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  • 1
    Electronic Resource
    Electronic Resource
    Polyisocyanates and the interplay of experiment and theory in the formation of lyotropic cholesteric states (1993)
    s.l. : American Chemical Society
    Macromolecules 26 (1993), S. 4551-4559 
    Details
    ISSN: 1520-5835
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ma00069a021
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Optical activity measurements on solids. 6. Solid state optical activity and circular dichroism measurements of sodium thioantimonate nonahydrate (1994)
    Springer
    Monatshefte für Chemie 125 (1994), S. 671-680 
    Details
    ISSN: 1434-4475
    Keywords: Optical activity ; Circular dichroism ; Sodium thioantimonate nonahydrate ; Suspension measurements ; Isotropic compounds
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Wir konnten zeigen, daß Messungen des optischen Circulardichroismus an in flüssigem Medium suspendierten Pulvern durchgeführt werden können. Die Brechungsindizes von Pulver und suspendierender Flüssigkeit müssen aneinander angepaßt werden; das Suspensionsmittel darf nicht wesentlich mit dem zu messenden Feststoff in Wechselwirkung treten und darf im Meßbereich nicht absorbieren. Durch Verreiben von laevo- und dextrorotatorischen Kristallen erhaltene Natriumthioantimonatnonahydratpulver (Na3SbS4·9H2O) erwiesen sich als ausgezeichnete Beispiele zur Demonstration der Methode. Messungen der optischen Drehung von laevo- und dextrorotatorischen Kristallen und Pulvern von Na3Sb4·9H2O wurden ebenfalls durchgeführt und trugen zur Charakterisierung des Salzes bei. Im Verlauf der Entwicklung der Meßtechnik wurden auch CD-Spektren von NaClO3- und NaBrO3-Kristallen aufgenommen.
    Notes: Summary We have demonstrated that optical circular dichroism (CD) measurements can be carried out on powders suspended in a liquid medium. The refractive indices of the powder and the suspending liquid must be matched, the suspending liquid must not interact significantly with the solid to be measured and must not absorb in the region where the measurements are carried out. Sodium thioantimonate nonahydrate (Na3SbS4·9H2O) powders obtained by grinding oflevo- ordextro-rotatory crystals were found to be excellent examples for the demonstration of this technique. Measurements of the optical rotation forlevo- anddextro-rotatory crystals and powders of Na3SbS4·9H2O were also carried out and provided additional characterization of this salt. In the course of developing the CD measurement technique, CD of NaClO3 and NaBrO3 crystals was also measured.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01277626
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  • 3
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    Deformation monitoring using daily repeated GNSS-R data (2023)
    In:  XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG)
    Details
    Publication Date: 2023-04-19
    Description: GNSS reflectometry has been proved to possess the capabilities for deformation monitoring by observing the carrier phase difference between the direct and reflected signals. However, to obtain the carrier phase measurement, the requirements to signal quality and monitoring geometry is relatively strict, and the application of this method is limited because of the requirement of continuous observation and the involvement of software defined radio (SDR) receiver. We present an innovative deformation monitoring method of observing signal-to-noise ratio (SNR) oscillation pattern of the interference of direct and reflected signals, by using daily repeated GNSS-R data. The direct and reflected signals were merged by radio frequency combiner, then fed into an off-the-shelf commercial GNSS receiver. Then the SNR of the interference signal can be directly outputted and recorded, and the oscillation pattern between observation days have been aligned by geometry model, and the phase shift of the oscillation pattern can be analyzed for deformation monitoring. The field experiment results show sub-centimeter level accuracy with more than 300 meters monitoring range. This new method possesses the advantages of robust, low data size and computational burden, and long monitoring range. Especially, without need of continuous observation and applicable for commercial GNSS receiver make this method more practical for long-term quasi-static deformation monitoring.
    Language: English
    Type: info:eu-repo/semantics/conferenceObject
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  • 4
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    Deep learning-driven vehicle positioning based on smartphones in GNSS-denied areas (2023)
    In:  XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG)
    Details
    Publication Date: 2023-04-26
    Description: Currently, people are accustomed to using smartphones that integrate numerous sensors for navigation. In pedestrian navigation, the walking distance is measured by a step counter utilizing the smartphone's built-in Inertial Measurement Unit (IMU). However, it is difficult to calculate the exact distance change in the smartphone-based vehicle navigation with the traditional inertial navigation method due to the low quality of IMU in smartphones. Global Navigation Satellite System (GNSS) modules play a major role in most cases of smartphone-based vehicle navigation. Since GNSS signals are frequently blocked or reflected in tunnels or urban canyons, positions provided by GNSS are unreliable in these areas. A vehicle positioning algorithm with deep learning-driven distances prediction is proposed in this work to continually enhance the location accuracy during GNSS outages. Our deep learning network consists of the Convolutional neural network (CNN) and Gated Recurrent Unit (GRU). The inputs of the network are the raw IMU and barometer data. The labels for the network training are provided by the integrated GNSS/IMU/Barometer solutions in the smartphone. In GNSS-blocked areas, IMU, barometer, and deep odometry are combined to offer precise locations for navigation systems. Results indicated that the suggested technique outperforms the Non-Holonomic Constraints (NHC) assisted IMU in the horizontal and vertical directions by 73.14% and 98.33% respectively. This proposed integrated system is implemented on Android devices to illustrate that the proposed approach function effectively.
    Language: English
    Type: info:eu-repo/semantics/conferenceObject
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  • 5
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    Deformation monitoring using daily repeated GNSS-R data (2023)
    In:  XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG)
    Details
    Publication Date: 2023-08-09
    Description: GNSS reflectometry has been proved to possess the capabilities for deformation monitoring by observing the carrier phase difference between the direct and reflected signals. This approach does not need to install GNSS receivers on the slopes and can be used to remote monitoring the slope deformation. However, to obtain the carrier phase measurement, the requirements to signal quality and monitoring geometry is relatively high, and the application of this method is limited because of the requirement of continuous observation and the involvement of a software defined radio (SDR) receiver. We present an innovative deformation monitoring method of observing signal-to-noise ratio (SNR) oscillation pattern of the interference of direct and reflected signals, by using daily repeated GNSS-R data. The direct and reflected signals were merged by radio frequency combiner, then fed into an out-of-shelve commercial GNSS receiver. The SNR of the interference signal can be directly outputted and recorded, and the oscillation pattern between observation days have been aligned by a geometry model, and the phase shift of the oscillation pattern can be analyzed for deformation monitoring. The field experiment results show sub-centimeter level accuracy with more than 300 meters monitoring range. This new method possesses the advantages of robust, low data size and computational burden, and long monitoring range. Especially, without need of continuous observation and applicable for a commercial GNSS receiver make this method more practical for long-term quasi-static deformation monitoring.
    Language: English
    Type: info:eu-repo/semantics/conferenceObject
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  • 6
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    Spoofing sensitivity assessment of traditional GNSS/INS loosely coupled integration system (2023)
    In:  XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG)
    Details
    Publication Date: 2023-09-12
    Description: The reliability of Global Navigation Satellite Systems (GNSS) is seriously threatened by spoofing attacks. Alarming the existence of spoofing attacks is the preliminary task of spoofing mitigation. A promising approach to spoofing detection is the inertial navigation system (INS) aided GNSS receiver since INS exhibits strong autonomy and independence in spoofing interferences. However, in some cases, spoofing attacks can gradually induce navigation system without the notice of GNSS/INS. Despite numerous well-established spoofing detection algorithms, there is a paucity of knowledge of the sensitivity of traditional GNSS/INS for typical meaconing (MEAC) and lift-of-aligned (LOA) spoofing cases. On this basis, this study investigates the spoofing cases where traditional GNSS/INS cannot sense, which tenders a baseline to evaluate the effectiveness of existing spoofing detection methods. The Kalman filter innovation in GNSS/INS, which indicates the consistency of GNSS and INS, is analyzed under different levels of GNSS receiver, different accuracy levels of INS, and different spoofing attacks. The theoretical analysis and test results reveal that the sensitivity of GNSS/INS predominantly depends on the accuracy of the GNSS receiver, and the influence of INS accuracy is slight. With a normal GNSS receiver (5 m of positioning accuracy), GNSS/INS with position fusion and position/velocity fusion cannot sense the MEAC attack with 〈 20 m relative spoofing position. With high-precision receivers (30 cm of positioning accuracy), the MEAC attack with 〈 1.5 m relative spoofing position can effectively attack GNSS/INS. With a relative spoofing velocity less than 1 m/s, the LOA attack is undetectable to all GNSS/INS.
    Language: English
    Type: info:eu-repo/semantics/conferenceObject
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  • 7
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    Caspase-8 and RIP kinases regulate bacteria-induced innate immune responses and cell death (2014)
    National Academy of Sciences
    Details
    Publication Date: 2014-05-05
    Print ISSN: 0027-8424
    Electronic ISSN: 1091-6490
    Topics: Biology , Medicine , Natural Sciences in General
    Published by National Academy of Sciences
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  • 8
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    Polyisocyanates and the interplay of experiment and theory in the formation of lyotropic cholesteric states (1993)
    American Chemical Society
    Details
    Publication Date: 1993-08-01
    Print ISSN: 0024-9297
    Electronic ISSN: 1520-5835
    Topics: Chemistry and Pharmacology , Physics
    Published by American Chemical Society
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  • 9
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    Pathogen blockade of TAK1 triggers caspase-8-dependent cleavage of gasdermin D and cell death (2018)
    American Association for the Advancement of Science (AAAS)
    In: Science
    Details
    Publication Date: 2018
    Description: 〈p〉Limited proteolysis of gasdermin D (GSDMD) generates an N-terminal pore-forming fragment that controls pyroptosis in macrophages. GSDMD is processed via inflammasome-activated caspase-1 or -11. It is currently unknown whether macrophage GSDMD can be processed by other mechanisms. Here, we describe an additional pathway controlling GSDMD processing. The inhibition of TAK1 or IB kinase (IKK) by the 〈i〉Yersinia〈/i〉 effector protein YopJ elicits RIPK1- and caspase-8–dependent cleavage of GSDMD, which subsequently results in cell death. GSDMD processing also contributes to the NLRP3 inflammasome–dependent release of interleukin-1β (IL-1β). Thus, caspase-8 acts as a regulator of GSDMD-driven cell death. Furthermore, this study establishes the importance of TAK1 and IKK activity in the control of GSDMD cleavage and cytotoxicity.〈/p〉
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
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  • 10
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    Corrosion and protection characteristics of zinc and manganese phosphate coatings (1997)
    Elsevier
    Details
    Publication Date: 1997-01-01
    Print ISSN: 0257-8972
    Electronic ISSN: 1879-3347
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Published by Elsevier
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