Stable

摘要： All the four fundamental interactions describe phenomena of attraction except one, the electromagnetic interaction, which also describes phenomena of repulsion. If the matter that constitutes our universe is subject to the same physical laws, then the four fundamental interactions should all express the same phenomena: either attraction or repulsion. In this work, a new approach called the binding cord approach was introduced to describe the electromagnetic interaction. In this new approach, electromagnetic repulsion will be described as a consequence of attraction.

摘要： In this paper, we introduce high-order finite volume methods for the multi-term time fractional sub-diffusion equation. The time fractional derivatives are described in Caputo’s sense. By using some operators, we obtain the compact finite volume scheme have high order accuracy. We use a compact operator to deal with spatial direction;then we can get the compact finite volume scheme. It is proved that the finite volume scheme is unconditionally stable and convergent in L∞-norm. The convergence order is O(τ2-α + h4). Finally, two numerical examples are given to confirm the theoretical results. Some tables listed also can explain the stability and convergence of the scheme.

摘要： All-inorganic perovskite solar cells(PVSCs)have drawn widespread attention for its superior thermal stability.Carbon-based devices are promising to demonstrate excellent long-term operational stability due to the hydrophobicity of carbon materials and the abandon of organic holetransporting materials(HTMs).However,the difficulty to control the crystallinity process and the poor morphology leads to serious non-radiative recombination,resulting in low V_(OC)and power conversion efficiency(PCE).In this article,the crystal formation process of all-inorganic perovskites is controlled with a facile composition engineering strategy.By bromide incorporation,high-quality perovskite films with large grain and fewer grain boundaries are achieved.As-prepared perovskite films demonstrate longer carrier lifetime,contributing to lower energy loss and better device performance.Fabricated carbon-based HTM-free PVSCs with CsPbI_(2.33)Br_(0.67) perovskite realized champion PCE of 12.40%,superior to 8.80%of CsPbI_(3)-based devices,which is one of the highest efficiencies reported for the carbon-based all-inorganic PVSCs to date.The high V_(OC) of 1.01 V and FF of 70.98% indicate the significance of this composition engineering method.Moreover,fabricated carbon-based devices exhibit excellent stability,and unencapsulated device retains over 90%of its initial efficiency under continuous one sun illumination for 250 h in N_(2) atmosphere and keeps~84%of its original value after stored in ambient environment with RH 15–20% for 200 h.This work provides a facile way to fabricate high-performance and stable carbon-based all-inorganic PVSCs.

摘要： 目的:探讨STABLE救护模式在危重新生儿转运护理中的应用效果.方法:比较了541例采用STABLE救护模式对危重新生儿进行转运前后的血糖、体温、呼吸、血压、血气,并且在转运过程中倾注感情精心呵护支持.结果:转运成功率100％,没有一位婴儿在转运过程发生意外.结论:采用STABLE模式为危重新生儿进行转运,成功率很高,是救护危重新生儿的强力保障.

摘要： The intrinsic characteristics of single photons became critical issues since the early development of quantum mechanics. Nowadays, acting as flying qubits, single photons are shown to play important roles in the quantum key distribution and quantum networks. Many different single photon sources (SPSs) have been developed. Point defects in silicon carbide (SiC) have been shown to be promising SPS candidates in the telecom range. In this work, we demonstrate a stable SPS in an epitaxial 3CSiC with the wavelength in the near C-band range, which is very suitable for fiber communications. The observed SPSs show high single photon purity and stable fluorescence at even above 400 K. The lifetimes of the SPSs are found to be almost linearly decreased with the increase of temperature. Since the epitaxial 3C-SiC can be conveniently nanofabricated, these stable near Cband SPSs would find important applications in the integrated photonic devices.

摘要： In this study, the experiments on field were conducted to examine the change in the content of soil organic carbon (SOC), its C-13 stable isotope composition (δ 13C) and some main physical, chemical parameters (soil moisture, pH, soil density, content of humic, fulvic, total N, total P, total K) in alluvial soil of Dan Phuong region—Vietnam at a depth of 0 - 30 cm when we changed the regime from 2 maize -1 rice crop to 2 rice - 1 maize crop per 1 year. In addition to analyzing the main parameters in soil, C content and its δ 13C value in parts of rice and maize (root, stem and leaf) were also analyzed to assess the contribution of plant residues on soil organic carbon content after harvest. The experiment was carried out in 2016-2017 on the field with the traditional farming method of local farmers along with the tropical monsoon weather conditions of the North-Vietnam. The results showed that SOC had positive correlation with total N, total P parameters and negative correlation with δ 13C values of soil samples at two layers (0 - 15 cm and 15 - 30 cm). The average of total dry biomass (stem, stump + roots and leaf parts) per 1 rice and 1 maize crop was 10.64 Mg/ha and 9.09 Mg/ha, respectively. The average of δ 13C value of rice (C3 plant) was -29.78‰ and its value of maize (C4 plant) was -12.61‰. The new plant (rice) contributes to the total soil organic carbon content from 11.31% to 44.14% at the 0 - 15 cm layer and from 6.55% to 11.31% at the 15 - 30 cm layer in one-year experiment period.

摘要： The science that underpins our knowledge and understanding of Isotope-Based Hydrograph separation (IHS) has gained grounds, over the last few decades, in the identification of streamflow sources. However, challenges still exist in identifying appropriate tracers and the right combination of end-members for the IHS process. In a two-component IHS analysis, the application of the dual isotopes tracers, δ18O and (or) δ2H, is regarded as the simplest method. We undertook an IHS study within a nested system of eight Prairie watersheds located in South central Manitoba, Canada. The work evaluated about 17,000 results emanating from the application of a combination of two potential tracers (δ18O and δ2H) and eight each of potential “old” and “new” water end-members in a two-component IHS process. The outcome showed occurrences of many mathematically possible but hydrologically unacceptable IHS results. The observation was particularly predominant within relatively larger perennial sub-catchments of the watershed. It is also shown that inter-site sub-catchment isotopic end-member transferability is possible within watersheds of similar physio-hydrographic characteristics. We suggest that a careful evaluation of the physio-hydrographic characteristics of catchments be considered in IHS studies in addition to the recommended guidelines in the selection of tracers and end-members.

摘要： The newly discovered Baogudi gold district is located in the southwestern Guizhou Province,China,where there are numerous Carlin-type gold deposits.To better understand the geological and geochemical characteristics of the Baogudi gold district,we carried out petrographic observations,elemental analyses,and fluid inclusion and isotopic composition studies.We also compared the results with those of typical Carlin-type gold deposits in southwestern Guizhou.Three mineralization stages,namely,the sedimentation diagenesis,hydrothermal(main-ore and late-ore substages),and supergene stages,were identified based on field and petrographic observations.The main-ore and late-ore stages correspond to Au and Sb mineralization,respectively,which are similar to typical Carlin-type mineralization.The mass transfer associated with alteration and mineralization shows that a significant amount of Au,As,Sb,Hg,Tl,Mo,and S were added to mineralized rocks during the main-ore stage.Remarkably,arsenic,Sb,and S were added to the mineralized rocks during the late-ore stage.Element migration indicates that the sulfidation process was responsible for ore formation.Four types of fluid inclusions were identified in ore-related quartz and fluorite.The main-ore stage fluids are characterized by an H2O–NaCl–CO2–CH4±N2system,with medium to low temperatures(180–260°C)and low salinity(0–9.08%NaCl equivalent).The late-ore stage fluids featured H2O–NaCl±CO2±CH4,with low temperature(120–200°C)and low salinity(0–7.48%Na Cl equivalent).The temperature,salinity,and CO2and CH4concentrations of ore-forming fluids decreased from the main-ore stage to the late-ore stage.The calculated δ^13C,d D,and δ^18O values of the ore-forming fluids range from-14.3 to-7.0%,-76 to-55.7%,and 4.5–15.0%,respectively.Late-ore-stage stibnite had δ^34S values ranging from-0.6 to 1.9%.These stable isotopic compositions indicate that the ore-forming fluids originated mainly from deep magmatic hydrothermal fluids,with minor contributions from strata.Collectively,the Baogudi metallogenic district has geological and geochemical characteristics that are typical of Carlin-type gold deposits in southwest Guizhou.It is likely that the Baogudi gold district,together with other Carlin-type gold deposits in southwestern Guizhou,was formed in response to a single widespread metallogenic event.

摘要： In this paper, a block method with one hybrid point for solving Jerk equations is presented. The hybrid point is chosen to optimize the local truncation errors of the main formulas for the solution and the derivative at the end of the block. Analysis of the method is discussed, and some numerical examples show that the proposed method is efficient and accurate.

摘要： This work presents a Principal Component Analysis (PCA) study using Pbisotope signatures and U, Th and Pb concentrations from groundwater, sediments and rocks (granites and orthogneisses) of the Complex of Lagoa Real (Bahia, Brazil). This area is naturally enriched in U and Th, with the occurrence of Pb derived from the radioactive decay of the elements (238U, 235U and 232Th) in the form of their stable isotopes 206Pb, 207Pb and 208Pb in addition to the natural isotope 204Pb. Sampling was carried out in the rainy season (December to January) and the points were selected according to regional hydrology and geology. Thirty samples were analyzed: 12 of groundwater (AP) and 18 of sediments (S). The results show that the use of isotopic ratios allows discrimination between geogenic and anthropogenic samples. This information is not obtained using only the analysis of concentration data. Statistically, the isotopic data of Pb stand out as an efficient tool in the characterization of sources in the scenario investigated, allowing an effective environmental monitoring and a better management of the mining activities.

摘要： 本发明公开了一种基于p‑stable局部敏感哈希检索数据样式的多点地质统计建模方法，采用分块网格框架计算数据样式(事件)的特征向量，然后使用p‑stable局部敏感哈希方法将这些特征向量散列到多个哈希表。建模时提取待估点处的数据事件的特征向量并进行p‑stable局部敏感哈希计算，得到数据事件哈希桶号，取出这些哈希桶中所有的数据样式构建目标样式数据库，比较数据事件与目标样式数据库中所有数据样式的曼哈顿距离，得到最相似数据事件。而SIMPAT算法在模拟过程中，需将待估点处的数据事件与样式数据库中所有数据样式进行相似性计算。相比SIMPAT算法，本发明应用局部敏感哈希检索技术极大地提高了多点地质统计学建模算法的效率。

摘要： 本发明公开了基于p‑stable lsh的时空伴随查询方法，包括：获取时空伴随对象轨迹的离线数据，对所述离线数据进行预处理，生成多维向量数据；基于p‑stable lsh算法将所述多维向量数据生成离线的对象轨迹的数字签名；将所述离线的数字签名同步至在线的数据查询大数据库中；基于所述在线的数据查询大数据库，构建快速检索工具，根据所述数字签名查询相似目标对象。采用p‑stable lsh算法对整个轨迹做hash变换，使得轨迹维度大大降低，将复杂的伴随分析转变成指纹(hash值)比对，极大地提高了查询效率及查询效果，同时采用geohash做经纬度降维，对一定范围内的经纬度误差可以完成归一化处理。此外，采用在线和离线结合的方式，极大的提升了用户体验。

摘要： 本发明公开了一种基于p‑stable局部敏感哈希检索数据样式的多点地质统计建模方法，采用分块网格框架计算数据样式(事件)的特征向量，然后使用p‑stable局部敏感哈希方法将这些特征向量散列到多个哈希表。建模时提取待估点处的数据事件的特征向量并进行p‑stable局部敏感哈希计算，得到数据事件哈希桶号，取出这些哈希桶中所有的数据样式构建目标样式数据库，比较数据事件与目标样式数据库中所有数据样式的曼哈顿距离，得到最相似数据事件。而SIMPAT算法在模拟过程中，需将待估点处的数据事件与样式数据库中所有数据样式进行相似性计算。相比SIMPAT算法，本发明应用局部敏感哈希检索技术极大地提高了多点地质统计学建模算法的效率。

摘要： 一种基于级联过程的alpha-stable乘数网络流量多分形模型的建立方法，包括：(1)二项式级联，设定每一层保持原始尺度不变，对每个分割出来的区间再进行同样的分割，直到第N层；(2)乘数分布估计，给定第N层的数据