research centers


Search results: Found 17

Listing 1 - 10 of 17 << page
of 2
>>
Sort by

Article
EFFECT OF A DRIVEN PILE ON AN EXISTING TUNNEL

Authors: Nahla Mohammed Salim --- Sherine Jafaar Lafta
Journal: Journal of Engineering and Sustainable Development مجلة الهندسة والتنمية المستدامة ISSN: 25200917 Year: 2020 Volume: 24 Issue: 1 Pages: 94-100
Publisher: Al-Mustansyriah University الجامعة المستنصرية

Loading...
Loading...
Abstract

It is essential to measure the response of existing tunnel-lining due to newly constructed pile to assess the safety against the additional forces/moment caused by pile driving and loading and to evaluate the critical distance for the proposed construction of any structures from the tunnel location. This study presents an experimental work to investigate the effects of driven pile during insertion and loading on existing tunnel embedded in the sandy soil. It is found that the effects of driving and loading of pile on stresses transfer to tunnel depend on the horizontal separation distance between pile’s tip and tunnel, and the stresses generated due to the loading of a pile is higher than the stresses during construction period furthermore the ultimate bearing capacity of pile increased due to the presence of tunnel.

Keywords

pile --- tunnel --- stress --- sand


Article
WORD STRESS IN IRAQI TURKMEN WITH REFERNCE TO ENGLISH
النبر في لغة تركمان العراق بالإشارة الى اللغة الانكليزية

Loading...
Loading...
Abstract

Stress is a basic concept which is concerned with the phenomenon of prominence in a word as a result of more effort in breath during its articulation. The problem of the current study is concerned with investigating simple word stress and discovering its patterns according to their grammatical categories in one of the local languages used in Kirkuk community. The data is collected from everyday life conversations, they are classified according to their grammatical categories and analysed according to the number of their syllable structures, checked by a group of academic native speakers of Turkmen. The validity of the date are analysed acoustically by Praat software program so as to verify the auditory analysis and to make sure that stress assignment is accurate. The study aims at getting a clear insight of the rules of stress in Iraqi Turkmen. The area of investigation is restricted to simple words of Iraqi Kirkuk Turkmen. In order to carry out the study, it is hypothesized that the stress rules of two-syllable and multi-syllable words are the same in Iraqi Turkmen; and any deviation in stress position in Iraqi Turkmen leads to changes in the meaning and the grammatical categories of the words. Among the conclusions arrived at is that, in Iraqi Turkmen, stress mostly placed on the last syllable in disyllabic and multi-syllable words irrespective of the syllable structure.

النبر هو احد المفاهيم اللغوية الاساسية والذي يتعلق بظاهرة البروز في كلمة واحدة او جزء من كلمة ما نتيجة لبذل المزيد من الجهد في التنفس اثناء اخراج تلك الكلمة او الجزء من الكلمة, وبهذا فإن هذه الميزة الخاصة بعلم الاصوات وعلم النظام الصوتي تكاد تكون موجودة في كل لغة. ان مشكلة الدراسة الحالية تهتم بالتحقيق في النبر في الكلمات البسيطة في اللغة التركمانية العراقية. تم جمع البيانات من المحادثات اليومية وتم تصنيفها حسب الفئات النحوية وتحليلها حسب عدد مقاطعها, فيما بعد تم التحقق منها من قبل مجموعة من الناطقين الاصليين من الاكاديميين التركمان. وأخيرا تم تحليل عينات من البيانات الاصلية آلياً وذلك باستخدام برنامج Praat للتحقق من التحليل السمعي السابق. الدراسة تهدف الى ايجاد رويه واضحة عن قوانين النبر في اللغة التركمانية. ان مجال وحدود البحث تقتصر على التحقيق في البيانات الخاصة بالكلمات البسيطة في اللغة التركمانية العراقية. من اجل الشروع بإجراءات البحث يفترض ما يأتي: 1-ان قواعد النبر في الكلمات ذات المقطعين لا تختلف عنها في الكلمات ذات المقاطع المتعددة في هذه اللغة.٢-ان اي تحريف في مواضع النبر يؤدي الى تغيير في المعنى وفي الفئات النحوية للكلمات. توصلت الدراسة الى عدة استنتاجات ومن بينها ان النبر في اللغة التركمانية يظهر على المقاطع الاخيرة في الكلمات ذات المقطعين, والكلمات ذات المقاطع المتعددة, بغض النظر عن بنية المقطع, وقد ظهرت بعض الاستثناءات وبالأخص عندما تكون هذه الكلمات متبوعة بحروف الجر


Article
The impact of dental environment stress on caries experience, salivary flow rate and uric acid

Authors: Raghad Ibrahim Kadhum --- Alhan Ahmed Qasim
Journal: Journal of baghdad college of dentistry مجلة كلية طب الاسنان بغداد ISSN: 16800087 Year: 2020 Volume: 32 Issue: 1 Pages: 35-41
Publisher: Baghdad University جامعة بغداد

Loading...
Loading...
Abstract

Background: Several pathologies of the oral cavity have been associated with stress. Dental students need to gain assorted proficiencies as theoretical knowledge, clinical proficiencies, and interpersonal dexterity which is accompanied with high level of stress. Uric acid is the major antioxidant in saliva. The aim of this study is to assess the dental caries experience among dental students with different levels of dental environment stress in relation to physicochemical characteristics of whole unstimulated saliva.Materials and Methods: the total sample is composed of 300 dental students (73 males, 227 female) aged 22-23 years old, from collage of dentistry / university of Baghdad, from the 4th and 5th grade. The total sample was classified into three categories (mild stress, moderate stress and severe stress) according to Dental environment stress questionnaire (DESQ); Diagnosis and recording of dental caries were assessed according to Decay, Missed, Filled surface and teeth index (DMFS, DMFT) of WHO criteria in 1987. Unstimulated salivary samples were collected from the 95 dental students from the mild stress group (27 male, 28 female) and from the severe stress group (11 male, 29 female). Then, salivary flow rate was measured and chemically analyzed to determine salivary uric acid concentration. All data were analyzed using statistical package for social science (SPSS) version 21.Results: The mean value of the DMFT and DS fraction was higher among severe stress group of dental environment stress scale with no significant differences (P≥ 0.05), while DMFS, FS and MS fractions were higher among moderate stress group of dental environment stress scale with no significant differences (P≥ 0.05). The data from salivary analysis showed that the mean value of salivary flow rate was lower among severe dental environment stress category than mild dental environment stress category but the difference was statistically not significant, while the mean value of uric acid was higher among students with severe dental environment stress than students with mild dental environment stress with statistically significant difference. The flow rate was negatively correlated with caries experience among both mild and severe stress groups except for the DS was positively correlated with flow rate among students with mild stress. The correlation of uric acid with DMFT was negative among students with mild stress while among severe stress group was positive; however all these correlations were not statistically significant.Conclusion: Dental environment stress appears to affect oral health, shown by higher caries prevalence among dental students with moderate and severe dental environment stress level by affecting the normal level of salivary flow rate and uric acid.


Article
Molecular characterization of heat shock protein 70 gene in Iraqi buffalo
التوصيف الجزيئي لجين بروتينات الصدمة الحرارية 70 في الجاموس العراقي

Author: H.N. Habib حسن نعمة حبيب
Journal: Iraqi Journal of Veterinary Sciences المجلة العراقية للعلوم البيطرية ISSN: 16073894/20711255 Year: 2020 Volume: 34 Issue: 1 Pages: 139-143
Publisher: Mosul University جامعة الموصل

Loading...
Loading...
Abstract

The heat shock protein 70 (HSP 70) has important roles in protecting cells and keeping them alive when exposed to different stress conditions. The polymorphism of the hsp 70 gene could be linked with the ability of stress tolerance. This study aimed to determine the polymorphism of the hsp 70 gene in Iraqi buffaloes and study bits effects on the resistance to stress. This study was conducted during from November 2018 to February 2019. The number of buffalo females used was 35 at the age of 4 - 6 years, which belonged to the local farmers from Basra city, Iraq. The DNA was extraction from the blood samples then the polymerase chain reaction (PCR) amplification was performed. The DNA sequences were analyzed by using bioinformatics analysis. The results of the molecular analysis showed that there were two groups of the hsp 70 gene as a compare with the same genes in GenBank due to silent and missense mutations. Based on these findings, it can be concluded that the Iraqi buffaloes have adapted to the surrounding environmental conditions as a result of the action of HSP 70 proliferation. The hsp 70 gene was a useful biomarker of stress tolerance in buffaloes.

تلعب بروتينات الصدمة الحرارية 70 دور مهم في حماية الخلايا وإبقائها على قيد الحياة عند تعرضها لظروف الإجهاد المختلفة. ترتبط التشكلات الوراثية لجين hsp 70 بقدرة الكائنات على تحمل ظروف الإجهاد المختلفة. هدفت هذه الدراسة إلى الكشف عن التشكلات الوراثية لجين hsp 70 في الجاموس العراقي. أجريت الدراسة خلال الفترة من تشرين الثاني 2018 إلى شباط 2019. تم استخدام خمسة وثلاثين من إناث الجاموس في سن 4-6 سنوات، والتي كانت تابعة للمزارعين المحليين من مدينة البصرة، العراق. تم استخراج الحمض النووي من عينات الدم ثم تم إجراء تضخيم باستخدام تفاعل السلسلة المتبلمرة من اجل الحصول على تسلسل الحمض النووي. لإجراء بعض تحليلات المعلوماتية الحيوية. أظهرت نتائج التحليل الجزيئي أن هناك مجموعتين من جين hsp 70 كمقارنة مع بنك الجينات وذلك بسبب حدوث الطفرات الصامتة والمحسوسة. بناءً على هذه النتائج، يمكن أن نستنتج أن الجاموس العراقي قد تكيف مع الظروف البيئية المحيطة إذ إنه يمكن ان يعد جين hsp 70 واسم جزيئي لتحمل ظروف الإجهاد المختلفة.


Article
Oxidative stress status in hypertensive patients on amlodipine treatment

Authors: Bahaa Noor Madhloom --- Ameena Ryhan Diajil
Journal: Journal of baghdad college of dentistry مجلة كلية طب الاسنان بغداد ISSN: 16800087 Year: 2020 Volume: 32 Issue: 1 Pages: 1-8
Publisher: Baghdad University جامعة بغداد

Loading...
Loading...
Abstract

Background: Oxidative stress may contribute to the etiology of hypertension in humans. Oxidative stress is an imbalance between reactive oxygen species (ROS) and antioxidant defense mechanisms, causing damage to biological macromolecules and dysregulation of normal metabolism and physiology. Amlodipine as an antihypertensive agent is a long-acting calcium channel blocker that dilates blood vessels and improves blood flow.The aim of this study was to assess the oxidative stress in hypertensive patients on Amlodipine treatment through the assessment of salivary Malondialdehyde (MDA) and superoxide dismutase (SOD) as a marker of oxidative stress. Material and method: 60 individuals were included in this study, divided into two groups; the first group composed of 30 hypertensive patients on Amlodipine antihypertensive agent. The second group, the control group, composed of 30 healthy subjects without any systemic disease and with almost healthy oral hygiene. Intraoral examination was done for each individual and salivary samples were collected with the salivary flow rate (F/R) which was calculated in ml per minute and pH was measured by pH meter. Salivary MDA and SOD were analyzed by using ELISA kit based on the principle of competitive enzyme immunoassay technique; the concentrations of markers were measured by spectrophotometer at 450nm in a microplate reader. Results: Salivary MDA was significantly higher in hypertensive patients compared to control, while salivary SOD was significantly lower in patients than control group. Salivary flow rate and pH was significantly lower in patients as compared to the control group.Conclusions: There is a relation between oxidative stress and hypertension. Salivary MDA and SOD can be used as potential marker for monitoring patients with Hypertension.


Article
Estimation and Isolation of Ceruloplasmin and Some Biochemical Indicators in Diabetes Mellitus Type II Patients Compared to Healthy Controls in Kirkuk Province, Iraq

Author: Karam Yahya Noah, Farah Khalaf Hmood, Israa Ghassan Zainal
Journal: Medical Journal of Babylon مجلة بابل الطبية ISSN: 1812156X 23126760 Year: 2020 Volume: 17 Issue: 1 Pages: 49-53
Publisher: Babylon University جامعة بابل

Loading...
Loading...
Abstract

Background: The pathogenesis of diabetes mellitus (DM) was affected by oxidative stress. Many inflammatory markers having antioxidantproperty, among them ceruloplasmin (CP), which is the appropriate candidate to recognize the general insulin resistance in patients sufferingfrom DM- Type II. Objectives: This study aimed to estimate some biochemical parameters (that considered markers of oxidative stress)in patients with DM type II (DM‑II) compared to healthy controls and study the correlation between them. Materials and Methods: Thisstudy included 75 samples of blood serum divided into (50) samples (26 males and 24 females) as patients with DM‑II. The control groupincluded 25 healthy controls (15 males and 10 females). Ceruloplasmin (CP) was isolated from human serum using 60% ammonium sulfateprecipitation, then estimated the activity and specific activity of enzyme. The isolated enzyme was characterized by 10% polyacrylamide gelelectrophoresis. Some biochemical indicators were also estimated. These included random blood sugar (RBS), total protein, thiol, free amino,and carbonyl. Results: The electrophoresis results for both protein and glycoprotein stain indicated that the bands of CP in patients group havemore intensity than the bands of healthy controls. There were nonsignificant increase in total protein, thiol/protein, carbonyl and carbonyl/protein levels, nonsignificant decrease in the free amino and free amino/protein levels, and significant increase in the RBS and thiol levelsin patients group compared to healthy controls. The correlation results indicated that there were significant positive correlation between CPand RBS with r = 0.306. Conclusion: The findings may support an association between oxidation proteins and DM‑II. The stronger responseobserved in serum CP and thiol from patients with the change in the concentration of proteins which suggest that these oxidative proteinsmarkers contents may be useful in evaluating the progression of DM‑II and in elucidating the mechanisms of disease pathogenesis.


Article
Haematological, oxidative stress and electrolyte alterations in puppies with canine parvoviral enteritis
دراسة التغيرات الدموية والاجهاد التأكسدي والتغيرات في الكهارل في الجراء المصابه بالتهاب الأمعاء البارفوالفيروسي

Loading...
Loading...
Abstract

Haematological changes, oxidative stress markers and electrolyte alterations were evaluated in puppies infected with canine parvovirus type 2 (CPV-2) that were presented to veterinary hospitals and clinics in South Eastern, Nigeria. Fifty-one dogs were used for the study and they were assigned into three groups. Group I consist of 21 diarrhoeic dogs naturally infected with canine parvovirus, groups II, were 15 diarrhoeic dogs uninfected with canine parvovirus and group III, were 15 apparently healthy dogs which served as the control. Immunochromatographic (IC) test was used to screen the dogs for canine parvovirus type 2 infections. The mean red blood cell (RBC) counts, packed cell volume (PCV) and haemoglobin (HB) concentrations were significantly lower in the diarrhoeic infected than diarrhoeic non-infected and the control groups. The mean catalase (CAT) of diarrhoeic non-infected group was significantly lower than diarrhoeic infected group and the control. The mean malondialdehyde (MDA) of both diarrhoeic infected and diarrhoeic non-infected groups were significantly higher than the control. The mean serum sodium (Na+) level of the diarrhoeic non infected group was significantly lower than the diarrhoeic infected group. The mean serum potassium (K+) level was significantly lower both in diarrhoeic infected and diarrhoeic non-infected groups compared to the control groups. It was therefore concluded that the levels of oxidative stress and electrolyte alterations may not be affected by the origin or aetiology of a disease (CPV-2), but on the severity of the infection.

هدف البحث الى تقييم التغيرات الدموية، علامات الإجهاد التأكسدي والتغيرات في الالكترولايت في الكلاب المصابة بفيروس بارفوف من النوع 2 (CPV-2) التي قدمت للمستشفيات والعيادات البيطرية في جنوب شرق نيجيريا. استخدم واحد وخمسون كلب في الدراسة تقسيم الكلاب المصابة الى ثلاث مجموعات. المجموعة الأولى تتكون من 21 كلب كان يعاني من أسهال ومصاب بشكل طبيعي بفيروس بارفو، المجموعة الثانية ، 15 كلب إسهال غير مصاب بفيروس البارفو والمجموعة الثالثة ، وكان 15 كلبًا صحيًا على ما يبدو كان بمثابة مجموعة السيطرة. تم استخدام اختبار المناعي (IC) لفحص الكلاب من النوع 2 من فيروسات parvovirus. كانت متوسط تعداد خلايا الدم الحمراء (RBC) ، وحجم الخلية المعبأة (PCV) وتركيزات الهيموغلوبين (HB) أقل بشكل ملحوظ في الكلاب المصاب بالإسهال من غير المصاب ومجموعات المراقبة. وكان متوسط الكاتلاز (CAT) من المجموعة غير المصابة بالإسهال أقل بكثير من المجموعة المصابة بالإسهال والسيطرة عليها. وكان متوسط malondialdehyde (MDA) من كل من الإسهال المصابة والإسهال غير المصابين المجموعات أعلى بكثير من السيطرة. كان متوسط مستوى الصوديوم في الدم (Na +) في المجموعة غير المصابة بالإسهال أقل بكثير من المجموعة المصابة بالإسهال. كان متوسط مستوى البوتاسيوم في المصل (K +) أقل بشكل ملحوظ سواء في المجموعات المصابة بالإسهال أو غير المصابة بالإسهال مقارنة بمجموعات التحكم. وبالتالي، فقد تم التوصل إلى أن مستويات الإجهاد التأكسدي والتعديلات بالكهرباء قد لا تتأثر بأصل أو مسببات المرض (CPV-2) ، ولكن على شدة العدوى.


Article
The relationship between HSP70 and level of leptin and luteinizing hormones in female rats exposed to chronic and acute heat stress
العلاقة بين مستوى بروتين الصدمة الحرارية 70 وهرموني اللبتين واللوتيني في إناث الجرذان المعرضة للإجهاد الحراري المزمن والحاد

Authors: H.N. Matty هيام نذير متي --- A.A. Hassan أشواق أحمد حسن
Journal: Iraqi Journal of Veterinary Sciences المجلة العراقية للعلوم البيطرية ISSN: 16073894/20711255 Year: 2020 Volume: 34 Issue: 1 Pages: 37-43
Publisher: Mosul University جامعة الموصل

Loading...
Loading...
Abstract

The current search experiments designed to study the effect of chronic and acute heat stress on the relationship between HSP70, leptin and luteinizing hormones level in female rats. 45 female pups were used in the age of weaning, were randomly divided into three equal groups. 1st group was a control group, 2nd group exposed to chronic heat stress at 38 ºC for 1hour a day since the age of weaning until onset of puberty and the 3rd group exposed to acute heat stress at 38 ºC for 4 hours per day for 5 consecutive days from 35 day age of rat and each group above were secondary divided into 3 age groups consisted of pre-puberty, at puberty and post-puberty. Results of study showed female rats exposed to chronic and acute stress led to significant increase in the level of luteinizing hormone at onset of the puberty. The result showed correlation coefficient between the level of HSP70 and leptin hormone significantly in the females acute stressed group at onset of puberty, as well as female exposed to chronic heat stress led to significant correlation coefficient between HSP70 and leptin hormone at post puberty. The result revealed significant correlation coefficient between HSP70 and luteinizing hormone in female control group at onset of puberty. It concluded from this study there is relationship between HSP70 and leptin hormone at onset puberty during acute heat stress and same relationship at post puberty during chronic heat stress.

صُممت تجارب البحث الحالي لدراسة تأثير الإجهاد الحراري المزمن والحاد على العلاقة بين مستوى بروتين الصدمة الحرارية 70 وهرمون اللبتين والهرمون اللوتيني في إناث الجرذان. أُستخدم 45 أنثى من الجرذان في عمر الفطام قُسمت الحيوانات عشوائيا إلى ثلاث مجاميع متساوية، وشملت مجموعة السيطرة، والمجموعة المعرضة للإجهاد الحراري المزمن بدرجة حرارة 38 ºم لمدة ساعة واحدة يوميا منذ عمر الفطام حتى بدء البلوغ الجنسي، والمجموعة المعرضة للإجهاد الحراري الحاد بدرجة حرارة 38 ºم لمدة 4 ساعات يوميا ولخمسة أيام متتالية ابتداءً من اليوم 35 من عمر الجرذ، قسمت المجاميع المذكورة في أعلاه ثانويا إلى ثلاث فئات عمرية تمثلت مرحلة قبل البلوغ ومرحلة بدء البلوغ ومرحلة بعد البلوغ الجنسي. أظهرت النتائج ان تعرض الجرذان للإجهاد الحراري الحاد والمزمن إرتفاعاً معنوياً في مستوى الهرمون اللوتيني عند مرحلة بدء البلوغ مقارنة بمجموعة السيطرة. وأظهرت النتائج وجود ارتباط طردي معنوي بين بروتين الصدمة الحرارية 70 وهرمون اللبتين في إناث الجرذان للمجموعة المعرضة للإجهاد الحراري الحاد عند مرحلة بدء البلوغ الجنسي، فضلا عن تعرض الإناث للإجهاد الحراري المزمن أدى إلى حدوث ارتباط طردي معنوي بين بروتين الصدمة الحرارية 70 وهرمون اللبتين عند مرحلة بعد البلوغ. وبينت النتائج وجود ارتباط طردي معنوي بين بروتين الصدمة الحرارية 70 والهرمون اللوتيني في إناث مجموعة السيطرة عند مرحلة بدء البلوغ. يستنتج من الدراسة وجود علاقة ارتباط طردية بين بروتين الصدمة الحرارية 70 وهرمون اللبتين عند مرحلة البلوغ عند التعرض للإجهاد الحراري الحاد وظهرت العلاقة ذاتها في مرحلة بعد البلوغ عن التعرض للإجهاد الحراري المزمن.


Article
Comparative study of the antioxidant effects of lavender and flax oils in recurrent aphthous ulceration treatment

Authors: Shaheen A. Ahmed --- Taghreed Altaei --- Talar Ahmed
Journal: Journal of baghdad college of dentistry مجلة كلية طب الاسنان بغداد ISSN: 16800087 Year: 2020 Volume: 32 Issue: 1 Pages: 48-50
Publisher: Baghdad University جامعة بغداد

Loading...
Loading...
Abstract

Background: Recurrent aphthous ulceration (RAU) is an inflammatory condition of unknown etiology characterized by painful recurrent (single or multiple) ulcerations of the oral mucosa. It is one of the most common and poorly understood mucosal disorders. It occurs more frequently in times of stress. Local and systemic conditions, genetic, immunologic, microbial factors, and oxidative stress may play a role in the pathogenesis of RAU. The objective of this study was to evaluate the free radical metabolism and antioxidant activity of RAU patients treated by lavender or flax oil paint.Methods: Sixty-six RAU patients were enrolled in this prospective randomized double-blind placebo-controlled study. Analysis of the plasma levels of malondialdehyde (MDA), glutathione (GSH), Nitric oxide (NO), myeloperoxidase (MPO), Vit. E, Vit. C, and Trolox equivalent antioxidant capacity (TEAC) were determined. The ulcer size, healing time, and healing process were correlated to the plasma levels of the studied parameters for the assessment of the antioxidant mechanism of action of lavender and flax oil paint in the treatment of RAU.Results: Statistical analysis showed that lavender antioxidant action was higher than flax oil paint compared to placebo. The decreased oxidative stress and the damage caused by free radicals was significant in the lavender group than both flax group and placebo (P<0.001).Conclusion: This study proves the significant antioxidant mechanism of both lavender and flax in the treatment of RAU patients.


Article
Redrawing Operation a Star Shape from Cylindrical Shape Using Experimental and FE Analysis

Authors: Waleed Kh. Jawad --- Ali T. Ikal
Journal: Engineering and Technology Journal مجلة الهندسة والتكنولوجيا ISSN: 16816900 24120758 Year: 2020 Volume: 38 Issue: 1 Part (A) Engineering Pages: 26-33
Publisher: University of Technology الجامعة التكنولوجية

Loading...
Loading...
Abstract

The aim of this paper is to design and fabricate a star die and a cylindrical die to produce a star shape by redrawing the cylindrical shape and comparing it to the conventional method of producing a star cup drawn from the circular blank sheet using experimental (EXP) and finite element simulation (FES). The redrawing and drawing process was done to produce a star cup with the dimension of (41.5 × 34.69mm), and (30 mm). The finite element model is performed via mechanical APDL ANSYS18.0 to modulate the redrawing and drawing operation. The results of finite element analysis were compared with the experimental results and it is found that the maximum punch force (39.12KN) recorded with the production of a star shape drawn from the circular blank sheet when comparing the punch force (32.33 KN) recorded when redrawing the cylindrical shape into a star shape. This is due to the exposure of the cup produced drawn from the blank to the highest tensile stress. The highest value of the effective stress (709MPa) and effective strain (0.751) recorded with the star shape drawn from a circular blank sheet. The maximum value of lamination (8.707%) is recorded at the cup curling (the concave area) with the first method compared to the maximum value of lamination (5.822%) recorded at the cup curling (the concave area) with the second method because of this exposure to the highest concentration of stresses. The best distribution of thickness, strains, and stresses when producing a star shape by redrawing the cylindrical shape into a star shape

Listing 1 - 10 of 17 << page
of 2
>>
Sort by
Narrow your search

Resource type

article (17)


Language

English (14)


Year
From To Submit

2020 (17)