Log in

Relevant bibliographies by topics / Alkalin

Contents

Journal articles
Dissertations / Theses
Books
Book chapters
Conference papers
Reports

Academic literature on the topic 'Alkalin'

Author: Grafiati

Published: 4 June 2021

Last updated: 18 June 2025

Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles

Select a source type:

Consult the lists of relevant articles, books, theses, conference reports, and other scholarly sources on the topic 'Alkalin.'

Next to every source in the list of references, there is an 'Add to bibliography' button. Press on it, and we will generate automatically the bibliographic reference to the chosen work in the citation style you need: APA, MLA, Harvard, Chicago, Vancouver, etc.

You can also download the full text of the academic publication as pdf and read online its abstract whenever available in the metadata.

Journal articles on the topic "Alkalin"

1

Kołodziej, Barbara. "The effect of foliar fertilization with Alkalin PK in American ginseng culture." Agronomy Science 63, no. 1 (2008): 96–103. http://dx.doi.org/10.24326/as.2008.1.10.

Full text

Abstract:

American ginseng (Panax quinquefolium L.) is a famous medicinal plant with adaptogenic, immunostimulating and anti-aging properties. In four-year-lasting field experiment located on light loamy sand soil the effect of foliar fertilization with 0.33% Alkalin PK 10:20 (foliar fertil-izer with very high pH-11.5) as well as Alkalin with fungicides on American ginseng yields and morphological parameters were examined.Twice a year Alkaline PK application as well as Alkalin with fungicides positively affected American ginseng root, stem, laeves quality parameters as well as the weight of fruits and seeds. Alkalin also limited plant disease infestation and as a consenquence increased plant population in four consecutive years of vegetation. The applications were connected with higher accumulation of phosphorus and potassium in plant tissues.

APA, Harvard, Vancouver, ISO, and other styles

2

Widnyana, I. Nyoman Suta, I. Made Alit Karyawan Salain, I. Nyoman Sutarja, and Ida Bagus Rai Widiarsa. "BERAT VOLUME PEREKAT GEOPOLIMER BERBAHAN DASAR ABU SABUT KELAPA." Jurnal Ilmiah Teknik Sipil 26, no. 2 (2022): 113. http://dx.doi.org/10.24843/jits.2022.v26.i02.p04.

Full text

Abstract:

Penelitian ini menyajikan pengaruh perbandingan antara prekursor dan aktivator alkalin pada berat volume perekat geopolimer. Perekat geopolimer menggunakan bahan dasar dari abu sabut kelapa (ASK) sebagai prekursor yang mengandung: SiO2 (8,24%), K2O (70,6%), Cl (14,1%), P2O5 (2,3%) dan Fe2O3 (2,25%). Digunakan aktivator alkali: natrium silikat (SS) dan larutan natrium hidroksida (SH) dengan konsentrasi molar 14M. Tujuan pengujian berat volume adalah untuk mengetahui tingkat kepadatan material penyusun perekat geopolimer.Variasi proporsi campuran prekursor (P) dan aktivator alkalin (A) digunakan perbandingan: 70%:30%; 75%:25%; 80%:20% serta perbandingan antara aktivator alkalin Na2SiO3 (SS) dan larutan NaOH (SH) sebesar: 1:1; 1,5:1; 2:1 terhadap berat prekursor. Benda uji dicetak dalam bentuk kubus dengan ukuran (50x50x50)mm serta diuji pada umur spesimen 7 dan 28 hari. Standar pengujian berat volume mengacu pada SNI 1973:2008. Hasil pengujian menunjukkan bahwa peningkatan perbandingan P/A dan SS/SH, akan menghasilkan nilai berat volume yang semakin meningkat sedangkan nilai berat volume semakin menurun sebesar 1,3% - 1,4% seiring dengan peningkatan umur spesimen.

APA, Harvard, Vancouver, ISO, and other styles

3

Bahar, Mardiyansyah, and Mariana Manik. "GAMBARAN AKTIVITAS ENZIM ALKALIN PHOSPHATASE PADA PENDERITA HEPATITIS B." Mitra Raflesia (Journal of Health Science) 15, no. 1 (2023): 119. http://dx.doi.org/10.51712/mitraraflesia.v15i1.143.

Full text

Abstract:

<p><strong>Latar Belakang</strong> : Penyakit peradangan pada sel-sel hati merupakan istilah umum dari Hepatitis. Penyebab hepatitis dapat disebabkan oleh Infeksi (Virus, bakteri, parasit), obat-obatan (termasuk obat tradisional), konsumsi alkohol, lemak yang berlebih dan penyakit autoimmune. Hepatis virus dapat disebabkan oleh virus Hepatitis A (HAV), Hepatitis B (HBV), Hepatitis C (HCV), Hepatitis D (HDV), dan Hepatitis E (HEV) yang mana diantaranya dapat menjadi penyebab penyakit hepatitis (Datin, 2014).<strong></strong></p><p>Aktivitas enzim alkali fosfatase (alkaline phosphatase/ALP) dan terdapat didalam darah menjadi penanda terjadinya gangguan fungsi hati karena normalnya terdapat didalam sel-sel hati. Kerusakan pada organ hati ini yang akan menyebabkan enzim terlepas ke dalam aliran darah (Ermanita dkk, 2020). </p><p><strong>Metode </strong>: Penelitian yang digunakan adalah penelitian deskriptif menggunakan teknik pengambilan sampel dengan <em>total sampling</em> dan sampel dalam penelitian ini berjumlah 10 orang. Penelitian ini dilakukan di Laboratorium Kimia Klinik RSUD dr. M Yunus Bengkulu.</p><p><strong>Hasil</strong> : hasil pemeriksaan aktivitas enzim alkalin phosphatase menunjukkan adanya peningkatan aktivitas enzim alkalin phosphatase pada penderita hepatitis B dengan rata – rata persentase peningkatan sebesar 40,42% dari nilai normalnya.</p><p><strong>Simpulan</strong> : Disarankan agar senantiasa menjaga kebersihan dan menerapkan pola hidup sehat agar senantiasa dapat terhindar dari penyakit seperti hepatitis.</p><p><strong>Kata Kunci : <em>Hepatitis B, Alkaline Phosphatase.</em></strong></p>

APA, Harvard, Vancouver, ISO, and other styles

4

Usman, Ediar, and Udaya Kamiludin. "LINGKUNGAN DAN EVOLUSI TEKTONIK BATUAN DAN SEDIMEN BERDASARKAN UNSUR KIMIA UTAMA DI PERAIRAN BAYAH DAN SEKITARNYA, PROVINSI BANTEN." JURNAL GEOLOGI KELAUTAN 12, no. 3 (2016): 125. http://dx.doi.org/10.32693/jgk.12.3.2014.252.

Full text

Abstract:

Pengeplotan data unsur kimia pada diagram SiO2 vs K2O untuk sampel sedimen dasar laut cenderung terjadi kenaikan SiO2 dan penurunan K2O, sehingga arah evolusi berkembang dari kalk-alkalin sedang ke kalk-alkalin rendah (toleitik). Pada sampel batuan beku dan sedimen hasil pemboran memperlihatkan pola evolusi magma sebaliknya, terjadi kenaikan SiO2 dan K2O dalam seri magma yang sama (toleitik). Kondisi ini diperkuat oleh diagram segitiga AFM (A = Na2O+K2O; F = FeOtotal ; M = MgO) yang menunjukkan sebagian besar sampel yang diplot berada antara toleitik dan kalk-alkalin sedang. Hasil ini memberi kesimpulan bahwa batuan ini bersifat transisi antara toleitik dan kalk-alkalin sedang, dan condong ke arah seri toleitik sebagai indikasi batuan berasal dari daerah samudera. Berdasarlan pengeplotan pada diagram segitiga TiO2 â€“ 10MnO â€“ P2O5, lingkungan tektonik batuan beku di pantai Cibobos, sedimen dasar laut dan sedimen pemboran pada umumnya berada pada lingkungan tektonik andesit kepulauan samudera dan sebagian busur benua. Hasil tersebut, maka dapat disimpulkan bahwa sedimen di daerah Bayah berhubungan dengan seri magma dengan afinitas rendah mulai toleitik hingga kalk-alkalin sedang dan batuan samudera yang menyusup ke busur kepulauan atau busur benua. Hasil ini dapat mengetahui lingkungan dan evolusi batuan sumber sehingga diharapkan bermanfaat dalam kegiatan ekplorasi sumber daya mineral dan energi di masa mendatang.  Kata kunci: unsur kimia utama, lingkungan tektonik, evolusi, kerak samudera dan kontinen, perairan Bayah   Plotting of major elements data of the seafloor sediment samples on diagram of SiO2 vs K2O tends to increase the SiO2 and decrease the K2O, therefore the direction of evolution develop from medium to low calc-alkaline (tholeitic). From igneous rocks and drilling sediment samples shows that the evolution magma has the opposite pattern, increasing of SiO2 and K2O in the same magma series ( tholeitic). This condition is confirmed by the triangular diagram of AFM (A = Na2O+K2O; F = FeOtotal ; M = MgO) that shows the most of plotted samples are between medium calc-alkaline and tholeitic. This result give a conclusion that these rocks are at transitional area between tholeitic and medium calc-alkaline, and tend towards tholeitic series as an indication of rocks from oceanic zone. Based on plotting on the triangular diagram of TiO2 - 10MnO - P2O5, tectonic environment of igneous rocks in the coast of Cibobos, surface and drilling sediment samples, in general these samples are in the tectonic environment of oceanic islands andesite and partial of continental arc. From this study, it can be concluded that the sediment in the Bayah area is associated with affinity magma series from low kalk-alkaline (tholeitic) to medium calc-alkaline, and oceanic crust is being subducting to continental arc. This result could recognize the environment and the evolution of source rocks, therefore it may useful in the exploration activities of mineral and energy resources in the future.   Keywords: major elements, tectonic environment, evolution, continental and oceanic crust, Bayah waters.

APA, Harvard, Vancouver, ISO, and other styles

5

Sriyanti, Sriyanti. "Pengaruh Pemerangkapan Enzim Alkalin Fosfatase ke dalam Silika dari Abu Sekam Padi terhadap Aktivitas Enzimatiknya." Jurnal Kimia Sains dan Aplikasi 20, no. 1 (2017): 42–47. http://dx.doi.org/10.14710/jksa.20.1.42-47.

Full text

Abstract:

Alkalin fosfatase telah diperangkap ke dalam silika dari abu sekam padi melalui proses sol-gel. Dalam prosedur ini, larutan silika dihasilkan melalui ekstraksi abu sekam padi menggunakan larutan natrium hidroksida 1,5 N. Larutan asam klorida 0,1 N ditambahkan untuk menurunkan pH larutan silika hingga 10. Alkalin fosfatase (dalam larutan buffer tris-HCl pH:8) ditambahkan ke dalam larutan silika, didiamkan di dalam desikator hingga terbentuk gel. Gel kering merupakan enzim terperangkap (terenkapsulasi). Parameter katalitik dan kinetik ditentukan baik untuk enzim bebas dalam larutan maupun untuk enzim terimobilisasi. Hasil menunjukkan bahwa pH dan suhu optimal untuk alkalin fosfatase terimobilisasi dalam silika adalah 9,0 dan 45◦C, lebih tinggi dibandingkan dengan bentuk bebasnya (8,5 dan 40◦C). Pada suhu kamar dan pH 8,5, konstanta Michaelis-Menten (Km) adalah 7,50 mM dan aktivitas spesifiknya adalah 0,051 U/mg enzim untuk alkalin fosfatase terenkapsulasi, sedangkan untuk alkalin fosfatase bebas dalam larutan berturut-turut 0,08 mM dan 1,041 U/mg enzim.

APA, Harvard, Vancouver, ISO, and other styles

6

Simamora, Bernadetta S. D., Brigitta N. R. Purnomo, Edward K. S. Limijadi, and Nadia Hardini. "Effect of Strawberry Extract (Fragaria x ananassa) towards Discoloration of Artificial Teeth due to Tea Immersion." e-GiGi 10, no. 2 (2022): 255. http://dx.doi.org/10.35790/eg.v10i2.41100.

Full text

Abstract:

Abstract: Discoloration of acrylic resin teeth can cause esthetic problem. Alkaline peroxide is commonly used as a denture cleanser, however, due to its side effects, an alternative material such as strawberry (Fragaria x ananassa) that contains ellagic acid and malic acid can be used to whiten and clean the teeth. This study was aimed to determine the effect of strawberry extract with concentrations of 65%, 75%, 85%, and 95% towards discoloration of artificial tooth due to tea immersion. This was an experimental laboratory study with a pre-test and post-test control group design. Artificial teeth made from acrylic resin were tested for color changes after immersion in tea for seven days followed by immersion in strawberry extract with concentrations of 65%, 75%, 85%, 95%, and alkaline peroxide for seven days. Color measurement was carried out using the chromameter and CIE L*a*b* system. Paired t-test showed a significant difference (p<0.05) in all values of 'L', 'a', and 'b' groups before and after treatment except for the value of 'b' immersion with alkaline peroxide and 75% strawberry extract. One way Anova test showed significant results in all groups. The strongest to the weakest tea stain cleanser was the group of 95% strawberry extract, 85% strawberry extract, alkaline peroxide, 75% strawberry extract, and 65% strawberry extract, respectively. In conclusion, strawberry extract at 65%, 75%, 85%, and 95% concentration affected the brightness of discolored artificial tooth due to tea immersion. The best change in brightness occurred at 95% concentration of strawberry extract.Keywords: strawberry extract; discoloration; artificial tooth; tea; alkaline peroxide Abstrak: Diskolorasi anasir gigi tiruan resin akrilik dapat menyebabkan masalah estetik. Alkalin peroksida merupakan pembersih gigi tiruan yang umum digunakan dengan beberapa efek samping sehingga diperlukan bahan alternatif seperti buah stroberi (Fragaria x ananassa) yang mengandung asam elagat (ellagic acid) dan asam malat (melic acid) yang dapat digunakan untuk memutihkan dan membersihkan gigi. Penelitian ini bertujuan untuk mengetahui pengaruh ekstrak stroberi konsentrasi 65%, 75%, 85%, dan 95% terhadap diskolorasi pada anasir gigi tiruan akibat perendaman teh. Jenis penelitian ialah eksperimental laboratoris dengan pre-test and post-test control group design. Anasir gigi tiruan berbahan resin akrilik diuji perubahan warna setelah direndam teh selama tujuh hari dan setelah direndam ekstrak stroberi dengan konsentrasi sebesar 65%, 75%, 85%, 95%, serta alkalin peroksida selama tujuh hari. Pengukuran warna dilakukan dengan menggunakan chromameter sistem CIE L*a*b*. Hasil uji paired t-test menunjukkan perbedaan bermakna (p<0,05) pada semua nilai ‘L’, ‘a’, dan ‘b’ kelompok sebelum dan sesudah perlakuan kecuali pada nilai ‘b’ perendaman dengan alkalin peroksida dan ekstrak dengan konsentrasi 75%. Hasil uji one way Anova menunjukkan hasil bermakna pada semua kelompok. Pembersihan noda teh terkuat hingga terlemah yaitu pada kelompok ekstrak stroberi 95%, ekstrak stroberi 85%, alkalin peroksida, ekstrak stroberi 75%, dan ekstrak stroberi 65% secara berturut. Simpulan penelitian ini ialah terdapat pengaruh ekstrak stroberi konsentrasi 65%, 75%, 85%, dan 95% terhadap kecerahan anasir gigi tiruan yang telah terdiskolorasi oleh teh. Perubahan kecerahan terbesar terjadi pada ekstrak stroberi konsentrasi 95%.Kata kunci: ekstrak stroberi; diskolorasi; anasir gigi tiruan; teh; alkalin peroksida

APA, Harvard, Vancouver, ISO, and other styles

7

Simamora, Bernadetta S. D., Brigitta N. R. Purnomo, Edward K. S. Limijadi, and Nadia Hardini. "Effect of Strawberry Extract (Fragaria x ananassa) towards Discoloration of Artificial Teeth due to Tea Immersion." e-GiGi 10, no. 2 (2022): 255–61. http://dx.doi.org/10.35790/eg.v10i2.44273.

Full text

Abstract:

Abstract: Discoloration of acrylic resin teeth can cause esthetic problem. Alkaline peroxide is commonly used as a denture cleanser, however, due to its side effects, an alternative material such as strawberry (Fragaria x ananassa) that contains ellagic acid and malic acid can be used to whiten and clean the teeth. This study was aimed to determine the effect of strawberry extract with concentrations of 65%, 75%, 85%, and 95% towards discoloration of artificial tooth due to tea immersion. This was an experimental laboratory study with a pre-test and post-test control group design. Artificial teeth made from acrylic resin were tested for color changes after immersion in tea for seven days followed by immersion in strawberry extract with concentrations of 65%, 75%, 85%, 95%, and alkaline peroxide for seven days. Color measurement was carried out using the chromameter and CIE L*a*b* system. Paired t-test showed a significant difference (p<0.05) in all values of 'L', 'a', and 'b' groups before and after treatment except for the value of 'b' immersion with alkaline peroxide and 75% strawberry extract. One way Anova test showed significant results in all groups. The strongest to the weakest tea stain cleanser was the group of 95% strawberry extract, 85% strawberry extract, alkaline peroxide, 75% strawberry extract, and 65% strawberry extract, respectively. In conclusion, strawberry extract at 65%, 75%, 85%, and 95% concen-tration affected the brightness of discolored artificial tooth due to tea immersion. The best change in brightness occurred at 95% concentration of strawberry extract.Keywords: strawberry extract; discoloration; artificial tooth; tea; alkaline peroxide Abstrak: Diskolorasi anasir gigi tiruan resin akrilik dapat menyebabkan masalah estetik. Alkalin peroksida merupakan pembersih gigi tiruan yang umum digunakan dengan beberapa efek samping sehingga diperlukan bahan alternatif seperti buah stroberi (Fragaria x ananassa) yang mengandung asam elagat (ellagic acid) dan asam malat (melic acid) yang dapat digunakan untuk memutihkan dan membersihkan gigi. Penelitian ini bertujuan untuk mengetahui pengaruh ekstrak stroberi konsentrasi 65%, 75%, 85%, dan 95% terhadap diskolorasi pada anasir gigi tiruan akibat perendaman teh. Jenis penelitian ialah eksperimental laboratoris dengan pre-test and post-test control group design. Anasir gigi tiruan berbahan resin akrilik diuji perubahan warna setelah direndam teh selama tujuh hari dan setelah direndam ekstrak stroberi dengan konsentrasi sebesar 65%, 75%, 85%, 95%, serta alkalin peroksida selama tujuh hari. Pengukuran warna dilakukan dengan menggunakan chromameter sistem CIE L*a*b*. Hasil uji paired t-test menunjukkan perbedaan bermakna (p<0,05) pada semua nilai ‘L’, ‘a’, dan ‘b’ kelompok sebelum dan sesudah perlakuan kecuali pada nilai ‘b’ perendaman dengan alkalin peroksida dan ekstrak dengan konsentrasi 75%. Hasil uji one way Anova menunjukkan hasil bermakna pada semua kelompok. Pembersihan noda teh terkuat hingga terlemah yaitu pada kelompok ekstrak stroberi 95%, ekstrak stroberi 85%, alkalin peroksida, ekstrak stroberi 75%, dan ekstrak stroberi 65% secara berturut. Simpulan penelitian ini ialah terdapat pengaruh ekstrak stroberi konsentrasi 65%, 75%, 85%, dan 95% terhadap kecerahan anasir gigi tiruan yang telah terdiskolorasi oleh teh. Perubahan kecerahan terbesar terjadi pada ekstrak stroberi konsentrasi 95%.Kata kunci: ekstrak stroberi; diskolorasi; anasir gigi tiruan; teh; alkalin peroksida

APA, Harvard, Vancouver, ISO, and other styles

8

Suci, Safira Maulida, and Eddy Dahar. "PENGARUH PERENDAMAN DALAM LARUTAN ALKALIN PEROKSIDA TERHADAP KEKERASAN PERMUKAAN SILIKON SOFT DENTURE LINER SWAPOLIMERISASI BERDASARKAN LAMA PEMAKAIAN." Cakradonya Dental Journal 15, no. 2 (2023): 137–43. http://dx.doi.org/10.24815/cdj.v15i2.27200.

Full text

Abstract:

Penggunaan soft denture liner pada gigi tiruan yang menyebabkan rasa sakit mengakibatkan bakteri dan jamur membentuk koloni secara mudah dan berpenetrasi pada gigi tiruan yang sudah diaplikasikan bahan SDL. Pembersihan kimiawi adalah pilihan utama untuk kontrol plak pada gigi tiruan yang sudah diaplikasikan SDL karena dapat membersihkan gigi tiruan yang tidak dapat dijangkau dengan metode mekanis. Alkalin peroksida adalah larutan pembersih yang efektif melarutkan kotoran dan mengurangi mikroorganisme terutama Candida albicans selama 15 menit perendaman. Penelitian ini bertujuan untuk mengetahui pengaruh perendaman dan perbedaan pengaruh lama perendaman silikon LTSDL swapolimerisasi dalam alkalin peroksida terhadap kekerasan permukaan selama 2 dan 4 hari. Rancangan penelitian ini adalah eksperimental laboratoris dengan bahan silikon LTSDL swapolimerisasi. Kekerasan permukaan diuji dengan alat Shore A Durometer. Berdasarkan hasil uji t Independen, diperoleh ada pengaruh perendaman silikon LTSDL swapolimerisasi dalam alkalin peroksida selama 2 dan 4 hari terhadap kekerasan permukaan. Kemudian hasil uji t Independen juga menunjukkan terdapat perbedaan kekerasan permukaan antara silikon LTSDL swapolimerisasi yang direndam dalam alkalin peroksida selama 2 dan 4 hari. Pada penelitian ini dapat disimpulkan bahwa silikon LTSDL swapolimerisasi yang direndam dalam bahan pembersih gigi tiruan alkalin peroksida dapat digunakan selama satu tahun pemakaian karena peningkatan kekerasan permukaan masih dalam rentang ISO.

APA, Harvard, Vancouver, ISO, and other styles

9

SKUPIEN, K., and J. OSZMIANSKI. "The effect of mineral fertilization on nutritive value and biological activity of chokeberry fruit." Agricultural and Food Science 16, no. 1 (2008): 46. http://dx.doi.org/10.2137/145960607781635822.

Full text

Abstract:

The aim of the study was to assess whether an extra fertilization with manganese, commercial fertilizer Alkalin (N, K and Si), and combined treatment (manganese + Alkalin) affect the chemical composition of chokeberry fruits (Aronia melanocarpa (Michx) Elliot), especially sugar content and the quantity and profile of phenolics. Dry weight, soluble solids, titratable acidity, total sugar, reducing sugar, sucrose, vitamin C, total polyphenol (gallic acid equivalents); 2, 2-diphenyl-1-picrylhydrazyl radical scavenging activity; and phenolics profile were measured from the fruits harvested from different treatments. Chokeberries treated with manganese showed high content of non-identified phenolic acids [101.15 mg per 100 g fresh weight (FW), these compounds were not detected in fruit treated with Alkalin and manganese + Alkalin], and the highest content of cyanidin glycosides (813.75 mg per 100 g FW). The fruits treated with Alkalin displayed the highest content of quercetin derivatives (40.88 mg per 100 g FW) and eriodictyol 7-glucuronide (26.43 mg per 100g FW). Chokeberries in control treatments had the highest content of dry weight (30.76% FW), soluble solids (24.1% FW), total sugar (20.92% FW), vitamin C (8.4 mg 100 g1 FW), total polyphenol (2377.1 mg gallic acid equivalents per 100 g FW), the highest 2, 2-diphenyl-1-picrylhydrazyl radical % inhibition (38.1%), highest content of chlorogenic acids (210.38 mg per 100 g FW), (-)epicatechin (32.18 mg per 100 g FW) and the highest degree of procyanidin polimerization (59). The results indicate that applied fertilization exerted differential influence on chemical composition of aronia fruits.;

APA, Harvard, Vancouver, ISO, and other styles

10

Usman, Ediar. "THE GEOCHEMICAL CHARACTERISTIC OF MAJOR ELEMENT OF GRANITOID OF NATUNA, SINGKEP, BANGKA AND SIBOLGA." BULLETIN OF THE MARINE GEOLOGY 30, no. 1 (2016): 45. http://dx.doi.org/10.32693/bomg.30.1.2015.74.

Full text

Abstract:

A study of geochemical characteristic of major elelemnt of granitoid in Western Indonesia Region was carried out at Natuna, Bangka, Singkep and Sibolga. The SiO2 contents of the granites are 71.16 to 73.02 wt%, 71.77 to 75.56wt% and 71.16 to 73.02wt% at Natuna, Bangka, and Singkep respectively, which are classified as acid magma. While in Sibolga the SiO2 content from 60.27 to 71.44wt%, which is classified as intermediate to acid magma. Based on Harker Diagram, the granites from Natuna, Bangka and Singkep as a co-genetic. In other hand the Sibolga Granite show as a scatter pattern. Granites of Natuna, Bangka and Singkep have the alkaline-total (Na2O + K2O) between 6.03 to 8.51 wt% which are classified as granite and alkali granite regime. K2O content ranges from 3.49 to 5.34 wt% and can be classified as calc-alkaline type. The content of alkaline-total of Sibolga granite between 8.12 to 11.81 wt% and classified as a regime of syenite and granite. The range of K2O is about 5.36 to 6.94wt%, and assumed derived from high-K magma to ultra-potassic types. Granites of Natuna, Bangka and Singkep derived from the plutonic rock types and calc-alkaline magma, while Sibolga granite magma derived from K-high to ultra-potassic as a granite of islands arc. Based on the chemical composition of granite in Western Indonesian Region can be divided into two groups, namely Sibolga granite group is representing the Sumatera Island influenced by tectonic arc system of Sumatera Island. Granites of Bangka and Singkep are representing a granite belt in Western Indonesian Region waters which is influenced by tectonic of back arc.Keywords: magma, geochemical characteristic, major element and Western Indonesian Region Kajian karakteristik geokimia dari unsur utama granitoid di Kawasan Barat Indonesia telah dilakukan di daerah Natuna, Bangka, Singkep dan Sibolga. Kandungan SiO2 granit Natuna antara 71,16 - 73,02%, Bangka antara 71,77 - 75,56%, Singkep antara 72,68 - 76,81% termasuk dalam magma asam. Granit Sibolga memiliki kandungan SiO2 antara 60,27 - 71,44% termasuk dalam magma menengah - asam. Berdasarkan Diagram Harker, granit Natuna, Bangka dan Singkep mempunyai asal kejadian yang sama (ko-genetik), sedangkan granit Sibolga membentuk pola pencar. Granit Natuna, Bangka dan Singkep mengandung total alkalin (K2O+Na2O) antara 6,03 - 8,51% termasuk dalam jenis rejim granit dan alkali granit. Berdasarkan kandungan K2O antara 3,49 - 5,34 %berat, bersifat kalk-alkali. Granit Sibolga mengandung total alkali antara 8,12 - 11,81% termasuk dalam rejim syenit dan granit, dan berdasarkan kandungan K2O antara 5,36 - 6,94% berasal dari jenis magma K-tinggi sampai ultra-potassik. Granit Natuna, Bangka dan Singkep berasal dari jenis batuan beku dalam dan magma kalk-alkalin yang berhubungan dengan penunjaman, sedangkan granit Sibolga berasal dari jenis magma K-tinggi - ultra-potassik sebagai granit busur kepulauan. Berdasarkan komposisi unsur kimia utama, granit di Kawasan Barat Indonesia dapat dibagi dalam dua, yaitu granit Sibolga yang mewakili P. Sumatera, dipengaruhi oleh sistem tektonik busur P. Sumatera. Granit Bangka dan Singkep dapat mewakili suatu jalur granit di perairan Kawasan Barat Indonesia yang dipengaruhi oleh tektonik busur belakang. Kata kunci: jenis magma, karakteristik geokimia, unsur utama, dan Kawasan Barat Indonesia

APA, Harvard, Vancouver, ISO, and other styles

More sources

Dissertations / Theses on the topic "Alkalin"

1

Jones, Sally Anne. "Alkali and alkaline earth metal fluoride mediated aromoatic halogen exchange reactions." Thesis, University of Liverpool, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.367085.

Full text

APA, Harvard, Vancouver, ISO, and other styles

2

Robinson, Alex Lockwood. "Sonoluminescence for the quantitative analysis of alkali and alkaline earth chlorides /." Thesis, Connect to this title online; UW restricted, 2001. http://hdl.handle.net/1773/8687.

Full text

APA, Harvard, Vancouver, ISO, and other styles

3

Hara, Hideaki. "Production of Quantum Degenerate Mixtures of Alkali and Alkaline-Earth-Like Atoms." 京都大学 (Kyoto University), 2014. http://hdl.handle.net/2433/185217.

Full text

APA, Harvard, Vancouver, ISO, and other styles

4

St-Amour, J. C. "The structural role of titanium in alkali and alkaline-earth bearing glasses." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1997. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp04/mq29254.pdf.

Full text

APA, Harvard, Vancouver, ISO, and other styles

5

Witherow, Rebecca A. "Minor Alkaline Earth Element and Alkali Metal Behavior in Closed-Basin Lakes." The Ohio State University, 2009. http://rave.ohiolink.edu/etdc/view?acc_num=osu1250628213.

Full text

APA, Harvard, Vancouver, ISO, and other styles

6

Wood, C. R. "Theoretical study of hydrogen storage in alkali- and alkaline-earth graphite intercalate compounds." Thesis, University College London (University of London), 2013. http://discovery.ucl.ac.uk/1399843/.

Full text

Abstract:

The research project described in the thesis uses atomic-scale computational modelling to investigate the storage of hydrogen in graphite intercalate compounds (GICs). The work is relevant to the energy economy, as hydrogen is a source of clean energy, and can be used efficiently in fuel cells to generate electricity. Storing hydrogen safely has long been a challenge in materials science and, since the proposal of a hydrogen-based transport economy, has attracted great attention. Graphite intercalate compounds offer the possibility of dense storage, because they contain large absorption pores for hydrogen to bind. The absorption mechanisms and patterns in different intercalate compounds are not well understood, and this is the motivation for this work. Alkali and alkaline-earth metal GICs (A/AE-GICs) were modelled using density func- tional theory (and benchmarked with quantum chemistry) to investigate their hydrogen storage capabilities and their stability against decomposition into the metal hydride and pure graphite upon hydrogenation. Detailed studies of the calcium-GIC were per- formed and also a survey of the other A/AE-GICs. The effect of the commonly modelled MC14 GIC compared with the experimental MC12 stoichiometry has been investigated to bridge the gap between experiment and theory. The calcium-GIC was found to favourably absorb hydrogen within U.S. Department of Energy targets, but was found to be extremely unstable. Our investigations showed that all AE-GICs are unstable. Heavier A-GICs were found to stably absorb hydrogen at reasonable volumetric densities at the cost of gravimetric densities. The theoreti- cally modelled MC14 stoichiometry was found to be fundamentally different from the experimental MC12 stoichiometry, with the latter breaking the simple symmetry of the former and offering many more distinct absorption sites and barriers to diffusion. Pair potentials have been built and parametrised to KC14 to aid simple modelling of KCn GICs in, for example, classical molecular dynamics.

APA, Harvard, Vancouver, ISO, and other styles

7

Davidson, Matthew Gwilym. "Alkali and alkaline earth metal complexes of multifunctional amines : syntheses, structures and uses." Thesis, University of Cambridge, 1994. https://www.repository.cam.ac.uk/handle/1810/272659.

Full text

APA, Harvard, Vancouver, ISO, and other styles

8

Chen, Chun-che. "Correlation between electrical and magnetic properties in alkali and alkaline earth metal doped lanthanum manganites /." Digital version accessible at:, 1999. http://wwwlib.umi.com/cr/utexas/main.

Full text

APA, Harvard, Vancouver, ISO, and other styles

9

Fukasawa, Kazuhito. "Systematic Study on the Thermodynamic Stability of Lanthanides and Actinides in Molten Alkali and Alkaline Earth Chlorides." 京都大学 (Kyoto University), 2012. http://hdl.handle.net/2433/157576.

Full text

APA, Harvard, Vancouver, ISO, and other styles

10

Potratz, Christopher M. "The Synthesis, Structure and Characterization of Extended Cobalt Ruthenium Carbonyl Compounds." The Ohio State University, 2010. http://rave.ohiolink.edu/etdc/view?acc_num=osu1275413923.

Full text

APA, Harvard, Vancouver, ISO, and other styles

More sources

Books on the topic "Alkalin"

1

Halka, Monica. Alkali and alkaline earth metals. Facts on File, 2010.

Find full text

APA, Harvard, Vancouver, ISO, and other styles

2

Brian, Nordstrom, ed. Alkali and alkaline earth metals. Facts on File, 2010.

Find full text

APA, Harvard, Vancouver, ISO, and other styles

3

Drit͡s, M. E. Splavy shchelochnykh i shchelochnozemelʹnykh metallov: Spravochnik. "Metallurgii͡a", 1986.

Find full text

APA, Harvard, Vancouver, ISO, and other styles

4

Menéndez Méndez, Esperanza, and António Santos Silva, eds. Total Alkalis in Concrete—Contribution to Alkali-silica Reaction. Springer Nature Switzerland, 2025. https://doi.org/10.1007/978-3-031-56164-1.

Full text

APA, Harvard, Vancouver, ISO, and other styles

5

W, Ohse Roland, and International Union of Pure and Applied Chemistry., eds. Handbook of thermodynamic and transport properties of alkali metals. Blackwell Scientific, 1985.

Find full text

APA, Harvard, Vancouver, ISO, and other styles

6

W, Ohse Roland, and International Union of Pure and Applied Chemistry., eds. Handbook of thermodynamic and transport properties of alkali metals. Blackwell Scientific, 1985.

Find full text

APA, Harvard, Vancouver, ISO, and other styles

7

Noble, E. G. Solubilities of chloride salts of alkali and alkaline-earth metals when sparged with hydrogen chloride. U.S. Dept. of the Interior, Bureau of Mines, 1985.

Find full text

APA, Harvard, Vancouver, ISO, and other styles

8

Baroody, Theodore A. Alkalize or die: Superior health through proper alkaline-acid balance. Eclectic, 1991.

Find full text

APA, Harvard, Vancouver, ISO, and other styles

9

W, Curry R., Royal Society of Chemistry (Great Britain), Society of Chemical Industry. Electrochemical Technology Group., and London International Chlorine Symposium (1994), eds. Modern chlor-alkali technology: Volume 6. Royal Society of Chemistry, 1995.

Find full text

APA, Harvard, Vancouver, ISO, and other styles

10

G, Walthall Frank, Philpotts John A, and Geological Survey (U.S.), eds. Abundances of Li, Rb, and Sr in W-2, BCR-1, and AC-E determined by isotope dilution mass spectroscopy. U.S. Dept. of the Interior, Geological Survey, 1993.

Find full text

APA, Harvard, Vancouver, ISO, and other styles

More sources

Book chapters on the topic "Alkalin"

1

Bährle-Rapp, Marina. "Alkalien (Sing. Alkali)." In Springer Lexikon Kosmetik und Körperpflege. Springer Berlin Heidelberg, 2007. http://dx.doi.org/10.1007/978-3-540-71095-0_320.

Full text

APA, Harvard, Vancouver, ISO, and other styles

2

Arevalo, Ricardo. "Alkali and Alkaline Earth Metals." In Encyclopedia of Earth Sciences Series. Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-39193-9_211-1.

Full text

APA, Harvard, Vancouver, ISO, and other styles

3

Arevalo, Ricardo. "Alkali and Alkaline Earth Metals." In Encyclopedia of Earth Sciences Series. Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-39312-4_211.

Full text

APA, Harvard, Vancouver, ISO, and other styles

4

Roundhill, D. Max. "Alkali and Alkaline Earth Metals." In Extraction of Metals from Soils and Waters. Springer US, 2001. http://dx.doi.org/10.1007/978-1-4757-5204-5_11.

Full text

APA, Harvard, Vancouver, ISO, and other styles

5

Yamada, Hiroshi, Mikio Wakasugi, Toshiyuki Kanda, Tomonori Seki, and Kazuo Ichimiya. "Basic Study on Ultra Rapid Hardening Alkali Activated Material Using Sodium Orthosilicate." In Springer Proceedings in Materials. Springer Nature Switzerland, 2024. http://dx.doi.org/10.1007/978-3-031-72955-3_53.

Full text

Abstract:

AbstractFor the purpose of developing a repair material that contributes to decarbonization, a basic study is conducted on an alkali activated material that does not require an alkaline solution. Thin study is characterized by the use of sodium orthosilicate as an alkaline source in order to achieve powder premixing, be ultra rapid hardening. Specifically, a basic study on ultra rapid hardening property and an improvement of the length change performance of the material using only ground granulated blast furnace slag were carried out. As a result, it was clarified that sufficient compressive strength at 3 h can be achieved by increasing the alkaline usage rate, and that the length change performance can be improved by using shrinkage reducing agents and expansive agents.

APA, Harvard, Vancouver, ISO, and other styles

6

Liang, Tao, Zicong Liu, Hexu Sun, and Jianxin Tan. "Multivariate Based Alkaline Electrolyzer Digital Twin Model Construction." In Proceedings of the 10th Hydrogen Technology Convention, Volume 1. Springer Nature Singapore, 2024. http://dx.doi.org/10.1007/978-981-99-8631-6_27.

Full text

Abstract:

AbstractElectrolytic water hydrogen production systems are highly coupled and operate under complex and dangerous conditions, making it difficult to carry out extreme experiments on physical objects. In this paper, the alkaline electrolyzer is studied and mathematical and three-dimensional models are developed for it. The System operation data shows that temperature, pressure and alkaline flow rate all have effects on the hydrogen concentration in oxygen and voltage. Among them, hydrogen concentration in oxygen is one of the important factors affecting the safety of the system, and changing both pressure and alkali flow rate respectively will cause significant changes in hydrogen concentration. Based on the system operation data, a multivariate nonlinear fitting of the empirical equation using Matlab was performed to establish the voltage model, Faraday efficiency model, hydrogen concentration in oxygen model and system pressure model of the alkaline electrolyzer. And the model simulation results were analyzed and verified theoretically, which were consistent with the actual engineering. The mathematical model of the alkaline electrolyzer is combined with the 3D model, and the digital twin model of the alkaline electrolyzer is controlled in real time by PLC. The mapping of the alkaline electrolyzer in the virtual space is realized, which provides an experimental platform for the subsequent study of wide power fluctuation.

APA, Harvard, Vancouver, ISO, and other styles

7

Akitt, J. W. "The Alkali and Alkaline Earth Metals." In Multinuclear NMR. Springer US, 1987. http://dx.doi.org/10.1007/978-1-4613-1783-8_7.

Full text

APA, Harvard, Vancouver, ISO, and other styles

8

Tapas, M. J., K. Vessalas, P. Thomas, N. Gowripalan, and V. Sirivivatnanon. "Composition of Alkali–Silica Reaction Products in Laboratory and Field Concrete." In Lecture Notes in Civil Engineering. Springer Nature Singapore, 2023. http://dx.doi.org/10.1007/978-981-99-3330-3_5.

Full text

Abstract:

AbstractThis study investigated the composition of alkali–silica reaction (ASR) products formed in mortar and concrete that underwent accelerated ASR testing using two test methods: the accelerated mortar bar test (AMBT) and the simulated pore solution immersion test (SPSM). The composition of the ASR products formed in the accelerated tests was compared with those in a 25-year old bridge in New South Wales demolished due to ASR. Results showed that the ASR products inside an aggregate contained calcium (≈20%), silicon (≈60%), and alkalis (≈20%) regardless of the ASR test method used. The ASR products in the AMBT sample only contained sodium, whereas the ASR products in the SPSM test and the demolished bridge both contained significant amounts of sodium and potassium, which indicated that the type of alkali in the ASR product is largely affected by the dominant alkali in the pore solution. However, considering that the total alkali content (Na + K) in the ASR products was similar regardless of the ASR test method used, this suggests that the total alkali content has more influence on the rate of expansion than the type of alkali. The composition of the ASR products also notably varied depending on the location in the concrete. ASR products closer to the cement paste had a higher calcium and lower alkali content than those inside an aggregate, which suggests that the calcium as well as the alkali content of the ASR products plays a significant role in the degree of ASR expansion.

APA, Harvard, Vancouver, ISO, and other styles

9

Browne, A. W., L. F. Audrieth, and E. Lannerud. "Potassium Azide (Alkali and Alkaline Earth Azides)." In Inorganic Syntheses. John Wiley & Sons, Inc., 2007. http://dx.doi.org/10.1002/9780470132326.ch27.

Full text

APA, Harvard, Vancouver, ISO, and other styles

10

Tyagi, Adish, Rohit Singh Chauhan, and A. K. Tyagi. "Biochemistry of Alkali and Alkaline Earth Metals." In Metal Ions in Biology. CRC Press, 2025. https://doi.org/10.1201/9781003432333-3.

Full text

APA, Harvard, Vancouver, ISO, and other styles

Conference papers on the topic "Alkalin"

1

Mcalister, Kelvin, and Edward Wolfe. "A Study of the Effects of Alkali Attack on Refractories Used in Incineration." In CORROSION 1993. NACE International, 1993. https://doi.org/10.5006/c1993-93207.

Full text

Abstract:

Abstract For optimal refractory service life, various factors must be assessed when refractories are used in incinerator applications. This paper explores high temperature chemical reactions between highly alkaline waste and assorted refractory composites. Alkali attack from destructive elements such as sodium and potash (salts) can often be the primary mode of lining wear. The results of laboratory evaluations are discussed. Insight is given as to recent discoveries on the changing mode of alkali attack in incinerators with highly alkaline waste.

APA, Harvard, Vancouver, ISO, and other styles

2

Kelley, DH, and MJ Thompson. "The Corrosion Resistance of Thermoset Composites in Alkaline Environments." In CORROSION 1998. NACE International, 1998. https://doi.org/10.5006/c1998-98457.

Full text

Abstract:

Abstract Corrosion engineers need guidelines for selecting thermoset resins for aggressive applications such as hot alkali and alkaline peroxide. The suitability of fiberglass-reinforced plastic (FRP) for alkaline service depends on factors such as the ester content of the resin, the unsaturated monomer composition, and the cure system. The purpose of the present paper is to show the effect of these factors on the alkaline corrosion resistance of FRP and provide corrosion engineers with the guidance needed for selecting the best epoxy vinyl ester resins for alkaline environments.

APA, Harvard, Vancouver, ISO, and other styles

3

Appleby, A. J. "Corrosion in Low and High Temperature Fuel Cells - an Overview." In CORROSION 1986. NACE International, 1986. https://doi.org/10.5006/c1986-86079.

Full text

Abstract:

Abstract Fuel cell anodes operate in a reducing atmosphere, whereas cathodes operate under strongly oxidizing conditions in difficult electrolytic environments. Electrochemical corrosion can limit the working cathode potential, hence fuel cell operating efficiency, as well as fuel cell lifetime. The four principal classes of electrolyte are aqueous alkali, aqueous acid, and two high-temperature CO2-rejecting systems: molten alkali carbonates (ca. 650°C) and solid oxide ionic conductors (1000°C). For the aqueous electrolytes, thermodynamically stable cathode materials include some of the noble metals and a range of passive oxides (restricted to Nb and Ta oxides in acid media). However, various kinetically stable carbons permit the possibility of inexpensive cathode construction materials and catalyst supports that are stable to 80°C and to over 200°C in alkaline and acid fuel cells repectively. The corrosion rates of these cathode components (and those of the supported platinum catalyst in acid media) ultimately limit fuel cell life and performance. In contrast, the high-temperature cells show few corrosion problems, provided that electronically conducting parts in contact with both anode and cathode atmospheres are protected by suitable dielectric coatings to prevent a direct ionic pathway between anodic and cathodic sites.

APA, Harvard, Vancouver, ISO, and other styles

4

Miravete, Antonio, Pablo Comino, Francisco Roman, Oscar Gracia, and Roberto Guzman de Villoria. "Corrosion Study of Fiberglass Rebars Embedded in Concrete: One Case Study." In CORROSION 2007. NACE International, 2007. https://doi.org/10.5006/c2007-07534.

Full text

Abstract:

Abstract It has been proved that steel rebars embedded in concrete are exposed to degradation with the time due to corrosion. Also, has been reported that polymer laminates suffer from glass-fiber related stress-corrosion cracking in alkaline environments. Nowadays, there are a number of glass fiber laminates commercially available but there are no sufficient data to assess the right material system in terms of technical and cost points of views. In this paper a set of tensile, bending and bonding test of alkali resistant (AR) glass and steel rebars will be carried out in order to characterize these material systems. Strength and modulus results will be reported. Finally, a case study related to aging of a concrete reinforced beam will be described. Aging results for glass and steel reinforced concrete will be shown.

APA, Harvard, Vancouver, ISO, and other styles

5

Junker, Andreas, Lars Vendelbo Nielsen, and Per Møller. "Effect of Chemical Environment and pH on AC Corrosion of Cathodically Protected Structures." In CORROSION 2017. NACE International, 2017. https://doi.org/10.5006/c2017-09352.

Full text

Abstract:

Abstract AC corrosion of structures under cathodic protection (CP) is a major concern for pipelines in case of even minor AC perturbations. There are indications that the specific chemical environment has a large influence on the AC mitigation current density criteria outlined in EN 15280:2013 [1]. This work investigates the effect of soil constituents, the earth alkali elements Ca and Mg, believed to have a large influence on the precipitation of hydroxides and carbonates in front of a coating damage. The formation of different polymorphous calcium carbonates, depending on the cathodic potential are observed as well as calcium hydroxides at high cathodic protection levels. This indicates a highly alkaline (pH &gt; 11) environment locally. Corrosion rates at different cathodic potentials are measured using electrical resistance (ER) probes and a chemical and phase analysis of the calcareous deposits and corrosion products is made using scanning electron microscopy and energy dispersive x-ray spectroscopy (SEM/EDS) and x-ray diffraction (XRD). The findings suggest an AC corrosion mechanism highly dependent on the build-up and break-down of calcareous deposits at high CP, which is clearly reflected in variations in the spread resistance.

APA, Harvard, Vancouver, ISO, and other styles

6

McCullough, John G., and Richard B. Nielsen. "Contamination and Purification of Alkaline Gas Treating Solutions." In CORROSION 1996. NACE International, 1996. https://doi.org/10.5006/c1996-96396.

Full text

Abstract:

Abstract Alkanolamine and potassium carbonate solutions in gas treating units removing carbon dioxide, hydrogen sulfide, or both are contaminated by impurities in the feed gases and makeup water and by the products of the degradation and oxidation of amines occurring in the units themselves. Feed gas impurities include oxygen, carbonyl sulfide, carbon monoxide, hydrogen cyanide, ammonia, brine, solid particles, heavy hydrocarbons, sulfur dioxide, hydrochloric acid, organic acids, and pipeline corrosion inhibitors. Impure makeup water contains sulfate, chloride, alkali metal, and alkaline earth ions (hardness). Reactions causing contamination in the units include oxidation of hydrogen sulfide to sulfate and thiosulfate, oxidation of amines to formic acid and other products, and degradation of amines by carbon dioxide. The resulting heat-stable salts and polymers reduce the gas absorbing capacity of alkanolamine solutions and increase their corrosiveness. Similar problems occur in potassium carbonate solutions, except that degradation products of amine activators are too dilute to be harmful. Contaminants are removed by inlet gas separation, charcoal and mechanical filtration, neutralization of heat-stable salts, reclaiming at both atmospheric and reduced pressure, upstream washing of the feed gas, electrodialysis, use of antioxidants, ion exchange, and blowdown and dumping of the solution.

APA, Harvard, Vancouver, ISO, and other styles

7

Wensley, Angela. "Corrosion in Alkaline Pulping Liquors." In CORROSION 2004. NACE International, 2004. https://doi.org/10.5006/c2004-04248.

Full text

Abstract:

Abstract Laboratory corrosion studies were carried out in green, white, and black liquors from a pulp and paper mill in the Northwestern US. The corrosion potential behavior and corrosion rates of carbon steel, stainless steel, and cast irons were determined at the service temperatures of the equipment from which the liquors were sampled, including storage tanks, evaporators, and concentrators. Both low-and high-silicon content carbon steels were found to be spontaneously active and had unacceptably high corrosion rates in the green liquor, white liquor, and strong black liquor. Carbon steels were spontaneously passive in the weak black liquor and also tended to passivate in the intermediate black liquor. Nickel-alloyed cast irons used for valves in the evaporators had corrosion behavior similar to or poorer than the carbon steels. Stainless steels such as type 304L austenitic stainless steel and type 2205 duplex stainless steel were found to have excellent resistance to corrosion in all the alkaline pulping liquors.

APA, Harvard, Vancouver, ISO, and other styles

8

Isa, Muhammad Nura, and Hanizam Awang. "Development of User Friendly Geopolymer Mortar Using Wood Ash Lye as Alkaline Activator." In 2024 10th International Conference on Architecture, Materials and Construction & 2024 5th International Conference on Building Science, Technology and Sustainability. Trans Tech Publications Ltd, 2025. https://doi.org/10.4028/p-me0x5u.

Full text

Abstract:

Geopolymer concrete is an environmentally friendly substitute for traditional Portland cement-based concrete. In contrast to conventional concrete, which contributes to substantial carbon dioxide emissions through Portland cement production, geopolymer concrete utilizes aluminosilicate materials like fly ash, slag, or metakaolin as binders. This innovative approach aims to reduce the environmental impact of construction materials by offering a more sustainable alternative to conventional cement-based concrete. Unfortunately, the technology of geopolymer concrete was mainly confined to laboratory research in developing countries due to the high cost of chemical activators used in its production. The current study explored the prospects of using wood ash (WA) lye as an alkaline activator in geopolymers. A single raw aluminosilicate material, class C palm oil fuel ash (POFA), was activated with WA lye and sodium silicate (Na₂SiO₃) to produce a geopolymer mortar. Both fresh and hardened properties tests were conducted to assess the WA lye-activated geopolymer mortar at 3, 7, 14, and 28 days. The optimum liquid/binder (L/B) ratio and alkali activator ratio (AAR) of WA lye-activated geopolymer mortar were 0.5 and 3.0, respectively. The outcome of this research indicate that WA lye can effectively be utilised to produce geopolymers with desirable properties, thereby providing an environmentally friendly and sustainable alternative to NaOH.

APA, Harvard, Vancouver, ISO, and other styles

9

Srinivas, G., B. Ramesh, Md Shareefuddin, M. N. Chary, and R. Sayanna. "Mixed alkali effect on the spectroscopic properties of alkali-alkaline earth oxide borate glasses." In INTERNATIONAL CONFERENCE ON CONDENSED MATTER AND APPLIED PHYSICS (ICC 2015): Proceeding of International Conference on Condensed Matter and Applied Physics. Author(s), 2016. http://dx.doi.org/10.1063/1.4946472.

Full text

APA, Harvard, Vancouver, ISO, and other styles

10

Liu Peng, Chen Jia-chuan, Yang Gui-hua, Tian Ye, and Yang Xiu-li. "Cold alkali pre-impregnated poplar Alkaline Peroxide Mechanical Pulping." In 2011 International Conference on Electric Technology and Civil Engineering (ICETCE). IEEE, 2011. http://dx.doi.org/10.1109/icetce.2011.5774529.

Full text

APA, Harvard, Vancouver, ISO, and other styles

Reports on the topic "Alkalin"

1

French, T. R., and C. B. Josephson. Surfactant-enhanced alkaline flooding with weak alkalis. Office of Scientific and Technical Information (OSTI), 1991. http://dx.doi.org/10.2172/6089128.

Full text

APA, Harvard, Vancouver, ISO, and other styles

2

Rose, M., and S. Thomas. Management of Alkali and Alkaline Earth Fission Products in Used Pyroprocessing Salt. Office of Scientific and Technical Information (OSTI), 2023. http://dx.doi.org/10.2172/2203088.

Full text

APA, Harvard, Vancouver, ISO, and other styles

3

Lorenz, P. B. Adverse effects of mineral-alkali reactions in alkaline flooding: A reappraisal, project BE4B, FY89. Office of Scientific and Technical Information (OSTI), 1989. http://dx.doi.org/10.2172/6204997.

Full text

APA, Harvard, Vancouver, ISO, and other styles

4

Chirachanchai, Suwabun. A Novel ion extraction material derived from silica surface modified silybenzoxazine derivatives via host-guest properties. Chulalongkorn University, 2001. https://doi.org/10.58837/chula.res.2001.81.

Full text

Abstract:

Silylbenzoxazine derivatives with different bulky group on benzene ring are synthesized employing aminosilane as a primary amine. The silylbenzoxazine derivatives with more bulky group exhibit low ion extraction percentage due to the difficulty of molecular assembly formation as a result of the bulky group repulsion combining with the long alkyl chain of silane. Silica surface modified benzoxazines are successfully achieved via silylbenzoxazine derivatives and show the ion extraction property for various alkali and alkaline earth metal ions. When silane is coupled onto silica, the benzoxazine shows different ion extraction ability from that of silylbenzoxazine. The silica surface modified silylbenzoxazines with bulky groups exhibit high ion extraction percentage which may be due to the loose packing structure of the molecular assembly inducing the high amount of cavity for guest.

APA, Harvard, Vancouver, ISO, and other styles

5

ศรีสถิตย์, ธเรศ. การสังเคราะห์ซีโอไลต์จากเถ้าลอยถ่านหินและจากเถ้าลอยชานอ้อย เพื่อการกำจัดตะกั่วในน้ำเสียอุตสาหกรรมจากโรงงานผลิตตะกั่วแท่ง : รายงานผลการวิจัย. จุฬาลงกรณ์มหาวิทยาลัย, 2006. https://doi.org/10.58837/chula.res.2006.55.

Full text

Abstract:

การวิจัยนี้มีวัตถุประสงค์เพื่อศึกษาความเป็นไปได้ในการสังเคราะห์ซีโอไลต์จากเถ้าลอยถ่านหินและเถ้าลอยชานอ้อยด้วยสารละลายด่างที่ผ่านการใช้แล้วจากโรงงานอุตสาหกรรมรมดำโลหะ (spent alkaline) เปรียบเทียบกับซีโอไลต์ที่กระตุ้นด้วยสารละลายโซเดียมไฮดรอกไซด์ โดยได้ทำการศึกษาสภาวะที่เหมาะสมในการสังเคราะห์ซีโอไลต์ โดยตรวจสอบความสามารถในการแลกเปลี่ยนแคลเซียมไอออนของซีโอไลต์ที่สังเคราะห์ได้ จากผลการทดลองพบว่าสภาวะที่เหมาะสมสำหรับการสังเคราะห์ซีโอไลต์จากเถ้าลอยถ่านหินและเถ้าลอยชานอ้อย คืออุณหภูมิในการทำปฏิกิริยา 90 องศาเซลเซียส ความเข้มข้นของสารละลาย spent alkaline 2 โมลาร์และระยะเวลาในการทำปฏิกิริยา 5 วัน ซึ่งให้ค่าความสามารถในการแลกเปลี่ยนแคลเซียมไอออนเท่ากับ 418.36 cmol/kg และ 286.29 cmol/kg ตามลำดับ การศึกษาครั้งนี้นำ ซีโอไลต์สังเคราะห์ไปทดสอบความสามารถในการกำจัดตะกั่วแบบไม่ต่อเนื่อง เพื่อศึกษาปัจจัยที่มีผลต่อการกำจัดตะกั่วในน้ำเสียสังเคราะห์ ได้แก่ พีเอช ความเข้มข้นของโลหะหนัก และปริมาณซีโอไลต์ เพื่อทดสอบไอโซเทอมการดูดติดผิวตะกั่ว พบว่า ที่พีเอช 5 และความเข้มข้น 10 มิลลิกรัมต่อลิตรมีเปอร์เซ็นต์การกำจัดตะกั่วดีที่สุด ซึ่งผลการทดลองไอโซเทอมการดูดติดผิวตะกั่วที่สภาวะดังกล่าว เป็นสมการดูดติดผิวแบบแลงมัวร์ ซึ่งพบว่าซีโอไลต์ที่สังเคราะห์จากเถ้าลอยถ่านหินและเถ้าลอยชานอ้อยที่กระตุ้นด้วยสารละลาย Spent alkaline มีค่าความสามารถในการดูดติดผิวตะกั่วสูงสุดเท่ากับ 78.31 และ 65.23 มิลลิกรัมต่อกรัมซีโอไลต์ ตามลำดับ ซีโอไลต์ที่สังเคราะห์จากเถ้าลอยถ่านหินและจากเถ้าลอยชานอ้อยที่กระตุ้นด้วยสารละลาย Spent alkaline มีความสามารถในการกำจัดตะกั่วในน้ำเสียจากโรงงานหลอมตะกั่วจากแบตเตอรี่เก่าได้เท่ากับร้อยละ 92.86 และ 89.56 ตามลำดับ ดังนั้นสารละลายด่างเก่า สามารถนำมาใช้ทดแทนสารละลายโซเดียมไฮดรอกไซด์ที่ใช้ในการเตรียมซีโอไลต์ได้

APA, Harvard, Vancouver, ISO, and other styles

6

Kim, Hojong, Supathorn Phongikaroon, and James L. Willit. Fundamental Electrochemical Properties of Liquid Metals in LiCl-KCl for Separation of Alkali/Alkaline-Earths (Cs, Sr, and Ba). Office of Scientific and Technical Information (OSTI), 2018. http://dx.doi.org/10.2172/1490212.

Full text

APA, Harvard, Vancouver, ISO, and other styles

7

Wang, K., G. S. Chottiner, P. Herrera-Fierro, and D. A. Scherson. Ex-situ and in-situ spectroscopic studies of the passive film on alkali and alkaline earth metals in nonaqueous solvents. Office of Scientific and Technical Information (OSTI), 1992. http://dx.doi.org/10.2172/7254901.

Full text

APA, Harvard, Vancouver, ISO, and other styles

8

หรรษาเวก, สิทธิศักดิ์. การพัฒนาวัสดุทดแทนกระดูกสำหรับการผ่าตัดกระดูก : รายงานการวิจัย. จุฬาลงกรณ์มหาวิทยาลัย, 2007. https://doi.org/10.58837/chula.res.2007.26.

Full text

Abstract:

คณะวิจัยได้ศึกษาผลของเนื้อกระดูก demineralized bone matrix (DBM) ในเซลล์โบรบลาสต์และการเปลี่ยนแปลงไปเป็นเซลล์กระดูก โดยศึกษาเปรียบเทียบกับเซลล์กลุ่มควบคุมซึ่งไม่ได้รับเนื้อกระดูก DBM พบว่า DBM ที่มีปริมาณแคลเซียเหลืออยู่ 2% มีระดับ alkaline phosphatase activity สูงที่สุด ลักษณะของเซลล์กลุ่มควบคุมซึ่งไม่ได้รับเนื้อกระดูก DBM ที่แยกเลี้ยงในจานทดลองเป็นเซลล์รูปกระสวยยาวเรียว เรียงตัวชิดกัน จากการศึกษาพบว่าเซลล์กลุ่มที่ได้รับเนื้อเยื่อกระดูก DBM มีการเจริญเพิ่มจำนวนของเซลล์น้อยกว่ากลุ่มควบคุมอย่างมีนัยสำคัญ เมื่อศึกษาถึงความสามารถในการเปลี่ยนแปลงไปเป็นเซลล์กระดูก เซลล์กลุ่มที่ได้เนื้อกระดูก DBM มีลักษณะกลมแบน ในขณะที่เซลล์กลุ่มควบคุมไม่มีการเปลี่ยนแปลงลักษณะของเซลล์แตกต่างไปจากเดิม หลังจากเลี้ยงไว้ในตู้อบเพาะเลี้ยงเซลล์เป็นเวลา 7 วัน ในการทดลองย้อมเซลล์ด้วย alkaline phosphatase เซลล์กลุ่มที่ได้รับเนื้อเยื่อกระดูก DBM ติดสีม่วงแดง นอกจากนี้เมื่อทำการย้อมด้วย Von Kossa และ osteocalcin ก็ให้ผลบวก ซึ่งยืนยันว่าเซลล์ไฟโบรบลาสต์มีการเปลี่ยนแปลงไปเป็นเซลล์กระดูก ในขณะที่เซลล์กลุ่มควบคุมไม่มีการเปลี่ยนแปลงดังกล่าว การศึกษานี้แสดงให้เห็นถึงเซลล์ไฟโบรบลาสต์ที่ได้รับเยื่อกระดูก DBM สามารถเปลี่ยนแปลงไปเป็นเซลล์กระดูกได้ ผลที่ได้จากการศึกษานี้เป็นแนวทางเลือกใหม่ที่สำคัญในการศึกษาพัฒนาวิธีการนำไปใช้ในการสร้างเนื้อเยื่อวิศวกรรมต่อไป

APA, Harvard, Vancouver, ISO, and other styles

9

Wang, K., G. S. Chottiner, P. Herrera-Fierro, and D. A. Scherson. Ex-situ and in-situ spectroscopic studies of the passive film on alkali and alkaline earth metals in nonaqueous solvents. Final report. Office of Scientific and Technical Information (OSTI), 1992. http://dx.doi.org/10.2172/10180284.

Full text

APA, Harvard, Vancouver, ISO, and other styles

10

Scherson, D., G. Chottiner, P. Herrara-Fierro, and Xuekun Xing. Spectroscopic studies of the passive film on alkali and alkaline earth metals in non-aqueous solvents: A surface science approach: Final report. Office of Scientific and Technical Information (OSTI), 1987. http://dx.doi.org/10.2172/5554162.

Full text

APA, Harvard, Vancouver, ISO, and other styles

We offer discounts on all premium plans for authors whose works are included in thematic literature selections. Contact us to get a unique promo code!