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排序方式: 共有128条查询结果,搜索用时 274 毫秒
41.
Hoikkala A Mustonen E Saastamoinen I Jokela T Taponen J Saloniemi H Wähälä K 《Molecular nutrition & food research》2007,51(7):782-786
The isoflavonoids, equol, formononetin, daidzein, genistein, biochanin A, and O-demethylangolensin (O-DMA), were analyzed from commercial cartons of skimmed Finnish milk by HPLC-diode array detector (DAD)-FL. We found 411 +/- 65 ng/mL of equol and traces of formononetin and daidzein in organic skimmed milk whereas conventionally produced milk contained 62 +/- 16 ng/mL of equol and no formononetin or daidzein. 相似文献
42.
This paper describes some fault tree optimization algorithms used in STUK PSA code SPSA that is capable of generating minimal cut sets for fault trees containing 12 000 gates and basic events. The complexity of a minimal cut set search is a function of multiple gates and basic events. In a fault tree containing 1000 multiple elements, these optimizations reduce the number of multiple elements often by 30 to 50%. One novel feature of the algorithm is that no boolean reduction rules are used, since the fault tree itself contains its simplification rules. 相似文献
43.
Takayoshi Katahira Ilkka Kartio Hiroshi Segawa Michimasa Takahashi Katsumi Sagisaka 《Microelectronics Reliability》2006,46(5-6):756-762
There are several PWB technologies in the market that enables high density interconnection for product miniaturization, and this paper focuses on two HDI technologies, SSP and FVSS®, and discuss the new PWB technologies and the reliability evaluation results for mobile applications. SSP is manufactured in simple lamination process using conventional FR4 materials, which enables future cost reduction and high reliability. FVSS contains filled buried via hole (BVH) and filled micro blind via (μvia) process. By combining the two process FVSS accomplishes high vertical design capability with Stacked μvia-on-μvia and stacked μvia-on-BVH designs.Key reliability requirements for final product quality is drop and temperature cycling reliability in board level in addition to evaluate PWB specific tests to compare performance of new materials used in PWB. 相似文献
44.
We study the effect of tissue anisotropy in optical tomography of neonates. A Monte Carlo method capable of modeling photon migration in an arbitrary 3D tissue model with spatially varying optical properties and tissue anisotropy is used for simulating measurements of neonates. Anatomical and diffusion tensor magnetic resonance imaging of neonates are used for creating the anatomical models. We find that tissue anisotropy affects the measured signal and the pattern of sensitivity in optical measurements. 相似文献
45.
Uurto I Kotsar A Isotalo T Mikkonen J Martikainen PM Kellomäki M Törmälä P Tammela TL Talja M Salenius JP 《Journal of materials science. Materials in medicine》2007,18(8):1543-1547
Drug-eluting stents are a recent innovation for endovascular and endourethral purposes. The aim of this study was to assess
the biocompatibility of new biodegradable drug-eluting stent materials in vivo. Rods made of SR-PLDLA (self-reinforced poly-96l,4d-lactic acid) covered with P(50l/50d)LA and rods made of 96l/4D SR-PLA and covered with P(50l/50d)LA including indomethacin 3.3 μg/mm2 or dexamethasone 1.5 μg/mm2, were inserted into the dorsal muscles of 20 rabbits serving as test animals. Rods made of silicone and organotin-positive
polyvinylchloride were used as negative and positive controls. The animals were sacrificed after 1 week, 1 month, 2 months
or 4 months. Histological changes attributable to the operative trauma were seen in all specimens at 1 week and 1 month. At
2 months both dexamethasone and indomethacin induced less fibrosis than the plain SR-PLDLA covered with P(50l/50d)LA without drug. At 4 months dexamethasone induced both chronic inflammatory changes and foreign body reaction, whereas the
reactions in the indomethacin and drug-free plain SR-PLDLA groups were insignificant. The new biodegradable drug-eluting stent
materials are highly biocompatible. Drug-eluting biodegradable stents may offer a promising new treatment modality for vascular
and urethral diseases. However, further studies are needed to demonstrate their feasibility and efficacy. 相似文献
46.
Handolin L Partio EK Arnala I Pajarinen J Pätiälä H Rokkanen P 《Journal of materials science. Materials in medicine》2007,18(6):1239-1245
The effects of low-intensity pulsed ultrasound (30 mW/cm2) were investigated in experimental cancellous bone fracture healing in bioabsorbable self-reinforced poly-l-lactide (SR-PLLA) rod fixed distal femur osteotomy in rats. A transverse transcondylar osteotomy was fixed with one SR-PLLA
rod in 32 male Wistar rats of the age of 20 weeks. Half of the rats had a daily 20-min ultrasound exposure for three weeks.
The follow-up times were three, six, and 12 weeks. Radiographical, histological, microradiographical, oxytetracycline labeling,
and histomorphometrical analyses were performed. No foreign-body reactions were noted. The biocompatibility of SR-PLLA and
ultrasound was found to be good. In the radiological and histological assessments there was a slight tendency for enhanced
healing in the ultrasound group at three weeks, but at six and 12 weeks no differences were observed. The histomorphometrical
and oxytetracycline labeling analyses showed that ultrasound exposure had no significant effects on bone healing.
The present study shows that there were no obvious findings to support the hypothesis that low-intensity pulsed ultrasound
enhances bone healing in self-reinforced poly-l-lactide (SR-PLLA) rod fixed experimental metaphyseal distal femur osteotomy in rats. The observed good biocompatibility provides
a safe starting-point for clinical trials on bioabsorbable fixation combined with low-intensity ultrasound. 相似文献
47.
Davood Gudarzi Warin Ratchananusorn Ilkka Turunen Tapio Salmi Markku Heinonen 《Topics in Catalysis》2013,56(9-10):527-539
Activated carbon cloths (ACCs) were used as supports for Pd catalysts. The catalyst preparation was carried out by the impregnation method using acidic solution of palladium dichloride (PdCl2) as metal precursor. The effects of the oxidation state of the loaded metal, heat treatment of the catalysts in different atmosphere (H2, air) at different temperatures and surface chemistry of the support on the catalyst characterizations and the catalytic activities were investigated. Wet oxidation of ACC was done by nitric acid in order to induce oxygen-containing surface functional groups. Surface chemistry of the support and oxidation state of the metallic phase was investigated by means of XPS, TPD, SEM, DTA and TGA tests. Direct synthesis of hydrogen peroxide from H2 and O2 was performed batch wise in a stainless steel autoclave. The reactions were conducted under high pressure (38 bar) at 0 °C and methanol was used as reaction medium. The direct synthesis results showed that the oxygen-containing surface functional groups increase the selectivity of the catalysts by reducing the rate of water production. Existence of the oxidized state of Pd (PdO) also makes the catalyst more selective than the corresponding zerovalent state (Pd0). PdO affected on selectivity by increasing the rate of H2O2 production and reducing the amount of production of water, simultaneously. 相似文献
48.
• | Forecasting changes in business environments is critical for appropriate responses by policy makers and corporate decision makers. This article reports on a Delphi study which features three rounds of interchanges between experts on possible changes in the international business environment and practice in the next years. |
• | Results indicate that terrorism and corruption issues have risen in importance while trade negotiations have declined. Corporate strategies are seen to need significant reform to deliver on the promise of globalization. As trends are becoming more multidimensional, regular solicitation of stakeholder perspectives becomes more important. |
49.
BMC via on-the-fly determinization 总被引:1,自引:0,他引:1
Toni Jussila Keijo Heljanko Ilkka Niemelä 《International Journal on Software Tools for Technology Transfer (STTT)》2005,7(2):89-101
This paper develops novel bounded model checking (BMC) techniques for asynchronous parallel systems. The aim is to increase the efficiency of BMC by exploiting the inherent concurrency in such systems. This added efficiency is gained by covering more reachable states within a given bound using two techniques. Firstly, a nonstandard execution model, step executions, where multiple actions can take place simultaneously is applied. Secondly, the number of executions the system can have is reduced by modeling the execution of the system components as if they were determinized. This determinization technique also enables the removal of the internal transitions of the components. Step executions can be further restricted to a subclass called process executions without losing any reachable states.The paper presents a translation scheme for BMC of reachability properties. The translation is from an asynchronous system where the components are modeled as labeled transition systems (LTSs) to a propositional formula. The models of the formula correspond to the step executions of the original system where each component is replaced with its determinized counterpart. The formula for step executions can be easily extended in such a way that its models correspond to the process executions of the system. The translation scheme has been implemented and some experimental comparisons performed. The results show that the bound needed to detect a violation of a reachability property is, for step and process executions, in most cases lower than in interleaving executions and that the running time of the model checker using process executions is smaller than of that using steps. Moreover, the performance compares favorably to a state-of-the-art interleaving BMC implementation in the NuSMV system. 相似文献
50.
Ilkka Somero Jussi Ollila 《工程机械》2014,(12):I0019-I0019
颚式破碎机的破碎腔体积对破碎效率至关重要。与同规格的上一款机型相比,美卓新推出的NordbergC130型颚式破碎机的破碎腔体积增大21%,一次可破碎更多的矿石;其超大的给料口,可确保在恶劣工况下拥有更高产量。 相似文献