Long‐memory dynamic Tobit models

We introduce a long‐memory dynamic Tobit model, defining it as a censored version of a fractionally integrated Gaussian ARMA model, which may include seasonal components and/or additional regression variables. Parameter estimation for such a model using standard techniques is typically infeasible, since the model is not Markovian, cannot be expressed in a finite‐dimensional state‐space form, and includes censored observations. Furthermore, the long‐memory property renders a standard Gibbs sampling scheme impractical. Therefore we introduce a new Markov chain Monte Carlo sampling scheme, which is orders of magnitude more efficient than the standard Gibbs sampler. The method is inherently capable of handling missing observations. In case studies, the model is fit to two time series: one consisting of volumes of requests to a hard disk over time, and the other consisting of hourly rainfall measurements in Edinburgh over a 2‐year period. The resulting posterior distributions for the fractional differencing parameter demonstrate, for these two time series, the importance of the long‐memory structure in the models. Copyright © 2006 John Wiley & Sons, Ltd.     

文化景观和土地利用自然保护O社会层面

文化景观是指居住在地球上的人类集团为满足社会经济需要所创造的景观，如：农田、城市、荒漠中的绿洲等。文化景观由人们创造，被人们利用，但是如何保持良好的生物多样性，并且与自然和谐共处呢？文化景观面临的挑战是社会经济的复杂性凌驾于自然保护的生物多样性之上。本书尝试接近这个复杂的事物，并提供理论背景、实践方针和实例。本书吸纳了来自欧洲和美国的科学家、管理者、独立顾问和政治家的观点。怀着对农业特殊的重视，     

糖皮质激素在肾小球疾病治疗中的进展

目的 :综述糖皮质激素治疗肾小球疾病的最新进展 ,以指导临床实践 ;方法 :对近年来国内外有关糖皮质激素在肾小球疾病治疗中的研究资料和文献进行综合分析 ;结果 :目前糖皮质激素对不同病因和病理类型的肾小球疾病的治疗方法和疗程都有很大的进展 ;结论 :糖皮质激素仍是治疗原发性和某些继发性肾小球疾病的主要药物 ,而用法却在不断地改进 ,临床医师应对其进行及时了解 ,以指导临床实践     

羔山羊的超数排卵及体外受精

以ＦＳＨ或ＦＳＨ－ＬＨ四种不同处理方法对２９只６８～１１０日龄羔山羊进行超排处理，结果共采集卵泡卵母细胞７０８枚，平均每只羔羊采卵２４．４枚．卵母细胞经体外培养２４ｈ后有８１．２％的卵发育为成熟卵．分别用经钙离子载体Ａ＿（２３１７８）或肝素进行获能处理的精子对体外培养成熟的卵子进行体外受精，结果精子穿入卵率分别为５４．８％和３４．４％，发育至２～４细胞胚的卵裂率分别为２８．６％和４１．９％．采用ＦＳＨ－ＬＨ（肌注）进行超排处理得到的卵子经体外受精处理后，其卵裂率明显高于采用其它超排方法得到卵子的卵裂率．     

中国的红土它们的性质、管理和利用

中国的红土高度风化，极度贫瘠而且易被腐蚀。然而，它们又是中国能够被用于农业生产的最后的土壤，鉴于中国人口众多并且数量仍在增加，研究红土的应用是十分重要的。世界上还有很多地区有红土：南美洲的热带和亚热带地区、非洲和东南亚。而中国的这些红土很具有代表性，因此，如果中国的红土能被成功利用，那么将会在其他国家和地区产生巨大的潜在应用价值。     

Ergonomic Evaluation on Taxi Drivers Compartment

Driving involves long hours of physical work within c onfined compartment. Taxi drivers usually work with prolonged working hours, add itional stress may likely be induced on particular body limbs. Occupational heal th may occur and working efficiency may potentially be affected resulting fr om fatigues, pains or diseases. These problems, however, could be remedied if mo re attention is paid on seating design, the workplace and driving postures adopt ed. Ergonomics design can provide better understanding...     

Intracellular recordings from Deiters' neurons in response to saccular and oculomotor nucleus stimulations

Summary 2 populations of cells were found in the Deiters' nucleus responsive to direct electrical stimulation of the ipsilateral saccule. Only those Deiters' neurons activated monosynaptically from the saccule could be driven antidromically from the oculomotor nucleus. Such an intracellular study provides strong evidence for a tri-neuronal arc in the sacculo-ocular reflex for vertical eye movements.Acknowledgment. This study was supported by the Medical Faculty Research Grant No. 377/004/03, University of Hong Kong.     

Fusion of two novel genes, RBM15 and MKL1, in the t(1;22)(p13;q13) of acute megakaryoblastic leukemia.

t(1;22) is the principal translocation of acute megakaryoblastic leukemias. Here we show this chromosomal rearrangement to result in the fusion of two novel genes, RNA-binding motif protein-15 (RBM15), an RNA recognition motif-encoding gene with homology to Drosophila spen, and Megakaryoblastic Leukemia-1 (MKL1), a gene encoding an SAP (SAF-A/B, Acinus and PIAS) DNA-binding domain.