Plasmon reflection reveals local electronic properties of natural graphene wrinkles

We systematically studied surface plasmons reflection by graphene wrinkles with different heights on SiC substrate.Combined with numerical simulation, we found that the geometry corrugation of a few nanometer height wrinkle alone does not causes a reflection of graphene plasmons. Instead, the separated wrinkle from substrate exhibits a nonlinear spatial Fermi energy distribution along the wrinkle, which acts as a heterojunction. Therefor a higher graphene wrinkle induces a stronger damped region when propagating graphene surface plasmons encounter the wrinkle and get reflected.

Observation of large in-plane anisotropic transport in van der Waals semiconductor Nb_(2)SiTe_(4)

Two-dimensional(2D)van der Waals material is a focus of research for its widespread application in optoelectronics,memories,and spintronics.The ternary compound Nb_(2)SiTe_(4) is a van der Waals semiconductor with excellent air stability and small cleavage energy,which is suitable for preparing a few layers counterpart to explore novel properties.Here,properties of bulk Nb_(2)SiTe_(4) with large in-plane electrical anisotropy are demonstrated.It is found that hole carriers dominate at a temperature above 45 K with a carrier active energy of 31.3 meV.The carrier mobility measured at 100 K is about 213 cm^(2)·V^(-1)·s^(-1) in bulk Nb_(2)SiTe_(4),higher than the reported results.In a thin flake Nb_(2)SiTe_(4),the resistivity ratio between the crystalline axes of a and b is reaching about 47.3 at 2.5 K,indicating that there exists a large anisotropic transport behavior in their basal plane.These novel transport properties provide accurate information for modulating or utilizing Nb_(2)SiTe_(4) for electronic device applications.

Tunable Superconductivity in 2H-NbSe2 via In Situ Li Intercalation

Using the newly-developed solid ionic gating technique,we measure the electrical transport property of a thinflake NbSe2 superconductor(Tc=6.67 K)under continuous Li intercalation and electron doping.It is found that the charge-density-wave transition is suppressed,while at the same time a carrier density,decreasing from7×10^14 cm^-2 to 2×10^14 cm^-2 also occurs.This tunable capability in relation to carrier density is 70%,which is 5 times larger than that found using the liquid ionic gating method[Phys.Rev.Lett.117(2016)106801].Meanwhile,we find that the scattering type of conduction electrons transits to the s-d process,which may be caused by the change of the occupied states of 4 d-electrons in Nb under the condition of Li intercalation.Simultaneously,we observe a certain decrement of electron-phonon coupling(EPC),based on the electron-phonon scattering model,in the high temperature range.Based on data gathered from in situ measurements,we construct a full phase diagram of carrier density,EPC and Tc in the intercalated NbSe2 sample,and qualitatively explain the variation of Tc within the BCS framework.It is our opinion that the in situ solid ionic gating method provides a direct route to describing the relationship between carrier density and superconductivity,which is helpful in promoting a clearer understanding of electronic phase competition in transition metal dichalcogenides.

New Type of Nitrides with High Electrical and Thermal Conductivities

The nitrogen dimer as both a fundamental building unit in designing a new type of nitrides, and a material gene associated with high electrical and thermal conductivities is investigated by first principles calculations.The results indicate that the predicted Si N4 is structurally stable and reasonably energy-favored with a striking feature in its band structure that exhibits free electron-like energy dispersions. It possesses a high electrical conductivity（5.07 × 10^5 S/cm） and a high thermal conductivity（371 W/m·K） comparable to copper. The validity is tested by isostructural Al N4 and Si C4. It is demonstrated that the nitrogen dimers can supply a high density of delocalized electrons in this new type of nitrides.

Regional Effect of APS-sEPS on Intestinal Structure and Mucosal Immunity in Mice

[Objectives]The aim of this study was to investigate the effects of APS-sEPS(a polysaccharide compound of Astragalus polysaccharides and sulfated Epimedium polysaccharide)on intestinal mucosal immunity and structural morphology.[Methods]Firstly,the diarrhea model was established using the optimal dose of magnesium sulfate in mice.Then,the diarrhea mice were randomly divided into three groups and given either physiological saline(diarrhea model group)or injected with APS-sEPS or APS.The normal mice were selected as a control group.After administration,the duodenum,jejunum and ileum were processed microtome section,and observed for describing the small intestine morphology,villus height and crypt depth.The tissue homogenates of the duodenum,jejunum and ileum were gathered to detect the changes of sIgA,IL-4 and IL-10.[Results]The results indicated that APS-sEPS could effectively relieve diarrhea in mice.In the APS-sEPS group,the villus heights of duodenum,jejunum and ileum were increased and the depth of crypt was reduced.The contents of IL-4,IL-10 and sIgA in jejunum and ileum in APS-sEPS group were significantly higher than that in the control group(P<0.05).[Conclusions]These results indicated that APS-sEPS promoted the recovery of intestinal morphological structure and enhanced the mucosa immunity of the small intestine.

Thoughts and Practice of Design,Fabrication and Application for Traditional Chinese Medicines' Functional Separation of Material Substance

1.The Chemical Composition of Traditional Chinese Medicines'substance Chinese medicine and its compound is essentially a special,macrocosm drug group,which was made of a different chemical composition of the Chemical mother nucleus.Chinese medicine effective components such as alkaloids,flavonoids,glycosides,etc.,which molecular weight is less than

基于膜一体化技术的中药制药流程再造

中药制造业属于高能耗、高物耗(特别是水资源)、以热加工为主的过程工业。“双碳”目标下,中药制药流程的精制、浓缩、挥发油富集、制药工艺用水及注射剂安全保障、溶媒回收与废水处理等工序都面临严重的挑战。膜科技具有重大国家科技战略需求,是我国中药制药工业亟需推广的高新技术,多种膜过程的集成,几乎可与中药制药流程的各主要工序兼容。本工作提出面向中药绿色制造过程的特种膜系列概念,并就“双碳”目标下,采用中药特种“膜一体化”绿色制造技术,再造中药制药流程的有关科学技术问题开展讨论,其中涉及基于本课题组提出的中药“溶液环境”特征参数监控技术的浓缩能耗计算模式,以玉屏风散为模型药物,所获取的膜(反渗透、膜蒸馏)浓缩与蒸发浓缩的能量效率对比结果。提出了中药制药流程“全生命周期碳中和”的概念;以膜科技为核心的分离技术集成是实现中药工业生态园的重要途径。

Short body length phenotype is compensated by the upregulation of nidogen family members in a deleterious nid1a mutation of zebrafish

To decode biological processes,interfering with gene functions is a widely used strategy.There are a number of ways to interfere with gene functions.For instance,small interfering RNAs（siRNAs）are used to induce mRNA degradation;morpholinos are used to block protein translation（Nasevicius and Ekker,2000）;