Achieving catalytic asymmetric functionalization of methylenecyclopropanes (MCPs) by selective C–C bond cleavage is a notable challenge due to the intricate reaction partners involved. In this work, we report that chiral aldehyde/palladium combined catalysis enables MCPs with NH2-unprotected amino acid esters. This proceeds through regiospecific branched ring-opening mechanism, resulting in optically active α,α-disubstituted α-amino esters bearing nonconjugated terminal alkene units....

The direct asymmetric α-arylation, allylation and benzylation of NH 2 unprotected amino acid esters with aryl halides, allyl benzyl chlorides are respectively achieved by chiral aldehyde catalysis.

Abstract Soil and land degradation is a common issue in Sub‐Saharan Africa leading to poor yield threatening food security, yet soil conservation technologies remain underutilized. To build on prior work that primarily emphasizes demographic differences adoption, this study contributes by identifying underlying social cultural factors influence farmers' perceptions about willingness adopt management practices rural region of Malawi. Key informant interviews were first conducted identify...

A survey of 191 randomly selected rural farm households in central Malawi was completed to provide a better estimate mobile phone access country that falls at the lower end published subscription rates. We further ask whether there remains evidence divide, across both socio-economic status and gender, such context. Detailed analyses ownership, usage practices, sources non-phone owners use for farming-relevant information highlight problems with current over-reliance on phones as primary...

This study explored the effectiveness of video as a tool to either complement or replace existing lecture-demonstration training for small farmer groups. The in decreasing knowledge gap among farmers who differ by gender was also evaluated. Quantitative and qualitative data were gathered through quasi-experiment including pretest posttest design with three experimental Results showed that could be an effective replacement traditional method. Video alone plus increasing learning. method...

Substantial interest is focused on using video to disseminate agricultural information rural farmers in the developing world. This paper explores effectiveness of this approach improve farmers' device literacy---that is, their ability use mobile phones for purposes other than making and receiving voice calls. Findings from our pilot evaluation, conducted with women western Kenya, suggest that videos combined facilitators can be useful improving women's confidence sending text messages,...

A highly efficient, atom-economical α-allylation reaction of NH

Because of the deficiencies in safety and economy single hydraulic prop passive advanced support, grouting anchor cable active support technology is proposed with Changping Coal Mine 53,081 roadway as engineering background. By using a combination theoretical analysis, laboratory tests, numerical simulation, field influence different parameters on diffusion law grout studied. Considering effect stress migration, seepage-stress coupling model established. Grouting material ratio tests are...

This paper explores how participatory video can improve the knowledge and adoption of nutrition food preparation practices among smallholder farmers in Malawi. Using a pretest-posttest quasi-experimental design, this study found that method improved participants' as much traditional demonstration method. Short-term tests were carried out 7--10 days after training. The extent short-term technique varied by training topic. For egg-coated nsima, overall rate was little over 60% across groups,...

This study explored the effectiveness of video training delivered by portable battery-operated projectors to narrow gap in agricultural knowledge between men and women rural Uganda. Through pre-post quasi-experiments, this found that both traditional lecture-demonstration approaches could significantly improve scores for women. The method combined lecture demonstration was more effective narrowing gender gap. Use alone improved women's as much but did not reduce preexisting them.

Automatic modulation identification (AMI) is a significant technique to identify the type of received signal, and it great importance in information war communication countermeasure. In this paper, we propose constellation-wavelet transform automatic identifier (C-WT AMI) order QAM signal. widely used due its high spectrum efficiency. From characteristics constellation, perform Haar wavelet signal with most appropriate scale, then calculate ratio maximum minimum value q̌M magnitude can...

Mobile value added services (MVAS) represent a growing collaboration between the private sector and development community. In this paper, we examine one such MVAS, Nokia Usaha Wanita service running on Life+ platform in Indonesia, assess its viability as an innovative means for economic empowerment of businesswomen. Data were gathered through 221 telephone interviews with nationwide random sample women who subscribed to Wanita. Subscribers reported that they derived benefit from using...

Mobile value-added services (MVAS) represent a growing collaboration between the private sector and development community. In this paper, we examine one such MVAS, Nokia Usaha Wanita service running on Life+ platform in Indonesia, assess its impact as an innovative means for economic empowerment of businesswomen. Data were gathered through 282 telephone interviews with nationwide random sample women who subscribed to Wanita. Our research found evidence that subscribers derived benefit from...

Abstract To address the issue of roadway support failure in narrow coal pillars under dual-lane layout, this study takes 4309 working face Changping Coal Mine as engineering background and employs theoretical calculations, numerical simulations, on-site monitoring to investigate instability mechanisms conditions optimize technical solutions. The results indicate that internal stress distribution within pillar is influenced by advanced stress, advances, gradually increasing pressure causes...

As a member of the neonicotinoid group, imidaclothiz has garnered increasing attention due to its possible health risks. This study investigated metabolism and distribution in mice. Seven metabolites were found, four which are known, three unknown. The metabolic reactions observed hydroxylation, nitrate ester hydrolysis, methylation, urea formation, reduction NO. Precise quantification revealed that after 2 h oral administration, rapidly dispersed into various organs tissues, peaking at 4 h,...

This study explores the effectiveness of three training methods (traditional lecture-field demonstration, lecture and field demonstration + video, video only) to narrow gap in knowledge about row bean planting between men women farmers Kamuli District,Uganda. Using a pretest-posttestquasi-experimental design, this found that method combined lecture/demonstration was significantly more effective narrowing gender gap. Use alone improved women's scores, but did not close

To improve the intelligence of urban public transportation management and tackle pain points for residents, a multi-functional intelligent bus stop system is proposed implemented in this paper. The includes two main functions: dynamic information service buses multimedia video broadcasting. improves user experience during waiting time effectively. This paper discusses background technical architecture detail. results indicate that fulfils design requirements. It offers intercommunication...