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| 1 | Periodic solutions of a 2nth-order nonlinear difference equation显示文摘In this paper, a 2 nth-order nonlinear difference equation is considered.Using the critical point theory, we establish various sets of sufficient conditions of the nonexistence and existence of periodic solutions.Results obtained complement or improve the existing ones. | ZHOU Zhan 1, YU JianShe 1 & CHEN YuMing 21 School of Mathematics and Information Science, Guangzhou University, Guangzhou 510006, China 2 Department of Mathematics, Wilfrid Laurier University, Waterloo N2L 3C5, Canada | 2010 | Science China Mathematics2010，53，1： | 10 |
| 2 | Environmental factors affecting growth of grasses,herbs and woody plants on a sanitary landfill显示文摘Environmentalfactorsaffectinggrowthofgrasses,herbsandwoodyplantsonasanitarylandfillLanChongyu;WongMinghung(DepartmentofBiolog... | Lan Chongyu Wong Minghung(Department of Biology and Center for Waste Recycling &Environmental Biotechnology, Hong Kong BaptistCollege, 224 Waterloo Road, Kowloon, Hong Kong) | 1994 | Journal of Environmental Sciences1994，6，4： | 5 |
| 3 | DC dielectrophoresis separation of marine algae and particles in a microfluidic chip显示文摘This paper reports a microfluidic method of continuous separation of marine algae and particles by DC dielectrophoresis. The locally non-uniform electric field is generated by an insulating PDMS triangle hurdle fabricated within a PDMS microchannel. Both the particles and algae are subject to negative DEP forces at the hurdle where the gradient of local electric-field strength is the strongest. The DEP force acting on the particle or the algae depends on particles' or algae's volume, shape and dielectric properties. Thus the moving particles and algae will be repelled to different streamlines when passing the hurdle. In this way, combined with the electroosmotic flow, continuous separation of algae of two different sizes, and continuous separation of polystyrene particles and algae with similar volume but different shape were achieved. This first demonstration of DC DEP separation of polystyrene particles and algae with similar sizes illustrates the great influence of dielectric properties on particle separation and potentials for sample pretreatment. | SONG YongXin1, YANG JianDong1, SHI XiaoFei4, JIANG Hai3, WU YanBin1, PENG Ran1, WANG Qi5, GONG Ning2, PAN XinXiang1, SUN YeQing2 & LI DongQing1,31Department of Marine Engineering, Dalian Maritime University, Dalian 116026, China 2Institute of Environmental Systems Biology, Dalian Maritime University, Dalian 116026, China 3Department of Mechanical and Mechatronics Engineering, University of Waterloo, Waterloo, ON, N2L 3G1, Canada 4College of Information Science and Technology, Dalian Maritime University, Dalian 116026, China 5Department of Respiratory Medicine, the Second Hospital Affiliated to Dalian Medical University, Dalian 116026, China | 2012 | Science China Chemistry2012，55，4： | 3 |
| 4 | Prophylactic hyperdynamic postoperative fluid therapy after aneurysmal subarachnoid hemorrhage:a clinical,prospective,randomized,controlled study显示文摘 | Egge A Waterloo K Sjoholm H | 2001 | Neurosurgery2001，49，： | 1 |
| 5 | Reduced neuro- psychological test performance in asymptomatic carotid stenosis: The Troms Study显示文摘 | Mathiesen EB Waterloo K Joakimsen O | 2004 | Neurology2004，62，5： | 1 |
| 6 | Prospectiveevaluation of the change of predialysis protein-bound uremic soluteconcentration with postdilution online hemodiafiltration 显示文摘 | Meert N Waterloos MA Van Landschoot M | 2010 | ArtifOrgans2010，34，7： | 1 |
| 7 | Prophylactic hyperdynamic postoperative fluid therapy after aneurysmal subarachnoid hemorrhage:a clinical,prospective,randomized,controlled study显示文摘 | Egge A Waterloo K Sj(o)holm H | | 0，，03： | 1 |
| 8 | Effect of long - term oxygen therapy on cognitive and neurological dysfunction in chronic obstructive pulmonary disease显示文摘 | Hjalmarsen A Waterloo K Dahl A | 1999 | Eur Neuro1999，42，： | 1 |
| 9 | GP-zones in A1-Zn-Mg alloys and their role in artificial aging 显示文摘 | BERG L K GJONNES J HANSEN V LI X Z WEDEL M K WATERLOO G SCHRYVERS D WALLENBERG L R | 2001 | Acta Materialia2001，49，： | 1 |
| 10 | Risk factors for aneurismal subarachnoid haemorrhage:the Tromso study显示文摘 | ISAKSEN J EGGE A WATERLOO | 2002 | Neurol-Neurosurg-Psychiatry2002，73，2： | 1 |
| 11 | Effect of vitamin D supplement on depression scores in people with low levels of serum 25-hydroxyvitamin D:nested case-control study and randomised clinical trial显示文摘 | Kjsergaard M Waterloo K Wang CE | 2012 | BrJ Psychiatry2012，201，5： | 1 |
| 12 | Prophylactic hyperdynam ic postope rative fluid therapy after aneurysm al subarachnoid hem orrhage:a clinical,prospective,random ized,controlled study显示文摘 | Egge A Waterloo K Sjoholm H | 2001 | Neurosurgery2001，49，3： | 1 |
| 13 | Structures and transformation during artificial aging of an industrial 7xxx series AI-Zn-Mg-Zr alloy 显示文摘 | HANSEN V STILLER K WATERLOO G GJONNES J LI X Z | 2002 | Mater Sci Forum2002，，： | 1 |
| 14 | Differential scanning calorimetry and electron diffraction investigation on low-temperature aging in A1-Zn-Mg alloys 显示文摘 | JIANG X J TAFTO J NOBLE B HOLME B WATERLOO G | 2004 | Metallurgical and Materials Transactions A2004，31，2： | 1 |
| 15 | GP-zones in Al–Zn–Mg alloys and their role in artificial aging显示文摘 | L.K Berg J Gj?nnes V Hansen X.Z Li M Knutson-Wedel G Waterloo D Schryvers L.R Wallenberg | 2001 | Acta Materialia2001，，17： | 1 |
| 16 | Differential scanning calorimetry and electron diffraction investigation on low-temperature aging in Al-Zn-Mg alloys显示文摘 | X. J. Jiang J. Tafto B. Noble B. Holme G. Waterloo | 2000 | Metallurgical and Materials Transactions A2000，，2： | 1 |
| 17 | GP-zones in Al-Zn-Mg alloys and their role in artificial aging显示文摘 | BERG L K GJФNNES J HANSEN V LI X Z KNUTSON-WEDEL M WATERLOO G SCHRYVERS D WALLENBERG L R | 2001 | Acta Mater2001，49，12： | 1 |
| 18 | Systematic review of the prevention of delayed isehemic neurological deficits with hyper- tension, hypervolcmia, and hemodilution thetapy following sub- arachnoid hemorrhage显示文摘 | Egge A Waterloo K Sjoholm H | 2003 | JNeurosurg2003，98，5： | 1 |
| 19 | 非线性连续介质力学中的“主轴法”显示文摘 | 郭仲衡 R.N.Dubey加拿大Waterloo大学 | 1983 | 力学进展1983，，03： | 1 |
| 20 | Reduced neumpsy- ehological test perforruance in asymptomatic carotid stenosis:theTrom- so Study显示文摘 | LMathiesen EB Waterloo K Joakimsen O | 2004 | Neurology2004，62，5： | 1 |
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