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1. chinaXiv:201910.00053 [pdf]

Effects of biochar on water movement characteristics in sandy soil under drip irrigation

PU Shenghai; LI Guangyong1; TANG Guangmu; ZHANG Yunshu ; XU Wanli; LI Pan; FENG Guangping; DING Feng
Subjects: Physics >> General Physics: Statistical and Quantum Mechanics, Quantum Information, etc.

Biochar addition can improve the physical and hydraulic characteristics of sandy soil. This study investigated the effects of biochar on water holding capacity and water movement in sandy soil under drip irrigation. By indoor simulation experiments, the effects of biochar application at five levels (0%, 1%, 2%, 4% and 6%) on the soil water retention curve, infiltration characteristics of drip irrigation and water distribution were tested and analyzed. The results showed that biochar addition rate was positively correlated with water holding capacity of sandy soil and soil available water. Within the same infiltration time, with an increasing amount of added biochar, the diffusion distance of the horizontal wetting front (HWF) tended to decrease, while the infiltration distance of vertical wetting front (VWF) initially declined and then rose. The features of wetted bodies changed from "broad-shallow" to "narrow-deep" type. The relationship between the transport distances of HWF and VWF and the infiltration time was described by a power function. At the same distance from the point source, the larger the amount of added biochar, the higher the soil water content. Biochar had a great influence on the water content of the layer with biochar (0–200 mm) and had some effects at 200–250 mm without biochar; but it had less influence on the soil water content deeper than 250 mm. For the application rate of biochar of 4%, most water was retained within 0–250 mm soil layer. However, when biochar application amount was high (6%), it would be helpful for water infiltration. During the improvement of sandy soil, biochar application rate of 4% in the plow layer had the best effect.

submitted time 2019-10-26 From cooperative journals:《Journal of Arid Land》 Hits1397Downloads103 Comment 0

2. chinaXiv:201910.00072 [pdf]

不确定性(原理)关系的证伪

段德龙
Subjects: Physics >> General Physics: Statistical and Quantum Mechanics, Quantum Information, etc.

为解决量子力学物理诠释的根本分歧,证明爱因斯坦对于量子力学的预测本文对海森堡不确定性(原理)关系式的数学形式进行概率分析;从个体基元过程的角度对海森堡与玻尔的电子单狭缝位置测定思想实验和爱因斯坦光子箱思想实验进行了重新检视。在数学上通过对概率分布及全概率空间的分析得到了不确定性关系被破坏的结果;对海森堡与玻尔的电子单狭缝位置测定思想实验和爱因斯坦光子箱思想实验进行的重新检视,获得了玻尔与海森堡原有论证不成立的结论。因篇幅所限未就纠缠作进一步的分析。在演绎(数学上的概率分析)与归纳(物理上的思想实验)两个方面,本文都获得了海森堡不确定性关系不成立的结果,证明了量子力学正统诠释难以保持其理论的自洽与逻辑一贯性

submitted time 2019-10-21 Hits1043Downloads96 Comment 0

3. chinaXiv:201607.00046 [pdf]

Exact Solution for Three-Dimensional Ising Model

Zhang, Degang
Subjects: Physics >> General Physics: Statistical and Quantum Mechanics, Quantum Information, etc.

Three-dimensional Ising model in zero external field is exactly solved by operator algebras, similar to the Onsager's approach in two dimensions. The partition function of the simple cubic crystal imposed by the periodic boundary condition along both $(0 1 0)$ and $(0 0 1)$ directions and the screw boundary condition along the $(1 0 0)$ direction is calculated rigorously. In the thermodynamic limit an integral replaces a sum in the formula of the partition function. A order-disorder transition in the infinite crystal occurs at a temperature $T=T_c$ determined by the condition: $\sinh\frac{2J}{k_BT_c}\sinh\frac{2(J_1+J_2)}{k_BT_c}=1$, where $(J_1 J_2 J)$ are the interaction energies in three directions, respectively. The analytical expressions for the internal energy and the specific heat are also given. It is also shown that the thermodynamic properties of 3D Ising model with $J_1=J_2$ are connected to those in 2D Ising model with the interaction energies $(J_1 J_{2D})$ by the relation $(\frac{J_{2D}}{k_BT})^*=(\frac{J}{k_BT})^*-\frac{J_1}{k_BT}$, where $x^*=\frac{1}{2}{\rm ln coth} x={\rm tanh}^{-1}(e^{-2x})$.

submitted time 2019-09-12 Hits4898Downloads1325 Comment 0

4. chinaXiv:201909.00120 [pdf]

西宁盆地4种草本和灌木植物降盐效应试验研究

李淑霞; 刘亚斌; 钟鹏; 余冬梅; 胡夏嵩; 杨幼清
Subjects: Physics >> General Physics: Statistical and Quantum Mechanics, Quantum Information, etc.

以西宁盆地长岭沟流域自建试验区为研究区,筛选出适宜当地气候条件下生长的2种灌木植物柠条锦鸡儿(Caragana korshinskii Kom.)、霸王〔Zygophyllum xanthoxylon (Bunge) Maxim.〕和2种草本植物细茎冰草(Agropyron trachycaulum cv. Slender)、紫花苜蓿(Medicago sativa Linn.)作为试验供试种,在试验区对4种植物采用单一种植和组合种植方式,探讨2种种植条件下植物根系在边坡地表以下垂直方向土体中K+、Ca2+、Na+、Mg2+、SO42-、Cl-、HCO3-、CO32-等8种易溶盐离子含量及其变化特征,评价了区内2种草本和2种灌木植物降低边坡土体盐分的能力。结果表明:单一种植细茎冰草、紫花苜蓿、柠条锦鸡儿、霸王对边坡土体中SO42-、Ca2+、Na+具有显著降低作用,草本与灌木组合Ⅰ(柠条锦鸡儿+紫花苜蓿+细茎冰草组合)和草本与灌木组合Ⅱ(霸王+紫花苜蓿+细茎冰草组合)对边坡土体中SO42、Ca2+、Mg2+、K+、Na+表现出显著降低作用;紫花苜蓿的降盐效果相对较为显著、其次为柠条锦鸡儿和细茎冰草,霸王的降盐效果不及前者显著;草本与灌木组合Ⅱ的降盐效果相对显著于草本与灌木组合Ⅰ。

submitted time 2019-09-09 From cooperative journals:《干旱区研究》 Hits2658Downloads108 Comment 0

5. chinaXiv:201907.00026 [pdf]

Exact Solution of Quantum Rabi Model

Degang Zhang
Subjects: Physics >> General Physics: Statistical and Quantum Mechanics, Quantum Information, etc.

Quantum Rabi model is exactly solved by employing the parameter-dependent unitary transformation method in the Bargmann space. The complete energy spectrum consists of two double-fold sub-energy spectra. The eigenvalue is determined by the parameter in the unitary transformation, which satisfies a highly nonlinear equation. Such the energy spectrum completely coincides with that obtained in the occupation number representation [D. Zhang, chinaXiv:201708.00168].

submitted time 2019-07-31 Hits2057Downloads168 Comment 0

6. chinaXiv:201905.00054 [pdf]

多体多自由度量子隐形传态的张量表示

征夏明
Subjects: Physics >> General Physics: Statistical and Quantum Mechanics, Quantum Information, etc.

[目的] 找到一种最普遍情况下量子隐形传态的一般表示及代数结构。 [方法] 归纳推理与演绎推理,利用多项式相乘与张量积之间的等价性发现一般规律。 [结果] 将多体单自由度或单体多自由度的量子隐形传态推广至多体多自由度,以及混合态。 [局限] 无法推广至连续谱量子态。 [结论] 预言多体多自由度单次量子隐形传态的存在,并包含了已被实验证实的所有特殊情况。

submitted time 2019-04-11 Hits5294Downloads291 Comment 0

7. chinaXiv:201905.00053 [pdf]

纠缠态判据与高阶张量可分性的充分必要条件

征夏明
Subjects: Physics >> General Physics: Statistical and Quantum Mechanics, Quantum Information, etc.

[目的] 找到高阶张量和纯态可写成多个低阶张量乘积的充要条件。 [方法] 类比推理、归纳推理,从多元函数可分离变量的充要条件出发,利用与矩阵的代数余子式的性质,最后得到一般的结论。 [结果] 证明定理及其多个等价形式。 [局限] 不适用于混合态。 [结论] 纯态是否是纠缠态的充要条件。

submitted time 2019-04-11 Hits4978Downloads246 Comment 0

8. chinaXiv:201903.00191 [pdf]

等离子体非线性手性:有螺湍流态及呼吸子

陈鹏; 杨焱; 朱建州
Subjects: Physics >> Physics of Gases, Plasmas, and Electric Discharges
Subjects: Physics >> General Physics: Statistical and Quantum Mechanics, Quantum Information, etc.

等离子体湍流(如太阳风)中体现的(矢端图)螺旋现象和信号(近似)谐振现象并不一定表示线性波动行为。不同环境下等离子体可以有不同的动力学特征,容许存在各种非线性结构。这里讨论在一定时空范围内与线性螺旋波表现类似的有单手性主导的湍动涡模态和呼吸子。前者先通过回顾最近利用扩展磁流体模型统计解特征研究太阳风中的建议得以说明;后者的具体例证还是一个开放的问题,但是我们列举各种来自水波、等离子体和玻色-爱因斯坦凝聚的信息来说明太阳风中应该存在这样的结构。

submitted time 2019-03-31 Hits7206Downloads405 Comment 0

9. chinaXiv:201903.00154 [pdf]

内蒙古入境旅游目的地竞争力空间格局特征 与影响因素

李文龙; 吕君; 王珊
Subjects: Physics >> General Physics: Statistical and Quantum Mechanics, Quantum Information, etc.

入境旅游作为我国文化传播与交流的重要载体对于我国文化建设与产业发展不可或缺;以内蒙古89个县域为研究对象,从资源吸引力、产业实力、接待组织能力三个维度构建评价框架与指标体系,运用模糊层次分析法、函数模型法、ArcGIS Voronoi图分析、障碍度模型等方法,对入境旅游竞争力进行研究。研究结论:(1)研究区入境旅游资源吸引力与产业实力呈现出西部高于东部,东部高于中部的空间格局,组织接待能力空间呈现破碎化特征。(2)竞争力呈现西部高于东部,东部高于中部的空间格局,且竞争力较强的县域多分布在内蒙古边缘区。(3)强竞争力与较强竞争力县域在呼和浩特、包头、鄂尔多斯和赤峰、通辽、锡林浩特形成两大竞争力集聚区。(4)准则层中障碍度指数由大到小排名为:旅游资源吸引力、产业实力、接待能力;指标层障碍度来看,位于前5名的单项指标分别是:旅游资源质量,旅游外汇收入,旅游经济联系强度,住宿餐饮业从业人员数量,国际旅行社数。(5)旅游资源吸引力与旅游组织接待能力相差悬殊是造成内蒙古入境旅游目的地旅游竞争力不平衡的主要原因,旅游产业实力差异加剧了竞争力的差异化。

submitted time 2019-03-07 From cooperative journals:《干旱区地理》 Hits5806Downloads245 Comment 0

10. chinaXiv:201901.00078 [pdf]

“一带一路”下旅游文化产业的大数据体系架构与实施途径研究

杨更生; 王东; 孙彬
Subjects: Physics >> General Physics: Statistical and Quantum Mechanics, Quantum Information, etc.

本文探究“一带一路”旅游大数据的产业创新体系架构,明确“旅游文化建设、旅游消费习性培育、跨域资源协作”等产业创新路径,明晰沿线各国的文化融合途径,构建以“文化通”为内涵的旅游大数据体系。通过文献梳理、质化研究和实时数据分析,建构适用性旅游大数据架构,解决“一带一路”旅游文化产业中的信息稀疏、习性碎片化和诚信不足等现实困难,助力沿线各国的旅游发展新局面。借鉴应用系统工程中霍尔三维支撑理论,从知识、时间和逻辑三个维度,搭建新时代条件下旅游业态的以价值集聚、诚信保护和旅游文化传承为核心的创新途径支持体系,为旅游经济管理理论,提供了一个全新的研究视角。

submitted time 2019-01-11 From cooperative journals:《干旱区地理》 Hits5029Downloads318 Comment 0

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