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排序方式: 共有159条查询结果,搜索用时 15 毫秒
11.
High‐Precision Temperature‐Controllable Metal‐Coated Polymeric Molds for Programmable,Hierarchical Patterning 下载免费PDF全文
Kwang Su Kim Jong Uk Kim Sori Lee Ju Seung Lee Young Jin Jo Byeonghak Park Hyowon Tak Pil J. Yoo Tae‐il Kim 《Advanced functional materials》2017,27(38)
Nanofabrication is an indispensable process in nanoscience and nanotechnology. Unconventional lithographic techniques are often used for fabrication as alternatives to photolithography because they are faster, more cost‐effective, and simpler to use. However, these techniques are limited in scalability and utility because of the collapse of preprinted structures during step‐and‐repeat processes. This study proposes a new class of temperature‐controllable polymeric molds that are coated with a metal such that any site‐specific patterning can be accomplished in a programmable manner using selective contact‐dewetting lithography. The lithography allows sub‐100 nm patterning, step‐and‐repeat processing, and hierarchical structure fabrication. The programmable feature of the lithography can be utilized for the structural coloring and shaping of objects. Large‐area programmable patterning, semiconductor device manufacturing, and the fabrication of iridescent security devices would benefit from the unique features of the proposed strategy. 相似文献
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Kaktcham Pierre Marie Zambou Ngoufack François Foko Kouam Edith Marius Oana Ciobotaru Florentina Matei Calina Petruta Cornea 《Food Biotechnology》2013,27(4):237-256
This study aims to evaluate the antifungal activity of lactic acid bacteria (LAB) from some Cameroonian food commodities against mycotoxigenic and spoilage molds. Following LAB isolation, the antifungal activity of the isolates was assessed. The organic acids were quantified using high-performance liquid chromatography and the ability of the LAB to reduce mold biomass and aflatoxin production was evaluated. The LAB were identified and the biopreservative potential of strain LO3 was evaluated on tomato paste. Nine percent of the strains isolated showed broad antifungal activity. The activity was due to the effect of organic acids comprising lactic, acetic, 4-hydroxy-3-phenyllactic and 3-phenyllactic acids. Lactobacillus plantarum LO3 exhibiting the highest and broadest antifungal activity was selected and showed the capacity to inhibit fungal growth and aflatoxin production in vitro. Moreover, this strain and its cell-free supernatant showed the ability to prevent aflatoxigenic mold growth in tomato paste without altering its physico-chemical and organoleptic properties. 相似文献
14.
Volatile organic compounds emitted by filamentous fungi isolated from flooded homes after Hurricane Sandy show toxicity in a Drosophila bioassay 下载免费PDF全文
G. Zhao G. Yin A. A. Inamdar J. Luo N. Zhang I. Yang B. Buckley J. W. Bennett 《Indoor air》2017,27(3):518-528
Superstorm Sandy provided an opportunity to study filamentous fungi (molds) associated with winter storm damage. We collected 36 morphologically distinct fungal isolates from flooded buildings. By combining traditional morphological and cultural characters with an analysis of ITS sequences (the fungal DNA barcode), we identified 24 fungal species that belong to eight genera: Penicillium (11 species), Fusarium (four species), Aspergillus (three species), Trichoderma (two species), and one species each of Metarhizium, Mucor, Pestalotiopsis, and Umbelopsis. Then, we used a Drosophila larval assay to assess possible toxicity of volatile organic compounds (VOCs) emitted by these molds. When cultured in a shared atmosphere with growing cultures of molds isolated after Hurricane Sandy, larval toxicity ranged from 15 to 80%. VOCs from Aspergillus niger 129B were the most toxic yielding 80% mortality to Drosophila after 12 days. The VOCs from Trichoderma longibrachiatum 117, Mucor racemosus 138a, and Metarhizium anisopliae 124 were relatively non‐toxigenic. A preliminary analysis of VOCs was conducted using solid‐phase microextraction‐gas chromatography‐mass spectrometry from two of the most toxic, two of the least toxic, and two species of intermediate toxicity. The more toxic molds produced higher concentrations of 1‐octen‐3‐ol, 3‐octanone, 3‐octanol, 2‐octen‐1‐ol, and 2‐nonanone; while the less toxic molds produced more 3‐methyl‐1‐butanol and 2‐methyl‐1‐propanol, or an overall lower amount of volatiles. Our data support the hypothesis that at certain concentrations, some VOCs emitted by indoor molds are toxigenic. 相似文献
15.
制定冲压工艺时经常会遇到对称件分离的工序,在设计分离工序的模具时,要综合考虑到各种因素,保证冲切成功.文章在对零件的工艺性进行认真分析的基础上,有针对性地设计了模具结构中的凸模和凹模,优化实现了矩形拉伸件的分离冲切过程. 相似文献
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用KD计算法设计棒线材拉拔配模规程 总被引:5,自引:2,他引:3
KD计算法是KD-KS计算法在编制棒、线材拉拔配模规程中的应用,它完全可以取代现有的几种计算法。该法计算依据较为合理,运算操作简便。 相似文献
18.
Masahiko Nakamura Katsuhito Jyohzaki Takatoshi Kimura Toshihiro Togaya Kazuo Ida 《Journal of the American Ceramic Society》1990,73(1):35-38
A new ceramic dental mold can cast excellent Ti restoratives by controlling expansion due to the oxidation of additive metal particles. The packing structure of the metal and aggregate particles in the mold can be considered a function of the size distribution of the aggregate grains. An investigation of the expansion mechanism reveals three different relationships of void fraction versus linear thermal expansion for the molds at the high temperature under which oxidation of the metal particles occurs. Room-temperature casting, favorable for making high-quality Ti restoratives, can also be achieved by precisely controlling both the amount of additive metal powder and the compositional distribution of aggregate grain sizes in the mold. 相似文献
19.
探讨了从塑料蜂窝格产品最小规格参数确定到符合该合理规格的挤出模具设计过程和思路,提供可行的工程估算公式和计算机辅助有限元分析验证的方式,在SP挤出技术支持下,推算了与模具设计相关的基础参数,框定了模具设计的虑及范围,最终提供综合设计实例,为下一步的拓展系列设计建立了简便的重复模式。 相似文献
20.
J.M. Bruna M. Fernández E.M. Hierro J.A. Ordóntez L. de la Hoz 《Journal of food science》2000,65(4):731-738
ABSTRACT: The effect of inoculation of the "salchichón" (dry fermented sausage) surface with an atoxigenic, proteolytic, and lipolytic strain of Mucor racemosus and/or the addition of a intracellular extract of the same mold on the ripening process was studied. Four batches of salchichón were manufactured: control, superficially inoculated, added with intracellular extract, and a combination of both treatments. Superficial mold modified the amino and free fatty acid contents, volatile compounds, and sensory properties. Intracellular extract degraded free amino acids, producing a rise in ammonia and volatile compounds. Both treatments combined improved significantly the sensory properties, which were given scores higher than control sausages at the end of ripening. 相似文献