A two-dimensional contact problem for an elastic layer of a finite thickness is considered with the effects of friction and wear taken into account. It is assumed that the contact zone is constant, ...but the shape of a wear-resisting punch changes during the sliding wear process. The punch is loaded by constant external normal and tangential loads, the latter of which is equal to the maximum value predicted by Coulomb’s law. The steady-state profile of the punch, which has been reproduced in the steady-state wear regime, is determined in an integral form. In the case of a very thick layer, explicit formulas are given for the initial vertical displacement of the punch and the moment of contact pressures, both of which vary during the wear process. The duration of the wearing-in process is estimated, and it is shown that the effect of friction extends the wearing-in period.
To investigate the clinical characteristics and prognoses of patients with anaplastic thyroid carcinoma(ATC), and to explore the value of multi-modality treatment in improving overall survival(OS) of ...ATC patients.
Medical records including clinicopathological data of patients diagnosed with ATC at Cancer Hospital, Chinese Academy of Medical Sciences between 2001 and 2020 were retrospectively analyzed. The cohort were divided into surgery-only and multi-modality subgroups, and the latter included patients treated with surgery plus radiotherapy and/or medical therapy(including chemotherapy, target therapy and immunotherapy). Univariate survival analysis was conducted through Kaplan-Meier method, and multivariate survival analysis was performed using Cox proportional hazard model.
A total of 47 patients were included in the study, including 24 males and 23 females, with a median age of 63 years. After a median follow-up duration of 3.37 months, 42 patients died due to tumor recurrence or progression. The median
This research examined the hypothesis that the concept of power is
mentally associated with different goals for individuals with a communal versus
an exchange relationship orientation (
M. S. Clark & ...J. Mills,
1979
). It was predicted that communals associate power
with social-responsibility goals, whereas exchangers link power
with self-interest goals. Thus, when power is
activated, distinct goals should be ignited for communals and
exchangers. Power was primed unobtrusively using semantic cues in Study
1 and using naturally occurring, environmental cues in Studies 2 and
3. Across studies, power-primed communals responded in
socially responsible ways, whereas power-primed exchangers acted
more in line with their self-interests. These power-goal
effects occurred nonconsciously. Overall, the data support taking
a Person × Situation approach-one that allows for moderators such
as relationship orientation-to understand power's positive and
negative effects.
This article reports the fabrication of high-fill-factor plano-convex cylindrical and spherical microlens arrays horizontally and vertically embedded in a photosensitive Foturan glass chip by ...femtosecond (fs) laser micromachining. The microlens arrays were fabricated by modifying the microstructure of Foturan glass using fs laser direct writing followed by thermal treatment, wet etching, and additional annealing. The focusing ability and image quality of the microlens arrays were examined, showing that the lens arrays not only can focus light well but also provide an imaging capability that holds great potential for lab-on-a-chip applications.
To present our experience of using a combination of intra-articular osteotomy and external fixation to treat different deformities of the knee.
A total of six patients with a mean age of 26.5 years ...(15 to 50) with an abnormal hemi-joint line convergence angle (HJLCA) and mechanical axis deviation (MAD) were included. Elevation of a tibial hemiplateau or femoral condylar advancement was performed and limb lengthening with correction of residual deformity using a circular or monolateral Ilizarov frame.
At a mean follow-up of 2.8 years (1.5 to 4.1), the mean HJLCA improved from 15.6° (10° to 23°) pre-operatively to 0.4° (0° to 2°). The mean MAD improved from 70.0 mm (20.1 to 118.5) pre-operatively to 9.1 mm (3 to 15). The mean tibiofemoral angle improved from 31.0° (8° to 54°) pre-operatively to 4.9° (2° to 8°). The mean limb-length discrepancy decreased from 6.3 cm (2.9 to 13.6) pre-operatively to 1.1 cm (0 to 5). All osteotomies and distraction zones healed without complications.
The use of intra-articular corrective osteotomies combined with the Ilizarov technique allowed correction of deformities of the knee joint with satisfactory HJLCA and overall mechanical axis in six patients with a good functional and cosmetic outcome in the short term. Cite this article: Bone Joint J 2017;99-B:204-10.
Large inelastic tensile strains and wide horizontal cracks primarily caused by in-plane loading, may lead to local out-of-plane deformations of the end regions of reinforced concrete (RC) walls ...within a buckled zone that comprises the plastic hinge length. Critical parameters that influence the onset of this failure mode have been studied through past experimental tests on RC prisms subjected to axial loading, which simulates the response of end regions of RC walls under in-plane demands. Missing from those studies is the effect of bidirectional loading protocols and the effect of the longitudinal reinforcement ratio on the hysteretic response. Therefore, 12 RC prisms with 3 longitudinal steel ratios representative of prototype boundary elements of typical special RC walls and piers walls were tested. The experimental results showed that the longitudinal steel content and the in-plane loading demands mainly govern the onset of out-of-plane buckling instability of planar RC walls.
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