Bibliografias temáticas / TWRP

Literatura científica selecionada sobre o tema "TWRP"

Autor: Grafiati
Publicado: 23 de junho de 2021
Última modificação: 2 de fevereiro de 2022

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Artigos de revistas sobre o assunto "TWRP":

1

Fellman, Johan. "Twinning Rates in Isolates". Twin Research and Human Genetics 19, n.º 6 (27 de setembro de 2016): 673–78. http://dx.doi.org/10.1017/thg.2016.77.

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The aim of this study was to investigate the twinning rates (TWRs) in isolates relative to the TWRs in the surrounding populations. It is not uncommon that the TWR shows extreme values (high or low rates) within isolated subpopulations. Starting from the isolated populations of the Åland Islands in Finland (high rates), we enlarged our studies to other isolated subpopulations in other countries: the island of Gotland (high rates), the county of Älvsborg located in the southwestern part of Sweden (low rates), and mountain villages in Norway. In our statistical analyses, we paid special attention to the robustness of the variance formula of the TWR and to alternative confidence intervals for the TWR. Particularly, we show how to obtain the most precise confidence intervals for the twinning rates. These statistical methods are crucial when the extreme TWRs within subpopulations are compared with the TWRs within the general population. One must decide whether the differences are real or caused by random fluctuations within the small isolates.
2

Fellman, Johan. "Temporal and Spatial Variations in the Twinning Rate in Norway". Twin Research and Human Genetics 19, n.º 4 (24 de junho de 2016): 359–66. http://dx.doi.org/10.1017/thg.2016.49.

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Strong geographical variations have been noted in the twinning rate (TWR). In general, the rate is high among people of African origin, intermediate among Europeans, and low among most Asiatic populations. In Europe, there tends to be a south–north cline, with a progressive increase in the TWR from south to north and a minimum around the Basque provinces. The highest TWRs in Europe have been found among the Nordic populations. Furthermore, within larger populations, small isolated subpopulations have been identified to have extreme, mainly high, TWRs. In the study of the temporal variation of the TWR in Norway, we consider the period from 1900 to 2014. The regional variation of the TWR in Norway is analyzed for the different counties for two periods, 1916–1926 and 1960–1988. Heterogeneity between the regional TWRs in Norway during 1916–1926 was found, but the goodness of fit for the alternative spatial models was only slight. The optimal regression model for the TWR in Norway has the longitude and its square as regressors. According to this model, the spatial variation is distributed in a west–east direction. For 1960–1988, no significant regional variation was observed. One may expect that the environmental and genetic differences between the counties in Norway have disappeared and that the regional TWRs have converged towards a common low level.
3

Kim, Jang Hun, Huan Han, Young-June Moon, Sangil Suh, Taek-Hyun Kwon, Jong Hyun Kim, Kyuha Chong e Won-Ki Yoon. "Hemodynamic Features of Microsurgically Identified, Thin-Walled Regions of Unruptured Middle Cerebral Artery Aneurysms Characterized Using Computational Fluid Dynamics". Neurosurgery 86, n.º 6 (21 de agosto de 2019): 851–59. http://dx.doi.org/10.1093/neuros/nyz311.

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Abstract BACKGROUND Thin-walled regions (TWRs) of aneurysm surfaces observed in microscopic surgery are thought to be vulnerable areas for growth and rupture of unruptured intracranial aneurysms (UIAs). OBJECTIVE To identify hemodynamic features of TWRs of aneurysms by using computational fluid dynamics (CFD) analyses of unruptured middle cerebral artery bifurcation (MCAB) aneurysms. METHODS Nine patients with 11 MCAB aneurysms were enrolled, and their TWRs were identified. CFD analysis was performed using 3 parameters: pressure, wall shear stress (WSS), and WSS divergence (WSSD). Each parameter was evaluated for its correspondence with TWR. RESULTS Among 11 aneurysms, 15 TWRs were identified. Corresponding matches with CFD parameters (pressure, WSS, and WSSD) were 73.33, 46.67, and 86.67%, respectively. CONCLUSION WSSD, a hemodynamic parameter that accounts for both magnitude and directionality of WSS, showed the highest correspondence. High WSSD might correspond with TWR of intracranial aneurysms, which are likely high-risk areas for rupture.
4

HE, XU, ZHU TAN e DAI SHUGUI. "STRATEGIC ENVIRONMENTAL ASSESSMENT (SEA) OF WASTEWATER REUSE POLICY: A CASE STUDY FROM TIANJIN IN CHINA". Journal of Environmental Assessment Policy and Management 05, n.º 04 (dezembro de 2003): 503–21. http://dx.doi.org/10.1142/s1464333203001504.

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China is one of the thirteen countries in the world that lacks water. Rapid economic growth and urbanisation over the past two decades have exerted enormous pressure on China's water resources. The shortage of water resources and serious water pollution have become important factors restraining the sustainable development in the cities. Wastewater reuse has been proven to prevent water pollution and ameliorate the pressure on the water environment. Moreover, wastewater reuse can make up for the lack of funds in wastewater treatment. So, wastewater reuse is a viable choice to realise the sustainable utilisation of water resource in China. There still remain many uncertainties in wastewater reuse. It is strongly recommended that a wastewater reuse policy be pushed forward considering the necessity and the implications to society, the economy and the environment. Strategic environmental assessment (SEA) is seen as an important tool for integrating the environmental factors into decision-making. This paper illustrates a case study for SEA — aimed at Tianjin Wastewater Reuse Policy (TWRP). The process of SEA at the policy level and the related problems are presented within this case study. It provides a good framework for carrying out SEA of waste reuse at the national level. The study will support the Chinese Government in developing a national strategy on urban wastewater reuse through an investigation of the existing situations, evaluation of policy options in different areas, and offering recommendations.
5

Suzuki, Tomoaki, Hiroyuki Takao, Takashi Suzuki, Yukinao Kambayashi, Mitsuyoshi Watanabe, Hiroki Sakamoto, Issei Kan et al. "Determining the Presence of Thin-Walled Regions at High-Pressure Areas in Unruptured Cerebral Aneurysms by Using Computational Fluid Dynamics". Neurosurgery 79, n.º 4 (1 de outubro de 2016): 589–95. http://dx.doi.org/10.1227/neu.0000000000001232.

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Abstract BACKGROUND Thin-walled regions (TWRs) of cerebral aneurysms are at high risk of rupture, and careful attention should be paid during surgical procedures. Despite this, an optimal imaging technique to estimate TWRs has not been established. Previously, pressure elevation at TWRs was reported with computational fluid dynamics (CFD) but not fully evaluated. OBJECTIVE To investigate the possibility of predicting aneurysmal TWRs at high-pressure areas with CFD. METHODS Fifty unruptured middle cerebral artery aneurysms were analyzed. Spatial and temporal maximum pressure (Pmax) areas were determined with a fluid-flow formula under pulsatile blood flow conditions. Intraoperatively, TWRs of aneurysm domes were identified as reddish areas relative to the healthy normal middle cerebral arteries; 5 neurosurgeons evaluated and divided these regions according to Pmax area and TWR correspondence. Pressure difference (PD) was defined as the degree of pressure elevation on the aneurysmal wall at Pmax and was calculated by subtracting the average pressure from the Pmax and dividing by the dynamic pressure at the aneurysm inlet side for normalization. RESULTS In 41 of the 50 cases (82.0%), the Pmax areas and TWRs corresponded. PD values were significantly higher in the correspondence group than in the noncorrespondence group (P = .008). A receiver-operating characteristic curve demonstrated that PD accurately predicted TWRs at Pmax areas (area under the curve, 0.764; 95% confidence interval, 0.574-0.955; cutoff value, 0.607; sensitivity, 66.7%; specificity, 82.9%). CONCLUSION A high PD may be a key parameter for predicting TWRs in unruptured cerebral aneurysms.
6

Wu, Renguang, Yuqi Wang e Xi Cao. "What Modulates the Intensity of Synoptic-Scale Variability over the Western North Pacific during Boreal Summer and Fall?" Journal of Climate 34, n.º 9 (maio de 2021): 3645–62. http://dx.doi.org/10.1175/jcli-d-20-0477.1.

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AbstractThe present study investigates the factors that affect the year-to-year change in the intensity of synoptic-scale variability (SSV) over the tropical western North Pacific (TWNP) during boreal summer and fall. It is found that the intensity of the TWNP SSV in summer is associated with the equatorial central-eastern Pacific sea surface temperature (SST) anomalies that modulate the background fields through a Rossby wave response both in the source region and along the propagation path of the synoptic-scale disturbances. In fall, the intensity of the TWNP SSV is related to an SST anomaly pattern with opposite anomalies in the equatorial central Pacific and TWNP that modulates the background fields from the equatorial central Pacific to TWNP. However, the equatorial central Pacific SST anomalies alone fail to change the intensity of the TWNP SSV as the induced background field changes are limited to the equatorial central Pacific. It is shown that tropical western Pacific SST anomalies may induce notable changes in the intensity of the TWNP SSV. The relation of the TWNP SSV to the equatorial eastern Pacific SST is weak due to opposite SST anomalies in different types of years. Both seasonal mean and intraseasonal flows provide sources of barotropic energy for the change in the intensity of the TWNP synoptic-scale disturbances in summer. Seasonal mean flow has a main contribution to the barotropic energy conversion for the change in the intensity of the TWNP synoptic-scale disturbances in fall.
7

Bastidas, David M., Jacob Ress, Juan Bosch e Ulises Martin. "Corrosion Mechanisms of High-Mn Twinning-Induced Plasticity (TWIP) Steels: A Critical Review". Metals 11, n.º 2 (7 de fevereiro de 2021): 287. http://dx.doi.org/10.3390/met11020287.

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Twinning-induced plasticity (TWIP) steels have higher strength and ductility than conventional steels. Deformation mechanisms producing twins that prevent gliding and stacking of dislocations cause a higher ductility than that of steel grades with the same strength. TWIP steels are considered to be within the new generation of advanced high-strength steels (AHSS). However, some aspects, such as the corrosion resistance and performance in service of TWIP steel materials, need more research. Application of TWIP steels in the automotive industry requires a proper investigation of corrosion behavior and corrosion mechanisms, which would indicate the optimum degree of protection and the possible decrease in costs. In general, Fe−Mn-based TWIP steel alloys can passivate in oxidizing acid, neutral, and basic solutions, however they cannot passivate in reducing acid or active chloride solutions. TWIP steels have become as a potential material of interest for automotive applications due to their effectiveness, impact resistance, and negligible harm to the environment. The mechanical and corrosion performance of TWIP steels is subjected to the manufacturing and processing steps, like forging and casting, elemental composition, and thermo-mechanical treatment. Corrosion of TWIP steels caused by both intrinsic and extrinsic factors has posed a serious problem for their use. Passivity breakdown caused by pitting, and galvanic corrosion due to phase segregation are widely described and their critical mechanisms examined. Numerous studies have been performed to study corrosion behavior and passivation of TWIP steel. Despite the large number of articles on corrosion, few comprehensive reports have been published on this topic. The current trend for development of corrosion resistance TWIP steel is thoroughly studied and represented, showing the key mechanisms and factors influencing corrosion processes, and its consequences on TWIP steel. In addition, suggestions for future works and gaps in the literature are considered.
8

Yan, Wanzi, Junhui Wang, Jingyi Cheng, Zhijun Wan, Keke Xing e Kuidong Gao. "Long Short-Term Memory Networks and Bayesian Optimization for Predicting the Time-Weighted Average Pressure of Shield Supporting Cycles". Geofluids 2021 (27 de março de 2021): 1–14. http://dx.doi.org/10.1155/2021/8895844.

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Characteristic parameters of shield supporting in fully mechanized mining, especially time-weighted average pressure (TWAP), are crucial for the analysis and prediction of roof weightings in longwall panels. Despite the leap-forward development of underground data collection and transmission, mining and regional correlation analysis of massive shield data remains challenging. In this study, a hybrid machine learning model integrating the long short-term memory (LSTM) networks and the Bayesian optimization (BO) algorithm was developed to predict TWAP based on the setting pressure (SP), revised setting pressure (RSP), final pressure (FP), number of yielding (NY), TWAP in the last supporting cycle (TWAP (last)), and loading rate in each period. Statistical measures including the mean square error and mean absolute error were used to validate and compare the prediction performances of the BP model, the LSTM model, and the BO-LSTM model. Furthermore, sensitivity studies were carried out to evaluate the importance of input parameters. The results show that the BO-LSTM model is robust in predicting TWAP. FP and TWAP (last) are the most important input parameters in TWAP prediction, followed by RSP and NY. Moreover, the total importance scores of loading rates reach 0.229, indicating the necessity of including these parameters into the dataset. The proposed BO-LSTM model is capable of predicting TWAP which serves for shield-roof status intelligent perception.
9

Shi, Ling, Cheng Wu Yang, Xin Ming Yu e Xian Wei Luo. "Development of the Tunnel Wet Dust Precipitator and Testing". Advanced Materials Research 800 (setembro de 2013): 8–12. http://dx.doi.org/10.4028/www.scientific.net/amr.800.8.

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The tunnel wet dust precipitator (TWDP) is designed and applied to the underground mine tunnel dust control. The TWDP is a modular design with the disc which the radiant fine stainless-steel filament and nozzle. Discs are used in serial in axial direction in the TWDP to lift the collection efficiency, and discs are parallel in a section to enlarge the volumetric flow rate. The TWDP, which is connected with the local fan, is mounted at the discharging mine platform, and the experiment is conducted for its performance testing. Results show that the collection efficiency for respirable dust is above 80%.
10

Su, Yu, Lin Li, Ren Yu Fu, Qian Li e Guang Chen. "Mechanism of TWIP Steel Tensile Deformation". Advanced Materials Research 557-559 (julho de 2012): 147–50. http://dx.doi.org/10.4028/www.scientific.net/amr.557-559.147.

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The microstructure of the TWIP steel before and after tenslie test was investigated by metallographic microscopy, X-ray diffraction, scanning electron microscopy and transmission electron microscopy. The results showed that the plastic growth of TWIP steel was mainly due to the TWIP effect induced by twining crystal. Some austenite grains had two or more twining system in the TWIP steel. Both the boundaries of twins and original austenite grain hindered the growth of twins. Its main textures included Goss{110} , Brass{110}, Copper{112} and CuT{552} and evoluted under the effect of twins and dislocation mechanism.
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Artigos de revistas Teses / dissertações Livros

Teses / dissertações sobre o assunto "TWRP":

1

Oskarsson, Tim. "Digital incursion: Breaching the android lock screen and liberating data". Thesis, Högskolan i Halmstad, Akademin för informationsteknologi, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:hh:diva-44939.

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Android is the most used operating system in the world, because of this the probability of an android device being acquired in an investigation is high. To begin to extract data from an android device you first need to gain access to it. Mechanisms like full system encryption can make this very difficult. In this paper, the advantages and disadvantages of different methods of gaining access and extracting data from an android device with an unlocked bootloader are discussed. Many users unlock the bootloader of their android device to gain a much greater level of control over it. Android forensics on a device without a unlocked bootloader is very limited. It is therefore interesting to study how you can extract data from an android device that doesn’t have this limitation to android forensics. A literature study is done on previous related research to gather methods for gaining access and extracting data. The methods collected are then tested by performing experiments on a Oneplus 3 android 9 and Oneplus 8 android 11. The research of this paper found that it is possible to perform a brute force attack within a reasonable time against a PIN of length 4-5 or pattern of length 4-6 on the lock screen of an android device. It found that you can optimise the attack by performing a dictionary attack by using public lists of the most used PIN codes. A list of all possible pattern combinations sorted and optimised for a dictionary attack is generated based on statistics of pattern starting location and length. A proof of concept is made by creating a copy of a fingerprint with common cheap materials to gain access through the fingerprint sensor. A device image were able to be extracted by using a root shell through Android Debug Bridge and common command-line tools. Memory forensics were performed by using Frida and was able to extract usernames, passwords, and emails from Google Chrome and Gmail. The custom recovery image TWRP was used to boot the device, gain root access, and was able to extract a full device image with common command-line tools. The results of the TWRP backup feature is also analysed. The results of the data extraction is then analysed manually and with Autopsy.
2

Eon, Kang Shin. "Hot ductility of TWIP steels". Thesis, City University London, 2014. http://openaccess.city.ac.uk/13703/.

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TWIP (Twining Induced Plasticity) steel is very promising AHSS (Advanced High Strength Steel) grade owing to its superior toughness and ductility. Recently it has attracted the interest of the automotive and steelmaking industries, as the need for reducing weight to provide better fuel efficiency is of paramount importance with the gradual depletion of fuel resources. A high Al, TWIP steel is being commercially developed as Al has been found very well in delaying fraction in deep drawn products. However these steels are difficult to continuous cast and cracking can occur at the slab surface. Therefore it becomes very important to gain an understanding of the cause of this cracking, in order to prevent their occurrence. To assess the likelihood of the cracking in these high Al TWIP steel slabs (1~1.5%Al, 0.6%C, 18%Mn), conventional hot tensile tests were performed to simulate the continuous casting process. A variety of TWIP steels were tested in order to determine the influence of such factors as chemical composition, cooling rate and thermal cycle on hot ductility. Using a cooling rate of 60oC/min after heating to 1250oC, ductility was generally <40% RA (Reduction of Area) indicating that these high Al TWIP steels it will be difficult to cast without transverse cracking occurring. The 1.5%Al containing steels had worse ductility than the low Al containing steels (0.02%Al) because of the presence of large amounts of AlN precipitated at the austenite grain boundaries. Reducing the Al and N level improved ductility. Higher strength Nb/V high Al containing TWIP steels were also examined although ductility was likely to be worse than the simpler microalloying free TWIP steels as was confirmed. Increasing the cooling rate from 60 to 180oC/min after melting caused the ductility to further deteriorate and high N levels produced only a small reduction in the ductility, probably because ductility is so poor. Increasing the S level from 0.003 to 0.01% caused the ductility to deteriorate in TWIP steels free of microalloying. Increasing the S level to 0.023% caused no further deterioration in ductility even though the MnS volume fraction increased. The worse ductility in the higher S steels was not caused by a simple increase in the sulphide volume fraction but more a consequence of the change from coarse hexagonal plate AlN, which are mainly within the matrix and so have little influence on the hot ductility, to very long dendritic rod precipitates, which are situated at the dendritic or close to the austenite grain boundaries. This dendritic precipitation was rarely observed in the low S steel. The MnS inclusions appeared to act as nucleation sites for the precipitation of AlN and when there was few inclusions precipitation of AlN was mainly confined to the matrix. The ductility of Nb containing high Al, TWIP steels was very poor in the as-cast condition. Adding B and Ti still gave rise to extremely poor ductility when a cooling rate of 60 oC/min was used but reducing it to 12oC/min caused the ductility to improve so that RA values were now close to the 35~40% RA value required to avoid transverse cracking. To improve ductility B and Ti additions were examined. 0.04%Ti and 0.002%B are required to ensure good hot ductility in high Al, TWIP steels. Sufficient Ti is needed to remove all the N as TiN so preventing AlN precipitating as films over the austenite grain surfaces. B is also needed as it can segregate to the boundaries and strengthen them. A SIMS technique confirmed that B had indeed segregated to the boundaries. The slower cooling rate 10~15oC/min compared to 60oC/min will result in the optimum segregation of B as well as coarsening the TiN precipitates so they are no longer effective in reducing the ductility. Following all these recommendations, i.e. a low S level, slow secondary cooling rate, a Ti level above the stoichiometric for TiN and a boron addition of 0.002%, transverse cracking was avoided commercially in these very difficult to cast high strength TWIP steels.
3

Kuntz, Matthias. "Verformungsmechanismen hoch manganlegierter austenitischer TWIP-Stähle". Tönning Lübeck Marburg Der Andere Verl, 2007. http://d-nb.info/987256319/04.

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4

Saeed-Akbari, Alireza [Verfasser]. "Mechanism Maps, Mechanical Properties, and Flow Behavior in High-Manganese TRIP/TWIP and TWIP Steels / Alireza Saeed-Akbari". Aachen : Shaker, 2011. http://d-nb.info/107408795X/34.

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5

Lorthios, Julie. "Endommagement des aciers TWIP pour application automobile". Phd thesis, École Nationale Supérieure des Mines de Paris, 2011. http://pastel.archives-ouvertes.fr/pastel-00689791.

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Grâce à l'optimisation de l'effet TWIP (Twinning Induced Plasticity) et à la maîtrise de la microstructure (basse énergie de défaut d'empilement, austénite stable à grains fins), les aciers austénitiques Fe-Mn-C combinent une excellente ductilité à une résistance mécanique élevée. L'étude s'intéresse aux paramètres mécaniques critiques menant à la rupture ductile en mode slant (biseau dans l'épaisseur) et aux aspects physiques de l'endommagement dans le but de déterminer un critère de rupture quantitatif. Le comportement plastique de l'acier TWIP présente un caractère anisotrope et cinématique avec une déformation hétérogène en traction uniaxiale due à un mécanisme de pseudo-vieillissement dynamique. Après avoir déterminé la loi de comportement, la courbe limite de formage a pu être établie par comparaison entre résultats expérimentaux et prédictions du modèle mécanique, dans une large gamme de triaxialité des contraintes. Quel que soit le mode de déformation considéré, la rupture s'effectue brutalement en mode slant sans striction localisée. Peu d'endommagement, y compris en trois dimensions, a été observé autour des zones de rupture. Un critère de rupture phénoménologique basé sur la contrainte équivalente et sur l'angle de Lode, redéfinis tous deux dans l'équivalent de Barlat, permet de prédire de façon correcte la formabilité de l'acier TWIP. L'influence de la pression hydrostatique et du mécanisme de pseudo vieillissement dynamique sur la courbe limite de formage est discutée.
6

Bäumer, Annette. "Verfestigungsverhalten von hochmanganhaltigen Stählen mit TWIP-Effekt". Aachen Shaker, 2008. http://d-nb.info/993341659/04.

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Lindahl, Bonnie. "Thermodynamic investigation of systems related to TWIP steels". Doctoral thesis, KTH, Termodynamisk modellering, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-166224.

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The world is facing serious challenges regarding environmental issues. Carbon dioxide levels increase every day. In an attempt to decrease carbon emissions the automotive industry searches for lighter, stronger materials. TWinning Induced Plasticity (TWIP) steels show an impressive combination of strength and ductility. The possibility of adding high amounts of aluminum that decreases the density while maintaining the mechanical properties makes this type of steel very interesting for use in automotive applications. The only thing keeping the TWIP steels from being used in the automotive industry is that the Yield Strength (YS) is too low. The TWIP steels usually have a YS around 400 MPa. For them to be useful in automotive applications YS around 600-700 MPa is necessary. One of the most promising ways of improving the YS is by precipitation hardening. This work has been performed within a European Research Fund for Coal and Steel (RFCS) project called Precipitation in High Manganese steels (PrecHiMn). As the name of the project suggests, the goal of this project has been to study the precipitation in TWIP steels. The precipitation hardening is achieved through the addition of carbide and carbonitride formers such as Nb, Ti and V. In order to build advanced models to simulate precipitation it is important to have a good understanding of the thermodynamics of systems related to TWIP steels. The goal of this work has been to study the thermodynamic properties of systems related to TWIP steels, more specifically the system forming the matrix phases of TWIP steels. Therefore the Al-C-Fe-Mn system has been studied as well as the Al-Ti-V system. Complete thermodynamic descriptions that reproduce the experimental data well have been produced including descriptions of order-disorder transformations.
Varlden star infor stora utmaningar nar det galler miljofragor. Koldioxidnivaerna okar varje dag. I ett forsok att minska koldioxidutslappen soker bilindustrinefter lattare och starkare material. TWinning Induced Plasticity (TWIP)stal uppvisar en imponerande kombination av hallfasthet och duktilitet. Mojlighetenatt tillsatta hoga halter av aluminium som minskar densiteten med bibehallnamekaniska egenskaper gor denna typ av stal mycket intressanta for anvandning ifordonstillampningar. Det enda som hindrar TWIP stal fran att anvandas inomfordonsindustrin ar att strackgransen ar for lag. TWIP stal har vanligtvis enstrackgrans runt 400 MPa. For att de ska vara anvandbara i biltillampningarkravs en strackrans omkring 600-700 MPa. Ett av de mest lovande satten attforbattra strackgransen ar genom utskiljningshardning. Detta arbete har utfortsinom en europeisk forskningsfond for kol och stal (RFCS) projekt kallat Precipitationin High Manganese steels (PrecHiMn). Som namnet pa projektetantyder, har malet med projektet varit att studera utskiljning i TWIP stal.Utskiljningshardning uppnas genom tillsats av karbid- och karbonitridbildaresasom Nb, Ti och V. For att bygga avancerade modeller for simulering av utskiljningar det viktigt att ha en god forstaelse for termodynamiken i systemrelaterade till TWIP stal.Malet med detta arbete har varit att studera de termodynamiska egenskapernahos system med anknytning till TWIP stal. Mer specikt har systemetsom bildar matrisfaserna i TWIP stal. Drfr har Al-C-Fe-Mn-systemet studeratsliksom Al-Ti-V-systemet. Fullstandiga termodynamiska beskrivningar somaterger experimentella data val har producerats inklusive beskrivningar av ordningsomvandlingar.

QC 20150506


RFSR-CT-2010-00018
8

Rahman, Khandaker Mezanur. "Mechanical behaviour of Twinning Induced Plasticity (TWIP) steels". Thesis, Imperial College London, 2013. http://hdl.handle.net/10044/1/14299.

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TWinning Induced Plasticity (TWIP) steels are single phase austenitic alloys that successfully combine the properties of high strength and ductility. Thus, TWIP steels are an ideal candidate material for applications where the absorption of energy is required, such as armour or automotive crash safety systems. The TWIP effect arises due to the formation of thin lenticular deformation twins during straining. These twins act as strong barriers to dislocation movement. This results in a dynamic grain refinement process, leading to an increasing work hardening capacity and superior ductility. This thesis presents work carried out to develop our understanding of the mechanical properties and the micromechanics of twinning in a TWIP steel during deformation. In-situ X-ray synchrotron diffraction loading experiments were conducted to investigate the evolution of deformation texture, lattice strain and peak width during deformation at quasi- static strain rates. The lattice strain evolution indicated that twinning occurs very early during deformation and remarkably initiates before the macroscopic yield point. In addition, the in-situ experimental observations were modelled successfully using an elasto-plastic self consistent (EPSC) model. The armour capabilities of the material was investigated using Hopkinson pressure bar and blast testing. The characteristics of twinning were found to be dependent on the strain rate. Fewer active twin systems were observed at high strain rates (i.e. >1000 s-1) while the twins were relatively thicker compared to those observed at lower strain rates. TWIP steels have not obtained widespread use particularly in the automotive sector due to their relatively low yield stress compared to alternative advanced high strength steels. Cold rolling and annealing was performed on the as-received TWIP steel to explore alloy strengthening using a grain refinement mechanism. The influence of initial grain size on twinning was investigated and a critical twin stress of 50 MPa at the single crystal limit was determined.
9

Bäumer, Annette [Verfasser]. "Verfestigungsverhalten von hochmanganhaltigen Stählen mit TWIP- Effekt / Annette Bäumer". Aachen : Shaker, 2009. http://d-nb.info/115651732X/34.

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10

Zorzi, Julio Cezar de Sousa. "Avaliação do processamento de aço trip-twip em escala piloto". Universidade Federal de Minas Gerais, 2014. http://hdl.handle.net/1843/BUBD-9VNHHH.

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Currently, the structure of automobiles is composed of different types of steels, according to the specific function of each component. Parts that require high mechanical strength are produced with conventional high-strength steels (HSLA, CMn, IF-HSS etc.) or with the first generation of advanced high strength steels (AHSS - dual phase, TRIP, Complex Phase etc.). The second generation of steels, which includes the TWIP steel, is characterized by a combination of high strength with excellent formability. The TWIP steel (Twinning Induced Plasticity) is characterized by high manganese content (15-30%), which determines its fully austenitic microstructure at room temperature. The intense formation of twinned grains is the mechanism responsible for the excellent formability of this type of steel. This study aimed to evaluate the processing conditions of the TRIP-TWIP steel in pilot scale and provide subsidies for the industrial development of this type of steel at Usiminas. In the hot deformation step, the steel studied showed softening large capacity, especially at higher temperatures. The rolling load during cold rolling pilot reached peaks of around 200 t, values higher than those achieved during pilot process of the steels TRIP780 and DP1000. A homogeneous austenitic microstructure and mechanical properties values were consistent with those reported in the literature, obtained to the annealing temperature at 750°C. The increase in the amount of plastic deformation after annealing resulted in a significant enhance in the percentage of martensite ' instead of austenite, indicating that the main mechanism to increase plasticity of steel is assessed with TRIP effect, although they were also identified in twinned strain (TWIP effect) within the remaining austenite grain.
Atualmente, a estrutura dos automóveis é composta por diferentes tipos de aços, de acordo com a função específica de cada componente. As peças que exigem elevada resistência mecânica são produzidas com aços convencionais de alta resistência (HSLA, CMn, IF-HSS etc.) ou com a primeira geração de aços avançados de alta resistência (AHSS - Dual phase, TRIP, Complex Phase etc.). A segunda geração desses aços, na qual se inclui o aço TWIP, é caracterizada por uma combinação de alta resistência com excelente capacidade de conformação. O aço TWIP (Twinning Induced Plasticity) é caracterizado pelo elevado teor de manganês (15-30%, em massa), o que determina sua microestrutura totalmente austenítica em temperatura ambiente. A intensa formação de maclas no interior dos grãos é o mecanismo responsável pela excelente capacidade de deformação desse tipo de aço. Este estudo teve como objetivo avaliar as condições de processamento do aço TRIP-TWIP em escala piloto e fornecer subsídios para que, no futuro, possam ser conduzidas experiências para o desenvolvimento industrial desse tipo de aço na Usiminas. Na etapa de deformação a quente, o aço estudado mostrou grande capacidade de amaciamento, principalmente em temperaturas mais altas. Já durante a laminação a frio, a carga de laminação piloto alcançou picos da ordem de 200 t, valores superiores aos alcançados durantes a laminação de aços de DP1000 e TRIP780. O recozimento a 750°C gerou uma microestrutura austenítica homogênea e valores de propriedades mecânicas compatíveis com aqueles relatados na literatura. O aumento na quantidade de deformação plástica após o recozimento propiciou um aumento significativo no teor de martensita em detrimento da austenita, indicando que o principal mecanismo de aumento de plasticidade para o aço avaliado é o efeito TRIP, embora tenham sido identificadas também maclas de deformação (efeito TWIP) no interior dos grãos austeníticos remanescentes.
Mais fontes

Livros sobre o assunto "TWRP":

1

Gates, Susan. Trowsus twp. Caerdydd: Gwasg Addysgol Drake, 2001.

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2

Weidner, Anja. Deformation Processes in TRIP/TWIP Steels. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-37149-4.

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3

Biermann, Horst, e Christos G. Aneziris, eds. Austenitic TRIP/TWIP Steels and Steel-Zirconia Composites. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-42603-3.

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4

Kepple, Arnold. 50 years Callensburg-Licking Twp. VFC. Callensburg, Pennsylvania: Arnold Kepple, 2009.

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5

Berger, B. R. Precambrian geology: Laval and Hartman townships. Toronto, Ont: Ontario Ministry of Northern Development and Mines, 1990.

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Berger, B. R. Precambrian geology: Melgund Lake Area. Toronto, Ont: Ontario Ministry of Northern Development and Mines, Mines and Minerals Division, 1989.

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Berger, B. R. Precambrian geology: Manitou Stretch area. Toronto: Ontario Ministry of Northern Development and Mines, 1991.

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Ontario Geological Survey. Sedimentary and Environmental Geoscience Section. Aggregate resources inventory of Haldimand and Alnwick Townships, Northumberland County. Toronto, Ont: Queen's Printer for Ontario, 1992.

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Bohm, Joan. 1870 census of Ross Twp, Clinton County, Indiana: Index. Frankfort, IN (602 Ricker Dr., Frankfort 46041-3454): [Historic Pub. Co.], 1991.

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Society, Blair County Genealogical. Cemeteries of Freedom Twp: Freedom Township, Blair County, Pennsylvania. Hollidaysburg, PA: Blair County Genealogical Society, Inc., 2012.

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Mais fontes

Capítulos de livros sobre o assunto "TWRP":

1

Yu, Xianglong, e Ji Zhou. "Cold Rolling of TWIP Steels". In Rolling of Advanced High Strength Steels, 415–49. Boca Raton, FL : CRC Press, [2017]: CRC Press, 2017. http://dx.doi.org/10.1201/9781315120577-10.

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2

Fonstein, Nina. "Austenitic Steels with TWIP Effect". In Advanced High Strength Sheet Steels, 369–92. Cham: Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-19165-2_11.

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3

Weidner, Anja. "Motivation". In Deformation Processes in TRIP/TWIP Steels, 1–5. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-37149-4_1.

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4

Weidner, Anja. "Correction to: Deformation Processes in TRIP/TWIP Steels". In Deformation Processes in TRIP/TWIP Steels, C1. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-37149-4_10.

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5

Weidner, Anja. "Plastic Deformation and Strain Localizations". In Deformation Processes in TRIP/TWIP Steels, 7–45. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-37149-4_2.

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6

Weidner, Anja. "Martensitic Phase Transformation". In Deformation Processes in TRIP/TWIP Steels, 47–69. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-37149-4_3.

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7

Weidner, Anja. "Advanced High-Strength Steels". In Deformation Processes in TRIP/TWIP Steels, 71–98. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-37149-4_4.

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8

Weidner, Anja. "In Situ Techniques for Characterization of Strain Localizations and Time Sequence of Deformation Processes". In Deformation Processes in TRIP/TWIP Steels, 99–203. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-37149-4_5.

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9

Weidner, Anja. "Object of Investigations—High-Alloy Fe–16Cr–6Mn–xNi–0.05C Cast Steels with TRIP/TWIP Effect". In Deformation Processes in TRIP/TWIP Steels, 205–44. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-37149-4_6.

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10

Weidner, Anja. "Case Studies on Localized Deformation Processes in High-Alloy Fe–16Cr–6Mn–xNi–0.05C Cast Steels". In Deformation Processes in TRIP/TWIP Steels, 245–364. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-37149-4_7.

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Trabalhos de conferências sobre o assunto "TWRP":

1

Mandhare, Archana P., e Sujata V. Kadam. "E-TWRP: Establishing trust worthy reliable path in Mobile Adhoc Network". In 2016 International Conference on Emerging Technological Trends (ICETT). IEEE, 2016. http://dx.doi.org/10.1109/icett.2016.7873711.

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2

Guo, Chao, Daogang Lu e Hao Huang. "Preliminary Development of System Analysis Code for Traveling-Wave Reactor". In 2013 21st International Conference on Nuclear Engineering. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/icone21-15737.

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Traveling wave reactors (TWR) are high-burnup nuclear reactors designed to operate indefinitely using fertile material such as natural or depleted uranium (DU), light-water reactor (LWR) waste, or thorium as reload fuel. After an initial partial loading of fissile fuel, the TWR will operate for decades without needing reprocessing or further enrichment, until the lifetime of major structural components is reached. For the safety analysis of this kind of reactor, it is necessary to develop a system analysis code. In the present paper, a system code (named as “TRAVELER”) was developed for a conceptually designed traveling wave reactor. In this code, some important models were established in detail, such as core neutron kinetics model, key equipment models (including centrifugal pump, check valve, lower plenum, upper plenum, fuel assembly, to utilize fuel efficiently without uranium enrichment or reprocessing, instead directly using depleted uranium, natural uranium, thorium, spent fuel removed from light water reactors, or some combination of these materials. The name refers to the fact that fission does not occur throughout the entire TWR core, but remains confined to a boundary zone that slowly advances through the core over time. TWRs could theoretically run, bypass flow channel, pipes connecting these major components) and calculation logic under steady state and transient operation condition. The travelling wave reactor system analysis code currently for the thermal-hydraulic analysis of primary heat transport system was finished. It is expected that the present code could be used for the design and safety analysis of travelling wave reactor to be developed in China.
3

Muraki, Kaznnori, Susumu Akamine, Kenji Satoh e Sinichi Ando. "TWP". In the 15th conference. Morristown, NJ, USA: Association for Computational Linguistics, 1994. http://dx.doi.org/10.3115/991250.991284.

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Weaver, Kevan D., John Gilleland, Charles Ahlfeld, Charles Whitmer e George Zimmerman. "A Once-Through Fuel Cycle for Fast Reactors". In 17th International Conference on Nuclear Engineering. ASMEDC, 2009. http://dx.doi.org/10.1115/icone17-75381.

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A paradigm shift has recently altered the design targets for advanced nuclear energy systems that use a fast neutron spectrum. A previous emphasis on extending fissile fuel reserves has been supplanted by a desire for reactor technologies that are “cleaner, more efficient, less waste-intensive, and more proliferation-resistant.” [1] This shift, along with recent advances in fast-reactor designs that enable high fuel burn-up even with fuels that have been minimally enriched, creates an opportunity to employ fast reactors in an open nuclear fuel cycle. These goals now appear feasible as a result of recent design work exploiting a phenomenon, known as a traveling wave, that can attain high burn-ups without reprocessing. A traveling-wave reactor (TWR) breeds and uses its own fuel in place as it operates. Fueled almost entirely by depleted or natural uranium, such reactors would also require little initial enrichment. We have performed calculations demonstrating that TWRs can achieve burn-ups of ≥20%, which is four to five times that realized in current LWRs. Burn-ups of up to 50% appear feasible. The factors that contribute to these high burn-ups and the implications for materials design will be discussed.
5

Qiao, Pengrui, Jian Zhang e Chao Lin. "Unprotected Overpower Transient Analysis of a Million Kilowatt Traveling Wave Reactor Core". In 2017 25th International Conference on Nuclear Engineering. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/icone25-66057.

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Traveling wave reactor (TWR) is an innovation concept nuclear reactor, through the once-through deep burning, the proliferation of fuel can be achieved and the utilization rate of Uranium can be increased. TWR has the characteristics of long lifetime, deep burn up and nuclear nonproliferation, because of its physical character, which makes it to be an attractive innovation concept fast reactor. The China institute of atomic energy (CIAE) has designed a million kilowatt TWR core based on a breeding and burn principle, which has considered the current technological level of sodium cooled fast reactor. In this paper, based on the TWR core design scheme, considered the design of fuel assembly, neutronics and thermal-hydraulic, analyzed the unprotected overpower transient (UTOP) accident in the TWR core with the SAS4A code, through which research about the transient safety characteristics of a million kilowatt travelling wave reactor core has been done. Analysis shows that the peak temperature of fuel, cladding and coolant in the TWR core have a certain margin from the safety limits through the negative feedback of itself in the UTOP accident, the core of the million kilowatt TWR demonstrates a good safety performance.
6

Hu, Wenjun, e Pengrui Qiao. "Unprotected Loss of Flow Analysis of a Million Kilowatt Traveling Wave Reactor Core". In 2017 25th International Conference on Nuclear Engineering. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/icone25-66101.

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Traveling wave reactor (TWR) is an innovation concept nuclear reactor, through the once-through deep burning, the proliferation of fuel can be achieved and the utilization rate of Uranium can be increased. TWR has the characteristics of long lifetime, deep burn up and nuclear nonproliferation, because of its physical character, which makes it to be an attractive innovation concept fast reactor. The China institute of atomic energy (CIAE) has designed a million kilowatt TWR core based on a breeding and burn principle, which has considered the current technological level of sodium cooled fast reactor. In this paper, based on the TWR core design scheme, considered the design of fuel assembly, neutronics and thermal-hydraulic, analyzed the Unprotected loss of flow (ULOF) accident in the TWR core with the SAS4A code, through which research about the transient safety characteristics of a million kilowatt travelling wave reactor core has been done. Analysis shows that the peak temperature of fuel, cladding and coolant in the TWR core have a certain margin from the safety limits through the negative feedback of itself in the ULOF accident, the core of the million kilowatt TWR demonstrates a good safety performance.
7

Faedfar, Y. "4-Block 4-phase multiplexer for MIMO-TWRC". In 2016 International Conference on Information and Communication Technology Convergence (ICTC). IEEE, 2016. http://dx.doi.org/10.1109/ictc.2016.7763568.

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8

Dinamani Singh, Aheibam, e Suparna Goswami. "Performance of digital modulations over TWDP fading channel". In 2015 International Conference on Electronic Design, Computer Networks & Automated Verification (EDCAV). IEEE, 2015. http://dx.doi.org/10.1109/edcav.2015.7060554.

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9

Muqaibel, Ali H. "Improved compressive sensing with antenna directivity for TWRI". In 2015 IEEE International Symposium on Antennas and Propagation & USNC/URSI National Radio Science Meeting. IEEE, 2015. http://dx.doi.org/10.1109/aps.2015.7304587.

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10

Campbell, Steven, Andrew Denneno, James Knowles e Michael Matthews. "The Terminal Weather Information for Pilots (TWIP) program". In 34th Aerospace Sciences Meeting and Exhibit. Reston, Virigina: American Institute of Aeronautics and Astronautics, 1996. http://dx.doi.org/10.2514/6.1996-139.

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Relatórios de organizações sobre o assunto "TWRP":

1

Calderon, L. M. ,. Westinghouse Hanford. TWRS safety program plan. Office of Scientific and Technical Information (OSTI), agosto de 1996. http://dx.doi.org/10.2172/328474.

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2

Popielarczyk, R. S. ,. Westinghouse Hanford. TWRS safety management plan. Office of Scientific and Technical Information (OSTI), agosto de 1996. http://dx.doi.org/10.2172/657575.

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3

Orme, R. M. TWRS privatization process technical baseline. Office of Scientific and Technical Information (OSTI), setembro de 1996. http://dx.doi.org/10.2172/658905.

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4

Rieck, R. H. TWRS LDUA utilization study report. Office of Scientific and Technical Information (OSTI), setembro de 1994. http://dx.doi.org/10.2172/10178784.

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5

Eiholzer, C. R. TWRS Systems Engineering Working Plan. Office of Scientific and Technical Information (OSTI), setembro de 1994. http://dx.doi.org/10.2172/10187619.

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6

Vann, J. M. TWRS Configuration management program plan. Office of Scientific and Technical Information (OSTI), junho de 1996. http://dx.doi.org/10.2172/662064.

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7

Smith-Fewell, M. A. TWRS safety SSCs: Requirements and characteristics. Office of Scientific and Technical Information (OSTI), dezembro de 1997. http://dx.doi.org/10.2172/362380.

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8

Vann, J. M. TWRS configuration management requirement source document. Office of Scientific and Technical Information (OSTI), setembro de 1997. http://dx.doi.org/10.2172/362382.

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9

Mendoza, D. P. TWRS authorization basis configuration control summary. Office of Scientific and Technical Information (OSTI), dezembro de 1997. http://dx.doi.org/10.2172/362389.

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10

Adams, M. R. TWRS process engineering data management plan. Office of Scientific and Technical Information (OSTI), maio de 1997. http://dx.doi.org/10.2172/10154215.

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