In order to rapidly respond to the complex and mutational market, a new facility layout plan based on cellular manufacturing is proposed, which gives consideration to high efficiency and flexibility. The plan designs ...In order to rapidly respond to the complex and mutational market, a new facility layout plan based on cellular manufacturing is proposed, which gives consideration to high efficiency and flexibility. The plan designs two phases of integrated cell layout, i.e., cell construction and cell system layout, on the condition of adding/removing machines. First, in view of the costs of logics and machine-relocation, the cell construction based on the alternative processing routes and intra-cell layout are integrated as a whole, which achieves cell formation, process planning and the intra-cell layout in a single step. Secondly, an approach of a continuous optimized multi-line layout for solving the cell system layout problem is proposed, which eliminates the coupling relationship from the machine-relocation and realizes an integrated design of the two phases of the cell layout. An application based on real factory data is optimally solved by the Matlab 7.0 software to validate and verify the models.展开更多
For at least the past five decades,structural synthesis has been used as a main means of finding better mechanisms with some predefined function.In structural synthesis,isomorphism identification is still a problem un...For at least the past five decades,structural synthesis has been used as a main means of finding better mechanisms with some predefined function.In structural synthesis,isomorphism identification is still a problem unsolved well,and to solve this problem is very significant to the design of new mechanisms.According to the given degree of freedom(DOF) and link connection property of planar closed chain mechanisms,vertex assortment is obtained.For solving the isomorphism problem,a method of the adding sub-chains is proposed with the detailed steps and algorithms in the synthesizing process.Employing this method,the identification code and formation code of every topological structure are achieved,therefore many isomorphic structures could be eliminated in time during structural synthesis by comparing those codes among different topological graphs,resulting in the improvement of synthesizing efficiency and accuracy,and the approach for eliminating rigid sub-chains in and after the synthesizing process is also presented.Some examples are given,including how to add sub-chains,how to detect simple rigid sub-chains and how to obtain identification codes and formulation codes et al.Using the adding sub-chain method,the relative information of some common topological graphs is given in the form of table.The comparison result is coincident with many literatures,so the correctness of the adding sub-chain method is convinced.This method will greatly improve the synthesizing efficiency and accuracy,and has a good potential for application.展开更多
The change of conductivity and transparency of silver nanowire (AgNW) films by adding silver nano-particles (AgNPs) onto their surface is studied. The results show that the conductivity of the AgNW film is greatly...The change of conductivity and transparency of silver nanowire (AgNW) films by adding silver nano-particles (AgNPs) onto their surface is studied. The results show that the conductivity of the AgNW film is greatly improved with its sheet resistance reduced about 78. 7% to 51.9Ω/sq, and there is no obvious reduction of the transmittance. Further studies show that there is a self-assembling process pushing the AgNPs to concentrate at the intersecting points between AgNWs to weld them, which would reduce the intersection resistance between the AgNWs. This self-assembling behavior is led by the surface interactivities among the dispersing liquid of AgNPs, the surface of the substrate and AgNWs when the dispersing liquid is drying.展开更多
In this letter the scaling properties of the period-adding sequences in a so-called“multiple Devil’s staircase”are reported.It is certified both analytically and numerically that the width of the i-th phase-locked ...In this letter the scaling properties of the period-adding sequences in a so-called“multiple Devil’s staircase”are reported.It is certified both analytically and numerically that the width of the i-th phase-locked plateau in a sequence scales as In|Δe(i)|∝i,and the position of the plateau scales as In|e_(∞)-e_(i)|∝i.These properties are qualitatively different from those of the period-adding sequences in conventional Devil’s staircases.展开更多
The period-adding phenomena in a two dimensional mapping with three parameters have been discussed.It has been found that the period-doubling bifurcations do not appear.
Local climate conditions and sowing time are very important to the vernalization and summer reproduction of the wheat. Xundian County is located in Yunnan Province of China, at latitude 25.56° north and longitude...Local climate conditions and sowing time are very important to the vernalization and summer reproduction of the wheat. Xundian County is located in Yunnan Province of China, at latitude 25.56° north and longitude 103.25° east. Xundian County is situated 1 873 m above sea level, and is conducive for the summer reproduction of the wheat. To investigate the optimal sowing time, 11 spring wheat cultivars and one semi-winter wheat cultivar were sown 10 times at an interval of fi ve days from May 26, 2012, and the strong winter wheat Suyin 10 was treated in a vernalization room at 2℃ with different concentrations of the gibberellin and 5-azacytidine. The results showed that Suyin 10 should be vernalized at 2℃ for 30 days in summer, and the growth periods of strong winter wheat plants could been shortened if treated with a specifi c concentration of the gibberellin and 5-azacytidine at a low temperature. The growth period of the spring wheat in summer reproduction was delayed, and their agronomic traits gradually decreased with the passage of the sowing time. Thus, spring wheat should be sown at the earliest time possible for better yield. June 25 should be the latest date for summer reproduction of the wheat, but the semi-winter wheat cultivars in Xundian County should be added generation in summer after being treated at 2℃ for 10 days. Xundian County is a suitable location for summer reproduction of the wheat in China.展开更多
The quality of mischmetal wire and rod and the method of adding rare earth into steel are quite important for making high quality steel. This paper proposes a quality specification of wire and rod as well as related a...The quality of mischmetal wire and rod and the method of adding rare earth into steel are quite important for making high quality steel. This paper proposes a quality specification of wire and rod as well as related adding method. The paper also provides principles for selecting raw material and adding method.展开更多
Expressions of dispersion relation and propagation power are presented for the nonlinear transverse-electric(TE)waves in a two-core optical waveguide with a nonlinear cladding.The properties of the nonlinear TE waves ...Expressions of dispersion relation and propagation power are presented for the nonlinear transverse-electric(TE)waves in a two-core optical waveguide with a nonlinear cladding.The properties of the nonlinear TE waves are analyzed.It is found that when the total core thickness and the distance between the two cores are sufficiently large,the power curves of the higher odd modes become very sharp in some narrow ranges of the effective refractive index,compared with those of the higher even modes.展开更多
A test of the adding up condition in demand systems is crucial for determining whether a share format is admissible when the number of sample goods is smaller than the number of commodity choices available to consumer...A test of the adding up condition in demand systems is crucial for determining whether a share format is admissible when the number of sample goods is smaller than the number of commodity choices available to consumers. This test requires the estimation of a demand system in a quantity format. It cannot be performed when a demand system is specified in share format. The share specification of any demand system is like a straight jacket: once worn, it forces the error covariance matrix to be singular and the adding up condition to hold whether or not the data generating process warrants it. The empirical verification of the adding up hypothesis uses a five-commodity sample selected from the Canadian Family Expenditure Survey with 4847 observations. Three specifications are considered: AIDS (Almost Ideal Demand System), QUAIDS (Quadratic AIDS) and EASI (Exact Affine Stone Index). The hypothesis is rejected in all three cases with a high level of confidence.展开更多
We propose a new scheme on modulating the lasing performance of a quantum dot-cavity system. Compared to the conventional above-band pump, in our new scheme an additional resonant driving field is applied on the quant...We propose a new scheme on modulating the lasing performance of a quantum dot-cavity system. Compared to the conventional above-band pump, in our new scheme an additional resonant driving field is applied on the quantum dot-cavity system. By employing the master equation theory and the Jaynes-Cummings model, we are able to study the interesting phenomenon of the coupling system. To compare the different behaviors between using our new scheme and the conventional method,we carry out investigatioin for both the 'good system'and 'more realistic system', characterizing several important parameters, such as the cavity population, exciton population and the second-order correlation function at zero time delay. Through numerical simulations,we demonstrate that for both the good system and more realistic system, their lasing regimes can be displaced into other regimes in the presence of a resonant driving field.展开更多
Mono-, di-, tri-ethanolamines and di-, tri-ethylamines were used to prepare phosphate buffer at pH 2.5 and shown to be capable of enhancing the separation selectivity of chiral drug pinacidil and melittin in bee venom...Mono-, di-, tri-ethanolamines and di-, tri-ethylamines were used to prepare phosphate buffer at pH 2.5 and shown to be capable of enhancing the separation selectivity of chiral drug pinacidil and melittin in bee venom in capillary zone electrophoresis. The reason is due to the reduction of the average apparent mobilities of the analytes.展开更多
The 2021 China International Fair on Trade in Services(CIFTIS)held last September has drawn worldwide attention.As the largest comprehensive exhibition in the field of global trade in services,the fair sent the world ...The 2021 China International Fair on Trade in Services(CIFTIS)held last September has drawn worldwide attention.As the largest comprehensive exhibition in the field of global trade in services,the fair sent the world a positive signal for robust recovery with the participation of more than 12,000 companies from 153 countries and regions.The host country China is now on the go to bring its opening-up to a higher level with new measures in the pipeline.The CIFTIS showed participants the huge opportunities of the Chinese market and created a key platform for cooperation and exchanges on trade in services,adding new momentum to the recovery and growth of the world economy and trade.As Chinese President Xi Jinping pointed out in his speech at the CIFTIS.展开更多
China and Africa finding new ways to drive all aspects of mutual development A total of 210 orphans in the three states around Abuja,capital of Nigeria,went to a summer camp to celebrate the country’s Children’s Day...China and Africa finding new ways to drive all aspects of mutual development A total of 210 orphans in the three states around Abuja,capital of Nigeria,went to a summer camp to celebrate the country’s Children’s Day on May 27.Huawei Technologies Co.,a leading global information and communications technology solutions provider from China,sponsored the event.展开更多
THE thunderous roar of water falling over Victoria Falls had to compete with a swarm of politicians who descended on Zimbabwe's tourist haven in mid-August 2014. Heads of state and leaders from Southern African Devel...THE thunderous roar of water falling over Victoria Falls had to compete with a swarm of politicians who descended on Zimbabwe's tourist haven in mid-August 2014. Heads of state and leaders from Southern African Development Community (SADC) countries were there to attend the 34th SADC Heads of State and Government Summit. Under the theme “SADC Strategy for Economic Transformation: Leveraging the Region's Diverse Resources for Sustainable Economic and Social Development through Beneficiation and Value Addition.” the summit was opened by newly appointed chairman of SADC. Zimbabwe's President Robert Mugabe.展开更多
OAR es Salaam's skyline has been forever changed with the construction of the city's impressive 22-story building, bringing a modern edge to Tanzania's capital. Undertaken by China Civil Engineering Construction Co...OAR es Salaam's skyline has been forever changed with the construction of the city's impressive 22-story building, bringing a modern edge to Tanzania's capital. Undertaken by China Civil Engineering Construction Corp. (CCECC). the building took just two years to build and was completed in November 2013. However, it also took the company two years to win the bid.展开更多
As a historical city rich in cultural heritage, Chaoyang is doing its utmost to protect, preserve and promote its culture FOR years iron ore was mined from the Niuheliang area,several kilometers from Chaoyang City in ...As a historical city rich in cultural heritage, Chaoyang is doing its utmost to protect, preserve and promote its culture FOR years iron ore was mined from the Niuheliang area,several kilometers from Chaoyang City in northeast Chi-na’s Liaoning Province. The high-grade iron ore from the展开更多
For decades,a powerful approach to adding data capacity in an optical communication link has been to multiplex independent data-carrying channels and transmit them simultaneously along a fiber.^(1)For example,waveleng...For decades,a powerful approach to adding data capacity in an optical communication link has been to multiplex independent data-carrying channels and transmit them simultaneously along a fiber.^(1)For example,wavelength-division-multiplexing(WDM)was a key technology in the 1990s and early 2000s to dramatically increase aggregate capacity in a fiber by multiplexing beams of different wavelengths.^(2)For the past roughly 15 years,there has been great promise that space-division-multiplexing(SDM)may bring similar capacity enhancements to optical fiber communications.^(1–3)展开更多
文摘In order to rapidly respond to the complex and mutational market, a new facility layout plan based on cellular manufacturing is proposed, which gives consideration to high efficiency and flexibility. The plan designs two phases of integrated cell layout, i.e., cell construction and cell system layout, on the condition of adding/removing machines. First, in view of the costs of logics and machine-relocation, the cell construction based on the alternative processing routes and intra-cell layout are integrated as a whole, which achieves cell formation, process planning and the intra-cell layout in a single step. Secondly, an approach of a continuous optimized multi-line layout for solving the cell system layout problem is proposed, which eliminates the coupling relationship from the machine-relocation and realizes an integrated design of the two phases of the cell layout. An application based on real factory data is optimally solved by the Matlab 7.0 software to validate and verify the models.
基金supported by National Natural Science Foundation of China (Grant No. 51075079)National Hi-tech Research and Development Program of China(863 Program,Grant No. 2008AA04Z202)
文摘For at least the past five decades,structural synthesis has been used as a main means of finding better mechanisms with some predefined function.In structural synthesis,isomorphism identification is still a problem unsolved well,and to solve this problem is very significant to the design of new mechanisms.According to the given degree of freedom(DOF) and link connection property of planar closed chain mechanisms,vertex assortment is obtained.For solving the isomorphism problem,a method of the adding sub-chains is proposed with the detailed steps and algorithms in the synthesizing process.Employing this method,the identification code and formation code of every topological structure are achieved,therefore many isomorphic structures could be eliminated in time during structural synthesis by comparing those codes among different topological graphs,resulting in the improvement of synthesizing efficiency and accuracy,and the approach for eliminating rigid sub-chains in and after the synthesizing process is also presented.Some examples are given,including how to add sub-chains,how to detect simple rigid sub-chains and how to obtain identification codes and formulation codes et al.Using the adding sub-chain method,the relative information of some common topological graphs is given in the form of table.The comparison result is coincident with many literatures,so the correctness of the adding sub-chain method is convinced.This method will greatly improve the synthesizing efficiency and accuracy,and has a good potential for application.
文摘The change of conductivity and transparency of silver nanowire (AgNW) films by adding silver nano-particles (AgNPs) onto their surface is studied. The results show that the conductivity of the AgNW film is greatly improved with its sheet resistance reduced about 78. 7% to 51.9Ω/sq, and there is no obvious reduction of the transmittance. Further studies show that there is a self-assembling process pushing the AgNPs to concentrate at the intersecting points between AgNWs to weld them, which would reduce the intersection resistance between the AgNWs. This self-assembling behavior is led by the surface interactivities among the dispersing liquid of AgNPs, the surface of the substrate and AgNWs when the dispersing liquid is drying.
基金Supported by the National Natural Science Foundation of China under Grant No.19575037.
文摘In this letter the scaling properties of the period-adding sequences in a so-called“multiple Devil’s staircase”are reported.It is certified both analytically and numerically that the width of the i-th phase-locked plateau in a sequence scales as In|Δe(i)|∝i,and the position of the plateau scales as In|e_(∞)-e_(i)|∝i.These properties are qualitatively different from those of the period-adding sequences in conventional Devil’s staircases.
基金the Science Fund of the Chinese Academy of Science.
文摘The period-adding phenomena in a two dimensional mapping with three parameters have been discussed.It has been found that the period-doubling bifurcations do not appear.
基金the National Natural Science Foundation of China(31000712)
文摘Local climate conditions and sowing time are very important to the vernalization and summer reproduction of the wheat. Xundian County is located in Yunnan Province of China, at latitude 25.56° north and longitude 103.25° east. Xundian County is situated 1 873 m above sea level, and is conducive for the summer reproduction of the wheat. To investigate the optimal sowing time, 11 spring wheat cultivars and one semi-winter wheat cultivar were sown 10 times at an interval of fi ve days from May 26, 2012, and the strong winter wheat Suyin 10 was treated in a vernalization room at 2℃ with different concentrations of the gibberellin and 5-azacytidine. The results showed that Suyin 10 should be vernalized at 2℃ for 30 days in summer, and the growth periods of strong winter wheat plants could been shortened if treated with a specifi c concentration of the gibberellin and 5-azacytidine at a low temperature. The growth period of the spring wheat in summer reproduction was delayed, and their agronomic traits gradually decreased with the passage of the sowing time. Thus, spring wheat should be sown at the earliest time possible for better yield. June 25 should be the latest date for summer reproduction of the wheat, but the semi-winter wheat cultivars in Xundian County should be added generation in summer after being treated at 2℃ for 10 days. Xundian County is a suitable location for summer reproduction of the wheat in China.
文摘The quality of mischmetal wire and rod and the method of adding rare earth into steel are quite important for making high quality steel. This paper proposes a quality specification of wire and rod as well as related adding method. The paper also provides principles for selecting raw material and adding method.
基金Supported by the National Integra ted Optoelec tronics Labora tory of China(No.9605).
文摘Expressions of dispersion relation and propagation power are presented for the nonlinear transverse-electric(TE)waves in a two-core optical waveguide with a nonlinear cladding.The properties of the nonlinear TE waves are analyzed.It is found that when the total core thickness and the distance between the two cores are sufficiently large,the power curves of the higher odd modes become very sharp in some narrow ranges of the effective refractive index,compared with those of the higher even modes.
文摘A test of the adding up condition in demand systems is crucial for determining whether a share format is admissible when the number of sample goods is smaller than the number of commodity choices available to consumers. This test requires the estimation of a demand system in a quantity format. It cannot be performed when a demand system is specified in share format. The share specification of any demand system is like a straight jacket: once worn, it forces the error covariance matrix to be singular and the adding up condition to hold whether or not the data generating process warrants it. The empirical verification of the adding up hypothesis uses a five-commodity sample selected from the Canadian Family Expenditure Survey with 4847 observations. Three specifications are considered: AIDS (Almost Ideal Demand System), QUAIDS (Quadratic AIDS) and EASI (Exact Affine Stone Index). The hypothesis is rejected in all three cases with a high level of confidence.
基金Supported by the National Natural Science Foundation of China under Grant Nos 11274178,61475197 and 61590932the Natural Science Foundation of the Jiangsu Higher Education Institutions under Grant No 15KJA120002+1 种基金the outstanding Youth Project of Jiangsu Province under Grant No BK20150039the Priority Academic Program Development of Jiangsu Higher Education Institutions under Grant No YX002001
文摘We propose a new scheme on modulating the lasing performance of a quantum dot-cavity system. Compared to the conventional above-band pump, in our new scheme an additional resonant driving field is applied on the quantum dot-cavity system. By employing the master equation theory and the Jaynes-Cummings model, we are able to study the interesting phenomenon of the coupling system. To compare the different behaviors between using our new scheme and the conventional method,we carry out investigatioin for both the 'good system'and 'more realistic system', characterizing several important parameters, such as the cavity population, exciton population and the second-order correlation function at zero time delay. Through numerical simulations,we demonstrate that for both the good system and more realistic system, their lasing regimes can be displaced into other regimes in the presence of a resonant driving field.
文摘Mono-, di-, tri-ethanolamines and di-, tri-ethylamines were used to prepare phosphate buffer at pH 2.5 and shown to be capable of enhancing the separation selectivity of chiral drug pinacidil and melittin in bee venom in capillary zone electrophoresis. The reason is due to the reduction of the average apparent mobilities of the analytes.
文摘The 2021 China International Fair on Trade in Services(CIFTIS)held last September has drawn worldwide attention.As the largest comprehensive exhibition in the field of global trade in services,the fair sent the world a positive signal for robust recovery with the participation of more than 12,000 companies from 153 countries and regions.The host country China is now on the go to bring its opening-up to a higher level with new measures in the pipeline.The CIFTIS showed participants the huge opportunities of the Chinese market and created a key platform for cooperation and exchanges on trade in services,adding new momentum to the recovery and growth of the world economy and trade.As Chinese President Xi Jinping pointed out in his speech at the CIFTIS.
文摘China and Africa finding new ways to drive all aspects of mutual development A total of 210 orphans in the three states around Abuja,capital of Nigeria,went to a summer camp to celebrate the country’s Children’s Day on May 27.Huawei Technologies Co.,a leading global information and communications technology solutions provider from China,sponsored the event.
文摘THE thunderous roar of water falling over Victoria Falls had to compete with a swarm of politicians who descended on Zimbabwe's tourist haven in mid-August 2014. Heads of state and leaders from Southern African Development Community (SADC) countries were there to attend the 34th SADC Heads of State and Government Summit. Under the theme “SADC Strategy for Economic Transformation: Leveraging the Region's Diverse Resources for Sustainable Economic and Social Development through Beneficiation and Value Addition.” the summit was opened by newly appointed chairman of SADC. Zimbabwe's President Robert Mugabe.
文摘OAR es Salaam's skyline has been forever changed with the construction of the city's impressive 22-story building, bringing a modern edge to Tanzania's capital. Undertaken by China Civil Engineering Construction Corp. (CCECC). the building took just two years to build and was completed in November 2013. However, it also took the company two years to win the bid.
文摘As a historical city rich in cultural heritage, Chaoyang is doing its utmost to protect, preserve and promote its culture FOR years iron ore was mined from the Niuheliang area,several kilometers from Chaoyang City in northeast Chi-na’s Liaoning Province. The high-grade iron ore from the
文摘For decades,a powerful approach to adding data capacity in an optical communication link has been to multiplex independent data-carrying channels and transmit them simultaneously along a fiber.^(1)For example,wavelength-division-multiplexing(WDM)was a key technology in the 1990s and early 2000s to dramatically increase aggregate capacity in a fiber by multiplexing beams of different wavelengths.^(2)For the past roughly 15 years,there has been great promise that space-division-multiplexing(SDM)may bring similar capacity enhancements to optical fiber communications.^(1–3)