An orthogonally persistent system maintains data beyond any program execution. The principle of persistence identification implies that persistence by reachability be used to determine which objects are to be maintained in the store. A particular execution may cause objects to become unreachable—garbage. Any efficient implementation of a persistent system must incorporate a garbage collector to...

Mobile crowdsensing systems employ crowd smartphones to collect data using these device-embedded sensors. The increase in the number of users and volume has limited possibility cellular networks. In this regard, collector need be able send their publishers with less delay device-to-device (D2D) communication. This paper proposes an incentive mechanism for improving transmission rate multiple mo...

Mobile networks pose new issues in the field of distributed garbage collection. Garbage collection must deal with volatile connections that may break remote object references unexpectedly for an unpredictable amount of time. As a result, no automatic distributed garbage collection satisfies the new hardware phenomena. A semantic-based approach called semi-automatic garbage collection is propose...

In view of the incomplete signal and other issues brought by the threshold trigger in the conventional blast wave signal test, this paper designed a post-trigger data high-speed collection method, adopted the ARM7 kernel MCU to complete the design of the hardware scheme and preparation of the corresponding test software, then developed the posttrigger data high-speed collector prototype, and co...

In this paper, we propose a framework to administrate privacy policies in distributed service infrastructure. We define new administrative capabilities that model user preferences and specify how data owners can access to them. We investigate a distributed administration of the privacy policy where three different administrative policies can coexist and one can dominate the other. We define the...

This paper describes the modeling of the resonant-tunneling hot-electron transistor (RHET). In the analysis of the resonanttunneling harrier, we solved the Schrodinger and the Poisson equations self-consistently. We simulated the electron transport in the base and the collector barrier region using the Monte Carlo method, taking account of the space charge in the collector barrier. Our model in...

This experimental study is intended to explore the heat performance of a novel vacuum tube heat collector with thermal storage. In order to enhance the heat transfer performance, we add radial metal fins to the U-tube which is used as the heat transfer channel of water. Meanwhile, in order to increase the thermal capacity of the heat collector, the heat collector model is designed to be larger ...

One of the effective methods to improve the thermal efficiency of solar collectors is using nanofluids as the coolant. The present study experimentally investigated the effect of SiO2/water nanofluid with 1% mass fraction on the performance of a symmetric collector, i.e. conical solar collector. The conical solar collector with 1 m2 area and normal to the earth was tested in Ahvaz, a city in th...

The use of mobile sensors is of great relevance tomonitor critical areas where sensors cannot be deployedmanually. The presence of data collector sinks causes increased energy depletion in their proximity, due to the higher relay load under multi-hop communication schemes (sink-hole phenomenon). We propose a new approach towards the solution of this problem by means of an autonomous deployment ...

In this work, adsorption of the potassium amyl xanthate collector on the pure chalcopyrite surface was studied by applying atomic force microscopy (AFM). The adsorption experiments were carried out at different concentrations of the collector and at diverse pH values in the presence or absence of exterior ions. The changes occurring in the surface morphology of chalcopyrite due to the collector...