Atomic Diffusivities of Yttrium, Titanium and Oxygen Calculated by Ab Initio Molecular Dynamics in Molten 316L Oxide-Dispersion-Strengthened Steel Fabricated via Additive Manufacturing.

Oxide-dispersion-strengthened (ODS) steels have long been viewed as a prime solution for harsh environments. However, conventional manufacturing of ODS steels limits the final product geometry, is difficult to scale up to large components, and is expensive due to multiple highly involved, solid-state processing steps required. Additive manufacturing (AM) can directly incorporate dispersion elements (e.g., Y, Ti and O) during component fabrication, thus bypassing the need for an ODS steel supply chain, the scale-up challenges of powder processing routes, the buoyancy challenges associated with casting ODS steels, and the joining issues for net-shape component fabrication. In the AM process, the diffusion of the dispersion elements in the molten steel plays a key role in the precipitation of the oxide particles, thereby influencing the microstructure, thermal stability and high-temperature mechanical properties of the resulting ODS steels. In this work, the atomic diffusivities of Y, Ti, and O in molten 316L stainless steel (SS) as functions of temperature are determined by ab initio molecular dynamics simulations. The latest Vienna Ab initio Simulation Package (VASP) package that incorporates an on-the-fly machine learning force field for accelerated computation is used. At a constant temperature, the time-dependent coordinates of the target atoms in the molten 316L SS were analyzed in the form of mean square displacement in order to obtain diffusivity. The values of the diffusivity at multiple temperatures are then fitted to the Arrhenius form to determine the activation energy and the pre-exponential factor. Given the challenges in experimental measurement of atomic diffusivity at such high temperatures and correspondingly the lack of experimental data, this study provides important physical parameters for future modeling of the oxide precipitation kinetics during AM process.

Pulmonary mucormycosis diagnosed by ultrasound guided percutaneous biopsy: A case series.

Pulmonary mucormycosis is a rare but highly lethal fungal infection, usually affecting immunocompromised patients. Pulmonary mucormycosis was also a critical problem that complicated the later part of the clinical course of COVID-19 in India. Early diagnosis of the disease, combined with aggressive treatment, is crucial for patient survival. Fibreoptic bronchoscopy is a useful procedure for diagnosis of pulmonary mucormycosis, but image-guided percutaneous biopsy efficiently samples lesions abutting the chest wall. Biopsy is more yielding than cultures and imaging guided biopsy is required for lesions that cannot be microbiologically confirmed by fibreoptic bronchoscopy. We present a case series of four patients of pulmonary mucormycosis in whom ultrasound guided biopsy clinched the diagnosis. All the four patients were poor surgical candidates and underwent medical management with antifungal agents, and had successful clinical recovery and radiological resolution. Our case series illustrates the utility of ultrasound guided percutaneous biopsy as a diagnostic tool for sampling cavitatory disease due to pulmonary mucormycosis, when fibreoptic bronchoscopy failed to yield a diagnosis and the beneficial role antifungal agents as salvage therapy in poor surgical candidates.

Assessing the effectiveness and safety of transbronchial lung cryobiopsy utilizing a flexible bronchoscope with an endobronchial blocker in diffuse parenchymal lung lesions.

Transbronchial lung cryobiopsy (TBLC) with flexible bronchoscope represents an encouraging modality to obtain a larger size specimen without crush artifact, and a higher diagnostic yield in patients with diffuse parenchymal lung lesions/diseases as compared to conventional transbronchial lung biopsy, and fewer complications as opposed to surgical lung biopsy. Artificial airway is preferred as it provides better airway protection in cases of severe bleeding. Although various researchers have published data on different modalities, the data is not sufficient to standardize a single technique. This study describes the procedural technique, safety, and yield of TBLC using a flexible bronchoscope with an endobronchial blocker. We performed a retrospective analysis of 100 consecutive patients who underwent TBLC using flexible bronchoscopy from May 2018 to June 2022. TBLC samples were obtained under moderate sedation without the use of artificial airway or fluoroscopy. Among the 100 patients, the majority were male (63%). The mean age of the enrolled patients was 44.43±15.92 years. The predominant diagnoses in our study were hypersensitivity pneumonitis (27%), followed by sarcoidosis (12%) and tuberculosis (10%). We obtained alveolated lung tissue in 90 out of 100 cases with a median biopsy size of 5 mm (in greatest dimension, interquartile range 5-4 mm), resulting in a specific histopathological diagnosis in 82 cases. The most frequent complications were bleeding and pneumothorax (13%). Mild bleeding occurred in 58% of the patients, and moderate bleeding occurred in 20% of the patients. There was no episode of severe/life-threatening bleeding. None of the patients required intensive care unit admission or endotracheal intubation. In conclusion, the use of TBLC through flexible bronchoscopy with an endobronchial blocker emerges as a minimally invasive, secure, time-efficient, and readily reproducible technique. Significantly, this procedure can be seamlessly executed in the bronchoscopy suite, eliminating the requirement for an artificial airway or general anesthesia.

A Review on Progress, Challenges, and Prospects of Material Jetting of Copper and Tungsten.

Copper (Cu) and tungsten (W) possess exceptional electrical and thermal conductivity properties, making them suitable candidates for applications such as interconnects and thermal conductivity enhancements. Solution-based additive manufacturing (SBAM) offers unique advantages, including patterning capabilities, cost-effectiveness, and scalability among the various methods for manufacturing Cu and W-based films and structures. In particular, SBAM material jetting techniques, such as inkjet printing (IJP), direct ink writing (DIW), and aerosol jet printing (AJP), present a promising approach for design freedom, low material wastes, and versatility as either stand-alone printers or integrated with powder bed-based metal additive manufacturing (MAM). Thus, this review summarizes recent advancements in solution-processed Cu and W, focusing on IJP, DIW, and AJP techniques. The discussion encompasses general aspects, current status, challenges, and recent research highlights. Furthermore, this paper addresses integrating material jetting techniques with powder bed-based MAM to fabricate functional alloys and multi-material structures. Finally, the factors influencing large-scale fabrication and potential prospects in this area are explored.

Factors affecting the treatment outcome of injection based shorter MDR-TB regimen at a referral centre in India.

Rifampicin-resistant/multidrug-resistant tuberculosis (RR/MDR-TB) is a significant burden on global tuberculosis (TB) prevention and eradication efforts. MDR-TB can be treated, but it is expensive, takes a long time (typically two years) and contains potentially toxic drugs. Under certain conditions, the WHO recommends standard regimens lasting 9 to 11 months rather than individual regimens lasting at least 18-20 months. The current study sought to identify factors associated with treatment outcomes in RR/MDR-TB patients receiving an injection-based regimen for 9-11 months. This ambispective (prospective and retrospective) observational study was conducted at a tertiary tuberculosis institute in New Delhi, India. Between February 2021 and March 2022, patients with RR/MDR-pulmonary TB who received an injection-based shorter regimen were enrolled. Factors related to treatment outcomes were investigated and compared in patients who had a successful outcome versus those who did not. A total of 55 patients were enrolled, with 50.91% being successful (cured/treatment completed) and 49.09% failing (including failure, lost to follow up, death, and regimen change). The following factors were significantly associated with the unsuccessful outcome, according to univariate analysis: BMI (<18.5 kg/m2), anaemia, previous anti-TB treatment, bilateral chest X-ray involvement, and far advanced disease on chest X-ray. BMI (<18.5 kg/m2), anaemia, and far advanced disease on chest X-ray were all significantly associated with mortality. Anaemia was associated with an unsuccessful outcome (p=0.049) and mortality (p=0.048) in the multiple logistic regression analysis. Early treatment initiation, improved nutrition and anaemia, and regular monitoring can all improve RR/MDR-TB patients' outcomes and prognoses.

Clinicodemographic profile and outcome of tuberculosis treatment in TB-HIV co-infected patients receiving daily ATT under a single window TB/HIV services delivery initiative.

The risk of death in HIV-TB coinfected individuals is far greater than in HIV-only patients. It is critical to provide timely and appropriate therapy in HIV-TB coinfected patients in order to reduce morbidity and mortality. The purpose of this study was to evaluate the clinical presentation and outcome of TB treatment in HIV-TB co-infected patients receiving daily anti-tubercular therapy (ATT) and concurrent antiretroviral therapy (ART) at a tertiary respiratory care centre in New Delhi, India. The research was cross-sectional, observational, and hospital-based A. From September 2018 to August 2019, a total of 53 patients with HIV-TB coinfection were enrolled at the Institute's ART centre. Patients were evaluated with a structured proforma. Data were evaluated using SPSS version 23.0 and p-value of less than 0.05 was considered statistically significant. Among the patients enrolled, the mean age was 35.98 years. Among the patients enrolled, 56.6% patients had EPTB, 32% had PTB and 11.3% had both PTB and EPTB. The majority of the enrolled patients (n=46, 86.7%) had favourable TB treatment outcomes, while 13.3% (n=7) had unfavourable outcome [including death (n=5) and loss to follow up (n=2)]. During the study and follow-up period, no patients transferred out or relapsed. In univariate analysis, low SES, bedridden functional status, low BMI, anaemia, hypoalbuminemia, and a low CD-4 cell count (<100 cells/mm3 were significantly associated with an unfavourable outcome. Bedridden functional status (p=0.002), anaemia (p=0.040), and low BMI (p<0.001) were independently associated with a poor outcome. Adequate disease knowledge and health education can be very beneficial in reducing morbidity and mortality. Early ART in combination with ATT can reduce mortality in TB-HIV co-infected patients.

To investigate the knowledge, attitude and practices regarding tuberculosis case notification among public and private doctors practicing of modern medicine in South Delhi.

In India, tuberculosis (TB) notification has been required since 2012. Notwithstanding, notification rates remain low. Non-reporting of tuberculosis cases not only results in an underestimation of cases, but also impedes the country's TB control strategy. Our research aims to assess practitioners' awareness, perception, and practice of tuberculosis case notification, as these factors can help reduce the TB burden. A cross-sectional study of 142 physicians was conducted between August 2018 and December 2019. Doctors were interviewed and given evaluation forms. Seventy-seven percent of the 142 physicians polled worked in medicine-related specialties, while 33% worked in surgery. Public sector physicians (64.7%) knew more about the Nikshay App than private practitioners (40.8%). The vast majority of public-sector doctors were only notified through their hospital's National Tuberculosis Elimination Programme (NTEP) center. However, the majority of private practitioners (47.8%) notified cases directly through the hospital, the local District Tuberculosis Officer (DTO) or NTEP medical officer (24 percent), or the Nikshay portal (28%), whereas the majority of public sector doctors notified only through the hospital NTEP center (85.9%). The primary reasons for non-notification are the high patient load on doctors, a lack of understanding about Nikshay App and its functionality, technological difficulties in using the Nikshay App, and the stigma associated with tuberculosis. The Nikshay App must be popularized as a notification mechanism through the NTEP program. To increase notification rates, practitioners must overcome the challenges they face. In terms of notification, more seminars and training, particularly hands-on training, should be held on a regular basis.

Thoracic follicular dendritic cell sarcoma - an outlandish presentation of a rare tumour with review of literature.

Follicular dendritic cell sarcoma is a rare low grade malignant neoplasm that arises from follicular dendritic cells in lymphoid tissue germinal centres and accounts for 0.4% of all soft tissue sarcomas. It is extremely rare to have pulmonary follicular dendritic cell sarcoma with endobronchial extension and as an anterior mediastinal mass with mediastinal lymph node involvement. We present the case of a 34-year-old male non-smoker who had been experiencing chest pain for three months. A lobulated left peri-hilar mass with endobronchial spread into the left main bronchus and mediastinal lymphadenopathy was identified on a chest CT. The bronchoscope-guided cryobiopsy of the endobronchial mass was inconclusive. After a thorough multidisciplinary discussion, the patient underwent left sided pneumonectomy, mediastinal mass resection, and systematic lymph node dissection. Histologic examination using immunohistochemistry revealed follicular dendritic cell sarcoma.

A Scalable Solution Route to Porous Networks of Nanostructured Black Tungsten.

This paper studied the feasibility of a new solution-processed method to manufacture black tungsten nanostructures by laser conversion of tungsten hexacarbonyl precursor on the Inconel 625 substrate under argon atmosphere at ambient pressure. The results show that sublimation of the precursor can be prevented if the decomposition temperature (>170 °C) is achieved using the laser heating method. Three different laser powers from 60-400 W were used to investigate the role of laser parameters on the conversion. It was found that lower laser power of 60 W resulted in a mixture of unconverted precursor and converted tungsten. Higher laser powers >200 W resulted in α-W (BCC) in one step without further heat treatment. Different oxygen concentrations from 0.5 ppm to 21 vol% were used in the laser canister to investigate the effect of oxygen concentration on the conversion. It was found that the hard vacuum (>10-4 torr) or hydrogen is not necessary to obtain α-W (BCC). The solar absorptance varied from 63-97%, depending on the amount of precursor deposited on the substrate and oxygen content in the laser canister. This solution-based laser conversion of tungsten precursor is a scalable method to manufacture tungsten coatings for high-temperature applications.

Suppress, and not just flatten:Strategies for Rapid Suppression of COVID19 transmission in Small World Communities

Many countries have introduced Lockdowns to contain the COVID19 epidemic. Lockdowns, though an effective policy for containment, imposes a heavy cost on the economy as it enforces extreme social distancing measures on the whole population. The objective of this note is to study alternatives to Lockdown which are either more targeted or allows partial opening of the economy. Cities are often spatially organized into wards. We introduce Multi-lattice small world (MLSW) network as a model of a city where each ward is represented by a 2D lattice and each vertex in the latex represents an agent endowed with SEIR dynamics. Through simulation studies on MLSW we examine a variety of candidate suppression policies and find that restricting Lockdowns to infected wards can indeed out-perform global Lockdowns in both reducing the attack rate and also shortening the duration of the epidemic. Even policies such as partial opening of the economy, such as Two Day Work Week, can be competitive if augmented with extensive Contact Tracing.

Rigid nasal endoscopy in the diagnosis and treatment of epistaxis.

BACKGROUND AND OBJECTIVES: Epistaxis is one of the common symptoms encountered in the Otorhinolaryngology department. Many times the cause for epistaxis is not found on anterior and posterior rhinoscopy. The present study was undertaken to assess the role of rigid nasal endoscope in the diagnosis and treatment of epistaxis, where normal anterior and posterior rhinoscopy did not reveal any specific finding. METHODS: Fifty patients with epistaxis were studied using rigid nasal endoscope under local anaesthesia. Patients who were above 15 years with nasal bleeding and who were willing for rigid nasal endoscopy were included in the study. Patients less than 15 years were not included in the study because nasal endoscopy was difficult in them under local anaesthesia. Only those patients in whom, the cause for epistaxis could not be made out on anterior and posterior rhinoscopy were chosen for the study, this was done in order to remove the bias for nasal endoscopy. RESULTS: The use of the nasal endoscope allowed diagnosis of bleeding points and treating them directly. Epistaxis was more in male patients especially in the 3rd and after the 5th decade. On endoscopic examination,the bleeding points were identified as coming from the crevices of the lateral nasal wall, posterior spur on the septum, posterior deviation of the septum with ulcer, congested polyps, enlarged and congested adenoids, scabs or crusts in the crevices of the lateral nasal wall and angiofibroma. Endoscope also helps in the treatment of epistaxis, which includes endoscopic selective nasal packing using gelfoam, endoscopic cautery or diathermy and endoscopic polypectomy. Other patients with adenoids, scabs and crusts and angiofibroma were managed on their merits. INTERPRETATION AND CONCLUSION: Nasal endoscopy helps not only in the localisation of the bleeding point but also in the treatment of those bleeding areas that are situated in the posterior and lateral part of the nose.