共查询到19条相似文献,搜索用时 62 毫秒
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针对高职产教融合存在的问题,构建了“三三结合式”人才培养模式,即通过“企业指导、行业引导、学校督导”三结合,改革人才培养模式;通过“核心课程、核心问题、核心能力”三结合,深化“教师、教材、教法、教学评价”四教改革;通过“基础实验、专业实验,实习实训”三结合,优化实践教学体系。该模式的构建与实施能提升学生的职业素养,提高毕业生的就业质量,打造出优秀的双师型教师团队。 相似文献
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In fermentative hydrogen production, the low-hydrogen-producing bacteria retention rate limits the suspended growth reactor
productivity because of the long hydraulic retention time (HRT) required to maintain adequate bacteria population. Traditional
bacteria immobilization methods such as calcium alginate entrapment have many application limitations in hydrogen fermentation,
including limited duration time, bacteria leakage, cost, and so on. The use of chloroform-treated anaerobic granular sludge
as immobilized hydrogen-producing bacteria in an immobilized hydrogen culture may be able to overcome the limitations of traditional
immobilization methods. This paper reports the findings on the performance of fed-batch cultures and continuous cultures inoculated
with chloroform-treated granules. The chloroform-treated granules were able to be reused over four fed-batch cultures, with
pH adjustment. The upflow reactor packed with chloroform-treated granules was studied, and the HRT of the upflow reactor was
found to be as low as 4 h without any decrease in hydrogen production yield. Initial pH and glucose concentration of the culture
medium significantly influenced the performance of the reactor. The optimum initial pH of the culture medium was neutral,
and the optimum glucose concentration of the culture medium was below 20 g chemical oxygen demand/L at HRT 4 h. This study
also investigated the possibility of integrating immobilized hydrogen fermentation using chloroform-treated granules with
immobilized methane production using untreated granular sludge. The results showed that the integrated batch cultures produced
1.01 mol hydrogen and 2 mol methane per mol glucose. Treating the methanogenic granules with chloroform and then using the
treated granules as immobilized hydrogen-producing sludge demonstrated advantages over other immobilization methods because
the treated granules provide hydrogen-producing bacteria with a protective niche, a long duration of an active culture, and
excellent settling velocity. This integrated two-stage design for immobilized hydrogen fermentation and methane production
offers a promising approach for modifying current anaerobic wastewater treatment processes to harvest hydrogen from the existing
systems. 相似文献
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Emergy Based Analysis of Italian Electricity Production System 总被引:3,自引:0,他引:3
Caruso C. Catenacci G. Marchettini N. Principi I. Tiezzi E. 《Journal of Thermal Analysis and Calorimetry》2001,66(1):265-272
The continuously increasing demand for electric power together with the demand of environmental friendly technologies require
a deep acknowledgement of the directions to give to electric power production in order to satisfy both necessities.
The aim of this work is to evaluate the sustainability of Italian electric system by using the emergy function, a methodology
developed in the early80s by Odum, and its correlated indices. Emergy is a thermodynamic based function that calculates all
the fluxes of energy requested to obtain a product going backward to the solar energy invested.
We analyzed all the inputs concurring to the yield of electricity taking into account not only the final phases of the production
but also all the sources and materials that had been necessary for the system to operate. We have performed a wide analysis
of all the different types of production focusing on thermoelectric sector.
We have obtained not only a thermodynamic analysis of electricity production but also an evaluation of the sustainability
of the entire process and a scenario for a correct exploitation of resources.
This revised version was published online in July 2006 with corrections to the Cover Date. 相似文献
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秸秆生产乙醇预处理关键技术 总被引:1,自引:0,他引:1
乙醇是一种很有希望替代有限石油的燃料.目前燃料乙醇已在我国部分省市得到应用.我国目前燃料乙醇生产的主要原料是陈化粮,但我国陈化粮可用于燃料乙醇生产的量十分有限.真正可大量转化乙醇的应是纤维质材料.纤维质材料转化乙醇的挑战性问题是产量偏低、成本偏高.纤维质材料的预处理是转化乙醇过程中的关键步骤,该步骤的优化可明显提高纤维素的水解率,进而降低乙醇的生产成本.本文总结了纤维质材料预处理的各种方法,对各种方法的优缺点进行了综述和分析,并对生物质预处理技术发展的前景进行了展望. 相似文献
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本文对我国自建国以后通过引进国外技术发展起来的高分子生产状况进行了综合评述。对其在各阶段的特点以及在我国经济建设与技术发展上的作用进行了总结与分析,指出:截止到1988年底我国共引进(指已投产者)25个合成高分子品种及298.52万吨/年生产能力。 相似文献
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K. Heide 《Journal of Thermal Analysis and Calorimetry》1992,38(1-2):27-36
The possibility of modified thermal analytical techniques is discussed with respect to the control and optimization of glass production.Calorimetry and EGA-measurements are particularly interesting. A reversed drop calorimeter is described for the determination of the energy expended in the heating of a glass batch into the original state of constitution.A piece of special EGA-equipment with MS-gas detection allows the determination of vaporization of chemical reactive and toxic species such as halides, AS2O3, Na2O, PbO etc. evolved out of the glass batch during the thermal treatment.A possibility of production control by means of vacuum gas release profiles of glass-specimens is demonstrated.
Zusammenfassung Im Hinblick auf Steuerung und Optimierung der Glasherstellung wird die Möglichkeit von modifizierten thermoanalytischen Techniken diskutiert.Besonders interessant sind Kalorimetrie und EGA-Messungen. Zur Bestimmung der Energie, die dafür benötigt wird, Glasgemenge thermisch in ihren ursprünglichen Beschaffenheitszustand zu überführen, wird ein umgekehrtes≓ Tropfenkalorimeter vorgestellt.Eine spezielle EGA-Apparatur mit MS-Gasdetektion ermöglicht die Bestimmung der Verdampfung chemisch reaktiver und toxischer Substanzen wie z.B. von Halogeniden, AS2O3, Na2O, PbO usw., die bei der Hitzebehandlung aus dem Glasgemenge austreten.Es wird eine Möglichkeit zur Produktionssteuerung mit Hilfe der Gasprofile der in Vakuum freigesetzten Gase dargestellt.相似文献