scholarly journals LONG-TERM MEASUREMENTS OF EQUILIBRIUM EQUIVALENT RADON AND THORON PROGENY CONCENTRATIONS IN REPUBLIC OF SRPSKA DWELLINGS

2020 ◽  
Vol 11 (1) ◽  
Author(s):  
Zoran Ćurguz ◽  
Zdenka Stojanovska ◽  
Rosaline Mishra ◽  
Balvindar K. Sapra ◽  
Ilia V. Yarmoshenko ◽  
...  
Keyword(s):  
Indoor Environment ◽  
Geometric Mean ◽  
Construction Materials ◽  
Scientific Contribution ◽  
Calculated Ratio ◽  
One Year ◽  
Banja Luka ◽  
First Time ◽  
Thoron Progeny

The long–term measurements of radon and thoron equilibrium equivalent concentrations (EERC and EETC) were carried out the first time in Republic of Srpska in 25 schools of its capital Banja Luka and in its wider surroundings. After this successful survey, the measurements continued using the same type of the LR 115 nuclear track detectors, i.e., Direct Radon Progeny Sensors/Direct Thoron Progeny Sensors (DRPS/DTPS), and they were deployed in the 36 dwellings nearby the investigated schools. The detectors were exposed for one year period at 15–20 cm distance from the walls. The EERC and EETC were found to vary in the range from 6.3 to 14.4 Bq/m3and from 0.10 to 1.1 Bq/m3, with geometric mean 9.3 and 0.36, respectively. The same variance of EER and EET concentrations, measured in living and bedrooms of buildings built with different construction materials as well at different floors have been obtained. The insignificant correlations between EERC and EETC, show that these concentrations appeared to be independent in investigated dwellings. The calculated ratio of EETC to EERC ranged from 0.01 to 0.16 with the geometric mean of 0.04. The aim of this study is to give possible scientific contribution considering the explanation of EERC and EETC behavior in an indoor environment.

Utilization of Granite powder and Glass Powder in Reactive Powder Concrete: Assessment of Strength and Long Term Durability Properties

2021 ◽  
Author(s):  
Venkatesan B ◽  
Kannan V ◽  
Sophia M
Keyword(s):  
Electrical Resistivity ◽  
Glass Powder ◽  
Construction Materials ◽  
Reactive Powder Concrete ◽  
Waste Glass Powder ◽  
Chloride Migration ◽  
One Year ◽  
Granite Powder ◽  
Reactive Powder

This paper aims to assess the mechanical and long-term durability performance of Reactive Powder Concrete (RPC) containing Granite Powder (GrP) as cement replacement and waste Glass Powder (GP) as quartz sand replacement. The workability and mechanical behaviour of RPC containing various proportions of GrP and GP are assessed for different w/b ratios (0.3, 0.35, 0.4 and 0.45). The water resistance and tightness of RPC are measured by monitoring the electrical resistivity, water absorption, sorptivity and chloride migration over a one year period. Results reveal that substitution of GrP and GP at optimum levels of 15% and 30% respectively enhances the performance of RPC with the achievement of satisfiable workability at a 0.35 w/b ratio. A significant increase in the resistance towards chloride penetration and electrical resistivity was also observed with increasing ages. Thus, glass powder and granite powder can be considered as alternative construction materials providing economical and ecological efficiency.

scholarly journals Evaluating the Safety and Efficacy of a Highly Viscous 33-mg/mL Hyaluronic Acid Volumizing Filler in the Treatment of Facial Wrinkles: An Open-Labeled, Clinical Trials

2019 ◽  
Vol 8 ◽  
pp. e1148
Author(s):  
Elnaz Razavian ◽  
Setareh Tehrani
Keyword(s):  
Hyaluronic Acid ◽  
High Volume ◽  
Soft Tissue Augmentation ◽  
Nodule Formation ◽  
Safety And Efficacy ◽  
Significant Correction ◽  
Clinically Significant ◽  
One Year ◽  
First Time

Background: The 33-mg/mL hyaluronic acid (HA) formulation is a highly concentrated, cross-linked, cohesive, smooth, and completely reversible volumizing filler approved by Conformité Européene. For the first time, we aimed to evaluate the long-term efficacy and safety of the 33-mg/mL HA filler for soft tissue augmentation in the treatment of facial wrinkles. Materials and Methods: After optimal wrinkle correction was achieved in the patients undergoing treatment by injecting the 33-mg/mL HA filler at the injection site plus one touch-up at a 2-week interval, the safety and efficacy of the filler were assessed on the 5-point Facial Volume Loss Scale through the 1-year study period. Patients were evaluated daily for 14 days and after 6 and 12 months post-treatment. Results: A total of 86 subjects were treated. The mean wrinkle scores of the patients were 3.95+0.79 (range of 3-5) before treatment, 2.3+0.94 (range 1-5) six months after treatment, and 2.93+1.29 (range of 1-5) one year after treatment. Clinically significant mean wrinkle correction (P=0.001) was still evident at>12 months of treatment through 33-mg/mL HA formulation. A clinically significant correction at>12 months after treatment was maintained by 79% of patients. Nodule formation and swelling were more frequent when the 33-mg/mL HA filler was used compared with the use of less concentrated HA fillers. One patient developed angioedema-like swelling and induration last few months. Conclusion: The 33-mg/mL HA filler can provide long-term correction lasting for one year or more. Adverse effects, especially swelling and nodule formation were more common in this filler compared with less concentrated HA fillers. The side effects were correlated with the volume of the injected filler. We recommend using this concentration with low volume or combining high volume with lower concentration. [GMJ.2019;8:e1148]

The durability of sulfate resisting mortar with partial replacement by cement kiln dust

2014 ◽  
Vol 61 (3) ◽  
pp. 182-190
Author(s):  
Moayad M. Kassim
Keyword(s):  
Partial Replacement ◽  
Cement Kiln Dust ◽  
Cement Kiln ◽  
Saline Environment ◽  
Content Type ◽  
Environmental Requirements ◽  
One Year ◽  
First Time ◽  
Kiln Dust

Purpose – The purpose of this study was to reuse cement kiln dust (CKD) in cement products and report the results of determining the long-term compression and flexural tensile strengths of mortars containing CKD as a partial replacement of sulfate-resistant cement (SRC). During the manufacturing of Portland cement, voluminous quantities of the byproduct dust are produced, which is commonly known as CKD. In the past decade, according to environmental requirements, many researchers have attempted to reuse CKD in cement products. Design/methodology/approach – The long-term compression and flexural tensile strengths of mortars containing CKD as a partial replacement of SRC were tested. The replacement ratios in this study were 0, 5, 10, 15 and 20 per cent. The specimens were exposed to a highly saline environment after normal curing in water for a 28-day period. Findings – The results indicated a slight increase in the strength of CKD–SRC mortar containing 10 per cent CKD and moderate sulfate resistance when the CKD ratio reached 20 per cent, as compared to the reference mortar. In addition, CKD did not adversely affect the properties of SRC mortar subjected to sulfate exposure, even after one year. Originality/value – The tests were inducted for the first time on SRC, and the new results can be used to produce an environmental-friendly concrete.

scholarly journals Longer-Term Forecasting of Excess Stock Returns—The Five-Year Case

Mathematics ◽  
2020 ◽  
Vol 8 (6) ◽  
pp. 927
Author(s):  
Ioannis Kyriakou ◽  
Parastoo Mousavi ◽  
Jens Perch Nielsen ◽  
Michael Scholz
Keyword(s):  
Stock Returns ◽  
Geometric Mean ◽  
General Tendency ◽  
Investment Strategies ◽  
Excess Stock Returns ◽  
Long Term Forecasting ◽  
Economic Predictors ◽  
One Year ◽  
The One

Long-term return expectations or predictions play an important role in planning purposes and guidance of long-term investors. Five-year stock returns are less volatile around their geometric mean than returns of higher frequency, such as one-year returns. One would, therefore, expect models using the latter to better reduce the noise and beat the simple historical mean than models based on the former. However, this paper shows that the general tendency is surprisingly the opposite: long-term forecasts over five years have a similar or even better predictive power when compared to the one-year case. We consider a long list of economic predictors and benchmarks relevant for the long-term investor. Our predictive approach consists of adopting and implementing a fully nonparametric smoother with the covariates and the smoothing parameters chosen by cross-validation. We consistently find that long-term forecasting performs well and recommend drawing more attention to it when designing investment strategies for long-term investors. Furthermore, our preferred predictive model did stand the test of Covid-19 providing a relatively optimistic outlook in March 2020 when uncertainty was all around us with lockdown and facing an unknown new pandemic.

Salvage treatment of trigeminal neuralgia by occipital nerve stimulation

Cephalalgia ◽  
2013 ◽  
Vol 34 (4) ◽  
pp. 307-310 ◽  
Author(s):  
Denys Fontaine ◽  
Eric Bozzolo ◽  
Nathalie Chivoret ◽  
Philippe Paquis ◽  
Michel Lanteri-Minet
Keyword(s):  
Trigeminal Neuralgia ◽  
Nerve Stimulation ◽  
Single Case ◽  
Occipital Nerve Stimulation ◽  
Painful Condition ◽  
Occipital Nerve ◽  
Surgical Options ◽  
One Year ◽  
First Time

Background Although most patients suffering from trigeminal neuralgia (TN) respond to medical or surgical treatment, nonresponders remain in very severe painful condition. Case result We describe for the first time a case of severe refractory classical TN treated successfully (follow-up one year) by chronic bilateral occipital nerve stimulation (ONS), because other classic medical and surgical options failed or could not be performed. Conclusions This single case suggests that ONS might be offered to TN patients refractory both to standard drugs and interventions, with a favorable risk/benefit ratio, although its long-term efficacy remains unknown.

scholarly journals Изучение стабильности образцов гадолинизированного жидкого органического сцинтиллятора

2018 ◽  
Vol 44 (6) ◽  
pp. 59
Author(s):  
М.Б. Громов ◽  
Д.С. Кузнецов ◽  
А.Е. Мурченко ◽  
Г.Я. Новикова ◽  
Б.А. Обиняков ◽  
...  
Keyword(s):  
Stainless Steel ◽  
Light Yield ◽  
Target Material ◽  
Comparative Test ◽  
Sensitive Volume ◽  
Linear Alkylbenzene ◽  
One Year ◽  
Liquid Organic Scintillator ◽  
First Time

AbstractThe technology of preparing a linear-alkylbenzene-based gadolinium-doped liquid organic scintillator (Gd-LOS) as a target material in reactor antineutrino detectors has been developed. Results of longterm measurements of the light yield of Gd-LOS in contact with acryl and stainless steel are presented, which confirm the compatibility of Gd-LOS with these materials. The measurements were performed for two otherwise identical LOS detectors only differing in wall materials of the sensitive volume: acryl versus stainless steel. The results of measurements over about one year showed almost the same, relatively small decreases in the light yield of both detectors. It is concluded that both structural materials can be used in detector parts contacting with Gd-doped scintillator. Such a long-term parallel comparative test was carried out for the first time.

Evaluating the Safety and Efficacy of a Highly Viscous 33-mg/mL Hyaluronic Acid Volumizing Filler in the Treatment of Facial Wrinkles: An Open-Labeled, Clinical Trials

2019 ◽  
Vol 8 ◽  
pp. 1148
Author(s):  
Elnaz Razavian ◽  
Setareh Tehrani
Keyword(s):  
Hyaluronic Acid ◽  
High Volume ◽  
Soft Tissue Augmentation ◽  
Nodule Formation ◽  
Safety And Efficacy ◽  
Significant Correction ◽  
Clinically Significant ◽  
One Year ◽  
First Time

AbstractBackground: The 33-mg/mL hyaluronic acid (HA) formulation is a highly concentrated, cross-linked, cohesive, smooth, and completely reversible volumizing filler approved by Conformité Européene. For the first time, we aimed to evaluate the long-term efficacy and safety of the 33-mg/mL HA filler for soft tissue augmentation in the treatment of facial wrinkles.Materials and Methods: After optimal wrinkle correction was achieved in the patients undergoing treatment by injecting the 33-mg/mL HA filler at the injection site plus one touch-up at a 2-week interval, the safety and efficacy of the filler were assessed on the 5-point Facial Volume Loss Scale through the 1-year study period. Patients were evaluated daily for 14 days and after 6 and 12 months post-treatment.Result: A total of 86 subjects were treated. The mean wrinkle scores of the patients were 3.95+0.79 (range of 3-5) before treatment, 2.3+0.94 (range 1-5) six months after treatment, and 2.93+1.29 (range of 1-5) one year after treatment. Clinically significant mean wrinkle correction (P=0.001) was still evident at >12 months of treatment through 33-mg/mL HA formulation. A clinically significant correction at >12 months after treatment was maintained by 79% of patients. Nodule formation and swelling were more frequent when the 33-mg/mL HA filler was used compared with the use of less concentrated HA fillers. One patient developed angioedema-like swelling and induration last few months.Conclusion: The 33-mg/mL HA filler can provide long-term correction lasting for one year or more. Adverse effects, especially swelling and nodule formation were more common in this filler compared with less concentrated HA fillers. The side effects were correlated with the volume of the injected filler. We recommend using this concentration with low volume or combining high volume with lower concentration.[GMJ.2019;inpress:e1148]

Somatic Embryogenesis and In vitro Plant Regeneration in Vigna trilobata (L.) Verd. - A Potential Pasture Legume

1970 ◽  
Vol 19 (1) ◽  
pp. 89-99
Author(s):  
K. Choudhary ◽  
M. Singh ◽  
M. S. Rathore ◽  
N. S. Shekhawat
Keyword(s):  
Somatic Embryogenesis ◽  
Growth Regulators ◽  
Somatic Embryos ◽  
Basal Medium ◽  
Long Term Study ◽  
Continuous Application ◽  
First Time ◽  
Pasture Legume

This long term study demonstrates for the first time that it is possible to propagate embryogenic Vigna trilobata and to subsequently initiate the differentiation of embryos into complete plantlets. Initiation of callus was possible on 2,4-D. Somatic embryos differentiated on modified MS basal nutrient medium with 1.0 mg/l  of 2,4-D and 0.5 mg/l  of Kn. Sustained cell division resulted in globular and heart shape stages of somatic embryos. Transfer of embryos on to a fresh modified MS basal medium with 0.5 mg/l of Kn and 0.5 mg/l of GA3 helped them to attain maturation and germination. However, the propagation of cells, as well as the differentiation of embryos, were inhibited by a continuous application of these growth regulators. For this reason, a long period on medium lacking these growth regulators was necessary before the differentiation of embryos occurred again. The consequences for improving the propagation of embryogenic cultures in Vigna species are discussed. Key words: Pasture  legume, Vigna trilobata, Globular, Heart shape, somatic embryogenesis D.O.I. 10.3329/ptcb.v19i1.4990 Plant Tissue Cult. & Biotech. 19(1): 89-99, 2009 (June)

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