Transport properties of single channel quantum wires with an impurity: Influence of finite length and temperature on average current and noise

The inhomogeneous Tomonaga Luttinger liquid model describing an interacting quantum wire adiabatically coupled to non-interacting leads is analyzed in the presence of a weak impurity within the wire. Due to strong electronic correlations in the wire, the effects of impurity backscattering, finite bias, finite temperature, and finite length lead to characteristic non-monotonic parameter dependencies of the average current. We discuss oscillations of the non-linear current voltage characteristics that arise due to reflections of plasmon modes at the impurity and quasi Andreev reflections at the contacts, and show how these oscillations are washed out by decoherence at finite temperature. Furthermore, the finite frequency current noise is investigated in detail. We find that the effective charge extracted in the shot noise regime in the weak backscattering limit decisively depends on the noise frequency $\omega$ relative to $v_F/gL$, where $v_F$ is the Fermi velocity, $g$ the Tomonaga Luttinger interaction parameter, and $L$ the length of the wire. The interplay of finite bias, finite temperature, and finite length yields rich structure in the noise spectrum which crucially depends on the electron-electron interaction. In particular, the excess noise, defined as the change of the noise due to the applied voltage, can become negative and is non-vanishing even for noise frequencies larger than the applied voltage, which are signatures of correlation effects.Comment: 28 pages, 19 figures, published version with minor change

Past distribution of Tilia-feeding Phyllonorycter micromoth (Lepidoptera: Gracillariidae) in the Russian Far East based on survey of historical herbarium

Distribution data of Tilia-feeding Phyllonorycter in the Russian Far East have been retrieved from a century-old Tilia herbarium stored in Vladivostok. Overall, 280 typical mines of Phyllonorycter, some with larvae and pupae, were found on 61 out of 799 herbarized specimens of Tilia spp. collected in Khabarovskii krai and Primorskii krai. For the first time, the presence of Tilia-feeding Phyllonorycter has been documented in Amurskaya oblast and Jewish Autonomous oblast. High densities of the leafminer have been recorded on Tilia amurensis sampled in Khabarovskii krai and Primorskii krai between 1937 and 2005 suggesting a population dynamics with recurrent outbreaks. Our results confirm the importance of historical herbarium collections in studying trophic interactions and invasion ecology of folivore organisms

Rotator cuff tendon ruptures (literature review)

Rotator cuff injury is a common pathology: up to 20 % of the population over 45 years of age has ruptures of varying severity, and up to 40 % of these ruptures are large and massive. The gradual development of tendon degeneration and fatty degeneration of muscle tissue and the asymptomatic course of the disease often lead to late medical attention when secondary arthropathy of the shoulder joint develops. With age, the probability of having a rupture increases, reaching 51 % in people over  80  years of age. The main diagnostic tools are radiography and  magnetic resonance imaging of the shoulder joint combined with clinical examination. Conservative treatment for massive injuries is ineffective, and the risk of worsening rotator cuff tendinopathy to rupture reaches 54 %. There are three main directions in the surgery of rotator cuff injuries: tendon reconstruction or replacement of their defect with grafts; muscle transfer; shoulder arthroplasty. Subacromial balloon spacer and tenogenic patches are also used. Each of these methods has a number of disadvantages and limitations. The frequency of repeated ruptures of reconstructed tendons reaches 45 %. Muscle transfer is extremely demanding on the skill of the surgeon and is associated with high risks of neurological complications. Arthroplasty imposes a number of significant restrictions on the patient, reducing the  quality of life, and prosthesis components wear increases the risk of complications, especially during revision interventions. The use of the subacromial spacer is limited by its high cost and lack of  long-term follow-up of treatment outcomes. Tenogenic patches have not undergone clinical trials, being an experimental technique. There is no single approach to the treatment of massive rotator cuff ruptures. The results are contradictory, the advantages of each of the methods are balanced by their disadvantages, which provides a wide window of opportunity in the studying, optimizing classical and introducing new methods of treatment of this patholog

Electron transport through a mesoscopic metal-CDW-metal junction

In this work we study the transport properties of a finite Peierls-Fr\"ohlich dielectric with a charge density wave of the commensurate type. We show that at low temperatures this problem can be mapped onto a problem of fractional charge transport through a finite-length correlated dielectric, recently studied by Ponomarenko and Nagaosa [Phys. Rev. Lett {\bf 81}, 2304 (1998)]. The temperature dependence of conductance of the charge density wave junction is presented for a wide range of temperatures.Comment: Latex, Revtex 3.0, 7 pages, 2 EPS figures (uses epfs

Stylistic devices as means of forming discursive features of advertising minitexts (exemplified by English economic and political media sources)

The article is devoted to functional and stylistic features of advertising minitexts in English economic and political mass media and Internet sources. The scientific relevance of the topic is proved by the significant role of advertising in building up not only market relations but also cultural stereotypes and public opinion. Besides, the necessity arises to reveal the human linguistic consciousness potential of integrating different meanings and small forms of their verbalization, as the trend towards contracting speech acts is gaining momentum in both oral and written communication. Hence, advertising texts make a proper object of analysis since the need for quick catching of the customers attention and saving money on publication space determines advertisements small volume. The authors set the purpose of analysing the stylistic features of advertising minitexts in economic and political sources in terms of the formation of their discursive features. Methods of discourse functional analysis, descriptive and contextual analyses are implemented thereto. The article addresses the issue of correlation between text and discourse with regard to the advertising linguistic status, types of advertising texts, extralinguistic factors (including psychographic and demographic profiles of consumers) determining the choice of means that actualise advertising discourse functions. The analysis focuses on the expressive means forming peculiar advertising stylistics and special pragmatic increments aimed at making efficient impacts on the recipient. The findings of the empiric analysis are presented in reference to such expressive means as metaphors, allusions, wordplay, antithesis, etc. The prevalence of metaphors, epithets and hyperbole as the most frequent stylistic devices in advertising discourse has been revealed. The authors conclude that discursive features of the texts under analysis are actualized in pragmasemantic increments which are not inferred from speech elements direct meanings alone but are synergistically formed in advertising functional space in the course of text generation and perception based on the communicating parties living backgrounds

Our First experience of Using Biodegradable Implants in Latarjet – Bristow Surgical Procedure at Chronic Posttraumatic Anterior Shoulder Insta

Background. Multi-layer spiral computed tomography shows that the main cause of shoulder instability is glenoid cavity bone defect. The aim of our research was to assess the effectiveness and safety of biodegradable implants in the treatment of patients with chronic posttraumatic anterior shoulder instability under conditions of bone defect of glenoid cavity margin by the restoration of anatomic shape and structure of scapula articular surface.Materials and methods. We performed a pilot study based on the results of surgical treatment of 7 patients using 4.5 mm biodegradable compressing screws. In preoperative period, all patients had standard two-dimensional X-rays and MSCT with 3D-reconstruction. In postoperative period, all patients had check-up X-ray right after the surgery and MRI in 3 months after the surgery.Results. The results of the treatment were assessed by common clinical criteria, functional criteria, X-ray evidence and intraand postoperative complications. We registered strong functioning of an arm and an increase in the range of motions. Data from Rowe/Zarins and DASH questionnaires showed that the patients totally recovered. X-ray evidence showed consolidation of non-free autograft to the zone of scapula bone defect without osteolysis or widening of a drilled hole. We did not observe either a failure of union, or any formation of false joint, or any screw fractures in bone tissue. Beyond that, we did not observe any complication in postoperative period and early postoperative complications in particular.Conclusion. Pilot study with use of modern biodegradable implants in osteoplastic stabilization of shoulder joint at recurring instability showed their effectiveness and safety in patients of young and active working age. However, considering small number of patients in pilot study we cannot extrapolate our results to all similar and analogue cases of using biodegradable implants. In this regard, it is necessary to perform major multicenter clinical randomized study for further long-term observation and detection of possible unwanted side effects

Atomically thin boron nitride: a tunnelling barrier for graphene devices

We investigate the electronic properties of heterostructures based on ultrathin hexagonal boron nitride (h-BN) crystalline layers sandwiched between two layers of graphene as well as other conducting materials (graphite, gold). The tunnel conductance depends exponentially on the number of h-BN atomic layers, down to a monolayer thickness. Exponential behaviour of I-V characteristics for graphene/BN/graphene and graphite/BN/graphite devices is determined mainly by the changes in the density of states with bias voltage in the electrodes. Conductive atomic force microscopy scans across h-BN terraces of different thickness reveal a high level of uniformity in the tunnel current. Our results demonstrate that atomically thin h-BN acts as a defect-free dielectric with a high breakdown field; it offers great potential for applications in tunnel devices and in field-effect transistors with a high carrier density in the conducting channel.Comment: 7 pages, 5 figure

Comorbidity and syntropy of benign proliferative diseases of the female reproductive system: non-genetic, genetic, and epigenetic factors (review)

To establish common risk factors for the development of benign proliferative diseases of the female reproductive system (endometriosis, endometrial hyperplasia, and uterine leiomyoma