Rapid E-Learning即将引领新时代

传统e-Learning因其周期长、耗费大、开发难等缺陷受到越来越多的质疑,Rapid e-Learning的出现恰好迎合了很多企业单位以及教育机构的需求。本文主要从Rapid e-Learning的特性出发,就其适用领域、实现方式、课程开发过程等进行了系统的研究,并认为随着金融危机、云时代的来临以及教育信息化发展需要,Rapid e-Learning必将掀起新的浪潮。     

Rapid dendrite growth in quaternary Ni-based alloys

Dendritic growth is one of the most common micro-structural formation mechanisms during crystal growth. Its morphology provides the kinetics information of crystal growth. Therefore, it is valuable to perform the research on rapid dendrite growth in order…     

Rapid Measurement of Short Fiber Content on Hertel Sample

This paper offers a new method of measuring short fiber content of cotton fibers. The method is composed of two parts： one is Hertel sampling and the other is image testing. With the help of fiber mixer, a thin and even cotton net is obtained on which we can get Hertel sample by using a sliver clamp. The near micro optical mechanism consists of one large area CCD and one lens with long focus. This mechanism is able to measure every cotton fiber of the test beard accurately and makes it possible to measure accumulating fibers＇ amounts. On this base we can calculate short fiber content of cotton, and the experiment results show that this method is efficient.     

Rapid monotecticsolidincation during free fall in a drop tube

Droplets of Ni-31.4%Pb monotectic alloy with different sizes are rapidly solidified during free fall in a drop tube. The theoretical calculations indicate that the undercooling was achieved before solidification exponentially depends on droplet diameter. The maximum undercooling of 241 K (0.15Tm) is obtained in the experiments. With the increase of undercooling, the volume fraction of monotectic cells increases, and the L2(Pb) grains are refined. Calculations of the nucleation rates of L2(Pb) and a-Ni phases indicate that L2(Pb) phase acts as the leading nucleation phase during the monotectic transformation.     

Rapid Prototyping and Manufacturing Technology and Its Integration with CIMS

ＲａｐｉｄＰｒｏｔｏｔｙｐｉｎｇａｎｄＭａｎｕｆａｃｔｕｒｉｎｇＴｅｃｈｎｏｌｏｇｙａｎｄＩｔｓＩｎｔｅｇｒａｔｉｏｎｗｉｔｈＣＩＭＳ￥ＷａｎｇＪｉａｎｇｕｏ，ＹａｎＹｏｎｇｎｉａｎ，ＤｕＺｈａｏｈｕｉ王建国，颜永年，杜昭辉（Ｄｅｐａｒｔｍｅｎｔｏｆ...     

Rapid growth of FeAl intermetallic compound under high undercooling conditions

Fe-58at%Al alloy is undercooled up to 222K (0.15TL) with the drop tube technique.It is found that there exists a critical undercooling about 185 K,beyond which a “dendrite-equiaxed” growth morphology transition occurs in FeAl intermetallic compound. This transition is characterized by sharp decrease of its grain size.Once the undercooling exceeds 215 K, the peritectic transformation is suppressed completely and a fibrous structure is formed,which results from the cooperative growth of FeAl and FeAl2 compounds.     

Rapid monotectic solidification during free fall in a drop tube

Droplets of Ni-31.4%Pb monotectic alloy with different sizes are rapidly solidified during free fall in a drop tube. The theoretical calculations indicate that the undercooling was achieved before solidification exponentially depends on droplet diameter. The maximum undercooling of 241 K (0.15Tin) is obtained in the experiments. With the increase of undercooling, the volume fraction of monotectic cells increases, and the L2(Pb) grains are refined. Calculations of the nucleation rates of L2(Pb) and α-Ni phases indicate that L2(Pb) phase acts as the leading nucleation phase during the monotectic transformation.     

Rapid growth of primary dendrite in highly undercooled copper-antimany alloy

The droplets of Cu-11wt.%Sb hypoeutectic alloy have been rapidly solidified during containerless processing in a 3 m drop tube. The undercooling and cooling rates are estimated, and both play a dominant role in the dendritic growth of primary Cu phase. Undercoolings up to 200 K (0.16TL, where TL is the liquidus temperature) have been obtained in the experiment. With the increase of undercooling, the microstructural evolution of primary Cu phase proceeds from remelted dendrites to the equiaxed grains. A coarse dendritic grain microstructure can form in the undercooling range of 61～102 K and at cooling rates of 1.35×102～2.66×103 K/s. The segregationless solidification of Cu-11wt.%Sb hypoeutectic alloy occurs when undercooling is more than 176 K. The growth of primary Cu phase is mainly controlled by solute diffusion.     

Study of Mechanical Product Rapid Design Based on Knowledge Engineering

This paper proposes a mechanical product intelligent rapid design approach based on integrated technologies. Adopting knowledge based engineering to reuse and manage product design knowledge, and combining feature modeling and parametric design based on existing CAD/CAE/CAM system and technology of product family modeling and engineering database, the system establishes a product family knowledge base, which mainly including product family case base and rule base. The system also utilizes WEB technology to let customers to individually customize products remotely through internet. And an applicable example is given in the end.     

Rapid texture measurement of annealed aluminum sheet based on X-ray diffraction

The structural parameters of materials have been determined commonly by different static and destructive methods, i.e. spot check out of production line. These methods have low efficiency and high randomness, and therefore they cannot be applied to the whole-length examination and inspection of materials properties on production lines. The radial detecting technology of material texture is one of the most important methods to implement rapid structural examination, with which certain material properties could also be on-line determined. The     

Rapid cold hardening process of insects and its ecologically adaptive significance

In contrast to overwintering cold hardening, a rapid cold hardening process has recently been described in insects. This process can rapidly enhance cold tolerance of insects in several hours or even minutes. The characteristics of rapid cold hardening include inducing conditions, cold hardening effects, and fitness costs. Physiological and biochemical mechanisms of rapid cold hardening include rapid changes in the phospholipid composition and the increase in hemolymph osmolalities, polyols production, proline and cold-induced proteins. Moreover, there are different views about the ecologically adaptive significance of rapid cold hardening in insects. This paper reviews research results about rapid cold hardening of insects since 1987, focusing on forms of cold injury, strategies of cold tolerance, and definitions, characteristics, physiological and biochemical mechanisms and adaptive significance of rapid cold hardening.     

Development of a Support Tool for Rapid Application Integration of CIMS

ＤｅｖｅｌｏｐｍｅｎｔｏｆａＳｕｐｐｏｒｔＴｏｏｌｆｏｒＲａｐｉｄＡｐｐｌｉｃａｔｉｏｎＩｎｔｅｇｒａｔｉｏｎｏｆＣＩＭＳ＊ＦａｎＹｕｓｈｕｎ（范玉顺），ＷｕＣｈｅｎｇ（吴澄）ＤｅｐａｒｔｍｅｎｔｏｆＡｕｔｏｍａｔｉｏｎ，ＴｓｉｎｇｈｕａＵｎｉｖｅｒ...     

A New Process and Technology for Rapid Prototyping of A μ-Micro Motor

A new process and technology of rapid prototyping for a μ-micro motor is presented as a nontraditional machining and an advanced manufacturing technology (AMT) to be realized by using masks, including the operation principle of the motor, structure design, technique, driven circuit, and quality examination with Raman spectrum. The μ-micro motor is fabricated by the micro electro-mechanical systems (MEMS) process, the structure design must be considered to fabricate or assembly the parts during machining the motor in the meantime. The research proved that integration of IC (integrated circuit) process and MEMS using masks is effective in obtaining the rapid prototyping manufacturing of the μ-micro motor. With the mature technique to fabricate the motor, there are advantages to produce the motor in short time and with lower cost than before. The motor is a common power source of micro machines in military and civilian applications, for example, applied to micro robot, micro bio medicine, and micro machine. The size of the motor is 190 μm in maximum diameter by 125 μm in height that is bulk machined in array with the number of hundreds of micro motors on a substrate.     

Rapid point-of-use water purification using nanoscale zero valent iron （nZVI） particles

Nanoscale zero-valent iron （nZVI） particles are increasingly being investigated in removing aqueous contaminants. Here, we have demonstrated its inactivation and magnetic removal of bacteria and endotoxins from environmental wastewater samples. Varying dosages （10-1,000 μL） of 0-6 days aged nZVI with a concentration of 5 mg/mL for 2 mL wastewater samples were tested, and relevant removal efficiencies were determined using culturing method for bacteria and limulus amebocyte lysate （LAL） for endotoxins. The supernatants of wastewater samples after reacting with nZVI and subsequent magnetic separations were subjected to spectroscopic, qPCR and DGGE analysis. Overall, high magnetic bacterial removal efficiencies were observed up to 3-4 logs for 1 mL nZVI, while the removal efficiencies 0.5 log for 10 μL nZVI. qPCR decreased sharply down to and DGGE results revealed that higher dosages of nZVI caused severe bacterial cell membrane ruptures, releasing significant amounts of DNA up to 107-108 gene copies/mL when 1 mL nZVI was used. Richer DGGE patterns were observed for higher nZVI dosages. In addition, regardless of the dosages （10-1,000μL） we have observed more than 90 % removal of endotoxins from the wastewater samples. The described technology has great promise to be used as a point-of-use water purification solution for various purposes.     

A New Process and Technology for Rapid Prototyping of A μ-Micro Motor

A new process and technology of rapid prototyping for a μ-micro motor is presented as a nontraditional machining and an advanced manufacturing technology (AMT) to be realized by using masks, including the operation principle of the motor, structure design, technique, driven circuit, and quality examination with Raman spectrum. The μ-micro motor is fabricated by the micro electro-mechanical systems (MEMS) process, the structure design must be considered to fabricate or assembly the parts during machining the motor in the meantime. The research proved that integration of IC (integrated circuit) process and MEMS using masks is effective in obtaining the rapid prototyping manufacturing of the μ-micro motor. With the mature technique to fabricate the motor, there are advantages to produce the motor in short time and with lower cost than before. The motor is a common power source of micro machines in military and civilian applications, for example, applied to micro robot, micro bio medicine, and micro machine. The size of the motor is 190 μm in maximum diameter by 125 μm in height that is bulk machined in array with the number of hundreds of micro motors on a substrate.     

Rapid Expansion of Supercritical Solution of Poly (1,1,2,2- Tetrahy-droperfluorodecyl Acrylate)

Poly(1,1,2,2- tetrahydroperfluorodecyl acrylate) (poly (TA-N)) was synthesized in laboratory. The resulting morphology of rapid expansion of supercritical solution (RESS) sprays of poly(TA - N) was investigated. At apre - expansion temperature of 45℃), amorphous polymer was formed. At temperature around 60 ℃ to 80 ℃ , fibers were formed. Increase of temperature increasesparticle size slightly. At temperature of 105℃ , most of particles are spheres. The RESS is an attractive process. To apply the polymers desired for coating applications in an organic solvent - free process that is economically viable , and it will have implications for pollution prevention during polymer film formation     

Rapid genome evolution in Pms 1 region of rice revealed by comparative sequence analysis

Pms1, a locus for photoperiod sensitive genic male sterility in rice, was identified and mapped to chromosome 7 in previous studies. Here we report an effort to identify the candidate genes for Pms1 by comparative sequencing of BAC clones from two cultivars Minghui 63 and Nongken 58, the parents for the initial mapping population. Annotation and comparison of the sequences of the two clones resulted in a total of five potential candidates which should be functionally tested. We also conducted com-parative analysis of sequences of these two cultivars with two other cultivars, Nipponbare and 93-11, for which sequence data were available in public databases. The analysis revealed large differences in sequence composition among the four genotypes in the Pms1 region primarily due to retroelement activity leading to rapid recent growth and divergence of the genomes. High levels of polymorphism in the forms of indels and SNPs were found both in intra- and inter-subspecific comparisons. Dating analysis using LTRs of the retroelements in this region showed that the substitution rate of LTRs was much higher than reported in the literature. The results provided strong evidence for rapid genomic evolution of this region as a consequence of natural and artificial selection.     

Rapid cooling effect during solidification on macro-and micro-segregation of as-cast Mg–Gd alloy

The high performance of as-cast Mg-RE alloys is always related to their high RE additions.However,RE elements can be readily segregated in Mg alloys and the segregation becomes more significant with the increasing RE content.In this research,the effect of cooling rate on the macro-and micro-segregation in the as-cast Mg-8 Gd alloy was studied.The Gd content at the bottom of the fabricated ingot with the cooling rate of 4.6-6.9℃/s was～1.7 times of that at the top and coarse eutectics as well as some non-equilibrium phases of α-Gd,MgGd,Mg_2 Gd were distributed along the grain boundaries.The formation mechanisms of the specific gravity segregation and grain boundary segregation were also proposed.Upon the application of the water-cooled copper mold with the cooling rate of 27-200℃/s,only fine Mg5 Gd and some nanoscale metastable β_1 and β' phases were found to disperse uniformly in the grain interior,thus the homogeneity of the composition,microstructure,and performance within the whole ingot was considerably improved.It is expected that these results will facilitate the processing design for the fabrication of the highly-homogenized Mg-RE alloy castings.     

Application and Realization of Rapid Searching Technology in the RL & SM Universal Fixture System

ＩｎｔｒｏｄｕｃｔｉｏｎＩｎｍａｎｕｆａｃｔｕｒｉｎｇｓｙｓｔｅｍｓ,ｅｎｇｉｎｅｅｒｓａｒｅｍｕｃｈｃｏｎｃｅｒｎｅｄｗｉｔｈｔｈｅｗｏｒｋ ｐｉｅｃｅｉｎｓｔａｌｌａｔｉｏｎｐｒｏｂｌｅｍｓ ,ｅｓｐｅｃｉａｌｌｙｉｎｔｈｅｐｒｏ ｄｕｃｔｉｏｎｏｆｓｍａｌｌｑｕａｎｔｉｔｙｗｉｔｈｈｉｇｈｖａｒｉｅｔｉｅｓｏｒｉｎｔｈｅｔｒｉａｌ ｍａｎｕ ｆａｃｔｕｒｅｏｆａｎｅｗｐｒｏｄｕｃｔ.Ｉｎｐａｐｅｒ[1],ｎｏｎ ｔｒａｄｉｔｉｏｎａｌｉｎｓｔａｌｌａｔｉｏｎｔｅｃｈｎｏｌｏｇｙｗａｓｐｕｔｆｏｒｗａｒ…     

Rapid solidification mechanism of Ag60Sb34Cu6 ternary alloy in drop tube

Ternary eutectic growth involves competitive nu-cleation and growth of three solids from one liquid. Thesolidification behavior of ternary eutectic alloy is morecomplex than that of binary eutectic alloy due to the addi-tion of the third component[1—4]. Up to now, most scientificinvestigations on ternary eutectic alloy focus on the influ-ence of changing the component or adding a fourth even afifth element on the performance of the alloy[5—8]. How-ever, the information on crystal growth char…