MODIS datasets. Long-term AOD trends over China during 1973–2014 were analyzed using the inferred AOD and our results pointed out that rapidly increasing trends of AOD were observed before 1980 in North China Plain (NCP), Yangtze River Delta (YRD), central China, Sichuan Basin (SB), and Pearl River Delta (PRD). Slight decreasing trends were found in southwest China. The inferred AOD can be used to explore aerosol effects on climate change and Earth's radiative budget.
    Keywords aerosols ; algorithms ; atmospheric chemistry ; basins ; climate change ; data collection ; moderate resolution imaging spectroradiometer ; river deltas ; rivers ; spatial variation ; temporal variation ; uncertainty ; China ; Yangtze River
    Language English
    Dates of publication 2017-12
    Size p. 38-48.
    Publishing place Elsevier Ltd
    Document type Article
    ZDB-ID 216368-8
    ISSN 0004-6981 ; 1352-2310
    ISSN 0004-6981 ; 1352-2310
    DOI 10.1016/j.atmosenv.2017.09.004
    Database NAL-Catalogue (AGRICOLA)

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