1947年12月,一艘从纽约开往卡塔赫纳的希腊定期远洋轮"桑特·壳拉拉号",发来了一条不寻常的消息:"撞死了一条人所不知的海洋动物."他们叫它"海蛇".

Mesoporous carbon nanosheets with high surface areas and large total pore volumes were prepared using tubular halloysite as inorganic matrix and furfuryl alcohol (FA) as carbon precursor by a template-like method. Field emission scanning electron microscope, high-resolution transmission electron microscopy (HRTEM) and nitrogen adsorption analysis were employed to characterize the morphologies and pore structures of the samples. It is found that tunable mesoporous carbons can be obtained by adjusting FA volume concentration. Lowering FA concentration leads to an increase in the BET specific surface area and narrowing of the mesopore size distribution.

<正>藏族人民普遍信仰藏传佛教,虔诚的心灵使他们创造了举世闻名、璀璨夺目的佛教艺术。唐卡更是以其轻便灵巧的形式、丰富多彩的内容、美轮美奂的风貌,深受藏族人民喜爱,这就使得它对藏族社会的发展、文化的促进、意识的导引和人格的

<正>在历史的长河中,人类创造了丰富的民间文艺和娱乐游戏活动,而文艺与娱乐游戏从某种程度上代表着人类的智慧与文化的发展。藏族作为人类大家庭中的一员,曾在历史上创造了灿烂的藏族文化。藏族文化博大精深、耐人寻味,具有独特的藏民

<正>雪域高原数千年来,中华文化和印度文化在此交融,传统文化与各兄弟民族文化在此交汇,使其艺术的历史长河积淀了源远流长而又深厚的优良文化传统。在这块被誉称为"歌舞海洋"的土地上,舞蹈艺术种类纷繁,形式多样,独具浓郁的民族特

<正>一、"祭祀"一词的含义阐释在藏语语境的当中"祭祀"基本由等几类词达意,其核心字是,因其有着两层意义上的概念阐释,故对于的概念界定就很难做综述概定,这两层意义分别是空性意念上的无上供奉和现实有形的实体献祭。但从

Mesoporous carbon nanosheets were synthesized using tubular halloysite, a kind of natural kaolinite, as inorganic matrix and furfuryl alcohol (FA) as carbon precursor by a template-like method. The inorganic mineral was removed by washing carbon–mineral mixture with HF and HCl. High-resolution transmission electron microscopy (HRTEM), field-emission scanning electron microscope (FE-SEM) and nitrogen adsorption analysis were employed to study the morphology and structure of the samples. A lot of mesopores on the carbon nanosheets can be observed clearly from the TEM and SEM images. The formation mechanism of sheet-like carbons was explored by using TEM and SEM images. The resultant carbons exhibit a high degree of mesoporosity (78–84%), high specific surface area (the largest is 1130m2g−1) and large total pore volumes (the largest is 2.32m3g−1). The study shows that the impregnation pressure and duration play an important role on the development of pore structure of the resultant carbons, such as specific surface areas and total pore volumes.

<正>《格萨尔》是举世文明的藏族长篇英雄史诗,是世界上最长的一部活形态的史诗。这样一部结构宏大、内容广博的伟大杰作从产生到现在已经近千年了,而且至今还在许多地区广为流传,它是怎样保

Porous carbons were prepared using zeolite ore and artificial type X zeolite as templates, and sucrose as carbon source. Field-emission scanning electron microscopy and nitrogen adsorption analysis were employed to study the morphologies and pore structure of the samples. Results indicate that the BET specific surface area of zeolite ore templated porous carbon (1070m(2)/g) is lower than that of type X zeolite templated porous carbon (1820 m(2)/g) while the total pore volume (1.39 cm(3)/g) and mesopore. volume (0.98 cm(3)/g) of porous carbon obtained using zeolite ore as the template are much larger than that of porous carbon obtained by using type X zeolite as the template, which are 1.02 cm(3)/g and 0.39 cm(3)/g respectively. The nanopores of natural zeolite templated porous carbon are composed of three kinds of pores: one is formed by removal of ore which means "templated pores", the second is inherited from template pores which we call "hereditary pores" and the third is formed during carbonization.

<正>为了充分展示近年来在自治区党委、政府的高度重视下,我区文化遗产保护工作诹得的可喜成果,当天上午由西藏自治区文化厅党组书

<正>久村卓"久村卓"(?)流传在西藏山南地区琼结县下水乡久村而得名。琼结县历史悠久名胜古迹众多,西藏第一座王墓,西藏最早的城堡,西藏噶厦政府的大宗(相当于现在的一个县)之一均在琼结县境内,还有传说中的西藏美女达瓦卓玛,而

<正>藏区素有"歌舞海洋"之美称,人们常说藏族人生下来会说话就会唱歌,会走路就会跳舞。而对生活在康区的康巴人来说这还不够,人们还会说康巴人说话就像唱歌,康巴人走路就像在跳舞。康巴人自已则说歌舞对康巴人就像雪山上的太阳和月亮,就像

<正>三、中国戏曲大体系中较为庞大的藏戏系统我国著名戏剧理论家曲六乙先生在《建立傩戏学引言》中曾指出:傩戏是具有世界普遍性的艺术现象,戏曲是中国所独有的艺术现象……不少地区的傩戏,由于长

Templated carbonization method has pioneered a new field in the preparation of porous carbon and become the most effective approach to controlling the structure of porous carbon in recent years.In this paper,the shortage of traditional method in the preparation of porous carbon is introduced,and the development of preparation of porous carbons by using silica gel,clay,zeolite and mesoporous silica as the temlate in carbonization is reviewed.The potential applications of templated carbons in the fields such as energy storage media,electric double-layer capacitor(EDLC)and catalyst support are also presented.Further research is to be done in the field of preparation of porous carbons by using the templated approach.

Carbons with narrow pore size distributions were synthesized by using natural zeolite as template and sucrose as carbon source.The samples were characterized by field emission scanning electron microscopy(FESEM),X-ray diffraction(XRD)and N2 adsorption.The effects of the amount of sulfuric acid during impregnation and the carbonization temperature on the structure of the porous carbons obtained were investigated.The results show that the amount of sulfuric acid and the heat-treatment temperature during preparation process are important factors that affect the structure and performance of resultant carbons.The excessive sulfuric acid amount could result in the impurity retained in resultant carbons,the specific surface area and total volume of porous carbons decrease and the surface texture become coarse and dense.While the higher heat-treatment temperature during carbonization,the more structure shrinks,larger total volumes and higher mesoporosity of porous carbons are.

On the basis of analysis of structure and properties, halloysite, a natural tubular mineral, was developed for an environmental treatment. TiO2 was mounted into halloysite by using hydrolysis of tetrabutyl titanate at room temperature. The adsorption and photocatalytic performance of halloysite and TiO2-mounted halloysite have been examined in methylene blue aqueous solution in the dark and under ultraviolet ray irradiation, respectively. Their performance of adsorption and photodecomposition was evaluated from the adsorbed and degraded amounts of methylene blue (MB). Due to the mixture of adsorption and photodecomposition, the concentration of MB, organic pollution, in water decreased rapidly with TiO2-mounted halloysite powder, which is a faster reaction than that with halloysite-only adsorption. This new use of halloysite is leading to many interesting applications in the decomposition and elimination of various pollutants in air and water.

Porous carbons rich in mesopores and with large pore volumes have been prepared by polymerization and carbonization of a carbon precursor, sucrose, within a matrix of the natural clay, halloysite. The carbon precursor was impregnated into the pores of halloysite and mostly deposited on the external surface of the halloysite rods during impregnation. The inorganic matrix was removed by washing the carbon-mineral composite with HF and HCl. The resultant carbons were characterized by nitrogen adsorption analysis and were found to possess a large specific surface area, a large total pore volume and significant mesoporosity, without an activation process being involved. The pore volume and mesoporosity were up to 1.86 cm 3 /g and 78%, respectively, even at low carbonization temperatures (500°C). The size of the mesopores of the resultant carbons is mainly between 3 and 30 nm and the dominant pore size is ∼3.7 nm. The carbonization temperature has significant effects on the pore-size distribution and structure of the resultant carbons and carbon-mineral composites, respectively. This process is relatively simple and expected to cost less than the high-temperature carbonization process in the preparation of mesoporous carbons with total pore volume and large specific surface areas.