Enterprise social networking and service innovation: a governance perspective

To innovate, firms need to share knowledge across their different functions. An increasing number of organizations are using enterprise social networking (ESN) for knowledge sharing internally because it is more effective than traditional knowledge management systems. However, ESN use can also have some negative outcomes; for example, it may distract employees from their work and overload them with information, while also providing a channel for leaking confidential information. This study aims to understand how knowledge sharing through ESN affects the level of innovation in firms from the service industry and how this relationship is affected by the governance of ESN. Using data from a survey of 104 participants from global financial firms, we find that the level of innovation in firms is enhanced by the use of ESN for knowledge sharing, and that governance positively moderates this relationship. The paper concludes with some theoretical and practical contributions

A Simplified Approach to Optimally Controlled Quantum Dynamics

A new formalism for the optimal control of quantum mechanical physical observables is presented. This approach is based on an analogous classical control technique reported previously[J. Botina, H. Rabitz and N. Rahman, J. chem. Phys. Vol. 102, pag. 226 (1995)]. Quantum Lagrange multiplier functions are used to preserve a chosen subset of the observable dynamics of interest. As a result, a corresponding small set of Lagrange multipliers needs to be calculated and they are only a function of time. This is a considerable simplification over traditional quantum optimal control theory[S. shi and H. Rabitz, comp. Phys. Comm. Vol. 63, pag. 71 (1991)]. The success of the new approach is based on taking advantage of the multiplicity of solutions to virtually any problem of quantum control to meet a physical objective. A family of such simplified formulations is introduced and numerically tested. Results are presented for these algorithms and compared with previous reported work on a model problem for selective unimolecular reaction induced by an external optical electric field.Comment: Revtex, 29 pages (incl. figures

Electron Thermalization and Relaxation in Laser-Heated Nickel by Few-Femtosecond Core-Level Transient Absorption Spectroscopy

Direct measurements of photoexcited carrier dynamics in nickel are made using few-femtosecond extreme ultraviolet (XUV) transient absorption spectroscopy at the nickel M$_{2,3}$ edge. It is observed that the core-level absorption lineshape of photoexcited nickel can be described by a Gaussian broadening ($\sigma$) and a red shift ($\omega_{s}$) of the ground state absorption spectrum. Theory predicts, and the experimental results verify that after initial rapid carrier thermalization, the electron temperature increase ($\Delta T$) is linearly proportional to the Gaussian broadening factor $\sigma$, providing quantitative real-time tracking of the relaxation of the electron temperature. Measurements reveal an electron cooling time for 50 nm thick polycrystalline nickel films of 640$\pm$80 fs. With hot thermalized carriers, the spectral red shift exhibits a power-law relationship with the change in electron temperature of $\omega_{s}\propto\Delta T^{1.5}$. Rapid electron thermalization via carrier-carrier scattering accompanies and follows the nominal 4 fs photoexcitation pulse until the carriers reach a quasi-thermal equilibrium. Entwined with a <6 fs instrument response function, carrier thermalization times ranging from 34 fs to 13 fs are estimated from experimental data acquired at different pump fluences and it is observed that the electron thermalization time decreases with increasing pump fluence. The study provides an initial example of measuring electron temperature and thermalization in metals in real time with XUV light, and it lays a foundation for further investigation of photoinduced phase transitions and carrier transport in metals with core-level absorption spectroscopy.Comment: 20 pages, 8 figure

Perinatal Intimate Partner Violence and Maternal-Infant Bonding in Women With Anxiety Symptoms in Pakistan: The Moderating Role of Breastfeeding.

Intimate partner violence (IPV) during the perinatal period can negatively affect both a woman's health and the bonding with her infant. Research on IPV among pregnant women experiencing psychological distress in South Asia is limited. We examined associations between perinatal exposure to IPV and postnatal maternal-infant bonding in Pakistani women with symptoms of anxiety and assessed if breastfeeding practices moderated these associations. Postnatal data were collected from 720 Pakistani women who reported at least mild levels of anxiety symptoms in pregnancy. We performed Poisson regression with robust variance analyses to examine the associations between IPV during pregnancy or within 6 weeks after delivery (i.e., the perinatal period) and maternal-infant bonding. Interaction terms between IPV and breastfeeding practices were included in the analytic models to examine the moderating effects. About 27% of women were exposed to at least one type of perinatal IPV. Women who were exposed to IPV were more likely to have moderate to severe postpartum anxiety (n = 57, 28.9% of IPV-exposed women), compared to those without IPV (n = 65, 12.4% of unexposed women; p value < .001). Compared to women not reporting IPV, women exposed to any IPV showed a 38% increase in Postpartum Bonding Questionnaire scores, suggesting higher likelihood of impaired bonding (risk ratio [RR] = 1.38, 95% confidence interval [CI] [1.21, 1.56]). Among women who initiated breastfeeding later than 1 hr post-delivery, IPV was associated with impaired bonding (RR = 1.09, 95% CI [1.06, 1.20]), whereas no association was present for women who initiated breastfeeding within 1 hr (RR = 1.03, 95% CI [0.98, 1.08]). In addition to the efforts to reduce IPV, encouraging IPV-exposed women to adhere to the breastfeeding guidelines (e.g., early breastfeeding) may enhance maternal-infant bonding

Cultural adaptation and psychometric validation of the Pregnancy Experience Scale-Brief version (PES-Brief) in Pakistani women with antenatal anxiety symptoms.

BackgroundPregnancy experiences influence fetal and birth outcomes. There is scarcity of locally validated tools to assess pregnancy experiences. We aimed to validate the Pregnancy Experience Scale-Brief (PES-Brief) in pregnant Pakistani women with anxiety symptoms.MethodsA two-step process was used including 1) adaptation via translation/back-translation followed by cognitive interviewing with 10 participants and 2) factor analysis and validation with 605 women in Rawalpindi Pakistan who had mild-moderate symptoms of anxiety, attended the antenatal clinic, and were ≤22 weeks of gestation and ≥18 years old. We calculated internal consistency and reliability and conducted exploratory and confirmatory factor analyses.ResultsCultural adaptation led to inclusion of one item of the hassles subscale and exclusion of one item in the uplifts subscale, resulting in 9 uplifts and 11 hassles. Exploratory factor analysis supported a two-factor structure, with the adapted items exhibiting loading values of ≥0.24 for their respective factors. Internal consistency was demonstrated for uplifts (Cronbach's alpha = 0.89) and hassles (Cronbach's alpha = 0.85) subscales. Uplift intensity was moderately correlated with the Hospital Anxiety and Depression Scale anxiety subscale (r = 0.54, 95% CI:0.30-0.77).ConclusionThe Urdu PES-Brief is a reliable and valid tool for use in Pakistani pregnant women with antenatal anxiety. Future studies on its validity are needed on women without symptoms anxiety

Multi-electron Reduction Capacity and Multiple Binding Pockets in Metal-Organic Redox Assembly at Surfaces

Metal–ligand complexation at surfaces utilizing redox‐active ligands has been demonstrated to produce uniform single‐site metals centers in regular coordination networks. Two key design considerations are the electron storage capacity of the ligand and the metal‐coordinating pockets on the ligand. In an effort to move toward greater complexity in the systems, particularly dinuclear metal centers, we designed and synthesized tetraethyltetra‐aza‐anthraquinone, TAAQ, which has superior electron storage capabilities and four ligating pockets in a diverging geometry. Cyclic voltammetry studies of the free ligand demonstrate its ability to undergo up to a four‐electron reduction. Solution‐based studies with an analogous ligand, diethyldi‐aza‐anthraquinone, demonstrate these redox capabilities in a molecular environment. Surface studies conducted on the Au(111) surface demonstrate TAAQ′s ability to complex with Fe. This complexation can be observed at different stoichiometric ratios of Fe:TAAQ as Fe 2p core level shifts in X‐ray photoelectron spectroscopy. Scanning tunneling microscopy experiments confirmed the formation of metal–organic coordination structures. The striking feature of these structures is their irregularity, which indicates the presence of multiple local binding motifs. Density functional theory calculations confirm several energetically accessible Fe:TAAQ isomers, which accounts for the non‐uniformity of the chains