铝合金筒形机匣等温精锻成形工艺的研究

本文通过模拟试验研究了铝合金筒形机匣成形过程，稳定了合理的等温精锻成形工艺规程，设计了结构先进的模具，生产出了合格的锻件。     

真丝云纹印花的前准备工序技术总结

针对真丝云纹印花的难度，总结了设计、放样、画稿、制版四个工序中的重点技术，特别是对电脑分色描稿、计算机电子加网制作黑白片等技术与云纹花样的印制效果进行了探索，对生产具有指导作用。     

Self Q switching of a CW mode-locked Nd:YLF laser bycavity length detuning

The cavity length of a CW mode-locked Nd:YLF laser is detuned to investigate the effect of detuning on the output of the laser. Negative detunings of 0.4 to 2.4 μm result in periodic modulations of the pulse envelope. Further negative detunings of 2.4 to 3.4 μm produce undamped regular spikings, that is, stable self-Q-switching behavior with mode-locked pulses of 30~47 ps pulsewidths, which are as short as those of plain mode locking without Q switching. Similar self-Q-switching behavior is also produced by positive detunings, but the stability is very poor     

Reflex sympathetic dystrophy in hemiplegia--two case reports and review of the literature

Reflex sympathetic dystrophy (RSD) can be precipitated by a variety of events. We report two cases of RSD in hemiplegic patients detected within three months of the cerebrovascular accidents. Diagnosis of RSD was based upon clinical and scintigraphic findings. Management included elevation, range of movement of the affected joints and analgesics. With treatment, the pain and swelling subsided, range of motion of joints improved and the patients were able to participate in the rehabilitation programme. A high index of suspicion, early diagnosis and aggressive treatment were found to be essential for the successful treatment of RSD.     

Three-dimensional finite element analysis of thick laminated plates

A displacement-based, three-dimensional finite element scheme is proposed for analyzing thick laminated plates. In the present formulation, a thick laminated plate is treated as a three-dimensional inhomogeneous anisotropic elastic body. Particular attention is focused on the prediction of transverse shear stresses. The plane of a laminated plate is first discretized into conventional eight-node elements. Various through-thickness interpolation is then denned for different regions of the plate; layerwise local shape functions are used in the regions where transverse shear stresses are of interest, while an ad hoc global-local interpolation is used in the region where only the general deformation pattern is concerned. For satisfying the displacement compatibility between these two regions, a transition zone is introduced. The model incorporates the advantages of the layerwise plate theory and the single-layer plate theory. Details of formulation will be presented together with several numerical examples for demonstrating the proposed scheme.     

Parathyroid hormone (PTH) stimulates adrenocorticotropin release in AtT-20 cells stably expressing a common receptor for PTH and PTH-related peptide

Complementary DNA encoding a rat bone PTH/PTHrP receptor was stably expressed in the murine corticotroph cell line, AtT-20. Several clones, expressing variable numbers of PTH/PTHrP receptors, were developed. In contrast to the relatively low binding affinity (apparent Kd = 15 nM) observed in COS-7 cells transiently expressing the PTH/PTHrP receptor, all AtT-20 stable transfectants bound [Nle8,18,Tyr34]bPTH(1-34)NH2 (NlePTH) with an affinity that was indistinguishable from that observed in ROS 17/2.8 cells expressing native PTH/PTHrP receptors. Additionally, NlePTH dramatically increased cAMP accumulation and ACTH release in AtT-20 cells expressing the PTH/PTHrP receptor with an ED50 of 0.6 +/- 0.3 and 0.3 +/- 0.1 nM, respectively. The high binding affinity and the high efficacy of NlePTH in stimulating cAMP accumulation and ACTH release indicate that the PTH/PTHrP receptor is efficiently coupled to the intracellular signalling system responsible for stimulation of ACTH release in AtT-20 cells. No additivity of cAMP accumulation or of ACTH release was observed when these cells were treated with maximally active concentrations of both NlePTH and CRF. This suggests that the receptors for both of these hormones share the same intracellular effectors, and that intracellular signaling in AtT-20 cells is not compartmentalized. Additionally, the ability of NlePTH to stimulate ACTH release in AtT-20 cells, a function that is normally performed by CRF, demonstrates promiscuity between activated receptors and distal biological functions.     

开磷集团都匀氮肥厂造气废水治理

开磷集团都匀氮肥厂造气废水经沉淀捞渣,去除悬浮物后进入微涡流塔板澄清器中进一步澄清处理,经澄清后的水进入高效玻璃钢冷却塔冷却后,清水泵打入洗气塔内循环使用。     

西方话语中的中国制造

在C C TV总部大楼的方案设计竞赛中,荷兰著名的大都会建筑事务所(O M A)获邀参加,和几十家境内外的建筑事务所进行角逐,在评委们的几经反复之后,最终库哈斯的方案胜出,这一结果对于很多人来说都是难以令人接受的,所以随之而来的便是铺天盖地的质疑之声,概括来说,公众对之的批评