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复合式基层长寿命沥青路面承载能力分析 被引量:1
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作者 屈真 《交通世界》 2012年第3期263-264,共2页
长期以来,强基薄面的思想一直主导着我国沥青路面的设计,由此,半刚性基层沥青路面成为我国高等级沥青路面的主要结构型式。然而,近年来,以半刚性基层沥青路面为主的高等级公路早期破坏现象越来越严重,
关键词 长寿命沥青路面 半刚性层沥青路面 力分析 合式基 高等级沥青路面 承载 高等级公路 薄面
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混合式基层沥青路面的结构设计方法
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作者 朱宇利 《交通世界》 2014年第29期10-11,共2页
随着机动车超载现象越来越严重,半刚性基层路面逐渐暴露出其具有的缺点来。复合式基层沥青路面结构是将半刚性基层以及柔性基层结合在一起构成的路面结构类型。组合之后,混合式基层和沥青层同时成为承重层,这样就大大减少了沥青路面... 随着机动车超载现象越来越严重,半刚性基层路面逐渐暴露出其具有的缺点来。复合式基层沥青路面结构是将半刚性基层以及柔性基层结合在一起构成的路面结构类型。组合之后,混合式基层和沥青层同时成为承重层,这样就大大减少了沥青路面的损坏程度,延长了沥青道路使用的寿命。 展开更多
关键词 沥青路面结构 结构设计方法 合式基 半刚性层路面 机动车超载现象 结构类型 损坏程度 沥青道路
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复合式基层沥青路面的动力学
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作者 骆新菊 《交通世界》 2012年第9期310-311,共2页
长期以来,"强基薄面"的思想一直主导着我国沥青路面的设计,由此,以此思想为根基的半刚性基层沥青路面也成为我国高等级沥青路面的主要结构型式。然而,近年来,以半刚性基层沥青路面为主的高等级公路早期破坏现象越来越严重,有的甚至在... 长期以来,"强基薄面"的思想一直主导着我国沥青路面的设计,由此,以此思想为根基的半刚性基层沥青路面也成为我国高等级沥青路面的主要结构型式。然而,近年来,以半刚性基层沥青路面为主的高等级公路早期破坏现象越来越严重,有的甚至在通车短短几年内就产生了结构性破坏,需要进行"开膛破肚式"的大修。可见,传统的半刚性路面已在我国重交通、高轴载的条件下暴露出越来越多的缺点。复合式基层沥青路面为当前的主要新型路面结构形式,其主要结构特点为基层采用柔性上基层并在其下下卧半刚性基层。 展开更多
关键词 高等级沥青路面 合式基 半刚性层沥青路面 动力学 结构型 高等级公路 结构性破坏 半刚性路面
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一种基于与(或)逻辑实现的信息分存算法 被引量:3
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作者 邵利平 覃征 衡星辰 《西安交通大学学报》 EI CAS CSCD 北大核心 2006年第10期1078-1082,共5页
针对传统信息分存算法运算量大和计算复杂等问题,通过引入合式基,提出了一种基于与(或)逻辑的信息分存新算法.它可通过对合式基进行动态分组来构造不同的信息分发和恢复方案,使算法具有动态自适应能力和可扩展能力,同时利用分发恢复过... 针对传统信息分存算法运算量大和计算复杂等问题,通过引入合式基,提出了一种基于与(或)逻辑的信息分存新算法.它可通过对合式基进行动态分组来构造不同的信息分发和恢复方案,使算法具有动态自适应能力和可扩展能力,同时利用分发恢复过程与加密伪装过程的松耦合性,并结合经典的加密和信息隐藏算法,使算法具有高安全性.实验结果表明,在同一分组内的各个分存子信息的恢复能力相同,不同分组可负责恢复分发信息的不同部分,但恢复能力不同.若分组内仅有一个合式基,则该分组内对应的分存子信息必须参与信息恢复;若分组内对应的合式基分别参与该分组不同分存子信息的构建过程,在满足约束的情况下,允许分组内若干个分存子信息不参与信息恢复,其结果并不影响分发信息的重构. 展开更多
关键词 信息分存 合式基 信息隐藏 动态分组
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一种基于布尔代数的秘密共享方案
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作者 高洪江 邵利平 +1 位作者 衡星辰 覃征 《计算机工程》 CAS CSCD 北大核心 2007年第6期24-26,共3页
秘密共享方案是在n个参与者之间共享秘密k的方法。将布尔代数中的与或逻辑引入秘密共享而提出的新方案运算速度快,并具有灵活的自适应能力和良好的可扩展性,便于软件编程和硬件固化,可以与经典的加密方法紧密结合,以提高其安全性。
关键词 秘密共享 布尔代数 与或逻辑 合式基 逻辑集
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Comprehensive Pattern of Primordium Initiation in Shoot Apex of Wheat 被引量:2
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作者 李存东 曹卫星 张月辰 《Acta Botanica Sinica》 CSCD 2002年第3期273-278,共6页
The time course of the initiation of different types of apical primordia on the stem of wheat (Triticum aestivum L.) was investigated to establish a comprehensive pattern of apical primordium development and quantitat... The time course of the initiation of different types of apical primordia on the stem of wheat (Triticum aestivum L.) was investigated to establish a comprehensive pattern of apical primordium development and quantitative dynamic relationships among different primordium initiation. The results showed that the initiation of leaf and bracteal primordia took the S shape, and that of spikelet and floret took the rise stage of parabolic shape in relation to GDD (growing degree days after sowing) in wheat. The bracteal was much like vegetative rather than reproductive organ in terms of the dynamic pattern of primordium initiation. The progress of spikelet and floret primordium initiation could well reflect the characteristics of different genotypes and the impact of different ecological environments on wheat apical development. The integrated model of different primordium initiation in shoot of wheat was an S_shaped curvilinear, and could be divided into three sub_models. The number of leaf primordia was affected by both genotype and environment, while the numbers of bracteal, spikelet and floret primordia were affected mainly by environmental factors. Measured with mean thermochron, the rates of initiation of leaf, bracteal and spikelet primordia in normal planting were the highest among all the sowing date treatments. In contrast to the relationships among leaf, bracteal, spikelet and their initiation duration, the correlation between the number of floret and its initiation duration was highly significant. 展开更多
关键词 WHEAT shoot apex primordium initiation comprehensive pattern dynamic characteristics
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A Method for Rapid Salt-extraction of High-quality Genomic DNA from Plant Seeds 被引量:1
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作者 张富丽 刘勇 +4 位作者 宋君 尹全 代晓航 雷绍荣 游米沙 《Agricultural Science & Technology》 CAS 2012年第3期485-488,共4页
[Objective] This study aimed to explore an effective method for rapid salt- extraction of high-quality genomic DNA from dried seeds of plants. [Method] Seeds of seven varieties of crops were ground into powder. A hund... [Objective] This study aimed to explore an effective method for rapid salt- extraction of high-quality genomic DNA from dried seeds of plants. [Method] Seeds of seven varieties of crops were ground into powder. A hundred milligrams of seed powder was added to extracting solution for high salt-extraction of genomic DNA. The yield and quality of extracted DNA were determined by using ultramicro UV/Vis spectrophotometer detection method, PCR and restriction enzyme digestion. [Result] About 619.67-1 811.21 ng of genomic DNA was extracted from per 100 mg of dried seed powder of seven varieties of conventional crops. A260/A280 ratios of the obtained DNA solution all ranged from 1.87 to 2.07, the purity and quality of PCR were suitable for PCR and restriction enzyme digestion. Clear target bands of specific endogenous gene fragments of seven varieties of crops were amplified by PCR, and the obtained DNA could be fully digested with EcoRV and Hindlll.[Conclusion] This method could be used for rapid extraction of high-quality genomic DNA from dried seeds. 展开更多
关键词 Genomic DNA Polymerase chain reaction High salt extraction Dried seeds
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Characterization of transgene integration pattern in F4 hGH-transgenic common carp (Cyprinus carpio L.) 被引量:2
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作者 BoWU YongHuaSUN YanWuWANG YaPingWANG ZuoYanZHU 《Cell Research》 SCIE CAS CSCD 2005年第6期447-454,共8页
The integration pattern and adjacent host sequences of the inserted pMThGH-transgene in the F4 hGH-transgeniccommon carp were extensively studied. Here we show that each F4 transgenic fish contained about 200 copies o... The integration pattern and adjacent host sequences of the inserted pMThGH-transgene in the F4 hGH-transgeniccommon carp were extensively studied. Here we show that each F4 transgenic fish contained about 200 copies of thepMThGH-transgene and the transgenes were integrated into the host genome generally with concatemers in a head-to-tail arrangement at 4-5 insertion sites. By using a method of plasmid rescue, four hundred copies of transgenes fromtwo individuals of F4 transgenic fish, A and B, were recovered and clarified into 6 classes. All classes of recoveredtransgenes contained either complete or partial pMThGH sequences. The class I, which comprised 83% and 84.5%respectively of the recovered transgene copies from fish A and B, had maintained the original configuration, indicatingthat most transgenes were faithfully inherited during the four generations of reproduction. The other five classes weredifferent from the original configuration in both molecular weight and restriction map, indicating that a few transgeneshad undergone mutation, rearrangement or deletion during integration and germline transmission. In the five types ofaberrant transgenes, three flanking sequences of the host genome were analyzed. These sequences were common carpβ-actin gene, common carp DNA sequences homologous to mouse phosphoglycerate kinase-1 and human epidermalkeratin 14, respectively. 展开更多
关键词 transgenic common carp plasmid rescue germline transmission integration pattern.
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8-Weighted-Type Fractional Fourier Transform Based Three-Branch Transmission Method 被引量:3
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作者 Jing Li Xuejun Sha +1 位作者 Xiaojie Fang Lin Mei 《China Communications》 SCIE CSCD 2018年第9期147-159,共13页
To improve the bit error rate(BER) performance of multiple input multiple output(MIMO) systems with low complexity, a three-branch transmission scheme employing 8-weighted-type fractional Fourier transform(8-WFRFT) mo... To improve the bit error rate(BER) performance of multiple input multiple output(MIMO) systems with low complexity, a three-branch transmission scheme employing 8-weighted-type fractional Fourier transform(8-WFRFT) module is proposed. In the proposed scheme, the original signal is first decomposed into eight sub-signals and then merged into three component signals by the same carrier pattern. The three signals have mathematical constraint relations among themselves that can counteract the channel fading. They are simultaneously transmitted via three independent antennas after delay regulating. At the receiver, an inverse 8-WFRFT module is employed to obtain the estimated original signal by processing the received signal. Then, the bit error rate(BER) performance, transmitting power, transmission rate, power spectrum and computational complexity of the proposed scheme are analysed in detail. Numerical results show that the proposed scheme has a superior performance compared to STBC based three-antenna transmission scheme, in terms of BER performance. 展开更多
关键词 8-weighted-type fractional Fourier transform (8-WFRFT) bit error rate (BER) low complexity multiple input multiple output (MIMO)
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Hydrogenation of 2‐ethylanthraquinone with bimetallic monolithic catalysts: An experimental and DFT study 被引量:7
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作者 Yanyan Guo Chengna Dai Zhigang Lei 《Chinese Journal of Catalysis》 SCIE EI CAS CSCD 北大核心 2018年第6期1070-1080,共11页
We studied the hydrogenation of 2‐ethylanthraquinone(eAQ) over Pd/SiO2/COR(COR = cordierite) monometallic and Pd‐M/SiO2/COR(M = Ni, Fe, Mn, and Cu) bimetallic monolithic catalysts, which were prepared by the c... We studied the hydrogenation of 2‐ethylanthraquinone(eAQ) over Pd/SiO2/COR(COR = cordierite) monometallic and Pd‐M/SiO2/COR(M = Ni, Fe, Mn, and Cu) bimetallic monolithic catalysts, which were prepared by the co‐impregnation method. Detailed investigations showed that the particle sizes and structures of the Pd‐M(M = Ni, Fe, Mn, and Cu) bimetallic monolithic catalysts were great‐ly affected by the second metal M and the mass ratio of Pd to the second metal M. By virtue of the small particle size and the strong interaction between Pd and Ni of Pd‐Ni alloy, Pd‐Ni bimetallic monolithic catalysts with the mass ratio of Pd/Ni = 2 achieved the highest H2O2 yield(7.5 g/L) and selectivity(95.3%). Moreover, density functional theory calculations were performed for eAQ ad‐sorption to gain a better mechanistic understanding of the molecule‐surface interactions between eAQ and the Pd(1 1 1) or PdM(1 1 1)(M = Ni, Fe, Mn, and Cu) surfaces. It was found that the high activity of the bimetallic Pd‐Ni catalyst was a result of strong chemisorption between Pd3Ni1(1 1 1) and the carbonyl group of eAQ. 展开更多
关键词 BIMETALLIC MONOLITHIC CATALYST Alloy 2‐Ethylanthraquinone hydrogenationDFT CALCULATION SYNERGISTIC effect
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Studies on Pattern of Producing Transgenic Fish II. Several Elements Related to the Establishment of Transgenic Fish
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作者 刘春巧 张永忠 +2 位作者 庄贵洵 孙效文 李云龙 《Developmental and Reproductive Biology》 1997年第2期21-27,共7页
A recombinant plasmid (pcMTsGH) containing the common carp methlothionein promoter (cMT) and salmon growth hormone gene (sGH) was microinjected into common carp fertilized eggs and embryos to optimize the conditions f... A recombinant plasmid (pcMTsGH) containing the common carp methlothionein promoter (cMT) and salmon growth hormone gene (sGH) was microinjected into common carp fertilized eggs and embryos to optimize the conditions for producing transgenic fish. Several key elements were found to have significant effects on the integration of exogenous gene. These elements include forms and doses of pcMTsGH gene microinjected, stages of embryo at which microinjection conducted and pretreatment of fertilized eggs for microinjection. The results show that, in producing transgenic fish, (1) the best time for microinjection is late onecell stage, (2) the most appropriate dose of pcMTsGH gene for microinjection is around 106~107 copies; (3) the hatching rate rises up when the gene is microinjected into the eggs whose chorions are removed, but the integration rate has no significant changes before and after the removal of egg chorions. 展开更多
关键词 transgenic fish integration rate hatching rate
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Mechanical Properties of Ni-Coated Single Graphene Sheet and Their Embedded Aluminum Matrix Composites 被引量:9
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作者 宋海洋 查新未 《Communications in Theoretical Physics》 SCIE CAS CSCD 2010年第7期143-147,共5页
The effects of Ni coating on the mechanical behaviors of single graphene sheet and their embedded Al matrix composites under axial tension are investigated using molecular dynamics (MD) simulation method. The result... The effects of Ni coating on the mechanical behaviors of single graphene sheet and their embedded Al matrix composites under axial tension are investigated using molecular dynamics (MD) simulation method. The results show that the Young's moduli and tensile strength of graphene obviously decrease after Ni coating. The results also show that the mechanical properties of Al matrix can be obviously increased by embedding a single graphene sheet. From the simulation, we also find that the Young's modulus and tensile strength of the Ni-coated graphene/Al composite is obviously larger than those of the uncoated graphene/Al composite. The increased magnitude of the Young's modulus and tensile strength of graphene/Al composite are 52.27% and 32.32% at 0.01 K, respectively, due to Ni coating. By exploring the effects of temperature on the mechanical properties of single graphene sheet and their embedded Al matrix composites, it is found that the higher temperature leads to the lower critical strain and tensile strength. 展开更多
关键词 NANOCOMPOSITES mechanical properties single graphene sheet molecular dynamics simulation
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How Group Heuristics Promotes Cooperative Behavior in Social Dilemma SituationmExploration of Group Heuristics Effects on the Basis of Computer Simulation 被引量:2
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作者 Atsuo Murata Saki Kubo Naoki Hata 《Computer Technology and Application》 2012年第10期699-705,共7页
As it is impossible to assume complete rationality in a social dilemma situation, the assumption of bounded rationality is appropriate. Under the bounded rationality, it would be reasonable to assume that one behaves ... As it is impossible to assume complete rationality in a social dilemma situation, the assumption of bounded rationality is appropriate. Under the bounded rationality, it would be reasonable to assume that one behaves according to the heuristics principle. The group identity effect in a social dilemma situation might be very important in order to attain cooperation. The aim of this study was to clarify how to promote a cooperative behavior by avoiding a social dilemma situation. The group heuristics was taken into account, and it was explored how the group heuristics promotes a cooperative behavior in a social dilemma situation. As a result of a two-person game theory experiment, the group heuristics was found to play an important role in a social dilemma situation, and enhance a cooperative behavior. For the following three cases, the higher cooperation rate was attained at the latter half of the experiment: (a) mutual in-group condition, (b) one-way in-group condition, and (f) one-way unknown condition (in-group). In conclusion, the consciousness of in-group membership might help to promote actively mutual cooperation. 展开更多
关键词 Social dilemma group heuristics experimental game theory cooperative behavior.
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Helicobacter species and gut bacterial DNA in Meckel's diverticulum and the appendix 被引量:1
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作者 Peren H Karagin Unne Stenram +1 位作者 Torkel Wadstrm sa Ljungh 《World Journal of Gastroenterology》 SCIE CAS CSCD 2011年第36期4104-4108,共5页
AIM:To analyse the possible association of various Helicobacter species and certain common gut bacteria in patients with Meckel's diverticulum and appendicitis.METHODS:A nested-polymerase chain reaction (PCR),spec... AIM:To analyse the possible association of various Helicobacter species and certain common gut bacteria in patients with Meckel's diverticulum and appendicitis.METHODS:A nested-polymerase chain reaction (PCR),specific to 16S rRNA of the Helicobacter genus,was performed on paraffin embedded samples,50 with acute appendicitis,50 normal appendixes,and 33 Meckel's diverticulum with gastric heterotopia and/or ulcer.Helicobacter genus positive samples were sequenced for species identification.All samples were also analysed for certain gut bacteria by PCR.RESULTS:Helicobacter pullorum DNA was found in one out of 33 cases and Enterobacteria in two cases of Meckel's diverticulum.Helicobacter pylori (H.pylori) was found in three,Enterobacter in 18,and Bacteroides in 19 out of 100 appendix samples by PCR.Enterococcus was not found in any MD or appendix samples.All H.pylori positive cases were from normal appendixes.CONCLUSION:Helicobacter is not an etiological agent in the pathogenesis of symptomatic Meckel's diverticulum or in acute appendicitis. 展开更多
关键词 Meckel's diverticulum HELICOBACTER APPENDIX Polymerase chain reaction
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SAR imagery coding based on blocking high frequency energy matching 被引量:1
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作者 陈德元 Luan +2 位作者 Enjie Tu Guofang 《High Technology Letters》 EI CAS 2009年第4期378-383,共6页
A new fractal image compression algorithm based on high frequency energy (HFE) partitioning andmatched domain block searching is presented to code synthetic aperture radar (SAR) imagery. In the hybridcoding algorithm,... A new fractal image compression algorithm based on high frequency energy (HFE) partitioning andmatched domain block searching is presented to code synthetic aperture radar (SAR) imagery. In the hybridcoding algorithm, the original SAR image is decomposed to low frequency components and high frequencycomponents by wavelet transform (WT). Then the coder uses HFE of block to partition and searchthe matched domain block for each range block to code the low frequency components. For the high frequencycomponents, a modified embedded zero-tree wavelet coding algorithm is applied. Experiment resultsshow that the proposed coder obtains about 0. 3dB gain when compared to the traditional fractal coderbased on the quadtree partition. Moreover, the subjective visual quality of the reconstructed SAR imageof the proposed coder outperforms that of the traditional fractal coders in the same compression ratio(CR). 展开更多
关键词 synthetic aperture radar (SAR) fractal image compression wavelet transform high frequency energy (HFE)
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Research on the Status and Development of Tourism Management Teaching on the Basis of School-enterprise cooperation
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作者 Qin Qin 《International Journal of Technology Management》 2013年第10期66-69,共4页
With the vigorous development of China' s tourism industry, the rapid expansion of universities and tourism management enrollment has trained a large number of tourism professionals, and promoted the rapid developmen... With the vigorous development of China' s tourism industry, the rapid expansion of universities and tourism management enrollment has trained a large number of tourism professionals, and promoted the rapid development of tourism. However, the increasing number of colleges and universities tourism management enrollment and the expansion of the tourism industry have not been able to meet the demand for high-class expertise, which partly due to low tourism management teaching quality of colleges and universities. Whereas the school-enterprise cooperation in personnel training mode is one kind of tourism management that can effectively improve the quality of teaching of important measures. 展开更多
关键词 Tourism Management TEACHING School-enterprise cooperation.
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Study on flow mode of combined converter for methanol synthesis from coal-based syngas 被引量:1
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作者 XIAO Zhen-ping MA Hong-fang +1 位作者 YING Wei-yong FANG Ding-ye 《Journal of Coal Science & Engineering(China)》 2011年第1期88-92,共5页
The mathematic model of combined converter with two different flow modes of gas-cooled reactor was established. The effects of gas flow mode in gas-cooled reactor on combined converter was investigated with the yield ... The mathematic model of combined converter with two different flow modes of gas-cooled reactor was established. The effects of gas flow mode in gas-cooled reactor on combined converter was investigated with the yield of methanol was 1 400 kt/a. The results show that if the flow mode of the cooling pipe gas and the catalytic bed gas change from countercurrent to concurrent, the catalytic bed temperature distribution does not fit the most optimum temperature curve of reversible exothermic reaction and the heat duty of heat changer in whole process increased seriously, which means that there is much more equipment investment and more operating cost. The gas flow mode of gas-cooled reactor affects the methanol yield slightly. There- fore, the countercurrent gas flow mode of gas-cooled reactor is more lucrative in the combined converter process. 展开更多
关键词 METHANOL COMBINED REACTOR countercurrent CONCURRENT
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Digital Signatures for e-Government - a Long-Term Security Architecture 被引量:1
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作者 Przemyslaw Blaskiewicz Przemyslaw Kubiak Miroslaw Kutylowski 《China Communications》 SCIE CSCD 2010年第6期64-70,共7页
The framework of digital signature based on qualified certificates and X. 509 architecture is known to have many security risks. Moreover, the fraud prevention mechanism is fragile and does not provide strong guarante... The framework of digital signature based on qualified certificates and X. 509 architecture is known to have many security risks. Moreover, the fraud prevention mechanism is fragile and does not provide strong guarantees that can be necessary for flow of legal documents. Mediated signatures have been proposed as a mechanism to effectively disable signature cards. In this paper we propose further mechanisms that can be applied on top of mediated RSA, compatible with the standard format, but providing security guarantees even in the case when RSA becomes broken or the keys are compromised. The solution is immune tokleptographic attacks as only deterministic algorithms are used on user's side. 展开更多
关键词 MRSA PSS padding hash based signatures kleptography deterministic signatures
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Detection of " Candidatus Phytoplasma asteris" in Brussels Sprout and Its Possible Association with Flower Bud Failure in Poland
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作者 Maria Kamiflska Hanna Bemiak Piotr Kamifiski 《Journal of Life Sciences》 2012年第3期253-259,共7页
Severe growth abnormalities including shoot stunting, leaf blade reduction and flower bud failure of Brussels sprout were observed in Poland. The presence of phytoplasma in diseased as well as in healthy looking plant... Severe growth abnormalities including shoot stunting, leaf blade reduction and flower bud failure of Brussels sprout were observed in Poland. The presence of phytoplasma in diseased as well as in healthy looking plants, was demonstrated by nested polymerase chain reaction assay employing phytoplasma universal rRNA primer pairs-P1/P7 followed by R16F2n/R16R2. Products of PCR primed by R 16F2n/R 16R2 primer pair from naturally infected Brussels sprouts were sequenced. Comparison of the obtained 16S rDNAs revealed high nucleotide sequence identity between analyzed phytoplasma isolates (99.8%-100%). They were also nearly identical with the sequences of other phytoplasmas isolates from sub-group 16SrI-B, and they were classified as members of "Candidatus Phytoplasma asteris". 展开更多
关键词 Brussels sprout flower bud failure PHYTOPLASMA 16S rDNA.
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Research of college English network based on Boyer's integrating academic perspective
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作者 Zhou Yun 《International Journal of Technology Management》 2015年第2期130-132,共3页
The information technology assisted English teaching has witnessed fast development and entered the classroom through course integration process. The integration radically changes the essence of college English teachi... The information technology assisted English teaching has witnessed fast development and entered the classroom through course integration process. The integration radically changes the essence of college English teaching, and therefore the traditional teaching mode has been challenged. In other words, information technology has become an integral part in today' s web-based college English teaching classroom. This paper attempts to read in detail about the Boyer' s teaching academic thought. Combined with the current situation of college English teaching, this paper discusses the feasibility of teaching academic thinking is applied to the English network teaching. A model is established by exploratory factor analysis and confirmatory factor analysis. Through the way of questionnaire to the research on the college English network teaching, so as to put forward the solutions and improve the quality of teaching. 展开更多
关键词 Web-based environment College English-teaching Optimization Integrating academic perspective.
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