正确进行阀控式铅酸蓄电池的活化操作

目前在UPS电源中广泛采用密封式免维护蓄电池作为储能的装置。所谓密封式免维护蓄电池是相对开放式添加电解液蓄电池而言,现已更名为阀控式铅酸蓄电池。长期以来,由于名称的误导,使人们忽视了对阀控式铅酸蓄电池的管理、维护。有资料显示,40%以上的UPS故障是由蓄电池直接或间接造成的,这其中除去蓄电池本身质量问题外。

镉镍电池活化操作法

根据鞍钢供电厂使用镉镍电池的实际情况 ,提出采用镉镍电池活化操作法 ,可使经济效益得以大幅度提高。

幼儿园美术领域生活化的研究

在幼儿园进行艺术教学时,可以利用日常生活中的各种废弃材料进行废弃材料教学,对这些废弃材料进行广泛的收集并充分的发掘。此外,还可以将所收集到的资料进行创新美术教学,这不但可以创造出一个更适合儿童的美术教学环境,为儿童提供更多的美术资源,还可以促进儿童环保意识的提升,从而激发他们的艺术创造欲望。

Influences of operating conditions on biocatalytic activity and reusability of Novozym 435 for esterification of free fatty acids with short-chain alcohols:A case study of palm fatty acid distillate

In the present study, the effects of operating conditions on biocatalytic activity and stability of Novozym 435 for repeated-batch biodiesel production from free fatty acid （FFA） were investigated. Thermal deactivation caused by increased operating temperature from 45 to 50 ℃ could seriously affect the reusability of Novozym 435. The deactivation of Novozym 435 during the esterification of oleic acid with ethanol tended to be stronger than that in the system with methanol. Under the optimal conditions, considering both biocatalytic activity and stability of the enzyme, Novozym 435 could be reused for 13 cycles for biodiesel productions from oleic acid and absolute alcohols （methanol and ethanol） with FFA conversions of at least 90%. The presence of 4%-5% water in ethanol significantly affected the reusability of Novozym 435. Changes in the surface morphology of Novozym 435 during the esterification with various conditions were observed. It was revealed that the reduction in catalytic activity was related to the swelling degree of the catalyst surface, Additionally, biodiesel production from low cost renewable feedstocks, such as palm fatty acid distillate （PFAD） and 95% ethanol was examined, The esterification of PFAD with 95% ethanol catalyzed by Novozym 435 in 10-repeated batch operation showed the similar results in FFA conversion as compared to those using oleic acid. Novozym 435 remained active and could maintain 97.6% of its initial conversion after being used for 10 hatches.

Scientific Initiation： Meanings and Peculiarities of Public Policy in Brazil

This paper aims to analyze the Scientific Initiation （SI） as public policy of higher education in Brazil, from meanings and peculiarities of this device in the undergraduate academic＇s formation, created jointly with the National Research Council in 1951 currently National Council for Scientific and Technological Development （CNPq）. This corporation emerged from the recognition of the strategic importance of science and necessity of institutionalization of encouragement and fostering research. This is a theoretical bibliographical study and documentary that evidences the contributions and limits of SI while political science training should be part of academic activities to provide the development and support of investigative spirit. The concept of SI was established in universities as an activity to be developed in order to encourage the student to become familiar with scientific practices. The study concluded that SI is based on institutionalized norms within higher education to foster the development of science, and it is considered as an important strategy of expansion of graduate studies in Brazil.

Discussion on the Design of E-commerce Automatic Operation Module

E-commerce refers to a kind of business and trade activities, which are conducted under the situation that buyers and sellers do not meet each other by using a fast, easy and low-cost way. Along with the promotion and application of computer office automation, it is necessary for e-commerce module to develop towards automation, in which the core lies in making a good design for operation module. In this paper, the promotion of e-commerce in the information age is reviewed by the authors, the unique characteristics of e-commerce functional modules are analyzed, and also the most important point of the design of e-commerce automatic operation module is discussed. Hopefully, helps can be provided for relevant follow-up studies in the future.

Realization approach of Pd-only three-way catalysts with high catalytic performance and thermal stability

Pd-only three-way catalyst （TWC）, Pd supported on washcoating （the mixture of alumina and Ce-Zr solid solution）/cordierite, was prepared and its catalytic performance and the operation window （2-value） at 450 ℃ were evaluated with the simulated automotive exhaust feed gas. Surfactants such as Tween-80 and Span-20 were added in the process of preparing the catalyst in order to improve the thermal stability and catalytic performance of Pd-only TWC. The fresh and aged catalysts at 1000 ℃ for 4 h were characterized by low-temperature N2 adsorption, XRD, XPS, and H2-TPR techniques. The results show that the presence of surfactants in the synthesis slurry could influence the physicochemical properties of the final Pd-only TWC. The FTS catalyst prepared with the mixed surfactant of Tween-80 and Span-20 exhibited excellent three-way catalytic performance. After being aged at 1000℃ for 4 h, the catalytic performances of Pd-only TWCs slightly decreased, but the FTS catalyst still demonstrated higher catalytic performance and better thermal stability compared with the Pd-only catalysts prepared with single surfactant or without any surfactant. And the FTS catalyst has a wider 2 value （operation window） than other catalysts, even after being aged at 1000℃.