Preliminary Study on Water Demand Law of 1-0 Rooted Cuttings of Populus szechuanica

In order to provide theoretical basis and technical support for the afforestation and artificial water supply of P.szechuanica in arid areas,the characteristics of water consumption of P.szechuanica were explored,and the law of water demand of P.szechuanica was grasped.In this paper,potted seedlings of 1-0 rooted cuttings of P.szechuanica were taken as research objects,and change situation of water consumption under different water control gradients was measured regularly by using weighing method,further analyzing dynamic change of water consumption of P.szechuanica and revealing water demand law of 1-0 rooted cuttings of P.szechuanica.The results showed that total change of water consumption of 1-0 rooted cuttings of P.szechuanica had"slow-fast-slow-fast"double-peak trend in the growth period of the current year,and corresponded with univariate linear relation(R^(2)=0.7137),with significant difference.In whole growth period,water consumption in August was the highest,which was 2.7 times of that in June and July and 1.5 times of that after September.In different water control treatments,the dynamic changes of daily and monthly water consumption were significantly different.In seven water control treatments,monthly water consumption was between(6315.95±1690.70)and(10105.28±3065.30)g/month,and mean was(8211.07±2308.23)g/month.With intensification of water control treatment,water consumption increased,but there was no seedling death due to water shortage.P.szechuanica has great plasticity in water demand,and can survive in both arid and humid environments.Meanwhile,it is revealed that P.szechuanica is the most widely distributed tree species in the region.

导光板中一种V-Cut槽结构的设计方法

提出了一种V-Cut槽结构的液晶导光板表面微结构设计方法,确定了V-Cut槽自身参数影响导光板性能的规律,通过大量的实验工作对不同的微结构设计方式进行了对比,确定了V-Cut槽的最佳排布方式即多项式排布方式。总结了多项式中各个参数所代表的含义,确定了V-Cut槽结构按照多项式方式进行设计的规律。经检验,此方法能够设计出光能利用率高、均匀性在80%以上的高性能导光板。

LIGHT、IFN-γ基因转染人肝癌HepG2细胞凋亡及其Caspase-3和survivin表达

目的观察LIGHT、IFN-γ基因转染人肝癌细胞HepG2的凋亡及其Caspase-3和survivin的表达变化。方法用LIGHT、IFN-γ真核细胞表达质粒pcDNA4C-LIGHT-cDNA、pcDNA4C-IFN-γ-cDNA及其转化的E.coliJM-109感受态大肠杆菌,经质粒提取后,转染人肝癌细胞HepG2,同时设对照组(未转染)。分别于转染后12、24、48 h收集HepG2细胞。流式细胞仪检测细胞凋亡和Caspase-3、survivin。结果转染后细胞凋亡及Caspase-3表达量在对照组、LIGHT单转组、联合转染组呈逐渐递增趋势,survivin表达量呈递减趋势。结论LIGHT转染后能通过调节HepG2细胞Caspase-3及survivin的表达来发挥促细胞凋亡作用,INF-γ能增强LIGHT诱导的HepG2细胞凋亡,且显著上调其Caspase-3的表达。

Layer regrouping for water-flooded commingled reservoirs at a high water-cut stage

Layer regrouping is to divide all the layers into several sets of production series according to the physical properties and recovery percent of layers at high water-cut stage, which is an important technique to improve oil recovery for high water-cut multilayered reservoirs. Dif- ferent regroup scenarios may lead to different production performances. Based on unstable oil-water flow theory, a multilayer commingled reservoir simulator is established by modifying the production split method. Taking into account the differences of layer properties, including per- meability, oil viscosity, and remaining oil saturation, the pseudo flow resistance contrast is proposed to serve as a characteristic index of layer regrouping for high water-cut multilayered reservoirs. The production indices of multi- layered reservoirs with different pseudo flow resistances are predicted with the established model in which the data are taken from the Shengtuo Oilfield. Simulation results show that the pseudo flow resistance contrast should be less than 4 when the layer regrouping is implemented. The K-means clustering method, which is based on the objec- tive function, is used to automatically carry out the layer regrouping process according to pseudo flow resistances. The research result is applied to the IV-VI sand groups of the second member of the Shahejie Formation in the Shengtuo Oilfield, a favorable development performance is obtained, and the oil recovery is enhanced by 6.08 %.

Quantifying urbanization levels on the Tibetan Plateau with high-resolution nighttime light data

The Tibetan Plateau(TP)is undergoing rapid urbanization.To improve urban sustainability and construct eco-logical security barriers,it is essential to quantify the spatial patterns of urbanization level on the TP,but the existing studies on the topic have been limited by the lack of socioeconomic data.This study aims to quantify the urbanization level on the TP in 2018 with Luojia1-01(LJ1-01)high-resolution nighttime light(NTL)data.Specifically,the compounded night light index is used to quantify spatial patterns of urbanization level at mul-tiple scales.The results showed that the TP had a low overall urbanization level with a large internal difference.The urbanization level in the northeast,southeast and south of the TP was relatively high,forming three hotspots centered in Xining City,Lhasa City and Shangri-La City,while the urbanization level in the central and western regions was relatively low.The analysis of influencing factors,based on the random forest model,showed that transportation and topography were the main factors affecting the TP’s spatial patterns of urbanization level.The comparison analysis with socioeconomic statistics and traditional NTL data showed that LJ1-01 NTL data can be used to more effectively quantify the urbanization level since it is more advantageous for reflecting the spatial extent of urban land and describing the spatial structure of socioeconomic activities within urban areas.These advantages are attributed to the high spatial resolution of the data,appropriate imaging time and unaf-fected by saturation phenomena.Thus,the proposed LJ1-01 NTL-based urbanization level measurement method has the potential for wide applications around the world,especially in less-developed regions lacking statistical data.Using this method,we refined the measurement of the TP’s urbanization level in 2018 for multiple scales including the region,basin,prefecture and county levels,which provides basic information for the further urban sustainability research on the TP.

Highly enhanced visible-light photocatalytic hydrogen evolution on g-C_3N_4 decorated with vopc through π-π interaction

Photocatalytic H2 evolution reactions on pristine graphitic carbon nitrides(g-C3N4),as a promising approach for converting solar energy to fuel,are attractive for tackling global energy concerns but still suffer from low efficiencies.In this article,we report a tractable approach to modifying g-C3N4 with vanadyl phthalocyanine(VOPc/CN)for efficient visible-light-driven hydrogen production.A non-covalent VOPc/CN hybrid photocatalyst formed viaπ-πstacking interactions between the two components,as confirmed by analysis of UV-vis absorption spectra.The VOPc/CN hybrid photocatalyst shows excellent visible-light-driven photocatalytic performance and good stability.Under optimal conditions,the corresponding H2 evolution rate is nearly 6 times higher than that of pure g-C3N4.The role of VOPc in promoting hydrogen evolution activity was to extend the visible light absorption range and prevent the recombination of photoexcited electron-hole pairs effectively.It is expected that this facile modification method could be a new inspiration for the rational design and exploration of g-C3N4-based hybrid systems with strong light absorption and high-efficiency carrier separation.

Comparison of Low Stress Mechanical Properties of Light Weight Wool and Wool Blend Fabrics using the KES-F and FAST Instruments

This study compares the test results of the FAST (Fabric Assurance by Simple Testing) with those of the KES - F (Kawabata Evaluation Systems for Fabrics) for a range of nineteen light weight wool and wool blend fabrics in terms of the low - stress mechanical properties of bending, shear, and tensile deformation. It is found that there are very significant correlations between the corresponding parameters for extensibility and shear rigidity obtained from the test results of the two systems. The correlation between the values of bending rigidity obtained from the two systems is only moderate. Furthermore, for the fabrics tested in this study, the values of bending rigidity, shear rigidity, and extensibility measured using the KES - F instruments are higher than those of the corresponding parameters measured using the FAST instruments. The linear regression equation is given for each pair of corresponding parameter.

Permeation Characteristics of Light Hydrocarbons Through Poly（amide-6-β-ethylene oxide） Multilayer Composite Membranes

In this paper, poly(amide-6-β-ethylene oxide) (PEBA1657) copolymer was used to prepare multilayer polyetherimide (PEI)/polydimethylsiloxane (PDMS)/PEBA1657/PDMS composite membranes by dip-coating method. Permeation behaviors of ethylene, ethane, propylene, propane, n-butane, methane and nitrogen through the multilayer composite membranes were investigated over a range of operating temperature and pressure. The permeances of light hydrocarbons through PEI/PDMS/PEBA1657/PDMS composite membranes increase with their increasing condensability, and the olefins are more permeable than their corresponding paraffins. For light hydrocarbons, the gas permeances increase significantly as temperature increasing. When the transmembrane pressure difference increases, the gas permeance increases moderately due to plasticization effect, while their apparent activation energies for permeation decrease.

Population Spatial Distribution Based on Luojia 1-01 Nighttime Light Image:A Case Study of Beijing

With the continuous development of urbanization in China,the country’s growing population brings great challenges to urban development.By mastering the refined population spatial distribution in administrative units,the quantity and agglomeration of population distribution can be estimated and visualized.It will provide a basis for a more rational urban planning.This paper takes Beijing as the research area and uses a new Luojia1-01 nighttime light image with high resolution,land use type data,Points of Interest(POI)data,and other data to construct the population spatial index system,establishing the index weight based on the principal component analysis.The comprehensive weight value of population distribution in the study area was then used to calculate the street population distribution of Beijing in 2018.Then the population spatial distribution was visualize using GIS technology.After accuracy assessments by comparing the result with the WorldPop data,the accuracy has reached 0.74.The proposed method was validated as a qualified method to generate population spatial maps.By contrast of local areas,Luojia 1-01 data is more suitable for population distribution estimation than the NPP/VIIRS(Net Primary Productivity/Visible infrared Imaging Radiometer)nighttime light data.More geospatial big data and mathematical models can be combined to create more accurate population maps in the future.

Application of color structured light pattern to measurement of large out-of-plane deformation

Measurement of out-of-plane deformation is significant to understanding of the deflection mechanisms of the plate and tube structures.In this study,a new surface contouring technique with color structured light is applied to measure the out-of-plane deformation of structures with one-shot projection.Through color fringe recognizing,decoding and triangulation processing for the captured images corresponding to each deformation state,the feasibility of the method is testified by the measurement of elastic deflections of a flexible square plate,showing good agreement with those from the calibrated displacement driver.The plastic deformation of two alloy aluminum rectangular tubes is measured to show the technique application to surface topographic evaluation of the buckling structures with large displacements.

基于Normalized Cut的图像分割改进算法

用Normalized Cu(tN-Cut)准则分割图片时,会出现诸如过分割或者欠分割的不理想情况。在N-Cut结果的基础上提出了一种改进算法:利用合并-分裂方法,将颜色和纹理相似的区域合并,并对某些区域做进一步N-Cut分割。实验证明,改进后的算法不仅保留了N-Cut方法的优点,而且从一定程度上解决了过分割和欠分割的缺点,能够处理一些自然界的彩色图片,得到了比较理想的分割结果。

LIGHT在低氧性肺动脉高压形成中的作用及机制

目的初步探讨LIGHT在低氧性肺动脉高压(hypoxic pulmonary hypertension,HPH)形成中的作用及其机制。方法将20只8周龄雌性C57BL/6J小鼠[体质量(17.90±0.91)g]和20只8周龄雌性LIGHT-/-C57BL/6J小鼠[体质量(17.55±0.93)g]分为4组(n=10):(1)野生小鼠常氧组(WT-C组)、(2)野生小鼠低氧组(WT-H组)、(3)LIGHT KO小鼠常氧组(LIGHT KO-C组)、(4)LIGHT KO小鼠低氧组(LIGHT KO-H组)。WT-H组和LIGHT KO-H组小鼠置于模拟6 000 m低压舱内连续低氧饲养30 d,WT-C组和LIGHT KO-C组小鼠舱外(海拔308 m)常规饲养。检测右心室收缩压(right ventricular systolic pressure,RVSP)和右心肥厚指数(right ventricular hypertrophy index,RVHI);HE染色观察肺小动脉结构;免疫组化检测LIGHT及其受体HVEM、LTβR表达;荧光定量PCR和Western blot检测肺组织LIGHT、HVEM和LTβR、IL-6的mRNA和蛋白水平。流式细胞术检测肺组织中各类炎症细胞的比例。结果与WT-C组相比,WT-H组肺组织中LIGHT的mRNA和蛋白水平均显著增高(P<0.05),WT-H组RVSP和RVHI明显升高(P<0.05),肺小动脉明显增厚;与LIGHT KO-C组相比,LIGHT KO-H组小鼠的RVSP、RVHI和肺小动脉厚度显著增加(P<0.05),但与WT-H组相比,LIGHT KO-H组的RVSP、RVHI和肺小动脉增厚程度明显降低(P<0.05)。与WT-C组相比,WT-H组LIGHT受体HVEM表达增加,LTβR表达降低,差异具有统计学意义(P<0.05)。LIGHT KO-H组与WT-H组相比,肺组织IL-6 mRNA和蛋白水平显著降低(P<0.05)。流式细胞检测发现,与WT-C组相比,WT-H组小鼠肺组织中单核细胞比例降低[(3.88±0.87)%vs(11.03±1.71)%,P<0.05],间质巨噬细胞比例升高[(15.56±2.69)%vs(8.57±2.17)%,P<0.05];与WT-H组相比,LIGHT KO-H组的肺组织单核细胞增加[(6.55±1.01)%vs(3.88±0.87)%,P<0.05],而间质巨噬细胞的比例降低[(10.87±1.68)%vs.(15.56±2.69)%,P<0.05]。结论慢性低氧诱导肺组织中LIGHT表达增加与HPH发病机制密切相关。LIGHT可能通过HVEM信号途径促进细胞增殖、上调肺组织IL-6表达、促进肺间质巨噬细胞产生,参与HPH的形成。

先天性冠状动脉-肺动脉瘘64层CT诊断1例报告

1临床资料患者,男性,70岁,因反复心悸、头昏、黑蒙5 a,彩超显示心影增大。2 CT心脏冠状动脉成像采用64层Light Speed VCT（GE公司）,增强扫描采用双筒高压注射器（STELLANT,MEDRAD公司）、非离子型造影剂碘帕醇（碘的质量浓度为370 g/L,GE公司）。控制患者心率至65-75次／min。心率较快者可于检查前1h含服25～100mg美托洛尔。患者平卧，连接心电门控，

Ⅱ-Ⅵ族量子点掺杂玻璃的光学性质及研究进展

由于量子限域效应,尺寸可调的Ⅱ-Ⅵ族量子点掺杂玻璃在光学滤波片、非线性光学器件上的应用已经被广泛研究。玻璃中量子点的光学性质主要由量子点的尺寸、表面状态和周围基质环境决定,通过提高Se/Cd比可以有效地对量子点的表面缺陷进行钝化,实现CdSe量子点的本征发光;进一步调整热处理制度可以促进Zn离子扩散进入CdSe量子点表面,形成CdSe/Cd_(1-x)Zn_xSe核壳结构,使得缺陷发光几乎完全猝灭,从而提高量子点的荧光量子效率;在玻璃中原位合成的CdS/ZnS核壳结构量子点的荧光量子效率可达到53%。随着基础研究中玻璃中Ⅱ-Ⅵ族量子点荧光效率的不断提高,发光二极管(LED)等小型发光器件的制造成为可能。为了满足实际需要,建立核壳结构中量子点表面钝化机理模型,进一步优化量子点荧光效率是下一步需要解决的问题。

UV-C辐照处理对冷藏鲜切黄甜竹笋品质的影响

研究紫外光C波段(ultraviolet light C,UV-C)辐照处理对采后剥壳后的鲜切黄甜竹笋的品质、木质化和褐变的控制效果。黄甜竹笋剥壳后经过UV-C 2.6 k J/m^2强度辐照后,于(6±1)℃、85%~90%相对湿度环境下贮藏10 d。结果显示:UV-C处理显著(p<0.05)抑制了黄甜竹笋切面的褐变,显著(p<0.05)延缓了黄甜竹笋的硬度、腐烂率、纤维素、木质素和H_2O_2含量的上升,同时也显著(p<0.05)抑制了过氧化物酶(peroxidase, POD)、肉桂醇脱氢酶(cinnamyl alcohol dehydrogenase,CAD)、苯丙氨酸解氨酶(phenylalanine ammonia lyase,PAL)、多酚氧化酶(polyphenol oxidase,PPO)的活性,显著(p<0.05)提高了超氧化物歧化酶(superoxide dismutase,SOD)和过氧化氢酶(catalase,CAT)的活性。结果表明,UV-C辐照处理能够通过降低木质素合成代谢相关酶活、提高SOD和CAT的活性进而抑制采后去壳竹笋木质素的累积,从而延缓采后冷藏竹笋的木质化进程,保持良好的可食用品质。

The effect of slight to minor biodegradation on C_6 to C_7 light hydrocarbons in crude oils: a case study from Dawanqi Oilfield in the Tarim Basin,NW China

Light hydrocarbons （LHs） are one of the main petroleum fractions in crude oils, and carry much infor- mation regarding the genetic origin and alteration of crude oils. But secondary alterations--especially biodegrada- tion--have a significant effect on the composition of LHs in crude oils. Because most of the LHs affected in oils underwent only slight biodegradation （rank 1 on the biodegradation scale）, the variation of LHs can be used to describe more the refined features of biodegradation. Here, 23 crude oils from the Dawanqi Oilfield in the Tarim Basin, NW China, eleven of which have been biodegraded to different extents, were analyzed in order to investigate the effect of slight to minor biodegradation on C6--C7 LHs. The study results showed that biodegradation resulted in the prior depletion of straight-chained alkanes, followed by branched alkanes. In slight and minor biodegraded oils, such biodegradation scale could not sufficiently affect C6- C7 cycloalkanes. For branched C6--C7 alkanes, generally, monomethylalkanes are biodegraded earlier than dimethylalkanes and trimethylalkanes, which indicates that branched alkanes are more resistant to biodegradation, with the increase of substituted methyl groups on parent rings. The degree of alkylation is one of the primary controlling factors on the biodegradation of C6-Cv LHs. There is a particular case： although 2,2,3-trimethylbutane has a rela- tive higher alkylation degree, 2,2-dimethylpentane is more resistant to biodegradation than 2,2,3-trimethylbutane. 2,2- Dimethylpentane is the most resistant to biodegradation in branched C6-C7 alkanes. Furthermore, the 2-methylpen- tane/3-methylpentane and 2-methylhexane/3-methylhexane ratios decreased steadily with increasing biodegradation, which implies that isomers of bilateral methyl groups are more prone to bacterial attack relative to mid-chain iso- mers. The position of the alkyls on the carbon skeleton is also one of the critical factors controlling the rate of biodegradation. With increasing biodegradation, Mango＇s LH parameters K1 values decrease and K2 values increase, the values of n-heptane and isoheptane decrease, and the indices of methylcyclohexane and cyclohexane increase. LH parameters should be applied cautiously for the biodegraded oils. Because biodegraded samples belong to slight or minor biodegraded oils, the values of n-heptane and isoheptane from Dawanqi Oilfield can better reflect and determine the ＂Biodegraded＂ zone. When the heptane value is 0-21 and the isoheptane value is 0-2.6, the crude oil in Dawanqi Oilfield is defined as the ＂Biodegraded＂ zone

Tracking leaf area index and coefficient of light extinction over the harvesting cycle of black wattle

The amount of photosynthetic radiation inter- cepted by a crop is a function of the incident solar radiation on the plants, the leaf area index （LAI）, and the light extinction coefficient （k）. We quantified LAI and k in stands of black wattle （Acacia mearnsii De Wild.） over a 7-year growth cycle at two locations in the state of Rio Grande do Sul, Brazil. Our study was conducted in commercial stands in agroecological regions with high densities of black wattle plantations. LAI was calculated as the ratio between the leaf area of a tree and its planting space, and k was derived from Beer＇s law. LAI depends on the planting site and stand age. Between the two sites, the LAI was similar over time, the amount of variation differed. Values of k depended only on stand age, with the highest average observed for stands up to 5 years old. The trend of k during the plantation cycle was inversely proportional to LAI and was correlated with LAI, leaf area, leaf dry mass, canopy volume, height, branches dry mass, total dry mass, and crown diameter.

Tuning the particle size,physical properties,and photocatalytic activity of Ag_(3)PO_(4)materials by changing the Ag^(+)/PO_(4)^(3-)ratio

This study demonstrates the influence of the Ag^(+)/PO_(4)^(3-)ratio in precursor solution on the crystal structural formation,morphology,physical properties,and photocatalytic performance of a Ag_(3)PO_(4)photocatalyst that is fabricated,using a facile precipitation method,from AgNO_(3)and Na2HPO_(4)·12H_(2)O.The material characterizations were carried out using x-ray diffraction(XRD),scanning electron microscopy(SEM),energy-dispersive x-ray spectroscopy(EDX),Brunauer–Emmett–Teller(BET)surface area,Fourier transform infrared(FTIR)absorption,Raman scattering,x-ray photoelectron spectroscopy(XPS),UV-vis absorption,and photoluminescence(PL).The results show that Ag_(3)PO_(4)crystallizes better when the excess PO_(4)^(3-)content increases,and the lattice parameters decrease slightly,while the crystal diameter and the particle size increase.This change is also observed in the Raman scattering and FTIR spectra with the increase in the vibration frequency of the[PO_(4)]group.The compression of the[PO_(4)]unit was also confirmed in the XPS spectra with the shift of P 2p peaks toward higher binding energy.The photocatalytic results showed that the samples synthesized from excess PO_(4)^(3-)solution exhibited higher photocatalytic performance compared to the sample with a Ag^(+)/PO_(4)^(3-)ratio of 3:1.A sample prepared from the precursor solution with a Ag^(+)/PO_(4)^(3-)ratio of 3:1.5 was optimal for RhB decomposition under both visible light and natural sunlight,completely decomposing 10 ppm RhB after 15 minutes of xenon lamp irradiation and after 60 minutes under solar light irradiation.This is attributed to the high crystallinity,small particle size and low electron–hole recombination rate of the sample.

轻稀土对WC-10Co硬质合金表面PVD涂层微观结构与性能的影响

用轻稀土含量为0.1﹪的WC-0.1RE-10Co硬质合金混合料,在1 380℃温度下真空烧结,制备CNMG-120408型号车刀.将刀具经喷砂和超声清洗后,采用磁控溅射工艺在表面沉积TiAlN涂层.对涂层刀具进行微观结构观察和切削性能实验.结果表明:轻稀土的添加有助于增加涂层与基体的结合力,延长使用寿命并降低制备成本.

CUT201超声仪在工程应用的实例分析

我院自2000年购进了CUT201型超声仪以后,除了在教学中得以应用,还积极参加了工程实践活动。