强夯法在地基处理中的应用

柱锤强夯工法主要特征是利用高锤底静接地压力的柱型锤，在形成的夯孔内夯击，人为地降低起夯面，用较小能量达到增大加固深度的效果。通过两例工程实践证明，该工法具有加固深度大、效果好、工程造价低、振动影响小、适用范围广等突出特点。     

强夯加固法在大型H型钢厂原料场地基土处理中的应用

强夯置换及强夯法在原料场填土地基加固处理中应用，填方边坡稳定，填土承载力达到设计要求，施工周期短，经济效益良好。     

钢城新苑地基处理工程实践

强夯法具有效果好、工期快、造价低等优点。钢城新苑住宅小区饱和黄土的地基采取强夯法处理,改善了地基土中孔隙水压力的消散条件,强夯效果较好。钢城新苑东区8#楼地基承载力较高,采用了强夯置换处理方案,以达到消除黄土湿陷性和大幅提高承载力的目的。同时,对强夯处理湿陷性黄土时应注意区分地基土的状态、强夯处理饱和黄土采用换填垫层的处理方法、强夯置换法处理各种软弱地的方法进行了分析和讨论。     

强夯置换碎石墩法在公路软土地基处理中的应用

以武汉市黄鹤路市政道路工程为例,介绍了强夯置换碎石墩法处理软土地基施工技术及质量检测方法,探讨了强夯置换设计与施工中各项参数的选择问题,并结合工程实际加以验证.     

基于强夯工程设计的岩土矿坑技术研究

综合利用土体动力学理论,结合弹塑性有限元分析,研究了不同地基条件、不同的夯击方式下土体的应力-应变特征,从理论上确定了不同地基条件下,强夯法施工中的设计参数选定方法,包括锤重、落距、夯距等。在常用的地基或填方参数情况下,有效加固范围是夯锤直径的1.5～2.5倍.以此作为强夯设计依据,对工程实践具有一定的指导意义。     

强夯时夯锤排气孔土块飞溅原因的初步分析

海滨填土强夯时,土块会从夯锤排气孔飞出,影响设备和人员的安全,本文试对这一现象进行分析.     

淤泥软土地基处理方法浅析

目前,软土地基处理的方法有预压法、换填法、强夯法和强夯置换法、砂石桩法、水泥土搅拌法及其他地基处理法。     

地基强夯处理技术在钢铁厂的应用

结合工程实例,根据具体试验所取得的数据,计算强夯处理后的地基承载力、压缩模量、复合地基承载力,计算值在安全范围之内,证实了强夯置换地基处理设计的安全性、可靠性,为以后类似工程提供了良好的借鉴。     

强夯技术在地基处理中的应用

根据地质条件，结合工程实际，简要介绍强夯技术在地基处理中的应用。说明强夯技术在素填土地基处理中是一种经济可靠的方法。     

强夯法在30万m^2复杂填土地基处理中的应用

叙述强夯法在30万m^2复杂填土中的应用，着重阐述试夯过程中的比对方案、试夯检测结果的分析以及地基处理目标和设计施工参数的确定的过程，为强夯法在复杂填土工程中的应用提供参考。     

Weathering Steel Cladding Failure

An investigation into the corrosion of a weathering steel facade is described. Failure is found to be the result of both material failure and inadequate mechanical design. Negative pressures in certain areas of the building are seen as having accelerated the corrosion process. Options for repair and replacement are presented, and the final replacement project is recounted. It is recommended that mechanical investigations be included in the study of curtain‐wall deterioration cases.     

带电作业机器人机械臂动力学建模与运动规划

研制了一种双臂、双机械手的绝缘子串更换带电作业机器人.分解了机器人作业过程中机械臂的运动.利用拉格朗日法并结合关节电机电枢电压方程对机器人机械臂基本动作进行动力学建模,得出机械臂基本动作的统一动力学模型,计算出机械臂2的动力学方程,提出基于五次多项式插值的机械臂运动轨迹规划方法,计算出机械臂2各关节运动方程.在ADAMS环境下进行机器人机械臂动力学和运动学仿真,结果验证了动力学模型的正确性,同时各关节运动轨迹规划满足运动学要求.最后在实际线路上进行机器人带电更换绝缘子串实验,结果表明机器人机械臂各关节运动获得了较好的动态性能,验证了本文提出的五次多项式插值机械臂运动轨迹规划具有较强的工程实用性,进一步提高了机器人的作业效率和稳定性.      

换填法建筑地基处理的工程实录

结合某工程的地基处理，对换填法的应用作了较详细的阐述。     

Is there a protein ligase?

Results obtained from experiments dealing with mammalian, bacterial, phage and mitochondrial protein biosynthesis as well as certain enzymatically performed amino acid replacement studies on Kunitz trypsin inhibitor strongly suggest that protein ligation may be occuring in vivo. Amino acid substitution experiments prove the reversibility of endopeptidase reactions, and protein ligation is the reverse of endopeptidase reaction. These experiments are discussed in detail and the suggestion is made that ligation may also be useful in the repair of certain essential proteins which may become damaged.     

Molecular parameters of type IV alpha-internexin and type IV-type III alpha-internexin-vimentin copolymer intermediate filaments

During neuronal development, a dynamic replacement mechanism occurs in which the type VI nestin and type III vimentin intermediate filament proteins are replaced by a series of type IV proteins beginning with alpha-internexin. We have explored molecular details of how the type III to type IV replacement process may occur. First, we have demonstrated by cross-linking experiments that bacterially expressed forms of alpha-internexin and vimentin form heterodimer molecules in vitro that assemble into copolymer intermediate filaments. We show using a urea disassembly assay that alpha-internexin molecules are likely to be more stable than those of vimentin. Second, by analyses of the induced cross-links, we have determined the axial lengths of alpha-internexin homodimer and alpha-internexin-vimentin heterodimer molecules and their modes of alignments in filaments. We report that these dimensions are the same as those reported earlier for vimentin homopolymer molecules and, by implication, are also the same for the other neuronal type IV proteins. These data suggest that during neuronal development, alpha-internexin molecules are readily assimilated onto the pre-existing vimentin cytoskeletal intermediate filament network because the axial lengths and axial alignments of their molecules are the same. Furthermore, the dynamic replacement process may be driven by a positive equilibrium due to the increased stability of the alpha-internexin network.     

Recovery of physiologic and clinical function after low anterior resection of the rectum for carcinoma: myth or reality?

Recently, site-directed mutagenesis has been applied to protein-derived metal ligands in a way that permits the replacement in trans of protein ligands. The chemical diversity of ligands available using this method far exceeds that attainable using standard mutagenesis. Non-conservative ligand replacement can yield novel metalloproteins with altered ligand-binding, enzymatic activities, and spectroscopic properties. Conservative ligand substitution, or 'ligand detachment', allows the structural and functional effects of the covalent linkage between the ligand and the protein to be evaluated; this linkage is often proposed to play a critical role in modulating the structure and reactivity of the metal center. Furthermore, this method can be exploited to study the details of molecular recognition at the structural, thermodynamic, and dynamic levels.     

Expression of polysialylated neural cell adhesion molecule by proliferating cells in the subependymal layer of the adult rat, in its rostral extension and in the olfactory bulb

The highly sialylated isoform of the neural cell adhesion molecule is thought to be expressed predominantly in the developing nervous system, where it is implicated in a variety of dynamic events linked to neural morphogenesis. It has become increasingly evident, however, that this "embryonic" neural cell adhesion molecule isoform continues to be expressed in certain adult neuronal systems, and in particular, in those that can undergo structural plasticity. In the present study, we performed light microscopic immunocytochemistry with an antibody specific for polysialylated neural cell adhesion molecule and confirmed our earlier observations [Bonfanti L. et al. (1992) Neuroscience 49, 419-436] showing polysialylated neural cell adhesion molecule-immunoreactive cells in the subependymal layer of the lateral ventricle of the adult rat, a region where cell proliferation continues into the postnatal period. In addition, we used an antibody raised against the proliferating cell nuclear antigen and found that proliferating cells continue to be visible in this area, even in the adult. Double immunolabeling showed that many of these newly generated cells displayed high polysialylated neural cell adhesion molecule immunoreactivity. Cells from a portion of the subependymal layer migrate to the olfactory bulb and contribute to the continual replacement of its granule neurons [Luskin M. B. (1993) Neuron 11, 173-189]. We found polysialylated neural cell adhesion molecule-immunoreactive cells all along the pathway purported to be followed by the newly generated cells to their final destination and in neurons corresponding to granular and periglomerular cells in the olfactory bulb. Our present observations thus support the contention that polysialylation is a feature of neurons capable of dynamic change and may contribute to the molecular mechanisms permitting cell proliferation and migration not only during development but also in the adult.     

Oral-contraceptive-induced hypertension after adrenalectomy and hypophysectomy

The cause of oral-contraceptive-induced hypertension in certain susceptible subjects is obscure. We describe a woman who was receiving replacement doses of fludrocortisone acetate after adrenalectomy and hypophysectomy who developed high blood pressure while ingesting an estrogen-containing oral contraceptive. Renin substrate level was increased, but renin activity was suppressed and unresponsive to tilting. The patient developed a markedly exaggerated natriuresis when infused with saline. Both blood pressure and her responses to infused sodium and tilting normalized after discontinuance of the oral contraceptive medication. In this adrenalectomized patient, the estrogenic component of the pill acting synergistically with a fixed ("nonsuppressible") replacement dose of mineralocorticoid seems to have caused a volume-related hypertension.     

Arrival Sampling without Replacement for Simulating Fixed Entity Streams in Civil Engineering Systems

The need for sampling arrivals without replacement for simulating certain types of civil engineering systems is presented. Specifically, sampling requirements in the form of arriving entities such as a stream of automobiles and trucks, aircraft, shipping vessels, etc., and their scheduling on transportation systems are discussed. A methodology for random sampling, without replacement, of entities from a known discrete distribution is presented. Computational complexities associated with organization and randomization of large input streams are addressed. In addition to addressing issues related to the generation of discrete and continuous event occurrences in the entity stream, issues related to incorporating scheduling overrides into the final entity streams are discussed. The methods discussed have successfully been applied for generating streams of shipping vessels for a simulation study of the Panama Canal.