摘要 :
NOVELTY STATEMENT This study provides information on the microbiome profile of soil and rhizosphere crude oil contaminated sites. The rhizosphere of growing plants in the crude-oil contaminated site exhibited a similar microbiome ...
展开
NOVELTY STATEMENT This study provides information on the microbiome profile of soil and rhizosphere crude oil contaminated sites. The rhizosphere of growing plants in the crude-oil contaminated site exhibited a similar microbiome profile as in soil, with a lower relative abundance of hydrocarbon-degrading genes. Commonly, most inhabitant plants of the contaminated site have great potential as a phytoremediator agent, however, two largely abundant species were found to possess low potential. Traditional oil mining poses negative effects on the environment through pollution with crude oil. One of the traditional mining sites in Wonocolo, Bojonegoro, Indonesia was reported to contaminate the surrounding area with a high level of crude oil. Therefore, this study aims to examine the microbiome profiles of contaminated soil and the rhizosphere of naturalized plants growing at the sites. It was conducted in Wonocolo, Bojonegoro to obtain an insight into the possible remediation efforts of using indigenous hydrocarbon-degrading bacteria and naturalized plants as in situ remediation agents. The results showed that the soil located close to the oil well-contained a high level of crude oil at 24.8%, and exhibited a distinct microbiome profile compared to those located further which had lower crude oil contamination of 14.15, 10.89, and 4.9%. Soil with the highest level of crude oil contamination had a comparatively higher relative abundance of assA, an anaerobic alkene-degrading gene. Meanwhile, the rhizosphere of the two naturalized plants, Muntingia calabura, and Pennisetum purpureum, exhibited indifferent microbiome profiles compared to the soil. They were found to contain less abundant hydrocarbon-degrading genes, such as C230, PAH-RHD-GP, nahAc, assA, and alkB suggesting that these naturalized plants might not be a suitable tool for in-situ remediation.
收起
摘要 :
The photoluminescence (PL) characteristics of ZnO/SiO2 composite particles were investigated. ZnO/SiO2 composite particles were synthesized utilizing the consecutive sol-gel spray drying method by incorpo-rating sodium lauryl sulf...
展开
The photoluminescence (PL) characteristics of ZnO/SiO2 composite particles were investigated. ZnO/SiO2 composite particles were synthesized utilizing the consecutive sol-gel spray drying method by incorpo-rating sodium lauryl sulfate (SLS) as a particle morphology control agent. The effect of SLS concentration and ZnO ratio on precursors was studied further on the composite particle morphology and PL perfor-mance. Elevating the SLS concentration exhibited a reduction in the particle diameter and an increase in particle uniformity. The particle diameter without SLS was 6.18 lm and reduced to 2.6 lm with the addition of SLS at 3 critical micelle concentrations (CMC). The decrease in ZnO concentration also reduced the particle diameter of the ZnO/SiO2 composite to 1.74 lm at a ZnO concentration of 25% mol. In addi-tion, the increase in the excitation wavelength from 230 nm to 320 nm indicates a shift in the peak emis-sion intensity at higher wavelengths from 467 nm to 645 nm. The excitation wavelength-dependent photoluminescence phenomenon was exhibited by incorporating silica into the ZnO precursor pre-and post-drying to deliver composite particles. The addition of silica to the composite particles can augment the PL emission intensity without causing a shift in the PL emission peaks when excited at the same wavelength. The 25% mol ZnO composite particles with the addition of SLS 3 CMC had the highest PL emission intensity. The amount of silica nanoparticles sufficient to trap the ZnO nanoparticles in the dro-plet is an important factor besides the size and uniformity of the particles, which causes the high inten-sity of PL emission. & COPY; 2023 The Society of Powder Technology Japan. Published by Elsevier BV and The Society of Powder Technology Japan. All rights reserved.
收起
摘要 :
Capsule shells have been successfully fabricated from water-soluble chitosan (WSC) with the addition of alginate and Gembili starch. WSC was synthesized from crab shell chitosan by depolymerization reaction. The capsule shells wer...
展开
Capsule shells have been successfully fabricated from water-soluble chitosan (WSC) with the addition of alginate and Gembili starch. WSC was synthesized from crab shell chitosan by depolymerization reaction. The capsule shells were made with the composition of WSC: Alginate, 2:1, 3:1 and 4:1 (w/w) with and without the addition of Gembili starch. Gembili starch was added with a ratio of Alginate: Starch, 1:1 (w/w). The capsule shell proper-ties were evaluated according to Indonesian Pharmacopoeia standard. The solubility test showed that the capsule shells were comply with the standard. The highest degrees of swelling in water and HCl 0.1 N solution were 491.93% and 410.51%, respectively. The highest degradation percentages in water and HCl 0.1 N solution were 57.80% and 21.44%, respectively. The observation of physical appearance indicated that the capsule shell with WSC: Alginate: Starch in ratio of 3:1:1 has appearance close to commercial capsule shell.
收起
摘要 :
This study was conducted to simulate a pin-type thin film solar cell by integrating nc-Si:H as p-window and buffer layers. The structures proposed to investigated are ITO/(p)nc-Si:H/((i)a-Si:H/(n)a-Si:H/Ag and ITO/(p)nc-Si:H/(p')n...
展开
This study was conducted to simulate a pin-type thin film solar cell by integrating nc-Si:H as p-window and buffer layers. The structures proposed to investigated are ITO/(p)nc-Si:H/((i)a-Si:H/(n)a-Si:H/Ag and ITO/(p)nc-Si:H/(p')nc-Si:H(buff)/(i)a-Si:H/(n)a-Si:H/Ag simulated with the AFORS-HET simulator. In an effort to improve the electrical and optical properties of the heterojunction solar cell, the dopant concentration for the p-window and n-layers, the absorber bandgap, and the absorber thickness were optimized. The result showed that the E-ff of p-p'-i-n is 9.60% (V-OC = 936.6 mV, J(SC) = 13.86 mA/cm(2), FF = 0.738) were obtained when values of Na, Nd, absorber bandgap, and absorber thickness parameters are 1.0 x 10(17) particles/cm(3), 1.0 x 10(19) particles/cm(3), 1.80 eV, and 600 nm, respectively.
收起
摘要 :
It is started from an evaluation of gas pipe protective building at oblique position accross the river bend with high discharge and dynamic flow contained trees, sand sediment, gravels up to boulder. The results of the failure ana...
展开
It is started from an evaluation of gas pipe protective building at oblique position accross the river bend with high discharge and dynamic flow contained trees, sand sediment, gravels up to boulder. The results of the failure analysis and evaluation on the previous building as follows: The structure is located on incorrect installation it is in oblique position exactly on the sharp curve of the river. The building is in such an alarming condition for the sub grade is eroded, saddle weight and anchor do not work properly due to erosion, upper flow and seepage flow. Gabions do not work properly they are tilted and lifted by the washed away by flood with its drift material. Due to the oblique position accross the river bend, an additional construction will be necessary. This gas pipe requires a protective building to return it to its former condition that is buried in two meters deep. Therefore, a check dam construction is required. Due to the oblique position accross the river bend, an additional construction will be necessary as crib that will direct the flow with such combination of cribs and check dam. The aim and goal of gas pipe protection can be achieved, accordingly. The results of gas pipe protective building evaluation are as follows: All components of the substitute building shall work simultaneously and they are quite reliable as proven by the good physical condition until the building construction is completed and once flood occured. After ones time flooding, the structure stability remains in good condition, does not break, does not slide, and does not roll. The sedimentation is seen at the upstream of the cribs during the construction of main building and afterwards. The main building works properly as required and it is proven by sedimentation that already occurs at the upstream of the check dam.
收起
摘要 :
The double row layout problem (DRLP) concerns on arranging a set of machines with various size on the two parallel rows with the aim to minimize the handling cost of material flow between machines. In some industrial applications,...
展开
The double row layout problem (DRLP) concerns on arranging a set of machines with various size on the two parallel rows with the aim to minimize the handling cost of material flow between machines. In some industrial applications, the layout planning requires the decision-makers to consider the safety factor, enforcing them to comply with a minimum distance between machines. Therefore, this study considers the inclusion of a safety factor in the DRLP, and a two-stage variable neighborhood search-sine cosine algorithm is proposed. In the first stage, the improved variable neighborhood search (IVNS) is developed for determining the placement of the machines in both rows. Then, in the second stage, a sine-cosine algorithm (SCA) is presented for adjusting the exact position of machines in the shorter row. The effectiveness and efficiency of the proposed algorithm are demonstrated by extensive computational test with various level of complexity.
收起
摘要 :
The performance of oil palm trunk wastes from Banjarbaru of South Kalimantan was improved with the help of chemical modification in a two-step treatment. The first was formalization with formaldehyde solution with varying pH, and ...
展开
The performance of oil palm trunk wastes from Banjarbaru of South Kalimantan was improved with the help of chemical modification in a two-step treatment. The first was formalization with formaldehyde solution with varying pH, and the second was impregnation with melamine-formaldehyde resin under 5 bar pressure for an hour. In these processes, the samples were cured at 120 degrees C for 10 min and then dried in an oven at (103 +/- 2)degrees C in order to attain a moisture content of less than 6%. These treatments improved the physical properties (density, moisture content, and volume swelling), mechanical resistance, dynamic-mechanical and acoustic performance of the woods. The combination of impregnation and formalization changed the structure and the morphology of the woods such that the surface became flatter and denser. This was confirmed by results from FTIR, SEM, and DMA. Samples with alkaline modification displayed the best results for dimensional stability, storage modulus, and damping factor in varied frequencies. The treatments in this study also heightened acoustic performances as evidenced by the resulting characteristics of sound absorption coefficient and acoustic impedance.
收起
摘要 :
A simple, highly reproducible, and environmentally friendly method is a considered approach in generating renewable energy materials. Here, hydrogenated amorphous carbon (a-C) films have been successfully prepared from palmyra liq...
展开
A simple, highly reproducible, and environmentally friendly method is a considered approach in generating renewable energy materials. Here, hydrogenated amorphous carbon (a-C) films have been successfully prepared from palmyra liquid sugar, employing spin-coating and spraying methods. Compared with the former method, the latter shows a significance in producing a better homogeneity in particle size and film thickness. The obtained films have a thickness of approximately 1000 to 100 nm and contain an sp(2) hexagonal structure (similar to 70%) and sp(3) tetrahedral configuration (similar to 30%) of carbons. The introduction of boron (B) and nitrogen (N) as dopants has created the local structural modification of bonding, inducing a slight change of electrical conductivity, electronic energy bandgap, and optical transparency near-infrared region. The obtained a-C film features a "green" semiconducting material.
收起
摘要 :
The adsorption simulation of acetic acid, methanol, and triacetin has been carried out on the ZnO and V-doped ZnO (V-ZnO) through computational study. The DFT/B3LYP method was applied using the Def2-TZVP basis set. The results sho...
展开
The adsorption simulation of acetic acid, methanol, and triacetin has been carried out on the ZnO and V-doped ZnO (V-ZnO) through computational study. The DFT/B3LYP method was applied using the Def2-TZVP basis set. The results show that the acetic acid adsorption on the ZnO surface was the most favorable among the others. The insertion of V atom into the ZnO surface causes the adsorption energy more negative. The NBO charge analysis was carried out to analyze the interaction between adsorbate molecules and the adsorbate. It was found that the charge transfer between acetic acid and the ZnO or V-ZnO surface has the highest value indicating that acetic acid adsorption plays an important role in the esterification reaction.
收起
摘要 :
Process model resulting from small event log datasets can be easily done because currently available applications are relatively able to do so. However, when faced with event logs from big data, modelling will force the existing a...
展开
Process model resulting from small event log datasets can be easily done because currently available applications are relatively able to do so. However, when faced with event logs from big data, modelling will force the existing applications to work hard. So far, the steps used are sampling of event logs resulting from the system. The problem arising is that the sampling process must be done several times because it has to check the desired fitness value on the sample taken. If the fitness value has not been got, then the sample size is added and the fitness value at a certain iteration is calculated until the required fitness value is met. There are many steps to do with this mechanism. Thus, this paper proposes an alternative way to reduce the steps by using an appropriate sampling technique. The mechanism used is statistical-based sampling simulation in the event log datasets to determine which sampling method is stable in the process modelling. The simulation results show that the sampling method using Cluster Random Sampling with the error rate or Alpha of 1 % has a relatively stable process model and can represent the process model resulting from the event log population. (Received in July 2022, accepted in November 2022. This paper was with the authors 3 weeks for 1 revision.)
收起
原文获取