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DYNAMIC CHARACTERISTICS OF BEARINGS AND PIVOTS OF HARD DISK DRIVES

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DYNAMIC CHARACTERISTICS OF BEARINGS AND PIVOTS OF HARD DISK ...

Effects of a multi-enzyme complex on growth performance,nutrient utilization and bone mineralization of meat duck

第五届国际振动工程会议

作者： N.Guo L.M.Xu R.M.Lin H.Du C.D.Deng School of Mechanical and Production Engineering Nanyang Technological University Singapore 639798 School of Mechanical and Production Engineering Nanyang Technological University Singapore 639798 School of Mechanical and Production Engineering Nanyang Technological University Singapore 639798 School of Mechanical and Production Engineering Nanyang Technological University Singapore 639798 nidec singapore pte ltd 36 Loyang WaySingapore

＜正＞ It is known that the quasi-rigid bodymode（QR mode）vibration is one of the mainsources for generating the residual vibration insettling operation and limiting the servo bandwidth,and is mainly caused by the stiffness of the pivot,themass and structure of the head actuator *** ballbearings inside the pivot determine the pivotstiffness,which in turn,determine the effectivestiffness of the head actuator *** this paper,the stiffness-related issues among ball bearings,pivot and head actuator assembly are studiedtheoretically and *** shows that thepivot effective radial stiffness depends not only onthe stiffness of the ball bearing but also on theconnection method used to attach the pivot to thehead actuator *** is also shown from themeasurement and analysis that the resonancefrequency of the QR mode,determined by the pivoteffective radial stiffness and inherent properties ofthe head actuator arm,can be moved to a higherfrequency by using a more rigid pivot and a morestiff joint.

关键词： ball bearing pivot stiffness natural frequency hard disk drive

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Journal of Animal Science and Biotechnology 2015年第4期6卷 402-409页

作者： Qiufeng Zeng Xueqin Huang Yuheng Luo Xuemei Ding Shiping Bai Jianping Wang Yue Xuan Zhuowei Su Yonggang Liu Keying Zhang Institute of Animal Nutrition Key Laboratory for Animal Disease-Resistance Nutrition of China Ministry of EducationSichuan Agricultural University Adisseo Asia Pacific pte ltd

Background： Previous studies with broiler have shown dietary supplementation with multi-enzyme complex containing non-starch polysaccharides （NSP） degrading enzymes and phytase is efficient in releasing phosphorus （P）, calcium （Ca）, energy and amino acids from corn-soybean meal diets or corn-sorghum diets, hence compensating considerable levels of nutrients in formulation. Notwithstanding, such potentials have not been well defined in duck nutrition. Giving China being the largest duck producing country, we conducted this study to establish adequate specifications of major nutrients along with multi-enzyme complex to meat duck from day-old to slaughter, focusing on performance, utilization of nutrients and bone mineralization. Five dietary treatments were： Positive control （PC,T1）： the nutrients concentration of diet for 1 to 14 d of age were apparent metabolizable energy（AME） 2,800 kcal/kg, crude protein （CP）1 9.39%, Ca 0.85%, available phosphorus （avP） 0.42%; for 15 to 35 d of age these parameters were AME 2,900 kcal/kg, CP 16.47%,Ca 0.76%,avP 0.38%; Negative control 1（NC1,7-2）, the AME and digestible amino acids （DAA） were reduced by 70 kcal/kg and 2.0%, avP and Ca by 1.0 g/kg from PC diet; Negative control 2（NC2,T4）, the down- spec from PC diet was AME 100 kcal/kg, DAA 2.5%, avP 1.5 g/kg and Ca 1.2 g/kg; The enzyme complex was added at the same dosage （200 mL/1,000 kg） on NC1 （T3） and NC2 （T5） diets. Results： Comparing with the ducks fed on T1, T3 and T5 diets, the birds fed on NC2 diet showed the lowest （P 〈 0.05） body weight （ d 14 and 35）, feed intake （d 35）, tibia ash, Ca and P contents （d 14 and 35）, and the utilization of nutrients （P 〈 0.05）. The supplementation with the enzyme complex to the NC diets restored growth rate, utilization of nutrients and bone mineralization to the level of the PC diet, and increased AME by 60 kcal/kg and 117 kcal/kg, respectively for the NC1 and NC2 diets. Conclusion： These results suggest that down-spec AME by 100 kcal/kg,

关键词： Formulation specification Growth Phytase Meat duck Non-starch polysaccharides enzyme

Facile Preparation of Danazol Nanoparticles by High-Gravity Anti-solvent Precipitation （HGAP） Method

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Chinese Journal of Chemical Engineering 2009年第2期17卷 318-323页

作者：赵宏王洁欣张海霞沈志刚甄崇礼陈建峰 Sin-China Nano Technology Center Key Lab for Nanomaterials Ministry of Education Beijing University of Chemical Technology Beijing 10029 China Nanomaterials Technology pte. ltd. Singapore

The nanoparticles of the hydrophobic drug of danazol with narrow size distribution are facilely prepared by controlled high-gravity anti-solvent precipitation （HGAP） process. Intensified micromixing and uniform nucleation environment are created by the high-gravity equipment （rotating packed bed） in carrying out the anti-solvent precipitation process to produce nanoparticles. The average particle size decreases from 55 μm of the raw danazol to 190 nm of the nanoparticles. The Brunauer-Emmett-Teller （BET） surface area sharply increases from 0.66 m^2·g^-1 to 15.08 m^2·g^-l. Accordingly, the dissolution rate is greatly improved. The molecular state, chemical composition, and crystal form of the danazol nanoparticles remains unchanged after processing according to Fourier transform infrared （FTIR） and X-ray diffraction （XRD）, The high recovery ratio and continuous production capacity are highly appreciated in industry. Therefore, the HGAP method might offer a general and facile platform for mass production of hydrophobic pharmaceutical danazol particles in nanometer range.

关键词： high-gravity antisolvent precipitation, rotating packed bed danazol, nanoparticles, dissolution rate

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超声显微镜及其应用

声学技术 1992年第Z1期 26-28页

作者： W.S.Gan,J.C.Chen,L.James,C.S.Chong Acoustical Services　pte.ltd singapore Acoustical Services　pte.ltd singapore Acoustical Services　pte.ltd singapore Acoustical Services　pte.ltd singapore

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超声显微镜及其应用

声学技术 1992年第1期11卷 26-28页

作者： W.S.Gan J.C.Chen L.James C.S.Chong Acoustical Services pte.ltd singapore Acoustical Services PTE.LTD SingaporeAcoustical Services PTE.LTD SingaporeAcoustical Services PTE.LTD Singapore

Effect of mucin 4 allele on susceptibility to experimental infection with enterotoxigenic F4 Escherichia coli in pigs fed experimental diets

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Journal of Animal Science and Biotechnology 2019年第4期10卷 981-989页

作者： Samantha O.Sterndale Danica J.Evans Josephine P.Mansfield Julie Clarke Shafi Sahibzada Sam Abraham Mark O’Dea David W.Miller Jae Cheol Kim John R.Pluske Agriculture Sciences College of ScienceHealthEngineering and Education Murdoch UniversityMurdochWA 6150Australia CSIRO Health and Biosecurity PO BOX 10041AdelaideBC 5000Australia Antimicrobial Resistance and Infectious Disease Laboratory Murdoch UniversityMurdochWA 6150Australia AB Vista Asia pte.ltd The MezzoWhampoa 329682Singapore

Background: This study investigated the validity of the DNA-marker based test to determine susceptibility to ETECF4 diarrhoea by comparing the results of two DNA sequencing techniques in weaner pigs following experimental infection with F4 enterotoxigenic Escherichia coli(ETEC-F4). The effects of diet and genetic susceptibility were assessed by measuring the incidence of piglet post-weaning diarrhoea(PWD), faecal E. coli shedding and the diarrhoea ***: A DNA marker-based test targeting the mucin 4 gene(MUC4) that encodes F4 fimbria receptor identified pigs as either fully susceptible(SS), partially or mildly susceptible(SR), and resistant(RR) to developing ETEC-F4 diarrhoea. To further analyse this, DNA sequencing was undertaken, and a significantly higher proportion of C nucleotides was observed for RR and SR at the Xba I cleavage site genotypes when compared to SS. However, no significant difference was found between SR and RR genotypes. Therefore, results obtained from Sanger sequencing retrospectively allocated pigs into a resistant genotype(MUC4–), in the case of a C nucleotide, and a susceptible genotype(MUC4+), in the case of a G nucleotide, at the single nucleotide polymorphism site. A total of 72 weaner pigs(age ~ 21 days), weighing 6.1 ± 1.2 kg(mean ± SEM), were fed 3 different diets:(i) positive control(PC) group supplemented with 3 g/kg zinc oxide(Zn O),(ii) negative control(NC) group(no Zn O or HAMSA),and(iii) a diet containing a 50 g/kg high-amylose maize starch product(HAMSA) esterified with acetate. At days five and six after weaning, all pigs were orally infected with ETEC(serotype O149:F4;toxins LT1, ST1, ST2 and EAST). The percentage of pigs that developed diarrhoea following infection was higher(P = 0.05) in MUC4+ pigs compared to MUC4– pigs(50% vs. 26.8%, respectively). Furthermore, pigs fed Zn O had less ETEC-F4 diarrhoea(P = 0.009) than pigs fed other diets, however faecal shedding of ETEC was similar(P > 0.05) between ***

关键词： Diarrhoea Escherichia coli F4 MUC4 Weaner pigs Zinc oxide

A Proven Successful Approach to Managing Mycotoxins in Poultry

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A Proven Successful Approach to Managing Mycotoxins in Poult...

Weather Impact on Heat-Related Illness in a Tropical City State, singapore

国际家禽营养代谢病研讨会

作者： Dian Schatzmayr Erich Erber Kurt Wegleitner Biomin Innovative Animal Nutrition GmbH Austria Biomin Laboratory Singapore Pte.Ltd

Introduction Mycotoxins are toxic secondary metabolites of various fungi, mainly those belonging to the genera Fusarium, Aspergillus and Penicillium. The major classes of mycotoxins in animal feed industry are aflatoxins, zearalenone, trichothecenes (e.g. deoxynivalenol,1-2 toxin, DAS), ochratoxin A, fumonisins and the ergot alkaloids. Their global occurrence is considered to be a major risk factor, as according to the Food and Agriculture Organization (FAO) as much as 25% of the world’s crops are affected annually despite increased efforts of prevention (Cortyl and Heidler, 2001).

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Atmospheric and Climate Sciences 2018年第1期8卷 97-110页

作者： Hai-Yan Xu Xiuju Fu Chin Leong Lim Stefan Ma Tian Kuay Lim Paul Anantharajah Tambyah Mohd Salahuddin Habibullah Gary Kee Khoon Lee Lee Ching Ng Kee Tai Goh Rick Siow Mong Goh Lionel Kim Hock Lee Institute of High Performance Computing Singapore Lee Kong Chian School of Medicine Nanyang Technological University Singapore Ministry of Health Singapore Urban Redevelopment Authority Singapore National University of Hospital Singapore Rolls-Royce singapore pte ltd. Singapore National Environment Agency Singapore Saw Swee Hock School of Public Health National University of Singapore Singapore

In this article we propose a novel hurdle negative binomial (HNB) regression combined with a distributed lag nonlinear model (DLNM) to model weather factors’ impact on heat related illness (HRI) in singapore. AIC criterion is adopted to help select proper combination of weather variables and check their lagged effect as well as nonlinear effect. The process of model selection and validation is demonstrated. It is observed that the predicted occurrence rate is close to the observed one. The proposed combined model can be used to predict HRI cases for mitigating HRI occurrences and provide inputs for related public health policy considering climate change impact.

关键词： Distributed Lag Nonlinear Model Heat-Related Illness Hurdle Model Negative Binomial distribution Weather Factors

Troubleshooting and Optimization of High-Strength Inhibitory Chemical Wastewater Treatment Process

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Chinese Journal of Chemical Engineering 2005年第6期13卷 800-808页

作者：严月根 Calvert C.Churn 何光辉郑巧庚 Philip C.Y.Wong Nanjing SembCorp SUIWU Co ltd Nanjing Chemical Industry Park Nanjing 210047China Eastman Chemical Co. KingsportTNUSA SembCorp Utilities pte ltd 60 Admiralty Road West #02-01Singapore 759947

Wastewaters from the chemical industry are usually of high-strength and may contain minor inhibitory and recalcitrant organics that are at times not readily identifiable. This paper describes the experience of a biological waste water treatment plant （WWTP） processing a COD concentration of 43000 mg·L^-1 wastewater from an oxochemical manufacturing plant. Stage improvements of the plant process by dilution of the inhibitory influent using other chemical wastewater streams resulting in a synergistic process effect, and removal of inhibitory organics by phase separation via acidification, effectively achieved process optimization producing a high quality effluent. In particular, the COD removal efficiency of granular sludge based anaerobic reactors increased from 56% to 90%. The final effluent COD decreased from 250mg·L^-1 to 50mg·L^-1, consistently meeting the COD concentration of 100 mg·L^-1 regulatory discharge limit. The success of the process enhancements supports the hypothesis that long-chain quaternary carboxylic acids act as substrate inhibitors in the biological process.

关键词： operational experience waste water treatment plant (WVCTP) granular sludge chemical wastewater inhibitory recalcitrant long-chain quaternary carboxylic acids