ROUGH MULTIPLE SINGULAR INTEGRALS ALONG HYPERSURFACES

In this paper, the authors study the mapping properties of singular integrals on product domains with kernels in L(log+L)ε(Sm-1 × Sn-1) (ε = 1 or 2) supported by hyper-surfaces. The Lp bounds for such singular integral operators as well as the related Marcinkiewicz integral operators are established, provided that the lower dimensional maximal function is bounded on Lq(R3) for all q > 1. The condition on the integral kernels is known to be optimal

Wood Anatomy Characteristics of 6 Mangrove Species of Sonneratia and Their Application

应用光镜及扫描电镜对生长在热带、亚热带海岸潮间带的 6种海桑属红树植物的次生木质部进行了解剖学研究表明 :海桑属 6种红树植物的次生木质部具有导管直径小 ,导管分布频率高 ,复孔率高 ,导管壁厚和纤维壁较厚且具次生加厚 ,木薄壁组织缺乏或稀少等与环境相适应的特点。海桑属 6种红树植物的数量特征还表明 :海桑、无瓣海桑、卵叶海桑的木材可能适合造纸。The study reveals that the secondary xylem of 6 mangrove species of Sonneratia possesses the following characteristics:the diameter of vessel is small,the distribution frequency of vessel is high,the reperforating rate is high,the wall of vessel is thick,the wall of fibre is relatively thick and the wood parenchyma is short or sparse,whish is suitable with the environment.The quantitative feature of 6 mangrove species of Sonneratia also indicates that the wood of S.caseolaria,apetalous sonneratia and ovate-leaf sonneratia is probably suitable for paper-making.国家自然科学基金资助项目! (495 76 2 95

Stduy on Comparative Anatomy of Secondary Xylemin Six Sonneratia Species of Mangroves

应用光学显微镜、扫描电子显微镜和激光扫描共聚焦成像显微镜对海桑属 6种红树植物木材结构进行观测 .首次报道了海桑属植物具有纤维状导管分子 ,并对其生态学意义进行了讨论 .同时对其次生木质部的形态结构特征的共同点和不同点进行了总结和描述 ,以作为比较解剖学的依据 ,进一步讨论海桑属与红树植物其它属木材结构相异的原因 .对海桑属与同一科的八宝树属(Daubanga)木材结构进行比较倾向于支持海桑属和八宝树属应独立为同属一科的两族The morphological features of secondary xylem in six species of Sonneratia p lants were survered by means of optical microscope, scanning electronic microsco pe and laser scanning confocal microscope. Fibriform vessel elements in Sonner atia plants were first reported and their ecological significance was discusse d. Similarities of wood features in Sonneratia plants were represented as wo od comparative evidence for comparing it with other mangrove genera Bruguiera, Ceriops, Kandelia, Rhizophora, Avicennia, Aegiceras. The results showed that a few w ood features in Sonneratia were recognized to delimit it except for uniserat e rays. Comparison of wood anatomical features between Sonneratia and Daub anga , belonging to the same family, suggests that they are possibly treated as two separate tribes.国家自然科学基金资助项目 (4 95 762 95

Genetic diversity and differentiation of Aegiceras corniculatum populations in three different habitat

采用垂直板型聚丙烯酰胺凝胶电泳测定了三种不同生境的桐花树(Aegicerascorniculatum)种群的遗传多样性和遗传分化。桐花树种和种群水平都维持有较高的遗传变异性 ,观察杂合度分别为 0 .2 52和 0 .2 44,期望杂合度分别为0 .2 66、0 .2 40。种群间遗传分化系数为 0 .12 7,表明总的遗传变异中有 12 .7%来自种群间。种群间遗传距离和遗传一致度均值分别为 0 .0 60和 0 .964,基因流畅 ,Nm =2 .187。Genetic diversity and genetic differentiation of A.corniculatumpopulations in three different habitats were investigated using the assay of vertical slab polyacrylamide gel electrophoresis. The results showed that relatively high level of genetic diversity among species and population level was maintained. Observed heterozygosities at species and population level were 0.252 and 0.244 respectively, and expected heterozygosity were 0.266 and 0.240 respectively. The coefficient of gene differentiation between populations was 0.127, which showed that 12.7% of total heterozygosity came from inter population. The genetic distance and genetic identity between populations were 0.06 and 0.964 respectively. Gene flow was smooth, N m= 2.187.国家教育部博士学科点专项科研基金!资助项目(1999038410号

Genetic structure of Avicennia marina population in different habitats

本文研究了广西沙质土壤和淤泥质土壤白骨壤种群的遗传多样性和遗传分化 .结果表明 ,不同生境的白骨壤种群维持着较高的遗传多样性 ,观察杂合度为 0 .35 0 ,预期杂合度为 0 .2 5 9.不同生境的白骨壤种群的遗传分化很低 ,种群间的遗传分化为FST=0 .0 6 2 ,表明总的遗传变异中有 93.8%来自种群内 .基因流顺畅 ,Nm=3.78.种群间的遗传一致度和遗传距离分别为 0 .95 5和 0 .0 46The genetic variation and genetic differentiation were investigated in Avicennia marina populations in sandy soil and slity soil in Guangxi. It showed that Avicennia marina populatioin in different habitats maintained relatively high level of genetic variation, observed heterozygosity was 0.350, and expected heterozygosity was 0.259; genetic differentiation in Avicennia marina population in different habitats was low, F ST =0.062, which showed that among total heterozygosity, 93.8% came from intar populations, the genetic distance and genetic identity between population was 0.046 and 0.955 respectively, gene flow was smooth, which was 3.78.[WT5F1]国家教育部博士学科点专项科研基金资助项目!(19990 38410

埃及阿斯旺高坝的水生态学影响和纳赛尔水库的渔业

<正> 阿斯旺高坝是根据埃及——苏丹河流规划修建的,主要目的是灌溉和发电,坝顶高程180米。1902年时在阿斯旺曾建过一坝,现仍存在,称为老阿斯旺坝。新坝在老坝的上游6.5公里处,1960年动工,1964年开始蓄水,1968年竣工。高坝的建成使尼罗河成为世界上唯一的河水能全部控制和充分利用的大河。形成的水库在埃及境内的部分称为纳

Biochemical genetic analysis of allozymes of Haliotis discus discus and Haliotis discus hannai

应用聚丙烯酰胺凝胶电泳技术,对盘鲍(Haliotisdiscus discus　)和皱纹盘鲍(Haliotisdis-cushannai)的养殖群体进行了10种等位酶的电泳检测和谱带遗传分析。确定了盘鲍的18个等位酶位点及21个等位基因,单态位点有15个;　仅有3个位点是多态的,　它们是Sod-1,Est-3, -1(P0.99标准),多态位点的百分数为16.67%,　这些多态位点分析到2个等位基因。确 Mdh定了皱纹盘鲍的18个等位酶位点及20个等位基因,单态位点有16个;　仅有2个位点是多态的,它们是Sod-1,Est-3(P0.99标准),多态位点的百分数为11.11%,这些多态位点中也分析到2个等位基因。盘鲍和皱纹盘鲍在所有位点中共享大多数常见等位基因,　因此在生化遗传上它们非常相似。该研究揭示了盘鲍和皱纹盘鲍养殖群体等位酶位点及其等位基因带谱的变异式样,为盘鲍和皱纹盘鲍的遗传结构及遗传育种的研究提供了一批等位酶位点及其等位基因的参考图谱。Biochemical genetics was investigated using the assay of vertical slab polyacrylamide gel electrophoresis in Haliotis discus discus and H. discus hannai. Ten enzymes presumably encoded by 18 allozyme loci and 21 alleles are scored in H. discus discus, the monomorphic loci are Ldh-1,Adh-1,Sod-2,Est-1,Est-2,Mdh-2,Me-1,Idh- 1,Sdh-1,Aat-1,Aat-2,Aat-3,Amy-1,Amy-2,Amy-3; and 3 loci with two alleles are polymorphic being, Sod-1, -3, -1. The percentage of polymorphicloci(P0.99) is 16.67%. And ten enzymes presumably encoded by 18 Est Mdh allozyme loci and 20 alleles are scored in H. discus hannai, the monomorphic loci are Ldh-1,Adh-1,Sod-2,Est-1, Est-2,Mdh-1,Mdh-2,Me-1,Idh-1,Sdh-1,Aat-1,at-2,Aat-3,Amy-1,Amy-2,Amy-3, and 2 loci with two alleles are polymorphic, which are Sod-1,Est-3. The percentage of polymorphicloci(P0.99) is 11.11%. H. discus discus and H. discus hannai shared most of common alleles in all loci, Therefore they are very similar in biochemical genetic. This study revealed the basic genetic diversity and genetic structure of H. discus discus and H. discus hannai and provided comparable diagrams of allozymes for the researchers in this field.国家自然科学基金资助项目(30231013);; 福建省自然科学基金资助项目(B0110036

关于葛洲坝水利枢纽对长江鱼类资源的影响和保护鲟鱼资源的意见

<正> 葛洲坝枢纽是在长江干流上修建的第一座水利工程,也是三峡水利枢纽的一个组成部分,规模巨大,举世瞩目。枢纽建成以后,将改变大坝所在江段的自然面貌,引起生态环境的某些变化。这些变化及其所产生的生态效应,特别是反映在栖息于长江中的一些鱼类和其他水生生物的种群数量的变化,引起了渔业科学工作者极大的关注。自五十年代关于兴建三峡水利枢纽的

葛洲坝枢纽下游中华鲟自然繁殖的调查

<正> 中华鲟是一种大型的洄游性鱼类,最大个体达1,100余斤。成熟个体原来由海进入江河,性腺逐渐发育,至翌年秋季在长江上游产卵繁殖。1981年1月,葛洲坝枢纽大江截流,中华鲟的洄游路线受阻,而滞留平坝下江段。在这种情况下,中华鲟的性腺能否继续发育和有无可能在大坝下游自然繁殖的问题,通过两年来的调查研究,已经得到了肯定的回答

An Energy Band Design for p-Type Tensile Strained Si/SiGe Quantum Well Infrared Photodetectors

提出p型张应变Si/SiGe量子阱红外探测器(QWIP)结构,应用k.p方法计算应变Si/SiGe量子阱价带能带结构和应变SiGe合金空穴有效质量.结果表明量子阱中引入张应变使轻重空穴反转,基态为有效质量较小的轻空穴态,因此p型张应变Si/SiGe QWIP与n型QWIP相比具有更低的暗电流;而与p型压应变或无应变QWIP相比光吸收和载流子输运特性具有较好改善.在此基础上讨论了束缚态到准束缚态子带跃迁型张应变p-Si/SiGe QWIP的优化设计.Quantum well infrared photodetectors(QWIPs)offer numerous potential applications for defense,industry,and medicine.A novel p-type tensile strained Si/SiGe QWIP is proposed in this paper.The valence band structure of the strained Si/SiGe quantum well and hole effective mass of the strained SiGe alloy are calculated using the k·p method.When tensile strain is induced in the quantum wells,the light-hole state with small effective mass becomes the ground state,which is expected to have lower dark current than n-type QWIPs and also have larger absorption coefficient and better transport characteristics than conventional unstrained or compressive strained p-type QWIPs.Designs for p-type tensile strained Si/SiGe QWIP based on the bound-to-quasi-bound transitions are also discussed.国家自然科学基金(批准号:50672079,60336010,60676027);; 国家重点基础研究发展规划(批准号:2007CB613400)资助项目~