Garuda - Garba Rujukan Digital

p-Index From 2021 - 2026

9.237

P-Index

This Author published in this journals

All Journal BERKALA FISIKA Sainstek SEMIRATA 2015 Jurnal Penelitian Pendidikan IPA (JPPIPA) Jurnal Ilmiah Pendidikan Fisika Spektra: Jurnal Fisika dan Aplikasinya JURNAL EKSAKTA PENDIDIKAN (JEP) JURNAL PENDIDIKAN TAMBUSAI Jurnal Teori dan Aplikasi Fisika Abdi Dosen : Jurnal Pengabdian Pada Masyarakat Pelita Eksakta Abdi: Jurnal Pengabdian dan Pemberdayaan Masyarakat Jurnal Humanities Pengabdian Kepada Masyarakat Jurnal Ilmiah Profesi Pendidikan Pillar of Physics Education : Jurnal Berkala Ilmiah Pendidikan Fisika Pillar of Physics: Jurnal Berkala Ilmiah Fisika Journal of Comprehensive Science MASALIQ: Jurnal Pendidikan dan Sains Journal of Innovative Physics Teaching (JIPT) Journal of Climate Change Society Physics Learning and Education Journal of Experimental and Applied Physics

Yenni Darvina

Universias Negeri Padang

Author-ID : 2523034

Religion Aerospace Engineering Agriculture, Biological Sciences & Forestry Humanities Astronomy Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Computer Science & IT Control & Systems Engineering Earth & Planetary Sciences Economics, Econometrics & Finance Education Electrical & Electronics Engineering Energy Environmental Science Health Professions Languange, Linguistic, Communication & Media Library & Information Science Materials Science & Nanotechnology Mathematics Medicine & Pharmacology Physics Public Health Social Sciences Other

Published : 176 Documents Claim Missing Document

Claim Missing Document

Articles

8 9 10 11 12

PEMBUATAN BAHAN AJAR INTERAKTIF BERMUATAN KARAKTER DENGAN PENDEKATAN SAINTIFIK PADA MATERI FLUIDA STATIK DAN DINAMIK FISIKA SMA KELAS XI Frima Suci Agustia; Yenni Darvina; Yurnetti Yurnetti
PILLAR OF PHYSICS EDUCATION Vol 9 (2017)
Publisher : Universitas Negeri Padang

Learning demanded by the of 2013 curriculum is learning to student-centered, interactive, multimedia-based, and use the scientific approach. In addition, the 2013 curriculum teachers are required provide character education to students. One of the factors supporting the creation of learning is learning resource. Learning resources is expected to help the learning process and facilitate the learners’ needs such as the learning style. These learning resources are in the form of teaching materials, handouts, modules, and worksheets. However, the teaching materials used by teachers do not correspond to the demands of the 2013 curriculum and has not met the learners’ needs. Teaching materials are used in the form of printed teaching materials that have not been based on multimedia. Instructional materials are still a bit implicitly contains character values. LKS used to load materials and evaluation questions not contain simple experiments using the scientific approach. Therefore, the need to design interactive teaching materials charged character with a scientific approach. This study aims to produce products such as interactive teaching materials charged character with the scientific approach to the static and dynamic fluid material valid.This research is the development (research and development) using 4-D model of development which is reduced to 3-D with the definition phase (define), design (design), and development (develop). Subjects were 5 people validator ie 3 people physics professor FMIPA UNP and 2 physics teachers SMAN 6 Padang. Data were analyzed with descriptive analysis techniques.Teaching materials include text, sound, animation, music, and video. Teaching materials containing character values and scientific approach. Based on research that has been done, has produced products such as interactive teaching materials charged character with a scientific approach. Products are categorized valid study of aspects of material substance with an average value of 88%, appearance (visual communication) with an average value of 88.6%, the design of teaching materials with an average value of 89.7%, and the use of software to the average value -rata 93.3%.

Pengembangan LKS Berbasis Virtual Laboratory Melalui ICT pada Materi Besaran dan Vektor Kelas X SMA Fitrah Ayu; Masril Masril; Yenni Darvina; Hidayati Hidayati
PILLAR OF PHYSICS EDUCATION Vol 11, No 1 (2018)
Publisher : Universitas Negeri Padang

This research aims to determine the feasibility or properness of student worksheet based on virtual laboratory through ICT in studying quantity and vector among student in tenth grade of senior high school. In order to reach this goal, the R&D research is held which consist of: potential problem, data collection, product design, design validation, and product testing or product trial. Data are analyzed by using technique of statistical graph. The object in this research is virtual laboratory based-student worksheet through ICT. The result of data analysis show that : the average validity test is 90 in valid category, the average practicality test of teacher is 86 in practical category, and the average practicality test of student is 83 in practical category. With those results, the virtual laboratory based-student worksheet through ICT valued as proper to be used during the learning process of quantity and vector for the tenth grade student in senior high school.

Validitas LKS berbasis problem solving bermuatan critical thinking skill pada materi alat optik dan pemanasan global fisika SMA/MA Nadila Putri Bungsu; Yenni Darvina; Wahyuni Satria Dewi; Amali Putra
PILLAR OF PHYSICS EDUCATION Vol 12, No 4 (2019)
Publisher : Universitas Negeri Padang

The 21st century demands skills that can support human life. Human life is never separated from the various demands that require them to have quality resources so as to make a large contribution to their lives and the lives of the nation. One of the 21st century skills is the 4C skill, namely communication skills, critical thinking skills, collaboration skills and creativity skills. With these 4C skills, students are expected to be ready to face life's challenges and to have quality resources so they don't miss the flow of life and have good competitiveness. In LKS things that we can see from the 4C skills are critical thinking skills, for that in designing LKS we can further highlight them on critical thinking skills, while other 4C skills can be reviewed in the student learning process. However, in learning at SMA N 1 SUTERA 4C skills, especially critical thinking skills have not been fully applied, even though it is really needed. This research belongs to the type of R&D (Research and Development) contained in Sugyono's book. In this discussion we will only see the results of product validity.After product validation, 84.25% was obtained and is in the very valid category. This states that the worksheet can already be used in learning physics

Pengaruh komposisi terhadap ukuran butir lapisan nanokomposit CoFe2O4/PVDF dengan metode spin coating (The influence of composition to the grain size of the CoFe2O4 / PVDF nanocomposite layer by using the spin coating method) Diana Putri; Yenni Darvina; - Ramli; - Yulkifli
PILLAR OF PHYSICS Vol 12, No 2 (2019)
Publisher : Department of Physics – Universitas Negeri Padang UNP

The study of nanocomposites have been done much by researchers. Nanocomposites is a mixture of nanoparticle powder consisting of two materials called matrix and filler. The filler used in this study is CoFe2O4 and the matrix is PVDF. This study advantageous for investigating the micro structure of CoFe2O4/PVDF nanocomposite layer. The micro structure to be is the size of crystals, the micro strains, the size of grains and the thickness of nanocomposite layers. It is a research experiment that uses variations in composition 10 ml : 10 ml, 10 ml : 20 ml, 10 ml : 30 ml. The characterization tools used were X-ray Diffraction (XRD) and Scanning Electron Microscope (SEM). XRD is used to get the corner of two theta and a half peak width (FWHM) from a layer of nanocomposite. SEM characterization gets to morphology of the surface and the thickness of nanocomposite layers. The thickness of a nanocomposite layer obtained is that 25.11 m, 29.81 m, and 35.51 m. Based of research already done, the more thickness of a nanocomposite layers the size of crystals and micro strains has also increased.

Pengaruh kerapatan terhadap koefisien absorbsi bunyi papan partikel serat daun nenas (Ananas comosus L Merr) (Effect of density on sound absorption coefficient of pineapple leaf fiber particle board (Ananas comosus L Merr)) Wahyudil Hayat; - Syakbaniah; Yenni Darvina
PILLAR OF PHYSICS Vol 1 (2013)
Publisher : Department of Physics – Universitas Negeri Padang UNP

ABSTRACTThe main objective of this study was to determine the effect of density on board sound absorption coefficient of the particle board pineapple leaf fiber which will be applied as a silencer. Preparation of the sample begins with the separation of basic ingredients, followed by the manufacture of rectangular samples with a size of 9 × 9 × 0.5 cm using a machine felts, then the acoustic characteristics of the specimens were tested using a resonance tube. From the research that has been done can be concluded that at low density the greater the density of the sound absorption coefficient of the particle board pineapple leaf fiber, the greater the coefficient absorbsinya. At high density, the sound absorption coefficient down.Keywords: absorption coefficient, pineapple fiber, acoustic material.

Pengaruh suhu sintering terhadap sifat penyerap gelombang mikro dari nanokomposit CoFe2O4/PVDF yang di preparasi dengan metode sol-gel (Sintering temperature effect on the microwave-absorbing properties of the CoFe2O4 / PVDF nanocomposites prepared by the sol-gel method) Yona Sri Mantia; - Ramli; Yenni Darvina; - Desnita
PILLAR OF PHYSICS Vol 12, No 2 (2019)
Publisher : Department of Physics – Universitas Negeri Padang UNP

This number applications of microwaves are numerous so that it produces microwaves that emit. If it is not in control, there will be interference with electromagnetic signals. This also causes disruption of the working system of the Neighborhood. CoFe2O4/PVDF nanocomposite synthesized by the sol-gel method for microwave preparation was completed. Making materials to absorb microwaves uses five variations of sintering temperature, namely 250℃, 280℃, 350℃, 400℃, and 450℃. The sintering process is carried out using a furnace. The presence of a single phase on CoFe2O4/PVDF nanocomposite was characterized using X-Ray Difraction (XRD), to see the functional groups using Fourier Transform Infrared (FTIR), and to help wave use carried out using Vector Network Analyzer (VNA). This study discusses the sintering of microwave absorbers.The characterization results using VNA get a maximum Reflection Loss value of -29,7051 dB at a temperature of 400℃, frequency of 11.76 GHz, with absoption coefficient 96%. Different sintering temperatures produce a large amount of different absorptions. Nanocomposite which has a large value of reflection loss does not necessarily have a large answering tape width. The quality of materials that are good for microwave absorbers must also consider the value of the width of the capture band.The best absorption occurs at a temperature of 450 ℃ because have a maximum reflection loss value -21.116 dB, frequency of 6.00 GHz, absorption band widht 0.54 GHz, and absoption coefficient 91%.

The effect of composition MnFe2O4 / PANi nanocomposite on the microstructure that synthesized by spin coating method Lucya Sinurat; Yenni Darvina; - Ramli; - Ratnawulan
PILLAR OF PHYSICS Vol 13, No 2 (2020)
Publisher : Department of Physics – Universitas Negeri Padang UNP

Manganese ferrite has the structure of MnFe2O4 which in the process of making it uses manganese mineral powder. Based on the MnFe2O4 testing is one material that is suitable for use as a composite by mixing other binders in it. Polyaniline (PANi) is a polymer that can be used as a binding material which is an attractive conductive polymer because it has unique properties and good thermal stability. This research was conducted by making three variations of the composition of MnFe2O4 / PANi namely 40%: 60%, 50%: 50%, and 60%: 40% made using the spin coating method. This research was conducted to investigate the effect of composition on the microstructure of the MnFe2O4 / PANi nanocomposite layer using the spin coating method. The microstructure to be investigated is the functional group of grain size and thickness of the nanocomposite layer. The tools used in this study are Fourier Transform Infrared (FTIR) used to obtain the functional groups of nanocomposite layers, X-ray Diffraction (XRD) is used to get the size of crystals and microstructure of crystals, and the Scanning Electron Microscope (SEM). Characterization and Scanning Electron Microscope (SEM) are used to obtain grain size and thickness of the nanocomposite layer. The results of the FTIR characterization are the functional groups of MnFe2O4 / PANi which produce absorption bands at wavenumbers 3214.85 cm-1, 3353.86 cm-1, and 3214.03 cm-1, which are O-H groups. The absorption band at wavenumbers 717.00 cm-1, 763.94 cm-1, and 747.31 cm-1 is the C-H group showing PANi. Absorption peaks that are below 1000 cm-1 that is at wavenumbers 874.78 cm-1, 924.18 cm-1, and 895.96 cm-1 show indications of Manganese Ferrit. The results of the XRD characterization were crystal size and microstrain, each of which had a crystal size composition of 49.90478417 nm, 45.29656118 nm, and 44.52213202, and then for the value of the microstrain, each variation was 0.116667149, 0.15983276, and 0.183718732. Then from SEM characterization results obtained grain size values of 0.445 μm, 0.426 μm, 0.318 μm, while the thickness obtained for each variation is 1.29 μm, 2.02 μm, and 2.20 μm. Based on the results of the study, the greater the addition of PANi composition given, the value of crystal size, grain size also increases while the value of microstructure and thickness decreases.

Pengaruh komposisi MnFe2O4 terhadap sifat magnetik nanokomposit MnFe2O4 / PVDF yang di preparasi dengan metode spin coating (The effect of the MnFe2O4 composition on the magnetic properties of the MnFe2O4 / PVDF nanocomposites prepared by the spin coating method) Romizah Marta; Yenni Darvina; - Ramli; - Desnita
PILLAR OF PHYSICS Vol 13, No 1 (2020)
Publisher : Department of Physics – Universitas Negeri Padang UNP

Now is the age of the "Internet of things", where physical devices are able to exchange information between information sources connected to the system. To build a system, it takes a components device which in the manufacturing process is made into Nanocomposites. In this research, the materials used as Nanocomposites are Manganese ferrite (MnFe2O4) and Polyvinilidene Flouride (PVDF). Then the method used is the Spin Coating. The Spin Coating Method is used to grow a thin layer of MnFe2O4 / PVDF Nanocomposites. In the process of making Nanocomposites, Manganese and Iron are used as precursors. In this research, researcher used five variations of the composition of MnFe2O4 / PVDF Nanocomposites, namely 25% : 75%, 33.33%: 66.67%, 50% : 50%, 66.67%: 33.33% and 75%: 25%. There are three characterization tools used in this research namely XRD, FTIR and VSM. The results of XRD characterization as supporting data in this research show each peak has a different angle of 2Ө, intensity, FWHM value and Miller Index. Crystal form of PVDF is Monoclinic and Crystal form of MnFe2O4 is Cubic. The results of FTIR characterization as supporting data found two functional groups, namely Fe-O and CH2. For Fe-O is the MnFe2O4 Function Group, and CH2 is the PVDF Function Group or (C2H2F2)n. The results of the characterization of VSM as the results of the study show the relationship between the variation of the composition of the MnFe2O4 / PVDF Nanocomposites with Saturation Magnetization which tends to decrease which is worth 2.07 at 25% : 75% composition, 1.11 at 33.33% : 66.67% composition, 1 at 50% : 50% composition, 1.54 at 66.67% : 33.33% composition and 1.09 at 75%: 25% composition. The same result also occurs in the relationship of composition variation with Remanent Magnetization, which is worth 0.37 at 25% : 75% composition, 0.35 at 33.33% : 66.67%, 0.47 at 50% : 50% composition, 0.31 at 66.67% : 33.33% composition, 0.25 at 75% : 25% composition. Furthermore, the results of the relationship of variations in the composition of MnFe2O4 / PVDF nanocomposite with Coercivity is high low Coercivity values. This shows the change in nature from Hard Magnetic to Soft Magnetic. The value of Coercivity is 297.08 at 25% : 75% composition, 144.96 at 33.33%: 66.67% composition, 274.05 at 50% : 50% composition, 300.53 at 66.67% : 33.33% composition and 196.57 at 75% : 25% composition.

Pengaruh fraksi konsentrasi nanokomposit Fe3O4/PANi dengan metode sol-gel spin coating untuk material elektroda baterai lithium (Effect of Fe3O4 / PANi nanocomposite concentration fraction by sol-gel spin coating method for lithium battery electrode material ) Varadila Sahanaya; - Ramli; Yenni Darvina
PILLAR OF PHYSICS Vol 11, No 2 (2018)
Publisher : Department of Physics – Universitas Negeri Padang UNP

In this modern era, technological developments in the field of electronic devices are progressing very rapidly. Therefore, this triggers the demand for storage of electrical energy, one of which is a lithium battery. The performance of the lithium battery depends on the electrode material used. The purpose of this study was to investigate the effect of Fe3O4 concentration on Fe3O4/PANi nanocomposite electrical properties by sol gel method for lithium battery electrode material. In this study, the growth of Fe3O4/PANi nanocomposite layers using spin coating method with a concentration variation of 30%, 40%, 50%, 60% and 70%. Magnetite was prepared using sol-gel technique with precursors (Fe(NO3)3.9H2O). Then the precursor was mixed with PANi polymer with varied concentrations. The results of Fe3O4/PANi Gel are coated on a glass substrate followed by a drying process. Fe3O4/PANi nanocomposite layers were characterized using X-Ray Diffraction and Scanning Electron Microscopy and LCR meters. The results of this study indicate that at a concentration of 30% to a concentration of 40% there is a decrease but at a concentration of 50% an increase in the size of the crystal and at a concentration of 60% to 70% decreased again. FTIR results show the molecular bond formed and the results of SEM imaging show the thickness of the nanocomposite layer. As well as conductivity and electrical capacitance obtained through characterization using LCR meters which are 6.91218303 S/cm and 2.69 x10-10F.

Proses pembentukan feofotin daun suji sebagai bahan aktif photosensitizer akibat pemberian variasi suhu (The process of forming suji leaves feofotin as an active ingredient in the photosensitizer due to temperature variations) Ari Arfandi; - Ratnawulan; Yenni Darvina
PILLAR OF PHYSICS Vol 1 (2013)
Publisher : Department of Physics – Universitas Negeri Padang UNP

ABSTRACTCancer is one kind of disease that has difficulties to treat, can be cured by using drugs which derived from natural materials in Indonesia. This treatment know a cancer treatment that uses three important factors such as the photosensitizer, oxygen and light, whereas this cancer therapy called photodynamic therapy (TFD). Photosensitizer which is required can be obtained from the suji leaves (Pleomele angusti-folia NE Brown) that were heated. The purpose of this researchs determined the content amount of chlorophyll content that suji leaves before it was heated, and knew the maximum temperature required to produce feofitin with maximum absorbance value moreover, determined purpose of this research the correlation feofitin absorbance value and the number of chlorophyll content in suji leaves after heating process. Base heating process on the research conducted, the amount of chlorophyll content which in suji leaves have heating process is 11,26453 μg / ml, in addition the maximum absorbance value feofitin on process at 900C with a maximum absorbance value is 1,90130 μg / ml. moreover a correlation between the total value absorbance with the amount of content chlorophyll in the suji leaves, however the relationship is not continuous. Keywords: suji leaves, feofitin, photosensitizer

Co-Authors - Afrizal - Rahmi - Ramli - Ramli - Syakbaniah - Yulkifli - Yulkifli Abdul Azis Abdul Aziz Ade Aprilia Ade Usra Berli Afdatul Zikri Ahmad Fauzi Aifah Fauziah Akmam Akmam Alif Yulanda Putri Almunazar, Fauziyah Alqadri, Dheo Alwi Nofriandi Amali Putra Ambran Hartono amira tiara wulandari Andari Oktafiani Anisa Meysi Wardi Annisa Febriani, Annisa Anofa Liona Anwar, Suci Aprilia Cahaya Ari Arfandi arifaldi arifaldi Asfaha, Auzha Hira Asrad Hafizah Asrizal Asrizal Asrizal Atika Dwi Maharani Zuler Audia, Washilla Aulia, Mhd Reyfanza Aulia Azca Aryadiva Mahengga Azura Carolina Harsani Azzahra, Zakia Bella Salsa Bella Sukma Putri Chairunnas Chairunnas Cici Ramayanti Dara Putri Pratama Desnita Desra Yarsina Dicko Maulana Syahdan Diffa Azilia Dila Alhumaira Dola Afriyenti Edi Sanjaya Elsa Imelda Elsa Okta Memori Elsa Rahmayuni everly aberta Fadhila Ulfa Jhora Fadilla Septiani Fadillah Ulfah Fakhrur Rhozy Fani, Meylin Sir Fanny Rahmatina Rahim Fatni Mufit Fatni Mutfit Fauziyah, Faadhilah Febrian Syah Febrian, Nanda Festiyed Fio Adella Illahi Firda Annisa Fitrah Ayu fitri rahmi Fitria Murti Fran Surya Andi Fredy Pratama Frima Suci Agustia Fuja Novitra Gina Fadilah NST Gusnedi Gusnedi Gusnedi Gusnedi Gusnedi, - Gustika Yonanda Hamdi Rifai Hardina, Yuli Harman Amir Hasya Syahmi Hazrati Ashel Hersha Hanifa Hidayati Hidayati Hidayati Hidayati Hidayati Hidayati Hifzi, Zudiya Hilmi Rizki Anjani Hrp, Abdul Maulub Hufri Hufri Ihsania Ikrima Kinanti Ilahi, Fitratul Indah Safira Indah Septia Ningsih Indah Tri Handini Indri Syukra Innes Andriani Iryani Iryani Ismathul Dinny Jasmine, Alifa Jhora, Fadhila Jhora, Fadhila Ulfa Jhora, Fadhilla Ulfa Kasih Syirpia Khairunnisa Khairunnisa Kuwat Triyana Lestra, Dila Ayu Letmi Dwiridal Lidya Agraini Lucya Sinurat Lusi Oktavia Masril Masril Masril Masril Masril Masril masril masril Masril Masril Melani Alvino Miftahurrahmah Miftahurrahmah, Miftahurrahmah Muhammad Ikmal Muhammad Rivai Murtiani Murtiani Murtiani Murtiani Mustika, Dian Putri mutia faizah apriani Mutia Risma Mutia Yussavel Navis Nabila, Aliya Nadia Ardianti Nadia Ramadhanty Nadila Putri Bungsu Nadya Aztifa Nadya Yunestika Nawiyah, Nawiyah Nazifah, Naurah Nia Nursurila Nidya Yulfriska Nidya Yulfriska Novelia Prima Nur Anisa Nur Sahfitri Nurhasanah Nurhasanah Nurhijjah Tiur S Nurmala Sari Lubis Oktavia, Vini Onny Gustira Pakhrur Razi Pertama, Indri Saputri Pratama, Rayvol Dion Pratiwi Mailisa Prima Nora Ananda Puput Mulya Sari Pusri Mela Putra Adil Putra, Amali Putri Diana Putri Dwi Sundari Putri Rasti Ramadhani Radha Firaina Rahma Tilla Dwi Lestari Rahma Yeni Rahmadini, Fadhilla Rahmat Hidayat Rahmat Hidayat Rahmi Zulva Ramadhani, Dinda Ramli Ramli Ramli Ramli Ramli Ramli Ramli Ramli Ramli Ramli Ramli Ramli, - Rara Nur Rida M.Y Ratnawulan . Renol Afrizon Resti Novela Retna Junia Revi Febrina Sari Ria Monica Rifi Wasrika Rima Melani Putri Rio Anshari Riolin Putri Artiwi Riri Jonuarti Riri Raihannil Jannah Riyasni, Selma rizka fauziah Rizki Rizki Romizah Marta Salma Amalia As Shidiq Santika, Viera Alvio Sari, Mona Berlian Septia, Zahwa Setivawani, Andrisa Shinta Kumala Silmi Hidayatullah03 Silvi Trisna Silvi Yulia Sari Siti Riva Darwata Slivi Yulia Sari Solly Aryza Sonia Nur Riza Sovia Yulianti Srisa Oktaweri Suci Wahyuni Suherman, Dea Stivani Suryani Fadhilah Syafri, Syafri Syafriani - - Syafriani Syafriani Syafriani Syafriani Syafriani Syafriani Syafrinaldi Syafrinaldi Syahputra , Ilham Syair Nandi Tiwi Novalia Syahari Tri Agunaisy Tria Sukma Sandi Trio Junira Fernando Ulfa Jhora, Fadhila Ulfa Jhora, Fadhilla Ully Nuraidina Ummiatul Fitri Vanessa Febta Sindani Varadila Sahanaya wahyu dilla abdullah Wahyudil Hayat wahyuni hafnisyah Wahyuni Satria Dewi Widara, Rofifah Windri Suci Gaitari Yeni Mustika Sari Yogi Putra Yohandri Yohandri Bow Yolvi Oktaviani Yona Sri Mantia Yosi Febriani Yudha, Fauzan Syafril Yulhendri Yulhendri Yulia Febrina Yulia Sari, Silvi Yulkifi Yulkifi Yulkifli Yulkifli Yulkifli Yulkifli Yulkifli Yulkifli, Y Yunita Ela Saputri Yuri Yanti Yurnetti Yurnetti Yurnetti Yurnetti Yurnetti, Yurnetti Zakiya, Zara Zara Zakiya Zoni, Muhammad Ari Zulhendri Kamus Zulma, Degito

Title

Found 176 Documents
Search

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Title Search

Found 176 Documents Search

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Title

Found 176 Documents
Search