两词在林比不上一词在手——谈谈发挥学生学习词汇的主动性

本文所介绍的是在ESL高级阶段普通词汇教学中采用的一个实验性方法。这项方法在某些方面是受了Haggard的“词汇自我收集法”(Vocabulary Self Collection Strategy)的影响。但是,笔者所关注的是确立一项词汇选择原则,以防止随机收集的低效率和盲目性。我认为,真是这个原则使我所介绍的方法具有可行性。

今年林林几岁

[题目]明明今年2岁,三年后林林比明明大4岁,今年林林几岁?

二安替比林甲烷光度法测定工业硅中钛

用氢氟酸加硝酸溶解样品 ,加高氯酸氧化还原性物质 ,在盐酸介质中二安替比林甲烷光度法测定工业硅中的钛 ,方法简便 ,结果可靠。回收率 :95 %～ 1 0 4 % ,RSD :1 5 %

Variation of SPAD values in uneven-aged leaves of different dominant species in Castanopsis carlessi forest in Lingshishan National Forest Park

The greenness （SPAD） of uneven-aged leaves of dominant species in the Castanopsis carlessi forest at different altitude gradients in Lingshishan National Forest Park, Fujian Province, China were measured by using portable chlorophyll meter SPAD-502. In addition, the correlation between SPAD value and the concentration of chlorophyll and foliar nitrogen was also investigated. Significant variations in SPAD values were found between the uneven-aged leaves of different dominant species and different altitude gradients. Regression analysis showed that SPAD value was significantly correlated with the concentration of chlorophyll and the content of foliar nitrogen, indicating that SPAD value could be indicators for foliar chlorophyll and nitrogen. It is suggested that SPAD meter is a useful tool for forest assessments in decision-making and operational nutrient management programs.

Preparation of TiO_2/ITO film by liquid phase deposition and its photoelectrocatalytic activity for degradation of 4-aminoantipyrine

A thin layer of TiO2 film was deposited on ITO surface via the liquid phase deposition （LPD） process. The photocurrent and electrochemical impedance spectroscopy （EIS） measurements indicated that the as-prepared LPD TiO2/ITO film had an excellent photoelectrochemical performance, which showed a sensitive and rapid response to the UV irradiation. The photogenerated electron-hole pairs could be effectively separated by applying an external bias to the TiO2 film electrode. The LPD TiO2/ITO film was employed to study the photoelectrocatalytic （PEC） degradation of 4-aminoantipyrine. Compared with other techniques, the PEC technique based on such a LPD film electrode had a synergetic effect for 4-aminoantipyrine degradation. When the applied bias potential was＋0.8 V and the supporting electrolyte concentration of Na2SO4 was 0.1 mol/L, the highest degradation efficiency within 120 min could reach 95%for 0.1 mmol/L 4-aminoantipyrine solution at pH 2.0.

《林海》教案

教学要求1.体会祖国山河的壮丽及林海对“兴国安邦”的意义。2.学会本课生字词,有感情地朗读课文。3.了解作者抓住大兴安岭景色的特点.加以细致描写和在字里行间抒发感情的写作特点。4.

population用法小结

population 这个词在高中英语第一册学过,其含义是“人口”,其用法要注意以下几点:一、表示某个地区的人口时,其前应受定冠词修饰。如:the population of the earth,the population of China 而不说 a populationof the earth,a population of China二、表示人口的数目时,其前应受不定冠词修饰。如:

自信是最好的口才

格林是一个孤独的孩子,他没有朋友,他每天独来独往,不跟任何人说话。格林的父母听老师说他在学校很孤单,上课也从来不回答问题,从来不跟同学交流,成绩一直上不去。父母很为格林担忧,不知道这孩子是怎么了。于是,父母把格林送到医院去检查,检查的结果是格林没有任何疾病。父母束手无策,更加忧心,这可怎么办啊？

马褂木叶蜂生物学及其防治研究

马褂术叶蜂是马褂木的主要害虫,萍乡和铜鼓一年发生一代。以老熟幼虫在土中作土室变预蛹越冬,翌年4月上旬开始化蛹,4月中旬开始羽化。5月上旬出现幼虫。幼虫23天就开始入土越冬。

多用磨浆机磨浆不良巧排除

冬春正值豆类,薯类加工制粉的高峰时节,多用磨浆机由于连续工作,磨浆中常会出现一些故障,必须立即排除。 磨浆粗糙 原因是砂轮磨损大或砂轮间隙大。排除方法:砂轮因使用时间过长,造成轮齿磨平不锋利,此时应及早更换砂轮。如果是砂轮间隙太大,

简讯

1.由福建省柴炭公司承担的省重点科研项目“毛竹林丰产结构试验研究”,在建阳县华家山毛竹采育场经过8年的试验研究,已基本完成。于不久前由省科委主持,召开有南林大周芳纯教授、福建省林科所所长林杰教授等省内外30多位竹类专家参加的技术鉴定会,与会专家对该试验研究给予一致肯定。 2.林业部委托江西省林业厅对林业部下达给江西省奉新县林业局重点推广项目“低产毛竹林改造技术示范林”5500亩,进行了现场验收鉴定。测定示范林比改造前平均亩增新竹1 179.3公斤,亩增产值284.7元,共增产值1608 868.17元。

辽西地区混交林的主要作用及营造技术

在低山丘陵地区实施森林营造中,混交林与单一林比较,不仅能够增强对森林区域空间资源的更合理利用,同时也对森林土壤营养水平的提高具有十分重要的作用。因此营造人工混交林,是位于辽宁省西部低山丘陵地区的重点林业工作。为了促进辽西地区混交林的规模与区域,笔者对混交林的主要作用进行了分析,提出了混交林造林的主要技术与方法。1辽西地区营造混交林造林的主要作用1.1有效的利用了森林土壤的营养空间。

Spatial pattern of dominant tree species of the secondary monsoon rain forest in Lianjiang, Guangdong Province

Based on the summed dominance ratios of species in sample plots, the first three dominant species (Litchi chinensis, Elaeocarpus sylvestris and Canarium album) of the secondary monsoon rain forest of Mt. Royal Shoe in Lianjiang City, western Guangdong, were chosen for analyzing their spatial distribution pattern with the analysis methods such as frequency models of Poisson Distribution, Two Negative Items Distribution, Neyman Distribution, aggregate indexes, Taylor exponential equation and Iwao’s equation modeling. The results showed that these three species distributed in the congregate spatial pattern. Litchi chinensis and Elaeocarpus sylvestris had the characteristic of basic congregate population and attractive characteristic between their plants. The patterns for Canarium album may change and become more evenly distributed with the increase of density. The overall species spatial pattern also depended on the conservation of the secondary monsoon rain forest besides it was affected by the species reproduction characteristics and its growing environment. The congregate spatial patterns of three dominant species showed that it is important to conserve forest urgent conservation of the forest.

Comparative Advantage of Maize Production in Jilin Province

The comparative advantage of maize production in Jilin Province was analyzed based on the sow area index,unit yield index,benefit index and comprehensive comparative advantage index in this study.The results showed that compared with other provinces in China,there was obvious comparative advantage in sow area index and unit yield index of maize in Jilin,the average of which stood for the first and the fourth in China from 2002 to 2006;there was no comparative advantage of benefit index compared with the average value of the whole countries,the average of which stood for the 14th in China from 2002 to 2006;the comprehensive comparative advantage in Jilin provincial maize production showed significant comparative advantage,the average of which stood for the fourth in China from 2002 to 2006.On the basis of the above,the suggestions to develop maize production in Jilin province had been put forward.

Soil Physical and Chemical Properties of Five Subtropical Forests in Lingao of Hainan

With 5 types of typical forests as research object, the physical and chemical properties of different types of forests were analyzed by sample plot investigation method. The results showed that： the soil total porosity was the highest in the Casuarina equisetifolia forest （46.168%）, but the lowest in the Encalyptus robusta forest （39.46%）. The soil capillary porosity was the highest in the Acacia mangium forest （22.57%）, but the lowest in the secondary forest （18.95%）. The soil water content was the highest in the C. equisetifolia forest, with a mean value of 27.85%, but the lowest in the secondary forest, with a mean value of 4.34%. The soil pH values were in the range of 4.81-6.59, the soils in the A. mangium forest, C. equisetifolia forest and E. robusta forest were strongly acidic （pH 4.5-5.5）, and the soils in the secondary forest and C. nucifera forest were weakly acidic. The soils had organic matter contents in the range of 0.34-28.68 g/kg, and showed an order of A. mangium forest〉C. equisetifolia forest〉E. robusta forest〉secondary forest〉C. nucifera forest, with a decreasing trend with the soil depth increasing. The soil total N contents were in the range of 0.10-1.63 g/kg, the A. mangium forest showed the highest soil total N contents, while the C. nucifera forest exhibited the lowest soil total N contents; the soil total P contents were in the range of 0.21-1.74 g/kg, and the E. robusta forest had the highest soil total P contents; and the soil total K contents were in the range of 0.16-2.15 g/kg, and the A. mangium forest exhibited the highest soil total K contents. The soil available P contents were in the range of 0.98-132.46 mg/kg; and the secondary forests had the highest soil available P contents; and the soil rapidly available K contents were in the range of 3.03-27.35 mg/kg, and the C. nucifera forest exhibited the highest soil rapidly available K contents. The soil ammonium N contents were in the range of 1.38-5.15 mg/kg, and the nitrate N contents were in the range were in the range of 0.56 -3.51 mg/kg. The A. mangium forest showed the highest soil nitrate N contents （with a mean value of 2.29 mg/kg） and ammonium N contents （with a mean value of 3.93 mg/kg）. For the same forest type, with the increase of soil depth, the nitrate nitrogen and ammonium nitrogen content also showed a decreasing trend.

Triple, standard quadruple and ampicillin-sulbactam-based quadruple therapies for H pylori eradication:A comparative three-armed randomized clinical trial

AIM： To compare the effectiveness of triple, standard quadruple and ampicillin-sulbactam-based quadruple therapies for Hpylori eradication in a comparative three-armed randomized clinical trial. METHODS： A total of 360 H pylori-positive patients suffering from dyspepsia and aging 24-79 years with a median age of 42 years were enrolled in the study and randomly allocated into the following three groups： group A （n = 120） received a standard 1-wk triple therapy （20 mg omeprazole b.i.d., 1000 mg amoxicillin b.i.d., 500 mg clarithromycin b.i.d.）, group B （n = 120） received a 10-d standard quadruple therapy （20 mg omeprazole b.i.d., 1000 mg amoxicillin b.i.d., 240 mg colloidal bismuth subcitrate b.i.d., and 500 mg metronidazole b.i.d.）, group C （n = 120） received the new protocol, i.e. 375 mg sultamicillin （225 mg ampicillin plus 150 mg sulbactam） b.i.d. （before breakfast and dinner）, instead of amoxicillin in the standard quadruple therapy for the same duration. Chi-square test with the consideration of P 〈 0.05 as significant was used to compare the eradication rates by intention-to-treat and per-protocol analyses in the three groups.RESULTS： The per-protocol eradication rate was 91.81% （101 patients from a total of 110） in group A, 85.84% （97 patients from a total of 113） in group B, and 92.85% （104 patients from a total of 112） in group C. The intention-to-treat eradication rate was 84.17% in group A, 80.83% in group B, and 86.67% in group C. The new protocol yielded the highest eradication rates by both per-protocol and intention-to-treat analyses followed by the standard triple and quadruple regimens, respectively. However, the differences were not statistically significant between the three groups. CONCLUSION： The results of this study provide further support for the equivalence of triple and quadruple therapies in terms of effectiveness, compliance and sideeffect profile when administered as first-line treatment for H pylori infection. Moreover, the new protocol using ampicillin-sulbactam instead of amoxicillin in the quadruple regimen is a suitable first-line alternative to be used in regions with amoxicillin-resistant Hpylori strains.

Could quantitative liver function tests gain wide acceptance among hepatologists?

It has been emphasized that the assessment of residual liver function is of paramount importance to determine the following： severity of acute or chronic liver diseases independent of etiology; long-term prognosis; step-bystep disease progression; surgical risk; and efficacy of antiviral treatment. The most frequently used tools are the galactose elimination capacity to asses hepatocyte cytosol activity, plasma clearance of indocyanine green to assess excretory function, and antipyrine clearance to estimate microsomal activity. However, a widely accepted liver test （not necessarily a laboratory one） to assess quantitative functional hepatic reserve still needs to be established, although there have been various proposals. Furthermore, who are the operators that should order these tests？ Advances in analytic methods are expected to allow quantitative liver function tests to be used in clinical practice.

Crystal Structure and Geometry-Optimization Study of N-(2-hydroxy-1-naphthaldene)-4-aminoantipyrine

N-（2-hydroxy-l-naphthaldene）-4-aminoantipyrine has been synthesized. The structure is determined by X-ray diffraction method and elemental analysis. The crystal system belongs to orthorhombic space group P（2）2（1）2（1）. The geometry has been ob- tained from the density functional theory （DFT） method and the B3LYP method employing the 6-31G^＊ basis sets. The calculated results propose that the latter is close to the experimental data. The structural parameters from the theory are close to those of the crystal and the calculated total energy of coordination is -31677.172 eV. The energy of HOMO and LUMO and the energy gap are 5.179 eV, -1.603 eV and 3.577 eV, respectively.