In this study, the influences of both stirrup spacing and anchorage performance on the residual strength of corroded RC beams are investigated. With the increase of stirrup spacing, the applied load is easily transferred to the anchorage region, and with the increase of the corrosion ratio of rebar, the mechanism of corroded RC beams shifts from beam action to arch action. In the case of non-uniform corrosion of the main rebar, the maximum deviation ratio of the corrosion ratio of main rebars is over 0.9, and the beam suffers flexural failure due to the yielding of rebars in the extremely corroded region. In the case of uniform corrosion of the main rebars, the maximum deviation ratio of the corrosion ratio of main rebars is below 0.9, and there are two situations. If the bottom portions of the stirrups are sufficient, the applied load is restricted in the support span, and the corroded beam presents a flexural failure mode. On the other hand, if the bottom portions of the stirrups are insufficient, the applied load is transferred to the anchorage, and the corroded beam is inclined to suffer bond failure. Moreover, when the beam suffers bond failure, the residual strength depends on the anchorage performance.

No abstract

No abstract

Guillain-Barre syndrome (GBS) is a common condition in neurological clinical practice. Generally, it is characterized by almost symmetrical flaccid paralysis, extending from the lower limb to upper limb or vice versa. Gloves and socks paresthesia may precede the motor symptoms, but objective sensory loss seldom occurs during the course. Bladder and bowel functions are normal, which is often considered the main discrimination from acute myelitis. Protein-cellular dissociation in the cerebro-spinal fluid is another feature in the diagnosis [1]. Although GBS often takes the form of acute or subacute polyneuropathy and is preceded by viral or ambiguous infection, some types of such neuropathy are actually a manifestation of the remote effect of cancer or are directly associated with non-Hodgkin lymphoma of both T-and B-cells [2]. When making a diagnosis and adopting treatment procedures, a neurologist must perform complete examinations on the central nervous system in case of omitting possible severe conditions.A male Chinese man at the age of 65 complained of numbness and weakness of the four limbs for about 8 days. His previous history was unremarkable. On neurological examination, he was conscious and mentally normal. His cranial nerves were normal with the exception of the right Horner syndrome. The joint and vibration sensations on both sides were normal, but the pain and temperature sensation on the left limbs were slightly reduced than on the right. The grasping power of the two hands was reduced (grade of 4/5), and he was able to stand up continuously for 5 times. He adopted a steppage gait when walking. The knee and the ankle reflexes on both sides were markedly diminished. The plantar reflexes were flexor. His bladder and bowel functions were normal. According to these symptoms and signs, GBS was considered, but it is obviously not typical because the patient has right Horner sign and the pain-temperature sensation on the left reduced than that on the right. The patient was transferred to the Department of Emergency, waiting for lumbar puncture. Subsequent cerebro-spinal fluid showed that the protein was 0.71 g/L and the total number of cells was 2250 9 10 6 /L, but the number of white blood cells was only 2. Unfortunately, on the second day after the lumbar puncture, his weakness worsened and he suffered from urinary retention, so catheterization was adopted.At this time, the spinal cord involvement was suspected. About 500 mg of methyprednisolone was intravenously used, and cervical spine MRI was performed immediately. To our surprise, the MRI revealed that the cervical cord was not with myelitis but with a tumor. On MRI, the tumor was epidural at the segment of C7 and the upper cord was swollen. It was homogeneously enhanced after Gadolinium contrast agent was used ( Figure 1). Then, the patient was admitted to the Department of Neurosurgery. On operation, it was found that the abnormal tissue originated from the dorsal root ganglion and invaded into the canal through the C7-T1 intervertebral foramen. Th...

Micro nanotechnology refers to the emerging technology of material production using a single atomic or molecular structure. The structure and size of materials range from one to 100 microns or nanometers. In this paper, micro nanotechnology is used to study the aesthetic practice of sculpture technology and architectural sculpture art. This paper aims to combine traditional art ideas with science and technology to promote common development. This paper first introduces the micro nanoengraving technology and architectural sculpture art, it includes the definition of works, classification of works, and research on artistic commonalities and differences, and then summarizes the characteristics of micro nanoengraving materials. Finally, this paper will carry out aesthetic practice of sculpture works based on micro nanocreation. Finally, this paper compares with the works created by traditional technology. The results show that the recognition and creativity evaluation of sculpture works based on micro nanocreation have reached more than 8 points. It verifies the effectiveness of the technology.