Generation of Circularly-Polarised High-Harmonics with Identical Helicity in Two-Dimensional Materials

Generation of circularly-polarized high-harmonics with the same helicity to all orders is indispensable for chiral-sensitive spectroscopy with attosecond temporal resolution. Solid-state samples have added a valuable asset in controlling the polarization of emitted harmonics. However, maintaining the identical helicity of the emitted harmonics to all orders is a daunting task. In this work, we demonstrate a robust recipe for efficient generation of circularly-polarized harmonics with the same helicity. For this purpose, a nontrivial tailored driving field, consisting of two co-rotating laser pulses with frequencies $\omega$ and $2\omega$, is utilized to generate harmonics from graphene. The Lissajous figure of the total driving pulse exhibits an absence of the rotational symmetry, which imposes no constraint on the helicity of the emitted harmonics. Our approach to generating circularly-polarized harmonics with the same helicity is robust against various perturbations in the setup, such as variation in the subcycle phase difference or the intensity ratio of the $\omega$ and $2\omega$ pulses, as rotational symmetry of the total driving pulse remains absent. Our approach is expected to be equally applicable to other two-dimensional materials, among others, transition-metal dichalcogenides and hexagonal boron nitride as our approach is based on absence of the rotational symmetry of the driving pulse. Our work paves the way for establishing compact solid-state chiral-XUV sources, opening a new realm for chiral light-matter interaction on its intrinsic timescale.Comment: 16 pages, 4 figur

Business Policy Experiments using Fractional Factorial Designs: Consumer Retention on DoorDash

This paper investigates an approach to both speed up business decision-making and lower the cost of learning through experimentation by factorizing business policies and employing fractional factorial experimental designs for their evaluation. We illustrate how this method integrates with advances in the estimation of heterogeneous treatment effects, elaborating on its advantages and foundational assumptions. We empirically demonstrate the implementation and benefits of our approach and assess its validity in evaluating consumer promotion policies at DoorDash, which is one of the largest delivery platforms in the US. Our approach discovers a policy with 5% incremental profit at 67% lower implementation cost.Comment: 14 page

HELLP syndrome and its implications on maternal and perinatal outcome

Background: The HELLP syndrome is characterized by hemolysis (H), elevated liver enzymes (EL) and low platelet count (LP). This syndrome in general complicates 0.2-0.6% of all pregnancies but its incidence increases to 4-12% in severe preeclampsia. In about 15% cases, HELLP syndrome presents without definitive criteria for preeclampsia (atypical preeclampsia). This present study will throw light on incidence, clinical and biochemical profile of patients with HELLP syndrome and maternal and perinatal outcome.Methods: A prospective study was conducted in the department of Obstetrics and Gynecology, Bebe Nanki Mother and Child Care Centre, Amritsar, India from January 2016 to August 2017 after approval from institutional ethics committee.Results: In the present study, total 2949 antenatal admissions were there during the course of study. Out of these patients, 352 patients had preeclampsia-eclampsia (11.93%). Out of these 352 patients, 71 complicated with HELLP syndrome (20.17%). 17.9% had partial HELLP and 2.3% had complete HELLP syndrome. 30.16% had only EL, 31.75% had only LP, 87.3% had elevated LDH (depicted hemolysis). 4.76% had both EL and LP, 30.16% had both EL and elevated LDH, 20.63% had both LP and elevated LDH levels. Majority of the patients presented after 36 weeks of gestation. Only 5 patients had HELLP syndrome in the postpartum period. Among partial HELLP patients, 59.02% delivered vaginally and 40.98% delivered by LSCS and among complete HELLP patients 28.6% delivered vaginally and 71.4% delivered by LSCS. Perinatal mortality rate was 43.7%. Severe maternal complications such as PPH, DIC, abruptio placentae, pulmonary edema and renal failure were seen high among HELLP patients.Conclusions: As the incidence is very high, one must be aware of its clinical and laboratory findings so that early diagnosis and treatment can be initiated. Close surveillance of the mother should be continued even after delivery

A new convolution operator for the linear canonical transform with applications

The linear canonical transform plays an important role in engineering and many applied fields, as it is the case of optics and signal processing. In this paper, a new convolution for the linear canonical transform is proposed and a corresponding product theorem is deduced. It is also proved a generalized Young's inequality for the introduced convolution operator. Moreover, necessary and sufficient conditions are obtained for the solvability of a class of convolution type integral equations associated with the linear canonical transform. Finally, the obtained results are implemented in multiplicative filters design, through the product in both the linear canonical transform domain and the time domain, where specific computations and comparisons are exposed.Fundação para a Ciência e Tecnologiapublishe

Unruptured ovarian ectopic gestation: a rare clinical scenario

Ovarian pregnancy is a rare event, with the incidence ranging from 1 in 2000 to 1 in 60 000 deliveries and accounts for 3% of all ectopic pregnancies. The first case of ovarian pregnancy was published by Saint Monnisey. Authors report a case of a 23-year-old patient with severe lower abdominal pain following five weeks of amenorrhea diagnosed as tubal ectopic pregnancy on ultrasonography. The patient was taken up for emergency laparoscopy and unexpected finding of ovarian pregnancy was established. Early diagnosis and prompt treatment go a long way to prevent serious outcomes and to ensure favourable future reproductive potential

Physico-chemical and enzymatic changes in peach (Prunus persica (L.) Batsch) fruit in response to sodium salts during low temperature storage

‘Shan-i-Punjab’ is a leading cultivar of peach (Prunus persica (L.) Batsch) in Punjab. After harvesting peach fruits cannot be stored for a longer period under ambient conditions. To prolong the post-harvest life of fruits, an experiment was conducted during the year 2014. Physiological mature fruits of peach cv. Shan-i-Punjab were harvested and subjected to various post-harvest dip treatments viz. sodium bicarbonate (@ 0.5 and 1%), sodium benzoate (@ 0.5 and 1%) for 5 mins. Treated and untreated (control) fruits were packed in Corrugated fibre board CFB boxes and kept under low temperature storage conditions (0-10 C and 90-95% RH) for 6 weeks. Stored fruits were analyzed for various physico-chemical characteristics after 2, 4, 5 and 6 weeks of storage. Fruits treated with 0.5% sodium bicarbonate showed better results in terms low PLW (5.05%), high palatability rating (7.66), TSS (11.26%), acidity (0.70%) and PME activity (1.28 ml of 0.02N NaOH used) upto 4 weeks of storage as compared to control. It can be concluded that peach fruits of the cultivar Shan-i-Punjab treated with sodium bicarbonate @ 0.5% can be safely stored upto 4 weeks with acceptable quality under low temperature conditions

Parallel Experimentation in a Competitive Advertising Marketplace

When multiple firms are simultaneously running experiments on a platform, the treatment effects for one firm may depend on the experimentation policies of others. This paper presents a set of causal estimands that are relevant to such an environment. We also present an experimental design that is suitable for facilitating experimentation across multiple competitors in such an environment. Together, these can be used by a platform to run experiments "as a service," on behalf of its participating firms. We show that the causal estimands we develop are identified nonparametrically by the variation induced by the design, and present two scalable estimators that help measure them in typical high-dimensional situations. We implement the design on the advertising platform of JD.com, an eCommerce company, which is also a publisher of digital ads in China. We discuss how the design is engineered within the platform's auction-driven ad-allocation system, which is typical of modern, digital advertising marketplaces. Finally, we present results from a parallel experiment involving 16 advertisers and millions of JD.com users. These results showcase the importance of accommodating a role for interactions across experimenters and demonstrates the viability of the framework

A PHARMACOLOGICAL COMPREHENSIVE REVIEW ON ‘RASSBHARY' PHYSALIS ANGULATA (L.)

The present review article reveals the importance of species Physalis angulata (L.) of the genus Physalis (L.) distributed worldwide including India. Physalis species are perennial, erect and variously having toothed or lobed leaves. Physalis angulata (L.) belongs to the family Solanaceae, includes about 120 species with different and specific herbal characters. On the basis of these herbal characters, the plant is traditionally used as medicine to cure various disorders like asthma, kidney, bladder, jaundice, gout, inflammations, cancer, digestive problems and diabetes etc. P. angulata is a source of the variety of phytoconstituents like phytosteroles, withangulatin A, a variety of physalins and flavonol glycoside etc. The plant extracts from the different parts having different pharmacological activities such as anti-cancerous, immunomodulatory, anti-diabetic, diuretic and anti-bacterial. In this article cytomorphological, phytochemical, biological activities and ethnobotanical inputs have been extensively recorded for P. angulata (L.)