877 research outputs found
Aktivitas Tabir Surya Fraksi N-Heksana Buah Libo Berdasarkan Nilai SPF
No full textLibo (Ficus variegata Blume.) merupakan tumbuhan liar yang telah diketahui berpotensi sebagai sumber antioksidan potensial. Semakin baik aktivitas antioksidan suatu senyawa maka semakin besar pula nilai sun protection factor (SPF) dari senyawa tersebut. Penentuan kategori tabir surya dan nilai SPF fraksi n-heksana buah libo dilakukan secara in-vitro menggunakan spektrofotometer UV-VIS. Konsentrasi terbaik untuk kategori tabir surya fraksi n-heksana adalah 300 dan 400 ppm. Berdasarkan nilai % Te dan % Tp, fraksi n-heksana termasuk kategori perlindungan ekstra dan sunblock. Sedangkan berdasarkan nilai SPF > 20 menunjukkan bahwa fraksi n-heksana termasuk ke dalam kategori proteksi ultra dalam efektivitas tabir surya
Formulation and Evaluation of N-Hexane Fraction of Libo Fruit based Emulgel for Sunscreen
No full textLibo fruit (Ficus variegata Blume) has activity as a sunscreen. Topical form of certain pharmaceuticals can be used to protect the skin from sun exposure. This study aims to determine the best gel-emulsion formula from the libo’s N-Hexane fraction, its stability, and its sunscreen activity. The formula was consist gelling agents variations type and concentration, i.e. carbopol 940 and hydroxypropyl methylcellulose (HPMC). The best formula were chosen based on physicochemical characteristics. the freeze-thaw test deployed to check the stability, and the sunscreen activity was tested using UV-Vis spectrophotometry. The results showed that the best formula was formula 1 with carbopol 940 (1%), there were no changes in physicochemical characteristics during the stability test, and experienced a decrease in sunscreen activity after the stability test
Formulation and Evaluation of N-Hexane Fraction of Libo Fruit based Emulgel for Sunscreen
No full textLibo fruit (Ficus variegata Blume) has activity as a sunscreen. Topical form of certain pharmaceuticals can be used to protect the skin from sun exposure. This study aims to determine the best gel-emulsion formula from the libo’s N-Hexane fraction, its stability, and its sunscreen activity. The formula was consist gelling agents variations type and concentration, i.e. carbopol 940 and hydroxypropyl methylcellulose (HPMC). The best formula were chosen based on physicochemical characteristics. the freeze-thaw test deployed to check the stability, and the sunscreen activity was tested using UV-Vis spectrophotometry. The results showed that the best formula was formula 1 with carbopol 940 (1%), there were no changes in physicochemical characteristics during the stability test, and experienced a decrease in sunscreen activity after the stability test
To the Question of the ECHR and a Place of the Judicial Act Among the Acts of Other Bodies
No full textIn the present article the place and role of the judicial act among acts of other bodies is considered by the author. Author considers both doctrinal bases, and practical aspects of law-enforcement practice. In the conclusion the author emphasizes that the judicial power in the Russian Federation is the power received on a legal, constitutional basis, having opportunity to dispose of whom-libo, than-libo (for example, the personality, property), in limits of the existing legislation. Courts in the procedural order provided by the law carry out the judicial power
Photonic crystal fiber half-taper probe based refractometer
No full textA compact singlemode - photonic crystal fiber - singlemode fiber tip (SPST) refractive index sensor is demonstrated in this paper. A CO2 laser cleaving technique is utilised to provide a clean-cut fiber tip which is then coated by a layer of gold to increase reflection. An average sensitivity of 39.1 nm/RIU and a resolvable index change of 2.56 x 10-4 are obtained experimentally with a ~3.2 µm diameter SPST. The temperature dependence of this fiber optic sensor probe is presented. The proposed SPST refractometer is also significantly less sensitive to temperature and an experimental demonstration of this reduced sensitivity is presented in the paper. Because of its compactness, ease of fabrication, linear response, low temperature dependency, easy connectivity to other fiberized optical components and low cost, this refractometer could find various applications in chemical and biological sensing
Scalable and shapable nacre-like ceramic-metal composites based on deformable microspheres
No full textNatural nacre that consists of brittle minerals and weak organics exhibits a high fracture toughness while retaining a high strength. The exceptional mechanical performance of nacre is attributed to its hierarchical structure like a 'brick-and-mortar' structure, which has inspired the development of tough ceramic-based composites. However, the practical applications of biomimetic structural ceramics are hindered by limited material size, fabrication efficiency and flexibility of being molded into various shapes. We herein report the fabrication of nacre-like ceramic-metal composites based on deformable alumina microspheres coated with nickel salt. Green bodies are produced by assembling the composite microspheres in molds with different shapes. During the hot-pressing sintering of the green bodies, the microspheres are flattened into platelets under pressure and fill up the entire space without visible voids. The aligned platelets are separated by nickel that is reduced from the nickel salt on their surface, constituting a typical 'brick-and-mortar' structure. By tuning the microsphere sizes, the microstructures of the composites can be optimized to obtain a high flexural strength (386 MPa at room temperature and 286.86 MPa at 600 degrees C) and a high fracture toughness (12.76 MPam1/2 at room temperature and 12.99 MPam1/2 at 600 degrees C) simultaneously. This strategy opens a promising avenue for the feasible mass production and all-in-one molding of nacre-like ceramic-metal composites with various shapes, sizes and raw materials.
Based on the compression of deformable ceramic microspheres into platelets, nacre-like ceramic-metal composites integrating high strength, high toughness and shape adaptability are produced via an all-in-one molding process
Cordax armatus De Haan 1842
No full textCordax armatus (De Haan, 1842) (Figs. 13‒16) Forficula armatus De Haan, 1842: 243. Opisthocosmia armata Bormans, 1888: 444. Cordax armatus Burr, 1910: 185. Measurements. Total body: ♂ 13.0‒18.0, ♀ 14.0‒18.0; forceps: ♂ 5.5, ♀ 5.0‒6.0. Material. 1 ♂, Da’an, Fujian, 1959. VI. 25, collected by Jin Gen-Tao & Lin Yang-Ming; 1 ♂, Beibeng, Motuo, Tibet, China, elev. 1050m, 1979. VII. 24, collected by Jin Gen-Tao & Wu Jian-Yi; 2 ♂♂, 4 ♀♀, Beibeng, Motuo, Tibet, China, 1979. VIII. 5 ‒XI. 6, collected by Jin Gen-Tao & Wu Jian-Yi; 1 ♀, Didong, Motuo, Tibet, China, elev. 920m, 1980. VII. 5, collected by Jin Gen-Tao & Wu Jian-Yi; 2 ♂♂, 3 ♀♀, Jinxiu, Guangxi, China, 1981. IX. 17 ‒X. 21, collected by Jin Gen-Tao; 1 ♂, Old Mountain, Jinxiu, Guangxi, China, elev. 1100m, 1981. X. 13, collected by Jin Gen-Tao; 1 ♀, Hekou, Yunnan, China, elev. 130m, 1982. VI. 5, collected by Jin Gen-Tao & Wu Jian-Yi; 1 ♀, Huangniushi, Jiulian Mountain, Jiangxi, elev. 500m, 1986. IX. 10, collected by Jin Gen-Tao & Lin Yang-Ming; 1 ♂, Sancha River, Jinghong, Yunnan, China, 1995. XI. 11‒12, collected by Xu Wen-Hong; 2 ♀♀, Sancha River, Xishuangbanna, Yunnan, China, elev. 750m, 2009. VI. 9‒10, collected by Liu Xian-Wei et al.; 1 ♂, 2 ♀♀, Nonggang, Longzhou, Guangxi, China, elev. 200m, 2013. VII. 10‒13, collected by Zhang Hai-Guang et al.; 2 ♂♂, Dongsai, Maolan, Libo, Guizhou, China, elev. 600‒700m, 2014. VIII. 9‒10, collected by Sun Mei-Ling; 2 ♀♀, Weng’ang, Maolan, Libo, Guizhou, China, elev. 500‒800m, 2014. VIII. 9‒11, collected by Sun Mei-Ling. Distribution. China (Fujian, Jiangxi, Hainan, Guangxi, Yunnan, Tibet, Guizhou), Burma, Borneo, Celebes, Sumatra.Published as part of Sun, Meiling, Li, Kai & Liu, Xianwei, 2016, Three new species of the subfamily Opisthocosmiinae from China (Dermaptera, Forficulidae), with new synonymies and combinations, pp. 359-371 in Zootaxa 4109 (3) on page 365, DOI: 10.11646/zootaxa.4109.3.6, http://zenodo.org/record/26607
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Green & Clean Al-Cu Alloys
No full textFor aluminum alloy casting, degassing is a
necessary step for molten metal, which can
extract the dissolved hydrogen in the melt. For
copper-containing aluminum alloys, a
traditional method is that using the mixed gas
of inert gas and chlorine as the degassing
agent. Because of the toxicity of the gaseous
chlorine, the industrial is trying to avoid
using it even though this method can contribute
to good castings. As a potential solution, the
foundry only used argon during degassing,
however, the castings with this method were
unacceptable since the occurrence of defects.
The goal of this project is to develop a new
green and clean degassing method for copper-
containing alloys without the usage of gaseous
chlorine. To achieve this goal, identify those
defects and figure out the source of those
defects are necessary. Totally four hypotheses
of the occurrence of defects were supposed and
two of them were discussed in this thesis. They
are ineffective hydrogen removal and metal-mold
reaction. Experiments were set in WPI and
Palmer Foundry to investigate defects from
samples with different conditions. This thesis
collected and discussed the results from
experiments, and made the conclusion that
whether these two hypotheses contribute to the
occurrence of defects
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