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  • 1
    Online Resource
    Online Resource
    Mars entry navigation under biases based on adaptive Huber divided difference filter
    Wiley ; 2022
    In:  International Journal of Adaptive Control and Signal Processing Vol. 36, No. 5 ( 2022-05), p. 1141-1154
    Details
    In: International Journal of Adaptive Control and Signal Processing, Wiley, Vol. 36, No. 5 ( 2022-05), p. 1141-1154
    Abstract: To address the problems of unknown disturbances and measurement outliers at Mars entry phase, three integrated navigation schemes are proposed in this study by complying with divided difference filters, that is, integrated navigation schemes based on the Huber first‐order divided difference filter (HDDF1), adaptive Huber first‐order divided difference filter (AHDDF1), and adaptive Huber second‐order divided difference filter (AHDDF2). The novel versions of predictive state estimation error covariance (PSEEC) and measurement noise covariance (MNC) are deduced by adopting the function of the Huber case to modify the cost function of the standard Kalman filter. To be specific, the HDDF1 is derived by embedding the novel PSEEC and MNC in the general first‐order divided difference filter. To more specifically enhance the performance of the filter under significant biases, an adaptive forgetting factor is introduced in the HDDF1. On that basis, the AHDDF1 is derived. Likewise, the AHDDF2 is yielded. The numerical simulations are presented to verify the effectiveness of the proposed navigation schemes.
    Type of Medium: Online Resource
    ISSN: 0890-6327 , 1099-1115
    URL: Issue
    URL: Article
    DOI: 10.1002/acs.v36.5
    DOI: 10.1002/acs.3394
    Language: English
    Publisher: Wiley
    Publication Date: 2022
    detail.hit.zdb_id: 2000340-7
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  • 2
    Online Resource
    Online Resource
    Robust adaptive divided difference filter based on forgetting factors and its applications
    Wiley ; 2019
    In:  International Journal of Adaptive Control and Signal Processing Vol. 33, No. 9 ( 2019-09), p. 1440-1455
    Details
    In: International Journal of Adaptive Control and Signal Processing, Wiley, Vol. 33, No. 9 ( 2019-09), p. 1440-1455
    Abstract: This paper proposes robust and adaptive divided difference filters (RADDFs) based on forgetting factors which are robust to dynamic systems with biases or uncertainties. The RADDFs are founded on the principle of covariance matching. The robustness of RADDFs is reflected in that it amplifies the innovation covariance to compensate the effect of dynamic biases or uncertainties. The forgetting factor is adjusted adaptively. Then, the scalar forgetting factor is further extended to multiple forgetting factors. The proposed RADDFs are illustrated by Mars entry navigation system with atmospheric density uncertainty, lift over drag ratio uncertainty, and ballistic coefficient uncertainty. To validate the filter performance by multiple forgetting factors, a typical tight coupling nonlinear system with abrupt biases is used.
    Type of Medium: Online Resource
    ISSN: 0890-6327 , 1099-1115
    URL: Issue
    URL: Article
    DOI: 10.1002/acs.v33.9
    DOI: 10.1002/acs.3041
    Language: English
    Publisher: Wiley
    Publication Date: 2019
    detail.hit.zdb_id: 2000340-7
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  • 3
    Online Resource
    Online Resource
    Highly Selective and Stable Zn (II)‐Based Metal–Organic Frameworks for the Detections of Tetracycline Antibiotic and Acetone in Aqueous System
    Wiley ; 2020
    In:  Applied Organometallic Chemistry Vol. 34, No. 7 ( 2020-07)
    Details
    In: Applied Organometallic Chemistry, Wiley, Vol. 34, No. 7 ( 2020-07)
    Abstract: Tetracycline (TC) is one of the most widely used antibiotics in aquaculture, and its good water solubility makes it a major contaminant in seawater. Therefore, it is very necessary and challenging to develop an efficient detection method. In this work, two novel metal–organic frameworks [Zn (bpydb)(bimmb) 0.5 ] n ( 1 ), {[Zn 2 (bpydb) 2 (bimb)]·[Zn (bpydb)(bimb)] ·H 2 O} n ( 2 ), (bimb = 1,4‐bis (lmidazol) butane, H 2 bypdb = 4,4′‐(4,4’‐Bipyridine‐2,6‐diyl)dibenzoic acid, bimmb = 1,4‐bis (imidazol‐1‐ylmethyl)benzene) were successfully synthesized under solvothermal conditions. Zn‐MOF 1 – 2 were characterized by X‐ray powder diffraction (PXRD), Fourier transform infrared (FT‐IR) spectroscopy and thermogravimetric analysis (TGA). As expected, 1 – 2 have excellent fluorescence properties, thermal stability and good structural stability in water. TC in water can be detected by fluorescence quenching with high selectivity. At the same time, the fluorescence quenching efficiency remains unchanged in the presence of other interfering antibiotics and in aqueous solutions of different pH values (pH = 3–10). The detection ability of 1 in real seawater has not changed substantially, showing considerable practical application prospects. Interestingly, 1 – 2 also efficiently detected traces of acetone in solution with detection limits of 0.07 μM (4.38 ppb) and 0.18 μM (10.85 ppb), respectively. In addition, the mechanism of fluorescence quenching is further discussed.
    Type of Medium: Online Resource
    ISSN: 0268-2605 , 1099-0739
    URL: Issue
    URL: Article
    DOI: 10.1002/aoc.v34.7
    DOI: 10.1002/aoc.5518
    Language: English
    Publisher: Wiley
    Publication Date: 2020
    detail.hit.zdb_id: 1480791-9
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  • 4
    Online Resource
    Online Resource
    The Relationship Between the Level of Serum ESM‐1 and Lp‐PLA2 in Patients With Acute ST‐Segment Elevation Myocardial Infarction
    Wiley ; 2021
    In:  Clinical and Translational Science Vol. 14, No. 1 ( 2021-01), p. 179-183
    Details
    In: Clinical and Translational Science, Wiley, Vol. 14, No. 1 ( 2021-01), p. 179-183
    Abstract: Acute ST‐segment elevation myocardial infarction (STEMI) is the most lethal coronary heart disease with vascular endothelium dysfunction and inflammation in the disease development process. Endothelial cell‐specific molecule 1 (ESM‐1) and lipoprotein‐associated phospholipase A2 (Lp‐PLA2) are important for the diagnosis and characterization of STEMI. To date, no studies have reported the correlation between ESM‐1 and Lp‐PLA2 levels in patients with STEMI, which may be an important predictor of the fatal disease. To measure the level of serum ESM‐1 and Lp‐PLA2, and to evaluate the relationship and the clinical significance of these two biomarkers in patients with acute STEMI, 37 inpatients with acute STEMI were sequentially enrolled in the research group and 24 study objects with normal coronary artery function were included in the control group. The measurement of the relative parameters was done by enzyme‐linked immunosorbent assay using blood samples taken from the median cubital vein while the inpatients were enrolled. The levels of serum SEM‐1 and Lp‐PLA2 were significantly higher in patients with acute STEMI than in study objects with normal coronary artery function ( P  〈  0.05). A significant correlation of serum SEM‐1 and Lp‐PLA2 was observed, leading to close linearity ( r 2  = 0.8131, P   〈  0.0001). In conclusion, the endothelium dysfunction factor ESM‐1 and inflammatory factor Lp‐PLA2 are significantly higher and correlated in patients with acute STEMI. These two factors could be novel and effective biomarkers for acute STEMI diagnosis and evaluation.
    Type of Medium: Online Resource
    ISSN: 1752-8054 , 1752-8062
    URL: Issue
    URL: Article
    DOI: 10.1111/cts.v14.1
    DOI: 10.1111/cts.12838
    Language: English
    Publisher: Wiley
    Publication Date: 2021
    detail.hit.zdb_id: 2433157-0
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  • 5
    Online Resource
    Online Resource
    Preparation and mechanical characteristics of fine‐woven cloth and punctured felt preform C f /C‐SiC‐ZrC composite
    Wiley ; 2021
    In:  International Journal of Applied Ceramic Technology Vol. 18, No. 4 ( 2021-07), p. 1330-1341
    Details
    In: International Journal of Applied Ceramic Technology, Wiley, Vol. 18, No. 4 ( 2021-07), p. 1330-1341
    Abstract: A 3D architecture carbon fiber preform, specifically fine‐woven cloth and punctured felt preform, is used to manufacture a novel advanced C f /C‐SiC‐ZrC composite. The composite matrix is produced by chemical vapor infiltration (CVI) plus precursor infiltration and pyrolysis (PIP) process and finalized by using a chemical vapor deposition (CVD) of SiC coating to make the final density of the material reach 1.95 g/cm 3 . The organic precursors of SiC and ZrC have a weight ratio of 4:1 in a xylene solute. The composite mechanical properties, such as tensile, compression, bending, shear, and Z‐direction load bearing, are introduced under analysis to find possible applications for the composite. What is more, scanning electron microscope (SEM) images are employed to illustrate the failure behavior of the ceramic composite. The results showed that the punctured filament tows will be beneficial, not only for the composite to withstand compression force up to 308.6 MPa and shear strength to 18.14 MPa but also for the alternatively stacked weave piles and short fiber layers to support the punctured bundles, as well as to hold the composite structure under mechanical forces from different orientations, which is believed to reinforce the ceramic matrix for some high pressure and severe ablation applications.
    Type of Medium: Online Resource
    ISSN: 1546-542X , 1744-7402
    URL: Issue
    URL: Article
    DOI: 10.1111/ijac.v18.4
    DOI: 10.1111/ijac.13759
    Language: English
    Publisher: Wiley
    Publication Date: 2021
    detail.hit.zdb_id: 2167226-X
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  • 6
    Online Resource
    Online Resource
    Fine‐woven punctured felt preform advanced ceramic composite for long duration hybrid fuel firing testing
    Wiley ; 2020
    In:  International Journal of Applied Ceramic Technology Vol. 17, No. 6 ( 2020-11), p. 2553-2562
    Details
    In: International Journal of Applied Ceramic Technology, Wiley, Vol. 17, No. 6 ( 2020-11), p. 2553-2562
    Abstract: A three‐dimensional fine‐woven punctured felt green body was used as a preform to generate an advanced ceramic. After chemical vapor infiltration and several cycles of precursor infiltration and pyrolysis, the pyrolysis carbon, as well as the silicon carbide and zirconium carbide ceramic matrix were formed. The advanced ceramic composite was tested under a hybrid fuel firing environment (hydrogen peroxide/ hydroxyl‐terminated polybutadiene, H 2 O 2 ‐HTPB) for a relatively long time (240 seconds) as the puncture fibers head to the firing direction. After the test, beaded and bald fibers could be identified, and the sphere particles of firing residuals sizing from 10 μm to 1 mm were found. The test results show that the material is capable of withstanding a severe firing environment up to 2 MPa with an average linear erosion rate of 0.082 mm/s.
    Type of Medium: Online Resource
    ISSN: 1546-542X , 1744-7402
    URL: Issue
    URL: Article
    DOI: 10.1111/ijac.v17.6
    DOI: 10.1111/ijac.13611
    Language: English
    Publisher: Wiley
    Publication Date: 2020
    detail.hit.zdb_id: 2167226-X
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