Utilization pattern of fuelwood plants by the Halam community of Tripura,Northeast India

The present study was undertaken to identify the fuelwood plant species and their utilization pattern by the Halam community of Tripura. The main objective of this study was to assess the species preference as fuelwood, the total value index, and the fuelwood value index (FVI) of 22 species. The majority of the households use the plant resources for domestic purpose. Although the community’s mostly preferred fuelwood species were Tectona grandis L.f, Shorea robusta C. F. Gaertn, and Gmelina arborea Roxb, a total of 22 species were reported from the study site. Trewia nudiflora L., Albizia procera Benth., Dysoxylum procerum Hierm., and Cassia siamea Lam. were also reported as fuelwood species with good wood quality (FVI). Thus awareness on the use of these species as fuelwood can be increased in the community to reduce stress on the preferred species and the surrounding forest.     

高电流密度膜极距电解装置运行经验

介绍湖北兴瑞化工有限公司第1期15万t/a离子膜法烧碱装置运行情况.在高电流密度下通过严格控制各项工艺指标及规范操作,可确保该装置长期稳定运行.     

应用BCM模拟软件对石脑油裂解炉进行价值优化

应用BCM模拟软件分析了SRT-Ⅳ(HS)型石脑油裂解炉的操作条件(炉管出口温度(COT)、进料量、稀释蒸汽与原料的质量比(稀释比))对裂解产物总价值的影响,同时研究了裂解产物价格波动对裂解产物总价值的影响。计算结果表明,石脑油裂解产物总价值分别随COT的升高和稀释比的增大出现局部极大值,并与进料量呈线性关系;当裂解产物价格发生变化时,裂解产物总价值及其达到最大时对应的COT也随之变化;当某一裂解产物的价格高于其他裂解产物价格两个数量级时,该裂解产物的收率与裂解产物总价值的变化规律相同。石脑油裂解炉的裂解产物总价值优化结果与裂解产物收率优化结果存在差异,应用BCM模拟软件对工业裂解炉实施价值优化,有利于提高工业裂解炉裂解产物的总价值。     

七种典型装饰材料的静态生烟特性

通过塑料烟密度仪和热重分析仪(TGA)研究了7种典型装饰材料的热分解特性和静态生烟性。结果表明:辐射功率越大,样品的比光密度和质量光密度越大;在相同的辐射功率下,有焰时的比光密度和质量光密度要明显小于无焰时的;材质相同时比光密度和质量光密度随着样品厚度的增加而减少。对比TGA实验结果可知,烟密度实验中的质量损失率正比于TGA的热失重率,即材料的热重失重率大,烟密度实验中的质量损失率也大。     

海相页岩TOC地震定量预测技术及其应用——以四川盆地焦石坝地区为例

总有机碳含量(TOC)是评价页岩生烃能力和页岩油气藏的一个重要指标,目前国内外利用地震资料直接定量预测TOC的报道很少,因此,有必要对地震预测TOC的方法作进一步的研究。为此,以四川盆地焦石坝地区为例,从岩心实测TOC出发,通过TOC与地球物理参数交会分析,寻找到TOC敏感地球物理参数——密度,并建立密度与TOC之间的最佳拟合方程,得到计算总有机碳含量的经验公式;结合叠前地震反演获得的密度体便可计算出TOC数据体,从而达到定量预测页岩TOC的目的。将改进的预测方法应用于四川盆地焦石坝地区海相页岩气勘探,结果表明:①利用叠前同时反演直接求得的密度体避免了累计误差,稳定性好,多解性少,结果可靠,为精细定量预测TOC提供了基础保证;②预测的TOC与实测结果吻合程度高,相对误差较小。结论认为,该技术在四川盆地海相页岩气勘探中具有广阔的应用前景。     

LDPE装置循环水节约实例研究

文中详细介绍了在高压低密度聚乙烯（LDPE）装置中用热水罐外排污水替代紧急放空塔循环水溢流的做法,探索了节水降耗、清洁生产的经验。     

A novel method of blind signal detection using the distribution of the bin values of the power spectrum density and the moving average

Signal detection in additive white Gaussian noise (AWGN) is one of the long-term developments driving the evolution of many different fields of science and technology, with important applications in telecommunications, medicine and astronomy. In this paper, we propose a novel method of blind signal detection that does not require knowledge of the noise variance. This method uses the distribution of the bin values of the power spectrum density of the received signal and the moving average (MAV). The simulation results for radio pulses show that the spectrum sensing performance is significantly improved under the proposed scheme compared to that of known blind signal detection methods.     

Energetic distribution of interface states extracted from photo-conductance of organic thin film transistors

In this paper, a new method is introduced to obtain the energetic distribution of the interface states (density of states; DOS) extracted from the photo-conductance of organic thin film transistors (OTFTs) which exhibit varied transfer characteristics under illumination with different photon energies. The method was applied to pentacene OTFTs, and the results were compared with existing data. The major findings were not only the existence of the well-known peaks of DOS at 1.82 eV (free exciton of pentacene), and at 1.49 eV (extrinsic exciton due to dihydropentacene) but also new peaks were found at 1.25 eV, 1.29 eV, 1.31 eV, and 1.35 eV in the mid-gap. The new peaks were strongly enhanced under exposure to oxygen, and thus seem to be related to the defects associated with the presence of oxygen.     

建筑设计对工程造价的影响分析

总结建筑设计与工程造价的关系,从投资控制视角阐述结构设计管理措施,并以某住宅楼为实例,应用价值工程计算分析砖混、矩形柱框架及异形柱框架三种结构形式造价成本的经济性。最后得出结论:建筑设计在考虑工程的安全性、可靠性的同时,还需考虑工程造价,以最小的成本实现设计目标的必要功能。