scholarly journals Evaluation of Two Kurdistan-Iraq Crude Oil (T-21A, PF2) by Derivatographic Method

2020 ◽  
pp. 38-46
Author(s):  
Sherwan Mohammad Simo ◽  
Salah Aldin Naman ◽  
Kanaan Ramadan Ahmed ◽  
Akhmetov Arslan Faritovich
Keyword(s):  
Crude Oil ◽  
Weight Change ◽  
Enthalpy Change ◽  
Heat Energy ◽  
Oil Well ◽  
Weight Changes ◽  
Enthalpy Changes ◽  
Thermogravimetric Curve ◽  
Methods Analytical ◽  
Physical And Chemical

Evaluation of crude oil and its residue using derivatography, is one of the most common physical and chemical methods analytical research. Crude oil residues 350+ obtain from two Iraq-Kurdistan crudes (Tawke T-21A well and Shekhan PF2 well) by using atmospheric distillation after removing all volatile fractions. The sample characterized by direvatographic method. The thermo analysis, reactions were carried out at temperature range 20- 700℃ for reaction time 68 min. These derivatograph curves show the weight change and heat energy (Enthalpy) change as the function of time and temperature. It shows that the crude oil residues have different composition. The curve which marks the weight changes of the sample heated is the thermogravimetric curve, TGA. Whereas the curve, which records heat energy or enthalpy changes during thermal decomposition is the DTA or differential thermoanalytic. By means of the derivatograph, it is possible to record simultaneously curve of weight change (TG), and enthalpy change (DTA) as a function of temperature. This method analysis shows good evaluation of these two crude oil well.

THE INFLUENCE OF WEIGHT AND HEIGHT ON WEIGHT CHANGES ASSOCIATED WITH PREGNANCY IN WOMEN

1957 ◽  
Vol 15 (4) ◽  
pp. 423-429 ◽  
Author(s):  
THOMAS McKEOWN ◽  
R. G. RECORD
Keyword(s):  
Weight Change ◽  
Weight Changes ◽  
Body Build ◽  
Weight Increment ◽  
Time Table ◽  
The Mean ◽  
Significant Change ◽  
First Time

SUMMARY Three hundred and eighty-three women whose weights were recorded during and after pregnancy were divided into groups of short (under 64 in.) and tall (64 in. and over) individuals, and further subdivided according to an index of body build (based on the observed regression of antenatal weight on height). Differences between the weight 12 months after delivery and the antenatal weight (adjusted according to the number of days by which it preceded or followed the 124th day of gestation) were examined. The proportion of short women who added weight in this interval was relatively high for those who were thinnest at the antenatal examination, was lowest for those who were moderately thin and thereafter increased with increasing degree of obesity (from about 1 in 3 to 4 in 5); the proportion of tall women who added weight showed no significant change (Fig. 2). This variation in weight change according to height is exhibited by women pregnant for the first time (Table 3). For both short and tall women, the mean weight increment of those who added weight, and the mean weight decrement of those who lost weight, increased with increasing degree of obesity (Fig. 3). When weight change is expressed as a proportion of the antenatal weight these trends disappear (Fig. 4).

scholarly journals Serum Levels of Fetal Antigen 1 in Extreme Nutritional States

2012 ◽  
Vol 2012 ◽  
pp. 1-6 ◽  
Author(s):  
Alin Andries ◽  
Andreas Niemeier ◽  
Rene K. Støving ◽  
Basem M. Abdallah ◽  
Anna-Maria Wolf ◽  
...  
Keyword(s):  
Weight Change ◽  
Serum Levels ◽  
Cross Sectional Study ◽  
Metabolic Adaptation ◽  
Weight Changes ◽  
Normal Range ◽  
Cross Sectional ◽  
Restrictive Surgery ◽  
Before And After ◽  
Fetal Antigen

Objective. Recent data suggest that fetal antigen (FA1) is linked to disorders of body weight. Thus, we measured FA1 serum levels in two extreme nutritional states of morbid obesity (MO) and anorexia nervosa (AN) and monitored its response to weight changes. Design. FA1 and insulin serum concentrations were assessed in a cross-sectional study design at defined time points after gastric restrictive surgery for 25 MO patients and 15 women with AN. Results. Absolute FA1 serum levels were within the assay normal range and were not different between the groups at baseline. However, the ratio of FA1/BMI was significantly higher in AN. FA1 was inversely correlated with BMI before and after weight change in AN, but not in MO patients. In addition, MO patients displayed a significant concomitant decrease of FA1 and insulin with the first 25% of EWL, while in AN patients a significant increase of FA1 was observed in association with weight gain. Conclusion. FA1 is a sensitive indicator of metabolic adaptation during weight change. While FA1 serum levels in humans generally do not correlate with BMI, our results suggest that changes in FA1 serum levels reflect changes in adipose tissue turnover.

Influence of Liquid Paraffins in Crude Oil on the Friction and Wear Behaviors of the Progressing Cavity Pump`s Stator Rubber

2013 ◽  
Vol 300-301 ◽  
pp. 833-836
Author(s):  
Shi Jie Wang ◽  
Hao Lin ◽  
Xiao Ren Lv
Keyword(s):  
Crude Oil ◽  
Friction And Wear ◽  
Wear Behavior ◽  
Liquid Paraffin ◽  
Testing Machine ◽  
Wear Testing ◽  
Wear Loss ◽  
Oil Well ◽  
Butadiene Rubber ◽  
Better Than

The progressing cavity pump (PCP) always works in the waxy oil well. Therefore the research on the influence of various liquid paraffin contents in crude oil on the friction and wear behaviors of the progressing cavity pump`s stator is very important for choosing the best stator rubber and developing the service life of PCP. Wear behavior of nitrile butadiene rubber (NBR) and fluororubber (FKM) was investigated at room temperature using a reciprocating friction and wear testing machine under the various paraffin contents in crude oil (0%、10%、30%、50%、100%). The wear morphology of blend was analyzed through the stereomicroscope and the wear behavior of two blends was also discussed and compared. The results show that the wear resistance of FKM is better than that of NBR under the same paraffin content in crude oil; With the increase of the paraffin content, the wear and coefficient of friction also increase. When the paraffin content in crude oil is less than 30%, the wear loss of NBR and FKM are basically the same; When the paraffin content in crude oil is more than 30%, the wear loss of NBR is far more than that of FKM.

Alaskan Transportation: An Overview of Some Aspects of Transporting Alaskan Crude Oil

1979 ◽  
Vol 16 (03) ◽  
pp. 211-224
Author(s):  
Stanley Factor ◽  
Sandra J. Grove
Keyword(s):  
Crude Oil ◽  
Gulf Coast ◽  
The United States ◽  
Oil Field ◽  
Oil Well ◽  
Paper Briefly ◽  
The North ◽  
Prudhoe Bay ◽  
Design Construction ◽  
Commercial Oil

The first commercial oil well in Alaska was drilled in 1901, but it was in 1968 that Alaska was thrust into prominence as an oil producer with the discovery of the Prudhoe Bay field, the largest oil field ever found in the United States. This paper briefly explores the transportation-related aspects of the design, construction, and operation of the pipeline and support facilities. The pipeline terminates at Port Valdez on Prince William Sound. It is from here that the second leg of the journey to the energy-hungry lower 48 states begins. A thoroughly modern and unique marine transportation system is being utilized to transport approximately 1.2 million barrels (191 000 m3) per day of Alaskan crude oil to West and Gulf Coast refineries. The Valdez Terminal, the pipeline, the North Slope supply, and vessel particulars and operations are discussed; in addition, environmental and legal problems are outlined.

Abstract P668: Clinically Meaningful Weight Gain Before Menopause and Risk of Stroke

Stroke ◽  
2021 ◽  
Vol 52 (Suppl_1) ◽  
Author(s):  
Maria D Zambrano Espinoza ◽  
Emma Kersey ◽  
Amelia K Boehme ◽  
Joshua Willey ◽  
Eliza C Miller
Keyword(s):  
Weight Gain ◽  
Weight Change ◽  
Stroke Risk ◽  
Cox Regression ◽  
Reference Group ◽  
Weight Changes ◽  
Younger Women ◽  
Hazard Ratios ◽  
History Of ◽  
Using Data

Background: Obesity is an independent risk factor for stroke. Weight gain has been associated with a higher risk of cardiovascular diseases in postmenopausal women. It is unclear, however, if weight changes before menopause have similar effects. We hypothesized that clinically meaningful premenopausal weight gain, defined as Body Mass Index (BMI) change >5%, would be associated with a higher stroke risk later in life. Methods: Using data from the California Teachers Study, we identified women aged < 55 with no history of stroke. We used weight changes between 1995-2006 as proxy for premenopausal weight gain. We defined weight change as modest or moderate using BMI changes of 5-10% and >10% respectively. Stroke outcomes were obtained from linkage to California hospitalization records. We used Cox regression models to calculate hazard ratios with 95% confidence intervals for the association of weight change and future stroke, adjusting for vascular risk factors. Results: Of 17,295 women included in the study, 113 had a stroke. In comparison to women who maintained a stable weight, women with moderate weight gain during premenopausal years had 2.0 times the risk of stroke. In the adjusted analysis, women with moderate weight gain had 89.6% higher risk of stroke, compared to the reference group. We found no significant association with stroke in women who had modest weight changes. Conclusion: Moderate premenopausal weight gain significantly increased stroke risk in women. Younger women should be educated about the effects of weight gain on future brain health. Count: 1836/1950

scholarly journals Study of Chemical and Morphological Transformations during Ni2Mo3N Synthesis via an Oxide Precursor Nitration Route

Catalysts ◽  
2018 ◽  
Vol 8 (10) ◽  
pp. 436
Author(s):  
Denis Leybo ◽  
Dmitry Arkhipov ◽  
Konstantin Firestein ◽  
Denis Kuznetsov
Keyword(s):  
Weight Changes ◽  
X Ray Diffraction ◽  
X Ray ◽  
Oxide Precursor ◽  
Nitride Formation ◽  
Extended Surface ◽  
Temperature Programmed ◽  
Morphological Transformations ◽  
Physical And Chemical ◽  
Oxide Sample

Chemical and morphological transformations during Ni2Mo3N synthesis were studied in this work. Nitride samples were synthesized from oxide precursors in H2/N2 flow and were analyzed by thermogravimetry, X-ray diffraction analysis, scanning electron microscopy, and energy dispersive X-ray spectroscopy methods. In addition, physical and chemical adsorption properties were studied using low-temperature N2 physisorption and NH3 temperature-programmed desorption. It was shown that nitride formation proceeds through a sequence of phase transformations: NiMoO4 + MoO3 → Ni + NiMo + MoO2 → Ni + NiMo + Mo2N → Ni2Mo3N. The weight changes that were calculated from the proposed reactions were in agreement with the experimental data from thermogravimetry. The morphology of the powder changed from platelets and spheres for the oxide sample, to aggregates of needle-like particles for the intermediate product, to porous particles with an extended surface area for the nitride final product. The obtained results should prove useful for subsequent Ni2Mo3N based catalysts production process optimization.

scholarly journals Short-term weight changes in community-dwelling older adults: the Health, Aging, and Body Composition Weight Change Substudy

2005 ◽  
Vol 82 (3) ◽  
pp. 644-650 ◽  
Author(s):  
Jung Sun Lee ◽  
Stephen B Kritchevsky ◽  
Tamara B Harris ◽  
Frances Tylavsky ◽  
Susan M Rubin ◽  
...  
Keyword(s):  
Older Adults ◽  
Body Composition ◽  
Weight Change ◽  
Community Dwelling ◽  
Weight Changes ◽  
Short Term ◽  
Health Aging ◽  
Community Dwelling Older Adults
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