Third-Party SDKs and Mobile App Performance

To create attractive mobile apps in the competitive mobile market, developers are increasingly leveraging third-party software development kits (SDKs) in app development. However, little is known about how using third-party toolkits affects app performance. Drawing on the platform literature and the boundary object theory, we conceptualize third-party SDK utilization as a boundary-spanning activity. Based on this, we theorize its impact on app performance, considering the mobile platform and app developers as contextual factors. We examine the causal influence of third-party SDKs on app performance by conducting difference-in-difference-style analyses on a longitudinal dataset of mobile apps released on the Apple App Store and Google Play. We find empirical evidence supporting our theoretical conjectures that utilizing more third-party SDKs increases active users. More interestingly, platform updates and developer platform-specific experience attenuate this positive impact. This study contributes to the platform-based innovation and governance literature and provides managerial implications in mobile domains

General synthesis of transition metal oxide ultrafine nanoparticles embedded in hierarchically porous carbon nanofibers as advanced electrodes for lithium storage

A unique general, large-scale, simple, and cost-effective strategy, i.e., foaming-assisted electrospinning, for fabricating various transition metal oxides into ultrafine nanoparticles (TMOs UNPs) that are uniformly embedded in hierarchically porous carbon nanofibers (HPCNFs) has been developed. Taking advantage of the strong repulsive forces of metal azides as the pore generator during carbonization, the formation of uniform TMOs UNPs with homogeneous distribution and HPCNFs is simultaneously implemented. The combination of uniform ultrasmall TMOs UNPs with homogeneous distribution and hierarchically porous carbon nanofibers with interconnected nanostructure can effectively avoid the aggregation, dissolution, and pulverization of TMOs, promote the rapid 3D transport of both Li ions and electrons throughout the whole electrode, and enhance the electrical conductivity and structural integrity of the electrode. As a result, when evaluated as binder-free anode materials in Li-ion batteries, they displayed extraordinary electrochemical properties with outstanding reversible capacity, excellent capacity retention, high Coulombic efficiency, good rate capability, and superior cycling performance at high rates. More importantly, the present work opens up a wide horizon for the fabrication of a wide range of ultrasmall metal/metal oxides distributed in 1D porous carbon structures, leading to advanced performance and enabling their great potential for promising large-scale applications

Graphene-wrapped reversible reaction for advanced hydrogen storage

Here, we report the fabrication of a graphene-wrapped nanostructured reactive hydride composite, i.e., 2LiBH4-MgH2, made by adopting graphene-supported MgH2 nanoparticles (NPs) as the nanoreactor and heterogeneous nucleation sites. The porous structure, uniform distribution of MgH2 NPs, and the steric confinement by flexible graphene induced a homogeneous distribution of 2LiBH4-MgH2 nanocomposite on graphene with extremely high loading capacity (80 wt%) and energy density. The well-defined structural features, including even distribution, uniform particle size, excellent thermal stability, and robust architecture endow this composite with significant improvements in its hydrogen storage performance. For instance, at a temperature as low as 350 °C, a reversible storage capacity of up to 8.9 wt% H2, without degradation after 25 complete cycles, was achieved for the 2LiBH4-MgH2 anchored on graphene. The design of this three-dimensional architecture can offer a new concept for obtaining high performance materials in the energy storage field

The effect of personalized intervention on the cognitive function of elderly inpatients

目的  对住院老年患者进行早期认知功能护理干预，评价其效果。方法  2013年1月—2015年1月入院老年科病房的120名患者，运用MMSE量表对其认知功能进行评价，观察干预效果。结果  MMSE总分及MMSE量表中时间定向、短期记忆及插画条目干预后有改善（P＜0.05），地点定向、语言记忆、注意力、物品命名、语言复述、阅读能力、语言能力及语言表达条目改善不明显（P＞0.05）。 结论  个性化的认知干预能够延缓和改善患者认知功能障碍，提高老年患者的生活质量。Objectives: To assess the effect of the early cognitive function nursing intervention on the cognitive function of elderly inpatients. Methods: A total of 120 elderly inpatients in geriatrics ward were rolled from January 2013 to January 2015, and we evaluate the cognitive function of them and gave personalized intervention to them by MMSE scale. Results: The total score of MMSE was increased (P＜0.05); The entries of time orientation, short-term memory and illustration were improved significantly after three-month intervention (P＜0.05); The entries of place orientation, language, memory, attention, article name, repeat language, reading skills, language skills and language were not improved significantly. Conclusions:  Personalized cognitive intervention could improve the cognitive dysfunction and the quality of life of elderly patients

Ammonia Oxidizing Bacteria Community Dynamics in a Pilot-Scale Wastewater Treatment Plant

Background: Chemoautotrophic ammonia oxidizing bacteria (AOB) have the metabolic ability to oxidize ammonia to nitrite aerobically. This metabolic feature has been widely used, in combination with denitrification, to remove nitrogen from wastewater in wastewater treatment plants (WWTPs). However, the relative influence of specific deterministic environmental factors to AOB community dynamics in WWTP is uncertain. The ecological principles underlying AOB community dynamics and nitrification stability and how they are related are also poorly understood. Methodology/Principal Findings: The community dynamics of ammonia oxidizing bacteria (AOB) in a pilot-scale WWTP were monitored over a one-year period by Terminal Restriction Fragment Length Polymorphism (T-RFLP). During the study period, the effluent ammonia concentrations were almost below 2 mg/L, except for the first 60 days, indicting stable nitrification. T-RFLP results showed that, during the test period with stable nitrification, the AOB community structures were not stable, and the average change rate (every 15 days) of AOB community structures was 10%68%. The correlations between T-RFLP profiles and 10 operational and environmental parameters were tested by Canonical Correlation Analysis (CCA) and Mantel test. The results indicated that the dynamics of AOB community correlated most strongly with Dissolved Oxygen (DO), effluent ammonia, effluent Biochemical Oxygen Demand (BOD) and temperature. Conclusions/Significance: This study suggests that nitrification stability is not necessarily accompanied by a stable AO

1-(2-Fluoro­benz­yl)-1-(2-fluoro­benz­yl­oxy)urea

In the title hydroxy­urea derivative, C15H14F2N2O2, the dihedral angle between the two benzene rings is 48.64 (19)°. The urea group forms dihedral angles of 48.1 (2) and 79.2 (2)° with the two benzene rings. In the crystal, inversion dimers linked by pairs of N—H⋯O hydrogen bonds occur, and further N—H⋯O links lead to chains of molecules