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Academic literature on the topic 'Tunnel technology'

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

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Journal articles on the topic "Tunnel technology"

1

Zhu, Jianguo, Yanyan Dong, Jiancheng Zhang, Feng Guo, Quanli Lu, Bin Lv, and Jianqing Wu. "Review on Tunnel Communication Technology." Sustainability 14, no. 18 (September 13, 2022): 11451. http://dx.doi.org/10.3390/su141811451.

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Tunnels account for an increasing proportion of highways. Due to the semi-closed structure of tunnels, signal communication is difficult in tunnels. This review analyzes the signal data transmission requirements of intelligent network management systems, such as lighting systems, wind protection systems, fire protection systems, and vehicle and pedestrian positioning systems in tunnels. The selection of signal coverage and transmission methods are also discussed. The advantages and disadvantages of various networking methods are analyzed. This paper summarizes the wireless signal transmission, wired signal transmission and signal transmission modes of different tunnel types.
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Qi, Su, Ye Zhang, Shu Hao Liu, and Nian Liu. "Construction Technology of Cangyuan Tunnel of LanYu Railway." Applied Mechanics and Materials 256-259 (December 2012): 1291–95. http://dx.doi.org/10.4028/www.scientific.net/amm.256-259.1291.

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The phenomenon of railway and road tunnel passing through the debris flow gully is more and more prevalent, for the rapid development of the construction of railways and highways. At present, the construction experience of tunnels passing through the debris flow gully is not rich enough, so the study on this part is necessary. The engineering geological conditions of Cangyuan Tunnel are complex and the construction of which is difficult. The three-step seven-step method, tunnel surface grouting and tunnel root piles reinforcement basis are used to ensure the stability of the tunnel surrounding rock, based on the characteristics of Cangyuan Tunnel which passes through the debris flow gully. The deformation is controlled within the specification range, which indicates that the construction effect of Cangyuan Tunnel is good. These construction measures solve the construction problems of tunnels which pass through the debris flow gully and ensure project quality and duration, therefore, these construction measures can be used in similar projects.
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Sun, Ya Ting, Zhi Rong Mei, and Jun Wei Zhang. "Continuous Belt Mucking Technology of China Railway Tunnel Construction." Applied Mechanics and Materials 268-270 (December 2012): 664–72. http://dx.doi.org/10.4028/www.scientific.net/amm.268-270.664.

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The conventional mucking system of tunnel construction in China has a series of deficiencies and stubborn problems. Tunnel mucking technologies matched with different tunnel construction methods have been analyzed systematically and the continuous belt mucking methodology which is appropriated with drilling-blasting method was presented. The continuous belt mucking technology includes mucking scheme design and mucking equipment configuration. Compared with the conventional mucking methods, the comprehensive benefit can be fully demonstrated by the new continuous belt mucking system. On the other hand, the predominance on environmental protection of the continuous belt mucking technoloty matches up with the conservation policy. The technology would be widely applied in long tunnels and tunnels embedded in frozen ground and located in bitter cold plateau. The economic benifis and contribution to society of continuous belt mucking technology would be remarkable.
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Wu, Sheng Lin, Hong Liang Deng, Kai Jiang Chen, Ming Yan Zhu, Dong Hui Huang, and Si Yuan Fu. "Visual Monitoring Technology of the Tunnel 3D Laser Scanning and Engineering Applications." Advanced Materials Research 779-780 (September 2013): 463–68. http://dx.doi.org/10.4028/www.scientific.net/amr.779-780.463.

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Tunnel monitoring and measurement is a very important part of the tunnel construction safety andit is one of the important contents of tunnels on Railway Passenger Dedicated Lines segment acceptance, Its purpose is through the tunnel clearance convergence and settlement observation,to analysis data, optimize tunnel construction and design, and determine a reasonable safety step and support time, protect tunnel construction and operational safety, Although the domestic and foreign on tunnel monitoring measurement work are very seriously, but at present the requirements of monitoring level and information construction are far away. This article based on 3D laser scanning technology, proposed tunnel 3D laser scanning measurement and data visualization technology, through the engineering application and practice, the results show that the technique can be real-time, accurate and comprehensive to get the deformation data of tunnel space,and can analysis and counter-analysis the deformation of tunnel construction, it has greatapplication value of engineering for early warning forecast the risk and guidingtunnel construction.
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Li, Xiao Juan, Fan He, Yu Bo Wang, Bin Zhang, and Xiao Bin Liang. "Tunnel Structure Safety Monitoring System Based on BOTDA Technology." Applied Mechanics and Materials 621 (August 2014): 281–84. http://dx.doi.org/10.4028/www.scientific.net/amm.621.281.

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The structure of the power tunnel is unique as a special place. It is built under the surface of the earth crust,belongs to half-hidden project. In recent years, affected by operating life, geological conditions, design and construction, the number of the tunnels which has structural safety risks apears more and more, so the safety of the tunnel structure always has been a very important issue of construction, operation and maintenance. This paper presents a tunnel structure safety monitoring system based on BOTDA technology.This system has good adaptability to the scene, and can remotely monitor the structural safety of the tunnel in real time, and it also has advantages of distribution, long-distance, high-precision, etc.
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Zhu, Huangda, Feng Liu, Jiawei Cui, and Wangbin Peng. "Research on tunnel damage process based on acoustic emission technology." Journal of Physics: Conference Series 2196, no. 1 (February 1, 2022): 012001. http://dx.doi.org/10.1088/1742-6596/2196/1/012001.

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Abstract For a long time, it is generally believed that the tunnel has excellent seismic performance and can resist earthquake damage, so it will not be damaged. However, according to the survey of tunnels after the Wenchuan earthquake in China, 110 tunnels were damaged to varying degrees. In this paper, a series of shaking table tests were carried out on the proportional tunnel model under seismic excitation. Acoustic emission technology is combined with seismic excitation to identify and describe the damage of tunnel lining. The tunnel lining strain and acoustic emission signals are collected in the test. In addition, this paper also introduces the use of acoustic emission technology to describe the damage of tunnel lining. Taking the crown as an example, through the correlation analysis of amplitude, counts and energy, it is preliminarily judged that the crown is damaged under working conditions 7 and 8; Then combined with strain analysis, it is proved that the correlation analysis is reasonable. Finally, the rationality of correlation analysis is further explained by the changes of counts, energy, and its cumulative parameters with time. At the same time, the damage process of tunnel lining under seismic excitation is described by defining damage variables, which can be divided into three stages: initial compression elastic stage, yield failure stage and residual stage.
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Zhang, Heng, Shou Gen Chen, and Liang Chen. "A Study on Large Power Jet Ventilation Technology in Long Tunnel Construction." Applied Mechanics and Materials 94-96 (September 2011): 1800–1804. http://dx.doi.org/10.4028/www.scientific.net/amm.94-96.1800.

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One of difficulties in super long tunnels’ construction is the construction ventilation to meet the requirement of normal construction environment and assure the workers’ health. Using traditional tunnelling ventilation is very difficult to meet the need of super long tunnel construction. As the energy assumption is high and it is very expensive. This paper investigated the simulation of tunnel construction ventilation with large power jet fans during the construction of Jinping Auxiliary Tunnels by using the computational fluid code FLUENT, the layout of jet fans in the tunnels is optimized. It is found that the best layout of the jet fan is aroud the transverse channel under the direction of airflow and jet fan should not be too far away from the transverse channel. The CO mainly distributes in the upper part of the tunnel when the jet fan is installed at a higher position, this layout of the jet fan is beneficial to construction of tunnels.
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Zhang, Yuling. "Application of Distributed Intelligent Power Supply Technology in Expressway Tunnels." Journal of World Architecture 6, no. 3 (May 17, 2022): 7–12. http://dx.doi.org/10.26689/jwa.v6i3.3889.

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With the coordinated development of today’s social economy with science and technology, various advanced technologies are being used in highway engineering, especially the distributed intelligent power supply technology in expressway tunnels, which has a very significant advantage. In order to realize the effective application of this technology and promote the power supply effect in expressway tunnel, this study analyzes the advantages of this technology and its application in expressway tunnel, hoping to provide scientific reference for the application of distributed intelligent power supply technology and the engineering development of expressway tunnels.
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Yang, Song, Zubin Ai, Chao Zhang, Shun Dong, Xun Ouyang, Rong Liu, and Ping Zhang. "Study on Optimization of Tunnel Ventilation Flow Field in Long Tunnel Based on CFD Computer Simulation Technology." Sustainability 14, no. 18 (September 13, 2022): 11486. http://dx.doi.org/10.3390/su141811486.

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With the rapid development of tunnel construction, more and more long tunnels are being designed and built. In contrast to ordinary tunnels, long tunnels are characterized by large construction distances and difficult ventilation. In this study, gallery ventilation systems in the construction of long tunnels were studied. Combined with the CFD software FLUENT, a three-dimensional model of tunnel ventilation of a double tunnel was established, and a numerical simulation analysis of the ventilation flow field was carried out and optimized the flow field of gallery ventilation. We found that the main circulation air flow of gallery ventilation was formed by the jet fan, which was installed near the air flow-in tunnel. We also determined the main factors that affect the ventilation effect in gallery ventilation, including the wind wall formed by the high-speed airflow at the cross-aisle and found that the draft fan in front of the cross-aisle could eliminate the wind wall and improve the ventilation effect. The influence of the location and type of the draft fan on the elimination of air flow structure was studied, and the best fan layout scheme suitable for the site was determined. The ventilation scheme of the tunnel was optimized.
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Pascu, Ileana, and Mircea Georgescu. "A Possible Tunnels Execution Technology on Subsection E2 of the Highway A1." Mining Revue 27, no. 3 (September 1, 2021): 45–63. http://dx.doi.org/10.2478/minrv-2021-0025.

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Abstract The paper aims to establish the design elements of the tunnels to be executed on subsection E2 of the Lugoj-Deva highway section, an integral part of the A1 highway. From the multitude of problems related to the execution of a tunnel, the paper investigates the following aspects: geotechnical investigations of the areas to be crossed by tunnels, analysis of tunnel stability, static checks of the final support/lining and, finally, a possible technology for their execution.
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Dissertations / Theses on the topic "Tunnel technology"

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Persson, Tobias. "Wind Tunnel Effects on Truck Aerodynamica and Soiling." Thesis, KTH, Mekanik, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-203972.

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Erlandsson, Olof. "Comparison of Tunnel Convergence Measurement Methods." Thesis, KTH, Fastigheter och byggande, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-276439.

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When creating cavities below ground, movements occur in the surrounding soil due to disrupted equilibrium. In tunnel constructions these displacements are referred to as tunnel convergence. This report compares four dierent methods for monitoring tunnel convergence with regards to both measurement precision and method cost. Three of the methods are based on displacement measurements of optical targets placed at regular intervals in the tunnel. Presented is also a method using a combination of wireless tilt and distance sensors to monitor tunnel convergence. The overall conclusion is that measurement precision and cost are well correlated. However, important to consider is that tunnel convergence monitoring cost is faceted and not only the obvious cost of equipment and labour, but also the indirect cost from interfering with other activities in the tunnel. Measurement precision of the dierent methods was determined by applying the methods in a lab environment, congured to eliminate any possible movements, and analysing the distribution of the displacement demonstrated by each method. In addition, information regarding the labour eort required to prepare and perform the measurements was also collected. Based on the experiments and literature studies, the report discusses the criteria to consider when selecting a tunnel convergence monitoring method and presents a comparison of the four methods included in the study.
Vid skapandet av underjordiska hålrum uppträder rörelser i den omgivande marken på grund av att jämvikten upphävs. I tunnelkonstruktioner kallas dessa förskjutningar för tunnelkonvergens. Denna rapport jämför, med avseende både på precision och kostnad, fyra metoder för mätning av tunnelkonvergens. Tre av metoderna baseras på förskjutningsmätningar av optiska mål placerade på regelbundna avstånd längs tunneln. Rapporten presenterar även en metod där en kombination av trådlösa tilt- och distanssensorer används för att monitorera tunnelkonvergens. Den övergripande slutsatsen är att mätprecision och kostnad är väl korrelerade. Viktigt är dock att beakta de olika delarna i den totala kostnaden, som inte bara består av kostnader för arbetskraft och utrustning utan även indirekta kostnader på grund av att annan verksamhet hindras under mätaktiviteter. Mätprecisionen för de olika metoderna uppskattades genom att analysera fördelningen av mätvärden uppmätta i en lab-miljö beskaffad så att inga rörelser förväntades. Från labmätningarna noterades även omfattningen av den arbetsinsats som krävs för att förbereda och utföra mätningarna. Med mätningarna och litteraturstudier som bakgrund diskuteras kriterier att beakta när man väler metod för konvergensmätning. Baserat på dessa kriterier jämförs de fyra metoderna.
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Inghels, Pieter. "Wind tunnel blockage corrections forwind turbine measurements." Thesis, KTH, Mekanik, 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-202632.

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Wind-tunnel measurements are an important step during the windturbinedesign process. The goal of wind-tunnel tests is to estimate theoperational performance of the wind turbine, for example by measuringthe power and thrust coecients. Depending on the sizes of both thewind turbine and the test section, the eect of blockage can be substantial.Correction schemes for the power and thrust coecients havebeen proposed in the literature, but for high blockage and highly loadedrotors these correction schemes become less accurate.A new method is proposed here to calculate the eect a cylindricalwind-tunnel test section has on the performance of the wind turbine.The wind turbine is modeled with a simplied vortex model. Usingvortices of constant circulation to model the wake vortices, the performancecharacteristics are estimated. The test section is modeled witha panel method, adapted for this specic situation. It uses irrotationalaxisymmetric source panels to enforce the solid-wall boundary condition.Combining both models in an iterative scheme allows for thesimulation of the eect of the presence of the test-section walls on windturbines performace.Based on the proposed wind-tunnel model, a more general empirical correlationscheme is proposed to estimate the performance characteristicsof a wind turbine operating under unconned conditions by correctingthe performance measured in the conned wind-tunnel conguration.The proposed correction scheme performs better than the existing correctionschemes, including cases with high blockage and highly loadedrotors.
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Lyu, Zhipeng. "Aerodynamic Wind Tunnel in Passenger Car Application." Thesis, KTH, Mekanik, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-203971.

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The thesis aims to provide an evaluation on the Volvo 1/5th scaled wind tunnel regarding its potentials and capabilities in aerodynamic study. The flow quality in the test section was evaluated. The experiments were performed included measurements of airspeed stability, tunnel-wall boundary layer profile and horizontal buoyancy. A numerical model was developed to predict the boundary layer thickness on the test floor. Repeatability tests were also conducted to establish the appropriate operating regime.A correlation study between the 1/5th scaled wind tunnel (MWT) and full scale wind tunnel (PVT) was performed using steady force and unsteady pressure measurements. The Volvo Aero 2020 concept car was selected to be the test model.The Reynolds effect and the tunnel-wall boundary layer interference were identified in the steady force measurements. Unsteady near-wake phenomena such as wake pumping and wake flapping were discussed in the unsteady base pressure measurements.
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DALLA, ROSA LEONARDO. "Structural Health of a concrete tunnel lining under complex in situ loading." Thesis, KTH, Bro- och stålbyggnad, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-255537.

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Supporting structures were designed for a utility tunnel in hard rock which was to be intersectedby some road tunnels. With the intersections involving partial overlapping between the idealcross-sections, a concrete lining and post-tensioned steel cables were added to support theutility tunnel prior to the excavation of the road tunnels. The objectives in this work wereto identify the structural behaviour of the system, assess the present state of the supportingstructures and suggest an effective monitoring strategy. Preliminary information was collectedfrom the original drawings, technical specifications as well as from site visits. Using on thefinite elements software Comsol Multiphysics, suitable models were built to represent thetunnel intersections and to test hypotheses. The significant uncertainties in the problem wereaddressed by studying limit cases and discussing their results. A measure of validation wasgained from comparing cracks in concrete on site with cracking hotspots predicted by themodel. It was concluded that the behaviour of the lining is not compatible with that of cablesuspended structures and that concrete is subject to relatively high state of stress. Monitoringcable forces was found to be an ineffective strategy for identifying changes in the structuralsystem. Monitoring the evolution of cracks in concrete was found to be the most feasiblestrategy.
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Domingo, Sabugo María. "Systematic errors in the characterization of rock mass quality for tunnels : a comparative analysis between core and tunnel mapping." Thesis, KTH, Jord- och bergmekanik, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-233126.

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This thesis analyzes the potential systematic errorin the characterization of the rock mass quality in borehole and tunnel mapping. The difference when assessing the rock mass quality refers to the fact that the characterization performed on drilled rock cores are commonly done on-meter length, while the tunnel section can be up to 20-25 m wide. At the same time, previous studies indicate that the engineering geologist tends to characterize the rock mass quality during tunnel excavation with a conservative estimation of the parameters defining the rock mass quality to ensure a sufficient rock support. In order to estimate this possible systematic error produced by the size difference when assessing the rock mass quality, a simulation was performed within a geological domain, representative of Stockholm city. In the simulation, each meter of the tunnel section was given a separate value of the rock mass quality, randomly chosen from a normal distribution representative for the studied geological domain. The minimum value was set to represent the characterized rock mass quality for that tunnel section. The results from the simulation produced a systematic error due to the difference between the geological domain, reproducing the borehole mapping, and the simulated values, representing the tunnel mapping. The results showed a systematic error in the RMR basic index around 15 points in average, which compared to the difference of 5-7 points obtained in Norrström and the Norrmalm tunnels in the Stockholm Citylink project recently constructed, are found to be excessive. However, in the simulation, it was assumed that (1) the results obtained were the same in the bore hole mapping and in the tunnel mapping, (2) with the only difference of the engineer geologist assigning to the tunnel section the lowest RMR basic value, and (3) that there was no spatial correlation between the quality RMR basic index. After analyzing the three assumptions the simulation was based upon, the absence of spatial correlation was found to be the most significative, which indicate that spatial correlation in rock mass quality needs to be included if a more correct value should be obtained.
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Li, Guijun, and 李桂君. "Development of recording technology with FePt recording media and magnetic tunnel junction sensors with conetic alloy." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2013. http://hub.hku.hk/bib/B50899776.

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With highly demanding requirement in current emerging cloud storage and personal computers, hard disk drive recording with high stability and high volume has attached much attention in industry and academy. Recording media and recording head feasible for future high-density recording are both crucial to utilize magnetic recording with 1T bit/in2 recording density. Recoding media with FePt for high density and high stability was investigated in this thesis using FePt polymers with imprinting methods and FePt thin films with ion-beam bombardment technologies. The FePt polymers can be patterned using imprint at micro-and nano-scales. The micro-and nano-patterns could be retained on substrates after sintering at high temperatures. The high magnetic coercivity was proved with line and dot patterns at different scales. Recording heads with Al2O3based magnetic tunneling junction sensors were also studied in thesis. The magnetic tunneling junction sensors were proved to work stable at different temperatures varying from -30oC to 100oC. The long time running test up to 100 hours also proved the stability of the magnetic tunneling junction sensors working in extreme temperatures. Withstate-of-art patterning and depositing technologies, new ideas about using FePt polymer to work as magnetic recording media and using ion beam bombardments to tune the FePt magnetic properties were verified. The feasibility of using Al2O3 based magnetic tunneling junction sensors as recording head was also discussed.
published_or_final_version
Electrical and Electronic Engineering
Doctoral
Doctor of Philosophy
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Taylor, Nigel John. "Adaptive wall technology for two-dimensional wind tunnel testing at high subsonic through to low supersonic speeds." Thesis, University of Southampton, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.294622.

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Sanches, José Afonso. "Understanding the dynamics of a tunnel oven : Use of infrared sensors to measure the temperature of the conveyor belt in a tunnel oven used in bread production." Thesis, Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-70363.

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During the continuous production of bread sometimes there are problems that lead to interruptions in the production and consequently to quality problems. One such problem is the bread burning in the contact area between the bread and the conveyor belt. In order to understand the problem and to know how to quantify it, it is necessary to understand what a thermodynamic system is and what types of systems exist, how the various types of heat transfer are processed, how to measure the temperature of an object by infrared radiation and some mathematical methods such as the least square root method. Temperature measurements were planned and carried out. The goal with the first experiment was to understand how the temperature of the conveyor belt varies during an interruption. All the other tests were done to investigate the effects of different solutions in the temperature variation of the belt. According to the results, the best solution is to turn off the oven during an interruption and the worst to spray the belt with water. To spray the belt with water may be a better solution than these results shows, but it is very affected by other problems, like depositions of limestone on the nozzles. A lot more solutions could be found but due to the time available, it was not possible to investigate all the variables/solutions in the process. A long-term  study would help understand much more within the regulation of the industrial baking process.
Under kontinuerlig produktion av bröd finns det ibland problem som leder till avbrott i produktionen och kvalitetsproblem. Ett sådant problem är att brödet blir bränt  i kontaktytan mellan brödet och transportbandet. För att förstå problemet och veta hur man kvantifierar detta,  är det nödvändigt att förstå vad ett termodynamiskt system är och vilka typer av system finns, hur olika typer av värmeöverföring sker, hur man mäter temperatur med hjälp av infraröd strålning och några matematiska metoder som minst kvadratrotsmetoden. Temperaturmätningar planerades och genomfördes. Målet med det första experimentet var att förstå hur transportbandets temperatur varierar under ett huppehåll. Alla andra tester utförades för att undersöka effekterna av de olika lösningarna i bandets temperaturvariation. Enligt resultaten är den bästa lösningen att stänga av ugnen under ett uppehåll och det värsta att spreya bältet med vatten. Att spreya bältet med vatten kan vara en bättre lösning än vad resultaten visar, men det påverkas mycket av andra problem, som avsättningar av kalksten på munstyckena. Många fler lösningar kunde hittas men det var inte möjligt att undersöka alla variabler / lösningar i processen på grund av tillgänglig tid. En långsiktig studie skulle hjälpa till att förstå mycket mer inom regleringen av industriell bakning.
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CONTRERAS, MORENO Jorge, and KIBRET DAWIT GHEBREIGZIABHER. "Aeration and risk mitigation for flood discharge tunnel in Zipingpu water conservancy project." Thesis, KTH, Betongbyggnad, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-275668.

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The importance of hydraulic structures has become an essential mitigating mean for floodsthat occur more often due to climate change. Thus, the importance and safety of flooddischarge tunnels has promoted further studies and experiments on the topic to mitigatedamages, such as cavitation that arise because of high speed flows.After an experimental study on a physical model was carried out on the flood discharge tunnelin Zipingpu Water Conservancy project, a CFD model was designed and simulated in thecommercial software ANSYS Fluent. The simulations aimed to evaluate and examine the riskfor cavitation in the tunnel, examine the design problems of the structure and analyse theinstalled aerators for the mitigation of cavitation. Moreover, using CFD models as acomplementary form to physical models was analyzed.A three dimensional geometry of the discharge tunnel was built in ANSYS Spaceclaim and themesh conducted with ANSYS mesh generator. The known boundary condition such as thedesign flow conditions, velocity inlet, pressure inlets and pressure outlet were set. For themodel a multiphase VOF scheme with RANS approach, k-ϵ turbulence model and a standardwall function was set.The results from the initial simulations showed that the discharge tunnel was under cavitationrisk, since the recorded cavitation index in the tunnel was below 1.8. After having revised thelayout of the aerators in order to mitigate cavitation risk, the results from the simulations withadded aerators were sufficient to mitigate the risk as the cavitation index was still below 1.8.The results for the cavitation index remained unchanged even in the simulated models with adifferent solver setup that were used in the comparison with the experimental data in order tovalidate them.As a conclusion, it was recommended that the tunnel design has to be revised and improvedby adding more aerators and air vents to mitigate the cavitation risk. Furthermore, more studieson the discharge tunnel or similar tunnels with similar conditions should be carried out in orderto validate the results of this study and determine if numerical models are preferable to physicalmodels
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Books on the topic "Tunnel technology"

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Chen, Jian, and Fanlu Min. Shield Tunnel Cutter Replacement Technology. Singapore: Springer Singapore, 2022. http://dx.doi.org/10.1007/978-981-16-4107-7.

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Britcher, Colin P. Applications of magnetic suspension technology to large scale facilities: Progress, problems and promises. [Washington, DC: National Aeronautics and Space Administration, 1997.

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Cao, Guohou, and Hao Liu. Three-Dimensional Exploration Technology of Tunnel Geology. Singapore: Springer Nature Singapore, 2023. http://dx.doi.org/10.1007/978-981-16-9225-3.

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Chen, Jian, Fanlu Min, and Shouhui Wang. Construction Technology of Large Diameter Underwater Shield Tunnel. Singapore: Springer Singapore, 2022. http://dx.doi.org/10.1007/978-981-16-5896-9.

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North Atlantic Treaty Organization. Advisory Group for Aerospace Research and Development. Special course on advances in cryogenic wind tunnel technology. Neuilly sur Seine, France: AGARD, 1989.

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Fluid Dynamics Panel Working Group 12 on adaptive wind tunnel walls: Technology & applications. Neuilly-sur-Seine: AGARD, 1990.

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Wolf, Stephen W. D. Supersonic wind tunnel nozzles: A selected, annotated bibliography to aid in the development of quiet wind tunnel technology. Washington, D.C: National Aeronautics and Space Administration, 1990.

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Japan) Fūdō Kenkyū Kaigi (66th 2001 Tokyo. Dai 66-kai Fūdō Kenkyū Kaigi ronbunshū: Proceedings of the Wind Tunnel Technology Association 66th meeting. Tōkyō-to Chōfu-shi: Uchū Kōkū Kenkyū Kaihatsu Kikō, 2004.

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Qixin, Yang, and Guo Chun, eds. Gao su gong lu sui dao ji sui dao qun fang zai jiu yuan ji shu: Highway tunnel disaster relief technology. Beijing Shi: Ren min jiao tong chu ban she, 2010.

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United States. Congress. House. Committee on Science, Space, and Technology. Subcommittee on Technology, Environment, and Aviation. Enhancing U.S. competitiveness: NASA hypersonics research and wind tunnel programs : hearing before the Subcommittee on Technology, Environment, and Aviation of the Committee on Science, Space, and Technology, U.S. House of Representatives, One Hundred Third Congress, second session, March 15, 1994. Washington: U.S. G.P.O., 1994.

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Book chapters on the topic "Tunnel technology"

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Feng, Guangliang, Qi Ma, Xun Zhang, Dingjun Qu, Guojun Wang, Jian Liu, and Zongjun Zhu. "Developments of Microseismic Monitoring Technology in Deep Tunnels in China." In Lecture Notes in Civil Engineering, 541–48. Singapore: Springer Singapore, 2022. http://dx.doi.org/10.1007/978-981-19-1260-3_50.

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AbstractWith the increasing demand for infrastructure construction as the global economy progresses, the need for exploration and utilization of deep underground space becomes more crucial. Microseismic (MS) monitoring technology has been widely used in deep underground tunnel projects for safety monitoring in China in recent years. In this paper, four aspects of MS monitoring technology developments, i.e. distribution of projects, environment and system characteristic, purpose, and effect of MS monitoring in deep tunnel projects in China were analyzed and summarized. The results show that the technology was mainly applied in the west of China with a wide range of project types. The maximum buried depth of the tunnels monitored reached 2525 m. The tunnel construction method was mainly drilling and blasting method. The lithologies of the tunnels were mainly marble, granite and basalt. The monitoring purpose was for disaster warning and mechanism understanding. In addition, the future development of MS monitoring technology in deep tunnels in China is prospected. The results will be helpful for a rapid development of MS monitoring technology in deep tunnels in China.
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Zhao, Min. "Advanced Wind Tunnel Measurement Technology." In Springer Aerospace Technology, 181–247. Singapore: Springer Singapore, 2021. http://dx.doi.org/10.1007/978-981-33-6526-1_7.

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Longo, Sandro G. "Applications in Wind Tunnel Technology." In Principles and Applications of Dimensional Analysis and Similarity, 311–27. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-79217-6_9.

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Li, Chun, Weibiao Chen, Rongfeng Deng, and Qi Han. "Overview of Tunnel Detection Technology." In Proceedings of IncoME-V & CEPE Net-2020, 81–90. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-75793-9_9.

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Maidl, Bernhard, Markus Thewes, and Ulrich Maidl. "New Measurement and Control Technology in Tunnelling." In Handbook of Tunnel Engineering II, 245–75. D-69451 Weinheim, Germany: Wiley-VCH Verlag GmbH, 2014. http://dx.doi.org/10.1002/9783433603536.ch6.

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Borghetti, Fabio, Paolo Cerean, Marco Derudi, and Alessio Frassoldati. "Egress Model of Tunnel Users." In SpringerBriefs in Applied Sciences and Technology, 69–80. Cham: Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-00569-6_8.

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Khanna, Vinod Kumar. "Tunnel Junction, Coulomb Blockade, and Quantum Dot Circuit." In NanoScience and Technology, 223–45. New Delhi: Springer India, 2016. http://dx.doi.org/10.1007/978-81-322-3625-2_13.

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Tarasov, M., and V. Edelman. "Nanodevices with Normal Metal—Insulator—Superconductor Tunnel Junctions." In NanoScience and Technology, 91–116. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-90481-8_5.

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König, Jürgen, Herbert Schoeller, Gerd Schön, and Andrei D. Zaikin. "Strong Electron Tunneling in Mesoscopic Tunnel Junctions." In Nanoscale Science and Technology, 107–26. Dordrecht: Springer Netherlands, 1998. http://dx.doi.org/10.1007/978-94-011-5024-8_10.

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Ong, Dominic Ek Leong, Marco Barla, Jason Wen-Chieh Cheng, Chung Siung Choo, Minmin Sun, and Mohammud Irfaan Peerun. "Decarbonizing Tunnel Design and Construction." In Sustainable Pipe Jacking Technology in the Urban Environment, 277–313. Singapore: Springer Singapore, 2022. http://dx.doi.org/10.1007/978-981-16-9372-4_8.

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Conference papers on the topic "Tunnel technology"

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Friedman, Kyle, and Melody Clay. "Technology Shaping Tunnel Rehabilitation." In Rocky Mountain Geo-Conference 2022. Reston, VA: American Society of Civil Engineers, 2022. http://dx.doi.org/10.1061/9780784484517.006.

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Chen, Dezhi, and Shunxiang Xu. "Tunnel Blasting Adjacent to Existing Tunnel and Its Safety Technology." In Second International Conference on Transportation Engineering. Reston, VA: American Society of Civil Engineers, 2009. http://dx.doi.org/10.1061/41039(345)618.

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Li, Hai, Yunjie Zhou, Bin Shen, Liyong Ling, Jun Xia, Tianyu Yang, Qing Lu, Yi Zhou, and Yudong Liu. "Research on Tunnel Wireless Communication Technology." In 2020 International Conference on Wireless Communications and Smart Grid (ICWCSG). IEEE, 2020. http://dx.doi.org/10.1109/icwcsg50807.2020.00024.

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Lou, Yafang. "Research and Implementation of Tunnel Technology." In 2017 5th International Conference on Machinery, Materials and Computing Technology (ICMMCT 2017). Paris, France: Atlantis Press, 2017. http://dx.doi.org/10.2991/icmmct-17.2017.208.

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Li Taobo, Zhang Yi, Yang Bo, and Chen Peng. "Research on power cable tunnel and urban utility tunnel." In 2017 EPTC Power Transmission and Transformation Technology Conference. Institution of Engineering and Technology, 2017. http://dx.doi.org/10.1049/cp.2017.0547.

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Guo, Chun, Mingnian Wang, and Lu Yang. "Intelligent Traffic Safety Control Technology of Highway Adjoining Tunnel and Tunnel Group." In Fourth International Conference on Transportation Engineering. Reston, VA: American Society of Civil Engineers, 2013. http://dx.doi.org/10.1061/9780784413159.283.

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Jianguo, Xu, Hou Yujie, and Huang Liang. "Tunnel Construction Safety Inspection and Polymer Grouting Technology for Tunnel Quick Maintenance." In 2010 International Conference on Optoelectronics and Image Processing (ICOIP). IEEE, 2010. http://dx.doi.org/10.1109/icoip.2010.140.

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Morita, Y., K. Fukuda, T. Mori, and T. Matsukawa. "Fabrication of epitaxial tunnel junction on tunnel field effect transistors." In 2019 19th International Workshop on Junction Technology (IWJT). IEEE, 2019. http://dx.doi.org/10.23919/iwjt.2019.8802892.

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Ma, T. P. "Advanced tunnel dielectrics for flash memory technology." In 2006 8th International Conference on Solid-State and Integrated Circuit Technology Proceedings. IEEE, 2006. http://dx.doi.org/10.1109/icsict.2006.306439.

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Krellmann, Y., G. Triltzsch, and Dr H. M. Braun. "Space Radar Technology for Mine-Tunnel Security." In 56th International Astronautical Congress of the International Astronautical Federation, the International Academy of Astronautics, and the International Institute of Space Law. Reston, Virigina: American Institute of Aeronautics and Astronautics, 2005. http://dx.doi.org/10.2514/6.iac-05-e5.4.03.

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Reports on the topic "Tunnel technology"

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Raber, E. Technology Summary L-21044 Tunnel Sensor Hydrogeology Evaluations. Office of Scientific and Technical Information (OSTI), March 2020. http://dx.doi.org/10.2172/1605062.

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S. W. Allendorf, B. W. Bellow, and R. f. Boehm. Contained rocket motor burn demonstrations in X-tunnel: Final report for the DoD/DOE Joint Demilitarization Technology Program. Office of Scientific and Technical Information (OSTI), May 2000. http://dx.doi.org/10.2172/755152.

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B. W. Bellow, A. E. Moeller, D. Steele, S. M. Williams, R. L. Heinle, C. O. Pruneda, C. A. Velsko, et al. Department of Defense/Department of Energy joint demilitarization technology demonstration program executive summary of Phase II demonstrations: The low-pressure rocket motor burns in X-Tunnel. Office of Scientific and Technical Information (OSTI), December 1999. http://dx.doi.org/10.2172/750891.

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Haselbacher, Andreas, Michel Arnal, Maurizio Barbato, Alexander Fuchs, Jared Garrison, Turhan Demiray, Philipp Jenny, et al. Verbundsynthese «Stromspeicherung über adiabatische Druckluftspeicherung» des NFP «Energie». Swiss National Science Foundation (SNSF), January 2020. http://dx.doi.org/10.46446/publikation_nfp70_nfp71.2020.3.de.

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Der Verzicht auf Kernkraftwerke und der Ausbau von Solar- und Windenergie führen dazu, dass die Stromproduktion volatiler wird. Damit Strom dann zur Verfügung steht, wenn er gebraucht wird, braucht es neue Speichersysteme. Eine vielversprechende Technologie ist die adiabatische Druckluftspeicherung. Sie nutzt überschüssigen Strom aus Solar- und Windanlagen, um Umgebungsluft zu komprimieren und diese in einem unterirdischen Hohlraum zu speichern. Bei Bedarf wird die komprimierte Luft wieder expandiert; sie treibt dabei eine Turbine an und erzeugt wieder Strom. Da die bei der Komprimierung entstandene Wärme genutzt wird, beträgt die Effizienz 65 bis 75 Prozent; das ist ein ähnlicher Wert wie jener, den Pumpspeicher erreichen. Auch die Umweltverträglichkeit von Druckluftspeichern ist, gemessen am Treibhausgaspotenzial und an Schäden an Ökosystemen, vergleichbar mit jener von Pumpspeichern. Druckluftspeicher sind technisch machbar. Wichtige Komponenten wie Turbomaschinen und Wärmespeicher sind entweder bereits auf dem Markt erhältlich oder wurden in einer Pilotanlage erprobt. Der Bau von Hohlräumen ist zudem durch die Erfahrungen im Tunnel- und Kavernenbau ausgereift. Adiabatische Druckluftspeicher sind also eine effiziente, umweltverträgliche und technisch machbare Speicherlösung. Wegen der hohen Kapitalkosten sowie der unklaren wirtschaftlichen und rechtlichen Rahmenbedingungen ist allerdings ungewiss, ob sie wirtschaftlich sein können. Dies erschwert auch die Finanzierung einer Demonstrationsanlage.
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Haselbacher, Andreas, Michel Arnal, Maurizio Barbato, Alexander Fuchs, Jared Garrison, Turhan Demiray, Philipp Jenny, et al. Joint synthesis “Electricity storage via adiabatic air compression” of the NRP “Energy”. Swiss National Science Foundation (SNSF), January 2020. http://dx.doi.org/10.46446/publication_nrp70_nrp71.2020.3.en.

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La fermeture des centrales nucléaires et le développement de l’énergie solaire et éolienne rendent la production d’électricité plus volatile. De nouveaux systèmes de stockage sont nécessaires pour s’assurer que l’électricité est disponible au moment où elle est nécessaire. Le stockage adiabatique d’air comprimé représente une technologie prometteuse. Il utilise l’excédent de production des installations solaires et éoliennes pour comprimer l’air ambiant et le stocker dans une cavité souterraine. Au besoin, l’air comprimé est à nouveau détendu et entraîne alors une turbine qui produit de l’électricité. En tirant profit de la chaleur générée lors de la compression, cette technologie atteint un rendement de 65 à 75 %, ce qui est semblable à celui obtenu avec l’accumulation par pompage. En termes de potentiel d’émission de gaz à effet de serre et de dommages aux écosystèmes, la compatibilité environnementale des réservoirs d’air comprimé est également comparable à celle des systèmes à accumulation par pompage. Les réservoirs d’air comprimé sont techniquement réalisables. Les composants importants, comme les turbomachines et les accumulateurs thermiques, sont déjà disponibles sur le marché ou ont été testés dans une installation pilote. La construction de cavités bénéficie de l’expérience acquise lors de la réalisation de tunnels et de cavernes. Les réservoirs adiabatiques d’air comprimé constituent par conséquent une solution de stockage efficace, écologique et techniquement réalisable. En raison de leurs coûts d’investissement élevés et du manque de clarté qui entoure leur cadre économique et juridique, leur rentabilité demeure toutefois incertaine. Cela complique également le financement d’une installation de démonstration.
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Haselbacher, Andreas, Michel Arnal, Maurizio Barbato, Alexander Fuchs, Jared Garrison, Turhan Demiray, Philipp Jenny, et al. Synthèse conjointe «Stockage d’électricité par compression adiabatique d’air» du PNR «Energie». Swiss National Science Foundation (SNSF), January 2020. http://dx.doi.org/10.46446/publication_pnr70_pnr71.2020.3.fr.

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La fermeture des centrales nucléaires et le développement de l’énergie solaire et éolienne rendent la production d’électricité plus volatile. De nouveaux systèmes de stockage sont nécessaires pour s’assurer que l’électricité est disponible au moment où elle est nécessaire. Le stockage adiabatique d’air comprimé représente une technologie prometteuse. Il utilise l’excédent de production des installations solaires et éoliennes pour comprimer l’air ambiant et le stocker dans une cavité souterraine. Au besoin, l’air comprimé est à nouveau détendu et entraîne alors une turbine qui produit de l’électricité. En tirant profit de la chaleur générée lors de la compression, cette technologie atteint un rendement de 65 à 75 %, ce qui est semblable à celui obtenu avec l’accumulation par pompage. En termes de potentiel d’émission de gaz à effet de serre et de dommages aux écosystèmes, la compatibilité environnementale des réservoirs d’air comprimé est également comparable à celle des systèmes à accumulation par pompage. Les réservoirs d’air comprimé sont techniquement réalisables. Les composants importants, comme les turbomachines et les accumulateurs thermiques, sont déjà disponibles sur le marché ou ont été testés dans une installation pilote. La construction de cavités bénéficie de l’expérience acquise lors de la réalisation de tunnels et de cavernes. Les réservoirs adiabatiques d’air comprimé constituent par conséquent une solution de stockage efficace, écologique et techniquement réalisable. En raison de leurs coûts d’investissement élevés et du manque de clarté qui entoure leur cadre économique et juridique, leur rentabilité demeure toutefois incertaine. Cela complique également le financement d’une installation de démonstration.
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Fromm, Hillel, Paul Michael Hasegawa, and Aaron Fait. Calcium-regulated Transcription Factors Mediating Carbon Metabolism in Response to Drought. United States Department of Agriculture, June 2013. http://dx.doi.org/10.32747/2013.7699847.bard.

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Original objectives: The long-term goal of the proposed research is to elucidate the transcription factors, genes and metabolic networks involved in carbon metabolism and partitioning in response to water deficit. The proposed research focuses on the GTLcalcium/calmodulinbindingTFs and the gene and metabolic networks modulated by these TFs in Arabidopsis thaliana. The specific objectives are as follows. Objective-1 (USA): Physiological analyses of GTL1 loss- and gain-of-function plants under water sufficient and drought stress conditions Objective 2 (USA / Israel-TAU): Characterizion of GTL target genes and bioinformatic analysis of data to eulcidate gene-network topology. Objective-3 (Israel-TAU): Regulation of GTLmediated transcription by Ca²⁺/calmodulin: mechanism and biological significance. Objective-4 (Israel-BGU): Metabolic networks and carbon partitioning in response to drought. Additional direction: In the course of the project we added another direction, which was reported in the 2nd annual report, to elucidate genes controlling drought avoidance. The TAU team has isolated a few unhydrotropic (hyd) mutants and are in the process of mapping these mutations (of hyd13 and hyd15; see last year's report for a description of these mutants under salt stress) in the Arabidopsis genome by map-based cloning and deep sequencing. For this purpose, each hyd mutant was crossed with a wild type plant of the Landsberg ecotype, and at the F2 stage, 500-700 seedlings showing the unhydrotropic phenotype were collected separately and pooled DNA samples were subkected to the Illumina deep sequencing technology. Bioinformatics were used to identify the exact genomic positions of the mutations (based on a comparison of the genomic sequences of the two Arabidopsis thaliana ecotypes (Columbia and Landsberg). Background: To feed the 9 billion people or more, expected to live on Earth by the mid 21st century, the production of high-quality food must increase substantially. Based on a 2009 Declaration of the World Summit on Food Security, a target of 70% more global food production by the year 2050 was marked, an unprecedented food-production growth rate. Importantly, due to the larger areas of low-yielding land globally, low-yielding environments offer the greatest opportunity for substantial increases in global food production. Nowadays, 70% of the global available water is used by agriculture, and 40% of the world food is produced from irrigated soils. Therefore, much needs to be done towards improving the efficiency of water use by plants, accompanied by increased crop yield production under water-limiting conditions. Major conclusions, solutions and achievements: We established that AtGTL1 (Arabidopsis thaliana GT-2 LIKE1) is a focal determinant in water deficit (drought) signaling and tolerance, and water use efficiency (WUE). The GTL1 transcription factor is an upstream regulator of stomatal development as a transrepressor of AtSDD1, which encodes a subtilisin protease that activates a MAP kinase pathway that negatively regulates stomatal lineage and density. GTL1 binds to the core GT3 cis-element in the SDD1 promoter and transrepresses its expression under water-sufficient conditions. GTL1 loss-of-function mutants have reduced stomatal number and transpiration, and enhanced drought tolerance and WUE. In this case, higher WUE under water sufficient conditions occurs without reduction in absolute biomass accumulation or carbon assimilation, indicating that gtl1-mediated effects on stomatal conductance and transpiration do not substantially affect CO₂ uptake. These results are proof-of-concept that fine-tuned regulation of stomatal density can result in drought tolerance and higher WUE with maintenance of yield stability. Implications: Accomplishments during the IS-4243-09R project provide unique tools for continued discovery research to enhance plant drought tolerance and WUE.
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