基于超快速气相电子鼻及Feller加成模型的胡椒精油特征香气成分分析

本文以胡椒精油为研究对象,基于超快速气相电子鼻及Feller加成模型对其特征香气进行分析,结果表明:胡椒精油主要由α-蒎烯、桧烯、β-蒎烯、3-蒈烯、D-柠檬烯、月桂烯、反式石竹烯等萜类及倍半萜类化合物构成,明确胡椒精油香气贡献度:3-蒈烯>月桂烯>D-柠檬烯>α-蒎烯>桧烯>β-蒎烯>反式石竹烯。利用Feller加成模型对关键呈香成分柠檬烯、α-蒎烯、β-蒎烯、月桂烯、3-蒈烯、反式石竹烯进行相互作用分析,除柠檬烯+α-蒎烯为加成作用,其余均为掩盖。利用超快速气相电子鼻及Feller加成模型对胡椒精油特征香气成分进行分析,明确呈香物质间的相互作用,为胡椒精油风味特征研究提供理论指导。

基于排污权交易的再生水定价模型

通过对已有再生水定价方法进行分析,以基于成本的再生水定价模型为基础,建立了再生水供方最低定价模型;引入排污权交易这一重要因素,得出再生水需方最高定价模型,从而得到较为合理的再生水定价区间,并以常州市为例对上述再生水定价模型进行实证研究,最后讨论了基于排污权交易的再生水定价模型的特点与适用条件。

汇率传递效应的模型研究

20世纪80年代以来,研究者通过加成模型和内生汇率效应模型对出口商的定价行为进行研究,企图在不完全竞争市场结构中找到汇率不完全传递的原因。文章首先分析了四个主要的加成模型,在此基础上,进一步分析了内生汇率效应模型,它弥补了加成模型的不足,指出当汇率内生时,汇率对进口价格的传递效应要小一些。

谁来主导中国制造业的“互联网+”化?

在"互联网+"行动计划中,产业互联网是个热点问题。网络垄断的巨额利润诱导企业竞相投资网络建设,但由此可能会导致网络投资过度竞争。产业互联网化过程中,各行业由谁来主导产业链的网络化构建或重构,避免过度竞争,事关企业和产业网络经济效能。基于上游企业、下游企业以及第三方企业的关联性与特点,构建产业链中各方对网络资产投入倾向的理论模型,探究产业互联网化的主导力量。分析结果显示,产业内各方企业选择网络投资取决于产业的市场势力。通过测算中国制造业各细分行业的集中度,分析制造业的市场结构,提出制造业分行业互联网化的主导力量。相关成果可为传统制造业的互联网化改造提供决策参考。

中国股票市场与房地产市场泡沫问题研究

本文针对近年来中国股票市场泡沫问题和房地产市场的泡沫问题这两个市场的具体情况,分别采用简化的F-O模型测度中国股票市场的泡沫度和成本加成定价模型测度房地产市场的泡沫度,得出1999-2007年我国这两个市场近9年来的月度泡沫估计值;通过对两个市场的泡沫度的对比分析,我们发现股票市场的泡沫度比房地产市场的波动更大;房地产市场泡沫并不是导致股票市场泡沫的原因;而股票市场泡沫却是房地产市场泡沫产生的原因。

城市再生水管网布局优化与经济比选探讨

以成都东部新区空港新城第9再生水厂所在分区为例,通过合理优化再生水用水结构及管网布局,综合考虑消毒、加压提升泵站运维和管网建设运维三部分成本,构建成本加成模型,对比采用合建及分建两种布局模式下再生水管网的全周期建设运维成本,分析评价两种布局的优劣势,因地制宜提出再生水管网布局优化建议。

Comparison between responses of reinforced and unreinforced embankments due to road widening

The objective of this work is to compare the responses of geosynthetically-reinforced embankment and unreinforced embankment due to road widening by using the centrifuge model tests and a two-dimensional(2D) finite element(FE) model. The measured and calculated responses of the embankment and foundation exposed to road widening include the settlement,horizontal displacement,pore water pressure,and shear stresses. It is found that the road widening changed the transverse slope of the original pavement surface resulting from the nonuniform settlements. The maximum horizontal movement is found to be located at the shoulder of the original embankment. Although the difference is small,it is clearly seen that the geosynthetic reinforcement reduces the nonuniform settlements and horizontal movements due to road widening. Thus the reinforcement reduces the potential of pavement cracking and increases the stability of the embankment on soft ground in road widening.

Short Group Signatures with Efficient Concurrent Join

Group signature schemes are fundamental cryptographic tools. A group signature scheme allows members of a group to anonymously sign misuse, the anonymity messages. To counter can be revoked by the group manager. The group joining operation is a critical component of group signature scheme, the framing attack can be prevented by group joining processes. This paper presents an efficient group signature scheme with a simple joining protocol that is based on a ＂single message and signature response＂ interaction between the prospective user and the group manager. The security of our group signature is based on the Discrete Logarithm assumption and Decisional Linear Diffie- Hellman assumption. The formal security proof of our scheme is given in the random oracle model. Our scheme is also a very efficient short group signature scheme with efficient concurrent join.

Layout Design-Based Research on Optimization and Assessment Method for Shipbuilding Workshop

The research study proposes to examine a three-dimensional visualization program, emphasizing on improving genetic algorithms through the optimization of a layout design-based standard and discrete shipbuilding workshop. By utilizing a steel processing workshop as an example, the principle of minimum logistic costs will be implemented to obtain an ideological equipment layout, and a mathematical model. The objectiveness is to minimize the total necessary distance traveled between machines. An improved control operator is implemented to improve the iterative efficiency of the genetic algorithm, and yield relevant parameters. The Computer Aided Tri-Dimensional Interface Application （CATIA） software is applied to establish the manufacturing resource base and parametric model of the steel processing workshop. Based on the results of optimized planar logistics, a visual parametric model of the steel processing workshop is constructed, and qualitative and quantitative adjustments then are applied to the model. The method for evaluating the results of the layout is subsequently established through the utilization of AHP. In order to provide a mode of reference to the optimization and layout of the digitalized production workshop, the optimized discrete production workshop will possess a certain level of practical significance.

Evaluation Model Construction of Peak Sweet Processing Suitability of Different Varieties of Chestnut

[Objective] The aims was to construct peak sweet processing suitability evaluation model and determine the suitable varieties of peak sweet processing in chestnut. [Method] ＂Zaofeng＂, ＂Yah Long＂ etc. 15 chestnut varieties in Yan Shan area were taken as research objects and investigated the sensory, physicochemical nutrition and processing indexes. The correlation analysis, principal component analysis and cluster analysis were adopted to simplify and calculate the evaluation index, and set up the mathematical model. [Result] Obvious differences in different varieties of raw materials and products of each index and some indicators existed significant correlation relationship; principal component analysis determined the five principal components： hardness, b value, moisture content, total sugar, browning degree and edible rate or the core indicators of quality evaluation in peak sweet chestnut, and the establishment of products comprehensive value scoring model： Y=0.033 509 hardness ＋0.033 509 b value ＋0.f85 1＇73 moisture content ＋0.208 983 total sugar ＋0.108 499 browning degree ＋0.430 327 ratio of feed, peak sweet chestnut quality and raw material associated model： Y=-1.109＋0.015 ratio of good fruit -0.018 kernel hardness ＋0.008 starch, [Conclusion] Peak sweet chestnut processing suitability evaluation model can provide the basis for chestnut processing and the suitable processing of the chestnut breeding; ＂Yanguang＂, ＂Yan Long＂, ＂Yankui＂, are very suitable, and ＂Zibo＂, ＂Yah Ping＂ are more appropriate for peak sweet processing.

An Improved Method for Modeling Spatial Distribution of δD in Surface Snow over Antarctic Ice Sheet

Using the recent compilation of the isotopic composition data of surface snow of Antarctic ice sheet, we proposed an improved interpolation method of δD, which utilizes geographical factors （i.e., latitude and altitude） as the primary predictors and incorporates inverse distance weighting （IDW） technique. The method was applied to a high-resolution digital elevation model （DEM） to produce a grid map of multi-year mean δD values with lkm spatial resolution for Antarctica. The mean absolute deviation between observed and estimated data in the map is about 5.4‰, and the standard deviation is 9‰. The resulting δD pattern resembles well known characteristics such as the depletion of the heavy isotopes with increasing latitude and distance from coast line, but also reveals the complex topographic effects.

Selective laser melting 3D printing of Ni-based superalloy： understanding thermodynamic mechanisms

A mesoscopic model has been established to investigate the thermodynamic mechanisms and densification behavior of nickel-based superalloy during additive manufacturing/three-dimensional （3D） printing （AM/3DP） by numerical simulation, using a finite volume method （FVM）. The influence of the applied linear energy density （LED） on dimensions of the molten pool, thermodynamic mechanisms within the pool, bubbles migration and resultant densification behavior of AM/3DP-processed superalloy has been discussed. It reveals that the center of the molten pool slightly shifts with a lagging of 4 ktm towards the center of the moving laser beam. The Mar- angoni convection, which has various flow patterns, plays a crucial role in intensifying the convective heat and mass transfer, which is responsible for the bubbles migration and densification behavior of AM/3DP-processed parts. At an optimized LED of 221.5 J/m, the outward convection favors the numerous bubbles to escape from the molten pool easily and the resultant considerably high relative density of 98.9 % is achieved. However, as the applied LED further increases over 249.5 J/m, the convection pattern is apparently intensified with the formation of vortexes and the bubbles tend to be entrapped by the rotating flow within the molten pool, resulting in a large amount of residual porosity and a sharp reduction in densification of the superalloy. The change rules of the relative density and the corresponding distribution of porosity obtained by experiments are in accordance with the simulation results.

In vivo tracing of superparamagnetic iron oxide-labeled bone marrow mesenchymal stem cells transplanted for traumatic brain injury by susceptibility weighted imaging in a rat model

Objective：To label rat bone marrow mesenchymal stem cells （BMSCs） with superparamagnetic iron oxide （SPIO） in vitro, and to monitor the survival and location of these labeled BMSCs in a rat model of traumatic brain injury （TBI） by susceptibility weighted imaging （SWI）sequence.Methods：BMSCs were cultured in vitro and then labeled with SPIO. Totally 24 male Sprague Dawley （SD） rats weighing 200-250 g were randomly divided into 4 groups： Groups A-D （n=6 for each group）. Moderate TBI models of all the rats were developed in the left hemisphere following Feeney＇s method. Group A was the experimental group and stereotaxic transplantation of BMSCs labeled with SPIO into the region nearby the contusion was conducted in this group 24 hours after TBI modeling. The other three groups were control groups with transplantation of SPIO, unlabeled BMSCs and injection of nutrient solution respectively conducted in Groups B, C and D at the same time. Monitoring of these SPIO-labeled BMSCs by SWI was performed one day,one week and three weeks after implantation.Results： Numerous BMSCs were successfully labeled with SPIO. They were positive for Prussian blue staining and intracytoplasm positive blue stained particles were found under a microscope （×200）. Scattered little iron particles were observed in the vesicles by electron microscopy （×5000）. MRI of the transplantation sites of the left hemisphere demonstrated a low signal intensity on magnitude images,phase images and SWI images for all the test rats in Group A, and the lesion in the left parietal cortex demonstrated a semicircular low intensity on SWI images, which clearly showed the distribution and migration of BMSCs in the first and third weeks. For Group B, a low signal intensity by MRI was only observed on the first day but undetected during the following examination. No signals were observed in Groups C and D at any time points.Conclusion：SWI sequence in vivo can consecutively and noninvasively trace and demonstrate the status and distribution of BMSCs labeled with SPIO in the brain of TBI model rats.