Nuclear Effect on Gluon Distribution Function and Associate Production of J/Ψ and y with Large P_T in High Energy p-Fe Collision

With three theoretical models of nuclear effects on gluon distribution functions,the differentialcross sections and the total cross sections for associate production of J/ψ and γ with large P_T in high energyp-Fe collisions are calculated.

Parton distribution functions and nuclear EMC effect in a statistical model

A new and simple statistical approach is performed to calculate the parton distribution functions （PDFs） of the nucleon in terms of light-front kinematic variables.Analytic expressions of x-dependent PDFs are obtained in the whole x region.And thereafter,we treat the temperature T as a parameter of the atomic number A to explain the nuclear EMC effect in the region x ∈ [0.2,0.7].We give the predictions of PDF ratios,and they are very different from those by other models,thus experiments aiming at measuring PDF ratios are suggested to provide a discrimination of different models.

新型茂金属聚烯烃弹性体Vistamaxx的溶液13C NMR研究

Vistamaxx特种弹性体是一种新型的茂金属催化丙烯-乙烯共聚物,通过对其在溶液中13C NMR谱的归属和计算得到3种不同牌号的Vistamaxx弹性体的共聚物组成、单体和序列分布、亚甲基数均序列链长及分布等信息,并分别采用Bernoullian和一级Markovian统计模型对共聚物的三单元组序列分布进行处理,依据组成分布函数条件概率公式得到乙烯单元和丙烯单元的组成分布曲线.

Sterilization Effect of Cooking Process for Guilin Rice Noodles Based on Heat Conduction Model

Guilin rice noodles, a unique cuisine from Guilin, Guangxi, is renowned both domestically and internationally as one of the top ten “Guilin Classics”. Utilizing a heat conduction model, this study explores the effectiveness of the cooking process in sterilizing Guilin rice noodles before consumption. The model assumes that a large pot is filled with boiling water which is maintained at a constant high temperature heat resource through continuous gentle heating. And the room temperature is set as the initial temperature for the preheating process and the final temperature for the cooling process. The objective is to assess whether the cooking process achieves satisfactory sterilization results. The temperature distribution function of rice noodle with time is analytically obtained using the separation of variables method in the three-dimensional cylindrical coordinate system. Meanwhile, the thermal diffusion coefficient of Guilin rice noodles is obtained in terms of Riedel’ theory. By analyzing the elimination characteristics of Pseudomonas cocovenenans subsp. farinofermentans, this study obtains the optimal time required for effective sterilization at the core of Guilin rice noodles. The results show that the potential Pseudomonas cocovenenans subsp. farinofermentans will be completely eliminated through continuously preheating more than 31 seconds during the cooking process before consumption. This study provides a valuable reference of food safety standards in the cooking process of Guilin rice noodles, particularly in ensuring the complete inactivation of potentially harmful strains such as Pseudomonas cocovenenans subsp. farinofermentans.

Utilizing a new soil effective temperature scheme and archived satellite microwave brightness temperature data to estimate surface soil moisture in the Nagqu region, Tibetan Plateau of China

Since the early 2000s, many satellite passive microwave brightness temperature （BT） archives, such as the Advanced Microwave Scanning Radiometer for the Earth Observing System （AMSR-E） BTs, have become the useful resources for assessing the changes in the surface and deep soil moistures over both arid and semi-arid regions. In this study, we used a new soil effective temperature （T scheme and the archived AMSR-E BTs to estimate surface soil moisture （SM） over the Nagqu region in the central Tibetan Plateau, China. The surface and deep soil temperatures required for the calculation of regional-scale T were obtained from outputs of the Community Land Model version 4.5 （CLM4.5）. In situ SM measurements at the CEOP-CAMP/Tibet （Coordinated Enhanced Observing Period Asia-Australia Monsoon Project on the Tibetan Plateau） experimental sites were used to validate the AMSR-E-based SM estimations at regional and single-site scales. Furthermore, the spatial distribution of monthly mean surface SM over the Nagqu region was obtained from 16 daytime AMSR-E BT observations in July 2004 over the Nagqu region. Results revealed that the AMSR-E-based surface SM estimations agreed well with the in situ-based surface SM measurements, with the root mean square error （RMSE） ranging from 0.042 to 0.066 m3/m3 and the coefficient of determination （R2） ranging from 0.71 to 0.92 during the nighttime and daytime. The regional surface soil water state map showed a clear spatial pattern related to the terrain. It indicated that the lower surface SM values occurred in the mountainous areas of the northern, mid-western and southeastern parts of Nagqu region, while the higher surface SM values appeared in the low elevation areas such as the Tongtian River Basin, Namco Lake and bog meadows in the central part of Nagqu region. Our analysis also showed that the new T^scheme does not require special fitting parameters or additional assumptions, which simplifies the data requirements for regional-scale applications. This scheme combined with the archived satellite passive microwave BT observations can be used to estimate the historical surface SM for hydrological process studies over the Tibetan Plateau regions.

Analysis of inhibition of concrete steel-rebar corrosion by Na_2Cr_2O_7 concentrations:Implications for conflicting reports on inhibitor effectiveness

Corrosion test data were measured using non-destructive electrochemical techniques and analysed for studying inhibition effectiveness by different concentrations of NazCr207 on the corrosion of concrete steel-rehar in NaC1 and in H2SO4 media. For these, specifications of ASTM G16-95 R04 were combined with the normal and the Gumbel probability density functions as model analytical methods for addressing issues of conflicting reports of inhibitor effectiveness that had generated concerns. Results show that reinforced concrete samples admixed with concentrations having 4 g （0.012 7 tool）, 8 g （0.025 4 mol） and 6 g （0.019 l tool） NaaCr207 exhibited, in that order, high inhibition effectiveness, with respective efficiency, r/, of （90.46±1.30）%, （88.41＋2.24）% and （84.87±4.74）%, in the NaC1 medium. These exhibit good agreements within replicates and statistical methods for the samples. Also, optimal inhibition effectiveness model in the H2SO4 medium was exhibited by 8 g （0.025 4 mol） Na2Cr207 concentration having r/=（78.44±1.10）%. These bear implications for addressing conflicting test data in the study of effective inhibitors for mitigating steel-rebar corrosion in aggressive environments.

望虞河西岸水生态系统协同效应评价

水生态系统统筹治理是新时期水生态环境保护领域的重点与难点,水生态系统作用机制复杂,各子系统间存在紧密的影响与反馈关系,厘清水生态环境各子系统间协同作用机制十分重要。为此,以望虞河西岸水生态环境功能分区(简称分区)为评价单元,以水环境、沉积物、水生态3个子系统为研究对象,利用2019年丰、枯水期的实测数据,通过建立协同效应模型量化评价单元中研究对象间的协同效应,探究其时空差异性,识别其主要限制因素。结果表明:①丰水期环境条件更利于浮游动物的生长繁殖和水中污染物稀释,协同效应较枯水期更为强烈。②中协同和强协同的区域分布在太湖滨湖和望虞河沿岸处,说明分区水生态环境治理、修复工程举措初见成效,3个子系统耦合较好;弱协同或不协同的分区聚集在锡澄运河以东、长江以南的“三角区”。依据研究结果实施分区分类精细化管控,有利于提升望虞河西岸地区污染防治和生态修复措施的实施效率。

具有恐惧效应和Holling Ⅲ功能性反应的随机捕食-食饵系统

该文研究了一类具有恐惧效应和Holling Ⅲ功能反应的随机捕食-食饵系统.首先,证明了在任意给定正初始值下,系统全局正解的存在唯一性与均值有界性及随机最终有界性;其次,研究了食饵种群和捕食者种群灭绝和平均持续生存的充分条件,并构造Lyapunov函数证明了系统存在平稳分布及遍历性;最后,通过数值模拟验证了文章的结果.

不同含氧官能团对煤润湿性影响的分子动力学模拟研究

为了探究不同含氧官能团对煤润湿性的影响规律,基于分子动力学(molecular dynamics,MD)理论,构建4个不同含氧官能团模拟系统(—COOH、—OH、—CO及—OCH 3),通过模拟接触角、分子相对体积分数、径向分布函数及相互作用能结果,详细分析含氧官能团对煤润湿性的影响规律。研究结果表明:模拟平衡后,在—COOH体系中水团簇的接触角为18.65°,相互作用能为-1049.19 kcal/mol,并形成371.64个氢键。在—OH体系中水团簇的接触角为25.37°,相互作用能为-563.83 kcal/mol,并形成178.03个氢键。在—CO体系中水团簇的接触角为30.10°,相互作用能为-444.25 kcal/mol,并形成58.34个氢键。在—OCH 3体系中水团簇的接触角为59.96°,相互作用能为-149.00 kcal/mol,并形成13.25个氢键。水团簇与不同含氧官能团体系的接触角越小,形成的氢键越多,相互作用能绝对值越大,对煤亲水性增强作用越好,这与分子相对体积分数和径向分布函数分析结果一致;不同含氧官能团对煤亲水性增强作用排序为—COOH>—OH>—CO>—OCH 3。研究结果可为研究煤表面润湿性及其应用提供相关参考。

Quark distributions in nuclei and nuclear effects on nucleon structure functions

Extended quark distribution functions are presented obtained by fitting a large amount of experimental data of the l-A DIS process on the basis of an improved nuclear density model. The experimental data of l-A DIS processes with A≥ 3 in the region 0.0010 ≤ x ≤ 0.9500 are quite satisfactorily described by using the extended formulae. Our knowledge of the influence of nuclear matter on the quark distributions is deepened.

关于LHC能区pp碰撞系统中顶夸克横动量分布的研究

顶夸克是标准模型中最重的粒子,它的发现进一步验证了标准模型的正确性,并为人们探索标准模型之外的新物理提供了新的手段.在实验上,高能碰撞是研究顶夸克的唯一途径.在多源热模型框架下对Tsallis分布与逆幂律分布函数进行改进,运用改进后的双组分统计分布对产生顶夸克的碰撞反应系统中末态粒子的横动量分布进行描述,提取出相关的参数值.

基于分布链修正的磁流变弹性体的物理模型

在考虑磁流变弹性体中链的方向分布的基础上,对磁流变弹性体的偶极子模型作出了修正.用局部场的方法计算了链的势能,引入了分布函数来描述链的分布,并分析了与磁场方向不一致的斜链的磁流变效应,进而通过积分叠加求得含有分布链的磁流变弹性体的磁流变效应.在磁流变弹性体的理论模型中,引入了制备磁场和基体性质等影响因素.

基于高斯混合模型的风电场群功率波动概率密度分布函数研究

如何描述风电功率波动的概率密度分布特性一直是风电联网运行分析领域的难点。在利用概率密度函数法分析风电功率波动特性的基础上,首先验证了采用多种单一分布函数模型拟合风电波动概率密度分布特性的效果较差,并根据列维定理揭示了风电场群出力波动概率密度分布特性呈现多种分布的规律;在此基础上提出采用高斯混合模型替代单一分布函数模型来拟合风电波动概率密度分布特性的方法。仿真结果表明,高斯混合模型具有良好的拟合效果,适用于描述大型风电场群出力波动的概率密度分布特性。

巴东县人工针叶同龄混交林直径分布拟合研究

基于巴东县国有林场人工针叶同龄混交林标准地的调查数据,采用三参数威布尔分布函数(Weibull)、正态分布函数、伽玛分布函数及对数正态分布函数拟合林分的直径分布,并结合卡方(λ2)检验,试图建立能够准确描述人工针叶同龄林林分直径分布规律的函数和参数,再通过建立的分布函数预测和分析林分径阶株数分布。结果表明:4种分布函数拟合林分直径分布的拟合效果Weibull分布明显优于其余3种分布函数,用Weibull分布拟合效果最好,精度高,能很好地描述针叶同龄混交林直径分布规律;研究发现Weibull分布函数参数a=5.0、b=12.132 3、c=1.821 3时,可以较准确地预测人工针叶同龄混交林林木株数;经过对林分直径株数分布预测结果分析,证明了函数的准确性和适用性较好。根据Weibull分布函数调整林分株数分布,对于提高林分质量、增强林地生产力具有一定的参考价值。

风浪耦合作用下桥塔-基础体系的极限荷载效应

为了准确地估计风浪耦合作用下桥塔-基础体系的极限荷载效应,基于统计外推法提出多种环境变量联合作用下结构极限荷载效应的统计方法.该方法根据环境变量的联合分布特性和结构的动力特性统计外推出荷载效应极值的分布函数,极限荷载效应则为给定超越概率下的荷载效应极值.利用该方法计算风浪耦合作用下某跨海大桥桥塔-基础体系的基底剪力极限荷载效应,并讨论风浪耦合效应对计算结果的影响.结果表明,该方法能够准确地估计风浪联合随机作用下结构的极限荷载效应,能够为结构设计提供合理依据.

大兴安岭次生林区优势种落叶松分布格局及竞争作用

竞争是形成特定群落结构、构成分布格局的基本驱动力之一,树种的空间分布和大小并不是相互独立的,而是广泛受到竞争过程影响。在大兴安岭设置一块具有代表性的天然次生林恢复样地,采用点格局分析中的最近邻体距离G(r)函数、双关联函数g(r)和基于个体胸径标记的点格局分析方法同时结合4种点格局零模型(完全随机模型、均值托马斯模型、随机标签模型、先决条件零模型)研究分析大兴安岭次生林区优势种落叶松不同生活史阶段的分布格局、关联性及竞争作用。研究结果显示:落叶松不同发育阶段分布格局不同、同一发育阶段不同研究尺度分布格局也不同;落叶松种群内存在潜在的竞争、且竞争作用与龄级和研究尺度有关;落叶松幼龄个体在小尺度(r<5m)下的聚集分布是由扩散限制作用和竞争作用所导致;落叶松种群内成龄与幼龄个体间有较强的正关联性、成龄个体对幼龄个体在小尺度下有明显的庇护作用;标记点格局分析方法在检测植物群落中的竞争作用时敏感性较高。

煤粒吸附瓦斯过程中的温度变化研究

为了更好地揭示煤吸附瓦斯过程中温度变化规律,设计完善了煤体吸附瓦斯温度测试系统,对煤体吸附瓦斯过程中的热效应进行了实验研究。实验结果显示,煤体吸附瓦斯过程中温度升高,吸附过程中释放能量;温度随时间的变化呈指数函数关系;吸附平衡压力越大,温度变化量和温度变化梯度越大;环境温度越高,吸附过程中温度变化量越小。

基于棉纤维长度根数分布的精梳机梳理效能分析

使用概率密度函数的基本原理,对3个纤维长度根数分布密度函数(精梳机输入小卷根数分布和落棉与精梳条的纤维长度根数分布)进行比较,导出纤维长度根数分布在梳理过程中的变化规律。讨论输入和输出纤维长度根数分布应该满足的条件。利用求解线性方程组的方法计算并得到精梳机梳棉效能的表征曲线。结果表明,利用纤维的长度根数分布计算方法能够较好地对精梳机工作效能进行细致的评价。进一步探讨纤维在梳理过程中发生断裂的表征方法,提出一种能够反映纤维在梳理中断裂程度的指示量。利用这些结论可以对精梳机加工过程进行优化并估计纤维在加工中的断裂情况,为精梳工艺设计提供重要的依据。

基于Ripley’s K函数浙江城市空间格局及其影响分析

以Ripley’sK函数为核心，通过城市区位与规模联立估计、地理权重引入、全局函数分解等手段，研究2001～2010年浙江省已有县级及以上城市空间分布的总体及局部估计问题，探讨城市空间格局与特征，以期揭示边界效应和市场潜力对浙江城市空间格局的影响机理。结果表明：①浙江省城市区位与规模的空间格局不一致，即前者是分散分布而后者是集聚分布，且随着空间尺度的增加，其分散或集聚程度逐步加强。②无论是行政边界还是海岸线，对浙江省城市区位与规模的空间分布演化有一定的负向作用。空间尺度越大，边界负效应越强。③在城市化发展过程中，浙江形成了3个各具产业特色的块状组团式城市聚集区，但边界负效应会抑制它们的发展，此时杭州、宁波将承担起服务全省经济的重要职责。④浙江城市规模因受市场潜力因素的影响会出现空间分布不均衡性。城市规模与市场潜力显著正相关，其程度却随着空间尺度的增加而减小。

油管掺液稠油泵井筒流体温度分布计算

根据传热学和能量平衡原理 ,考虑环空产出液与油管掺入液及地层之间的双重热传导作用 ,同时考虑了由流体相变导致的焦耳汤姆森效应 ,建立了稠油泵井筒流体温度分布数学模型 ,并研究了温度分布随时间的变化规律。编制了计算程序 ,该程序能用于计算任意生产时间及井筒深度下掺入液及产出液的温度。计算结果表明 ,在一定条件下 ,生产时间及焦耳汤姆森效应对井筒温度分布有明显的影响。