The quantum search on the graph is a very important topic.In this work,we develop a theoretic method on searching of single vertex on the graph[Phys.Rev.Lett.114110503(2015)],and systematically study the search of man...The quantum search on the graph is a very important topic.In this work,we develop a theoretic method on searching of single vertex on the graph[Phys.Rev.Lett.114110503(2015)],and systematically study the search of many vertices on one low-connectivity graph,the joined complete graph.Our results reveal that,with the optimal jumping rate obtained from the theoretical method,we can find such target vertices at the time O(√N),where N is the number of total vertices.Therefore,the search of many vertices on the joined complete graph possessing quantum advantage has been achieved.展开更多
Silicon nitride composite is joined to itself by heating interlayer of Y2 O3 -AL2O3 -SiO2 mixtures above their liquidus temperatures in flowing nitrogen. The joined specimens are tested in four point flexure from room...Silicon nitride composite is joined to itself by heating interlayer of Y2 O3 -AL2O3 -SiO2 mixtures above their liquidus temperatures in flowing nitrogen. The joined specimens are tested in four point flexure from room temperature to 1373 K. The interface microstruclure and fractured surfaces after testing are observed and analyzed by SEM, EPMA and XRD respectively. The results show that F2 O3 -A12 O3 -SiO2 glass reacts with Si3 N4 at interface, forming the Si3 N4/Si2 N2 O( Y-AlrSi-O-N glass/ Y-Al- Si-O glass gradient interface. With the increase of bonding temperature and holding time, the joint strength first increases, reaching a peak, and then decreases . According to interfacial analyses , the bonding strength depends on joint thickness .展开更多
A new testing methodology was developed to quantitively study galvanic corrosion of AZ31B and thermoset carbon-fiber–reinforced polymer spot-joined by a friction self-piercing riveting process.Pre-defined areas of AZ...A new testing methodology was developed to quantitively study galvanic corrosion of AZ31B and thermoset carbon-fiber–reinforced polymer spot-joined by a friction self-piercing riveting process.Pre-defined areas of AZ31B in the joint were exposed in 0.1 M NaCl solution over time.Massive galvanic corrosion of AZ31B was observed as exposure time increased.The measured volume loss was converted into corrosion current that was at least 48 times greater than the corrosion current of AZ31B without galvanic coupling.Ninety percent of the mechanical joint integrity was retained for corroded F-SPR joints to 200 h and then decreased because of the massive volume loss of AZ31B。展开更多
Green and low carbon promote the application and development of light-weight materials in body-in-white. Large-scale die-casting Al alloy (DCAA) and high-strength thermo-formed steel sheet (TFSS) have put forward high...Green and low carbon promote the application and development of light-weight materials in body-in-white. Large-scale die-casting Al alloy (DCAA) and high-strength thermo-formed steel sheet (TFSS) have put forward higher requirements for the application of joining technology of high-strength steel/Al dissimilar materials. Taking the new die-casting Al alloy body as an example, this paper systematically studies the progress of the latest joining methods of steel/Al dissimilar material with combination of two-layer plate and three-layer plate. By analyzing the joining technologies such as FSPR, RES, FDS and SPR, the technology and process characteristics of steel/Al dissimilar material joining are studied, and the joining technical feasibility and realization means of different material combination of the body are analyzed. The conditions of material combination, material thickness, material strength, flange height, preformed holes and joint spacing for achieving high-quality joining are given. The FSPR joining technology is developed and tested in order to meet with the joining of parts with DCAA and TFSS, especially for the joining of three-layer plates with them. It finds the method and technical basis for the realization of high quality joining of dissimilar materials, provides the early conditions for the application of large DCAA and TFSS parts in body-in-white, and meets the design requirements of new energy body. .展开更多
Editor’s notes: Now, the E.B of CHINA AUTO has been moved to Beijing Operations of CATARC (also named Beijing CATARC Automotive Technology Development Co., Ltd.). With the purpose of giving you further information on...Editor’s notes: Now, the E.B of CHINA AUTO has been moved to Beijing Operations of CATARC (also named Beijing CATARC Automotive Technology Development Co., Ltd.). With the purpose of giving you further information on CATARC and its Beijing branch, and for more convenience on concerned business now and then, we show you their brief introduction. Hope CATARC could act as a bridge of automotive industry both inside and outside.展开更多
BORN to a poor farmer’s family at Yangxi Village, Yeping Town, Ruijin County (today’s Ruijin City) of Jiangxi Province in 1914, I was sent to the Lius to be a child daughter-in-law. The Lius were too poor to support...BORN to a poor farmer’s family at Yangxi Village, Yeping Town, Ruijin County (today’s Ruijin City) of Jiangxi Province in 1914, I was sent to the Lius to be a child daughter-in-law. The Lius were too poor to support themselves. They had nothing but two sons. Worried about not having enough money to purchase a daughter-in-law in the future, the family accepted me as a child daughter-in-law-to-be. I was told by my elders that when I was three years old, I went with my father-in-law to beg. On the way, I was bitten by a rich family’s dog, causing my mother-in-law to burst into tears. My father-in-law died before long, leaving his wife, two sons and I with nothing to live on. With an uncle-in-law展开更多
Joining is a crucial process for the production of complex-shaped advanced engineering materials.Deep understanding of ceramic–metal interfaces during joining or following heat-treatment steps is therefore of importa...Joining is a crucial process for the production of complex-shaped advanced engineering materials.Deep understanding of ceramic–metal interfaces during joining or following heat-treatment steps is therefore of important concern in designing the new systems.Capacitor discharge joining(CDJ)method was firstly carried out to compose the ceramic–metal joint material by silicon nitride(Si3N4)–titanium(Ti)constituents.Afterwards,heat treatment was performed on the Si3N4-Ti joints in air atmosphere at 1000℃temperature to reveal the interface reactions and phases.Reaction layer that occurred between the Si3N4 and Ti interfaces and new phase formations were examined by transmission electron microscopy(TEM)-based various imaging and chemical analysis techniques.Electron transparent samples for TEM characterization were prepared by focused ion beam(FIB)milling and lifting method.Based on the detailed TEM results,Si and N diffusion arising from the Si3N4 ceramic was observed towards Ti metal foil side and further interacted with Ti atoms.The upshot of current diffusion was that Ti3N2 reaction layer with 50 nm thickness was formed at the interface while titanium silicon nitride(Ti6Si3N)matrix phase including dendritic-shaped Ti2 N grains occurred in the Ti interlayer.It is believed that our TEM-based microscopy results not only provide the knowledge on ceramic–metal joint materials by CDJ method,but also contribute new insights on the development of various new joint systems.展开更多
Layered double hydroxide(LDH)conversion coatings loaded with corrosion inhibitors were suggested for the surface treatment of the aluminum alloy 2024-T3,prior to friction spot joining with carbon-fiber reinforced poly...Layered double hydroxide(LDH)conversion coatings loaded with corrosion inhibitors were suggested for the surface treatment of the aluminum alloy 2024-T3,prior to friction spot joining with carbon-fiber reinforced polyphenylene sulfide(AA2024-T3/CF-PPS).Vanadate was used as a model corrosion inhibitor.Lap shear testing method revealed an increase of approx.20%of the joint’s adhesion performance when treated with LDH and before exposure to salt spray.The evaluation of the joints after exposure to salt spray demonstrated a significant difference in the corrosion behavior of the joints when the AA2024-T3 is treated with LDH loaded with nitrate and vanadate species.The LDH intercalated with nitrate revealed a clear improvement in the mechanical and corrosion resistance performance of the joints,even after 6 weeks of salt spray.However,the LDH intercalated with vanadate failed in providing protection against corrosion as well as preserving the mechanical properties of the joints.The effect of the galvanic corrosion was further investigated by zero resistance ammeter(ZRA)measurements as well as localized scanning vibrating electrode technique(SVET).展开更多
Ⅰ.Decide whether the following statementsare True or False:1.If a speaker wants to give the same amountof importance to the joined constituents ofthe sentence,he uses the way of subordina-
实现各类预想故障下潮流转移比快速仿真分析是电网安全稳定运行的重要保证。针对现有实际运行方式中潮流转移分析困难问题,提出大规模电力系统潮流转移比多核并行批处理方法。该方法基于广泛使用的商业大系统分析工具,在参数解析分类、...实现各类预想故障下潮流转移比快速仿真分析是电网安全稳定运行的重要保证。针对现有实际运行方式中潮流转移分析困难问题,提出大规模电力系统潮流转移比多核并行批处理方法。该方法基于广泛使用的商业大系统分析工具,在参数解析分类、故障自动设置及结果解析的基础上,引入深度优先搜索(depth first search,DFS)算法进行孤立节点和孤岛区域检测以保证网络完整性,结合潮流计算合理性的自动判别以实现潮流转移比的批处理分析;同时在多核环境下,构建基于Fork/Join的并行框架,采用"分治模式"递归分解计算任务,从而实现分析方法的多核并行。算例仿真和在云南电网的实际应用验证了所提方法的有效性和快速性。展开更多
The semantic of JOIN in workflow process definition language WPDL is analyzed and studied. It points outthat there is a problem about AND-JOIN. To solve the problem, the synchronized semantic of AND-JOIN in extend-ed ...The semantic of JOIN in workflow process definition language WPDL is analyzed and studied. It points outthat there is a problem about AND-JOIN. To solve the problem, the synchronized semantic of AND-JOIN in extend-ed Xinpai-driven model is defined formally. It puts forward the concepts of synchronizedarea and asynchronizedarea. It gives the solution of true-and-false token rules in synchronized area and true token rules in asychronized area,and some other issues arisen from the solution are studied systematically and completely. The constrain issues of con-trol structures in synchronized area and asynchronized area are discussed, and its solution is put forward. Finally, thealgorithm of how to find the focus point and synchronized area is given.展开更多
基金the National Key R&D Program of China(Grant No.2017YFA0303800)the National Natural Science Foundation of China(Grant Nos.91850205 and 11974046)。
文摘The quantum search on the graph is a very important topic.In this work,we develop a theoretic method on searching of single vertex on the graph[Phys.Rev.Lett.114110503(2015)],and systematically study the search of many vertices on one low-connectivity graph,the joined complete graph.Our results reveal that,with the optimal jumping rate obtained from the theoretical method,we can find such target vertices at the time O(√N),where N is the number of total vertices.Therefore,the search of many vertices on the joined complete graph possessing quantum advantage has been achieved.
文摘Silicon nitride composite is joined to itself by heating interlayer of Y2 O3 -AL2O3 -SiO2 mixtures above their liquidus temperatures in flowing nitrogen. The joined specimens are tested in four point flexure from room temperature to 1373 K. The interface microstruclure and fractured surfaces after testing are observed and analyzed by SEM, EPMA and XRD respectively. The results show that F2 O3 -A12 O3 -SiO2 glass reacts with Si3 N4 at interface, forming the Si3 N4/Si2 N2 O( Y-AlrSi-O-N glass/ Y-Al- Si-O glass gradient interface. With the increase of bonding temperature and holding time, the joint strength first increases, reaching a peak, and then decreases . According to interfacial analyses , the bonding strength depends on joint thickness .
基金financially sponsored by the US Department Energy Vehicle Technologies Office, as part of the Joining Core Programmanaged by UT-Battelle LLC for the US Department of Energy under Contract DE-AC05-00OR22725。
文摘A new testing methodology was developed to quantitively study galvanic corrosion of AZ31B and thermoset carbon-fiber–reinforced polymer spot-joined by a friction self-piercing riveting process.Pre-defined areas of AZ31B in the joint were exposed in 0.1 M NaCl solution over time.Massive galvanic corrosion of AZ31B was observed as exposure time increased.The measured volume loss was converted into corrosion current that was at least 48 times greater than the corrosion current of AZ31B without galvanic coupling.Ninety percent of the mechanical joint integrity was retained for corroded F-SPR joints to 200 h and then decreased because of the massive volume loss of AZ31B。
文摘Green and low carbon promote the application and development of light-weight materials in body-in-white. Large-scale die-casting Al alloy (DCAA) and high-strength thermo-formed steel sheet (TFSS) have put forward higher requirements for the application of joining technology of high-strength steel/Al dissimilar materials. Taking the new die-casting Al alloy body as an example, this paper systematically studies the progress of the latest joining methods of steel/Al dissimilar material with combination of two-layer plate and three-layer plate. By analyzing the joining technologies such as FSPR, RES, FDS and SPR, the technology and process characteristics of steel/Al dissimilar material joining are studied, and the joining technical feasibility and realization means of different material combination of the body are analyzed. The conditions of material combination, material thickness, material strength, flange height, preformed holes and joint spacing for achieving high-quality joining are given. The FSPR joining technology is developed and tested in order to meet with the joining of parts with DCAA and TFSS, especially for the joining of three-layer plates with them. It finds the method and technical basis for the realization of high quality joining of dissimilar materials, provides the early conditions for the application of large DCAA and TFSS parts in body-in-white, and meets the design requirements of new energy body. .
文摘Editor’s notes: Now, the E.B of CHINA AUTO has been moved to Beijing Operations of CATARC (also named Beijing CATARC Automotive Technology Development Co., Ltd.). With the purpose of giving you further information on CATARC and its Beijing branch, and for more convenience on concerned business now and then, we show you their brief introduction. Hope CATARC could act as a bridge of automotive industry both inside and outside.
文摘BORN to a poor farmer’s family at Yangxi Village, Yeping Town, Ruijin County (today’s Ruijin City) of Jiangxi Province in 1914, I was sent to the Lius to be a child daughter-in-law. The Lius were too poor to support themselves. They had nothing but two sons. Worried about not having enough money to purchase a daughter-in-law in the future, the family accepted me as a child daughter-in-law-to-be. I was told by my elders that when I was three years old, I went with my father-in-law to beg. On the way, I was bitten by a rich family’s dog, causing my mother-in-law to burst into tears. My father-in-law died before long, leaving his wife, two sons and I with nothing to live on. With an uncle-in-law
基金Anadolu University(Eskisehir,Turkey)for financial support by BAP-030217 project.
文摘Joining is a crucial process for the production of complex-shaped advanced engineering materials.Deep understanding of ceramic–metal interfaces during joining or following heat-treatment steps is therefore of important concern in designing the new systems.Capacitor discharge joining(CDJ)method was firstly carried out to compose the ceramic–metal joint material by silicon nitride(Si3N4)–titanium(Ti)constituents.Afterwards,heat treatment was performed on the Si3N4-Ti joints in air atmosphere at 1000℃temperature to reveal the interface reactions and phases.Reaction layer that occurred between the Si3N4 and Ti interfaces and new phase formations were examined by transmission electron microscopy(TEM)-based various imaging and chemical analysis techniques.Electron transparent samples for TEM characterization were prepared by focused ion beam(FIB)milling and lifting method.Based on the detailed TEM results,Si and N diffusion arising from the Si3N4 ceramic was observed towards Ti metal foil side and further interacted with Ti atoms.The upshot of current diffusion was that Ti3N2 reaction layer with 50 nm thickness was formed at the interface while titanium silicon nitride(Ti6Si3N)matrix phase including dendritic-shaped Ti2 N grains occurred in the Ti interlayer.It is believed that our TEM-based microscopy results not only provide the knowledge on ceramic–metal joint materials by CDJ method,but also contribute new insights on the development of various new joint systems.
基金supported by the European FP7 project“PROAIR”(No.PIAPP-GA-2013-612415)the Horizon 2020 project“MULTISURF”(Marie Sklodowska-Curie grant agreement No 645676)+3 种基金the DAAD financial support in the form of an International Travel Grant,which enabled her to attend the International Conference on Surface Modification Technologies 33(SMT-33)the support of the National Council for Scientific and Technological Development(CNPq Brazil,Process 200694/2015-4)the financial support from the Austrian aviation program“TAKE-OFF”from the Austrian Ministry for Climate Action,Environment,Energy,Mobility,Innovation and Technology,BMK。
文摘Layered double hydroxide(LDH)conversion coatings loaded with corrosion inhibitors were suggested for the surface treatment of the aluminum alloy 2024-T3,prior to friction spot joining with carbon-fiber reinforced polyphenylene sulfide(AA2024-T3/CF-PPS).Vanadate was used as a model corrosion inhibitor.Lap shear testing method revealed an increase of approx.20%of the joint’s adhesion performance when treated with LDH and before exposure to salt spray.The evaluation of the joints after exposure to salt spray demonstrated a significant difference in the corrosion behavior of the joints when the AA2024-T3 is treated with LDH loaded with nitrate and vanadate species.The LDH intercalated with nitrate revealed a clear improvement in the mechanical and corrosion resistance performance of the joints,even after 6 weeks of salt spray.However,the LDH intercalated with vanadate failed in providing protection against corrosion as well as preserving the mechanical properties of the joints.The effect of the galvanic corrosion was further investigated by zero resistance ammeter(ZRA)measurements as well as localized scanning vibrating electrode technique(SVET).
文摘Ⅰ.Decide whether the following statementsare True or False:1.If a speaker wants to give the same amountof importance to the joined constituents ofthe sentence,he uses the way of subordina-
文摘实现各类预想故障下潮流转移比快速仿真分析是电网安全稳定运行的重要保证。针对现有实际运行方式中潮流转移分析困难问题,提出大规模电力系统潮流转移比多核并行批处理方法。该方法基于广泛使用的商业大系统分析工具,在参数解析分类、故障自动设置及结果解析的基础上,引入深度优先搜索(depth first search,DFS)算法进行孤立节点和孤岛区域检测以保证网络完整性,结合潮流计算合理性的自动判别以实现潮流转移比的批处理分析;同时在多核环境下,构建基于Fork/Join的并行框架,采用"分治模式"递归分解计算任务,从而实现分析方法的多核并行。算例仿真和在云南电网的实际应用验证了所提方法的有效性和快速性。
文摘The semantic of JOIN in workflow process definition language WPDL is analyzed and studied. It points outthat there is a problem about AND-JOIN. To solve the problem, the synchronized semantic of AND-JOIN in extend-ed Xinpai-driven model is defined formally. It puts forward the concepts of synchronizedarea and asynchronizedarea. It gives the solution of true-and-false token rules in synchronized area and true token rules in asychronized area,and some other issues arisen from the solution are studied systematically and completely. The constrain issues of con-trol structures in synchronized area and asynchronized area are discussed, and its solution is put forward. Finally, thealgorithm of how to find the focus point and synchronized area is given.
