Numerical study on the forward and inverse problems of the mobile pump truck frame.

Aiming at the requirements of strong mobility and high flexibility of rescue and relief mobile pump trucks, this paper designs a new type of mobile pump truck frame based on existing mobile vehicle frame models. The materials used for the frame are 40Cr and Q235, and the finite element method is utilized to carry out static mechanical analysis and dynamic characteristic analysis. Simultaneously utilizing topology optimization and multi-objective genetic algorithm to optimize the design of the frame structure.

Optimization design and analysis of mobile pump truck frame using response surface methodology.

In order to realize the lightweight design of mobile pump truck, this paper takes the frame of a certain type of mobile pump truck as the research object. The response surface method is used to carry out lightweight design of the longitudinal beam structure of the frame, and the finite element method is used to establish the finite element model to compare and analyze the optimized and original designs. The results show that the height, width and thickness of the optimized longitudinal beam section are reduced by 10mm, 11mm, and 0.

Prenatal diagnosis of triphalangeal thumb-polysyndactyly syndrome by ultrasonography combined with genetic testing: A case report.

Background: Triphalangeal thumb-polysyndactyly syndrome (TPT-PS) is a rare type of congenital limb deformity, and most studies focus on the genetics. Case reports of the sonographic characteristics of TPT-PS during pregnancy are rare.

Case Summary: A 30-year-old woman (G3P1) who had pregnancies with TPT-PS fetuses is presented.

Morphometric measurement of lower lumbar intervertebral foramina based on digital three-dimensional simulation.

Aim: This study aimed to investigate the morphology of the lower lumbar intervertebral foramina through use of a digital three-dimensional (3D) simulation model to guide the endoscope through the intervertebral foramina.

Material And Methods: Individuals without disease affecting the lumbar vertebrae underwent computed tomography (CT) scanning in the supine position. The CT images obtained were imported to medical software to reconstruct a 3D model of the lumbar vertebrae.

The value of repeated CT in monitoring the disease progression in moderate COVID-19 pneumonia: A single-center, retrospective study.

The role of thoracic CT (computerized tomography) in monitoring disease course of COVID-19 is controversial. The purpose of this study is to investigate the risk factors and predictive value of deterioration on repeatedly performed CT scan during hospitalization.All COVID-19 patients treated in our isolation ward, from January 22, 2020 to February 7, 2020, were reviewed.

Digital logic circuit based on two component molecular systems of BSA and salen.

A new fluorescent molecular probe 1 was designed and constructed by combining bovine serum albumin (BSA) and N,N'-bis(salicylidene)ethylenediamine (salen). Stimulated by Zn, tris, or EDTAHNa, the distance between BSA and salen was regulated, which was accompanied by an obvious change in the fluorescence intensity at 350 or 445nm based on Förster resonance energy transfer. Moreover, based on the encoding binary digits in these inputs and outputs applying positive logic conventions, a monomolecular circuit integrating one OR, three NOT, and three YES gates, was successfully achieved.

Grass carp (Ctenopharyngodon idellus) invariant chain of the MHC class II chaperone protein associates with the class I molecule.

The invariant chain (Ii) is an important immune molecule, as it assists major histocompatibility complex (MHC) class II molecules to present antigenic peptides. The relationship between the Ii and MHC molecules in teleosts remains poorly understood. This study focused on the molecular structure of grass carp Ii (gIi), its organ distribution, correlations with gene transcription, and the association with MHC.

[The correlation between the level of serum VEGF and bFGF with metastasis and prognosis of osteosarcoma].

Aim: To investigate the correlation between the level of serum VEGF and bFGF with metastasis and re- currence of osteosarcoma.

Methods: 52 patients with osteosarcoma and 60 healthy people as control group were selected. The serum contents of VEGF and bFGF were determined with ELISA before and after operation.

[Preliminary clinical study on the posterior lumbar minimally invasive surgery assisted by 3D-Viewer system under a direct vision].

Objective: To study the methods and preliminary clinical efficacy of posterior lumbar minimally invasive surgery assisted by 3D-Viewer system under a direct vision and provide rationales for further clinical applications.

Methods: From September 2008 to September 2009, a total of 84 lumbar degenerative disease patients were enrolled and randomly divided into 2 groups (n = 42 each). One group was treated operatively by 3D-Viewer system under a direct vision while another treated with conventional operations.

[Metrx quadrant system in the surgery of lumbar spondylolisthesis: preliminary clinical application].

Objective: To evaluate the clinical efficacy and minimal invasiveness of quadrant posterior distraction system in the posterior lumbar spondylolisthesis (LS) surgery.

Methods: Sixty-one LS patients were randomly divided into two groups: quadrant posterior minimally invasive surgery system as invasive group (n = 30) and traditional open surgery as open group (n = 31). The clinical outcome of pain relief was assessed by the scoring systems of visual analogue scale (VAS) and Oswestry disability index (ODI) for low back pain.

[Experimental study of reservation flaval ligament on prevention of peridural adhesion after operation on lumbar disc].

Objective: Through an experiment in rabbits, to evaluate the role of reservation flaval ligament using different methods to prevent the epidural adhesion by observing the morphological changes and provide experiment evidences for clinic.

Methods: 45 adult rabbits were divided into three groups: Group A (treated with no reservation of flaval ligament), Group B (treated with reserving half flaval ligament), and Group C (treated with reserving the complete flaval ligament). Every group has 15 rabbits.

[Research process on dynamic stabilization system of low back pain].

Dynamic stabilization system plays an important role in the treatment of the degenerative lumbar spine. Fusion of short movement segments has little influences on the motion of lumbar spine. Meanwhile, preservation of movements of segment can prevent the degeneration of adjacent segment and maintain the possibility of disc replacement even under the condition that facet joints need to be excised.

[Bony anatomical characteristics of posterolateral region of lumbar vertebrae and clinical significance thereof].

Objective: To offer anatomical supports to the approach of lateral par interarticularis for far lateral lumbar discectomy.

Methods: In 30 lumber spine specimens taken from adult cadavers the relevant osseous distances of posterolateral region of lumbar vertebrae and its changing regularity with the sequences of lumbar spine were measured: (1) width of isthmus; (2) distance from midline to lateral border of vertebral body; (3) distance from lateral margin of isthmus to lateral border of vertebral body; (4) distance from inferior border of transverse process to superior rim of superior facet; (5) distance from accessory process to superior rim of superior facet; and (6) distance from central plane of lumbar disc to superior rim of superior facet.

Results: From L1-L2 towards L5-S1, the operative window representing the operating area of the approach of lateral par interarticularis for far lateral lumbar discectomy became progressively smaller in its longitudinal, transverse direction and outer exit.

[Prevention of dura adherence in spinal canal after microendoscopic discectomy by different methods: a clinical study of 165 cases].

Objective: To evaluate the effects of different methods in prevention of post-operational scar formation and dura adherence in the spinal canal after microendoscopic discectomy (MED).

Methods: 165 patients undergoing MED were randomly divided into 3 equal groups: Group A, with the yellow ligament dissected and with the space between vertebral laminae sprinkled with sodium hyaluronate before the closing of the incision; Group B, with the yellow ligament reserved; and Group C, with the yellow ligament reserved and with the space between vertebral laminae sprinkled with sodium hyaluronate before the closing of the incision. All the patients were followed up 2, 4, and 8 weeks, and 1 and 2 years after the operation.