Normal stress

Newton 1st law: F~m*a SI unit: F = m*a; 1 N = 1kg*m/s2; VD hãy tính gia tốc ban đầu của tảng đá nặng 500 ký trên mặt phẳng nghiêng 30o. Lực: Normal stress (ứng suất thường) σ=trọng lượng/A: Trọng lượng W = khối lượng x g; Khối lượng m = γ*A*z = σ(z) = γ*g*z VD: tỷ trọng trung bình của đất là 2000kg/m3. Hỏi lực thông trường tác động lên bề mặt đất ở độ sâu 3 m là bao nhiêu?

34p dungdiem 21-02-2013 39 6   Download

Chapter 2 - Axial force, shear force and bending moment. The following will be discussed in this chapter: Internal stress resultants; relationships between loads, shear forces, and bending moments; graphical method for constructing shear and moment diagrams; normal, shear force and bending moment diagram of frame.

41p larachdumlanat122 28-11-2020 30 1   Download

Chapter 3 - Axially loaded members. The following will be discussed in this chapter: Normal stress and normal strain, tension and compression test, poisson’s ratio, shearing strain, allowable stress – factor of safety, statically indeterminate problem.

43p larachdumlanat122 28-11-2020 32 1   Download

The human organism is a biophysical system. Stress represents a normal reaction of the organism which appears as a response to an aggression situation which requires an unusual and quick adaptation effort from the organism.

9p christabelhuynh 04-06-2020 32 4   Download

The ÔMediterraneanÕ variant of glucose-6-phosphate dehydrogenase (G6PD) deficiency is due to the C563CT point mutation, leading to replacement of Ser with Phe at position 188, resulting in acute haemolysis triggered by oxidants. Previous work has shown increased formation of altered aspartate residues in membrane proteins during cell ageing and in response to oxidative stress in normal erythrocytes. These abnormal residues are specifically recognized by the repair enzyme L-isoaspartate (D-aspartate) protein O-methyltransferase (PCMT; EC 2.1.1.77). ...

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The retinal pigment epithelium (RPE) is essential for main-tenance of photoreceptors and normally functions under conditions enriched with reactive oxygen species. RPE therefore expresses various defense enzymes against oxida-tive stress, including heme oxygenase-1 (HO-1). HO-1 catalyzes heme breakdown to release iron, carbon monox-ide, and biliverdin, which is reduced to bilirubin, a potent radical scavenger. HO-1 expression is induced by various environmental factors, which has been established as a def-ense mechanism....

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The extracellular signal regulated protein kinases (ERK1/2) are essential for normal development and functional plasti-city of the central nervous system. However, a growing number of recent studies in models of cerebral ischemia, brain trauma and neurodegenerative diseases implicate a detrimental role for ERK1/2 signaling during oxidative neuronal injury. Neurons undergoing oxidative stress-rela-ted injuries typically display a biphasic or sustained pattern of ERK1/2 activation.

7p dell39 03-04-2013 41 3   Download

Heat shock factor (HSF) is an evolutionarily conserved stress-response reg-ulator that activates the transcription of heat shock protein genes, whose products maintain protein homeostasis under normal physiological condi-tions, as well as under conditions of stress. The promoter regions of the target genes contain a heat shock element consisting of multiple inverted repeats of the pentanucleotide sequence nGAAn.

10p viettel02 19-02-2013 35 2   Download

Tuyển tập các báo cáo nghiên cứu về y học được đăng trên tạp chí y học General Psychiatry cung cấp cho các bạn kiến thức về ngành y đề tài: Impaired glucose transporter-1 degradation and increased glucose transport and oxidative stress in response to high glucose in chondrocytes from osteoarthritic versus normal human cartilage...

11p thulanh15 18-10-2011 59 2   Download

Cushing's Syndrome is a disease caused by an excess of cortisol production or by excessive use of cortisol or other similar steroid (glucocorticoid) hormones. Cortisol is a normal hormone produced in the outer portion, or cortex, of the adrenal glands, located above each kidney. The normal function of cortisol is to help the body respond to stress and change. It mobilizes nutrients, modifies the body's response to inflammation, stimulates the liver to raise the blood sugar, and it helps control the amount of water in the body.

5p truongthiuyen1 08-06-2011 74 7   Download