基于模糊群决策的绿色供应商选择和订单分配方法

随着市场竞争愈发激烈、全球环境日益恶化以及公众环保意识的提高,绿色采购问题受到了广泛关注。现有研究绝大多数聚焦于考虑绿色准则的供应商选择问题,以实现可持续经营。然而,在综合考虑时间、价格和成本等因素的前提下,从适应性强的供应商处获得适当的产品,对于企业来说更为可行和经济,即供应商选择和订单分配。为了解决上述关键问题,提出了一种模糊环境下的多准则群体决策方法。提出了一种基于理想解相似性偏好排序和层次分析法(technique for order of preference by similarity to ideal solution and analytic hierarchy process,TOPSIS-AHP)的模糊排序方法,该方法可根据企业战略灵活调整传统准则和绿色准则的权重。在双目标优化模型中引入供应商排名进行订货,在实现采购绩效最大化的同时,最大限度地降低采购成本。结果表明:所提方法能够有效评价供应商绩效,并优化候选供应商之间的订单分配。

A unified approach of PID controller design for unstable processes with time delay

This paper addresses a unified approach of the PID controller design for low as well as high order unstable processes with time delay.The design method is based on the direct synthesis(DS)approach to achieve the enhanced load disturbance rejection.To improve the servo response,a two-degree of freedom control scheme has been considered.A suitable guideline has been provided to select the desired reference model in the DS scheme.The direct synthesis controller has been approximated to the PID controller using the frequency response matching method.A consistently better performance has been obtained in comparison with the recently reported methods.

AB069.Defining the perceptual profiles of children and adolescents with a neurodevelopmental condition

Background:Perceptual profiles,or the performance on visual-perceptual tasks that reflect early visual information processing,have been used to suggest condition-specific visuo-perceptual abilities across neurodevelopmental conditions(NDCs).The complexity-specific hypothesis(Bertone et al.,2010)was based on perceptual profiles defined by a selective decrease in sensitivity to more complex,texture-defined information in adults with autism and fragile-x syndrome,suggesting the atypical development of neural networks underlying early perception in NDCs.The aim of this study was to evaluate whether the complexity-specific hypothesis is applicable to children and adolescents with different NDCs by defining and comparing their perceptual profiles.Methods:A single interval,two alternative forced-choice identification paradigm was used to measure the perceptual profiles of 64 participants with a NDC(MIQ=78)and 43 typically developing(TD)participants(MIQ=103),aged 5 to 17 years.Participants with a NDC were diagnosed with either:autism spectrum disorder(ASD,n=32),attention deficit/hyperactivity disorder(ADHD,n=9),or intellectual disability(ID,n=12).Perceptual profiles were defined by measuring participants’sensitivity to static(orientation identification task)and dynamic(direction identification task)gratings(1 cpd)defined by either luminance(simple)or texture(complex)information.The Weschler Abbreviated Scale of Intelligence 2(WASI-2)was used as a measure of cognitive ability.Results:When performance was averaged across NDC and TD participants,no between-group difference in sensitivity was found for any of the conditions assessed.However,when assessed as a function of diagnosis,we found that the ID group was less sensitive to both the luminance(P=0.04)and texture-defined(P=0.01)dynamic information when compared to the TD group.Notably,although the perceptual profile of the ASD group was similar of that of the TD group,a significant positive relationship between mental age and sensitivity to both texture-defined static(r=−0.5)and dynamic(r=−0.4)information was found.Conclusions:The findings demonstrate that different conditions-specific perceptual profiles exist across children and adolescents with different types of NDCs,exemplified by differences found in this study for the ID group.In addition,the positive relationship between perceptual performance and mental age within the ASD group suggests that these perceptual abilities may still be undergoing maturation during the age-range assessed,and provides support for the complexity-specific hypothesis specific to the ASD profile during development.These results exemplify the importance of defining perceptual profiles at different periods of development across NDCs,since the tenets of most perceptually-relevant cognitive theories are based primarily on adult data.

The Principle of Square Hole Machining and It＇s Tooling Structure Design

In order to meet the rapid needs of processing square hole in mechanical equipment, the paper expounds the square hole processing method： planetary wheel method, and analyze the principle of tooling structure and process with computer graphics parameters design. The results that, as long as the appropriate parameters, using the above method not only can punch the square hole, can also be processed triangle, the five angle and hexagonal regular polygon holes. The square hole processing method can provide theoretical basis and engineering reliable reference for related engineering and technical personnel.

Evolution of Microstructure and Ordering in Rolling Process of Fe-6. 5 mass% Si Alloy

Fe-6. 5 mass% Si alloy is an excellent soft magnetic material with good application prospects. After rolling,the structure of the sheet is likely to be heterogeneous along the normal direction. The microstructure and ordering evolution in the thickness range of the sheets during hot-warm rolling process was studied by means of optical microscope and transmission electron microscope. The results show that dynamic recrystallization occurs in the surface parts during the hot and warm rolling processes,where the grains are equiaxed but have high density of dislocations due to the large deformation. The grains in the center part are elongated along the rolling direction. It is also found that in the hot rolled sheet,the center part has lower density of dislocations because of dynamic recovery. Meanwhile,this part has higher ordering content compared with the surface part,indicating that the high density of dislocations can inhibit the formation of ordering in the air cooling process after hot rolling. In the warm rolling process,both of the parts are deformed heavily. Large deformation destroys ordered phases and induces disordering. The ordering content is low in the whole warm rolled sheet.

Mass transfer mechanisms in fixed-bed adsorption of erythromycin

The equilibrium and kinetic characteristics of the adsorption of erythromycin to Sepabeads SP825 were determined.The equilibrium data in a batch system was well described by a Langmuir isotherm.The separation performance was investigated in a fixed-bed system with respect to the adsorption superficial velocity,ionic strength and pH.A mathematical model was used to simulate the mass transfer mechanism,taking film mass transfer,pore diffusion and axial dispersion into account.The model predictions were consistent with the experi-mental data and were consequently used to determine the mass transfer coefficients.