scholarly journals Corrigendum to “An improved method to estimate actual vapor pressure without relative humidity data” Agricultural and Forest Meteorology, volume 298-299, (2021), 108306

2021 ◽  
pp. 108505
Author(s):  
Rangjian Qiu ◽  
Longan Li ◽  
Shaozhong Kang ◽  
Chunwei Liu ◽  
Zhenchang Wang ◽  
...  
Keyword(s):  
Relative Humidity ◽  
Vapor Pressure ◽  
Improved Method ◽  
Forest Meteorology ◽  
Relative Humidity Data

An improved method to estimate actual vapor pressure without relative humidity data

2021 ◽  
Vol 298-299 ◽  
pp. 108306 ◽  
Author(s):  
Rangjian Qiu ◽  
Longan Li ◽  
Shaozhong Kang ◽  
Chunwei Liu ◽  
Zhenchang Wang ◽  
...  
Keyword(s):  
Relative Humidity ◽  
Vapor Pressure ◽  
Improved Method ◽  
Relative Humidity Data

scholarly journals Human Thermal Comfort Situation in the Goller (Lakes) District of Turkey

2016 ◽  
pp. 137-144
Author(s):  
Yuksel Guclu
Keyword(s):  
Relative Humidity ◽  
Thermal Comfort ◽  
Human Health ◽  
Air Temperature ◽  
Mediterranean Region ◽  
Human Thermal Comfort ◽  
Almost All ◽  
Relative Humidity Data ◽  
Recreation Activities

Abstract In this study, the determination of the human thermal comfort situation in the Goller District (in the Mediterranean Region) of Turkey has been aimed. In the direction of the aim, the air temperature and relative humidity data of total 11 meteorology stations have been examined according to The Thermo-hygrometric Index (THI) and the New Summer Simmer Index (SSI). According to this, it has been determined that the thermal comfort conditions are not appropriate in the period of October-May on average monthly. The months of June and September are the most appropriate to almost all kinds of tourism and recreation activities in the outdoor in terms of thermal comfort. When THI and SSI indices’ values are evaluated together, the periods between 5th – 25th June and 29th August-16th September are the most appropriate periods in the study area on average in terms of the thermal comfort for the tourism and recreation activities in the outdoor. Keywords: Thermal comfort, human health, The Thermo-Hygrometric Index, The Summer Simmer Index, Goller District, Turkey.

scholarly journals An improved method to validate the relative humidity generation in sorption balances

2009 ◽  
Vol 72 (1) ◽  
pp. 99-104 ◽  
Author(s):  
Lars Wadsö ◽  
Anders Anderberg ◽  
Ingrid Åslund ◽  
Olle Söderman
Keyword(s):  
Relative Humidity ◽  
Improved Method

scholarly journals Water Vapor Pressure Deficit in Portugal and Implications for the Development of the Invasive African Citrus Psyllid Trioza erytreae

Insects ◽  
2020 ◽  
Vol 11 (4) ◽  
pp. 229 ◽  
Author(s):  
Paulo Eduardo Branco Paiva ◽  
Tânia Cota ◽  
Luís Neto ◽  
Celestino Soares ◽  
José Carlos Tomás ◽  
...  
Keyword(s):  
Water Vapor ◽  
Relative Humidity ◽  
Vapor Pressure ◽  
Vapor Pressure Deficit ◽  
Water Vapor Pressure ◽  
Control Measures ◽  
Effective Control ◽  
First Instar ◽  
Trioza Erytreae ◽  
Water Vapor Pressure Deficit

African citrus psyllid (Trioza erytreae (Del Guercio)) is a vector insect of the bacterium Candidatus Liberibacter africanus, the putative causal agent of Huanglongbing, the most devastating citrus disease in the world. The insect was found on the island of Madeira in 1994 and in mainland Portugal in 2015. Present in the north and center of the country, it is a threat to Algarve, the main citrus-producing region. Trioza erytreae eggs and first instar nymphs are sensitive to the combination of high temperatures and low relative humidity. Daily maximum air temperature and minimum relative humidity data from 18 weather stations were used to calculate the water vapor pressure deficit (vpd) from 2004 to 2018 at various locations. Based on the mean vpd and the number of unfavorable days (vpd < 34.5 and vpd < 56 mbar) of two time periods (February to May and June to September), less favorable zones for T. erytreae were identified. The zones with thermal and water conditions like those observed in the Castelo Branco and Portalegre (Center), Beja (Alentejo), Alte, and Norinha (Algarve) stations showed climatic restrictions to the development of eggs and first instar nymphs of African citrus psyllid. Effective control measures, such as the introduction and mass release of Tamarixia dryi (Waterson), a specific parasitoid, and chemical control are necessary in favorable periods for T. erytreae development, such as in spring and in areas with limited or no climate restrictions.

Diffusion of water vapor through small areas of human skin in normal environment

1959 ◽  
Vol 14 (2) ◽  
pp. 269-275 ◽  
Author(s):  
Konrad J. K. Buettner
Keyword(s):  
Water Vapor ◽  
Relative Humidity ◽  
Vapor Pressure ◽  
Skin Temperature ◽  
Horny Layer ◽  
Small Areas ◽  
Vapor Transfer ◽  
Normal Environment ◽  
Made In ◽  
Frequency Curves

Four small skin areas of the forearm were exposed concurrently to four small bottles at skin temperature. The bottles contained certain wet salts which condition the local vapor pressure. The vapor transfer between skin and bottles resulted in a measurable weight change of the bottles. One thousand tests on 250 people were made in a comfortable room. Below a critical humidity, vapor left the skin; above this ‘neutral relative humidity’ (NRH) the skin gained vapor. A small portion of this skin intake is used to moisten the horny layer. Correcting for this, the average of all tests is NRH = 86%. Frequency curves show two significant maxima besides that around 86%, viz. one around a NRH of 60–70%, generally concurrent with edema, and one above 90% NRH, usually observed on sweating skin. Length of exposure (30 min.-8 hr.), season and skin temperature (excluding sweating) have no recognizable influence on NRH. Submitted on August 25, 1958

scholarly journals THE MECHANISM OF AERIAL DISINFECTION BY GLYCOLS AND OTHER CHEMICAL AGENTS

1947 ◽  
Vol 85 (6) ◽  
pp. 741-757 ◽  
Author(s):  
Theodore T. Puck
Keyword(s):  
Relative Humidity ◽  
Vapor Pressure ◽  
Vapor Concentration ◽  
Direct Function ◽  
Temperature Changes ◽  
Chemical Agents ◽  
Killing Action ◽  
High Degree ◽  
Bactericidal Efficiency

The effectiveness of any compound as an aerial germicide depends upon the extent of condensation of its vapor on air-suspended bacteria, and on the rate at which the resulting concentration of germicide can produce death of the microorganisms. The properties of any compound conducive to production of the highest rate of kill of air-borne microorganisms by means of the smallest possible concentration of germicide vapor, are as folows: (a) a low vapor pressure, but not lower than 0.001 mm. Hg at 25°C.; (b) high hygroscopicity; (c) toxicity for bacterial metabolism—a high degree of potency is not necessary although the killing action will be more efficient the higher the antibacterial activity of the compound employed. For any compound the killing action is always a direct function of the concentration of its vapor in the air. The maximum amount of a hygroscopic substance which can exist in the vapor state decreases as the relative humidity increases. Hence, at high relative humidities the bactericidal efficiency is lowest. At lower relative humidities the air can contain more vapor, and hence a greater effect is possible. At any relative humidity, the killing action is greater, the more closely the germicide vapor concentration approaches the saturation point. The presence of soluble compounds in droplets containing bacteria promotes more extensive condensation of the germicide than would otherwise occur, and so enhances its effectiveness. In the absence of such soluble substances, low atmospheric humidities may cause complete desiccation of a bacterial particle. Under these conditions its surface may become resistant to the condensation of the vapor, and thus prevent effective germicidal action. The influence of temperature changes on the killing efficiency maybe correctly deduced from a consideration of the effect of a rise in temperature on the vapor pressure of the germicide and on the rate of its bactericidal action in vitro. Equations are presented for estimating quantitatively the magnitude of some of the effects discussed.

HYDROGEN EXCHANGE BETWEEN CELLULOSE AND WATER: I. MEASUREMENT OF ACCESSIBILITY

1961 ◽  
Vol 39 (10) ◽  
pp. 1934-1943 ◽  
Author(s):  
O. Sepall ◽  
S. G. Mason
Keyword(s):  
Surface Roughness ◽  
Water Vapor ◽  
Relative Humidity ◽  
Heavy Water ◽  
Hydrogen Exchange ◽  
Amorphous Material ◽  
Tritiated Water ◽  
Improved Method ◽  
Amorphous Fraction ◽  
Good Agreement

Estimates of the extent of the hydrogen exchange reaction between cellulose and water vapor determined by an improved method using tritiated water and by the use of heavy water were usually in good agreement. With certain samples, surface roughness had a small effect upon the measurement of tritium radioactivity in cellulose.The accessibility or limiting extent of the exchange increased slightly with relative humidity in the range 20 to 100% and was attributed to the reduction of crystalline order reported recently in similar experiments.In contrast to cellulose whose accessibility corresponds approximately to the amorphous fraction, a partially crystalline amylose was 100% accessible while an amorphous xylan was 52% accessible, indicating that in these substances the accessibility and the fraction of amorphous material are not identical.

scholarly journals An Improved Method for Storing Yam (Dioscorea alata)

1969 ◽  
Vol 58 (4) ◽  
pp. 456-465
Author(s):  
J. R. Rivera ◽  
M. A. González ◽  
A. Collazo de Rivera ◽  
J. Cuevas-Ruiz
Keyword(s):  
Relative Humidity ◽  
Gamma Radiation ◽  
Storage Time ◽  
Practical Method ◽  
Dioscorea Alata ◽  
Improved Method ◽  
Ambient Conditions ◽  
Dormancy Period ◽  
Controlled Conditions ◽  
Significant Chemical

By storing cured yam tubers of the variety "Florido" (D. alata) at a temperature of 16° C and a relative humidity of 80 percent their dormancy period can be extended 4 additional months. No significant chemical changes are observed during the storage time. Their flavor remains unchanged and they lose very little weight. When yam tubers stored for 7 months under controlled conditions are treated with the sprout inhibitor CIPC in Dinafog form, their inactivity period is prolonged for 20 additional days. This sprout inhibitor could be used as a good and practical method to increase the transit period of the tubers if and when its use is authorized. The effects of gamma radiation in yam tubers stored for 7 months under controlled conditions were also studied. Irradiation doses of 7.5 and 10 Krad controlled their sprouting process satisfactorily. No change was observed in flavor. Treatments with 7.5 and 10 Krad doses extend the dormancy period of the tubers kept at prevailing ambient conditions for 60 additional days, thus extending the yam shelf life.

scholarly journals PERBANDINGAN PENGUKURAN RADIOMETER DAN RADIOSONDE PADA MUSIM HUJAN DI DRAMAGA BOGOR

2016 ◽  
Vol 17 (2) ◽  
pp. 75
Author(s):  
Ibnu Athoillah ◽  
Saraswati Dewi ◽  
Findy Renggono
Keyword(s):  
Relative Humidity ◽  
Rainy Season ◽  
Lower Layer ◽  
Temperature Data ◽  
Good Match ◽  
Weather Modification ◽  
Comparison Result ◽  
Intensive Observation ◽  
Relative Humidity Data ◽  
Observation Period

IntisariBalai Besar Teknologi Modifikasi Cuaca (BB-TMC) BPPT bekerjasama dengan Badan Meteorologi Klimatologi dan Geofisika (BMKG) melakukan kegiatan Intensive Observation Period (IOP) selama puncak musim hujan pada tanggal 18 Januari - 16 Februari 2016 di wilayah Jabodetabek. Salah satu peralatan yang digunakan untuk observasi adalah Radiometer dan Radiosonde. Pada penelitian ini akan difokuskan bagaimana perbandingan hasil dari pengukuran Radiometer dan Radiosonde selama kegiatan IOP terutama untuk parameter temperatur dan kelembapan relatif. Hasil dari perbandingan pada profil atmosfer di lapisan tertentu terlihat adanya data yang mempunyai kecenderungan jauh dan tidak memiliki kedekatan nilai. Untuk pengukuran temperatur dengan radiometer jika dibandingkan dengan radiosonde, korelasi data semakin kecil di lapisan atas, sebaliknya jika untuk pengukuran kelembapan relatif, korelasi data di lapisan atas lebih tinggi daripada korelasi data di lapisan bawah. Sedangkan jika dibandingkan pada satu waktu antara radiometer dan radiosonde menunjukkan kecocokan untuk kedua data, meskipun kecocokan data kelembapan relatif lebih kecil dibandingkan data temperatur.  AbstractNational Laboratory for Weather Modification (BB-TMC) BPPT has colaborated with Meteorological Climatology and Geophysic Agency (BMKG) in conducting Intensive Observation Period (IOP) during the peak of rainy season in Jabodetabek area on January 18th- February 16th 2016. One of the tools used in the observation is Radiometer and Radiosonde. This study will focus on comparison result between Radiometer and Radiosonde measurement during IOP especially for temperature and relative humidity parameters. The result in a particular layer of profile atmosphere indicates that the data  tends to deviate away. The temperature difference measured using radiometer and radiosonde in the upper layer shows smaller value than that in the lower layer.  In contrast,  the correlation for relative humidity data in the upper layers is higher than in the lower layers. Meanwhile when compared at one time indicate a good match for both data, although the data matches of  the relative humidity are lower than the temperature data.  

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