scholarly journals Geotechnical properties of yellow silty sand soil modified by bio-stimulation with presence of NiCl2

2021 ◽  
Vol 938 (1) ◽  
pp. 012001
Author(s):  
Jili Qu ◽  
Jinrui Cheng ◽  
Junfeng Wang
Keyword(s):  
Energy Dispersive Spectrometer ◽  
Silty Sand ◽  
Calcite Precipitation ◽  
Sand Soil ◽  
Environment Friendly ◽  
Two Factors ◽  
Stimulation Method ◽  
Cementing Material ◽  
Mass Test

Abstract Microbiologically induced calcite precipitation (MICP) is now widely tried to improve the quality of mostly sandy soil due to its application prospect to sustainability, environment-friendly and cost-efficiency. The present study is aiming to evaluate the feasibility of bio-stimulation, one of MICP techniques, for strengthening the engineering quality of Shanghai silty sand soil, a special type of soil located in low hillside of west Shanghai, as well as the influence of two factors: CaCl2 as a cementing material and NiCl2 as a co-factor, which was rarely researched before and can be viewed as the influence of urease activity on bio-stimulation result. The direct shear test, unconfined compressive test, supersonic wave test and calcite mass test have been carried out to evaluate engineering performance of yellow silty sand soil enhanced by bio-stimulation method as well as their relationship with concentration of CaCl2 and NiCl2 solutions. The result shows that bio-stimulation method can significantly promote the characteristics of Shanghai yellow silty sand soil and there seems to be extreme point for concentration of CaCl2 and NiCl2 solution in improving the quality of Shanghai yellow silty sand. Microstructure and composition of treated soil by bio-stimulation method have also been analyzed by Scanning Electron Microscope (SEM) and Energy dispersive Spectrometer (EDS), with giving the corresponding micro-mechanism of bio-cementation among soil particles.

scholarly journals Sand and silty-sand soil stabilization using bacterial enzyme–induced calcite precipitation (BEICP)

2019 ◽  
Vol 56 (6) ◽  
pp. 808-822 ◽  
Author(s):  
Tung Hoang ◽  
James Alleman ◽  
Bora Cetin ◽  
Kaoru Ikuma ◽  
Sun-Gyu Choi
Keyword(s):  
Soil Stabilization ◽  
Silty Sand ◽  
Bacterial Cells ◽  
Soil Permeability ◽  
Calcite Precipitation ◽  
Sand Soil ◽  
Bacterial Enzyme ◽  
Stabilized Soil ◽  
Soil Mixtures ◽  
Enzyme Application

This paper examines the bio-derived stabilization of sand-only or sand-plus-silt soils using an extracted bacterial enzyme application to achieve induced calcite precipitation (ICP). As compared to conventional microbial induced calcite precipitation (MICP) methods, which use intact bacterial cells, this strategy that uses free urease catalysts to secure bacterial enzyme–induced calcite precipitation (BEICP) appears to offer an improved means of bio-stabilizing silty-sand soils as compared to that of MICP processing. Several benefits may possibly be achieved with this BEICP approach, including bio-safety, environmental, and geotechnical improvements. Notably, the BEICP bio-stabilization results presented in this paper demonstrate (i) higher rates of catalytic urease activity, (ii) a wider range of application with sand-plus-silt soil applications bearing low-plasticity properties, and (iii) the ability to retain higher levels of soil permeability after BEICP processing. Comparative BEICP versus MICP results for sand-only systems are presented, along with BEICP-based results for stabilized soil mixtures at 90:10 and 80:20 percentile sand:silt ratios. This BEICP method’s ability to obtain unconfined compressive strength results in excess of 1000 kPa with sand-plus-silt soil mixtures is particularly noteworthy.

PENGARUH KONSENTRASI RAGI Saccharomyces cerevisiae DAN LAMA FERMENTASI TERHADAP KUALITAS CUKA TOMI-TOMI (Flacourtia inermis)

2015 ◽  
Vol 4 (2) ◽  
pp. 50-55
Author(s):  
Sandra J Nendissa ◽  
Rachel Breemer ◽  
Nikholaus Melamas
Keyword(s):  
Saccharomyces Cerevisiae ◽  
Experimental Design ◽  
Total Dissolved Solids ◽  
Total Sugar ◽  
Dissolved Solids ◽  
Randomized Experimental Design ◽  
Two Factors ◽  
Four Levels

This objectives of this research were both to study and determine the best level of concentration of yeast Saccharomyces cereviseae and period of fermentation on the quality of tomi-tomi vinegar (Flacourtia inermis). A completely randomized experimental design with two factors of treatment was applied in this research. The first factor was concentration of yeast S. cereviseae having four levels of tretament, i.e.: without the addition of yeast 0.5, 1 and 1.5 g yeast. The second factor was period fermentation with 1, 2, 3, 4, and 5 weeks. The result indicated that the concentration of yeast S. cereviseae 1.5 g and period fermentation 5 week produced a good tomi-tomi vinegar with total acids 51.22%, total dissolved solids 8.35, total sugar 8.07% and pH 5.40.

Quality of Life (QOL) of Balinese Women Working in Spa Tourism Industry

2015 ◽  
Vol 1 (1) ◽  
pp. 13
Author(s):  
Putu Sucita Yanthy ◽  
Luh Gede Leli Kusuma Dewi ◽  
W. Citra Juwitasari
Keyword(s):  
Quality Of Life ◽  
Tourism Industry ◽  
Family Needs ◽  
Interesting Phenomenon ◽  
Tourist Destinations ◽  
Foreign Countries ◽  
The Family ◽  
Two Factors ◽  
Material Factor

Bali is one of spa tourist destinations having various categories of spas and spa treatments, and the most important is the spa therapists. Spa development becomes an interesting phenomenon to be studied when it is associated with an involvement of Balinese women as spa therapists in foreign countries. The world’s demand for Balinese spa therapists has become the motivation of women to work in this area. The work and life of Balinese spa therapists while they are working in foreign countries serve as parameters to know their quality of life, and these parameters are also the main focus of this study. Through in-depth interviews and questionnaires distributed to 20 therapists it was found out that 85 percent of them have revealed an improvement in their quality of life that is influenced by two factors: the material and intimacy factors. The material factor in question refers to the economic improvement of the family as they could earn enough income to cover their family needs. The intimacy factor in question refers to closeness and a sense of solidarity fostered while they are working abroad and the relationship within the family. This study concludes that the most important part of the development of spa in Bali is its female Balinese spa therapists due to the image that Balinese women working as spa therapists are loyal, hard-working and honest making them in demand among tourists who are seeking spa treatments. Being a spa therapist can improve their quality of life, which means that subjectively both material and intimacy factors are the aspects that affect the quality of life of the Balinese spa therapists.

U.S.-Listed Foreign Companies' Choice of a U.S.-Based versus Home Country-Based Big N Principal Auditor and the Effect on Audit Fees and Earnings Quality

2015 ◽  
Vol 29 (3) ◽  
pp. 631-666 ◽  
Author(s):  
Sharad C. Asthana ◽  
K. K. Raman ◽  
Hongkang Xu
Keyword(s):  
Financial Reporting ◽  
Home Country ◽  
Earnings Quality ◽  
Audit Fees ◽  
Foreign Companies ◽  
Two Factors ◽  
Just Price ◽  
Reporting Environment ◽  
The U.S

SYNOPSIS We examine why U.S.-listed foreign companies choose to have a U.S.-based (rather than home country-based) Big N firm as their principal auditor for SEC reporting purposes and the effects of that choice for audit fees and earnings quality. We find that the likelihood of the Big N principal auditor being U.S.-based is decreasing in client size and the level of investor protection in the home country, and increasing in the proportion of income earned outside the home country. We also find compelling evidence that U.S.-based Big N auditors are associated with higher-quality earnings (albeit for a higher fee), despite two factors—the greater distance between the U.S.-based (vis-à-vis home country-based) Big N auditor and the client, and the likelihood that much of the audit work is done outside the U.S.—which potentially could lower the earnings quality of the U.S.-listed foreign client when the Big N principal auditor is U.S.-based. Overall, our study suggests that the higher fees associated with a U.S.-based Big N principal auditor is not just price protection; rather, U.S.-based Big N principal auditors are also improving the financial reporting environment by reporting higher-quality audited earnings for their U.S.-listed foreign clients. JEL Classifications: L11; L15; M42.

scholarly journals The Effect of Effective Microorganisms on the Quality of Potato Chips and French Fries

2021 ◽  
Vol 11 (4) ◽  
pp. 1415
Author(s):  
Barbara Sawicka ◽  
Piotr Pszczółkowski ◽  
Anna Kiełtyka-Dadasiewicz ◽  
Piotr Barbaś ◽  
Marek Ćwintal ◽  
...  
Keyword(s):  
Potato Chips ◽  
French Fries ◽  
Raw Material ◽  
Innovative Technology ◽  
Sensory Assessment ◽  
Effective Microorganisms ◽  
Beneficial Effects ◽  
Two Factors ◽  
Soxhlet Method

The aim of the work is to develop innovative technology for potato cultivation aimed at potato food processing with the use of effective microorganisms (EMs), limiting the chemicalization of agriculture. The basis for the research was a field experiment established by the randomized subblock method, in three repetitions, where two factors were examined: cultivation technologies (3) and potato varieties (14). The influence of experimental factors on the quality of French fries (FF) and potato chips (PC) was investigated. The water content was assessed by the drying method, and the fat content by the Soxhlet method. The sensory assessment was performed by a team of 10 panelists in accordance with EN ISO methodology. In the production of both FF and PC, cultivation technologies using EMs contributed to a significant reduction in the absorption of fats and a significant reduction in the disadvantages of FF, the so-called “dark ends”, and the sensory characteristics of these products have not deteriorated. Potato obtained from cultivation in the EM system is a better raw material for the production of FF and PC than potato from plantations without the use of effective microorganisms. The beneficial effects of these preparations depended on the exposure time to EMs and the potato variety.

scholarly journals Impact of Fear of Contracting COVID-19 and Complying with the Rules of Isolation on Nutritional Behaviors of Polish Adults

2021 ◽  
Vol 18 (4) ◽  
pp. 1631 ◽  
Author(s):  
Iwona Kowalczuk ◽  
Jerzy Gębski
Keyword(s):  
Eating Behaviors ◽  
Eating Habits ◽  
Food Product ◽  
Alcoholic Beverages ◽  
Online Study ◽  
Food Purchases ◽  
Product Consumption ◽  
Close Relationship ◽  
Two Factors

The aim of the study was to examine whether, and to what extent, fear of contracting Covid-19 and compliance with the mandatory rules of isolation affected Polish adults’ nutritional behaviors. The online study was carried out during the first wave of the pandemic on a sample of 926 adults. Through cluster analysis, three groups of respondents were isolated: 1. People who fear a Covid-19 infection and follow the isolation rules (FFR), 2. People moderately afraid of the disease and following the rules loosely (MFFR), 3. People who are not afraid of the infection and do not follow the rules of isolation. (NFFR). The clusters were profiled with consideration of different aspects of eating behaviors as well as socio-demographic and economic features. The results of the study show a close relationship between the level of fear of contracting Covid-19 and the degree to which isolation rules are followed. These two factors were found to have a significant impact on eating behaviors, such as food purchases, eating patterns, and levels of consumption. It was stated that the FFR group changed their eating behaviors the most in terms of food purchasing, eating habits (excluding diversity and quality of diet), and food product consumption. The greatest stability in the majority of the analyzed areas of nutritional behaviors was observed in the MFFR cluster. The NFFR group shown the greatest decrease both in regularity and quality of their meals. This group also exhibited a significant increase in the consumption of alcoholic beverages. The results of the study can be useful in the decision making process when introducing restrictions or managing information. They also point to the need for extensive nutritional education focused on explaining the relationship between nutrition and health during a pandemic.

Evaluation and Improvement of Productivity in High-Speed NC Machining

1999 ◽  
Vol 122 (3) ◽  
pp. 556-561 ◽  
Author(s):  
X. Yan ◽  
K. Shirase ◽  
M. Hirao ◽  
T. Yasui
Keyword(s):  
High Speed ◽  
Nc Machining ◽  
Cutting Conditions ◽  
High Speed Machining ◽  
Machining Time ◽  
Time Constants ◽  
Nc Program ◽  
Kinematic Factor ◽  
Two Factors

The productivity of machining centers is influenced inherently by the quality of NC programs. To evaluate productivity, first an effective feedrate factor and a productivity evaluation factor are proposed. It has been found that in high-speed machining, these two factors depend on a kinematic factor which is a function of (1) command feedrate, (2) average per-block travel of the tool, (3) moving vectorial variation of the tool, and (4) ac/deceleration or time constants. Then an NC program simulator has been developed to evaluate productivity. With the simulator, the machining time can be calculated accurately and the cutting conditions can be extracted. Finally, three NC programs were implemented on high-speed machining centers and analyzed by the simulator. It was found that in mold and die machining, the productivity can be improved by increasing the acceleration and average travel and reducing the vectorial variation of the tool rather than the command feedrate. [S1087-1357(00)01303-4]

Physical Quality of Turmeric Powder (Curcuma longga Linn) Result of Foam-mat Drying Method Using Microwave

2021 ◽  
pp. 57-65
Author(s):  
Dhinar Patliani ◽  
Dian Purbasari
Keyword(s):  
Grain Size ◽  
Moisture Content ◽  
Water Absorption ◽  
Bulk Density ◽  
Oil Absorption ◽  
Drying Method ◽  
Physical Quality ◽  
Average Grain Size ◽  
Two Factors

Turmeric (Curcuma longa L) in Indonesia is widely known as a herbal medicinal plant, food coloring, and food flavoring. The high water content of turmeric will shorten the storage time and the quality of the ingredients. The need for drying which is the process of removing the moisture content of the material with the aim of prolonging the shelf life. The use of the foam-mat drying method with the addition of adhesives aims to speed up the drying process and maintain the quality of a material. The result of drying turmeric obtained is turmeric powder product. This study used a completely randomized design (CRD) with two factors, namely the variation of the microwave oven power and the composition of the developer agent (ovalet). The research procedure was divided into two stages, namely the manufacture of powder and continued with the measurement of physical quality. The stages of making powder begin with the preparation of raw materials, stripping, size reduction, addition of developer, drying, then grinding. The second stage is measuring physical quality, namely fineness modulus, average grain size, powder moisture content, color, water absorption, oil absorption, and bulk density. The power variations used are 420 watts, 535 watts, and 680 watts, while the composition of the developer is 1%, 2%, and 4%. Data analysis using two-way ANOVA statistical test with two factors that affect the variation of power and composition of the developer (ovalet). FM values ​​ranged from 0.364 – 1.576, D values ​​ranged from 0.005 – 0.0012 mm, final moisture content values ​​ranged from 7.60 – 9.59%, powder moisture content values ​​ranged from 9.47 – 11.43%ww , L values ​​ranged from 61.46 – 65.96, a values ​​ranged from 13.54 – 16.05, b values ​​ranged from 48.21 – 52.42, DSA values ​​ranged from 2.78 – 3.54 ml/ g, DSM values ​​ranged from 1.22 – 1.60 ml/g, and DC values ​​ranged from 0.38 – 0.44 g/cm3. The combination treatment of drying power with developer is influenced by the drying power of the parameters, namely the value of moisture content, fineness modulus, average grain size, brightness level, redness level, yellowness level, oil absorption, water absorption, and bulk density. While the developer affects the finenes modulus, average grain size, yellowness level, and bulk density.

To Make a Choice You Should Know The Option Physiological and Psychological Contribution of the Female Component in National Security and Intelligence

2021 ◽  
Vol 2 (1) ◽  
pp. 36-51
Author(s):  
Sabrina Magris
Keyword(s):  
National Security ◽  
Intelligence Community ◽  
Left Behind ◽  
The World ◽  
Two Factors ◽  
Female Component ◽  
Near Future ◽  
Ways Of Being

The paper addresses the importance of the role of women in Intelligence and National Security with the specific purpose to highlight the quality of female contribution in all different domains. The world is changing and in this change, Intelligence risks being left behind as never before. An epic evolution and change are underway that will upset ways of being and ways of thinking. All this not suddenly and all this without realizing it if not after the fact. The world is changing, women “are gain the upper hand” taking over also numerically and it is not realized that a change must happen in the field of Intelligence with a space left to women, not because they are women but because of their abilities. In all domains, from strategic to an operational one. Blindness to change that many Agencies are having. And those who are making changes often do so because they are obliged by the rules but not by evaluating the concrete capability of individuals. Two factors risk being explosive if no action is taken. The paper highlights the physiological and psychological contribution of the female component in the National Security and Intelligence work, and why diversity is scientifically important to successfully conduct operational and strategic tasks. It also describes the existing lack of models, how to enlarge the interest of young girls to join the Intelligence Community, and a look into the near future regarding the training and the recruitment processes with specific regards to women.

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