强化传热技术在挤出机温控系统中的应用

首先详细阐述了温度控制在挤出加工过程中的重要性，然后对挤出机的传热过程进行了系统的分析，由此确定了强化传热技术在挤出机温控系统中的切入点，然后对当前几种强化传热结构机筒的换热能力进行综合评估比较，本项评估比较以精确数值计算为蓝本，为新型机筒流道结构设计提供了很强的参考价值。     

气化炉锥底砖、激冷环与下降筒的损毁与解决对策

针对国产化大氮肥水煤浆气化炉中锥底砖、激冷环和下降筒使用过程中出现的问题,分析了损毁原因,分别从技术改进、工艺操作和设备管理等方面提出了相应的解决对策,可以不同程度地延长锥底砖、激冷环、下降筒的寿命。     

硼泥陶粒及其混凝土的试验研究

介绍用工业废渣硼泥作主要原料，掺一定比例的膨胀剂，生产轻质、高强、保温的硼泥陶粒及配制LC30硼泥陶粒混凝土的试验。     

15%伏草星颗粒剂高效液相色谱测定

本文用反相液相色谱法，以甲醇：酸性水（７５：２５）作为流动相，采用ＯＤＳ－Ｃ１８色谱柱，成功地测定了伏草星除草颗粒剂中有效成分含量。     

PP-R管材料熔融挤出过程MFR控制研究

分析了PP-R（无规共聚聚丙烯）管材料MFR（熔体流动速率）的变化对力学性能的影响，着重通过双螺杆挤出机研究了PP—R管材料熔融挤出过程中影响MFR变化的因素。结果表明，合适的加工工艺控制和优良的抗氧体系是保证PP-R管材料加工过程中MFR稳定的前提。     

三种骨灰瓷原料的制备与晶相结构

本实验采用牛、猪、羊三种骨头通过高温煅烧制备骨灰瓷原料。采用XRD和SEM方法表征三种骨灰料的晶相结构和显微结构。实验结果表明 :三种骨灰料经 14 0 0℃煅烧后均存在Ca1 0 (PO4 ) 6(OH) 2 、α -Ca3(PO4 ) 2 种晶相。在 132 0℃煅烧的三种骨灰料中 ,按牛、猪、羊顺序 ,Ca1 0 (PO4 ) 6 (OH) 2 含量分别为 87 2 %、89 1%、71 9% ;β-Ca3(PO4 ) 2 含量最高 ,其可塑性和成瓷性能好 ,从晶相上考虑选择羊骨为较佳的骨灰瓷原料。从白度和透光度上考虑选择牛骨为较佳原料。随着煅烧温度升高 ,三种骨头料的β-Ca3(PO4 ) 2 含量增加 ,羊骨和牛骨中的Ca1 0 (PO4 ) 6 (OH) 2 含量减少 ,而猪骨的Ca1 0(PO4 ) 6 (OH) 2 含量反而增加。因此煅烧温度升高对羊骨和牛骨有利 ,而对猪骨不利     

建筑装饰陶瓷饰面砖的应用与发展

分析建筑装饰陶瓷饰面砖的装饰特点，针对陶瓷饰面砖自重大、易脱落、装饰效果受装饰施工技术及质量的影响等问题，提出陶瓷饰面砖的发展应注重适应装饰施工技术及应用而进行产品的技术创新。     

Characterization of ramie yarn treated with sodium hydroxide and crosslinked by 1,2,3,4‐butanetetracarboxylic acid

Ramie yarns were treated with various concentrations of NaOH at room temperature and subsequently crosslinked with 1,2,3,4‐butanetetracarboxylic acid (BTCA). The microstructure and tensile properties of the treated yarns were characterized. X‐ray diffraction (XRD) and FTIR were used to study the crystalline structure of the resultant ramie yarns. The results showed that the maximum change in the structure of the alkali‐modified ramie took place at 16% NaOH, which would completely transform cellulose I to cellulose II. At the same time, the crystallinity index and fiber orientation decreased to the minimum value while the absorption properties were enhanced. The average degree of polymerization (DP ) of the treated ramie yarns slightly decreased after NaOH treatment. Tensile properties including tenacity, breaking elongation, and modulus of the treated yarns were also investigated. Scanning electron microscopy (SEM) was used to investigate the breakage of the treated yarns. © 2003 Wiley Periodicals, Inc. J Appl Polym Sci 91: 1857–1864, 2004     

Synthesis and properties of new polymerized monomer reactants matrix resins of pyrrolone–benzimidazole copolymers containing pyridine unit

A series of new polymerized monomer reactants (PMR) matrix resins of poly(pyrrolone‐benzimidazole)s containing a pyridine unit (PPBP) were synthesized by polycondensation of monoethyl ester of cis‐5‐norbornene‐endo‐2,3‐dicarboxylic acid, 2,6‐diphenyl ester pyridinedicarboxylic acid or 3,5‐diphenyl ester pyridinedicarboxylic acid, and diethyl ester of 4,4′‐oxydiphthalic acid with 3,3′‐diaminobenzidine in a mixing solution of anhydrous ethyl alcohol and N‐methylpyrrolidone under given temperature and pressure conditions. The resulting resin solutions showed good solubility in polar organic solvents and stability at room temperature. The corresponding PPBP matrix resin, molded powder, and molded plate were prepared by undergoing amidation, imidization, cyclization, and crosslinking reactions when the reaction temperature was increased from 80 to 350°C, successively; the crosslinking structure was formed by the reverse Diels–Alder reaction at 270–290°C under 50 MPa pressure (2.5–3.5 MPa displayed by the pressure meter). The chemical reactions and properties of the resulting PPBP were studied by means of FTIR, TGA, and DMA methods, and the results indicated that the kinds of PPBP materials retain excellent thermal stability and processability; when the initial decomposition temperature was above 620°C the T_g was at 413.5°C for 3,5‐PPBP‐20 molded plate. © 2004 Wiley Periodicals, Inc. J Appl Polym Sci 91: 3981–3990, 2004     

Augment low-field intra-operative MRI with preoperative MRI using a hybrid non-rigid registration method

Background

Preoperatively acquired diffusion tensor image (DTI) and blood oxygen level dependent (BOLD) have been proved to be effective in providing more anatomical and functional information; however, the brain deformation induced by brain shift and tumor resection severely impairs the correspondence between the image space and the patient space in image-guided neurosurgery.

Method

To address the brain deformation, we developed a hybrid non-rigid registration method to register high-field preoperative MRI with low-field intra-operative MRI in order to recover the deformation induced by brain shift and tumor resection. The registered DTI and BOLD are fused with low-field intra-operative MRI for image-guided neurosurgery.

Results

The proposed hybrid registration method was evaluated by comparing the landmarks predicted by the hybrid registration method with the landmarks identified in the low-field intra-operative MRI for 10 patients. The prediction error of the hybrid method is 1.92 ± 0.54 mm, and the compensation accuracy is 74.3 ± 5.0%. Compared to the landmarks far from the resection region, those near the resection region demonstrated a higher compensation accuracy (P-value = .003) although these landmarks had larger initial displacements.

Conclusions

The proposed hybrid registration method is able to bring preoperatively acquired BOLD and DTI into the operating room and compensate for the deformation to augment low-field intra-operative MRI with rich anatomical and functional information.