The C4R4 and Li4R4 type molecules which have come into notice recently have a distinctive tetrahedral configuration （see Fig. 1）. Their syntheses and specific properties have been reported by many authors. We were i...The C4R4 and Li4R4 type molecules which have come into notice recently have a distinctive tetrahedral configuration （see Fig. 1）. Their syntheses and specific properties have been reported by many authors. We were interested in studying the展开更多
Study on the chemical properties of Ce （Ⅳ） complexes has been quite limited so far. We have first reported that Ce （Ⅳ） is reduced completely to Ce （Ⅲ） when （C5H6N）2CeCl6 reacts with C5Me5Li. In order to und...Study on the chemical properties of Ce （Ⅳ） complexes has been quite limited so far. We have first reported that Ce （Ⅳ） is reduced completely to Ce （Ⅲ） when （C5H6N）2CeCl6 reacts with C5Me5Li. In order to understand the characteristics of this type of reaction, we have studied the reaction of another Ce （Ⅳ） complex, （HP（C2H5）3）2CeCl6,展开更多
A new technique for the synthesis of carbon nanotubes from coal is introduced in this paper. In this process, coal is selected as the raw material to injected into plasma jet directly, nanotubes are formed on the reac...A new technique for the synthesis of carbon nanotubes from coal is introduced in this paper. In this process, coal is selected as the raw material to injected into plasma jet directly, nanotubes are formed on the reactor wall. The metal elements contained in parent coal such as Cu, Al act as the catalyst. This technique is different from the traditional arc discharge process and has the advantages of easy and steady operation and low cost of raw material, so it is an attractive process.展开更多
Since the pioneer work of Thorsteinson fot me ox（?） ethane, a series of V-Mo based catalysts mainly for the oxidative dehydrogenation of ethane have been patented. On the surfaces of these catalysts, a C;H;selectivi...Since the pioneer work of Thorsteinson fot me ox（?） ethane, a series of V-Mo based catalysts mainly for the oxidative dehydrogenation of ethane have been patented. On the surfaces of these catalysts, a C;H;selectivity of 70％ was achieved, but the space velocity was only about 340 h;. Lunsford, et al. reported a C;H;conversion of 75％ and a C;H;selectivity of 76％ over the展开更多
Dogtooth tuna,Gymnosarda unicolor were sampled off the east coast of Australia(southwest Pacific Ocean)from 2007 to 2012.Ages were determined by examining thin transverse sections of their sagittal otoliths and were b...Dogtooth tuna,Gymnosarda unicolor were sampled off the east coast of Australia(southwest Pacific Ocean)from 2007 to 2012.Ages were determined by examining thin transverse sections of their sagittal otoliths and were based on counts of alternating opaque and translucent zones(annual growth increments).Growth was rapid during the first year of life,after which growth in length was much reduced.Parameters of the constrained von Bertalanffy growth function(fork length-at-age)were L∞=1164.77(mm,FL)and K=0.44 year^(-1).Preliminary estimates of longevity indicate a maximum observed age of at least 20 years.There was a high degree of variation in the observed length and age of sexual maturity for G.unicolor.Despite this variation,the size at 50%maturity for female G.unicolor estimated in this study was 713 mm FL(<2 years of age).The diet of G.unicolor is very broad and covers a range of fish species.The life history characteristics of G.unicolor overall,indicate that this species may be somewhat resilient to fishing.However,reports of localised depletions,in association with heavy targeting by sports fishers,low effective population sizes and patchy recruitment indicate that this species is particularly vulnerable to overfishing.展开更多
Ⅰ. INTRODUCTION AND RESULT Let H be a Hilbert space with its inner product （· , ·） and norm ‖·‖. Let etA be a C0-semigroup on H with the infinitesimal generator A and
A new family, Sinaglaspidae f.n., has been discovered in the greyish-black mudstone of the lower part of the Shanxi Formation (Upper Carboniferous, C3（?）2) in Gancaoshan of Xiangning County, Shanxi Province. The dis...A new family, Sinaglaspidae f.n., has been discovered in the greyish-black mudstone of the lower part of the Shanxi Formation (Upper Carboniferous, C3（?）2) in Gancaoshan of Xiangning County, Shanxi Province. The discovery is of significance in that: （ⅰ） the Aglaspida-bearing deposit展开更多
Recently, Sun Yongsheng considered the approximation constant for the Cesàro means. The author gave the approximation constant for the typical means about the subclass of f（x）∈C2π under C norm. Now
The crystal structures of two isomorphic cluster compounds, （C5H7S2）[Mo3-（μ3-O）（μ-Cl）3 （μ-OAc）3Cl3] and （C5H2S2）[Mo3 （μ3-O）（μ-Br）3 （μ-OAc）3Cl3] have been investigated. The compounds have been pre...The crystal structures of two isomorphic cluster compounds, （C5H7S2）[Mo3-（μ3-O）（μ-Cl）3 （μ-OAc）3Cl3] and （C5H2S2）[Mo3 （μ3-O）（μ-Br）3 （μ-OAc）3Cl3] have been investigated. The compounds have been prepared by similar procedures, with the exception that the former has used MoCl3 as the starting material,展开更多
Let X<sub>1</sub>,… X<sub>n</sub> be ⅰ. ⅰ. d. samples drawing from a general truncated familydP<sub>θ</sub>（x） =f（x; θ<sub>1</sub>, θ<sub>2</sub>）...Let X<sub>1</sub>,… X<sub>n</sub> be ⅰ. ⅰ. d. samples drawing from a general truncated familydP<sub>θ</sub>（x） =f（x; θ<sub>1</sub>, θ<sub>2</sub>）I（θ<sub>1</sub>≤x≤θ<sub>2</sub>）dx, -∞【θ<sub>1</sub>【θ<sub>2</sub>【∞, （1）where f is unknown density on [θ<sub>1</sub>, θ<sub>2</sub>]. In order to estimate linear function g（θ）= c<sub>1</sub>θ<sub>1</sub>+c<sub>2</sub>θ<sub>2</sub>,展开更多
Ⅰ. INTRODUCTION Let f（x）∈C[-1, 1] and let -1<xn<xx-1<…<x1<1 be the zeros of Legendre polynomial Pn（x） of degree n. It is well known that Hermite-Fejer and quasi Hermite-Fejer interpolation polyno...Ⅰ. INTRODUCTION Let f（x）∈C[-1, 1] and let -1<xn<xx-1<…<x1<1 be the zeros of Legendre polynomial Pn（x） of degree n. It is well known that Hermite-Fejer and quasi Hermite-Fejer interpolation polynomials based on {xk}kn=1 are,展开更多
文摘The C4R4 and Li4R4 type molecules which have come into notice recently have a distinctive tetrahedral configuration （see Fig. 1）. Their syntheses and specific properties have been reported by many authors. We were interested in studying the
文摘Study on the chemical properties of Ce （Ⅳ） complexes has been quite limited so far. We have first reported that Ce （Ⅳ） is reduced completely to Ce （Ⅲ） when （C5H6N）2CeCl6 reacts with C5Me5Li. In order to understand the characteristics of this type of reaction, we have studied the reaction of another Ce （Ⅳ） complex, （HP（C2H5）3）2CeCl6,
文摘A new technique for the synthesis of carbon nanotubes from coal is introduced in this paper. In this process, coal is selected as the raw material to injected into plasma jet directly, nanotubes are formed on the reactor wall. The metal elements contained in parent coal such as Cu, Al act as the catalyst. This technique is different from the traditional arc discharge process and has the advantages of easy and steady operation and low cost of raw material, so it is an attractive process.
文摘Since the pioneer work of Thorsteinson fot me ox（?） ethane, a series of V-Mo based catalysts mainly for the oxidative dehydrogenation of ethane have been patented. On the surfaces of these catalysts, a C;H;selectivity of 70％ was achieved, but the space velocity was only about 340 h;. Lunsford, et al. reported a C;H;conversion of 75％ and a C;H;selectivity of 76％ over the
文摘Dogtooth tuna,Gymnosarda unicolor were sampled off the east coast of Australia(southwest Pacific Ocean)from 2007 to 2012.Ages were determined by examining thin transverse sections of their sagittal otoliths and were based on counts of alternating opaque and translucent zones(annual growth increments).Growth was rapid during the first year of life,after which growth in length was much reduced.Parameters of the constrained von Bertalanffy growth function(fork length-at-age)were L∞=1164.77(mm,FL)and K=0.44 year^(-1).Preliminary estimates of longevity indicate a maximum observed age of at least 20 years.There was a high degree of variation in the observed length and age of sexual maturity for G.unicolor.Despite this variation,the size at 50%maturity for female G.unicolor estimated in this study was 713 mm FL(<2 years of age).The diet of G.unicolor is very broad and covers a range of fish species.The life history characteristics of G.unicolor overall,indicate that this species may be somewhat resilient to fishing.However,reports of localised depletions,in association with heavy targeting by sports fishers,low effective population sizes and patchy recruitment indicate that this species is particularly vulnerable to overfishing.
基金Project supported by the National Natural Science Foundation of China
文摘Ⅰ. INTRODUCTION AND RESULT Let H be a Hilbert space with its inner product （· , ·） and norm ‖·‖. Let etA be a C0-semigroup on H with the infinitesimal generator A and
文摘A new family, Sinaglaspidae f.n., has been discovered in the greyish-black mudstone of the lower part of the Shanxi Formation (Upper Carboniferous, C3（?）2) in Gancaoshan of Xiangning County, Shanxi Province. The discovery is of significance in that: （ⅰ） the Aglaspida-bearing deposit
文摘Recently, Sun Yongsheng considered the approximation constant for the Cesàro means. The author gave the approximation constant for the typical means about the subclass of f（x）∈C2π under C norm. Now
文摘The crystal structures of two isomorphic cluster compounds, （C5H7S2）[Mo3-（μ3-O）（μ-Cl）3 （μ-OAc）3Cl3] and （C5H2S2）[Mo3 （μ3-O）（μ-Br）3 （μ-OAc）3Cl3] have been investigated. The compounds have been prepared by similar procedures, with the exception that the former has used MoCl3 as the starting material,
基金Project supported by the National Natural Science Foundation of China
文摘Let X<sub>1</sub>,… X<sub>n</sub> be ⅰ. ⅰ. d. samples drawing from a general truncated familydP<sub>θ</sub>（x） =f（x; θ<sub>1</sub>, θ<sub>2</sub>）I（θ<sub>1</sub>≤x≤θ<sub>2</sub>）dx, -∞【θ<sub>1</sub>【θ<sub>2</sub>【∞, （1）where f is unknown density on [θ<sub>1</sub>, θ<sub>2</sub>]. In order to estimate linear function g（θ）= c<sub>1</sub>θ<sub>1</sub>+c<sub>2</sub>θ<sub>2</sub>,
基金Project supported by the Science Fund of Academia Sinica
文摘Ⅰ. INTRODUCTION Let f（x）∈C[-1, 1] and let -1<xn<xx-1<…<x1<1 be the zeros of Legendre polynomial Pn（x） of degree n. It is well known that Hermite-Fejer and quasi Hermite-Fejer interpolation polynomials based on {xk}kn=1 are,
