New low-loss broadband SAW filter using unidirectional IDTs with U-shaped MSCs

A new low-loss broadband SAW filter is presented. A new configuration using one pair of electrically connected IDTs with an optimum number of fingers, as well as unidirectional IDTs with U-shaped MSCs, is described. Experimental results with bandwidth as wide as 10% and loss as low as 3 dB are achieved. Very accurate computer-aided design of a low-loss filter with MSCs is obtained.     

Spurious response sensitivity of two-way transceivers related to the 3rd-order nonlinearity of SAW filters

The spurious response sensitivities (SRSs) of two-way radio transceivers, as determined from the 3rd-order nonlinearities of SAW filters, are compared using two types of filter, the IIDT-type and a newly-developed SAW-resonator-coupled type, in high-power ( approximately 1 W) applications. The latter type is shown to result in an SRS which satisfies system specifications with sufficient margins.<>     

A direct nanoflow liquid chromatography-tandem mass spectrometry system for interaction proteomics

One of the strategies of functional proteomics, research aiming to discover gene function at the protein level, is the comprehensive analysis of protein-protein interactions related to the functional linkage among proteins and analysis of functional cellular machinery to better understand the basis of cell functions. Here, we describe the direct nanoflow LC (DNLC) system, which is equipped with a fritless high-resolution electrospray interface column packed with 1-microm reversed-phase (RP) beads and a novel splitless nanoflow gradient elution system to operate the column. Using RP-DNLC at an extremely slow flow rate, <50 nL/min, combined with data-dependent collision-induced dissociation tandem MS (MS/MS) and computer-assisted retrieval of spectra, we identified approximately 100 protein components in a biological complex such as a premature mammalian ribosome pull-down from cultured cells when we used an epitope-tagged protein as bait. Because this analysis is most sensitive, requires approximately 0.2 microg of total protein, and is a fully automated 1-h process, we anticipated that it should be an excellent tool for analyzing a limited amount of functional multi-protein complexes in cells.     

Estimation of creep crack growth rate in IN-100 based on the Q* parameter concept

Since the high-strength Ni-based superalloy, cast IN-100, is considered to be brittle at high temperatures, the stable creep crack growth region is limited. Therefore, technically, it is very difficult to perform creep tests and there are few experimental results on the creep crack growth behaviour of this material. We performed creep crack growth tests using Ni-based superalloy, cast IN-100, and derived the Q* parameter for this material, which characterizes the creep crack growth rate. Using this Q* parameter, we derived a law for the creep rupture life of this material.     

Simulation of dispersion of agglomerates in gas phase – acceleration field and impact on cylindrical obstacle

The dispersion of agglomerates by acceleration field and impact onto cylindrical obstacles in gas phase was successfully simulated by the three-dimensional modified discrete element method qualitatively. In case of gas-phase acceleration fields, agglomerates are dispersed into much smaller fragments comparing to the dispersion in liquid-phase shear or elongation flows. The microscopic structure of agglomerates much affects the dispersibility of agglomerates and the agglomerates containing particle of single-point contact with other particles are extremely easy to be dispersed. The impact onto obstacles is more effective dispersion mechanism than acceleration fields, since rigid agglomerates, which cannot be dispersed by acceleration fields, can be dispersed at rather low gas velocity. Although when the gas velocity is very low, agglomerates are only deformed and stuck to the obstacle surface. Then the dispersion becomes significant and size of fragments decreases with the increase in gas velocity.     

Simulation of dispersion and collection process of agglomerated particles in collision with fibers using discrete element method

The behavior of agglomerates in collision with fibers was simulated using the three-dimensional modified discrete element method and the influences of several factors on the fraction of collected particles were examined. Furthermore the single fiber collection efficiency for agglomerated particles was also investigated. In the case where gas velocity is quite low, agglomerates are only deformed but barely dispersed and thus collected as a single deformable particle. By contrast above some critical gas velocity, constituent particles are dispersed and at the same time partly collected on fibers. The fraction of collected particles first increases then decreases as the van der Waals attractive force between particle and fiber increases. The reason for the decrease in fraction of collected particles in strong adhesion region is that the smooth deformation of agglomerates along the fiber surface is inhibited by too strong adhesion. It was also suggested that there exists an optimum size ratio between the agglomerate size and fiber radius for the collection fraction. This is also closely related to the deformation of agglomerate along the fiber surface. In case of non-agglomerated particle collision, all the particles entering within the collision region are collected by fiber. By contrast in case of agglomerate collision, the dispersion of agglomerates as well as collection occurs in the same process and all the particles colliding with the fiber are not necessarily collected. Consequently the single fiber collection efficiency considerably decreases comparing to that for non-agglomerated particle collision.     

HoneyCirculator: distributing credential honeytoken for introspection of web-based attack cycle

A web user who falsely accesses a compromised website is usually redirected to an adversary’s website and is forced to download malware after being exploited. Additionally, the adversary steals the user’s credentials by using information-leaking malware. The adversary may also try to compromise public websites owned by individual users by impersonating the website administrator using the stolen credentials. These compromised websites then become landing sites for drive-by download malware infection. Identifying malicious websites using crawling techniques requires a large amount of resources and time. To monitor the web-based attack cycle for effective detection and prevention, we propose a monitoring system called HoneyCirculator based on a honeytoken, which actively leaks bait credentials and lures adversaries to our decoy server that behaves like a compromised web content management system. To recursively analyze attack phases on the web-based attack cycle, our proposed system involves collecting malware, distributing bait credentials, monitoring fraudulent access, and inspecting compromised web content. It can instantly discover unknown malicious entities without conducting large-scale web crawling because of the direct monitoring behind the compromised web content management system. Our proposed system enables continuous and stable monitoring for about one year. In addition, almost all the malicious websites we discovered had not been previously registered in public blacklists.     

Purification and characterization of an epsilon-poly-L-lysine-degrading enzyme from the epsilon-poly-L-lysine-tolerant Chryseobacterium sp. OJ7

The epsilon-poly-L-lysine-degrading enzyme of the epsilon-poly-L-lysine-tolerant Chryseobacterium sp. OJ7 was purified and characterized. The bacterium excreted the enzyme into the culture filtrate. The purified enzyme has a molecular mass of approximately 38.4 kDa and consists of two identical subunits with a molecular mass of 19.5 kDa. The enzyme catalyzed the endo-type degradation of epsilon-poly-L-lysine. A correlation between the epsilon-poly-L-lysine tolerance of the bacterium and the high epsilon-poly-L-lysine-degrading activity was suggested.     

Sidelobe suppression of s.a.w. resonant filter using twin-turn reflectors

Sidelobe suppression of twin-turn reflector filters is accomplished using longitudinal deformations of i.d.t.s. 41° Y-X LiNbO3 substrate is used, and in experiment the Japanese t.v.i.f. specification is nearly satisfied.