News on China's scientific and technological development.

SanWenYu

Captain
Registered Member
China has published more papers on the "most impactful" journals than anyone else in 2022.

Out of the 178 fields in R&D, 159 journals have the highest impact factor in their relevant fields. In 2022, there are 54002 papers published by these journals. Among them, 16349, or 30.3%, are from Chinese scientists, surpassing the US for the first time.

On the 371 journals that are considered the top 10% by number of citations, impact factor and number of papers published annually, China remains the number one origin of authors. Chinese scientists as the lead authors published 93.6 thousands papers on these journals out of the 348.6 thousands in total.

In 2022, total 28.4 thousand papers were published on the 16 most prestiges journals that have impact factors above 30 and more than 100 thousand citations. Chinese scientists published 1140 of them, a second in the world, at the same position as in 2021.

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据央视新闻报道,中国科学技术信息研究所今日发布中国科技论文统计报告。

报告中提到,我国各学科最具影响力期刊论文数量首次排在世界第1位,高水平国际期刊论文数量及被引用次数均排在世界第1位。

各学科影响因子最高的期刊可以被看作是世界各学科最具影响力期刊。

2022年178个学科中高影响力期刊共有159种,2022年各学科最具影响力期刊上的论文总数为54002篇。

中国在这些期刊上发表的论文数为16349篇,占世界总量的30.3%,首次超过美国排在世界第1位。

将各学科影响因子和总被引用次数同居本学科前10%,且每年刊载的学术论文及述评文章数大于50篇的期刊,遴选为世界各学科代表性科技期刊,在其上发表的论文属于高水平国际期刊论文。

2022年共有371种国际科技期刊入选世界各学科代表性科技期刊,发表高水平国际期刊论文34.86万篇。

按第一作者第一单位统计分析结果显示,中国发表高水平国际期刊论文9.36万篇,占世界总量的26.9%,被引用次数为64.96万次,论文发表数量和被引用次数均排在世界第一位。

2022年被引用次数超过10万次且影响因子超过30的国际期刊有16种,2022年共发表论文2.84万篇。

其中,中国发表1140篇学术论文和述评文章,排在世界第2位,与2021年持平。
 

taxiya

Brigadier
Registered Member
Super battery - a byproduct of China's EV battery industry?

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The author is 标题党, creating sensation by exagerating. An equal question can be asked "Can a LFP Li production line build ternary Li battery?" Same answer, no. The chemicals are different, therefor not a byproduct of EV industry.

It does share expertise with EV battery research in the fundamentals.

I searched through website of Journal of Naval Engineering, could not find the mentioned article. I wonder how could the author get hold of the content and made up his article.

However I found the abstract of the paper here
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. It is called 超级电容电池 (super capacitor battery). According to the abstract it's still "fundamentally" a battery (not exactly), but having performance of super capacitor. It is the usage of the word "fundamentally" makes me think that it is far from a conventional EV battery. It is because of this, I think the SCMP author is 脑补 his article without knowing what he is talking about.

Now the positive part. The "battery" has 100C-300C (fast discharge). It has been used as battery for starting motor for heavy duty ICE.
 

SanWenYu

Captain
Registered Member
A joined team of Northeastern University and CAS developed a new material that sets a new record in solar steam generation.

"By incorporating them into three-dimensional porous hydrogel-based evaporators with a conical cavity, an unprecedentedly high evaporation rate of roughly 6.09 kilograms per square metre per hour is achieved for 3.5 weight percent saline water under 1 sun of irradiation without salt precipitation."

Their trial system placed outdoor in Shenyang produced 23 litres of fresh water per sq meter per day in average.

Paper:
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Abstract​

Solar steam interfacial evaporation represents a promising strategy for seawater desalination and wastewater purification owing to its environmentally friendly character
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. To improve the solar-to-steam generation, most previous efforts have focused on effectively harvesting solar energy over the full solar spectrum
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. However, the importance of tuning joint densities of states in enhancing solar absorption of photothermal materials is less emphasized. Here we propose a route to greatly elevate joint densities of states by introducing a flat-band electronic structure. Our study reveals that metallic λ-Ti3O5 powders show a high solar absorptivity of 96.4% due to Ti–Ti dimer-induced flat bands around the Fermi level. By incorporating them into three-dimensional porous hydrogel-based evaporators with a conical cavity, an unprecedentedly high evaporation rate of roughly 6.09 kilograms per square metre per hour is achieved for 3.5 weight percent saline water under 1 sun of irradiation without salt precipitation. Fundamentally, the Ti–Ti dimers and U-shaped groove structure exposed on the λ-Ti3O5 surface facilitate the dissociation of adsorbed water molecules and benefit the interfacial water evaporation in the form of small clusters. The present work highlights the crucial roles of Ti–Ti dimer-induced flat bands in enchaining solar absorption and peculiar U-shaped grooves in promoting water dissociation, offering insights into access to cost-effective solar-to-steam generation.


News story:
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9月13日,Nature在线发表了东北大学左良教授团队、秦高梧教授团队与中国科学院金属研究所陈星秋研究员团队的合作研究结果,论文题目为“Flatband λ-Ti3O5 towards extraordinary solar steam generation”。该论文第一作者为东北大学材料科学与工程学院/材料各向异性与织构教育部重点实验室杨波副教授,通讯作者为左良教授。

受人口增长、环境污染以及气候变化等因素的影响,淡水资源短缺问题日益严峻。根据全球水资源经济委员会最新研究报告,到2030年全球淡水供应短缺将达到40%。鉴于70%以上的地球表面被海洋覆盖,海水淡化无疑是破解这一急迫问题的最有效策略。近年来,科研人员致力探索基于光热转换效应的太阳能驱动界面水蒸发技术,其在减轻化石能源消耗与环境污染压力、保障清洁水资源安全供给方面有着广阔的应用前景。

获取具有宽吸收谱、高吸收率的光热转换材料,是将太阳能高效转换为热能需要解决的首要问题。该研究从光与物质相互作用的本质出发,通过第一性原理计算和实验研究发现,亚氧化钛(TinO2n-1)中存在的Ti-Ti二聚体结构导致Ti-3d电子在实空间的局域化,并在费米能级附近引入平带电子态,从而增强电子跃迁的联合态密度。如图1所示,金属性λ-Ti3O5在费米能级附近较宽的能量范围存在源于Ti-3d轨道的多重平带电子态,使得其在全太阳光谱范围内呈现出96.4%的吸光率。


基于上述理解,将光热转换材料λ-Ti3O5与聚乙烯醇(PVA)混合,制作出了三维多孔连通结构的蒸发器,在1个太阳光照条件下(1 kW m-2)获得了高达6.09 kg m-2 h-1的水蒸发速率,创造了长时间工作且无盐分析出的太阳能驱动光热水蒸发速率的新纪录(图3a,b)。进一步设计了户外海水淡化和淡水收集装置,置于东北大学南湖校区户外自然光照时的平均日收集淡水量达到23 L m-2 day-1(图3c-e),展现出了良好的应用前景。
 

broadsword

Brigadier
that imposes huge costs on them AND they'll have to do it with much less revenue.

True, and Chinese companies could take their advantage by offering both versions. If the best Bluetooth is the current one, they could earn bigger profits as most will opt for Nearlink. It takes 10ms to feel a sharp pain and 13ms to see an image, so 1/30ms is how mindboggling Nearlink is.
 

BlackWindMnt

Captain
Registered Member
True, and Chinese companies could take their advantage by offering both versions. If the best Bluetooth is the current one, they could earn bigger profits as most will opt for Nearlink. It takes 10ms to feel a sharp pain and 13ms to see an image, so 1/30ms is how mindboggling Nearlink is.
It would also make it harder for those brands to enter the chinese market, hell maybe even the BRICS market zone.
 
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