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排序方式: 共有97条查询结果,搜索用时 15 毫秒
1.
Self‐Sealing Porous Silicon‐Calcium Silicate Core–Shell Nanoparticles for Targeted siRNA Delivery to the Injured Brain 下载免费PDF全文
2.
Monitoring agricultural drought for arid and humid regions using multi-sensor remote sensing data 总被引:11,自引:0,他引:11
While existing remote sensing-based drought indices have characterized drought conditions in arid regions successfully, their use in humid regions is limited. We propose a new remote sensing-based drought index, the Scaled Drought Condition Index (SDCI), for agricultural drought monitoring in both arid and humid regions using multi-sensor data. This index combines the land surface temperature (LST) data and the Normalized Difference Vegetation Index (NDVI) data from Moderate Resolution Imaging Spectroradiometer (MODIS) sensor, and precipitation data from Tropical Rainfall Measuring Mission (TRMM) satellite. Each variable was scaled from 0 to 1 to discriminate the effect of drought from normal conditions, and then combined with the selected weights. When tested against in-situ Palmer Drought Severity Index (PDSI), Palmer's Z-Index (Z-Index), 3-month Standardized Precipitation Index (SPI), and 6-month SPI data during a ten-year (2000-2009) period, SDCI performed better than existing indices such as NDVI and Vegetation Health Index (VHI) in the arid region of Arizona and New Mexico as well as in the humid region of North Carolina and South Carolina. The year-to-year changes and spatial distributions of SDCI over both arid and humid regions generally agreed to the changes documented by the United States Drought Monitor (USDM) maps. 相似文献
3.
Using the blogosphere as an enabling IT environment, this paper investigates how self-concept influences virtual self-presentation behavior and the use of IT artifacts. Self-presentation theory is adapted from the social psychology literature to develop a theoretical research model of virtual self-presentation. We tested the research model and hypotheses with data collected from 312 bloggers. Structural equation analysis of this data reveals a nomological net of self-concept leading to IT-enabled virtual self-presentation and the use of IT artifacts. Our findings provide a new perspective of users as heterogeneous individuals who have various self-concepts that change the sequence and dynamics among users, IT artifacts, and tasks. In contrast to traditional systems, in the social context of virtual self-presentation, users are the primary and essential drivers who determine vaguely defined tasks and systems. 相似文献
4.
Jeoungkun Kim Soongeun Hong Jinyoung Min Heeseok Lee 《Expert systems with applications》2011,38(8):9530-9542
Although ASP (Application Service Provider) has the potential to fundamentally change the manner in which IT services are provided for user firms, current ASPs often fail to provide good results in accumulating and retaining customers. To fill the gap between the expected benefits of application service and its disappointing results in the real world, we present a conceptual model including three quality measures – System Quality, Information Quality, and Service Quality. To extend the horizons of ASP acceptance, this study sharpens the model that these quality measures regulate Satisfaction and Trust, which lead to Continuance Intention. We test the research model and hypotheses through the use of the data from 203 small and medium enterprises with application service experience. Data analysis results using LISREL reveal that Satisfaction and Trust have significant effects on a client firm’s Continuance Intention. Trust is found to be the most salient determinant while previous studies mainly focused on the role of Satisfaction. Furthermore, an empirical support is found for the direct effect of Service Quality on Continuance Intention as well as its mediating effects. 相似文献
5.
High‐Performance Sodium‐Ion Hybrid Supercapacitor Based on Nb2O5@Carbon Core–Shell Nanoparticles and Reduced Graphene Oxide Nanocomposites 下载免费PDF全文
Eunho Lim Changshin Jo Min Su Kim Mok‐Hwa Kim Jinyoung Chun Haegyeom Kim Jongnam Park Kwang Chul Roh Kisuk Kang Songhun Yoon Jinwoo Lee 《Advanced functional materials》2016,26(21):3711-3719
Sodium‐ion hybrid supercapacitors (Na‐HSCs) have potential for mid‐ to large‐scale energy storage applications because of their high energy/power densities, long cycle life, and the low cost of sodium. However, one of the obstacles to developing Na‐HSCs is the imbalance of kinetics from different charge storage mechanisms between the sluggish faradaic anode and the rapid non‐faradaic capacitive cathode. Thus, to develop high‐power Na‐HSC anode materials, this paper presents the facile synthesis of nanocomposites comprising Nb2O5@Carbon core–shell nanoparticles (Nb2O5@C NPs) and reduced graphene oxide (rGO), and an analysis of their electrochemical performance with respect to various weight ratios of Nb2O5@C NPs to rGO (e.g., Nb2O5@C, Nb2O5@C/rGO‐70, ‐50, and ‐30). In a Na half‐cell configuration, the Nb2O5@C/rGO‐50 shows highly reversible capacity of ≈285 mA h g?1 at 0.025 A g?1 in the potential range of 0.01–3.0 V (vs Na/Na+). In addition, the Na‐HSC using the Nb2O5@C/rGO‐50 anode and activated carbon (MSP‐20) cathode delivers high energy/power densities (≈76 W h kg?1 and ≈20 800 W kg?1) with a stable cycle life in the potential range of 1.0–4.3 V. The energy and power densities of the Na‐HSC developed in this study are higher than those of similar Li‐ and Na‐HSCs previously reported. 相似文献
6.
Seong-Joon Baek Aaron Park Jinyoung Kim Aigou Shen Jiming Hu 《Chemometrics and Intelligent Laboratory Systems》2009,98(1):24-30
In this paper, we consider a new background elimination method for Raman spectra. The proposed method is based on peak detection, smoothing, and interpolation. Since the background is usually slowly varying with respect to wavelength, we could estimate the background by eliminating significant peaks. For this purpose, we seek the peaks by inspecting the smoothed derivative of a given spectrum. After clipping out the corresponding peak regions, we estimate the background by applying a modified linear interpolation. Then the background is eliminated from the measured Raman spectrum by simple subtraction. The experimental results showed that the proposed method gave satisfactory results for real Raman spectra as well as synthetic data. As the proposed method requires no prior knowledge of spectrum, we expect that the method could be applied to other spectral data as well. 相似文献
7.
Jinuk Kwon Jinyoung Kim Jeeeun Lee Patrick Han Dongmyung Park Haksoo Han 《Polymer Composites》2014,35(11):2214-2220
A novel high‐performance material, carbon black (CB) polyimide (PI), was obtained by the chemical synthesis of CB (carbon black N326) with PI. Following its synthesis, several analyses were carried out to investigate the thermal and mechanical properties of the newly synthesized CB‐PI. The thermal decomposition temperature of CB‐PI compared to PI increased by 76°C from 508 to 584°C. The glass transition temperature of CB‐PI as evaluated by differential scanning calorimetry increased by 204°C from 379 to 583°C compared to that of PI. Moreover, the mechanical strength of CB‐PI increased by 16% compared to that of PI. In addition, the analyses confirm that CB and PI in the synthesized CB‐PI were chemically crosslinked, which was shown to be responsible for the superior thermal and mechanical properties of the CB‐PI. POLYM. COMPOS., 35:2214–2220, 2014. © 2014 Society of Plastics Engineers 相似文献
8.
The functionalization of fullerene nanowhiskers was accomplished by non-covalent π-π interaction using pyrenebutanoic acid, succinimidyl ester to immobilize target molecules on the nanowhiskers. Fourier-transform infrared spectroscopy and fluorescence microscopy proved that the fullerene nanowhiskers were functionalized without damaging the nanostructure. 相似文献
9.
Jonathan M. Zuidema Courtney M. Dumont Joanna Wang Wyndham M. Batchelor Yi‐Sheng Lu Jinyoung Kang Alessandro Bertucci Noel M. Ziebarth Lonnie D. Shea Michael J. Sailor 《Advanced functional materials》2020,30(25)
Scaffolds made from biocompatible polymers provide physical cues to direct the extension of neurites and to encourage repair of damaged nerves. The inclusion of neurotrophic payloads in these scaffolds can substantially enhance regrowth and repair processes. However, many promising neurotrophic candidates are excluded from this approach due to incompatibilities with the polymer or with the polymer processing conditions. This work provides one solution to this problem by incorporating porous silicon nanoparticles (pSiNPs) that are preloaded with the therapeutic into a polymer scaffold during fabrication. The nanoparticle‐drug‐polymer hybrids are prepared in the form of oriented poly(lactic‐co‐glycolic acid) nanofiber scaffolds. Three different therapeutic payloads are tested: bpV(HOpic), a small molecule inhibitor of phosphatase and tensin homolog (PTEN); an RNA aptamer specific to tropomyosin‐related kinase receptor type B (TrkB); and the protein nerve growth factor (NGF). Each therapeutic is loaded using a loading chemistry that is optimized to slow the rate of release of these water‐soluble payloads. The drug‐loaded pSiNP‐nanofiber hybrids release approximately half of their TrkB aptamer, bpV(HOpic), or NGF payload in 2, 10, and >40 days, respectively. The nanofiber hybrids increase neurite extension relative to drug‐free control nanofibers in a dorsal root ganglion explant assay. 相似文献
10.
Tracking the Fate of Porous Silicon Nanoparticles Delivering a Peptide Payload by Intrinsic Photoluminescence Lifetime 下载免费PDF全文
Yusung Jin Dokyoung Kim Hajung Roh Sojeong Kim Sazid Hussain Jinyoung Kang Chan‐Gi Pack Jun Ki Kim Seung‐Jae Myung Erkki Ruoslahti Michael J. Sailor Song Cheol Kim Jinmyoung Joo 《Advanced materials (Deerfield Beach, Fla.)》2018,30(35)
A nanoparticle system for systemic delivery of therapeutics is described, which incorporates a means of tracking the fate of the nanocarrier and its residual drug payload in vivo by photoluminescence (PL). Porous silicon nanoparticles (PSiNPs) containing the proapoptotic antimicrobial peptide payload, D[KLAKLAK]2, are monitored by measurement of the intrinsic PL intensity and the PL lifetime of the nanoparticles. The PL lifetime of the PSiNPs is on the order of microseconds, substantially longer than the nanosecond lifetimes typically exhibited by conventional fluorescent tags or by autofluorescence from cells and tissues; thus, emission from the nanoparticles is readily discerned in the time‐resolved PL spectrum. It is found that the luminescence lifetime of the PSiNP host decreases as the nanoparticle dissolves in phosphate‐buffered saline solution (37 °C), and this correlates with the extent of release of the peptide payload. The time‐resolved PL measurement allows tracking of the in vivo fate of PSiNPs injected (via tail vein) into mice. Clearance of the nanoparticles through the liver, kidneys, and lungs of the animals is observed. The luminescence lifetime of the PSiNPs decreases with increasing residence time in the mice, providing a measure of half‐life for degradation of the drug nanocarriers. 相似文献