Study on Preparation of Cathode Material of Lithium Iron Phosphate Battery by Self-Craning Thermal Method

The cathode material of carbon-coated lithium iron phosphate(LiFePO4/C)lithium-ion battery was synthesized by a self-winding thermal method.The material was characterized by X-ray diffraction(XRD)and scanning electron microscope(SEM).The electrochemical properties of LiFePO4/C materials were measured by the constant current charge-discharge method and cyclic voltammetry.The results showed that the LiFePO4/C material prepared by the self-propagating heat method has a typical olivine crystal structure,and the product had fine grains and good electrochemical properties.The optimal sintering temperature is 700℃,the sintering time is 24 h,the particle size of the lithium iron phosphate material is about 300 nm,and the maximum discharge capacity is 121 mAh/g at 0.1 C rate.

The Influences and Measures on Children of Family Language Policy in Autocratic Family

As the smallest unit of social group, family language policy(FLP) plays a guide role, such as its making, implementationand evaluation are influenced among the family members and children’s grow-up. However, parents who are in remote area thinkonly under their FLP can children obey them and be protected well. But the reality is that FLP in autocratic family has bad influence on children because of lacking science. In terms of the research on FLP, this thesis tries to analyze the effect and measures ofFLP in autocratic family on kids in remote rural areas according to language acquisition, intergenerational differences and bilingualinfluences which come from different writers or articles.

Evaluation of Heavy Metal Concentrations in Soil and Edible Vegetables Grown in Compost from Unknown Sources in Al-Jiftlik, Palestine

The use of compost as a fertilizer has been widely used in many countries. However, compost that contains heavy metals can transfer these metals to soils and plants (vegetables). This study investigates the concentrations of metals in soil and edible vegetables that were fertilized by polluted unknown compost in Al-Jiftlik region (Palestine). The source of the compost is the autocratic dumping sites of the Israeli settlements. The compost is distributed free of charge to the Palestinian farmers. The concentrations of Ba, Cu, Pb, Th, Se, Mn, Co and As in the contaminated farms were measured. Vegetables include: Eggplant, Corn, Bell Pepper, Cucumber and Marrow. Metals availability as well as the pH, was also examined in the soil samples. Normal farms that did not use this unknown compost were used as a reference. The concentrations of Ba, Cu, Pb, Th, Se, Mn, Co and As in soil and vegetables in the polluted farms were above the WHO limits. Barium concentrations in the vegetables were ranged from 1.00 mg/kg to 0.453 mg/kg. It is high when compared to WHO limit of 0.3 mg/kg. Copper concentrations in the vegetables were ranged from 63.84 mg/kg to 50.53 mg/kg. It is high when compared to WHO limit of 40 mg/kg. Lead concentrations in the vegetables were ranged from 1.00 mg/kg to 0.453 mg/kg. Lead concentration is high when compared to WHO limit of 0.3 mg/kg. Thallium concentrations in the vegetables were ranged from 2.99 mg/kg to 1.22 mg/kg. Thallium concentration is high when compared to WHO limit of 0.3 mg/kg. Selenium concentrations in the vegetables were ranged from 0.550 mg/kg to 0.348 mg/kg. It is high when compared to WHO limit of 0.3 mg/kg. Manganese concentrations in the vegetables were ranged from 825.3 mg/kg to 446.2 mg/kg. It is almost high when compared to WHO limit of 500 mg/kg. Cobalt concentrations in the vegetables were ranged from 1.119 mg/kg to 0.522 mg/kg. Cobalt concentration is high when compared to WHO limit of 0.1 mg/kg. Arsenic concentrations in the vegetables were ranged from 4.306 mg/kg to 0.662 mg/kg. It is high when compared to WHO limit of 0.2 mg/kg. On the other hand, all metals concentrations in the clean farms were below the WHO limits. The study had recommended preventing farmers from using this unknown compost.

赶走Autocrat

前不久网友传给我一个工具软件，但在使用的过程中觉得不对劲。经分析发现其中捆绑了“Autocrat”服务端(中文名“独裁者“)。“Autocrat”是一款很强劲的DoS(Denial of service)攻击工具，为保证系统安全，我决定手工清除“Autocrat”服务端。