ANALISIS VARIASI TEMPERATUR PRA MORDAN PEWARNA KAYU SECANG DAN DAUN JATI SERTA PENERAPAN HEDONIC TEST PADA KUALITAS SERAT KENAF INDUSTRI FASHION

This study aims to determine the effect of pre-mordant material on kenaf fiber coloring using secang wood and teak leaves, to determine the Henodic Test method in classifying its quality, as well as to determine the significant effect on the color of kenaf fiber, and to determine the level of consumer preference for kenaf fiber. natural dyes. The research method used was an experiment with a variety of pre-mordant materials (alum, lime, vinegar). From the test, it was found that the color direction of the kenaf fiber was reddish purple to light brown, so the average value of fastness to washing was 4 (good). From this activity, it was concluded that the addition of secang wood and teak leaves as pre- mordant materials coupled with the effect of pH on the staining of kenaf fibers with secang wood extract provided variations in the direction of color and the value of color fastness to washing. Kenaf fiber is an environmentally friendly alternative to textile raw materials. This study used the Hedonic Test method with the Kruskal Wallis test. The results of this study were that there was no significant effect on the combination of compost application and pesticide application with natural dyes of secang wood and teak leaves on the color of kenaf fibers and there was no effect on the level of consumer preference for kenaf fiber with natural dyes.

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Tingkat Kesukaan Konsumen Terhadap Serat Kenaf Organik dengan Pewarna Alami

Jurnal Penelitian Pertanian Terapan ◽

10.25181/jppt.v19i1.1398 ◽

2019 ◽

Vol 19 (1) ◽

pp. 58

Author(s):

Rusmini Rusmini ◽

Dwinita Aquastin ◽

Riama Rita Manullang ◽

Daryono Daryono

Keyword(s):

Consumer Preferences ◽

Consumer Preference ◽

Life Forms ◽

Natural Dye ◽

Test Method ◽

Natural Dyes ◽

Synthetic Dyes ◽

Kenaf Fiber ◽

Significant Difference ◽

Color Texture

Production of kenaf fiber for industry mostly uses chemical fertilizers with synthetic dyes that will also cause health and environmental problems and adversely affect all life forms. Increased health and environmental concern make organic kenaf fiber production with natural dyes highly recommended for both handicrafts and for industrial scale because natural fertilizers and dyes are non-toxic, decomposable, and environmentally friendly. The purpose of this study is to determine the level of consumer preference to organic kenaf fiber with natural dyes. The study used a two-factor group randomized design with the first factor of organic kenaf fiber and a second factor of natural dye consisting of 3 levels. The research was repeated as many as 2 replications so that there were 6 experimental units. Variables observed by consumer's level of craft product from organic kenaf fiber with natural dye covering color, texture and odor tested. This test is done by Hedonic Test method, using questionnaire with untrained panelist (consumer) as many as 40 people with data obtained based on a panelist response using a hedonic scale was analyzed by Kruskal-Wallis test. The results showed that there was no significant difference in consumer preferences for the color, texture and odor of organic kenaf fiber with various natural dyes.

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Micro Palm and Kenaf Fibers Reinforced PLA Composite: Effect of Volume Fraction on Tensile Strength

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.145.1 ◽

2011 ◽

Vol 145 ◽

pp. 1-5 ◽

Cited By ~ 2

Author(s):

K.W. Neoh ◽

Kim Yeow Tshai ◽

P.S. Khiew ◽

Chin Hua Chia

Keyword(s):

Tensile Strength ◽

Mechanical Stability ◽

Volume Fraction ◽

Environmental Concern ◽

Raw Materials ◽

Kenaf Fiber ◽

Composite Effect ◽

Fiber Loading ◽

Biodegradable Composite ◽

Kenaf Fibers

Extensive environmental concern associated with the disposal of solid plastic wastes has stirred tremendous interest in the production and use of sustainable biodegradable polymers. Among the vast variety of available materials, Polylactic Acid (PLA) standout as the most commercially viable mass produced resin to date. However, its low thermal and mechanical stability, excessive brittleness, and relatively higher cost have led to numerous research efforts in producing biodegradable polymer composite filled with natural organic fibers. This paper describes the preparation and the mechanical characteristics of a compression molded biodegradable composite made entirely of renewable raw materials. The composites were reinforced with pulverized palm, kenaf and alkali (1M NaOH:fiber in ratio 2:1) treated kenaf fibers, at a fiber mass proportion of 20 to 60% blended PLA and processed in a custom-built compression mold. SEM microscan revealed that the kenaf fiber has a mean diameter of 40μm, length 1236.6μm, and aspect ratio of 31 while the measured values for palm fiber was 58.7μm, 1041.2μm, and 17.7, respectively. All resulting composites showed significant enhancement in tensile strength. At 20, 40 and 60% fiber loading, the palm/PLA composite recorded tensile strength increment of 46.9, 47.8 and 36.6%, respectively. For the kenaf/PLA composite, greatest improvement was achieved at 40% fiber loading with alkali treated kenaf, with approximately 54% higher than the neat PLA while only 12.6% was recorded for the non-treated kenaf/PLA composite, signifying that the surface modification greatly improved fiber-matrix adhesion. SEM observations on the fracture surface showed similar findings. Compared to commercially available palm/Polypropylene (palm/PP) composite at 50% fiber loading, our measured tensile strength for the PLA composite loaded with 40% alkali treated kenaf fiber was still about 20% lower. Further enhancement in the mechanical characteristic of the kenaf/PLA composite is required to push for its wider utilization in the polymer industry.

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PEMBELAJARAN MENULIS TEKS EKSPOSISI BERBASIS E-LEARNING DALAM MENINGKATKAN PRESTASI BELAJAR

Jurnal Pendidikan dan Pembelajaran Bahasa Indonesia ◽

10.23887/jppbi.v9i1.3206 ◽

2020 ◽

Vol 9 (1) ◽

pp. 57-67

Author(s):

I Kadek Darmadi Adiyasa ◽

I Made Sutama ◽

Ida Bagus Putrayasa

Keyword(s):

Student Achievement ◽

Test Method ◽

Student Responses ◽

Average Value ◽

Basic Competency ◽

Improve Student Achievement ◽

Student Achievements ◽

E Learning ◽

Observation Method ◽

Questionnaire Method

The classroom action research conducted at class X IPB1 in SMA Negeri 1 Susut aimed to (1) To describe the steps in implementing e-Learning based learning in writing the exposition text of class X IPB1 at SMA Negeri 1 Susut. (2) Describe student achievements after implementing e-Learning in exposition text of class X IPB1 in SMA Negeri 1 Susut, and (3) Describe student responses after applying e-learning in writing text exposition of class X IPB1 in SMA Negeri 1 Susut. This research was conducted in two cycles in which consisted of five stages, namely: planning, implementing, observing, evaluating, and reflecting. Data were collected by observation method, interview method, test method, questionnaire method and analyzed descriptively quantitative and qualitative. The results showed the average value of the first cycle was 72.6 or an increase of 17.05% from the previous value (pre-cycle) 37. The value of the second cycle was 81.1 or an increase of 43.4%. The acquisition of the average response of students in the first cycle of 33.7% in the very positive category and increased in the second cycle of student responses to 33.96 in the very positive category. The conclusions in this study were (1) learning steps based on e-Learning based on basic competency standards and according to procedures that have been designed. (2) e-Learning can improve student achievement in writing exposition texts. (3) students' responses to e-Learning are very positive. The suggestion of this research is that teachers should use e-learning to improve student achievement.

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SIFAT MEKANIK PAPAN GYPSUM DARI SERBUK LIMBAH KAYU NON KOMERSIAL

Jurnal Riset Industri Hasil Hutan ◽

10.24111/jrihh.v6i2.1231 ◽

2014 ◽

Vol 6 (2) ◽

pp. 1

Author(s):

Saibatul Hamdi

Keyword(s):

Raw Materials ◽

Wood Particle ◽

Quality Standards ◽

Gypsum Board ◽

Average Value ◽

Wood Particles ◽

Sawn Timber ◽

Materials Used ◽

Artocarpus Elasticus ◽

Ficus Glomerata

The purpose of this research is to know the mechanical strength of gypsum board by utilizing waste sawn wood. Raw materials used consist of flour, gypsum,wood particles, boraks and kambang (Goniothalamus sp), wood tarap (Artocarpus elasticus REINW) and lua (Ficus glomerata ROXB). Wood particle 40 mesh and 60 mesh, concentrations boraks of 1 and 2 and the percentage particles of gypsum sawn timber is 300, 400 and 500%. The results showed that the average value Modulus of Rufture (MoR) in lua wood ranges from 12.55 – 14,47 kgcm2, wood kambang 25.10-31,11 kgcm2 and wood tarap 19.20- 24,18 kgcm2. As for Modulus of Elasticity (MoE) on the lua 1129,80- 2092,70 kgcm2, wood kambang 2512,37-3971,32 kgcm2 and tarap 2050,63-2691,09 kgcm2. Gypsum board are mechanical properties do not meet quality standards created SNI 03-6434-2000.Keywords: sawdust, lua, kambang, tarap, gypsum, mechanical

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Experimental study on mechanical properties of polypropylene nanocomposites reinforced with a hybrid graphene/PP-g-MA/kenaf fiber by response surface methodology

Journal of Elastomers & Plastics ◽

10.1177/00952443211015362 ◽

2021 ◽

pp. 009524432110153

Author(s):

Jaber Mirzaei ◽

Abdolhossein Fereidoon ◽

Ahmad Ghasemi-Ghalebahman

Keyword(s):

Mechanical Properties ◽

Response Surface Methodology ◽

Elastic Modulus ◽

Response Surface ◽

Graphene Nanosheets ◽

Hot Press ◽

Kenaf Fiber ◽

Polypropylene Nanocomposites ◽

Kenaf Fibers ◽

Internal Mixer

In this study, the mechanical properties of polypropylene (PP)-based nanocomposites reinforced with graphene nanosheets, kenaf fiber, and polypropylene-grafted maleic anhydride (PP-g-MA) were investigated. Response surface methodology (RSM) based on Box–Behnken design (BBD) was used as the experimental design. The blends fabricated in three levels of parameters include 0, 0.75, and 1.5 wt% graphene nanosheets, 0, 7.5, and 15 wt% kenaf fiber, and 0, 3, and 6 wt% PP-g-MA, prepared by an internal mixer and a hot press machine. The fiber length was 5 mm and was being constant for all samples. Tensile, flexural, and impact tests were conducted to determine the blend properties. The purpose of this research is to achieve the highest mechanical properties of the considered nanocomposite blend. The addition of graphene nanosheets to 1 wt% increased the tensile, flexural, and impact strengths by 16%, 24%, and 19%, respectively, and an addition up to 1.5 wt% reduced them. With further addition of graphene nanosheets until 1.5 wt%, the elastic modulus was increased by 70%. Adding the kenaf fiber up to 15 wt% increased the elastic modulus, tensile, flexural, and impact strength by 24%, 84%, 18%, and 11%, respectively. The addition of PP-g-MA has increased the adhesion, dispersion and compatibility of graphene nanosheets and kenaf fibers with matrix. With 6 wt% PP-g-MA, the tensile strength and elastic modulus were increased by 18% and 75%, respectively. The addition of PP-g-MA to 5 wt% increased the flexural and impact strengths by 10% and 5%, respectively. From the entire experimental data, the optimum values for elastic modulus, as well as, tensile, flexural, and impact strengths in the blends were obtained to be 4 GPa, 33.7896 MPa, 57.6306 MPa, and 100.1421 J/m, respectively. Finally, samples were studied by FE-SEM to check the dispersion of graphene nanosheets, PP-g-MA and kenaf fibers in the polymeric matrix.

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Influence of layering pattern of modified kenaf fiber on thermomechanical properties of epoxy composites

Progress in Rubber Plastics and Recycling Technology ◽

10.1177/1477760619895010 ◽

2019 ◽

Vol 36 (1) ◽

pp. 47-62

Author(s):

AR Mohammed ◽

MS Nurul Atiqah ◽

Deepu A Gopakumar ◽

MR Fazita ◽

Samsul Rizal ◽

...

Keyword(s):

Mechanical Properties ◽

Chemical Modification ◽

Epoxy Matrix ◽

Epoxy Composites ◽

Woven Composites ◽

Fiber Reinforced ◽

Kenaf Fiber ◽

Kenaf Fibers ◽

The Impact ◽

Woven Kenaf

Natural fiber-reinforced composites gained considerable interest in the scientific community due to their eco-friendly nature, cost-effective, and excellent mechanical properties. Here, we reported a chemical modification of kenaf fiber using propionic anhydride to enhance the compatibility with the epoxy matrix. The incorporation of the modified woven and nonwoven kenaf fibers into the epoxy matrix resulted in the improvement of the thermal and mechanical properties of the composite. The thermal stability of the epoxy composites was enhanced from 403°C to 677°C by incorporating modified woven kenaf fibers into the epoxy matrix. The modified and unmodified woven kenaf fiber-reinforced epoxy composites had a tensile strength of 64.11 and 58.82 MPa, respectively. The modified woven composites had highest flexural strength, which was 89.4 MPa, whereas, for unmodified composites, it was 86.8 MPa. The modified woven fiber-reinforced epoxy composites showed the highest value of flexural modulus, which was 6.0 GPa compared to unmodified woven composites (5.51 GPa). The impact strength of the epoxy composites was enhanced to 9.43 kJ m−2 by the incarnation of modified woven kenaf fibers into epoxy matrix. This study will be an effective platform to design the chemical modification strategy on natural fibers for enhancing the compatibility toward the hydrophobic polymer matrices.

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Meat Quality, Aroma Profile and Consumer Preference of Dry-Aged Beef

Meat and Muscle Biology ◽

10.22175/mmb.10804 ◽

2019 ◽

Vol 3 (2) ◽

Author(s):

V. C. Francisco ◽

R. R. Tullio ◽

C. R. Marcondes ◽

S. B. Pflanzer ◽

R. T. Nassu

Keyword(s):

Volatile Compounds ◽

Meat Quality ◽

Shear Force ◽

Solid Phase ◽

Consumer Preference ◽

Test Method ◽

Average Weight ◽

Peanut Shell ◽

Red Color ◽

Paired Preference

ObjectivesAging is a method for improving some sensory characteristics of meat, enhancing flavor and tenderness. The effect of aging in tenderness is well known but not well established in the flavor of dry-aged beef. This study aimed to evaluate the meat quality, volatile compounds profile and consumer preference between fresh and dry aged beef.Materials and MethodsLongissimus thoracis and lumborum muscles (right side) from five steers of Canchim (5/8 Charolais × 3/8 Zebu) breed fed with the same pellet diet (25% peanut shell; 69.23% corn grain; 2.27% soybean meal; 1% sodium bicarbonate; 1.50% minerals; 1.00% urea and 0.03% monensine in dry matter) were used. Animals were slaughtered at 36 mo of age with 562 kg of average weight. After 24 h postmortem, from the muscles of approximately 30 cm length, half of each was deboned, cut into 2.5 cm width steaks (“fresh”). The other half, which were bone-in beef loins, were maintained at 1 ± 1°C and 70% relative humidity (“dry-aged”) in a refrigerated chamber for 28 d, deboned and trimmed. Fresh and dry-aged samples were analyzed for meat quality (color, pH, water holding capacity, cooking loss, and Warner-Bratzler shear force). The remainder of these samples were vacuum packaged and frozen for sensory and volatile compounds analyses. Volatile compounds extracted by Solid-phase microextraction technique (SPME) were analyzed by Gas Chromatography/Mass Spectrometry (GC–MS). Consumer paired preference was performed in two sessions, where the preferred sample should be chosen and analyzed by using a table Standard Test Method for Directional Difference Test (ASTM E2164-08). Meat quality and volatile compounds results were analyzed by t test.ResultsColor, pH, and shear force were significantly different (p < 0.05) between fresh and dry aged samples. Higher values (p < 0.05) of a* (20.6) and b* (16.8) parameters were found in the dry aged meat meaning greater red color intensity in the dry aged samples. Fresh samples showed the lowest values (5.45). The shear force values were lower (p < 0.05) for dry aged samples (3.60 kgf) if compared to fresh samples (7.9 kgf). A total of 58 volatile compounds were found in fresh and dry aging meat: 13 hydrocarbons (22.4%), 12 aldehydes (20.7%), 9 ketones (15.5%), 8 alcohol (13.8%), 6 aromatic compounds (10.3%), carboxylic acid (8.6%), 3 sulfur compounds (5.2%), 1 lactone (1.7%) and 1 pyrazine (1.7%). Thirty-nine compounds were common to both treatments being 37 of them with odoriferous importance. Only 3 compounds (2-ethyl, 1-hexanol, 3-ethyl-3-hexene, and octane) were found only in fresh meat. Thirteen compounds were found only in the dry aged meat samples, being the main ones of odoriferous importance: methional (cheddar cheese), heptanoic acid (cheese), 2, 3-butanediol (cocoa butter), dimethyl disulfide (kale), furan, tetrahydro-2-methyl- (roasted, crusted beef and chicken), butanoic acid (rancid), dimethyl trisulfide (sulfureous, grassy) and 3-Octanone (musty, mushroom, moldy and fermented cheese). In the paired preference test, 71 from 78 consumers preferred the dry aged sample, mentioning mainly the reason for the choice the tenderness and flavor.ConclusionDry-aged beef showed enhanced tenderness and red color compared to fresh beef. Many volatile compounds of odoriferous importance were found in the dry aged beef which contributes to its unique flavor, explaining why it was more preferred in this study.

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Bio-pellets Manufacture from Palm Fruit Skin as Renewable Alternative Fuels in Updraft Type Gasification Furnaces

International Journal of Design & Nature and Ecodynamics ◽

10.18280/ijdne.150617 ◽

2020 ◽

Vol 15 (6) ◽

pp. 913-920

Author(s):

Ridwan Abdurrahman ◽

Radja Masyita Aulya Syafitri ◽

Abrar Ridwan ◽

Lega Putri Utami

Keyword(s):

Alternative Fuels ◽

Raw Materials ◽

Combustion Efficiency ◽

Fruit Peel ◽

Biomass Waste ◽

Palm Fruit ◽

Suitable Alternative ◽

Average Value ◽

Fruit Skin ◽

Prior Processing

Biomass is a suitable alternative to be used as fuel, but the use of biomass without prior processing can cause respiratory disease. In Indragiri Hilir Regency, the utilization of palm fruit skin waste is still minimal. Bio-pellet is a fuel derived from biomass waste that has gone through a densification process. The process of making bio-pellets is carried out by refining the raw materials, mixing the adhesives, printing the raw materials that are pressed under high pressure, and drying. The results of the research on the bio-pellet characteristic test of Nipah fruit peel waste according to its parameters obtained an average value of 1.28% water content, 0.51% ash content, 21.3% flying substance content, 76.88% bound carbon content and weight. type 1.41 gr / cm3. For the combustion test in the updraft type gasification furnace with the addition of 0.5kg, 0.3kg and 0.2kg of fuel, the results obtained from the rate of fuel consumption are 0.041kg / minute, 0.033kg / minute and 0.033kg respectively. /minute. In the results of combustion efficiency, the value according to SNI 7926: 2013 is the addition of 0.5kg of fuel at the beginning of ignition and 0.2 kg at the end of ignition, which is 0.04.

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Trends of the energy and protein value of hylage from legumes in the Republic of Tatarstan

The Agrarian Scientific Journal ◽

10.28983/asj.y2021i2pp45-48 ◽

2021 ◽

pp. 45-48

Author(s):

Evgeny Olegovich Krupin ◽

Marsel Sharipzyanovich Tagirov ◽

Adelya Ayratovna Askarova

Keyword(s):

Energy Level ◽

Nutritional Value ◽

Raw Materials ◽

Net Energy ◽

Average Value ◽

Plant Raw Materials ◽

Digestible Protein ◽

The Republic ◽

Perennial Legumes

The results of the analysis of the dynamics of energy and protein nutritional value of haylage from perennial legumes harvested from plant raw materials in the territory of the Republic of Tatarstan in the period from 1993 to 2018 are described. The long-term average value of the studied indicator was 9.52 MJ / kg, which is 5.54% higher than the norm. The highest content of exchangeable energy was noted in 1996 - 9.67 MJ / kg, which is 1.58% higher than the long-term average. The lowest content of exchangeable energy was established in 2009 (9.36 MJ / kg). The long-term average value of the net energy level of lactation was 1.96 MJ / kg, which is 9.68% higher than the norm. The maximum was observed in 2017 and amounted to 2.17 MJ / kg, and the minimum - in 2001 (1.65 MJ / kg), when it was 23.97% below the norm. It was found that the average long-term value of the level of digestible protein in haylage was 111.31 g / kg, which is 1.78% higher than the norm. The highest content of digestible protein was found in 2010 (17.21%). The smallest value was recorded a year earlier, in 2009 and amounted to 95.64 g / kg, which, respectively, is lower than the average long-term value and the value of the norm by 14.08 and 12.56%, respectively.

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PENGARUH DIAMETER TIANG TERHADAP TAHANAN GESEK TIANG DALAM TANAH LEMPUNG

Construction and Material Journal ◽

10.32722/cmj.v1i3.2419 ◽

2019 ◽

Vol 1 (3) ◽

pp. 219-224

Author(s):

Andikanoza Pradiptiya ◽

A’isyah Salimah

Keyword(s):

Pile Foundation ◽

Structural Damage ◽

Tensile Load ◽

Frictional Resistance ◽

Test Method ◽

Scale Model ◽

Friction Resistance ◽

Average Value ◽

Constant Rate ◽

Pile Model

AbstractSome buildings impose limits on the foundation displacement that occur with relatively small values so as not to cause structural damage. The test method used was to make a model test box as a testing medium by simulating the actual model into the form of a scale model. The study was conducted using a single pile foundation with reduced scale, made of concrete with a diameter of 0.02 m, 0.03 m, 0.04 m and the length of each pile was 0.4 m. The pile model was mounted by pressing into the clay that had been compacted in the test box and then given a tensile load which refers to ASTM D3689-07 procedure E (Constant Rate of Uplift Test). Mobilization of pile friction resistance at critical displacement determined the frictional resistance of the ultimate pile units. The test results showed that the greater the diameter of the pile, the frictional resistance of the ultimate pile units would increase. The increase in frictional resistance of the ultimate pile units showed an average value of around 17.1%.Keywords : Pile foundation, Pile diameter, Friction resistance.AbstrakMeningkatnya pembangunan hunian mengakibatkan naiknya permintaan akan batako, hal ini tentunya Beberapa konstruksi bangunan memberikan batasan kepada perpindahan tiang yang terjadi dengan nilai yang relatif kecil supaya tidak menyebabkan kerusakan struktur. Metode uji yang dipakai adalah membuat box uji model sebagai media pengujian, dengan mensimulasikan model yang sebenarnya ke dalam bentuk model skala. Penelitian dilakukan menggunakan model pondasi tiang tunggal penampang lingkaran lingkaran skala tereduksi yang terbuat dari beton dengan diameter 0,02 m, 0,03 m, 0,04 m dan panjang masing-masing tiang adalah 0,4 m. Model tiang dipasang dengan cara ditekan pada tanah lempung yang sudah dipadatkan dalam box uji kemudian diberikan beban tarik yang mengacu pada ASTM D3689-07 prosedur E (Constant Rate of Uplift Test). Mobilisasi tahanan gesek tiang pada perpindahan tiang kritis menetukan tahanan gesek satuan ultimit. Hasil uji memperlihatkan bahwa semakin besar diameter tiang, tahanan gesek satuan ultimit tiang akan bertambah. Peningkatan tahanan gesek satuan ultimit tiang menunjukkan rata-rata sekitar 17,1 %.Kata kunci : Pondasi Tiang, Diameter Tiang, Tahanan Gesek Tiang.

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