Effect of Ring Density on the Performance in a Tubular Ultrafiltration Membrane Inserted concentrically with a Ring Rod

[[abstract]]The effect of hydraulic behavior on membrane ultrafiltration in a tubular module inserted concentrically with a steel rod wrapped by rings with various ring densities but uniform ring distance along the flow channel, was investigated. It is concluded that attaching rings with proper ring density on the solid rod inserted concentrically in a tubular membrane may enhance the performance of ultrafiltration due to the creation of turbulent flow, resulting in decrease of concentration polarization while still preserving the effective transmembrane pressure.[[notice]]補正完畢[[incitationindex]]SCI[[incitationindex]]EI[[countrycodes]]TW

The Simulation of Read-time Scalable Coherent Interface

Scalable Coherent Interface (SCI, IEEE/ANSI Std 1596-1992) (SCI1, SCI2) is a high performance interconnect for shared memory multiprocessor systems. In this project we investigate an SCI Real Time Protocols (RTSCI1) using Directed Flow Control Symbols. We studied the issues of efficient generation of control symbols, and created a simulation model of the protocol on a ring-based SCI system. This report presents the results of the study. The project has been implemented using SES/Workbench. The details that follow encompass aspects of both SCI and Flow Control Protocols, as well as the effect of realistic client/server processing delay. The report is organized as follows. Section 2 provides a description of the simulation model. Section 3 describes the protocol implementation details. The next three sections of the report elaborate on the workload, results and conclusions. Appended to the report is a description of the tool, SES/Workbench, used in our simulation, and internal details of our implementation of the protocol

A high dynamic-range instrument for SPICA for coronagraphic observation of exoplanets and monitoring of transiting exoplanets

This paper, first, presents introductory reviews of the Space Infrared Telescope for Cosmology and Astrophysics (SPICA) mission and the SPICA Coronagraph Instrument (SCI). SPICA will realize a 3m class telescope cooled to 6K in orbit. The launch of SPICA is planned to take place in FY2018. The SPICA mission provides us with a unique opportunity to make high dynamic-range observations because of its large telescope aperture, high stability, and the capability for making infrared observations from deep space. The SCI is a high dynamic-range instrument proposed for SPICA. The primary objectives for the SCI are the direct coronagraphic detection and spectroscopy of Jovian exoplanets in the infrared region, while the monitoring of transiting planets is another important target owing to the non-coronagraphic mode of the SCI. Then, recent technical progress and ideas in conceptual studies are presented, which can potentially enhance the performance of the instrument: the designs of an integral 1-dimensional binary-shaped pupil mask coronagraph with general darkness constraints, a concentric ring mask considering the obscured pupil for surveying a wide field, and a spectral disperser for simultaneous wide wavelength coverage, and the first results of tests of the toughness of MEMS deformable mirrors for the rocket launch are introduced, together with a description of a passive wavefront correction mirror using no actuator.Comment: 15 pages, 10 figures, 2 table

Orbital Expansion Variational Quantum Eigensolver: Enabling Efficient Simulation of Molecules with Shallow Quantum Circuit

In the noisy-intermediate-scale-quantum era, Variational Quantum Eigensolver (VQE) is a promising method to study ground state properties in quantum chemistry, materials science, and condensed physics. However, general quantum eigensolvers are lack of systematical improvability, and achieve rigorous convergence is generally hard in practice, especially in solving strong-correlated systems. Here, we propose an Orbital Expansion VQE~(OE-VQE) framework to construct an efficient convergence path. The path starts from a highly correlated compact active space and rapidly expands and converges to the ground state, enabling simulating ground states with much shallower quantum circuits. We benchmark the OE-VQE on a series of typical molecules including H$_{6}$-chain, H$_{10}$-ring and N$_2$, and the simulation results show that proposed convergence paths dramatically enhance the performance of general quantum eigensolvers.Comment: Wu et al 2023 Quantum Sci. Techno

The Performance of SCI Memory Hierarchies

This paper presents a simulation-based performance evaluation of a shared-memory multiprocessor using the Scalable Coherent Interface (IEEE 1596). The machines are assembled with one to 16 processors connected in a ring. The multiprocessor's memory hierarchy consists of split primary caches, coherent secondary caches and memory. For a workload of two parallel loops and three thread-based programs, secondary cache latency has the strongest impact on performance. For programs with high miss ratios, 16-node rings exhibit high network congestion whereas 4- and 8-node rings perform better. With these same programs, doubling the processor speed yields between 20 and 70% speed gains with higher gains on the smaller rings. 1 Introduction The Scalable Coherent Interface (SCI) is an IEEE standard for high performance interconnects supporting a physically distributed logically shared memory [18]. SCI consists of physical interfaces, a logical communication protocol, and a distributed ca..

A new UV-curable PU resin obtained through a nonisocyanate process and used as a hydrophilic textile treatment

[[abstract]]A new UV-curable hydrophilic PU resin was obtained through a green, nonisocyanate, three-reaction process: (1) a bis(cyclic carbonate) (BCC) compound is prepared by inserting carbon dioxide into an epoxy resin (DGEBA) at atmospheric pressure; (2) an amino-terminated hydrophilic PU (NH2-PU) oligomer is obtained through the ring-opening polymerization of BCC utilizing a difunctional amino hydrophilic (polyether) compound such as Jeffamine D-2000; (3) the UV-curable acrylate-PU (UV-PU) prepolymer is obtained as an adduct from the Michael addition of NH2-PU to a diacrylate-terminated compound, 3-acryloyloxy-2-hydroxypropyl methacrylate (AHM). A polyester (PET) textile was treated with this hydrophilic UV-PU prepolymer and then cured by irradiation with UV light. The UV-PU resin was found to crosslink and anchor to the textile fibers after UV irradiation, resulting in a long-lasting hydrophilic surface for the treated textile. The performance properties of the new PU resin on the treated textile were investigated.[[incitationindex]]SCI[[booktype]]紙

A new tri-functional azetidine compound for self-curing aqueous-based PU system

[[abstract]]A mono-azetidine compound had been demonstrating a ring opening reaction with carboxylic acid (e.g., trimethylacetic acid, TMAA) and that resulted in an amino ester bond formation at ambient temperature. A triazetidine compound (trimethylolpropane tris(1-azetidinyl)propionate, TMPTA-AZT) was obtained via Michael addition of azetidine (AZT) to trimethylolpropane triacrylate (TMPTA). The carboxylic groups of anionic aqueous-based polyurethanes (PU) served as internal emulsifier, which stabilized PU dispersion and also served as PU curing sites. The triazetidine compound (TMPTA-AZT) was introduced into anionic aqueous-based PU dispersion as a new latent curing agent and that mixture became a single-component self-curable aqueous PU system. A crosslinked PU film was obtained from this PU system on drying at ambient temperature. The final polymer performance properties demonstrated the crosslinking behaviors of this new curing agent, TMPTA-AZT, with carboxylic ion-containing aqueous-based PU resins.[[incitationindex]]SCI[[booktype]]電子

Opposing Pressures of Speed and Efficiency Guide the Evolution of Molecular Machines.

Many biomolecular machines need to be both fast and efficient. How has evolution optimized these machines along the tradeoff between speed and efficiency? We explore this question using optimizable dynamical models along coordinates that are plausible evolutionary degrees of freedom. Data on 11 motors and ion pumps are consistent with the hypothesis that evolution seeks an optimal balance of speed and efficiency, where any further small increase in one of these quantities would come at great expense to the other. For FoF1-ATPases in different species, we also find apparent optimization of the number of subunits in the c-ring, which determines the number of protons pumped per ATP synthesized. Interestingly, these ATPases appear to more optimized for efficiency than for speed, which can be rationalized through their key role as energy transducers in biology. The present modeling shows how the dynamical performance properties of biomolecular motors and pumps may have evolved to suit their corresponding biological actions