Relevant bibliographies by topics / Ultra-tight

Academic literature on the topic 'Ultra-tight'

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Published: 14 March 2023

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Journal articles on the topic "Ultra-tight"

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Agyingi, Collins Amburo. "Ultra-Quasi-Metrically Tight Extensions of Ultra-Quasi-Metric Spaces." Chinese Journal of Mathematics 2015 (September 30, 2015): 1–7. http://dx.doi.org/10.1155/2015/646018.

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The concept of the tight extension of a metric space was introduced and studied by Dress. It is known that Dress theory is equivalent to the theory of the injective hull of a metric space independently discussed by Isbell some years earlier. Dress showed in particular that for a metric space X the tight extension TX is maximal among the tight extensions of X. In a previous work with P. Haihambo and H.-P. Künzi, we constructed the tight extension of a T0-quasi-metric space. In this paper, we continue these investigations by presenting a similar construction in the category of UQP-metric spaces and nonexpansive maps.
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Yao, Shanshan, Qi Wang, Yanfeng Bai, and Huazhou Li. "A practical gas permeability equation for tight and ultra-tight rocks." Journal of Natural Gas Science and Engineering 95 (November 2021): 104215. http://dx.doi.org/10.1016/j.jngse.2021.104215.

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Darabi, Hamed, A. Ettehad, F. Javadpour, and K. Sepehrnoori. "Gas flow in ultra-tight shale strata." Journal of Fluid Mechanics 710 (September 27, 2012): 641–58. http://dx.doi.org/10.1017/jfm.2012.424.

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AbstractWe study the gas flow processes in ultra-tight porous media in which the matrix pore network is composed of nanometre- to micrometre-size pores. We formulate a pressure-dependent permeability function, referred to as the apparent permeability function (APF), assuming that Knudsen diffusion and slip flow (the Klinkenberg effect) are the main contributors to the overall flow in porous media. The APF predicts that in nanometre-size pores, gas permeability values are as much as 10 times greater than results obtained by continuum hydrodynamics predictions, and with increasing pore size (i.e. of the order of the micrometre), gas permeability converges to continuum hydrodynamics values. In addition, the APF predicts that an increase in the fractal dimension of the pore surface leads to a decrease in Knudsen diffusion. Using the homogenization method, a rigorous analysis is performed to examine whether the APF is preserved throughout the process of upscaling from local scale to large scale. We use the well-known pulse-decay experiment to estimate the main parameter of the APF, which is Darcy permeability. Our newly derived late-transient analytical solution and the late-transient numerical solution consistently match the pressure decay data and yield approximately the same estimated value for Darcy permeability at the typical core-sample initial pressure range and pressure difference. Other parameters of the APF may be determined from independent laboratory experiments; however, a pulse-decay experiment can be used to estimate the unknown parameters of the APF if multiple tests are performed and/or the parameters are strictly constrained by upper and lower bounds.
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Mews, Alhubail, and Barati. "A Review of Brittleness Index Correlations for Unconventional Tight and Ultra-Tight Reservoirs." Geosciences 9, no. 7 (July 19, 2019): 319. http://dx.doi.org/10.3390/geosciences9070319.

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Rock brittleness is pivotal in the development of the unconventional reservoirs. However, the existence of various methods of calculating the brittleness index (BI) such as the mineral-based brittleness index (MBI), the log-based brittleness index (LBI), and the elastic-based brittleness index (EBI) lead to inconclusive estimations of the brittleness index. Hence, in this work, the existing correlations are applied on prolific unconventional plays in the U.S. such as the Marcellus, Bakken, Niobrara, and Chattanooga Formation to examine the various BI methods. A detailed comparison between the MBI, LBI, and EBI has also been conducted. The results show that a universal correlation cannot be derived in order to define brittleness since it is a function of lithology. Correlation parameters vary significantly from one shale play to another. Nevertheless, an overall trend shows that abundant quartz and carbonates content yield high brittleness values, while the high clay content and porosity lower the rock brittleness.
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Yang, Chun Cheng, Hong Jun Yin, Tang Qian Zhu, and Lei Wang. "A Model for Predicting Productivity of Multi-Staged Fractured Horizontal Wells in Ultra-Low Permeability Tight Gas Reservoirs." Advanced Materials Research 934 (May 2014): 143–49. http://dx.doi.org/10.4028/www.scientific.net/amr.934.143.

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Based on the equivalent radius model and superposition potential, a productivity model for ultra-low permeability tight gas reservoirs was developed, which considered the influence of the threshold pressure gradient and the variable mass flow in fractures, and pressure loss inside the wellbore. With examples for capacity sensitive factors are analyzed. The results show that the threshold pressure gradient must be accounted to evaluate the productivity in ultra-low permeability tight gas reservoirs; after considering wellbore pressure loss; close toe fractures inflow velocity segment has been reduced; the larger matrix permeability, the greater the optimum fracture conductivity; When the number of fracture is more, the greater the impact on the capacity of the fracture angle. The research results provide a scientific basis for the design of multi-fractured horizontal wells in the ultra-low permeability tight gas reservoirs.
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Mautner, Andreas, Koon-Yang Lee, Tekla Tammelin, Aji P. Mathew, Alisyn J. Nedoma, Kang Li, and Alexander Bismarck. "Cellulose nanopapers as tight aqueous ultra-filtration membranes." Reactive and Functional Polymers 86 (January 2015): 209–14. http://dx.doi.org/10.1016/j.reactfunctpolym.2014.09.014.

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Sheng, Qiang, Livio Gibelli, Jun Li, Matthew K. Borg, and Yonghao Zhang. "Dense gas flow simulations in ultra-tight confinement." Physics of Fluids 32, no. 9 (September 1, 2020): 092003. http://dx.doi.org/10.1063/5.0019559.

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Zhao, Jiafan, Xin Zhao, Quanhu Li, and Jingyu Zhang. "Research on ultra-tight integrated navigation method based on CKF filtering algorithm." Journal of Physics: Conference Series 2221, no. 1 (May 1, 2022): 012048. http://dx.doi.org/10.1088/1742-6596/2221/1/012048.

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Abstract This paper takes the SINS/BDS ultra-tight integrated navigation system as the background of research. Based on the existing integrated navigation nonlinear filtering algorithm, an ultra-tight integrated navigation method based on CKF filtering algorithm is proposed. Compared with the EKF and UKF algorithms, the CKF algorithm reduces the errors caused by intercepting higher order terms in the EKF, overcomes the problem of difficult to determine adjustable parameters in the UKF in practical applications, and greatly reduces the computational effort. Because of the above advantages nowadays the research focus of filtering algorithms is more on CKF algorithm related methods. The EKF, UKF and CKF are applied to the SINS/BDS ultra-tight integrated navigation system for simulation and comparison analysis in order to verify the performance of the algorithm. The simulation results show that the CKF algorithm is an effective and feasible algorithm for integrated navigation method because its stability, filtering accuracy and adaptability are synthetically better than those of the EKF and UKF algorithms.
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Li, Qunsheng, and Yan Zhao. "An Innovative High-Precision Scheme for a GPS/MEMS-SINS Ultra-Tight Integrated System." Sensors 19, no. 10 (May 17, 2019): 2291. http://dx.doi.org/10.3390/s19102291.

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The Doppler-assisted error provided by a low-precision microelectromechanical system (MEMS) strapdown inertial navigation system (SINS) increases rapidly. Therefore, the bandwidth of the tracking loop for a global positioning system (GPS)/MEMS-SINS ultra-tight integration system is too narrow to track Doppler shift. GPS measurement error is correlated with the MEMS-SINS velocity error when the Doppler-assisted error exists, leading to tracking loop lock loss. The estimated precision of the integrated Kalman filter (IKF) also decreases. Even the integrated system becomes unstable. To solve this problem, an innovative GPS/MEMS-SINS ultra-tight integration scheme based on using high-precision carrier phase measurements as the IKF measurements is proposed in this study. By assisting the tracking loop with time-differenced carrier phase (TDCP) velocity, the carrier loop noise bandwidth and code correlator spacing are reduced. The tracking accuracies of the carrier and code are increased. The navigation accuracy of GPS/MEMS-SINS ultra-tight integration is further improved.
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Gao, G., and G. Lachapelle. "A Novel Architecture for Ultra-Tight HSGPS-INS Integration." Journal of Global Positioning Systems 7, no. 1 (June 2008): 46–61. http://dx.doi.org/10.5081/jgps.7.1.46.

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Dissertations / Theses on the topic "Ultra-tight"

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Swarna, Ravindra Babu Surveying &amp Spatial Information Systems Faculty of Engineering UNSW. "Ultra-tight integration of GPS/Pseudolites/INS: system design and performance analysis." Awarded by:University of New South Wales, 2006. http://handle.unsw.edu.au/1959.4/40075.

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The complementary advantages of GPS and INS have been the principle driving factor to integrate these two navigation systems as an integrated GPS/INS system in various architectural forms to provide robust positioning. Although the loosely coupled and tightly coupled GPS/INS systems have been in existence for over a decade or two and performed reasonably well, nevertheless, the tracking performance was still a concern in non-benign environments such as dynamic scenarios, indoor environments, urban areas, under foliages etc., where the GPS tracking loops lose lock due to the signals being weak, subjected to excessive dynamics or completely blocked. The motivation of this research, therefore, was to address these limitations with an integrated GPS/Pseudolite/INS system using ultra-tight integration architecture. The main research contributions are summarised as below: (a) The performance of the tracking loops in dynamic scenarios were analysed in detail with both conventional and ultra-tight software receivers. The stochastic modelling of the INS-derived Doppler is of utmost importantance in enhancing the benefits of ultra-tight integration, and therefore, two popular stochastic techniques??? Gauss Markov (GM) and Autoregressive (AR), were investigated to model the Doppler signal. The simulation results demonstrate that the AR method is capable of producing better accuracies and is more efficient. The algorithms to determine the AR parameters (order and coefficients) were also provided. (b) The various mathematical relationships that elicit the understanding of the ultra-tightly integrated system were derived in detail. The Kalman filter design and its implementation were also provided. Various simulation and real-time experiments were conducted to study the performance of the filter, and the results confirm the underlying assumptions in the theoretical analyses and the mathematical derivations. Covariance analysis was also performed to study the convergence and stability effects of the filter. (c) Interpolator design using signal processing techniques were proposed to increase the sampling rate of the INS-derived Doppler. To efficiently realise the interpolator transfer function, two optimal techniques were investigated ??? Polyphase and Cascaded Integrator Comb (CIC), and our results show that CIC was more efficient than polyphase in accuracy and real-time implementations. (d) The integration of Pseudolites (PL) with INS in ultra-tight configuration was analysed for an indoor environment. The acquisition and tracking performances of ???Pseudolites-only??? and ???Pseudolite/INS??? modes were compared to study the impact of the inertial signals aiding. The results demonstrate that aiding of the inertial signals with the baseband loops (acquisition and tracking) improve the overall tracking performance. An overview on the effects of the pseudolite signal propagation is also given. (e) Simulation and real-time experiments have been conducted to evaluate the proposed algorithms and the overall design of the ultra-tightly integrated system. A comparison was also done between GPS/PL/INS and GPS/INS integrated systems to study the potential advantages of the pseudolite integration. The details of the field experiment are provided. The data from a real-time experiment was processed to further evaluate the robustness of the system. The results confirm that the developed mathematical models and algorithms are correct.
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Niekamp, Philip M. "Investigation of the Turn-of-Nut Installation Procedure for XTB-HX Fasteners." University of Cincinnati / OhioLINK, 2015. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1421921620.

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Lee, Ting-Yu, and 李庭宇. "Fuzzy Strong Tracking Nonlinear Filter for Ultra-Tight GPS/INS Integration." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/88667153413447869119.

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碩士
國立臺灣海洋大學
通訊與導航工程系
98
Ultra-tight integration is becoming more and more important in the future. Many advantages about the robustness in the high dynamics and the immunity to the jamming and interference. Due to these advantages, the next generation integrated GPS/INS navigation systems will be based on the ultra-tightly coupled system. The UKF employs a set of sigma points by deterministic sampling, such that the linearization process is not necessary, and therefore the error caused by linearization as in the traditional extended Kalman filter (EKF) can be avoided. An ultra-tight navigation integration processing scheme, called the strong tracking unscented Kalman filter (STUKF), is based on the combination of unscented Kalman filter (UKF) and strong tracking filter (STF). As a type of adaptive filter, the STF is essentially a nonlinear smoother algorithm that employs suboptimal multiple fading factors, in which the softening factors are involved. In order to resolve the shortcoming in traditional approach for selecting the softening factor through personal experience or computer simulation, a novel scheme called the fuzzy strong tracking unscented Kalman filter (FSTUKF) is presented where the Fuzzy Logic Adaptive System (FLAS) is incorporated for determining the softening factor. This paper carries out a fuzzy strong tracking unscented Kalman filter (FSTUKF) application approach for the ultra-tight GPS/INS integration. Through analyzing the relationship between GPS (I&Q) correlator outputs and navigation states (position and velocity), the EKF based system was presented an the baseline design. Finally, the application method of FSTUKF for the ultra-tight integration system is proposed. The proposed FSTUKF algorithm shows promising results in estimation accuracy when applied to the ultra-tight integrated navigation system application, as compared to the EKF, UKF and STUKF approaches.
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Hu, Chia-Wei, and 胡家維. "The Ultra-Tight GPS/INS Navigation Algorithm Using Interacting Multiple Model Nonlinear Filtering." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/82546030858145814901.

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碩士
國立臺灣海洋大學
通訊與導航工程系
98
In this thesis, application of the ultra-tight integration navigation algorithm using interacting multiple model (IMM) nonlinear filtering is studied for GPS/INS. The ultra-tight integration is also known as deep integration, which increases the receiver tracking bandwidth and suppresses noise, so as to promote GPS receiver performance. When the GPS signal losses, assistance of the aiding INS in the receiver's acquisition and re-acquisition process can still use the position, velocity on the delay lock loop (DLL) and phase lock loop (PLL) to promote the receiver’s tracking loop performance. Using the structure of ultra-tight in the receiver has many advantages, such as disturbance rejection and multi-path rejection, promoting high dynamic performance, tracking weak signals, improving the accuracy, urban or indoor positioning capability, shorten acquisition time, improved phase locked loop bandwidth, achieve a more accurate Doppler frequency shift and measurement of phase, etc. The unscented Kalman filter (UKF) employ a set of sigma points through deterministic sampling, such that the linearization process is not necessary, and therefore the error caused by linearization as in the traditional extended Kalman filter (EKF) can be avoided. There is no need to evaluate the Jacobian matrix. The use of IMM, which describes a set of switching models, finally provides the suitable value of process noise covariance. Consequently, the resulting sensor fusion strategy can efficiently deal with the nonlinear problem in vehicle navigation. The proposed IMMUKF algorithm shows significant improvement in navigation estimation accuracy as compared to the UKF approaches.
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Yu-Chi, Wang, and 王鈺騏. "Investigation of the Doppler Velocity Aiding for Ultra-Tight GPS/INS Navigation Systems." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/54500063672919531661.

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碩士
國立臺灣海洋大學
通訊與導航工程學系
99
This paper proposes a comprehensive approach to improve the accuracy of the Doppler estimates with the 4th order Autoregressive (AR) modelling of the inertial sensor random errors, which is studied for ultra-tight GPS/INS integration navigation . The ultra-tight integration is also known as deep integration, and using the structure of ultra-tight in the receiver has many advantages, such as disturbance rejection and multi-path rejection, promoting high dynamic performance, tracking weak signals, improving the accuracy, urban or indoor positioning capability, shorten acquisition time, improved phase locked loop bandwidth, achieve a more accurate Doppler frequency shift and measurement of phase, etc. Nevertheless, the tracking performance was still a concern in complex environments such as dynamic scenarios, indoor environments, urban areas, under foliages etc., where the GPS tracking loops lose lock due to the signals being weak, subjected to excessive dynamics or completely blocked. INS has two types of error sources: deterministic and stochastic. The navigation parameters, position, velocity and attitude are usually modelled as deterministic errors, whereas the residual biases from the sensors are modelled as stochastic errors. In this paper , the popular stochastic techniques–AR was investigated to model the Doppler signal , and calculate the Doppler frequency shift, which can be feedback to GPS tracking loops. The motivation of this research , was to eliminate the effect of stochastic error by Doppler with an integrated GPS/INS system using ultra-tight integration architecture.
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Books on the topic "Ultra-tight"

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Weitzman, Martin L. A Tight Connection Among Wealth, Income, Sustainability, and Accounting in an Ultra-Simplified Setting. Oxford University Press, 2017. http://dx.doi.org/10.1093/oso/9780198803720.003.0003.

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In theory, and under some very strong assumptions, there exists a tight quantitative relationship among the following four fundamental economic concepts: (1) ‘wealth’; (2) ‘income’; (3) ‘sustainability’; (4) ‘accounting’. These four basic concepts are placed in quotation marks here because a necessary first step will be to carefully and rigorously define what exactly is meant by each. This chapter reviews what is known about this important fourfold quantitative relationship in an ultra-simplified setting. It identifies some basic applications of this simplified economic theory of wealth and income (and sustainability and accounting). While the contents of this chapter are expressed at a very high level of abstraction and require many restrictive assumptions, the fundamental fourfold relationship it sharply highlights should be useful for conceptualizing, at least in principle, what is ‘wealth’ and what is its theoretical relationship to ‘income’, ‘sustainability’, and ‘accounting’.
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Book chapters on the topic "Ultra-tight"

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Xie, Yuchen, Pengcheng Ma, Zukun Lu, Feiqiang Chen, and Feixue Wang. "A Software Defined Receiver for GNSS/INS Ultra-Tight Coupling Simulation." In China Satellite Navigation Conference (CSNC) 2020 Proceedings: Volume III, 550–61. Singapore: Springer Singapore, 2020. http://dx.doi.org/10.1007/978-981-15-3715-8_49.

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Ren, Jianxin, Junlin Zi, and Jin Li. "A High-Precision Scheme for MINS/GPS Ultra-Tight Integration System." In Lecture Notes in Electrical Engineering, 4237–50. Singapore: Springer Singapore, 2021. http://dx.doi.org/10.1007/978-981-15-8155-7_352.

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Yang, Zhanwei, Yun Xu, Bo Cai, Liwei Wang, and Liao Wang. "Reducing Fracturing Pressure by Using Novel Stimulating Technique for Ultra-tight Rock." In Information Technology in Geo-Engineering, 460–67. Cham: Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-32029-4_40.

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Feng, Geng. "Research on Ultra-Tight Integration Technology for GNSS/SINS Integrated Navigation Systems." In China Satellite Navigation Conference (CSNC) 2014 Proceedings: Volume III, 533–48. Berlin, Heidelberg: Springer Berlin Heidelberg, 2014. http://dx.doi.org/10.1007/978-3-642-54740-9_47.

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Wang, Xiaoliang, Deren Gong, Yanguang Wang, Bo Qu, Longlong Li, Xingyuan Han, and Yansong Meng. "Test Results of HiSGR: A Novel GNSS/INS Ultra Tight Coupled Spaceborne Receiver." In Lecture Notes in Electrical Engineering, 285–95. Singapore: Springer Singapore, 2017. http://dx.doi.org/10.1007/978-981-10-4591-2_23.

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Li, Wei, Jiahe Xia, and Guoda Cheng. "An Improved Vector Tracking Loop of Ultra-Tight Integration for Carrier Phase Tracking." In Lecture Notes in Electrical Engineering, 475–84. Singapore: Springer Singapore, 2017. http://dx.doi.org/10.1007/978-981-10-4591-2_38.

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Luo, Ruilan, and Yongzhong Zhang. "Geological Characteristics and Production Performance of Ultra-Deep Naturally Fractured Tight Sandstone Gas Reservoirs." In Proceedings of the International Field Exploration and Development Conference 2018, 959–72. Singapore: Springer Singapore, 2019. http://dx.doi.org/10.1007/978-981-13-7127-1_89.

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Ji, Zhen, Chuanjun Li, and Xingcheng Li. "The Design of Simulation System of GPS/INS Ultra-tight Integration under High Dynamic Environment." In AsiaSim 2012, 258–64. Berlin, Heidelberg: Springer Berlin Heidelberg, 2012. http://dx.doi.org/10.1007/978-3-642-34390-2_30.

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Wang, Liao, Jun Li, Zhan-wei Yang, Ming-guang Che, and Guo-wei Xu. "Analysis of Stimulation Effect and Optimization of Stimulation Mode for Ultra-deep Tight Gas Reservoir." In Springer Series in Geomechanics and Geoengineering, 361–69. Singapore: Springer Singapore, 2020. http://dx.doi.org/10.1007/978-981-15-2485-1_34.

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Rodríguez, F. J., A. Camacho, and L. Quiroga. "A Tight-Binding Study of Interface States in Ultra-Thin Quantum Wells of HgTe in CdTe." In Springer Proceedings in Physics, 423–28. Berlin, Heidelberg: Springer Berlin Heidelberg, 1992. http://dx.doi.org/10.1007/978-3-642-76376-2_63.

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Conference papers on the topic "Ultra-tight"

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Ros, Eduardo, Javier D�az, Pablo Mar�n, and Andr�s Rojo. "Ultra Tight Relative Timing in Finance Trading." In 48th Annual Precise Time and Time Interval Systems and Applications Meeting. Institute of Navigation, 2017. http://dx.doi.org/10.33012/2017.15014.

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Mews, Kim S., Mustafa M. Alhubail, and Reza Gh Barati. "A REVIEW OF BRITTLENESS INDEX CORRELATIONS FOR UNCONVENTIONAL TIGHT AND ULTRA-TIGHT RESERVOIRS." In Joint 53rd Annual South-Central/53rd North-Central/71st Rocky Mtn GSA Section Meeting - 2019. Geological Society of America, 2019. http://dx.doi.org/10.1130/abs/2019sc-326962.

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Xu, Han. "Performance analysis and model for ultra-tight coupling." In Sixth International Conference on Electronics and Information Engineering, edited by Qiang Zhang. SPIE, 2015. http://dx.doi.org/10.1117/12.2202339.

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Fernandez-Prades, C., P. Closas, and J. Vila-Valls. "Nonlinear Filtering for Ultra-Tight GNSS/INS Integration." In ICC 2010 - 2010 IEEE International Conference on Communications. IEEE, 2010. http://dx.doi.org/10.1109/icc.2010.5502037.

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Narayan, S. P., Z. Yang, S. S. Rahman, and Z. Jing. "Propant Free-Shear Dilation: An Emerging Techology for Exploiting Tight to Ultra-Tight Gas Resources." In SPE Annual Technical Conference and Exhibition. Society of Petroleum Engineers, 1998. http://dx.doi.org/10.2118/49251-ms.

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Barati, Reza. "Nanoparticles as Fluid Loss Control Additives for Hydraulic Fracturing of Tight and Ultra-Tight Hydrocarbon-Bearing Formations." In ASME 2014 33rd International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/omae2014-23279.

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Injection of polymeric solutions, either as slick water or cross-linked fluids, in order to propagate a fracture and distribute proppants and keep the fracture open is a common practice in hydraulic fracturing of unconventional tight and ultra-tight formations. In addition to propagation of a main fracture, polymeric fluids will be invading the already existing network of micro-fractures and extending the network connected to the main fracture. Fluid loss into the matrix rock and micro-fractures is inevitable, so is the use of a comparable fluid loss additive to reduce the filtrate volume. Different classes of nanoparticles have been used by several researchers to carry different agents including surfactants and enzymes for hydraulic fracturing purposes. Nano-sized pores and micro-sized fractures in tight and ultra-tight formations require a nano to micro-sized fluid loss additive to improve propagation of the hydraulic fractures by efficiently reducing the fluid loss. In this study, application of silica and polyelectrolyte complex (PEC) nanoparticles as fluid loss additives for three sets of core plugs with permeability values within the 10−5 −10−4 mD, 0.01–0.1 mD and 1–40 mD range was investigated. The nano-sized material used in this study significantly reduced the fluid loss volume for the cores with permeability values below 0.1 mD when mixed only with 2% KCl or with low concentrations of guar polymer prepared in 2% KCl. Combination of the fluid loss additive application with chemical carrying application makes these nanoparticle systems a suitable package for hydraulic fracturing of tight and ultra-tight formations.
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Chakraborty, Nirjhor, and Zuleima T. Karpyn. "Gas Permeability Evolution with Soaking Time in Ultra Tight Shales." In SPE Annual Technical Conference and Exhibition. Society of Petroleum Engineers, 2015. http://dx.doi.org/10.2118/178740-stu.

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Wang, D., and J. Zhang. "Surfactant Drive Process in Ultra-Tight Fractured Reservoirs for EOR." In 80th EAGE Conference and Exhibition 2018. Netherlands: EAGE Publications BV, 2018. http://dx.doi.org/10.3997/2214-4609.201801113.

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Mu, Yajie, Xinyi Wang, Mingliang Huang, and Chao Ni. "Ultra-wideband 1bit reconfigurable reflectarray based on tight coupling method." In 2021 13th International Symposium on Antennas, Propagation and EM Theory (ISAPE). IEEE, 2021. http://dx.doi.org/10.1109/isape54070.2021.9753440.

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Babu, Ravindra, Jinling Wang, and Gottapu Rao. "Analysis of Ultra-tight GPS/INS Integrated System for Navigation Performance." In 2008 International Conference on Signal Processing, Communications and Networking. IEEE, 2008. http://dx.doi.org/10.1109/icscn.2008.4447195.

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