To prevent the proliferation of space debris and stabilize environment, active removal (ADR) has increasingly gained public concern. Considering complexity operations viability ADR missions, it would be necessary to schedule process in order remove as much possible. This paper presents an mission planning problem, devoted generate optimal plan guide process. According problem characteristics, a two-layer time-dependent traveling salesman problem(TSP) mathematical model is established,...

In mammals, oocytes within the primordial follicles require a number of essential factors to maintain their survival. However, survival for activated have been poorly characterized. Recently we reported that damaged DNA binding protein-1 (DDB1), linker subunit cullin ring-finger ubiquitin E3 ligase-4 (CRL4) complex, and its substrate adaptor, DDB1-CUL4 associated factor-1 (DCAF1), were follicle maintenance. this study specifically deleted these in growing follicles, investigate if DDB1 DCAF1...

Abstract Background Best surgical of recurrent anterior shoulder instability remained controversial. We knew little about the superiority and choice between traditional open modern arthroscopic techniques. hypothesized that outcomes all patients will be similar regardless technique. Methods A retrospective case-cohort analysis 168 who had was conducted from September 2010 to December 2013. All cases (mean age 30.8 [range 18–50] years) were performed with Bankart repair (33 males/20 females),...

We wondered whether the third-generation gamma nail-3 (GN-3) was better for junior surgeons to learn treat geriatric intertrochanteric femur fractures than proximal femoral nail antirotation-II (PFNA-II). This is a prospective randomised study of 350 patients who underwent GN-3 fixation and PFNA-II carried out by orthopaedic trauma from January 2011 February 2017. compared positioning, complication rates, operative fluoroscopy time, blood transfused, time mobilisation, hospital stay,...

Levels in $^{184}\mathrm{Pt}$ were studied from the decay of mass-separated $^{184}\mathrm{Au}$ by gamma-ray and conversion-electron spectroscopy angular distributions low-temperature nuclear orientation. In addition to coexisting ${\mathit{K}}^{\mathrm{\ensuremath{\pi}}}$=${0}^{+}$ bands, ${\mathit{K}}^{\mathrm{\ensuremath{\pi}}}$=${2}^{+}$ bands are observed at low energy. String interband electric monopole transitions between states two also bands. The coexistence energy represents a new...

Abstract The geometric error determines the product quality and function to a certain extent. Among them, roundness is one of important indicators for evaluating shaft parts. With increase industrial requirements, there are higher requirements accuracy efficiency evaluation. However, most traditional evaluation models used in industry can no longer meet needs current processing terms accuracy. This paper proposes new method based on twin support vector machines (TWSVMs). First, according...

The complexity of composite grinding movement, the variety machining features and available wheels, changing working conditions pose a challenge to rapid programming safe efficient procedure. procedure optimisation plays an important role in solving this difficult problem. Therefore, method is proposed for based on Digital Twin (DT) system, which takes time as objective achieve high efficiency ensures process rationality safety by constructing corresponding constraint conditions. Moreover,...

Reconfigurable intelligent surface (RIS) has become one of the key technologies for sixth-generation (6G) communication systems due to its advantages being programmable, low energy consumption, and easy deployment. In this paper, a novel RIS-assisted deterministic channel model is proposed based on ray tracing (RT). The multipath components (MPCs) in wireless propagation environment are divided into two types, i.e. MPCs with without interaction RIS. Multipath information those types obtained...

The interferometer is the traditional instrument used to find direction of an emitter by measuring phase difference arrival its RF emissions. Bearings-only motion analysis indicates that observer with these measurements can locate position in a period time. A novel passive location method introduced and rate mounted on moving observer. accuracy system analysed. results show significantly improved performance compared method.

SlapOS is an open source operating system for distributed cloud computing based on the motto "everything a process". combines grid and Enterprise Resource Planning (ERP) to provide Infrastructure as Service (IaaS), Platform (PaaS) Software (SaaS) through simple, unified API which one can learn in matter of minutes. opens new perspectives research area resilience security Cloud. In this paper we address question lack resiliency at current IaaS providers show how combination simple leader...

In this paper, a digital predistorted inverse class-F GaN power amplifier with novel PAPR reduction technique, in which not only peaks but also valleys of signal are clipped to reduce the as much possible, is presented. The PA implemented by using Cree's CGH40010 HEMT 10W output power. Measurement results show that ACPR proposed decreases from -35.4dBc -51.9dBc for wideband OFDM 20MHz bandwidth and 8dB after reduction. Drain efficiency 31.3% at an average 33.6dBm.

High voltage and low current power signals are required by a number of applications (i.e. electrostatic/polymer actuators, reconfigurable antennas etc.) for their proper operation. These devices need more than hundred volts is in the range tens μA to few mA. The charge pump boost circuit two potential converters which can provide this power. In work multistage converter, capable 5V-400V (DC-DC) conversion, designed 1 μm SOI process (xdh10). Pros & Cons these discussed performance compared...

As a potential development direction of future transportation, the vacuum tube ultra-high-speed train (UHST) wireless communication systems have newly different channel characteristics from existing high-speed (HST) scenarios. In this paper, three-dimensional non-stationary millimeter wave (mmWave) geometry-based stochastic model (GBSM) is proposed to investigate UHST channels in scenarios, taking into account waveguide effect and impact wall roughness on channel. Then, based model, some...

As a promising key technology for the sixth generation (6G) wireless communication systems, reconfigurable intelligent surface (RIS) is able to intelligently control propagation environments. In order investigate properties of RIS-assisted channels, related channel measurements are necessary. However, parameter estimation (CPE) work in challenging since RIS can only tune part channel. this paper, we present novel sounding procedure firstly where channels observed through different...

This paper presents a multi-objective satellite scheduling problem for very large areal observation in response to various requests. The objectives are maximize the total profits of generated schedule and high efficiency utilization simultaneously. To address problem, we first demonstrate detailed description then transform into set covering within several criteria constraints. Based on that, mathematical model is established. solve new three-phase solving framework proposed. In discretizing...

Aiming for the sixth generation (6G) wireless communications, distributed massive multiple-input multiple-output (MIMO) systems hold significant potential spatial multiplexing. In order to evaluate ability of a MIMO system spatially separate closely spaced users, this paper presents an indoor channel measurement campaign. The measurements are carried out at carrier frequency 5.6 GHz with bandwidth 400 MHz, employing antenna arrays total 128 elements. Multiple scalar metrics selected...

This paper presents a monitoring framework that infers the level of autonomous vehicle (AV) collision risk based on its object detector's performance using only monocular camera images. Essentially, takes two sets predictions produced by different algorithms and associates their inconsistencies with via fuzzy inference. The first set is obtained through retrieving safety-critical 2.5D objects from depth map, second comes AV's 3D detector. We experimentally validate that,...