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Articles by F. ZHOU
Total Records ( 4 ) for F. ZHOU
  F. ZHOU , J.X. XIAO , Y. HUA , B.O. NGANDZALI and Q.J. SHAO
  An 8-week feeding trial was conducted to determine the effects of dietary methionine level on juvenile black sea bream Sparus macrocephalus. Fish (initial body weight: 14.21 ± 0.24 g) were reared in eighteen 350-L indoors flow-through circular fibreglass tanks (20 fish per tank). Isoenergetic and isonitrogenous diets contained six levels of L-methionine ranging from 7.5 to 23.5 g kg−1 of dry diet in 3.0 g kg−1 increments at a constant dietary cystine level of 3.1 g kg−1. Growth performance and feed utilization were significantly influenced by dietary methionine levels (< 0.05). Maximum weight gain (WG), specific growth rate (SGR), feed efficiency ratio, protein efficiency ratio and protein productive value (PPV) occurred at 17.2 g methionine kg−1 diet, beyond which they showed declining tendency. Protein contents in whole fish body and dorsal muscle were positively correlated with dietary methionine level, while muscle lipid content was negatively correlated with it. Apparent digestibility coefficients (ADCs) of dietary nutrients were significantly affected by dietary treatments except for ADCs of crude lipid. Fish fed the grade level of methionine demonstrated a significant improvement in whole-body methionine content, total essential amino acids (∑EAA), total non-essential amino acids (∑NEAAs) and ∑EAA/∑NEAA ratio (< 0.05). Regarding serum characteristics, significant differences were observed in total cholesterol, glucose and free methionine concentration (> 0.05), while total protein level and triacylglycerol concentration kept relatively constant among treatments (< 0.05). Analysis of dose response with second-order polynomial regression on the basis of either SGR or PPV, the optimum dietary methionine requirements of juvenile black sea bream were estimated to be 17.1 g kg−1 of diet (45.0 g kg−1 methionine of protein) and 17.2 g kg−1 of diet (45.3 g kg−1 methionine of protein) in the presence of 3.1 g kg−1 cystine, respectively.
  B.O. NGANDZALI , F. ZHOU , W. XIONG , Q.J. SHAO and J.Z. XU
  The 8-week experiment was conducted to evaluate the effects of partial replacement of fish meal (FM) with soybean protein concentrate (SPC) on juvenile black sea bream, Acanthopagrus schlegelii (10.70 ± 0.04 g). Diets were formulated to replace FM protein by SPC at 0, 8, 16, 24, 32 or 40% (designated as T1, T2, T3, T4, T5 and T6, respectively). Diets except T1 were supplemented with phytase at 2000 phytase activity U kg−1. The results showed that survival rate, growth performance and feed utilization were not significantly affected by increasing dietary SPC. Fish fed diet T3 had higher feed intake compared to those fed T1, T2 and T5 diets. Whole body compositions of black sea bream were significantly influenced by SPC replacing FM except for protein, ash and phosphorus content. Condition factor of fish was significantly lower in T2 than that of fish in T3 group. Apparent digestibility coefficients (ADCs) of dry matter was higher in fish fed T6 diet than those of fish fed T1 and T2 diets, ADCs of phosphorus increased with dietary SPC level up to T3 and then decreased. The results obtained in this study indicate that FM protein could be effectively replaced by SPC protein with phytase in diet of black sea bream.
  A Gandy , J. T Kvaloy , A Bottle and F. Zhou
 

Recently there has been interest in risk-adjusted cumulative sum charts, CUSUMs, to monitor the performance of e.g. hospitals, taking into account the heterogeneity of patients. Even though many outcomes involve time, only conventional regression models are commonly used. In this article we investigate how time to event models may be used for monitoring purposes. We consider monitoring using CUSUMs based on the partial likelihood ratio between an out-of-control state and an in-control state. We consider both proportional and non-proportional alternatives, as well as a head start. Against proportional alternatives, we present an analytic method of computing the expected number of observed events before stopping or the probability of stopping before a given observed number of events. In a stationary set-up, the former is roughly proportional to the average run length in calendar time. Adding a head start changes the threshold only slightly if the expected number of events until hitting is used as a criterion. However, it changes the threshold substantially if a false alarm probability is used. In simulation studies, charts based on survival analysis perform better than simpler monitoring schemes. We present one example from retail finance and one medical application.

  A.M.A. Salim , H.P. Pan , M. Luo and F. Zhou
  Delineation of lithology and mineralization of different rock units of the Chinese Continental Scientific Drilling Main Hole (CCSD-MH), Eastern China, is the main objective of this study. Different logging operations were conducted in the studied area. Subduction and metamorphism lead to high compressional wave velocity (Vp) and low neutron density (CNL) values of different rocks. Eclogites and ultramafics show high bulk density (DEN) and photoelectric index (Pe) values, due to their high content of heavy and basic minerals. Gneisses are more radioactive (GR) and resistive (RD), since they have high feldspar content. Serpentinization causes in high CNL values of ultramafics. Retrogression of eclogites to amphibolite facies detected from the general decrease of DEN, Pe, Vp and RD and increase of GR and CNL values. This is mainly due to the secondary alteration and break down of heavy and basic minerals to retrograde materials such as amphibole, mica, zoisite and quartz during exhumation process. Shearing of paragneisses lowers their Vp values. Generally mineralization increases DEN, Pe of eclogites and decreases their GR value and decreases DEN, Pe of the gneisses and increases their GR readings.
 
 
 
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