An Epsilon Half Normal Slash Distribution and Its Applications to Nonnegative Measurements

We introduce a new class of the slash distribution using the epsilon half normal distribution. The newly defined model extends the slashed half normal distribution and has more kurtosis than the ordinary half normal distribution. We study the characterization and properties including moments and some measures based on moments of this distribution. A simulation is conducted to investigate asymptotically the bias properties of the estimators for the parameters. We illustrate its use on a real data set by using maximum likelihood estimation.

Impact of slash disposal on soil and water loss and the growth of planted seedlings

The three methods of slash disposal in this experiment were no treatment, strip piling and burning. The results obtained from this study showed that the soil erosion, water and nutrient loss were higher in the logged areas by burning than in the logged areas by no treatment and strip piling. The soil and water loss was not serious when the slope degree of the logged area was less than 16o. The survival rate of planted seedlings was higher and the growth was better in the logged areas followed by burning than in the logged areas by no treatment and strip piling. Burning should not be used when the slope was more than 23o.

Radial growth and non-structural carbohydrate partitioning response to resin tapping of slash pine(Pinus elliottii Engelm.var.elliottii)

Slash pine(Pinus elliottii Engelm.var.elliottii)is a resin-producing species grown worldwide for significant economic benefits for wood production.Resin tapping cre-ates a carbon sink at the expense of carbon allocation for growth and consequently,wood production may be reduced.Non-structural carbohydrates comprising starch and sugars stored in plant organs,may serve as intermediate pools between assimilation and utilisation.However,the effect of resin tapping between tree growth and non-structural carbo-hydrates is not well understood.This study investigated(1)the effects of resin tapping on radial growth,(2)the effects of resin tapping on non-structural carbohydrate pools in different compartments,and(3)the feasibility of resin pro-duction without disruption of tree growth.Twenty one-year-old slash pines were subjected to resin tapping over two suc-cessive years.Non-structural carbohydrate concentrations in needles,branches,stem phloem,and roots of tapped and untapped trees in summer and winter were determined after the second year of resin harvest.The results showed that tapping had no significant effects on annual increments.Starch was the dominant non-structural carbohydrate frac-tion,regardless of tissues and season,and constituted up to 99%of the total non-structural carbohydrates in the phloem and roots.Glucose and fructose were the dominant sugars;sucrose was negligible.Compared with the controls,tapped trees showed 26%lower non-structural carbohydrate concen-tration in the phloem above the tapping wound in summer,which was attributable to the decreased abundance of starch,glucose,fructose,and sucrose.In winter,the altered non-structural carbohydrate profiles in the phloem above the tap-ping wounding were minimised as a result of recovery of the sugar concentrations.In contrast to free sugars,which accu-mulated substantially in needles and branches during winter,starch was enriched in the phloem,roots,and current-year needles.The results provide evidence for a localised effect of resin tapping,and highlight the observation that resin extrac-tion does not always cause a sacrifice in wood growth under a moderate resin-tapping intensity in slash pine plantations.

ZTE DSLAM Improves Operators' Carbon Footprint and Slashes Power Costs

ZTE Corporation (ZTE), a leading global provider of telecommunications equipment and network solutions, revealed on May 6, 2008 that its award winning Broadband Universal Access System could help operators make a major impact on their carbon footprint as well as save millions of dollars a year in power costs. ZTE’s DSLAM ZXDSL FSAP 9806H overreaches the European code of conduct on energy consumption for broadband equipment, offering a significant power consumption savings per port.

Effects of Slash-and-Burn Practices on Soil Quality at Different Landscape Positions in the Raumoco Watershed, Municipality of Lautem, Timor-Leste

Slash-and-burn practices used by farmers in prior growing periods could affect soil quality, particularly topsoil properties. This study aimed to assess soil biophysical and chemical properties at different landscape levels within the watershed site. Soil samples were collected by a core method in the topsoil layer in slash-and-burn sites. Field analysis was on bulk density and porosity by the gravimetric method, while laboratory analysis was done on organic matter by the Loss on Ignitions Method and other macronutrients for crops (total nitrogen, phosphorus availability, and potassium availability) followed standard analytical methods. To see if there was a significant difference between sites, DMRT 5% was used. The results of the study showed slash-and-burn practice affects soil physical properties such that high bulk density in upstream, midstream, and downstream ranged from 1.55 g/cm3 to 1.71 g/cm3, 1.55 g/cm3 to 1.80 g/cm3, and 1.38 g/cm3 to 1.79 g/cm3 respectively. Poor porosity in upstream, midstream, and downstream ranged from 33.91% to 40.06%, 30.38% to 41.75%, and 30.91% to 46.65%, respectively. Organic matter content was low in the upstream, midstream, and downstream areas, ranging from 2.86% to 3.39%, 2.58% to 3.88%, and 2.91% to 3.88%, respectively. However, soil pH remains neutral, and nitrogen levels are low but near-optimal in the upstream and very low in the midstream and downstream. Phosphorus is extremely high upstream but very low in midstream and downstream. However, potassium remains at a low level close optimum level in the entire watershed.

前枪花吉他手Slash要发片 白条纹主唱拒绝献唱

作为摇滚史上最好的吉他手之一，Slash在离开枪炮与玫瑰乐队13年后终于要发行第一张个人专辑，为了郑重其事，他请来摇滚圈内的多位大腕合作。其中Flea乐队、前涅磐乐队鼓手和喷火战机乐队的核心大卫·格鲁以及传奇歌手艾里斯·库珀已经同意加盟，

Soil C and N Pools in Chinese Fir and Evergreen Broadleaf Forests and their Changes with Slash Burning in Mid-Subtropical China

Soil organic carbon (C) and total nitrogen (N) pools of a Chinese fir (Cunninghamia lanceolate, (Lamb.) Hook.) (CF) forest, and an evergreen broadleaf (EB) forest located in mid-subtropical, southeastern China, were compared before clearcutting, with the effect of slash burning on organic C and total N in the top 10 cm of soil before and after burning also being evaluated. Prior to clearcutting CF forest had significantly lower (P < 0.05) organic C and total N in the soil (0-100 cm) compared to EB forest with approximately 60% of the C and N at the two forest sites stored at the 0 to 40 cm soil. In post-burn samples of the 0-10 cm depth at 5 days, 1 year, and 5 years for CF and EB forests, significantly lower levels (P < 0.05) of organic C and total N than those in the pre-burn samples were observed. Compared to the pre-burn levels, at post-burn year 5, surface soil organic C storage was only 85% in CF forest and 72% in EB forest, while total N storage was 77% for CF forest and 73% for EB forest. Slash burning caused marked long-term changes in surface soil C and N in the two forest types.

Growth Responses of Young Slash Pine (Pinus elliottii Engelm.) to N, P and K Fertilizers in Red-Yellow Soil in Jiangxi Province, China

During 1991-1995,the growth responses of young slash pine to N,P and K fertilizers and rational rate and ration of fertilizer in yellow-red soil at Fengshushan Forest Farm Jiangxi Province were studied.N fertilizer decreased the growth of slash pine,while P no only significanlty improved the increment of bottom diameter,height and crown diameter,but also caused earlier canopy closure of the stand.It also had a sustainable effect in the next two years.Slash pine had the most significant response to the treatment of 200 kg P2O5 ha^-1 ,in which tree height,bottom diameter and crown diameter(EW and SN) were increased by 22%,35%,20% and 18% i 1994,21%,25%,10% and 10% in 1995,respectively,compared to the control.Although there was no remarkable response to K fertilizer,good growth response to the application of 100 kg P2O5 plus 100 kg K2O ha^-1 existed and tree hieght ,bottom diameter and rown diameter(EW and SN ) were increased by 31%,14%,23% and 21%,respectively,in 1993 ,compared to the control.

抗性湿地松体细胞胚的发育、成熟及萌发

为加快抗松针褐斑病湿地松体细胞胚胎发生技术的产业化应用进程,本文研究了肌醇浓度、脱落酸(ABA)及其添加方式、基本培养基、聚乙二醇(PEG-6000)浓度、琼脂糖种类及浓度、活性炭浓度、液体悬浮培养等因素对抗性湿地松体细胞胚的发育、成熟及萌发的影响。结果表明:添加8 g/L肌醇较适宜,过高浓度的肌醇则不利于湿地松体细胞胚发育;ABA可以采用高压灭菌;基本培养基、ABA、PEG-6000互作对湿地松体细胞胚的成熟影响很大,基本培养基以LP为最佳,ABA的最适浓度为10m g/L,PEG-6000以添加25、50 g/L为宜;在湿地松体细胞胚的成熟培养过程中,PEG-6000的浓度不能高于100 g/L;在湿地松体细胞胚的成熟培养基中,添加60 g/L蔗糖最合适;湿地松体细胞胚的成熟培养基中添加0.5 g/L或1 g/L的活性炭较适宜;培养基状态对体细胞胚的高频率诱导具有一定的影响,悬浮培养以100 mL三角瓶装培养液30 mL、摇床转速130 r/min为宜,液体转固体时吸取培养液1 mL为宜;未建立成熟的体细胞胚发生体系前,以采用固体培养为佳。最佳成熟培养基、激素及部分添加物组合为LP+10 mg/L ABA+50 g/L PEG-6000+60 g/L蔗糖+1.0 g/L活性炭。

服装中的现代切口设计语言探析

为更好地了解和运用服装切口,以近几年流行趋势中运用切口设计的女装为研究对象,针对切口的设计语言,运用案例分析、文献研究、对比分析的研究方法,分别对点切口、线切口以及面切口的设计语言进行探析,并归纳影响切口语言表达的因素。研究表明:点切口总体设计语言含蓄别致,能形成服装的亮点或能增添服装的设计感与时尚感;线切口设计语言或简洁优雅或丰富生动或具有极强的节奏感、秩序感;面切口构成形式多样,总体设计语言性感野性、大胆张扬。服装切口设计语言已衍生出诸多表达形式,可为现代服饰切口设计提供理论依据和实际参考。

当代青年“斜杠创业”研究:学术史梳理与展望

随着“斜杠青年”在世界范围内的大量涌现,同时持有“受雇”和“自雇”工作的“斜杠创业者”作为斜杠青年的典型代表开始得到研究关注。作为一个受实践驱动的新兴研究领域,国内斜杠创业研究还不够成熟。通过梳理国内外斜杠创业相关文献,明确了斜杠创业的内涵、斜杠创业者的分类,分析了青年斜杠创业的前因、后续选择以及影响,在此基础上总结了现有研究的局限并根据研究发展趋势展望了未来研究方向。

他是一把真正的枪——记“枪炮玫瑰乐队”吉他手Slash

我敢说,只要是看过Slash的人,哪怕只要一眼,他就不会忘记。一顶标志性的绅士礼帽,爆炸的长发永远挡在脸庞前面,让你无法看到他的眼睛,黑手套。

Influence of climate fluctuations on Pinus palustris growth and drought resilience

The longleaf pine(Pinus palustris Mill.)ecosystem is an endangered ecosystem in the southeastern USA,and efforts to restore the species are ongoing.However,in recent decades,the region has experienced drastic fluctuations between wet and dry growing season conditions from year to year,and it is not fully understood how these fluctuations have influenced the growth of P.palustris.To address this topic,we cored P.palustris trees in woodlands of southwest Georgia and used dendrochronology techniques to determine how climate fluctuations have influenced the growth and drought resilience of P.palustris.We also cored slash pine(Pinus elliottii Engelm.)trees in the same woodlands to compare growth between species.While P.palustris growth was less impacted by adverse climate conditions compared to P.elliottii,the strength of correlations between P.palustris growth and temperature,precipitation,and Palmer Drought Severity Index(PDSI)changed over time.In recent decades,climate conditions during the growing season became more influential on P.palustris growth than the previous year's conditions.This is concerning given that drought severity during the growing season has been increasing.Our results also indicate that P.palustris was less resilient to droughts during the 2000s and 2010s than to those of the 1950s.Under this new climate paradigm,our results suggest that P.palustris might be more susceptible to growth reductions and less resistant to droughts than once expected.This work highlights the importance of understanding the impact of novel climate conditions on P.palustris and has implications for restoration efforts,such as using silvicultural treatments that reduce tree vulnerability to drought(e.g.,thinning)and promote other climate-adapted species in mixture with P.palustris.

香格里拉普朗尾矿区工程边坡植被恢复调查研究

为研究香格里拉市高寒山区工程边坡迹地植物群落结构,以香格里拉普朗尾矿区工程边坡迹地为研究对象,研究其植物群落的物种组成、物种相似性及物种多样性。结果表明:工程迹地乔木层的优势种主要是丽江云杉,灌木层优势种以川滇高山栎为主,其次是滇西北小檗和西南蔷薇,草本层优势种以苔草、蒿等植物为主,未受破坏的自然林地植物优势种更为多元化;工程迹地1年自然恢复样地与自然群落样地物种相似性指数较小,为0.03~0.30;工程迹地多年自然恢复样地物种与自然群落样地物种相似性系数较高,最高为0.43;F1样地草本层Simpson多样性指数、Shannon-Wiener多样性指数均较大,但不同工程迹地之间差别较小。草本层自然恢复较快,在演替早期,草本植物中的蒿、苔草、野青茅及西南鸢尾等植物,可作为工程迹地植被恢复的先锋植物。

抗性湿地松胚性愈伤组织的维持与增殖

将抗松针褐斑病湿地松愈伤组织转接至不同培养基及多种添加物中,开展了不同愈伤组织类型、不同浓度肌醇与麦芽糖、不同2,4-二氯苯氧乙酸(2,4-D)、6-苄基氨基嘌呤(6-BA)、激动素(KT)浓度组合、添加维生素(VC)、添加硝酸银(AgNO3)、不同基因型胚性愈伤组织、多次继代后胚性愈伤组织与培养基的适应性等研究。结果表明:湿地松不同愈伤组织类型在增殖过程中成活率及增殖状况都存在很大差异;当麦芽糖浓度为15 g/L,肌醇浓度为1000 mg/L时最有利于胚性胚柄细胞团(ESM)的增殖;高浓度的2,4-D、6-BA不利于湿地松胚性愈伤组织的增殖,最佳增殖培养基及激素组合DCR+1.0 mg/LNAA+0.32 mg/L6-BA+0.31 mg/LKT、DCR+1.0 mg/LNAA(萘乙酸)+1.55 mg/L6-BA+0.064 mg/LKT;添加维生素(VC)浓度为10 mg/L时,对湿地松愈伤的褐化有明显抑制作用,但浓度过高则会增加愈伤的褐化率;添加3.4 mg/L的AgNO3促进了湿地松胚性愈伤组织的增殖;湿地松不同家系不同基因型间增殖能力差异显著,20#2和10#1增殖很快明显优于10#4、10#5和20#3;湿地松胚性胚柄细胞团在同样的培养基上多次继代后,愈伤组织增殖变慢,中心褐化较多,有些还会出现水渍状,可能导致其胚性丧失。湿地松不同愈伤组织类型在增殖过程中,成活率及增殖状况都存在很大的差异。Ⅲ型、Ⅳ型愈伤可能同时含有胚性愈伤和非胚性愈伤,在培养基条件适合的情况下胚性愈伤转化成胚性胚柄细胞团,但是转化频率极低。而Ⅴ型、Ⅵ型愈伤在后期培养过程中基本褐化死亡。

地方性知识的转型研究:清水江流域从刀耕火种到林粮间作

明末清初,清水江流域由于木材贸易的开启,引发了该区域生计方式从刀耕火种到林粮间作的转型,在林粮间作知识体系中巧妙地继承与发扬刀耕火种的技术体系。地方性知识的转型与特定的自然背景与社会背景相关,随着社会生境的变化,地方性知识将具有新的生命活力。以清水江流域林粮间作为个案进行研究,认为所有的地方性知识都是应对特定的自然环境与社会环境而构建起的文化生态共同体,并随着社会生境的变迁而存在转型的可能性。地方性知识的转型是知识体系与社会生境的耦合,并具有一定的社会价值。

基于单片机的电子鞭炮设计

传统习俗里,逢年过节等日子总少不了燃放鞭炮来烘托吉祥、喜庆的氛围,但燃放鞭炮严重污染环境,极易引发火灾事故,造成伤亡和财产损失。“禁炮令”消除了燃放鞭炮带来的副作用,但让我们的节日缺少了喜庆的感觉。介绍一种电子鞭炮的设计,当光感触发电路受到光照时,单片机启动点火电路模拟普通鞭炮引线燃烧过程,然后声效电路发出鞭炮燃放的声音,同时闪光电路伴随着声效电路的声音节奏进行闪光。本设计电路简单、成本低、操作简单、易二次开发,同样能烘托喜庆的氛围,与传统的普通鞭炮相比无污染、安全性高、可重复利用,应用前景广阔。

不同立地管理措施对2代杉木人工林3年生林分生长影响的研究

为研究不同立地管理方式对多代经营杉木人工林生产力的影响 ,在 1代杉木采伐迹地上用5种林地处理方式进行 2代杉木人工林营造 ,试验表明 :( 1) BL3 BM0 (收获树干和树皮、加倍填加采伐剩余物 )处理方式对 3年生 2代杉木林的生长最为有利 ,其次为 BL0 BM0 (收获地上所有有机质 )处理 ;( 2 ) BL1BM0 (清走树木的所有地上部分 )处理生长最慢 ;( 3 ) BL2 BM1(商业性收获加炼山 )处理的杉木生长比 BL2 BM0 (商业性收获 )的略好 ,但未达到差异显著水平 ;( 4 )除了 BL3 BM0 处理与BL1BM0 处理间的杉木单株总生物量差异达显著水平外 。