Deformation-induced twinning or martensitic transformation can improve the work-hardening capabil-ity of alloys with face-centered cubic(FCC)structures and suppress strain *** stacking fault energy(SFE)of alloys plays...
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Deformation-induced twinning or martensitic transformation can improve the work-hardening capabil-ity of alloys with face-centered cubic(FCC)structures and suppress strain *** stacking fault energy(SFE)of alloys plays a key role in determining deformation mechanisms and mechanical *** study developed V-bearing high-Mn steel with a tensile strength of 1288 MPa and uniform elongation of 36%by tactfully designing the *** of V-carbides was selected to strengthen the steel and tune the global SFE of the matrix by settling *** work-hardening capability due to lower SFE and finer twin/matrix lamellae provided the steel with good ductility,while precipitation strengthened it.
Obfuscation techniques are frequently used in malicious programs to evade detection. However, current effective methods often require much memory space during training. This paper proposes a machine-learning-based sol...
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Due to the unclear distribution characteristics and causes of fluoride in groundwater of Mihe-Weihe River Basin(China),there is a higher risk for the future development and utilization of ***,based on the systematic s...
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Due to the unclear distribution characteristics and causes of fluoride in groundwater of Mihe-Weihe River Basin(China),there is a higher risk for the future development and utilization of ***,based on the systematic sampling and analysis,the distribution features and enrichment mechanism for fluoride in groundwater were studied by the graphic method,hydrogeochemical modeling,the proportionality factor between conventional ions and factor *** results show that the fluorine content in groundwater is generally on the high side,with a large area of medium-fluorine water(0.5–1.0 mg/L),and high-fluorine water is chiefly in the interfluvial lowlands and alluvial-marine plain,which mainly contains HCO_(3)·Cl-Na-and HCO_(3)^(-)Na-type *** vertical zonation characteristics of the fluorine content decrease with increasing depth to the water *** high flouride groundwater during the wet season is chiefly controlled by the weathering and dissolution of fluorine-containing minerals,as well as the influence of rock weathering,evaporation and *** weak alkaline environment that is rich in sodium and poor in calcium during the dry season is the main reason for the enrichment of ***,an integrated assessment model is established using rough set theory and an improved matter element extension model,and the level of groundwater pollution caused by fluoride in the Mihe-Weihe River Basin during the wet and dry seasons in the Shandong Peninsula is defined to show the necessity for local management measures to reduce the potential risks caused by groundwater quality.
Various organizations store data online rather than on physical *** the number of user’s data stored in cloud servers increases,the attack rate to access data from cloud servers also *** researchers worked on differe...
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Various organizations store data online rather than on physical *** the number of user’s data stored in cloud servers increases,the attack rate to access data from cloud servers also *** researchers worked on different algorithms to protect cloud data from replay *** of the papers used a technique that simultaneously detects a full-message and partial-message replay *** study presents the development of a TKN(Text,Key and Name)cryptographic algorithm aimed at protecting data from replay *** program employs distinct ways to encrypt plain text[P],a user-defined Key[K],and a Secret Code[N].The novelty of the TKN cryptographic algorithm is that the bit value of each text is linked to another value with the help of the proposed algorithm,and the length of the cipher text obtained is twice the length of the original *** the scenario that an attacker executes a replay attack on the cloud server,engages in cryptanalysis,or manipulates any data,it will result in automated modification of all associated values inside the *** mechanism has the benefit of enhancing the detectability of replay ***,the attacker cannot access data not included in any of the papers,regardless of how effective the attack strategy *** the end of paper,the proposed algorithm’s novelty will be compared with different algorithms,and it will be discussed how far the proposed algorithm is better than all other algorithms.
Refractory high-entropy alloys(RHEAs)are potential materials for high-temperature structural applica-tions due to their excellent high-temperature ***,the early onset of plastic instability in RHEAs is a critical issu...
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Refractory high-entropy alloys(RHEAs)are potential materials for high-temperature structural applica-tions due to their excellent high-temperature ***,the early onset of plastic instability in RHEAs is a critical issue to be *** this study,a novel Zr35 Ti30 Nb20 Al10 V5 RHEA was subjected to 95%cold rolling and annealing,achieving outstanding mechanical ***,the cold-rolled alloy exhibited the highest reported tensile strength(∼2.0 GPa)among RHEAs with a moderate ductil-ity of∼8.5%.Moreover,Additionally,the subsequent annealing process enabled the alloy to achieve an outstanding combination of yield strength(1.1 GPa)and fracture elongation(20%).The cold-rolled alloy has a heterogeneous lamella structure with high-density dislocation cells and dislocation pile-ups,and lattice distortion in the locally chemically ordered *** high work hardening behavior origi-nates from the heterogeneous deformation-induced(HDI)hardening,which makes the HDI stress and hardening rate increase with increasing *** the annealed alloy,lattice distortion increases signifi-cantly with increasing strain,promoting dislocation *** dislocation pile-ups and interactions facilitate the transition of microbands,and the relatively stable work-hardening behavior of the alloy is mainly attributed to the microband-induced plasticity *** study provides novel insights into the design and optimization of highly formable RHEAs with excellent mechanical properties.
The equiatomic TiNbZrTaHf alloy was successfully rolled at room temperature with the reduction of ~ 85%. The microstructure and tensile properties were investigated after cold working and annealing. It was determined ...
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The equiatomic TiNbZrTaHf alloy was successfully rolled at room temperature with the reduction of ~ 85%. The microstructure and tensile properties were investigated after cold working and annealing. It was determined that the recrystallization temperature of the TiNbZrTaHf alloy between 850 and 900 ℃. Complete recrystallization and normal grain growth occurred, the high stability of single phase was maintained after annealing at 1000, 1200, and 1400 ℃. But the precipitated phase appeared after long term annealing, as seen after 500 h at 1000 ℃. After cold working, the tensile strength and the elongation of TiNbZrTaHf were 1137 MPa and 25.1%, respectively. The annealed alloy has a high tensile strength (σ_(b )= 863 MPa) and ductility (ε_(e )= 28.5%). Moreover, the oxidation of TiNbZrTaHf alloy at elevated temperatures has a significant impact on its mechanical properties. The poor oxidation resistance of TiNbZrTaHf can accelerate tensile failure by inducing fractures at grain boundaries.
Due to its decentralized and tamper-proof features, blockchain is frequently employed in the financial, traceability, and distributed storage industries. The agreement algorithm, which is a crucial component of the bl...
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Missing data in multivariate time series are common issues that can affect the analysis and downstream applications. Although multivariate time series data generally consist of the trend, seasonal and residual terms, ...
In recent years,image processing based on stochastic resonance(SR)has received more and more *** this paper,a new model combining dynamical saturating nonlinearity with regularized variational term for enhancement of ...
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In recent years,image processing based on stochastic resonance(SR)has received more and more *** this paper,a new model combining dynamical saturating nonlinearity with regularized variational term for enhancement of low contrast image is *** regularized variational term can be setting to total variation(TV),second order total generalized variation(TGV)and non-local means(NLM)in order to gradually suppress noise in the process of solving the *** addition,the new model is tested on a mass of gray-scale images from standard test image and low contrast indoor color images from Low-Light dataset(LOL).By comparing the new model and other traditional image enhancement models,the results demonstrate the enhanced image not only obtain good perceptual quality but also get more excellent value of evaluation index compared with some previous methods.
The existing nearest neighbor query methods cannot directly perform the nearest neighbor query of specified geographical direction *** order to compensate the shortcomings of the existing methods,a directional nearest...
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The existing nearest neighbor query methods cannot directly perform the nearest neighbor query of specified geographical direction *** order to compensate the shortcomings of the existing methods,a directional nearest neighbor query method in specific direction space based on Voronoi diagram is put *** work studies two cases,*** query point is static and the query point moves with a constant *** the static condition,the corresponding pruning method and the pruning algorithm of the specified direction nearest neighbor(pruning_SDNN algorithm)are proposed by combining the plane right-angle coordinate system with the north-west direction,and then according to the smallest external rectangle of Voronoi polygon,the specific query is made and the direction nearest neighbor query based on Voronoi rectangle(VR-DNN) algorithm is *** the case of moving with a constant velocity,first of all,the combination of plane right angle coordinate system,geographical direction and circle are used,the query range is determined and pruning methods and the pruning algorithm of the direction nearest neighbor based on decision circle(pruning_DDNN algorithm) are put ***,according to the different position of motion trajectory and Voronoi diagram,a specific query through the nature of Voronoi diagram is *** last,the direction nearest neighbor query based on Voronoi diagram and motion trajectory(VM-DNN) algorithm is put *** theoretical research and experiments show that the proposed algorithm can effectively deal with the problem of the nearest neighbor query for a specified geographical direction space.
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