1. Physico-mechanical Properties of Low-density GeopolymerMortarSynthesized Using Inexpensive Foam Agent. Issue 1 (November 2020) Authors: Amri, A; Reski, M; Helwani, Z; Aman, ; Hendri, Y B; Maizir, H; Saputro, S; Wahyuadi, J Journal: IOP conference series Issue: Volume 990:Issue 1(2020) Page Start: Record Type: Journal Article View Content: Available online (eLD content is only available in our Reading Rooms) ↗
2. The effect of KOH concentration and calcination temperature on the cement clinker catalyst activity in the transesterification of off-grade palm oil into biodiesel. Issue 1 (February 2021) Authors: Helwani, Z; Negara, W S; Zahrina, I; Amraini, S Z; Idroes, G M; Muslem, ; Idroes, R Journal: IOP conference series Issue: Volume 1087:Issue 1(2021) Page Start: Record Type: Journal Article View Content: Available online (eLD content is only available in our Reading Rooms) ↗
3. CaO from chicken eggshell supported on activated carbon and KOH (CaO/C/KOH) as catalyst for biodiesel production from off grade palm oil. Issue 1 (February 2021) Authors: Helwani, Z; Zahrina, I; Amraini, S Z; Sianturi, R I; Idroes, G M; Muslem, ; Idroes, R Journal: IOP conference series Issue: Volume 1087:Issue 1(2021) Page Start: Record Type: Journal Article View Content: Available online (eLD content is only available in our Reading Rooms) ↗
4. Method validation for pesticide multiresidue analysis of pyrethroid on green beans of arabica gayo coffee using gas chromatography-electron capture detector (GC-ECD). Issue 1 (February 2021) Authors: Yusuf, M; Idroes, R; Saiful, ; Lelifajri, ; Bakri, T K; Satria, M; Nufus, H; Yuswandi, I; Helwani, Z; Muslem, ; Marlina, Journal: IOP conference series Issue: Volume 667:Issue 1(2021) Page Start: Record Type: Journal Article View Content: Available online (eLD content is only available in our Reading Rooms) ↗
5. Extraction of polyunsaturated fatty acids to reduce the iodine number of biodiesel products. Issue 1 (April 2020) Authors: Helwani, Z; Umar, L; Neonufa, G F.; Puspawiningtyas, E; Prakoso, T; Lugito, G Journal: IOP conference series Issue: Volume 823:Issue 1(2020) Page Start: Record Type: Journal Article View Content: Available online (eLD content is only available in our Reading Rooms) ↗
6. Identification of Gayo arabic coffee beans and powder using the FTIR-PCA combination method. Issue 1 (February 2021) Authors: Akbar, Z; Idroes, R; Ginting, B; Karma, T; Rahimah, S; Helwani, Z; Yusuf, M Journal: IOP conference series Issue: Volume 1087:Issue 1(2021) Page Start: Record Type: Journal Article View Content: Available online (eLD content is only available in our Reading Rooms) ↗
7. Torrefaction of Empty Fruit Bunches: Evaluation of Fuel Characteristics Using Response Surface Methodology. Issue 1 (May 2020) Authors: Helwani, Z; Zulfansyah, ; Fatra, W; Fernando, A Q; Idroes, G M; Muslem, ; Idroes, R Journal: IOP conference series Issue: Volume 845:Issue 1(2020) Page Start: Record Type: Journal Article View Content: Available online (eLD content is only available in our Reading Rooms) ↗
8. The implementation of K-Means clustering in kovats retention index on gas chromatography. Issue 1 (February 2021) Authors: Noviandy, T R; Maulana, A; Sasmita, N R; Suhendra, R; Muslem, ; Idroes, G M; Paristiowati, M; Helwani, Z; Yandri, E; Rahimah, S; Muhammad, ; Irvanizam, ; Idroes, R Journal: IOP conference series Issue: Volume 1087:Issue 1(2021) Page Start: Record Type: Journal Article View Content: Available online (eLD content is only available in our Reading Rooms) ↗