Stock Selection Model in the Formation of an Optimal and Adaptable Portfolio in the Indonesian Capital Market

SETIADI, Hendri,ACHSANI, Noer Azam,MANURUNG, Adler Haymans,IRAWAN, Tony Korea Distribution Science Association 2022 The Journal of Asian Finance, Economics and Busine Vol.9 No.9

This study aims to determine the factors that can influence investors in selecting stocks in the Indonesian capital market to establish an optimal portfolio, and find phenomena that occurred during the COVID-19 pandemic so that buying interest / the number of investors increased in the Indonesian capital market. This study collection technique uses primary data obtained from the survey questionnaire and secondary data which is market data, stock price movement data sourced from the Indonesia Stock Exchange, Indonesian Central Securities Depository, and Bank Indonesia, as well as empirical literature on behavior finance, investment decision, and interest in buying stock. The method used in this research is the survey questionnaire analysis with the SEM (statistical approach). The results of the analysis using SEM show that investor behavior influences the stock-buying interest, investor behavior, and the stock-buying interest influences investor decision-making. However, risk management does not influence investor-decision making. This occurs when the investigator's psychological capacity produces more decision information by decreasing all potential biases, allowing the best stock selection model to be selected. When the investigator's psychological capacity creates more decision information by reducing biases, the optimum stock selection model can be chosen.

GLOBAL EYE 국제표준화 칼럼 - 오늘의 투자-내일의 성공 -ISO의 개도국에 대한 표준 지원이 국제무역 촉진시켜

Setiadi, Bambang 기술표준원 2011 기술표준 Vol.114 No.-

Pedagogical Content Knowledge (PCK) and Teaching Performance of Indonesia’s Language Teachers at the Aftermath of Teacher Certification Program : A Case of Indonesia

Riswanda Setiadi,Bachrudin Musthafa APEC국제교육협력원 2013 Asia-Pacific Cybereducation Journal Vol.9 No.2

This study aims to describe the pedagogical content knowledge (PCK) and teaching performance of junior secondary language teachers based on the tests administered during the teacher certification program, and identify the correlation between both variables. It involved 124 junior secondary school teachers, consisting of 70 Indonesian language teachers and 54 English language teachers, from various schools in West Java Province, Indonesia. To organize research procedures, this study adopted a descriptive method used to describe the characteristics of teachers who participated in the teacher participation program, their current pedagogical content knowledge and teaching performance based on the test results. Findings show that PCK has a strong correlation with teaching performance. However, other factors such as employment status, academic qualification, and age have significant effects on the mastery of those two main variables. A further study should be conducted to gauge more sound findings.

Enhanced Lithium Storage Capacity of a Tetralithium 1,2,4,5-Benzenetetracarboxylate (Li₄C₁₀H₂O₈) Salt Through Crystal Structure Transformation

Cahyadi, Handi Setiadi,William, Wendy,Verma, Deepak,Kwak, Sang Kyu,Kim, Jaehoon American Chemical Society 2018 ACS APPLIED MATERIALS & INTERFACES Vol.10 No.20

<P>Because of their low price, design flexibility, and sustainability, organic-based electrode materials are considered one of the most promising next-generation alternatives to inorganic materials in Li-ion batteries. However, a clear understanding of the changes in the molecular crystal structure during Li-ion insertion/extraction and its relationship to excess capacity (over theoretical capacity) is still lacking. Herein, the tetralithium 1,2,4,5-benzenetetracarboxylate (Li<SUB>4</SUB>C<SUB>10</SUB>H<SUB>2</SUB>O<SUB>8</SUB>, Li<SUB>4</SUB>BTC) salt was prepared using a simple ion-exchange reaction at room temperature and under solvothermal conditions (100 °C). The solvothermally synthesized salt (Li<SUB>4</SUB>BTC-S) exhibited a well-ordered nanosheet morphology, whereas the room-temperature salt (Li<SUB>4</SUB>BTC-R) was comprised of irregularly shaped particles. During the cycling of Li<SUB>4</SUB>BTC-S, molecular rearrangement occurred to reduce the stress caused by repeated Li-ion insertion/extraction, resulting in a change in the crystal structure from triclinic to monoclinic and an increased free volume. This contributed to an increase in the reversible capacity to 1016 mAh g<SUP>-1</SUP> during the initial 25 cycles at 0.1 A g<SUP>-1</SUP>, and finally the capacity stabilized at ca. 600 mAh g<SUP>-1</SUP> after 100 cycles, which is much higher than its theoretical capacity (234 mAh g<SUP>-1</SUP>). Compared with Li<SUB>4</SUB>BTC-R, Li<SUB>4</SUB>BTC-S delivered a higher reversible capacity of 190 mAh g<SUP>-1</SUP> at a high current density of 2 A g<SUP>-1</SUP>, with an excellent long-term cyclability of up to 1000 cycles, which was attributed to the straight free volume columns and the low-charge-transfer limitation.</P> [FIG OMISSION]</BR>

Uniform and ultrathin carbon-layer coated layered Na₂Ti₃O₇ and tunnel Na₂Ti₆O₁₃ hybrid with enhanced electrochemical performance for anodes in sodium ion batteries

Hwang, Jieun,Setiadi Cahyadi, Handi,Chang, Wonyoung,Kim, Jaehoon Elsevier 2019 The Journal of supercritical fluids Vol.148 No.-

<P><B>Abstract</B></P> <P>Ultrathin and uniform carbon layer-coated layered Na<SUB>2</SUB>Ti<SUB>3</SUB>O<SUB>7</SUB> and tunnel Na<SUB>2</SUB>Ti<SUB>6</SUB>O<SUB>13</SUB> hybrids were synthesized via a facile and fast method using supercritical methanol and subsequent carbon coating with liquid carbon dioxide as a coating solvent. The carbon content and relative composition of the layered Na<SUB>2</SUB>Ti<SUB>3</SUB>O<SUB>7</SUB> and tunnel Na<SUB>2</SUB>Ti<SUB>6</SUB>O<SUB>13</SUB> phases in the hybrids were controlled by adjusting the calcination temperature. The drawbacks of each material could be overcome in the hybrid by taking advantage of the low volume expansion and high electronic conductivity (Na<SUB>2</SUB>Ti<SUB>6</SUB>O<SUB>13</SUB>), the high capacity (Na<SUB>2</SUB>Ti<SUB>3</SUB>O<SUB>7</SUB>), and a carbon coating. A careful examination of the cyclic voltammetry profiles of the sodium titanate hybrids revealed the existence of two different Na<SUP>+</SUP> ion diffusion pathways in the layered Na<SUB>2</SUB>Ti<SUB>3</SUB>O<SUB>7</SUB> phase. Under high discharge-charge conditions, some of the Na<SUP>+</SUP> ion uptake in the layered Na<SUB>2</SUB>Ti<SUB>3</SUB>O<SUB>7</SUB> and the structural integrity of tunnel Na<SUB>2</SUB>Ti<SUB>6</SUB>O<SUB>13</SUB> resulted in excellent high-rate performance and long-term cyclability in the hybrid.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Layered Na<SUB>2</SUB>Ti<SUB>3</SUB>O<SUB>7</SUB>/tunnel Na<SUB>2</SUB>Ti<SUB>6</SUB>O<SUB>13</SUB> hybrid was synthesized in supercritical methanol. </LI> <LI> Ultrathin and uniform carbon layer coated on the hybrid using liquid CO<SUB>2</SUB>. </LI> <LI> Layered/tunnel sodium titanate hybrids overcame drawbacks of each material. </LI> <LI> Kinetic and thermodynamic Na<SUP>+</SUP> ion uptake sites in the hybrid were verified. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>

One-pot synthesis of molybdenum disulfide–reduced graphene oxide (MoS₂-RGO) composites and their high electrochemical performance as an anode in lithium ion batteries

Choi, Mugyeom,Hwang, Jieun,Setiadi, Handi,Chang, Wonyoung,Kim, Jaehoon Elsevier science 2017 The Journal of supercritical fluids Vol.127 No.-

<P><B>Abstract</B></P> <P>A simple, effective, and ultra-fast one-pot route is developed to synthesize molybdenum disulfide (MoS<SUB>2</SUB>)-reduced graphene oxide (RGO) composites. The method to tightly anchor MoS<SUB>2</SUB> particles on the surface of RGO includes simultaneous reduction of graphene oxide (GO) and heterogeneous nucleation and growth of MoS<SUB>2</SUB> on the RGO surface in supercritical ethanol (scEtOH) medium. The synthesized MoS<SUB>2</SUB>-RGO composites have a mesoporous structure with high porosity. The MoS<SUB>2</SUB>-RGO composites show an enhanced electrochemical performance due to their unique nanostructure and the synergetic effect of MoS<SUB>2</SUB> and RGO nanosheets when compared to those of compared with bare MoS<SUB>2</SUB> and bare RGO. The MoS<SUB>2</SUB>-RGO composite with a MoS<SUB>2</SUB> loading of 74.0wt% can deliver a high reversible discharge capacity up to 1102mAhg<SUP>−1</SUP> at a rate of 0.05Ag<SUP>−1</SUP> after 80 cycles and an excellent cycling stability of 951mAhg<SUP>−1</SUP> at 0.05Ag<SUP>−1</SUP> after 140 cycles.</P> <P><B>Highlights</B></P> <P> <UL> <LI> One-pot, fast, green supercritical ethanol route to synthesize MoS<SUB>2</SUB>-RGO composites. </LI> <LI> MoS<SUB>2</SUB> is tightly anchored and uniformly deposited on the RGO surface. </LI> <LI> MoS<SUB>2</SUB>-RGO exhibits mesoporous structure with high porosity and conductivity. </LI> <LI> MoS<SUB>2</SUB>-RGO exhibits high reversible capacity of 1102mAg<SUP>−1</SUP> at 50mAg<SUP>−1</SUP>. </LI> <LI> Excellent high-rate performance of 469mAhg<SUP>−1</SUP> at 2.5Ag<SUP>−1</SUP> resulted. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>

The Potential of Legume Trees for Phytostabilization of Mercury Polluted Soils

Hanna Artuti Ekamawanti,Yadi Setiadi,Didy Sopandie,Dwi Andreas Santosa,Rocio Millan,Luis E. Hernandez 한국토양비료학회 2014 한국토양비료학회 학술발표회 초록집 Vol.2014 No.6

One-pot di- and polysaccharides conversion to highly selective 2,5-dimethylfuran over Cu-Pd/Amino-functionalized Zr-based metal-organic framework (UiO-66(NH₂))@SGO tandem catalyst

Insyani, Rizki,Verma, Deepak,Cahyadi, Handi Setiadi,Kim, Seung Min,Kim, Seok Ki,Karanwal, Neha,Kim, Jaehoon Elsevier 2019 Applied Catalysis B Vol.243 No.-

<P><B>Abstract</B></P> <P>Tandem heterogenous catalysis of bimetallic Cu-Pd on UiO-66(NH<SUB>2</SUB>) that were incorporated into sulfonated graphene oxide (Cu-Pd/UiO-66(NH<SUB>2</SUB>)@SGO or Cu-Pd/US) was investigated for the one-pot, direct conversion of di- and polysaccharides into 2,5-dimethylfuran (2,5-DMF) without separation of reaction intermediates. In the absence of a homogeneous acidic catalyst, consecutive reactions of glycosidic bond cleavage, isomerization, dehydration, and hydrogenation/hydrogenolysis were preceded by the synergistic effect of a multifunctional Cu-Pd/US catalyst. The strength and ratio of Brønsted and Lewis acid sites by adjusting UiO-66(NH<SUB>2</SUB>) to SGO ratios resulted in high-yield 5-(hydroxymethyl)furfural (5-HMF) through sequential glycosidic bond cleavage, isomerization, and dehydration of sucrose. Unlike monometallic Cu and Pd, bimetallic Cu-Pd promoted consecutive COH hydrogenolysis and CO hydrogenation of reaction intermediates, producing 2,5-DMF with a high yield of 73.4% during the one-pot conversion of sucrose at 200 °C and 1 MPa H<SUB>2</SUB> for 3 h. When starch was converted over Cu-Pd/US, 2,5-DMF was formed with 53.6% yield. Direct cellulose conversion into 2,5-DMF with a yield of 29.8% was achieved in the presence of 0.01 M HCl and Cu-Pd/US. The presence of the amino functional group (-NH<SUB>2</SUB>) in the UiO-66 framework was beneficial for improving the feed conversion and maintaining catalyst recyclability up to five times with almost no activity loss.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Cascade reactions from di- and polysaccharides to 2,5-DMF over CuPd/UiO-66(NH<SUB>2</SUB>)@SGO. </LI> <LI> Control of Brønsted and Lewis acid sites by adjusting UiO-66(NH<SUB>2</SUB>) to SGO ratio. </LI> <LI> Cu-Pd selectively promoted COH hydrogenolysis and CO hydrogenation of 5-HMF. </LI> <LI> One-pot sucrose conversion to 73.4% yield 2,5-DMF without intermediate purification. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>

Ga-doped Cu/H-nanozeolite-Y catalyst for selective hydrogenation and hydrodeoxygenation of lignin-derived chemicals

Verma, Deepak,Insyani, Rizki,Cahyadi, Handi Setiadi,Park, Jaeyong,Kim, Seung Min,Cho, Jae Min,Bae, Jong Wook,Kim, Jaehoon The Royal Society of Chemistry 2018 Green chemistry Vol.20 No.14

<P>The development of an efficient non-sulfided and non-precious catalyst for selective hydrogenation (HD) and hydrodeoxygenation (HDO) of biomass-derived feedstocks to produce fuels and chemicals is of great interest. In this study, a highly efficient bimetallic Ga-doped Cu/H-nanozeolite-Y (Cu/HNZY) catalyst was developed for selective HD and HDO of lignin-derived species (vanillin, acetovanillone, and cinnamaldehyde) under mild conditions (120-180 °C, 1 MPa H2). The HNZY support exhibited a mesoporous structure with a large external surface area, which can facilitate reactant adsorption. Ga doping not only increased the Cu dispersion and Lewis acidity, but produced low coordinated Ga species (<I>e.g.</I>, Ga<SUP>+</SUP> and (GaH2)<SUP>+</SUP>), which could enhance the HDO activity. As a result, at 160 °C for 2 to 5 h, complete conversion of vanillin and acetovanillone into their decarbonylated species (creosol and 4-ethylguiuacol) with high selectivity (@@>@@99%) could be achieved at a low H2 initial pressure of 1 MPa. In addition, when cinnamaldehyde was converted over Ga-doped Cu/HNZY at 180 °C, selective HD and HDO followed by cyclization formed high amounts of indane and its derivatives, which have a variety of applications in pharmaceutical and agricultural industries. This could open a new possibility for lignin-to-drug intermediates.</P>

Efficient oil recovery from highly stable toxic oily sludge using supercritical water

Khan, Muhammad Kashif,Cahyadi, Handi Setiadi,Kim, Sung-Min,Kim, Jaehoon Elsevier 2019 Fuel Vol.235 No.-

<P><B>Abstract</B></P> <P>One of the main challenges in crude oil extraction and refining is the formation of highly toxic intractable petroleum emulsions (oily sludge). Herein, the simultaneous demulsification and recovery of oil with low impurity content, trapped in petroleum emulsions, was investigated using supercritical water (scH<SUB>2</SUB>O). Various parameters, including temperature (350–400 °C), pressure (25–35 MPa), emulsion concentration (10–100 wt%), and reaction time (30–120 min) were explored to establish the optimized conditions. At 400 °C, the asphaltene content (23.7–3.4 wt%) and total acid number (15.4–2.8 mg-KOH/g-oil) decreased significantly, while the naphtha-to-diesel fraction increased from 9 to 21 wt%. These results indicated effective cracking of the toxic interfacially active species to form their non-toxic, non-interfacially active counterparts. By removing the interfacially active compounds that stabilize the petroleum emulsion, clear oil-water separation was achieved after conversion in scH<SUB>2</SUB>O, thereby facilitating the recovery of the upgraded oil. Additionally, heteroatoms and metallic impurities in the upgraded oil were significantly reduced [reduction efficiencies: 79% (V), 69% (Ni), 99% (Ca), 23% (S), 82% (N)]. Finally, plausible reaction mechanisms for the removal of interfacially active compounds were discussed using model compound reactions.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Complete demulsification of toxic oily sludge by non-catalytic supercritical water. </LI> <LI> Efficient oil recovery of 75–80 wt% with negligible coke and gas formation. </LI> <LI> Asphaltenes, nitrogen and residue reduction were 90, 82 and 68% respectively at 400 °C. </LI> <LI> Acidity and heavy metals were sufficiently reduced. </LI> <LI> Alkyl-CO<SUB>2</SUB> and Aryl-CO<SUB>2</SUB> bond scissions are major pathways for deacidification. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>