Architecture-agnostic dynamic type recovery

2021 ◽  
Author(s):  
Daniel Pekarek ◽  
Hanspeter Mössenböck
Keyword(s):  
Dynamic Type ◽  
Type Recovery

The First Damped Frequency with Maximum Sound Pressure of a Miniature Loudspeaker for Cellular Phones

2010 ◽  
Vol 26 (4) ◽  
pp. 473-482 ◽  
Author(s):  
Y. C. Shiah ◽  
Jin H. Huang ◽  
Y.-L. Xue
Keyword(s):  
Explicit Form ◽  
Sound Pressure Level ◽  
Sound Pressure ◽  
Pressure Level ◽  
Experimental Result ◽  
Cellular Phones ◽  
Explicit Formulation ◽  
Dynamic Type ◽  
Smooth Region

ABSTRACTFor improving the performance of a miniature loudspeaker, engineers have been pursuing a goal of lowering its first damped frequency to have a broad and smooth region of its sound-pressure-level response. This article applies the approach of electro-mechano-acoustical analogy to study the first damped frequency of a miniature loudspeaker used for cellular phones. Using the analogy approach, the authors derive an explicit formulation for the sound-pressure-level of a typical miniature loudspeaker of dynamic type. The veracity of the derived formulation is verified by comparing with the experimental result recorded by B and K apparatus. The derived formulation is further simplified by neglecting factors that are either irrelevant or insignificant for the first damped frequency. Through basic algebraic and calculus operations, this article also presents an explicit form of the first damped frequency. This work has laid the platform for engineers to tailor the design in pursuit of improving the performance of miniature loudspeakers.

Biological feedback for support reaction and changing of its depth in the rehabilitation of patients after radical mastectomy

2020 ◽  
pp. 9-18
Author(s):  
A. V. Deeva ◽  
I. S. Evstigneeva ◽  
M. Yu. Gerasimenko
Keyword(s):  
Cognitive Training ◽  
Radical Mastectomy ◽  
Force Platform ◽  
Medical Rehabilitation ◽  
Younger Patients ◽  
Dynamic Type ◽  
Short Course ◽  
Training Plan ◽  
Support Reaction ◽  
Short Period

Objective. The study deals the influence of different biofeedback (BFB) depth for support reaction on the performance of a short course (3 sessions) for a motor-cognitive training of static and dynamic types in the rehabilitation of patients after a radical mastectomy. Subjects and methods. 21 patients between the ages of 40 and 74 years after radical mastectomy for breast cancer (BC) were examined and performed rehabilitation with the BFB depth for support reaction with a change normal sensitiveness of the force platform by 15, 30, 45 and 60 %. The 1st group included aged 40–54 patients, and the 2nd group included aged 57–74 patients. Results and conclusion. It was found that after 3 courses of the motor-cognitive training of dynamic type (“Lights”), conditionally “younger” patients showed an increase of their results from the fi rst to the third session in all four variants of the changing BFB depth (15, 30, 45, 60 %) from the normal sensitiveness of the force platform. These results weren’t found in dynamics in the 2nd group of patients. Data from static training (“Target”) shows that changing of the BFB depth in the range from 15 to 60 % don’t affect the results of exercises in both groups throughout 3 sessions. These types of training for older patients weren’t as effective as for younger patients over such a short period. Probably, these results of dynamic training depend on multitasking and learning difficulties. The obtained results should be taken into account when a training plan will be drowned up because the incorrect selection of the BFB depth and the short period of medical rehabilitation will reduce the eff ect of training.

Dynamic Type Matching

2021 ◽  
Author(s):  
Ming Hu ◽  
Yun Zhou
Keyword(s):  
Sufficient Conditions ◽  
Sharing Economy ◽  
Problem Definition ◽  
Periodic Review ◽  
Optimal Matching ◽  
Demand And Supply ◽  
Holding Costs ◽  
Current Period ◽  
Dynamic Type ◽  
Managerial Implications

Problem definition: We consider an intermediary’s problem of dynamically matching demand and supply of heterogeneous types in a periodic-review fashion. Specifically, there are two disjoint sets of demand and supply types, and a reward for each possible matching of a demand type and a supply type. In each period, demand and supply of various types arrive in random quantities. The platform decides on the optimal matching policy to maximize the expected total discounted rewards, given that unmatched demand and supply may incur waiting or holding costs, and will be fully or partially carried over to the next period. Academic/practical relevance: The problem is crucial to many intermediaries who manage matchings centrally in a sharing economy. Methodology: We formulate the problem as a dynamic program. We explore the structural properties of the optimal policy and propose heuristic policies. Results: We provide sufficient conditions on matching rewards such that the optimal matching policy follows a priority hierarchy among possible matching pairs. We show that those conditions are satisfied by vertically and unidirectionally horizontally differentiated types, for which quality and distance determine priority, respectively. Managerial implications: The priority property simplifies the matching decision within a period, and the trade-off reduces to a choice between matching in the current period and that in the future. Then the optimal matching policy has a match-down-to structure when considering a specific pair of demand and supply types in the priority hierarchy.

Structural study of the cesium oxypentafluorouranate (VI) CsUOF5

1978 ◽  
Vol 56 (19) ◽  
pp. 2546-2549 ◽  
Author(s):  
Philippe Joubert ◽  
Jean-Marc Weulersse ◽  
Roland Bougon ◽  
Bernard Gaudreau
Keyword(s):  
Neutron Diffraction ◽  
Structural Study ◽  
Characteristic Time ◽  
The Other ◽  
Point Symmetry ◽  
Space Group ◽  
Dynamic Type ◽  
Nmr Study ◽  
Powder Samples ◽  
Occupation Rate

Powder samples of cesium oxypentafluorouranate(VI) were studied by both neutron diffraction and 19F broad Une nuclear magnetic resonance.CsUOF5 crystallises with the [Formula: see text] space group, with the parameters a = 5.41 ± 0.01 Ǻ; α = 95°34′ ± 5′. The structure, which was found to be unchanged at temperatures as low as 4.2 K, was interpreted by a statistical occupation of six-fold equivalents sites, the occupation rate being 1/6 and 5/6 for oxygen and fluorine, respectively. The nmr study showed that the disorder corresponding to this structure was of dynamic type, and that the UOF5− ions were in isotropical rotation. The motion is observable at temperatures as low as 223 K with a characteristic time τ equal to3 × 10-5 s at 266 K. On the other hand, it was also shown through this nmr study that the point symmetry of the UOF5− ion corresponds to the C4v group, with the axial fluorine being more covalent than the equatorial ones. Consistency of the diffraction and nmr results is discussed.

scholarly journals Parameter Research of UAV Vertical Rope-type Recovery System

2018 ◽  
Vol 179 ◽  
pp. 03001
Author(s):  
Chengjing Ma ◽  
Xing'an Liu ◽  
Caiwen Zhang
Keyword(s):  
Simulation Analysis ◽  
Initial Conditions ◽  
Recovery Process ◽  
Resistance Force ◽  
Recovery Method ◽  
Recovery System ◽  
Recovery Performance ◽  
Stiffness And Damping Coefficient ◽  
Stiffness And Damping ◽  
Type Recovery

Vertical rope-type recovery system is a new accurate recovery method for small fixed-wing unmanned aerial vehicles (UAV). This paper models the recovery system and finishes the simulation of recovery process. The recovery stand model of the recovery system is built by analyzing the physical essence, and the aircraft model is based on dynamics and kinematics equations as well as the mechanical characteristics of arresting rope. Finally the simulation analysis of the recovery process is completed. On the basis of the modeling simulation, the system parameters’ effect on recovery performance such as maximum resistance force, maximum overload and maximum radius has been discussed by varying each key parameter. Eventually, the pattern of how initial conditions when hitting the rope as well as the arresting rope’s stiffness and damping coefficient influence recovery performance has been researched, and the result could provide theoretical reference for the design of UAV using vertical rope-type recovery and the system in the future.

Sign in / Sign up

Export Citation Format

Share Document