纱线在线检测装置

本文介绍了一种新的纱线在线检测装置。该装置设计速度可超过 60 0 m/min,检测的适应性较传统检测装置有了很大的提高。结合试验装置简要介绍该装置的 6大功能 ,并以各种功能为例 ,给出试验结果。1　引　言　　根据纱线的加工工序及成品的特性 ,常需对纱线进行各种测试 ,如纱线的强度、线密度、弹性、毛羽等。传统的方法一般是从纱管或筒子纱中截取一定长度或连续截断纱线 ,测试其断裂强度。虽然也有自动装置测试强度、张力等 ,也能在瞬间内测试到大量数据 ,但这些测试是离线检测 ,且对纱线具有破坏性 ,而且测试速度偏低。本文将介绍一种新…     

The square-root overdetermined recursive instrumental variablealgorithm

A square-root version of the overdetermined recursive instrumental variable (ORIV) algorithm is derived. This version improves the numerical stability of the algorithm, and avoids the problem of positive-definiteness of the inverse covariance matrix. The algorithm uses square-root arrays, and both orthogonal and hyperbolic rotations, as necessitated by the nature of the ORIV algorithm     

An output error method for reduced order controller design

An efficient computational technique is presented for the design of reduced order controllers for linear discrete-time systems. The technique is based on the minimization of the output error between the closed-loop system and a specified reference model.     

The farthest point strategy for progressive image sampling

A new method of farthest point strategy (FPS) for progressive image acquisition-an acquisition process that enables an approximation of the whole image at each sampling stage-is presented. Its main advantage is in retaining its uniformity with the increased density, providing efficient means for sparse image sampling and display. In contrast to previously presented stochastic approaches, the FPS guarantees the uniformity in a deterministic min-max sense. Within this uniformity criterion, the sampling points are irregularly spaced, exhibiting anti-aliasing properties comparable to those characteristic of the best available method (Poisson disk). A straightforward modification of the FPS yields an image-dependent adaptive sampling scheme. An efficient O(N log N) algorithm for both versions is introduced, and several applications of the FPS are discussed.     

A Wire Spark Chamber Spectrometer with a Capacitor Memory and FET Readout

A 20-plane wire chamber spectrometer utilizing capacitors as memory elements and suitable for operation in a magnetic field is described. The (parallel) wire planes are separated by 1 cm. The active areas of the chambers range in size from 120 × 120 cm2 to 200 × 240 cm2. The wire separation is 1 mm. Each readout wire is connected to a separate capacitor resulting in a 30 K-bit memory for the total system. Using FET's as gates, the capacitors are read out in 32 bit words. These words are formatted into data sets of 18 bits/spark and transferred to a PDP-9 computer. Digital processing of data is briefly described, including the computer interface and test procedures. Advantages of this system are discussed together with some performance characteristics.     

Moment transmission by a universal joint

A general theory for calculation of the moments transmitted by an arbitrary universal joint was developed. The theory based on the assumption of a static system with friction, inertia and elastic forces disregarded, was confirmed for two particular cases, the C.V.J. and Hooke's joint. It turns out that a moment component normal to the shaft is unavoidable.     

Degreening and postharvest storage influences 'Star Ruby' grapefruit (Citrus paradisi Macf.) bioactive compounds

Ethylene is commercially used for artificial degreening of early season grapefruits. The present study investigated the effect of degreening and storage period on Star Ruby grapefruit (Citrus paradisi Macf.) bioactive compounds. Freshly harvested grapefruits were degreened in commercial packing shed for 60h using 2ppm of ethylene at a constant temperature of 20°C. Both degreened and non-degreened (control) fruits were stored at 10°C for 21days and later transferred to 20°C for a period of 14days to simulate shipment and retail store market conditions. Bioactive compounds including carotenoids, limonoids, flavonoids and furocoumarins were analyzed using high performance liquid chromatography. Nomilin was significantly higher (P<0.05) in degreened fruits at 35days after storage. In contrast, flavonoids such as narirutin, naringin and poncirin were significantly (P<0.05) lower in degreened fruits at 35days after storage. Degreening treatment reduced the levels of deacetyl nomilinic acid glucoside and bergamottin after 35days of storage; however, it had no significant effect on total soluble solids, decay, fruit softening, taste, odour, ascorbic acid, β-carotene, lycopene, limonin, neohesperidin, didymin, 6,7-dihydroxybergamottin, 5-geranyloxy-7-methoxycoumarin and radical scavenging activity. Therefore, degreening could be utilized to enhance the grapefruit aesthetic quality, with minimal effect on nutritional quality.     

Multi-identity planning process in a studio course: Integrative planning in multi-identity environments

The planning process in a planning studio demonstrates a microcosm of diverse concepts of ideologies and identities seeking acknowledgment and spatial recognition.In the modern world of multiple and dynam icidentities and ideologies,aspiring for the self-recognition of regions, towns, and communities, aplace-based identity has become a core aspect that needs to be taken into planning consideration.The analytic planning method used is iterative of both top–down and bottom–up approaches,thereby creating multi-dimension and coherent planning alternatives where spatial solutions arise from communities along theirc hanging processes.We present two spatialal ternative plans that were developed in the studio course and are based on this line of thinking. Results were very dynamic aspiring complex plans, which are also highly applicable and flexible, thereby addressing a wide range of ideologies and identities.     

ARMA spectral estimation based on partial autocorrelations

This paper presents a new method for estimating the coefficients of autoregressive moving-average parameters of stationary time series. The method is based on computing the sample autocorrelations of the given time series and fitting an ARMA model so as to approximate the partial autocorrelations in a least-squares sense. When the given time series are characterized by spectral zeroes near the unit circle, they tend to have relatively long sequences of nonzero partial autocorrelations; hence the new method is especially effective in such cases. This paper contains a derivation of all necessary mathematical details, as well as several numerical examples illustrating the performance.