Relevant bibliographies by topics / Stability Enhancement

Academic literature on the topic 'Stability Enhancement'

Author: Grafiati
Published: 10 December 2022
Last updated: 28 January 2023

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Journal articles on the topic "Stability Enhancement"

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Debnath, Amit, Joseph Rualkima Rante, and Champa Nandi. "Stability Enhancement with SVC." International Journal of Computer Applications 72, no. 5 (June 26, 2013): 19–25. http://dx.doi.org/10.5120/12490-8394.

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Johar, Natasha, Tulshi Chakraborty, and Vipin Saini. "Development and Stability Enhancement of Two Combine Drugs of Cetirizine and Ambroxol." International Journal of Trend in Scientific Research and Development Volume-2, Issue-4 (June 30, 2018): 1896–902. http://dx.doi.org/10.31142/ijtsrd14468.

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Singh, Saurabh Kumar. "Power System Stability Enhancement using UPFC." International Journal for Research in Applied Science and Engineering Technology 6, no. 4 (April 30, 2018): 188–94. http://dx.doi.org/10.22214/ijraset.2018.4036.

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Shraim, Hassan, Mustapha Ouladsine, and Leonid Fridman. "Vehicle Parameter Estimation and Stability Enhancement." IFAC Proceedings Volumes 41, no. 2 (2008): 5700–5705. http://dx.doi.org/10.3182/20080706-5-kr-1001.00961.

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Boiko, Yu. "Enhancement of photochromic hologram thermal stability." Optical Memory and Neural Networks 17, no. 4 (December 2008): 271–75. http://dx.doi.org/10.3103/s1060992x0804005x.

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El-Saady, Gaber, Mohamed A. A. Wahab, Mohamed M. Hamada, and M. F. Basheer. "VOLTAGE STABILITY ENHANCEMENT USING FACTS DEVICES." JES. Journal of Engineering Sciences 40, no. 5 (September 1, 2012): 1411–33. http://dx.doi.org/10.21608/jesaun.2012.114519.

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Chen, Fang-Chu. "Fast beat counter with stability enhancement." Journal of the Acoustical Society of America 118, no. 3 (2005): 1260. http://dx.doi.org/10.1121/1.2097128.

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Shim, Taehyun, and Donald Margolis. "Using � Feedforward for Vehicle Stability Enhancement." Vehicle System Dynamics 35, no. 2 (February 1, 2001): 103–19. http://dx.doi.org/10.1076/vesd.35.2.103.2038.

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Zheng, Shuibo, Houjun Tang, Zhengzhi Han, and Yong Zhang. "Controller design for vehicle stability enhancement." Control Engineering Practice 14, no. 12 (December 2006): 1413–21. http://dx.doi.org/10.1016/j.conengprac.2005.10.005.

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Lee, Sung-Doo, Chan-Ki Kim, Jin-Young Kim, and Eung-Bo Sim. "Stability Enhancement in HVDC System with STATCOM." Engineering 03, no. 11 (2011): 1072–81. http://dx.doi.org/10.4236/eng.2011.311133.

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Dissertations / Theses on the topic "Stability Enhancement"

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Houghton, Timothy Oliver. "Axial compressor stability enhancement." Thesis, University of Cambridge, 2010. https://www.repository.cam.ac.uk/handle/1810/252194.

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Aircraft jet engines must operate in a stable manner at all times. One source of instability is compressor stall. Stall problems can be reduced by machining cavities into the compressor casing adjacent to the rotor blades. This ?casing treatment? is the focus of the present work. Two treatment configurations are tested: circumferential grooves cut into the casing above the rotor blades, and axial slots cut into the casing adjacent to the rotor blade leading edges. The performance of a single casing groove is measured at different axial locations over the blade tips. For the first time, it is shown that there are two locations where compressor stability is maximised; near the leading edge and near mid-chord. The interaction between the groove and the compressor flow field is then studied. It is found that when located near the leading edge, the groove has a strong interaction with the near-casing flow and tip leakage vortex, but when located near mid-chord, the interaction is more subtle and less damaging to efficiency. Since the groove works well in both locations, it is concluded that manipulating the tip leakage vortex is not critical for improving compressor stability. Different groove numbers and cross-sections are then tested. For multiple grooves, the effi- ciency reduction is the sum of the constituent grooves, while the stall margin improvement is less than this sum. A simple square-section groove is found difficult to improve on, although in certain circumstances, a new ?intermittent groove? geometry is beneficial. The performance of axial slots is then investigated. Different slot shapes are tested and the results added to previous work to suggest an optimum slot geometry. A computational flow study shows that large variations in blade loading occur as the blades pass the slots, which could cause noise and vibration. It is found that while the flow inside the slot is principally a quasi-steady recirculation, the interaction between the slots and blades is highly unsteady, and this unsteadiness should not be neglected in design. In general, it is found that casing treatments that generate large stability improvements cause large efficiency losses. It is shown for the first time that the performance of casing grooves can be seriously reduced by changes in the stall inception mechanism. Maximum performance is achieved when the treated compressor stalls with a spike inception. Models from the literature are tested, but do not predict the stall inception mechanism well, which makes predicting the performance of casing grooves in a given compressor hard. Finally, it is shown that designing the blades and casing treatment as a unit may improve compressor performance.
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朱太秀 and Tai-xiu Zhu. "Knowledge-based assessment and enhancement of voltage stability." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 1996. http://hub.hku.hk/bib/B31236455.

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Zhu, Tai-xiu. "Knowledge-based assessment and enhancement of voltage stability /." Hong Kong : University of Hong Kong, 1996. http://sunzi.lib.hku.hk/hkuto/record.jsp?B18061680.

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Cao, Qiang. "Stability control and throughput enhancement for slotted ALOHA networks." Thesis, Imperial College London, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.265329.

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Voolapalli, Ravi Kumar. "Stability enhancement of anaerobic digestion through intermediate product regulation." Thesis, Imperial College London, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.390626.

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Zhang, Tan. "Adaptive Energy Storage System Control for Microgrid Stability Enhancement." Digital WPI, 2018. https://digitalcommons.wpi.edu/etd-dissertations/190.

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Microgrids are local power systems of different sizes located inside the distribution systems. Each microgrid contains a group of interconnected loads and distributed energy resources that acts as a single controllable entity with respect to the grid. Their islanding operation capabilities during emergencies improve the resiliency and reliability of the electric energy supply. Due to its low kinetic energy storage capacity, maintaining microgrid stability is challenging under system contingencies and unpredictable power generation from renewable resources. This dissertation highlights the potential benefits of flexibly utilizing the battery energy storage systems to enhance the stability of microgrids. The main contribution of this research consists in the development of a storage converter controller with an additional stability margin that enables it to improve microgrid frequency and voltage regulation as well as its induction motor post-fault speed recovery. This new autonomous control technique is implemented by adaptively setting the converter controller parameters based on its estimated phase-locked loop frequency deviation and terminal voltage magnitude measurement. This work also assists in the microgrid design process by determining the normalized minimum storage converter sizing under a wide range of microgrid motor inertia, loading and fault clearing time with both symmetrical and asymmetrical fault types. This study evaluates the expandability of the proposed control methodologies under an unbalanced meshed microgrid with fault-induced feeder switching and multiple contingencies in addition to random power output from renewable generators. The favorable results demonstrate the robust storage converter controller performance under a dynamic changing microgrid environment.
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Ali, Muhammad. "Power System Stability Enhancement through Data Center Ancillary Services." Diss., North Dakota State University, 2015. https://hdl.handle.net/10365/27636.

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The primary objective of a control system is stability and steady-state performance under varying dynamics, such as faults and disturbances. The stable power system should continue to function properly in case of faults and disturbances. Stability of the power systems find applications in various domains, such as power delivery through Permanent Magnet Synchronous Generator (PMSG), Doubly-Fed Induction Generator (DFIG), and data centers. The goal of this dissertation is to design a robust control for a power system. We propose a hybrid Fault-Ride-Through (FRT) strategy for DFIG and two new PMSG grid-interfaced models, named PMSG Boost and PMSG Rectifier-Inverter. We analyze the aforesaid system using symmetrical and asymmetrical grid faults and observe the following parameters: (a) voltage support, (b) active and reactive power support, (c) stringent grid-code conduct, (d) overvoltage and overcurrent protection of rotor and stator, and (e) damped rotor oscillations in current and voltage. On the other side, we also propose a bi-directional model for power system and data centers. The goal of this research work is to increase the steady-state performance of the power system through computational capabilities of the data centers. Enormous energy consumption of data centers has a major impact on power systems by significantly increasing the electrical load. Due to the increase in electrical load, power systems are facing demand and supply miss-management problems. Therefore, power systems require fast and intelligent ancillary services to maintain robustness, reliability, and stability. Power system jobs will make this situation even more critical for data centers. In our work, we seek an Ancillary Services Model (ASM) to service data centers and power systems. In ASM, we find an optimal job scheduling technique for executing power systems? jobs on data centers in terms of low power consumption, reduced makespan, and fewer preempted jobs. The power systems? jobs include Optimal Power Flow (OPF) calculation, transmission line importance index, and bus importance index. Furthermore, a Service Level Agreement (SLA) between data centers and power systems is shown to provide mutual benefits.
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Qiu, Xiao. "Self-esteem, motivation, and self-enhancement presentation on WeChat." Scholar Commons, 2018. http://scholarcommons.usf.edu/etd/7221.

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The purpose of the present study was to analyze whether self-esteem stability moderated the association between self-esteem level and the forms of self-enhancement strategies. Previous research has found that self-esteem level can predict the forms of self-enhancement, whereas the advances in the conceptualization of self-esteem recommend that the self-esteem stability is another essential variable in terms of analyzing the relationship between self-esteem and self-enhancement. Depending on the relevant researches on use and gratification theory, which indicate that people use social media for self-enhancement and fulfilling their inner needs. This research focused on examining the forms of individual’s self-enhance on WeChat Circle of Friends (COF) and how it influenced by the interaction between self-esteem level and self-esteem stability by analyzing 305 participants in China. The results of the study show that both self-esteem level and stability was positively correlated with direct self-enhancement, but negatively correlated with indirect self-enhancement. Furthermore, the findings also show that self-esteem stability moderated the association between self-esteem level and direct self-enhancement such that individuals with stable high self-esteem reported higher levels of frequency in direct self-enhancement. However, the findings also revealed the self-esteem stability failed to moderate the association between self-esteem level and indirect self-enhancement presentation. These results suggest that self-esteem level and self-esteem stability will interact to impact the forms of self-enhancement. The importance of considering both stability and level of self-esteem in analyses of self-enhancement presentation on social media is discussed.
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Wu, Nancy Y. (Nancy Yue). "Stability enhancement of atomic timekeeping using Raman adiabatic rapid passage." Thesis, Massachusetts Institute of Technology, 2017. http://hdl.handle.net/1721.1/119294.

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Thesis: S.M., Massachusetts Institute of Technology, Department of Aeronautics and Astronautics, 2017.
Cataloged from PDF version of thesis.
Includes bibliographical references (pages 83-85).
Current state-of-the-art atomic clocks span the range from large accurate fountain clocks such as the NIST-F2 to relatively small inaccurate chip scale clocks. Small clocks with higher accuracy could greatly expand the range of applications for precision timekeeping, and enable cheaper implementation of existing applications. This type of clock may be realized by use of optical Raman interferometry based on pulsed interrogation of cold atoms. However, this method suffers from serious systematic error sources, e.g., AC Stark shift and Zeeman shift, which alter the atomic resonance frequency. A new method based on adiabatic rapid passage (ARP) has been recently demonstrated at Draper which has significantly reduced phase sensitivity to differential AC Stark shift. It is found that compared to standard Raman, use of ARP enhances timekeeping stability by a factor of three with stability of 2 x 10⁻¹² at 100 seconds. Increasing data rate may also improve short term stability. With all of the above improvements, ARP enhances short term fractional stability to 7 x 10⁻¹² at one second.
by Nancy Y. Wu.
S.M.
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Weichert, Stephanie April. "Tip clearance flows in axial compressors : stall inception and stability enhancement." Thesis, University of Cambridge, 2012. https://www.repository.cam.ac.uk/handle/1810/243400.

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The flow in the rotor tip clearance gap in an axial compressor influences the loss levels and the stall onset point. The role of tip clearance flows in the stall inception process is still debated, though. The aim of this thesis is to improve the fundamental understanding of the tip clearance flow field and its role in the stall inception process. The knowledge gained is used to develop a new casing treatment for an aero-engine core compressor. Detailed static pressure, total pressure, and velocity measurements were made in the rotor tip clearance gap at design and near stall flow conditions. The resulting overtip flow maps showed the flow field in more detail than previously possible. Flow variations around the annulus and among blade passages were analyzed and found to increase as stall is approached. This increase was not uniform around the annulus or among passages; instead, some blade passages exhibited unique behaviour compared to all the other passages. The flow variations in the unique passages were linked to small physical irregularities in compressor blading. Detailed overtip measurements were also made at stall inception to investigate the formation of the spike disturbance. These measurements, the first of their kind, showed that the disturbance which initiates the formation of the spike destabilizes the boundary between the reversed flow and incoming flow. After destabilization, reversed flow increasingly dominates the passage until the neighbouring passage is affected. The spike was found to originate most often from those regions in the compressor where the flow variations are highest and was not, as suggested by some research, associated with the forward movement of the tip leakage vortex. A new casing treatment for axial compressors was proposed and tested. The casing treatment extracts air from over the rotor blade tips and re-injects it upstream of the rotor blade leading edges into the tip region through discrete re-circulation loops. The overtip location of air extraction is unique and enables self-regulation of the amount of flow re-circulated: a minimum amount of air is re-circulated at compressor design conditions (thus minimizing any loss of efficiency) and a maximum amount of air is re-circulated near the stability limit (thus maximizing stall margin). Modest stall margin improvements (2%) were achieved without any loss of compressor efficiency at design conditions.
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Books on the topic "Stability Enhancement"

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Zhang, Xin, Jinsong He, Hao Ma, Zhixun Ma, and Xiaohai Ge. Stability Enhancement Methods of Inverters Based on Lyapunov Function, Predictive Control, and Reinforcement Learning. Singapore: Springer Nature Singapore, 2023. http://dx.doi.org/10.1007/978-981-19-7191-4.

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Nazari, Hamid. Enhancement of operational stability of glucose oxidase by immobilization on nylon. 1998.

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Baird, Rex. Stability analysis and linearity enhancement of high-order multibit delta-sigma data converters. 1994.

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Yarlagadda, Venu, A. Giriprasad, Lakshminarayana Gadupudi, O. Sobhana, and M. Naga Jyothi, eds. Optimal Placement and Sizing of SVC in Power Systems for Voltage Stability Enhancement. AkiNik Publications, 2021. http://dx.doi.org/10.22271/ed.book.1358.

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Alassouli, Hidaia Mahmood. Optimal Control of Superconducting Magnetic Energy Storage Units for Power System Dynamic Stability Enhancement. Dr. Hidaia Mahmood Alassouli, 2021.

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Ma, Zhixun, Xiaohai Ge, Zhang Xin, Jinsong He, and Hao Ma. Stability Enhancement Methods of Inverters Based on Lyapunov Function, Predictive Control, and Reinforcement Learning. Springer, 2022.

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Book chapters on the topic "Stability Enhancement"

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Ó’Fágáin, Ciarán. "Protein Stability: Enhancement and Measurement." In Methods in Molecular Biology, 101–29. New York, NY: Springer New York, 2016. http://dx.doi.org/10.1007/978-1-4939-6412-3_7.

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Tadros, Tharwat F., Martine Lemmens, Bart Levecke, and Karl Booten. "Integrating Polymeric Surfactants in Cosmetic Formulations for the Enhancement of Their Performance and Stability." In Colloid Stability, 51–60. Weinheim, Germany: Wiley-VCH Verlag GmbH & Co. KGaA, 2014. http://dx.doi.org/10.1002/9783527631193.ch42.

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Nakawiro, Worawat. "Voltage Stability Enhancement by Computational Intelligence Methods." In Dynamic Vulnerability Assessment and Intelligent Control for Sustainable Power Systems, 217–31. Chichester, UK: John Wiley & Sons, Ltd, 2018. http://dx.doi.org/10.1002/9781119214984.ch10.

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Boulou, Mahamadi, Tiguiane Yélémou, Sy Ibrahim Ouattara, and Bakary Hermane Magloire Sanou. "LEACH-S Enhancement to Ensure WSN Stability." In Lecture Notes of the Institute for Computer Sciences, Social Informatics and Telecommunications Engineering, 99–113. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-030-98005-4_8.

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Sychov, M. M. "Enhancement of the Electroluminescent Phosphor Brightness and Stability." In Ceramic Transactions Series, 49–60. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2012. http://dx.doi.org/10.1002/9781118407233.ch4.

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Arun Bhaskar, M., A. Venkatesh, S. S. Dash, C. Subramani, and M. Jagadeesh Kumar. "Modelling and Voltage Stability Enhancement Using “Sen” Transformer." In Computer Networks and Information Technologies, 224–28. Berlin, Heidelberg: Springer Berlin Heidelberg, 2011. http://dx.doi.org/10.1007/978-3-642-19542-6_36.

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Shabir, Mohammad, Sarfaraz Nawaz, and Ankit Vijayvargiya. "Voltage Stability Enhancement Using SVC in PSCAD Software." In Lecture Notes in Electrical Engineering, 141–53. Singapore: Springer Singapore, 2020. http://dx.doi.org/10.1007/978-981-15-4692-1_11.

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Berradi, Halim, Ahmed Habbani, Chaimae Benjbara, Nada Mouchfiq, and Hicham Amraoui. "Wireless Network Stability Enhancement Based on Spatial Dependency." In Advances in Smart Technologies Applications and Case Studies, 677–86. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-53187-4_74.

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Venu, Y., E. Shiva Prasad, Ramavath Gnanendar, B. Phani Sai Krishna, and S. N. V. Karthik Kumar. "FVSI Based Load Stability Enhancement with Shunt Compensator." In Advances in Automation, Signal Processing, Instrumentation, and Control, 1091–98. Singapore: Springer Singapore, 2021. http://dx.doi.org/10.1007/978-981-15-8221-9_102.

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Garg, Lokesh, and Shagufta Khan. "Application of FACTS Controllers for Enhancement of Transient Stability." In Lecture Notes in Electrical Engineering, 733–45. Singapore: Springer Singapore, 2020. http://dx.doi.org/10.1007/978-981-15-7961-5_70.

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Conference papers on the topic "Stability Enhancement"

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Shim, Taehyun, and Donald Margolis. "Using μ Feedforward for Vehicle Stability Enhancement." In SAE 2000 Automotive Dynamics & Stability Conference. 400 Commonwealth Drive, Warrendale, PA, United States: SAE International, 2000. http://dx.doi.org/10.4271/2000-01-1634.

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Swaroopan, N. M. J., and P. Somasundaram. "Transient stability enhancement with UPFC." In IET-UK International Conference on Information and Communication Technology in Electrical Sciences (ICTES 2007). IEE, 2007. http://dx.doi.org/10.1049/ic:20070665.

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Khanna, Rintu, Gurnam Singh, and T. K. Nagsarkar. "Power system stability enhancement with SMES." In 2012 International Conference on Power, Signals, Controls and Computation (EPSCICON). IEEE, 2012. http://dx.doi.org/10.1109/epscicon.2012.6175274.

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Boiko, Yuri. "Thermal stability enhancement of photochromic holograms." In SPIE OPTO: Integrated Optoelectronic Devices, edited by Hans I. Bjelkhagen and Raymond K. Kostuk. SPIE, 2009. http://dx.doi.org/10.1117/12.808613.

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Nelson, R. J. "Transient stability enhancement with FACTS control." In Sixth International Conference on AC and DC Power Transmission. IEE, 1996. http://dx.doi.org/10.1049/cp:19960369.

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Meddeb, Asma, Hajer Jmii, Nisrine Amor, and Souad Chebbi. "Voltage Stability Enhancement Using FACTS Devices." In 2020 4th International Conference on Advanced Systems and Emergent Technologies (IC_ASET). IEEE, 2020. http://dx.doi.org/10.1109/ic_aset49463.2020.9318220.

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Nikonovag, S., and V. Nikonovi. "Temperature stability enhancement of SAW devices." In 2012 IEEE 11th International Conference on Actual Problems of Electronics Instrument Engineering (APEIE). IEEE, 2012. http://dx.doi.org/10.1109/apeie.2012.6628993.

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Boonpirom, N., and K. Paitoonwattanakij. "Static voltage stability enhancement using FACTS." In 2005 International Power Engineering Conference. IEEE, 2005. http://dx.doi.org/10.1109/ipec.2005.207000.

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Hiller, Sven-Ju¨rgen, Roland Matzgeller, and Wolfgang Horn. "Stability Enhancement of a Multi Stage Compressor by Air Injection." In ASME Turbo Expo 2009: Power for Land, Sea, and Air. ASMEDC, 2009. http://dx.doi.org/10.1115/gt2009-59868.

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Cold and hot air injection upstream of the first rotor tip of a multi stage compressor was tested experimentally. The compressor operating range was extended towards lower mass flow by more than 60% indicating a better throttling capability when air injection was activated. A strong dependency of the stability enhancement on the injected mass flow and injection velocity was found. Both, increasing injection mass flow rate and increasing injection velocity led to a considerable extension of the throttling line. Comparable enhancements were achieved when reducing the number of nozzles and hence the injection mass flow. It was also found that injection of hot air, at temperatures comparable to air bled off at a following stage, had no penalty on the stability enhancement. Investigation of the influence of air injection on radial work distribution showed that only small amounts of injected air were sufficient to lead to a significant radial work re-distribution. This in turn changed the operating point of the first stage, leading to axial re-matching and thus changed the whole operational behavior of the compressor.
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Ackermann, Florian, Nicolas Bihler, and Soenke Rogalla. "Stability prediction and stability enhancement for large-scale PV Power plants." In 2016 IEEE 7th International Symposium on Power Electronics for Distributed Generation Systems (PEDG). IEEE, 2016. http://dx.doi.org/10.1109/pedg.2016.7527017.

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Reports on the topic "Stability Enhancement"

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Solberg, Myron. Enhancement of Food Stability. Fort Belvoir, VA: Defense Technical Information Center, October 1996. http://dx.doi.org/10.21236/ada393723.

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Serio, Michael A., Erik Kroo, Ripudaman Malhotra, and Donald F. McMillen. Thermal Stability Enhancement of JP-5. Fort Belvoir, VA: Defense Technical Information Center, September 1998. http://dx.doi.org/10.21236/ada360085.

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Cain, P., J. D. Brown, and J. A. Amirault. Stability enhancement of coal measures strata with waterbased chemical agents. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 1986. http://dx.doi.org/10.4095/304879.

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Dagle, J. E., D. W. Winiarski, and M. K. Donnelly. End-use load control for power system dynamic stability enhancement. Office of Scientific and Technical Information (OSTI), February 1997. http://dx.doi.org/10.2172/484515.

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Hillhouse, Hugh, Marina Meila, and David Beck. Machine-Learning-Assisted Enhancement of Perovskite Stability and Photovoltaic Performance. Office of Scientific and Technical Information (OSTI), September 2022. http://dx.doi.org/10.2172/1885163.

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Glazer, Itamar, Randy Gaugler, Daniel Segal, Parwinder Grewal, Yitzhak Spiegel, and Senthamizh Selvan. Genetic Enhancement of Environmental Stability and Efficacy of Entomopathogenic Nematodes for Biological Control. United States Department of Agriculture, August 1995. http://dx.doi.org/10.32747/1995.7695833.bard.

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The overall obejctive of the research project was to enhance the intrinsic biological control potential of entomopathogenic nematodes through genetic manipulation. We have chosen heat and desiccation tolerance as prime traits to be enhanced in order to increase the overall efficacy of these nematodes against insect pests under harsh conditions. Initially, we used mutagenesis and selection approaches to enhance these traits. In the mutagenesis experiments several morphological mutants of Heterorhabditis bacteriophora HP88 were isolated and characterized phenotypically and genetically. Infective juveniles of H. bacteriophora HP88 were subjected to heat and desiccation selection regimes for several generations. Small increase was recorded, after 4 and 6 rearing cycles for both traits. However, in both selection regimes a significant deterioration in the reproductive capability of the nematodes was observed. In a screen of new nematode populations, from arid regions in Israel, a heat tolerant (IS5 strain) and desiccation tolerant (IS6 strain) were isolated. Both strains were taxonomically identified and their beneficial characteristics (environmental tolerance, insecticidal virulence and reproduction) were determined. We further investigated the stability of the enhanced heat tolerance trait in, and the storage capacity of, the newly discovered IS5 strain. Genetic studies demonstrated that the heat tolerance of the IS5 strain is genetically based and is dominant. The trait for heat tolerance was transferred from the IS5 strain to the HP88 strain of H. bacteriophora. The transfer was accomplished by allowing the heat tolerant strain (IS5) to mate with the commercial strain (HP88). The hybrid nature of the progeny was confirmed using a recessive marker mutant of the HP88 strain (H-dpy-2). We have used (RAPD-PCR) to compare genetic variation in the IS5 and the HP88 strains of H. baceriophora. The results indicated that genetic variation in the HP88 was significantly less than in the IS5 strain which was recently isolated from the field. The new IS5 strain may be used as an effective biological control agent in warm environments. In addition, IS5 can be used as a genetic source for cross-hybridization with other H. bacteriophora strains.
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Asaturov, M. U., and G. K. Korendyasev. ENHANCEMENT OF VIBRATION STABILITY OF TERMINAL EQUIPMENT CASES OF VOICE COMMUNICATION CONTROL SYSTEMS (VCCS) FOR AIR TRAFFIC CONTROLLERS. DOI СODE, 2021. http://dx.doi.org/10.18411/vntr2021-163-1.

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Singhvi, Punit, Javier García Mainieri, Hasan Ozer, and Brajendra Sharma. Rheology-Chemical Based Procedure to Evaluate Additives/Modifiers Used in Asphalt Binders for Performance Enhancements: Phase 2. Illinois Center for Transportation, June 2021. http://dx.doi.org/10.36501/0197-9191/21-020.

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Abstract:
The increased use of softer binders in Illinois over the past decade is primarily attributed to the increased use of recycled materials in asphalt pavement construction. The shift in demand of using PG 58-28 over PG 64-22 has resulted in potential alternative methods to produce softer binders more economically using proprietary products. However, there are challenges in using these proprietary products for asphalt modification because of uncertainty in their long-term performance and significant variability in binder chemistry. The current SuperPave performance grading specification for asphalt binders is insufficient in differentiating binders produced from these modifiers. Therefore, the objective of this study is to evaluate the performance of various softener-type asphalt binder modifiers using a wide array of rheological and chemistry tests for their integration into the Illinois Department of Transportation’s material specifications. The small-strain rheological tests and their parameters allowed for consistent grouping of modified binders and can be used as surrogates to identify performing and nonperforming asphalt binders. A new parameter, Δ|G*|peak τ, was developed from the linear amplitude sweep test and showed potential to discriminate binders based on their large-strain behavior. Chemistry-based parameters were shown to track aging and formulation changes. The modifier sources were identified using fingerprint testing and were manifested in the modified binder chemical and compositional characteristics. The two sources of base binders blended with the modifiers governed the aging rate of the modified binders. Mixture performance testing using the Illinois Flexibility Index Test and the Hamburg Wheel-Track Test were consistent with the rheological and chemical findings, except for the glycol amine-based modified binder, which showed the worst cracking performance with the lowest flexibility index among the studied modifiers. This was contrary to its superior rheological performance, which may be attributed to lower thermal stability, resulting in high mass loss during mixing. According to the characterization of field-aged binders, laboratory aging of two pressurized aging vessel cycles or more may represent realistic field aging of 10 to 15 years at the pavement surface and is able to distinguish modified binders. Therefore, an extended aging method of two pressurized aging vessel cycles was recommended for modified binders. Two different testing suites were recommended for product approval protocol with preliminary thresholds for acceptable performance validated with field-aged data.
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Qamhia, Issam, and Erol Tutumluer. Evaluation of Geosynthetics Use in Pavement Foundation Layers and Their Effects on Design Methods. Illinois Center for Transportation, August 2021. http://dx.doi.org/10.36501/0197-9191/21-025.

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This report presents findings of a research effort aimed at reviewing and updating existing Illinois Department of Transportation (IDOT) specifications and manuals regarding the use of geosynthetic materials in pavements. The project consisted of three tasks: evaluate current IDOT practice related to the use of geosynthetics; review research and state of the practice on geosynthetics applications, available products, design methods, and specifications; and propose recommendations for geosynthetic solutions in pavements to modernize IDOT’s practices and manuals. The review of IDOT specifications revealed that geotextiles are the most used geosynthetic product in Illinois, followed by geogrids. Several of IDOT’s manuals have comprehensive guidelines to properly design and construct pavements with geosynthetics, but several knowledge gaps and potential areas for modernization and adoption of new specifications still exist. Based on the review of the available design methods and the most relevant geosynthetic properties and characterization methods linked to field performance, several updates to IDOT’s practice were proposed. Areas of improvement are listed as follows. First, establish proper mechanisms for using geogrids, geocells, and geotextiles in subgrade restraint and base stabilization applications. This includes using shear wave transducers, i.e., bender elements, to quantify local stiffness enhancements and adopting the Giroud and Han design method for subgrade restraint applications. Second, update IDOT’s Subgrade Stability Manual to include property requirements for geogrids, geotextiles, and geocells suitable for subgrade restraint applications. Third, establish proper standards on stabilization, separation, and pumping resistance for geotextiles by incorporating recent research findings on geotextile clogging and permeability criteria. Fourth, promote the use of modern geosynthetic products, such as geotextiles with enhanced lateral drainage, and fifth, elaborate on proper methods for construction/quality control measures for pavements with geosynthetics.
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