[Study on artificial compound feed for Buthus martensii].

Objective: To solve the problem that the single feed causing malnutrition, extension of the life cycle and low survival rates of Buthus martensii.

Methods: By using Minitab (R) 15.1.

[Study on spatial distribution pattern and seasonal distribution of Buthus martensii in yan'an].

Objective: To study population dynamics of Buthus martensii and its wild spatial distribution pattern in Yan'an.

Methods: Every month, the 1st, 10th and 20th day were designated to collect Buthus martensii samples and count on the collection by using expansion pattern target, Taylor power law and Lwao m-x regression analysis.

Results: Taylor power law regression equation was Ig S2 = 1.

[Investigation on emission characteristics of methanol vehicle's aldehyde and ketone pollutants].

Investigation on the character and quantity of aldehydes and ketones emitted from methanol vehicle was implemented respectively by using high performance liquid chromatograph (HPLC) method. Experiments of vehicles equipped with and without three-way catalyst (TWC) under transient and steady mode were carried out. The emission results were compared with that of gasoline vehicle.

[Experimental study on characteristics of biodiesel exhausted particle].

A particle emission experiment of a direct-injection turbocharged diesel engine with biodiesel and diesel was carried out. A pump of 80 L/min and fiber glass filters with diameter of 90 mm was used to sample engine particles in exhaust pipe. The size distribution, soluble organic fraction (SOF) and 16 polycyclic aromatic hydrocarbons (PAHs) of particles were analyzed by a laser diffraction particle size analyzer and GC-MS.

[Experimental study on particle size distributions of an engine fueled with blends of biodiesel].

The purpose of this study is to obtain the particle size distributions of an engine fueled biodiesel and its blends. A turbocharged DI diesel engine was tested on a dynamometer. A pump of 80 L/min and fiber glass filters with diameter of 90 mm were used to sample engine particles in exhaust pipe.

[Preparation of biodiesel from waste edible oils and performance and exhaust emissions of engines fueled with blends of the biodiesel].

The purpose of this study is to evaluate the effect of biodiesel on environment and to investigate the effect of the biodiesel made of waste edible oils on the performance and emissions of engines. Life cycle assessment (LCA) of biodiesel and diesel was introduced and the results of the LCA of both the fuels were given. The technological process of biodiesel production from waste edible oils, which is called transesterification of waste oils and methanol catalyzed with NaOH, was presented.