Converting a CAD Model into a Manufacturing Model for the Components Made of a Multiphase Perfect Material

To manufacture the component made of a multiphase perfect material (including homogeneous and multi heterogeneous materials), it CAD model should be processed and converted into layered manufacturing model for further transformation of numerical control (NC) coding. This paper develops its detailed approaches and corresponding software. The process planning is made first and includes: (1) determining the build orientation of the component; and (2) slicing the component into layers adaptively according to different material regions since different materials have different optimal layer thickness for manufacturing. After the process planning, the layered manufacturing models with necessary information, including fabrication sequence and material information of each layer, are fully generated.Mechanical Engineerin

Full-range Gate-controlled Terahertz Phase Modulations with Graphene Metasurfaces

Local phase control of electromagnetic wave, the basis of a diverse set of applications such as hologram imaging, polarization and wave-front manipulation, is of fundamental importance in photonic research. However, the bulky, passive phase modulators currently available remain a hurdle for photonic integration. Here we demonstrate full-range active phase modulations in the Tera-Hertz (THz) regime, realized by gate-tuned ultra-thin reflective metasurfaces based on graphene. A one-port resonator model, backed by our full-wave simulations, reveals the underlying mechanism of our extreme phase modulations, and points to general strategies for the design of tunable photonic devices. As a particular example, we demonstrate a gate-tunable THz polarization modulator based on our graphene metasurface. Our findings pave the road towards exciting photonic applications based on active phase manipulations

Derivation of the green vegetation fraction from TM data of three gorges area

AbstractFraction of green vegetation, fg is needed as one of regular parameters for vegetation cover analysis. The paper explores the potentials of deriving this variable from thermal mapper (TM) normalized difference vegetation index (NDVI) data considering the leaf area index (LAI) of agricultural field. Geometric, radiometric and atmospheric correction of the images were performed before further analysis. According to the sub-pixel structure characteristic, we choose mosaic-pixel model for calculating percent vegetation cover. A new method was put forward to achieve LAI values of non-dense vegetation where soil line equation was considered. Two schemes are produced to obtain different LAI values and type-specific accuracy is evaluated using parameter defined in this paper

A157: The Effect of Whole-Body Vibration Therapy on the Motor Abilities of Patients with Sarcopenia

Purpose: The highly morbid condition known as sarcopenia affects middle-aged and elderly people and is characterized by a progressive loss of whole-body muscle mass accelerated by aging. It is also accompanied by a decline in muscle strength and physiological function. These weakening functions manifest as impaired physical movement, increased risk of falls, disability, lower quality of life, and even death. Sarcopenia is progressively emerging as a new public health issue in China with a quickly aging population, making it vital to investigate effective exercise therapies for sarcopenic patients. Methods: Sixty sarcopenic patients (aged 60-75) from a local hospital in northeast China participated in the study. They were randomly divided into a test group and a control group, with 30 patients in each. The test group underwent a 40-minute whole-body vibration training session for 12 weeks, five times a week, while the control group kept regular routines. Data were collected at the end of the experiment, including muscle strength, muscle mass, muscle function, gait speed, berg balance scale (BBS), five sit-to-stand test (FTSST), activities of daily living (ADL), fall risk assessment scale (FRA), and Sarcopenia Quality of Life Scale (SarQoL) scores. Results: The 12-week whole-body vibration training intervention resulted in a significantly higher value of muscular strength, muscle mass, and muscle function among the test group compared to the control group. The former achieved substantially higher SPPB, ADL, FTSST, and BBS scores than the latter (p \u3c 0.01). With much lower FRA scores and significantly better SarQoL ratings compared to baseline, the test group also significantly outperformed the control group in terms of fall risk and quality of life (p \u3c 0.01). Conclusion: With whole-body vibration training, people with sarcopenia can increase their skeletal muscle strength, considerably enhance their motor function, lower their risk of falls and accidents, and generally improve their quality of life. Whole-body vibration training is worthy of therapeutic use since it is both feasible and practical