全自动纤维帘布裁断机的导开与储布自控设计

帘布裁断机是橡胶子午胎生产的主要设备之一.它的功能是将宽约1500mm的帘布按一定的角度、一定的定长裁断,然后以裁断定长为宽,沿帘布边线方向对接,供成型工艺用.

合成革储布机设计

合成革储布机主要是为了纺织业生产的储布过程而设计。通过对机架的设计、导布辊的设计,机械传动装置的设计、气动装置的设计,PLC控制的设计,使其保护合成革的质量和提高收卷效率,在产品试制、实验分析、设备改进设计等方面具有重要的实际应用和推广价值。

智能化后整理联机设备——自动可调节储布槽

可调节可调节储布槽是一种集联机同步和储布功能于一体的机器。通过角位移的变化来控制后台设备的织物运行速度,由此实现同步的目的。

纺织机械中储布机储布性能分析

针对纺织机械中储布机的工作原理与特点,参照电路暂态分析方法建立与其线性系统模型相同的电路线性系统,采用电路暂态分析方法分析了储布机的储布性能,给出了确定影响储布机储布性能的各参数的方法。分析过程与结果表明,此分析方法合理可行。

溢流染色机储布槽结构设计与分析

本文针对针织物溢流染色要求织物在储布槽中运行顺畅、摩擦小等特点,对比分析了各种储布槽结构特点,提出了J型储布槽的设计结构方案,建立了圆弧与直线耦合的J型结构储布槽几何模型。对坯布在J型储布槽中的运行过程进行了分析计算,得出J型储布槽底部应该采用圆弧形状,即J型储布槽出布口倾斜角度的最佳值为0°的结构设计依据。通过在储布槽底部增设导布底板等措施,可以减小坯布与储布槽之间的摩擦,使坯布运行更加顺畅。增加适当的快速回流槽可提高染液的回流效率。

基于CFD的溢流染色机J形储布槽流场分析

建立溢流染色机的数字样机,借助计算流体动力学仿真软件,针对J形储布槽进行流场模拟仿真分析。结果表明:J形储布槽入口压强、流速分布较为均匀稳定;折弯处上边沿压强低、流速快、温度较低,下边沿压强高、流速低、温度较高,同时为溢流染色机的J形储布槽结构设计及优化提供理论参考。

储布架活动框架掉落原因分析及改进措施

为解决轮胎压延生产线储布架的活动框架经常掉落之问题,双喜轮胎公司从储布装置的结构上找原因,发现起调压及安全泄压作用的溢流阀是问题的关键。需在液压系统中增添一个起安全阀作用的电磁溢流阀,使调压与泄压的操作分开,加强严格管理,从而彻底解决了困扰已久的难题。

压延机储布装置浮动架位置控制系统

论文主要介绍储布装置浮动架位置控制系统在橡胶四辊压延线的导开处帘子布接头时和制品卷取处换卷时保证全线连续生产并且产量效率平稳的一种方案。

四辊压延机储布液压站的自动控制系统与维护

针对传统四辊压延机的储布液压站系统定速不足的基础之上,将变频电机应用在储布液压站上,重点介绍了储布液压站的结构和工作原理,利用电气控制系统对储布电机进行电气控制。根据控制流程编写PLC程序,在保持压力恒定的基础之上有效的在PLC系统中对储布部分的速度进行控制。验证了利用变频电机的可行性;为橡胶行业的机械设备压延机生产线的储布液压系统提供了理论依据,从而提高了储布控制精度和稳定性,并且节约了能源,减少滑油损耗。

Wigner-Ville distribution and its application in seismic attenuation estimation

The attenuation of seismic signals is often characterized in the frequency domain using statistical measures of the power spectrum. However, the conventional Fourier transform-based power spectrum estimation methods suffer from time-frequency resolution problems. Wigner-Ville distribution, which is a member of Cohen class time-frequency distributions, possesses many appealing properties, such as time-frequency marginal distribution, time-frequency localization, etc. Therefore, Wigner-Ville distribution offers a new way for estimating the attenuation of seismic signals. This paper initially gives a brief introduction to Wigner-Ville distribution and the smoothed Wigner-Ville distribution that is effective in reducing the cross-term effect, and then presents a method for seismic attenuation estimation based on the instantaneous energy spectrum of the Wigner-Ville distribution. A real data example from central Tarim Basin in western China is presented to illustrate the effectiveness of the proposed method. The results show that the Wigner-Ville distribution-based seismic attenuation estimation method can effectively detect the difference between reef, shoal and lagoon facies by their attenuation properties, indicating that the estimated seismic attenuation can be used for reef and shoal carbonate reservoir characterization.

Spatial pattern of soil carbon and nutrient storage at the Alpine tun-dra ecosystem of Changbai Mountain, China

In August 2003, we investigated spatial pattern in soil carbon and nutrients in the Alpine tundra of Changbai Moun-tain, Jilin Province, China. The analytical results showed that the soil C concentrations at different depths were significantly (p<0.05) higher in Meadow alpine tundra vegetation than that in other vegetation types; the soil C (including inorganic carbon) concentrations at layer below 10 cm are significantly (p<0.05) higher than at layer of 1020 cm among the different vegetation types; the spatial distribution of soil N concentration at top surface of 0-10 cm depth was similar to that at 1020 cm; the soil P concentrations at different depths were significantly (p<0.05) lower at Lithic alpine tundra vegetation than that at other vegetation types; soil K concentration was significantly (p<0.05) higher in Felsenmeer alpine tundra vegetation and Lithic alpine tundra vegetation than that in Typical alpine tundra, Meadow alpine tundra, and Swamp alpine tundra vegetations.. However, the soil K had not significant change at different soil depths of each vegetation type. Soil S concentration was dramatically higher in Meadow alpine tundra vegetation than that in other vegetation types. For each vegetation type, the ratios of C: N, C: P, C: K and C: S generally decreased with soil depth. The ratio of C: N was significantly higher at 010 cm than that at 1020 cm for all vegetation types except at the top layer of the Swamp alpine tundra vegetation. Our study showed that soil C and nutrients storage were significantly spatial heterogeneity.

AS/RS based yard and yard planning

In this paper, we apply the split-platform automated storage/retrieval systems (SP-AS/RSs) (Hu et al., 2005) to store containers in the yard to improve the yard performance and to increase the utilization of the yard space. The layout of an SP-AS/RS based yard is described in detail. To achieve an efficient operation, we present a novel yard space allocation policy called the ‘second-carrier-based allocation policy’, which can help to alleviate the out-of-sequence problem of containers and the congestion of vehicles at the AS/RS racks. Different allocation policies are compared by an integrated container terminal simulation system. The simulation results show that the second-carrier-based policy is very efficient and has the potential to offer high terminal performance.

Invited Paper: The Audacity of Fiber-Wireless(FiWi) Networks: Revisited for Clouds and Cloudlets

There is a growing awareness among industry players of reaping the benefits of mobile-cloud convergence by extending today's unmodified cloud to a decentralized two-level cloud-cloudlet architecture based on emerging mobile-edge computing(MEC) capabilities. In light of future 5G mobile networks moving toward decentralization based on cloudlets, intelligent base stations, and MEC, the inherent distributed processing and storage capabilities of radio-and-fiber(R&F) networks may be exploited for new applications, e.g., cognitive assistance, augmented reality, or cloud robotics. In this paper, we first revisit fiber-wireless(Fi Wi) networks in the context of conventional clouds and emerging cloudlets, thereby highlighting the limitations of conventional radio-overfiber(Ro F) networks such as China Mobile's centralized cloud radio access network(C-RAN) to meet the aforementioned trends. Furthermore, we pay close attention to the specific design challenges of data center networks and revisit our switchless arrayedwaveguide grating(AWG) based network with efficient support of east-west flows and enhanced scalability.

Tree-Structured Parallel Regeneration for Multiple Data Losses in Distributed Storage Systems Based on Erasure Codes

To reduce the time required to complete the regeneration process of erasure codes, we propose a Tree-structured Parallel Regeneration (TPR) scheme for multiple data losses in distributed storage systems. Under the scheme, two algorithms are proposed for the construction of multiple regeneration trees, namely the edge-disjoint algorithm and edge-sharing algorithm. The edge-disjoint algorithm constructs multiple independent trees, and is simple and appropriate for environments where newcomers and their providers are distributed over a large area and have few intersections. The edge-sharing algorithm constructs multiple trees that compete to utilize the bandwidth, and make a better utilization of the bandwidth, although it needs to measure the available band-width and deal with the bandwidth changes; it is therefore difficult to implement in practical systems. The parallel regeneration for multiple data losses of TPR primarily includes two optimizations: firstly, transferring the data through the bandwidth optimized-paths in a pipe-line manner; secondly, executing data regeneration over multiple trees in parallel. To evaluate the proposal, we implement an event-based simulator and make a detailed comparison with some popular regeneration methods. The quantitative comparison results show that the use of TPR employing either the edge-disjoint algorithm or edge-sharing algorithm reduces the regeneration time significantly.

An Improved Charge Pumping Method to Study Distribution of Trapped Charges in SONOS Memory

In silicon-oxide-nitride-oxide-silicon （SONOS） memory and other charge trapping memories, the charge distribution after programming operation has great impact on the devic＇s characteristics,such as reading,programming/erasing, and reliability. The lateral distribution of injected charges can be measured precisely using the charge pumping method. To improve the precision of the actual measurement, a combination of a constant low voltage method and a constant high voltage method is introduced during the charge pumping testing of the drain side and the source side, respectively. Finally, the electron distribution after channel hot electron programming in SONOS memory is obtained,which is close to the drain side with a width of about 50nm.

Classification of tight sandstone reservoirs based on NMR logging

The traditional reservoir classification methods based on conventional well logging are inefficient for determining the properties,such as the porosity,shale volume,J function,and flow zone index,of the tight sandstone reservoirs because of their complex pore structure and large heterogeneity.Specifically,the method that is commonly used to characterize the reservoir pore structure is dependent on the nuclear magnetic resonance(NMR)transverse relaxation time(T2)distribution,which is closely related to the pore size distribution.Further,the pore structure parameters(displacement pressure,maximum pore-throat radius,and median pore-throat radius)can be determined and applied to reservoir classification based on the empirical linear or power function obtained from the NMR T2 distributions and the mercury intrusion capillary pressure ourves.However,the effective generalization of these empirical functions is difficult because they differ according to the region and are limited by the representative samples of different regions.A lognormal distribution is commonly used to describe the pore size and particle size distributions of the rock and quantitatively characterize the reservoir pore structure based on the volume,mean radius,and standard deviation of the small and large pores.In this study,we obtain six parameters(the volume,mean radius,and standard deviation of the small and large pores)that represent the characteristics of pore distribution and rock heterogeneity,calculate the total porosity via NMR logging,and classify the reservoirs via cluster analysis by adopting a bimodal lognormal distribution to fit the NMR T2 spectrum.Finally,based on the data obtained from the core tests and the NMR logs,the proposed method,which is readily applicable,can effectively classify the tight sandstone reservoirs.

Performance Analysis and Framework Optimization of Open Source Cloud Storage System

More and more embedded devices, such as mobile phones, tablet PCs and laptops, are used in every field, so huge files need to be stored or backed up into cloud storage. Optimizing the performance of cloud storage is very important for Internet development. This paper presents the performance evaluation of the open source distributed storage system, a highly available, distributed, eventually consistent object/blob store from Open Stack cloud computing components. This paper mainly focuses on the mechanism of cloud storage as well as the optimization methods to process different sized files. This work provides two major contributions through comprehensive performance evaluations. First, it provides different configurations for Open Stack Swift system and an analysis of how every component affects the performance. Second, it presents the detailed optimization methods to improve the performance in processing different sized files. The experimental results show that our method improves the performance and the structure. We give the methods to optimize the object-based cloud storage system to deploy the readily available storage system.

Carbon storage of bamboo forest ecosystem in China

National forest inventory materials and data from China Forest Ecosystem Location Research Network （CFERN） were obtained for estimating four periods of carbon storage of Bamboo forest ecosystem from 1977 to 2003 in China. The spatial and temporal patterns, vertical distribution and potential carbon storage of the bamboo forest ecosystem were analyzed. The results showed that carbon storage of Chinese bamboo forest ecosystem was 537.6 Mt C during 1977 and 1981, 598.61 Mt C during 1984 and 1988, 710.14 Mt C during 1994 and 1998, and 837.92 Mt C during 1999 and 2003. It showed that the carbon storage was increasing during that time. Zhejiang, Jiangxi, Fujian, Hunan, Guangdong and Sichuan were the major carbon pools in China, with the percentages of carbon storage between 80.04 and 83.13 percent in all. The percentages of carbon storage of vegetation, litter, and soil were between 23.85 and 24.48 percent, between 0.92 and 0.96 percent, and between 74.56 and 75.23 percent respectively. Therefore, it is concluded that the carbon storage in different layers were similar vertically. Carbon storage was 837.92 Mt C from 1999 to 2003, and it will be increased to 947.54 Mt C after one age period with a rate of 54.81Mt carbons stored in ecosystem every year.