scholarly journals Experimental study of base stabilization with fibrillated fiber

2020 ◽  
Vol 13 (6) ◽  
pp. 591-600
Author(s):  
Dar-Hao Chen ◽  
Younho Rew ◽  
Anand Bajarang Tapase ◽  
William Crockford
Keyword(s):  
Expansive Soils ◽  
Polypropylene Fiber ◽  
Synthetic Fiber ◽  
Army Corps ◽  
Percent Reduction ◽  
Us Army ◽  
Full Depth Reclamation ◽  
The North ◽  
Pavement Structures ◽  
And Control

AbstractPotential benefits in applying polypropylene fiber to stabilize expansive soils and cement treated bases is already been reported in previous studies. So a critical need exists to incorporate the use of fiber into the Texas Department of Transportation’s (TxDOT’s) Guidelines for Modification and Stabilization of Soils and Base for Use in Pavement Structures. The present paper discusses the results collected from the first experimental test section on FM897 in the TxDOT Paris District. Three 500-ft (152.4m) test sections were constructed with 2 percent cement on FM897 in February 2020 in the north bound lane loaded truck direction which includes a new sandstone base, full depth reclamation (FDR), and control. However, only the new sandstone base and FDR sections were built with fiber. In this project, two types of fibers were used —(a) fibrillated fiber Fibermesh300, and (b) macro-synthetic fiber Enduro 600. The surface and base layers from the new sandstone base section were removed and used for the edge widening area of the FDR and control sections. Based on the laboratory tests, the optimum fiber contents were found to be 0.6 percent and 0.4 percent for a new sandstone base and FDR, respectively. The laboratory Unconfine Compression Strength (UCS) results showed significant improvements (<112.36 percent) when fibers were added to the sandstone base. To have better control, fiber and cement were manually distributed, following the US Army Corps of Engineers’ recommendations. Becaus e of unexpected construction equipment failure that caused compaction delays of approximately 5 hours, cement was in contact with moisture for approximately 5 hours before compaction. UCS results showed an approximate 55 percent reduction when there was a 5-hour delay from the time water was introduced (resulting in the start of the hydration process) until the time of compaction. It indicated that there are detrimental effects on UCS if there is delay on compaction. There were significant reductions on the normalized W1 deflections at 5 months after construction. In particular, the FDR and new sandstone base sections (with fiber) experienced over 52 percent reduction as compared to 1 week after construction FWD data. Furthermore, the averaged W1 deflections were lower than before construction for both FDR and new sandstone base sections (with fiber). This indicates that there were rapid increases in structural capacity and significant strength developed in the fiber sections between 1 week and 5 months. Further research is needed to explain the mechanism and phenomena.

scholarly journals A Phase I Cultural Resource Survey for the Proposed Six Mile Boat Ramp Expansion Project (Texas Antiquities Permit #9155)

2020 ◽  
Author(s):  
Jay Gray ◽  
Jennifer Haney
Keyword(s):  
Potential Effect ◽  
Archaeological Sites ◽  
Army Corps ◽  
Short Report ◽  
Cultural Resource ◽  
Project Area ◽  
Us Army ◽  
The North ◽  
Administrative Code ◽  
Sabine River

Cultural Resource Analysts, Inc., personnel completed a records review and cultural resource survey for the proposed expansion of the existing Six Mile Boat Ramp in Sabine County, Texas. This work was performed to assist the Sabine River Authority of Texas in complying with Section 106 of the National Historic Preservation Act of 1966 (Public Law 89-665, 16 U.S.C. 470h-2) as an applicant for a Section 404 Clean Water Act Permit from the US Army Corps of Engineers, and the provisions of the Texas Administrative Code regarding archaeological resources on public lands. The Texas Administrative Code requires review of projects on state-owned lands by the Texas Antiquities Commission. The Sabine River Authority of Texas is considered a political subdivision of the State of Texas, and therefore it has a responsibility to provide the Texas Antiquities Commission an opportunity to review projects that may affect potential or designated archaeological sites. This project was performed under Texas Antiquities Permit (No. 9155). All work was performed pursuant to the guidelines published by the Council of Texas Archeologists and adopted by the Texas Historical Commission, and this report was prepared following the short report format in the Guidelines for Cultural Resource Management Reports published by the Council of Texas Archeologists. The current proposed project includes the expansion of the Six Mile Boat Ramp on the Toledo Bend Reservoir in Sabine County, Texas. The proposed development includes the addition of a handicap-accessible floating boat ramp, the clearing of approximately 0.4 ha (1.0 acre) of trees, the construction of a parking area, the addition of a vault toilet, the addition of two tables on concrete platforms, and the clearing of trees along the shoreline to provide an enhanced scenic view. In order to provide some flexibility in siting these facilities, the direct and visual areas of potential effect for this project were within a polygon adhering on its southern and western boundaries to the property line, and roughly buffered to the north and east by the existing shoreline of the Toledo Bend Reservoir. It is estimated that the area of potential effect for this project measures 1.2 ha (3.0 acres), of which approximately 0.9 ha (2.2 acres) could be surveyed, excluding paved surfaces. The records review for this project was conducted on October 18, 2019, prior to the commencement of the field survey, to identify cultural resources or cultural resource investigations previously documented within the area. This file search utilized online files maintained by the Texas Archaeological Research Laboratory at the University of Texas. Additionally, historic maps were examined to identify the locations of any potential historic archaeological sites. The records review indicated that one previously documented site, 41SB58, was located within approximately 50 m (164 ft) to the north of the proposed project area. Additionally, one historic structure was depicted within the project area on historic mapping. Fieldwork was conducted on November 19, 2019, and was completed in 11.5 person hours. The project area was systematically investigated by pedestrian survey and screened shovel tests spaced at a 30 m (98 ft) interval on pedestrian transects spaced at 30 m. The fieldwork for this project resulted in one newly recorded isolated find that is not eligible for designation as a Texas State Archeological Landmark or for listing in the National Register of Historic Places. Based on the findings of this work, it is recommended that the project area be considered cleared from a cultural resource perspective.

Efficacy of anthelmintic Eprimek against gastrointestinal nematodes in sheep

2020 ◽  
Vol 14 (4) ◽  
pp. 99-103
Author(s):  
V. I. Kolesnikov
Keyword(s):  
Live Weight ◽  
Gastrointestinal Nematodes ◽  
Production Environment ◽  
Control Groups ◽  
The North ◽  
Helminth Eggs ◽  
Nematode Eggs ◽  
Flotation Technique ◽  
And Control ◽  
Experimental Group

The purpose of the research is studying the efficacy of Eprimek (Eprinomectin) against gastrointestinal nematodes in sheep.Materials and methods. A commercial experiment to study the antiparasitic efficacy of Eprimek was carried out in June 2020 on 300 lambs of the North Caucasian breed in a private flock of Filimonovskaya Village, Izobilnensky District, the Stavropol Territory, which were divided into two groups. The experimental group of lambs (290 animals) was injected Eprimek subcutaneously at the earset at a dose of 1 ml/50 kg of live weight (10 mg of Eprinomectin in 1 ml), and 10 lambs were not treated; they were used as control. We collected feces from the lambs of the experimental and control groups before administration of the drugs and after 15 and 30 days. Fecal samples were examined by the flotation technique with a saturated solution of ammonium nitrate with counting nematode eggs in 1 g of feces. The results were processed statistically.Results and discussion. Eprimek showed a decrease in the number of excreted helminth eggs from 225.1±28.2 to 4.1±2.3 in production environment at a dose of 1 ml/50 kg of live weight, according to coprological studies on the 15th day after treatment in the experimental group of lambs. The efficacy was 98.2%, and 70% of the animals were free from the infection. The intensity of infection of the control lambs by gastrointestinal nematodes was 131–151 eggs per 1 g of feces at 100% prevalence.

The possible regulatory mechanisms of aqueous, ethyl acetate and nhexane fractions of the Ribes khorassanicum extract on acute hypertension in rats

2020 ◽  
Vol 20 ◽  
Author(s):  
Reza Mohebbati ◽  
Yasamin Kamkar-De ◽  
Mohammad Naser Shafei
Keyword(s):  
Ethyl Acetate ◽  
Antihypertensive Effect ◽  
Cardiovascular Responses ◽  
Regulatory Mechanisms ◽  
Hypertensive Rats ◽  
Control Groups ◽  
Acute Hypertension ◽  
The North ◽  
Significant Difference ◽  
And Control

Objective: Our previous studies showed the antihypertensive effect of Ribes khorassanicum (R. khorassanicum), a medicinal herb growing in the North Khorasan Province of Iran. For further evaluation, the present study investigated the effect of n-hexane (HX), ethyl acetate (EA), and aqueous (AQ) fractions of hydroalcoholic R. khorassanicum extract on cardiovascular responses in angiotensin II (AngII) and NG-nitro-L-arginine methyl ester (L-NAME) hypertensive rats. Methods: Wistar rats were randomly divided into 11 groups (n=5): 1) control, 2) AngII (50 ng/kg, i.v), 3) AngII + losartan (10 mg/kg, i.p), 4) L-NAME (10 mg/kg, i.v), 5) L-NAME+ sodium nitroprusside (SNP) (50 mg/kg, i.p), 6,7,8) one dose of each fraction of R. khorassanicum (AQ/EA/HX (50 mg/kg, i.p)) +AngII, and 9,10,11) one dose of each fraction of R. khorassanicum (AQ/EA/HX (50 mg/kg, i.p)) + L-NAME. Treated rats received three fractions 30 min before the injection of L-NAME and AngII in separate groups. The cardiovascular parameters were recorded by the Power Lab instrument via an angiocath inserted into the femoral artery. The peak changes (∆) of mean arterial pressure (MAP), systolic blood pressure (SBP), and heart rate (HR) in treated groups were compared with those of the hypertensive and control groups. Result: AngII and L-NAME significantly increased ∆MAP and ∆SBP and attenuated by pretreatment of LOS and SNP, respectively. Pretreatment with polar (AQ) and semipolar (EA) fractions of R. khorassanicum reduced the peak changes of MAP and SBP in both AngII and L-NAME-treated groups. Only the fraction of the herb attenuated the HR increased in the L-NAME group. The HR in other groups did not demonstrate any significant difference. Conclusion: All fractions of R. khorassanicum have an antihypertensive effect. However, the effect of polar fractions is more salient. It is also conceivable that the antihypertensive effect of fractions is mostly mediated by the inhibition of AngII.

scholarly journals Perfil Epidemiológico dos Isolamentos dos Microrganismos ‘Problema’

2019 ◽  
Vol 32 (9) ◽  
pp. 600
Author(s):  
Pedro Atilano Carvalho ◽  
Ana Monteiro ◽  
Bruno Almeida ◽  
Filomena Horta Correia ◽  
Vera Resende ◽  
...  
Keyword(s):  
Staphylococcus Aureus ◽  
Beta Lactamase ◽  
Drug Resistant ◽  
Streptococcus Pneumonia ◽  
Extended Spectrum Beta Lactamase ◽  
The North ◽  
Male Patients ◽  
Epidemiological Profile ◽  
Healthcare Associated ◽  
And Control

Introduction: Infections are a major problem and the presence of drug-resistant microorganisms has significant clinical and economic impact. The present study aims to evaluate the epidemiological profile of “problem” microorganisms isolated in a hospital in the north of Portugal.Material and Methods: All isolated microorganisms were analyzed, between January 2014 and June 2015. Data obtained was then processed using statistical software.Results: We analyzed 8146 microbiological isolations and found a prevalence of 23% of ‘problem’ microorganisms (in descending order of frequency: Enterococcus, Pseudomonas, Staphylococcus aureus e Streptococcus pneumonia), 57.55% of which isolated in male patients. The most frequent mechanism of drug resistance for the overall sample was the production of extended-spectrum beta-lactamase, and resistance to oxacillin for ‘problem’ microorganisms.Discussion: In this sample, we observed a much higher prevalence of ‘problem’ microorganisms than that reported in other countries, which shows the need of improvement of surveillance mechanisms and treatment of these cases. Microorganisms that showed higher resistance were Staphylococcus aureus (resistant to oxacillin) and Enterococcus (resistant to vancomycin). Those were isolated in patients with a higher mean age compared to non-resistant microorganisms. Most of these microorganisms were isolated in hospitalized patients or intermediate and intensive care units, what relates them with healthcare associated infections.Conclusion: The prevalence of infection by ‘problem’ microorganisms during the studied period was 23%. The detection and control of the spread of these microorganisms are paramount due to its impact on health costs, morbidity and survival of patients.

scholarly journals The Influence of Land Use Change and Spatial Discretization of Middle - Lower Ciliwung Sub-Watershed on Flood Hydrograph at Manggarai Weir : a Preliminary Study

2018 ◽  
Vol 7 (3.30) ◽  
pp. 497
Author(s):  
Nonik Eko Wahyuning Tiyas ◽  
Dwita Sutjiningsih
Keyword(s):  
Land Use ◽  
Land Use Change ◽  
Army Corps ◽  
Spatial Discretization ◽  
Rapid Urbanization ◽  
Us Army ◽  
Impervious Area ◽  
Strategic Value ◽  
Flood Hydrograph ◽  
Lowland Area

Jakarta is a lowland area with 40% of its territory at an elevation below the sea level so it is very vulnerable to flooding. One of out many causes floods in Jakarta is by the overflow of the Ciliwung River. The Ciliwung Watershed has a very strategic value in Indonesia because the Ciliwung River is one of thirteen rivers crossing the nation's capital. The rapid urbanization and population growth led to an increasing impervious area in the Ciliwung Watershed which resulted in a flood hydrograph change. This research aims to determine the influence of land use change, which is taking into account the spatial discretization and the riparian characteristic of Middle - Lower Ciliwung Sub-Watershed on flood hydrograph at Manggarai Weir. This research reviews the related literature on the implementation of HEC-GeoHMS version 10.1 developed by US Army Corps of Engineers (2013) to estimate the effect of land use change on flood hydrographs by taking into account the characteristics of the riparian described descriptively and present arguments to claim that the discretization spatial method can provide significantly more flood hydrographs results with existing conditions.  

scholarly journals To Mentor and Control: How the North Bennet Street Industrial School Became a Pioneer of Philanthropy and Americanization at the Turn of the Century

2021 ◽  
Vol 10 (1) ◽  
pp. 75-116
Author(s):  
Rosanna Wright
Keyword(s):  
Nineteenth Century ◽  
Turn Of The Century ◽  
Educational Institutions ◽  
The North ◽  
And Control ◽  
Industrial School

This study explores how Progressivism, and a belief in the benefits of ‘Americanizing’ immigrants, affected educational institutions such as Boston’s North Bennet Industrial School at the end of the nineteenth century.

scholarly journals A Preliminary Study on The Prevention and Control of Seawater Intrusion in Northern Pingtan Island with Freshwater Recharge Curtain

2020 ◽  
Vol 199 ◽  
pp. 00012
Author(s):  
Mengyao Diao ◽  
Panlin Li ◽  
Weifang Ruan ◽  
Wanglin Li
Keyword(s):  
Seawater Intrusion ◽  
Effective Means ◽  
Northern Coast ◽  
Economic Activities ◽  
Intrusion Prevention ◽  
The North ◽  
Pingtan Island ◽  
Preliminary Study ◽  
Over Exploitation ◽  
And Control

Seawater intrusion caused by groundwater over-exploitation is a kind of geological disaster caused by human economic activities and natural environment changes. Using freshwater recharge curtain technology is an effective means to prevent seawater intrusion. Based on the analysis of the characteristics of seawater intrusion in Pingtan island, Fujian Province, and in view of the possible seawater intrusion problems in the construction of Luyangpu underground reservoir in Pingtan Island, this paper expounds the basic principle of seawater intrusion prevention with freshwater recharge curtain , the technical measures of installing a row of recharge wells in the northern coastal zone of Luyangpu plain in Pingtan Island and using freshwater recharge curtain are put forward to prevent seawater intrusion. Through groundwater numerical simulation, the dynamic distribution of groundwater level in the north of Pingtan Island in the next 20 years is analyzed and predicted. The results show that the seawater intrusion can be effectively prevented by installing freshwater curtain recharge wells in the northern coast of Luyangpu.

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