The electronic journal of human sexuality最新文献

{"title":"Toward a Better Understanding of Phase Transformations in Additive Manufacturing of Alloy 718","authors":"C. Kumara, A. R. Balachandramurthi, Sneha Goel, Fabian Hanning, J. Moverare","doi":"10.2139/ssrn.3628004","DOIUrl":"https://doi.org/10.2139/ssrn.3628004","url":null,"abstract":"Abstract This paper presents a discussion on the phase-transformation aspects of additively manufactured Alloy 718 during the additive manufacturing (AM) process and subsequent commonly used post-heat treatments. To this end, fundamental theoretical principles, thermodynamic and kinetics modeling, and existing literature data are employed. Two different AM processes, namely, laser-directed energy deposition and electron-beam powder-bed fusion are considered. The general aspects of phase formation during solidification and solid state in Alloy 718 are first examined, followed by a detailed discussion on phase transformations during the two processes and subsequent standard post heat-treatments. The effect of cooling rates, thermal gradients, and thermal cycling on the phase transformation in Alloy 718 during the AM processes are considered. Special attention is given to illustrate how the segregated composition during the solidification could affect the phase transformations in the Alloy 718. The information provided in this study will contribute to a better understanding of the overall process–structure–property relationship in the AM of Alloy 718 718.","PeriodicalId":89488,"journal":{"name":"The electronic journal of human sexuality","volume":"6 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-06-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73886028","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Near-Threshold Fatigue Crack Growth Rates of Laser Powder Bed Fusion Produced Ti-6Al-4V","authors":"T. Becker, Nur Mohamed Dhansay, G. T. Haar, K. Vanmeensel","doi":"10.2139/ssrn.3622627","DOIUrl":"https://doi.org/10.2139/ssrn.3622627","url":null,"abstract":"Abstract When Ti-6Al-4V is processed by laser powder bed fusion (LPBF), a material with a martensitic microstructure is obtained. Moreover, the presence of internal stresses, an outer surface with relatively high surface roughness and the presence of remnant porosity all influence the fatigue life of high cyclically loaded components. The majority of investigations on LPBF produced Ti-6Al-4V have focussed on a fatigue life method providing valuable, albeit limited, insight into fatigue failure mechanisms. Near-threshold fatigue crack growth rates are vital for describing fatigue crack initiation mechanisms and how these are influenced by residual stress, a martensitic microstructure and build orientation. This study investigates near-threshold fatigue crack growth rates of LPBF produced Ti-6Al-4V. The study makes use of full-size compact tension specimens for fatigue crack growth rate investigations, the contour method for residual stress measurement, and scanning electron microscopy with electron backscatter diffraction to consider both morphological and crystallographic texture. Results show anisotropic near-threshold fatigue crack growth rates that are dependant on residual stress levels and load-ratios. Fracture is predominantly governed by transgranular quasi-cleavage mechanisms, and the fracture path is directed by the columnar prior beta-grain structure resulting in orientation-dependant crack closure effects. Residual stresses result in crack opening that causes a shift of near-threshold fatigue crack growth rates. An intrinsic ΔKth of ~1.6 ± 0.2 MPa√m and critical Kmax of ~ 3 MPa√m is measured that is independent of the stress state but dependant on orientation. It is shown that this anisotropy is linked to morphological texture and to a lesser extent the crystallographic texture of LBPF produced Ti-6Al-4V.","PeriodicalId":89488,"journal":{"name":"The electronic journal of human sexuality","volume":"12 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-06-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78292879","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Marketing Management: Past, Present and Future","authors":"S. Meharanjunisa","doi":"10.2139/ssrn.3630924","DOIUrl":"https://doi.org/10.2139/ssrn.3630924","url":null,"abstract":"The concept of market management is a degree with which organization is structured to deliver the product in market. It plays very important role to balance the profit and loss ratio. The marketing techniques are equipped with different components which are essential to make it more successful management system. There are large number of studies confining the process of marketing, based on which the present study is designed to provide the important role of marketing management strategies.","PeriodicalId":89488,"journal":{"name":"The electronic journal of human sexuality","volume":"29 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-06-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74528672","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Designing for Visibility: The Case of Mobile Apps","authors":"A. Karanam, Ashish Agarwal, A. Barua","doi":"10.2139/ssrn.3635854","DOIUrl":"https://doi.org/10.2139/ssrn.3635854","url":null,"abstract":"With a large number of mobile apps in both iOS and Android platforms, app developers face a significant challenge in generating market demand. Apps can incorporate social features to share information on social media platforms and gain visibility. Classifying features of an app as intrinsic or social, we focus on the impact of these features in the head, body, and tail of the demand distribution. We posit that owing to the lack of visibility, apps in the tail may benefit more from social features than those in the head or body sections. Using a panel of version release notes from the iOS platform, we develop a new hierarchical deep learning model to extract intrinsic and social features. Our results suggest that social features increase the relative demand only for tail apps. For apps in the head of the distribution, social and intrinsic features together help increase the relative demand. However, the combined effect of social and intrinsic is negative in the tail for low-quality apps. The results underscore the heterogeneity in the effect of social features on app demand, an important consideration in the design phase. We demonstrate that there is no one-size-fits-all approach that works in all parts of the demand distribution. Our study provides managerial guidance to app developers in making their products visible through design choices and presents a novel deep learning approach for product feature identification.","PeriodicalId":89488,"journal":{"name":"The electronic journal of human sexuality","volume":"3 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-06-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86133506","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Switchable Micro-Strip Pin Diode Patch Antenna With Slot Changing Method for Wide Band Frequency Applications","authors":"Amit Gupta","doi":"10.2139/ssrn.3624902","DOIUrl":"https://doi.org/10.2139/ssrn.3624902","url":null,"abstract":"A novel microstrip rectangular patch antenna adopting a quarter-wave transformer feed with switchable resonant frequency capability. Switchable (Reconfigurable) antennas symbolize innovation in antenna design that transforms the classical fixed-form, fixed-function antennas to modifiable (Changeable) structures that can be adapted to the provisions of a time-varying system. Advances in microwave semiconductor processing technologies have thereby enabled the use of compact, ultrahigh quality RF and microwave switches in innovative aspects of antenna design. The creation of dynamic radiating structures that can be reconfigured during the operation is new tools that were made possible to design through the High quality, miniature RF switches (e.g. PIN Diode) provided to the antenna designer. \u0000 \u0000The proposed antenna design is obtained by using a C shaped slot cut on the reference patch that is linked by a thin metallic strip incorporating one PIN diodes to obtain the dual-frequency transection. By dominant the PIN diode prejudice voltage potential (-9 Volts for reverse bias & +9 Volts for forwarding bias), the aerial possibly interchanged separating two dissimilar frequencies. It is indicated through the Simulation results that without any additional matching elements, the proposed. \u0000 \u0000Antenna demonstrates an extremely excellent input coincide designed two resonant frequencies of 3.66GHz and 6.5 GHz. These two resonant frequencies depend on the operation of the diode.","PeriodicalId":89488,"journal":{"name":"The electronic journal of human sexuality","volume":"47 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-06-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88412890","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Design of Fuzzy Adaptive Pi Controller for Inherently Unstable System","authors":"P. Swarnkar, H. Goud","doi":"10.2139/ssrn.3623747","DOIUrl":"https://doi.org/10.2139/ssrn.3623747","url":null,"abstract":"Desired performance of any process depends on the control action taken by the controller. Choice of control structure and the design approach is mainly concerned with a priori knowledge of the process dynamics governed by any system, its limitations to achieve desire response and calculation of system state at different instant of time. Many practitioners and researchers in the field of control agree that controller design can be quite laborious in cases where the plant is unstable. The controller synthesis becomes a challenge for such systems because there are certain design and performance limitations that narrow the range of feasible solutions. These constraints reflect imperfect controller design which may work satisfactorily in one situation and may fail completely in other. Adaptive control where the controller parameters adjust them self as per the system requirements, is a candidate solution for such problem. This paper mainly focuses on design of model reference adaptive control based PI (Proportional-Integral) controller for unstable system. Adaptation mechanism is developed by fuzzy logic which makes the controller more versatile and reduces the design requirements. Results are compared with the conventional controller tuned with Ziegler-Nichols method. Detailed simulation Study and experimental validation shows the effectiveness of proposed Fuzzy Adaptive PI controller to control the unstable system for obtaining the desired performance out of it.","PeriodicalId":89488,"journal":{"name":"The electronic journal of human sexuality","volume":"3 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-06-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85687854","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Microstructure and Fatigue Crack Growth Behavior of Inconel 718 Superalloy Fabricated Via Laser Directed Energy Deposition Additive Manufacturing","authors":"Xiaobin Yu, Xin Lin, Fencheng Liu, Yunlong Hu, Shuya Zhang, Yufeng Zhan, Haiou Yang, Weidong Huang","doi":"10.2139/ssrn.3614841","DOIUrl":"https://doi.org/10.2139/ssrn.3614841","url":null,"abstract":"This work investigated the microstructure and its influence on room-temperature fatigue crack growth (FCG) behavior of Inconel 718 (IN718) alloy fabricated with laser-based directed energy deposition (L-DED). As-deposited specimens were heat-treated by direct aging (DA), solution treatment + aging (SA) and homogenization + solution treatment + aging (HSA) respectively to investigate the effect of post-heat-treatment. On comparison with as-deposited microstructure, which mainly consists of γ dendrite and Laves phases in the interdendritic regions. Dendritic segregation still appears after DA heat-treatment, which is certified to alter the precipitation kinetics of γ′′/γ′ precipitations of IN718 and induce the formation of more abundant γ′′/γ′ precipitations in interdendritic Nb-rich regions versus the dendritic trunk regions. After SA heat-treatment, Nb released from the dissolution of Laves phase is prone to diffuse to the ambient interdendritic regions, which facilitates the formation of δ-phase and the homogeneous precipitations of γ′′/γ′ phases in dendritic trunk region. After HSA heat-treatment, the Laves phases are eliminated completely, the dispersive γ′′/γ′ precipitates (~30 nm) are distributed within the bimodal recrystallized grains. The results of FCG testing reveal that as-deposited specimen possesses the lowest threshold for fatigue-crack initiation (ΔKth) and the highest FCG rate (FCGR). The ΔKth and FCGR of DA specimen do not have the notable improvement versus those of as-deposited specimen, due to its inferior strength-plasticity mainly caused by heterogeneous γ′′/γ′ phases and Laves particles. The fatigue-crack propagates easily along the precipitate-free zone around short-acicular δ-phase, which causes the crack branching and deflection, enhances the resistance to FCG of SA specimen to some extent. The ΔKth of HSA specimen increases by ~2.6 times compared with as-deposited specimen and reaches 10.8 MPa∙m1/2, due to its decent strength-plasticity (~1130 MPa, ~26.5%). Especially, the ΔKth and FCGR of HSA specimen are comparable to that of the wrought IN718. The FCG behaviors of all specimens predominantly occur in the transgranular ductile fracture mode. Overall, the present study demonstrates that a judicious post-heat-treatment can enhance the damage tolerance of L-DED IN718 by increasing ΔKth and decreasing FCGR.","PeriodicalId":89488,"journal":{"name":"The electronic journal of human sexuality","volume":"16 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-06-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81173019","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Diagnosis of Glaucoma using ARM Processor on Retinal Image","authors":"Karnika K. Baraiya, D. A. Suthar","doi":"10.2139/ssrn.3668857","DOIUrl":"https://doi.org/10.2139/ssrn.3668857","url":null,"abstract":"The abstract is to be in fully-justified italicized text as it is here, below the author information. Use the word Glaucoma is the disease which effect on the human eye which may cause blindness if not treated properly. Glaucoma occurs due to increased pressure called Intra Ocular Pressure (IOP). The glaucoma detection will be carried out using Image Processing Methods like NFL (Nerve Fibre Layer) defects detection and texture analysis, Neuro Retinal Optic Cup Detection and Image Segmentation. For the development of the system, ARM based processor and high-resolution night vision camera is used. Using Camera module will capture fundus images, image processing algorithm will process this image further with edge detection and apply various techniques for detection and correction of medical images. This research work can detect Glaucoma at preliminary stages. It is helpful for medical practitioner and researchers as well as patients. The proposed method is automated, portable, cheapest and more accurate and efficient.","PeriodicalId":89488,"journal":{"name":"The electronic journal of human sexuality","volume":"221 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-06-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76776634","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Viability of Slow-Roll Inflation in Light of the Non-Zero K_min Measured in the Cmb Power Spectrum","authors":"F. Melia","doi":"10.2139/ssrn.3618300","DOIUrl":"https://doi.org/10.2139/ssrn.3618300","url":null,"abstract":"Slow-roll inflation may simultaneously solve the horizon problem and generate a near scale-free fluctuation spectrum P(k). These two processes are intimately connected via the initiation and duration of the inflationary phase. But a recent study based on the latest Planck release suggests that P(k) has a hard cutoff, k_min > 0, inconsistent with this conventional picture. Here we demonstrate quantitatively that most---perhaps all---slow-roll inflationary models fail to accommodate this minimum cutoff. We show that the small parameter `epsilon' must be > 0.9 throughout the inflationary period to comply with the data, seriously violating the slow-roll approximation. Models with such an epsilon predict extremely red spectral indices, at odds with the measured value. We also consider extensions to the basic picture (suggested by several earlier workers) by adding a kinetic-dominated or radiation-dominated phase preceding the slow-roll expansion. Our approach differs from previously published treatments principally because we require these modifications to---not only fit the measured fluctuation spectrum, but to simultaneously also---fix the horizon problem. We show, however, that even such measures preclude a joint resolution of the horizon problem and the missing correlations at large angles.","PeriodicalId":89488,"journal":{"name":"The electronic journal of human sexuality","volume":"16 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-06-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83004490","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"The Gatekeeper’s Dilemma: 'When Should I Transfer This Customer?'","authors":"B. Hathaway, E. Kagan, M. Dada","doi":"10.2139/ssrn.3617356","DOIUrl":"https://doi.org/10.2139/ssrn.3617356","url":null,"abstract":"In many service encounters front-line workers (often referred to as gatekeepers) have the discretion to attempt to resolve a customer request, or to transfer the customer to an expert service provider within the organization. We study the gatekeeper’s transfer decision using an integrated approach that consists of a field study, an analytical model and a behavioral experiment. Drawing on a proprietary dataset of 9.8 million interactions between the customers and call center agents of a US-based Bank, we formulate and solve a dynamic finite-horizon model that characterizes the gatekeeper’s response to different incentive schemes and to different queueing dynamics. We then conduct experiments to examine how human behavior deviates from the normative implications of the model. We find that: 1) Simple bonus-based incentives lead to transfer behaviors that are broadly consistent with the model predictions; 2) Adding transfer penalties to a bonus- based system uniformly reduces transfer rates, even controlling for incentive differences; 3) Gatekeepers are able to incorporate the state of the queue into their decisions. Taken together, these results help provide behavioral underpinnings for future models of discretionary server behavior in queueing systems.","PeriodicalId":89488,"journal":{"name":"The electronic journal of human sexuality","volume":"34 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-06-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78769542","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}