Study on early warning index of spatial deformation for high concrete dam

Owing to the deficiency in early warning for high concrete dam,a formula was established to characterize the deformation behavior of high concrete dam as a whole.The early warning index of spatial deformation was calculated by low probability principle on the basis of the deformation entropy formula proposed.The steps were as follows.Firstly,the probability method was utilized to define the degree of order and degree of chaos for each survey point.Secondly,the weight distribution among the survey points was...     

Certain classes of meromorphic multivalent functions

In this paper, we introduce and investigate two new classes of meromorphic multivalent functions. Such results as subordination properties, coefficient inequalities, convolution properties and integral representations are proved. Several sufficient conditions for meromorphic multivalent starlikeness and convexity are also derived.     

Role of dual SiOx: H based buffer at the p/i interface on the performance of single junction microcrystalline solar cells

In p-i-n structure a-Si solar cell a buffer layer with proper characteristics plays important role in improving the p/i interface of the cell, reducing mismatch of band gaps and number of recombination centres. However for p-i-n structure microcrystalline ( µc-Si: H) cell which has much less light induced degradation than a-Si:H cell, not much work has been done on development of proper buffer layer and its application to µc-Si:H cell. In this paper we have reported the development of two intrinsic oxide based microcrystalline layer having different characteristics for use as buffer layers at the p/i interface of µc-Si:H cell. Previously SiO_x:H buffer layer has been used at the p/i interface which showed positive effects. To explore the possibility of improving the performance of p-i-n structure µc-Si:H cell further we have thought it interesting to use two buffer layers with different characteristics at the p/i interface. The two buffer layers have been characterized in detail and applied at the p/i interface of the µc-Si:H cell with positive effects on all the PV parameters mainly improves the open circuit voltage (V_oc) and enhances short circuit current (I_sc). The maximum initial efficiency obtained is 8.97% with dual buffer which is 6.7% higher than that obtained by using conventional single buffer layer at the p/i interface. Stabilized efficiency of the cell with dual buffer is found to be ~9.5% higher than that with single buffer after 600 h of light soakings.     

The design of spin filter junction in zigzag graphene nanoribbons with asymmetric edge hydrogenation

Using the non-equilibrium Green’s function method combined with the density functional theory, we investigate the electronic transport properties of a heterostructure based on zigzag graphene, This heterostructure consists of H2–NZGNR–H and H–NZGNR–H. Results show that a perfect dual spin filtering effect can be realized with the parallel (P) and antiparallel (AP) magnetiesm configuration, and some magnetic domain walls (DW) at the interface between two component ribbons. The magnetic moments, DOS and PDOS, the transmission pathways and LDOS demonstrate that the edge of C–H2 bonds have important effects for magnetic and spin dependent transport properties compared to the edge of C–H bonds. Our results show that the H2–ZGNR–H/H–NZGNR–H heterostructure holds promise for magneto electronics devices which can keep steady properties when change the widths of the two component ribbons.     

A 1 V, 0.53 ns, 59 μW Current Comparator Using Standard 0.18 μm CMOS Technology

Wireless Personal Communications - This letter aim to propose a current comparator based on simple current mirror which use single amplifier to reduce input offset, the improving symmetry current...     

马尾松溶解浆的预水解硫酸盐法制浆

对制备马尾松溶解浆的预水解硫酸盐制浆工艺进行研究。实验结果表明:预水解硫酸盐纸浆的卡伯值随着预水解P因子的增加先降低后升高,聚戊糖含量不断降低,预水解P因子为700时聚戊糖含量低于3%;硫酸盐法蒸煮最佳用碱量为22%,硫化度为25%~30%,H因子为1500~1600;与普通硫酸盐马尾松浆比较,预水解硫酸盐浆的卡伯值、黏度及细浆得率低。     

桉木低固形物连续蒸煮工艺研究

以桉木为原料,模拟低固形物连续蒸煮,结合工厂实际(目标卡伯值16～18,残碱6～8g·L-1),对桉木低固形物连续蒸煮工艺参数进行优化,研究表明实验室模拟低固形物连续蒸煮最佳工艺条件为:木片汽蒸时间30min,分段加碱比例55:45,蒸煮最佳用碱量21%(NaOH计),上抽提温度135℃,H因子1200～1300,在此条件下能够获得较好指标的纸浆。     

备料系统树皮中短小原木的回收工艺

为了回收原木剥皮后树皮中夹杂的短小木材,设计了一套采用原木回收机的工艺方案。通过在削片生产线中的实际使用,发现原木回收机回收木材的效率很高,且对长度越长的木材回收效率越高。此方案的运用提高了木材利用率,减少了木材对下一道工序中树皮粉碎机的损坏风险,具有较高的推广和应用价值。