Gas composition

Essential oil (EO) from leaves of Eucalyptus robusta was extracted by hydrodistillation, and analyzed the chemical composition using gas chromatography- Flame ionization detector (GCFID), and gas chromatography/mass spectrometry (GC/MS).

7p viling 27-09-2024 4 2   Download

In this study, we synthesized hydroxyapatite (HA) on polyvinyl alcohol/TiO2 (PVA/TiO2) in which TiO2 was prepared by the sol-gel method. HA was formed by immersing the membrane in the simulated body fluid (SBF) solution. We improved the mechanical strength of the membranes by adding glutaraldehyde (GA) combining with heat treatment to cross-link the polymer network.

14p dianmotminh02 03-05-2024 3 2   Download

Magnolia citrata Noot. & Chalermglin was collected in the Central Highlands of Vietnam and examined for its essential oils’ chemical compositions and antimicrobial activities. The essential oils were obtained from the leaves, twigs, and stem barks of M. citrata using hydrodistillation, then analyzed using Gas Chromatography-Mass Spectrometry (GC-MS) and evaluated for antimicrobial activities.

10p dianmotminh02 03-05-2024 3 2   Download

In this study, we used the reliable GC-FID/MS technique to analyze the methyl ester derivatives of 37 different kinds of fatty acids. The results showed that high saturated fat concentration in all samples was mostly palmitic acid, whereas the low unsaturated fatty acid content in the cis form was primarily oleic acid and linoleic acid. The amount of monounsaturated and polyunsaturated fats is quite low.

6p dianmotminh02 03-05-2024 2 2   Download

CuO nanoparticles were synthesized by alcohol-assisted hydrothermal method at various pH values, using sodium hydroxide as a precursor for pH control. The chemical composition, morphological and structural properties of the obtained CuO nanoparticles were investigated by the Raman and energy-dispersive X-ray spectroscopies, the field-emission scanning electron microscopy, and the X-ray diffraction.

12p dianmotminh02 03-05-2024 4 2   Download

Nghiên cứu này tập trung chế tạo màng composite từ polyvinyl alcohol (PVA), glycidyltrimethylammonium chloride (GTMAC), và glutaric anhydride (GA) như một màng trao đổi anion độc lập hoặc được gắn lên điện cực carbon, nghiên cứu độ hấp thu nước và khả năng dẫn ion của màng, đồng thời sử dụng điện cực phủ màng composite PVA/GTMAC/GA trong thiết bị MCDI nhằm đánh giá khả năng hoạt động của màng trao đổi ion so với màng trao đổi anion công nghiệp.

7p kimphuong1126 07-09-2023 4 3   Download

This study proceeded to address the following objectives: To evaluate the effect of gas composition commonly used in modified atmosphere packaging (80% O2 and 20% CO2) on the shelf life of beef patties; to formulate an optimal solution containing natural antioxidant and antimicrobial preservatives and to study the effect of this combination and MAP on physiochemical attributes (surface colour (chroma, hue angle), metmyoglobin and oxmyoglobin contents, lipid stability) of fresh beef patties; to evaluate the effect of combined antioxidant – antimicrobial natural preservative and MAP on packag...

95p runthenight04 02-02-2023 6 1   Download

Bài viết Giải pháp cho điểm kết nối nhà ga hồ Hoàn Kiếm và tuyến tàu điện ngầm số 2 giới thiệu về phương án bê tông cốt sợi thuỷ tinh cho tấm tường vây nhà ga, TBM xuyên qua tường vây bằng cách cắt cốt thép GFRP (một dạng của vật liệu composite) và nghiền bê tông. Đây là giải pháp nhằm đẩy nhanh tiến độ, đơn giản và an toàn nhất để tạo lối mở giữa đường hầm và nhà ga.

5p visaleen 03-11-2022 13 3   Download

The research objectives of the thesis: Mn-(Bi, Ga) based rare-earth-free hard magnetic materials. Soft magnetic materials of Fe-Co. Rare-earth-free hard magnetic nano composite materials of Mn-(Bi, Ga)/Fe-Co.

27p thebadguys 08-06-2021 30 5   Download

To successfully fabricate on-chip sensors based on α-Fe2O3, ZFO NFs and their loading with RGO by on-chip electrospinning. To explore the effect of parameters (i.e. solution composition, heat treatment, electrospun time, and RGO concentration) of fabrication process on the NF morphology, structure and H2S gas sensing properties.

27p kequaidan7 01-09-2020 12 1   Download

To successfully fabricate sensor based on α-Fe2O3, ZFO NFs and their loading with RGO by on-chip electrospinning method. To explore the effect of fabrication parameters (i.e. solution composition, heat treatment, electrospun time, and RGO concentration) on the NF morphology, structure and H2S gas sensing properties. To clarify H2S gas-sensing mechanism of the sensors of α-Fe2O3, ZFO NFs and their incorporation with RGO.

141p trinhthamhodang7 31-08-2020 12 2   Download

Salicylaldehyde has many applications as an intermediate in chemical industries. Genus Filipendula is a potential source of salicycldehyde. Essential oils are prescribed for a variety of health problems by traditional systems of medicine, all over the world. In present study, leaf essential oil composition of Filipendula vestita (Wall. Ex G. Don) Maxim. (Family: Rosaceae) from Uttrakhand, India was analyzed using gas chromatography (GC-FID) and gas chromatography-mass spectrometry (GC-MS) methods.

5p abcxyz123_02 03-03-2020 21 1   Download

The thesis has identified the chemical composition, nutritional value of several tannin-fed leaf tops common in Vietnam and the effects of the source and the level of each type of plant to the substrate on the rate and in vitro gas characterization, methane production, in vitro digestibility, energy value (ME) and short-chain fatty acid content.

27p mangamanga 21-02-2020 36 6   Download

Trong nghiên cứu này, một số đặc trưng của bột đá khô và ướt được khảo sát bao gồm thành phần khoáng, thành phần hóa học, phân bố kích thước hạt, hình thái học và so sánh với bột đá thương phẩm. Ngoài ra, một số tính chất cơ học như kéo, uốn, va đập, độ cứng và khả năng chịu tải trọng nén của composite từ nhựa polyester không no, sợi thủy tinh và bột đá cũng được khảo sát nhằm đánh giá khả năng thay thế bột đá thương phẩm trong chế tạo một số sản phẩm composite như song chắn rác, nắp hố ga và lươn giao thông.

6p vidanh95 13-12-2018 89 2   Download

The present work describes an experimental study on sewage sludge pyrolysis in a Fluidised Bed Reactor(FluBR) and the effect on the pyrolysis liquid product of passing the hot exhaust (pyrolysis) vapours through a Fixed Bed Reactor (FixBR) filled with gamma-alumina (c-Al2O3).

9p tuananhhumg 04-11-2013 48 3   Download

Pyrolysis of activated sewage sludge was investigated under inert conditions in a fluidised-bed to study the effects of temperature and gas residence time on the product distribution and composition with an aim to maximise the oil yield.

8p tuananhhumg 04-11-2013 77 5   Download

The polar glycolipids were isolated from the thermophilic bacteriaMeiothermus taiwanensisATCC BAA-400 by eth-anol extraction and purified by Sephadex LH-20 and silica gel column chromatography. The fatty acid composition of O-acyl groups in the glycolipids was obtained by gas chro-matography mass spectroscopy analysis on their methyl esters derived from methanolysis and was made mainly of C15:0(34.0%) andC17:0(42.3%) fattyacids,withthemajority as branched fatty acids (over 80%).

7p awards 05-04-2013 41 1   Download

Analytical chemists work to improve the reliability of existing techniques to meet the demands of for better chemical measurements which arise constantly in our society They adapt proven methodologies to new kinds of materials or to answer new questions about their composition. They carry out research to discover completely new principles of measurements and are at the forefront of the utilization of major discoveries such as lasers and microchip devices for practical purposes.

24p qdung92ct 03-07-2012 60 4   Download

Over 25 years ago, Horvath and Melander, in their fundamental work [1], discussed the reason behind the explosive popularity of reversed-phase liquid chromatography (RPLC) for analytical separations. It was estimated that about 80–90% of all analytical separations were performed in RPLC mode, and the authors noted that “the variation of eluent composition alone extends both retention and selectivity in HPLC [high-performance liquid chromatography] over an extremely broad range.

34p bigbaby87 03-09-2010 128 40   Download